JP2016130625A - Heat exchanger and metal thin plate for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger and a metal thin plate for the heat exchanger capable of allowing fluid to uniformly flow in the metal thin plates.SOLUTION: A heat exchanger 10 includes a plurality of mutually laminated metal thin plates 20A, 20B, 20C and 20D. The metal thin plates 20A, 20B, 20C and 20D include an outer peripheral region 21, a thin region 22 formed in an inside of the outer peripheral region 21 and thinner than the outer peripheral region 21, and a plurality of heat transfer fins 25 respectively projecting from the thin region 22. The heat transfer fins 25 are respectively separated from the outer peripheral region 21 and other heat transfer fins 25 in a plane direction, and a flow passage 26 through which fluid flows is formed in the periphery of the respective heat transfer fins 25. An edge 27 positioned on the thin region 22 side of the outer peripheral region 21 is a waveform shape or a zigzag shape along a shape of the heat transfer fin 25 adjacent to the edge 27.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchanger and a thin metal plate used in such 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 (see Patent Document 1). In such a plate-type heat exchanger, a plurality of thin metal plate plates that are partially thinned by pressing or half-etching are stacked, and the heat exchange fluid faces between the thin metal plate plates. Alternatively, parallel flow paths are 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

  However, in the conventional plate heat exchanger, the outer boundary of the thin region where the fluid flows is a linear boundary line parallel to the outer shape of the plate. For this reason, the location where the heat transfer fin approaches and the location where the heat transfer fin approaches are repeated along the boundary line. In this case, a space larger than that of the other flow paths is generated in the vicinity of the boundary, so that the fluid easily accumulates in the space, and as a result, the fluid may not flow uniformly in the plate. In such a case, for example, it is necessary to increase the supply pressure of the fluid. In addition, there is a problem that the heat exchange efficiency is lowered due to the fluid not flowing uniformly in the plate.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a heat exchanger and a metal thin plate for heat exchanger that can flow a fluid uniformly in the metal thin plate. And

  The present invention is a heat exchanger including at least a pair of sheet metal plates stacked on each other, wherein the pair of sheet metal plates are respectively formed on an outer peripheral region and on the inner side of the outer peripheral region. And a plurality of heat transfer fins provided so as to protrude from the thin region in the thickness direction of the metal thin plate plate, and each heat transfer fin includes the outer peripheral region and other heat transfer fins. The heat transfer fins are disposed apart from each other in the planar direction, and a flow path through which a fluid flows is formed around each heat transfer fin. The corrugated or zigzag shape follows the shape of the heat transfer fin adjacent to the edge, and the pair of metal thin plate plates face each other on which the thin region is formed. A heat exchanger, characterized in that it is arranged to.

  The present invention provides a heat transfer fin adjacent to the edge as a first heat transfer fin, adjacent to the first heat transfer fin and adjacent to the opposite side of the edge with respect to the first heat transfer fin. When the heat fin is a second heat transfer fin, the width of the flow path formed between the edge portion and the first heat transfer fin is such that the first heat transfer fin and the second heat transfer fin It is a heat exchanger characterized by being narrower than the width | variety of the said flow path formed between.

  The present invention is the heat exchanger, wherein the heat transfer fin has a planar S shape, a planar circular shape, a planar oval shape, or a planar polygonal shape.

  The present invention is the heat exchanger characterized in that the plurality of heat transfer fins are arranged in a staggered manner.

  The present invention is a heat exchanger including at least a pair of sheet metal plates stacked on each other, wherein the pair of sheet metal plates are respectively formed on an outer peripheral region and on the inner side of the outer peripheral region. And a plurality of heat transfer fins provided so as to protrude from the thin region in the thickness direction of the metal thin plate plate, and each heat transfer fin includes the outer peripheral region and other heat transfer fins. The heat transfer fins are disposed apart from each other in the planar direction, and a flow path through which a fluid flows is formed around each heat transfer fin, and the heat transfer fin adjacent to the edge of the outer peripheral region is the first. When the heat transfer fin is a second heat transfer fin adjacent to the first heat transfer fin and adjacent to the opposite side of the edge with respect to the first heat transfer fin, the edge and Said The width of the flow path formed between the heat transfer fins is narrower than the width of the flow path formed between the first heat transfer fin and the second heat transfer fin, and the pair of metals The thin plate-like plate is a heat exchanger characterized in that the surfaces on which the thin regions are formed are arranged to face each other.

  The present invention is a pair of metal thin plate plates for a heat exchanger, wherein the pair of metal thin plate plates are respectively formed in an outer peripheral region and an inner side of the outer peripheral region, and are thinner than the outer peripheral region. A plurality of heat transfer fins provided so as to protrude from the thin region in the thickness direction of the thin metal plate plate, and each heat transfer fin is planar from the outer peripheral region and the other heat transfer fins, respectively. A flow path through which fluid flows is formed around each of the heat transfer fins, and an edge located on the thin area side of the outer peripheral area is adjacent to the edge. It has a wave shape or a zigzag shape along the shape of the heat transfer fin, and the pair of metal thin plate-like plates are arranged so that the surfaces on which the thin regions are formed face each other. That is a pair of metal thin plate plate.

  The present invention is a pair of metal thin plate plates for a heat exchanger, wherein the pair of metal thin plate plates are respectively formed in an outer peripheral region and an inner side of the outer peripheral region, and are thinner than the outer peripheral region. A plurality of heat transfer fins provided so as to protrude from the thin region in the thickness direction of the thin metal plate plate, and each heat transfer fin is planar from the outer peripheral region and the other heat transfer fins, respectively. The flow paths through which the fluid flows are formed around each heat transfer fin, and the heat transfer fin adjacent to the edge of the outer peripheral region is defined as the first heat transfer fin. When the heat transfer fin adjacent to the first heat transfer fin and adjacent to the opposite side of the edge with respect to the first heat transfer fin is a second heat transfer fin, the edge and the first heat transfer fin Formed between The width of the flow path is narrower than the width of the flow path formed between the first heat transfer fin and the second heat transfer fin, and the pair of metal thin plate plates is formed by the thin region. It is a pair of metal thin plate-like plates characterized by being arrange | positioned so that the made surfaces may oppose.

  According to the present invention, the edge portion located on the thin region side in the outer peripheral region has a wave shape or a zigzag shape along the shape of the heat transfer fin adjacent to the edge portion. The fluid can flow uniformly.

FIG. 1 is an exploded perspective view showing a heat exchanger according to an embodiment of the present invention. 2A and 2B are plan views showing a thin metal plate plate of a heat exchanger according to an embodiment of the present invention. FIG. 3 is a partially enlarged plan view showing a metal thin plate-like plate (III part enlarged view of FIG. 2). FIG. 4 is a cross-sectional view showing a pair of thin metal plate plates joined to each other (a view corresponding to a cross section taken along line IV-IV in FIG. 3). FIG. 5 is a schematic perspective view showing a pair of thin metal plate plates joined together. FIG. 6 is a cross-sectional view showing a modification of a pair of thin metal plate plates joined together. FIG. 7 is a partially enlarged plan view (a diagram corresponding to FIG. 3) showing a thin metal plate as a modification. FIG. 8 is a partially enlarged plan view showing a modification of the heat transfer fin. FIG. 9 is a partially enlarged plan view (a diagram corresponding to FIG. 3) showing a thin metal plate as a modification. FIG. 10 is a cross-sectional view showing a pair of metal thin plate plates as a modified example (a view corresponding to a cross section taken along line XX in FIG. 9). FIG. 11 is a partially enlarged plan view (a diagram corresponding to FIG. 3) showing a thin metal plate plate as a comparative example.

  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 of (four in FIG. 1) metal thin plate-like plates 20A, 20B, 20C, and 20D that are stacked on each other between the one fixing plate 11 and the other fixing plate 12 are provided.

Among them, a plurality of metal thin plate plates 20A, 20B, 20C, 20D, the first for the fluid _{F 1} metal sheet-like plates 20A, 20B and the second fluid _{F 2} of the sheet metal-like plate 20C, 20D It is made up of. Each metal thin plate-like plate 20A, 20B, 20C, 20D is pressed against the adjacent metal thin plate-like plate 20A, 20B, 20C, 20D at a temperature close to the melting point, so that the metal atoms constituting the plate are brought into contact with each other. They are diffused to each other and firmly bonded to each other (diffusion bonding). One fixing plate 11 and the other fixing plate 12 are connected to each other by connecting means (not shown), whereby the one fixing plate 11 and the metal thin plate-like plate 20A are in close contact with each other, and the other fixing plate 12 and The thin metal plate 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. The first fluid F ₁ flows into the heat exchanger 10 from the inflow pipe 13A by a compressor or pump (not shown), performs heat exchange while circulating in the thin metal plate plates 20A and 20B, and flows out from the outflow pipe 14A. It is like that.

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 thin metal plates 20C and 20D, and flows out from the outflow pipe 14B. It is supposed to be.

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.

Thus, in the heat exchanger 10, the metal thin plate plate 20A, the first fluid _{F 1} passing between 20B, the metal thin plate plate 20C, a second fluid _{F 2} passing between the 20D Heat exchange is performed between the two. The number of the thin metal plates 20A, 20B, 20C, and 20D is four for convenience in FIG. 1, but is not limited thereto, and may be, for example, about 20 to 200.

  In addition, such a heat exchanger 10 can be used for the heat pump unit of a water heater, an air conditioning equipment, a chemical plant etc., for example.

Configuration of Metal Sheet Plate Next, the configuration of the metal sheet plate according to the present embodiment will be described with reference to FIGS. In the following, the configuration of the pair of thin metal plate plates 20A and 20B for the _first fluid F1 will be described, but the pair of thin metal plate plates 20C and 20D for the _second fluid F2 are also described. The configuration is substantially the same.

  As shown in FIGS. 2A and 2B, each of the pair of thin metal plate 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 thin plate-like plates 20A and 20B 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 peripheral area | region 21 is formed cyclically | annularly along the outer periphery whole region of each metal thin plate-shaped plate 20A, 20B. The outer peripheral region 21 is not half-etched and has the same thickness as the entire thickness of the thin metal plate 20A, 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 the metal thin plate-shaped plates 20A and 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 the pair of corners of the thin metal plate plates 20 </ b> A and 20 </ b> B, respectively. 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 of the thin metal plate 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 thin plate plate 20A, the thin region 22 of 20B and so as not to communicate, the other sheet metal shaped plate It communicates with the thin region 22 of 20C and 20D.

  These inlet side openings 23A and 23B and outlet side openings 24A and 24B are formed so as to penetrate the thin metal plate 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 (thickness direction of the thin metal plate 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.

  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 thin metal plate 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 thin metal plate plates 20A and 20B and the fluid, and may be, for example, 0.2 mm to 3.0 mm.

As shown in FIGS. 4 and 5, the pair of thin metal plate plates 20 </ b> A and 20 </ b> B are joined so that the surfaces on which the thin regions 22 are formed are brought into contact with each other. At this time, a space through which the first fluid F ₁ flows is formed by the thin region 22 between the opposing metal thin plate-like plates 20A and 20B. Further, the thin region 22 and the plurality of heat transfer fins 25 of the pair of thin metal plate plates 20A and 20B are formed to be mirror-symmetric with each other. For this reason, when the metal thin plate-like plates 20A and 20B are joined to each other, the thin regions 22 are joined to each other, and the corresponding heat transfer fins 25 are joined to each other (see FIGS. 4 and 5). Thereby, the joining strength of metal thin plate-shaped plate 20A, 20B can be raised. Further, each heat transfer fin 25 has a solid shape without a cavity. Therefore, the heat transfer fins 25 connected to each other function as a support in the space where the first fluid F ₁ flows. The durability and pressure resistance of the heat exchanger 10 can be improved. Compared with the case where a thin region is formed on a single thin metal plate plate, in this embodiment, a pair of thin metal plate plates 20A and 20B can be joined to form flow paths symmetrically. Therefore, the flow of fluid becomes uniform and the heat exchange efficiency can be improved.

In addition, it is not necessary to join so that the heat-transfer fins 25 of the metal thin plate-like plates 20A and 20B completely coincide with each other. For example, as shown in FIG. 6, the heat transfer fins 25 of the thin metal plate plates 20 </ b> A and 20 </ b> B may be joined in a slightly shifted state in a cross-sectional view. In this case, the displacement δ of the heat transfer fin 25 is preferably 10% or less of the width w _A of the heat transfer fin 25. Even in this case, since the portions joined to each other among the heat transfer fins 25 serve as the support columns, the durability and pressure resistance of the heat exchanger 10 can be improved.

By the way, in this Embodiment, as shown to FIG. 2 (a) (b) and FIG. 3, the edge part 27 located in the thin area | region 22 side among the outer peripheral areas 21 is a heat-transfer fin adjacent to the edge part 27. It has a wave shape or a zigzag shape along 25 shapes. 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. .

In the present embodiment, the wave shape along the shape of the heat transfer fin 25 adjacent to the edge 27 is defined as follows. That is, as shown by the phantom line (two-dot chain line) in FIG. 3, each heat transfer fin 25 a adjacent to the edge 27 is moved in parallel in the X direction by a predetermined distance.
And the wave shape of the edge part 27 is comprised from the line | wire which consists of the periphery located in the X direction plus side among the heat-transfer fins 25a which moved this predetermined distance, and the straight line which connects the said periphery. However, the wave shape of the edge portion 27 may be slightly deviated from the above line.

As described above, the edge 27 located on the thin region 22 side in the outer peripheral region 21 is formed into a wave shape or a zigzag shape, so that the first fluid F ₁ is uniformly distributed between the pair of metal thin plate plates 20A and 20B. It begins to flow. The planar shape of the edge 27 may be a shape in which a curved waveform is repeated such as a sine curve, or may be a shape in which a triangular waveform is repeated, such as a triangular wave or a sawtooth wave. Further, the portion of the edge 27 that has a wave shape or a zigzag shape may be at least a part of the edge 27. For example, as shown in FIG. 3, a linear portion 27 a extending along the main flow direction D (Y direction) of the first fluid F ₁ is formed in the region of the edge portion 27 connected to the inlet side opening 23 </ b> A. ing. This prevents the first fluid F ₁ from the inlet-side opening 23A from becoming difficult to flow through the flow path 26 close to the edge 27, and the first fluid F ₁ is prevented from flowing into the pair of thin metal plates 20A and 20B. It can flow more evenly. On the other hand, as shown in the modified example shown in FIG. 7, a wave shape or a zigzag shape may be formed over the entire edge 27 including the region connected to the inlet side opening 23 </ b> A.

Further, in FIG. 3, the heat transfer fin adjacent to the edge 27 is referred to as a first heat transfer fin 25c, adjacent to the first heat transfer fin 25c and on the opposite side of the edge 27 with respect to the first heat transfer fin 25c. Let the heat-transfer fin located be the 2nd heat-transfer fin 25d. The width w ₁ of the edge portion 27 and the first heat transfer passages 26 formed between the fins 25c are flow formed between the first heat transfer fins 25c and the second heat transfer fins 25d It is narrower than the width w _{2 of the} path 26. The width of the flow path 26 is a distance between the heat transfer fins 25 adjacent to each other, and is a distance measured substantially perpendicular to the flow direction of the fluid flowing in the flow path 26. Further, the widths w ₁ and w ₂ of the flow paths 26 are widths measured at the upstream (minus Y direction) side end portions of the heat transfer fins 25. In particular, it is preferable that w ₁ <w ₂ on the most upstream side of the thin metal plate 20A, and it is more preferable that w ₁ / w ₂ = 0.7 to 1.0.

By the width w ₁ and smaller than the width w _2, the channel 26 formed between the first heat transfer fins 25c and the second heat transfer fins 25d, the edge 27 and the first heat transfer fins 25c It can be made wider than the flow path 26 formed between. Accordingly, since no large space in the vicinity of the edge portion 27 occurs, it is possible to prevent the first fluid F ₁ that is easily accumulated in this space. As a result, it is possible to prevent the first fluid F ₁ is the pair metal sheet-like plates 20A, the composed problem not flow uniformly between 20B more reliably.

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.

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

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, 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 thin metal plate plates 20A and 20B, and flows out from the outflow pipe 14A of the heat exchanger 10. Similarly, the second fluid _{F 2,} the metal thin plate 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, 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 thin plate-like plate 20B and the metal thin plate-like plate 20C are joined to each other, the first fluid F ₁ and the second fluid F ₂ are connected via the metal thin plate-like plates 20B and 20C. Heat exchange is efficiently performed between them.

Hereinafter, the first fluid _{F 1} is a metal thin plate 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 of the pair metal sheet-like 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 thin plate plate 20C, is similar to the substantially the operation when flowing between 20D.

As described above, according to the present embodiment, the edge portion 27 located on the thin region 22 side in the outer peripheral region 21 has a wave shape or a zigzag shape along the shape of the heat transfer fin 25 adjacent to the edge portion 27. ing. For this reason, the first fluid F ₁ (second fluid F ₂ ) can be made to flow uniformly between the pair of metal thin plates 20A, 20B (20C, 20D). Thus, since the flow path resistance of the fluid can be reduced, the pressure loss of the fluid can be reduced. Thereby, the load of the compressor and pump which send a fluid into inflow pipe 13A, 13B of the heat exchanger 10 can be reduced. Further, by reducing the pressure loss of the fluid, the heat exchanger 10 can be made compact, and the amount of fluid used can be reduced.

On the other hand, as a comparative example, the edge 27 of the peripheral region 21 is a straight line, and the width w ₁ of the edge portion 27 and the channel 26 formed between the first heat transfer fins 25c, first heat transfer fins 25c If case of wider than the width w ₂ of the formed are channels 26 between the second heat transfer fins 25d (see FIG. 11), partially large space S between the edge 27 and the heat transfer fins 25 Is formed. In this case, the fluid accumulates in the space S, and the fluid may not smoothly flow through the flow path 26 between the edge portion 27 and the heat transfer fin 25.

  Moreover, according to this Embodiment, compared with the case where the edge part 27 is made into the straight line by projecting the convex part 21a of the outer peripheral area | region 21 to the thin area | region 22 side, metal thin plate-shaped plate 20A, 20B ( 20C, 20D) can be increased. Thereby, the joining strength between the pair of metal thin plate-like plates 20A and 20B (20C and 20D) is improved, and the durability of the heat exchanger 10 can be improved. Further, by improving the pressure resistance of the heat exchanger 10, it becomes possible to use a gas having a pressure higher than that of the conventional one as a fluid.

Modification Next, FIGS. 8 to 10, will be described according to this embodiment for each modification of the metal sheet like plate. 8 to 10, the same parts as those of the embodiment shown in FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the embodiment shown in FIG. 1 to FIG. 7, the case where the heat transfer fin 25 has a substantially plane S shape has been described as an example, but the present invention is not limited to this.

  For example, as shown in FIGS. 8A to 8D, the heat transfer fins 25 have a planar circular shape (FIG. 8A), a planar oval shape (elliptical shape) (FIG. 8B), a planar surface. It may be a polygonal (rectangular) shape (FIG. 8C), a planar polygonal (hexagonal) shape (FIG. 8D), or the like. Even in such a case, the edge portion 27 of the outer peripheral region 21 has a wave shape or a zigzag shape along the shape of the heat transfer fin 25 adjacent to the edge portion 27, so that the fluid is formed into a pair of metal thin plate shapes. It can flow uniformly between the plates 20A, 20B (20C, 20D).

9 and 10, the edge 27 of the outer peripheral region 21 is linear, and the width w of the flow path 26 formed between the edge 27 and the first heat transfer fin 25c. ₁ is smaller than the width w ₂ of the first heat transfer fins 25c and passages 26 formed between the second heat transfer fins 25d. Thus, it is possible to prevent a problem that tends first fluid F ₁ is accumulated in the space in the vicinity of the edge 27, the first fluid F ₁ is a pair of metal thin plate plate 20A, uniformly flows between 20B It is possible to more reliably prevent the problem that disappears.

  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-shaped 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 Flow path 27 Edge

Claims (7)

A heat exchanger comprising at least a pair of sheet metal plates laminated together,
Each of the pair of thin metal plate 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 so as to protrude from the thin region in the thickness direction of the metal thin plate 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,
The edge located on the thin-walled area side in the outer peripheral area has a wave shape or a zigzag shape along the shape of the heat transfer fin adjacent to the edge,
The pair of metal thin plate-like plates are arranged such that surfaces on which the thin regions are formed face each other. The heat transfer fin adjacent to the edge is a first heat transfer fin, and the heat transfer fin adjacent to the first heat transfer fin and adjacent to the opposite side of the edge is first. When using 2 heat transfer fins,
The width of the flow path formed between the edge and the first heat transfer fin is larger than the width of the flow path formed between the first heat transfer fin and the second heat transfer fin. The heat exchanger according to claim 1, wherein the heat exchanger is narrow.   The heat exchanger according to claim 1 or 2, wherein the heat transfer fin has a planar S shape, a planar circular shape, a planar oval shape, or a planar polygonal shape.   The heat exchanger according to claim 3, wherein the plurality of heat transfer fins are arranged in a staggered pattern. A heat exchanger comprising at least a pair of sheet metal plates laminated together,
Each of the pair of thin metal plate 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 so as to protrude from the thin region in the thickness direction of the metal thin plate 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,
The heat transfer fin adjacent to the edge of the outer peripheral region is a first heat transfer fin, and is adjacent to the first heat transfer fin and adjacent to the opposite side of the edge with respect to the first heat transfer fin. When the fin is the second heat transfer fin,
The width of the flow path formed between the edge and the first heat transfer fin is larger than the width of the flow path formed between the first heat transfer fin and the second heat transfer fin. Narrow,
The pair of metal thin plate-like plates are arranged such that surfaces on which the thin regions are formed face each other. A pair of thin metal plates for heat exchanger,
Each of the pair of thin metal plate 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 so as to protrude from the thin region in the thickness direction of the metal thin plate 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,
The edge located on the thin-walled area side in the outer peripheral area has a wave shape or a zigzag shape along the shape of the heat transfer fin adjacent to the edge,
The pair of metal thin plate plates are arranged such that surfaces on which the thin regions are formed face each other. A pair of thin metal plates for heat exchanger,
Each of the pair of thin metal plate 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 so as to protrude from the thin region in the thickness direction of the metal thin plate 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,
The heat transfer fin adjacent to the edge of the outer peripheral region is a first heat transfer fin, and is adjacent to the first heat transfer fin and adjacent to the opposite side of the edge with respect to the first heat transfer fin. When the fin is the second heat transfer fin,
The width of the flow path formed between the edge and the first heat transfer fin is larger than the width of the flow path formed between the first heat transfer fin and the second heat transfer fin. Narrow,
The pair of metal thin plate plates are arranged such that surfaces on which the thin regions are formed face each other.

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