Patent Publication Number: US-2018030984-A1

Title: Package-type fluid machine

Description:
TECHNICAL FIELD 
     The present disclosure relates to a package type fluid machine including a fluid machine unit installed in a housing. 
     BACKGROUND ART 
     As described in Patent Document 1, there is known a package type fluid machine in which a plurality of compressor units is stacked and the compressor units are housed in a housing. In this machine, a pulley is provided for each of a compressor main body and a motor, and power of the motor is transmitted to the compressor main body by a belt which connects the pulleys. A sirocco fan is built in the compressor main body. Ventilating air is sucked by the sirocco fan, and the compressor main body is cooled. 
     In the apparatus described in Patent Document 1, a pair of stacking units is disposed to face each other on the right and left sides. The compressor main body of one unit and the motor of the other unit are disposed to face each other, and an intake port is provided in a portion of the housing facing the motor. Furthermore, a main exhaust port is provided above the pair of stacking units disposed to face each other. Meanwhile, cooling air passing through the motor, the compressor main body and an after-cooler in this order is collected in the exhaust duct. A main exhaust port and an exhaust duct exhaust port are separately provided on a top plate of the housing. 
     CITATION LIST 
     Patent Literature 
     Patent Document 1: Japanese Unexamined Patent Publication No. 2014-211119 
     SUMMARY OF INVENTION 
     Technical Problem 
     For example, when a package type fluid machine is installed in a room, it is necessary to perform ventilation in order to suppress the temperature rise in the room. For example, in a small compressor, it is possible to ventilate the entire room with a relatively small ventilation fan. Meanwhile, in a medium-sized or large-sized compressor, a large-sized ventilation fan is required to ventilate the entire room. Therefore, a method is considered in which a duct is provided in the vicinity of the exhaust port of the package type fluid machine and a ventilation fan is provided in the duct to discharge the gas inside the housing to the outside of the room. 
     When a plurality of exhaust ports is scattered on the top plate (a ceiling portion) of the housing as in the aforementioned conventional package type fluid machine, since it is necessary to prepare a duct that covers the entire ceiling portion, the size of the duct increases. In addition, since sound generated from the compressor tends to leak from the intake port or the exhaust port, the sound inside the housing leaks to the outside, which may cause a noise. 
     The present disclosure describes a package type fluid machine capable of reducing the size of the duct that can be mounted for exhaust and also reducing noise. 
     Solution to Problem 
     An aspect of the present invention is a package type fluid machine including a plurality of fluid machine units installed in a housing, the machine including: at least one intake port which is provided in the housing and communicates with an installation region of the plurality of fluid machine units to allow a cooling gas to flow therein; a plurality of exhaust paths which is provided inside the housing, and includes a first exhaust path which allows gas passed through the fluid machine of the plurality of fluid machine units to flow, and a second exhaust path different from the first exhaust path; and a single exhaust port which is provided in the housing, communicates with downstream end portions of the plurality of exhaust paths, and collects and discharges the gas flowed through the plurality of exhaust paths. 
     According to the package type fluid machine, the cooling gas flowing into the housing from the intake port passes through the fluid machine of the plurality of compressor units and circulates through the first exhaust path. Further, the other part of the gas circulates through the second exhaust path different from the first exhaust path. Further, the gas circulating through the plurality of exhaust paths including the first exhaust path and the second exhaust path is collected and discharged to the outside of the housing from the single exhaust port. In this way, since the exhaust ports are collectively provided, the exhaust ports are not scattered. Therefore, for example, even when a package type fluid machine is installed in a room and a duct is provided in the vicinity of the exhaust port, the duct can be reduced in size. Further, since sound generated by the compressor main body or the like is suppressed from leaking from the exhaust port, it is possible to reduce noise. 
     The housing may have a plurality of side plate portions and a single top plate portion, and the exhaust port may be provided on the top plate portion. In this case, the exhaust ports are collectively provided on the top plate portion. Therefore, it is possible to reduce the size of the duct which can be provided in the vicinity of the top plate portion. 
     The package type fluid machine may further include a first stacking unit and a second stacking unit in which the fluid machine units are stacked in each of a first installation region and a second installation region respectively, the first installation region and the second installation region being adjacent to each other in a horizontal direction within the housing, the top plate portion may cover the first stacking unit and the second stacking unit from above, and the exhaust port of the top plate portion may be provided above an intermediate position between the first stacking unit and the second stacking unit. In this case, the distance from the first installation region to the exhaust port and the distance from the second installation region to the exhaust port can be made to be substantially equal to each other. Therefore, gas from the first stacking unit and gas from the second stacking unit can be discharged from the exhaust port in a well-balanced manner 
     Effects of Invention 
     According to some aspects of the present invention, it is possible to reduce the size of the duct that can be attached for exhaust and furthermore, it is possible to reduce noise. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a package type fluid machine according to an embodiment of the present invention. 
         FIG. 2  is a perspective view of the package type fluid machine of  FIG. 1  as viewed from the rear side. 
         FIG. 3  is a plane sectional view illustrating an inflow path of cooling gas. 
         FIG. 4  is a perspective view illustrating first and second stacking units. 
         FIG. 5( a )  is a cross-sectional view illustrating an exhaust path in the first stacking unit, and  FIG. 5( b )  is a cross-sectional view illustrating an exhaust path in the second stacking unit. 
         FIG. 6  is a perspective view illustrating a flow of a gas at downstream end portions of a plurality of exhaust paths. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, a package type fluid machine having a plurality of compressor units will be described, but the present invention is also applicable to a machine other than the compressor. For example, as the fluid machine, a pump such as a vacuum pump or the like may be used or a blower or the like may be used. In these cases, a motor can be used as a driving source, but a driving source other than the motor may be used. Further, as a fluid machine, an expander or the like may be used. A generator may be connected to the expander. 
       FIGS. 1 and 2  are perspective views illustrating a package type fluid machine  1  according to this embodiment. As illustrated in  FIGS. 1 and 2 , the package type fluid machine  1  includes a plurality of compressor units (fluid machine units)  3  installed in a housing  2 . The package type fluid machine  1  includes, for example, six compressor units  3 . The housing  2  is made of, for example, a steel plate. The housing  2  having a rectangular parallelepiped shape has a frame  4  serving as a base of the package type fluid machine  1 , a front plate (side plate portion)  5 , a pair of side plates (side plate portion)  6 , and a rear plate (side plate portion)  7 . 
     At the center of the front plate  5  in a width direction, a vertically elongated inspection door  5   a  is provided. The front plate  5 , the side plate  6 , and the rear plate  7  may be made of separate plate members, or the plates may be integrally formed. For example, the corner portions may be integrated. The housing  2  includes a top plate (top plate portion)  8  which closes the openings of the upper surfaces of the front plate  5 , the side plate  6  and the rear plate  7 . In this way, the housing  2  has a plurality of side plate portions and one top plate portion. In the package type fluid machine  1 , one vertically elongated intake port  10  for introducing cooling air (gas) is provided at the center of the rear plate  7  in the width direction (see  FIG. 2 ). 
     As illustrated in  FIG. 3 , the compressor unit  3  includes a motor  14  serving as a driving source, and a compressor main body  16  serving as a fluid machine. A belt  17  is laid between a pulley  14   a  provided in the motor  14  and a pulley  16   a  provided in the compressor main body  16 . The compressor main body  16  is, for example, a scroll type compressor. The motor  14  and the compressor main body  16  are disposed to be lined up in a front-rear direction. In this case, the belt  17  is laid along the front-rear direction. 
     As illustrated in  FIGS. 1 and 2 , the package type fluid machine  1  includes a first stacking unit  11  including a plurality of (for example, three) compressor units  3 , and a second stacking unit  12  including the compressor units  3  having the same number (for example, three) as the first stacking unit  11 . Hereinafter, the first stacking unit  11  and the second stacking unit  12  are abbreviated as a stacking unit  11  and a stacking unit  12 . The stacking unit  11  is stacked in an installation region (first installation region) R 1  close to one side plate  6 . The stacking unit  12  is stacked in an installation region (second installation region) R 2  close to the other side plate  6 . The installation region R 1  and the installation region R 2  are adjacent to each other in the left-right direction (a direction in which the side plates  6  face each other, that is, a horizontal direction orthogonal to the front-rear direction). The stacking unit  11  has a rack  11  a of a three-stage configuration for installing the three compressor units  3 . The stacking unit  12  has a rack  12   a  of a three-stage configuration for installing the three compressor units  3 . 
     The rack  11   a  and the rack  12   a  are fixed on the frame  4 . A compressor unit  3  including a motor  14  and a compressor main body  16  is fixed on each stage of the rack  11  a and the rack  12   a.  The stacking unit  11  and the stacking unit  12  are disposed side by side to be spaced apart from each other in the left-right direction (see  FIG. 3 ). More specifically, the compressor unit  3  in each stage of the stacking unit  11  and the compressor unit  3  in each stage of the stacking unit  12  are provided at the same height, and face each other in the left-right direction. In the stacking unit  11  and the stacking unit  12 , the compressor units  3  are disposed to face each other so that the belt  17  of the compressor unit  3  is disposed on the inner side. The compressor main body  16  of the stacking unit  12  faces the motor  14  of the stacking unit  11 , and the motor  14  of the stacking unit  12  faces the compressor main body  16  of the stacking unit  11 . 
     As illustrated in  FIG. 3 , between the stacking unit  11  and the stacking unit  12 , that is, between the installation region R 1  and the installation region R 2 , a central space S extending in the front-rear direction and the up-down direction is formed. A partition wall  13  (see  FIG. 6 ) extending along the horizontal plane is provided above the central space S at a position equal to the upper ends of the installation regions R 1  and R 2 . The central space S is a space that can be used at the time of maintenance of the pulley  14   a,  the pulley  16   a,  the belt  17 , or the like. The central space S communicates with the intake port  10  of the rear plate  7 , and functions as an inflow path of the cooling air at the time of the use of the package type fluid machine  1 . That is, the rear plate  7  covers the stacking unit  11  and the stacking unit  12  adjacent to each other from rear, and at the intermediate positions thereof, the intake port  10  communicating with the central space S is provided. 
     As illustrated in  FIG. 4 , on the central space S side of the rack  11   a  of the stacking unit  11 , a rectangular partition wall  11   b  is provided to cover the entire inner side surfaces of the installation region R 1 . Similarly, on the central space S side of the rack  12   a  of the stacking unit  12 , a rectangular partition wall  12   b  is provided to cover the entire inner side surface of the installation region R 2 . On the partition wall  11   b  and the partition wall  12   b,  introduction ports  11   c  and  12   c  of the cooling air are provided at positions facing the motor  14  of the compressor unit  3 . The intake port  10  communicates with the installation region R 1  of the stacking unit  11  and the installation region R 2  of the stacking unit  12  via the introduction ports  11   c  and  12   c  and the central space S. 
     A rectangular partition wall  11   d  is provided on the front plate  5  side of the rack  11   a  of the stacking unit  11  to cover the front surface of the installation region R 1 . Similarly, a rectangular partition wall  12   d  is provided on the rear plate  7  side of the rack  12   a  of the stacking unit  12  to cover the rear surface of the installation region R 2 . The discharge ports  11   e  and  12   e  of air are provided on the partition wall  11   d  and the partition wall  12   d  at positions facing the compressor main body  16  of the compressor unit  3 . The discharge ports  11   e  and  12   e  are openings for discharging air which has become high-temperature by heat exchange with the compressor main body  16 . 
     As illustrated in  FIG. 3 , a sirocco fan  16   b  is provided in the compressor main body  16  of each compressor unit  3 . The sirocco fan  16   b  further sucks the air introduced into the installation regions R 1  and R 2  toward the compressor main body  16  side, and performs heat exchange between the compressor main body  16  and air. The high-temperature air sucked by the sirocco fan  16   b  is discharged through the discharge ports  11   e  and  12   e.    
     Between the partition wall  11   d  and the front plate  5 , a high-temperature exhaust path P 1  extending in the up-down direction is provided. Between the partition wall  12   d  and the rear plate  7 , a high-temperature exhaust path P 2  extending in the up-down direction is provided. An after-cooler  18  is installed at each position adjacent to the discharge ports  11   e  and  12   e,  and the after-coolers  18  are disposed inside the high-temperature exhaust paths P 1  and P 2 . The high-temperature exhaust paths P 1  and P 2  correspond to a first exhaust path through which the high-temperature air passed through the compressor main body  16  of the plurality of compressor units  3  flows. 
     As illustrated in  FIG. 1  and  FIG. 2 , an upper partition wall  11   f  extending along the horizontal plane is provided on the upper surface of the stacking unit  11  to close the upper surface of the installation region R 1 . An upper partition wall  12   f  extending along the horizontal plane is provided on the upper surface of the stacking unit  12  to close the upper surface of the installation region R 2 . The upper partition wall  11   f  and the upper partition wall  12   f  are disposed on the same plane as the partition wall  13  of the upper portion of the central space S (see  FIG. 6 ). A plurality of circular openings  19  is formed on the upper partition walls  11   f  and  12   f  at positions corresponding to the uppermost motor  14  (that is, right above the motor  14 ), and the exhaust fan is fixed to the openings  19 . In this way, the installation regions R 1  and R 2  correspond to the second exhaust path through which relatively low-temperature air passed through the motors  14  of the plurality of compressor units  3  flows. 
     As illustrated in  FIG. 5 , the high-temperature exhaust paths P 1  and P 2  serving as the first exhaust path, and the installation regions R 1  and R 2  serving as the second exhaust path are partitioned by partition walls  11   d  and  12   d,  and are different air paths. Both the high-temperature exhaust paths P 1  and P 2  and the installation regions R 1  and R 2  extend in the up-down direction, and their extending directions are parallel to each other. 
     As illustrated in  FIGS. 5 and 6 , the space of the upper end portion of the high-temperature exhaust paths P 1  and P 2  (downstream end portion), and the space of the upper end portion of the installation regions R 1  and R 2  (downstream end portion) communicate with each other. The communicating space Sa is a flat rectangular parallelepiped space formed by the upper end portion of the front plate  5 , the upper end portions of the pair of side plates  6 , the upper end portion of the rear plate  7 , and the top plate  8 . 
     Further, as illustrated in  FIGS. 1 and 2 , the top plate  8  is provided with one exhaust port  20  for collecting and discharging the air circulated through the plurality of exhaust paths. The exhaust port  20  is the only exhaust opening provided on the top plate  8 . The exhaust port  20  is provided in the rear portion of the central portion  8   a  extending in the front-rear direction, and the rear portions of the side portion  8   b  and the side portion  8   c  adjacent to the central portion  8   a . The central portion  8   a  is located above the central space S, the side portion  8   b  is located above the installation region R 1 , and the side portion  8   c  is located above the installation region R 2 . The exhaust port  20  communicates with the upper end portions of the high-temperature exhaust paths P 1  and P 2  and the upper end portions of the installation regions R 1  and R 2 . More specifically, the exhaust port  20  is provided above the intermediate position between the stacking unit  11  and the stacking unit  12  (that is, above the central space S) in the top plate  8 . Further, the exhaust port  20  is provided on the top plate  8  near the rear plate  7  provided with the intake port  10 . The region (area) in the top plate  8  provided with the exhaust port  20  is, for example, half or less of the entire top plate  8 . 
     According to the package type fluid machine  1  of the present embodiment described above, the cooling air flowing into the housing  2  from the intake port  10  passes through the compressor main body  16  of the plurality of compressor units  3  and circulates through the high-temperature exhaust paths P 1  and P 2 . The other part of the air circulates through the installation regions R 1  and R 2  different from the high-temperature exhaust paths P 1  and P 2 . Further, the air circulated through the high-temperature exhaust paths P 1  and P 2  and the installation regions R 1  and R 2  is collected and discharged to the outside of the housing  2  from the single exhaust port  20 . In this way, since the exhaust ports  20  are collectively provided, exhaust ports are not scattered. Therefore, for example, even when a package type fluid machine  1  is installed in a room and a duct is provided in the vicinity of the exhaust port  20 , the duct can be reduced in size. Further, since sound generated by the compressor main body  16  or the like is suppressed from leaking from the exhaust port  20 , it is possible to reduce noise. 
     Moreover, in the package type fluid machine  1 , since the exhaust port  20  is collectively provided on the top plate  8 , it is possible to reduce the size of the duct which can be provided in the vicinity of the top plate  8 . 
     Since the exhaust port  20  provided on the top plate  8  is provided above the intermediate position between the stacking unit  11  and the stacking unit  12 , the distance from the installation region R 1  to the exhaust port  20  and the distance from the installation region R 2  to the exhaust port  20  can be substantially equal to each other. Therefore, air from the stacking unit  11  and air from the stacking unit  12  can be discharged from the exhaust port  20  in a well-balanced manner 
     In addition, since a single intake port  10  communicating with a plurality of exhaust paths is provided behind the intermediate position between the stacking unit  11  and the stacking unit  12 , not only the exhaust port  20  but also the intake port  10  are collectively provided. 
     Therefore, it is possible to further reduce the noise. Further, since the intermediate region between the stacking unit  11  and the stacking unit  12  can be set as an inflow path of the cooling air (that is, the central space S), the space can be effectively utilized. 
     Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, the position of the exhaust port  20  may not be provided above the intermediate position between the first stacking unit  11  and the second stacking unit  12 . The exhaust port  20  may be disposed to be shifted to either the left or the right in the top plate  8 . 
     The position of the intake port  10  may not be provided behind the intermediate position between the first stacking unit  11  and the second stacking unit  12 . A plurality of intake ports  10  may be provided. 
     The present invention is not limited to an aspect in which the first stacking unit  11  is provided in the installation region R 1  and the second stacking unit  12  is provided in the installation region R 2 . An aspect in which only one stacking unit is included in the housing  2  may be provided. The exhaust port  20  may not be provided on the top plate  8 . An aspect in which the exhaust port  20  is provided on, for example, the side plate  6  or the like may be provided. A separate flow path different from the installation regions R 1  and R 2  may be provided as the second path. 
     INDUSTRIAL APPLICABILITY 
     According to some aspects of the present invention, it is possible to reduce the size of the duct that can be attached for exhaust and furthermore, it is possible to reduce noise. 
     REFERENCE SIGNS LIST 
       1  . . . Package type fluid machine,  2  . . . Housing,  3  . . . Compressor unit (fluid machine unit),  5  . . . Front plate (side plate portion),  6  . . . Side plate (side plate portion),  7  . . . Rear plate (side plate portion),  8  . . . Top plate (top plate portion),  10  . . . Intake port,  11  . . . First stacking unit,  12  . . . Second stacking unit,  16  . . . Compressor main body (fluid machine),  20  . . . Exhaust port, P 1 , P 2  . . . High-temperature exhaust path (first exhaust path), R 1 , R 2  . . . Installation region (second exhaust path).