JP2017015278A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange unit excellent in workability for piping connection and also excellent in layout property.SOLUTION: In a heat exchanger 3A, quadrangle heat transfer plates 31 are laminated, and between two heat transfer plate 31 adjacent in a lamination direction, a cooling water passage and a refrigerant passage are formed. The heat transfer plates 31 arranged at ends in the lamination direction include a cooling water inflow port 34 and a cooling water outflow port 35 of the cooling water passage, and a refrigerant inflow port 36 and a refrigerant outflow port 37 of the refrigerant passage. In a heat transfer plate 31 arranged at one end in the lamination direction, the refrigerant inflow port 36 and the refrigerant outflow 37 are arranged adjacently with an interval smaller than the length of the short side of the heat transfer plate 31.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heat exchanger in which heat transfer plates are stacked.

  For example, as shown in Patent Document 1, a water-cooled condenser that is a heat exchanger has a refrigerant passage through which a refrigerant passes and a cooling water passage through which cooling water passes in the heat exchanger, and between the refrigerant and the cooling water. The refrigerant is cooled by cooling water through heat exchange.

  In such a water-cooled condenser, a large number of heat transfer plates are stacked, and a refrigerant passage and a cooling water passage are formed between adjacent heat transfer plates. The refrigerant passage and the cooling water passage are alternately formed with each heat transfer plate as a partition, and the refrigerant and the cooling water exchange heat through the heat transfer plate. A cooling water inlet, a cooling water outlet, a refrigerant inlet, and a refrigerant outlet are formed in one or both of the heat transfer plates arranged at both ends in the stacking direction.

  The cooling water inlet and the cooling water outlet may be formed on the same heat transfer plate or different heat transfer plates in order to increase the substantial length of the cooling water passage and improve heat exchange. It is formed at the corner (corner) of a rectangular diagonal line. For the same reason, the refrigerant inflow port and the refrigerant outflow port are formed at the corners of a rectangular diagonal line when they are formed on the same heat transfer plate or different heat transfer plates.

JP2013-119382A

  However, if the cooling water inlet and cooling water outlet pair, and the refrigerant inlet and refrigerant outlet pair are formed at the corners (corners) of the rectangular diagonal line, the pipe connection workability is poor and the layout is also good. bad.

  Because the cooling water passage is formed in a path that does not turn back in the heat exchanger for the purpose of suppressing flow resistance, the cooling water inlet and the cooling water outlet are usually formed on the same heat transfer plate. is there. On the other hand, the refrigerant passage is usually formed in a path that is folded back in the heat exchanger, for example, for the purpose of improving the heat exchange property of the refrigerant. Therefore, the refrigerant inlet and the refrigerant outlet are formed on different heat transfer plates. Thus, when the refrigerant inlet and the refrigerant outlet are formed on different heat transfer plates, the pipe connection workability is further deteriorated and the layout is further deteriorated.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a heat exchanger with good pipe connection workability and good layout.

  In the present invention, rectangular heat transfer plates are stacked, and a first passage through which the first fluid flows and a second passage through which the second fluid flow are formed between two adjacent heat transfer plates in the stacking direction, A first inflow port through which the first fluid flows into the first passage from the outside and a first outflow port through which the first fluid flows out from the first passage to the heat transfer plate disposed at an end in the stacking direction; One end of the stacking direction in the heat exchanger provided with a second inflow port through which the second fluid flows into the second passage from the outside and a second outflow port through which the second fluid flows out from the second passage to the outside The heat transfer plate disposed on the at least one of the first inlet, the first outlet, the second inlet, and the second outlet is connected to one side of the shorter one of the heat transfer plates. A heat exchanger characterized in that the heat exchangers are arranged close to each other at intervals smaller than the length. A.

  According to the present invention, since the inlet and the outlet are the same heat transfer plate and are arranged close to each other, the pipe connectivity to the inlet and the outlet is good, and the layout is also good.

1 is a configuration diagram of a vehicle air conditioner according to a first embodiment of the present invention. 1 is a schematic perspective view of a water-cooled capacitor according to a first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention, where (a) is a cross-sectional view of a main part of a water-cooled condenser showing the flow of cooling water, and (b) is a cross-sectional view of a main part of the water-cooled condenser showing the flow of refrigerant. It is a conceptual diagram which shows 1st Embodiment of this invention and shows the refrigerant | coolant flow of the whole water-cooled condenser. 1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a schematic sectional view of an inlet / outlet block in which a solenoid valve is in a closed position, and FIG. It is the schematic which shows 1st Embodiment of this invention and shows the refrigerant | coolant flow in an entrance / exit block. FIG. 5 is a schematic perspective view of a water-cooled capacitor, showing a second embodiment of the present invention. It is a conceptual diagram which shows 2nd Embodiment of this invention and shows the refrigerant | coolant flow of the whole water-cooled condenser. FIG. 6 is a schematic perspective view of a water-cooled capacitor according to a third embodiment of the present invention. FIG. 5 is a cross-sectional view of a main part of a water-cooled capacitor according to a third embodiment of the present invention. It is a conceptual diagram which shows 3rd Embodiment of this invention and shows the refrigerant | coolant flow of a water-cooled condenser. FIG. 6 is a schematic perspective view of a water-cooled capacitor according to a fourth embodiment of the present invention. FIG. 10 is a schematic perspective view of a water-cooled capacitor according to a fifth embodiment of the present invention. FIG. 10 is a schematic perspective view of a heat transfer plate according to a fifth embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 to 6 show a first embodiment of the present invention. As shown in FIG. 1, the vehicle air conditioner includes a heat pump refrigeration cycle 1, a hot water cycle 10, and a control unit (not shown) that controls them.

  The refrigeration cycle 1 bypasses a compressor 2 that compresses refrigerant, a water-cooled condenser 3A that is a heat exchanger that exchanges heat between the refrigerant compressed by the compressor 2 and hot water, and a refrigerant passage 5a of the water-cooled condenser 3A. The first bypass passage 4a that opens, the first on-off valve 5a that opens and closes the first bypass passage 4a, the first orifice 6a that decompresses the refrigerant heat-exchanged by the water-cooled condenser 3A, and the refrigerant heat-exchanged by the water-cooled condenser 3A Alternatively, the outdoor heat exchanger 7 that exchanges heat between the refrigerant bypassed by the water-cooled condenser 3A and the outside air, the second orifice 6b that depressurizes the refrigerant that has exited the outdoor heat exchanger 7, and the second orifice 6b An indoor heat exchanger 8 that exchanges heat between the (expanded) refrigerant and the air supplied to the room, a second bypass passage 4b that bypasses the indoor heat exchanger 8, and a second bypass passage 4 And it includes a second on-off valve 5b for opening and closing, has a function of separating such gas-liquid refrigerant, and an accumulator 9 which sends only a gas refrigerant to the compressor 2.

  The hot water cycle 10 includes a water pump 11 that circulates hot water, a water-cooled condenser 3A through which the hot water circulated by the water pump 11 passes, and the hot water that passes through the refrigerant is heated by the refrigerant. And a heater core 12 that heats the air by exchanging heat with the air supplied to the air.

  The indoor heat exchanger 8 and the heater core 12 are disposed in the air passage 30 of the air conditioning unit, and the downstream side of the air conditioning unit 12 is connected to an outlet (not shown) of the vehicle compartment by a duct (not shown). .

  In the refrigeration cycle 1, during cooling, the first on-off valve 5a is in the open position and the second on-off valve 5b is in the closed position. The outdoor heat exchanger 7 functions as a condenser (condenser), the indoor heat exchanger 8 functions as an evaporator (evaporator), and cool air is led into the vehicle interior.

  In the refrigeration cycle 1, during heating, the first on-off valve 5a is in the closed position and the second on-off valve 5b is in the open position. The water-cooled condenser 3A and the outdoor heat exchanger 7 function as a condenser (condenser), and the indoor heat exchanger 8 functions as an evaporator (evaporator). Then, the hot water of the hot water cycle 10 is circulated, and the water-cooled condenser 3A of the refrigeration cycle 1 heats the hot water of the hot water cycle 10 to heat the heater core 12, and the warm air is introduced into the vehicle interior.

  The inlet / outlet passage 21 connected to the refrigerant inlet 36 of the water-cooled condenser 3A, the outlet passage 22 connected to the refrigerant outlet 37, the first bypass passage 4a and the first orifice 6a are formed in the inlet / outlet block 20. . The entrance / exit block 20 will be described in detail below.

  A partial passage 26 that connects the outdoor heat exchanger 7 and the indoor heat exchanger 8, a partial passage 27 that connects the indoor heat exchanger 8 and the accumulator 9, the second bypass passage 4b, and the second on-off valve 5b include a passage block. 25.

  As shown in FIGS. 2 to 4, the water-cooled condenser 3 </ b> A has a large number of heat transfer plates 31, and a large number of heat transfer plates 31 are laminated. The heat transfer plate 31 has a quadrangular shape. In the laminated body of the heat transfer plates 31, a cooling water passage 32 that is a first passage through which cooling water that is the first fluid flows between two adjacent heat transfer plates 31 in the stacking direction, and a refrigerant that is the second fluid. Refrigerant passages 33 are formed as second passages through which the refrigerant flows.

  The cooling water passages 32 and the refrigerant passages 33 are alternately arranged in the stacking direction. The cooling water passage 32 is branched into a plurality of rows in the laminated body, and each row is formed in the same flow direction. That is, the cooling water flow is a so-called one pass.

  The refrigerant passage 33 is also branched into a plurality of rows in the laminated body. The row group of the branched refrigerant passages 33 is divided into three, and is formed in a path that turns the flow direction twice. That is, the refrigerant flow is a so-called three-pass as shown in FIG.

  A cooling water inlet 34, which is a first inlet for flowing cooling water into the cooling water passage 32 from the outside, into the heat transfer plate 31 disposed at one end (upper end in the drawing) in the stacking direction, and the cooling water passage 32 from the outside A coolant outlet 35 serving as a first outlet through which the coolant flows out, a coolant inlet 36 serving as a second inlet into which the refrigerant flows into the refrigerant passage 33, and a refrigerant outflowing from the refrigerant passage 33 to the outside. A refrigerant outlet 37 which is a second outlet is provided.

  The cooling water inlet 34 and the cooling water outlet 35 are respectively arranged at different corners (corners) on the diagonal line of the heat transfer plate 31. The refrigerant inlet 36 and the refrigerant outlet 37 are different corners (corners) of the heat transfer plate 31 from the positions where the cooling water inlet 34 and the cooling water outlet 35 are arranged, and the shorter one of the heat transfer plate 31. They are arranged close to each other at intervals smaller than the length of one side.

  The outlet 38 of the refrigerant that has flowed through the laminated body of the heat transfer plate 31 is formed in the heat transfer plate 31 disposed at the other end (the lower end in the drawing) in the stacking direction. The outlets 37 are connected by a pipe 40 that passes outside the laminated body of the heat transfer plates 31.

  As shown in FIGS. 5 and 6, the inlet / outlet block 20 includes an inlet-side communication path 21 connected to the refrigerant inlet 36, an outlet-side communication path 22 connected to the refrigerant outlet 37, the inlet-side communication path 21, and the outlet. A passage group including a bypass passage 4 a connecting the side communication passages 22 is provided. The entrance / exit block 20 includes a first on-off valve 5 a that opens and closes the bypass passage 4 a and an orifice 6 a provided in the outlet-side passage 22 as passage adjusting means.

  The first on-off valve is of an electromagnetic type, and when deenergized as shown in FIG. 5A, the first bypass passage 4a is located in the closed position, the refrigerant flows into the water-cooled condenser 3A, and FIG. During the energization shown, the first bypass passage 4a is located at the open position, and the refrigerant bypasses the water-cooled condenser 3A (see FIG. 6).

  As described above, in the first embodiment, since the refrigerant inlet 36 and the refrigerant outlet 37 are the same heat transfer plate 31 and are disposed close to each other, the pipe connectivity to the refrigerant inlet 36 and the refrigerant outlet 37 is improved. Good layout.

  A set of a cooling water inlet (cooling water inlet 34) entering the laminated body of the heat transfer plates 31 and a cooling water outlet (cooling water outlet 35) exiting from the laminated bodies of the heat transfer plates 31, and a lamination of the heat transfer plates 31. The refrigerant inlet (refrigerant inlet 36) that enters the body and the refrigerant outlet 38 that exits the laminated body of the heat transfer plates 31 are formed at different corners (corners) on the diagonal line of the heat transfer plate 31, respectively. ing. Accordingly, the cooling water flows through the one-pass cooling water passage 32 with as short a cut as possible, and the refrigerant flows through the three-pass refrigerant passage 32 with as little sheet cut as possible, so that heat is transferred through the refrigerant inlet 36 and the refrigerant outlet 37. Even if it is arranged close to the plate 31, the heat exchange performance is not lowered.

  The heat transfer plate 31 disposed at one end in the stacking direction is provided with both sets of the cooling water inlet 34 and the cooling water outlet 35, the refrigerant inlet 36 and the refrigerant outlet 37. Accordingly, since the inlets 34 and 36 and the outlets 35 and 37 of both the cooling water passage 32 and the refrigerant passage 33 are disposed on the same heat transfer plate 31, both the cooling water passage 32 side and the refrigerant passage 33 side flow. The piping connectivity to the inlets 34 and 36 and the outlets 35 and 37 is good, and the layout is also good.

  A set of the refrigerant inlet 36 and the refrigerant outlet 37 arranged close to the heat transfer plate 31 arranged at one end in the stacking direction is connected to the refrigerant outlet 37 by a pipe 40 passing outside the stacked heat transfer plates 31. Is led to a position close to the refrigerant inlet 36. Therefore, the refrigerant inlet 36 and the refrigerant outlet 37 can be disposed close to the same heat transfer plate 31 side without changing the structure of the existing heat transfer plate 31.

  The refrigerant passage 33 is a path that folds back the laminated body of the heat transfer plates 31, and the heat transfer plate in which the refrigerant inlet 36 and the refrigerant outlet 37 of the refrigerant path 33 that is the fold path are arranged at one end in the stacking direction. 31. Therefore, the heat exchange performance is improved by using the folded path, and the pipe connection to the refrigerant inlet 36 and the refrigerant outlet 37 is good in the water-cooled condenser 3A with good heat exchange, and the layout is also good.

  The heat transfer plate 31 arranged at one end in the stacking direction is provided with a group of passages connected to the refrigerant inlet 36 and the refrigerant outlet 37 arranged in proximity and the passage adjusting means (passage switching means, passage resistance means). The entrance / exit block 20 is fixed. Therefore, by attaching the inlet / outlet block 20 to the heat transfer plate 31, it is possible to attach components connected to the refrigerant inlet 36 and the refrigerant outlet 37 of the water-cooled condenser 3 </ b> A and components arranged in the vicinity thereof. Good layout and layout.

  The heat exchanger is a water-cooled condenser 3A, and the passage group of the inlet / outlet block 20 includes an inlet side communication path 21 connected to the refrigerant inlet 36, an outlet side communication path 22 connected to the refrigerant outlet 37, and an inlet side communication path. 21 is a bypass passage 4 a that connects between the outlet side communication passage 22 and the passage adjusting means is a first on-off valve 5 a that opens and closes the bypass passage 4 a and an orifice 6 a provided in the outlet side passage 22. Therefore, the refrigeration cycle 1 that can be selectively used at the time of heating using the water-cooled condenser 3A and at the time of cooling not using the water-cooled condenser 3A can be configured with a small number of parts and good layout.

(Second Embodiment)
The second embodiment is different from the first embodiment only in the configuration of a water-cooled condenser 3B that is a heat exchanger.

  As shown in FIGS. 7 and 8, the water-cooled condenser 3 </ b> B of the second embodiment has a stacked body of a large number of heat transfer plates 31 and 31 </ b> A. Each of the heat transfer plates 31 and 31A has a substantially square shape. Each of the heat transfer plates 31 and 31A is integrally provided with an auxiliary plate portion 31a. The auxiliary plate portion 31a is formed with an opening (not shown) communicating with adjacent ones. And the vertical channel | path 42a is formed in the lamination | stacking location of the auxiliary | assistant plate part 31a by the continuous opening. Unlike the other heat transfer plates 31, the heat transfer plate 31 </ b> A located at the lowest end is formed with a concave lateral passage 42 b. The auxiliary passage 42 is constituted by the vertical passage 42a and the horizontal passage 42b.

  The outlet 38 of the refrigerant that has flowed through the laminated body is formed in the heat transfer plate 31 disposed at the other end in the stacking direction (the lower end in the drawing), but between the outlet 38 of the heat transfer plate 31 and the refrigerant outlet 37. Are connected by an auxiliary passage 42 in the heat transfer plates 31 and 31A.

  Since other configurations are the same as those of the first embodiment, description thereof is omitted. In addition, the flow of the refrigerant is three passes as in the first embodiment (see FIG. 8).

  In the set of the refrigerant inlet 36 and the refrigerant outlet 37 disposed close to the heat transfer plate 31 arranged at one end in the stacking direction, the refrigerant outlet 37 is connected to the refrigerant inlet 37 by the auxiliary passage 42 of the heat transfer plates 31 and 31A. It is led to 36 close positions. Therefore, the refrigerant inlet 36 and the refrigerant outlet 37 can be disposed close to the same heat transfer plate 31 without adding any additional components in addition to the heat transfer plates 31 and 31A.

(Third embodiment)
The third embodiment is different from the first embodiment only in the configuration of a water-cooled condenser 3C that is a heat exchanger.

  As shown in FIGS. 9 to 11, the water-cooled condenser 3 </ b> C of the third embodiment has a laminated body of a large number of rectangular heat transfer plates 31 and 31 </ b> B. Unlike the other heat transfer plates 31, the heat transfer plate 31 </ b> B located at the uppermost end has a concave auxiliary passage 43.

  The flow of the refrigerant is one pass, and the outlet 38 of the refrigerant that has flowed through the laminated body of the heat transfer plates 31 and 31B is formed in the heat transfer plate 31C disposed at one end (upper end in the drawing) in the stacking direction. . The outlet 38 of the heat transfer plate 31C and the refrigerant outlet 37 are connected by an auxiliary passage 43 in the heat transfer plate 31C.

  In the third embodiment, the set of the cooling water inlet (cooling water inlet 34) entering the laminated body of the heat transfer plates 31 and the cooling water outlet (cooling water outlet 35) exiting from the laminated bodies of the heat transfer plates 31 includes Although formed at different corners (corners) on the diagonal line of the heat plate 31, a refrigerant inlet (refrigerant inlet 36) entering the laminate of the heat transfer plates 31 and a refrigerant exiting from the laminate of the heat transfer plates 31. The pair of outlets (refrigerant outlet 37) are not formed at different corners (corners) on the diagonal line of the heat transfer plate 31, but are formed at close positions.

(Fourth embodiment)
The fourth embodiment is different from the first embodiment only in the configuration of a water-cooled condenser 3D that is a heat exchanger.

  As shown in FIG. 12, the water-cooled condenser 3 </ b> D of the fourth embodiment has a laminate of a large number of rectangular heat transfer plates 31.

  The flow of the refrigerant is two passes, and the outlet 38 of the refrigerant that has flowed through the laminated body of the heat transfer plates 31 is formed in the heat transfer plate 31 arranged at an intermediate position (pass partition position) in the lamination direction. . The outlet 38 of the heat transfer plate 31 and the refrigerant outlet 37 are connected by auxiliary passages 44 in a large number of heat transfer plates 31.

(Fifth embodiment)
The fifth embodiment is different from the first embodiment only in the configuration of a water-cooled condenser 3E that is a heat exchanger.

  As shown in FIGS. 13 and 14, the water-cooled condenser 3 </ b> E of the fifth embodiment has a laminated body of a large number of rectangular heat transfer plates 31.

  The flow of the refrigerant is two passes, but unlike the fourth embodiment, the path is folded in a direction orthogonal to the stacking direction. Of the heat transfer plate 31, a partition wall 31b is provided on the plate 31 forming the refrigerant passage.

  A refrigerant outlet 37 is provided in the heat transfer plate 31 disposed at one end (upper end in the drawing) in the stacking direction.

  In the fifth embodiment, a set of a cooling water inlet (cooling water inlet 34) entering the laminated body of the heat transfer plates 31 and a cooling water outlet (cooling water outlet 35) exiting from the laminated bodies of the heat transfer plates 31 is a transfer of heat. Although formed at different corners (corners) on the diagonal line of the heat plate 31, a refrigerant inlet (refrigerant inlet 36) entering the laminate of the heat transfer plates 31 and a refrigerant exiting from the laminate of the heat transfer plates 31. The pair of outlets (refrigerant outlet 37) are not formed at different corners (corners) on the diagonal line of the heat transfer plate 31, but are formed at close positions.

(Modification)
In the first to fifth embodiments, the refrigerant inlet 36 and the refrigerant outlet 37 are arranged close to each other. However, even if the cooling water inlet 34 and the cooling water outlet 35 are arranged close to each other, the refrigerant inlet 36 and the refrigerant flow are also arranged. The cooling water inlet 34 and the cooling water outlet 35 may be disposed close to the outlet 37.

  In the first to fifth embodiments, the flow of the cooling water is one pass, but may be a plurality of passes.

3A-3E Water-cooled condenser (heat exchanger)
4a First bypass (bypass)
5a First open / close valve (open / close valve)
6a Orifice 20 Entrance / exit block 21 Inlet side communication path 22 Outlet side communication path 31, 31A, 31B Heat transfer plate 32 Cooling water path (first path)
33 Refrigerant passage (second passage))
34 Cooling water inlet (first fluid inlet)
35 Cooling water outlet (first fluid outlet)
36 Refrigerant inlet (second fluid inlet)
35 Refrigerant outlet (second fluid outlet)
40 Piping 42, 43, 44 Auxiliary passage

Claims (8)

A rectangular heat transfer plate (31) is stacked, and a first passage (32) through which the first fluid flows between two adjacent heat transfer plates (31) in the stacking direction and a second passage through which the second fluid flows. (33) are respectively formed, and the first inflow port (34) for flowing the first fluid from the outside into the first passage (32) and the heat transfer plate (31) disposed at the end in the stacking direction, and the A first outlet (35) that flows out the first fluid from the first passage (32) to the outside, a second inlet (36) that flows in the second fluid from the outside to the second passage (33), and the first In the heat exchanger (3A-) provided with the second outlet (37) for flowing out the second fluid to the outside from the two passages (33),
In the heat transfer plate (31) disposed at one end in the stacking direction, the first inlet (34), the first outlet (35), the second inlet (36), and the second flow are provided. The heat exchangers (3A to 3E), wherein at least one pair with the outlet (37) is disposed close to each other at a distance smaller than the shorter one side length of the heat transfer plate (31). The heat exchanger (3A-3E) according to claim 1,
A set of an inlet of a first fluid entering the stack of heat transfer plates (31), an outlet of a first fluid exiting from the stack of heat transfer plates (31), and a stack of the heat transfer plates (31). At least one of the second fluid inlet and the second fluid outlet exiting from the stack of the heat transfer plates (31) is at different corners on the diagonal of the heat transfer plate (31). Heat exchangers (3A to 3E) characterized by being formed respectively. It is a heat exchanger (3A, 3C-3E) of Claim 1 or Claim 2, Comprising:
The heat transfer plate (31) disposed at one end in the stacking direction includes a set of the first inlet (34) and the first outlet (35), the second inlet (36), and the A heat exchanger (3A to 3E) characterized in that both sets of second outlets (37) are arranged together. It is a heat exchanger (3A, 3C-3E) in any one of Claims 1-3, Comprising:
A set of the first inlet (34) and the first outlet (35) and / or the second inlet (36) arranged close to the heat transfer plate (31) arranged at one end in the stacking direction. ) And the second outlet (37) are connected to the adjacent position on the other side by the auxiliary passages (42), (43), (44) of the heat transfer plates (31), (31A), (31C). A heat exchanger (3A, 3C-3E) characterized by guiding. It is a heat exchanger (3B) in any one of Claims 1-3, Comprising:
A set of the first inlet (34) and the first outlet (35) and / or the second inlet (36) arranged close to the heat transfer plate (31) arranged at one end in the stacking direction. ) And the second outlet (37) are led to the adjacent position on the other side by a pipe (40) passing outside the laminated body of the heat transfer plates (31). ). A heat exchanger (3A, 3B, 3D, 3E) according to any one of claims 1 to 5,
At least one of the first passage (32) and the second passage (33) is a path that folds back the stacked body formed by the plurality of heat transfer plates (31), and the inlet of the path that is the fold-back path The heat exchanger (3A, 3B, 3D, 3E) is characterized in that (36) and the outlet (37) are arranged close to the heat transfer plate (31) arranged at one end in the stacking direction. . It is a heat exchanger (3A-3E) in any one of Claims 1-6, Comprising:
The heat transfer plate (31) disposed at one end in the stacking direction includes a passage group connected to at least the inflow port (36) and the outflow port (37) disposed in proximity to each other and a passage adjusting means (passage switching means). The heat exchanger (3A to 3E) characterized by fixing the entrance / exit block (20) having a passage resistance means). The heat exchangers (3A to 3E) according to claim 7 are water-cooled condensers (3A to 3E) in which the first fluid is cooling water and the second fluid is a refrigerant.
The passage group of the inlet / outlet block (20) includes an inlet side communication path (21) connected to the inlet (36), an outlet side communication path (22) connected to the outlet (37), and an inlet side. A bypass passage (4a) connecting between the communication passage (21) and the outlet-side communication passage (22), wherein the passage adjusting means includes an on-off valve (5a) for opening and closing the bypass passage (4a), and the outlet A heat exchanger (3A to 3E) characterized by being an orifice (6a) provided in the side passage (22).

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