Patent Publication Number: US-6334333-B1

Title: Condenser

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a condenser used in a refrigeration cycle in a vehicular air conditioner, for example. 
     In some of the condensers used in the refrigeration cycle, a reservoir tank, i.e. an accumulator, for storing the refrigerant liquefied by cooling is provided for one of the paired header pipes, and is given the function of a liquid tank, as disclosed in JP-A-8-35744 and JP-A-8-110125. 
     FIG. 11 is an exploded, perspective view showing a major portion of a conventional product that is disclosed in JP-A-8-35744. In the product, a flat portion B 1  with a flat surface B 2  is formed on a header pipe B that is one of the paired header pipes, and a flat portion C 1  with a flat surface C 2  is formed also on a reservoir tank C. A through-hole B 3  is formed in the flat portion B 1  of the header pipe B at a predetermined location. A through-hole C 3  having the same configuration as the through-hole B 3  of the header pipe B is formed also in the flat portion C 1  of the header pipe C at a predetermined location. 
     In the product, the through-hole B 3  of the header pipe B is aligned with the through-hole C 3  of the reservoir tank C, and the through-hole B 3  of the header pipe B is joined to the through-hole C 3  of the reservoir tank C by hard soldering, whereby the through-hole B 3  and the through-hole C 3  communicate the inside of the header pipe B with the inside of the reservoir tank C, and form a refrigerant passage D through which a refrigerant flows. 
     In the conventional product shown in FIG. 11, when the refrigerant leaks from a joining portion for forming the refrigerant passage D, the repair of the leakage requires hermetically sealing of the joining portion over its entire circumference by hard soldering, or the like. Since the refrigerant passage D is formed by joining together the flat surface B 2  of the header pipe B and the flat surface C 2  of the reservoir tank C, an area of the joining portion forming the refrigerant passage D is large, and the outer circumference of the joining portion is long. 
     Thus, when the refrigerant leaks from the joining portion forming the refrigerant passage D, much work is needed for its repair. In an extreme case, it is unavoidable to discard the condenser per se. 
     SUMMARY OF THE INVENTION 
     Accordingly, an object of the present invention is to provide a novel arrangement which enables easy work of repairing the refrigerant leakage from the joining portion forming the refrigerant passage when the leakage occurs. 
     To achieve the above-noted object, the present invention proposes the use of a connection member that is arranged to be attached to the reservoir tank and one of the heater pipes and to communicate the reservoir tank with the one of the header pipes. 
     A condenser according to the present invention preferably has the following arrangement: 
     Arrangement (1): 
     A plurality of heat exchanging tubes through which refrigerant flows are disposed between a pair of first and second header pipes and arranged in multiple stages to form a core section for cooling refrigerant through the heat exchanging tubes, a reservoir tank is joined to the first header pipe, and the first header pipe is communicated with the reservoir tank by a refrigerant passage. Further, the first header pipe is communicated with the reservoir tank by a connection member having the refrigerant passage, the connection member connects a portion of the first header pipe which is out of a joining portion of the header pipe where the header pipe is joined to the reservoir tank to a portion of the reservoir tank which is out of a joining portion of the reservoir tank where the reservoir tank is joined to the header pipe. 
     Arrangement (2): 
     In the arrangement (1), a separator for parting the core section into a condensing portion for condensing and liquefying a gaseous refrigerant and an overcooling portion for overcooling the liquid refrigerant thus formed by the condensing portion is provided within each of the header pipes, each the header pipe is parted, by the separator, into a first chamber communicating with the heat exchanging tubes of the condensing portion and a second chamber communicating with the heat exchanging tubes of the overcooling portion, and the connection member includes, as the refrigerant passage, a first refrigerant passage for communicatively connecting the first chamber in the first header pipe to the reservoir tank, and a second refrigerant passage for communicatively connecting the second chamber in the first header pipe to the reservoir tank. 
     Arrangement (3): 
     In the arrangement (2), the connection member includes a first connection member having the first refrigerant passage and a second connection member that has the second refrigerant passage and that is separated from the first connection member. 
     Arrangement (4): 
     In any one of the arrangements (1) to (3), an accessory connection port communicated with the refrigerant passage is provided on the connection member so that an accessory part can be attached to the accessory connection port. 
     Arrangement (5): 
     In the arrangement (4), a filter for filtering out dust contained in the refrigerant is inserted into and disposed in the refrigerant passage through the accessory connection port, and the accessory part serving also as a sealing plug of the accessory connection port is attached to the accessory connection port. 
     In the arrangement (1), the first header pipe is communicatively connected to the reservoir tank by a connection member provided with a refrigerant passage, the connection member connects a portion of the first header pipe which is out of a joining portion of the header pipe where it is joined to the reservoir tank to a portion of the reservoir tank which is out of a joining portion of the reservoir tank where it is joined to the header pipe. Accordingly, the joining portions for forming the refrigerant passage are a joining portion between the fist header pipe and the connection member and a joining portion between the reservoir tank and the connection member. Accordingly, the joining areas of the joining portions forming the refrigerant passages are smaller than that in the conventional product shown in FIG. 11 in which the refrigerant passage is formed by joining the first header pipe and the reservoir tank. Further, the length of the outer circumference of the joining portions forming the refrigerant passage is reduced. 
     When the leakage of the refrigerant from the joining portions forming the refrigerant passage occurs, the location of the leakage can be confined to either one of the joining portion between the first header pipe and the connection member and the joining portion between the reservoir tank and the connection member. 
     Accordingly, when the refrigerant leaks from the joining portions for forming the refrigerant passage, the circumferential length of the joining portion requiring its repair can be further shortened in comparison to that required in the conventional product shown in FIG.  11 . Therefore, the repairing work to hermetically seal the joining portion over its entire circumference by hard soldering or the like is easy. 
     In the arrangement (2), the refrigerant liquefied by the condensing portion of the core section flows from the first chamber of the first header pipe into the reservoir tank, through the first refrigerant passage of the connection member. The liquid refrigerant in the reservoir tank flows from the tank through the second refrigerant passage of the connection member to the second chamber of the first header pipe, and flows into the overcooling portion where the refrigerant is overcooled. Therefore, even if the core section is parted into the condensing portion and the overcooling portion, the joining portions for forming the refrigerant passages are the joining portion between the first header pipe and the connection member and the joining portion between the reservoir tank and the connection member. 
     The areas of the joining portion for forming the refrigerant passages can be reduced when comparing with the conventional product shown in FIG. 11, and the circumference length of the joining portion can be reduced. When the refrigerant leaks from the joining portion for the refrigerant passage, the leaking location can be confined to the joining portion between the first header pipe and the connection member or the joining portion of the reservoir tank and the connection member. 
     Accordingly, even if the core section is parted into the condensing portion and the overcooling portion, when the refrigerant leaks from the joining portion for the refrigerant passage, the circumferential length of the joining portion requiring its repair is shorter than that in the conventional product shown in FIG.  11 . As a result, the repairing work to hermetically seal the joining portion over its entire circumference by hard soldering or the like is easy. 
     In the arrangement (3), in the connection member, a first connection member with a first refrigerant passage is separate from a second connection member with a second refrigerant passage. A broad choice is secured in designing the layout of the first and second refrigerant passages, thereby increasing design freedom. 
     When the refrigerant leaks from the joining portions for forming both the refrigerant passages, the leaking location can be confined to the joining portion of one of the first connection member and the second connection member. Accordingly, the circumferential length of the joining portion requiring its repair is shorter than that in the arrangement (2). As a result, the repairing work to hermetically seal the joining portion over its entire circumference by hard soldering or the like is easy. 
     In the arrangement (4), an accessory connection port which communicates with the refrigerant passage and allows an accessory part to be attached thereto is provided on the connection member. Accordingly, accessory part such as a pressure switch, a pressure sensor, or a melting plug can be attached to the accessory connection port. Therefore, there is eliminated the work to set a mounting jig for the accessory part, such as a joint, in an intermediate portion of the refrigerant piping in the refrigeration cycle. This leads to reduction of the cost to construct the refrigeration cycle. 
     In the arrangement (5), a filter for filtering out dust contained in a refrigerant is inserted into and disposed in the refrigerant passage through the accessory connection port, and an accessory part serving also as a sealing plug of the accessory connection port is attached to the accessory connection port. Therefore, the sealing of the filter within the connection member and the attaching of the accessory part to the connection member can concurrently be carried out. The result is to improve the working efficiency in constructing the refrigeration cycle. 
     The present disclosure relates to the subject matter contained in Japanese patent application No. Hei. 11-88199 (filed on Mar. 30, 1999), and Japanese patent application No. 2000-49983 (filed on Feb. 25, 2000), which are expressly incorporated herein by reference in their entireties. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view showing an embodiment of the present invention. 
     FIG. 2 is an exploded, perspective view showing a portion X in FIG.  1 . 
     FIG. 3 is a fragmentary sectional view showing as connection member shown in FIG.  2 . 
     FIG. 4 is a cross sectional view taken on line Y—Y in FIG.  3 . 
     FIG. 5 is a front view showing a filter in FIG.  3 . 
     FIG. 6 is a right side view showing the filter of FIG.  5 . 
     FIG. 7 is a plan view showing the filter of FIG.  5 . 
     FIG. 8 is a perspective view showing another embodiment of the present invention. 
     FIG. 9 is a perspective view showing yet another embodiment of the present invention. 
     FIG. 10 is a perspective view showing still another embodiment of the present invention. 
     FIG. 11 is an exploded, perspective view showing a major portion of a conventional product. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     First Embodiment 
     FIG. 1 is a perspective view showing an embodiment according to the present invention, to which the arrangements (1), (2), (4) and (5) are applied. A condenser  1  is used in a refrigeration cycle of a vehicular air conditioner, and includes a pair of header pipes  2  and  3  of which the top and bottom ends are both closed. A plurality of flat, heat exchanging tubes  4  through which refrigerant flows are communicatively connected to both the header pipes  2  and  3  in a state that those heat exchanging tubes are disposed between those header pipes, while being vertically arranged in multiple stages. 
     Wavy radiation fins  5  are located between the adjacent heat exchanging tubes  4 , while being in contact with those pipes disposed one on the other. The heat exchanging tubes  4  and the radiation fins  5  form a core section  10  which cools the refrigerant flowing through the heat exchanging tubes  4  by outside air flowing through spaces among the heat exchanging tubes  4 . 
     A reservoir tank, i.e. an accumulator,  6  for reserving refrigerant liquefied by cooling is joined to the header pipe  3 , and communicates with the header pipe  3  via a connection member  40 . The connection member  40  connects a portion of the header pipe  3  which is out of a joining portion of the header pipe  3  where it is joined to the reservoir tank  6  to a portion of the reservoir tank  6  which is out of a joining portion of the reservoir tank  6  where it is joined to the header pipe  3 . 
     A separator  7  for separating the core section  10  into a condensing portion  11  and an overcooling portion  12  is disposed within each of the header pipes  2  and  3 . The condensing portion  11  liquefies, by cooling, a gaseous refrigerant into a liquid refrigerant, and the overcooling portion  12  overcools the liquid refrigerant, which liquefied by the condensing portion  11  and stored in the reservoir tank  6 . 
     The inner space of the header pipe  2  is separated into a first chamber  21  communicating with the heat exchanging tubes  4  in the condensing portion  11  and a second chamber  22  communicating with the heat exchanging tubes  4  in the overcooling portion  12 , by the separator  7  disposed within the header pipe  2 . Similarly, the inner space of the header pipe  3  is separated into a first chamber  31  communicating with the heat exchanging tubes  4  in the condensing portion  11  and a second chamber  32  communicating with the heat exchanging tubes  4  in the overcooling portion  12 , by the separator  7  disposed within the header pipe  2 . 
     An inlet portion  23  with an inlet port, which introduces a gaseous refrigerant at high temperature and high pressure that is discharged from a compressor (not shown) into the first chamber  21  of the header pipe  2 , is provided on the side surface of an upper part of the header pipe  2 . An outlet portion  24  with an outlet port, which discharges the liquid refrigerant from the second chamber  22  of the header pipe  2  into an evaporator (not shown), is provided on the side surface of a lower pat of the header pipe  2 . 
     The connection member  40  is disposed across the separator  7  on the header pipe  3 . A pressure switch  50  is attached to the top end surface of the connection member  40 . The pressure switch  50  is one of the accessory parts used in the refrigeration cycle, and it operates when a refrigerant pressure reaches a predetermined value, to generate a stop signal to stop the compressor (not shown). 
     FIG. 2 is an exploded, perspective view showing a portion X in FIG.  1 . FIG. 3 is a fragmentary sectional view showing the connection member shown in FIG.  2 . First and second pipe-like protruded portions  41  and  42  are provided on one of the side walls, arcuate in cross section, of the connection member  40 , and third and fourth protruded portions  43  and  44  are provided on another side wall thereof. 
     The first protruded portion  41  communicates with the third protruded portion  43  in the connection member  40 , and the second protruded portion  42  communicates with the fourth protruded portion  44  in the connection member  40 . A partition wall is preferably provided within the connection member  40  to separate a passage extending from the first protruded portion  41  to the third protruded portion  43  from a passage extending from the second protruded portion  42  to the fourth protruded portion  44 . 
     A first insertion hole  33  through which the first protruded portion  41  of the connection member  40  is inserted into the a first chamber  31  in the connection member  40  and a second insertion hole  34  through which the second protruded portion  42  of the connection member  40  is inserted into the second chamber  32  in the header pipe  3  are formed in the header pipe  3 . A first insertion hole  61  through which the third protruded portion  43  of the connection member  40  is inserted into the reservoir tank  6  and a second insertion hole  62  through which the fourth protruded portion  44  of the connection member  40  is inserted into the reservoir tank  6  are formed in the reservoir tank  6 . 
     The connection member  40  is joined to the header pipe  3  in a manner that the first protruded portion  41  is inserted into the first insertion hole  33 , and the second protruded portion  42  is inserted into the second insertion hole  34  of the header pipe  3 , and joined to the reservoir tank  6  in a manner that the third protruded portion  43  is inserted into the first insertion hole  61  of the reservoir tank  6 , and the fourth protruded portion  44  is inserted into the second insertion hole  62  of the reservoir tank  6 . 
     Accordingly, the connection member  40  includes refrigerant passage  45  by which the header pipe  3  communicates with the reservoir tank  6 , to thereby allow a refrigerant to flow therethrough. That is, the connection member  40  includes, as the refrigerant passage  45 , a first refrigerant passage  45   a  through which the first chamber  31  of the header pipe  3  communicates with the reservoir tank  6 , and a second refrigerant passage  45   b  through which the second chamber  32  of the header pipe  3  communicates with the reservoir tank  6 . The connection member  40  is formed with an accessory connection port  47  communicating with the first refrigerant passage  45   a , and a pressure switch  50  is removably mounted to an opening of the accessory connection port  47 . 
     FIG. 4 is a cross sectional view taken on line Y—Y in FIG.  3 . As shown in FIGS. 3 and 4, a filter  70  for filtering off dust from the refrigerant is located in the first refrigerant passage  45   a  in a state that it maybe removed therefrom through an accessory connection port  47 . The filter  70  is pushed by the pressure switch  50 , thereby being fixed in place. The pressure switch  50  serves also as a sealing plug, and sealingly places the filter  70  within the connection member  40 . 
     FIG. 5 is a front view showing the filter. FIG. 6 is a right side view showing the filter. FIG. 7 is a plan view showing the filter. As shown in FIGS. 5 through 7, the filter  70  is formed with a filter body  71  made of a mesh material, a frame  72  for holding the filter body  71 , and positioning protrusions  73  protruded from the top and bottom surfaces of the frame  72 . 
     The lower portion of the filter  70 , which is disposed in the first refrigerant passage  45   a  of the connection member  40  is semicircular in cross section and an amount of mesh material in the lower portion is larger than that in the upper portion. The filter  70  is designed to reliably filter out dust contained in the refrigerant flowing through the first refrigerant passage  45   a  of the connection member  40 . 
     The gaseous refrigerant flows from the inlet port of the inlet portion  23  into the first chamber  21  of the header pipe  2 , and passes through the condensing portion  11  of the core section  10  where the refrigerant is cooled to be liquefied. The resultant liquid refrigerant reaches the first chamber  31  of the header pipe  3 . The refrigerant which is derived from the first chamber  31  passes through the first refrigerant passage  45   a  of the connection member  40 ,and flows into the reservoir tank  6 . At this time, the dust contained in the refrigerant is completely removed by the filter  70  located in the first refrigerant passage  45   a.    
     The refrigerant having flowed into the reservoir tank  6  is separated into a gaseous refrigerant and a liquid refrigerant within the reservoir tank  6 , and temporarily stored in the tank. The liquid refrigerant in the reservoir tank  6  flows therefrom through second refrigerant passage  45   b  of the connection member  40  to the second chamber  32  in the header pipe  3 . The refrigerant output from the second chamber  32  flows through the overcooling portion  12  where the refrigerant is overcooled, and into the second chamber  22  of the header pipe  2 . The refrigerant in the second chamber  22  flows out of the header pipe  2  through the outlet port of the outlet portion  24 . 
     In the condenser  1 , the header pipe  3  and the reservoir tank  6  are continuously connected to each other by the connection member  40  having the first and refrigerant passages  45   a  and  45   b . The connection member  40  connects a portion of the header pipe  3  which is out of a joining portion of the header pipe  3  where it is joined to the reservoir tank  6  to a portion of the reservoir tank  6  which is out of a joining portion of the reservoir tank  6  where it is joined to the header pipe  3 . 
     Accordingly, joining portions for forming the first and second refrigerant passages  45   a  and  45   b  are a joining portion between the header pipe  3  and the connection member  40  and a joining portion between the reservoir tank  6  and the connection member  40 . On the other hand, in the conventional product shown in FIG. 11, the joining portion for forming the refrigerant passage D is the joining portion between the flat surface B 2  of the header pipe B and the flat surface C 2  of the reservoir tank C. 
     Accordingly, in the condenser  11 , the joining areas of the joining portions forming both the refrigerant passages  45   a  and  45   b  are smaller than that in the conventional product shown in FIG. 11, and the outer circumference of the joining portions is reduced in length. When the refrigerant leaks from the joining portions for forming the refrigerant passages  45   a  and  45   b , a leaking location can be confined to either one of the joining portion between the header pipe  3  and the connection member  40  and the joining portion between the reservoir tank  6  and the connection member  40 . 
     Accordingly, when, in the condenser  1 , the refrigerant leaks from the joining portions for forming the refrigerant passages  45   a  and  45   b , the circumferential length of the joining portion requiring its repair is shorter than that in the conventional product shown in FIG.  11 . As a result, the repairing work to hermetically seal that joining portion over its entire circumference by hard soldering or the like is easy. 
     In the condenser  1 , the accessory connection port  47  communicating with the first refrigerant passage  45   a  is provided in the connection member  40 , and the pressure switch  50  is attached to the accessory connection port  47 . Therefore, there is eliminated the work to set a mounting jig for the pressure switch  50 , such as a joint, in an intermediate portion of the refrigerant piping in the refrigeration cycle. This leads to reduction of the cost to construct the refrigeration cycle. 
     In the condenser  1 , the filter  70  for filtering out the dust contained in the refrigerant is inserted to the first refrigerant passage  45   a  of the connection member  40  through the accessory connection port  47  of the connection member  40 , and the pressure switch  50  serving also as a sealing plug for the accessory connection port  47  is attached to the accessory connection port  47 . Therefore, the sealing of the filter  70  within the connection member  40  and the attaching of the pressure switch  50  to the connection member  40  can concurrently be carried out. The result is to improve the working efficiency in constructing the refrigeration cycle. 
     The filter  70  is removably placed within the first refrigerant passage  45   a  of the connection member  40 , through the accessory connection port  47  of the connection member  40 . And the pressure switch  50  is detachably attached to the accessory connection port  47 . Therefore, the washing and the exchanging work of the filter  70  is also easy. 
     Such a condenser is known in which a cover is removably provided on the reservoir tank, and a filter is removably placed in the reservoir tank in a sealing fashion (JP-A-7-180930, FIG.  9 ). In such a conventional condenser, the filter is placed in the reservoir tank, so that the inside space and the inside volume of the reservoir tank are reduced. This fact runs counter to the tendency of size reduction of the reservoir tank. 
     In this connection, in the condenser  1 , the filter  70  is inserted into the first refrigerant passage  45   a  of the connection member  40  through the accessory connection port  47  of the connection member  40 , and the pressure switch  50  serving also as a sealing plug for the accessory connection port  47  is attached to the accessory connection port  47 . With this unique structure, there is no need of using the cover removably mounted on the reservoir tank  6  and the filter located therewithin. Accordingly, the size reduction of the reservoir tank  6  is realized. 
     Second Embodiment 
     FIG. 8 is a perspective view showing an embodiment of the invention, to which the arrangement (1) to (5) are applied. In the description of the second embodiment, like or equivalent portions are designated by like reference numerals. 
     In a condenser  100  shown in FIG. 8, the connection member  140  includes a first connection member  141  with a first refrigerant passage  45   a  and a second connection member  142  with a second refrigerant passage  45   b , which is provided separately from the first connection member  141 . The first connection member  141  is disposed in the upper portions of the header pipe  3  and the reservoir tank  6 , and the pressure switch  50  is detachably attached to the top end surface of the first connection member in which the accessory connection port  47  is formed. 
     In the condenser  100 , the first connection member  141  with the first refrigerant passage  45   a  is separate from the second connection member  142  with the second refrigerant passage  45   b . Therefore, a broad choice is secured in designing the layout of the first and second refrigerant passages  45   a  and  45   b , thereby increasing design freedom. 
     When the refrigerant leaks from the joining portions for forming the refrigerant passage  45 , a leaking location can be confined to one of the joining portions of the first connection member  141  and the second connection member  142 . The circumferential length of the joining portion requiring its repair is shorter than that in the condenser  1 . As a result, the repairing work to hermetically seal that joining portion over its entire circumference by hard soldering, for example, is easy. 
     Since the first connection member  141  is disposed in the upper portions of the header pipe  3  and the reservoir tank  6 , the attaching and detaching of the pressure switch  50  to and from the top end surface of the first connection member  141  is easy. 
     In the condenser  1 ,  100  mentioned above, the pressure switch  50  is attached to the top end surface of the connection member  40 ,  140 . In an alternative, the accessory connection port  47  of the connection member  40 ,  140  may be formed through a proper surface, other than the top end surface, of the connection member  40 ,  140 , and the pressure switch  50  maybe attached to this surface opened for the accessory connection port. 
     The condenser  1 ,  100  uses the pressure switch  50  as the accessory part used in the refrigeration cycle. However, the accessory part is not limited to the pressure switch  50 , but may be a pressure sensor for sensing a pressure of the refrigerant, a melting plug which will melt when a temperature of the refrigerant reaches a predetermined value, or the like. 
     Further, in the condenser  1 ,  100 , the connection member  40 ,  140  is provided with the accessory connection port  47  communicating with the first refrigerant passage  45   a . In an alternative, the connection member  40  ( 140 ) may be provided with the accessory connection port  47  communicating with the first refrigerant passage  45   a  and another accessory connection port communicating with the second refrigerant passage  45   b  or may be provided with only the latter in place of the accessory connection port  47 . 
     The filter  70  may be inserted into and disposed in the second refrigerant passage  45   b , through the accessory connection port communicating with the second refrigerant passage  45   b , as a matter of course. Further, the filter  70  may be removably disposed in at least one of the first and second refrigerant passages  45   a  and  45   b.    
     In a case where a desiccant, e.g., silica gel, for removing water content of the refrigerant, while being held with a mesh material having a permeability to liquid, is located in the reservoir tank  6 , there is the possibility that broken pieces of the desiccant flows, together with the refrigerant, out of the reservoir tank  6 , and the heat exchanging tubes  4  are clogged with those broken pieces. However, this problem can be solved by locating the filter  70  in the second refrigerant passage  45   b.    
     Third Embodiment 
     FIG. 9 is a perspective view showing an embodiment of the present invention, to which the arrangements (1) to (3) are applied. In the description of the third embodiment, like or equivalent portions are designated by like reference numerals. 
     In a condenser  200  shown in FIG. 9, a connection member  240  includes a first connection member  241  with a first refrigerant passage  45   a  and a second connection member  242  with a second refrigerant passage  45   b , which is separate from the first connection member  241 . Each of the first and second connection members  241  and  242  is formed as a pipe member, and the accessory connection port  47  is not provided to each of the first and second connection members  241  and  242 . 
     In the condenser  200 , the first and second connection members  241  and  242  are both formed as pipe members without the accessory connection port  47 . Therefore, both the connection members  241  and  242  are simple in structure, and hence weight of and cost to manufacture those members are reduced. 
     In the condenser  1 ,  100 ,  200 , the core section  10  is parted into the condensing portion  11  and the overcooling portion  12  by the separator  7 , and the header pipe  3  is parted into the first chamber  31  and second chamber  32  by the separator. Accordingly, the connection member  40 ,  140 ,  240  must include, as the refrigerant passage  40 , at least two passages, the first refrigerant passage  45   a  and the second refrigerant passage  45   b.    
     However, the arrangement (1) according to the present invention may be used in combination with the core section  10  that consists of only the condensing portion  11  as in a condenser  300  shown in FIG. 10, for example. Where the core section  10  consists of only the condensing portion  11 , a connection member  340  may be provided with at least one passage, as the refrigerant passage  40 , to communicatively connect the header pipe  3  with the reservoir tank  6 . In the condenser  300 , the outlet portion  24  with an outlet port through which a liquid refrigerant flows out is provided on the reservoir tank  6 , not the header pipe  2 . 
     In the condenser  1 ,  100 ,  200 , the header pipe  2 ,  3  is parted into the first chamber  21 ,  31  and the second chamber  22 ,  32  by the separator  7 . If required, as described in JP-A-9-257337, partition walls may be provided in each of the first chambers  21  and  31  of the header pipes  2  and  3  so that each of the first chambers  21  and  31  is divided into small chambers to allow the refrigerant to flow in zig-zag fashion through the condensing portion  11  (For example, the partition walls are arranged such that the refrigerant flows rightward through the heat exchanging tube  4  of the first stage, then leftward through the heat exchanging tube  4  of the second stage, then rightward through the heat exchanging tube  4  of the third stage.). Likewise, partition walls may be provided in each of the second chambers  22  and  32  of the header pipes  2  and  3  so that each of the second chambers  22  and  32  are divided into small chambers to allow the refrigerant to flow in zig-zag fashion through the overcooling portion  12 . 
     Likewise, in the condenser  300 , partitioning walls may be provided in each of the header pipes  2  and  3  so that the inside of each of the pipes  2  and  3  are divided into small chambers to allow the refrigerant to flow in a zig-zag fashion in the condensing portion  11 .