WO2020262434A1

WO2020262434A1 - Heat exchanger

Info

Publication number: WO2020262434A1
Application number: PCT/JP2020/024741
Authority: WO
Inventors: 森本　正和; 雅貴内山; 大未齊藤; 田中　聡; 安浩水野
Original assignee: 株式会社デンソー
Priority date: 2019-06-28
Filing date: 2020-06-24
Publication date: 2020-12-30
Also published as: JP7314655B2; JP2021007084A

Abstract

This heat exchanger includes a joint member (30) in which a plurality of metallic components (33, 34) are joined together, and heat is exchanged between a fluid flowing in a flow path formed inside the joint member and a substance which is located on the outside of the joint member and with which heat is to be exchanged. The first component (33) and the second component (34) are joined together through an adhesive (35). A first covalently bonded layer (36) is formed on the surface of the first component opposing the adhesive such that the interface between the first component and the adhesive is covalently bonded. A second covalently bonded layer (37) is formed on the surface of the second component opposing the adhesive such that the interface between the second component and the adhesive is covalently bonded.

Description

Heat exchanger

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2019-121066 filed on June 28, 2019, claiming the benefit of its priority, and all the contents of the patent application. Incorporated herein by reference.

This disclosure relates to heat exchangers.

Conventionally, there is a heat exchanger described in Patent Document 1 below. The heat exchanger described in Patent Document 1 is composed of a plurality of plate members joined to each other. A fluid flow path is formed inside the heat exchanger. Batteries can be installed on the outer surface of this heat exchanger. In this heat exchanger, it is possible to cool the battery by exchanging heat between the battery installed on the outer surface thereof and the fluid flowing inside the battery.

Special Table 2013-539899

Aluminum, copper, resin, stainless steel, etc. are mainly used as materials for forming various parts of heat exchangers. In particular, in heat exchangers mounted on vehicles, aluminum alloys are often used as a material for forming the components thereof. In such a heat exchanger, a plurality of parts made of an aluminum alloy are joined by brazing. As a material for parts suitable for brazing, 1000 series or 3000 series aluminum alloys are used. The reasons why this kind of aluminum alloy is used as a material for heat exchanger parts are as follows.

Aluminum alloy suitable for brazing is used as the brazing material for joining multiple parts to each other. During the manufacture of heat exchangers, a plurality of parts made of an aluminum alloy pre-coated with a brazing material are prepared. After the plurality of parts are assembled by a jig, the assembly is put into a furnace and heated. As a result, the brazing material on the surface of the parts melts, and the brazing material permeates the joint portion of each part. After that, the assembly is cooled by natural cooling or the like to complete the production of the heat exchanger. When a heat exchanger is manufactured through such a process, when the assembly is put into a furnace and heated, the additives contained in the aluminum alloy forming the parts may invade the brazing material. is there. When additives enter the brazing material, the characteristics of the brazing material change, and as a result, brazing may not be performed properly. In order to avoid such a problem, in the conventional heat exchanger, a material that does not hinder brazing, specifically, a 1000-series or 3000-series aluminum alloy is selected as a material for forming a part. ..

On the other hand, the 1000th series and 3000th series aluminum alloys have lower strength than, for example, the 5000th series and 7000th series aluminum alloys. Therefore, when a 1000th or 3000th aluminum alloy is used as the material for forming the parts, it is essential to thicken the parts in order to secure the pressure resistance of the heat exchanger against the pressure of the fluid flowing inside. ing. This has led to an increase in the weight of the heat exchanger. In particular, since a large heat exchanger is used as a heat exchanger for cooling a battery in an electric vehicle or the like, the increase in the weight is remarkable, which is one of the factors for reducing the cruising range of the vehicle.

It should be noted that such a problem is not limited to the heat exchanger for cooling the battery, but is a problem common to various heat exchangers.
An object of the present disclosure is to provide a heat exchanger capable of reducing weight while ensuring pressure resistance.

The heat exchanger according to one aspect of the present disclosure has a joining member in which a plurality of parts made of metal or resin are joined, and heat exchange between the fluid flowing through the flow path formed inside the joining member and the outside of the joining member. Heat exchange takes place with the subject. When the two parts to be joined to each other are the first part and the second part, the first part and the second part are joined to each other via an adhesive. A first covalent bond layer that covalently bonds the interface between the first component and the adhesive is formed on the surface of the first component facing the adhesive. A second covalent bond layer for covalently bonding the interface between the second component and the adhesive is formed on the surface of the second component facing the adhesive.

According to this configuration, since the first component and the second component are joined to each other via an adhesive, there are restrictions to be considered when brazing regarding the selection of the material forming the first component and the second component. There is no. Therefore, since the degree of freedom in selecting the materials for the first component and the second component can be improved, a material having higher strength can be selected as the material for forming them. Therefore, the first component and the second component can be thinned while ensuring the pressure resistance of the heat exchanger with respect to the pressure of the fluid flowing inside. As a result, it is possible to reduce the weight of the heat exchanger.

FIG. 1 is a diagram schematically showing a planar structure of the heat exchanger of the first embodiment. FIG. 2 is a cross-sectional view showing a cross-sectional structure of the heat exchange member of the first embodiment. FIG. 3 is an enlarged cross-sectional view of the cross-sectional structure of the joint portion of the first component and the second component in the heat exchange member of the first embodiment. FIG. 4 is a cross-sectional view showing a cross-sectional structure of a heat exchange member of a modified example of the first embodiment. FIG. 5 is an enlarged cross-sectional view of the cross-sectional structure of the joint portion of the first component and the second component in the heat exchange member of the second embodiment. FIG. 6 is a cross-sectional view showing a part of the manufacturing process of the heat exchanger of the second embodiment. FIG. 7 is a cross-sectional view showing a cross-sectional structure of the heat exchanger of the third embodiment.

Hereinafter, embodiments of the heat exchanger will be described with reference to the drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.
<First Embodiment>
First, the heat exchanger 10 of the first embodiment shown in FIG. 1 will be described. The heat exchanger 10 is used as a battery cooler for cooling a plurality of batteries 50 mounted on an electric vehicle. The plurality of batteries 50 supply electric power to an electric motor that is a power source of an electric vehicle and various other electric devices mounted on the electric vehicle. The heat exchanger 10 includes

tank members

20 and 21 and a plurality of heat exchange members 30.

The heat exchange member 30 is formed so as to extend in the direction indicated by the arrow Y. Inside the heat exchange member 30, a flow path Pw10 through which a cooling fluid flows is formed. The plurality of heat exchange members 30 are arranged at predetermined intervals in the direction indicated by the arrow X. The direction indicated by the arrow X is a direction orthogonal to the direction indicated by the arrow Y.

Of the plurality of heat exchange members 30, the end heat exchange member 30a arranged at one end in the direction indicated by the arrow X has an internal flow path Pw10 in the first internal flow path Pw11 and the second internal flow path Pw12. A partition portion 31 for partitioning is formed. The inflow port 32 and the outflow port 33 are formed so as to project on the outer peripheral surface of the end heat exchange member 30a in the vicinity of the partition portion 31. The inflow port 32 is communicated with the first internal flow path Pw11. The outlet 33 is communicated with the second internal flow path Pw12. In the following, among the plurality of heat exchange members 30, the heat exchange member 30 excluding the end heat exchange member 30a will be referred to as a "heat exchange member 30b". A battery 50 is installed on the outer surface of each heat exchange member 30b.

The

tank members

20 and 21 are formed so as to extend in the direction indicated by the arrow X. Inside the

tank members

20 and 21, flow paths Pw20 and Pw21 through which the cooling fluid flows are formed, respectively. The tank member 20 is provided so as to be joined to one end of each of the plurality of heat exchange members 30. The tank member 21 is provided so as to be joined to the other end of each of the plurality of heat exchange members 30. The internal flow path Pw20 of the tank member 20 is communicated with one end of each of the internal flow paths Pw10 of the plurality of heat exchange members 30. The internal flow path Pw21 of the tank member 21 is communicated with the other end of each of the internal flow paths Pw10 of the plurality of heat exchange members 30.

In this heat exchanger 10, the cooling fluid is supplied to the inflow port 32. The cooling fluid supplied to the inflow port 32 flows into the internal flow path Pw20 of the tank member 20 through the first internal flow path Pw11 of the end heat exchange member 30a, and then a plurality of heat exchanges other than the end heat exchange member 30a. It is distributed to each internal flow path Pw10 of the member 30b. The cooling fluid that has passed through the internal flow path Pw10 of each heat exchange member 30b is collected in the internal flow path Pw21 of the tank member 20 and then discharged from the outflow port 33 through the second internal flow path Pw12 of the end heat exchange member 30a. Will be done. The cooling water discharged from the outflow port 33 is cooled by heat exchange with the outside air in a radiator mounted on the vehicle, for example, and then returned to the inflow port 32 again.

Next, the structure of the heat exchange member 30 will be described in detail.
As shown in FIG. 2, the heat exchange member 30 has a structure in which the first component 33 and the second component 34 are joined to each other via an adhesive 35. In the present embodiment, the heat exchange member 30 corresponds to a joining member to which the first component 33 and the second component 34 are joined. Further, the cooling fluid flowing inside the heat exchange member 30 corresponds to the fluid flowing inside the joining member, and the battery 50 corresponds to the heat exchange target outside the joining member.

The second component 34 is formed in a flat plate shape. The second component 34 is made of aluminum. Specifically, the second component 34 is formed of any one of 2000 series, 5000 series, 6000 series, 7000 series, and 8000 series aluminum alloy. One surface 340 of the second component 34 is an installation surface on which the battery 50 is installed. The first component 33 is adhered to the other surface 341 of the second component 34 via an adhesive 35.

The first component 33 is formed so that the cross-sectional shape orthogonal to the direction indicated by the arrow Y is concave. Like the second component 34, the first component 33 is formed of any one of 2000 series, 5000 series, 6000 series, 7000 series, and 8000 series aluminum alloy. A flange portion 330 is formed on the outer peripheral portion of the opening of the first component 33. The surface 330a of the flange portion 330 is adhered to the first component 33 via the adhesive 35. The internal flow path Pw10 of the heat exchange member 30 is formed by the inner wall surface 331 of the first component 33, the surface 341 of the second component, and the space surrounded by the adhesive 35.

The adhesive 35 is provided between the surface 330a of the flange portion 330 of the first component 33 and the surface 341 of the second component 34, and joins them. As the adhesive 35, a silicon-based adhesive is used.
As shown in FIG. 3, the first covalent bond layer 36 is formed on the surface 330a of the flange portion 330 facing the adhesive 35 in the first component 33. The first covalent bond layer 36 joins them by covalently bonding the interface between the first component 33 and the adhesive 35. Similarly, a second covalent bond layer 37 is formed on the surface 341 of the second component 34 facing the adhesive 35. The second covalent bond layer 37 joins them by covalently bonding the interface between the second component 34 and the adhesive 35. As a material for forming the first covalent bond layer 36 and the second covalent bond layer 37, a silicate glass layer, more specifically, an aluminosilicate glass layer is used.

Next, a method of manufacturing the heat exchange member 30 will be described.
When manufacturing the heat exchange member 30, first, the concave first part 33 and the flat plate-shaped second part 34 are molded, and then the first covalent bond layer 36 is formed on the surface 330a of the first part 33. At the same time, the second covalent bond layer 37 is formed on the surface 341 of the second component 34. Specifically, the covalent bond layers 36 and 37 are formed on the

parts

33 and 34 by dipping, shower coating, roll coating and the like using the liquid corresponding to the covalent bond layers 36 and 37, respectively. After that, the flange portion 330 of the first component 33 and the second component 34 are adhered to each other via the adhesive 35 to complete the production of the heat exchange member 30.

Next, the operation and effect of the heat exchanger 10 of the present embodiment will be described.
In the heat exchanger 10 of the present embodiment, since the first component 33 and the second component 34 are joined to each other via the adhesive 35, regarding the selection of the material forming the first component 33 and the second component 34, There are no restrictions to consider when brazing. Therefore, since the degree of freedom in selecting the materials for the first component 33 and the second component 34 can be improved, a material having higher strength can be selected as the material for forming them. Specifically, as the material of the first part 33 and the second part 34, instead of the conventional 1000 series and 3000 series aluminum alloys, 2000 series, 5000 series, 6000 series, 7000 series, And any aluminum alloy of the 8000 series can be used. Therefore, the first component 33 and the second component 34 can be thinned while ensuring the pressure resistance of the heat exchanger 10 with respect to the pressure of the cooling fluid flowing inside. As a result, the heat exchanger 10 can be made lighter.

(Modification example)
Next, a modification of the heat exchanger 10 of the first embodiment will be described.
As shown in FIG. 4, in the heat exchanger 10 of this modified example, the battery 51 is further arranged on the bottom surface 332 of the first component 33. According to such a configuration, the number of batteries that can be installed in the heat exchanger 10 can be increased, in other words, the number of batteries that can be cooled by the heat exchanger 10 can be increased.

<Second Embodiment>
Next, the heat exchanger 10 of the second embodiment will be described. Hereinafter, the differences from the heat exchanger 10 of the first embodiment will be mainly described.
As shown in FIG. 5, the flange portion 330 of the first component 33 of the present embodiment is formed with a stepped portion 333 and a protruding portion 334.

The step portion 333 is a portion that is arranged with a predetermined gap from the second component 34 and is arranged substantially parallel to the surface 341 of the second component 34.
The projecting portion 334 is formed so as to project from substantially the center of the step portion 333 toward the second component 34. The tip surface 334a of the protrusion 334 is a flat surface substantially parallel to the surface 341 of the second component 34. The tip surface 334a of the protrusion 334 is adhered to the surface 341 of the second component 34 via the adhesive 35.

As shown in FIG. 5, the adhesive 35 is arranged in the gap between the step portion 333 of the first component 33 and the surface 341 of the second component 34. The adhesive 35 is arranged on the outer peripheral portion of the protruding portion 334. The adhesive 35 joins the stepped portion 333 of the first component 33 and the surface 341 of the second component 34 by adhering them. An arcuate fillet 335 is formed on the outer surface of the adhesive 35.

The joint structure between the tip surface 334a of the protruding portion 334 via the adhesive 35 and the surface 341 of the second component 34, and the stepped portion 333 of the first component 33 and the surface of the second component 34 via the adhesive 35. Since a structure similar to the structure shown in FIG. 3 is adopted for the joint structure with 341, a detailed description thereof will be omitted.

Next, a method of manufacturing the heat exchanger 10 of the present embodiment will be described.
When manufacturing the heat exchanger 10 of the present embodiment, first, the first component 33 and the second component 34 are molded, and then the first covalent bond layer 36 is formed on the surface 330a of the first component 33, and the first covalent bond layer 36 is formed. A second covalent bond layer 37 is formed on the surface 341 of the second component 34. Then, as shown in FIG. 6, the adhesive 35 is applied to the tip surface 334a of the protruding portion 334 of the first component 33. After that, the second component 34 is placed on the tip surface 334a of the protruding portion 334 of the first component 33, so that the first component 33 and the second component 34 are joined via the adhesive 35. At that time, the height H of the protruding portion 334 of the first component 33 is preset so that the fillet 335 as shown in FIG. 5 is formed on the outer surface of the adhesive 35.

Next, the operation and effect of the heat exchanger 10 of the present embodiment will be described.
In the heat exchanger 10 of the present embodiment, as shown in FIG. 5, the protruding portion 334 of the first component 33 is joined to the second component 34 via the adhesive 35. According to such a structure, the length of the bonded portion between the first component 33 and the second component 34 can be arbitrarily set by appropriately adjusting the length L of the protruding portion 334 of the first component 33. it can. Therefore, if the length L of the protruding portion 334 of the first component 33 is set to a length equal to or longer than the length required for adhesion, the bonding strength of the first component 33 and the second component 34 via the adhesive 35 can be increased. Can be secured.

On the other hand, in such a heat exchanger 10, the heat exchange member 30 is stretched and contracted due to, for example, a temperature change of the cooling liquid. When a local stress is applied to the outer surface of the adhesive 35 due to such deformation of the heat exchange member 30, the adhesive 35 may be damaged, and as a result, the bonding of the first component 33 and the second component 34 may be released. There is sex. In this respect, in the heat exchange member 30 of the present embodiment, since the fillet 335 is formed on the outer surface of the adhesive 35, it is difficult for local stress to act on the outer surface of the adhesive 35. Therefore, it is unlikely that the adhesive 35 will be damaged when the heat exchange member 30 is stretched or contracted, so that it is easy to maintain the state in which the first component 33 and the second component 34 are joined.

<Third Embodiment>
Next, the heat exchanger 10 of the third embodiment will be described.
As shown in FIG. 7, the heat exchanger 10 of the present embodiment is a double-tube internal heat exchanger. The heat exchanger 10 includes a first pipe member 60, a second pipe member 70, and an inflow pipe 80. As the material for forming the first pipe member 60, the second pipe member 70, and the inflow pipe 80, the same material as that used for the first component 33 and the second component 34 of the first embodiment may be used. It is possible.

The first pipe member 60 is formed in an annular shape about the axis m. The internal space of the first pipe member 60 constitutes a first internal flow path Pw31 through which the first fluid flows.
The second pipe member 70 is also formed in an annular shape about the axis m. The second pipe member 70 has an inner diameter larger than that of the first pipe member 60, and the first pipe member 60 is housed therein. One end of the second pipe member 70 is joined to the outer peripheral surface of the first pipe member 60. The space surrounded by the inner peripheral surface of the second pipe member 70 and the outer peripheral surface of the first pipe member 60 constitutes a second internal flow path Pw32 through which the second fluid flows.

In this heat exchanger 10, heat exchange is performed between the first fluid flowing through the first internal flow path Pw31 and the second fluid flowing through the second internal flow path Pw32.
One end of the first pipe member 60 projects from one end of the second pipe member 70. An inflow pipe 80 for allowing the first fluid to flow into the first pipe member 60 is joined to one end of the first pipe member 60. Specifically, the inner peripheral surface of one end of the inflow pipe 80 is joined to the outer peripheral surface of one end of the first pipe member 60 via an adhesive 35. Since the structure similar to the structure shown in FIG. 3 is adopted for the joint structure of the inflow pipe 80 and the first pipe member 60 via the adhesive 35, a detailed description thereof will be omitted.

In the present embodiment, the first pipe member 60 and the inflow pipe 80 joined to each other correspond to the joining member 90, and the first pipe member 60 and the inflow pipe 80 correspond to the parts constituting the joining member. Further, the first fluid flowing inside the first pipe member 60 and the inflow pipe 80 corresponds to the fluid flowing inside the joining member, and the second fluid corresponds to the heat exchange target outside the joining member.

Even the heat exchanger 10 of the present embodiment having the structure as shown in FIG. 7 can obtain the same or similar operation and effect as the heat exchanger 10 of the first embodiment.
<Other embodiments>
In addition, each embodiment can also be implemented in the following embodiments.

-The first component 33 and the second component 34 of the heat exchange member 30 of the first and second embodiments may be formed of a metal such as aluminum, iron, stainless steel, or a resin. The same applies to the first pipe member 60, the second pipe member 70, and the inflow pipe 80 of the third embodiment.
-The adhesive 35 of each embodiment is not limited to silicon-based adhesives, but epoxy-based adhesives, polyurethane-based adhesives, polyester-based adhesives, melanin-based adhesives, urea resin-based adhesives, and the like can be used. It is possible.

・ This disclosure is not limited to the above specific examples. Specific examples described above with appropriate design changes by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, and their arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

Claims

It has a joining member (30, 90) to which a plurality of parts (33, 34, 60, 80) made of metal or resin are joined, and a fluid flowing through a flow path formed inside the joining member and the joining member. A heat exchanger that exchanges heat with an external heat exchange target.
When the two parts joined to each other are the first part (33,60) and the second part (34,80),
The first part and the second part are joined to each other via an adhesive (35).
On the surface of the first component facing the adhesive, a first covalent bond layer (36) for covalently bonding the interface between the first component and the adhesive is formed.
A heat exchanger in which a second covalent bond layer (37) for covalently bonding the interface between the second component and the adhesive is formed on the surface of the second component facing the adhesive.
The heat exchanger according to claim 1, wherein at least one of the first covalent bond layer and the second covalent bond layer is made of a silicate glass layer.
The heat exchanger according to claim 1, wherein at least one of the first covalent bond layer and the second covalent bond layer is made of an aluminosilicate glass layer.
Any one of claims 1 to 3, wherein the adhesive comprises any one of a silicon-based adhesive, an epoxy-based adhesive, a polyurethane-based adhesive, a polyester-based adhesive, a melanin-based adhesive, and a urea resin-based adhesive. The heat exchanger described in the section.
The heat exchanger according to any one of claims 1 to 4, wherein the component is made of any one of aluminum, iron, and stainless steel.
The heat exchange according to any one of claims 1 to 4, wherein the component is made of an aluminum alloy of any one of 2000 series, 5000 series, 6000 series, 7000 series, and 8000 series. vessel.
The second component (34) is formed in a flat plate shape.
The first component (33) includes a stepped portion (333) arranged with a predetermined gap from the first component, and a protruding portion (334) protruding from the stepped portion toward the second component. Have and
The heat exchanger according to any one of claims 1 to 6, wherein the protruding portion is joined to the second component via the adhesive.
The adhesive is formed in the outer peripheral portion of the protruding portion and in the gap formed between the first component and the stepped portion of the second component.
The heat exchanger according to claim 7, wherein a fillet (335) is formed on the outer surface of the adhesive.
The heat exchange target is a battery (50) mounted on an electric vehicle.
The heat exchanger according to any one of claims 1 to 8, wherein the battery is cooled by exchanging heat between the fluid flowing through the flow path formed inside the joining member and the battery.
The heat exchanger according to claim 9, wherein the component provided on the battery side of the first component and the second component is made of an aluminum alloy.