JP2017106648A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger having an improved total strength.SOLUTION: A heat exchanger 10 includes a plurality of metal plates 20A, 20B, 20C, 20D stacked on each other. Therein, each of the metal plates 20A, 20B, 20C, 20D includes an outer circumferential region 21, a thin thickness region 22 and a plurality of heat transfer fins 25. A width wof a channel 26 formed between the metal plates 20A, 20B and a width wof the channel 26 formed between the metal plates 20C, 20D are different from each other. At least a part of region of heat transfer fins 28 for support pillars of the metal plates 20A, 20B, 20C, 20D is continuously extended over the whole thickness direction of the metal plates 20A, 20B, 20C, 20D.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heat exchanger including a plurality of metal plates stacked on each other.

  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 (see Patent Document 1). 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 2008-51390 A

  By the way, in the conventional plate-type heat exchanger, for example, when two different types of heat exchange fluids (for example, gas and liquid) are caused to flow inside the heat exchanger, the width of the flow paths for the two heat exchange fluids May be different from each other. However, when the widths of the two flow paths for the heat exchange fluid are different from each other, the heat transfer fins are arranged so as to be shifted in the plane direction. For this reason, the cavity of the thickness direction of a heat exchanger becomes large, and it becomes a problem that the intensity | strength of a heat exchanger falls.

  The present invention has been made in consideration of such points, and an object thereof is to provide a heat exchanger having an increased overall strength.

  The present invention is a heat exchanger including first to fourth metal plates stacked on each other, wherein the first to fourth metal plates are respectively formed in an outer peripheral region and an inner side of the outer peripheral region, A thin region that is thinner than the outer peripheral region, and a plurality of heat transfer fins provided so as to protrude from the thin region in a thickness direction of the metal plate. The heat transfer fins are spaced apart from each other in the plane direction, and a flow path through which a fluid flows is formed around each heat transfer fin, and at least one of the plurality of heat transfer fins is a support column The surface of the first metal plate on which the thin region is formed and the surface of the second metal plate on which the thin region is formed are opposed to each other, and Third The surface of the metal plate on which the thin region is formed and the surface of the fourth metal plate on which the thin region is formed are arranged so as to face each other, and formed between the first and second metal plates. The width of the flow path formed is different from the width of the flow path formed between the third and fourth metal plates, and the heat transfer fins for the columns of the first to fourth metal plates are different from each other. At least a part of the region is a heat exchanger characterized by continuously extending over the entire thickness direction of the first to fourth metal plates.

  The present invention is the heat exchanger characterized in that the support heat transfer fins of the first to fourth metal plates have the same shape.

  According to the present invention, the support heat transfer fins of the first to fourth metal plates are completely overlapped when viewed from the surface direction of the first to fourth metal plates. It is a vessel.

  The present invention is the heat exchanger, wherein the support heat transfer fins of the first to fourth metal plates are provided in a central portion of the first to fourth metal plates.

  According to the present invention, the support heat transfer fins of the first and second metal plates intersect with the support heat transfer fins of the third and fourth metal plates. It is a vessel.

  The present invention is characterized in that the support heat transfer fins of the first and second metal plates are included in the support heat transfer fins of the third and fourth metal plates. It is a vessel.

  According to the present invention, the strength of the entire heat exchanger can be increased.

FIG. 1 is an exploded perspective view showing a heat exchanger according to an embodiment of the present invention. FIGS. 2A and 2B are plan views showing first and second metal plates of a heat exchanger according to an embodiment of the present invention. FIG. 3 is a partially enlarged plan view showing a metal plate (an enlarged view of a portion III in FIG. 2). 4A and 4B are plan views showing third and fourth metal plates of the heat exchanger according to the embodiment of the present invention. FIG. 5 is a schematic perspective view showing first to fourth metal plates joined to each other. FIG. 6 is a schematic cross-sectional view showing first to fourth metal plates joined together. FIG. 7 is a schematic cross-sectional view showing a modification of the first to fourth metal plates joined together. FIG. 8 is a schematic cross-sectional view showing a modification of the first to fourth metal plates joined together. FIG. 9 is a schematic cross-sectional view showing a modification of the first to fourth metal plates joined together.

  Hereinafter, an 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. In addition, a plurality (four in FIG. 1) of thin plate-like metal plates 20A, 20B, 20C, and 20D are provided between the one fixing plate 11 and the other fixing plate 12 so as to be stacked on each other.

Among these, the plurality of metal plates 20A, 20B, 20C and 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 firmly joined 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, a gas is used as the first fluid F _{1 and a} liquid is used as the second fluid F ₂ .

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 metal plates 20A, 20B, 20C, and 20D is four for the sake of convenience in FIG. 1, but is not limited thereto, and may be, for example, about 20 to 200. In the present embodiment, the metal plates 20A, 20B, 20C, and 20D correspond to first to fourth metal plates, respectively.

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

Configuration of Metal Plate Next, the configuration of the metal plate included in the heat exchanger 10 according to the present embodiment will be described with reference to FIGS.

First, the configuration of the pair of metal plates 20A and 20B (first and second metal plates) for the _first fluid F1 will be described with reference to FIGS.

  As shown in FIGS. 2A and 2B, each of the pair of metal plates 20A and 20B has a substantially rectangular plane shape, 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> A and 20 </ b> B includes an outer peripheral region 21 and a thin region (half-etched region) 22 formed inside the outer peripheral region 21. Among these, the outer periphery area | region 21 is formed in cyclic | annular form along the outer periphery whole region of each metal plate 20A, 20B. The outer peripheral region 21 is not half-etched and has the same thickness as the entire thickness of the metal plates 20A and 20B.

  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 metal plate 20A, 20B. 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.

In the thin region 22, an inlet-side opening 23 </ b> A and an outlet-side opening 24 </ b> A are formed in the vicinity of a pair of corners on the diagonal lines of the metal plates 20 </ b> A and 20 </ b> B. The inlet side opening 23 </ b> A and the outlet side opening 24 </ b> A communicate with the thin region 22 while the first fluid F ₁ passes therethrough.

Further, in the outer peripheral region 21, an inlet side opening 23B and an outlet side opening 24B are formed in the vicinity of the other pair of corners on the diagonal lines of the metal plates 20A and 20B, respectively. The inlet-side opening 23B, the outlet opening 24B, together with the second fluid _{F 2} passes through the metal plate 20A, and so does not communicate with the thin region 22 of the 20B, on the other hand, the metal plate 20C, 20D of The thin region 22 is communicated with the thin wall region 22.

  These inlet side openings 23A and 23B and outlet side openings 24A and 24B are formed so as to penetrate the metal plates 20A and 20B. 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 (the thickness direction of the metal plates 20A and 20B). 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 first fluid F ₁ 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 first fluid F ₁ of 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 first fluid F ₁ of 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 20A and 20B and the fluid. Specifically, it is good also as 0.3 mm-1.0 mm in the widest location among each heat-transfer fin 25, for example.

Then, the first fluid F ₁ passes through the flow path 26 between the pair of heat transfer fins 25 adjacent to each other in the X direction, and then the other heat transfer fins 25 located further downstream (Y direction plus side). Of the heat transfer fin 25 and a flow path 26 between a pair of heat transfer fins 25 adjacent to each other in the X direction. Thereafter, the first fluid F ₁ flowing along the heat transfer fins 25 joins at the end portion on the downstream side (Y direction plus side) 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 20A and 20B and the fluid, and may be 0.2 mm to 3.0 mm, for example.

  As shown in FIGS. 2A and 2B, support heat transfer fins 28 are respectively provided in the central portions (X direction central portion and Y direction central portion) of the metal plates 20A and 20B. As will be described later, when the metal plates 20A, 20B, 20C, and 20D are joined to each other, the support heat transfer fins 28 of the metal plates 20A, 20B, 20C, and 20D are in the plane of the metal plates 20A, 20B, 20C, and 20D. They are all in the same position when viewed from the vertical direction (Z direction). For this reason, the support | pillar heat-transfer fin 28 of metal plate 20A, 20B, 20C, 20D is extended continuously over the whole thickness direction of metal plate 20A, 20B, 20C, 20D.

The support heat transfer fins 28 have the same shape as the other heat transfer fins 25. The support heat transfer fins 28 include one (a part) of the plurality of heat transfer fins 25 arranged at a predetermined interval. Thus, by providing the post heat transfer fins 28, first around the first without affecting the flow of the fluid F ₁ is produced, the other heat transfer fins 25 as well as post heat transfer fins 28 1 of the fluid _{F 1} flows. However, the present invention is not limited to this, and the support heat transfer fins 28 may have shapes different from those of the other heat transfer fins 25.

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 region 21 side, the first fluid _{F 1} of 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. .

As shown in FIG. 3, a heat exchange region 22 a in which no heat transfer fins 25 are formed is provided on the side of the inlet side opening 23 </ b> A (on the outlet side opening 24 </ b> B side) in the thin region 22. The heat exchange region 22a, together with the wide to ensure an area for exchanging heat between the first fluid F ₁ and the second fluid F _2, the first fluid F ₁ flowing from the inlet-side opening 23A It plays the role of equalizing the flow of water. The area of the heat exchange region 22a is preferably larger than the inlet side opening 23A.

A portion 23c (a portion on the minus side in the X direction and the minus side in the Y direction) of the peripheral edge of the entrance-side opening 23A is directly connected to the outer peripheral region 21 without the thin region 22 interposed. This prevents the first fluid F ₁ from staying between the inlet-side opening 23A and the outer peripheral region 21 when the flow of the first fluid F ₁ stops, and the first fluid F ₁ Can be prevented from being deposited between the inlet-side opening 23A and the outer peripheral region 21.

  The metal plates 20A and 20B are preferably made of a metal having good thermal conductivity, and various selections such as stainless steel, iron, copper, copper alloy, aluminum, aluminum alloy, titanium, and the like can be made. Moreover, the thickness of each metal plate 20A, 20B is good also as 0.1 mm-2.0 mm, for example.

Next, the configuration of the pair of metal plates 20C and 20D (third and fourth metal plates) for the _second fluid F2 will be described with reference to FIGS. In the following description, the description will mainly focus on the differences from the metal plates 20A and 20B for the _first fluid F1. 4A and 4B, the same parts as those in FIGS. 2A and 2B are denoted by the same reference numerals.

  As shown in FIGS. 4A and 4B, the metal plates 20 </ b> C and 20 </ b> D each include an outer peripheral region 21 and a thin region 22 formed inside the outer peripheral region 21.

In the thin region 22, an inlet side opening 23 </ b> B and an outlet side opening 24 </ b> B are formed in the vicinity of a pair of corners on the diagonal lines of the metal plates 20 </ b> C and 20 </ b> D. 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 another pair of corners on the diagonal lines of the metal plates 20C and 20D, respectively. The inlet-side opening 23A, the outlet side opening 24A, together with the first fluid _{F 1} passes, metal plates 20C, so as not to communicate the thin region 22 of 20D.

  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). 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). In the present embodiment, the shape of each heat transfer fin 25 of the metal plates 20C and 20D is the same as the shape of the heat transfer fin 25 of the metal plates 20A and 20B. Further, similarly to the metal plates 20A and 20B, the heat transfer fins 28 for the columns are respectively provided in the center portions (X direction center portion and Y direction center portion) of the metal plates 20C and 20D. 4A and 4B, only some heat transfer fins 25 are shown for convenience.

In the X direction, the density of the heat transfer fins 25 of the metal plates 20A and 20B is higher than the density of the heat transfer fins 25 of the metal plates 20C and 20D. For this reason, the width w ₂ (the width in the X direction, see FIGS. 4A and 4B) of the flow path 26 formed in the metal plates 20C and 20D is the same as that of the flow path 26 formed in the metal plates 20A and 20B. In this case, the width w ₂ of the flow path 26 of the metal plates 20C and 20D is different from the width w ₁ (width in the X direction, see FIGS. It is wider than the width _{w 1} of 26.

In FIG. 4 (a) (b), the inlet-side second fluid F ₂ which has flowed from the opening 23B flows toward the Y-direction positive side in the Y-direction negative side, a pair of heat transfer fins which are adjacent to each other in the X direction After passing through the flow path 26 between 25, it flows out from the outlet side opening 24B.

  Next, the metal plates 20A, 20B, 20C, and 20D that are joined to each other will be described with reference to FIGS.

As shown in FIGS. 5 and 6, the pair of metal plates 20 </ b> A and 20 </ b> B (20 </ b> C and 20 </ b> D) are joined so that the surfaces on which the thin regions 22 are formed contact each other. At this time, a space through which the first fluid F ₁ (second fluid F ₂ ) flows is formed by the thin region 22 between the opposing metal plates 20A, 20B (20C, 20D). Further, the thin wall region 22 and the plurality of heat transfer fins 25 of the pair of metal plates 20A and 20B (20C and 20D) are formed to be mirror-symmetric with each other. For this reason, when metal plate 20A, 20B (20C, 20D) is mutually joined, it joins so that thin area | region 22 may correspond, and each corresponding heat-transfer fin 25 may correspond. Thereby, the joining strength of metal plate 20A, 20B (20C, 20D) can be raised. Further, the metal plates 20B and 20C are joined so that the surfaces where the thin region 22 is not formed are brought into contact with each other.

  Note that the heat transfer fins 25 of the metal plates 20A and 20B (20C and 20D) may not be joined so as to completely match each other. For example, the heat transfer fins 25 of the metal plates 20 </ b> A and 20 </ b> B (20 </ b> C and 20 </ b> D) may be joined in a slightly shifted state in cross-sectional view.

By the way, in this Embodiment, as shown in FIG.5 and FIG.6, the heat-transfer fin 28 for support | pillars of metal plate 20A, 20B, 20C, 20D is continuously extended over the whole thickness direction (Z direction). . That is, the place where the support heat transfer fins 28 are provided is a place where there is no cavity over the entire thickness direction of the metal plates 20A, 20B, 20C, and 20D (from one fixing plate 11 to the other fixing plate 12). (Refer to the area surrounded by the one-dot chain line in FIG. 6). For this reason, the heat transfer fins 28 for the columns of the metal plates 20A, 20B, 20C, and 20D serve as columns for maintaining the strength, and improve the strength after joining the metal plates 20A, 20B, 20C, and 20D. be able to. In particular, as in the present embodiment, the width w ₁ (see FIGS. 2A and 2B) of the flow path 26 formed in the metal plates 20A and 20B and the flow path formed in the metal plates 20C and 20D. Even if the width w _{2 of} 26 (see FIGS. 4A and 4B) is different from each other, the strength against the force applied in the direction perpendicular to the plane of the metal plates 20A, 20B, 20C, and 20D (Z direction) Can be increased.

  Each of the support heat transfer fins 28 has a solid shape without a cavity. For this reason, since the support | pillar heat-transfer fins 28 mutually connected perform the function as one pillar, compared with the case where each support | pillar heat-transfer fin 28 is hollow shape, of the heat exchanger 10 is. Durability and pressure resistance can be improved. In addition, since each of the support heat transfer fins 28 has a solid shape, the heat exchange efficiency of each support heat transfer fin 28 can be increased.

  5 and FIG. 6, the support heat transfer fins 28 of the metal plates 20A, 20B, 20C, and 20D have the same shape as each other, and the plane direction of the metal plates 20A, 20B, 20C, and 20D (Z It is completely overlapped as seen from the direction. Thereby, the heat exchange efficiency by each heat exchanger fin 28 for pillars can be raised more. Further, the bonding strength between the pair of metal plates 20A, 20B, 20C, and 20D is improved, and the durability of the heat exchanger 10 can be improved.

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

First, in the heat exchanger 10 shown in FIG. 1, the first fluid F ₁ (gas) is introduced into the inflow pipe 13A, and the second fluid F ₂ (liquid) is introduced into the inflow 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 relatively narrow 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 passes through the relatively wide flow path 26 formed in the thin region 22 between the metal plates 20C and 20D, and flows out from the outflow pipe 14B of the heat exchanger 10. At the time of flowing out from the outflow pipe 14A, 14B, one of the temperature of the first fluid F ₁ and the second fluid F ₂ is higher than at the inflow and the other temperature is lowered 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.

Hereinafter, the first fluid _{F 1} is a metal plate 20A, the operation when flowing 20B in the flow path 26 will be described with reference to FIG. 2 (a) (b) and FIG.

First, the first fluid _{F 1} is, flows from the inlet-side opening 23A in the thin region 22. Subsequently, the first fluid F ₁ from the inlet-side opening 23A passes through a flow path 26 between the pair of heat transfer fins 25 which are adjacent to each other, the first fluid F ₁ of the main flow direction D (Y-direction) Along the thin wall region 22. At this time, a part of the first fluid F ₁ flows through the flow path 26 between the edge portion 27 of the outer peripheral region 21 and the heat transfer fin 25.

In the present embodiment, the edge portion 27 located on the thin region 22 side in the outer peripheral region 21 is formed into a wave shape or a zigzag shape along the shape of the heat transfer fin 25. Thus, it is possible to first fluid F ₁ is accumulated in the wide space of near the edge 27, to prevent the flow channel 26 malfunction that hardly flows between the edge 27 and the heat transfer fins 25. As a result, the first fluid _{F 1} the pair of metal plates 20A, it is uniformly flow that between 20B.

Thereafter, the first fluid F _{1 that} has passed through the flow path 26 between the edge portion 27 and the heat transfer fins 25 merges with the first fluid F ₁ that has passed through the flow path 26 between the heat transfer fins 25. And flows out from the outlet side opening 24A.

The second fluid F ₂ is a pair of metal plates 20C, is substantially the same even above and the operation when flowing between 20D.

By the way, it is conceivable that force is applied to the heat exchanger 10 while the heat exchanger 10 is used in this way. Specifically, it is conceivable that force is applied in a direction (Z direction) perpendicular to the plane of the metal plates 20A, 20B, 20C, and 20D. On the other hand, according to the present embodiment, the support heat transfer fins 28 of the metal plates 20A, 20B, 20C, and 20D extend continuously over the entire thickness direction (Z direction). Thereby, each support | pillar heat-transfer fin 28 of metal plate 20A, 20B, 20C, 20D plays the role as a support | pillar, and can improve the durability and pressure | voltage resistance of the heat exchanger 10. FIG. Thereby, the malfunction that metal plate 20A, 20B, 20C, 20D deform | transforms or the flow path 26 is narrowed is prevented. Also, by improving the pressure resistance of the heat exchanger 10, as a fluid F ₂ of the first fluid F ₁ or the second, it also becomes possible to use a higher pressure gas.

On the other hand, as a comparative example, when the metal plate 20A, 20B, 20C, 20D is not provided with such a support heat transfer fin 28, force is exerted in the thickness direction (Z direction) of the metal plates 20A, 20B, 20C, 20D. , The metal plates 20A, 20B, 20C, and 20D are deformed by the cavities existing in the thickness direction (Z direction), and the flow path 26 is narrowed, so that the first fluid F ₁ and the second fluid F There is a possibility that the flow of ₂ is obstructed.

  In addition, according to the present embodiment, the support heat transfer fins 28 of the metal plates 20A, 20B, 20C, and 20D are provided in the central part of the metal plates 20A, 20B, 20C, and 20D. Even if the number of the heat fins 28 is small, the strength of the heat exchanger 10 can be effectively increased.

Modified Examples Next, modified examples of the support heat transfer fins 28 will be described with reference to FIGS. 7 to 9, the same parts as those of the embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the embodiment shown in FIG. 1 to FIG. 6, the case where the support heat transfer fins 28 are respectively provided in the central portions of the metal plates 20 </ b> A, 20 </ b> B, 20 </ b> C, and 20 </ b> D has been described as an example. It is not a thing.

For example, as shown in FIG. 7, the width w ₄ of the flow path 26 formed in the metal plates 20C and 20D is set to be twice the width w ₃ of the flow path 26 formed in the metal plates 20A and 20B. A total of 25 widths may be used. In this case, in the metal plates 20 </ b> A and 20 </ b> B, the support heat transfer fins 28 and every other heat transfer fin 25 (not the support heat transfer fins 28) are arranged. In addition, the heat transfer fins 25 of the metal plates 20C and 20D are all composed of support heat transfer fins 28.

  Further, in the embodiment shown in FIGS. 1 to 6, the support heat transfer fins 28 of the metal plates 20 </ b> A, 20 </ b> B, 20 </ b> C, and 20 </ b> D all have the same shape and are viewed from the plane direction (Z direction). Although the case where they overlap completely has been described as an example, the present invention is not limited to this.

  For example, as shown in FIG. 8, the support heat transfer fins 28 of the metal plates 20 </ b> A, 20 </ b> B, 20 </ b> C, 20 </ b> D have the same shape, and the support heat transfer fins 28 of the support plates of the metal plates 20 </ b> A, 20 </ b> B. And the heat transfer fins 28 for columns of the metal plates 20C and 20D may intersect at the center when viewed from the surface direction (Z direction). In this case, the center part of the support | pillar heat-transfer fin 28 of metal plate 20A, 20B, 20C, 20D is continuously extended over the whole thickness direction of metal plate 20A, 20B, 20C, 20D. According to the configuration shown in FIG. 8, even if the directions of the fluids flowing around the support heat transfer fins 28 are different between the metal plates 20 </ b> A and 20 </ b> B and the metal plates 20 </ b> C and 20 </ b> D, Strength can be increased.

  Alternatively, as shown in FIG. 9, the support heat transfer fins 28 of the metal plates 20A and 20B are smaller than the support heat transfer fins 28 of the metal plates 20C and 20D and viewed from the surface direction (Z direction), The support heat transfer fins 28 of the metal plates 20A and 20B may be included in the support heat transfer fins 28 of the metal plates 20C and 20D. In this case, the entire support heat transfer fins 28 of the metal plates 20A and 20B and the portion of the support heat transfer fins 28 of the metal plates 20C and 20D overlap with the support heat transfer fins 28 of the metal plates 20A and 20B. , Extending continuously over the entire thickness direction. According to the configuration shown in FIG. 9, the strength of the heat exchanger 10 can be increased even when the shape of the support heat transfer fins 28 is different between the metal plates 20A and 20B and the metal plates 20C and 20D. it can.

  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.

DESCRIPTION OF SYMBOLS 10 Heat exchanger 11 One fixed plate 12 The other fixed plate 13A, 13B Inflow pipe 14A, 14B Outflow pipe 14B Outflow pipe 20A-20D Metal plate 21 Outer peripheral area 22 Thin area 23A, 23B Inlet side opening 24A, 24B Outlet side opening 25, 25a to 25d Heat transfer fin 26 Channel 27 Edge

Claims (6)

A heat exchanger including first to fourth metal plates stacked on each other,
Each of the first to fourth metal plates is
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 plurality of heat transfer fins provided to protrude from the thin region in the thickness direction of the metal plate,
Each heat transfer fin is arranged in a plane direction away from the outer peripheral region and other heat transfer fins,
Around each heat transfer fin, a flow path through which fluid flows is formed,
At least one of the plurality of heat transfer fins is a support heat transfer fin.
The surface of the first metal plate on which the thin region is formed and the surface of the second metal plate on which the thin region is formed are arranged to face each other,
The surface of the third metal plate on which the thin region is formed and the surface of the fourth metal plate on which the thin region is formed are arranged to face each other,
The width of the flow path formed between the first and second metal plates is different from the width of the flow path formed between the third and fourth metal plates,
At least a part of the heat transfer fins for the columns of the first to fourth metal plates extends continuously over the entire thickness direction of the first to fourth metal plates. Heat exchanger.   The heat exchanger according to claim 1, wherein the support heat transfer fins of the first to fourth metal plates have the same shape.   3. The heat according to claim 2, wherein the support heat transfer fins of the first to fourth metal plates are completely overlapped when viewed from the surface direction of the first to fourth metal plates. Exchanger.   4. The heat transfer fin for the column of the first to fourth metal plates is provided at a central portion of the first to fourth metal plates. 5. The described heat exchanger.   2. The heat according to claim 1, wherein the support heat transfer fins of the first and second metal plates intersect the support heat transfer fins of the third and fourth metal plates. Exchanger.   2. The heat according to claim 1, wherein the support heat transfer fins of the first and second metal plates are included in the support heat transfer fins of the third and fourth metal plates. Exchanger.

Images