WO2017138145A1

WO2017138145A1 - Plate-type heat exchanger and refrigeration cycle device

Info

Publication number: WO2017138145A1
Application number: PCT/JP2016/054134
Authority: WO
Inventors: 宏亮浅沼; 悟梁池; 加藤　央平; 美藤　尚文; 博和南迫; 進一内野; 正純知崎; 浩平葛西
Original assignee: 三菱電機株式会社
Priority date: 2016-02-12
Filing date: 2016-02-12
Publication date: 2017-08-17
Also published as: JP6177459B1; JPWO2017138145A1

Abstract

The present invention is provided with: a first heat exchanging unit (10), which has a first surface and a second surface facing the first surface, and in which heat is exchanged between a first fluid and a second fluid; and a second heat exchanging unit (20), which has a third surface and a fourth surface facing the third surface, and which is disposed such that the second surface of the first heat exchanging unit (10) and the third surface are connected to each other, said second heat exchanging unit exchanging heat between a third fluid and the first fluid having been subjected to the heat exchange in the first heat exchanging unit (10). A first inflow port (61) and a first outflow port (62) of the first fluid are provided in the fourth surface of the second heat exchanging unit (20). A second inflow port (51) and a second outflow port (52) of the second fluid are provided in the first surface of the first heat exchanging unit (10). A third inflow port (63) and a third outflow port (64) of the third fluid are provided in the fourth surface of the second heat exchanging unit (20).

Description

Plate heat exchanger and refrigeration cycle equipment

The present invention relates to a plate heat exchanger and a refrigeration cycle apparatus including the plate heat exchanger.

プレート Plate-type heat exchangers that exchange heat between three fluids are known. Such a plate heat exchanger is described in, for example, Japanese Patent Application Laid-Open No. 11-94487 (Patent Document 1). In the plate heat exchanger described in this publication, the first fluid of the three fluids is distributed inside the plate, heat is exchanged between a part of the first fluid and the second fluid, Heat exchange is performed between the remaining portion of the first fluid and the third fluid. In the plate heat exchanger described in the above publication, since the inlet and outlet of each fluid are formed on the same plane, the inlet and outlet of the plate heat exchanger and external piping (hereinafter, A pipe provided outside the plate heat exchanger is referred to as an external pipe, and the external pipe can also be connected continuously for each fluid.

Japanese Patent Laid-Open No. 11-94487

However, the plate heat exchanger described in the above publication is provided with a flow path for distributing a part of the first fluid and the remaining part and then joining them. Therefore, there exists a problem that the structure of the flow path in a plate type heat exchanger becomes complicated.

The present invention has been made to solve the above-described problems. The main object of the present invention is to provide a plate-type heat exchanger that can continuously connect the inlet and outlet of the plate-type heat exchanger and the external piping for each fluid and has a simple structure. There is.

The plate type heat exchanger according to the present invention has a first surface and a second surface opposite to the first surface, and a first heat exchange unit for exchanging heat between the first fluid and the second fluid. And a fourth surface opposite to the third surface and the third surface, the second surface and the third surface of the first heat exchange unit are arranged to be connected, and the first surface A first fluid exchanged in the heat exchange unit and a second heat exchange unit for exchanging heat with the third fluid are provided. The first heat exchange unit includes a second inlet and a second outlet for entering and leaving the second fluid. The second heat exchange unit includes a first inlet and a first outlet for entering and exiting the first fluid, and a third inlet and a third outlet for entering and exiting the third fluid. The first inlet and the first outlet are provided on the fourth surface of the second heat exchange unit. The second inlet and the second outlet are provided on the first surface of the first heat exchange unit. The third inlet and the third outlet are provided on the fourth surface of the second heat exchange unit.

According to the present invention, it is possible to provide a plate-type heat exchanger that can continuously connect the inlet and outlet of a plate heat exchanger and external piping for each fluid and has a simple structure. Can do.

It is a perspective view which shows the plate type heat exchanger which concerns on Embodiment 1 from the one entrance / exit plate side. It is a perspective view which shows the plate-type heat exchanger which concerns on Embodiment 1 from the other entrance / exit plate side. 3 is a diagram illustrating an example of a flow path of each fluid in the plate heat exchanger according to Embodiment 1. FIG. 2 is an exploded view showing an example of the configuration of a plate heat exchanger according to Embodiment 1. FIG. 4 is a plan view showing an example of a first heat transfer plate of the plate heat exchanger according to Embodiment 1. FIG. FIG. 6 is a side view of the first heat transfer plate shown in FIG. 5. 4 is a plan view showing an example of a partition plate of the plate heat exchanger according to Embodiment 1. FIG. It is a side view of the partition plate shown in FIG. 4 is a plan view showing an example of a second heat transfer plate of the plate heat exchanger according to Embodiment 1. FIG. FIG. 10 is a side view of the second heat transfer plate shown in FIG. 9. 6 is a plan view showing an example of another second heat transfer plate of the plate heat exchanger according to Embodiment 1. FIG. It is a side view of the 2nd heat exchanger plate shown in FIG. 6 is a diagram illustrating an example of a flow path of each fluid in a plate heat exchanger according to Embodiment 2. FIG. It is the schematic which shows an example of the refrigerating-cycle apparatus provided with the plate type heat exchanger which concerns on Embodiment 2. FIG. It is a perspective view which shows an example of the housing | casing and connection piping of the refrigeration cycle apparatus which concern on Embodiment 2. FIG. It is a perspective view which shows the modification of the plate type heat exchanger which concerns on Embodiment 1 and Embodiment 2. FIG. It is a top view which shows the modification of the 2nd heat exchanger plate of the plate type heat exchanger which concerns on Embodiment 1 and Embodiment 2. FIG. It is a top view which shows the modification of the 1st heat exchanger plate of the plate type heat exchanger which concerns on Embodiment 1 and Embodiment 2. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
<Plate type heat exchanger>
A plate heat exchanger 100 according to Embodiment 1 will be described with reference to FIGS. The plate heat exchanger 100 includes a first heat exchange unit 10 that exchanges heat between the first fluid and the second fluid, and a heat exchange between the first fluid and the third fluid that exchanges heat in the first heat exchange unit 10. The second heat exchange unit 20 is provided. The first heat exchange unit 10 has a first surface and a second surface that faces the first surface. The second heat exchange unit 20 has a third surface and a fourth surface opposite to the third surface. The second surface of the first heat exchange unit 10 is connected to the third surface of the second heat exchange unit 20 via a partition plate 4 described later. In the plate heat exchanger 100, the first surface of the first heat exchange unit 10 faces the fourth surface of the second heat exchange unit 20 with the second surface and the third surface interposed therebetween. . The first surface, the second surface, the third surface, and the fourth surface may be curved surfaces or flat surfaces.

As shown in FIG. 1, the first heat exchange unit 10 includes a plurality of first heat transfer plates 1 and first inlet / outlet plates 5. The plurality of first heat transfer plates 1 are stacked on each other. The first entrance / exit plate 5 is disposed on the opposite side of the second heat exchange unit 20 with respect to the plurality of stacked first heat transfer plates 1 in the stacking direction of the first heat transfer plates 1. The first entrance / exit plate 5 has the first surface of the first heat exchange unit 10. The first heat transfer plate 1 disposed at the position farthest from the first entrance / exit plate 5 in the plurality of first heat transfer plates 1 (arranged adjacent to the partition plate 4 described later) is a first heat exchange unit. It has ten second surfaces. On the first surface of the first inlet / outlet plate 5, a second inlet 51 and a second outlet 52 for flowing the second fluid into and out of the plate heat exchanger 100 are formed.

As shown in FIGS. 1 and 2, the second heat exchange unit 20 includes a plurality of second

heat transfer plates

2, 3 and a second inlet / outlet plate 6. The plurality of second

heat transfer plates

2 and 3 include at least two types of second heat transfer plates 2 and second heat transfer plates 3 having different structures (details will be described later). The second heat exchange unit 20 only needs to include at least one or more of each of the second heat transfer plate 2 and the second heat transfer plate 3, but preferably includes a plurality of each. The plurality of second

heat transfer plates

2 and 3 are alternately stacked. The stacking direction of the second

heat transfer plates

2 and 3 is the same as the stacking direction of the first heat transfer plate 1 (hereinafter simply referred to as the stacking direction). The second entrance / exit plate 6 is arranged on the opposite side of the first heat exchange unit 10 with respect to the plurality of stacked second

heat transfer plates

2 and 3 in the stacking direction of the second

heat transfer plates

2 and 3. The second entrance / exit plate 6 has a fourth surface of the second heat exchange unit 20. The second heat transfer plate 2 disposed at a position farthest from the second entrance / exit plate 6 in the plurality of second heat transfer plates 2 and 3 (arranged adjacent to the partition plate 4 described later) A third surface of the exchange unit 20 is provided. On the fourth surface of the second inlet / outlet plate 6, a first inlet 61 and a first outlet 62 for flowing the first fluid into and out of the plate heat exchanger 100, and a third fluid as the plate type A third inflow port 63 and a third outflow port 64 for flowing into and out of the heat exchanger 100 are formed.

The first heat exchange unit 10 and the second heat exchange unit 20 are partitioned by the partition plate 4. The first entrance / exit plate 5 and the second entrance / exit plate 6 constitute one end and the other end in the laminating direction in the plate heat exchanger 100 (the first heat exchange unit 10 and the second heat exchange unit 20), respectively. ing. In the following, the first entrance / exit plate 5 side in the stacking direction is referred to as a front side, and the second entrance / exit plate 6 side is referred to as a rear side.

As shown in FIG. 3, the second fluid that has flowed into the first heat exchange unit 10 from the second inlet 51 passes through the flow path 8 formed in the first heat exchange unit 10, and then reaches the second outlet 52. Out to the outside. The third fluid that has flowed into the second heat exchange unit 20 from the third inlet 63 flows out from the third outlet 64 through the flow path 9 formed in the second heat exchange unit 20. The first fluid that has flowed into the second heat exchange unit 20 from the first inlet 61 flows into the first heat exchange unit 10 through the flow path 7a formed in the second heat exchange unit 20, and the first heat. It flows into the second heat exchange unit 20 through the

flow paths

7b and 7c formed in the exchange unit 10, and passes through the flow path 7d formed in the second heat exchange unit 20 from the first outlet 62. Spill to

As shown in FIG. 3 and FIG. 4, a plurality of first fluid flow paths 7 b and second fluid flow paths 8 are respectively formed between adjacent first heat transfer plates 1 in the first heat exchange unit 10. ing. The flow path 7b of the first fluid and the flow path 8 of the second fluid intersect the surface of the first heat transfer plate 1 (heat transfer surface 17 shown in FIG. 5) (crossing the stacking direction). In the direction). The first fluid channel 7 b and the second fluid channel 8 are provided adjacent to each other via the first heat transfer plate 1. Between the first heat transfer plates 1 adjacent to each other in the first heat exchange unit 10, the first fluid flow paths 7 b and the second fluid flow paths 8 are alternately formed.

As shown in FIGS. 3 and 4, the first fluid flow path 7 d and the third fluid flow path 9 are adjacent to each other in the second heat exchange unit 20, the second heat transfer plate 2 and the second heat transfer plate. 3 are formed between each of them. The flow path 7d of the first fluid and the flow path 9 of the third fluid are along the surfaces of the second heat transfer plate 2 and the second heat transfer plate 3 (heat transfer surfaces 29 and 39 shown in FIGS. 9 and 11). The second heat transfer plate 2 or the second heat transfer plate 3 is provided adjacent to each other. Between the second heat transfer plate 2 and the second heat transfer plate 3 adjacent to each other in the second heat exchange unit 20, the first fluid flow path 7 d and the second fluid flow path 9 are alternately formed. Yes.

As shown in FIGS. 3 and 4, the flow path 7 a of the first fluid is a direction perpendicular to the surfaces of the plurality of second

heat transfer plates

2, 3 from the first inlet 61 to the first heat exchange unit 10. It is provided along (the above-mentioned lamination direction). The first fluid flow path 7 a passes through all of the plurality of second

heat transfer plates

2 and 3 and the partition plate 4 included in the second heat exchange unit 20.

<Specific configuration of each plate>
As shown in FIGS. 4 to 12, the planar shape of the first heat transfer plate 1, the second

heat transfer plate

2, 3, the partition plate 4, the first and second inlet /

outlet plates

5, 6 is, for example, a substantially rectangular shape. It is. The first heat transfer plate 1, the second

heat transfer plate

2, 3, the partition plate 4, the first and second inlet /

outlet plates

5, 6 are connected to each other in the passage holes overlapping in the stacking direction. The plates are connected by, for example, brazing.

As shown in FIGS. 4 and 5, four passage holes 11, 12, 13, 15 for allowing the first fluid or the second fluid to flow through the outer peripheral portion (four corners) of the first heat transfer plate 1. Is provided. Specifically, the passage hole 11 and the passage hole 12, and the passage hole 13 and the passage hole 15 are provided so as to face each other with an interval in the longitudinal direction of the second heat transfer plate 2. Further, the passage hole 11 and the passage hole 15, and the passage hole 12 and the passage hole 13 are provided so as to face each other with an interval in the short direction of the second heat transfer plate 2. The passage holes 11, 12, 13, and 15 penetrate the first heat transfer plate 1 in the thickness direction (the laminating direction).

In the central portion of the first heat transfer plate 1, for example, a heat transfer surface 17 on which a herringbone-like corrugated pattern (not shown) is formed is provided. As shown in FIGS. 4 to 6, the first heat transfer plate 1 is provided with

convex portions

14 and 16 that protrude to the front side in the stacking direction with respect to the heat transfer surface 17. The passage holes 13 and 15 are provided on the top surfaces of the

convex portions

14 and 16. The top surfaces of the

protrusions

14 and 16 are in contact with the back surfaces of the other first heat transfer plates 1 or the first entrance / exit plates 5 adjacent on the front side in the stacking direction.

As shown in FIGS. 4 and 7, two passage holes 41 and 43 for allowing the first fluid to flow are provided in the outer peripheral portion of the partition plate 4. The passage holes 41 and 43 are provided at intervals in the longitudinal direction of the partition plate 4. The passage holes 41 and 43 penetrate the partition plate 4 in the thickness direction (the stacking direction). The partition plate 4 is provided with

convex portions

42 and 44 that protrude to the front side in the stacking direction with respect to the surface 45 of the center portion. The passage holes 41 and 43 are provided on the top surfaces of the

convex portions

42 and 44. The top surfaces of the

convex portions

42 and 44 are in contact with the back surface of the first heat transfer plate 1 adjacent in the stacking direction (the surface located on the opposite side of the heat transfer surface 17).

As shown in FIGS. 4, 9, and 10, two passage holes 21 and 22 for allowing the third fluid to flow and the first fluid to flow through the outer peripheral portion of the second heat transfer plate 2. These three passage holes 23, 25 and 27 are provided. The passage holes 21, 22, 25, 27 are provided at the four corners of the second heat transfer plate 2. Specifically, the passage hole 21 and the passage hole 22, and the passage hole 25 and the passage hole 27 are provided so as to face each other with an interval in the longitudinal direction of the second heat transfer plate 2. Further, the passage hole 21 and the passage hole 27, and the passage hole 22 and the passage hole 25 are provided so as to face each other with an interval in the short direction of the second heat transfer plate 2. The passage hole 23 is provided between the passage hole 22 and the passage hole 25 in the short direction. The passage holes 21, 22, 23, 25, and 27 penetrate the second heat transfer plate 2 in the thickness direction (the stacking direction).

At the center of the second heat transfer plate 2, for example, a heat transfer surface 29 on which a herringbone corrugated pattern (not shown) is formed is provided. As shown in FIGS. 4, 9, and 10, the second heat transfer plate 2 is provided with

convex portions

24, 26, and 28 that protrude to the front side in the stacking direction with respect to the heat transfer surface 29. Yes. The passage holes 23, 25 and 27 are provided on the top surfaces of the

convex portions

24, 26 and 28. The top surfaces of the

protrusions

24, 26, and 28 are the back surfaces of the partition plates 4 adjacent to each other on the front side in the stacking direction or the back surfaces of the other second heat transfer plates 3 (opposite the heat transfer surfaces 39 shown in FIG. 11). In contact with the surface). In addition, the convex part 24 and the convex part 26 are provided so that it may continue.

<Specific Configuration of First Heat Exchange Unit and Second Heat Exchange Unit>
The first heat exchange unit 10 includes, for example, four first heat transfer plates 1 and one first entrance / exit plate 5. The four first heat transfer plates 1 and the first first entrance / exit plate 5 are arranged and stacked such that their longitudinal directions are along the vertical direction. Each first heat transfer plate 1 is arranged such that the passage hole 11 is positioned above or below the passage hole 12 in the vertical direction. The first inlet / outlet plate 5 is disposed such that the second inlet 51 of the second fluid is positioned below the second outlet 52 in the vertical direction.

In the first heat exchange unit 10, the first heat transfer plate 1 adjacent to the first inlet / outlet plate 5 has passage holes 11 and 12 that are respectively connected to the second inlet 51 and the second outlet 52 of the first inlet / outlet plate 5. It is connected. In other words, the spaces including the passage holes 11 and 12 and the heat transfer surface 17 formed between the first inlet / outlet plate 5 and the first heat transfer plate 1 are respectively the second inlet 51 and the second outlet 52. Connected with.

The other first heat transfer plate 1 adjacent to the first heat transfer plate 1 on the rear side (back side) of the first heat transfer plate 1 has passage holes 11 and 12, respectively, of the first heat transfer plate 1. The passage holes 13 and 15 are connected to the passage holes 13 and 15, and the passage holes 13 and 15 are connected to the passage holes 11 and 12 of the first heat transfer plate 1, respectively. Furthermore, the other first heat transfer plate 1 adjacent to the other first heat transfer plate 1 on the rear side (back side) of the other first heat transfer plate 1 has passage holes 11 and 12 respectively. The passage holes 13 and 15 are connected to the other first heat transfer plates 1, and the passage holes 13 and 15 are connected to the passage holes 11 and 12 of the other first heat transfer plates 1, respectively.

Speaking from a different point of view, one first heat transfer plate 1 and the other first heat transfer plate 1 that are adjacent to each other in the first heat exchange unit 10 are, as viewed from the stacking direction, of each first heat transfer plate 1. They are arranged so as to be point-symmetric with respect to the center.

As a result, the space including the heat transfer surface 17 formed between the first inlet / outlet plate 5 and the first heat transfer plate 1 is formed in the passage hole 12 of the first heat transfer plate 1 and the other first heat transfer plate. Via the passage hole 15 of the plate 1, it is connected to a space including the heat transfer surface 17 formed between the other first heat transfer plate 1 and the other first heat transfer plate 1.

In the first heat exchange unit 10, the first heat transfer plate 1 disposed at a position farthest from the first entrance / exit plate 5 has the passage holes 11 and 12 connected to the passage holes 43 and 41 of the partition plate 4, respectively. . In other words, as shown in FIG. 4 and FIG. 7, the passage holes 41 and 43 of the partition plate 4 are separated from the passage holes 12 and 11 of the first heat transfer plate 1 disposed farthest from the first inlet / outlet plate 5. Connected with each. Further, the passage holes 41 and 43 of the partition plate 4 are respectively connected to the passage holes 27 and 25 of the second heat transfer plate 2 arranged farthest from the second entrance / exit plate 6.

The second heat exchange unit 20 is composed of, for example, four stacked second

heat transfer plates

2 and 3. The four second

heat transfer plates

2 and 3 are arranged such that their longitudinal directions are along the vertical direction. Each second heat transfer plate 2 is disposed such that the passage hole 21 is positioned below the passage hole 22 in the vertical direction. Each second heat transfer plate 3 is disposed such that the passage hole 31 is positioned below the passage hole 33 in the vertical direction. The second inlet / outlet plate 6 is arranged such that the third inlet 63 of the third flow body is positioned below the third outlet 64 in the vertical direction.

In the second heat exchange unit 20, the second heat transfer plate 2 adjacent to the partition plate 4 has passage holes 27 and 25 connected to the passage holes 41 and 43 of the partition plate 4, respectively. The other second heat transfer plate 3 adjacent to the second heat transfer plate 2 on the rear side (back side) of the second heat transfer plate 2 has passage holes 31, 33, 35, 36, and 38 respectively. 2 It is connected to the passage holes 21, 22, 23, 25, 27 of the heat transfer plate 2.

Furthermore, the other second heat transfer plate 2 adjacent to the other second heat transfer plate 3 on the rear side (rear side) of the other second heat transfer plate 3 includes passage holes 21, 22, 23, 25 and 27 are connected to the passage holes 31, 33, 35, 36 and 38 of the other second heat transfer plate 3, respectively.

In the second heat exchange unit 20, the second heat transfer plate 3 adjacent to the second inlet / outlet plate 6 has passage holes 31 and 33 that are respectively connected to the third inlet 63 and the third outlet 64 of the second inlet / outlet plate 6. It is connected.

In the first heat exchange unit 10, the flow path 7 b of the first fluid includes the heat transfer surface 17 of the first heat transfer plate 1 in which the passage holes 12 and 11 are respectively disposed below and above in the vertical direction, and the first heat exchange unit 10. It is formed between the heat transfer plate 1 and the heat transfer surface 17 of the first heat transfer plate 1 which is adjacent to the front side and in which the passage holes 11 and 12 are respectively arranged below and above in the vertical direction.

In the first heat exchange unit 10, the flow path 8 of the second fluid includes the heat transfer surface 17 of the first heat transfer plate 1 in which the passage holes 11 and 12 are respectively arranged below and above in the vertical direction, and the first heat exchange unit 10. It is formed between the heat transfer plate 1 and the heat transfer surface 17 of the first heat transfer plate 1 which is adjacent to the front side and in which the passage holes 12 and 11 are respectively arranged below and above in the vertical direction.

In the second heat exchange unit 20, the flow path 7 a for the first fluid is formed in the passage holes 25 and 36 of the second

heat transfer plates

2 and 3 that are provided so as to overlap with each other in the stacking direction. Has been.

In the second heat exchange unit 20, the flow path 7 d of the first fluid is provided between the heat transfer surface 39 of the second heat transfer plate 3 and the second heat transfer plate 2 adjacent to the second heat transfer plate 3 on the front side. It is formed between the hot surface 29. In the second heat exchange unit 20, the flow path 9 of the third fluid is provided between the heat transfer surface 29 of the second heat transfer plate 2 and the second heat transfer plate 3 adjacent to the second heat transfer plate 2 on the front side. It is formed between the hot surface 39.

Thereby, in the first heat exchange unit 10, a plurality of first fluid flow paths 7b are provided in parallel with each other, and a plurality of second fluid flow paths 8 are provided in parallel with each other. The first fluid flow path 7b and the second fluid flow path 8 are provided adjacent to each other with the heat transfer surface 17 of each first heat transfer plate 1 interposed therebetween. The second heat exchange unit 20 includes a plurality of first fluid flow paths 7d in parallel with each other, and a plurality of third fluid flow paths 9 in parallel with each other. The first fluid flow path 7d and the third fluid flow path 9 are provided adjacent to each other with the heat transfer surfaces 29 and 39 of the second

heat transfer plates

2 and 3 interposed therebetween. In the second heat exchange unit 20, the first fluid flow path 7 a is provided so as to reach the first heat exchange unit 10 without passing through the space including the heat transfer surfaces 29 and 39 of the second

heat transfer plates

2 and 3. It has been.

The first fluid that has flowed into the plate heat exchanger 100 from the first inlet 61 reaches the first heat exchange unit 10 without exchanging heat with the third fluid or the like in the second heat exchange unit 20. The first heat exchange unit 10 exchanges heat with the second fluid for the first time. The first fluid that has exchanged heat with the second fluid reaches the second heat exchange unit 20, and further exchanges heat with the third fluid in the second heat exchange unit 20.

The plate heat exchanger 100 is connected to, for example, a compressor, an expansion valve, and other heat exchangers in a refrigeration cycle apparatus. The first inlet 61, the first outlet 62, the second inlet 51, the second outlet 52, the third inlet 63, and the third outlet 64 are a compressor, an expansion valve, and other heat exchangers. And a refrigerant pipe through which the refrigerant flows, a pipe through which water or antifreeze liquid flows, and the like. The first inflow port 61, the first outflow port 62, the second inflow port 51, the second outflow port 52, the third inflow port 63, the third outflow port 64, and each pipe may be connected by any method. For example, it may be connected by brazing. In addition, the first inlet 61, the first outlet 62, the second inlet 51, the second outlet 52, the third inlet 63, the third outlet 64 and the pipe each have a flange portion, The flange portions may be connected by being fastened or joined together.

<Effect>
Next, the effect of the plate heat exchanger 100 will be described.

The plate heat exchanger 100 has a first surface and a second surface opposite to the first surface, and the first heat exchange unit 10 for exchanging heat between the first fluid and the second fluid; , Having a third surface and a fourth surface opposite to the third surface, arranged such that the second surface and the third surface of the first heat exchange unit 10 are connected, and The 1st heat exchange unit 10 is equipped with the 2nd heat exchange unit 20 for the heat exchange of the 1st fluid and the 3rd fluid which were heat-exchanged. The first heat exchange unit 10 includes a second inlet 51 and a second outlet 52 for entering and leaving the second fluid. The second heat exchange unit 20 includes a first inlet 61 and a first outlet 62 for entering and leaving the first fluid, and a third inlet 63 and a third outlet 64 for entering and leaving the third fluid. Including. The first inflow port 61 and the first outflow port 62 are provided on the fourth surface of the second heat exchange unit 20. The second inlet 51 and the second outlet 52 are provided on the first surface of the first heat exchange unit 10. The third inlet 63 and the third outlet 64 are provided on the fourth surface of the second heat exchange unit 20.

If it does in this way, each inflow port and outflow port of the 1st fluid, the 2nd fluid, and the 3rd fluid are provided on the same surface to the 1st heat exchange unit 10 or the 2nd heat exchange unit 20. . Therefore, the connection between the first inlet 61 of the first fluid and the external pipe and the connection between the first outlet 62 and the external pipe can be continuously performed. Furthermore, the connection between the second inlet 51 of the second fluid and the external pipe, and the connection between the second outlet 52 and the external pipe can be performed continuously. Furthermore, the connection between the third inlet 63 of the third fluid and the external piping, and the connection between the third outlet 64 and the external piping can be continuously performed. That is, according to the plate heat exchanger 100, the connection between each inlet / outlet and the external pipe can be continuously performed for each fluid. Therefore, it is easy to connect each inlet / outlet and the external pipe. Therefore, the workability of the connection can be improved.

In addition, the plate heat exchanger 100 is not provided with a flow path for distributing a part of the first fluid and the remaining part and then joining them. Therefore, the plate heat exchanger 100 has a simple structure.

Further, a refrigeration cycle apparatus (for example, a refrigeration cycle apparatus 200 (see FIG. 14) described later) provided with a plate heat exchanger 100 has plate-type heat in which an inlet / outlet is not provided on the same surface for each fluid. Compared with a refrigeration cycle apparatus including an exchanger, the piping can be easily handled. Therefore, the said refrigeration cycle apparatus provided with the plate-type heat exchanger 100 can be reduced in size compared with the refrigeration cycle apparatus in which the inlet / outlet is not provided on the same surface for every fluid.

Further, according to the plate heat exchanger 100, the first fluid exchanged with the second fluid in the first heat exchange unit 10 is heated with the third fluid in the second heat exchange unit 20. Since they are exchanged, the first fluid can be subjected to heat exchange in two stages. Therefore, the plate heat exchanger 100 can improve the heat exchange efficiency as compared with the plate heat exchanger that exchanges heat with the first fluid in one stage.

In the plate heat exchanger 100, each of the plurality of first heat transfer plates 1 has four passage holes for circulating the first fluid or the second fluid. Each of the plurality of second

heat transfer plates

2 and 3 has five passage holes for allowing the first fluid or the third fluid to flow therethrough. In this way, the first fluid flow path 7b and the second fluid flow path 8 can be formed in the first heat exchange unit 10 including the first heat transfer plate 1, and the second heat transfer unit 10 can be formed. In the second heat exchange unit 20 including the

heat plates

2 and 3, the flow path 7 a and the flow path 7 d for the first fluid and the flow path 9 for the third fluid can be formed. As a result, the plate heat exchanger 100 can exchange heat with the first fluid in two stages.

(Embodiment 2)
Next, a plate heat exchanger 101 according to Embodiment 2 will be described with reference to FIG. The plate heat exchanger 101 according to the second embodiment basically has the same configuration as the plate heat exchanger 100 according to the first embodiment, but flows out from the first outlet 62 of the first fluid. The first fluid is different in that it is provided so as to be able to flow in as the third fluid from the third inlet 63 of the third fluid.

Specifically, outside of the plate heat exchanger 101, the first outflow from the first outlet 62 to the outside of the plate heat exchanger 101 is between the first outlet 62 and the third inlet 63. A first fluid flow path 7 e for allowing one fluid to flow into the plate heat exchanger 101 from the third inlet 63 is formed. The first fluid channel 7e connects between the first fluid channel 7d and the first fluid channel 7f. The flow path 7f of the first fluid corresponds to the flow path 9 of the third fluid in the plate heat exchanger 100 shown in FIG. That is, in the refrigeration cycle apparatus including the plate heat exchanger 101, one end and the other end are connected to the first outlet 62 and the third inlet 63, respectively, and a piping part that constitutes the first fluid flow path 7e is further provided. I have.

14, the refrigeration cycle apparatus 200 including the plate heat exchanger 101 further includes, for example, a compressor 71, an expansion valve 72, an evaporator 73, an injection expansion valve 74, and a pump 75. In the plate heat exchanger 101, the first inlet 61 is connected to the discharge side of the compressor 71. In FIG. 14, for convenience of explanation, each flow path of the first fluid and the second fluid in the plate heat exchanger 101 (the first flow path formed between the first inlet 61 and the first outlet 62 is used. The

fluid flow paths

7a, 7b, 7c, 7d, the first fluid flow path 7f formed between the third inlet 63 and the third outlet 64, and the second inlet 51 and the second outlet. The flow path 8) of the second fluid formed between the first fluid 52 and the fluid 52 is shown in a straight line.

The first inlet 61 of the plate heat exchanger 101 is connected to the discharge side of the compressor 71. The first outlet 62 is connected to the expansion valve 72 and is connected to the injection expansion valve 74. The third inlet 63 is connected to the injection expansion valve 74. The third outlet 64 is connected (injected) to an intermediate portion of the compressor 71. In other words, a pipe branched from the pipe connecting between the first outlet 62 and the expansion valve 72 is formed, and the pipe is connected to the third inlet 63 via the injection expansion valve 74. The evaporator 73 is disposed between the expansion valve 72 and the compressor 71. The second inlet 51 is connected to the pump 75. The refrigeration cycle apparatus 200 further includes a housing 76 that houses the plate heat exchanger 101, the compressor 71, the expansion valve 72, the evaporator 73, the injection expansion valve 74, and the pump 75. As shown in FIGS. 14 and 15, the casing 76 is provided with

connection pipes

77 and 78 for allowing the second fluid to enter and exit the refrigeration cycle apparatus 200. The

connection pipes

77 and 78 are connected to the second outlet 52 and the second inlet 51 of the plate heat exchanger 101, respectively. At this time, the first fluid (third fluid) is a refrigerant, and the second fluid is water or antifreeze (brine).

The plate heat exchanger 101 is provided so that the first fluid flowing out from the first outlet 62 of the first fluid can flow in as the third fluid from the third inlet 63 of the third fluid. Therefore, the plate heat exchanger 101 can exchange heat with the first fluid in three stages.

The plate heat exchanger 101 uses a first fluid as a refrigerant and a second fluid as water or antifreeze liquid (brine), so that the refrigeration cycle as an air conditioner or refrigeration apparatus using water or antifreeze liquid (brine) as a heat source. Suitable for the device 200. For example, the first fluid is condensed by exchanging heat with the second fluid in the first heat exchange unit 10. The condensed first refrigerant is decompressed by the injection expansion valve 74 after passing through the second heat exchange unit 20. The decompressed first refrigerant is heat-exchanged with the condensed first refrigerant in the second heat exchange unit 20. Thereby, according to plate type heat exchanger 101 and refrigeration cycle device 200, the 1st fluid can be supercooled.

Further, in the refrigeration cycle apparatus 200, the first inlet 61, the first outlet 62, the third inlet 63, and the third outlet 64 all allow the first fluid as the refrigerant to enter and exit. In the plate heat exchanger 100, the first inlet 61, the first outlet 62, the third inlet 63, and the third outlet 64 are all the second inlet / outlet plates in the second heat exchange unit 20. 6 (on the same plane). Therefore, each of the first inlet 61, the first outlet 62, the third inlet 63, and the third outlet 64 is continuously connected to the external pipe (the internal pipe of the refrigeration cycle apparatus 200). Can do. Moreover, according to the plate type heat exchanger 101, since the handling of external piping (internal piping of the refrigeration cycle apparatus 200) can be simplified, the refrigeration cycle apparatus 200 can be reduced in size.

In the plate heat exchanger 101, the second inlet 51 and the second outlet 52 are both provided on the first inlet / outlet plate 5 (on the same plane) in the first heat exchange unit 10. Therefore, the

connection pipes

77 and 78 are provided on the same plane in the casing 76 of the refrigeration cycle apparatus 200. Therefore, according to the refrigeration cycle apparatus 200, each of the

connection pipes

77 and 78 and the external pipe can be continuously connected. Further, according to the refrigeration cycle apparatus 200, the handling of the external pipe can be simplified. Thereby, for example, even when a plurality of refrigeration cycle apparatuses 200 are installed side by side, it is possible to save the installation space.

<Modification>
In the plate heat exchanger 100 according to the first embodiment and the second embodiment, the number of the first heat transfer plates 1 and the number of the second heat transfer plates 2 are the same, but the present invention is not limited to this. For example, referring to FIG. 16, the number of first heat transfer plates 1 included in first heat exchange unit 10 is greater than the number of second

heat transfer plates

2 and 3 included in second heat exchange unit 20. Also good. For example, the first heat exchange unit 10 may include six first heat transfer plates 1 with respect to the second heat exchange unit 20 including the four second

heat transfer plates

2 and 3. If it does in this way, the field which can exchange heat between the 1st fluid and the 2nd fluid in the 1st heat exchange unit 10 can be enlarged.

The specific configuration of each plate of the

plate heat exchangers

100 and 101 according to the first and second embodiments is not limited to the configuration shown in FIGS.

Referring to FIG. 17, for example, in the second heat transfer plate 3, the passage hole of the second heat transfer plate through which the first fluid flows is the center of the second heat transfer plate 3 in the horizontal direction (for example, the short direction). And a first passage hole 38 disposed below the vertical direction (for example, the longitudinal direction) and a second passage hole 35 disposed above the first passage hole 38 in the vertical direction. May be. In this way, when the first fluid flows from the first passage hole 38 to the second passage hole 35 on the heat transfer surface 39 of the second heat transfer plate 3 from below in the vertical direction to above, the first fluid Can be prevented from flowing asymmetrically in the horizontal direction. Therefore, for example, even when the first fluid heat-exchanged in the first heat exchange unit 10 flows into the second heat exchange unit 20 in a gas-liquid two-phase state, the first fluid remains on the second heat transfer plate 3. The distribution characteristics of the first fluid in the

plate heat exchangers

100 and 101 can be improved.

Referring to FIG. 18, the planar shape of the first heat transfer plate 1 may be, for example, a trapezoidal shape. At this time, for example, when the first fluid that is in the gas state at the time of inflow in the first heat exchange unit 10 is condensed and flows out in the liquid state, the upper side that is arranged above the vertical direction in the first heat transfer plate 1. It is preferable that the length is longer than the length of the lower side arranged below in the vertical direction. In this way, as shown in FIG. 4, in the first heat exchange unit 10, the first fluid flows from the upper side to the lower side in the vertical direction. By narrowing, the flow rate of the first fluid can be increased on the first heat transfer plate 1. As a result, the amount of heat exchange between the first fluid and the second fluid in the first heat exchange unit 10 can be increased. In addition, the plate type heat exchanger provided with such a 1st heat-transfer plate 1 also has the planar shape of the 2nd heat-

transfer plates

2 and 3, the partition plate 4, and the 1st and 2nd entrance-and-

exit plates

5 and 6, It is only necessary to have the same shape as the planar shape of the heat transfer plate 1.

In the

plate heat exchangers

100 and 101 according to the first and second embodiments, the second inlet 51 for the second fluid and the third inlet 63 for the third fluid are the first and second inlet / outlet plates. The second outflow port 52 and the third outflow port 64 are provided above the first and second inlet /

outlet plates

5 and 6 in the vertical direction below the

vertical directions

5 and 6, respectively. It is not a thing. The second inlet 51 and the third inlet 63 are vertically above the first and second inlet /

outlet plates

5 and 6, and the second outlet 52 and the third outlet 64 are the first and second inlet /

outlet plates

5 and 5. 6 may be respectively provided below the vertical direction. In the

plate heat exchangers

100 and 101, the second inlet 51, the second outlet 52, the third inlet 63, and the third outlet 64 are the same in the first heat exchange unit 10 and the second heat exchange unit 20. Considering the state of each fluid and the distribution characteristics of each fluid on the first heat transfer plate 1 and the second

heat transfer plates

2, 3, the positional relationship on the first and second inlet /

outlet plates

5, 6 is determined. It can be changed as appropriate. In addition, by doing so, the flow of each fluid in the first heat exchange unit 10 and the second heat exchange unit 20 can be set to a counter flow or a parallel flow.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 1st heat transfer plate, 2, 3 2nd heat transfer plate, 4 partition plate, 5 1st entrance / exit plate, 6 2nd entrance / exit plate, 7a, 7b, 7c, 7d, 7e, 7f, 8, 9 flow path, 10 1st heat exchange unit, 11, 12, 13, 15, 21, 22, 23, 25, 27, 31, 33, 35, 36, 38, 41, 43 passage hole, 14, 16, 24, 26, 28 , 42, 44 convex part, 17, 29, 39 heat transfer surface, 20 second heat exchange unit, 45 surface, 51 second inlet, 52 second outlet, 61 first inlet, 62 first outlet, 63 3rd inlet, 64 3rd outlet, 71 compressor, 72 expansion valve, 73 evaporator, 74 injection expansion valve, 75 pump, 76 housing, 77, 78 connection piping, 100, 101 plate type heat exchange Vessel, 200 refrigeration cycle apparatus.

Claims

A first heat exchange unit having a first surface and a second surface facing the first surface, wherein the first fluid and the second fluid exchange heat;
A third surface and a fourth surface opposite to the third surface, wherein the second surface and the third surface of the first heat exchange unit are connected to each other; and The first fluid exchanged in the first heat exchange unit and a second heat exchange unit for exchanging heat with the third fluid;
The first heat exchange unit includes a second inlet and a second outlet for entering and exiting the second fluid,
The second heat exchange unit includes a first inlet and a first outlet for entering and leaving the first fluid, and a third inlet and a third outlet for entering and leaving the third fluid,
The first inlet and the first outlet are provided on the fourth surface of the second heat exchange unit;
The second inlet and the second outlet are provided on the first surface of the first heat exchange unit;
The plate-type heat exchanger, wherein the third inflow port and the third outflow port are provided on the fourth surface of the second heat exchange unit.
2. The plate according to claim 1, wherein the first fluid flowing out from the first outlet of the first fluid is provided so as to be able to flow in as the third fluid from the third inlet of the third fluid. Type heat exchanger.
The first heat exchange unit includes a plurality of first heat transfer plates,
The second heat exchange unit includes a plurality of second heat transfer plates,
The plate-type heat exchanger according to claim 1 or 2, wherein the number of the first heat transfer plates is equal to or greater than the number of the second heat transfer plates.
Each of the plurality of first heat transfer plates has four passage holes for circulating the first fluid or the second fluid,
4. The plate heat exchanger according to claim 3, wherein each of the plurality of second heat transfer plates has five passage holes through which the first fluid or the third fluid flows.
The passage hole of the second heat transfer plate through which the first fluid flows is positioned in the center of the second heat transfer plate in the horizontal direction and is disposed below the vertical direction; The plate-type heat exchanger according to claim 4, further comprising a second passage hole disposed vertically above the one passage hole.
A refrigeration cycle apparatus comprising: the plate heat exchanger according to any one of claims 1 to 5; and a compressor for discharging the first fluid to the plate heat exchanger.
The first fluid and the third fluid include a refrigerant,
The refrigeration cycle apparatus according to claim 6, wherein the second fluid includes at least one of antifreeze or water.