Patent Publication Number: US-2020284533-A1

Title: Distributor, heat exchanger unit and air conditioner

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based on and claims priority under 35 U. S. C. § 119 to Japanese Patent Application No. 2019-040907 filed on Mar. 6, 2019, Japanese Patent Application No. 2019-1708882 filed on Sep. 19, 2019, Japanese Patent Application No. 2019-170883 filed on Sep. 19, 2019, Japanese Patent Application No. 2020-001877 filed on Jan. 9, 2020, and Korean Patent Application No. 10-2020-0020791 filed on Feb. 20, 2020, the disclosures of which are incorporated herein by reference in their entirety. 
     BACKGROUND 
     1. Field 
     The disclosure relates to a distributor, a heat exchanger, and an air conditioner. 
     2. Discussion of Related Art 
     A distributor having a main pipe installed in the upstream of the main body of the distributor through which a fluid flows and a plurality of outflow pipes installed in the downstream is known, where the main pipe includes a distributor installed at an inlet through which a fluid flows in, an inner pipe linked to the distributor, partition members to form as many distribution paths as the number of the outflow pipes, and an outer pipe enclosing the inner pipe and forming a reservoir linked to each distribution path in the inner pipe, and each outflow pipe is linked to a reservoir corresponding to the main pipe (for example, see Patent Literature 1). 
     A refrigerant distributor for distributing a refrigerant to a plurality of refrigerant paths is known, where a distributor main body is defined by a vertically long barrel-shaped member having a refrigerant inlet coupled to a refrigerant pipe and an opposite refrigerant outlet and a plurality of distributor paths from the refrigerant inlet to the refrigerant outlet are partitioned and formed in the distributor main body (for example, see Patent Literature 2). 
     (Patent Literature 1) JP2730299 B2 
     (Patent Literature 2) JP1992-302964 A 
     SUMMARY 
     When a distributor is formed to have a plurality of branched pipes each linked to one of the plurality of distribution paths connected to a portion between neighboring partitions of the main pipe, the distributor may not be compact with an increase in the number of branched pipes. 
     When a distributor is formed to have a single branched pipe connected to each of the plurality of distribution paths defined in the main pipe, an increase in the number of branched pipes may lead to an increase in the number of distribution paths, which may fail to make the distributor compact. 
     As for a distributor having a plurality of reservoirs enclosing a plurality of distribution paths and linked to the plurality of distribution paths, when a structure in which each of the plurality of branched pipes is connected to a reservoir is employed, fluids flowing into the plurality of distribution paths may be unequally distributed, which may worsen flow distribution characteristics. 
     As for a distributor manufactured by inserting a plurality of partitions in the distributor main body, when a structure in which the distributor main body and the plurality of partition members are joined intact is employed, a fluid leak may occur between the outer pipe and the plurality of partitions or between an inner shaft and the plurality of partitions, which may worsen flow distribution characteristics. 
     An objective of the disclosure is to keep a distributor compact even when the number of branched pipes to be connected to a main pipe is increased. 
     Another objective of the disclosure is to reduce the possibility of worsening fluid distribution characteristics when fluids flowing into a plurality of distribution paths are not equally distributed. 
     Yet another objective of the disclosure is to reduce the possibility of worsening fluid distribution characteristics due to occurrence of a fluid leak between the outer pipe and the plurality of partitions or between the inner shaft and the plurality of partitions. 
     According to an aspect of the disclosure, a distributor includes a barrel-like main pipe; a plurality of partitions installed along the shaft of the main pipe to define a plurality of distribution paths in the main pipe; and a plurality of branched pipes each connected to one of the plurality of distribution paths, wherein first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths with at least one of the plurality of partitions in between them. 
     The first and second branched pipes may be neighboring branched pipes, and the first and second distribution paths may have at least one of the plurality of partitions in between them. 
     The plurality of branched pipes may include at least two branched pipes connected to one of the plurality of distribution paths. In this case, the at least two branched pipes may be formed such that at least one of inner diameter of an axial part and insertion length to one distribution path differs among the at least two branched pipes. The plurality of partitions may be installed to form a certain twisted angle to the shaft of the main pipe. 
     The distributor may further include an orifice plate with a plurality of orifice holes corresponding to the plurality of distribution paths, and the plurality of orifice holes may have different inner diameter. In this case, the distributor may further include a position fitting tool for fitting the plurality of distribution paths into the plurality of orifice holes. 
     The plurality of partitions may form the plurality of distribution paths such that cross-sectional areas at a particular cutting plane of the plurality of distribution paths may differ. 
     The distributor may include two distributor elements, each of which may include a main pipe; a plurality of partitions; and a plurality of branched pipes, wherein first and second branched pipes of the plurality of branched pipes may be connected to first and second distribution paths of the plurality of distribution paths with at least one of the plurality of partitions in between them. 
     According to another aspect of the disclosure, a distributor includes a barrel-like main pipe; a plurality of partitions installed integrally with the main pipe along the shaft of the main pipe to define a plurality of distribution paths in the main pipe; and a plurality of branched pipes each connected to one of the plurality of distribution paths, wherein the plurality of branched pipes may include at least two branched pipes connected to one of the plurality of distribution paths. 
     The first and second branched pipes of the plurality of branched pipes may be connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having at least one of the plurality of partitions in between them. In this case, the first and second branched pipes may be neighboring branched pipes, and the first and second distribution paths may have at least one of the plurality of partitions in between them. 
     The at least two branched pipes may be formed such that at least one of inner diameter of an axial part and insertion length to one distribution path differs among the at least two branched pipes. 
     The plurality of partitions may be installed to form a certain twisted angle to the shaft of the main pipe. 
     The distributor may include an orifice plate with a plurality of orifice holes corresponding to the plurality of distribution paths, and the orifice plate may include a plurality of projections to be inserted to the plurality of distribution paths, respectively. In this case, a brazing sheet may be provided between the main pipe and the orifice plate. 
     The distributor may include a cap at an end of the main pipe to seal off all the plurality of distribution paths, and the cap may include a plurality of projections to be inserted to the plurality of distribution paths, respectively. In this case, a brazing sheet may be provided between the main pipe and the cap. 
     The distributor may include at least one cover on the outer circumference of the main pipe, and the at least one cover may include a plurality of burring holes to which the plurality of branched pipes are inserted. 
     The main pipe may include a plurality of burring holes to which the plurality of branched pipes are inserted. 
     According to another aspect of the disclosure, a distributor includes a barrel-like main pipe; a plurality of partitions installed along the shaft of the main pipe to define a plurality of distribution paths in the main pipe; and a plurality of branched pipes each connected to one of the plurality of distribution paths, wherein the plurality of partitions may be two neighboring partitions, each of which may include at least one step to support one of the plurality of branched pipes connected to a distribution path defined by the two partitions. 
     The first and second branched pipes of the plurality of branched pipes may be connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having at least one of the plurality of partitions in between them. In this case, the first and second branched pipes may be neighboring branched pipes, and the first and second distribution paths may have at least one of the plurality of partitions in between them. 
     The plurality of branched pipes may include at least two branched pipes connected to one distribution path. In this case, each of the two partitions may have a plurality of steps, and at least two branched pipes are supported by different ones of the plurality of steps, making at least one of the inner diameter of an axial part or insertion length into the distribution path differs among the branched pipes. The plurality of partitions may be installed to form a certain twisted angle to the shaft of the main pipe. 
     Each of the two partitions may have a particular step at a shallow position not deeper than half of the depth of the distribution path among the at least one step, and a branched pipe connected to a distribution path may be supported by the particular step, making insertion length to the distribution path shorter than half of the depth. 
     The main pipe and a member including the plurality of partitions may be bonded by shrinking the main pipe and expanding the member. 
     Each of the plurality of partitions may include a crushed lib at the front, which is crumpled and modified by contact with the main pipe. 
     According to another aspect of the disclosure, a distributor includes a barrel-shaped outer pipe; an inner shaft installed in the outer pipe; a plurality of partitions defining a plurality of distribution paths between the outer pipe and the inner shaft; and a plurality of branched pipes each connected to one of the plurality of distribution paths, wherein the plurality of partitions are installed integrally with the inner shaft, or installed integrally with a member bonded to the outer pipe with a substance different from the partition and the outer pipe or the outer pipe, or installed integrally with a member bonded to the inner shaft with a substance different from the partition and the inner shaft. 
     The distributor may be formed such that at a first location of an open end of the outer pipe, convex portion may be formed in the plurality of distribution paths and concave portions may be formed on the outer surface. In this case, the distributor may include an orifice plate at a second location other than the end of the outer part. 
     The distributor may include an orifice plate at a first location at an open end of the outer pipe, and may be formed such that at a second location other than the end of the outer pipe, convex portion may be formed in the plurality of distribution paths and concave portions may be formed on the outer surface. 
     The plurality of partitions may be installed to form a certain twisted angle to the shaft of the outer pipe. In this case, the plurality of partitions may be installed to form a first twisted angle to the shaft of the outer pipe in a first range in the axial direction of the outer pipe and form a second twisted angle to the shaft of the outer pipe in a second range in the axial direction of the outer pipe. 
     The plurality of partitions may not be rib-processed on their surfaces in a first range in the axial direction of the outer pipe and may be rib-processed on their surfaces in a second range in the axial direction of the pipe. 
     The plurality of partitions have first thickness at a first location in the axial direction of the outer pipe, and second thickness at a second location in the axial direction of the outer pipe. 
     The plurality of branched pipes may include at least two branched pipes connected to one of the plurality of distribution paths. In this case, the at least two branched pipes may have different diameter of holes formed on a side of a portion inserted to a distribution path. 
     According to an aspect of the disclosure, a heat exchanger unit includes a distributor distributing a fluid passing inside; and a heat exchanger performing heat exchange between the fluid distributed by the distributor and air, wherein the distributor includes a barrel-like main pipe; a plurality of partitions installed along the shaft of the main pipe to define a plurality of distribution paths in the main pipe; and a plurality of branched pipes each connected to one of the plurality of distribution paths, wherein first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths with at least one of the plurality of partitions in between them. 
     The distributor may be shorter than length across which a plurality of fluid pipes in which the fluid distributed by the distributor flows are arranged in parallel. 
     The plurality of branched pipes may include at least two branched pipes connected to one of the plurality of distribution paths. In this case, the at least two branched pipes may be formed such that at least one of inner diameter of an axial part and insertion length to one distribution path differs among the at least two branched pipes. At least two branched pipes may be arranged such that inner diameter of an axial part of a branched pipe, through which a fluid distributed for a fast air flow portion of the heat exchanger passes is greater than the inner diameter of the axial part of a branched pipe, through which a fluid distributed for a slow air flow portion of the heat exchanger passes, and insertion length of a branched pipe to the distribution path, through which the fluid distributed for a fast air flow portion of the heat exchanger passes, is shorter than the insertion length of a branched pipe to the distribution path, through which the fluid distributed for a slow air flow portion of the heat exchanger passes. 
     According to another aspect of the disclosure, a heat exchanger unit includes a distributor distributing a fluid passing inside; and a heat exchanger performing heat exchange between the fluid flowing in a plurality of fluid pipes and air, wherein the distributor includes a barrel-like main pipe; a plurality of partitions installed integrally with the main pipe along the shaft of the main pipe to define a plurality of distribution paths in the main pipe; and a plurality of branched pipes each connected to one of the plurality of distribution paths, wherein the plurality of branched pipes includes at least two branched pipes connected to one of the plurality of distribution paths. 
     According to another aspect of the disclosure, a heat exchanger unit includes a distributor distributing a fluid passing inside; and a heat exchanger performing heat exchange between the fluid flowing in a plurality of fluid pipes and air, wherein the distributor includes a barrel-like main pipe; a plurality of partitions installed along the shaft of the main pipe to define a plurality of distribution paths in the main pipe; and a plurality of branched pipes each connected to one of the plurality of distribution paths and one of the plurality of fluid pipes, wherein the plurality of partitions are two neighboring partitions, each of which includes at least one step supporting one of the plurality of branched pipes connected to a distribution path defined by the two partitions. 
     The plurality of branched pipes may include at least two branched pipes connected to one distribution path. In this case, each of the two partitions may have a plurality of steps, and at least two branched pipes are supported by different ones of the plurality of steps, making at least one of the inner diameter of an axial part or insertion length into the distribution path differs among the branched pipes. 
     Each of the two partitions may have a particular step at a shallow position not deeper than half of the depth of the distribution path among the at least one step, and a branched pipe connected to a distribution path may be supported by the particular step, making insertion length to the distribution path shorter than half of the depth. 
     At least one of the plurality of branched pipes may be branched into a plurality of branched pipes, each of which may be connected to one of the plurality of fluid pipes. 
     According to another aspect of the disclosure, a heat exchanger unit includes a distributor distributing a fluid passing inside; and a heat exchanger performing heat exchange between the fluid flowing in a plurality of fluid pipes and air, wherein the distributor includes a barrel-like outer pipe; an inner shaft installed in the outer pipe; a plurality of partitions installed between the outer pipe and the inner shaft to define a plurality of distribution paths; and a plurality of branched pipes each connected to one of the plurality of distribution paths, and wherein the plurality of partitions may be installed integrally with the inner shaft, or installed integrally with a member bonded to the outer pipe with a substance different from the partition and the outer pipe or with the outer pipe, or installed integrally with a member bonded to the inner shaft with a substance different from the partition and the inner shaft. 
     Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like; and the term “controller” means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. 
     Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts: 
         FIG. 1  illustrates an air conditioner, according to an embodiment of the disclosure; 
         FIG. 2  illustrates an overall structure of a distributor, according to a first embodiment of the disclosure; 
         FIG. 3  illustrates an A-A cross-sectional view of the distributor of  FIG. 2 ; 
         FIG. 4  illustrates a first modification to the A-A cross-sectional view of the distributor of  FIG. 2 ; 
         FIG. 5A  illustrates a second modification to the A-A cross-sectional view of the distributor of  FIG. 2 ; 
         FIG. 5B  illustrates a second modification to the A-A cross-sectional view of the distributor of  FIG. 2 ; 
         FIG. 5C  illustrates a second modification to the A-A cross-sectional view of the distributor of  FIG. 2 ; 
         FIG. 6  illustrates relations for each branched pipe in a heat exchanger between wind velocity at the height of a refrigerant pipe connected to the branched pipe and a refrigerant flow rate suitable to flow into the branched pipe; 
         FIG. 7  illustrates an overall structure of a distributor, according to a second embodiment of the disclosure; 
         FIG. 8  illustrates a partially enlarged view of the distributor, according to the second embodiment of the disclosure; 
         FIG. 9  illustrates a partially enlarged view of a distributor, according to a third embodiment of the disclosure; 
         FIG. 10  illustrates an A-A cross-sectional view of a distributor, according to a fourth embodiment of the disclosure; 
         FIG. 11  illustrates a perspective view of a distributor, according to a fifth embodiment of the disclosure; 
         FIG. 12  illustrates an overall structure of a heat exchange unit including a distributor and a heat exchanger, according to a sixth embodiment of the disclosure; 
         FIG. 13  illustrates a partially enlarged view of a distributor, according to a seventh embodiment of the disclosure; 
         FIG. 14  illustrates an overall structure of a distributor, according to an eighth embodiment of the disclosure; 
         FIG. 15  illustrates an A-A cross-sectional view of the distributor of  FIG. 14 ; 
         FIG. 16  illustrates an overall structure of a distributor, according to a ninth embodiment of the disclosure; 
         FIG. 17  illustrates a partially enlarged view of a distributor, according to a tenth embodiment of the disclosure; 
         FIG. 18  illustrates a partially enlarged view of a distributor, according to an eleventh embodiment of the disclosure; 
         FIG. 19  illustrates a perspective view of an exterior cover, according to a twelfth embodiment of the present disclosure; 
         FIG. 20  illustrates a partially enlarged view of a distributor, according to the twelfth embodiment of the disclosure; 
         FIG. 21  illustrates an overall structure of a heat exchange unit including a distributor and a heat exchanger, according to a thirteenth embodiment of the disclosure; 
         FIG. 22  illustrates an overall structure of a distributor, according to a fourteenth embodiment of the disclosure; 
         FIG. 23  illustrates an A-A cross-sectional view of the distributor of  FIG. 22 ; 
         FIG. 24  illustrates an A-A cross-sectional view of the distributor of  FIG. 22 ; 
         FIG. 25  illustrates an A-A cross-sectional view of the distributor of  FIG. 22 ; 
         FIG. 26  illustrates a graph representing a reason why it is desirable to have insertion length of a branched pipe be less than half the depth of a distribution path; 
         FIG. 27  illustrates an A-A cross-sectional view the distributor of  FIG. 22 ; 
         FIG. 28  illustrates an overall structure of a distributor, according to a fifteenth embodiment of the disclosure; 
         FIG. 29  illustrates a partially enlarged view of a distributor, according to a sixteenth embodiment of the disclosure; 
         FIG. 30  illustrates a partially enlarged view of a distributor, according to a seventeenth embodiment of the disclosure; 
         FIG. 31  illustrates an overall structure of a heat exchange unit including a distributor and a heat exchanger, according to an eighteenth embodiment of the disclosure; 
         FIG. 32  illustrates an overall structure of a distributor, according to a nineteenth embodiment of the disclosure; 
         FIG. 33A  illustrates a first example of the distributor of  FIG. 32 ; 
         FIG. 33B  illustrates a first example of the distributor of  FIG. 32 ; 
         FIG. 34A  illustrates a second example of the distributor of  FIG. 32 ; 
         FIG. 34B  illustrates a second example of the distributor of  FIG. 32 ; 
         FIG. 35  illustrates an overall structure of a distributor, according to a twentieth embodiment of the disclosure; 
         FIG. 36A  illustrates a cross-sectional view of a distributor, according to a twenty first embodiment of the disclosure; 
         FIG. 36B  illustrates a cross-sectional view of a distributor, according to a twenty first embodiment of the disclosure; 
         FIG. 37  illustrates an overall structure of a distributor, according to a twenty second embodiment of the disclosure; 
         FIG. 38A  illustrates a partially enlarged view of the distributor, according to the twenty second embodiment of the disclosure; 
         FIG. 38B  illustrates a partially enlarged view of the distributor, according to the twenty second embodiment of the disclosure; 
         FIG. 39A  illustrates a cross-sectional view of a distributor, according to a twenty third embodiment of the disclosure; 
         FIG. 39B  illustrates a cross-sectional view of a distributor, according to a twenty third embodiment of the disclosure; 
         FIG. 40A  illustrates a cross-sectional view of a distributor, according to a twenty fourth embodiment of the disclosure; 
         FIG. 40B  illustrates a cross-sectional view of a distributor, according to a twenty fourth embodiment of the disclosure; 
         FIG. 41  illustrates an A-A cross-sectional view of a distributor, according to a twenty fifth embodiment of the disclosure; and 
         FIG. 42  illustrates an overall structure of a heat exchange unit including a distributor and a heat exchanger, according to a twenty sixth embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
       FIGS. 1 through 42 , discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device. 
     Referring to  FIG. 1 , an air conditioner  90  according to an embodiment of the disclosure may include an outdoor unit  91  and an indoor unit  92 . In the air conditioner  90 , the outdoor unit  91  and the indoor unit  92  may be connected to each other through a pipe provided to allow a refrigerant to flow in the pipe. 
     Although  FIG. 1  illustrates the single outdoor unit  91 , the outdoor unit  91  may be provided in the plural. The outdoor unit  91  may perform both the heat pump cycle and the heat recovery cycle. 
     Although  FIG. 1  illustrates the single indoor unit  92 , the indoor unit  92  may be provided in the plural. The indoor unit  92  may be driven in cooling mode or heating mode. 
     A heat exchange unit as will be described later may be provided in the outdoor unit  91  and/or the indoor unit  92 . 
       FIG. 2  illustrates an overall structure of a distributor  1 , according to a first embodiment of the disclosure. The distributor  1  is to distribute a refrigerant as an example of a fluid that passes in the distributor  1 . Furthermore, as shown in  FIG. 1 , the distributor  1  may include an outer pipe  10  in the form of a cylinder, an inner pipe  20  installed in the outer pipe  10 , and an orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Furthermore, the distributor  1  may include an inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, and a cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . The inlet  30  is installed outside the orifice plate  40 , so the orifice plate  40  is not visible from outside even though the orifice plate  40  is illustrated in  FIG. 2 . Moreover, the distributor  1  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     In  FIG. 2 , an internal structure of the inner pipe  20  is shown by removing the front of the outer pipe  10 . As shown in  FIG. 2 , a plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. In the first embodiment of the disclosure, the plurality of partition plates  21  are installed in parallel with a center shaft of the inner pipe  20 . In  FIG. 2 , as viewed from the front, of the plurality of partition plates  21 , partition plates  21   a  to  21   c  (ends of the partition plates  21   a  to  21   c  on the side of the outer pipe  10 , in particular) are shown, and of the plurality of distribution paths  22 , distribution paths  22   a  to  22   d  are shown. Although it is assumed herein that the plurality of partition plates  21  are installed in parallel with the center shaft of the inner pipe  20 , they may be installed along the shaft of the inner pipe  20 , in which case, the plurality of partition plates  21  are an example of a plurality of partitions installed along the shaft of the main pipe. 
     Furthermore, the orifice plate  40  may have a plurality of orifice holes  401  (see e.g.,  FIG. 9 ) through which to allow the refrigerant to flow into the plurality of distribution paths  22 . 
     The plurality of branched pipes  60  may be linked to the plurality of distribution paths  22 .  FIG. 2  shows the branched pipes  60   e  to  60   g  linked to distribution paths  22   e  to  22   g , respectively, in addition to the branched pipes  60   a  to  60   d  linked to the distribution paths  22   a  to  22   d , respectively. 
     This structure may be understood as an example of a structure in which neighboring first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   b  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   b  correspond to the first and second distribution paths and the partition plate  21   a  corresponds to the one of the plurality of partitions. 
     Furthermore, in this structure, the first and second branched pipes may not be adjacent to each other, and the first and second distribution paths may have at least one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   c  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   c  correspond to the first and second distribution paths and the partition plates  21   a  and  21   b  correspond to the at least one of the plurality of partitions. 
     Moreover, as shown in  FIG. 2 , in the first embodiment of the disclosure, the branched pipe  60   a  may extend to the right directly from the distribution path  22   a . The branched pipes  60   b  to  60   d  may extend forward from the distribution paths  22   b  to  22   d  first and then bend and extend to the right. The branched pipes  60   e  to  60   g  may extend to the opposite side from the distribution paths  22   e  to  22   g  first and then bend and extend to the right. 
     There may be one set of branched pipes  60   a  to  60   g , although in the first embodiment of the disclosure, there may be a multiple sets of branched pipes  60   a  to  60   g  installed in parallel. The structure as in the first embodiment of the disclosure may be understood as an example of a structure that includes at least two branched pipes connected to one of the plurality of distribution paths. 
       FIG. 3  illustrates an A-A cross-sectional view of the distributor  1  of  FIG. 2 . Referring to  FIG. 3 , the partition plates  21   a  to  21   g  may be installed in the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer side of the inner pipe  20  to the center portion of the inner pipe  20 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer side to the center portion of the inner pipe  20 . In  FIG. 3 , the branched pipe  60   a  linked and fixed to the distribution path  22   a  is inserted between the partition plates  21   a  and  21   g  that define the distribution path  22   a . Furthermore, in the first embodiment of the disclosure, inner diameter Di of an axial part  62   a  differs among the multiple branched pipes  60   a  (three branched pipes  60   a  in  FIG. 2 ). The axial part  62   a  may be a vena contracta portion  62   a . Moreover, in the first embodiment of the disclosure, insertion length L differs among the multiple branched pipes  60   a  (three branched pipes  60   a  in  FIG. 2 ). Although the branched pipe  60   a  linked to the distribution path  22   a  is shown because  FIG. 3  is an A-A cross-sectional view of the distributor  1  of  FIG. 2 , what are described above in connection with the branched pipe  60   a  may be equally applied to the other branched pipes  60   b  to  60   g  linked to the distribution paths  22   a  to  22   g . Accordingly, refrigerant flow resistance may be changed in the single distribution path  22  so that refrigerant flow distribution may be adjusted, thereby increasing heat exchange capability. 
     Next, a modification to the first embodiment of the disclosure will be described. 
       FIG. 4  illustrates a first modification to the A-A cross-sectional view of the distributor  1  of  FIG. 2 . While the axial part  62   a  of the branched pipe  60   a  has the shape that has an inclination from a main body  61   a  of the branched pipe  60   a  in  FIG. 3 , it may have the straight form with a step from the main body  61   a  as shown in  FIG. 4  to adjust flow of the refrigerant passage. 
     Furthermore, the insertion length L of the branched pipe  60   a  is adjusted by installing a beading part  63   a  in  FIGS. 3 and 4 , but is not be limited thereto. In a second modification, the insertion length L may be adjusted by outer diameter Do of the axial part  62   a . Specifically, the insertion length L of the branched pipe  60   a  may be determined by inserting the branched pipe  60   a  until the outer diameter Do of the axial part  62   a  fits the width between the partition plates  21   a  and  21   g.    
       FIGS. 5A to 5C  illustrate second modifications to the A-A cross-sectional view of the distributor  1  of  FIG. 2 . The cross-section of the distribution paths  22   a  to  22   g  may have the form of a trapezoid as shown in  FIG. 5A , a triangle as shown in  FIG. 5B , and a combination of trapezoid and rectangle as shown in  FIG. 5C . 
     Next, specific examples of the plurality of branched pipes  60  having different inner diameter Di of the axial part  62  and different insertion length L will be described.  FIG. 6  illustrates relations for each branched pipe  60  in a heat exchanger between wind velocity at the height of a refrigerant pipe connected to the branched pipe  60  and a refrigerant flow suitable to flow into the branched pipe  60 . Referring to  FIG. 6 , it may be seen that at a higher height, wind velocity increases, so more refrigerant flow may be desirable. For more refrigerant flow, the inner diameter Di of the axial part  62  may be increased and the insertion length L of the branched pipe  60  may be reduced. 
     In  FIG. 6 , for example, it is assumed that 6 branched pipes  60  are each linked to 7 distribution paths  22 , so that the refrigerant flows into a total of 42 branched pipes  60 . 
     In this case, when the refrigerant flows equally into the 7 distribution paths, among the  42  branched pipes  60 , one connected to a refrigerant pipe at a high height of the heat exchanger may have the axial part  62  with large inner diameter Di and have short insertion length L. 
     On the other hand, when the refrigerant flows unequally into the 7 distribution paths, among the  6  branched pipes  60  linked to each distribution path  22 , one connected to a refrigerant pipe at a higher height of the heat exchanger may have the axial part  62  with large inner diameter Di and have short insertion length L. 
     In this example, refrigerant pipes connected to the branched pipes  60  are arranged in parallel in the vertical direction of the heat exchanger, so the inner diameter of the axial part  62  and the insertion length L may differ depending on the location in the vertical direction of the heat exchanger, but it is not be limited thereto. 
     As for the inner diameter Di of the axial part  62 , the aforementioned structure may be understood as an example of a structure in which the inner diameter of the axial part of one of at least two branched pipes, through which a fluid distributed for a fast air flow portion of the heat exchanger passes is greater than the inner diameter of the axial part of the other branched pipe, through which a fluid distributed for a slow air flow portion of the heat exchanger passes. 
     Furthermore, as for the insertion length L of the branched pipe  60 , the aforementioned structure may be understood as an example of a structure in which the insertion length of one of at least two branched pipes to the distribution path, through which the fluid distributed for a fast air flow portion of the heat exchanger passes, is shorter than the insertion length of the other branched pipe to the distribution path, through which the fluid distributed for a slow air flow portion of the heat exchanger passes. 
     In the meantime, although both the inner diameter Di of the axial part  62  and the insertion length L differ among the plurality of branched pipes  60  in the first embodiment of the disclosure, it will not be limited thereto. At last one of the inner diameter of the axial part  62  or the insertion length L may differ among the plurality of branched pipes  60 . 
       FIG. 7  illustrates an overall structure of a distributor  2 , according to a second embodiment of the disclosure. The distributor  2  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  2 . Furthermore, as shown in  FIG. 7 , the distributor  2  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Furthermore, the distributor  2  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . The inlet  30  is installed outside the orifice plate  40 , so the orifice plate  40  is not visible from outside even though the orifice plate  40  is illustrated in  FIG. 7 . Moreover, the distributor  2  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     In  FIG. 7 , an internal structure of the inner pipe  20  is shown by removing the front of the outer pipe  10 . As shown in  FIG. 7 , a plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. In the second embodiment of the disclosure, the plurality of partition plates  21  are installed at a certain twisted angle to the center shaft of the inner pipe  20 . In  FIG. 7 , of the plurality of partition plates  21 , partition plates  21   a  to  21   g  (ends of the partition plates  21   a  to  21   g  on the side of the outer pipe  10 , in particular) are shown, and of the plurality of distribution paths  22 , distribution paths  22   a  to  22   g  are shown. Although it is assumed herein that the plurality of partition plates  21  are installed at a twisted angle to the center shaft of the inner pipe  20 , they may also be said as being installed along the shaft of the inner pipe  20 , in which case, the plurality of partition plates  21  are an example of a plurality of partitions installed along the shaft of the main pipe. 
     Furthermore, in  FIG. 7 , the orifice plate  40  may have the plurality of orifice holes  401  (see e.g.,  FIG. 9 ) through which to allow the refrigerant to flow into the plurality of distribution paths  22 . 
     The plurality of branched pipes  60  may be linked to the plurality of distribution paths  22 .  FIG. 7  shows the branched pipes  60   a  to  60   g  linked to the distribution paths  22   a  to  22   g , as the plurality of branched pipes  60 . 
     This structure may be understood as an example of a structure in which neighboring first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   b  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   b  correspond to the first and second distribution paths and the partition plate  21   a  corresponds to the one of the plurality of partitions. 
     Furthermore, in this structure, the first and second branched pipes may not be adjacent to each other, and the first and second distribution paths may have at least one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   c  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   c  correspond to the first and second distribution paths and the partition plates  21   a  and  21   b  correspond to the at least one of the plurality of partitions. 
     Moreover, as shown in  FIG. 7 , in the second embodiment of the disclosure, the distribution paths  22   a  to  22   g  are defined to have a certain twisted angle to the center shaft of the inner pipe  20 , so all the distribution paths  22   a  to  22   g  may turn around the inner pipe  20  once and pass through the right side of the inner pipe  20 . Accordingly, the branched pipes  60   a  to  60   g  may all extend to the right by being linked to the portions at which the distribution paths  22   a  to  22   g  pass through the right side of the inner pipe  20 . This structure may be understood as an example of a structure in which a plurality of partitions are installed to make a certain twisted angle to the shaft of the main pipe. 
     There may be one set of branched pipes  60   a  to  60   g , although in the second embodiment of the disclosure, there may be a multiple sets of branched pipes  60   a  to  60   g  installed in parallel. The structure as in the second embodiment of the disclosure may be understood as an example of a structure that includes at least two branched pipes connected to one of the plurality of distribution paths. 
     The A-A cross-sectional view of the distributor  2  of  FIG. 7  is similar to what is shown in  FIG. 3 . Even in the second embodiment of the disclosure, the inner diameter Di of the axial part  62   a  differs among the multiple branched pipes  60   a  (three branched pipes  60   a  in  FIG. 7 ). Moreover, in the second embodiment of the disclosure, insertion length L differs among the multiple branched pipes  60   a  (three branched pipes  60   a  in  FIG. 7 ). The same is true of the branched pipes  60   b  to  60   g  linked to the distribution paths  22   b  to  22   g.    
       FIG. 8  illustrates a partially enlarged view of the distributor  2 , according to the second embodiment of the disclosure. Referring to  FIG. 8 , the partition plates  21  are formed to have a twisted angle θ to the center shaft of the inner pipe  20  between the outer pipe  10  and the inner pipe  20 . Accordingly, centrifugal force of the refrigerant in the distribution path  22  may be changed, so that refrigerant flow distribution may be adjusted, thereby increasing heat exchange capability. 
     A specific implementation in which the inner diameter Di of the axial part  62  and the insertion length L may differ among the plurality of branched pipes  60  may be considered to be the same as in the first embodiment. 
     In the meantime, although both the inner diameter Di of the axial part  62  and the insertion length L differ among the plurality of branched pipes  60  in the second embodiment of the disclosure, it will not be limited thereto. The inner diameter Di of the axial part  62  and the insertion length L of the branched pipe  60  may remain the same among the plurality of branched pipes  60 . 
     An overall structure of a distributor  3  according to the third embodiment of the disclosure is similar to that in  FIG. 2 or 7 . The distributor  3  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  3 . Furthermore, the distributor  3  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Moreover, the distributor  3  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
       FIG. 9  illustrates a partially enlarged view of the distributor  3 , according to the second embodiment of the disclosure. Referring to  FIG. 9 , the orifice plate  40  may have the plurality of orifice holes  401  through which to allow the refrigerant to flow into the plurality of distribution paths  22 . In  FIG. 9 , as the plurality of orifice holes  401 , orifice holes  401   a  to  401   g  through which to allow the refrigerant to flow into the plurality of distribution paths  22   a  to  22   g , respectively, are shown. The orifice holes  401   a  to  401   g  are an example of the plurality of orifice holes corresponding to the plurality of distribution paths. In the third embodiment of the disclosure, hole diameter Dh differs among the plurality of orifice holes  401 . Accordingly, refrigerant flow distribution to the plurality of distribution paths  22  may be adjusted, thereby increasing heat exchange capability. 
     Plate thickness of the orifice plate  40  may be equal to or greater than e.g., about 1 mm. 
     An overall structure of a distributor  4  according to the third embodiment of the disclosure is similar to that in  FIG. 2 or 7 . The distributor  4  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  4 . Furthermore, the distributor  4  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Moreover, the distributor  4  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
       FIG. 10  illustrates an A-A cross-sectional view of the distributor  4  according to the fourth embodiment of the disclosure. Referring to  FIG. 10 , the partition plates  21   a  to  21   g  may be installed in the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The branched pipe  60   a  linked and fixed to the distribution path  22   a  is inserted between the partition plates  21   a  and  21   g  that define the distribution path  22   a . In the fourth embodiment of the disclosure, the cross-sectional area differs among the plurality of distribution paths  22 . This structure may be understood as an example of a structure in which a plurality of partitions define a plurality of distribution paths so that cross-sectional areas of the plurality of distribution paths cut across a particular plane may be different. Accordingly, refrigerant flow distribution to the plurality of distribution paths  22  may be adjusted, thereby increasing heat exchange capability. 
       FIG. 11  illustrates a perspective view of a distributor  5 , according to the fifth embodiment of the disclosure. Referring to  FIG. 11 , the distributor  5  is split into a first distributor  71  and a second distributor  72 . The first and second distributors  71  and  72  are an example of two distributor elements. The distributor  5  may include a pipe  70  to distribute the refrigerant to the second distributor  72  right before the refrigerant flows into the first distributor  71 . 
     An overall structure of the first and second distributors  71  and  72  is similar to that in  FIG. 2 or 7 . The first and second distributors  71  and  72  are also to distribute a refrigerant as an example of a fluid that passes in the first and second distributors  71  and  72 . Furthermore, the first and second distributors  71  and  72  may each include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Moreover, the first and second distributors  71  and  72  may each include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     For each of the first and second distributors  71  and  72 , a plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
     Again, in the fifth embodiment of the disclosure, the distributor  5  is split into the first and second distributors  71  and  72 . Accordingly, refrigerant flow distribution into the plurality of distribution paths  22  may be adjusted, thereby increasing heat exchange capability. 
       FIG. 12  illustrates an overall structure of a heat exchange unit including a distributor  6  and a heat exchanger  8 , according to a sixth embodiment of the disclosure. 
     An overall structure of the distributor  6  included in the heat exchange unit according to the sixth embodiment of the disclosure is similar to that in  FIG. 2 or 7 . The distributor  6  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  6 . Furthermore, the distributor  6  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Moreover, the distributor  6  may include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of the heat exchanger. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
     The heat exchanger  8  included in the heat exchange unit in the sixth embodiment of the disclosure performs heat exchange between the refrigerant as an example of a fluid distributed by the distributor  6  and air. The heat exchanger  8  may include a plurality of fins  81  vertically arranged in parallel at preset intervals, a plurality of refrigerant pipes  82  installed in parallel to pass through holes of the fins  81 , a header  83  at which the refrigerant flowing from each of the plurality of refrigerant pipes  82  joins, and an external connection pipe  84  through which to exhaust the refrigerant from the header  83 . 
     The plurality of branched pipes  60  of the distributor  6  may connect to the plurality of refrigerant pipes  82  of the heat exchanger  8  one to one. 
     In the sixth embodiment of the disclosure, the height of the distributor  6  is lower than that of the heat exchanger  8 . With the distributor  6  having the structure as shown in  FIG. 2 , this is possible by densely arranging the branched pipes  60  extending in parallel from the distributor  6 . Furthermore, with the distributor  6  having the structure as shown in  FIG. 7 , this is possible by forming a large twisted angle between the plurality of partition plates  21  and the center shaft of the inner pipe  20 , which enables the branched pipes  60  extending in parallel from the distributor  6  to be densely arranged. Accordingly, refrigerant flow distribution into the plurality of distribution paths  22  may be adjusted, thereby increasing heat exchange capability. 
     In the meantime, in the sixth embodiment of the disclosure, the distributor  6  and the heat exchanger  8  may be compared in height because the distributor  6  and the heat exchanger  8  are installed to be long in the vertical direction, but the embodiments of the disclosure are not limited thereto. For example, any comparison may be made as long as the length across which the branched pipes  60  of the distributor  6  are arranged in parallel and the length across which the refrigerant pipes  82  of the heat exchanger  8  are arranged in parallel may be compared with each other. That is, a structure in which the height of the distributor  6  is lower than the height of the heat exchanger  8  is an example of a structure in which the length of the distributor is shorter than the length across which a plurality of fluid pipes in which a fluid distributed by a distributor of the heat exchanger flows are arranged in parallel. 
     An overall structure of a distributor  7  according to the seventh embodiment of the disclosure is similar to that in  FIG. 2 or 7 . The distributor  7  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  7 . Furthermore, the distributor  7  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Moreover, the distributor  7  may include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
       FIG. 13  illustrates a partially enlarged view of the distributor  7 , according to the seventh embodiment of the disclosure. The distributor  7  may also include the outer pipe  10 , the inner pipe  20 , and the orifice plate  40 . In the seventh embodiment of the disclosure, a position fitting tool for fitting the plurality of distribution paths  22  into the plurality of orifice holes  401  may be installed. Specifically, a convex portion  47  may be formed on the orifice plate  40  and a concave portion  27  may be formed on corresponding one of the plurality of partition plates  21 . By fitting the convex portion  47  into the concave portion  27 , each of the plurality of orifice holes  401  fits to each of the plurality of distribution paths  22 . 
     Accordingly, refrigerant flow distribution to the plurality of distribution paths  22  may be adjusted, thereby increasing heat exchange capability. 
       FIG. 14  illustrates an overall structure of a distributor  101 , according to an eighth embodiment of the disclosure. The distributor  101  is to distribute a refrigerant as an example of a fluid that passes in the distributor  101 . Furthermore, as shown in  FIG. 14 , the distributor  101  may include an outer pipe  10  in the form of a cylinder, and an inner pipe  20  installed in the outer pipe  10 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. 
     In  FIG. 14 , an internal structure of the inner pipe  20  is shown by removing the front of the outer pipe  10 . As shown in  FIG. 14 , a plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. In the eighth embodiment of the disclosure, the plurality of partition plates  21  are installed in parallel with the center shaft of the inner pipe  20 . In  FIG. 14 , as viewed from the front, of the plurality of partition plates  21 , partition plates  21   a  to  21   c  (ends of the partition plates  21   a  to  21   c  on the side of the outer pipe  10 , in particular) are shown, and of the plurality of distribution paths  22 , distribution paths  22   a  to  22   d  are shown. Although it is assumed herein that the plurality of partition plates  21  are installed in parallel with the center shaft of the inner pipe  20 , they may be installed along the shaft of the inner pipe  20 , in which case, the plurality of partition plates  21  are an example of a plurality of partitions installed along the shaft of the main pipe. 
     In the distributor  101 , the outer pipe  10  and the inner pipe  20  are integrated in one unit. That is, the plurality of partition plates  21  are an example of a plurality of partitions installed integrally with the main pipe. 
     Furthermore, the distributor  101  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, the orifice plate  40  installed at the refrigerant upstream end of the inner pipe  20 , and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . The inlet  30  is installed outside the orifice plate  40 , so the orifice plate  40  is not visible from outside even though the orifice plate  40  is illustrated in  FIG. 14 . Furthermore, in  FIG. 14 , the orifice plate  40  may have a plurality of orifice holes  411  (see  FIG. 17 ) through which to allow the refrigerant to flow into the plurality of distribution paths  22 . The cap  50  is to seal off all the plurality of distribution paths  22 . 
     Moreover, the distributor  101  may include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     The plurality of branched pipes  60  may be linked to the plurality of distribution paths  22 .  FIG. 14  shows the branched pipes  60   e  to  60   g  linked to distribution paths  22   e  to  22   g , respectively, in addition to the branched pipes  60   a  to  60   d  linked to the distribution paths  22   a  to  22   d , respectively. 
     This structure may be understood as an example of a structure in which neighboring first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   b  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   b  correspond to the first and second distribution paths and the partition plate  21   a  corresponds to the one of the plurality of partitions. 
     Furthermore, in this structure, the first and second branched pipes may not be adjacent to each other, and the first and second distribution paths may have at least one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   c  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   c  correspond to the first and second distribution paths and the partition plates  21   a  and  21   b  correspond to the at least one of the plurality of partitions. 
     Moreover, as shown in  FIG. 14 , in the eighth embodiment of the disclosure, the branched pipe  60   a  may extend to the right directly from the distribution path  22   a . The branched pipes  60   b  to  60   d  may extend forward from the distribution paths  22   b  to  22   d  first and then bend and extend to the right. The branched pipes  60   e  to  60   g  may extend to the opposite side from the distribution paths  22   e  to  22   g  first and then bend and extend to the right. 
     There may be one set of branched pipes  60   a  to  60   g , although in the eight embodiment of the disclosure, there may be a multiple sets of branched pipes  60   a  to  60   g  installed in parallel. The structure as in the eighth embodiment of the disclosure may be understood as an example of a structure that includes at least two branched pipes connected to one of the plurality of distribution paths. 
       FIG. 15  illustrates an A-A cross-sectional view of the distributor  101  of  FIG. 14 . 
     Referring to  FIG. 15 , in the distributor  101 , the outer pipe  10  and the inner pipe  20  are integrated in one unit. The partition plates  21   a  to  21   g  may be installed in the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer pipe  10  and the center portion of the inner pipe  20 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer side of the inner pipe  20  to the center portion. In  FIG. 15 , the branched pipe  60   a  linked and fixed to the distribution path  22   a  is inserted between the partition plates  21   a  and  21   g  that define the distribution path  22   a . Even in the eighth embodiment of the disclosure, the inner diameter Di of the axial part  62   a  differs among the multiple branched pipes  60   a  (three branched pipes  60   a  in  FIG. 14 ). Moreover, in the eighth embodiment of the disclosure, insertion length L differs among the multiple branched pipes  60   a  (three branched pipes  60   a  in  FIG. 14 ). Although the branched pipe  60   a  linked to the distribution path  22   a  is shown because  FIG. 15  is an A-A cross-sectional view of the distributor  101  of  FIG. 14 , what are described above in connection with the branched pipe  60   a  may be equally applied to the other branched pipes  60   b  to  60   g  linked to the distribution paths  22   a  to  22   g.    
     In the meantime, although both the inner diameter Di of the axial part  62  and the insertion length L differ among the plurality of branched pipes  60  in the eighth embodiment of the disclosure, it will not be limited thereto. At last one of the inner diameter of the axial part  62  or the insertion length L may differ among the plurality of branched pipes  60 . 
     As described above, in the eighth embodiment of the disclosure, the refrigerant flow resistance is changed in the single distribution path  22  while the outer pipe  10  and the inner pipe  20  are integrated in one unit. Accordingly, refrigerant flow distribution may be adjusted while preventing a refrigerant leak, thereby increasing heat exchange capability. 
       FIG. 16  illustrates an overall structure of a distributor  102 , according to a ninth embodiment of the disclosure. The distributor  102  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  102 . Furthermore, as shown in  FIG. 14 , the distributor  102  may include an outer pipe  10  in the form of a cylinder, and an inner pipe  20  installed in the outer pipe  10 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. 
     In  FIG. 16 , an internal structure of the inner pipe  20  is shown by removing the front of the outer pipe  10 . As shown in  FIG. 16 , a plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. In the ninth embodiment of the disclosure, the plurality of partition plates  21  are installed at a twisted angle to the center shaft of the inner pipe  20 . In  FIG. 16 , of the plurality of partition plates  21 , partition plates  21   a  to  21   g  (ends of the partition plates  21   a  to  21   g  on the side of the outer pipe  10 , in particular) are shown, and of the plurality of distribution paths  22 , distribution paths  22   a  to  22   g  are shown. Although it is assumed herein that the plurality of partition plates  21  are installed at a twisted angle to the center shaft of the inner pipe  20 , they may also be said as being installed along the shaft of the inner pipe  20 , in which case, the plurality of partition plates  21  are an example of a plurality of partitions installed along the shaft of the main pipe. 
     In the distributor  102 , the outer pipe  10  and the inner pipe  20  are integrated in one unit. That is, the plurality of partition plates  21  are an example of a plurality of partitions installed integrally with the main pipe. 
     Furthermore, the distributor  102  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, the orifice plate  40  installed at the refrigerant upstream end of the inner pipe  20 , and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . The inlet  30  is installed outside the orifice plate  40 , so the orifice plate  40  is not visible from outside even though the orifice plate  40  is illustrated in  FIG. 14 . Furthermore, in  FIG. 16 , the orifice plate  40  may have a plurality of orifice holes  411  (see  FIG. 17 ) through which to allow the refrigerant to flow into the plurality of distribution paths  22 . The cap  50  is to seal off all the plurality of distribution paths  22 . 
     Moreover, the distributor  102  may include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     The plurality of branched pipes  60  may be linked to the plurality of distribution paths  22 .  FIG. 16  shows the branched pipes  60   a  to  60   g  linked to the distribution paths  22   a  to  22   g , as the plurality of branched pipes  60 . 
     This structure may be understood as an example of a structure in which neighboring first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   b  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   b  correspond to the first and second distribution paths and the partition plate  21   a  corresponds to the one of the plurality of partitions. 
     Furthermore, in this structure, the first and second branched pipes may not be adjacent to each other, and the first and second distribution paths may have at least one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   c  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   c  correspond to the first and second distribution paths and the partition plates  21   a  and  21   b  correspond to the at least one of the plurality of partitions. 
     Moreover, as shown in  FIG. 16 , in the ninth embodiment of the disclosure, the distribution paths  22   a  to  22   g  are defined to have a certain twisted angle to the center shaft of the inner pipe  20 , so all the distribution paths  22   a  to  22   g  may turn around the inner pipe  20  once and pass through the right side of the inner pipe  20 . Accordingly, the branched pipes  60   a  to  60   g  may all extend to the right by being linked to the portions at which the distribution paths  22   a  to  22   g  pass through the right side of the inner pipe  20 . This structure may be understood as an example of a structure in which a plurality of partitions are installed to make a certain twisted angle to the shaft of the main pipe. 
     There may be one set of branched pipes  60   a  to  60   g , although in the ninth embodiment of the disclosure, there may be a multiple sets of branched pipes  60   a  to  60   g  installed in parallel. The structure as in the ninth embodiment of the disclosure may be understood as an example of a structure that includes at least two branched pipes connected to one of the plurality of distribution paths. 
     The A-A cross-sectional view of the distributor  102  of  FIG. 16  is similar to what is shown in  FIG. 15 . Even in the ninth embodiment of the disclosure, the inner diameter Di of the axial part  62   a  differs among the multiple branched pipes  60   a  (three branched pipes  60   a  in  FIG. 16 ). Moreover, in the ninth embodiment of the disclosure, insertion length L differs among the multiple branched pipes  60   a  (three branched pipes  60   a  in  FIG. 16 ). The same is true of the branched pipes  60   b  to  60   g  linked to the distribution paths  22   b  to  22   g.    
     In the meantime, although both the inner diameter Di of the axial part  62  and the insertion length L differ among the plurality of branched pipes  60  in the ninth embodiment of the disclosure, it will not be limited thereto. At last one of the inner diameter of the axial part  62  or the insertion length L may differ among the plurality of branched pipes  60 . 
     As described above, in the ninth embodiment of the disclosure, the refrigerant flow resistance is changed in the single distribution path  22  while the outer pipe  10  and the inner pipe  20  are integrated in one unit. Accordingly, refrigerant flow distribution may be adjusted while preventing a refrigerant leak, thereby increasing heat exchange capability. 
     An overall structure of a distributor  103  according to the tenth embodiment of the disclosure is similar to that in  FIG. 14 or 16 . The distributor  103  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  103 . Furthermore, the distributor  103  may include an outer pipe  10  in the form of a cylinder, and an inner pipe  20  installed in the outer pipe  10 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
     In the distributor  103 , the outer pipe  10  and the inner pipe  20  are integrated in one unit. That is, the plurality of partition plates  21  are an example of a plurality of partitions installed integrally with the main pipe. 
     Furthermore, the distributor  103  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, the orifice plate  40  installed at the refrigerant upstream end of the inner pipe  20 , and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . 
     Moreover, the distributor  103  may include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
       FIG. 17  illustrates a partially enlarged view of the distributor  103 , according to the tenth embodiment of the disclosure. Referring to  FIG. 17 , in the distributor  103 , the orifice plate  40  corresponds to a projected orifice plate  41 , and a brazing sheet  42  is installed between the projected orifice plate  41  and the outer pipe  10 . 
     The projected orifice plate  41  may have a plurality of orifice holes  411  through which to allow the refrigerant to flow into the plurality of distribution paths  22 . Specifically, in  FIG. 17 , the plurality of orifice holes  411  may include orifice holes  411   a  to  411   g  through which to allow the refrigerant to flow into the plurality of distribution paths  22   a  to  22   g , respectively. The projected orifice plate  41  may also include a plurality of projections  412  to be inserted to the plurality of distribution paths  22 . Specifically, in  FIG. 17 , the plurality of projections  412  may include projections  412   a  to  412   g  to be inserted to the distribution paths  22   a  to  22   g , respectively. Each of the plurality of projections  412  may have a through hole in the center, through which to allow the refrigerant flowing from the corresponding orifice hole  411  to flow into the corresponding distribution path  22 . 
     The brazing sheet  42  serves to bond the plurality of projections  412  of the projected orifice plate  41  tightly to the plurality of distribution paths  22  of the outer pipe  10  when the plurality of projections  412  of the projected orifice plate  41  are inserted to the plurality of distribution paths  22  of the outer pipe  10 . The brazing sheet  42  may include a plurality of sheet holes  421  to which the plurality of projections  412  are inserted. The brazing sheet  42  may also include a plurality of projections  422  to be inserted to the plurality of distribution paths  22 . Each of the plurality of projections  422  may have a through hole in the center, through which to allow the refrigerant flowing from the corresponding sheet hole  421  to flow into the corresponding distribution path  22 . 
     However, it is not imperative to install the brazing sheet  42 . Instead of installing the brazing sheet  42 , brazing sheet may be applied to a bonding portion between the projected orifice plate  41  and the outer pipe  10  when the plurality of projections  412  of the projected orifice plate  41  are inserted to the plurality of distribution paths  22  of the outer pipe  10 . 
     As described above, in the tenth embodiment of the disclosure, the orifice plate  40  is provided as the projected orifice plate  41  with projections  412  to be inserted to the plurality of distribution paths  22 . Accordingly, refrigerant flow distribution may be adjusted while preventing a refrigerant leak from the bonding portion between the orifice plate  40  and the outer pipe  10 , thereby increasing heat exchange capability. 
     An overall structure of a distributor  104  according to the eleventh embodiment of the disclosure is similar to that in  FIG. 14 or 16 . The distributor  104  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  104 . Furthermore, the distributor  104  may include an outer pipe  10  in the form of a cylinder, and an inner pipe  20  installed in the outer pipe  10 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
     In the distributor  104 , the outer pipe  10  and the inner pipe  20  are integrated in one unit. That is, the plurality of partition plates  21  are an example of a plurality of partitions installed integrally with the main pipe. 
     Furthermore, the distributor  104  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, the orifice plate  40  installed at the refrigerant upstream end of the inner pipe  20 , and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . 
     Moreover, the distributor  104  may include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
       FIG. 18  illustrates a partially enlarged view of the distributor  104 , according to the eleventh embodiment of the disclosure. Referring to  FIG. 18 , in the distributor  104 , the cap  50  corresponds to a projected cap  51 , and a brazing sheet  52  is installed between the projected cap  51  and the outer pipe  10 . 
     The projected cap  51  may also include a plurality of projections  512  to be inserted to the plurality of distribution paths  22 . Specifically, in  FIG. 18 , the plurality of projections  512  may include projections  512   a  to  512   g  to be inserted to the distribution paths  22   a  to  22   g , respectively. The plurality of projections  512  are hidden in the cap  50  and not visible at an angle as in  FIG. 18 , but they are represented in dashed lines as if seen through the cap  50 . 
     The brazing sheet  52  serves to bond the plurality of projections  512  of the projected cap  51  tightly to the plurality of distribution paths  22  of the outer pipe  10  when the plurality of projections  512  of the projected cap  51  are inserted to the plurality of distribution paths  22  of the outer pipe  10 . The brazing sheet  52  may include a plurality of sheet holes  521  to which the plurality of projections  512  are inserted. The brazing sheet  52  may also include a plurality of projections  522  to be inserted to the plurality of distribution paths  22 . 
     However, it is not imperative to install the brazing sheet  52 . Instead of installing the brazing sheet  52 , brazing sheet may be applied to a bonding portion between the projected cap  51  and the outer pipe  10  when the plurality of projections  512  of the projected cap  51  are inserted to the plurality of distribution paths  22  of the outer pipe  10 . 
     As described above, in the eleventh embodiment of the disclosure, the cap  50  may be provided as the projected cap  51  with the projections  512  to be inserted to the plurality of distribution paths  22 . Accordingly, refrigerant flow distribution may be adjusted while preventing a refrigerant leak from the bonding portion between the cap  50  and the outer pipe  10 , thereby increasing heat exchange capability. 
     An overall structure of a distributor  105  according to the twelfth embodiment of the disclosure is similar to that in  FIG. 14 or 16 . The distributor  105  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  105 . Furthermore, the distributor  105  may include an outer pipe  10  in the form of a cylinder, and an inner pipe  20  installed in the outer pipe  10 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
     In the distributor  105 , the outer pipe  10  and the inner pipe  20  are integrated in one unit. That is, the plurality of partition plates  21  are an example of a plurality of partitions installed integrally with the main pipe. 
     Furthermore, the distributor  105  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, the orifice plate  40  installed at the refrigerant upstream end of the inner pipe  20 , and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . 
     Moreover, the distributor  105  may include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
       FIG. 19  illustrates a perspective view of an exterior cover  12 , according to the twelfth embodiment of the present disclosure. Referring to  FIG. 19 , the exterior cover  12  may include a plurality of burring holes  13 . The plurality of branched pipes  60  may be connected to the exterior cover  12  by being inserted to the plurality of burring holes  13 , respectively, The exterior cover  12  as used herein is an example of a cover mounted on the outer circumference of the main pipe. 
       FIG. 20  illustrates a partially enlarged view of the distributor  105 , according to the twelfth embodiment of the disclosure. For the distributor  105  having the same structure as in  FIG. 16 , the branched pipes  60  is connected from one direction, so that the single exterior cover  12  may be attached to the outer pipe  10 . However, it is assumed herein that in the distributor  105  having the same structure as in  FIG. 14 , the branched pipes  60  are connected from multiple directions. Hence, the outer pipe  10  as shown in  FIG. 20  has an exterior cover  12   a  with burring holes  13   a  and an exterior cover  12   b  with burring holes  13   b  attached to the outer pipe  10  to face different directions. In this case, the exterior cover  12   a  may be fixed to the outer pipe  10  by bending a catch  14   a  at its end in a direction as indicated by an arrow Da, as shown in  FIG. 20 . The exterior cover  12   b  may be fixed to the outer pipe  10  by bending a catch  14   b  at its end in a direction as indicated by an arrow Db. Alternatively, instead of the way the exterior covers  12   a  and  12   b  are fixed to the outer pipe  10  by bending the catches  14   a  and  14   b  at their ends, the exterior covers  12   a  and  12   b  may be fixed to the outer pipe  10  by wrapping a steel line around the outer pipe  10  and exterior covers  12   a  and  12   b  altogether while attaching the exterior covers  12   a  and  12   b  to the outer pipe  10 . 
     Although there are two exterior covers  12  attached to the outer pipe  10  in  FIG. 20 , three or more exterior covers  12  may be attached to the outer pipe  10 . 
     Furthermore, although the burring holes  13  are formed at the exterior cover  12  to attach the exterior cover  12  to the outer pipe  10 , the disclosure is not limited thereto. For example, the burring holes  13  may be formed right at the outer pipe  10 . 
     As described above, in the twelfth embodiment of the disclosure, the plurality of branched pipes  60  are inserted to the plurality of burring holes  13 . Accordingly, refrigerant flow distribution may be adjusted while preventing a refrigerant leak from the bonding portion between the branched pipes  60  and the outer pipe  10 , thereby increasing heat exchange capability. 
       FIG. 21  illustrates an overall structure of a heat exchange unit including a distributor  106  and the heat exchanger  8 , according to a thirteenth embodiment of the disclosure. 
     An overall structure of the distributor  106  included in the heat exchange unit according to the thirteenth embodiment of the disclosure is similar to that in  FIG. 14 or 16 . The distributor  106  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  106 . Furthermore, the distributor  106  may include an outer pipe  10  in the form of a cylinder, and an inner pipe  20  installed in the outer pipe  10 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
     In the distributor  106 , the outer pipe  10  and the inner pipe  20  are integrated in one unit. That is, the plurality of partition plates  21  are an example of a plurality of partitions installed integrally with the main pipe. 
     Furthermore, the distributor  106  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, the orifice plate  40  installed at the refrigerant upstream end of the inner pipe  20 , and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . 
     Moreover, the distributor  106  may include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes  82  of the heat exchanger  8  as will be described later. 
     The heat exchanger  8  included in the heat exchange unit in the thirteenth embodiment of the disclosure performs heat exchange between the refrigerant as an example of a fluid distributed by the distributor  106  and air. The heat exchanger  8  may include a plurality of fins  81  vertically arranged in parallel at preset intervals, a plurality of refrigerant pipes  82  as an example of a plurality of fluid pipes installed in parallel to pass through holes of the fins  81 , a header  83  at which the refrigerant flowing from each of the plurality of refrigerant pipes  82  joins, and an external connection pipe  84  through which to exhaust the refrigerant from the header  83 . 
     The plurality of branched pipes  60  of the distributor  106  may connect to the plurality of refrigerant pipes  82  of the heat exchanger  8  one to one. 
     As described above, in the thirteenth embodiment of the disclosure, the refrigerant flow resistance is changed in the single distribution path  22  while the outer pipe  10  and the inner pipe  20  are integrated in one unit. Accordingly, refrigerant flow distribution may be adjusted while preventing a refrigerant leak, thereby increasing heat exchange capability. 
       FIG. 22  illustrates an overall structure of a distributor  201 , according to a fourteenth embodiment of the disclosure. The distributor  201  is to distribute a refrigerant as an example of a fluid that passes in the distributor  201 . Furthermore, as shown in  FIG. 22 , the distributor  201  may include an outer pipe  10  in the form of a cylinder, an inner pipe  20  installed in the outer pipe  10 , and an orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Furthermore, the distributor  201  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . The inlet  30  is installed outside the orifice plate  40 , so the orifice plate  40  is not visible from outside even though the orifice plate  40  is illustrated in  FIG. 22 . Moreover, the distributor  201  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     In  FIG. 22 , an internal structure of the inner pipe  20  is shown by removing the front of the outer pipe  10 . As shown in  FIG. 22 , a plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. In the fourteenth embodiment of the disclosure, the plurality of partition plates  21  are installed in parallel with the center shaft of the inner pipe  20 . In  FIG. 22 , as viewed from the front, of the plurality of partition plates  21 , partition plates  21   a  to  21   c  (ends of the partition plates  21   a  to  21   c  on the side of the outer pipe  10 , in particular) are shown, and of the plurality of distribution paths  22 , distribution paths  22   a  to  22   d  are shown. Although it is assumed herein that the plurality of partition plates  21  are installed in parallel with the center shaft of the inner pipe  20 , they may be installed along the shaft of the inner pipe  20 , in which case, the plurality of partition plates  21  are an example of a plurality of partitions installed along the shaft of the main pipe. 
     Furthermore, in  FIG. 22 , the orifice plate  40  may have a plurality of orifice holes through which to allow the refrigerant to flow into the plurality of distribution paths  22 . 
     The plurality of branched pipes  60  may be linked to the plurality of distribution paths  22 .  FIG. 22  shows the branched pipes  60   e  to  60   g  linked to distribution paths  22   e  to  22   g , respectively, in addition to the branched pipes  60   a  to  60   d  linked to the distribution paths  22   a  to  22   d , respectively. 
     This structure may be understood as an example of a structure in which neighboring first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   b  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   b  correspond to the first and second distribution paths and the partition plate  21   a  corresponds to the one of the plurality of partitions. 
     Furthermore, in this structure, the first and second branched pipes may not be adjacent to each other, and the first and second distribution paths may have at least one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   c  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   c  correspond to the first and second distribution paths and the partition plates  21   a  and  21   b  correspond to the at least one of the plurality of partitions. 
     Moreover, as shown in  FIG. 22 , in the fourteenth embodiment of the disclosure, the branched pipe  60   a  may extend to the right directly from the distribution path  22   a . The branched pipes  60   b  to  60   d  may extend forward from the distribution paths  22   b  to  22   d  first and then bend and extend to the right. The branched pipes  60   e  to  60   g  may extend to the opposite side from the distribution paths  22   e  to  22   g  first and then bend and extend to the right. 
     There may be one set of branched pipes  60   a  to  60   g , although in the fourteenth embodiment of the disclosure, there may be a multiple sets of branched pipes  60   a  to  60   g  installed in parallel. The structure as in the fourteenth embodiment of the disclosure may be understood as an example of a structure that includes at least two branched pipes connected to one of the plurality of distribution paths. 
       FIGS. 23 to 25  are cross-sectional views along line A-A of the distributor  201  of  FIG. 22 . Referring to  FIGS. 23 to 25 , the partition plates  21   a  to  21   g  may be installed in the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer pipe  10  and the center portion of the inner pipe  20 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer side of the inner pipe  20  to the center portion. Step parts  23   a  to  23   g  may be formed on each of the partition plates  21   a  to  21   g . Furthermore, the branched pipe  60   a  linked and fixed to the distribution path  22   a  is inserted between the partition plates  21   a  and  21   g  that define the distribution path  22   a  and supported by the step parts  23   a  and  23   g . In this case, assuming that the partition plates  21   a  and  21   g  are an example of two neighboring partitions, the distribution path  22   a  corresponds to a distribution path defined by the two partitions, the branched pipe  60   a  corresponds to a branched pipe connected to a distribution path among the plurality of branched pipes, and the step parts  23   a  and  23   g  corresponds to at least one step part that supports the branched pipe. 
     In  FIGS. 23 to 25 , the step parts  23   a  to  23   g  each include two steps without being limited thereto. For example, the step parts  23   a  to  23   g  may each include one step or three or more steps. For example, when the step parts  23   a  and  23   g  each includes two or more steps, the branched pipe  60   a  may be put in until reaching the second or outer steps of the step parts  23   a  and  23   g  from the center portion of the inner pipe  20 . This makes a step on the side of the refrigerant inlet of the branched pipe  60 , which enables changing of fluid resistance of the refrigerant and adjustment of refrigerant flow distribution. 
     Furthermore, in the fourteenth embodiment of the disclosure, among the plurality of branched pipes  60   a  (three branched pipes  60   a  in  FIG. 22 ), differing the position of steps of the step parts  23   a  and  23   g  supporting the branched pipe  60   a  may differ the inner diameter D of the axial part  62   a . This structure is an example of a structure in which the inner diameter of the axial part differs as the branched pipe is supported by different ones of the plurality of steps. 
     Furthermore, in the fourteenth embodiment of the disclosure, among the plurality of branched pipes  60   a  (three branched pipes  60   a  in  FIG. 22 ), differing the position of steps of the step parts  23   a  and  23   g  to support the branched pipe  60   a  may differ the insertion length L of the branched pipe  60   a  as illustrated in  FIG. 24 . This structure is an example of a structure in which the insertion length to the distribution path differs as the branched pipe is supported by different ones of the plurality of steps. 
     Furthermore, in the fourteenth embodiment of the disclosure, as illustrated in  FIG. 25 , the insertion length L of the branched pipe  60   a  may be set to be less than half of depth H of the distribution path  22   a . In this case, the step parts  23   a  to  23   g  may include steps at positions further outside the half of the depth H of the distribution paths  22   a  to  22   g  to support the branched pipe  60   a.    
       FIG. 26  illustrates a graph representing a reason why it is desirable to have the insertion length L of a branched pipe  60  be less than half the depth H of the distribution path  22 . In this graph, the horizontal axis represents insertion length tolerance. The insertion length tolerance represents positive errors toward shorter insertion length L and negative errors toward longer insertion length L based on the half of the depth H. It may be seen from the graph that when the insertion length L is long, the percentage of flow distribution rapidly changes for the deviation of the insertion length tolerance, and that when the insertion length L is short, the percentage of flow distribution is slowly changed and stable for the deviation of the insertion length tolerance. Hence, it is desirable to have the insertion length L of the branched pipe  60  be less than half the depth H of the distribution path  22 . 
     The structure herein is an example of a structure of having the insertion length to the distribution path be less than half the depth of the distribution path by supporting the branched pipe by particular steps at shallow positions not deeper than half the depth of the distribution path. In this case, the particular steps may correspond to the steps further outside the half of the depth H of the distribution paths  22   a  to  22   b.    
     Although the branched pipe  60   a  linked to the distribution path  22   a  is shown because  FIGS. 23 to 25  are A-A cross-sectional views of the distributor  201  of  FIG. 22 , what are described above in connection with the branched pipe  60   a  may be equally applied to the other branched pipes  60   b  to  60   g  linked to the distribution paths  22   a  to  22   g.    
     As described above, in the fourteenth embodiment of the disclosure, the inner diameter D of the axial part of the branched pipes  60  or the insertion length L of the branched pipes  60  differs among the plurality of branched pipes  60 , or the insertion length L of the branched pipes  60  may be set to be less than half the depth H of the distribution path  22 . Accordingly, refrigerant flow distribution may be adjusted, thereby increasing heat exchange capability. 
       FIG. 27  illustrates an A-A cross-sectional view of the distributor  201  of  FIG. 22 . 
     Referring to  FIG. 27 , the partition plates  21   a  to  21   g  may be installed in the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer pipe  10  and the center portion of the inner pipe  20 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer side of the inner pipe  20  to the center portion. Step parts  23   a  to  23   g  may be formed on each of the partition plates  21   a  to  21   g . Furthermore, the branched pipe  60   a  linked and fixed to the distribution path  22   a  is inserted between the partition plates  21   a  and  21   g  that define the distribution path  22   a  and supported by the step parts  23   a  and  23   g . In this case, assuming that the partition plates  21   a  and  21   g  are an example of two neighboring partitions, the distribution path  22   a  corresponds to a distribution path defined by the two partitions, the branched pipe  60   a  corresponds to a branched pipe connected to a distribution path among the plurality of branched pipes, and the step parts  23   a  and  23   g  corresponds to at least one step part that supports the branched pipe. 
     In  FIG. 27 , the step parts  23   a  to  23   g  each include a step without being limited thereto. For example, the step parts  23   a  to  23   g  may each include two or more steps. 
     In the fourteenth embodiment of the disclosure, a refrigerant inflow area  51  at the front end of the branched pipe  60   a  that occupies a portion further inside than the steps of the step parts  23   a  and  23   g  supporting the branched pipe  60   a  may be different from a refrigerant passing area S 2  around the branched pipe  60   a  that occupies a portion further outside than the steps supporting the branched pipe  60   a . As described above, changes in ratio between the refrigerant inflow area  51  at the front end of the branched pipe  60   a  and the refrigerant passing area S 2  around the branched pipe  60   a  may enable adjustment of the refrigerant flow distribution, thereby increasing the heat exchange capability. 
     Although the branched pipe  60   a  linked to the distribution path  22   a  is shown because  FIG. 27  is an A-A cross-sectional view of the distributor  201  of  FIG. 22 , what are described above in connection with the branched pipe  60   a  may be equally applied to the other branched pipes  60   b  to  60   g  linked to the distribution paths  22   a  to  22   g.    
       FIG. 28  illustrates an overall structure of a distributor  202 , according to a fifteenth embodiment of the disclosure. The distributor  202  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  202 . Furthermore, as shown in  FIG. 28 , the distributor  202  may include an outer pipe  10  in the form of a cylinder, an inner pipe  20  installed in the outer pipe  10 , and an orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Furthermore, the distributor  202  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . The inlet  30  is installed outside the orifice plate  40 , so the orifice plate  40  is not visible from outside even though the orifice plate  40  is illustrated in  FIG. 22 . Moreover, the distributor  202  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     In  FIG. 28 , an internal structure of the inner pipe  20  is shown by removing the front of the outer pipe  10 . As shown in  FIG. 22 , a plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. In the fifteenth embodiment of the disclosure, the plurality of partition plates  21  are installed at a twisted angle to the center shaft of the inner pipe  20 . In  FIG. 28 , of the plurality of partition plates  21 , partition plates  21   a  to  21   g  (ends of the partition plates  21   a  to  21   g  on the side of the outer pipe  10 , in particular) are shown, and of the plurality of distribution paths  22 , distribution paths  22   a  to  22   g  are shown. Although it is assumed herein that the plurality of partition plates  21  are installed at a twisted angle to the center shaft of the inner pipe  20 , they may also be said as being installed along the shaft of the inner pipe  20 , in which case, the plurality of partition plates  21  are an example of a plurality of partitions installed along the shaft of the main pipe. 
     Furthermore, in  FIG. 28 , the orifice plate  40  may have a plurality of orifice holes through which to allow the refrigerant to flow into the plurality of distribution paths  22 . 
     The plurality of branched pipes  60  may be linked to the plurality of distribution paths  22 . In  FIG. 28 , the branched pipes  60   a  to  60   g  linked to the distribution paths  22   a  to  22   g  are shown as the plurality of branched pipes  60 . 
     This structure may be understood as an example of a structure in which neighboring first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   b  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   b  correspond to the first and second distribution paths and the partition plate  21   a  corresponds to the one of the plurality of partitions. 
     Furthermore, in this structure, the first and second branched pipes may not be adjacent to each other, and the first and second distribution paths may have at least one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   c  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   c  correspond to the first and second distribution paths and the partition plates  21   a  and  21   b  correspond to the at least one of the plurality of partitions. 
     Moreover, as shown in  FIG. 28 , in the fifteenth embodiment of the disclosure, the distribution paths  22   a  to  22   g  are defined to have a certain twisted angle to the center shaft of the inner pipe  20 , so all the distribution paths  22   a  to  22   g  may turn around the inner pipe  20  once and pass through the right side of the inner pipe  20 . Accordingly, the branched pipes  60   a  to  60   g  may all extend to the right by being linked to the portions at which the distribution paths  22   a  to  22   g  pass through the right side of the inner pipe  20 . This structure may be understood as an example of a structure in which a plurality of partitions are installed to make a certain twisted angle to the shaft of the main pipe. 
     There may be one set of branched pipes  60   a  to  60   g , although in the fifteenth embodiment of the disclosure, there may be a multiple sets of branched pipes  60   a  to  60   g  installed in parallel. The structure as in the fifteenth embodiment of the disclosure may be understood as an example of a structure that includes at least two branched pipes connected to one of the plurality of distribution paths. 
     The A-A cross-sectional view of the distributor  202  of  FIG. 28  is similar to what is shown in  FIGS. 23 to 25 . Furthermore, in the fifteenth embodiment of the disclosure, among the plurality of branched pipes  60   a  (three branched pipes  60   a  in  FIG. 28 ), differing the position of steps of the step parts  23   a  and  23   g  supporting the branched pipe  60   a  may differ the inner diameter D of the vena contracta  62   a . This structure is an example of a structure in which the inner diameter of the axial part differs as the branched pipe is supported by different ones of the plurality of steps. Furthermore, in the fifteenth embodiment of the disclosure, among the plurality of branched pipes  60   a  (three branched pipes  60   a  in  FIG. 28 ), differing the position of steps of the step parts  23   a  and  23   g  supporting the branched pipe  60   a  may differ the insertion length L of the branched pipe  60   a . This structure is an example of a structure in which the insertion length to the distribution path differs as the branched pipe is supported by different ones of the plurality of steps. Furthermore, in the fifteenth embodiment of the disclosure, the insertion length L of the branched pipe  60   a  may be set to be less than half of the depth H of the distribution path  22   a . The structure herein is an example of a structure of having the insertion length to the distribution path be less than half of the depth of the distribution path by supporting the branched pipe by particular steps at shallow positions not deeper than half the depth of the distribution path. The same is true of the branched pipes  60   b  to  60   g  linked to the distribution paths  22   b  to  22   g.    
     As described above, in the fifteenth embodiment of the disclosure, the inner diameter D of the axial part of the branched pipes  60  or the insertion length L of the branched pipes  60  differs among the plurality of branched pipes  60 , or the insertion length L of the branched pipes  60  may be set to be less than half the depth H of the distribution path  22 . Accordingly, refrigerant flow distribution may be adjusted, thereby increasing heat exchange capability. 
     The A-A cross-sectional view of the distributor  202  of  FIG. 28  is similar to what is shown in  FIG. 27 . In the fifteenth embodiment of the disclosure, a refrigerant inflow area S 1  at the front end of the branched pipe  60   a  that occupies a portion further inside than the steps of the step parts  23   a  and  23   g  supporting the branched pipe  60   a  may be different from a refrigerant passing area S 2  around the branched pipe  60   a  that occupies a portion further outside than the steps supporting the branched pipe  60   a . As described above, changes in ratio between the refrigerant inflow area S 1  at the front end of the branched pipe  60   a  and the refrigerant passing area S 2  around the branched pipe  60   a  may enable adjustment of the refrigerant flow distribution, thereby increasing the heat exchange capability. The same is true of the branched pipes  60   b  to  60   g  linked to the distribution paths  22   b  to  22   g.    
     An overall structure of a distributor  203  according to the sixteenth embodiment of the disclosure is similar to that in  FIG. 22 or 28 . The distributor  203  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  203 . Furthermore, the distributor  203  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Moreover, the distributor  203  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. The inner pipe  20  is an example of a member that includes a plurality of partitions. 
       FIG. 29  illustrates a partially enlarged view of the distributor  203 , according to the sixteenth embodiment of the disclosure. The distributor  203  having the structure as in  FIG. 28  is taken as an example herein. In the sixteenth embodiment of the disclosure, the distributor  203  may be manufactured by joining the outer pipe  10  and the inner pipe  20  by shrinking of the outer pipe  10  or expanding of the inner pipe  20 . 
     In other words, in the sixteenth embodiment of the disclosure, the outer pipe  10  and the inner pipe  20  which are separately prepared may be bonded together by shrinking of the outer pipe  10  or expanding of the inner pipe  20 . Accordingly, in the distributor  203  having the structure as in  FIG. 22 , the number of partition plates  21  may be arbitrarily changed based on a capability of the heat exchanger. In addition to this, the distributor  203  having the structure as in  FIG. 28  may allow the twisted angle θ as represented in  FIG. 29  to be arbitrarily changed according to a capability of the heat exchanger. 
     An overall structure of a distributor  204  according to the seventeenth embodiment of the disclosure is similar to that in  FIG. 22 or 28 . The distributor  204  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  204 . Furthermore, the distributor  204  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Moreover, the distributor  204  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
       FIG. 30  illustrates a partially enlarged view of the distributor  204 , according to the seventeenth embodiment of the disclosure. The distributor  204  having the structure as in  FIG. 28  is taken as an example herein. Referring to  FIG. 20 , the distributor  204  may have a modified rib  24  crumpled and modified by contact with the outer pipe  10  installed at the front end of the partition plate  21  of the inner pipe  20 . The modified rib  24  may be a crushed rib  24 . 
     That is, in the seventeenth embodiment of the disclosure, the modified rib  24  may be formed at the front end of the partition plate  21  of the inner pipe  20 . Accordingly, refrigerant flow distribution may be adjusted while preventing a refrigerant leak, thereby increasing heat exchange capability. 
       FIG. 31  illustrates an overall structure of a heat exchange unit including a distributor  205  and the heat exchanger  8 , according to an eighteenth embodiment of the disclosure. 
     An overall structure of the distributor  205  included in the heat exchange unit according to the eighteenth embodiment of the disclosure is similar to that in  FIG. 22 or 28 . The distributor  205  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  205 . Furthermore, the distributor  205  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. Moreover, the distributor  205  may include the plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes  82  of the heat exchanger  8  as will be described later. 
     A plurality of partition plates  21  are installed in the inner pipe  20 , defining a plurality of distribution paths  22  accordingly. 
     The heat exchanger  8  included in the heat exchange unit in the eighteenth embodiment of the disclosure performs heat exchange between the refrigerant as an example of a fluid distributed by the distributor  205  and air. The heat exchanger  8  may include a plurality of fins  81  vertically arranged in parallel at preset intervals, a plurality of refrigerant pipes  82  as an example of a plurality of fluid pipes installed in parallel to pass through holes of the fins  81 , a header  83  at which the refrigerant flowing from each of the plurality of refrigerant pipes  82  joins, and an external connection pipe  84  through which to exhaust the refrigerant from the header  83 . 
     The plurality of branched pipes  60  of the distributor  205  may connect to the plurality of refrigerant pipes  82  of the heat exchanger  8 . 
     In the eighteenth embodiment of the disclosure, as shown in  FIG. 31 , the plurality of branched pipes  60  of the distributor  205  may not necessarily be connected to the plurality of refrigerant pipes  82  one to one. At least one of the plurality of branched pipes  60  may have a Y branch  64  on the downstream side, and two branched pipes  65  before one Y branch  64  may be connected to two refrigerant pipes  82  one to one. 
     This will be described by way of a specific example. 
     What is illustrated in  FIG. 31  is an example of the heat exchanger  8  requiring more refrigerant flow to the refrigerant pipes  82  in an upper region R 1  of the heat exchanger  8  and less refrigerant flow to the refrigerant pipes  82  in a lower region R 2  of the heat exchanger  8 . 
     When the branched pipes  60  are connected to the refrigerant pipes  82  in the upper region R 1  one to one, the insertion length L can be short for more refrigerant flow to the refrigerant pipes  82  in the upper region R 1 . Having the short insertion length L is desirable even in terms of making small changes in percentage of flow distribution for the deviation of the insertion length L, as described above with reference to the graph of  FIG. 26 . 
     When the branched pipes  60  are connected to the refrigerant pipes  82  in the upper region R 1  one to one, the insertion length L cab be long for less refrigerant flow to the refrigerant pipes  82  in the lower region R 1 . However, the long insertion length L leads to a big change in percentage of flow distribution for the deviation of the insertion length L, in terms of which it is desirable that the branched pipe  60  is connected to the distributor  205  with short insertion length L. Hence, in the eighteenth embodiment of the disclosure, instead of connecting the refrigerant pipes  82  to the branched pipes  60  one to one, one branched pipe  60  may be connected to two refrigerant pipes  82  and in this case, the insertion length L can be short. Accordingly, more refrigerant flows into the branched pipe  60  at first, but afterward, less refrigerant flows into each branched pipe  65  due to the Y branch  64 . 
     In the meantime, although the Y branches  64  are installed at the branched pipes  60  connected to the refrigerant pipes  82  in the lower region of the heat exchanger  8 , the installation of the Y branches  64  is not limited thereto. For example, the Y branch  64  may be installed at the branched pipes  60  connected to the refrigerant pipes  82  in both the upper region and the lower region of the heat exchanger  8 , and may not be installed at the branched pipes  60  connected to the refrigerant pipes  82  in a middle region of the heat exchanger  8 . Alternatively, the Y branches  64  may be installed at the branched pipes  60  connected to the refrigerant pipes  82  in the whole regions of the heat exchanger  8 . 
     Furthermore, although the Y branch  64  into two branched pipes  65  is installed in the downstream side of the branched pipe  60  of the distributor  205 , it is not limited thereto. For example, a branch into three or more branched pipes  65  may be installed in the downstream side of the branched pipe  60  of the distributor  205 . 
     As described above, in the eighteenth embodiment of the disclosure, at least one of the plurality of branched pipes  60  may have a branch into multiple branched pipes  65  installed in the downstream side of the branched pipe  60 , and the multiple branched pipes  54  may be connected to the plurality of refrigerant pipes  82  one to one. Accordingly, refrigerant flow distribution to the refrigerant pipes  82  may be stably adjusted, thereby increasing heat exchange capability. 
       FIG. 32  illustrates an overall structure of a distributor  301 , according to a nineteenth embodiment of the disclosure. The distributor  301  is to distribute a refrigerant as an example of a fluid that passes in the distributor  301 . Furthermore, as shown in  FIG. 32 , the distributor  301  may include an outer pipe  10  in the form of a cylinder, an inner pipe  20  installed in the outer pipe  10 , and an orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. The inner pipe  20  is also shown as having the shape of a cylinder, but it may have no hollow, in which case the inner pipe  20  is an example of an inner shaft installed in the outer pipe  10 . Furthermore, the distributor  301  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . The inlet  30  is installed outside the orifice plate  40 , so the orifice plate  40  is not visible from outside even though the orifice plate  40  is illustrated in  FIG. 32 . Moreover, the distributor  301  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     In  FIG. 32 , an internal structure of the outer pipe  10  is shown by removing the front of the outer pipe  10 . As shown in  FIG. 32 , a plurality of partition plates  21  are installed in the inner pipe  20  or the outer pipe  10 , defining a plurality of distribution paths  22  accordingly. In the nineteenth embodiment of the disclosure, the plurality of partition plates  21  are installed in parallel with the center shaft of the inner pipe  20 . In  FIG. 32 , as viewed from the front, of the plurality of partition plates  21 , partition plates  21   a  to  21   c  (ends of the partition plates  21   a  to  21   c  on the side of the outer pipe  10 , in particular) are shown, and of the plurality of distribution paths  22 , distribution paths  22   a  to  22   d  are shown. Although it is assumed herein that the plurality of partition plates  21  are installed in parallel with the center shaft of the inner pipe  20 , they may be installed along the shaft of the inner pipe  20 , i.e., the shaft of the outer pipe  10 , in which case the plurality of partition plates  21  are an example of a plurality of partitions installed along the shaft of the outer pipe  10 . Or, it is an example of a plurality of partitions defining a plurality of distribution paths between the outer pipe and the inner pipe. 
     Furthermore, in  FIG. 32 , the orifice plate  40  may have a plurality of orifice holes through which to allow the refrigerant to flow into the plurality of distribution paths  22 . 
     The plurality of branched pipes  60  may be linked to the plurality of distribution paths  22 .  FIG. 32  shows the branched pipes  60   e  to  60   g  linked to distribution paths  22   e  to  22   g , respectively, in addition to the branched pipes  60   a  to  60   d  linked to the distribution paths  22   a  to  22   d , respectively. 
     This structure may be understood as an example of a structure in which neighboring first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   b  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   b  correspond to the first and second distribution paths and the partition plate  21   a  corresponds to the one of the plurality of partitions. 
     Furthermore, in this structure, the first and second branched pipes may not be adjacent to each other, and the first and second distribution paths may have at least one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   c  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   c  correspond to the first and second distribution paths and the partition plates  21   a  and  21   b  correspond to the at least one of the plurality of partitions. 
     Moreover, as shown in  FIG. 32 , in the nineteenth embodiment of the disclosure, the branched pipe  60   a  may extend to the right directly from the distribution path  22   a . The branched pipes  60   b  to  60   d  may extend forward from the distribution paths  22   b  to  22   d  first and then bend and extend to the right. The branched pipes  60   e  to  60   g  may extend to the opposite side from the distribution paths  22   e  to  22   g  first and then bend and extend to the right. 
     There may be one set of branched pipes  60   a  to  60   g , although in the nineteenth embodiment of the disclosure, there may be a multiple sets of branched pipes  60   a  to  60   g  installed in parallel. The structure as in the nineteenth embodiment of the disclosure may be understood as an example of a structure that includes at least two branched pipes connected to one of the plurality of distribution paths. 
       FIGS. 33A and 33B  illustrate a first example of the distributor  301  of  FIG. 32 .  FIG. 33A  shows the first example of a perspective view of the refrigerant upstream end of the distributor  301  of  FIG. 32 , and  FIG. 33B  shows the first example of a B-B cross-sectional view of the distributor  301  of  FIG. 32 . It corresponds to a cross-sectional view resulting from cutting along the dashed line on the surface of the outer pipe  10  of  FIG. 33A . The partition plates  21   a  to  21   g  may be installed integrally with the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer side of the inner pipe  20  and the center portion of the inner pipe  20 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer side of the inner pipe  20  to the center portion. Furthermore, the partition plates  21   a  to  21   g  may be bonded to the outer pipe  10  with a substance  25   a  to  25   g . The substance  25   a  to  25   g  may be e.g., an adhesive without being limited thereto. The substance  25   a  to  25   g  may be any heterogeneous material different from material(s) of the outer pipe  10  and the inner pipe  20 . Furthermore, in the nineteenth embodiment of the disclosure, the outer pipe  10  is subject to a recess process at locations corresponding to the distribution paths  22   a  to  22   g  on the dashed line of the refrigerant upstream end. Accordingly, recesses  11   a  to  11   g , i.e., concave portions, may be formed from the outer surface of the outer pipe  10 , and may serve as projections, i.e., convex portions into the distribution paths  22   a  to  22   g . The location corresponding to the distribution paths  22   a  to  22   g  on the dashed line of the refrigerant upstream end of the outer pipe  10  is an example of a first location of an open end, and may include any location from the inlet of the distribution path  22  to the branched pipe  60  on the utmost refrigerant upstream side. 
       FIGS. 34A and 34B  illustrate a second example of the distributor  301  of  FIG. 32 .  FIG. 34A  shows the second example of a perspective view of the refrigerant upstream end of the distributor  301  of  FIG. 32 , and  FIG. 34B  shows the second example of a B-B cross-sectional view of the distributor  301  of  FIG. 32 . It corresponds to a cross-sectional view resulting from cutting along the dashed line on the surface of the outer pipe  10  of  FIG. 34A . The partition plates  21   a  to  21   g  may be installed integrally with the outer pipe  10 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer circumferential face of the outer pipe  10  and the inner side of the outer pipe  10 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer circumferential face to the inner side of the outer pipe  10 . Furthermore, the partition plates  21   a  to  21   g  may be bonded to the inner pipe  20  with the substance  25   a  to  25   g . The substance  25   a  to  25   g  may be e.g., an adhesive without being limited thereto. The substance  25   a  to  25   g  may be any heterogeneous material different from material(s) of the outer pipe  10  and the inner pipe  20 . Furthermore, in the nineteenth embodiment of the disclosure, the outer pipe  10  may be subject to a recess process at locations corresponding to the distribution paths  22   a  to  22   g  on the dashed line of the refrigerant upstream end. Accordingly, recesses  11   a  to  11   g , i.e., concave portions, may be formed from the outer surface of the outer pipe  10 , and may serve as projections, i.e., convex portions into the distribution paths  22   a  to  22   g . The location corresponding to the distribution paths  22   a  to  22   g  on the dashed line of the refrigerant upstream end of the outer pipe  10  is an example of a first location of an open end, and may include any location from the inlet of the distribution path  22  to the branched pipe  60  on the utmost refrigerant upstream side. 
     As described above, in the nineteenth embodiment of the disclosure, the substance  25   a  to  25   g  may be put in between the partition plates  21   a  to  21   g  installed integrally with the inner pipe  20  and the outer pipe  10  or between the partition plates  21   a  to  21   g  installed integrally with the outer pipe  10  and the inner pipe  20 . Accordingly, a refrigerant leak between the outer pipe  10  and the partition plates  21   a  to  21   g  or between the inner pipe  20  and the partition plates  21   a  to  21   g  may be prevented, which enables adjustment of refrigerant flow to each distribution path  22 . 
     Furthermore, in the nineteenth embodiment of the disclosure, the outer pipe  10  may be subject to a recess process to form a projection into the distribution path  22 . Accordingly, heat exchange capability may be increased by changing a local area of the distribution path  22  and adjusting a refrigerant flow to each distribution path  22 . 
       FIG. 35  illustrates an overall structure of a distributor  302 , according to a twentieth embodiment of the disclosure. The distributor  302  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  302 . Furthermore, as shown in  FIG. 35 , the distributor  302  may include an outer pipe  10  in the form of a cylinder, an inner pipe  20  installed in the outer pipe  10 , and an orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. The inner pipe  20  is also shown as having the shape of a cylinder, but it may have no hollow, in which case the inner pipe  20  is an example of an inner shaft installed in the outer pipe  10 . Furthermore, the distributor  302  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . The inlet  30  is installed outside the orifice plate  40 , so the orifice plate  40  is not visible from outside even though the orifice plate  40  is illustrated in  FIG. 35 . Moreover, the distributor  302  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     In  FIG. 35 , an internal structure of the outer pipe  10  is shown by removing the front of the outer pipe  10 . As shown in  FIG. 35 , a plurality of partition plates  21  are installed in the inner pipe  20  or the outer pipe  10 , defining a plurality of distribution paths  22  accordingly. In the twentieth embodiment of the disclosure, the plurality of partition plates  21  may be installed at a twisted angle to the center shaft of the inner pipe  20 . In  FIG. 35 , of the plurality of partition plates  21 , partition plates  21   a  to  21   g  (ends of the partition plates  21   a  to  21   g  on the side of the outer pipe  10 , in particular) are shown, and of the plurality of distribution paths  22 , distribution paths  22   a  to  22   g  are shown. Although it is assumed herein that the plurality of partition plates  21  are installed at a twisted angle to the center shaft of the inner pipe  20 , they may also be said as being installed along the shaft of the inner pipe  20 , i.e., the shaft of the outer pipe  10 , in which case the plurality of partition plates  21  are an example of a plurality of partitions installed along the shaft of the outer pipe. Or, it is an example of a plurality of partitions defining a plurality of distribution paths between the outer pipe and the inner pipe. 
     Furthermore, in  FIG. 35 , the orifice plate  40  may have a plurality of orifice holes through which to allow the refrigerant to flow into the plurality of distribution paths  22 . 
     The plurality of branched pipes  60  may be linked to the plurality of distribution paths  22 . In  FIG. 35 , the branched pipes  60   a  to  60   g  linked to the distribution paths  22   a  to  22   g  are shown as the plurality of branched pipes  60 . 
     This structure may be understood as an example of a structure in which neighboring first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   b  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   b  correspond to the first and second distribution paths and the partition plate  21   a  corresponds to the one of the plurality of partitions. 
     Furthermore, in this structure, the first and second branched pipes may not be adjacent to each other, and the first and second distribution paths may have at least one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   c  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   c  correspond to the first and second distribution paths and the partition plates  21   a  and  21   b  correspond to the at least one of the plurality of partitions. 
     Moreover, as shown in  FIG. 35 , in the twentieth embodiment of the disclosure, the distribution paths  22   a  to  22   g  are defined to have a certain twisted angle to the center shaft of the inner pipe  20 , so all the distribution paths  22   a  to  22   g  may turn around the inner pipe  20  once and pass through the right side of the inner pipe  20 . Accordingly, the branched pipes  60   a  to  60   g  may all extend to the right by being linked to the portions at which the distribution paths  22   a  to  22   g  pass through the right side of the inner pipe  20 . This structure may be understood as an example of a structure in which a plurality of partitions are installed to form a certain twisted angle to the shaft of the outer pipe. 
     There may be one set of branched pipes  60   a  to  60   g , although in the twentieth embodiment of the disclosure, there may be a multiple sets of branched pipes  60   a  to  60   g  installed in parallel. The structure as in the twentieth embodiment of the disclosure may be understood as an example of a structure that includes at least two branched pipes connected to one of the plurality of distribution paths. 
     The perspective view of the refrigerant upstream end of the distributor  302  in  FIG. 35  is similar to that of  FIG. 33A or 34A . The B-B cross-sectional view of the distributor  302  of  FIG. 35  is similar to what is shown in  FIG. 33B or 34B . 
     An overall structure of a distributor  303  according to the twenty first embodiment of the disclosure is similar to that in  FIG. 32 or 35 . The distributor  303  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  303 . Furthermore, the distributor  303  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. The inner pipe  20  is also shown as having the shape of a cylinder, but it may have no hollow, in which case the inner pipe  20  is an example of an inner shaft installed in the outer pipe  10 . Moreover, the distributor  303  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     A plurality of partition plates  21  may be installed in the inner pipe  20  or the outer pipe  10 , defining a plurality of distribution paths  22  accordingly. 
       FIGS. 36A and 36B  are cross-sectional views of the distributor  303 , according to the twenty first embodiment of the disclosure. The cross-sectional views show a case that the plurality of partition plates  21  are installed in the inner pipe  20 . 
       FIG. 36A  illustrates a B-B cross-sectional view of the distributor  303 , according to the twenty first embodiment of the disclosure. The partition plates  21   a  to  21   g  may be installed integrally with the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer side of the inner pipe  20  and the center portion of the inner pipe  20 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer side of the inner pipe  20  to the center portion. Furthermore, the partition plates  21   a  to  21   g  are bonded to the outer pipe  10  with a substance  25   a  to  25   g . The substance  25   a  to  25   g  may be e.g., an adhesive without being limited thereto. The substance  25   a  to  25   g  may be any heterogeneous material different from material(s) of the outer pipe  10  and the inner pipe  20 . Furthermore, in the twenty first embodiment of the disclosure, the outer pipe  10  is subject to a recess process at locations corresponding to the distribution paths  22   a  to  22   g  on the dashed line of the refrigerant upstream end. Accordingly, recesses  11   a  to  11   g , i.e., concave portions, may be formed from the outer surface of the outer pipe  10 , and may serve as projections, i.e., convex portions into the distribution paths  22   a  to  22   g . The B-B line (or B-B location) is an example of a first location of an open end of the outer pipe, and may include any location from the inlet of the distribution path  22  to the branched pipe  60  on the utmost refrigerant upstream side. 
       FIG. 36B  illustrates a C-C cross-sectional view of the distributor  303 , according to the twenty first embodiment of the disclosure. Referring to  FIG. 36B , the orifice plate  43  may be installed along the C-C line (or C-C location) of the distributor  303 , which may have a plurality of orifice holes  431  through which to allow the refrigerant to flow into the plurality of distribution paths  22 . In  FIG. 36B , as the plurality of orifice holes  431 , orifice holes  431   a  to  431   g  through which to allow the refrigerant to flow into the plurality of distribution paths  22   a  to  22   g , respectively, are shown. The orifice holes  431   a  to  431   g  are an example of the plurality of orifice holes corresponding to the plurality of distribution paths. The C-C line is an example of a second location of a portion other than the end of the outer pipe, and the second location may include any location between the branched pipe  60  on the utmost refrigerant downstream side among the branched pipes  60  included in a set and the branched pipe  60  on the utmost refrigerant upstream side among the branched pipes  60  included in a set next to the former set on the downstream side. Alternatively, the location may be selected in the plural number, at which to install the orifice plate  43  or perform a recess process. 
     In the twenty first embodiment of the disclosure, the distributor  303  may have the orifice plate  43  shown in  FIG. 36B  installed along the B-B line and may be subject to the recess process as shown in  FIG. 36A  along the line C-C. The B-B line is an example of a first location of an open end of the outer pipe, and may include any location from the inlet of the distribution path  22  to the branched pipe  60  on the utmost refrigerant upstream side. Furthermore, the C-C line is an example of a second location of a portion other than the end of the outer pipe, and the second location may include any location between the branched pipe  60  on the utmost refrigerant downstream side among the branched pipes  60  included in a set and the branched pipe  60  on the utmost refrigerant upstream side among the branched pipes  60  included in a set next to the former set on the downstream side. Alternatively, the location may be selected in the plural number, at which to install the orifice plate  43  or perform a recess process. 
     Even in the twenty first embodiment of the disclosure, the plurality of partition plates  21  may be installed integrally with the outer pipe  10 . In this case, a cross-sectional view at a location of the distributor  303  at which the recess process is performed is similar to that of  FIG. 34B . 
     As described above, in the twenty first embodiment of the disclosure, the recess process may be performed on the refrigerant upstream end of the outer pipe  10  and the orifice plate  40  may be installed across the distribution paths  22  on the refrigerant downstream side. Alternatively, the orifice plate  40  may be installed at the refrigerant upstream end of the distribution path  22  and the recess process may be performed on the outer pipe  10  on the refrigerant downstream side. Accordingly, heat exchange capability may be increased by adjusting a refrigerant flow in the distribution path  22 . 
       FIG. 37  illustrates an overall structure of a distributor  304 , according to a twenty second embodiment of the disclosure. The distributor  304  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  304 . Furthermore, as shown in  FIG. 37 , the distributor  304  may include an outer pipe  10  in the form of a cylinder, an inner pipe  20  installed in the outer pipe  10 , and an orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. The inner pipe  20  is also shown as having the shape of a cylinder, but it may have no hollow, in which case the inner pipe  20  is an example of an inner shaft installed in the outer pipe  10 . Furthermore, the distributor  304  may include the inlet  30  e.g., welded to the refrigerant upstream end of the outer pipe  10  to guide the refrigerant, and the cap  50  e.g., welded to an end opposite to the refrigerant upstream end of the outer pipe  10 . The inlet  30  is installed outside the orifice plate  40 , so the orifice plate  40  is not visible from outside even though the orifice plate  40  is illustrated in  FIG. 37 . Moreover, the distributor  304  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     In  FIG. 37 , an internal structure of the inner pipe  20  is shown by removing the front of the outer pipe  10 . As shown in  FIG. 37 , the plurality of partition plates  21  are installed in the inner pipe  20  or the outer pipe  10 , defining a plurality of distribution paths  22  accordingly. In the twenty second embodiment of the disclosure, the plurality of partition plates  21  may be formed at a small twisted angle to the center shaft of the inner pipe  20  in a refrigerant upstream range R 5  and at a large twisted angle to the center shaft of the inner pipe  20  in a refrigerant downstream range R 6 . In  FIG. 37 , of the plurality of partition plates  21 , partition plates  21   a  to  21   g  (ends of the partition plates  21   a  to  21   g  on the side of the outer pipe  10 , in particular) are shown, and of the plurality of distribution paths  22 , distribution paths  22   a  to  22   g  are shown. Although it is assumed herein that the plurality of partition plates  21  are installed at a twisted angle to the center shaft of the outer pipe  10 , they may also be said as being installed along the shaft of the inner pipe  20 , i.e., the shaft of the outer pipe  10 , in which case the plurality of partition plates  21  are an example of a plurality of partitions installed along the shaft of the outer pipe. Or, it is an example of a plurality of partitions defining a plurality of distribution paths between the outer pipe and the inner pipe. 
     Furthermore, in  FIG. 37 , the orifice plate  40  may have a plurality of orifice holes through which to allow the refrigerant to flow into the plurality of distribution paths  22 . 
     The plurality of branched pipes  60  may be linked to the plurality of distribution paths  22 . In  FIG. 37 , the branched pipes  60   a  to  60   g  linked to the distribution paths  22   a  to  22   g  are shown as the plurality of branched pipes  60 . 
     This structure may be understood as an example of a structure in which neighboring first and second branched pipes of the plurality of branched pipes are connected to first and second distribution paths of the plurality of distribution paths, the first and second distribution paths having one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   b  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   b  correspond to the first and second distribution paths and the partition plate  21   a  corresponds to the one of the plurality of partitions. 
     Furthermore, in this structure, the first and second branched pipes may not be adjacent to each other, and the first and second distribution paths may have at least one of the plurality of partitions in between them. In this case, by putting the branched pipes  60   a  and  60   c  to the first and second branched pipes as an example, the distribution paths  22   a  and  22   c  correspond to the first and second distribution paths and the partition plates  21   a  and  21   b  correspond to the at least one of the plurality of partitions. 
     Moreover, as shown in  FIG. 35 , in the twenty second embodiment of the disclosure, the distribution paths  22   a  to  22   g  are defined to have a twisted angle to the center shaft of the inner pipe  20 , so all the distribution paths  22   a  to  22   g  may turn around the inner pipe  20  once and pass through the right side of the inner pipe  20 . Accordingly, the branched pipes  60   a  to  60   g  may all extend to the right by being linked to the portions at which the distribution paths  22   a  to  22   g  pass through the right side of the inner pipe  20 . This structure may be understood as an example of a structure in which a plurality of partitions are installed to form a twisted angle to the shaft of the outer pipe. 
     There may be one set of branched pipes  60   a  to  60   g , although in the twenty second embodiment of the disclosure, there may be a multiple sets of branched pipes  60   a  to  60   g  installed in parallel. The structure as in the twenty second embodiment of the disclosure may be understood as an example of a structure that includes at least two branched pipes connected to one of the plurality of distribution paths. 
       FIGS. 38A and 38B  are partially enlarged views of the distributor  304 , according to the twenty second embodiment of the disclosure. 
     In  FIG. 38A , an enlarged view of a portion of the range R 5  of  FIG. 37  is illustrated. In this enlarged view, the partition plates  21  are formed at a twisted angle θ 1  to the inner pipe  20 . In  FIG. 38B , an enlarged view of a portion of the range R 6  of  FIG. 37  is illustrated. In this enlarged view, the partition plates  21  are formed at a twisted angle θ 2  (θ 1 &lt;θ 2 ) to the inner pipe  20 . 
     Although the twisted angle in the range R 5  of  FIG. 37  is θ 1  and twisted angle in the range R 6  of  FIG. 37  is θ 1  (θ 1 &lt;θ 2 ), they are not limited thereto. 
     For example, when more refrigerant flow is required to flow into the branched pipes  60  on the refrigerant upstream side, the twisted angle θ 1  in the range R 5  of  FIG. 37  and the twisted angle θ 2  in the range R 6  of  FIG. 37  may satisfy a condition of θ 1 &gt;θ 2 . That is, the twisted angles θ 1  and θ 2  may have different values. Assuming that the ranges R 5  and R 6  correspond to first and second ranges, respectively, in the axial direction of the outer pipe, the twisted angles θ 1  and θ 2  correspond to an example of first and second twisted angles, respectively. 
     Furthermore, even in the twenty second embodiment of the disclosure, when the partition plates  21   a  to  21   g  are installed integrally with the inner pipe  20 , the partition plates  21   a  to  21   g  may be bonded to the outer pipe  10  with the substance  25   a  to  25   g . Alternatively, when the partition plates  21   a  to  21   g  are installed integrally with the outer pipe  10 , the partition plates  21   a  to  21   g  may be bonded to the inner pipe  20  with the substance  25   a  to  25   g.    
     As described above, in the twenty second embodiment of the disclosure, the twisted angles of the partition plates  21  against the inner pipe  20  differ between the refrigerant upstream side and the refrigerant downstream side. Accordingly, heat exchange capability may be increased by changing a refrigerant pressure loss of the distribution path  22  and adjusting a refrigerant flow in the distribution path  22 . 
     An overall structure of a distributor  305  according to the twenty third embodiment of the disclosure is similar to that in  FIG. 32 or 35 . The distributor  305  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  305 . Furthermore, the distributor  305  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. The inner pipe  20  is also shown as having the shape of a cylinder, but it may have no hollow, in which case the inner pipe  20  is an example of an inner shaft installed in the outer pipe  10 . Moreover, the distributor  305  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     A plurality of partition plates  21  are installed in the inner pipe  20  or the outer pipe  10 , defining a plurality of distribution paths  22  accordingly. 
       FIGS. 39A and 39B  are cross-sectional views of the distributor  305 , according to the twenty third embodiment of the disclosure. The cross-sectional views show a case that the plurality of partition plates  21  are installed in the inner pipe  20 .  FIG. 39A  illustrates a B-B cross-sectional view of the distributor  305  and  FIG. 39B  illustrates a C-C cross-sectional view of the distributor  305 , in the twenty third embodiment of the disclosure. The partition plates  21   a  to  21   g  may be installed integrally with the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer side of the inner pipe  20  and the center portion of the inner pipe  20 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer side of the inner pipe  20  to the center portion. Furthermore, the partition plates  21   a  to  21   g  are bonded to the outer pipe  10  with a substance  25   a  to  25   g . The substance  25   a  to  25   g  may be e.g., an adhesive without being limited thereto. The substance  25   a  to  25   g  may be any heterogeneous material different from material(s) of the outer pipe  10  and the inner pipe  20 . While the partition plates  21   a  to  21   g  are not subject to a rib process on their surfaces in  FIG. 39A  and thus have no ribs, the partition plates  21   a  to  21   g  is subject to the rib process on their surfaces and have ribs  26   a  to  26   g  in  FIG. 39B . 
     In other words, no rib is formed on the partition plates  21   a  to  21   g  along the B-B line of  FIG. 32 or 35  and ribs  26   a  to  26   g  are formed on the partition plates  21   a  to  21   g  along the C-C line of  FIG. 32 or 35 , without being limited thereto. 
     For example, no rib may be formed on the partition plates  21   a  to  21   g  at any location in the range R 3  of  FIG. 32 or 35 , but ribs  26   a  to  26   g  may be formed on the partition plates  21   a  to  21   g  at any location in the range R 4  of  FIG. 32 or 35 . The range R 3  is an example of a first range, and the range R 4  is an example of a second range. 
     In another example, when more refrigerant is required to flow into the branched pipe  60  on the refrigerant upstream side, the ribs  26   a  to  26   b  may be formed on the partition plates  21   a  to  21   g  in the range R 3  of  FIG. 32 or 35  while no rib may be formed on the partition plates  21   a  to  21   g  in the range R 4  of  FIG. 32 or 35 . 
     Although the partition plates  21   a  to  21   g  are installed integrally with the inner pipe  20  in the above embodiment of the disclosure, it is not limited thereto. For example, the partition plates  21   a  to  21   g  may be installed integrally with the outer pipe  10 . In this case, the partition plates  21   a  to  21   g  may be bonded to the inner pipe  20  with the substance  25   a  to  25   g.    
     As described above, in the twenty third embodiment of the disclosure, the partition plates  21   a  to  21   g  have a portion with the ribs  26   a  to  26   g  formed therein and another portion without ribs. The ribs  26   a  to  26   g  formed in the distribution paths  22   a  to  22   g  may facilitate gas-liquid mixing. Accordingly, heat exchange capability may be increased by uniformly distributing the gas-liquid refrigerant into the plurality of branched pipes  60 . 
     An overall structure of a distributor  306  according to the twenty fourth embodiment of the disclosure is similar to that in  FIG. 32 or 35 . The distributor  306  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  306 . Furthermore, the distributor  306  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped main pipe. The inner pipe  20  is also shown as having the shape of a cylinder, but it may have no hollow, in which case the inner pipe  20  is an example of an inner shaft installed in the outer pipe  10 . Moreover, the distributor  306  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     A plurality of partition plates  21  are installed in the inner pipe  20  or the outer pipe  10 , defining a plurality of distribution paths  22  accordingly. 
       FIGS. 40A and 40B  are cross-sectional views of the distributor  306 , according to the twenty fourth embodiment of the disclosure. The cross-sectional views show a case that the plurality of partition plates  21  are installed in the inner pipe  20 .  FIG. 40A  illustrates a B-B cross-sectional view of the distributor  306  and  FIG. 40B  illustrates a C-C cross-sectional view of the distributor  306 , in the twenty fourth embodiment of the disclosure. The partition plates  21   a  to  21   g  may be installed integrally with the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer side of the inner pipe  20  and the center portion of the inner pipe  20 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer side of the inner pipe  20  to the center portion. Furthermore, the partition plates  21   a  to  21   g  are bonded to the outer pipe  10  with a substance  25   a  to  25   g . The substance  25   a  to  25   g  may be e.g., an adhesive without being limited thereto. The substance  25   a  to  25   g  may be any heterogeneous material different from material(s) of the outer pipe  10  and the inner pipe  20 . The partition plates  21   a  to  21   g  have plate thickness of t 1  in  FIG. 40A , but have plate thickness of t 2  (t 1 &lt;t 2 ) in  FIG. 40B . 
     In other words, the partition plates  21   a  to  21   g  have plate thickness of t 1  along the B-B line of  FIG. 32 or 35  and t 2  (t 1 &lt;t 2 ) along the C-C line of  FIG. 32 or 35 , without being limited thereto. 
     In other words, the partition plates  21   a  to  21   g  have plate thickness of t 1  at any location in the range R 3  of  FIG. 32 or 35  and t 2  (t 1 &lt;t 2 ) at any location in the range R 4  of  FIG. 32 or 35 , without being limited thereto. In yet another example, a plurality of ranges may be set for corresponding sets of branched pipes  60 , and the partition plates  21   a  to  21   g  in each range may have plate thickness that increases stepwise from the refrigerant upstream side to the refrigerant downstream side. Furthermore, the plate thickness of the partition plates  21   a  to  21   g  may continuously increase from the refrigerant upstream side to the refrigerant downstream side. 
     Alternatively, when more refrigerant is required to flow into the branched pipes  60  on the refrigerant upstream side, the plate thickness t 1  of the partition plate  21   a  to  21   g  along the B-B line of  FIG. 32 or 35  and the plate thickness t 2  of the partition plate  21   a  to  21   g  along the C-C line of  FIG. 32 or 35  may satisfy a condition of t 1 &gt;t 2 . That is, the plate thickness t 1  and t 2  may have different values. Assuming that the B-B and C-C lines are an example of first and second locations in the axial direction of the outer pipe, the plate thickness t 1  corresponds to first thickness and the plate thickness t 2  corresponds to second thickness. Even in this case, the plate thickness of the partition plates  21   a  to  21   g  may be changed stepwise or continuously. 
     Although the partition plates  21   a  to  21   g  are installed integrally with the inner pipe  20  in the above embodiment of the disclosure, it is not limited thereto. For example, the partition plates  21   a  to  21   g  may be installed integrally with the outer pipe  10 . In this case, the partition plates  21   a  to  21   g  may be bonded to the inner pipe  20  with the substance  25   a  to  25   g.    
     As described above, in the twenty fourth embodiment of the disclosure, the plate thickness of the partition plates  21  differs between the refrigerant upstream side and the refrigerant downstream side. For example, the plate thickness of the partition plate  21  may be thin on the refrigerant upstream side and thick on the refrigerant upstream side. The refrigerant flow slows down in the refrigerant downstream in the distribution path  22 , but the heat exchange capability may be increased because of uniform distribution of the gas-liquid refrigerant to the branched pipes  60  on the refrigerant downstream side without reducing the fluid velocity. 
     An overall structure of a distributor  307  according to the twenty fifth embodiment of the disclosure is similar to that in  FIG. 32 or 35 . The distributor  307  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  307 . Furthermore, the distributor  307  may include the outer pipe  10  in the form of a cylinder, the inner pipe  20  installed in the outer pipe  10 , and the orifice plate  40  installed at a refrigerant upstream end of the inner pipe  20 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped outer pipe. The inner pipe  20  is also shown as having the shape of a cylinder, but it may have no hollow, in which case the inner pipe  20  is an example of an inner shaft installed in the outer pipe  10 . Moreover, the distributor  307  may include a plurality of branched pipes  60  fixed in the refrigerant downstream and connected to refrigerant pipes of a heat exchanger. 
     A plurality of partition plates  21  are installed in the inner pipe  20  or the outer pipe  10 , defining a plurality of distribution paths  22  accordingly. 
       FIG. 41  illustrates a cross-sectional view along line A-A of the distributor  307 , according to the twenty fifth embodiment of the disclosure. The cross-sectional view shows a case that the plurality of partition plates  21  are installed in the inner pipe  20 . The partition plates  21   a  to  21   g  may be installed integrally with the inner pipe  20 , defining the plurality of distribution paths  22   a  to  22   g  accordingly. The partition plates  21  connect the outer side of the inner pipe  20  and the center portion of the inner pipe  20 , so that the width of the distribution path  22  between the partition plates  21  decreases as it goes from the outer side of the inner pipe  20  to the center portion. Furthermore, the partition plates  21   a  to  21   g  are bonded to the outer pipe  10  with a substance  25   a  to  25   g . The substance  25   a  to  25   g  may be e.g., an adhesive without being limited thereto. The substance  25   a  to  25   g  may be any heterogeneous material different from material(s) of the outer pipe  10  and the inner pipe  20 . In  FIG. 41 , the branched pipe  60   a  linked and fixed to the distribution path  22   a  is inserted between the partition plates  21   a  and  21   g  that define the distribution path  22   a . In this embodiment of the disclosure, side holes  66   a  and  67   a  through which to allow the refrigerant to flow in may be formed at the branched pipe  60   a . Furthermore, in the twenty fifth embodiment of the disclosure, the diameter of the side holes  66   a  and  67   a  may differ among the multiple branched pipes  60   a  (three branched pipes  60   a  in  FIG. 32 or 35 ). Although the branched pipe  60   a  linked to the distribution path  22   a  is shown because  FIG. 41  is an A-A cross-sectional view of  FIG. 32 or 35 , what are described above in connection with the branched pipe  60   a  may be equally applied to the other branched pipes  60   b  to  60   g  linked to the distribution paths  22   a  to  22   g.    
     The branched pipe  60   a  has the side holes  66   a  and  67   a  formed thereat, without being limited thereto. For example, a front hole through which to allow the refrigerant to flow in may be formed at the branched pipe  60   a  on the front in the direction of insertion to the distribution path  22   a . The front hole is different from a hole at the axial part  62   a  in the first or second embodiment of the disclosure in that the front hole is formed without shrinking the branched pipe  60   a . The side holes  66   a  and  67   a  and the front hole are an example of holes formed on any side of a portion inserted to one distribution path. 
     Although the partition plates  21   a  to  21   g  are installed integrally with the inner pipe  20  in the above embodiment of the disclosure, it is not limited thereto. For example, the partition plates  21   a  to  21   g  may be installed integrally with the outer pipe  10 . In this case, the partition plates  21   a  to  21   g  may be bonded to the inner pipe  20  with the substance  25   a  to  25   g.    
     As described above, in the twenty fifth embodiment of the disclosure, a hole (or holes) through which to allow the refrigerant to flow in may be formed on a side of a portion of the distributor  307  inserted to the distribution path  22 , and the diameter of the hole differs between the refrigerant upstream side and the refrigerant downstream side. Accordingly, refrigerant flow distribution may be adjusted, thereby increasing heat exchange capability. 
       FIG. 42  illustrates an overall structure of a heat exchange unit including a distributor  308  and the heat exchanger  8 , according to a twenty sixth embodiment of the disclosure. 
     An overall structure of the distributor  308  included in the heat exchange unit according to the thirteenth embodiment of the disclosure is similar to that in  FIG. 32 or 35 . The distributor  308  is also to distribute a refrigerant as an example of a fluid that passes in the distributor  308 . Furthermore, the distributor  308  may include an outer pipe  10  in the form of a cylinder, and an inner pipe  20  installed in the outer pipe  10 . The outer pipe  10  is shown as having the shape of a cylinder as an example, but it may have the form of a barrel, in which case the outer pipe  10  is an example of a barrel-shaped outer pipe. The inner pipe  20  is also shown as having the shape of a cylinder, but it may have no hollow, in which case the inner pipe  20  is an example of an inner shaft installed in the outer pipe  10 . 
     A plurality of partition plates  21  are installed in the inner pipe  20  or the outer pipe  10 , defining a plurality of distribution paths  22  accordingly. 
     The heat exchanger  8  included in the heat exchange unit in the twenty sixth embodiment of the disclosure performs heat exchange between the refrigerant as an example of a fluid distributed by the distributor  308  and air. The heat exchanger  8  may include a plurality of fins  81  vertically arranged in parallel at preset intervals, a plurality of refrigerant pipes  82  as an example of a plurality of fluid pipes installed in parallel to pass through holes of the fins  81 , a header  83  at which the refrigerant flowing from each of the plurality of refrigerant pipes  82  joins, and an external connection pipe  84  through which to exhaust the refrigerant from the header  83 . 
     The plurality of branched pipes  60  of the distributor  308  may connect to the plurality of refrigerant pipes  82  of the heat exchanger  8  one to one. 
     As described above, in the twenty sixth embodiment of the disclosure, the refrigerant flow resistance may be changed in the single distribution path  22  while the plurality of partition plates  21  are integrated with the inner pipe  20  or the outer pipe  10 . Accordingly, refrigerant flow distribution may be adjusted while preventing a refrigerant leak, thereby increasing heat exchange capability. 
     According to the disclosure, a distributor may be kept compact even when the number of branched pipes connected to a main pipe is increased. 
     According to the disclosure, the possibility of worsening fluid distribution characteristics due to unequal distribution of a fluid into the plurality of distribution paths may be reduced. 
     Furthermore, according to the disclosure, the possibility of worsening fluid distribution characteristics due to occurrence of a fluid leak between the outer pipe and the plurality of partitions or between the inner shaft and the plurality of partitions may be reduced. 
     Although the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. It is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claim.