JP2020161449A - Heat exchanger - Google Patents

Abstract

To provide a high quality heat exchanger without liquid leakage.SOLUTION: A heat exchanger according to the present invention includes an exterior body 1, and an inner fin 2 housed in the exterior body 1 with a part of the inner fin in contact with the inner peripheral surface of the exterior body 1. The exterior body 1 is composed of a laminate material L1 in which a resin protective layer 55 and a resin sealant layer 52 are laminated in this order on the inner surface side of a metal foil layer 51, and the inner fin 2 is composed of a laminate material L2 in which a resin coating layer 62 is laminated on both sides of the metal foil layer 61. The protective layer 55 in the exterior body 1 is configured to remain in a missing portion of the sealant layer 52 to prevent the metal foil layer 51 from being exposed.SELECTED DRAWING: Figure 4

Description

The present invention relates to a heat exchanger manufactured by using a laminated material in which a resin layer is laminated on a metal foil layer.

With the increasing size and performance of electronic devices such as smartphones and personal computers, it is important to take measures against heat generation around the CPU of electronic devices. Depending on the model, a water-cooled cooler or heat pipe may be incorporated to load heat on electronic components such as the CPU. There have been many proposals for techniques for avoiding the adverse effects of heat by preventing heat from being trapped inside the housing.

In addition, the battery module mounted on an electric vehicle or a hybrid vehicle generates a large amount of heat in the battery pack because it continuously charges or discharges a large capacity. For this reason, a technique has been proposed in which a water-cooled cooler and a heat pipe are incorporated in the battery module as in the case of the above-mentioned electronic device to avoid adverse effects due to heat.

Further, measures such as assembling a cooling plate or a heat sink for a power module made of silicon carbide (SiC) as a measure against heat generation have been proposed.

By the way, in electronic devices such as the above-mentioned smartphones and personal computers, the housing is thin, and many electronic components and coolers are incorporated in the limited space in the thin housing, so the cooler itself is also thin. Will be.

Conventionally, a thin cooler such as a heat pipe incorporated in a small electronic device generally brazes or diffuses a plurality of metal processed parts obtained by processing a metal having high heat conductivity such as aluminum. It is manufactured by joining with (Patent Documents 1 to 3 and the like).

However, in the above-mentioned conventional cooler for small electronic devices, each component is manufactured by plastic working such as casting and forging, and metal processing (machining) such as removal processing such as cutting, which is troublesome and has restrictions. It is strict, especially there is a limit to thinning, and it is difficult to make it thinner than the current one.

Furthermore, the above-mentioned conventional cooler needs to be manufactured by using metal processing (metal-to-metal joining) such as brazing or diffusion joining, which is difficult to join when joining each component, which is difficult to manufacture. Not only that, production efficiency is reduced and costs are increased.

Japanese Unexamined Patent Publication No. 2015-59693 Japanese Unexamined Patent Publication No. 2015-141002 Japanese Unexamined Patent Publication No. 2016-189415

Under such circumstances, the applicant of the present application is proceeding with research on a technique for using a laminated material in which a resin layer is laminated on a metal foil layer as an exterior body of a heat exchanger.

However, when the laminate material is used for the exterior body of equipment such as a heat exchanger, the heat exchange medium such as the coolant filled inside the exterior body may leak, and this liquid leakage is surely prevented. The development of possible technology is about to begin.

The present invention has been made in view of the above problems, and provides a heat exchanger that can be manufactured easily and efficiently, can reduce costs, and can reliably prevent liquid leakage while reducing the thickness. The purpose.

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

[1] An outer body through which a heat exchange medium flows is provided, and an inner fin that has an uneven shape and is housed in the outer body in a state where a part of the outer body is in contact with the inner peripheral surface of the outer body. It ’s a heat exchanger,
The exterior body is composed of a laminate material in which a resin protective layer and a resin sealant layer are laminated in this order on the inner surface side of the metal foil layer.
The inner fin is made of a laminate material in which resin coating layers are laminated on both sides of the metal foil layer.
A heat exchanger characterized in that the protective layer in the exterior body is configured to remain in the missing portion of the sealant layer to prevent exposure of the metal foil layer.

[2] The heat exchanger according to item 1 above, wherein the protective layer of the exterior body is made of a resin having a melting point higher than that of the sealant layer.

[3] The heat exchanger according to item 1 or 2 above, wherein the protective layer of the exterior body is composed of the metal foil layer and the resin film or sheet laminated on the sealant layer.

[4] The heat exchanger according to any one of items 1 to 3 above, wherein the laminating material constituting the exterior body includes a heat-resistant layer made of resin laminated on the outer surface side of the metal foil layer.

[5] The heat exchanger according to any one of items 1 to 4 above, wherein the sealant layer of the exterior body and the coating layer of the inner fin are made of the same type of heat-sealing resin.

[6] The heat according to any one of items 1 to 5 above, wherein the edge of the inner fin is provided with a resin coating portion for preventing the metal foil layer from being exposed from the edge. Exchanger.

[7] An extension portion is formed so that the edge of the coating layer on both sides of the edge of the inner fin extends in the edge extension direction, and the edge of the metal foil layer is formed on each of the coating layers on both sides. The heat exchanger according to any one of items 1 to 6 above, which is arranged so as to be immersed in the edge of the extension portion.

[8] Item 1 of the preceding item, which includes a joint member having a pipe portion arranged in a penetrating state through an entrance / exit provided in the exterior body and a mounting portion to which the pipe portion is connected and housed inside the exterior body. The heat exchanger according to any one of items to 7.

[9] The heat exchanger according to item 9, wherein at least the skin portion of the mounting portion of the joint member is made of a heat-sealing resin of the same type as the sealant layer of the exterior body.

According to the heat exchanger of the invention [1], since the protective layer is provided between the metal foil layer and the sealant layer in the laminating material for the exterior body, it is assumed that the sealant layer is missing due to excessive heat adhesion or the like. However, it is possible to prevent the metal foil layer from being exposed by covering the metal foil layer with the protective layer remaining in the missing portion. Therefore, the metal foil layer is not inadvertently exposed to the heat exchange medium, and the occurrence of liquid leakage due to corrosion of the metal foil layer can be prevented. Further, in the heat exchanger of the present invention, since the exterior body is manufactured by using a laminated material, it is not necessary to use troublesome metal processing, it can be manufactured efficiently and easily, the cost can be reduced, and it is sufficient. It can also be made thinner.

According to the heat exchangers of the inventions [2] and [3], the above effects can be obtained more reliably.

According to the heat exchanger of the invention [4], corrosion of the metal foil layer due to external factors such as dew condensation can be prevented.

According to the heat exchanger of the present invention [5], the sealant layer of the exterior body and the coating layer of the inner fin can be heat-bonded with sufficient mounting strength.

According to the heat exchangers of the inventions [6] and [7], it is possible to prevent the edge of the metal foil layer of the inner fin from being exposed, and it is possible to avoid the adverse effect of the metal foil layer of the inner fin on the exterior body. ..

According to the heat exchangers of the inventions [8] and [9], the heat exchange medium can be smoothly flowed in and out of the exterior body through the pipe portion, the heat exchange performance can be improved, and the mounting portion is mounted inside the exterior body. It can be heat-bonded to the peripheral surface in a stable state with sufficient mounting strength, and the sealing property around the entrance and exit can be further improved.

FIG. 1 is a perspective view showing a heat exchanger according to an embodiment of the present invention. FIG. 2 is a perspective view showing the heat exchanger of the embodiment in an exploded manner. FIG. 3 is a perspective view showing a part of the heat exchanger of the embodiment cut out. FIG. 4 is an enlarged cross-sectional view showing a portion surrounded by the alternate long and short dash line S1 in FIG. FIG. 5 is an enlarged cross-sectional view showing a portion surrounded by the alternate long and short dash line S2 in FIG. FIG. 6 is a notched perspective view showing the periphery of the contact portion between the edge portion of the inner fin and the bottom surface of the tray member in the heat exchanger of the present embodiment in an enlarged manner. FIG. 7 is a cross-sectional view taken along the line DD of FIG. 8A and 8B are views showing a laminate material for inner fins according to a first modification of the present invention, where FIG. 8A is a plan view and FIG. 8B is a cross-sectional view of an end portion. FIG. 9 is a cross-sectional view of an end portion of the inner fin laminating material according to the second modification of the present invention. FIG. 10 is an enlarged cross-sectional view showing a contact portion between the inner fin and the bottom surface of the tray member in a heat exchanger that deviates from the gist of the present invention, and is a cross-sectional view of a portion corresponding to FIG. FIG. 11 is a perspective view for explaining a corroded portion of a tray member in a heat exchanger that deviates from the gist of the present invention.

FIG. 1 is a perspective view showing a heat exchanger according to an embodiment of the present invention, FIG. 2 is a perspective view showing an exploded view of the heat exchanger of the embodiment, and FIG. 3 is a cutout of a part of the heat exchanger of the embodiment. It is a perspective view which shows.

As shown in these figures, the heat exchanger of the present embodiment is used as a heat transfer panel, a heat transfer tube, or the like, and has an exterior body 1 as a casing and an inner fin housed inside the exterior body 1. (Internal fins) 2 and a pair of joint members 3 and 3 housed in both ends of the exterior body 1 are provided.

The exterior body 1 is composed of a tray member 10 having a rectangular shape in a plan view and a cover member 15 having a rectangular shape in a plan view.

In the tray member 10, the intermediate region excluding the outer peripheral edge portion thereof is recessed downward by using a cold forming method such as deep drawing molding or extrusion molding to form a recess 11 and an opening of the recess 11. The flange portion 12 is integrally formed around the edge portion so as to project outward.

The tray member 10 and the cover member 15 are made of a laminating material L1 which is a flexible or flexible laminating sheet.

As shown in FIG. 4, the laminating material L1 for the exterior body is made of a metal foil layer 51 made of a metal foil and a resin film or a resin sheet laminated on one surface (inner surface) of the metal foil layer 51 with an adhesive. The protective layer 55, the sealant layer 52 made of a resin film or resin sheet laminated on one surface (inner surface) of the protective layer 55 via an adhesive, and the other surface (outer surface) of the metal foil layer 51 via an adhesive. A heat-resistant layer 53 made of a resin film or a resin sheet laminated with the resin film is provided. In the present embodiment, the term "foil" is used to include a film, a thin plate, and a sheet.

As the metal foil layer 51 in the laminate material L1, 1000 series, 3000 series, 5000 series, 8000 series aluminum foils, copper foils, stainless steel foils, nickel foils, titanium foils and the like can be preferably used. In the present embodiment, the terms "aluminum", "copper", "nickel", and "titanium" are used to include alloys thereof.

The metal foil layer 51 is also referred to as a heat transfer layer or a heat collecting layer, and it is preferable to use a metal foil layer 51 having a thickness of 8 μm to 300 μm, and more preferably 100 μm or less.

Further, by subjecting the metal foil layer 51 to a surface treatment such as a chemical conversion treatment, it is possible to further improve the durability of the metal foil layer 51, such as preventing corrosion of the metal foil layer 51 and improving the adhesiveness with the resin.

The chemical conversion treatment is performed as follows, for example. That is, the surface of the degreased metal foil is coated with an aqueous solution of any one of the following 1) to 3) and then dried to perform a 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 a metal salt of fluoride and a non-metal salt of fluoride.

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

3) At least one resin selected from the group consisting of phosphoric acid, acrylic resin, chitosan derivative resin and phenolic resin, and at least one compound selected from the group consisting of chromic acid and chromium (III) salt. An aqueous solution of a mixture containing at least one compound selected from the group consisting of a metal salt of fluoride and a non-metal salt of fluoride.

The chemical conversion coating, chromium add-on amount is preferably set to 0.1mg ^{/ m 2} ~50mg ^/ m 2 as a (per one surface), and still more preferably, to set particular to ^{2mg / m 2 ~20mg / m 2} .

The same applies to the metal foil layer 61 of the laminating material L2 for fins, which will be described later, with respect to this surface treatment.

As will be described later, when the sealant layer 52 is partially broken or melted and the sealant layer 52 is missing, the protective layer 55 remains in the missing portion with respect to the metal foil layer 51. By maintaining the coated state, the metal foil layer 51 is prevented from being exposed, thereby preventing corrosion of the metal foil layer 51. Therefore, the protective layer 55 is preferably made of a resin having a higher strength and a higher melting point than the sealant layer 52.

As the protective layer 55, for example, a polyethylene terephthalate resin film, a polyamide resin film, a polyethylene naphthalate resin film, a polypropylene resin film, or the like can be preferably used.

Further, as the protective layer 55, as described above, it is preferable to use a resin having a melting point higher than that of the sealant layer 52, more preferably a resin having a melting point higher than 20 ° C. or higher. That is, when a resin having a high melting point is used as the protective layer 55, it is possible to prevent the protective layer 55 from melting when the heat-sealing layer 62 of the inner fin 2 is heat-sealed to the sealant layer 52 of the exterior body 1. , The metal foil layer 51 can be reliably protected.

Further, the protective layer 55 can be formed by a dry laminate that is formed in a dry state.

As the protective layer 55, it is preferable to use a stretched film. Still protective layer 55, the water vapor transmission rate conforming to JIS K7129 is to use one of 50g ^/ (m 2 · 24h) or less preferred.

Further, it is preferable to use a protective layer 55 having a thickness of 12 μm to 50 μm.

As the sealant layer 52, a film or sheet composed of polyolefin (unstretched polypropylene (CPP), polyethylene (LDPE, LLDPE)) or a modified resin thereof, a fluororesin, a polyester resin, a vinyl chloride resin or the like is preferably used. be able to.

As the sealant layer 52, a sealant layer 52 having a thickness of 12 μm to 50 μm can be preferably used.

As the heat-resistant layer 53, a film or sheet made of polyethylene terephthalate resin, polyamide resin, polyethylene naphthalate resin, polypropylene resin or the like can be preferably used.

In the present embodiment, the film or sheet as the heat-resistant layer 53 has a basic structure of being adhered to the metal foil layer 51 via an adhesive, but if necessary, the heat-resistant layer is formed without using an adhesive. A resin may be applied and coated on the metal foil layer 51 to laminate (deposit) the heat resistant layer 53.

Since the heat-resistant layer 53 is for avoiding dew condensation on the metal foil layer 51 and adverse effects from corrosive components in the atmosphere, a heat-sealing resin is used if the metal foil layer 51 is protected. You can also do it.

Further, since the heat-resistant layer 53 is in direct contact with a cooling target member (heat exchange target member) such as a battery, it is preferably thin in order to improve heat exchange performance. Specifically, it is preferable to use a heat-resistant layer 53 having a thickness of 20 μm to 5000 μm.

Further, as an adhesive layer for adhering each layer of the metal foil layer 51, the protective layer 55, the sealant layer 52 and the heat-resistant layer 53 constituting the exterior body laminate L1, a urethane-based adhesive having a thickness of 1 μm to 5 μm is used. Epoxy-based adhesives, olefin-based adhesives and the like can be preferably used.

The tray member 10 and the cover member 15 of the exterior body 1 are configured by the laminate material L1 having the above configuration. Then, as will be described later, the cover member 15 is arranged so as to close the concave opening of the tray member 10, and the outer peripheral edge portion of the cover member 15 is joined and integrated with the flange portion 12 of the tray member 10 to form an exterior body. 1 is formed.

In this embodiment, the entrances 16 and 16 are formed at both ends of the cover member 15, respectively.

As shown in FIGS. 1 to 3, the inner fin 2 housed in the hollow portion (recess 11) of the exterior body 1 is made of a laminating material L2 which is a flexible or flexible laminating sheet. As shown in FIG. 4, the laminate material L2 is a metal foil layer 61 made of a metal foil, and coating layers 62, 62 made of a resin film or a resin sheet laminated on both side surfaces of the metal foil layer 61 with an adhesive. And have.

The metal foil layer 61 of the laminating material L2 for the inner fin includes copper foil, aluminum foil, stainless steel foil, nickel foil, plated copper foil, and nickel / copper clad metal in which nickel foil and copper foil are clad. The one selected from the above can be preferably used.

The metal foil layer 61 preferably has a thickness of 8 μm to 300 μm, and more preferably 100 μm or less.

Further, as described above, the performance of the metal foil layer 61 can be further improved by applying the same surface treatment as the metal foil layer 51 of the exterior body 1.

As the coating layer 62, a heat-sealing film or sheet composed of polyolefin (unstretched polypropylene (CPP), polyethylene (LDPE, LLDPE)), fluororesin, polyester resin, vinyl chloride resin and the like is preferably used. be able to.

Further, as the adhesive layer for adhering the layers of the metal foil layer 61 and the coating layers 62 and 62 constituting the inner fin laminating material L2, a urethane adhesive having a thickness of 1 μm to 5 μm and an epoxy adhesive are used as described above. Adhesives, olefin-based adhesives and the like can be preferably used.

In the present embodiment, the resin layers 62 and 62 on both sides of the laminate material L2 constituting the inner fin 2 are heat-sealed resins of the same type as the sealant layer 53 of the laminate material L1 constituting the exterior body 1 (same heat fusion resin). It is composed of (the same applies hereinafter) including the resin coating.

The inner fin 2 is formed by applying unevenness processing to the sheet material made of the laminated material L2 to form the unevenness.

The uneven processing may be any processing as long as it can give three-dimensional unevenness to the laminating material L2, but corrugated processing, pleating processing, embossing, etc., are three-dimensional and continuous on the laminating material L2. A processing method capable of imparting unevenness can be preferably used.

Corrugated processing is, for example, forming a corrugated three-dimensional shape in one direction by passing a work such as a laminate material L2 between a pair of rolls in which axial grooves are formed at equal intervals in the circumferential direction. It is a processing method to be performed.

The pleating process is a processing method for forming folds (pleats) by alternately folding a work such as a laminate material L2 on the front and back sides.

The embossing is a processing method for imparting unevenness to a work such as a laminate material L2 by using an embossing roll having an uneven pattern formed on the outer peripheral surface. In the present embodiment, the uneven pattern formed on the embossed roll is not particularly limited, and an uneven pattern such as a diamond pattern, a silk grain shape, a cloth grain shape, a satin finish shape, a polka dot shape, a blind shape, or a streak pattern is used. Can be adopted.

In the present embodiment, the inner fin 2 is manufactured by corrugating the sheet material made of the laminated material L2 to form a wavy uneven shape.

The inner fin 2 is housed in an intermediate portion of the tray member 10 in the recess 11 excluding both ends. The accommodated inner fins 2 are arranged so that the mountain streak direction and the valley streak direction (left-right direction toward the paper surface of FIG. 2) coincide with the length direction of the tray member 10 (left-right direction toward the paper surface of FIG. 2). Is located in. As a result, the tunnel portion and the groove portion formed along the mountain and valley streaks of the inner fin 2 are arranged along the length direction of the tray member 10, and heat is exchanged through the tunnel portion and the groove portion. The medium is configured to smoothly flow from one end side to the other end side in the length direction of the exterior body 1.

As shown in FIG. 2, the pair of joint members 3 and 3 arranged in both ends of the exterior body 1 are made of a molded product of a hard synthetic resin.

The joint member 3 includes a box-shaped mounting box portion 31 having an opening 32 on one side surface, and a pipe portion 33 provided on the upper walls of the mounting box portions 31, 31. The pipe portion 33 communicates with the inside of the mounting box portion 31, and is configured so that the heat exchange medium can come and go between the inside of the pipe portion 33 and the inside of the mounting box portion 31. In this embodiment, the mounting box portion 31 of the joint member 3 constitutes the mounting portion.

In the present embodiment, as the material of the joint member 3, for example, a polyolefin resin such as polyethylene or polypropylene or a modified resin thereof, a heat-sealing resin such as a fluororesin, a polyester resin or a vinyl chloride resin can be preferably used. In particular, it is preferable to use a heat-sealing resin such as high-density polyethylene (HDPE). In the present embodiment, the joint member 3 is made of the same or the same heat-sealing resin as the sealant layer 52 of the laminate material L1 whose outer surface (skin portion) constitutes the exterior body.

The mounting box portions 31 of the joint member 3 are arranged on both sides of the inner fin 2 in the recess 11 of the tray member 10. In this case, the pipe portion 33 of the joint member 3 is arranged upward, and the opening 32 of the mounting box portion 31 is arranged so as to face inward, that is, to face the inner fin 2 side.

In this way, the inner fins 2 and the joint members 3 and 3 are housed in the tray member 10, and the cover member 15 is arranged in the tray member 10 so as to close the opening thereof. In this case, the upward pipe portions 33, 33 of the joint members 3, 3 are inserted and arranged in the doorway 16 of the cover member 15.

By heating the heat transfer panel P temporarily assembled in this way under reduced pressure, the members in contact with each other are heat-sealed and joined and integrated.

That is, the sealant layer 52 of the flange portion 12 of the tray member 10 and the sealant layer 52 of the outer peripheral edge portion of the cover member 15 are joined and integrated by heat adhesion (heat fusion), and sealed in a liquid-tight or airtight state. Here, since the sealant layer 52 of the tray member 10 and the sealant layer 52 of the cover member 15 are made of the same type of heat-sealing resin, both can be reliably fixed with sufficient mounting strength.

Further, the coating layers 62 and 62 at the peak and valley bottoms of the inner fin 2 are joined and integrated with the bottom wall of the tray member 10 and the sealant layer 52 of the cover member 15 by thermal adhesion (heat fusion). Here, since the coating layers 62 and 62 of the inner fin 21 and the sealant layer 52 of the tray member 10 and the cover member 15 are made of the same type of heat-sealing resin, they are securely fixed to each other with sufficient mounting strength. be able to.

Further, the outer peripheral surfaces of the mounting box portions 31 and 31 of the joint members 3 and 3 and the sealant layers 52 and 52 of the tray member 10 and the cover member 15 are joined and integrated by heat bonding (heat fusion). Here, since the joint members 3 and 3 and the sealant layer 52 of the tray member 10 and the cover member 15 are made of the same type of resin, both can be reliably fixed with sufficient mounting strength. Therefore, the peripheral portions of the pipe portions 33 and 33 of the joint members 3 and 3 are adhered to the peripheral portions of the inlets and outlets 16 and 16 of the cover member 15 in a liquid-tight or airtight state, and liquid leaks from the inlets and outlets 16 and 16 and the like. It is possible to surely prevent the trouble of.

The heat exchanger assembled in this way is arranged so that the pipe portions 33, 33 of the joint members 3, 3 project upward from the upper walls (cover members 15) at both ends of the exterior body 1.

The heat exchanger having the above configuration is used as a cooler (cooling device) for cooling a battery or the like as a cooling target member (heat exchange target member). That is, an inflow pipe for inflowing a coolant (cooling water, antifreeze, etc.) as a heat exchange medium (refrigerant) is connected to one pipe portion 33 of the heat exchanger, and cooling is performed to the other pipe portion 33. An outflow pipe for draining the liquid is connected. Further, the battery as the cooling target member is placed in contact with the upper wall and the lower wall of the exterior body 1 of the heat exchanger. Then, in that state, the cooling liquid flows from one pipe portion 33 into the inside of the exterior body 1 through the one joint member 3, and the cooling liquid is circulated through the inner fin 2 portion to circulate the other joint member 3. It flows out from the other pipe portion 33 through the pipe. By circulating the coolant to the exterior body 1 in this way, the battery is cooled by exchanging heat between the coolant and the battery via the upper and lower walls of the inner fin 2 and the exterior body 1. ..

The heat exchanger of the present embodiment is characterized in that a protective layer 55 is provided between the metal foil layer 51 and the sealant layer 52 in the laminate material L1 constituting the exterior body 1. Due to its characteristic configuration, it has excellent corrosion resistance. The mechanism will be described in detail below.

According to the research of the applicant, it has been found that the portion of the metal foil layer 51 of the exterior body 1 where corrosion is likely to occur is the contact portion with the edge portion of the inner fin 2. For example, the portion surrounded by the alternate long and short dash line S2 in FIG. 4 is a contact portion between the bottom surface of the recess in the tray member 10 of the exterior body 1 and the bottom surface of the valley bottom portion of the inner fin 2. Of these contact portions, the inner fin 2 Although the contact portion with the edge portion of the inner fin 2 is likely to be corroded, the portion other than the edge portion of the inner fin 2 is less likely to be corroded.

That is, as shown in FIG. 10, when the exterior body 1 is composed of the laminate material L3 having no protective layer, that is, the laminate material L3 in which the sealant layer 52 is adhered to the inner surface of the metal foil layer 51, heat melting occurs. Even if an excessive amount of heat or pressure is applied at the time of landing, the resin constituting the molten sealant layer 52 and the coating layer 62 is extruded so as to cover the metal foil layer 51 in the portion other than the edge portion of the inner fin 2. The metal leaf layer 51 is not exposed. Therefore, the metal foil layer 51 is not exposed to the coolant, and the occurrence of corrosion in the metal foil layer 51 is prevented. Therefore, pinholes do not occur in the metal foil layer 51, and liquid leakage does not occur.

In particular, in the heat exchanger of the present embodiment, as shown in FIG. 5, when a protective layer 55 having high strength and high melting point is provided between the metal foil layer 51 and the sealant layer 52 of the exterior body 1, the heat exchanger 55 has a high strength and a high melting point. Since the protective layer 55 remains without melting, it is possible to more reliably prevent the metal foil layers 51 and 61 from being exposed, and it is possible to more reliably prevent the occurrence of corrosion and liquid leakage.

However, as described above, it has been found that corrosion is likely to occur at the edge portion of the inner fin 2 at the contact portion with the exterior body 1. For example, FIG. 6 is a notched perspective view showing an enlarged contact portion between the edge portion 21 of the inner fin 2 and the bottom surface of the recess of the exterior body 1 (tray member 10), and is a portion shown by the alternate long and short dash line S3 in FIG. A cutaway perspective view of a portion corresponding to the above, FIG. 7 is a sectional view taken along line DD of FIG. As shown in these figures, when the exterior body 1 and the inner fin 2 are heat-bonded under reduced pressure, the exterior body 1 contracts, and at the time of the contraction, the lower wall of the exterior body 1 is the edge of the inner fin 2. Since it is suppressed by the portion 21, the lower wall of the exterior body 1 is bent so that the outside (right side in FIG. 7) of the contact point with the edge portion 21 is lifted upward as shown by the imaginary line in FIG. Deform. At the time of this deformation, stress is concentrated on the contact point with the edge portion 21 on the lower wall of the exterior body 1, and the molten resin (sealant layer 52) of the exterior body 1 is formed by the edge of the metal foil layer 61 of the inner fin 2. A portion (missing portion) where the sealant layer 52 is interrupted is generated by being extruded. Here, if the exterior body 1 is made of a laminate material (see laminate material L3 in FIG. 10) in which a protective layer is not provided between the sealant layer 52 and the metal foil layer 51, the sealant layer is used. The metal foil layer 51 is exposed in the missing portion of the 52, and the exposed portion is exposed to the coolant in the exterior body 1, and the metal foil layer 51 is corroded. Then, pinholes are formed in the metal foil layer 51 due to the corrosion, and liquid leakage occurs.

For reference, when the outer body 1 and the inner fin 2 made of the laminate material L3 without the protective layer are heat-bonded under reduced pressure, as shown in FIG. 11, the inner fin 2 in the concave bottom wall of the outer body 1 In the contact portion with the edge portion 21, the corroded portion 4 was confirmed in the metal foil layer 51 of the exterior body 1.

On the other hand, in the heat exchanger of the present embodiment, since the protective layer 55 having high strength and high melting point is provided between the metal foil layer 51 and the sealant layer 52 of the exterior body 1, under reduced pressure. Even if the sealant layer 52 of the molten exterior body 1 is extruded by the edge of the metal leaf layer 61 of the inner fin 2 due to heat bonding and a missing portion is generated in the sealant layer 52, the missing portion is not included. The protective layer 55 keeps the metal leaf layer 51 covered. Therefore, it is possible to prevent the metal foil layer 51 from being corroded, and it is possible to reliably prevent the occurrence of pinholes and liquid leakage.

In the present embodiment, if the edge portion 21 of the inner fin 2 does not expose the edge of the metal foil layer 61 to the outside, it may have an adverse effect on the exterior body 1 or the metal foil layer 61 of the inner fin 2 itself. Corrosion can be prevented. For example, as shown in FIG. 8A, as the laminating material L2 constituting the inner fin 2, the resin films for the coating layers 62 and 62 on both sides are one size larger than the metal foil for the metal foil layer 61. Adopt things. As a result, as shown in FIG. 8B, at the edge of the laminating material L2 for the inner fin 2, the coating layers 62 and 62 on both sides are extended, and the metal foil layer is longer than the edge of the extension 66. It is arranged so that the edge of 61 is immersed inward. If the inner fin 2 is manufactured by unevenly processing the laminated material L2, the edge of the metal foil layer 61 of the inner fin 2 is not exposed, so that adverse effects on the exterior body 1 can be avoided. ..

Further, as shown in FIG. 9, as the laminating material L2 for the inner fin 2, the edge is coated with a resin to form a coating portion 65, and the coating portion 65 covers the edge of the metal foil layer 61. Keep it. Even in the inner fin 2 made of the laminated material L2, since the edge of the metal foil layer 61 is not exposed, it is possible to avoid adverse effects on the exterior body 1.

Further, as shown in FIGS. 8 (a) and 8 (b), the covering layers 62 and 62 are extended to form the extension portion 66 at the edge of the inner fin 2, and as shown in FIG. 9, the edge of the covering layers 62 and 62 is formed. When the coating portion 65 is formed between them, when the coating layer extension portion 66 and the coating portion 65 function as a cushioning material for the inner surface of the exterior body 1, and the sealant layer 52 of the exterior body 1 is excessively dissolved. Since it functions as a replenishing material for the above, it is possible to prevent the metal foil layer 51 of the exterior body 1 from being exposed from this point as well, to prevent corrosion and pinholes from occurring more reliably, and to further improve durability. Can be done.

As described above, according to the heat exchanger of the present embodiment, since the protective layer 55 is provided between the metal foil layer 51 and the sealant layer 52 in the laminate material L1 constituting the exterior body 1, the sealant layer 52 Even if is missing due to excessive heat adhesion or the like, the protective layer 55 remains in the missing portion to cover the metal foil layer 51, so that the metal foil layer 55 can be prevented from being exposed. Therefore, the metal foil layer 55 is not inadvertently exposed to the coolant, corrosion of the metal foil layer 55 and the occurrence of pinholes can be prevented, and a high-quality heat exchanger without problems such as liquid leakage is provided. can do.

Further, according to the heat exchanger of the present embodiment, since the exterior body 1 is manufactured by using the laminate materials L1 and L2, it is not necessary to use troublesome metal processing, and it can be manufactured efficiently and easily, and the cost is reduced. It can be reduced, and since it is manufactured by joining the exterior body 1 and the inner fin 2 which are the laminate materials L1 and L2, it is possible to sufficiently reduce the thickness.

Further, in the heat exchanger of the present embodiment, the sealant layer 52 of the exterior body 1 and the coating layer 62 of the inner fin 2 that is heat-sealed to the sealant layer 52 are made of the same type of heat-sealing resin. , Both layers 52 and 62 can be heat-bonded with sufficient mounting strength, peeling and the like can be prevented, and sufficient durability can be obtained. Furthermore, since the same materials are heat-bonded to each other, the adhesiveness is good, excessive heat-bonding can be effectively prevented, and from this point as well, the metal foil layers 51 and 61 can be prevented from being exposed, and the metal foil layer can be more reliably prevented. It is possible to prevent the corrosion of 51 and 61.

Further, in the heat exchanger of the present embodiment, since the heat-resistant layer 53 is laminated on the outer surface side of the exterior body 1, corrosion of the metal foil layer 51 due to external factors such as dew condensation can be prevented more reliably. Durability can be further improved.

Further, in the heat exchanger of the present embodiment, since the pipe portions 33 of the joint members 3 provided at both ends of the exterior body 1 are arranged in a state of penetrating the entrance / exit 16, the exterior body 1 is arranged via the pipe portions 33. On the other hand, the coolant can flow in and out smoothly and in a stable state, and the cooling performance (heat exchange performance) can be improved.

Further, since the mounting box portion 31 of the joint member 3 housed inside the exterior body 1 is made of the same type of heat-sealing resin as the sealant layer 52 of the exterior body 1, the mounting box portion 31 is the exterior body 1. It can be thermally adhered to the inner peripheral surface with sufficient mounting strength, the sealing property around the doorway can be further improved, and liquid leakage from the vicinity of the doorway can be reliably prevented.

In the above embodiment, a case where a heat exchanger is used as a cooler (cooling device) by flowing a heat medium (refrigerant) for cooling inside the heat exchanger has been described as an example, but the present invention is not limited to this. In the above, it is also possible to use the heat exchanger as a heater (heating device) or a heating device (heating device) by passing a heat medium (heat medium) for heating inside the heat exchanger.

Further, in the above embodiment, when the exterior body 1 is manufactured, the three-dimensionally molded tray member 10 and the sheet-shaped cover member 15 are bonded to each other, but in the present invention, the three-dimensionally molded member is attached. (Laminate material) may be pasted together. Further, it is not always necessary to three-dimensionally mold the constituent members of the exterior body 1. For example, when three-dimensional molding is not performed, a bag-shaped exterior body made of a laminated material may be produced by adhering two sheet-shaped laminated materials to each other by heat fusion or the like. ..

Further, in the above embodiment, the case where the exterior body 1 is manufactured by two laminated materials has been described as an example, but the present invention is not limited to this, and in the present invention, one laminated material is folded in half. , Of the overlapping laminated materials, the outer peripheral edge portion excluding the folded portion may be adhered by heat fusion or the like to produce a bag-shaped exterior body. Needless to say, in the present invention, the exterior body may be manufactured by using three or more laminated materials.

Further, in the above embodiment, the laminating materials L1 and L2 have a three-layer or four-layer structure, but the present invention is not limited to this, and in the present invention, a laminating material having a structure of five or more layers is used. Is also good. In short, in the laminating material for the exterior body, the protective layer 55 may be provided between the metal foil layer 51 and the sealant layer 52.

Further, in the above embodiment, the case where the heat exchanger of the present invention is used as the cooler of the battery pack for automobiles or the like has been described as an example, but in the present invention, the heat exchanger other than the cooler of the battery pack has been described. It can also be applied to. For example, heat for cooling power semiconductor elements (power modules) for controlling the main power of power drive equipment such as heat exchangers for heating automobile battery packs, automobile electric motors, industrial machines, home appliances, and information terminals. Exchangers, heat exchangers for cooling the CPU (central arithmetic processing unit) of personal computers, heat exchangers for cooling / heating household or commercial storage batteries, for cooling battery packs (battery modules) of personal computers It can also be used as a heat exchanger for cooling the displays of heat exchangers, LCD TVs, organic EL TVs, and plasma TVs, and as a heat exchanger for floor heating equipment, snow melting equipment such as roofs, passages, and roads in cold regions. it can.

<Example>
Based on the heat exchanger of the above embodiment shown in FIGS. 1 to 3, the heat exchanger of the embodiment was manufactured as follows.

1. 1. Preparation of laminate material L1 (LLDPE40 / adhesive / PET25 / adhesive / AL120 / adhesive / PET25) for exterior body 1 (1) Chromate on aluminum foil (thickness 120 μm) of JIS H4160 A8021 as a metal foil layer The treatment is performed and the base layer is coated on both sides (the amount of chromium adhered is 10 g / m ² per side).

(2) A PET film (thickness 25 μm) is laminated as a heat-resistant layer 53 on one surface (outer surface) of the aluminum foil via a urethane adhesive (thickness 2 μm).

(3) A biaxially stretched polyethylene terephthalate (PET) film (thickness 25 μm) as a protective layer 55 is laminated on the other surface (inner surface) of the aluminum foil via a urethane adhesive (thickness 2 μm).

(4) LLDPE (thickness 40 μm) as the sealant layer 52 is laminated on the other surface (inner surface) of the biaxially stretched PET film as the protective layer 55 via a urethane adhesive (thickness 2 μm).

2. 2. Preparation of Laminate Material L2 (LLDPE40 / Adhesive / AL120 / Adhesive / LLDPE40) for Fin 2 (1) Chromate treatment is applied to the aluminum foil (thickness 120 μm) of A8021 of JIS H4160 to coat both sides with the base layer. (The amount of chromium adhered is 10 g / m ² per side).

(2) LLDPE (thickness 40 μm) is laminated as coating layers 62 and 62 on one and the other surface of the aluminum foil, respectively, via a urethane adhesive (thickness 2 μm).

3. 3. Preparation of Joint Member 3 (HDPE) An HDPE-made joint member 3 in which a pipe portion 33 is integrally molded is prepared in a mounting box portion 31 having a length of 100 mm, a width of 12 mm, and a height of 3 mm. The pipe portion 33 has an inner diameter of φ10 mm, an outer diameter of φ12 mm, and a length of 3 mm.

4. Preparation of component parts of heat exchanger (1) Preparation of tray member 10 The sheet material obtained by cutting the laminate material L1 for the exterior material 1 into a length of 230 mm and a width of 160 mm is used as an Al foil (metal foil layer 51). On the other hand, the concave portion 11 was formed by embossing at a depth of 3 mm using a mold of a corner R4 with a length of 169 mm and a width of 104 mm so that the PET film (heat-resistant layer 53) side was the convex side (outside). Further, the flange portion 12 formed on the peripheral edge of the opening of the recess 11 was cut around so as to have a width of 5 mm to prepare the tray member 10.

(2) Fabrication of Cover Member 15 A sheet material obtained by cutting the laminate material L1 for the exterior body 1 into a length of 180 mm and a width of 115 mm, and joint members 3 and 3 at both ends in the vertical direction (length direction). The doorways 16 and 16 for inserting the pipe portions 33 and 33 of No. 3 were formed to manufacture the cover member 15.

(3) Preparation of Inner Fin 2 A corrugated sheet material obtained by cutting the laminate material L2 for the inner fin 2 into a length of 145 mm and a width of 210 mm so as to be alternately folded back in the horizontal direction with a width (pitch) of 3.5 mm. By processing, a zigzag-shaped inner fin 21 having a height of 3 mm was produced.

5. Assembly and joining of parts (1) Joint members 3 and 3 are housed at both ends of the recess 11 of the tray member 10 in the vertical direction (longitudinal direction) with the pipe portions 33 and 33 facing upward. Further, the inner fin 2 is housed between the joint members 3 and 3 in the recess 11 of the tray member 10. The openings 32, 32 of the joint members 3 and 3 were arranged inward so as to face the ends of the inner fins 2.

(2) The cover member 15 is placed on the flange portion 12 of the tray member 10 with the inside (the side where the biaxially stretched PET film as the protective layer 55 exists) facing down so as to cover the recess 11 of the tray member 10 from above. Placed in. At this time, the upward pipe portions 33, 33 of the joint members 3, 3 in the tray member 10 were inserted through the entrances 16 and 16 of the cover member 15 and arranged so as to project upward from the cover member 15. In this way, a heat exchanger temporary assembly in a non-bonded state was produced, and the flange portion 12 of the tray member 10 was set to 200 ° C. in a state where the heat exchanger temporary assembly was depressurized to 200 mmHg in a chamber type decompressor. The heat exchanger of the example was produced by sealing with a hot plate for 5 seconds and heat-bonding (heat-sealing) each component to each other. By heating under reduced pressure, heat adhesion 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 and the joint members 3 and 3 in contact with them. Can be done strongly.

<Comparison example>
1. 1. Preparation of Laminate Material L3 (LLDPE40 / Adhesive / AL120 / Adhesive / PET25) for Exterior Body 1 (1) Chromate treatment is applied to the aluminum foil (thickness 120 μm) of JIS H4160 A8021 as a metal foil layer, and the bottom The stratum is coated on both sides (chromium adhesion is 10 g / m ² per side).

(2) A PET film (thickness 25 μm) is laminated as a heat-resistant layer 53 on one surface (outer surface) of the aluminum foil via a urethane adhesive (thickness 2 μm).

(3) LLDPE (thickness 40 μm) as a sealant layer 52 is laminated on the other surface (inner surface) of the aluminum foil via a urethane adhesive (thickness 2 μm).

2. 2. The heat exchanger of the comparative example was manufactured in the same manner as in the above embodiment except that the exterior body 1 (tray member 10 and cover member 15) was manufactured using the laminated material L3. That is, the heat exchanger of the comparative example is the same as the heat exchanger of the above embodiment except that the protective layer 55 is not provided on the exterior body 1.

<Accelerated test for corrosion resistance>
As etchant, OY solution _{^{(Cl -: 195ppm, SO 4}} 2-: 60ppm, Cu 2+: 1ppm, Fe 3+: pH3 corrosive liquid containing 30 ppm) was prepared.

The corrosive liquid was introduced into the heat exchangers of Examples and Comparative Examples from one pipe portion 33, circulated inside, and circulated so as to flow out from the other pipe portion 33. As the test conditions during this circulation, the temperature of the corrosive liquid was 60 ° C., the flow velocity was 1 L / min, and the circulation time was 250 hours continuously.

After the test, the appearance of the heat exchangers of Examples and Comparative Examples was visually observed and evaluated. As a result, the heat exchanger of the example did not leak and there was no particular change in appearance. On the other hand, in the heat exchanger of the comparative example, the portion where the edge of the inner fin 2 on the lower wall bottom surface (bottom surface of the tray member 10) and the upper wall lower surface (inner surface of the cover member 15) of the exterior body 1 is in contact with each other. In addition, a whitened corroded portion 4 (see FIG. 11) was confirmed.

As is clear from this test result, it can be seen that the heat exchangers of the examples related to the present invention are excellent in corrosion resistance.

The heat exchanger of the present invention can be suitably used as a power module of an automobile, a cooler around a battery, a cooler for a stationary battery, a cooler for a supercomputer, and the like.

1: Exterior body 2: Inner fin 3: Joint member 33: Pipe portion 51: Metal foil layer 52: Sealant layer 53: Heat resistant layer 55: Protective layer 61: Metal foil layer 62: Coating layer 63: Coating layer 65: Coating portion 66: Extension L1: Laminating material for exterior body L2: Laminating material for inner fins

Claims (9)

A heat exchanger provided with an outer body through which a heat exchange medium flows, and an inner fin that has an uneven shape and is housed in the outer body in a state where a part of the outer body is in contact with the inner peripheral surface of the outer body. And
The exterior body is composed of a laminate material in which a resin protective layer and a resin sealant layer are laminated in this order on the inner surface side of the metal foil layer.
The inner fin is made of a laminate material in which resin coating layers are laminated on both sides of the metal foil layer.
A heat exchanger characterized in that the protective layer in the exterior body is configured to remain in the missing portion of the sealant layer to prevent exposure of the metal foil layer. The heat exchanger according to claim 1, wherein the protective layer of the exterior body is made of a resin having a melting point higher than that of the sealant layer. The heat exchanger according to claim 1 or 2, wherein the protective layer of the exterior body is composed of the metal foil layer and the resin film or sheet laminated on the sealant layer. The heat exchanger according to any one of claims 1 to 3, wherein the laminating material constituting the exterior body includes a heat-resistant layer made of resin laminated on the outer surface side of the metal foil layer. The heat exchanger according to any one of claims 1 to 4, wherein the sealant layer of the exterior body and the coating layer of the inner fin are made of the same type of heat-sealing resin. The heat exchanger according to any one of claims 1 to 5, wherein the edge of the inner fin is provided with a resin coating portion for preventing the metal foil layer from being exposed from the edge. .. An extension portion is formed so that the edge of the coating layer on both sides of the edge of the inner fin extends in the edge extension direction, and the edge of the metal foil layer is formed on each extension of the coating layer on both sides. The heat exchanger according to any one of claims 1 to 6, which is arranged so as to be immersed inside the edge. Claims 1 to 7 include a joint member having a pipe portion arranged in a penetrating state at an entrance / exit provided in the exterior body and a mounting portion connected to the pipe portion and housed inside the exterior body. The heat exchanger according to any one of the above. The heat exchanger according to claim 8, wherein at least the skin portion of the mounting portion of the joint member is made of a heat-sealing resin of the same type as the sealant layer of the exterior body.

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