JP2022043445A - Manufacturing method of heat exchanger - Google Patents

Abstract

To provide a manufacturing method of a heat exchanger capable of performing a plurality of fusion processes respectively under proper conditions.SOLUTION: This manufacturing method of a heat exchanger is provided to manufacture a heat exchanger in which an interior part having a resin thermal fusion layer on at least an outer surface, is housed inside of an outer package body 1 composed of an outer package laminate material L1 having a thermal fusion layer 52 at an inner surface side of a heat transfer layer 51. The method includes an outer package body fusion process for thermally fusing the outer package laminate materials L1 to each other at an outer peripheral edge portion of the outer package body 1, and an interior part fusion process for thermally fusing the interior part to the outer package body 1. After the outer package body fusion process, the interior part fusion process is performed, and the outer package body fusion process is performed in a state that at least one of a fusion temperature, a fusion pressure and a fusion time as fusion conditions, is increased with respect to that in the interior part fusion process.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for manufacturing a heat exchanger manufactured by using a laminated material in which a heat fusion layer made of resin is laminated on a heat transfer layer made of metal.

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 the electronic devices. Depending on the model, a water-cooled cooler or heat pipe may be incorporated to load the heat on the electronic components such as the CPU. Conventionally, there have been proposed techniques for avoiding the adverse effects of heat by preventing heat from being trapped inside the housing.

In addition, battery modules mounted on electric vehicles and hybrid vehicles generate a large amount of heat in the battery pack because they are repeatedly charged and discharged. Therefore, in the battery module as well as the above-mentioned electronic device, a technique has been proposed in which a water-cooled cooler and a heat pipe are incorporated to avoid adverse effects due to heat.

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

Conventionally, thin coolers such as heat pipes incorporated in small electronic devices have been mainly made of metal by joining a plurality of metal components by brazing or the like (Patent Documents 1 to 3).

Such a metal cooler is thinner than the current one because each component is manufactured by plastic working such as casting and forging, and troublesome metal processing (machining) such as removal processing such as cutting. It is difficult.

Therefore, a cooler in which an outer package as a casing and an inner fin (inner core material) are made of a laminated material has been proposed. The laminated material is formed by laminating a resin-made heat-sealing layer on a metal foil layer. Then, for example, the laminating material for the outer capsule (the outer packaging laminating material) is laminated up and down via the laminating material (inner fin) for the inner core material, and the outer peripheral edges of the outer peripheral laminating material are heat-sealed to each other. While the outer capsule is formed, the intermediate region of the upper and lower outer capsule laminating materials is heat-sealed to the uneven portion of the inner fin, and the inner fin is fixed in the outer capsule.

This laminated material cooler does not require troublesome metal processing, and has been attracting attention in recent years because it can be easily manufactured, reduced in cost, and made thinner.

JP-A-2015-56993 JP-A-2015-141002 Japanese Unexamined Patent Publication No. 2016-189415

When manufacturing a cooler made of the above-mentioned laminated material, as described above, the outer capsule fusion step of heat-sealing the outer capsule laminate materials and the fin fusion step of heat-sealing the outer capsule laminate materials and the inner fins are performed. implement. However, the outer capsule fusion step is to seal the outer peripheral edges of the outer capsule laminating material by sandwiching them with hot plates from both the upper and lower sides and fusing them, whereas the fin fusion step is the outer surface of the outer capsule. The inner fin is fixed to the outer capsule by pressing the hot plate from the surface and fusing it. In this way, the outer capsule fusion process applies heat from both sides to seal, whereas the fin fusion process applies heat from one side to fix the fins, and the type of fusion is different. Since they are different, the fusion conditions such as fusion temperature (seal temperature), fusion time (seal time), and fusion pressure (seal pressure) are also different. That is, when manufacturing a cooler made of a laminated material, it is necessary to carry out a plurality of fusion steps having different fusion conditions.

Under such circumstances, in the technical field of laminated material coolers, it is eager to develop a technology that can appropriately perform a plurality of fusion processes with different fusion conditions when manufacturing a cooler. The current situation is that it has been done.

The present invention has been made in view of the above problems, and when performing a plurality of fusion steps having different fusion conditions, each fusion step can be performed under appropriate conditions, and there is no fusion defect. It is an object of the present invention to provide a method for manufacturing a heat exchanger capable of manufacturing a high quality heat exchanger.

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

[1] A resin heat fusion layer is provided at least on the outer surface inside an outer package made of an outer capsule laminate material in which a resin heat fusion layer is provided on the inner surface side of a metal heat transfer layer. It is a method of manufacturing a heat exchanger for manufacturing a heat exchanger in which the interior parts are housed.
An external capsule fusion step of heat-sealing the external capsule laminating materials to each other at the outer peripheral edge of the external capsule,
Including an interior product fusion step of heat-sealing the interior product to the external capsule.
After performing the outer package fusion step, the interior product fusion step is performed, while the interior product fusion step is performed.
In the outer package fusion step, at least one of the fusion temperature, the fusion pressure, and the fusion time as the fusion conditions is increased for the interior product fusion step. A characteristic method for manufacturing a heat exchanger.

[2] The interior product is made of an inner core laminated material in which resin heat transfer layers are provided on both sides of a metal heat transfer layer, and includes inner fins having uneven portions.
The method for manufacturing a heat exchanger according to item 1 above, wherein the interior product fusion step includes a fin fusion step of heat-sealing the uneven portion of the inner fin to the outer package.

[3] The interior product includes a header made of a heat-fused resin, which is provided corresponding to an entrance / exit provided in the outer package and for moving a heat exchange medium in and out of the outer package.
The method for manufacturing a heat exchanger according to claim 2, wherein the interior product fusion step includes a header fusion step of heat-sealing the header to the external capsule.

[4] The method for manufacturing a heat exchanger according to item 3 above, wherein the fin fusion step and the header fusion step are performed at the same time.

[5] The method for manufacturing a heat exchanger according to item 3 above, wherein one of the fin fusion step and the header fusion step is performed, and then the other fusion step is performed.

[6] While the fusion temperature in the interior product fusion process is set to 165 ° C to 185 ° C,
Any of the above items 1 to 5 in which the fusion temperature of the outer package fusion step is set to 170 ° C to 200 ° C and the fusion temperature of the interior product fusion step is set to 5 ° C to 15 ° C higher. The method for manufacturing a heat exchanger according to item 1.

[7] While the fusion pressure in the interior product fusion process is set to 0.15 MPa to 0.35 MPa,
The fusion pressure in the packaging fusion step is set to 0.2 MPa to 0.5 MPa, and 0.05 MPa to 0.15 MPa higher than the fusion pressure in the interior product fusion step. The method for manufacturing a heat exchanger according to any one of 6 to 6.

[8] While setting the fusion time of the interior product fusion process to 2 to 7 seconds,
Any of the above items 1 to 7 in which the fusion time of the outer package fusion step is set to 4 seconds to 10 seconds and the fusion time of the interior product fusion step is set to be 2 seconds to 3 seconds longer. The method for manufacturing a heat exchanger according to item 1.

According to the method for manufacturing the heat exchanger of the inventions [1] to [3], different types of fusion between the outer package fusion step and the interior product fusion step (fin fusion step, header fusion step, etc.) Since the processes are performed separately, each fusion process can be performed under appropriate fusion conditions for each type, the desired fusion treatment can be reliably performed, and the sealing performance is deteriorated and the adhesion is insufficient. It is possible to reliably prevent fusion defects such as, etc., and to manufacture high-quality heat exchangers. Further, in the present invention, since the outer package fusion step is performed first, even if the height of the uneven portion of the inner fin or the like varies or the fusion surface of the header has a recess due to a sink mark, the outer package By performing the body fusion process, the outer package is surely adhered to the uneven portion of the inner fin and the fusion surface of the header, and in the adhered state, the interior product fusion process such as the fin fusion process and the header fusion process is performed. And the interior parts can be reliably fused to the outer package. In particular, in the present invention, since the fusion temperature, fusion pressure, and fusion time in the outer package fusion step are increased as compared with the interior product fusion step, the outer package fusion step can be performed with high accuracy. It is possible to ensure good sealing performance. Further, in the interior product fusion process, since the fusion conditions can be appropriately relaxed, it is possible to prevent inadvertent thinning of the heat fusion layer due to excessive melting of the heat fusion resin, and effectively prevent deterioration of adhesiveness and corrosion resistance. Furthermore, it is possible to prevent damage to the interior parts during bonding.

According to the method for manufacturing a heat exchanger of the present invention [4], since the fin fusion step and the header fusion step are performed at the same time, the fusion treatment can be efficiently performed, and the heat exchanger can be efficiently performed. Can be manufactured.

According to the method for manufacturing the heat exchanger of the present invention [5], the fin fusion process and the header fusion process are performed separately, so that the fusion conditions are set in more detail according to each fusion process. It is possible to secure better fusion property and to manufacture a heat exchanger of higher quality. In particular, when a large size inner fin is used, by performing the fin fusion process individually, the entire area of the inner fin can be fused evenly and evenly, and even better fusion properties can be achieved. It is possible to secure and manufacture a heat exchanger of even higher quality.

According to the methods for manufacturing heat exchangers of the inventions [6] to [8], the fusion conditions are specifically specified, so that the above effects can be obtained even more reliably.

FIG. 1 is a perspective view showing a heat exchanger of an embodiment that can be manufactured by the manufacturing method of the present invention. 2A and 2B are views showing the heat exchanger of the embodiment, FIG. 2A is a plan view, FIG. 2B is a side sectional view corresponding to the cross section taken along the line BB of FIG. Is a front sectional view corresponding to the CC line cross section of FIG. FIG. 3 is a perspective view showing the heat exchanger of the embodiment in an exploded manner. FIG. 4 is a front sectional view for explaining an outer package and an inner fin applied to the heat exchanger of the embodiment. FIG. 5 is a front sectional view for explaining the inner fin of the embodiment. FIG. 6A is a schematic cross-sectional view for explaining an external capsule fusion die capable of carrying out the external capsule fusion step in the manufacturing method of the present invention. FIG. 6B is a schematic cross-sectional view for explaining a fin fusion die capable of carrying out the fin fusion step in the manufacturing method of the present invention. FIG. 6C is a schematic cross-sectional view for explaining a header fusion die capable of carrying out the header fusion step in the manufacturing method of the present invention. FIG. 6D is a schematic cross-sectional view illustrating a fin / header fusion die capable of carrying out the fin / header fusion step in the manufacturing method of the present invention. FIG. 7A is a plan view of a heat exchanger for explaining a region fused by the outer capsule fusion step in the manufacturing method of the present invention. FIG. 7B is a plan view of a heat exchanger for explaining a region fused by the fin fusion step. FIG. 7C is a plan view of a heat exchanger for explaining the region fused by the header fusion step. FIG. 7D is a plan view of a heat exchanger for explaining the region fused by the fin / header fusion process. FIG. 8 is a plan view showing a tray member adopted in the heat exchanger of the embodiment related to the present invention. FIG. 9 is a cross-sectional view of an end portion of the tray member of the embodiment. FIG. 10 is a schematic cross-sectional view for explaining a batch fusion die capable of performing a batch fusion step when manufacturing a heat exchanger.

1 to 3 are views showing a heat exchanger according to an embodiment of the present invention. In the following description, in order to facilitate the understanding of the invention, the left-right direction of FIG. 2A is described as the “front-back direction”, and the vertical direction of FIG. 2B is referred to as the “vertical direction (thickness direction)”. It is explained as.

As shown in FIGS. 1 to 3, the heat exchanger of the present embodiment is used as a heat transfer panel, a heat transfer tube, or the like, and has an outer package 1 as a casing (container) and the inside of the outer package 1. It is provided with an inner fin (inner core material) 2 housed in the outer body 1 and a pair (both sides) of headers (joint members) 3 and 3 housed in both ends of the outer package 1.

The outer capsule 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.

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

Further, the cover member 15 is formed with a pair of entrances 16 and 16 corresponding to both front and rear ends of the recessed portion 11 in the tray member 10. Needless to say, in the present embodiment, of the pair of entrances and exits 16, one entrance / exit 16 is configured as an entrance and the other entrance / exit 16 is configured as an exit.

The tray member 10 and the cover member 15 are made of an outer packaging laminated material L1 which is a laminated sheet or film having flexibility and flexibility.

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

As the heat transfer layer 51 in the outer packaging laminate material L1, a copper foil, an aluminum foil, a stainless steel foil, a nickel foil, a nickel-plated copper foil, a clad metal composed of nickel and a copper foil, or the like can be preferably used. Aluminum foil can be preferably used. In the present embodiment, the terms "copper", "aluminum", "nickel", and "titanium" are used in the sense of including their alloys.

The heat transfer layer 51 is also referred to as a heat collecting layer, and it is preferable to use a heat transfer layer 51 having a thickness of 30 μm to 200 μm, and more preferably a heat transfer layer 51 having a thickness of 40 μm to 180 μm. That is, if the thickness of the heat transfer layer 51 is too thin, it is likely to be deformed with respect to external pressure, and the strength may decrease, which is not preferable. On the contrary, if the thickness of the heat transfer layer 51 is too thick, the flexibility may be lowered and the molding processability may be lowered, which is not preferable.

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

As the heat-sealing layer 52, a film or sheet made of a polyolefin resin such as polyethylene or polypropylene or a modified resin thereof, a fluororesin, a polyester resin, a vinyl chloride resin or the like can be preferably used. More preferably, unstretched polypropylene (CPP) is used. More preferably, polypropylene multilayer films having different melting points are used.

As the heat-sealing layer 52, it is preferable to use one having a thickness of 20 μm to 500 μm. It is more preferable to use one having a thickness of 30 μm to 80 μm.

For example, as the heat-sealing layer 52, an unstretched polypropylene (CPP) film having a thickness of 30 μm to 80 μm, which is composed of a co-pressed film having three layers (random PP / block PP / random PP), can be preferably used.

As the protective layer 53, a film or sheet such as a stretched polyester resin (PET, PBT, etc.) or a stretched polyamide resin (ONY) having a melting point of 10 ° C. or higher, more preferably 20 ° C. or higher with respect to the heat-sealed layer 52 is preferably used. Can be used.

Further, as the protective layer 53, it is preferable to use one having a thickness of 6 μm to 100 μm.

The adhesive for adhering between the heat transfer layer 51, the heat fusion layer 52, and the protective layer 53 constituting the outer packaging laminate L1 is a urethane adhesive or an epoxy adhesive having a thickness of 1 μm to 5 μm. , Olefin-based adhesives and the like can be preferably used.

In the present embodiment, a sheet having a three-layer structure is used as the laminating material L1 constituting the outer package 1, but the present invention is not limited to this, and in the present invention, the heat transfer layer and the heat fusion layer are used. A sheet having a two-layer structure may be used, or a sheet having a structure of four or more layers may be used. When a sheet having a structure of four or more layers is used, for example, another layer is interposed between the protective layer and the heat transfer layer, or another layer is interposed between the heat transfer layer and the heat transfer layer. Alternatively, it may be configured into four or more layers.

The outer packaging laminate material L1 having the above configuration constitutes the tray member 10 and the cover member 15 of the outer packaging body 1. Then, by the external capsule fusion step (external capsule fusion treatment) described later, the cover member 15 is attached to the tray member 10 so as to close the opening of the recess 11 to form the external capsule 1. ..

In the present embodiment, the bottom wall (lower wall) 111 of the recessed portion 11 in the tray member 10 and the top wall (upper wall) 151 of the portion corresponding to the recessed portion 11 in the cover member 15 attached to the tray member 10. As a result, a pair of facing walls 111 and 151 are configured.

As shown in FIGS. 1 to 4, the inner fins 2 housed in the hollow portion (recessed portion) 11 of the outer capsule 1 are made of an inner core laminating material L2 which is a flexible or flexible laminated sheet or film. It is configured.

As shown in FIG. 4, the inner core laminating material L2 is a heat transfer layer 61 made of metal foil and a heat fusion layer made of a resin film or resin laminated on both sides of the heat transfer layer 61 via an adhesive. It has 62 and 62.

The heat transfer layer 61 in the inner core laminate material L2 is composed of copper foil, aluminum foil, stainless steel foil, nickel foil, nickel-plated copper foil, nickel and copper foil, similarly to the heat transfer layer 51 of the outer packaging laminate material L1. Clad metal and the like can be preferably used, and aluminum foil can be particularly preferably used.

The heat transfer layer 61 preferably has a thickness of 30 μm to 200 μm, and more preferably 40 μm to 180 μm. That is, if the thickness of the heat transfer layer 61 is too thin, it is likely to be deformed with respect to external pressure, and the strength may decrease, which is not preferable. On the contrary, if the thickness of the heat transfer layer 61 is too thick, the flexibility may be lowered and the molding processability may be lowered, which is not preferable.

The heat-sealed layer 62 is made of a polyolefin-based resin such as polyethylene or polypropylene, a modified resin thereof, a fluororesin, a polyester-based resin, a vinyl chloride resin, or the like, similarly to the heat-sealed layer 52 of the outer packaging laminate L1. The film or sheet to be formed can be preferably used. Above all, it is preferable to use unstretched polypropylene (CPP). More preferably, polypropylene multilayer films having different melting points are preferably used.

As the heat-sealing layer 62, a layer having a thickness of 20 μm to 500 μm is preferable, and a layer having a thickness of 30 μm to 80 μm is more preferable.

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

The processing method of the inner fin 2 is not particularly limited, but for example, the inner core laminating material L2 is sandwiched between a pair of embossed rolls or a pair of corrugated rolls and passed between the pair of rolls to cause unevenness. Can be exemplified as a method of molding. Further, a method of forming an uneven portion on the inner core laminating material L2 by using a press machine or a press die can be exemplified.

As shown in FIGS. 2 to 5, the inner fin 2 is formed in a square wave shape (rectangular wave shape) in which concave portions 25 and convex portions 26 are alternately and continuously formed, that is, a so-called digital signal waveform. That is, the concave bottom surface (bottom wall) and the convex top surface (top wall) of the inner fin 2 of the present embodiment are formed flat, and the bottom wall (lower wall) of the tray member 10 is in the heat exchanger assembled state. It is arranged parallel to the top wall (upper wall) 151 of 111 and the cover member 15. Further, in the inner fin 2, the rising wall connecting the adjacent concave bottom wall and the convex top wall is the upper and lower walls 111 of the outer package 1 with respect to the concave bottom wall and the convex top wall or in the heat exchanger assembled state. , 151 is arranged perpendicular to.

In the present embodiment, the inner fin 2 having a square wave shape is used, but the present invention is not limited to this, and in the present invention, a general wave shape in which concave portions and protrusions having an arcuate cross section are alternately and continuously formed. (Sine and cosine shape), that is, a so-called analog signal waveform may be used. However, in the present invention, the inner fin can be of any shape as long as it is provided with a concave portion and a convex portion to be joined to the inner peripheral surface of the outer capsule.

The inner fin 2 is housed in the recessed portion 11 of the tray member 10. In this case, the inner fin 2 is housed in the intermediate portion of the tray member 10 except for the front and rear ends of the recessed portion 11. Further, the inner fin 2 is arranged so that the mountain line direction and the valley line direction coincide with the front-rear direction (left-right direction in FIG. 1) of the tray member 10. As a result, the tunnel portion and the groove portion formed by the mountain streaks and the valley streaks of the inner fin 2 are configured as heat exchange channels. A plurality of heat exchange channels are arranged along the front-rear direction (length direction) of the tray member 10 and in parallel in the width direction (left-right direction), and each heat exchange medium (heat medium) is arranged in parallel. It is configured so that the outer package 1 can smoothly flow from one end side to the other end side in the front-rear direction while being evenly dispersed through the heat exchange flow path.

On the other hand, as shown in FIGS. 2 and 3, the pair of headers 3 and 3 arranged at both ends of the outer package 1 are made of a molded product of a heat-sealing resin. In the present invention, it is sufficient that a resin heat-sealing layer is provided on at least the outer surface of the interior product such as a header.

Further, as the resin constituting the header 3, it is preferable to use a resin of the same type as the resin constituting the heat fusion layers 52 and 62 of the outer capsule 1 and the inner fin 2. Specifically, polyolefin resins such as polyethylene and polypropylene, modified resins thereof, fluororesins, polyester resins, vinyl chloride resins and the like can be preferably used.

The header 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 wall of the mounting box portion 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.

The molding method of the header 3 is not particularly limited, but for example, a method of molding by injection molding can be preferably adopted.

The mounting box portion 31 of the header 3 is arranged on both sides of the inner fin 2 in the recessed portion 11 of the tray member 10. Further, the pipe portion 33 of the header 3 is arranged upward, and the opening portion 32 of the mounting box portion 31 is arranged toward the inside, that is, facing the inner fin 2.

In this way, the headers 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 headers 3 and 3 are inserted and arranged in the doorway 16 of the cover member 15.

By heating the temporarily assembled heat exchanger temporary assembly, the required portions of the members in contact with each other are heat-sealed and joined and integrated. This heat fusion is an outer package fusion step of heat-sealing (sealing) between the flange portion 12 of the tray member 10 and the outer peripheral edge portion of the cover member 15 via the corresponding heat fusion layer 52. (Outer package sealing step), a pair of facing walls 111, 151, and fins that are heat-sealed (sealed) between the uneven portions 25, 26 of the inner fin 2 via the corresponding heat-sealing layers 52, 62. 3 of a fusion step (fin seal step) and a header fusion step (header seal step) of heat fusion (sealing) between the heat fusion layer 52 of the pair of facing walls 111 and 151 and the header 3. It involves two heat fusion steps.

Here, in the present embodiment, the interior product is composed of either one or both of the inner fin 2 and the header 3. Further, the interior product fusion process is composed of either one or both of the fin fusion process and the header fusion process.

In the present embodiment, after the outer package fusion step is performed, the interior product fusion step is performed. Further, in the interior product fusion step, the fin fusion step may be performed first, and then the header fusion step may be performed, or the header fusion step may be performed first, and then the fin fusion step may be performed. Alternatively, the fin fusion step and the header fusion step may be performed at the same time.

In the present embodiment, the case where the fin fusion step and the header fusion step are simultaneously performed after the outer capsule fusion step is referred to as a two-stage seal, and after the outer capsule fusion step is performed, the fin fusion step is performed. The case where one of the header fusion steps is performed and then the other is performed is called a three-stage seal.

Further, in the present embodiment, the first fusion step (encapsule fusion step) is referred to as the first (first step) sealing, and the second fusion step (fin fusion step and / or header) is performed. The fusion step) is referred to as the second (second step) seal, and the third fusion step (fin fusion step or header fusion step) is referred to as the third (third step) seal. ..

FIG. 6A is a schematic cross-sectional view for explaining the external capsule fusion die D1 for carrying out the external capsule fusion process. As shown in the figure, the lower mold of the mold D1 is provided with a hot plate portion P1 that supports the flange portion 12 of the tray member 10 of the heat exchanger temporary assembly installed in the mold from below. At the same time, the upper mold is provided with a hot plate portion P1 that presses the outer peripheral edge portion of the cover member 15 from above. Then, the mold is closed, the overlapped portion between the flange portion 12 of the tray member 10 and the outer peripheral edge portion of the cover member 15 is sandwiched between the upper and lower hot plate portions P1 to pressurize, and in that state, via the heater H1. By heating, as shown by the diagonal hatching in FIG. 7A, the flange portion 12 of the tray member 10 and the outer peripheral edge portion of the cover member 15 can be heat-sealed and sealed.

FIG. 6B is a schematic cross-sectional view for explaining the fin fusion die D2 for carrying out the fin fusion step. As shown in the figure, the lower mold of the mold D2 has a portion corresponding to the inner fin 2 in the bottom wall (opposing wall) 111 of the tray member 10 of the heat exchanger temporary assembly installed in the mold. A hot plate portion P2 that supports from the lower side is provided, and the upper mold is provided with a hot plate portion P2 that presses the portion of the facing wall 151 of the cover member 15 corresponding to the inner fin 2 from above. Then, the mold is closed, the upper and lower hot plate portions P2 are pressed against the central region of the bottom surface of the tray member 10 and the central region of the upper surface of the cover 15 to pressurize, and in that state, the heat plate portions P2 are heated via the heater H2 in FIG. 7B. As shown by the diagonal hatching, the pair of facing walls 111 and 151 and the uneven portions 25 and 26 of the inner fin 2 can be heat-sealed and fixed.

FIG. 6C is a schematic cross-sectional view for explaining the header fusion die D3 that carries out the header fusion step. As shown in the figure, the lower mold of the mold D3 corresponds to the headers 3 at both ends of the bottom wall (opposing wall) 111 of the tray member 10 of the heat exchanger temporary assembly installed in the mold. A hot plate portion P3 that supports the portion from below is provided, and the upper mold presses the portion of the header 3 at both ends of the facing wall 151 of the cover member 15 except for the pipe portion 33 from above. A portion P3 is provided. Then, the mold is closed, the upper and lower hot plate portions P3 are pressed against both ends of the bottom surface of the tray member 10 and both ends of the upper surface of the cover 15 to pressurize, and in that state, the heat plate portions P3 are heated via the heater H3 in FIG. 7C. As shown by the diagonal hatching, the pair of facing walls 111 and 151 and the upper and lower surfaces of the mounting box portion 31 of the header 3 can be heat-sealed and fixed.

FIG. 6D is a schematic cross-sectional view for explaining a fin / header fusion die D4 in which a fin fusion step and a header fusion step are simultaneously performed. As shown in the figure, the lower mold of the mold D4 has a hot plate portion that supports the bottom wall (opposing wall) 111 of the tray member 10 of the heat exchanger temporary assembly installed in the mold from below. In addition to being provided with P4, the upper mold is provided with a hot plate portion P4 that presses the central region of the facing wall 151 of the cover member 15 from above. Then, the mold is closed, the upper and lower hot plate portions P4 are pressed against the bottom surface of the tray member 10 and the center region of the upper surface of the cover member 15 to pressurize the mold, and in that state, the heat plate portions P4 are heated via the heater H4 in FIG. 7D. As shown by diagonal hatching, the pair of facing walls 111 and 151 and the inner fin 2 and the header 3 can be heat-sealed and fixed.

Although not directly related to the present invention, for reference, the batch fusion die D10 that simultaneously performs the outer package fusion step, the fin fusion step, and the header fusion step will be described as shown in FIG. The lower mold of the mold D10 is provided with a hot plate portion P10 that supports the bottom wall 111 and the flange portion 12 of the tray member 10 of the heat exchanger temporary assembly installed in the mold from below. The upper mold is provided with a heat plate portion P10 that presses the entire area of the cover member 15 from above. Then, the mold is closed, and the upper and lower hot plate portions P10 are pressed against the entire bottom surface of the tray member 10 and the upper surface of the cover 15 to pressurize, and in that state, the outer package is heated via a heater (not shown). The fusion process, the fin fusion process, and the header fusion process can be performed at the same time.

In the present embodiment, the tray member 10, the cover member 15, the inner fin 2 and the header 3 are subjected to the above-mentioned outer package fusion step, fin fusion step, and header fusion step for the heat exchanger temporary assembly. The required contact parts of the above are joined and integrated by heat fusion (heat adhesion), and the heat exchanger is assembled.

In the present embodiment, by performing the heat fusion step (heat treatment) under reduced pressure, the inner fin 2 between the tray member 10 and the cover member 15 and the tray member 10 and the cover member 15 in contact with them. The heat bonding can be strongly performed in a state where the adhesion between the headers 3 and 3 is high, and the bonding area can be widened. Therefore, it is preferable to perform the heat fusion treatment under reduced pressure.

In the present embodiment, the fusion temperature (seal temperature) is preferably set to 165 ° C to 200 ° C, more preferably 170 ° C to 190 ° C. Further, the fusion pressure (seal pressure) is preferably set to 0.15 MPa to 0.5 MPa, more preferably 0.2 MPa to 0.3 MPa. Further, the fusion time (seal time) is preferably set to 2 seconds to 10 seconds, more preferably 3 seconds to 7 seconds.

Here, in the present embodiment, the external capsule fusion step and the interior product fusion step such as the fin fusion step and the header fusion step are fusion conditions such as fusion temperature, fusion pressure, and fusion time. (Seal conditions) are different, and it is preferable to appropriately set the fusion conditions for each fusion process.

That is, in the present embodiment, it is preferable to set the fusion temperature of the outer package fusion step to 170 ° C to 200 ° C and to be 5 ° C to 15 ° C higher than the fusion temperature of the interior product fusion step. Further, it is preferable to set the fusion temperature in the interior product fusion step to 165 ° C to 185 ° C.

Further, it is preferable to set the fusion pressure in the outer package fusion step to 0.2 MPa to 0.5 MPa and set 0.05 MPa to 0.15 MPa higher than the fusion pressure in the interior product fusion step. Further, it is preferable to set the fusion pressure in the interior product fusion step to 0.15 MPa to 0.35 MPa.

Further, it is preferable to set the fusion time of the fusion process to 4 seconds to 10 seconds and set it to be 2 seconds to 3 seconds longer than the fusion time of the interior product fusion process. Further, it is preferable to set the fusion time of the interior product fusion process to 2 seconds to 7 seconds.

In the present embodiment, if such fusion conditions are satisfied, the fusion treatment can be performed accurately and accurately in each fusion step, and the occurrence of fusion defects such as peeling and liquid leakage can be ensured. It is possible to efficiently manufacture a high-quality heat exchanger that can be prevented.

The heat exchanger having the above configuration is used as a cooler (cooling device) for cooling the 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 (coolant) 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 a cooling target member is placed in contact with the lower wall 111 and / or the upper wall 151 of the outer package 1 of the heat exchanger. Then, in that state, the cooling liquid flows from one pipe portion 33 into the inside of the outer package 1 through the one header 3, the cooling liquid is circulated through the inner fin 2 portion, and the cooling liquid is circulated through the other header 3. It is discharged from the other pipe portion 33. By circulating the coolant to the outer package 1 in this way, heat is exchanged between the coolant and the battery via the inner fins 2 and the upper and lower walls of the outer package 1, and the battery is cooled.

The form of use of the heat exchanger of the present embodiment is not particularly limited, and the heat exchanger may be used alone or in combination of two or more. As described above, the single use is to bring the heat exchange target member into contact with the upper and lower surfaces of the heat exchanger. When two are used, for example, the heat exchange target member can be arranged and used so as to be sandwiched between two heat exchangers. Further, when two or more are used, the heat exchanger and the heat exchange target member may be arranged so as to be alternately overlapped with each other.

As described above, according to the heat exchanger of the present embodiment, different types of fusion processes, such as the outer capsule fusion process and the interior product fusion process such as the fin fusion process and the header fusion process, are performed separately. Therefore, various fusion steps can be performed under appropriate fusion conditions for each type. Therefore, the desired fusion treatment can be reliably performed, fusion defects such as deterioration of sealing property and insufficient adhesion can be reliably prevented, liquid leakage and peeling can be reliably prevented, and high-quality heat exchange can be performed. You can make a vessel.

Further, in the present embodiment, since the outer capsule fusion step is performed first, the heights of the uneven portions 25 and 26 of the inner fin 2 may vary, and the upper and lower surfaces of the mounting box portion 31 of the header 3 may be scratched. Even if there is a recess due to the above, the pair of facing walls 111 and 151 of the outer capsule 1 is formed by the uneven portions 25 and 26 of the inner fin 2 and the mounting box portion 31 of the header 3 by performing the outer capsule fusion step first. It will surely adhere to the upper and lower surfaces. Therefore, in this close contact state, since the second and subsequent seals, that is, the fin fusion step and the header fusion step are performed, the inner fins 2 and the header 3 are surely melted by the facing walls 111 and 151 of the outer package 1. It can be worn, the mounting strength can be further improved, and defects such as peeling can be prevented more reliably.

In particular, in the present embodiment, in the outer capsule fusion step, it is necessary to fuse and seal the entire outer peripheral edge portion of the outer capsule 1 without gaps, so that a high amount of heat is required. Since the sealing temperature, sealing pressure, and sealing time in the bonding process are increased as compared with the fin fusion process and the header fusion process, the desired fusion process can be performed more reliably, and good sealing performance can be performed. Can be secured, and liquid leakage and the like can be prevented even more reliably.

On the contrary, in the interior product fusion process such as the fin fusion process and the header fusion process, the fusion conditions can be appropriately relaxed as necessary, so that problems such as excessive melting of the heat fusion resin can be prevented. That is, when the inner fin 2 and the header 3 are fused to the outer package 1, the fusion conditions are set according to the material, shape, uneven portion level of the inner fin 2, the material, shape of the header 3, and the sink level of the resin. Need to be set. Therefore, by relaxing the fusion conditions in the interior product fusion process as compared with the outer package fusion process, it is possible to prevent the occurrence of heat wrinkles (shrinkage wrinkles) in the outer package 1 after heat fusion, and the heat fusion resin. It is possible to prevent inadvertent thinning of the heat-sealed layer due to excessive melting, and it is possible to effectively prevent deterioration of adhesiveness and corrosion resistance.

Further, in the present embodiment, when the fin fusion process and the header fusion process of the interior product fusion process are performed separately, the fusion conditions can be set in more detail according to each fusion process. It is possible to secure better fusion property and to manufacture a heat exchanger of higher quality. In particular, when the inner fin 2 has a large size such as length and width, the entire area of the inner fin 2 can be fused evenly and evenly by individually performing the fin fusion process. Even better fusion properties can be ensured, and higher quality heat exchangers can be manufactured.

On the other hand, when the fin fusion process and the header fusion process are performed at the same time, the fusion process can be performed more efficiently and the production efficiency of the heat exchanger can be improved as compared with the case where the fin fusion process and the header fusion process are performed separately. can.

Further, in the present embodiment, since the square wave-shaped inner fin 2 is used, the concave bottom wall and the convex top wall become flat, and the contact area of the outer capsule 1 with the pair of facing walls 111 and 151 is increased. be able to. Therefore, the heat transfer property between the inner fin 2 and the outer package 1 can be further improved, and the heat exchange performance can be further improved. Further, since a large contact area between the inner fin 2 and the outer package 1 can be secured, the mounting strength of the inner fin 2 to the outer package 1 can be improved, and the occurrence of poor contact can be prevented more reliably.

Further, in the present embodiment, since the inner fin 2 is formed in a square wave shape, the rising wall connecting between the concave bottom wall and the convex top wall is the facing upper and lower walls 111 and 151 of the outer package 1. Many are arranged in a state orthogonal to each other. Therefore, the inner fin 2 can fully exert its function as a reinforcing member, for example, it acts to stretch against the stress in the compression direction due to the external pressure, and acts to pull against the stress in the expansion direction due to the internal pressure. It is possible to secure high strength against both internal pressure and external pressure, prevent deformation, reliably maintain a stable shape, and further improve operation reliability. In particular, when a plurality of heat exchangers are stacked and used, sufficient pressure resistance can be ensured, a stable form (shape) can be reliably maintained, and high heat exchange performance can be reliably obtained. Furthermore, since sufficient pressure resistance can be ensured, it is not necessary to separately provide a reinforcing member, and the number of parts can be omitted by that amount, so that the structure can be simplified and the cost can be reduced.

In the above embodiment, the cover member 15 of the outer package 1 is in the form of an unmolded sheet, but the present invention is not limited to this, and in the present invention, the cover member 15 is molded. May be. For example, the cover member is formed of a hat-shaped molded product having a cross-section in which the central portion is recessed upward, and the hat-shaped cover member is externally covered with the tray-shaped tray member 10 as described above from above. The peripheral portions may be joined and integrated to form an outer package. Further, in the present invention, the outer packaging body may be formed by superimposing two unmolded sheet-shaped outer capsule laminating materials L1 and heat-sealing the outer peripheral peripheral portion thereof.

Further, in the above embodiment, the case where the outer capsule 1 is formed by laminating two outer capsule laminate materials L1 has been described as an example, but the present invention is not limited to this, and in the present invention, the outer capsule laminate that forms the outer capsule is formed. The number of materials is not limited, and for example, one outer capsule laminate material may be folded in half to form an outer capsule, or three or more outer capsule laminate materials may be bonded together to form an outer capsule.

<Preparation of heat exchanger (temporary assembly)>
(1) Preparation of Outer Package Laminate Material L1 As shown in Table 1, an aluminum foil having a thickness of 120 μm was prepared as a metal foil for the heat transfer layer 51 of the outer package laminate material (outer package material) L1 of Example 1. This aluminum foil is used as a heat transfer layer 51, and three layers with a thickness of 40 μm (random PP / block PP / random PP: layer ratio of each layer is 1/8/1) via a urethane adhesive on one surface (inner surface) thereof. A 12 μm-thick polyethylene terephthalate (PET) film is attached to the other surface (outer surface) of the heat transfer layer (aluminum foil) via a urethane-based adhesive, and the outer package is attached. Laminate material L1 was produced.

(2) Preparation of Inner Core Laminate Material L2 As shown in Table 1, the same aluminum foil as above is prepared as the metal foil for the heat transfer layer 61 of the inner core laminate material (inner core material) L2 of Example 1. did. This aluminum foil is used as a heat transfer layer 61, and three layers (random PP / block PP / random PP: layer ratio 1/8/1 of each layer) having a thickness of 40 μm are not stretched on both sides thereof via a urethane adhesive. The co-pressing film of No. 1 was laminated to prepare an inner core laminating material L2.

(3) Fabrication of Tray Member 10 and Cover Member 15 A sheet material obtained by cutting the outer capsule laminating material L1 is deep-drawn using a press die in accordance with the embodiments shown in FIGS. 1 to 3. By molding, as shown in FIGS. 8 and 9, a recess 11 having a width (Wr) of 90 mm × a length (Lr) of 140 mm × a depth (Dr) of 4 mm is formed around the entire circumference of the opening edge of the recess 11. A tray member 11 having a flange portion 12 having a width (Wf) of 10 mm was produced.

In this embodiment, the tray member 10 processed into a sharp shape was manufactured in order to obtain high dimensional accuracy. Specifically, the radius of the four corners (R1) in the recess 11 is 2.0 mm, the radius of the die shoulder (R2) is 1.0 mm, the radius of the punch shoulder (R3) is 1.0 mm, and the clearance between the die and the punch is 0. It is .25 mm.

Further, the outer capsule laminated material L1 is cut to form a sheet-shaped cover member 15 having a size (110 mm × 160 mm) corresponding to the upper surface of the tray member 11, and corresponding to both sides of the recessed portion 11 of the tray member 11. A doorway 16 (see FIGS. 1 to 3) was formed.

(4) Fabrication of Inner Fin 2 As shown in FIG. 5, the inner core laminating material L2 is subjected to a fin height (Hf) of 4.1 mm, a fin pitch (Pf) of 4 mm, and a fin thickness (Tf) by a gear embossing machine. Was formed into a square wave shape of 0.2 mm, and the square wave sheet was cut into a length of 100 mm and a width of 90 mm to prepare an inner fin 2. The mountain line direction and the valley line direction of the inner fin 2 are arranged along the length direction (vertical direction). Further, in the inner fin 2, the outer corner radius (R4) is set to 0.5 mm in order to have a sharp shape as in the tray member 11.

(5) Fabrication of Header 3 As shown in FIGS. 2 and 3, by injection molding a resin material made of PP, an inner diameter of φ10 mm and an outer diameter of 10 mm are formed in a mounting box portion 31 having a height of 4 mm, a length of 90 mm, and a width of 20 mm. A header 3 in which a pipe portion 33 having a diameter of φ12 mm and a length of 3 mm was integrally formed was produced.

(6) Temporary Assembly of Heat Exchanger The heat exchanger of Example 1 was manufactured by using the outer package 1, the inner fin 2, and the header 3 manufactured in Example 1. That is, the headers 3 and 3 are housed at both ends of the recessed portion 11 of the tray member 10 so that the pipe portions 33 face upward. Further, the inner fin 2 described above was accommodated between the headers 3 and 3 in the recessed portion 11.

Next, the cover member 15 was arranged in the tray member 10 so as to close the recessed portion 11 from above. At this time, the pipe portions 33, 33 of the headers 3 and 3 were inserted through the entrances 16 and 16 of the cover member 15 and projected above the cover member 15.

As a result, a plurality of heat exchanger temporary assemblies were manufactured. The temporarily assembled product was subjected to a heat fusion treatment (sealing treatment) as described below to produce heat exchangers of Examples and Comparative Examples.

<Example 1>

As shown in Table 1, the heat exchanger temporary assembly in a non-bonded state was heat-fused with the following two-stage seal. For the first seal, the outer capsule fusion die D1 as shown in FIG. 6A is used, and the fusion temperature (seal temperature) 190 ° C. × fusion pressure (seal pressure) 0.3 MPa × fusion time (seal time). The outer package fusion step was performed under the sealing condition of 7 seconds, and the flange portion 12 of the tray member 10 and the outer peripheral edge portion of the cover member 15 were heat-sealed and sealed.

For the second sealing, the fin / header fusion die D4 as shown in FIG. 6D was used, and the fin fusion process and the header fusion were performed under the sealing conditions of a sealing temperature of 180 ° C., a sealing pressure of 0.2 MPa, and a sealing time of 6 seconds. The attachment process was performed at the same time, and the inner fin 2 and the header 3 were heat-sealed and fixed to the pair of facing walls 111 and 151 in the outer package 1. As a result, the heat exchanger of Example 1 was produced.

<Example 2>
As shown in Table 1, the heat exchanger temporary assembly in a non-bonded state was heat-fused with the following three-stage seal. The first seal was subjected to an external capsule fusion treatment in the same manner as in Example 1.

For the second sealing, the fin fusion die D2 as shown in FIG. 6B is used, and the fin fusion process is performed under the sealing conditions of a sealing temperature of 180 ° C., a sealing pressure of 0.2 MPa, and a sealing time of 6 seconds. 2 was heat-sealed to the outer package 1.

For the third sealing, the header fusion die D3 as shown in FIG. 6C is used, and the header fusion process is performed under the sealing conditions of a sealing temperature of 180 ° C., a sealing pressure of 0.25 MPa, and a sealing time of 6 seconds. Was heat-sealed to the outer package 1. As a result, the heat exchanger of Example 2 was produced.

<Example 3>
As shown in Table 1, the heat exchanger temporary assembly in a non-bonded state was heat-fused with the following three-stage seal. The first seal was subjected to an external capsule fusion treatment in the same manner as in Example 1.

For the second sealing, the header fusion die D3 as shown in FIG. 6C is used, and the header fusion process is performed under the sealing conditions of a sealing temperature of 180 ° C., a sealing pressure of 0.25 MPa, and a sealing time of 6 seconds. Was heat-sealed to the outer package 1.

For the third sealing, the fin fusion die D2 as shown in FIG. 6B is used, and the fin fusion process is performed under the sealing conditions of a sealing temperature of 180 ° C., a sealing pressure of 0.2 MPa, and a sealing time of 6 seconds. 2 was heat-sealed to the outer package 1. As a result, the heat exchanger of Example 3 was produced.

<Comparative Example 1>
As shown in Table 1, the heat exchanger temporary assembly in a non-bonded state was heat-fused with the following one-stage seal. That is, the header fusion step, the fin fusion step and the header fusion step are carried out under the sealing conditions of a sealing temperature of 190 ° C. × a sealing pressure of 0.3 MPa × a sealing time of 7 seconds using a batch fusion die D10 as shown in FIG. At the same time, the heat exchanger of Comparative Example 1 was produced.

<Comparative Example 2>
As shown in Table 1, the heat exchanger temporary assembly in a non-bonded state was heat-fused with the following two-stage seal. The first seal was subjected to an external capsule fusion treatment in the same manner as in Example 1.

For the second sealing, the fin / header fusion die D4 as shown in FIG. 6D is used, and the same sealing conditions as the first sealing conditions, that is, the sealing temperature 190 ° C. × the sealing pressure 0.3 MPa × the sealing time 7 seconds. Under the sealing conditions, the fin fusion step and the header fusion step were performed at the same time, and the inner fin 2 and the header 3 were heat-sealed to the outer package 1. As a result, the heat exchanger of Comparative Example 2 was produced.

<Comparative Example 3>
As shown in Table 1, the heat exchanger temporary assembly in a non-bonded state was heat-fused with the following three-stage seal. The first seal was subjected to an external capsule fusion treatment in the same manner as in Example 1. In the second and third times, the fin fusion step and the header fusion step were sequentially performed under the same sealing conditions as the first sealing condition to produce the heat exchanger of Comparative Example 3.

<Appearance evaluation test>
Visually observe the appearance (particularly the front and back) of each of the heat exchangers of Examples 1 to 3 and Comparative Examples 1 to 3 for the presence or absence of heat wrinkles (shrinkage wrinkles), and if wrinkles are generated, the presence or absence of heat wrinkles (shrinkage wrinkles) is observed. , The depth of wrinkles was measured using a contour shape measuring instrument (contraser "CV-2100" manufactured by Mitutoyo Co., Ltd.).

The evaluation criteria are "◎ (excellent)" for heat exchangers with no wrinkles on the front and back, and "○ (good)" for wrinkles with a depth of less than 50 μm on either the front or back. Wrinkles with a depth of 50 μm or more and less than 100 μm were evaluated as “Δ (normal)”, and wrinkles with a depth of 100 μm or more on either the front or back were evaluated as “× (defective)”. .. The results are also shown in Table 1.

<Pressure test>
Three heat exchangers (N = 3) of Examples 1 to 3 and Comparative Examples 1 to 3 were prepared, and a pressure resistance evaluation test was conducted for each heat exchanger. That is, after cooling water is circulated to each heat exchanger and held at an internal pressure of 1 MPa for 5 minutes, the presence or absence of peeling and swelling (adhesive breakage portion) between the outer package 1 and the inner fin 2 and the header 3 is checked in each heat exchanger. Observed. Furthermore, as a reference, the presence or absence of adhesive failure points was observed even when the internal pressure increased excessively to 1.5 MPa. As a result, as shown in Table 1, even when the internal pressure increased to 1.5 MPa in all the heat exchangers, there were no adhesive fracture points and the pressure resistance was excellent.

<Repeat pressure resistance test>
Five heat exchangers (N = 5) of Examples 1 to 3 and Comparative Examples 1 to 3 were prepared, tap water at room temperature (23 ° C.) was passed through each heat exchanger, and the running water pressure was 0 MPa. After 15,000 times and 20,000 times, the appearance of each heat exchanger was observed by repeatedly applying the load of 0.2 MPa and the load of 0.2 MPa alternately, and peeling and swelling occurred in any part. It was confirmed whether it occurred.

The evaluation criteria are "◎ (excellent)" for all 5 heat exchangers that are peeled off by a load of up to 20,000 times and do not swell, and up to 20,000 times for 4 out of 5 heat exchangers. "○ (good)" for one heat exchanger that does not peel off and swell due to load and does not peel off and swell up to 15,000 times, and 4 out of 5 heat exchangers 20,000 times. "△ (normal)" means that there is no peeling and swelling due to the load up to 15,000 times, and that the heat exchanger is peeled off and swelled by the load up to 15,000 times. In the heat exchanger, those that peeled off and swelled by a load of 20,000 times or 15,000 times were evaluated as "x (defective)". The results are also shown in Table 1.

<OY water corrosion test>
After passing OY water at 60 ° C. for 250 hours under the condition of 3 L / min to each of the heat exchangers of Examples 1 to 3 and Comparative Examples 1 to 3, the corrosion state of each heat exchanger was observed. ..

The composition of OY water is Cl ⁻ : 200 ppm, SO _4-2 : 60 ppm, Fe ³⁺ : 30 ppm, Cu ²⁺ : ^{1 ppm, Na + :} 120 ppm.

As a result of observation, no corrosion was observed, or corrosion occurred on the end face of the inner fin 2 and the heat exchanger swelled at that part, "○ (good)", inner fin 2 And, when the corrosion of the outer package 1 progressed and the heat exchanger leaked, it was evaluated as "x (defective)". The results are shown in Table 1.

As is clear from Table 1, the heat exchangers of Examples 1 to 3 were superior in appearance, pressure resistance (repeated pressure resistance), and corrosion resistance as compared with the heat exchangers of Comparative Examples 1 to 3.

The method for manufacturing the heat exchanger of the present invention includes measures against heat generation around the CPU and batteries of smartphones and personal computers, measures against heat generation around displays such as LCD TVs, organic ELTVs and plasma TVs, and measures against heat generation around automobile power modules and batteries. It can be used when manufacturing heat exchangers such as heaters used for floor heating and heat absorption measures such as snow melting, in addition to coolers used for heat generation measures of stationary heat generators such as super computers. ..

1: External capsule 16: Doorway 2: Inner fin (interior product)
3: Header (interior)
25: Recessed portion 26: Convex portion 51: Heat transfer layer 52: Heat transfer layer 61: Heat transfer layer 62: Heat transfer layer L1: Outer packaging laminating material L2: Inner core laminating material

Claims (8)

An interior in which a resin heat-sealing layer is provided at least on the outer surface inside an outer package made of an outer packaging material in which a resin heat-sealing layer is provided on the inner surface side of a metal heat transfer layer. It is a method of manufacturing a heat exchanger for manufacturing a heat exchanger in which goods are housed.
An external capsule fusion step of heat-sealing the external capsule laminating materials to each other at the outer peripheral edge of the external capsule,
Including an interior product fusion step of heat-sealing the interior product to the external capsule.
After performing the outer package fusion step, the interior product fusion step is performed, while the interior product fusion step is performed.
In the outer package fusion step, at least one of the fusion temperature, the fusion pressure, and the fusion time as the fusion conditions is increased for the interior product fusion step. A characteristic method for manufacturing a heat exchanger. The interior product is made of an inner core laminated material in which resin heat fusion layers are provided on both sides of a metal heat transfer layer, and includes inner fins having uneven portions.
The method for manufacturing a heat exchanger according to claim 1, wherein the interior product fusion step includes a fin fusion step of heat-sealing the uneven portion of the inner fin to the outer package. The interior product includes a header made of heat-fused resin, which is provided corresponding to an entrance / exit provided in the outer package and for moving a heat exchange medium in and out of the outer package.
The method for manufacturing a heat exchanger according to claim 2, wherein the interior product fusion step includes a header fusion step of heat-sealing the header to the external capsule. The method for manufacturing a heat exchanger according to claim 3, wherein the fin fusion step and the header fusion step are performed at the same time. The method for manufacturing a heat exchanger according to claim 3, wherein one of the fin fusion step and the header fusion step is performed, and then the other fusion step is performed. While the fusion temperature in the interior product fusion process is set to 165 ° C to 185 ° C,
3. The method for manufacturing a heat exchanger according to any one item. While the fusion pressure in the interior product fusion process is set to 0.15 MPa to 0.35 MPa,
Claimed to set the fusion pressure of the outer package fusion step to 0.2 MPa to 0.5 MPa and set 0.05 MPa to 0.15 MPa higher than the fusion pressure of the interior product fusion step. The method for manufacturing a heat exchanger according to any one of 1 to 6. While setting the fusion time of the interior product fusion process to 2 to 7 seconds,
Claims 1 to 7 in which the fusion time of the package fusion step is set to 4 to 10 seconds, and the fusion time of the interior product fusion step is set to be 2 to 3 seconds longer than the fusion time of the interior product fusion step. The method for manufacturing a heat exchanger according to any one item.

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