JP6536205B2 - Sheet brazing material, method of manufacturing heat exchanger and heat exchanger - Google Patents

Description

  The present invention relates to a sheet brazing material, a method of manufacturing a heat exchanger, and a heat exchanger.

  In general, heat exchangers are widely used in devices that require the use of heat energy and heat removal. Among them, a plate type heat exchanger is known as a typical high performance heat exchanger (for example, see Patent Document 1). In such a plate type heat exchanger, a plurality of metal plates partially formed thin by press processing or half etching processing are stacked, and opposing or parallel flows of heat exchange fluid are formed between the metal plates. It is intended to form a path.

  Further, in the plate type heat exchanger, in order to enhance the heat transfer efficiency between two heat exchange fluids having different temperatures, a plurality of heat transfer fins are provided in the flow path through which the heat exchange fluid passes to increase the heat transfer area .

JP, 2006-170549, A Patent No. 3893110

  For example, in patent document 1, when producing a heat exchanger, the metal plate which has a microchannel is produced using an etching, and these metal plates are joined by the diffusion bonding method. However, when the diffusion bonding method is used, when there is a slight difference in the flatness of the metal plate or when the number of laminated metal plates increases, bonding failure is likely to occur and the production efficiency is lowered. There's a problem.

  On the other hand, in Patent Document 2, the plate and the fin are joined by brazing. However, in the case of using the brazing bonding method, there is a problem that when the brazing material having high fluidity is used, the brazing material infiltrates into the fine flow path manufactured by the etching and the flow path is blocked by the brazing material. . On the other hand, even when a low fluidity brazing material is used, there is a possibility that an unreacted brazing material may remain inside the microchannel. As described above, it is extremely difficult to efficiently install the paste-like or powder-like brazing material only at a predetermined position around the flow path.

  The present invention has been made in consideration of such points, and it is possible to prevent sheet-like brazing material capable of preventing a problem in which a flow path is blocked by a molten brazing material when manufacturing a heat exchanger, It is an object of the present invention to provide a heat exchanger manufacturing method and a heat exchanger.

  The present invention is a sheet-like brazing material for joining a pair of metal plates for heat exchangers, each including a plurality of heat transfer fins arranged separately in a planar direction, and a brazing material outer peripheral region, A through region formed inside the brazing material outer peripheral region, and a plurality of covering regions disposed in the penetrating region and arranged at positions covering the entire corresponding heat transfer fins, each covering region Is a sheet-like brazing material which is held in the brazing material outer peripheral region via a bridge.

  The present invention is a sheet-like brazing material characterized in that each coated region is formed larger than the corresponding heat transfer fin.

  The present invention is the sheet-like brazing material, wherein the bridge connects the end of each covering area and the middle part of the covering area adjacent to the covering area.

  The present invention is the sheet-like brazing material, wherein the penetrating region is formed by etching.

  The present invention is a method of manufacturing a heat exchanger, comprising the steps of: preparing at least one pair of heat exchanger metal plates, each including a plurality of heat transfer fins arranged spaced apart in a plane direction; Bonding the metal plates for exchangers to each other through the sheet-like brazing material, the sheet-like brazing material comprising: a brazing material outer peripheral region; a through region formed inside the brazing material outer peripheral region; And a plurality of covering areas respectively disposed in the areas and arranged at positions covering the corresponding entire heat transfer fins, each covering area being held in the brazing material outer peripheral area via a bridge It is a manufacturing method of the heat exchanger characterized by having.

  The present invention is a method of manufacturing a heat exchanger, wherein each coated area is formed larger than the corresponding heat transfer fin.

  The present invention is the method of manufacturing a heat exchanger, wherein the bridge connects an end of each coated area and a middle part of the coated area adjacent to the coated area.

  The present invention is the method of manufacturing a heat exchanger, wherein the penetrating region of the sheet-like brazing material is formed by etching.

  The present invention is a heat exchanger, comprising at least a pair of heat exchangers, each including a plurality of heat transfer fins arranged in a plane direction and having a flow path formed between heat transfer fins adjacent to each other. And a sheet-like brazing material disposed between the pair of heat exchanger metal plates and joining the pair of heat exchanger metal plates to each other, wherein the sheet-like brazing material has a brazing material outer peripheral region A through region formed inside the brazing material outer peripheral region, and a plurality of fin joint regions disposed in the through region and respectively corresponding to the shapes of the respective heat transfer fins, The heat exchanger is characterized in that there is a region not covered by the material constituting the sheet-like brazing material.

  The present invention is the heat exchanger characterized in that the height of the flow path is 0.1 mm to 1.0 mm.

  The present invention is the heat exchanger characterized in that the material of the metal plate for heat exchanger is exposed in an area of 40% to 90% in area as viewed in a plane direction among the flow paths.

  ADVANTAGE OF THE INVENTION According to this invention, when manufacturing a heat exchanger, the malfunction which the flow path is obstruct | occluded by the fuse | melted brazing material can be prevented.

FIG. 1 is an exploded perspective view showing a heat exchanger according to an embodiment of the present invention. 2 (a) and 2 (c) are plan views showing metal plates, and FIG. 2 (b) is a plan view showing a sheet-like brazing material according to an embodiment of the present invention. FIG. 3 is a partial enlarged plan view showing a metal plate (an enlarged view of a portion III in FIG. 2 (a)). FIG. 4 is a partial enlarged plan view showing a sheet-like brazing material (an enlarged view of a portion IV in FIG. 2 (b)). FIG. 5 is a cross-sectional view showing a pair of metal plates joined together (a view corresponding to the V-V line cross-section of FIG. 4). FIG. 6 is a partial enlarged plan view showing a modified example of the sheet-like brazing material (figure corresponding to FIG. 4).

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. In the following drawings, the same reference numerals are given to the same parts, and a part of the detailed description may be omitted.

Configuration of Heat Exchanger First, an outline of a heat exchanger according to the present embodiment will be described with reference to FIG. FIG. 1 is an exploded perspective view showing a heat exchanger according to the present embodiment.

  As shown in FIG. 1, the 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 the one fixing plate 11. A plurality of (four in FIG. 1) heat exchanger metal plates (thin metal plate-like plates) 20A to 20D disposed in a mutually laminated manner between one fixed plate 11 and the other fixed plate 12; There is.

Among the plurality of metal plates 20A to 20D, the metal plates 20A and 20B for the _first fluid F1 and the metal plates 20C and 20D for the _second fluid F2.

  A sheet-like brazing material (pattern-like brazing material) 30A in which a predetermined pattern is formed is disposed between the pair of heat exchanger metal plates 20A and 20B (hereinafter, also referred to as metal plates 20A and 20B). The pair of metal plates 20A and 20B are joined to each other by the sheet-like brazing material 30A. Similarly, a sheet-like brazing material (pattern-like brazing material) 30B in which a predetermined pattern is formed is disposed between a pair of heat exchanger metal plates 20C and 20D (hereinafter also referred to as metal plates 20C and 20D). ing. The pair of metal plates 20C and 20D are joined to each other by the sheet-like brazing material 30B.

  The sheet-like brazing materials 30A and 30B are each formed of a brazing material outer peripheral region 31, a through region 32 formed inside the brazing material outer peripheral region 31, a plurality of covering regions 35 and bridges (junction Part 36). The configuration of the sheet-like brazing material 30A, 30B will be described later.

  In FIG. 1, sheet brazing materials 30A and 30B show a state before bonding, and a covering area 35 and a bridge 36 are disposed in the penetration area 32. On the other hand, in the heat exchanger 10 after completion, the coating region 35 and the bridge 36 are melted except for the portion to be joined to the heat transfer fins 25.

  A sheet-like brazing material (non-pattern-like brazing material) 30C in which a pattern is not formed is disposed between one fixing plate 11 and the metal plate 20A. One fixing plate 11 and the metal plate 20A are joined to each other by the sheet-like brazing material 30C. In addition, a sheet-like brazing material (non-pattern-like brazing material) 30D in which a pattern is not formed is disposed between the pair of metal plates 20B and 20C. The pair of metal plates 20B and 20C are joined to each other by the sheet-like brazing material 30D. Furthermore, a sheet-like brazing material (non-pattern-like brazing material) 30E in which a pattern is not formed is disposed between the other fixing plate 12 and the metal plate 20D. The other fixing plate 12 and the metal plate 20D are joined to each other by the sheet-like brazing material 30E.

  Unlike the sheet-like brazing materials 30A and 30B, the sheet-like brazing materials 30C to 30E do not have the brazing-material outer peripheral region 31, the penetration region 32, the covering region 35, and the bridge 36. That is, the sheet brazing materials 30C to 30E extend over the entire surface without having an opening etc. except that the inlet side openings 33A, 33B and the outlet side openings 34A, 34B through which the fluid passes are formed through. . The sheet-like brazing materials 30C to 30E have substantially the same planar shape.

  As described above, the metal plates 20A to 20D, or the metal plates 20A to 20D, and the fixing plates 11 and 12 are bonded to each other using a brazing material. As a result, even if a slight difference occurs in the flatness of the metal plates 20A to 20D or the number of stacked metal plates 20A to 20D increases, bonding failure of the metal plates 20A to 20D does not occur. , There is no fear that the production efficiency will decline.

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

Inlet pipe 13A and outlet pipe 14A is one in which the first fluid _{F 1,} each of which inflow and outflow. 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 metal plates 20A and 20B, and flows out of the outflow pipe 14A. It has become. Further, the inflow pipe 13B and the outflow pipe 14B are for the inflow and the outflow of the _second fluid F2, respectively. Second fluid F ₂ is such that by the compressor or pump (not shown), flows from the inlet pipe 13B to heat exchanger 10, the metal plate 20C, by performing heat exchange while circulating in 20D, flows out from the outflow pipe 14B It has become.

First fluid _{F 1} and the second fluid _{F 2,} in the time of flowing at least the inlet pipe 13A, the 13B, are different temperature from each other. As the first fluid F ₁ and the second fluid F _2, carbon dioxide may be a gas such as air, it may be a liquid such as water. First fluid F ₁ and the second fluid F ₂ may use the same type of fluid, may use different types of fluids with each other.

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 to be performed. Although the number of metal plates 20A to 20D is four in FIG. 1 for the sake of convenience, it is not limited to this and may be, for example, about 20 to 200.

  Such a heat exchanger 10 can be used, for example, in 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, with reference to FIGS. 2 (a) and 2 (c) and FIG. 3, the configuration of the metal plate joined using the sheet-like brazing material according to the present embodiment will be described. Although the configuration of the pair of metal plates 20A and 20B for the _first fluid F1 will be described below, the configuration of the pair of metal plates 20C and 20D for the _second fluid F2 is substantially the same. It is.

  As shown in FIGS. 2 (a) and 2 (c), the pair of metal plates 20A and 20B have a substantially rectangular planar shape, and have a longitudinal direction and a short direction. In FIGS. 2A and 2C, the longitudinal direction is parallel to the Y direction, and the short direction is parallel to the X direction orthogonal to the Y direction.

  Each of the metal plates 20A and 20B has an outer peripheral area 21 and a thin area (half etching area) 22 formed inside the outer peripheral area 21. The outer peripheral region 21 is formed annularly along the entire outer periphery of each of the metal plates 20A and 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.

  Further, the thin region 22 is thinner than the outer peripheral region 21 and is formed only on one surface side of the metal plates 20A and 20B. In this case, the thin region 22 is formed by performing, for example, half etching from the one surface side. In addition, "half etching" means etching a to-be-etched material halfway to the thickness direction. The depth of the thin region 22 may be, for example, about 40% to 60% of the thickness of the outer circumferential region 21.

An inlet side opening 23A and an outlet side opening 24A are formed near the pair of corner portions of the metal plates 20A and 20B in the thin-walled region 22, respectively. The inlet-side opening 23A, the outlet side opening 24A, together with the first fluid _{F 1} passes, and communicates with the thin region 22.

Further, in the outer peripheral region 21, in the vicinity of the other pair of corner portions of the metal plates 20A and 20B, an inlet side opening 23B and an outlet side opening 24B are formed, 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 It is in communication with the thin area 22.

  The inlet openings 23A, 23B and the outlet openings 24A, 24B are formed to penetrate the metal plates 20A, 20B. The inlet side openings 23A and 23B and the outlet side 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.

In the thin region 22, a plurality of heat transfer fins 25 are provided 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 spaced apart 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 disposed independently in an island shape, and around each heat transfer fin 25, a flow path 26 for the _first fluid F ₁ to pass is formed. 1 and 2 (a) and 2 (c), only a portion of the heat transfer fins 25 is shown for convenience, but in actuality, the heat transfer fins 25 are disposed over substantially the entire thin region 22. It is done.

As shown in FIG. 3, each heat transfer fin 25 has a substantially S-shaped planar shape. A large number of the heat transfer fins 25 are arranged at regular intervals along the main flow direction D (Y direction) of the first fluid F ₁ . 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 into a streamlined shape so that no turbulence such as swirl or swirl occurs in the longitudinal direction, and the heat transfer fins 25 are configured to minimize fluid resistance. The shape of each heat transfer fin 25 may be a plane circular shape, a plane oval shape, or a plane polygon 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 25 a and 25 b having shapes that are line-symmetrical to each other. Among them, the heat transfer fins 25a have a substantially S-shape extending from the X direction minus side and the Y direction minus side to the X direction plus side and the Y direction plus side. On the other hand, the heat transfer fins 25 b have a substantially S-shape extending from the X direction plus side and the Y direction minus side to the X direction minus side and the Y direction plus side. The heat transfer fins 25a and 25b are disposed in a line along the X direction, and the rows of the heat transfer fins 25a and the rows of the heat transfer fins 25b are alternately disposed along the Y direction. The plurality of heat transfer fins 25 are arranged to shift the positions of the pair of heat transfer fins 25a and 25b by a predetermined amount in the X direction and the Y direction by a predetermined amount respectively, and are arranged in a so-called staggered arrangement (delta arrangement). It has become. In the present specification, these two types of heat transfer fins 25 a and 25 b are collectively referred to as heat transfer fins 25. The width of the heat transfer fins 25 may be appropriately changed depending on the thickness and the fluid of the material of the metal plates 20A and 20B. Specifically, for example, 0.3 mm to 1.0 mm may be provided at the widest portion of the heat transfer fins 25.

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 (the Y direction plus side) It branches at the end on the upstream side (the negative side in the Y direction), and passes through the flow path 26 between the heat transfer fins 25 and 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 merge at the downstream end of the heat transfer fins 25 (Y-direction positive side). Thereby, the pressure loss due to the vortex formation and the swirling flow due to the sharp bending in the flow passage 26 can be minimized, and the change in the flow passage area, that is, the expansion and contraction of the flow passage 26 can be suppressed. And pressure loss due to contraction can be kept small. The width of the flow path 26 may be appropriately changed depending on the thickness and the fluid of the material of the metal plates 20A and 20B, and may be 0.2 mm to 3.0 mm, for example.

In the present embodiment, as shown in FIGS. 2A and 2C and FIG. 3, in the outer peripheral area 21, the edge 27 located on the thin region 22 side is the heat transfer fin 25 adjacent to the edge 27. It has a wave shape or a zigzag shape along the 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) It is repeatedly formed along a plurality. In addition, the edge portion 27 having a wave shape or a zigzag shape has a shape in accordance with the shape of the heat transfer fin 25 having a substantially S shape. That is, the edge 27 is curved along the outer shape of each heat transfer fin 25, whereby the flow path 26 between the edge 27 and the heat transfer fin 25 has a substantially constant width. .

Next, the configuration of the sheet-like brazing material according to the present embodiment will be described with reference to FIGS. 2 (b) and 4. FIG. In addition, although the structure of the sheet-like brazing material 30A which joins metal plate 20A, 20B is demonstrated below, the structure is substantially the same also about the sheet-like brazing material 30B which joins metal plate 20C, 20D.

  FIG. 2 (b) shows the sheet-like brazing material 30A in a state before bonding. As shown in FIG. 2B, the sheet-like brazing material 30A has a substantially rectangular planar shape, and the brazing material outer peripheral region 31 and the through region (etching region) 32 formed inside the brazing material outer peripheral region 31 have. Among them, the brazing material outer peripheral region 31 has substantially the same shape as the outer peripheral region 21 of the sheet-like brazing material 30A, and is formed annularly along the entire outer periphery of the sheet-like brazing material 30A. The edge part located in the penetration area | region 32 side among the brazing material outer peripheral area | regions 31 becomes a wave shape or zigzag shape. The brazing material outer peripheral region 31 is not etched and has the same thickness as the entire thickness of the sheet-like brazing material 30A.

  The penetration area | region 32 penetrates the thickness direction of the sheet-like brazing material 30A, and is formed. In this case, the penetration region 32 is formed, for example, by etching from both sides.

In the vicinity of a pair of corner portions of the sheet-like brazing material 30A in the brazing material outer peripheral region 31, an inlet side opening 33B and an outlet side opening 34B are formed, respectively. The inlet-side opening 33B, the outlet opening 34B, together with the second fluid _{F 2} passes, the through region 32 of the sheet-like brazing material 30A and so as not to communicate, while metal plate 20C, 20D of It is in communication with the thin area 22. The inlet side opening 33B and the outlet side opening 34B are formed to penetrate the sheet-like brazing material 30A. The inlet side opening 33B and the outlet side opening 34B may be formed by etching from both sides simultaneously with the penetrating region 32 when the penetrating region 32 is formed by etching.

  A plurality of covering areas 35 are disposed inside the penetration area 32. Each covering area 35 is disposed at a position covering the entire plane of the corresponding heat transfer fin 25. The thickness of each covering area 35 is the same as the thickness of the brazing material outer peripheral area 31. In addition, each of the covering regions 35 is arranged separately from the brazing material outer peripheral region 31 and the other covering regions 35 in the planar direction (X direction and Y direction). The covering region 35 is a part of a region remaining without being etched when the penetrating region 32 is formed by etching from both sides.

  Further, each of the covering regions 35 is held in the brazing material outer peripheral region 31 via the bridge 36 respectively. That is, at least one bridge 36 is connected to each covering area 35, and the bridge 36 is connected to the other covering area 35 and / or the brazing material outer peripheral area 31. As a result, all the coated regions 35 are held in the brazing material outer peripheral region 31 via the bridges 36 so as not to drop out of the brazing material outer peripheral region 31. When the through region 32 is formed by etching from both sides, the bridge 36 is a part of a region which is not etched and remains. In FIGS. 1 and 2B, only a part of the covering area 35 and the bridge 36 are shown for convenience, but in practice, the covering area 35 and the bridge 36 are substantially the entire area of the penetration area 32. It is arranged.

  Next, with reference to FIG. 4, the configuration of the covering area 35 and the bridge 36 will be further described. FIG. 4 is an enlarged view of a portion IV of FIG. 2 (b), and the position of the corresponding heat transfer fin 25 is indicated by an imaginary line (two-dot chain line).

  As shown in FIG. 4, each covering area 35 has a substantially S-shape in plan view along the heat transfer fins 25. In FIG. 4, the region S indicates the outer peripheral edge of the covering region 35. The covering area 35 covers the entire plane of the heat transfer fin 25. In this case, each covering area 35 may be slightly larger than the shape of the corresponding heat transfer fin 25 and may be widely formed laterally by, for example, about 10 μm to 200 μm. As a result, even when a slight positional deviation occurs between the coated region 35 and the heat transfer fins 25 at the time of bonding, the heat transfer fins 25 can be reliably bonded to each other. When the shape of each heat transfer fin 25 is a flat circular shape, a flat oval shape, or a flat polygonal shape, the shape of each covering region 35 is a flat circular shape according to the shape of each heat transfer fin 25, It may be a plane oval shape or a plane polygon shape.

Each coating region 35 is arranged a number at regular intervals along the first fluid F ₁ of the main flow direction D (Y-direction). Further, the coating region 35 is arranged parallel to at regular intervals in a direction (X direction) perpendicular to the first fluid F ₁ of the main flow direction D (Y-direction).

  The bridge 36 has a substantially linear shape in plan view. The bridge 36 connects the end of each covering area 35 and the middle part of the covering area 35 adjacent to the covering area 35 in the X direction. In the present embodiment, each bridge 36 extends in parallel in the X direction. In this case, since the area of the sheet-like brazing material 30 can be widely secured around the ends of the heat transfer fins 25, the ends of the heat transfer fins 25 of the sheet-like brazing materials 30A and 30B are reliably joined. can do.

  Next, with reference to FIG. 5, the metal plates 20A and 20B in a state of being joined by the sheet-like brazing material 30A will be described. FIG. 5 shows a state in which bonding of the metal plates 20A and 20B is completed, which corresponds to the VV cross section of FIG.

As shown in FIG. 5, the metal plates 20A and 20B are disposed such that the surfaces on which the thin regions 22 are formed face each other. The thin regions 22 of the pair of metal plates 20A and 20B and the plurality of heat transfer fins 25 are formed so as to be mirror-symmetrical to each other. Therefore, when the metal plates 20A and 20B are joined to each other, the thin regions 22 coincide with each other so that the corresponding heat transfer fins 25 coincide with each other. Further, a sheet-like brazing material 30A is interposed between the metal plates 20A and 20B, and the metal plates 20A and 20B are joined to each other by the sheet-like brazing material 30A. At this time, a flow path 26 through which the first fluid F ₁ flows is formed by the thin regions 22 of the metal plates 20A and 20B and the penetration regions 32 of the sheet-like brazing material 30A.

  As described above, in the state where the bonding is completed, the sheet-like brazing material 30A is melted and removed except for the outer peripheral region 21 of the metal plates 20A and 20B and the region corresponding to the heat transfer fins 25. That is, the sheet-like brazing material 30A has the brazing material outer peripheral region 31, and a plurality of fin bonding regions 35a disposed in the through region 32 and corresponding to the shapes of the heat transfer fins 25. The fin bonding area 35 a is a portion of the covering area 35 bonded to the heat transfer fin 25.

In this case, the flow path 26 has a region which is not covered by the material constituting the sheet-like brazing material 30A. In the flow path 26, a small amount of residue 38 of the sheet-like brazing material 30A may remain. The residue 38 is formed by melting the portion of the coated region 35 which is not joined to the heat transfer fins 25 or the bridge 36. In addition, the area of 40% to 90% (refer to 40% or more and 90% or less. The same applies to other parts) in the area of the flow path 26 as viewed in the plane direction is not covered with the residue 38 and the metal plate It is preferable that the material of 20A and 20B is exposed. The amount of the sheet-like brazing material 30A residues 38 to total flow path 26 is negligible and, or occluded flow path 26 by the residue 38, there is no risk of affecting the first flow of fluid F ₁ is or cause.

  The metal plate 20A, 20B is preferably a metal having good thermal conductivity, and various types such as stainless steel, iron, copper, copper alloy, aluminum, aluminum alloy, titanium, etc. can be selected. In addition, the thickness of each of the metal plates 20A and 20B may be, for example, 0.1 mm to 2.0 mm. The same applies to the metal plates 20C and 20D described above.

  The sheet-like brazing material 30A can be variously selected, for example, nickel, silver, copper, or an alloy containing any of these. The thickness of the sheet-like brazing material 30A before bonding can be appropriately set, but may be, for example, 0.02 mm to 0.10 mm (meaning 0.02 mm or more and 0.10 mm or less. The same applies to other places). . The same applies to the sheet-like brazing materials 30B to 30E described above.

  In the present embodiment, the height h (the distance in the Z direction) (see FIG. 5) of the flow path 26 is the depth of the thin regions 22 of the metal plates 20A and 20B and the thickness of the sheet-like brazing material 30A after bonding. Is defined by the sum of Specifically, the height h of the flow path 26 is, for example, preferably 0.1 mm to 1.0 mm (0.1 mm to 1.0 mm or less. The same applies to other portions). 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 enhanced.

Method of Manufacturing Heat Exchanger Next, a method of manufacturing the above-described heat exchanger will be described.

  First, the metal plates 20A to 20D described above are manufactured by etching. In this case, flat plate-like plate metal plates corresponding to the metal plates 20A to 20D are prepared, and the thin plate regions 22 are formed by half-etching the plate metal plates. Further, when forming the thin-walled region 22, the inlet-side openings 23A and 23B and the outlet-side openings 24A and 24B are formed by etching the plate metal plate from both sides. At this time, the outer peripheral area 21 and the area corresponding to the heat transfer fins 25 maintain the same thickness as the plate metal plate without being etched.

  In addition, the sheet-like brazing materials 30A and 30B described above are manufactured by etching. In this case, flat metal plates for brazing material corresponding to the sheet-like brazing materials 30A and 30B are prepared, and the metal regions for brazing material are etched from both sides to form the through regions 32 respectively. Further, simultaneously with the formation of the penetration region 32, the inlet side openings 33A, 33B and the outlet side openings 34A, 34B are also formed. On the other hand, the brazing material outer peripheral region 31, the covering region 35 and the bridge 36 are simultaneously formed, and these regions are not etched and maintain the same thickness as the metal material for the brazing material.

  Similarly, the sheet-like brazing materials 30C to 30E described above are manufactured by etching. Only the openings 33A, 33B, 34A, and 34B through which the fluid passes are formed through the sheet brazing materials 30C to 30E by etching.

  Subsequently, as shown in FIG. 1, the metal plates 20A to 20D and the sheet-like brazing materials 30A to 30E are sandwiched between one fixing plate 11 and the other fixing plate 12. In this case, the sheet-like brazing material 30C, the metal plate 20A, the sheet-like brazing material 30A, the metal plate 20B, the sheet-like brazing material 30D, the metal plate 20C, the sheet-like brazing material 30B, and the metal plate in this order from the fixed plate 11 side. 20D, sheet-like brazing material 30E, and the other fixing plate 12 are disposed.

  Positioning holes (not shown) are formed at predetermined positions in advance on one of the fixing plates 11, the metal plates 20A to 20D, the sheet-like brazing materials 30A to 30E, and the other fixing plate 12, respectively. One positioning plate 11, metal plates 20A to 20D, sheet brazing materials 30A to 30E, and the other fixing plate 12 are positioned using the positioning holes, and these are aligned and fixed by resistance welding. It is good.

  Next, one fixing plate 11 thus positioned, the metal plates 20A to 20D, the sheet-like brazing materials 30A to 30E, and the other fixing plate 12 are put into a brazing furnace (not shown). In the brazing furnace, the sheet-like brazing materials 30A to 30E are heated and melted to a temperature of about 900 ° C to 1200 ° C. Thereby, one fixing plate 11, metal plates 20A to 20D and the other fixing plate 12 are respectively joined by sheet-like brazing materials 30A to 30E.

At this time, the metal plates 20A and 20B are joined to each other through the sheet-like brazing material 30A. At this time, the outer peripheral regions 21 of the metal plates 20A and 20B are in close contact with each other and joined together by the brazing material outer peripheral region 31 of the sheet-like brazing material 30A. Further, the heat transfer fins 25 of the metal plates 20A and 20B are firmly adhered and joined together by the covered area 35 (fin joint area 35a) of the sheet-like brazing material 30A. On the other hand, a space (penetration region 32) is formed around the covering region 35. For this reason, there is no possibility that the flow path 26 will be blocked by the brazing material present around the covering area 35. In the sheet-like brazing material 30A, a part of the covered region 35 (a part located outside the heat transfer fins 25) and the bridge 36 are melted, whereby a small amount of residue 38 of the sheet-like brazing material 30A flows Remain in 26. However, as described above, the amount of the residue 38 in the flow passage 26 is very small, and there is no possibility that the flow passage 26 is blocked by the residue 38 or the flow of the first fluid F ₁ is affected. . The metal plates 20C and 20D are similarly joined to each other through the sheet-like brazing material 30B.

  In this manner, one fixing plate 11, the metal plates 20A to 20D, and the other fixing plate 12 are closely bonded, and the heat exchanger 10 according to the present embodiment is obtained.

Operation of the present embodiment will now be described the action of the heat exchanger having such a configuration.

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 first temperature of the fluid F ₁ and the second temperature of fluid F ₂ are different from each other.

Then, the first fluid _{F 1} is a metal plate 20A, a channel 26 formed in the thin region 22 between 20B passes, 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, 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 To be

As described above, according to the present embodiment, the sheet-like brazing material 30A is provided with the plurality of covering regions 35 arranged in the through region 32 and at positions covering the corresponding entire heat transfer fins 25. There is. Each covered area 35 is held in the brazing material outer peripheral area 31 via the bridge 36. As described above, since the brazing material (covering region 35) can be selectively disposed at the position of the heat transfer fin 25, the passage 26 is blocked by the brazing material remaining inside the flow passage 26, or the unreacted material does not react. There is no possibility that the brazing material of the above will remain in the flow path 26. Thus, the influence to the first flow of fluid F ₁ in the channel 26 that occurs is prevented. As a result, it is possible to efficiently manufacture a plate type heat exchanger with high heat exchange efficiency.

  Further, according to the present embodiment, since the metal plates 20A to 20D are joined using the sheet-like brazing materials 30A to 30E, the flatness of the metal plates 20A to 20D is small unlike the case of using the diffusion bonding method. Even when there is a difference or the number of stacked metal plates 20A to 20D is increased, there is no possibility that a bonding failure will occur. Moreover, unlike the case where the solder material is pattern-formed using a dispenser or masking, there is no unevenness in the thickness of the sheet-like solder materials 30A to 30E, and bonding failure hardly occurs. In addition, since the adhesion by the sheet-like brazing materials 30A to 30E is strong, even if the number of laminated metal plates 20A to 20D is increased, misalignment failure hardly occurs.

  Further, according to the present embodiment, since the flow paths 26 of the metal plates 20A to 20D are manufactured by etching, the heat exchanger 10 can be made compact and highly efficient as compared to the case where the flow paths are manufactured by pressing. It can be done. Thereby, the energy efficiency can be enhanced including the reduction of the amount of refrigerant.

Modified Example Next, a modified example of the sheet-like brazing material will be described with reference to FIG. FIG. 6 is a diagram corresponding to FIG. In FIG. 6, the same parts as those of the embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals and their detailed description will be omitted.

  In the sheet-like brazing material 30F shown in FIG. 6, each of the coated regions 35A is held by the brazing material outer peripheral region 31 via the bridge 36A. In this case, unlike the form shown in FIG. 6, the bridge 36A is formed of a flat, substantially band-shaped bridge that continuously connects the plurality of covering areas 35A. The bridge 36A extends parallel to the X direction. The bridge 36A also has a plurality of circular openings 39 arranged at equal intervals. Each opening 39 is formed between a pair of heat transfer fins 25 adjacent in the X direction. In this case, since the sheet-like brazing material 30F has a large area around the end portions of the heat transfer fins 25, the end portions of the heat transfer fins 25 can be reliably joined.

  It is also possible to appropriately combine a plurality of components disclosed in the above-described embodiment and modifications as necessary. Alternatively, some components may be deleted from all the components shown in the above embodiment and modifications.

DESCRIPTION OF REFERENCE NUMERALS 10 heat exchanger 11 one fixed plate 12 other fixed plate 20A to 20D metal plate 21 outer peripheral area 22 thin area 25 heat transfer fin 26 flow path 27 edge 30A to 30F sheet-like brazing material 31 brazing material outer peripheral area 32 penetrating area 35 coverage area 35a fin junction area 36 bridge 38 residue

Claims (10)

A sheet-like brazing material for joining a pair of metal plates for heat exchangers, each including a plurality of heat transfer fins arranged separately in the planar direction,
Brazing material outer peripheral region,
A through region formed inside the brazing material outer peripheral region;
And a plurality of covering areas arranged in the penetration area and arranged at positions covering the corresponding heat transfer fins, respectively.
A sheet-like brazing material is characterized in that each coated region is held in the brazing material outer peripheral region via a bridge.   The sheet-like brazing material according to claim 1, wherein each coated region is formed to be larger than the corresponding heat transfer fin.   The sheet-like brazing material according to claim 1 or 2, wherein the bridge connects an end of each of the covering regions and an intermediate portion of the covering region adjacent to the covering regions. A method of manufacturing a heat exchanger,
Providing at least one pair of heat exchanger metal plates, each including a plurality of heat transfer fins spaced apart in a planar direction;
Bonding the pair of heat exchanger metal plates to each other through a sheet-like brazing material;
The sheet-like brazing material is
Brazing material outer peripheral region,
A through region formed inside the brazing material outer peripheral region;
And a plurality of covering areas disposed in the penetration area and arranged at positions covering the corresponding entire heat transfer fins,
A method of manufacturing a heat exchanger, wherein each coated area is held on the brazing material outer peripheral area via a bridge. The method for manufacturing a heat exchanger according to claim 4, wherein each coated region is formed larger than the corresponding heat transfer fin. The method for manufacturing a heat exchanger according to claim 4 or 5 , wherein the bridge connects an end portion of each coated region and a middle portion of the coated region adjacent to the coated region. The method for manufacturing a heat exchanger according to any one of claims 4 to 6 , further comprising the step of forming the penetrating region of the sheet-like brazing material by etching. A heat exchanger,
At least one pair of heat exchanger metal plates, each including a plurality of heat transfer fins arranged in a plane direction and having a flow path formed between adjacent heat transfer fins;
A sheet-like brazing material disposed between the pair of heat exchanger metal plates and joining the pair of heat exchanger metal plates to each other;
The sheet-like brazing material is
Brazing material outer peripheral region,
A through region formed inside the brazing material outer peripheral region;
And a plurality of fin junction regions disposed in the penetration region and respectively corresponding to the shapes of the respective heat transfer fins,
A heat exchanger characterized in that a region not covered by the material constituting the sheet-like brazing material is present in the flow path. The heat exchanger according to claim 8, wherein the height of the flow path is 0.1 mm to 1.0 mm. Among the channel, in the region of 40% to 90% by area as viewed from the planar direction, the heat exchanger according to claim 8 or 9 wherein the material of the heat exchanger metal plate and wherein the exposed .

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