JP2013219126A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small and light heat exchanger having a housing portion with excellent productivity.SOLUTION: A heat exchanger 1 comprises: a housing portion 2 comprising a tubular cooling tube portion 3, and a plate-like plate portion 20 extending from an outer periphery of the cooling tube portion 3; a heat sink portion 4 arranged at a notch opening 30 provided by cutting one part of the cooling tube portion 3; and joint portions 5 jointed to both ends in a longitudinal direction of the cooling tube portion 3. The heat sink portion 4 comprises a plate-like base portion 40 having a heating element mounting face 400, and a radiation fin portion 41 standing from a face opposite to the heating element mounting face 400 of the base portion 40. While the radiation fin portion 41 is inserted in the cooling tube portion 3, the base portion 40 and a peripheral edge of the notch opening 30 of the cooling tube portion 3 are jointed to each other. The housing portion 2 is formed by extrusion molding to integrally include the cooling tube portion 3 and the plate portion 20. At least one of the plural joint portions is formed by processing a longitudinal end of the cooling tube portion 3.

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 arranging fin portions of the heat sink in a flow path through which the coolant flows. For example, Patent Documents 1 to 3 propose a heat exchanger in which a flow path 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. These heat exchangers are configured by joining the upper case and the lower case in a state where the fin portion of the heat sink is disposed in the 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 material.

JP 2001-313357 A JP 2009-135477 A JP 2010-69503 A

  Conventionally, the housing part that receives the heat sink has a substantially rectangular parallelepiped shape like the lower case disclosed in Patent Documents 1 to 3, and the flow path provided in the housing part is formed by providing a recess on one surface of the housing part. ing. In addition, at both ends of the flow path, a communication path that communicates the outside of the lower case and the flow path is provided.

  As a method for forming a conventional housing portion having such a shape, 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 is intended to provide a heat exchanger having a housing portion that is small and light and has excellent productivity.

One aspect of the present invention is a housing part including a tubular cooling pipe part and a plate-like plate part extended from the outer peripheral surface of the cooling pipe part,
A heat sink disposed in a notch opening provided by cutting out a part of the cooling pipe, and
A plurality of joint portions disposed at both ends in the longitudinal direction of the cooling pipe portion;
The heat sink part includes a plate-like base part having a heating element mounting surface for mounting the heating element, and a radiation fin part standing from a surface opposite to the heating element mounting surface in the base part. And the base part and the periphery of the notch opening part of the cooling pipe part are joined in a state where the radiating fin part is inserted into the cooling pipe part,
The housing part is formed by extrusion so as to integrally include the cooling pipe part and the plate part,
At least one of the plurality of joint portions is formed in the heat exchanger by processing an end portion in the longitudinal direction of the cooling pipe portion (Claim 1).

  The heat exchanger is arranged in a state in which the radiating fin portion in the heat sink portion is inserted into the cooling pipe portion, and the base portion and the periphery of the notch opening portion of the cooling pipe portion are joined. ing. Thereby, when a refrigerant liquid distribute | circulates inside the said cooling pipe, the said radiation fin part is comprised so that the said refrigerant liquid may be contacted. As a result, since the refrigerant liquid can efficiently remove heat from the heat radiating fins, the heat exchanger has excellent heat radiating performance.

  Further, the housing part is formed by extrusion so as to integrally include the cooling pipe part and the plate part. Extrusion molding is a processing method that easily forms a thin member, and therefore the thickness of the cooling pipe portion and the plate portion can be easily reduced. Further, since the extrusion molding is a processing method excellent in mass productivity, the housing part is excellent in productivity. Furthermore, since the length of the cooling pipe portion can be freely selected, design changes such as changes in the cooling capacity are facilitated.

  Further, at least one of the plurality of joint portions is formed by processing an end portion in the longitudinal direction of the cooling pipe portion. Thereby, the shape of the joint portion is greatly deformed from the shape by the extrusion molding, and it becomes easy to match the external piping from the outside of the heat exchanger. As a result, since the number of joint parts prepared separately from the housing part can be reduced, the number of parts can be reduced.

  As described above, according to the above aspect, it is possible to provide a heat exchanger having a housing portion that is small and light and has excellent productivity.

The perspective view of the heat exchanger in Example 1. FIG. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1. FIG. 3 is a component development view of the heat exchanger according to the first embodiment. FIG. 3 is a perspective view of an extruded profile that is a basic shape of a housing portion in the first embodiment. The perspective view of the state which formed the notch opening part in the extruded shape material in Example 1. FIG. The perspective view of the housing part in Example 1 (The perspective view of the state which formed the communication port by plastically processing the both ends of an extrusion shape member). FIG. 3 is a perspective view of a heat sink portion in the first embodiment. The perspective view of the heat exchanger which joined the distribution pipe formed in the different body in Example 2 to the edge part of the one side of a cooling pipe part. FIG. 6 is a development view of parts of the heat exchanger according to the second embodiment. The perspective view of the square tube used as the basic shape of the distribution pipe in Example 2. FIG. The perspective view of the state which formed the refrigerant | coolant circulation hole in the square tube in Example 2. FIG. The perspective view of the distribution pipe in Example 2 (the perspective view of the state which formed the connection port in the square tube). FIG. 9 is a perspective view of a heat exchanger having one cooling pipe part in Example 3. FIG. 6 is a component development view of a heat exchanger in the third embodiment.

  In the heat exchanger, as described above, at least one of the plurality of joint portions is formed by processing the end portion in the longitudinal direction of the cooling pipe portion. That is, the end portion of the cooling pipe portion formed by extrusion molding is formed into a shape that functions as a joint portion by further processing at least one portion. In addition, you may join the joint part prepared separately from the said housing part to the edge part which does not receive an additional process as mentioned above among the edge parts of the said cooling pipe part. At this time, a known joining method such as welding or joining with an adhesive can be employed for joining the joint part prepared separately and the both end parts of the cooling pipe part.

  Here, the joint part is a part that connects the refrigerant flow path formed in the cooling pipe part and the external pipe, and has a structure in which a simple connection port (nipple part) is provided, or a plurality of cooling pipe parts. Various configurations such as a structure in which a header portion that communicates with the open end and collects a plurality of flow paths into one, or a structure in which both a communication port and a header portion are provided can be employed.

The heat exchanger may include a plurality of the cooling pipe parts, and the plurality of cooling pipe parts may be connected to each other via the plate part.
In this case, it is suitable for cooling the heating elements arranged in a plurality of rows. In addition, the plurality of cooling pipe portions can have an appropriate range for making the flow velocity distribution of the refrigerant liquid flowing through the individual cooling pipe portions uniform. Thereby, since it becomes easy for a refrigerant | coolant liquid to contact the said whole radiation fin part uniformly, it becomes possible to thermally radiate heat uniformly from the said whole radiation fin part. As a result, the heat exchanger can cool a plurality of heating elements uniformly.

  In this case, a recess may be provided by the plurality of cooling pipe portions and a plate portion connecting them. In this case, even if a part of the devices arranged in the peripheral portion of the heat exchanger protrudes toward the heat exchanger, the protruding portion can be accommodated in the recess, thereby reducing dead space. can do. In addition, a heating element can be mounted in the recess. In this recess, heat generated from the heating element is conducted to the wall surface of the cooling pipe part via the plate part constituting the recess, and heat exchange can be performed with the refrigerant liquid flowing through the cooling pipe part. As a result, it becomes possible to cool the heating element mounted in the recess.

Further, the base part and the periphery of the notch opening part of the cooling pipe part may be joined by brazing or friction stir welding (Claim 3).
In this case, it becomes easy to join the base portion and the peripheral edge of the notch opening so that there is no unjoined portion. Therefore, the leakage of the refrigerant liquid from the joint portion between the base portion and the cooling pipe portion can be prevented. In addition, a well-known joining method, such as friction stir welding, welding, and joining by an adhesive agent, can also be employed for joining the base part and the cooling pipe part.

Example 1
An embodiment of the heat exchanger will be described with reference to FIGS. As shown in FIGS. 1 and 4, the heat exchanger 1 includes a housing part 2 including a tubular cooling pipe part 3 and a plate-like plate part 20 extending from the outer peripheral surface of the cooling pipe part 3; A heat sink part 4 disposed in a notch opening 30 provided by cutting out a part of the cooling pipe part 3, and a plurality of joint parts arranged at both ends in the longitudinal direction of the cooling pipe part 3 ing. As shown in FIG. 8, the heat sink portion 4 is erected from a plate-like base portion 40 having a heating element mounting surface 400 for mounting a heating element, and a surface of the base portion 40 opposite to the heating element mounting surface 400. And a pin-shaped radiating fin portion 41. As shown in FIGS. 2 and 3, the heat sink part 4 has a base part 40 and a peripheral edge of the notch opening part 30 of the cooling pipe part 3 in a state where the radiating fin part 41 is inserted into the cooling pipe part 3. It is joined. Moreover, as shown in FIGS. 5-7, the housing part 2 is formed by extrusion so that the cooling pipe part 3 and the plate part 20 may be provided integrally. At least one of the plurality of joint portions is formed by processing an end portion in the longitudinal direction of the cooling pipe portion 3 as shown in FIG. Hereinafter, the longitudinal direction of the cooling pipe portion 3 is referred to as “longitudinal direction X”.

  As shown in FIG. 7, the housing part 2 of the heat exchanger 1 includes two cooling pipe parts 3 formed in a substantially rectangular tube, and three plates extending from the outer peripheral surface of these cooling pipe parts 3. Part 20. The two cooling pipe portions 3 are arranged in parallel with each other at intervals in a direction orthogonal to the longitudinal direction X (hereinafter, the arrangement direction of the cooling pipe portions 3 is referred to as “width direction Y”). Further, the three plate portions 20 are disposed between the two cooling pipe portions 3 and on the outer side in the arrangement direction (width direction Y) of the cooling pipe portions 3. The outer peripheral surfaces facing each other in the arrangement direction (width direction Y) of the cooling pipe portions 3 are connected to each other via the plate portion 20.

  Further, as shown in FIG. 7, the two cooling pipe portions 3 are perpendicular to both the longitudinal direction X and the width direction Y with respect to the plate portion 20 (hereinafter, this direction is referred to as “height direction Z”). .), And the other side in the height direction Z is arranged such that the plate portion 20 and the outer peripheral surface of the cooling pipe portion 3 are flush with each other. Accordingly, the outer peripheral surfaces of the two cooling pipe portions 3 facing each other and the plate portion 20 connecting them constitute a concave portion 21.

  Further, as shown in FIG. 7, a substantially rectangular cutout opening 30 is formed on one side of each cooling pipe portion 3 in the height direction Z. Further, as shown in FIGS. 2 and 3, a step portion 31 having a lower height than the outside is formed inside the notch opening 30. The heat radiating fin portion 41 of the heat sink portion 4 is inserted into the cutout opening 30 and the periphery of the base portion 40 is fitted to the step portion 31. Thereby, the heating element mounting surface 400 of the heat sink portion 4 and the outer peripheral surface of the periphery of the heat sink portion 4 in the cooling pipe portion 3 are arranged flush with each other.

  As shown in FIG. 7, communication ports 5 serving as joint portions are formed at both ends of each cooling pipe portion 3 and have a shape different from the shape by extrusion molding. The communication port 5 is formed in a substantially cylindrical shape by performing plastic working on a substantially rectangular tubular cross section of the cooling pipe portion 3.

  As shown in FIG. 8, the heat sink part 4 includes a substantially rectangular base part 40 and a heat radiation fin part 41 erected in the height direction Z from the base part 40. The surface opposite to the surface on which the heat radiating fins 41 are formed constitutes a heating element mounting surface 400 on which the heating element is mounted.

  As shown in FIG. 8, the heat dissipating fin portion 41 is configured by standing a large number of cylindrical pins 410. In addition, the area where the pin 410 is erected is smaller than the opening area of the notch opening 30 so that the radiating fin part 41 can be inserted and arranged in the notch opening 30 of the housing part 2 as described above. It is formed to become. Further, the height of the pin 410 in the radiating fin portion 41 is formed to be slightly smaller than the inner dimension in the height direction Z of the cooling pipe portion 3. Thus, as shown in FIGS. 2 and 3, the tip of the pin 410 is configured to be disposed in the vicinity of the inner wall of the cooling pipe portion 3 in a state where the radiating fin portion 41 is inserted and disposed. As the clearance between the tip of the pin 410 and the inner wall of the cooling pipe portion 3 is smaller, the heat dissipation can be improved. Therefore, the clearance between the tip of the pin 410 and the inner wall of the cooling pipe portion 3 is preferably 0.5 mm or less, and a configuration in which the tip of the pin 410 abuts against the inner wall of the cooling pipe portion 3 is particularly preferable.

  Further, the base portion 40 at the periphery of the heat radiating fin portion 41 is formed flat. Thereby, in the state where the radiating fin portion 41 is inserted and arranged, as shown in FIGS. 2 and 3, the step portion 31 formed in the notch opening 30 and the base portion 40 are configured to be fitted. Yes. Moreover, as shown in FIG.2 and FIG.3, the notch opening 30 periphery and the base part 40 are joined by friction stir welding.

  Next, the manufacturing method of the heat exchanger 1 is demonstrated. The manufacture of the heat exchanger 1 includes a housing part forming process for forming the housing part 2 and a heat sink part forming process for forming the heat sink part 4. And the heat exchanger 1 is obtained by performing the assembly process which joins the housing part 2 and the heat sink part 4 which were obtained by these each process by a well-known joining method.

  The housing part forming process includes an extrusion process for forming the extruded shape member 200 that is the basic shape of the housing part 2, an opening forming process for forming the notched opening 30 in the extruded shape member 200 obtained by the extrusion process, and a cooling process. And a terminal processing step for forming connection ports 5 as joint portions at both ends of the tube portion 3. In the extruding step, the cooling pipe portion 3 and the plate portion 20 are integrally formed by hot or cold extruding an aluminum billet. In this example, a billet of 6063 materials is hot-extruded to obtain an extruded shape member 200 in which two cooling pipe portions 3 and three plate portions 20 are connected as shown in FIG. It was.

  In the opening forming step, cutting is performed on the extruded shape member 200 obtained by the extrusion step. Thereby, the notch opening 30 was formed in the extruded shape member 200 as shown in FIG. In addition, in this opening part formation process, although the step part 31 was formed in the periphery with the notch opening part 30, description of the step part 31 to FIG. 6 was abbreviate | omitted for convenience.

  In the terminal processing step, the end portion of the cooling pipe portion 3 in the extruded shape member 200 is subjected to plastic working such as press molding, thereby deforming the end portion of the cooling pipe portion 3 into a cylindrical shape and forming the communication port 5. . In this example, first, both end portions in the width direction Y in the plate portion 20 of the extruded shape member 200 were removed by punching or the like. Next, a connecting port 5 was formed by press-fitting a substantially conical shaped plug into both end portions of the cooling tube portion 3 to plastically deform both end portions from a substantially square tube shape to a cylindrical shape. Thus, the housing part 2 shown in FIG. 7 was obtained.

  In the heat sink portion forming step, the heat sink portion 4 is formed by various methods such as casting and forging. In this example, the heat sink part 4 shown in FIG. 8 was obtained by hot forging an aluminum alloy material having specific chemical components and specific mechanical characteristics described later.

  Hereinafter, the heat sink part forming step will be described in detail. In this example, the chemical composition is Si: 0.2% (mass%, the same applies hereinafter) to 1.0%, Mg: 0.4% to 1.0%, Fe: 0.35% or less. A forging block was prepared, which was made of an aluminum alloy material containing a balance of unavoidable impurities and 98% or more of aluminum and having a proof stress of 120 MPa or more. Next, the forging block was heated to 500 ° C., the forging die was heated to 150 ° C., and hot forged by a friction press.

  The temperature of the heat sink part 4 immediately after the hot forging was 330 ° C. when taken out from the mold. The heat sink 4 was placed in the atmosphere and allowed to cool (outside of the furnace) to cool to room temperature. In this example, the cooling was performed under the condition that the cooling rate during the cooling period from 300 ° C. to 50 ° C. was 0.45 ° C./sec.

After cooling the heat sink part 4 to room temperature, a heat treatment (artificial aging treatment) was performed at 200 ° C. for 4 hours.
Thereafter, deburring was performed, and shot blasting was performed to remove scale.
Then, the surface (heating element mounting surface 400) opposite to the surface on which the heat dissipating fin portion 41 is disposed in the base portion 40 is cut, and further, the peripheral edge of the heat dissipating fin portion 41 is lightly chamfered to obtain FIG. The heat sink shown was obtained.

  In the assembly process, the housing part 2 and the heat sink part 4 obtained as described above are joined by a known joining method to obtain the heat exchanger 1 shown in FIG. In this example, the base 40 in the heat sink 4 and the periphery of the notch opening 30 in the housing 2 are joined by friction stir welding. Specifically, as shown in FIG. 4, the heat sink portion 4 is inserted into the cutout opening 30 with the radiating fin portion 41 facing the cooling pipe portion 3, and the peripheral portion of the base portion 40 is cut out through the cutout opening. It was made to contact 30 steps. Thereafter, the rotary tool was press-fitted into one point on the boundary line between the heat sink part 4 and the notch opening 30, and the rotary tool was made to make one turn along this boundary line. As a result, the stirring region 502 shown in FIGS. 2 and 3 was formed along the boundary line described above, and the base portion 40 and the cooling pipe portion 3 were joined to obtain the heat exchanger 1 shown in FIG.

  In the heat exchanger 1 configured as described above, a refrigerant introduction pipe as an external pipe is connected to the communication port 5 on one end side in each cooling pipe portion 3, and a refrigerant outlet pipe is connected to the communication port 5 on the other end side. Connected. And heat exchange is performed as follows. First, the refrigerant liquid flows into each cooling pipe portion 3 from the refrigerant introduction pipe through the communication port 5 on one end side. In the cooling pipe portion 3, the refrigerant liquid circulates toward the communication port 5 on the other end side, and at the same time, exchanges heat with the radiating fin portion 41 that is in contact with it, and heat accumulated in the radiating fin portion 41. Remove. Then, the refrigerant liquid that has reached the communication port 5 on the opposite side passes through the communication port 5 and is discharged to the refrigerant outlet tube.

  In addition, as described above, as the heating element cooled by the heat exchanger, various heating elements such as a power semiconductor element such as IGBT, an electronic component such as a reactor or a capacitor, or a power module combining them are used. Can be mounted on the heating element mounting surface 400.

  Next, the function and effect of this example will be described. As shown in FIGS. 2 and 3, the heat exchanger 1 is arranged with the radiating fins 41 in the heat sink part 4 inserted in the cooling pipe part 3, and the base part 40 and the cooling pipe part 3 are cut. The periphery of the notch opening 30 is joined. Thereby, when a refrigerant liquid distribute | circulates inside the cooling pipe part 3 part, the radiation fin part 41 is comprised so that a refrigerant liquid may be contacted. As a result, the refrigerant liquid can efficiently remove heat from the heat radiating fin portions 41, and thus the heat exchanger 1 has excellent heat radiating performance.

  Moreover, as shown in FIGS. 5-7, the housing part 2 is formed by extrusion so that the cooling pipe part 3 and the plate part 20 may be provided integrally. Therefore, the thickness of the cooling pipe portion 3 and the plate portion 20 can be easily reduced, and the housing portion 2 is excellent in productivity. Furthermore, since the length of the cooling pipe part 3 can be freely selected, design changes such as changes in cooling capacity are facilitated.

  Moreover, the communication port 5 as a some joint part is formed by processing the edge part of the longitudinal direction of the cooling pipe part 3, as shown in FIG. Thereby, the shape of the communication port 5 is greatly deformed from the shape by extrusion molding, and it becomes easy to match the external piping from the outside of the heat exchanger 1. As a result, it is not necessary to prepare the joint part separately from the housing part 2, and the number of parts can be reduced.

  As shown in FIG. 1, the heat exchanger 1 has a plurality of cooling pipe portions 3, and the plurality of cooling pipe portions 3 are connected to each other via a plate portion 20. Thereby, the several cooling pipe part 3 can be made into the suitable range in order to make uniform the flow velocity distribution of the refrigerant | coolant liquid which distribute | circulates each width | variety to each cooling pipe part 3. FIG. For this reason, the refrigerant liquid can easily come into uniform contact with the entire radiation fin portion 41, and heat can be uniformly radiated from the entire radiation fin portion 41. As a result, the heat exchanger 1 can cool a plurality of heating elements uniformly.

  Moreover, as shown in FIG. 1, the recessed part 21 is provided by the several cooling pipe part 3 and the plate part 20 which has connected these. Therefore, even if a part of the devices arranged in the peripheral part of the heat exchanger 1 protrudes toward the heat exchanger 1, the protruding portion of the devices can be accommodated in the recess 21 and the dead space is reduced. can do.

  Further, as shown in FIGS. 2 and 3, the base portion 40 and the periphery of the notch opening 30 of the cooling pipe portion 3 are joined by friction stir welding. Thereby, it becomes easy to perform said joining so that there may be no unjoined part. Therefore, leakage of the refrigerant liquid from the joint portion can be prevented. Further, since it is not necessary to use a connecting member such as a brazing material for joining the base portion 40 and the cooling pipe portion 3, the number of parts can be reduced.

  As described above, according to this example, it is possible to provide a heat exchanger having a housing portion that is small and light and has excellent productivity.

  Moreover, in this example, the heat sink part 4 is produced by hot forging the aluminum material which has the said specific chemical component composition. The heat sink part 4 obtained in this way has a relatively high strength and can reduce deformation of the radiating fin part 41 and the base part 40 in the subsequent cutting and assembly processes. As a result, it becomes easy to improve the dimensional accuracy of the radiating fin portion 41, the flatness of the heating element mounting surface 400, and the like.

(Example 2)
This example is an example in which a joint portion prepared separately from the housing portion 2 is joined to one end portion of the cooling pipe portion 3 in the heat exchanger of the first embodiment. In the heat exchanger 1 of this example, as shown in FIGS. 9 and 10, a distribution pipe 51 as a joint portion including a header portion 53 and a communication port 52 is joined to one end portion of the cooling pipe portion 3. ing. Further, the other end portion of the cooling pipe portion 3 is formed with a connecting port 5 similar to that of the first embodiment by plastic working.

  As shown in FIG. 13, the distribution pipe 51 has a connection port 52 for connecting an external pipe, and a header part 53 that communicates with the open ends of the two cooling pipe parts 3 and integrates a plurality of flow paths into one. doing. The header portion 53 is formed in a substantially rectangular tube shape as shown in FIG. 12, and is arranged with its longitudinal direction directed in the width direction Y as shown in FIGS. As shown in FIG. 12, a communication port 52 is formed at one end in the longitudinal direction of the header portion 53, and the other end in the longitudinal direction is closed. In addition, two coolant circulation holes 54 are formed at positions where the header portions 53 are joined to the housing portion 2 at positions corresponding to the open ends of the respective cooling pipe portions 3.

  As a manufacturing method for manufacturing such a distribution pipe 51, for example, an impact molding process for forming a square tube 500 having one side opened as a basic shape of the distribution pipe 51, and a coolant circulation hole 54 is formed in the square tube 500. There is a method that includes a drilling step for forming a hole and a terminal processing step for forming the open end of the square tube 500 into a cylindrical shape. In the impact molding process, the prismatic aluminum material is impacted with a punch to obtain a square tube 500 that is closed at one end and opened at one end. In this example, the prismatic aluminum material made of 1100 material was impact molded to obtain a square tube 500 with one end closed and one end opened as shown in FIG.

  In the drilling step, the square tube 500 obtained in the impact molding step is cut to form the coolant circulation hole 54. In this example, as shown in FIG. 12, two refrigerant circulation holes 54 arranged in the longitudinal direction are formed.

  In the terminal processing step, a cylindrical connection port 52 is formed at the opening end by performing plastic working such as press molding on the opening end of the square tube 500. In this example, a plastic work for forming the cross section of the square tube 500 into a substantially cylindrical shape was performed by press-fitting a substantially conical shaped plug into the open end of the square tube 500. Thereby, as shown in FIG. 13, a distribution pipe 51 having a communication port 52 was obtained.

  Further, as shown in FIG. 10, the distribution pipe 51 is joined to the housing part 2 by brazing. Specifically, as shown in FIG. 10, a brazing plate 501 in which a hole is formed in accordance with the shape of the joint portion between the housing part 2 and the distribution pipe 51 is produced, and the gap between the housing part 2 and the distribution pipe 51 is produced. Arranged. Then, both were brazed by heating to the melting point of the brazing plate 501 in a heating furnace. In addition, joining of a distribution pipe and a housing part is not limited to brazing, It is also possible to employ | adopt well-known joining methods, such as an adhesive agent.

  In the heat exchanger 1 of this example, for example, the connection port 52 of the distribution pipe 51 and the refrigerant introduction pipe are connected, and the communication port 5 formed at the opening end of the cooling pipe portion 3 and the refrigerant outlet pipe are connected. The heating element is cooled as follows. First, when the refrigerant liquid is supplied from the refrigerant introduction pipe, the refrigerant liquid is distributed by the header portion 53, and the refrigerant liquid flows into the respective cooling pipe portions 3 from the refrigerant circulation holes 54. In the cooling pipe portion 3, the refrigerant liquid circulates in the longitudinal direction X, and at the same time, performs heat exchange with the radiating fin portion 41 that is in contact with it, and removes heat accumulated in the radiating fin portion 41. And it passes through the connection port 5 formed by plastic working and is discharged to the refrigerant outlet pipe. In this example, it is also possible to replace the connection between the refrigerant introduction pipe and the refrigerant outlet pipe, connect the distribution pipe 51 and the refrigerant outlet pipe, and connect the communication port 5 and the refrigerant introduction pipe. .

  Thus, the obtained heat exchanger 1 can have the same effect as Example 1. FIG. In this example, although the example using distribution pipe 51 provided with header part 53 and connecting port 52 as a joint part prepared separately was shown, it is not limited to this. For example, it is also possible to take a configuration in which one end of the cooling pipe portion 3 is connected by a pipe or the like.

(Example 3)
This example is an example in which the number of cooling pipe portions 3 of the heat exchanger 1 in the first embodiment is changed. The heat exchanger 1 of this example has one cooling pipe part 3 as shown in FIGS. Others are the same as in the first embodiment.

  As described above, the cooling pipe portion 3 of the heat exchanger 1 can be freely changed in number or length according to the cooling design such as the area required for the heating element mounting surface 400 and the required cooling performance. It is possible to do. Further, the number of the heat sink portions 4 and the number of the cooling pipe portions 3 are not necessarily the same. For example, a plurality of heat sink portions 4 are arranged in the longitudinal direction X or the width direction Y with respect to one cooling pipe portion 3. It is also possible to take an arranged configuration. In addition, the same effects as those of the first embodiment can be achieved.

  Moreover, the shape of the radiation fin part 41 in the heat sink part 4 is not limited to the cylindrical pin 410, and various shapes can be adopted according to the cooling design. For example, prismatic pins or corrugated fins may be used, or plate fins having a comb-like cross section produced by extrusion processing may be used. Regarding the arrangement and density of the fins, various modes can be adopted in accordance with the cooling design as well as the shape.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Housing part 20 Plate part 3 Cooling pipe part 30 Notch opening part 4 Heat sink part 40 Base part 400 Heating body mounting surface 41 Radiation fin part 5 Contact port

Claims (3)

A housing part comprising a tubular cooling pipe part and a plate-like plate part extended from the outer peripheral surface of the cooling pipe part;
A heat sink disposed in a notch opening provided by cutting out a part of the cooling pipe, and
A plurality of joint portions disposed at both ends in the longitudinal direction of the cooling pipe portion;
The heat sink part includes a plate-like base part having a heating element mounting surface for mounting the heating element, and a radiation fin part standing from a surface opposite to the heating element mounting surface in the base part. And the base part and the periphery of the notch opening part of the cooling pipe part are joined in a state where the radiating fin part is inserted into the cooling pipe part,
The housing part is formed by extrusion so as to integrally include the cooling pipe part and the plate part,
At least one of the plurality of joint portions is formed by processing a longitudinal end portion of the cooling pipe portion.   2. The heat exchanger according to claim 1, wherein the heat exchanger includes a plurality of the cooling pipe portions, and the plurality of cooling pipe portions are connected to each other via the plate portion.   The heat exchanger according to claim 1 or 2, wherein the base portion and the periphery of the notch opening portion of the cooling pipe portion are joined by brazing or friction stir welding. vessel.

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