JP2017223430A - Metal plate for heat exchanger and heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal plate for heat exchanger and a heat exchanger which, in the case where one fluid leaks inside the heat exchanger, can prevent the leaked one liquid from being mixed with the other fluid by using a simple structure.SOLUTION: A metal plate 20D for heat exchanger includes: an outer peripheral region 21; a thin wall region 22 which is formed inside the outer peripheral region 21, and which is thinner than the outer peripheral region 21; and a heat transfer fin 25 provided so as to protrude in the thickness direction of the metal plate 20D from the thin wall region 22. In the outer peripheral region 21, an inlet side opening 23A is formed in which a first fluid Fflows and which is arranged being separated from the thin wall region 22. Around the inlet side opening 23A, a groove 28 being independent from the inlet side opening 23A and the thin wall region 22 is formed, and one end 28a of the groove 28 is connected to a through-hole 29 formed in the outer peripheral region 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heat exchanger metal plate and a heat exchanger.

  Generally, heat exchangers are widely used for devices that require the use of heat energy or heat removal. Among them, a plate type heat exchanger is known as a typical high performance heat exchanger. In such a plate-type heat exchanger, a plurality of metal plates that are partially thinned by pressing, half-etching, or the like are stacked, and an opposing or parallel flow of heat exchange fluid is performed between the metal plates. A path is formed. Moreover, in a plate type heat exchanger, in order to improve heat transfer efficiency between two heat exchange fluids having different temperatures, a plurality of heat transfer fins are provided in a flow path through which the heat exchange fluid passes to increase the heat transfer area. .

JP 2014-152963 A

  However, especially in a heat exchanger that uses a high-pressure fluid as the heat exchange fluid, the vicinity of the high-pressure fluid inlet flow path (particularly the vicinity of the metal plate farther from the side where the high-pressure fluid piping is connected) of the metal plates is the most. The pressure load is large, and it is easy to cause poor bonding. For this reason, for example, when a joint failure occurs in the vicinity of the inlet flow path of the high-pressure fluid of the metal plate, the high-pressure fluid may leak from between the metal plates.

  On the other hand, conventionally, there has been known a microchannel heat exchanger having a structure in which an intervening layer is provided between two fluid substrates so that one leaked fluid does not enter the flow path for the other fluid. (For example, refer to Patent Document 1). However, in the heat exchanger described in Patent Document 1, since it is necessary to separately provide an intervening layer between two substrates, there is a problem that the number of substrates increases.

  The present invention has been made in consideration of such points, and when one fluid leaks inside the heat exchanger, a simple structure can be used to mix the leaked fluid into the other fluid. It aims at providing the metal plate for heat exchangers and heat exchangers which can be prevented by using.

  The present invention is a metal plate for a heat exchanger, which is formed in an outer peripheral region, an inner side of the outer peripheral region, and is thinner than the outer peripheral region, and protrudes in the thickness direction of the metal plate from the thin region. The outer peripheral region is formed with an opening that is arranged so as to flow in or out of the fluid and spaced from the thin-walled region, and around the opening, the opening and the heat transfer fin. The heat exchanger metal plate is characterized in that a groove independent of the thin region is formed, and one end of the groove is connected to a through hole formed in the outer peripheral region.

  The present invention is the metal plate for a heat exchanger, wherein the through hole is located at a position farther from the other end of the groove when viewed from the opening.

  The present invention is the metal plate for a heat exchanger, wherein the other end of the groove is located between the opening and the thin region.

  The present invention is the metal plate for a heat exchanger, wherein the other end of the groove is located on the lateral side of the metal plate with respect to the opening.

  The present invention is the metal plate for a heat exchanger, wherein the other end of the groove is located on the opposite side of the thin region with respect to the opening.

  The present invention comprises a pair of fixing plates and a plurality of heat exchanger metal plates arranged in a stacked manner between the pair of fixing plates, and is used for at least one of the plurality of heat exchanger metal plates. The metal plate is a heat exchanger characterized by being a metal plate for the heat exchanger.

  The present invention is the heat exchanger characterized in that the metal plate for heat exchanger adjacent to at least one of the pair of fixed plates is the metal plate for heat exchanger.

  In the present invention, through holes are formed in all of the plurality of metal plates for heat exchanger, and the through holes of the plurality of metal plates for heat exchanger are identical to each other in a state where the plurality of metal plates for heat exchanger are stacked. It is a heat exchanger characterized by being in position.

  The present invention is characterized in that a leak detector for detecting a fluid leaking from between the plurality of metal plates for heat exchanger is provided in the vicinity of at least one of the pair of fixed plates. It is a heat exchanger.

  According to the present invention, when one fluid leaks inside the heat exchanger, the leaked one fluid can be prevented from being mixed with the other fluid using a simple structure.

FIG. 1 is an exploded perspective view showing a heat exchanger according to a first embodiment of the present invention. FIGS. 2A and 2B are plan views showing metal plates according to the first embodiment of the present invention, respectively. FIG. 3 is a partially enlarged plan view showing a metal plate according to the first embodiment of the present invention (an enlarged view of a portion III in FIG. 2B). 4 is a cross-sectional view showing a pair of metal plates joined to each other (a view corresponding to a cross section taken along line IV-IV in FIG. 3). FIG. 5 is a partially enlarged plan view showing a metal plate according to the first embodiment of the present invention (an enlarged view of a portion V in FIG. 2B). FIGS. 6A to 6C are partial enlarged plan views showing modifications of grooves formed in the metal plate, respectively. FIG. 7 is a schematic sectional view showing a state in which the heat exchanger according to the first embodiment of the present invention is used. FIG. 8 is an exploded perspective view showing a heat exchanger according to the second embodiment of the present invention. FIG. 9 is a schematic cross-sectional view showing a state where the heat exchanger according to the second embodiment of the present invention is used.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. Note that, in the following drawings, the same portions are denoted by the same reference numerals, and some detailed description may be omitted.

Configuration of the heat exchanger first, the FIG. 1, will be outlined in the heat exchanger according to the present embodiment. FIG. 1 is an exploded perspective view showing a heat exchanger according to the present embodiment.

  As shown in FIG. 1, a heat exchanger (plate type heat exchanger) 10 according to the present embodiment includes one fixing plate 11 and the other fixing plate 12 provided apart from one fixing plate 11. And a plurality (four in FIG. 1) of heat exchanger metal plates (thin metal plate plates) 20A to 20D arranged to be stacked between one fixing plate 11 and the other fixing plate 12. Yes.

Among these, the plurality of metal plates 20A to 20D are composed of metal plates 20A and 20B for the _first fluid F1 and metal plates 20C and 20D for the _second fluid F2. Each metal plate 20A, 20B, 20C, 20D is bonded to the adjacent metal plate 20A, 20B, 20C, 20D at a temperature close to the melting point, thereby diffusing the metal atoms constituting the plate to each other at the contact surface. Are bonded to each other (diffusion bonding). Alternatively, the metal plates 20A, 20B, 20C, and 20D may be joined to each other by a brazing material. One fixing plate 11 and the other fixing plate 12 are connected to each other by a connecting means (not shown), whereby the one fixing plate 11 and the metal plate 20A are in close contact with each other, and the other fixing plate 12 and the metal plate are in close contact with each other. 20D is in close contact with each other.

  One fixed plate 11 and the other fixed plate 12 each have a substantially rectangular plane shape. One of the fixed plates 11 is connected to inflow pipes 13A and 13B and outflow pipes 14A and 14B. On the other hand, the other fixing plate 12 has a flat shape without an opening or the like.

The inflow pipe 13A and the outflow pipe 14A are used for inflow and outflow of the _first fluid F1, respectively. First fluid F ₁ is the compressor or pump (not shown), flows from the inlet pipe 13A to the heat exchanger 10, the metal plate 20A, while circulating within 20B performs heat exchange, so as to flow out from the outflow pipe 14A It has become. Further, the inlet pipe 13B and outlet pipe 14B is one in which the second fluid _{F 2,} each of which inflow and outflow. The second fluid F ₂ flows into the heat exchanger 10 from the inflow pipe 13B by a compressor or pump (not shown), exchanges heat while circulating in the metal plates 20C and 20D, and flows out from the outflow pipe 14B. It has become.

The first fluid F ₁ and the second fluid F ₂ have different temperatures at least when they flow into the inflow pipes 13A and 13B. The first fluid F ₁ and the second fluid F ₂ may be a gas such as carbon dioxide or air, or may be a liquid such as water. As the first fluid F ₁ and the second fluid F ₂ , the same type of fluid may be used, or different types of fluid may be used. In the present embodiment, high-temperature high-pressure refrigerant (R744 (carbon dioxide) and the like) is used as the first fluid F _1, the case where low-temperature low-pressure fluid (water) is used as the second fluid F ₂ Let's take an example.

On the back side of the other of the fixed plate 12 (opposite side of the metal plate 20D), the leak detector 15 for detecting a first leakage fluid F ₁ of high temperature and high pressure is provided. The leak detector 15 detects the first fluid F ₁ leaking from between the metal plates 20C and 20D in the vicinity of the other fixing plate 12 and flowing out from the back surface side of the other fixing plate 12. The leak detector 15 may detect the leak of the first fluid F ₁ based on, for example, changes in electrical resistance, pressure, temperature, etc. from normal times. The leak detector 15 may be in close contact with the metal plates 20 </ b> A to 20 </ b> D and / or the other fixing plate 12, or may be separated from these. Note that additional leak detectors may be provided at other locations. For example, an additional leak detector to a position on the opposite side of the leak detector 15 is provided to the other of the fixing plate 12 may detect the second leakage fluid F ₂ This additional leak detector .

Thus, in the heat exchanger 10, the metal plate 20A, the first fluid _{F 1} passing between 20B, metal plates 20C, with the second fluid _{F 2} passing between 20D, Heat exchange is performed. Note that the number of the metal plates 20A to 20D is four in FIG. 1 for convenience, but is not limited thereto, and may be, for example, about 20 or more and 200 or less. Further, a part of the plurality of metal plates may be configured differently from the metal plates 20A to 20D according to the present embodiment.

  Such a heat exchanger 10 can be used for, for example, a heat pump unit of a water heater, air conditioning equipment, refrigeration equipment, refrigeration equipment, in-vehicle EGR (Exhaust Gas Recirculation) cooler, chemical plant, and the like.

Configuration of Metal Plate Next, the configuration of the metal plate according to the present embodiment will be described with reference to FIGS. In the following, the pair of metal plates 20C and 20D for the _second fluid F ₂ (low temperature and low pressure fluid) will be described.

  As shown in FIGS. 2A and 2B, each of the pair of metal plates 20C and 20D has a substantially rectangular shape in plan, and has a longitudinal direction and a lateral direction. 2A and 2B, the longitudinal direction is parallel to the Y direction, and the short side direction is parallel to the X direction orthogonal to the Y direction.

  Each of the metal plates 20 </ b> C and 20 </ b> D has an outer peripheral region 21 and a thin region (half-etched region) 22 formed inside the outer peripheral region 21. Among these, the outer peripheral area | region 21 is formed in cyclic | annular form along the outer periphery whole region of each metal plate 20C, 20D. The outer peripheral region 21 is not half-etched and has the same thickness as the entire thickness of the metal plates 20C and 20D.

  Moreover, the thin area | region 22 is thinner than the outer peripheral area | region 21, and is formed only in the one surface side of the metal plates 20C and 20D. In this case, the thin region 22 is formed by performing, for example, half etching processing from the one surface side. “Half etching” means that the material to be etched is etched halfway in the thickness direction. The depth of the thin region 22 may be, for example, about 40% to 70% of the thickness of the outer peripheral region 21. Thus, since the thin region 22 of the metal plates 20A to 20D is formed by (half) etching, the heat exchanger 10 can be made compact and highly efficient compared to the case where the fluid flow path is formed by pressing. can do. Thereby, energy efficiency can be improved including reduction of the amount of refrigerant.

In the thin region 22, an inlet side opening 23 </ b> B and an outlet side opening 24 </ b> B are formed near the pair of corners of the metal plates 20 </ b> C and 20 </ b> D, respectively. The inlet side opening 23 </ b> B and the outlet side opening 24 </ b> B are in communication with the thin region 22 while the second fluid F ₂ passes therethrough.

Further, in the outer peripheral region 21, an inlet side opening 23A and an outlet side opening 24A are formed in the vicinity of the other pair of corners of the metal plates 20C and 20D, respectively. The inlet side opening 23A and the outlet side opening 24A allow the _first fluid F1 to pass through. Therefore, the inlet-side opening 23A and the outlet-side opening 24A are arranged away from the thin region 22 without communicating with the thin region 22 of the metal plates 20C and 20D. On the other hand, the inlet side opening 23A and the outlet side opening 24A communicate with the thin region 22 of the metal plates 20A and 20B (see FIG. 1).

  These inlet side openings 23A and 23B and outlet side openings 24A and 24B are formed so as to penetrate the metal plates 20C and 20D. The inlet openings 23A and 23B and the outlet openings 24A and 24B may be formed by etching from both sides simultaneously with the thin area 22 when the thin area 22 is formed by half etching from one side.

A plurality of heat transfer fins 25 are provided in the thin region 22 so as to protrude in the Z direction (thickness direction of the metal plates 20C and 20D). The thickness of the portion where each heat transfer fin 25 is provided is the same as the thickness of the outer peripheral region 21. On the other hand, each heat transfer fin 25 is arranged separately from the outer peripheral region 21 and the other heat transfer fins 25 in the planar direction (X direction and Y direction). For this reason, each heat transfer fin 25 is independently arranged in an island shape, and a flow path 26 through which the second fluid F ₂ passes is formed around each heat transfer fin 25. 1 and 2 (a) and 2 (b), only a part of the heat transfer fins 25 are shown for the sake of convenience, but actually, the heat transfer fins 25 are arranged over substantially the entire thin region 22. Has been.

As shown in FIG. 3, each heat transfer fin 25 has a substantially plane S shape. The heat transfer fins 25 are arranged in large numbers at regular intervals along the second fluid F ₂ in the main flow direction D (Y-direction). Further, the heat transfer fins 25 are disposed in parallel to each other at a predetermined interval in a direction (X direction) perpendicular to the second fluid F ₂ in the main flow direction D (Y-direction). The heat transfer fins 25 are each formed in a streamline shape that does not cause turbulence such as vortices and swirling flow at both ends in the longitudinal direction, and is configured to minimize fluid resistance. Note that the shape of each heat transfer fin 25 may be a planar circular shape, a planar oval shape, or a planar polygonal shape.

  In the present embodiment, the plurality of heat transfer fins 25 are configured by combining a plurality of two types of heat transfer fins 25a and 25b having a shape symmetrical with each other. Of these, the heat transfer fin 25a has a substantially S-shape extending from the X direction minus side and the Y direction minus side toward the X direction plus side and the Y direction plus side. On the other hand, the heat transfer fin 25b has a substantially S shape extending from the X direction plus side and the Y direction minus side toward the X direction minus side and the Y direction plus side. The heat transfer fins 25a and 25b are each arranged in a line along the X direction, and the line of the heat transfer fins 25a and the line of the heat transfer fins 25b are alternately arranged along the Y direction. The plurality of heat transfer fins 25 are arranged so that a large number of these heat transfer fins 25a and 25b are shifted by a predetermined amount in the X direction and the Y direction, and so-called staggered arrangement (delta arrangement). It has become. In the present specification, these two types of heat transfer fins 25a and 25b are collectively referred to as heat transfer fins 25. The width of the heat transfer fin 25 may be appropriately changed depending on the thickness of the material of the metal plates 20C and 20D and the fluid. Specifically, it is good also as 0.3 mm or more and 1.0 mm or less in the widest location among each heat-transfer fin 25, for example.

The second fluid F ₂ passes through the flow path 26 between the pair of heat transfer fins 25 adjacent to each other in the X direction, and then upstream of the other heat transfer fins 25 located on the further downstream side (minus side in the Y direction). It branches at the end of the side (Y direction plus side) and passes through the flow path 26 between this heat transfer fin 25 and a pair of heat transfer fins 25 adjacent to each other in the X direction. Thereafter, the second fluid F ₂ flowing along the heat transfer fins 25 joins at the end portion on the downstream side (minus side in the Y direction) of the heat transfer fins 25. As a result, pressure loss due to vortex formation and swirling flow due to a sharp bend in the flow path 26 can be minimized, and changes in the flow path area, that is, expansion and contraction of the flow path 26 can be suppressed. And pressure loss due to contraction flow can be kept small. The width of the flow path 26 may be appropriately changed depending on the thickness of the material of the metal plates 20C and 20D and the fluid, and may be, for example, 0.2 mm or more and 3.0 mm or less.

As shown in FIGS. 2A and 2B and FIG. 3, the edge portion 27 located on the thin-walled region 22 side in the outer peripheral region 21 has a wave shape along the shape of the heat transfer fin 25 adjacent to the edge portion 27. Or it has a zigzag shape. That is, the edge 27 of the outer peripheral region 21, and the convex portion 21a protruding to the thin region 22 side, and a concave portion 21b that retracts the outer peripheral area 21 side, to the second fluid _{F 2} in the main flow direction D (Y-direction) A plurality are repeatedly formed along. Further, the wave-shaped or zigzag-shaped edge 27 has a shape matching the shape of the substantially S-shaped heat transfer fin 25. That is, the edge portion 27 is curved along the outer shape of each heat transfer fin 25, whereby the flow path 26 between the edge portion 27 and the heat transfer fin 25 has a substantially constant width. .

  Next, the joined metal plates 20C and 20D will be described with reference to FIG. FIG. 4 shows a state in which the metal plates 20C and 20D are joined together.

As shown in FIG. 4, the metal plates 20 </ b> C and 20 </ b> D are arranged so that the surfaces on which the thin regions 22 are formed face each other. Further, the thin region 22 and the plurality of heat transfer fins 25 of the pair of metal plates 20C and 20D are formed so as to be mirror-symmetric with each other. For this reason, when the metal plates 20C and 20D are joined together, the thin regions 22 are joined together, and the corresponding heat transfer fins 25 are joined together. The metal plate 20C, the flow path 26 where the second fluid _{F 2} flows through the thin region 22 between the 20D is formed.

  The height h (distance in the Z direction) of the flow path 26 is preferably set to 0.1 mm or more and 1.0 mm or less, for example. Thus, by suppressing the height h of the flow path 26, the heat exchanger 10 can be made compact and the efficiency of heat exchange can be increased.

FIG. 5 is a partially enlarged plan view of the metal plate 20D. As shown in FIG. 5, a substantially straight groove 28 in plan view is formed around the inlet opening 23A of the metal plate 20D. A through hole 29 is formed in the outer peripheral region 21, and the groove 28 is connected to the through hole 29. The groove 28 allows the first fluid F ₁ (high-temperature and high-pressure refrigerant) to pass through the through-hole 29 in the heat exchanger 10 if the metal plates 20C and 20D are separated from each other at the periphery of the inlet-side opening 23A. together is discharged to the outside, it is used to detect a leak detector 15 (see FIG. 1) a first fluid F ₁ leakage using.

The groove 28 is simultaneously formed by half etching when the thin region 22 is formed by half etching from one side. For this reason, the groove 28 is formed at substantially the same depth as the thin region 22. The groove 28 has a bottom surface, and the cross-sectional shape of the bottom surface is a curved arc shape such as a substantially semicircle or a substantially semi-ellipse. The width of the groove 28 may be, for example, not less than 0.1 mm and not more than 3.0 mm. The depth of the groove 28 may be, for example, 0.05 mm or more and 1.4 mm or less. By setting the width and depth of the groove 28 within this range, the leaked first fluid F ₁ is surely discharged to the outside of the heat exchanger 10, and the leak detector 15 causes the first fluid F ₁ to be discharged. Leakage can be reliably detected.

Further, the through hole 29 is formed by etching from both sides simultaneously when the thin region 22 is formed by half etching from one side. Therefore, the through hole 29 is formed so as to penetrate the outer peripheral region 21 in the thickness direction. Although the planar shape of the through hole 29 is substantially circular, not limited thereto, substantially oval, substantially polygonal, first fluid F ₁ may be any shape that can pass. The width (diameter) of the through hole 29 is larger than the width of the groove 28, and may be, for example, not less than 0.2 mm and not more than 4.0 mm. By setting the width of the through hole 29 within this range, it is possible to prevent the leaked _first fluid F ₁ from flowing out of the heat exchanger 10.

Further, the groove 28 and the through hole 29 are independent from both the entrance-side opening 23A and the thin region 22 and are spaced apart from the entrance-side opening 23A and the thin region 22 in plan view. For this reason, at the normal time (when the first fluid F ₁ is not leaking), the groove 28 and the through hole 29 do not communicate with either the inlet side opening 23A or the thin region 22. On the other hand, if in the case where the metal plate 20C in the periphery of the inlet-side opening 23A, 20D is peeled off each other, the first fluid _{F 1} from the inlet-side opening 23A is, the outer peripheral region 21 through the groove 28 and the through hole 29 It is designed to be discharged outward.

The groove 28 is substantially linear as described above, and has one end 28a and the other end 28b. Of these, one end 28 a is connected to the through hole 29. On the other hand, the other end 28 b of the groove 28 is located between the inlet side opening 23 </ b> A and the thin region 22. In this case, the first fluid F ₁ leaking from the inlet-side opening 23 A flows from the other end 28 b to the one end 28 a of the groove 28 and is discharged from the through hole 29 to the outside of the heat exchanger 10. Further, since the other end 28b of the groove 28 is located in the vicinity of the location where the inlet side opening 23A and the thin region 22 are closest to each other, the first fluid F ₁ is more reliably prevented from flowing into the thin region 22. be able to.

The through hole 29 is formed in the vicinity of the longitudinal edge 21 c of the outer peripheral region 21. Further, the through hole 29 is preferably located at a position farther from the other end 28b of the groove 28 when viewed from the inlet side opening 23A. Thus, if a metal plate 20C, even when the 20D is peeled off from each other, can be caused to flow in a direction away from the first fluid F ₁ to the inlet-side opening 23A. In FIG. 5, the position of the through hole 29 is provided outside the inlet side opening 23 </ b> A and inside the longitudinal edge 21 c of the outer peripheral region 21. Thus, the first fluid F ₁ is prevented from leaking directly to the outside from the longitudinal edge 21 c of the outer peripheral region 21 without passing through the through hole 29. Moreover, since the through-hole 29 is formed in the same position of other metal plates 20A-20D so that it may mention later, it is preferable not to form in the position which overlaps with the thin area | region 22 of other metal plates 20A-20D. .

In the present embodiment, the groove 28 of the metal plate 20D is formed on the same surface as the surface on which the thin region 22 is formed, but is not limited thereto. The metal plate 20D may be formed on the surface on which the thin region 22 is not formed. Moreover, the groove | channel 28 may be further provided in the circumference | surroundings of 23 A of entrance side openings not only of the metal plate 20D but the metal plate 20C (refer the dashed-two dotted line of FIG. 2A). In this case, the groove 28 of the metal plate 20C is provided at a position corresponding to the groove 28 of the metal plate 20D, and when the metal plates 20C and 20D are joined together, both the grooves 28 constitute one integrated groove. You may do it. In this case, to widen the sectional area of the groove, it is possible to increase the first amount of the fluid F ₁ to be discharged from the groove. Further, the groove 28 and the through hole 29 may be further provided around the outlet side opening 24A of the metal plate 20D (see the two-dot chain line in FIG. 2B). In this case, if the metal plate 20C in the periphery of the outlet opening 24A, even when the 20D is peeled off, it is possible to discharge the first fluid F ₁ leaking to the outside of the heat exchanger 10.

Moreover, when the heat exchanger 10 has a plurality of metal plates 20D, the grooves 28 may not be provided in all of the plurality of metal plates 20D. The groove 28 is provided in one or more metal plates 20D including the metal plate 20D adjacent to the other fixed plate 12 among the plurality of metal plates 20D, and may not be provided in the other metal plates 20D. . In general, when the first fluid F ₁ is high, an area most pressure load is large near the inlet-side opening 23A of the metal plate 20D adjacent to the other fixed plate 12 which is most distant from the inlet pipe 13A. For this reason, it is considered that the vicinity of this region is the place where the bonding failure of the metal plate 20D is most likely to occur. Thus, by providing a groove 28 in the metal plate 20D adjacent to the other fixed plate 12, it is possible to effectively discharge the first fluid F ₁ that has leaked.

On the other hand, the through hole 29 is preferably formed not only in the metal plate 20D having the groove 28 but also in the metal plates 20A to 20D not having the groove 28 (see FIG. 1). Further, the through holes 29 of the metal plates 20A to 20D are provided so as to be in the same in-plane position with the metal plates 20A to 20D being laminated. For this reason, the first fluid F ₁ flowing out of the groove 28 sequentially passes through not only the through hole 29 of the metal plate 20D in which the groove 28 is formed but also the through holes 29 of the other metal plates 20A to 20D. It is discharged outside the heat exchanger 10. In particular, the through holes 29 are formed in all of the metal plates 20A to 20D located on the leakage detector 15 side (for example, the other fixed plate 12 side) from at least the metal plate 20D in which the groove 28 is formed. preferable. In addition, when the leak detector 15 is provided on the back surface side of the other fixing plate 12 (opposite side of the metal plate 20D), a through hole 29 is also formed at the same position of the other fixing plate 12 ( (See FIG. 1). In the present embodiment, the through hole 29 is not formed in one fixing plate 11 in order to reliably detect the _first fluid F ₁ by the leak detector 15. However, for example, when the leak detector 15 is further provided on the one fixing plate 11 side, the through hole 29 may be formed in one fixing plate 11.

  Furthermore, the through holes 29 may be formed in all the metal plates 20 </ b> A to 20 </ b> D stacked between the one fixing plate 11 and the other fixing plate 12. In this case, the through hole 29 can also be used as a positioning hole when the metal plates 20A to 20D are stacked. Thereby, it is not necessary to provide separate positioning means for the metal plates 20A to 20D, and the metal plates 20A to 20D can be accurately positioned and joined using the through holes 29. Furthermore, the through holes 29 may be formed in the one fixing plate 11 and the other fixing plate 12 and used as positioning holes for the one fixing plate 11 and the other fixing plate 12.

  Next, various modifications of the groove 28 will be described with reference to FIGS.

  In FIG. 6A, the groove 28 extends substantially parallel to the longitudinal edge 21 c (long side) of the outer peripheral region 21 and linearly. The through hole 29 is provided inside the short side edge 21d (short side) of the outer peripheral region 21 and spaced from the short side edge 21d. One end 28 a of the groove 28 is connected to the through hole 29. The other end 28b of the groove 28 is located on the side of the short side of the metal plate 20D with respect to the inlet side opening 23A and on the outlet side opening 24B side. In general, the metal plate 20C and the metal plate 20D are peeled off concentrically from the entrance-side opening 23A. Therefore, as in the modification shown in FIG. 6A, leakage can be detected even if the groove 28 is provided on the side opposite to the thin region 22 side. The modification shown in FIG. 6A is particularly suitable for a structure that requires a bonding strength between the inlet side opening 23A and the thin area 22 and a structure that has a narrow width between the inlet side opening 23A and the thin area 22. ing.

  In FIG. 6B, the groove 28 extends substantially in parallel and linearly with respect to the short side edge 21 d (short side) of the outer peripheral region 21. The through hole 29 is provided between the inlet side opening 23A and the outlet side opening 24B. One end 28 a of the groove 28 is connected to the through hole 29. The other end 28b of the groove 28 is located on the side of the short side of the metal plate 20D with respect to the inlet side opening 23A and on the outlet side opening 24B side. In general, the metal plate 20C and the metal plate 20D are peeled off concentrically from the entrance-side opening 23A. Therefore, as in the modification shown in FIG. 6B, leakage can be detected even if the groove 28 is provided on the opposite side to the thin region 22 side. The modification shown in FIG. 6B is particularly suitable for a structure that requires a bonding strength between the inlet-side opening 23A and the thin region 22 and a structure that has a narrow width between the inlet-side opening 23A and the thin region 22. ing.

  In FIG. 6C, the groove 28 extends obliquely and linearly with respect to the longitudinal edge 21 c (long side) and the short edge 21 d (short side) of the outer peripheral region 21. The through hole 29 is provided inside the corner portion 21e of the outer peripheral region 21 and spaced from the corner portion 21e. One end 28 a of the groove 28 is connected to the through hole 29. The other end 28b of the groove 28 is located on the opposite side of the thin-walled region 22 with respect to the inlet side opening 23A. In general, the metal plate 20C and the metal plate 20D are peeled off concentrically from the entrance-side opening 23A. Therefore, as in the modification shown in FIG. 6C, leakage can be detected even if the groove 28 is provided on the side opposite to the thin region 22 side. The modification shown in FIG. 6C is particularly suitable for a structure that requires a bonding strength between the inlet-side opening 23A and the thin region 22 and a structure that has a narrow width between the inlet-side opening 23A and the thin region 22. ing.

  In the present embodiment, the metal plates 20C and 20D are preferably made of a metal having good thermal conductivity, such as stainless steel, iron, copper, copper alloy, aluminum, aluminum alloy, titanium, and the like. Further, the thicknesses of the metal plates 20C and 20D may be set to 0.1 mm or more and 2.0 mm or less, respectively.

The configuration of the pair of metal plates 20A and 20B for the _first fluid F1 may be substantially the same as the configuration of the pair of metal plates 20C and 20D for the _second fluid F2. Alternatively, the shape and / or arrangement of the heat transfer fins 25 of the metal plates 20A and 20B may be different from the shape and / or arrangement of the heat transfer fins 25 of the metal plates 20C and 20D. Further, the metal plate 20A, 20B may be provided with a groove 28 similar to the metal plate 20D or may not be provided with the groove 28. Further, as described above, it is preferable that the metal plate 20A, 20B is also provided with a through hole 29 regardless of the presence or absence of the groove 28.

Operation of the present embodiment Next, the operation of the heat exchanger having such a configuration will be described.

First, in the heat exchanger 10 shown in FIG. 1, along with introducing the first fluid _{F 1} to the inlet pipe 13A, introducing a second fluid _{F 2} to the inlet pipe 13B. In this case, the temperature of the _first fluid F _{1 and} the temperature of the second fluid F ₂ are different from each other.

Next, the first fluid F ₁ passes through the flow path 26 formed in the thin region 22 between the metal plates 20A and 20B, and flows out from the outflow pipe 14A of the heat exchanger 10. Similarly, the second fluid _{F 2} is a metal plate 20C, the flow path 26 formed in the thin region 22 between 20D passes, flows out from the outflow pipe 14B of the heat exchanger 10. At the time of flowing out from the outflow pipe 14A, 14B, relatively cool second is a fluid temperature of the fluid F ₂ is increased than when the inflow of relatively high temperature first is a fluid of the fluid F ₁ The temperature is lower than at the inflow. In this case, since the metal plate 20B and the metal plate 20C are bonded to each other, the metal plate 20B, through 20C, the heat exchange efficiency between the first fluid F ₁ and the second fluid F ₂ Done.

In this way, during use of the heat exchanger 10, the first fluid F ₁ of high temperature and pressure flows continuously to the inlet pipe 13A. Fluid _{F 1} of the first is to sequentially pass through the inlet-side opening 23A of each metal plate 20A to 20D, flows into the flow paths 26 formed metal plate 20C, the thin region 22 of 20D. FIG. 7 shows a schematic cross section of the heat exchanger 10 at this time. By thus first fluid F ₁ of the high-temperature high-pressure flows, metal plates 20C, a high load on the inlet-side opening 23A between the 20D applied. If the metal plates 20C and 20D are not sufficiently joined around the entrance opening 23A, the metal plates 20C and 20D may be peeled around the entrance opening 23A (see position P in FIG. 7). In this case, the metal plate 20C, a first fluid F ₁ through the gap formed between the 20D will intrudes. When the metal plate 20C, a first fluid _{F 1} during 20D intrudes, the first fluid _{F 1} which has entered reaches the flow path 26 formed by a metal plate 20C, 20D thin region 22 each other, There is a risk of mixing with the second fluid F ₂ in the flow path 26.

On the other hand, according to the present embodiment, the groove 28 is formed around the inlet side opening 23A of the metal plate 20D, and one end 28a of the groove 28 is connected to the through hole 29. Furthermore, the through-hole 29 is formed in the same position of each metal plate 20A-20D, respectively. Thus, metal plates 20C, even if the first fluid F ₁ during 20D intrudes, the fluid F ₁ of the first is to the outside of the heat exchanger 10 through the groove 28 and the through hole 29 Discharged. Thus, it is possible to prevent a problem in which the first fluid F ₁ and the second fluid F ₂ will be mixed. Furthermore, by detecting the leaked _first fluid F ₁ with the leak detector 15, the leak of the first fluid F ₁ can be found, and the heat exchanger 10 can be repaired or replaced quickly. be able to.

As described above, according to the present embodiment, the groove 28 independent of the inlet side opening 23A and the thin region 22 is formed around the inlet side opening 23A, and one end 28a of the groove 28 is formed in the outer peripheral region 21. Connected to the through-hole 29. This prevents the leaked first fluid F ₁ from mixing with the second fluid F ₂ even when the first fluid F ₁ leaks inside the heat exchanger 10, and The leakage of _one fluid F ₁ can be detected. Further, since the groove 28 is formed around the inlet side opening 23A in the outer peripheral region 21 and is connected to the through hole 29, there is no need to separately provide an intervening layer or the like between the metal plates 20C and 20D. The discharge of the leaked first fluid F ₁ can be realized with a simple structure. Further, since the groove 28 and the through hole 29 are simultaneously formed by (half) etching when forming the thin region 22, a special manufacturing process for forming the groove 28 and the through hole 29 may be required. Absent.

  Furthermore, according to the present embodiment, since the through holes 29 are formed in all of the plurality of metal plates 20A to 20D, the through holes 29 can be used as positioning holes when the metal plates 20A to 20D are stacked. Can be used. Thereby, it is not necessary to provide separate positioning means for the metal plates 20A to 20D, and the metal plates 20A to 20D can be accurately positioned and stacked using the through holes 29.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 8 and 9 are views showing a second embodiment of the present invention. The second embodiment shown in FIGS. 8 and 9 is different in that the heat exchanger 10A is constituted by two types of metal plates 20B and 20D, and the other configuration is the first embodiment described above. The form is substantially the same. 8 and 9, the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 8, a heat exchanger (plate type heat exchanger) 10 </ b> A according to the present embodiment includes one fixing plate 11 and the other fixing plate 12 provided apart from one fixing plate 11. And a plurality (four in FIG. 1) of heat exchanger metal plates (thin metal plate plates) 20B and 20D disposed on each other between the one fixing plate 11 and the other fixing plate 12. Yes.

In the present embodiment, the metal plate 20B and the metal plate 20D are repeatedly arranged in order between the one fixing plate 11 and the other fixing plate 12. The metal plate 20B is a metal plate for the _first fluid F1, and the metal plate 20D is a metal plate for the _second fluid F2. The configuration of each of the metal plates 20B and 20D is substantially the same as the configuration of the metal plates 20B and 20D in the first embodiment.

In the present embodiment, the surface of the metal plate 20B (the surface on which the thin region 22 is formed) is directly joined to the back surface (the surface on which the thin region 22 is not formed) of the metal plate 20D. In this case, the first fluid F ₁ flows flow path 26 is formed by the rear surface of the thin region 22 and the metal plate 20D of the metal plate 20B. Similarly, the surface of the metal plate 20D (the surface on which the thin region 22 is formed) is directly joined to the back surface (the surface on which the thin region 22 is not formed) of the metal plate 20B. In this case, the flow path 26 where the second fluid F ₂ flows through the rear surface of the thin region 22 and a metal plate 20B of the metal plate 20D is formed.

FIG. 9 is a diagram showing a schematic cross section of the heat exchanger 10A in use. As shown in FIG. 9, the high-temperature and high-pressure first fluid F ₁ sequentially passes through the inlet-side openings 23A of the respective metal plates 20B and 20D, and the flow path 26 formed by the thin region 22 of each of the metal plates 20B. Flow into. By the first fluid _{F 1} flows, joined by high load on the inlet-side opening 23A of the metal plate 20D, a metal plate 20B around the inlet-side opening 23A, 20D tends to be peeled off. (See position P in FIG. 9). In this case, the metal plate 20B, the first fluid F ₁ through the gap formed between the 20D can be considered to be entering.

According to the present embodiment, the groove 28 is formed around the inlet side opening 23 </ b> A of the metal plate 20 </ b> D, and the groove 28 is connected to the through hole 29. Furthermore, the through-hole 29 is formed in the same position of each metal plate 20A-20D, respectively. Thus the discharge, metal plate 20B, even if the first fluid F ₁ during 20D intrudes, the fluid F ₁ of the first via the grooves 28 and the through hole 29 to the outside of the heat exchanger 10 Is done. Thus, it is possible to prevent a problem in which the first fluid F ₁ and the second fluid F ₂ will be mixed.

  It is also possible to appropriately combine a plurality of constituent elements disclosed in the embodiment and the modification examples as necessary. Or you may delete a some component from all the components shown by the said embodiment and modification.

10, 10A Heat exchanger 11 One fixed plate 12 Other fixed plate 20A to 20D Metal plate 21 Outer peripheral region 22 Thin region 23A, 23B Inlet side opening 24A, 24B Outlet side opening 25 Heat transfer fin 26 Flow path 27 Edge portion 28 Groove 29 Through hole

Claims (9)

A metal plate for a heat exchanger,
An outer peripheral area; and
Formed on the inner side of the outer peripheral region, and a thinner region than the outer peripheral region, and
A heat transfer fin provided so as to protrude in the thickness direction of the metal plate from the thin region,
In the outer peripheral region, an opening is formed that flows in or out and is spaced apart from the thin region,
A groove independent of the opening and the thin region is formed around the opening, and one end of the groove is connected to a through-hole formed in the outer peripheral region. .   The metal plate for a heat exchanger according to claim 1, wherein the through hole is located at a position farther from the other end of the groove when viewed from the opening.   The metal plate for a heat exchanger according to claim 1 or 2, wherein the other end of the groove is located between the opening and the thin region.   3. The metal plate for a heat exchanger according to claim 1, wherein the other end of the groove is positioned on a lateral side of the metal plate with respect to the opening.   The metal plate for a heat exchanger according to claim 1 or 2, wherein the other end of the groove is located on the opposite side of the thin region with respect to the opening. A plurality of metal plates for a heat exchanger disposed between the pair of fixing plates and the pair of fixing plates,
6. The heat exchanger according to claim 1, wherein at least one of the plurality of heat exchanger metal plates is a heat exchanger metal plate according to claim 1.   The heat exchanger metal plate according to any one of claims 1 to 5, wherein the heat exchanger metal plate adjacent to at least one of the pair of fixed plates is the heat exchanger metal plate according to any one of claims 1 to 5. 6. The heat exchanger according to 6.   Through holes are formed in all of the plurality of metal plates for heat exchanger, and the through holes of the plurality of metal plates for heat exchanger are in the same position in a state where the plurality of metal plates for heat exchanger are stacked. The heat exchanger according to claim 6 or 7, characterized in that.   The leak detector which detects the fluid which leaks from between the said several metal plates for heat exchangers is provided in the vicinity of at least 1 fixed plate among said pair of fixed plates. The heat exchanger according to any one of 8.

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