Heat exchanger

Abstract

To provide a heat exchanger which can detect a joined state in the same flow passage that cannot be detected in a lamination type heat exchanger.SOLUTION: A heat exchanger is formed by alternately laminating a plurality of first metal plates and a plurality of second metal plates joined by diffusion junction. At the plurality of first metal plates, a first partition wall and a plurality of first protrusions are provided. At the plurality of second metal plates, a second partition wall and a plurality of second protrusions are provided. Any one of the plurality of first protrusions and any one of the plurality of second protrusions overlap alternately in the lamination direction. At any one of the plurality of first protrusions and at any one of the plurality of second protrusions, a first through-hole is formed at the first protrusion, and a second through-hole is formed at the second protrusion. The first through-hole is formed at the first partition wall at a portion where the first protrusion is provided, and the second through-hole is formed at the second partition wall at a portion where the second protrusion is provided. A first passage in which the first through-hole and the second through-hole are connected in the lamination direction is formed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a stacked heat exchanger. [Background technology]

[0002] There is a laminated heat exchanger in which multiple metal plates with flow paths formed therein are stacked and bonded by diffusion bonding. The multiple metal plates are provided with protrusions that form the flow paths for the fluid. The protrusions not only form the flow paths, but also function as columnar protrusions that prevent the flow paths in the metal plates from being crushed by pressure applied in the thickness direction of the metal plates when diffusion bonding is performed (see, for example, Patent Document 1). Furthermore, the protrusions also function as a pressure-resistant structure against the fluid pressure of the fluid flowing through the flow paths.

[0003] To obtain the above-mentioned functions, the stacked metal sheets must be reliably bonded together by diffusion bonding. For example, the outer peripheries of the metal sheets in the stacking direction must be reliably bonded together by diffusion bonding, and the protrusions and the metal sheets located above the protrusions must be reliably bonded together by diffusion bonding.

[0004] For this reason, in such heat exchangers, a leak test is performed to check the bonding state between the metal plates integrated by diffusion bonding. A known method of leak testing is a helium leak test using helium gas, and includes the vacuum enclosure method (vacuum hood method) and the vacuum container method (bell jar method). These leak tests can also be applied when a hole is opened in the partition wall separating the high-temperature flow path and the low-temperature flow path in a configuration in which the high-temperature flow path and the low-temperature flow path are alternately arranged, such as in a stacked heat exchanger. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-096581 A Summary of the Invention [Problem to be solved by the invention]

[0006] The above detection method is applicable when the joint defect is exposed to the outside of the heat exchanger or when a hole occurs between partition walls stacked vertically in the stacking direction. However, the above detection method cannot detect insufficient joint between a protrusion formed inside the heat exchanger and a metal plate located above the protrusion.

[0007] This is because the protrusion is not exposed to the outside of the heat exchanger, and even if an attempt is made to detect a leak by blocking one of the inlet / outlet ports of the flow path and applying pressure or pressure from the other inlet / outlet, no leak will occur, because the joint between the protrusion and the partition above it and other locations form the same flow path through which the same fluid flows.

[0008] In view of the above circumstances, an object of the present invention is to provide a heat exchanger that makes it possible to detect the state of bonding within the same flow path when a leak test is used, which cannot be detected in a stacked heat exchanger. [Means for solving the problem]

[0009] In order to achieve the above object, a heat exchanger according to one embodiment of the present invention is a heat exchanger including a laminated block body in which a plurality of metal plates are laminated and bonded by diffusion bonding. The laminated block body includes a plurality of first metal plates and a plurality of second metal plates, and the plurality of first metal plates and the plurality of second metal plates are alternately laminated in the laminated block body. Each of the plurality of first metal plates is provided with a first partition wall and a plurality of first projections protruding from the first partition wall. Each of the second metal plates is provided with a second partition wall and a plurality of second projections protruding from the second partition wall. Any of the plurality of first projections and any of the plurality of second projections overlap each other alternately in the stacking direction of the laminated block body. In any one of the multiple first protrusions and any one of the multiple second protrusions, which are alternately stacked in the stacked block body, a first through hole is formed in the first protrusion extending in the stacking direction, and a second through hole is formed in the second protrusion extending in the stacking direction. The first through hole is formed in the first partition wall in a portion where any of the multiple first protrusions is provided, and the second through hole is formed in the second partition wall in a portion where any of the multiple second protrusions is provided. In the laminated block body, a first passage is formed in which the first through holes and the second through holes are alternately connected in the laminated direction.

[0010] According to such a heat exchanger, when a leak test is performed, it is possible to detect the state of bonding within the same flow passage, which cannot be detected in a stacked type heat exchanger.

[0011] The heat exchanger may further include a ceiling panel and a floor panel that sandwich the stacking block body in the stacking direction and are joined to the stacking block body by diffusion bonding, and at least one of the ceiling panel and the floor panel may have a second passage formed therein that penetrates in the stacking direction and is connected to the first passage.

[0012] According to such a heat exchanger, when a leak test is performed, the state of bonding within the same flow passage, which cannot be detected in a stacked type heat exchanger, can be detected more reliably.

[0013] In the heat exchanger, each of the multiple first metal plates may have a first region in which the area per unit area occupied by the first protrusions is relatively large, and a second region in which the area per unit area occupied by the first protrusions is relatively small, and the first through holes may be formed in the first protrusions arranged in the second region.

[0014] According to such a heat exchanger, when a leak test is performed, the state of bonding within the same flow passage, which cannot be detected in a stacked type heat exchanger, can be detected more reliably.

[0015] In the heat exchanger, each of the multiple second metal plates may have a third region in which the area per unit area occupied by the second protrusions is relatively large, and a fourth region in which the area per unit area occupied by the second protrusions is relatively small, and the second through holes may be formed in the second protrusions arranged in the fourth region.

[0016] According to such a heat exchanger, when a leak test is performed, the state of bonding within the same flow passage, which cannot be detected in a stacked type heat exchanger, can be detected more reliably.

[0017] In the heat exchanger, the first metal plate may have a first recess in which the first projection is disposed, and a first outer periphery surrounding the first recess.

[0018] According to such a heat exchanger, when a leak test is performed, the state of bonding within the same flow passage, which cannot be detected in a stacked type heat exchanger, can be detected more reliably.

[0019] In the heat exchanger, the second metal plate may have a second recess in which the second projection is disposed, and a second outer circumferential portion surrounding the second recess.

[0020] According to such a heat exchanger, when a leak test is performed, the state of bonding within the same flow passage, which cannot be detected in a stacked type heat exchanger, can be detected more reliably.

[0021] In the heat exchanger, each of the multiple first metal plates has a first flow path formed between the multiple first protrusions and a first inlet / outlet header communicating with the first flow path, the multiple first protrusions include a first protrusion portion arranged along the first inlet / outlet header, and the first through hole may be formed in the first protrusion portion.

[0022] According to such a heat exchanger, when a leak test is performed, the state of bonding within the same flow passage, which cannot be detected in a stacked type heat exchanger, can be detected more reliably.

[0023] In the heat exchanger, each of the multiple second metal plates has a second flow path formed between the multiple second protrusions and a second inlet / outlet header communicating with the second flow path, the multiple second protrusions include a second protrusion portion arranged along the second inlet / outlet header, and the second through hole may be formed in the second protrusion portion.

[0024] According to such a heat exchanger, when a leak test is performed, the state of bonding within the same flow passage, which cannot be detected in a stacked type heat exchanger, can be detected more reliably. Effect of the Invention

[0025] As described above, according to the present invention, a heat exchanger is provided that makes it possible to detect the state of bonding within the same flow passage, which cannot be detected in a stacked type heat exchanger, when a leak test is utilized. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is a schematic perspective view showing the heat exchanger of the present embodiment. [Diagram 2] FIG. 2 is a schematic perspective view showing metal plates forming a laminated block body before being diffusion-bonded. [Diagram 3] Figure (a) is a schematic perspective view showing a metal plate forming a ceiling panel before diffusion bonding, and Figure (b) is a schematic perspective view showing a metal plate forming a floor panel before diffusion bonding. [Figure 4] FIG. 2 is a schematic cross-sectional view showing an example of a cross section of a heat exchanger formed after diffusion bonding. [Diagram 5] FIG. 4 is a schematic cross-sectional view showing an example of the operation of the present embodiment. [Figure 6] 13 is a schematic plan view of a metal plate according to a first modified example of a laminated block body. FIG. [Figure 7] Fig. 1(a) is a schematic plan view of a metal plate according to a first modified example of a ceiling panel, and Fig. 1(b) is a schematic plan view of a metal plate according to a first modified example of a floor panel. [Figure 8]13 is a schematic plan view of a metal plate according to a second modified example of a laminated block body. FIG. [Figure 9] Fig. 1(a) is a schematic plan view of a metal plate according to a second modified example of a ceiling panel, and Fig. 1(b) is a schematic plan view of a metal plate according to a second modified example of a floor panel. [Figure 10] 13 is a schematic plan view of a metal plate according to a third modified example of a laminated block body. FIG. [Figure 11] Fig. 1(a) is a schematic plan view of a metal plate according to a third modified example of a ceiling panel, and Fig. 1(b) is a schematic plan view of a metal plate according to a third modified example of a floor panel. [Figure 12] 13 is a schematic plan view of a metal plate according to a fourth modified example of a laminated block body. FIG. [Figure 13] Fig. 1(a) is a schematic plan view of a metal plate according to a fourth modified example of a ceiling panel, and Fig. 1(b) is a schematic plan view of a metal plate according to a fourth modified example of a floor panel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, XYZ axis coordinates may be introduced. In addition, the same reference numerals may be used for the same components or components having the same functions, and after the components are described, the description may be omitted as appropriate. In addition, the form of each component shown below is an example, and is not limited to this example.

[0028] 1 is a schematic perspective view showing a heat exchanger of the present embodiment. The heat exchanger 1 shown in Fig. 1 is a laminated type heat exchanger, and includes a laminated block body 2, a ceiling panel 3, and a floor panel 4.

[0029] The laminated block body 2 is sandwiched between a ceiling plate 3 and a floor plate 4 in the stacking direction. The laminated block body 2 includes a plurality of metal plates 21 (first metal plates) and a plurality of metal plates 22 (second metal plates). The laminated block body 2 is a block body in which the plurality of metal plates 21 and the plurality of metal plates 22 are alternately stacked and joined by diffusion bonding. Examples of diffusion bonding include solid-state bonding, hot pressure welding, and cold pressure welding. Since high-temperature fluid and low-temperature fluid exchange heat in the laminated block body 2, the metal plates 21 and 22 may be referred to as heat transfer plates.

[0030] The ceiling panel 3 is a block body in which a plurality of metal plates 30 are stacked and joined by diffusion bonding. The floor panel 4 is a block body in which a plurality of metal plates 40 are stacked and joined by diffusion bonding. The ceiling panel 3 and the laminated block body 2 are joined by diffusion bonding. The floor panel 4 and the laminated block body 2 are joined by diffusion bonding. The ceiling panel 3 may be formed from a single metal plate having the same thickness as the thickness of the plurality of stacked metal plates 30, and the floor panel 4 may be formed from a single metal plate having the same thickness as the thickness of the plurality of stacked metal plates 40.

[0031] The heat exchanger 1 has an upper surface 1u formed on the ceiling board 3 side, a lower surface 1d formed on the floor board 4 side, and a side surface 1w connected to the upper surface 1u and the lower surface 1d. An inlet / outlet pipe 53, an inlet / outlet pipe 54, an inlet / outlet pipe 55, and an inlet / outlet pipe 56 are provided on the upper surface 1u. For example, when the heat exchanger 1 is used as a condenser, the inlet / outlet pipe 53 serves as an inlet pipe for a low-temperature fluid (e.g., water), and the inlet / outlet pipe 54 serves as an outlet pipe for the low-temperature fluid. The inlet / outlet pipe 55 serves as an outlet pipe for a high-temperature fluid (e.g., a refrigerant), and the inlet / outlet pipe 56 serves as an inlet pipe for a high-temperature fluid.

[0032] At the four corners of the heat exchanger 1, a header 23, a header 24, a header 25, and a header 26 are formed, which penetrate the ceiling plate 3 and the laminated block body 2 in the stacking direction. The header 23 communicates with an inlet / outlet pipe 53. The header 24 communicates with an inlet / outlet pipe 54. The header 25 communicates with an inlet / outlet pipe 55. The header 26 communicates with an inlet / outlet pipe 56. The headers 25 and 26 are connected to a flow path (described later) provided in the metal plate 21. The headers 23 and 24 are connected to a flow path (described later) provided in the metal plate 22. The upper surface 1u of the heat exchanger 1 is provided with a plurality of passages 60 extending in the stacking direction from the upper surface 1u to the lower surface 1d. The details of the passages 60 will be described later.

[0033] In the figure of this embodiment, solid lines are drawn at the boundaries of each of the multiple metal plates stacked in the stacking direction, but in the diffusion-bonded heat exchanger 1, such solid lines may disappear without being visually recognized. Also, the Z-axis direction shown in the figure corresponds to the stacking direction of the heat exchanger 1, the X-axis direction is approximately perpendicular to the Z-axis direction and corresponds to the direction from the inlet / outlet pipe 55 to the inlet / outlet pipe 53, and the Y-axis direction is approximately perpendicular to the Z-axis direction and the X-axis direction and corresponds to the direction from the inlet / outlet pipe 55 to the inlet / outlet pipe 54.

[0034] The metal plates 21, 22, 30, and 40 have high thermal conductivity and are made of, for example, the same material, such as aluminum, stainless steel, copper, an aluminum alloy, titanium, or a magnesium alloy.

[0035] 2(a) and (b) are schematic perspective views showing metal plates forming the laminated block body before diffusion bonding. Fig. 2(a) shows metal plate 21, and Fig. 2(b) shows metal plate 22.

[0036] As shown in FIG. 2(a), the metal plate 21 has a rectangular planar shape, and is provided with a partition wall 211 (first partition wall), a plurality of protrusions 212 (first protrusions) protruding from the partition wall 211, and an outer periphery (first side wall) 213 surrounding the partition wall 211. The shape of the protrusions 212 when viewed from above is, for example, circular. In the metal plate 21, there is a step between the partition wall 211 and the outer periphery 213, and the partition wall 211 is formed to be thinner than the outer periphery 213. In other words, a recess 216 is formed in the metal plate 21 by the partition wall 211 and the outer periphery 213. The recess 216 is surrounded by the outer periphery 213.

[0037] By providing the partition wall 211 with a plurality of protrusions 212, each of the spaces between the plurality of protrusions 212 on the partition wall 211 (the spaces between adjacent protrusions 212 on the XY-axis plane) becomes a flow path 215 in the metal plate 21. In other words, the flow path 215 is formed in the recess 216. The flow paths 215 are formed by, for example, half-etching. The partition walls 211 and the plurality of protrusions 212 are provided on each of the plurality of metal plates 21 included in the laminated block body 2, for example.

[0038] At the four corners of the metal plate 21, a through hole 231 (first opening), a through hole 241 (second opening), a through hole 251 (third opening), and a through hole 261 (fourth opening) are provided (FIG. 2(a)). Each of the through hole 251 and the through hole 261 functions as an inlet / outlet header communicating with the flow path 215. In addition, in the metal plate 21, a seal portion 2310 formed continuously from the outer circumferential portion 213 is provided on the flow path 215 side of the through hole 231 so as to surround the through hole 231. By providing the seal portion 2310 between the through hole 231 and the flow path 215, the through hole 231 and the flow path 215 are partitioned. In addition, in the metal plate 21, a seal portion 2410 formed continuously from the outer circumferential portion 213 is provided on the flow path 215 side of the through hole 241 so as to surround the through hole 241. A seal portion 2410 is provided between the through hole 241 and the flow path 215, thereby separating the through hole 241 and the flow path 215.

[0039] 2(a), in the metal plate 21, a through hole 2121 (first through hole) penetrating in the stacking direction is formed in any one of the multiple protrusions 212. The through hole 2121 is also formed in the partition wall 211 at a portion where any one of the multiple protrusions 212 is provided. That is, the through hole 2121 penetrates the metal plate 21 in the stacking direction.

[0040] As shown in FIG. 2(b), the metal plate 22 has a rectangular planar shape, and is provided with a partition wall 221 (second partition wall), a plurality of protrusions 222 (second protrusions) protruding from the partition wall 221, and an outer periphery (second side wall) 223 surrounding the partition wall 221. When viewed from above, the protrusions 222 have a shape, for example, a circle. In the metal plate 22, there is a step between the partition wall 221 and the outer periphery 223, and the thickness of the partition wall 221 is formed to be thinner than the thickness of the outer periphery 223. In other words, a recess 226 is formed in the metal plate 22 by the partition wall 221 and the outer periphery 223. The recess 226 is surrounded by the outer periphery 223.

[0041] By providing the partition wall 221 with the multiple protrusions 222, each portion between the multiple protrusions 222 on the partition wall 221 (portions between adjacent protrusions 222 in the XY-axis plane) becomes a flow path 225 of the metal plate 22. In other words, the flow path 225 is formed in the recess 226. The flow path 225 is formed by, for example, half-etching. The partition wall 221 and the multiple protrusions 222 are provided on, for example, each of the multiple metal plates 22 included in the laminated block main body 2.

[0042] At the four corners of the metal plate 22, a through hole 232 (a fifth opening), a through hole 242 (a sixth opening), a through hole 252 (a seventh opening), and a through hole 262 (an eighth opening) are provided (FIG. 2(b)). Each of the through hole 232 and the through hole 242 functions as an inlet / outlet header communicating with the flow path 225. In the metal plate 22, a seal portion 2520 is provided on the flow path 225 side of the through hole 252 so as to surround the through hole 252 and to be continuous from the outer circumferential portion 223. The seal portion 2520 is provided between the through hole 252 and the flow path 225, thereby separating the through hole 252 from the flow path 225. In addition, in the metal plate 22, a seal portion 2620 is provided on the flow path 225 side of the through hole 262 so as to surround the through hole 262 and to be continuous from the outer circumferential portion 223. A seal portion 2620 is provided between the through hole 262 and the flow path 225, thereby separating the through hole 262 and the flow path 225.

[0043] 2(b), in the metal plate 22, a through hole 2221 (second through hole) penetrating in the stacking direction is formed in any one of the multiple protrusions 222. The through hole 2221 is also formed in the partition wall 221 at a portion where any one of the multiple protrusions 222 is provided. That is, the through hole 2221 penetrates the metal plate 21 in the stacking direction.

[0044] For example, when the heat exchanger 1 is used as a condenser, in the metal plate 21, the through hole 261 serves as an inlet for high-temperature fluid and the through hole 251 serves as an outlet for the high-temperature fluid, and in the metal plate 22, the through hole 232 serves as an inlet for low-temperature fluid and the through hole 242 serves as an outlet for the low-temperature fluid.

[0045] By alternately stacking a plurality of metal plates 21 and a plurality of metal plates 22 in the stacking direction, a through hole 231 provided in the metal plate 21 and a through hole 232 provided in the metal plate 22 are connected in the stacking direction to form a header 23 in the stacked block body 2. A through hole 241 provided in the metal plate 21 and a through hole 242 provided in the metal plate 22 are connected in the stacking direction to form a header 24 in the stacked block body 2. A through hole 251 provided in the metal plate 21 and a through hole 252 provided in the metal plate 22 are connected in the stacking direction to form a header 25 in the stacked block body 2. A through hole 261 provided in the metal plate 21 and a through hole 262 provided in the metal plate 22 are connected in the stacking direction to form a header 26 in the stacked block body 2.

[0046] FIG. 3(a) is a schematic perspective view showing a metal plate forming a ceiling panel before diffusion bonding, and FIG. 3(b) is a schematic perspective view showing a metal plate forming a floor panel before diffusion bonding.

[0047] As shown in FIG. 3(a), metal plate 30 has a rectangular planar shape and is provided with a plurality of through holes 31 corresponding to the positions of the through holes (first through hole and second through hole) formed in the protrusion provided on metal plate 21 or metal plate 22.

[0048] At the four corners of the metal plate 30, a through hole 331, a through hole 341, a through hole 351, and a through hole 361 are provided. By stacking a plurality of metal plates 30, the through holes 331 provided in the metal plates 30 are connected in the stacking direction to form the header 23 in the ceiling plate 3. Furthermore, the through holes 341 provided in the metal plates 30 are connected in the stacking direction to form the header 24 in the ceiling plate 3. Furthermore, the through holes 351 provided in the metal plates 30 are connected in the stacking direction to form the header 25 in the ceiling plate 3. Furthermore, the through holes 361 provided in the metal plates 30 are connected in the stacking direction to form the header 26 in the ceiling plate 3. For example, when the heat exchanger 1 is used as a condenser, the through hole 331 serves as an inlet for a low-temperature fluid, the through hole 341 serves as an outlet for a low-temperature fluid, the through hole 361 serves as an inlet for a high-temperature fluid, and the through hole 351 serves as an outlet for a high-temperature fluid. Here, for example, the low-temperature fluid is water, and the high-temperature fluid is a refrigerant that undergoes a phase change between gas and liquid.

[0049] As shown in FIG. 3(b), metal plate 40 has a rectangular planar shape and has a plurality of through holes 41 provided therein corresponding to the positions of the through holes (first through hole and second through hole) formed in the protrusions provided on metal plate 21 or metal plate 22.

[0050] In this embodiment, when a plurality of metal plates 21 (FIG. 2(a)) and a plurality of metal plates 22 (FIG. 2(b)) are alternately stacked in the stacking direction, any of the protrusions 212 provided on the metal plates 21 and any of the protrusions 222 provided on the metal plates 22 alternately overlap in the stacking direction of the stacked block body 2. For example, among the plurality of protrusions 212 provided on each metal plate 21, the protrusions 212 other than the protrusions 212 arranged around the through holes 251 and 261 and, among the plurality of protrusions 222 provided on each metal plate 22, the protrusions 222 arranged along the through holes 232 and 243 alternately overlap in the stacking direction.

[0051] Fig. 4 is a schematic cross-sectional view showing an example of a cross section of a heat exchanger formed after diffusion bonding. Fig. 4 shows cross sections corresponding to the positions along the line A1-A2 shown in Fig. 2(a), the position along the line B1-B2 shown in Fig. 2(b), the position along the line C1-C2 shown in Fig. 3(a), and the position along the line D1-D2 shown in Fig. 3(b).

[0052] As described above, a plurality of metal plates 21 and a plurality of metal plates 22 are alternately stacked and joined by diffusion bonding to form the laminated block body 2. A plurality of metal plates 30 are stacked and joined by diffusion bonding to form the ceiling board 3. A plurality of metal plates 40 are stacked and joined by diffusion bonding to form the floor board 4. The ceiling board 3 and the laminated block body 2 are joined by diffusion bonding, and the floor board 4 and the laminated block body 2 are joined by diffusion bonding.

[0053] Furthermore, the upper surfaces of the protrusions 212 provided on the metal plate 21 are joined to the partition wall 221 of the metal plate 22 arranged on the metal plate 21, so that a flow path 215 is formed in the metal plate 21. The upper surfaces of the protrusions 222 provided on the metal plate 22 are joined to the partition wall 211 of the metal plate 21 arranged on the metal plate 22, or are joined to the metal plate 30, so that a flow path 225 is formed in the metal plate 22.

[0054] Here, when the protrusions 212 provided on the metal plate 21 and the protrusions 222 provided on the metal plate 22 are alternately overlapped, the through holes 2121 provided in the protrusions 212 and the through holes 2221 provided in the protrusions 222 are alternately connected in the stacking direction to form a passage 62 (first passage). That is, the passage 62 penetrating the laminated block main body 2 in the stacking direction is formed.

[0055] Furthermore, when multiple metal plates 40 are stacked, the through holes 41 provided in the metal plates 40 communicate in the stacking direction to form a passage 64. That is, the floor plate 4 is formed with a passage 64 penetrating in the stacking direction. Furthermore, when multiple metal plates 30 are stacked, the through holes 31 provided in the metal plates 30 communicate in the stacking direction to form a passage 63. That is, the ceiling plate 3 is formed with a passage 63 penetrating in the stacking direction. The passage 63 and the passage 64 are collectively referred to as a second passage.

[0056] The passages 62 and 64, and the passages 62 and 63 are connected to each other in the stacking direction to form a passage 60 that penetrates the heat exchanger 1 from the lower surface 1d to the upper surface 1u. The passage 60 is open to the outside of the heat exchanger 1. Note that either the passage 63 provided in the ceiling panel 3 or the passage 64 provided in the floor panel 4 may be omitted. It is sufficient that the passages 62 and 64, or the passages 62 and 63 are connected to each other in the stacking direction.

[0057] Fig. 5 is a schematic cross-sectional view showing an example of the operation of this embodiment. Fig. 5 shows a state in which there is a diffusion bonding defect between one of the upper surfaces of a plurality of protrusions 212 provided on the metal plate 21 and the partition wall 221 of the metal plate 22 arranged on the protrusion 212. For example, in Fig. 5, the bonding defect location is surrounded by a dashed line 100. In this embodiment, the passage 60 of the heat exchanger 1 is used as a bonding defect detection passage.

[0058] For example, when He (helium) gas flows into passage 60 of heat exchanger 1 as a gas for detecting poor bonding, unless protrusion 212 on metal plate 21 and partition wall 221 of metal plate 22 arranged on protrusion 212 are joined by diffusion bonding to connect passage 60 and flow path 215, He gas will not flow from passage 60 into flow path 215 even if inlet / outlet pipe 55 is blocked and a vacuum is drawn from inlet / outlet pipe 56.

[0059] 5, when there is a poor connection point 100 between the protrusion 212 provided on the metal plate 21 and the partition wall 221 arranged on the protrusion 212, connecting the passage 60 and the flow path 215, for example, by closing the inlet / outlet pipe 55 and drawing a vacuum from the inlet / outlet pipe 56 to evacuate the flow path 215 communicating with the inlet / outlet pipe 56 and the through hole 261, the He gas will flow from the passage 60 into the flow path 215 through the poor connection point 100. The He gas that has flowed into the flow path 215 flows to the inlet / outlet pipe 56 via the through hole 261 of the metal plate 21.

[0060] In other words, when He gas is caused to flow into passage 60 of heat exchanger 1, if He gas is detected flowing out from inlet / outlet pipe 56 which is under vacuum, it can be determined that there is a poor bond between the protrusion and the metal plate partition wall placed on top of the protrusion in heat exchanger 1.

[0061] In this way, according to heat exchanger 1, even in a heat exchanger in which the joint of a protrusion causing a joint failure (the joint between the protrusion and the metal plate partition placed on the protrusion) and the flow path other than this joint are flow paths through which the same fluid flows, it is possible to detect the joint failure at this joint.

[0062] (First Modification) The through holes formed in the projections may be provided in specific projections among the plurality of projections.

[0063] For example, when the heat exchanger 1 is in use, the flow path 215 (recess 216) formed by sandwiching the metal plate 21 with the metal plate 22 above it, or the flow path 225 (recess 226) formed by sandwiching the metal plate 22 with the metal plate 21 above it, is subjected to pressure by the fluid that tends to expand in the vertical direction.

[0064] In this case, it is required that the joints between the partition walls of the multiple protrusions, particularly those sparsely arranged on the partition walls or those having a small occupancy area relative to the partition walls (protrusions having a small cross-sectional area when cut in a plane parallel to the XY plane), and the partition walls above them, maintain a strong joint even when pressure is applied by the fluid to expand them in the vertical direction. This is because the pressure applied to each of these protrusions (pressure to expand in the vertical direction) is greater than that applied to protrusions densely arranged on the partition walls or those having a large occupancy area relative to the partition walls (protrusions having a large cross-sectional area when cut in a plane parallel to the XY plane), and if the joint state is insufficient, the joints may easily peel off due to the pressure, or the joints may peel off due to deterioration over time. If the joints peel off, the protrusions will no longer have the power to hold the partition walls against the pressure, so the flow paths may expand in the vertical direction, and the metal plate 21 or the metal plate 22 may be deformed.

[0065] In this way, the joints between protrusions that are sparsely arranged on the partition wall or protrusions that occupy a small area relative to the partition wall and the partition wall above them are required to have sufficient pressure resistance so that the joints do not come apart even when pressure is applied that tends to spread in the vertical direction.

[0066] 6(a) and (b) are schematic plan views of a metal plate according to a first modified example of a laminated block body. FIG. 6(a) shows one metal plate 21 out of a plurality of metal plates 21. FIG. 6(b) shows one metal plate 22 out of a plurality of metal plates 22. FIG. 7(a) is a schematic plan view of a metal plate according to a first modified example of a ceiling plate. FIG. 7(b) is a schematic plan view of a metal plate according to a first modified example of a floor plate.

[0067] 6(a), when the metal plate 21 is viewed from above, the metal plate 21 has a first region (a region surrounded by a broken line 101 in the recess 216) in which the area occupied by the protrusions 212 per unit area in the metal plate 21 is relatively large (the area occupied per unit area means the area occupied per unit area in the recess 216), and a second region (a region outside the region surrounded by the broken line 101 in the recess 216 and surrounded by a broken line 102) in which the area occupied by the protrusions 212 per unit area in the metal plate 21 is relatively small. For example, the area surrounded by the broken line S1 and the area surrounded by the broken line S2 are assumed to be equal in area. It can be seen that the area occupied by the protrusions 212 in the region surrounded by the broken line S1 is larger than the area occupied by the protrusions 212 in the region surrounded by the broken line S2.

[0068] In the metal plate 21, the plurality of protrusions 212 arranged in the first region do not have through holes 2121, but the through holes 2121 are formed in any of the plurality of protrusions 212 arranged in the second region.

[0069] The multiple protrusions 212 arranged in the second region are arranged near the outer periphery 213 or near the seal portions 2310 and 2410, and the area occupied by the multiple protrusions 212 per unit area is relatively smaller than that of the multiple protrusions 212 arranged in the first region. As a result, a stronger pressure to spread in the vertical direction as described above is applied to each of the multiple protrusions 212 arranged in the second region than to each of the multiple protrusions 212 arranged in the first region. Therefore, it is necessary to detect whether any of the multiple protrusions 212 arranged in the second region is sufficiently bonded to the metal plate 22 above it, with priority over the multiple protrusions 212 arranged in the first region.

[0070] For example, any one of the plurality of protrusions 212 arranged in the second region is provided with a through hole 2121. This makes it possible to reliably detect the bonding state between any one of the plurality of protrusions 212 arranged in the second region and the metal plate 22 thereon by a leak test.

[0071] Furthermore, as shown in FIG. 6(b), when metal plate 22 is viewed from above, metal plate 22 has a third region (a region surrounded by dashed line 103 in recess 226) in which the area per unit area of ​​protrusion 222 in metal plate 22 is relatively large, and a fourth region (a region outside the region surrounded by dashed line 103 in recess 226 and surrounded by dashed line 104) in which the area per unit area of ​​protrusion 222 in metal plate 22 is relatively small.

[0072] In the metal plate 22, the plurality of protrusions 222 arranged in the third region are not provided with the through-holes 2221, but the through-holes 2221 are formed in any of the plurality of protrusions 222 arranged in the fourth region.

[0073] The multiple protrusions 222 arranged in the fourth region are arranged near the outer periphery 223, the through holes 232, 242, or the seal portions 2520, 2620, and the area occupied by the multiple protrusions 222 per unit area is relatively smaller than that of the multiple protrusions 222 arranged in the third region. As a result, a stronger pressure to spread in the vertical direction is applied to each of the multiple protrusions 222 arranged in the fourth region than to each of the multiple protrusions 222 arranged in the third region. Therefore, it is necessary to detect whether any of the multiple protrusions 222 arranged in the fourth region is sufficiently bonded to the metal plate 22 above it, with priority over the multiple protrusions 222 arranged in the third region.

[0074] For example, any one of the plurality of protrusions 222 arranged in the fourth region is provided with a through hole 2221. This makes it possible to reliably detect the bonding state between any one of the plurality of protrusions 222 arranged in the fourth region and the metal plate 21 thereon by a leak test.

[0075] In addition, depending on the metal plate 21 related to the first modified example and the metal plate 22 related to the first modified example, the arrangement of the through holes 31 provided in the metal plate 30 forming the ceiling plate 3 is changed (Figure 7(a)), and the arrangement of the through holes 41 provided in the metal plate 40 forming the floor plate 4 is changed (Figure 7(b)).

[0076] (Second Modification) 8(a) and (b) are schematic plan views of metal plates according to a second modified example of the laminated block body. FIG. 8(a) shows one metal plate 21 out of a plurality of metal plates 21. FIG. 8(b) shows one metal plate 22 out of a plurality of metal plates 22. FIG. 9(a) is a schematic plan view of a metal plate according to a second modified example of the ceiling plate. FIG. 9(b) is a schematic plan view of a metal plate according to a second modified example of the floor plate.

[0077] In the metal plate 21, a protrusion whose area when viewed from above (the area of ​​the protrusion on the XY-axis plane) is relatively smaller than the other protrusions may be arranged in the recess 216. For example, as shown in Fig. 8(a), the area of ​​each of the multiple protrusions 212a arranged in the region surrounded by the dashed line 105 is smaller than the area of ​​each of the multiple protrusions 212 arranged in the region surrounded by the dashed line 106. In other words, the multiple protrusions 212a arranged in the region surrounded by the dashed line 105 are arranged so that the area occupied by the protrusions 212a per unit area is relatively smaller than the area of ​​the multiple protrusions 212 arranged in the region surrounded by the dashed line 106.

[0078] As a result, a stronger pressure tends to spread in the vertical direction as described above is applied to each of the plurality of protrusions 212a arranged in the region surrounded by dashed line 105 than to each of the plurality of protrusions 212 arranged in the region surrounded by dashed line 106. Therefore, it is necessary to detect, with priority over the plurality of protrusions 212 arranged in the region surrounded by dashed line 106, whether any of the plurality of protrusions 212a arranged in the region surrounded by dashed line 105 is sufficiently bonded to the metal plate 22 above it.

[0079] For example, any one of the plurality of protrusions 212a arranged in the region surrounded by the dashed line 105 is provided with a through hole 2121. This makes it possible to reliably detect the bonding state between any one of the plurality of protrusions 212a arranged in the region surrounded by the dashed line 105 and the metal plate 22 thereon by a leak test.

[0080] Furthermore, in the metal plate 22, a protrusion whose area when viewed from above (the area of ​​the protrusion on the XY-axis plane) is relatively smaller than the other protrusions may be disposed in the recess 226. For example, as shown in Fig. 8(b), the area of ​​each of the multiple protrusions 222a disposed in the region surrounded by the dashed line 107 is smaller than the area of ​​each of the multiple protrusions 222 disposed in the region surrounded by the dashed line 108. That is, the multiple protrusions 222a disposed in the region surrounded by the dashed line 107 are disposed such that the area occupied by the protrusions 222a per unit area is relatively smaller than the area of ​​the multiple protrusions 222 disposed in the region surrounded by the dashed line 108.

[0081] As a result, a stronger pressure tends to spread in the vertical direction as described above is applied to each of the plurality of protrusions 222a arranged in the region surrounded by dashed line 107 compared to each of the plurality of protrusions 222 arranged in the region surrounded by dashed line 108. Therefore, it is necessary to detect whether any of the plurality of protrusions 222a arranged in the region surrounded by dashed line 107 is sufficiently bonded to the metal plate 21 above it, with priority over the plurality of protrusions 222 arranged in the region surrounded by dashed line 108.

[0082] For example, any one of the plurality of protrusions 222a arranged in the region surrounded by the dashed line 106 is provided with a through hole 2221. This makes it possible to reliably detect the bonding state between any one of the plurality of protrusions 222a arranged in the region surrounded by the dashed line 106 and the metal plate 21 located thereon by a leak test.

[0083] In addition, depending on the metal plate 21 relating to the second modified example and the metal plate 22 relating to the second modified example, the arrangement of the through holes 31 provided in the metal plate 30 forming the ceiling plate 3 is changed (Figure 9(a)), and the arrangement of the through holes 41 provided in the metal plate 40 forming the floor plate 4 is changed (Figure 9(b)).

[0084] (Third Modification) Fig. 10(a) and (b) are schematic plan views of a metal plate according to a third modified example of a laminated block body. Fig. 10(a) shows one metal plate 21 out of a plurality of metal plates 21. Fig. 10(b) shows one metal plate 22 out of a plurality of metal plates 22. Fig. 11(a) is a schematic plan view of a metal plate according to a third modified example of a ceiling plate. Fig. 11(b) is a schematic plan view of a metal plate according to a third modified example of a floor plate.

[0085] 10(a), in the metal plate 21, the multiple protrusions 212 include a protrusion 212b arranged along the through hole 251 and multiple protrusions 212c arranged along the through hole 261. The outer periphery of the protrusion 212b is cut out to fit the inner periphery of the through hole 251, and when viewed from above, the planar shape of the protrusion 212b is a shape in which a part of a circle is recessed in an arc. The outer periphery of each of the multiple protrusions 212c is cut out to fit the inner periphery of the through hole 261, and when viewed from above, the planar shape of each of the multiple protrusions 212c is a shape in which a part of a circle is recessed in an arc.

[0086] In the metal plate 21, a through hole 2121 is formed in the protrusion 212c. Also, a through hole 2121 is formed in one of the multiple protrusions 212c. Also, a through hole 2221 is provided in the seal portion 2520 of the metal plate 22 shown in Fig. 10(b) so as to overlap with the through hole 2121 provided in the protrusion 212b in the stacking direction. Also, a through hole 2221 is provided in the seal portion 2620 of the metal plate 22 so as to overlap with the through hole 2121 provided in the protrusion 212c in the stacking direction.

[0087] The area of ​​each of the protrusions 212b or the multiple protrusions 212c is smaller than the area of ​​each of the multiple protrusions 212 arranged in the region surrounded by the dashed line 101. In other words, each of the protrusions 212b or the multiple protrusions 212c is arranged so that the area that the protrusion occupies per unit area is relatively smaller than the area of ​​the multiple protrusions 212 arranged in the region surrounded by the dashed line 101.

[0088] As a result, a stronger pressure tends to spread in the vertical direction as described above is applied to each of the protrusions 212b or the multiple protrusions 212c compared to each of the multiple protrusions 212 arranged in the area surrounded by the dashed line 101. Therefore, it is necessary to detect whether the protrusion 212b or the multiple protrusions 212c is sufficiently bonded to the metal plate 22 above it with priority over the multiple protrusions 212 arranged in the area surrounded by the dashed line 101.

[0089] Therefore, either the protrusion 212b or the plurality of protrusions 212c is provided with the through hole 2121. This makes it possible to reliably detect the bonding state between the protrusion 212b or the plurality of protrusions 212c and the metal plate 22 thereon by a leak test.

[0090] 10(b), in the metal plate 22, the multiple protrusions 222 include multiple protrusions 222b arranged along the through hole 232 and multiple protrusions 222c arranged along the through hole 242. The outer periphery of each of the multiple protrusions 222b is cut out to fit the inner periphery of the through hole 232, and when viewed from above, each has a planar shape in which a part of a circle is recessed in an arc. The outer periphery of each of the multiple protrusions 222c is cut out to fit the inner periphery of the through hole 242, and when viewed from above, each has a planar shape in which a part of a circle is recessed in an arc.

[0091] In the metal plate 22, a through hole 2221 is formed in one of the multiple protrusions 222c. Also, a through hole 2221 is formed in one of the multiple protrusions 222c. Also, a through hole 2121 is provided in the seal portion 2310 of the metal plate 21 shown in Fig. 10(a) so as to overlap with the through hole 2221 provided in the protrusion 222b in the stacking direction. Also, a through hole 2121 is provided in the seal portion 2410 of the metal plate 21 so as to overlap with the through hole 2221 provided in the protrusion 222c in the stacking direction.

[0092] The area of ​​each of the plurality of protrusions 222b or each of the plurality of protrusions 222c is smaller than the area of ​​each of the plurality of protrusions 222 arranged in the region surrounded by the dashed line 103. In other words, each of the plurality of protrusions 222b or each of the plurality of protrusions 222c is arranged so that the area that the protrusion occupies per unit area is relatively smaller than the area of ​​the plurality of protrusions 212 arranged in the region surrounded by the dashed line 103.

[0093] As a result, a stronger pressure tends to spread in the vertical direction as described above is applied to each of the plurality of protrusions 222b or each of the plurality of protrusions 222c compared to each of the plurality of protrusions 222 arranged in the area surrounded by the dashed line 103. Therefore, it is necessary to detect whether any of the plurality of protrusions 222b or any of the plurality of protrusions 222c is sufficiently bonded to the metal plate 21 above it with priority over the plurality of protrusions 222 arranged in the area surrounded by the dashed line 103.

[0094] Therefore, either one of the plurality of protrusions 222b or either one of the plurality of protrusions 222c is provided with a through hole 2221. This makes it possible to reliably detect the bonding state between either one of the plurality of protrusions 222b or either one of the plurality of protrusions 222c and the metal plate 21 thereon by a leak test.

[0095] In addition, the arrangement of the through holes 31 provided in the metal plate 30 forming the ceiling board 3 is changed according to the metal plate 21 relating to the third modified example and the metal plate 22 relating to the third modified example (Figure 11(a)), and the arrangement of the through holes 41 provided in the metal plate 40 forming the floor board 4 is changed (Figure 11(b)).

[0096] In this embodiment, the protrusion 212b or the protrusion 212c is collectively referred to as the first protrusion. The through hole 251 or the through hole 261 is collectively referred to as the first entrance / exit header. The protrusion 222b or the protrusion 222c is collectively referred to as the second protrusion. The through hole 232 or the through hole 242 is collectively referred to as the second entrance / exit header.

[0097] (Fourth Modification) A pressure jig is used when the multiple metal plates 21 and the multiple metal plates 22 are alternately stacked and diffusion bonded. For example, a stack is formed by alternately stacking the multiple metal plates 21 and the multiple metal plates 22, and the stack is sandwiched between a pair of pressure blocks from above and below, and diffusion bonding is performed while pressing the stack in the vertical direction by the pair of pressure blocks.

[0098] When the laminate is pressed by the pair of pressurizing blocks, it is difficult to maintain a completely parallel state between the pair of pressurizing blocks, and the laminate may be slightly deviated from the parallel state. Therefore, the pressure applied during diffusion bonding may be weaker in the center than in the outer periphery of the laminate. That is, the pressure applied to the protrusions arranged in the center of each of the metal plates 21 and the center of each of the metal plates 22 is weaker than that applied to the protrusions arranged in the outer periphery during diffusion bonding. Therefore, the bonding state between the protrusions arranged in the center and the partition wall above it may be insufficient compared to the bonding state between the protrusions arranged in the outer periphery and the partition wall above it, and it is necessary to preferentially detect whether the protrusions arranged in the center are sufficiently bonded to the partition wall above it.

[0099] Fig. 12(a) and (b) are schematic plan views of a metal plate according to a fourth modified example of a laminated block body. Fig. 12(a) shows one metal plate 21 out of a plurality of metal plates 21. Fig. 12(b) shows one metal plate 22 out of a plurality of metal plates 22. Fig. 13(a) is a schematic plan view of a metal plate according to a fourth modified example of a ceiling plate. Fig. 13(b) is a schematic plan view of a metal plate according to a fourth modified example of a floor plate.

[0100] 12(a), in the metal plate 21, a through hole 2121 is formed in one of a plurality of protrusions 212 arranged in the central part of the metal plate 21 surrounded by the dashed line 109. This makes it possible to reliably detect the bonding state between one of the plurality of protrusions 212 arranged in the central part of the metal plate 21 surrounded by the dashed line 109 and the metal plate 22 thereon by a leak test.

[0101] 12(b), in the metal plate 22, a through hole 2221 is formed in any one of a plurality of protrusions 222 arranged in the central part of the metal plate 22 surrounded by the dashed line 110. This makes it possible to reliably detect the bonding state between any one of the plurality of protrusions 222 arranged in the central part of the metal plate 22 surrounded by the dashed line 110 and the metal plate 21 thereon by a leak test.

[0102] In addition, the arrangement of the through holes 31 provided in the metal plate 30 forming the ceiling panel 3 is changed according to the metal plate 21 relating to the fourth modified example and the metal plate 22 relating to the fourth modified example (Figure 13(a)), and the arrangement of the through holes 41 provided in the metal plate 40 forming the floor panel 4 is changed according to the metal plate 21 relating to the fourth modified example and the metal plate 22 relating to the fourth modified example (Figure 13(b)).

[0103] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made. Each embodiment is not limited to an independent form, and can be combined as far as technically possible. [Explanation of symbols]

[0104] 1...Heat exchanger 1u…Top surface 1d…Bottom surface 1w…Side 2…Stacked block body 3…Ceiling panel 4. Floorboard 21...Metal plate (first metal plate) 22...Metal plate (second metal plate) 23, 24, 25, 26...Header 30, 40...metal plate 31, 41, 231, 232, 241, 242, 251, 252, 261, 262, 331, 341, 351, 361...Through holes 53, 54, 55, 56...Inlet / outlet pipe 60…Aisle 62...Aisle (1st aisle) 63...Aisle (2nd aisle) 64...Aisle (2nd aisle) 100…Poorly bonded area 211...Bulkhead (first partition) 212...Protrusion (1st protrusion) 212a, 212b, 212c...protrusions 213...Outer periphery (first outer periphery) 215...flow path (first flow path) 216...recess (first recess) 221…Partition wall (second partition wall) 222...Protrusion (second protrusion) 222a, 222b, 222c...Protrusions 223...Outer periphery (second outer periphery) 225...flow path (second flow path) 226...recess (second recess) 2121...Through hole (first through hole) 2221...Through hole (second through hole) 2310, 2410, 2520, 2620...Sealing part

Claims

1. A heat exchanger including a laminated block body in which a plurality of metal plates are laminated and bonded by diffusion bonding, The laminated block body includes a plurality of first metal plates and a plurality of second metal plates, and the plurality of first metal plates and the plurality of second metal plates are alternately laminated in the laminated block body, Each of the first metal plates is provided with a first partition wall and a plurality of first projections protruding from the first partition wall, Each of the second metal plates is provided with a second partition wall and a plurality of second projections protruding from the second partition wall, Any of the plurality of first projections and any of the plurality of second projections are alternately overlapped in a stacking direction of the laminated block body, In any one of the plurality of first projections and any one of the plurality of second projections, which are alternately stacked in the laminated block body, a first through hole is formed in the first projection penetrating in the stacking direction, and a second through hole is formed in the second projection penetrating in the stacking direction, the first through hole is formed in the first partition wall at a portion where any of the plurality of first projections is provided, and the second through hole is formed in the second partition wall at a portion where any of the plurality of second projections is provided, In the laminated block body, a first passage is formed in which the first through holes and the second through holes are alternately connected in the laminated direction. heat exchanger.

2. 2. The heat exchanger according to claim 1, The laminated block body is sandwiched between a ceiling plate and a floor plate in the lamination direction and joined to the laminated block body by diffusion bonding. At least one of the ceiling plate and the floor plate has a second passage penetrating therethrough in the stacking direction and connected to the first passage. heat exchanger.

3. 3. A heat exchanger according to claim 1 or 2, each of the plurality of first metal plates has a first region in which an area per unit area occupied by the first protrusions is relatively large, and a second region in which an area per unit area occupied by the first protrusions is relatively small, The first through hole is formed in the first protrusion disposed in the second region. heat exchanger.

4. 3. A heat exchanger according to claim 1 or 2, each of the plurality of second metal plates has a third region in which an area per unit area occupied by the second protrusions is relatively large, and a fourth region in which an area per unit area occupied by the second protrusions is relatively small, The second through hole is formed in the second protrusion disposed in the fourth region. heat exchanger.

5. 3. A heat exchanger according to claim 1 or 2, The first metal plate has a first recess in which the first protrusion is disposed, and a first outer periphery surrounding the first recess. heat exchanger.

6. 3. A heat exchanger according to claim 1 or 2, The second metal plate has a second recess in which the second protrusion is disposed, and a second outer circumferential portion surrounding the second recess. heat exchanger.

7. 3. A heat exchanger according to claim 1 or 2, Each of the first metal plates has a first flow passage formed between the first protrusions and a first inlet / outlet header communicating with the first flow passage, The plurality of first protrusions include a first protruding portion disposed along the first inlet / outlet header, and the first through hole is formed in the first protruding portion. heat exchanger.

8. 3. A heat exchanger according to claim 1 or 2, Each of the second metal plates has a second flow passage formed between the second protrusions and a second inlet / outlet header communicating with the second flow passage, The plurality of second protrusions include a second protruding portion disposed along the second inlet / outlet header, and the second through hole is formed in the second protruding portion. heat exchanger.

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