JP7353164B2 - Heat exchanger - Google Patents

Description

The present invention relates to a heat exchanger manufactured using a laminate material such as a laminate sheet in which a resin heat-sealing layer is laminated on a metal heat transfer layer.

As electronic devices such as smartphones and personal computers become smaller and more sophisticated, measures to prevent heat generation around the CPU of electronic devices have become important. Some models incorporate water-cooled coolers or heat pipes to reduce the heat load on electronic components such as the CPU. Techniques have been proposed in the past to reduce heat and prevent heat from being trapped inside the housing, thereby avoiding the adverse effects of heat.

Furthermore, battery modules installed in electric vehicles and hybrid vehicles repeatedly charge and discharge, which increases the heat generated by the battery pack. For this reason, techniques have been proposed for battery modules as well, similar to the above-mentioned electronic devices, to incorporate water-cooled coolers and heat pipes to avoid the adverse effects of heat.

Furthermore, countermeasures have been proposed for power modules made of silicon carbide (SiC), etc., such as installing a cooling plate or a heat sink to prevent heat generation.

By the way, electronic devices such as the smartphones and personal computers mentioned above have thin casings, and many electronic components and coolers are built into the limited space within the thin casings, so the coolers themselves are also thin. It will be done.

Conventionally, thin coolers such as heat pipes that are built into small electronic devices have generally been made by machining metals with high heat conductivity, such as aluminum, and then joining multiple metal parts together by brazing or diffusion bonding. (Patent Documents 1 to 3, etc.).

JP 2015-59693 Publication Japanese Patent Application Publication No. 2015-141002 Japanese Patent Application Publication No. 2016-189415

However, in the conventional cooler for small electronic devices mentioned above, each component is manufactured by plastic processing such as casting or forging, or metal processing (machining) such as removal processing such as cutting. Metal processing is troublesome and has strict restrictions, so there is a limit to how thin it can be made, and it is difficult to make it even thinner than it currently is.

In addition, conventional coolers for small electronic devices are difficult to manufacture because they require highly difficult metal processing (metal-to-metal bonding) such as brazing and diffusion bonding to join each component. Not only that, but there were also problems in that production efficiency decreased and costs increased.

Furthermore, because conventional coolers are manufactured using restricted metal processing, their shape and size cannot be easily changed, resulting in a lack of design freedom and versatility. There are also challenges.

This invention was made in view of the above problems, and not only can it be made sufficiently thin, has a high degree of design freedom and is excellent in versatility, but also can be manufactured efficiently and easily, reducing costs. The purpose is to provide a heat exchanger that can

In order to solve the above problems, the present invention includes the following means.

[1] An outer envelope having both vertical edges as front and rear sides and both lateral edges as both sides, an inner fin provided inside the outer envelope and having an uneven portion, and the outer envelope. A heat exchanger comprising an inlet and an outlet for flowing a heat exchange medium into and out of the body,
The outer envelope is made of an outer envelope laminate material in which a resin heat-sealing layer is provided on the inner surface of a metal heat transfer layer,
The inner fin is composed of an inner core laminate material in which a resin heat-sealing layer is provided on both sides of a metal heat transfer layer,
The inlet and the outlet are arranged side by side in the vicinity of the front side of the outer envelope,
A heat exchanger characterized in that the heat exchange medium flowing into the outer envelope from the inlet passes through an inner fin installation portion and flows out from the outlet.

[2] An inflow path and an outflow path are provided between both side portions in the outer envelope and both side edges of the inner fin,
The inner fin is formed in a wavy shape in which concave portions and convex portions are alternately and consecutively provided, and the inner fin is arranged such that its ridge direction and valley direction are along the lateral direction,
2. The heat exchanger according to item 1, wherein the heat exchange medium that flows in from the inlet passes through the inflow path, the inner fin installation portion, and the outflow path, and then flows out from the outlet.

[3] The device according to item 2, wherein gaps are provided between both sides of the outer casing and both edges of the inner fin, and the inflow path and the outflow path are formed by the gaps on both sides. Heat exchanger.

[4] The heat exchanger according to the above item 2 or 3, wherein the inner fin is formed in a rectangular wave shape with a flat bottom surface of a recess and a top surface of a convex portion.

[5] A box-shaped entrance/exit member is provided within the outer envelope corresponding to the inlet and the outlet,
The inlet/outlet member includes an upstream chamber for supplying the heat exchange medium that has flowed in from the inlet to the inflow path, a downstream chamber that allows the heat exchange medium that has been supplied from the outflow path to flow out from the outlet, and a downstream chamber that allows the heat exchange medium to flow out from the outlet. 5. The heat exchanger according to any one of items 2 to 4, further comprising a partition wall for restricting flow from the chamber side to the downstream chamber side.

[6] A gap is provided between the entrance/exit member and the inner fin, and a baffle plate is provided in the gap to restrict the flow of the heat exchange medium from the inflow path side to the outflow path side. Heat exchanger described in.

[7] The inner fin is formed so that its lateral dimension gradually decreases toward the rear, so that the flow passage cross-sections of the inlet and outlet channels gradually increase from the front side toward the rear. 7. The heat exchanger according to any one of items 2 to 6 above, which is formed as follows.

[8] The outer envelope includes a tray member in which a recess for accommodating the inner fin is formed in an intermediate region, and a cover member arranged to close the recess of the tray member. The heat exchanger according to any one of the preceding clauses 1 to 7.

According to the heat exchanger of invention [1], since the inlet and the outlet are arranged side by side at the front end, the external piping connected to the inlet and the outlet can be consolidated at the front end, making pipe connection work etc. efficient. It can be done smoothly. Furthermore, since the external piping is concentrated on the front end side, it is possible to increase the degree of freedom in the arrangement (layout) of heat exchange components such as batteries, and to improve versatility. In addition, since the heat exchanger of the present invention is manufactured by heat-sealing laminate materials, etc., there is no need for troublesome metal processing, and it can be manufactured easily and efficiently, reducing costs. It is possible to achieve a thinner design. Furthermore, in the heat exchanger of the present invention, the shape and size of the laminate material used as the outer envelope and inner fins can be easily changed, so the degree of freedom in design is increased and the versatility can be improved.

According to the heat exchanger of invention [2], the ridge direction and the trough direction, which are the flow path directions, of the inner fin are arranged in the lateral direction, so that the heat exchange medium is spread from one side edge of the inner fin to the other side edge. Since the heat exchange medium is made to flow, there is no need for a structure such as making a U-turn on the heat exchange medium, and the structure can be simplified accordingly.

According to the heat exchanger of invention [3], since the inflow path and the outflow path are formed using the gaps between both sides of the exterior body and both side edges of the inner fin, the inflow and outflow paths are formed. There is no need to separately provide members for forming the passage and the outflow passage, and the structure can be further simplified accordingly.

According to the heat exchanger of invention [4], since the inner fins are formed in a rectangular wave shape, a sufficient contact area of the inner fins with the outer envelope can be secured, and the heat exchange efficiency can be improved. The strength of contact with the outer envelope can be improved, and occurrence of poor contact can be prevented. Further, since the rising walls of the inner fin are arranged parallel to the thickness direction of the outer fin, the inner fin has sufficient pressure resistance against stress that compresses the outer fin in the thickness direction. Therefore, for example, when heat exchangers and heat exchange target members are arranged in multiple layers in an alternating manner, it is possible to prevent careless deformation even in response to compressive stress in the stacking direction, and ensure sufficient heat exchange performance. can be obtained.

According to the heat exchanger of invention [5], the structure of the inlet/outlet portion can be easily formed by simply installing the inlet/outlet member, and the assembly work can be performed efficiently and smoothly.

According to the heat exchanger of invention [6], it is possible to prevent a harmful shortcut in which the heat exchange medium is directly guided from the inlet to the outlet, and the heat exchange medium can be reliably distributed to the inner fin installation part, resulting in high heat exchange. performance can be ensured.

According to the heat exchanger of invention [7], the heat exchange medium can be distributed evenly over the entire area of the inner fin installation part, and the heat exchange performance can be further improved.

According to the heat exchanger of invention [8], the above effects can be obtained even more reliably.

FIG. 1 is a perspective view showing a heat exchanger according to an embodiment of the invention. FIG. 2 is a diagram showing a heat exchanger according to an embodiment, in which FIG. 2(a) is a plan view, FIG. 2(b) is a side sectional view corresponding to the BB line cross section in FIG. is a front cross-sectional view corresponding to the cross-section taken along the line CC in Figure (a). FIG. 3 is an exploded perspective view of the heat exchanger of the embodiment. FIG. 4 is a front sectional view for explaining the outer envelope and inner fins applied to the heat exchanger of the embodiment. FIG. 5 is a front sectional view for explaining the inner fin of the embodiment. FIG. 6 is a schematic plan view for explaining the configuration of a heat exchanger that is a first modification of the present invention. FIG. 7A is a schematic plan view for explaining the configuration of a heat exchanger that is a second modified example of the present invention. FIG. 7B is a schematic plan view for explaining the configuration of a heat exchanger that is a third modification of the present invention. FIG. 7C is a schematic plan view for explaining the configuration of a heat exchanger that is a fourth modification of the present invention. FIG. 8 is a perspective view showing another example of an inner fin applicable to the heat exchanger of the present invention. FIG. 9 is a front sectional view schematically showing the structure of a heat exchanger according to a fifth modification of the present invention. 3 is a cross-sectional view corresponding to the cross-sectional view taken along line CC in FIG. 2. FIG.

1 to 3 are diagrams showing a heat exchanger that is an embodiment of the present invention. In the following description, in order to facilitate understanding of the invention, the left-right direction in FIG. 2(a) is referred to as the "back-and-forth direction (vertical direction)", and the up-down direction in FIG. 2(a) is referred to as the "left-right direction (horizontal direction)". Further, the vertical direction in FIG. 2(b) will be described as the "vertical direction (thickness direction)".

As shown in FIGS. 1 to 3, the heat exchanger of this embodiment is used as a heat transfer panel, a heat transfer tube, etc., and includes an outer envelope 1 as a casing (container) and an inner part of the outer envelope 1. The inner fin (inner core material) 2 is housed in the inner fin (inner core material) 2, and the entrance/exit member 3 is housed in the front end of the outer envelope 1.

The outer package 1 includes a tray member 10 that is rectangular in plan view and a cover member 15 that is rectangular in plan view.

The tray member 10 is constituted by a molded product of the outer envelope laminate material L1, and the entire intermediate region excluding the outer peripheral edge is recessed downward using a cold forming method such as deep drawing or extrusion molding. A concave portion 11 having a rectangular shape in plan view is formed, and a flange portion 12 projecting outward is integrally formed on the outer periphery of the opening edge of the concave portion 11 .

In this embodiment, the front and rear edges of the recessed portion 11 are configured as a front side 11a and a rear side 11b that extend in the horizontal direction, and both side edges in the left and right direction extend in the vertical direction. It is configured as extending side portions 11c, 11c.

Further, the cover member 15 is formed with a pair of entrances and exits 16, 16, which are arranged in the horizontal direction, corresponding to the front side portion 11a of the recessed portion 11 in the tray member 10. Needless to say, in this embodiment, one of the pair of entrances and exits 16 is configured as an entrance, and the other entrance and exit 16 is configured as an exit.

The tray member 10 and the cover member 15 are made of an outer laminate material L1 that is a laminate sheet having flexibility and flexibility.

As shown in FIG. 4, the outer laminate material L1 includes a heat transfer layer 51 made of metal (metal foil) and a heat-fusible resin laminated on one surface (inner surface) of the heat transfer layer 51 via an adhesive. A heat fusion layer 52 made of a film or heat fusion resin sheet, and a heat resistant resin film or heat resistant resin sheet laminated on the other surface (outer surface) of the heat transfer layer 51 via an adhesive. A protective layer 53 is provided. Note that in this embodiment, the term "foil" is used to include films, thin plates, and sheets.

As the heat transfer layer 51 in the outer envelope laminate material L1, copper foil, aluminum foil, stainless steel foil, nickel foil, nickel-plated copper foil, clad metal made of nickel and copper foil, etc. can be suitably used. In this embodiment, the terms "copper," "aluminum," "nickel," and "titanium" are used to include alloys thereof.

The heat transfer layer 51 is also called a heat collecting layer, and preferably has a thickness of 8 μm to 300 μm, more preferably 100 μm or less.

Further, by subjecting the heat transfer layer 51 to a surface treatment such as chemical conversion treatment, the durability of the heat transfer layer 51 can be further improved by preventing corrosion of the heat transfer layer 51 and improving adhesiveness with resin.

For example, the chemical conversion treatment is performed as follows. That is, the surface of the metal foil that has been subjected to the degreasing treatment is coated with an aqueous solution of any one of the following 1) to 3) and then dried to perform the chemical conversion treatment.

1) An aqueous solution of a mixture containing phosphoric acid, chromic acid, and at least one compound selected from the group consisting of metal salts of fluoride and non-metal salts of fluoride.

2) Phosphoric acid, at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins, and at least one compound selected from the group consisting of chromic acid and chromium (III) salts. , an aqueous solution of a mixture containing.

3) Phosphoric acid, at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins, and at least one compound selected from the group consisting of chromic acid and chromium (III) salts. , at least one compound selected from the group consisting of metal salts of fluoride and non-metal salts of fluoride.

The amount of chromium deposited (per one side) in the chemical conversion film is preferably set to 0.1 mg/m ² to 50 mg/m ² , and more preferably 2 mg/m ² to 20 mg/m ² .

As the heat-sealing layer 52, a film or sheet made of polyolefin resin such as polyethylene or polypropylene or modified resin thereof, fluororesin, polyester resin, vinyl chloride resin, etc. can be suitably used. Among these, it is particularly preferable to use a film or sheet made of unstretched polypropylene (CPP) or linear low density polyethylene (LLDPE).

The thermal adhesive layer 52 preferably has a thickness of 20 μm to 5000 μm, more preferably 30 μm to 80 μm.

Further, as the protective layer 53, a film or sheet made of heat-resistant resin such as polyester resin (PET), polyamide resin (ONY), etc. can be suitably used.

Furthermore, it is preferable to use a protective layer 53 having a thickness of 6 μm to 100 μm.

In addition, as the adhesive for bonding between the heat transfer layer 51, the heat sealing layer 52, and the protective layer 53 that constitute the outer envelope laminate material L1, a urethane adhesive or an epoxy adhesive with a thickness of 1 μm to 5 μm is used. , olefin adhesive, etc. can be suitably used.

In this embodiment, a sheet with a three-layer structure is used as the laminate material L1 constituting the outer envelope 1, but the present invention is not limited to this, and in the present invention, a sheet with a structure of four or more layers may be used. You can also do it. For example, a sheet with a structure of four or more layers is used, such as by interposing another layer between the protective layer and the heat transfer layer, or by interposing another layer between the heat transfer layer and the heat-adhesive layer. You may also do this.

The tray member 10 and cover member 15 of the outer packaging body 1 are configured by the outer packaging laminate material L1 having the above configuration. Then, as will be described in detail later, the cover member 15 is attached to the tray member 10 so as to close the opening of the concave portion 11, thereby forming the outer envelope 1.

As shown in FIGS. 1 to 4, the inner fin 2 accommodated in the hollow part (recessed part) 11 of the outer envelope 1 is made of an inner core laminate material L2, which is a laminate sheet having flexibility. ing.

As shown in FIG. 4, the inner core laminate material L2 includes a heat transfer layer 61 made of metal foil, and a heat sealing layer 62 made of a resin film or resin sheet laminated on both sides of the heat transfer layer 61 via an adhesive. , 62.

As the heat transfer layer 61 in the inner core laminate material L2, copper foil, aluminum foil, stainless steel foil, nickel foil, nickel-plated copper foil, clad metal made of nickel and copper foil, etc. can be suitably used.

The heat transfer layer 61 preferably has a thickness of 8 μm to 300 μm, more preferably 100 μm or less.

As the thermal adhesive layer 62, a film or sheet made of polyolefin resin such as polyethylene or polypropylene or a modified resin thereof, fluororesin, polyester resin, vinyl chloride resin, etc. can be suitably used. Among these, it is particularly preferable to use a film or sheet made of unstretched polypropylene (CPP) or linear low density polyethylene (LLDPE).

The heat-sealing layer 62 preferably has a thickness of 20 μm to 5000 μm, more preferably 30 μm to 80 μm.

In addition, as the adhesive for bonding between the heat transfer layer 61 and the heat sealing layer 62 that constitute the inner core laminate material L2, a urethane adhesive having a thickness of 1 μm to 5 μm is used, as in the case of the outer laminate material L1. , epoxy adhesive, olefin adhesive, etc. can be suitably used.

In this embodiment, a sheet with a three-layer structure is used as the laminate material L2 constituting the inner fin 2, but the present invention is not limited to this, and in the present invention, a sheet with a structure of four or more layers may be used. You can also do it. For example, a sheet having a structure of four or more layers may be adopted by interposing another layer between the heat sealing layer and the heat transfer layer.

Further, as a processing method for the inner fin 2, cutting, injection molding, sheet forming (vacuum forming, pressure forming, etc.), corrugating, and embossing can be used. Needless to say, the method of processing the inner fin 2 is not limited.

As shown in FIGS. 2 to 5, the inner fin 2 is formed into a wave shape in which recesses 25 and projections 26 are formed in succession alternately, and the bottom surface (bottom wall) of the recess and the top surface (top wall) of the projection. ) is formed flat, and the rising walls between the adjacent bottom walls of the concave portions and the top walls of the convex portions are vertically formed into a square wave shape (rectangular wave shape), a so-called digital signal waveform. Further, the inner fin 2 is arranged between the center line of one concave portion 25 (one convex portion 26) and the other concave portion 25 (the other convex portion 26) in the adjacent concave portions 25, 25 (or adjacent convex portions 26, 26). The distance from the center line to the center line is defined as a fin pitch Pf, and the distance from the center line of the concave portion 25 to the center line of the convex portion 26 in the adjacent uneven portions 25 and 26 is defined as a half pitch (Pf/2). The fin pitch Pf and the half pitch Pf/2 are arranged at equal pitches. In other words, the width W11 of the bottom wall of the concave portion (width dimension in the left-right direction when viewed from the plane of FIG. 5) is set equal to the dimension of the top wall of the convex portion in the width direction W12.

In this embodiment, the half pitch Pf/2 is preferably set to 1 mm to 5 mm. That is, if the half pitch Pf/2 is too narrow, processing becomes difficult and the pressure loss of the heat exchange medium increases, which is not preferable. On the other hand, if the half pitch Pf/2 is too wide, it becomes easy to deform due to external pressure, which may lead to a decrease in pressure resistance, which is not preferable.

Further, in this embodiment, it is preferable that the fin height Hf of the inner fin 2 is set to 0.1 mm to 50 mm.

Further, the fin thickness Tf is preferably set to 0.5 mm to 2 mm. That is, if the fin thickness Tf is too thin, the strength against external pressure will decrease, and if it is too thick, there is a risk of adversely affecting heat transfer and the flow rate of the heat medium.

In addition, the inner fins 2 are formed such that the fin pitch Pf direction is along the front-rear direction of the outer envelope 1. In other words, the inner fins 2 are formed so that the ridge direction and the valley direction are in the lateral direction of the outer envelope 1. (vertical direction in FIG. 2(a)).

This inner fin 2 is housed in the recessed part 11 of the tray member 10. In this case, the inner fin 2 is accommodated in a region of the concave portion 11 of the tray member 10 excluding the front end, and also at both left and right end edges of the inner fin 2 and both sides 11c of the concave portion 11 of the tray member 10. A gap serving as a pair of left and right inflow and outflow passages 17, 17 is formed between them.

Further, as described above, the inner fins 2 are arranged so that the ridge direction and the trough direction coincide with the left-right direction (lateral direction) of the tray member 10. Thereby, the intermediate flow path 18 as a tunnel portion and a groove portion formed by the ridge portions and trough portions of the inner fin 2 is arranged along the left-right direction (lateral direction) of the recessed portion 11. The intermediate channels 18 are arranged in parallel in the longitudinal direction (front-back direction) of the tray member 10, and the heat exchange medium (thermal medium) passes through each intermediate channel 18 and is evenly distributed while moving the outer envelope 18. It is configured to allow smooth flow from one side 11c to the other side 11c.

Needless to say, in this embodiment, one of the pair of inflow and outflow paths 17 is configured as an inflow path, and the other outflow and inflow path 17 is configured as an outflow path. .

On the other hand, as shown in FIGS. 2 and 3, the entrance/exit member 3 disposed at the front end of the outer envelope 1 is made of a synthetic resin molded product.

As the resin constituting the entrance/exit member 3, it is preferable to use the same type of resin as the resin constituting the heat-sealing layers 52, 62 of the outer envelope 1 and the inner fin 2. Specifically, polyolefin resins such as polyethylene and polypropylene or modified resins thereof, fluorine resins, polyester resins, vinyl chloride resins, etc. can be suitably used.

The entrance/exit member 3 includes a box-shaped mounting box section 31 having an opening 32 on one side, and a pair of pipe sections 33, 33 provided on the upper wall of the mounting box section 31. The pipe portion 33 communicates with the inside of the mounting box portion 31, and is configured such that a heat exchange medium can pass between the insides of the pipe portions 33, 33 and the inside of the mounting box portion 31.

Furthermore, inside the mounting box part 31 of the entrance/exit member 3, a part corresponding to one pipe part 33 and a part corresponding to the other pipe part 33 are separated by a partition wall 35, and a pair of upstream and downstream chambers are separated. 34, 34 are formed. In this embodiment, among the pair of upstream and downstream chambers 34, 34, one upstream and downstream chamber 34 is configured as an upstream chamber, and the other upstream and downstream chamber 34 is configured as a downstream chamber.

The mounting box portion 31 of the entrance/exit member 3 is arranged in front of the inner fin 2 in the recessed portion 11 of the tray member 10. Furthermore, the pipe parts 33, 33 of the mounting member 3 are arranged upward, and the opening 32 of the mounting box part 31 is arranged inside, that is, facing the inner fin 2. In this case, one upstream and downstream chamber 34 in the entrance/exit member 3 is arranged corresponding to one outflow/inflow path (inflow path) 17 via the opening 32, and the other upstream/downstream chamber 34 is arranged through the opening 32. 32, and is arranged corresponding to the other inflow/outflow passage (outflow passage) 17.

In this way, the entrance/exit member 3 is accommodated in the tray member 10, and the cover member 15 is placed on the tray member 10 so as to close the opening. In this case, the upwardly directed pipe portions 33, 33 of the mounting member 3 are inserted into the entrance/exit 16 of the cover member 15.

By heating this temporary heat exchanger assembly, the contacting members are thermally fused and integrated.

First, the overlapped portion of the outer envelope 1 between the flange portion 12 of the tray member 10 and the outer peripheral edge of the cover member 15 is heated while being sandwiched between a pair of upper and lower heating seal molds (outer envelope fusing step). As a result, the heat-sealing layers 52 of the flange portion 12 of the tray member 10 and the outer peripheral edge portion of the cover member 15 are thermally fused (thermally bonded) to each other, and the hollow portion of the outer envelope 1 is made airtight or liquid-tight. to be sealed.

Furthermore, the middle region (lower wall and upper wall) of the outer envelope 1 whose outer peripheral edge portion is thermally welded is heated while being sandwiched between a pair of upper and lower heating plates. As a result, the heat sealing layer 62 at the top and bottom of the inner fin 2 and the heat sealing layer 52 at the bottom wall of the tray member 10 and the intermediate region (upper wall) of the cover member 15 are thermally bonded (heat melted). (Fin fusing process). Furthermore, in this fin fusion step, the outer circumferential surface of the mounting box portion 31 of the entrance/exit member 3 and the corresponding heat fusion layer 52 of the tray member 10 and cover member 15 are joined together by thermal fusion (thermal bonding). to seal it in a liquid-tight or air-tight state.

The thus assembled heat exchanger is arranged such that the pipe portions 33, 33 of the entrance/exit member 3 protrude upward from the upper wall (cover member 15) at both ends of the outer envelope 1.

If the heat-sealed portions between the inner fin 2 and the attachment member 3 and the outer envelope 1 are made of the same type of resin, both can be reliably fixed with sufficient attachment strength.

In this embodiment, by performing the thermal fusion treatment (heat treatment) under reduced pressure, the inner fins 2 are bonded between the tray member 10 and the cover member 15, and between the tray member 10 and the cover member 15, and the inner fins 2 that are in contact with them. and the attachment member 3 can be strongly thermally bonded. Therefore, it is preferable to carry out the heat fusion treatment under reduced pressure.

In this embodiment, the heating temperature (welding temperature) during the thermal fusion treatment is preferably set at 140°C to 250°C, more preferably 160°C to 200°C. Further, the pressure during thermal fusion (welding pressure) is preferably set to 0.1 MPa to 0.5 MPa, more preferably 0.15 MPa to 0.4 MPa. Further, the fusion time (welding time) is preferably set to 2 seconds to 10 seconds, more preferably 3 seconds to 7 seconds.

In addition, in this embodiment, an outer envelope fusing step is performed in which the flange portion 12 of the tray member 10 and the outer peripheral edge of the cover member 15 are thermally fused together, and the inner fin 2, the entrance/exit member 3, and the outer envelope 1 are thermally fused together. Although the fin fusing step and the fin fusing step are performed in separate heat treatments, the present invention is not limited to this, and in the present invention, the outer envelope fusing step and the fin fusing step may be performed in the same heat treatment. good.

Further, in this embodiment, in the fusion process, particularly in the fin fusion process, a heat conductive rubber layer is arranged on the contact surface with the outer envelope 1 of a pair of heating plates that sandwich the lower and upper walls of the outer envelope 1. By doing so, the lower and upper walls of the outer envelope 1 can be reliably brought into contact with the bottom surface of the concave portion and the top surface of the convex portion of the inner fin 2, and the heat fusion process can be performed with high precision.

The heat exchanger having the above configuration is used as a cooler (cooling device) that cools a battery or the like as a member to be cooled (a member to be heat exchanged). That is, one pipe section 33 of the heat exchanger is connected with an inflow pipe for inflowing a cooling liquid (cooling water, antifreeze, etc.) as a heat exchange medium (refrigerant), and the other pipe section 33 is connected with a cooling liquid (cooling water, antifreeze, etc.). An outflow pipe for outflowing the liquid is connected. Further, a battery as a member to be cooled is placed in contact with the lower wall and/or the upper wall of the outer envelope 1 of the heat exchanger. In this state, the cooling liquid is caused to flow from one pipe section 33 into one upstream/downstream chamber (upstream chamber) 34 of the entrance/exit member 3 in the outer envelope 1, and the cooling liquid is caused to flow into one outflow/inflow path (inflow path) 17. to flow into. Furthermore, the coolant introduced into one outflow/inflow passage 17 is passed through an intermediate flow path 18 formed by the inner fins 2, and is caused to flow into the other outflow/inflow passage (outflow path) 17. Further, the water flows from the other inflow/outflow passage 17 into the other upstream/downstream chamber (downstream chamber) 34 of the entrance/exit member 3 through the opening 32 and flows out from there through the other pipe section 33 . By circulating the cooling fluid through the outer envelope 1 in this manner, heat is exchanged between the cooling fluid and the battery via the inner fins 2 and the upper and lower walls of the outer envelope 1, thereby cooling the battery.

Note that in the heat exchanger of this embodiment, when a gap is formed between the entrance and exit member 3 and the inner fin 2 in the outer envelope 1, as shown in FIG. 6, for example, the entrance and exit member 3 The cooling liquid that is about to flow from one upstream/downstream chamber (upstream chamber) 34 into one outflow/inflow path (inflow path) 17 directly flows into the other upstream/downstream chamber (downstream chamber) 34 through the gap. As a result, a so-called shortcut may occur, leading to a decrease in heat exchange performance. Therefore, as shown in the figure, if there is the above-mentioned gap, a baffle plate 36 is formed between the partition wall 35 of the entrance/exit member 3 and the inner fin 2 so as to divide the above-mentioned gap into two. Shortcuts can be prevented, the coolant can be reliably circulated through one of the inflow and outflow paths 17, the intermediate flow path 18, and the other outflow and inflow path 17, and high heat exchange efficiency can be maintained.

In the heat exchanger of this embodiment, its usage form is not particularly limited, and it is possible to use only one or two or more. When used alone, as described above, the members to be heat exchanged are brought into contact with the upper and lower surfaces of the heat exchanger. When using two heat exchangers, for example, the heat exchange target member can be placed between the two heat exchangers. Furthermore, when two or more heat exchangers are used, the heat exchangers and the heat exchange target members can be arranged and used so as to be alternately overlapped.

As described above, according to the heat exchanger of this embodiment, the pair of inlets and outlets (an outlet and an inlet) 16, 16 are arranged together on one end side in the longitudinal direction (lengthwise direction), so that they are connected to the inlet and outlet 16. External piping that is connected can be consolidated at one end, and piping connection work etc. can be performed efficiently and smoothly. Furthermore, since the external piping is concentrated on one side, the degree of freedom in the arrangement (layout) of heat exchange components such as batteries can be increased, and versatility can be improved.

Furthermore, since the structure is such that the heat exchange medium (cooling liquid) flows inside the outer envelope 1 made of the outer envelope laminate material L1, there is a low possibility that the heat exchange medium will leak out, and high reliability can be obtained.

Further, according to the heat exchanger of this embodiment, the inner fins 2 are moved in the direction of the troughs so that the heat exchange medium flows from one side 11c of the heat exchanger (concave portion 11) to the other side 11c. Also, since the ridge direction is arranged along the lateral direction, the structure is simpler compared to, for example, a heat exchanger in which the inner fin is arranged with its trough direction and ridge direction along the front-rear direction. can be achieved. In other words, if the outlet and inlet are arranged at the front end of the heat exchanger, and the inner fins are arranged with their valleys and peaks (flow path direction) in the front-rear direction, the heat flowing from the inlet to the front end The exchange medium is led to the rear end, made a U-turn there, returned to the front end, and then flows out from the outlet. In a heat exchanger with this configuration, the flow path is used as a forward flow path toward the rear. The structure for partitioning the return flow path toward the front, the U-turn portion, and the like become complicated, and there is a risk that the structure will become complicated.

Therefore, as in this embodiment, by arranging the inner fins 2 with the direction of the intermediate flow path 18 facing in the left-right direction (lateral direction), it is possible to create a configuration in which the flow path is partitioned into an outgoing flow path and a return flow path. Since there is no need for a configuration to form a turn portion, the structure can be simplified, and manufacturing can be facilitated while reducing costs.

Furthermore, in a heat exchanger in which the inner fin flow path is arranged along the front-rear direction, the heat exchange medium flows in a concentrated manner into the flow path near the inlet, making it possible to smoothly disperse the heat exchange medium laterally. Otherwise, the flow of the heat exchange medium may become uneven, which may reduce heat exchange performance.

On the other hand, in the heat exchanger of this embodiment in which the intermediate flow paths 18 formed by the inner fins 2 are arranged along the lateral direction, the heat exchanger is evenly distributed from one inflow and outflow path (inflow path 17) to each intermediate flow path 18. Since the flow of the heat exchange medium is less likely to be uneven, the heat exchange medium can be distributed evenly throughout the inner fin, and the heat exchange performance can be further improved.

Furthermore, in the heat exchanger of this embodiment, a gap is formed between both sides of the inner fin 2 and both sides 11c in the recessed part 11, and the gap is used as the inflow/outflow passage 17. There is no need to separately provide a channel member or the like for forming the inflow/outflow passage 17, and the number of parts can be reduced accordingly, making it possible to further simplify the structure.

In addition, in the heat exchanger of this embodiment, since the inner fins 2 are formed in a square wave shape, a sufficient contact area with the outer envelope 1 can be secured, and the member to be cooled that comes into contact with the outer surface of the outer envelope 1 can be It is possible to improve the heat exchange efficiency between the two, and it is possible to obtain high heat exchange performance. Furthermore, since a large bonding area between the inner fin 2 and the outer envelope 1 can be ensured, the attachment strength of the inner fin 2 to the outer envelope 1 can be improved, and occurrence of poor contact can be reliably prevented.

Furthermore, since the inner fins 2 are formed into a square wave shape, a large number of rising walls between the bottom wall of the recess and the top wall of the projection are arranged perpendicularly to the upper and lower walls of the outer envelope 1. Therefore, the inner fin 2 can fully perform its function as a reinforcing member, and can ensure high strength against both internal and external pressures, and can further improve operational reliability. In particular, when a plurality of heat exchangers are used in a stacked manner, sufficient pressure resistance can be ensured, a stable form can be reliably maintained, and high heat exchange performance can be reliably obtained. Furthermore, since sufficient pressure resistance can be ensured, there is no need to separately provide a reinforcing member, and the number of parts can be reduced accordingly, making it possible to simplify the structure and reduce costs.

Further, according to the heat exchanger of this embodiment, since the tray member 10, cover member 15, inner fin 2, and entrance/exit member 3 as the structural members are manufactured based on synthetic resin, each structural member is appropriately heat-fused. You can easily make it by just wearing it. Therefore, the heat exchanger of this embodiment aims to reduce costs and improve productivity compared to conventional metal heat exchangers that are manufactured by difficult and troublesome bonding processes such as brazing. be able to.

Further, the heat exchanger of this embodiment can further improve production efficiency and reduce costs, unlike the case where complicated and restricted metal processing such as metal plastic processing or cutting is used.

Furthermore, since the heat exchanger of this embodiment is formed by bonding together the tray member 10 and the cover member 15 made of a thin laminate sheet (laminate material) L1, sufficient thickness and weight reduction can be ensured. be able to.

Furthermore, in the heat exchanger of this embodiment, since the outer envelope 1 is made of the laminate material L1, the shape and size of the heat exchanger itself can be easily changed, and as mentioned above, the thickness, strength, heat exchange performance, etc. Since the structure can be easily changed, it is possible to easily create an appropriate configuration according to the heat exchanger mounting position, etc., increasing the degree of freedom in design and improving versatility.

In the above embodiment, the width (channel cross section) of the pair of inflow and outflow passages 17 is constant at any position in the front and back directions, but the present invention is not limited to this. can also be formed to have different widths depending on the position of the inflow/outflow passage 17 in the front and back direction. For example, as shown in FIG. 7A, by forming the inner fin 2 such that the lateral dimension (width) becomes narrower from the front to the rear, a pair of outflow channels 17 formed on both sides of the inner fin 2 can be formed. For example, the width of one inflow/outflow path (inflow path) 17 on the upper side and the other outflow/inflow path (outflow path) 17 on the lower side is formed so that the width becomes wider toward the rear. Alternatively, as shown in FIG. 7B, one of the inflow and outflow passages 17 may be formed to become wider toward the rear, and the other inflow and outflow passage 17 may be formed to become narrower toward the rear. Alternatively, as shown in FIG. 7C, the pair of inflow and outflow passages 17, 17 may be formed so that they become narrower toward the rear. In particular, as shown in FIG. 7A, it is preferable to adopt a configuration in which the pair of inflow and outflow passages 17, 17 become narrower toward the rear. That is, the amount of heat exchange medium that has flowed from the inlet/outlet member 3 into one of the inflow and outflow channels (inflow channel) 17 decreases from the upstream side (front side) to the downstream side (rear side). There is a tendency to For this reason, by making the flow channel width (channel cross section) gradually smaller so that the upstream side of one of the inflow and outflow channels 17 is narrowed and the downstream side is widened, the heat exchange medium is The amount of water flowing into the intermediate flow path 17 can be adjusted evenly. Therefore, the heat exchange medium can be distributed evenly over the entire area of the inner fins 2, so that the heat exchange performance can be further improved.

In this embodiment, as shown in FIG. 7A, when forming both side edges of the inner fin 2 obliquely, the inclination angle θ2 is preferably set to 1° to 20°, more preferably 2° to 20°. It is best to set it to 5°.

Further, in the above embodiment, the inner fin 2 has a square wave shape. However, the present invention is not limited to this, and the inner fin 2 may have a circular wave shape as shown in FIG. A general wave shape (sine wave shape) in which arcuate concave portions 25 and convex portions 26 are formed in succession, a so-called analog signal waveform, may be adopted.

Furthermore, in this embodiment, since the inflow and outflow passages 17 are formed on both sides of the inner fins 2 in the recesses 11 of the outer envelope 1, the inner fins 2 are arranged at a laterally intermediate position in the recesses 11. There is a need to. As a method for arranging the inner fin 2 at an intermediate position in the width direction within the recess 11, before temporarily assembling the tray member 10, the cover member 15, the inner fin 2, and the entrance/exit member 3, the inner fin 2 is placed in the recess. By temporarily fixing and positioning the inner fins 2 to the bottom surface of the inner fins 11 by spot welding or the like, and then temporarily assembling them in that state and performing a heat-sealing process, it is possible to attach the inner fins 2 to an accurate position within the outer envelope 1. can.

Furthermore, as shown in FIG. 6, by interposing spacers 20 between both end surfaces of the inner fin 2 and the inner surfaces of both side walls of the recessed part 11, the inner fin 2 can be attached to an accurate position within the outer envelope 1. I can do it.

Further, as shown in FIG. 9, the angle θ1 at the corner between the bottom wall and both side walls of the concave portion 11 in the tray member 10 is set to be an obtuse angle, and the inner fin 2 is attached to the obtuse corner. By installing the lower end corner portion, an inflow/outflow passage 17 having a triangular cross section that becomes wider upward may be formed between both side walls of the recessed portion 11 and the inner fin 2. Note that this obtuse angle θ1 is preferably set to 95° to 150°.

<Example 1>
Outer packaging laminate material: PET12/Adhesive/AL120/Adhesive/CPP30
Inner core laminate material: CPP30/Adhesive/AL120/Adhesive/CPP30
The outer envelope laminate material L1 includes a heat transfer layer 51 made of Al foil with a thickness of 120 μm, and a thermal adhesive layer laminated on the inner surface of the heat transfer layer 51 via an adhesive and made of a CPP film with a thickness of 30 μm. 52 and a protective layer 53 laminated on the outer surface of the heat transfer layer 51 via an adhesive and made of a PET film with a thickness of 12 μm was prepared. As the adhesive, a two-component curing polyester polyurethane adhesive was used.

The inner core laminate material L2 includes a heat transfer layer 61 made of Al foil with a thickness of 120 μm, and a heat-sealed layer laminated with an adhesive on both sides of the heat transfer layer 61 and made of a CPP film with a thickness of 30 μm. A layer 62 was prepared. As the adhesive, a two-component curing polyester polyurethane adhesive was used.

A tray member 10 and a cover member 15 corresponding to the first embodiment shown in FIGS. 1 to 3 were manufactured using the outer packaging laminate material L1. That is, deep drawing was performed on each of the outer laminate materials L1 of the above examples and comparative examples, resulting in a depth of 4 mm, a bottom width of 80 mm, an opening width of 81.4 mm, a length of 160 mm, and a corner angle of 10° (Fig. 9 A tray member 10 having a recessed part 11 having an opening angle θ1 of the side wall of the tray member 10 shown in FIG. .

The cover member 15 was produced by cutting each of the above-mentioned outer packaging laminate materials L1 into a length of 180 mm and a width of 100 mm. Further, two holes each having a diameter of 13 mm were formed in the front end (end in the vertical direction) of the cover member 15 in a row in the horizontal direction to serve as an entrance/exit 16 .

Furthermore, the inner fin 2 of the first embodiment shown in FIGS. 2 to 5 was manufactured using the inner core laminate material L2. That is, the inner core laminate material L2 is subjected to embossing roll processing to form a square wave shape with a half pitch Pf/2 of 4 mm, a width W11 of the bottom of the recess and a width W12 of the top of the convex part of 4 mm, a fin thickness Tf of 1 mm, and a fin height of 4 mm. Inner fin 2 was produced.

Furthermore, this inner fin 2 was cut into 76 mm in the horizontal direction, which is the flow direction (the direction of the ridges and the direction of the valleys), and 140 mm in the longitudinal direction, which is the pitch direction (the wave direction). Furthermore, as shown in FIG. 7A, with one end (front end) in the vertical direction as the vertex, trimming is performed so that both edges are sloped at an inclination angle θ2 of 3 degrees, and from one end (front end) to the other end (rear end). A trapezoidal inner fin 2 whose width gradually becomes narrower was manufactured.

Further, as shown in FIGS. 2 and 3, injection molding was performed using random PP (MFR at 230° C. according to JIS K7210: 15 g/10 min.) to produce the doorway member 3. This entrance/exit member 3 has a mounting box portion 31 having a length of 80 mm, a width of 20 mm, a plate thickness of 2 mm, a pipe portion 33 having an inner diameter of 8 mm, an outer diameter of 11 mm, and a length of 5 mm. Note that a partition wall 35 is provided within the mounting box portion 31 to partition the upstream and downstream chambers 34, 34 on both sides.

Subsequently, the entrance/exit member 3 was housed in one end (front end) of the concave portion 11 of the tray member 10 with the pair of pipe portions 33 facing upward. Furthermore, the inner fin 2 was arranged on the rear side of the entrance/exit member 3 in the concave portion 11 so that the intermediate flow path 18 (the direction of the ridges and the direction of the troughs) faced in the lateral direction. At this time, the inner fins 2 were arranged so that gaps (inflow and outflow passages 17, 17) were evenly formed between both sides of the recessed part 11.

Next, the cover member 15 was placed so as to close the concave portion 11 of the tray member 10 from above. At this time, the pipe portions 33, 33 of the entrance/exit member 3 were inserted through the entrance/exit ports 16, 16 of the cover member 15, and were made to protrude above the cover member 15.

In this way, a heat exchanger temporary assembly in an unbonded state was produced, and the temporary assembly was heated at a temperature of 200°C, a pressure of 0.3 MPa, and a time of 3 seconds using upper and lower sealing molds that matched the shape of the temporary assembly. By performing heat fusion processing under fusion conditions to thermally bond (heat fusion) the joints between each part, and then trimming the seal width (flange width) at the outer periphery of the molding to 5 mm around the entire circumference. The heat exchanger of Example 1 was manufactured.

<Example 2>
As shown in FIG. 6, a doorway member 3 was prepared in which a baffle plate 36 of 10 mm in length and 5 mm in width was integrally formed on a partition wall 35 so as to protrude rearward (toward the inner fin 2 side). Furthermore, a notch measuring 10 mm in length and 5 mm in width was formed in a portion of the front end of the inner fin 2 corresponding to the baffle plate 36.

Furthermore, when housing the inner fin 2 and the entrance/exit member 3 in the tray member 10, the baffle plate 36 of the entrance/exit member 3 was inserted into the notch of the inner fin 2. Except for this, a heat exchanger of Example 2 was produced in the same manner as in Example 1 above.

<Cooling performance test>
The heat exchangers of Examples 1 and 2 were placed horizontally on a hot plate set at 60° C. with the pipe portions 33 facing upward.

In this state, tap water with a water temperature of 23° C. is introduced as a cooling liquid from one pipe section 33 on the inlet side of each of the heat exchangers of Examples 1 and 2 at a flow rate of 0.2 L/min, and the cooling liquid is heated as described above. As described above, one upstream/downstream chamber (upstream chamber) 34, one outflow/inflow path (inflow path) 17, intermediate flow path 18 of the inner fin 2, other outflow/inflow path (outflow path) 17, and the other upstream/downstream chamber. The cooling liquid was circulated within the heat exchanger by flowing out from the (downstream chamber) 34 and the other pipe section 33 on the outlet side.

In each of the heat exchangers of Examples 1 and 2, the surface temperatures at 10 mm (near the entrance member 3), 70 mm (approximately the center of the heat exchanger), and 140 mm (farthest from the entrance member 3) was measured. The results are shown in Table 1.

As is clear from Table 1, in the heat exchanger of Example 1, the temperature change can be suppressed to within 10°C between the vicinity of the entrance/exit member 3 and the farthest part, and especially in the heat exchanger of Example 2, the temperature change can be suppressed to within 10°C. There was almost no change in surface temperature depending on location. Therefore, in the heat exchangers of Examples 1 and 2, the cooling liquid flows evenly throughout the heat exchanger, and stable heat exchange performance (cooling performance) can be obtained without bias.

The heat exchanger of this invention can be used to prevent heat generation around the CPU and batteries of smartphones and personal computers, to prevent heat generation around the displays of LCD TVs, organic EL TVs, and plasma TVs, and to prevent heat generation around the power modules and batteries of automobiles. In addition to being used as a cooler (cooling device), it can also be used as a heater (heating device) for floor heating and snow removal.

1: Outer envelope 10: Tray member 11: Concave portion 11a: Front side portion 11b: Rear side portion 11c: Side portion 15: Cover member 16: Entrance/exit (entrance, exit)
17: Inflow/outflow path (inflow path, outflow path)
2: Inner fin 25: Concave portion 26: Convex portion 3: Entrance/exit member 34: Upstream and downstream chambers (upstream chamber, downstream chamber)
35: Partition wall 36: Baffle plate 51: Heat transfer layer 52: Heat fusion layer 61: Heat transfer layer 62: Heat fusion layer L1: Outer envelope laminate material L2: Inner core laminate material

Claims (6)

an outer envelope having both vertical edges as front and rear sides and both horizontal edges as both sides; an inner fin provided inside the outer envelope and having an uneven portion; and an interior of the outer envelope. A heat exchanger comprising an inlet and an outlet for inputting and outputting a heat exchange medium to and from the heat exchanger,
The outer envelope is made of an outer envelope laminate material in which a resin heat-sealing layer is provided on the inner surface of a metal heat transfer layer,
The inner fin is composed of an inner core laminate material in which a resin heat-sealing layer is provided on both sides of a metal heat transfer layer,
The inlet and the outlet are arranged side by side in the vicinity of the front side of the outer envelope,
The heat exchange medium flowing into the outer envelope from the inlet passes through the inner fin installation part and flows out from the outlet ,
An inflow path and an outflow path are provided between both side portions in the outer envelope and both side edges of the inner fin,
The inner fin is formed in a wavy shape in which concave portions and convex portions are alternately and consecutively provided, and the inner fin is arranged such that its ridge direction and valley direction are along the lateral direction,
The heat exchange medium flowing in from the inlet passes through the inflow path, the inner fin installation part, and the outflow path, and is configured to flow out from the outlet,
A box-shaped entrance/exit member is provided within the outer envelope corresponding to the inlet and the outlet,
The inlet/outlet member includes an upstream chamber for supplying the heat exchange medium that has flowed in from the inlet to the inflow path, a downstream chamber that allows the heat exchange medium that has been supplied from the outflow path to flow out from the outlet, and a downstream chamber that allows the heat exchange medium to flow out from the outlet. A heat exchanger comprising a partition wall for restricting flow from the chamber side to the downstream chamber side . an outer envelope having both vertical edges as front and rear sides and both horizontal edges as both sides; an inner fin provided inside the outer envelope and having an uneven portion; and an interior of the outer envelope. A heat exchanger comprising an inlet and an outlet for inputting and outputting a heat exchange medium to and from the heat exchanger,
The outer envelope is made of an outer envelope laminate material in which a resin heat-sealing layer is provided on the inner surface of a metal heat transfer layer,
The inner fin is composed of an inner core laminate material in which a resin heat-sealing layer is provided on both sides of a metal heat transfer layer,
The inlet and the outlet are arranged side by side in the vicinity of the front side of the outer envelope,
The heat exchange medium flowing into the outer envelope from the inlet passes through the inner fin installation part and flows out from the outlet ,
An inflow path and an outflow path are provided between both side portions in the outer envelope and both side edges of the inner fin,
The inner fin is formed in a wavy shape in which concave portions and convex portions are alternately and consecutively provided, and the inner fin is arranged such that its ridge direction and valley direction are along the lateral direction,
The heat exchange medium flowing in from the inlet passes through the inflow path, the inner fin installation part, and the outflow path, and is configured to flow out from the outlet,
Gaps are provided between both side portions in the outer envelope and both side edges of the inner fin, and the inflow path and the outflow path are formed by the gaps on both sides,
A box-shaped entrance/exit member is provided within the outer envelope corresponding to the inlet and the outlet,
The inlet/outlet member includes an upstream chamber for supplying the heat exchange medium that has flowed in from the inlet to the inflow path, a downstream chamber that allows the heat exchange medium that has been supplied from the outflow path to flow out from the outlet, and a downstream chamber that allows the heat exchange medium to flow out from the outlet. A heat exchanger comprising a partition wall for restricting flow from the chamber side to the downstream chamber side . 3. The heat exchanger according to claim 1 , wherein the inner fin is formed into a rectangular wave shape with a flat bottom surface and a top surface of the convex portion. A gap is provided between the entrance/exit member and the inner fin, and a baffle plate is provided in the gap to restrict the flow of the heat exchange medium from the inflow path side to the outflow path side . The heat exchanger according to any one of the above . The inner fin is formed so that the lateral dimension gradually decreases toward the rear, so that the flow passage cross section of the inflow passage and the outflow passage gradually increases from the front side toward the rear. The heat exchanger according to any one of claims 1 to 4 , wherein: 2. The outer casing includes a tray member having a recess formed in an intermediate region for accommodating the inner fin, and a cover member disposed to close the recess of the tray member. The heat exchanger according to any one of items 1 to 5 .

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