JP6186146B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger for cooling a heating element such as an IGBT (Insulated Gate Bipolar Transistor).

  Inverter units are used as electronic components for controlling drive motors in hybrid vehicles that are now widely used and electric vehicles that are attracting attention as next-generation environmentally-friendly vehicles. The inverter unit is provided with an IGBT that performs a switching function. The IGBT generates heat during use, but it cannot perform its original function at a high temperature. Therefore, the IGBT needs to be sufficiently cooled. On the other hand, the characteristics required of IGBTs such as a high-speed switching function are increasing year by year, and the amount of heat generation is also increasing along with this, and improvement of the function of the system for cooling the IGBTs is increasingly regarded as important.

  It is effective to use a heat sink for cooling the IGBT. The heat sink is manufactured using a material having good thermal conductivity, and has a function of dissipating heat from the heating elements arranged in contact with each other by increasing the surface area per unit area. As forms for increasing the surface area, there are various forms such as a fin type and a corrugated type.

  Further, in order to further improve the heat dissipation performance, a liquid cooling type cooling system that efficiently dissipates heat using the coolant as a medium is known by disposing the fin portion of the heat sink in the coolant channel through which the coolant flows. . For example, Patent Document 1 proposes a heat exchanger in which a coolant channel through which a coolant flows and an inlet and an outlet of the coolant are formed in a lower case that receives an upper case as a heat sink. In the heat exchanger described in Patent Document 1, the upper case and the lower case are joined by friction stir welding in a state where the fin portion of the heat sink is disposed in the refrigerant flow path portion of the lower case. The heat exchanger manufactured in this manner exhibits its cooling function by placing a heating element such as IGBT in contact with the surface of the upper case opposite to the fin portion.

  In addition, a heat exchanger for cooling an in-vehicle IGBT is required to be small and light as well as heat dissipation performance. In order to meet such demands, there is a heat exchanger that employs an aluminum alloy.

JP 2010-69503 A

  However, the heat exchanger disclosed in Patent Document 1 has a relatively complicated shape in both the upper case and the lower case. As a method for forming such an upper case and a lower case, casting such as die casting or forging is generally employed. However, the method of forming the housing by casting or forging is not necessarily excellent in productivity, and the development of other manufacturing methods has been desired.

  In addition, when the housing part is formed by forging, it is difficult to reduce the wall thickness and the bottom surface of the flow path, so there is a problem that there is a limit to the weight reduction and miniaturization of the housing part. there were.

  The present invention has been made in view of the above-described background, and aims to provide a heat exchanger that is excellent in heat dissipation, is small and lightweight, and is excellent in productivity.

One aspect of the present invention is a top plate portion having a heating element mounting surface on the outer surface for mounting a heating element;
A housing portion having a bottom plate portion, a side wall portion erected from an outer peripheral edge portion of the bottom plate portion, and a cylindrical collar portion erected outward from the bottom plate portion ;
A heat sink portion disposed in a refrigerant flow path surrounded by the top plate portion and the housing portion;
A pair of refrigerant inlets and outlets disposed in the collar portion and communicating with the refrigerant flow path;
A pair of refrigerant conduits inserted into the collar portion and connected to the pair of refrigerant conduits ;
Upper Kitenban portion and the housing portion is formed an aluminum plate by pressing,
The aluminum plate is made of a clad material composed of a core material and a brazing material laminated on at least the inner surface side of the core material, and the brazing material has a lower melting point than the core material and is made of a material constituting the heat sink part. Has a low melting point,
By the brazing material, the top plate portion and the housing portion are brazed and joined, and the heat sink portion is brazed and joined to at least the top plate portion ,
The brazing material provided on the inner peripheral surface of the collar part in the housing part is characterized in that the collar part and one end of the refrigerant guide / exhaust pipe inserted into the collar part are brazed and joined. (1).

  In the heat exchanger, the heat sink part and the top plate part are brazed and joined. Therefore, the heat generated from the heating element is easily transferred from the heating element mounting surface to the heat sink part, and when the refrigerant liquid circulates in the refrigerant flow path, the wall surface of the refrigerant flow path and the refrigerant liquid Heat exchange between them is performed more efficiently. As a result, since the refrigerant liquid can efficiently remove heat from the heat radiating fin portion, the heat exchanger has excellent heat radiating performance.

  The top plate portion and the housing portion are formed by pressing an aluminum plate as a material. Since the pressing of the plate material is a processing method that easily forms a thin member, the thickness of the top plate portion and the housing portion can be easily reduced. As a result, the heat exchanger can be easily reduced in weight.

  In addition, by using an aluminum plate as the material for the top plate portion and the housing portion, it is not necessary to use casting or forging in the production process of main parts. Therefore, it becomes easy to shorten the manufacturing process of main components, and the productivity of the whole heat exchanger can be easily improved.

  Moreover, the said aluminum plate which comprises the said top-plate part and the said housing part consists of the said clad material, and the said brazing material is distribute | arranged to the at least inner surface side of the said heat exchanger. Therefore, by placing the top plate portion on the housing portion and melting the brazing material in a state where the heat sink portion is in contact with at least the brazing material of the top plate portion, the top plate portion and The brazing joint between the housing part and the brazing joint between the top plate part and the heat sink part can be performed at a time. As a result, the heat exchanger is excellent in productivity.

  As described above, the heat exchanger has excellent heat dissipation, is small and light, and has excellent productivity.

The components expanded view of the heat exchanger in the reference example 1. FIG. The perspective view of the heat exchanger in the reference example 1. FIG. The top view of the heat exchanger in the reference example 1. FIG. The side view of the heat exchanger in the reference example 1. FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 3. The perspective view of the heat sink part in the reference example 1. FIG. The side view of the heat exchanger which has a pipe-shaped refrigerant | coolant guide / exhaust pipe in Example 1. FIG. IX-IX arrow directional cross-sectional view of FIG. Sectional drawing of the heat exchanger which has the heat sink part which used the corrugated board in the reference example 2 (sectional drawing corresponded in FIG. 5). Sectional drawing (sectional drawing corresponded in FIG. 5) of the heat exchanger which has the heat sink part which used the extrusion multi-hole tube in the reference example 3. FIG.

  The said heat exchanger WHEREIN: The said refrigerant | coolant conducting / exhausting pipe may be comprised from the nipple part connected to the said refrigerant | coolant conducting / exhausting port, and the pipe part connected to this nipple part (Claim 2). In this case, the pipe portion can be connected to the nipple portion after the nipple portion is brazed and joined. As a result, it is not necessary to consider the shape of the pipe part at the time of brazing and joining, so the shape of the pipe part can be selected more freely.

Moreover, the said baseplate part and the said nipple part may be brazed and joined by the brazing sheet interposed between both .

  In this case, a sufficient amount of brazing material is supplied between the nipple portion and the brazing sheet during brazing and joining. As a result, the bottom plate portion and the nipple portion can be more reliably joined. Here, as the brazing sheet, for example, a three-layer clad material composed of a so-called core material and a brazing material laminated on both surfaces thereof can be used.

Further, the pair of refrigerant inlet / outlet ports have a cylindrical collar portion erected outward from the bottom plate portion, and the brazing material is disposed on the inner peripheral surface of the collar portion, One end of the refrigerant guide / exhaust pipe inserted into the collar portion is brazed and joined by the brazing material . Therefore , it is not necessary to separately prepare a brazing material for brazing and joining the refrigerant guide / exhaust pipe and the bottom plate portion. Further, the joining of the refrigerant guide / exhaust pipe and the bottom plate can be performed simultaneously with the joining of the heat sink. As a result, the heat exchanger is more productive.

  Although various aspects can be adopted as the heat sink part, those having a large contact area with the refrigerant liquid and a small flow resistance of the refrigerant liquid are preferable. The larger the contact area between the heat sink part and the refrigerant liquid, the easier it is for the refrigerant liquid to remove heat, so the heat dissipation performance of the heat exchanger is further improved. In addition, the smaller the flow resistance of the refrigerant liquid, the easier it is to increase the flow rate of the refrigerant liquid, so that the heat dissipation performance of the heat exchanger is further improved.

As an embodiment of the heat sink portion, can be employed which consists of a plate-like base portion, and one radiating fin portion erected from the surface of the base portion (claim 3). The heat sink portion configured as described above can easily increase the dimensional accuracy. Moreover, since the said heat sink part can perform position alignment at the time of arrange | positioning in the said refrigerant | coolant flow path by the said base part, it becomes easy to reduce the position shift in a refrigerant | coolant flow path. As a result, the heat exchanger using the heat sink portion can easily reduce the flow resistance of the refrigerant liquid and can easily improve the heat dissipation performance.

Further, when using a heat sink part having the base part and the radiating fin part, the base part and the bottom plate part are brazed and joined by the brazing material, and the tip of the radiating fin part and the top plate part Are preferably brazed and joined by the brazing material ( claim 4 ). By disposing the heat sink portion in this way, only the top plate portion is disposed between the refrigerant flow path and the heating element mounting surface. Therefore, it becomes easy to reduce the thickness of the metal between the refrigerant flow path and the heating element mounting surface, and the thermal resistance can be reduced. As a result, the heat dissipation performance of the heat exchanger can be further improved.

  The shape of the heat radiating fin part is, for example, a pin fin in which a large number of heat radiating plates are arranged in the thickness direction, and a plate fin having a cross-sectional cross-section or a large number of columnar bodies such as a cylinder or a prism. Alternatively, various modes such as a corrugated fin having a corrugated cross section can be adopted.

Further, as another aspect of the heat sink portion, a corrugated plate having a corrugated cross section is employed, and at least the top of one surface of the corrugated plate and the top plate portion are brazed and joined by the brazing material. ( Claim 5 ). Since the corrugated plate can be easily thinned, the contact area with the refrigerant liquid can be increased with a relatively small amount of material. Therefore, the heat exchanger can be easily reduced in weight, and the heat dissipation performance can be further improved.

Further, as yet another aspect of the heat sink part, an extruded multi-hole pipe formed by extrusion and having a plurality of refrigerant flow holes therein is adopted, and the extruded multi-hole pipe is formed by both the top plate part and the bottom plate part. And the brazing material may be brazed and joined ( claim 6 ). Since extrusion molding is a processing method with excellent productivity, the extruded multi-hole tube has excellent productivity. As a result, the productivity of the entire heat exchanger can be easily improved. Furthermore, since the length of the extruded multi-hole tube can be freely selected, the heat exchanger can be easily changed in design such as a change in cooling capacity.

Further, the refrigerant flow path is divided into a plurality of flow path areas by a central wall part arranged between the top plate part and the bottom plate part, and a heat sink part is arranged in each of the plurality of flow path areas. It may be provided ( Claim 7 ). In this case, the heat exchanger is suitable for cooling the heating elements arranged in a plurality of rows. In addition, the plurality of flow channel regions can have an appropriate range for making the flow velocity distribution of the refrigerant liquid flowing through the individual flow channel regions uniform. Thereby, since it becomes easy for a refrigerant | coolant liquid to contact the said heat sink part uniformly, it becomes possible to thermally radiate heat uniformly from the said heat sink part whole. As a result, the heat exchanger can cool a plurality of heating elements uniformly.

Further, the core material in the top plate part and the housing part contains Mg: 1.3% (mass%, the same applies hereinafter) or less, has a chemical component consisting of the balance Al and inevitable impurities, and the above The brazing material contains Si: 6 to 13%, Li: 0.004 to 0.1%, and may have a chemical component composed of the balance Al and inevitable impurities ( claim 8 ). By using the clad material configured in this way as a material for the top plate part and the housing part, it is possible to perform brazing joining of the heat exchanger without using flux in an inert gas atmosphere. It becomes. As a result, since it becomes easy to improve the productivity in the brazing process of the heat exchanger, the productivity of the entire heat exchanger can be further improved.

  The brazing material contains 6 to 13% Si. As a result, the amount of the brazing material flowing into the joint can be sufficiently increased, and the soundness of the joint can be further improved even when brazing without using a flux in an inert gas atmosphere. . If the Si content is less than 6%, the amount of inflow of the brazing material tends to be insufficient, and the fluidity of the brazing material may be reduced. Therefore, in this case, there is a possibility that the soundness of the bonding is lowered. On the other hand, if the Si content exceeds 13%, the amount of dissolution of the base material may be excessive, and coarse primary crystal Si is likely to be formed in the brazing material. Therefore, in this case, there is a possibility that a melting hole is generated during brazing and joining.

  The brazing material contains 0.004 to 0.1% Li. And the said core material contains 1.3% or less of Mg. The brazing material containing Li and the core material containing Mg are laminated adjacent to each other, so that the joint soundness is improved even when brazing without using flux in an inert gas atmosphere. Can be made. Although the mechanism for improving the soundness of bonding by Li and Mg has not been completely elucidated, the mechanisms considered to be appropriate at present are as follows.

  Since Mg is difficult to come into contact with the outside air due to the brazing material, the abundance ratio of MgO having low reactivity is reduced. When heating for brazing is started in this state, Mg begins to diffuse slowly toward the brazing material, and rapidly diffuses into the melt of the brazing material as the brazing material begins to melt. At this time, Mg and Li present in the melt of the brazing material are hardly oxidized due to the inert gas atmosphere, and are in a highly reactive state.

When Mg in the molten liquid comes into contact with the oxide film (Al ₂ O ₃ ) present in the portion to be joined, it reacts with the oxide film to produce an AlMgO ₄ spinel compound. Thereby, an oxide film can be made weak. Moreover, Li in the melt also has an action of weakening the oxide film. Therefore, the oxide film in contact with the brazing material melt is likely to be broken by the synergistic effect of Mg and Li, and the new surface is easily exposed at the portion to be joined.

  Moreover, Mg and Li have the effect | action which lowers | hangs the surface tension of a melt and improves fluidity besides making an oxide film weak. Therefore, due to the synergistic effect of Mg and Li, the size of the fillet can be made sufficiently large, and the brazing material can easily enter even in a narrow gap. As described above, it is considered that the clad material can further improve the soundness of bonding due to both the weakening of the oxide film and the improvement of fluidity.

If the Li content is less than 0.004%, the fluidity may be insufficient, and the oxide film may be insufficiently brittle. Therefore, in this case, there is a possibility that the soundness of the bonding is lowered. On the other hand, when the content of Li exceeds 0.1%, LiO ₂ formed during brazing joining becomes excessive, and the soundness of joining may be reduced.

  On the other hand, if the Mg content exceeds 1.3%, the melting point of the core material may be excessively lowered, and brazing joining may be difficult. On the other hand, the lower limit of the Mg content is not particularly limited, but the content is more preferably 0.2% or more in order to further improve the soundness of the brazing joint. In this case, it becomes easier to improve the fluidity of the brazing material, and the oxide film can be sufficiently weakened.

The core material further includes Mn: 0.05 to 1.8%, Si: 1.0% or less, Fe: 1.0% or less, Cu: 0.9% or less, Zn: 6.5% or less, Ti: It may contain one or more chemical components selected from the group consisting of 0.2% or less and Zr: 0.5% or less ( claim 9 ). Examples of aluminum alloys having such chemical components are 3000 series (Al-Mn series), 5000 series (Al-Mg series), 6000 series (Al-Mg-Si series), or 7000 series (Al-Zn series). Alloys belonging to can be used. These aluminum alloys can be appropriately selected according to characteristics required for a heat exchanger such as strength, corrosion resistance, and formability.

In addition to the above-described two-layer clad material, a three-layer clad material can also be used as a material for the top plate portion and the housing portion. That is, the clad material constituting the top plate part and the housing part has an intermediate material laminated between the core material and the brazing material, and the intermediate material contains Mg: 1.3% or less. And the brazing material contains Si: 6-13% and Li: 0.004-0.1%, and consists of the balance Al and inevitable impurities. It may have a chemical component ( claim 10 ). Also in this case, since the brazing material containing Li and the intermediate material containing Mg are laminated adjacent to each other, brazing joining is performed without using a flux in an inert gas atmosphere as described above. Even in this case, the soundness of the bonding can be further improved.

The intermediate material further includes Mn: 0.05 to 1.8%, Si: 1.0% or less, Fe: 1.0% or less, Cu: 0.9% or less, Zn: 6.5% or less, Ti May contain one or more chemical components selected from the group consisting of: 0.2% or less, Zr: 0.5% or less ( claim 11 ). Examples of aluminum alloys having such chemical components are 3000 series (Al-Mn series), 5000 series (Al-Mg series), 6000 series (Al-Mg-Si series), or 7000 series (Al-Zn series). Alloys belonging to can be used.

Further, when a three-layer clad material is used as a material for the top plate and the housing, the core material contains Mn: 0.05 to 1.8%, and a chemical component composed of the balance Al and inevitable impurities. ( Claim 12 ). In this case, the core material further contains Si: 1.0% or less, Fe: 1.0% or less, Cu: 0.9% or less, Zn: 6.5% or less, Ti: 0.2% Hereinafter, one or more chemical components selected from the group consisting of Zr: 0.5% or less may be contained ( claim 13 ). As an aluminum alloy having such a chemical component, for example, alloys belonging to 3000 series (Al-Mn series) and 7000 series (Al-Zn series) can be used. These aluminum alloys can be appropriately selected according to characteristics required for a heat exchanger such as strength, corrosion resistance, and formability.

The brazing material may further contain one or two chemical components selected from the group consisting of Bi: 0.004 to 0.2% and Mg: 0.05 to 0.4%. ( Claim 14 ). These chemical components have the effect of reducing the surface tension of the melt of the brazing material and improving the fluidity. Further, these chemical components may be added alone or exert their effects even when added in combination. Therefore, in this case, the fluidity of the brazing material can be further improved, and the soundness of bonding can be further improved.

  When the Bi content is less than 0.004%, it is difficult to obtain the fluidity improving effect by adding Bi. On the other hand, if the Bi content exceeds 0.2%, the color of the brazing material is remarkably changed and no improvement in the bonding property is recognized. On the other hand, when the Mg content is less than 0.05%, it is difficult to obtain the fluidity improvement effect by adding Mg. On the other hand, when the Mg content exceeds 0.4%, MgO having low reactivity is easily formed on the surface of the brazing material, and it becomes difficult to obtain an effect commensurate with the addition of Mg.

The brazing material may further contain one or two chemical components selected from the group consisting of Sr: 0.002 to 0.05% and Sb: 0.003 to 0.07%. ( Claim 15 ). These chemical components have the effect of refining the Al—Si eutectic structure contained in the brazing material and improving the fluidity. Further, these chemical components may be added alone or exert their effects even when added in combination. Therefore, in this case, when the Al—Si eutectic structure is refined, the fluidity of the brazing material is further improved, and the soundness of bonding can be further increased.

  When the Sr content is less than 0.002%, the effect of refining the Al—Si eutectic structure may be insufficient. On the other hand, when the Sr content exceeds 0.05%, the effect of refining the Al—Si eutectic structure begins to saturate, and an effect commensurate with the added amount cannot be obtained. If the Sb content is less than 0.003%, the effect of refining the Al—Si eutectic structure may be insufficient. On the other hand, when the Sb content exceeds 0.07%, the brazing material may not be filled into the narrow gap.

Moreover, the brazing material is one or more selected from the group consisting of Fe: 0.05 to 0.8%, Mn: 0.05 to 0.2%, Ti: 0.01 to 0.15%, or Two or more chemical components may be contained ( claim 16 ). These elements have the effect of increasing the viscosity of the melt of the brazing material. Further, these elements may be added alone or exert their effects even when added in combination. By adding these chemical components, the viscosity of the melt of the brazing material is increased, so that it is easier to suppress the melt of the brazing material from dripping down due to its own weight. As a result, the soundness of bonding can be further increased.

( Reference Example 1 )
A reference example of the heat exchanger will be described with reference to FIGS. As shown in FIG. 1, the heat exchanger 1 includes a top plate portion 2, a housing portion 3, and a heat sink portion 4. The top plate 2 has a heating element mounting surface 21 for mounting the heating element on the outer surface. The housing part 3 has a bottom plate part 31 and a side wall part 32 erected from the outer peripheral edge part of the bottom plate part 31. The heat sink part 4 is arranged in a refrigerant flow path 12 surrounded by the top plate part 2 and the housing part 3. Further, as shown in FIG. 1, the bottom plate portion 31 is provided with a pair of refrigerant introduction / exhaust ports 311 communicating with the refrigerant flow path 12, and as shown in FIG. A pair of refrigerant guide / exhaust pipes 5 are connected.

  The top plate portion 2 and the housing portion 3 are formed by pressing an aluminum plate. As shown in FIG. 5, the aluminum plate used as a material for the top plate portion 2 and the housing portion 3 is composed of a clad material C comprising a core material A and a brazing material B laminated on at least the inner surface side of the core material A. Yes. The brazing material B has a melting point lower than that of the core material A and lower than that of the material constituting the heat sink portion 4. As shown in FIG. 5, the top plate portion 2 and the housing portion 3 are brazed and joined by the brazing material B, and the heat sink portion 4 is brazed and joined to at least the top plate portion 2.

  As shown in FIG. 3, the heat exchanger 1 has a substantially rectangular shape when viewed from the overlapping direction of the top plate portion 2 and the bottom plate portion 31 (hereinafter, this direction is referred to as “height direction Z”). . As shown in FIGS. 1, 3, and 5, two heat sink portions 4 are arranged side by side between the top plate portion 2 and the bottom plate portion 31 (hereinafter referred to as the heat sink portion 4). The arrangement direction is referred to as “horizontal direction Y”, and the direction orthogonal to both the horizontal direction Y and the height direction Z is referred to as “vertical direction X”.

  Further, as shown in FIGS. 1 and 5, a central wall portion 13 that divides the refrigerant flow path 12 is disposed between the two heat sink portions 4. As a result, the refrigerant flow path 12 is divided into two flow path regions 120 by the central wall portion 13 disposed between the top plate portion 2 and the bottom plate portion 31 as shown in FIG. One heat sink portion 4 is disposed in each of the road regions 120. Although not shown in the drawing, communication passages for distributing the refrigerant liquid between the two flow path regions 120 are formed at both ends in the longitudinal direction X of the refrigerant flow path 12.

  As shown in FIGS. 2 and 3, each of the corner portions 100 facing each other in a substantially rectangular shape when the heat exchanger 1 is viewed from the height direction Z has a pair of projecting portions 11 projecting in the longitudinal direction X. Is formed. As shown in FIGS. 2 to 4, the refrigerant guide / exhaust pipe 5 is disposed on the bottom plate portion 31 side of the pair of projecting portions 11.

  Moreover, as shown in FIG.2 and FIG.3, several fixing | fixed part 14 for fastening the heat exchanger 1 to a mounting position is shown in the outer peripheral part in the substantially rectangular shape which looked at the heat exchanger 1 from the height direction Z. Is provided. As shown in FIGS. 1, 4, and 5, the fixing portion 14 is configured by disposing a substantially disc-shaped reinforcing member 140 between the top plate portion 2 and the housing portion 3. Further, both end surfaces of the reinforcing member 140 are brazed and joined to the top plate portion 2 and the brazing material B of the housing portion 3. Moreover, the some fixing | fixed part 14 has the bolt penetration hole 141 which penetrates the volt | bolt for fastening the heat exchanger 1 as shown in FIG.

  As shown in FIGS. 1 to 3, the top plate 2 has substantially the same shape as the heat exchanger 1 viewed from the height direction Z. Moreover, as shown in FIG. 5, the top plate part 2 is comprised from the clad material C which consists of the core material A and the brazing material B laminated | stacked by the cladding rate of 5-15% on the single side | surface, The brazing material B is arranged on the inner surface side (the refrigerant flow path 12 side). In this example, JIS6063 alloy was used for the core material A, and JIS4004 alloy was used for the brazing material B.

  As shown in FIG. 1, the housing portion 3 includes a bottom plate portion 31 that is substantially rectangular when viewed from the height direction Z, and a side wall portion 32 that is erected on the outer peripheral edge of the bottom plate portion 31. Moreover, the housing part 3 is comprised from the clad material C similar to the top-plate part 2, and the brazing material B is distribute | arranged to the inner surface side.

  As shown in FIG. 1, the bottom plate portion 31 has a substantially rectangular shape when viewed from the height direction Z, and the refrigerant guide formed in the thickness direction (height direction Z) through the portion constituting the protruding portion 11. An outlet 311 is provided. As shown in FIG. 6, the refrigerant guide / exhaust port 311 is connected to the refrigerant guide / exhaust pipe 5, and the refrigerant liquid can flow between the refrigerant flow path 12 and the refrigerant guide / exhaust pipe 5.

  Further, as shown in FIG. 5, the side wall portion 32 erected on the outer peripheral edge portion of the bottom plate portion 31 extends outward from the tip on the top plate portion 2 side (to the side opposite to the refrigerant flow path 12). The flange portion 321 is provided. The flange portion 321 is in contact with the top plate portion 2, and both are brazed and joined by the brazing material B of both the top plate portion 2 and the housing portion 3. Further, the outer peripheral edge of the flange portion 321 is bent toward the bottom plate portion 31 in the height direction Z, and the portion constituting the fixing portion 14 extends outward in the lateral direction Y from the end edge. Has been.

  As shown in FIG. 7, the heat sink portion 4 includes a plate-like base portion 41 and a heat radiating fin portion 42 erected from one surface of the base portion 41. In the heat sink part 4 of this example, a large number of heat radiating plates 420 constituting the radiating fin part 42 are arranged in the thickness direction (horizontal direction Y), and the cross section in the vertical direction X has a comb-like shape (see FIG. 5). It is a fin. Moreover, the heat sink part 4 is formed by extruding JIS6063 alloy.

  As shown in FIG. 5, the heat sink portion 4 is arranged so that the base portion 41 and the bottom plate portion 31 are in contact with each other, and the tip 421 of the heat radiating fin portion 42 and the top plate portion 2 are in contact with each other. In the heat sink part 4, the base part 41 and the bottom plate part 31 are brazed and joined by the brazing material B, and the tip of the heat radiation fin part 42 and the top plate part 2 are brazed and joined by the brazing material B.

  As shown in FIGS. 1 and 3, the central wall portion 13 disposed between the heat sink portions 4 has a substantially rectangular parallelepiped shape, and is formed of an aluminum alloy. Further, as shown in FIG. 5, the central wall portion 13 is in contact with the top plate portion 2 and the bottom plate portion 31 at both end surfaces in the height direction Z, and is brazed and joined by the brazing material B. Thereby, the area | region where the heat sink part 4 in the refrigerant | coolant flow path 12 is arrange | positioned is divided into the two flow path areas 120, and one heat sink part 4 is distribute | arranged to each flow path area | region 120. FIG.

  Although not shown in the drawing, both end surfaces in the longitudinal direction X of the central wall portion 13 are arranged at positions separated from the side wall portions 32 facing the respective end surfaces. Thereby, a communicating path is formed in the both ends in the vertical direction X of the heat exchanger 1, and the refrigerant liquid can be distributed between the two flow path regions 120 through the communicating path.

  Further, as shown in FIGS. 1 and 5, the central wall portion 13 of the present example has a depressed portion 131 formed by causing a central portion on the top surface on the top plate portion 2 side to be depressed in the height direction Z. . A central opening 22 is formed in a region corresponding to the depressed portion 131 in the top plate portion 2. Thereby, as shown in FIG.2 and FIG.3, the heat exchanger 1 of this example is provided with the center recessed part 15 which consists of the depression part 131 and the center opening part 22. FIG.

  As shown in FIG. 6, the refrigerant guide / exhaust pipe 5 includes a nipple part 51 connected to the refrigerant guide / exhaust port 311 and a pipe part 52 connected to the nipple part 51. As shown in FIG. 6, the nipple portion 51 includes a cylindrical nipple main body portion 510 and a flow path insertion portion 513 erected on one opening end 511 side of the nipple portion 51. The flow path insertion portion 513 is erected along the inner peripheral edge portion at one opening end 511 of the nipple main body portion 510, and has an outer diameter that is substantially the same as the opening diameter of the refrigerant guide / exhaust port 311.

  Moreover, as shown in FIG. 6, the baseplate part 31 and the nipple main-body part 510 are brazed and joined by the brazing sheet 7 interposed between both. The brazing sheet 7 is formed by laminating JIS4004 alloy on both sides of a plate material made of JIS6063 alloy. Further, the brazing sheet 7 is formed in a disc shape, and has a through hole 72 formed in the center thereof with the same opening diameter as that of the refrigerant inlet / outlet port 311. As shown in FIG. 6, the flow path insertion portion 513 is inserted and disposed in the through hole 72, and the nipple portion 51 and the bottom plate portion 31 are brazed and joined via the brazing sheet 7.

  Also, a female screw (not shown) is formed on the inner peripheral surface of the opening at the other opening end 512 of the nipple main body 510 shown in FIG. 6 so that the male screw of the pipe 52 can be fastened as will be described later. It is configured.

  The pipe portion 52 has a cylindrical shape, and an external thread is formed on an outer peripheral surface 520 (see FIG. 6) at one end thereof. Thereby, the male screw of the pipe part 52 and the female screw of the nipple part 51 are fastened, and the pipe part 52 and the nipple part 51 are connected as shown in FIG.

  In the heat exchanger 1 configured as described above, external pipes are connected to the pair of refrigerant guide / exhaust pipes 5, respectively, and the heating element is cooled as follows. First, when the refrigerant liquid is supplied from one refrigerant guide / discharge pipe 5, the refrigerant liquid flows into the communication path. Next, the refrigerant liquid is distributed by the central wall portion 13 and flows into each of the two flow path regions 120. Then, the refrigerant liquid that has flowed into each refrigerant flow path 12 circulates toward the other refrigerant guide / discharge pipe 5 side in the vertical direction X, and comes into contact with the radiating fin portion 42 inside the flow path. As a result, heat is exchanged with the radiating fin portion 42 to remove heat accumulated in the radiating fin portion 42. And the refrigerant | coolant liquid which reached | attained the communicating path by the side of the other refrigerant | coolant guiding / exhausting pipe 5 passes through the refrigerant | coolant guiding / exhausting pipe 5, and is discharged | emitted to external piping.

  Further, as described above, the heating element cooled by the heat exchanger 1 generates heat from various elements such as power semiconductor elements such as IGBTs, electronic parts such as reactors and capacitors, or power modules combining these elements. It can be mounted on the heating element mounting surface 21 as a body.

  Next, the function and effect of this example will be described. As shown in FIG. 5, in the heat exchanger 1, the heat sink portion 4 and the top plate portion 2 are brazed and joined. Therefore, the heat generated from the heating element is easily transferred from the heating element mounting surface 21 to the heat sink portion 4, and when the refrigerant liquid circulates in the refrigerant flow path 12, the space between the wall surface of the refrigerant flow path 12 and the refrigerant liquid. The heat exchange at is performed more efficiently. As a result, the refrigerant liquid can efficiently remove heat from the radiating fin portions 42, and thus the heat exchanger 1 has excellent heat radiating performance.

  The top plate 2 and the housing 3 are formed by pressing an aluminum plate as a material. Since the pressing of the plate material is a processing method that easily forms a thin member, the thickness of the top plate portion 2 and the housing portion 3 can be easily reduced. As a result, the heat exchanger 1 can be easily reduced in weight.

  In addition, by using an aluminum plate as the material for the top plate portion 2 and the housing portion 3, it is not necessary to use casting or forging in the production process of the main parts. Therefore, it becomes easy to shorten the manufacturing process of main components, and the productivity of the entire heat exchanger 1 can be easily improved.

  The aluminum plate constituting the top plate portion 2 and the housing portion 3 is made of the clad material C, and the brazing material B is disposed on at least the inner surface side of the heat exchanger 1. Therefore, by placing the top plate part 2 on the housing part 3 and melting the brazing material B with the heat sink part 4 in contact with the brazing material B of both the top plate part 2 and the bottom plate part 31, The brazing joint between the top plate portion 2 and the housing portion 3 and the brazing joint between the top plate portion 2 and the bottom plate portion 31 and the heat sink portion 4 can be performed at a time. As a result, the heat exchanger 1 is excellent in productivity.

  As shown in FIG. 6, the refrigerant guide / exhaust pipe 5 includes a nipple part 51 connected to the refrigerant guide / exhaust port 311 and a pipe part 52 connected to the nipple part 51. Therefore, the pipe part 52 can be connected to the nipple part 51 after the nipple part 51 is brazed and joined. As a result, since it is not necessary to consider the shape of the pipe part 52 at the time of brazing joining, the shape of the pipe part 52 can be selected more freely.

  Moreover, as shown in FIG. 6, the baseplate part 31 and the nipple part 51 are brazed and joined by the brazing sheet 7 interposed between both. Therefore, a sufficient amount of brazing material is supplied between the nipple portion 51 and the brazing sheet 7 during brazing joining. As a result, the bottom plate portion 31 and the nipple portion 51 can be more reliably joined.

  Further, as shown in FIG. 7, a heat sink portion 4 including a plate-like base portion 41 and a radiating fin portion 42 erected from one surface of the base portion 41 is used. Therefore, the dimensional accuracy of the heat sink part 4 can be easily increased. Further, since the heat sink portion 4 can be aligned with the base portion 41 when it is arranged in the refrigerant flow path 12, it is easy to reduce the displacement in the refrigerant flow path 12. As a result, the heat exchanger 1 using the heat sink part 4 can easily reduce the flow resistance of the refrigerant liquid, and can easily improve the heat dissipation performance.

  Further, as shown in FIG. 5, the base portion 41 and the bottom plate portion 31 are brazed and joined by the brazing material B, and the tip 421 of the radiating fin portion 42 and the top plate portion 2 are brazed and joined by the brazing material B. Yes. Thereby, since only the top plate portion 2 is disposed between the refrigerant flow path 12 and the heating element mounting surface 21, it is easy to reduce the thickness of the metal between the refrigerant flow path 12 and the heating element mounting surface 21. Thus, the thermal resistance can be reduced. As a result, the heat dissipation performance of the heat exchanger 1 can be further improved.

  In addition, as shown in FIG. 5, the refrigerant flow path 12 is partitioned into a plurality of flow path areas 120 by a central wall portion 13 disposed between the top plate portion 2 and the bottom plate portion 31, so Each heat sink 4 is disposed in the road region 120. Therefore, the heat exchanger 1 is suitable for cooling the heating elements arranged in a plurality of rows. In addition, the plurality of flow channel regions 120 can have an appropriate range for making the flow velocity distribution of the refrigerant liquid flowing through the individual flow channel regions 120 uniform. As a result, the refrigerant liquid can easily come into uniform contact with the entire heat sink portion 4, so that heat can be uniformly radiated from the entire heat sink portion 4. As a result, the heat exchanger 1 can cool a plurality of heating elements uniformly.

  In addition, as shown in FIGS. 1, 3, and 5, the heat exchanger 1 of the present example has a central concave portion 15 including a central opening 22 of the top plate portion 2 and a recessed portion 131 of the central wall portion 13. It is arrange | positioned at the board part 2 side. Therefore, for example, when a part of the devices arranged in the peripheral part of the heat exchanger 1 protrudes toward the heat exchanger 1, the protruding part can be accommodated in the central recess 15. As a result, the arrangement space can be easily secured and the dead space can be reduced.

  As described above, the heat exchanger 1 is excellent in heat dissipation, is small and lightweight, and has excellent productivity.

In addition, in this example, although the base part 41 was brazed and joined to the bottom plate part 31, and the radiating fin part 42 was brazed and joined to the top plate part 2, the base part 41 and the radiating fin part 42 were shown. A configuration in which the arrangement is reversed is also possible. That is, in this example, a configuration in which the base portion 41 is brazed and joined to the top plate portion 2 is also possible. In this case, the tips of the radiating fin portions 42 may be brazed to the bottom plate portion 31 or may be arranged apart from the bottom plate portion 31.
Moreover, in this example, although the center recessed part 15 was arrange | positioned at the top-plate part 2 side, the center recessed part 15 can also be arrange | positioned at the baseplate part 31 side.

( Example 1 )
This example is an example of the heat exchanger 102 that does not use the nipple portion 51 in Reference Example 1 . As shown in FIGS. 8 and 9, the pair of refrigerant introduction / exhaust ports 311 in the heat exchanger 102 of this example includes a cylindrical collar portion 312 erected outward from the bottom plate portion 31. The brazing material B is arranged on the inner peripheral surface of the collar portion 312. Then, as shown in FIG. 9, one end of the refrigerant guide / exhaust pipe 502 inserted into the collar portion 312 is brazed and joined with the brazing material B.

  In this example, the collar portion 312 erected on the bottom plate portion 31 is formed by forming a through hole in a region where the refrigerant introduction / exhaust port 311 is arranged in press processing and then performing burring processing on the through hole. Has been. As a result, as shown in FIG. 9, the brazing material B disposed on the bottom plate portion 31 extends to the inner peripheral surface of the collar portion 312.

Further, as shown in FIG. 9, the refrigerant guide / exhaust pipe 502 of this example uses a cylindrical pipe having an outer diameter substantially the same as the opening diameter of the collar portion 312. Others are the same as in Reference Example 1 . Of the reference numerals used in FIGS. 8 and 9, the same reference numerals as those used in Reference Example 1 represent the same components as in Reference Example 1 unless otherwise indicated.

When one end of the refrigerant guide / exhaust tube 502 inserted into the collar portion 312 is brazed and joined by the brazing material B in the collar portion 312 as in this example, the coolant guide / exhaust tube 502 and the bottom plate portion are joined. It is not necessary to prepare a separate brazing material for brazing and joining to 31. Further, the brazing joining between the refrigerant guide / exhaust pipe 502 and the bottom plate portion 31 can be performed simultaneously with the brazing joining of the heat sink portion 4. As a result, the heat exchanger 102 is more productive. In addition, the same effects as those of Reference Example 1 can be achieved.

( Reference Example 2 )
This example is an example of the heat exchanger 103 using the corrugated plate 43 in place of the heat sink portion 4 having the base portion 41 and the radiation fin portion 42 in the reference example 1 . As shown in FIG. 10, the heat exchanger 103 of this example uses a corrugated plate 43 whose cross section in the longitudinal direction X has a waveform as the heat sink portion 4. The corrugated plate 43 is made of an aluminum alloy, and has a shape that extends in the longitudinal direction X while maintaining the corrugated cross-sectional shape shown in FIG. Then, the apex of the one surface 430 of the corrugated plate 43 and the top plate portion 2 are brazed and joined by the brazing material B, and the apex of the other surface 431 and the bottom plate portion 31 are brazed and joined by the brazing material B. . Others are the same as in Reference Example 1 . Of the reference numerals used in FIG. 10, the same reference numerals as those used in Reference Example 1 represent the same components as in Reference Example 1 unless otherwise indicated.

  In this example, a corrugated plate 43 having a corrugated cross section is adopted as the heat sink portion 4, and the apex of one surface 430 of the corrugated plate 43 and the top plate portion 2 are brazed and joined. As described above, since the corrugated plate 43 can be easily reduced in thickness, the contact area with the refrigerant liquid can be increased with a relatively small amount of material. As a result, the heat exchanger 103 can be easily reduced in weight and its heat dissipation performance can be further improved.

Further, in this example, the apex of the other surface 431 of the corrugated plate 43 and the bottom plate portion 31 are brazed and joined. Thereby, since the corrugated board 43 is more firmly joined with respect to the top-plate part 2 and the baseplate part 31, the corrugated board 43 can be made difficult to deform | transform. In addition, the same effects as those of Reference Example 1 can be achieved.

( Reference Example 3 )
This example is an example of a heat exchanger 104 using an extruded multi-hole tube 44 instead of the heat sink part 4 having the base part 41 and the heat radiation fin part 42 in Reference Example 1 . The extruded multi-hole tube 44 of this example is an aluminum alloy extruded material formed by extrusion processing, and as shown in FIG. 11, the cross section in the extrusion direction (longitudinal direction X) has a rectangular shape, and the inside Have a plurality of refrigerant flow holes 440. And as shown in FIG. 11, the both end surfaces in the height direction Z of the extruded multi-hole tube 44 are in contact with the top plate portion 2 or the bottom plate portion 31 respectively, and both the top plate portion 2 and the bottom plate portion 31 are brazed. The material B is brazed and joined. Others are the same as in Reference Example 1 . Of the reference numerals used in FIG. 11, the same reference numerals as those used in Reference Example 1 represent the same components as in Reference Example 1 unless otherwise indicated.

In this example, as the heat sink portion 4, an extruded multi-hole tube 44 formed by extrusion and having a plurality of refrigerant circulation holes 440 therein is adopted. The extruded multi-hole tube 44 is both the top plate portion 2 and the bottom plate portion 31. And brazing material B. As described above, since extrusion molding is a processing method with excellent productivity, the extruded multi-hole tube 44 has excellent productivity. As a result, the productivity of the entire heat exchanger 104 can be easily improved. Furthermore, since the length of the extruded multi-hole tube 44 can be freely selected, the heat exchanger 104 can be easily changed in design such as a change in cooling capacity. In addition, the same effects as those of Reference Example 1 can be achieved.

In addition, brazing joining using the brazing material B and the brazing sheet 7 in Example 1 and Reference Examples 1 to 3 may be performed using a flux or may be performed without using a flux. When a flux is used, a known flux used for brazing aluminum can be employed. Moreover, when not using a flux, the vacuum brazing method which brazes in a vacuum atmosphere, for example can be employ | adopted.

Moreover, although Example 1 and Reference Examples 1-3 showed the example which used JIS6063 alloy as the core material A, the material of the core material A is not limited to this, For example, corrosion resistance, such as JIS3003 alloy, is favorable. It is also possible to use a simple material.

( Reference Example 4 )
In this example, the heat exchanger 1 in Reference Example 1 is brazed in an inert gas atmosphere without using a flux. In the heat exchanger 1 of this example, a clad material C laminated in two or three layers having various chemical components shown in Table 1 is used as a material for the top plate portion 2 and the housing portion 3.

  As the two-layer clad material, a material in which the overall thickness was 1 mm and the brazing material B was laminated on one side of the core material A with a clad rate of 10% (thickness 0.1 mm) was used. In addition, the three-layer clad material used was an overall thickness of 1 mm, and the intermediate material I and the brazing material B were laminated in this order on one side of the core material A. The clad rate of the intermediate material I at this time was 5% (thickness 0.05 mm), and the clad rate of the brazing material B was 10% (thickness 0.1 mm). These clad materials can be produced by appropriately combining hot rolling, cold rolling and heat treatment.

In this example, 29 kinds of clad materials C are produced by combining the core material A, the brazing material B, and the intermediate material I having the chemical components shown in Table 1, and the heat shown in Table 1 using each clad material C. The exchanger 1 (test body No.1-No.29) was produced. In addition, the brazing sheet 7 has a test body No. shown in Table 1 on both surfaces of a plate material made of JIS6063 alloy. A laminate of the brazing material B used in 1 was used. Others are the same as in Reference Example 1 .

The brazing joining in this example was performed by the following procedure using a two-chamber type nitrogen gas furnace provided with a preheating chamber and a brazing chamber. The internal volume of each of the preheating chamber and the brazing chamber was 0.4 m ³ .

First, the heat exchanger 1 is placed in a brazing chamber of a nitrogen gas furnace, and nitrogen gas is fed into each chamber of the nitrogen gas furnace at a flow rate of 20 m ³ / h, and brazing is performed so that the ultimate temperature becomes 595 ° C. The room was heated. At this time, the time required for the temperature in the brazing chamber to reach 595 ° C. from 450 ° C. was about 12 minutes.

  After the temperature in the brazing chamber reached 595 ° C., the heating was terminated when the temperature of the heat exchanger 1 reached 595 ° C., and the heat exchanger 1 was moved to the preheating chamber. At this time, the oxygen concentration in the brazing chamber was 7 to 17 ppm. Next, after the heat exchanger 1 was cooled to 550 ° C. in the preheating chamber, it was taken out from the nitrogen gas furnace and cooled in the atmosphere.

  About each heat exchanger 1 produced as mentioned above (test body No.1-No.29), the fillet of the brazing junction part was observed visually and with the stereomicroscope. Furthermore, a substantially central portion of the heat exchanger 1 was cut to expose a cross section perpendicular to the vertical direction X, and the cross section was observed using a stereomicroscope.

Table 1 shows the results of observation of the fillet and the cross section. In addition, the symbol described in the column of the observation result in Table 1 has shown the following states.
A: A state in which a uniform fillet is formed over the entire length of the brazed joint B: A state in which a uniform fillet is formed over the entire length of the brazed joint, and the formed fillet is slightly smaller than A. C: Fillet Is formed, and there is a place where brazing is not performed. D: A state where there is a trace of dissolution in at least a part of the radiating fin portion E: A state where erosion to the core material A or the intermediate material I can be confirmed F: Cladding A condition where cracks occurred during rolling of material C and could not be produced

  As known from Table 1, the test specimen No. 1-No. In all cases, it was confirmed that a uniform fillet was formed over the entire length of the brazed joint, and a sound brazed joint was made.

  Specimen No. No. 22 had a portion where no fillet was formed because the Si content of the brazing material B was too small.

  Specimen No. In No. 23, since the Si content of the brazing material B was too large, traces of dissolution in the radiating fin portion were observed.

  Specimen No. 24 and no. In No. 25, since the Li content of the brazing material B was outside the above specific range, there was a portion where no fillet was formed.

  Specimen No. In No. 26, since the Mg content of the core material A was too large, it was confirmed that the core material A was subjected to erosion.

  Specimen No. 27 and no. In No. 29, since the Mn content of the core material A or the intermediate material I was too large, cracks occurred when the clad material C was rolled, and could not be produced.

  Specimen No. In No. 28, since the Mg content of the intermediate material I was too large, it was confirmed that the intermediate material I was subjected to erosion.

In Example 1 and Reference Examples 1 to 4 , an example in which the coolant channel 12 is partitioned into two channel regions 120 by the central wall portion 13 is shown, but a plurality of rows of heating elements are provided on the heating element mounting surface 21. When it is not necessary to mount, it is possible to employ a configuration in which the coolant passage 12 is not divided into a plurality of passage regions 120 without using the central wall portion 13.

Moreover, in Example 1 and Reference Examples 1-4 , although the example which used JIS6063 alloy for the material of the heat sink part 5 was shown, other alloys can also be used, for example, JIS1050 alloy can also be used. .

DESCRIPTION OF SYMBOLS 1, 102, 103, 104 Heat exchanger 12 Refrigerant flow path 2 Top plate part 21 Heating body mounting surface 3 Housing part 31 Bottom plate part 311 Refrigerant inlet / outlet 32 Side wall part 4 Heat sink part 5, 502 Refrigerant inlet / outlet pipe A Heart material B Brazing material C Clad material

Claims (16)

A top plate having a heating element mounting surface on the outer surface for mounting the heating element;
A housing portion having a bottom plate portion, a side wall portion erected from an outer peripheral edge portion of the bottom plate portion, and a cylindrical collar portion erected outward from the bottom plate portion ;
A heat sink portion disposed in a refrigerant flow path surrounded by the top plate portion and the housing portion;
A pair of refrigerant inlets and outlets disposed in the collar portion and communicating with the refrigerant flow path;
A pair of refrigerant conduits inserted into the collar portion and connected to the pair of refrigerant conduits ;
Upper Kitenban portion and the housing portion is formed an aluminum plate by pressing,
The aluminum plate is made of a clad material composed of a core material and a brazing material laminated on at least the inner surface side of the core material, and the brazing material has a lower melting point than the core material and is made of a material constituting the heat sink part. Has a low melting point,
By the brazing material, the top plate portion and the housing portion are brazed and joined, and the heat sink portion is brazed and joined to at least the top plate portion ,
The brazing material provided on the inner peripheral surface of the collar part in the housing part is characterized in that the collar part and one end of the refrigerant guide / exhaust pipe inserted into the collar part are brazed and joined. Heat exchanger.   The heat exchanger according to claim 1, wherein the refrigerant guide / exhaust pipe includes a nipple portion connected to the refrigerant guide / exhaust port and a pipe portion connected to the nipple portion. vessel.   3. The heat exchanger according to claim 1, wherein the heat sink portion includes a plate-like base portion and a radiating fin portion erected from one surface of the base portion. vessel.   4. The heat exchanger according to claim 3, wherein the base portion and the bottom plate portion are brazed and joined by the brazing material, and a tip of the radiating fin portion and the top plate portion are brazed and joined by the brazing material. A heat exchanger characterized by that.   3. The heat exchanger according to claim 1, wherein the heat sink portion is a corrugated plate having a corrugated cross section, and at least a vertex of one surface of the corrugated plate and the top plate portion are brazed by the brazing material. A heat exchanger characterized by being joined together.   The heat exchanger according to claim 1 or 2, wherein the heat sink portion is an extruded multi-hole tube formed by extrusion processing and having a plurality of refrigerant circulation holes therein, and the extruded multi-hole tube is formed by the brazing material. A heat exchanger characterized by being brazed and joined to both the top plate and the bottom plate.   The heat exchanger according to any one of claims 1 to 6, wherein the refrigerant flow path is partitioned into a plurality of flow path areas by a central wall portion disposed between the top plate portion and the bottom plate portion. A heat exchanger, wherein a heat sink is provided in each of the plurality of flow path regions.   The heat exchanger according to any one of claims 1 to 7, wherein the core material in the top plate part and the housing part contains Mg: 1.3% (mass%, the same applies hereinafter) or less, The brazing material has a chemical component composed of the remaining Al and inevitable impurities, and the brazing material contains Si: 6 to 13%, Li: 0.004 to 0.1%, and consists of the remaining Al and inevitable impurities. The heat exchanger characterized by having.   The heat exchanger according to claim 8, wherein the core material further includes Mn: 0.05 to 1.8%, Si: 1.0% or less, Fe: 1.0% or less, Cu: 0.9% or less. Zn: 6.5% or less, Ti: 0.2% or less, Zr: containing one or more chemical components selected from the group consisting of 0.5% or less Heat exchanger.   The heat exchanger according to any one of claims 1 to 9, wherein the clad material constituting the top plate portion and the housing portion is formed by stacking an intermediate material between the core material and the brazing material. The intermediate material contains Mg: 1.3% or less, has a chemical component composed of the balance Al and inevitable impurities, and the brazing material is Si: 6-13%, Li: 0.004 A heat exchanger comprising -0.1% and having a chemical component consisting of the balance Al and inevitable impurities.   The heat exchanger according to claim 10, wherein the intermediate material further includes Mn: 0.05 to 1.8%, Si: 1.0% or less, Fe: 1.0% or less, Cu: 0.9% Hereinafter, it is characterized by containing one or more chemical components selected from the group consisting of Zn: 6.5% or less, Ti: 0.2% or less, and Zr: 0.5% or less. Heat exchanger.   The heat exchanger according to claim 10 or 11, wherein the core material contains Mn: 0.05 to 1.8% and has a chemical component composed of the balance Al and inevitable impurities. Heat exchanger.   The heat exchanger according to claim 12, wherein the core material further includes Si: 1.0% or less, Fe: 1.0% or less, Cu: 0.9% or less, Zn: 6.5% or less, Ti: A heat exchanger comprising one or more chemical components selected from the group consisting of 0.2% or less and Zr: 0.5% or less.   14. The heat exchanger according to claim 8, wherein the brazing material is further selected from the group consisting of Bi: 0.004 to 0.2% and Mg: 0.05 to 0.4%. A heat exchanger characterized by containing one or two kinds of chemical components.   The heat exchanger according to any one of claims 8 to 14, wherein the brazing material is further selected from the group consisting of Sr: 0.002 to 0.05% and Sb: 0.003 to 0.07%. A heat exchanger characterized by containing one or two kinds of chemical components.   The heat exchanger according to any one of claims 8 to 15, wherein the brazing material further includes Fe: 0.05 to 0.8%, Mn: 0.05 to 0.2%, Ti: 0.00. A heat exchanger comprising one or more chemical components selected from the group consisting of 01 to 0.15%.

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