JP2009212136A - Cooler of heating element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooler of a heating element that improves cooling performance. <P>SOLUTION: The cooler includes a first radiator 51 which includes one main face where the heating elements 11A to 11C are installed by bringing them into contact with each other and the other main face where a radiation part 512 and a first bonding part 513 surrounding the radiation part are formed and which is formed of extrusion molding, and with a second radiator 52 having a second bonding part 525 having a bonding face 526 brazed/bonded to a bonding face 514 of the first bonding part and a reception part 523 receiving the radiation part and forming a refrigerant passage 521. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooling device for a heating element used in an inverter or the like.

  An inverter used in an electric vehicle is provided with a cooling device having aluminum radiating fins excellent in heat dissipation in order to cool a heating element. Conventional aluminum radiating fins are cast using an Al-Si aluminum alloy having excellent cast formability.

However, Al-Si-based aluminum alloys have technical problems that contradict each other between cast formability and thermal conductivity (coolability). If the amount of silicon Si added is reduced in order to improve the cooling performance, casting will occur. Formability is reduced. Therefore, the cooling capacity cannot be increased by reducing the fin interval of the heat dissipating fins.

  For this reason, a method has been proposed in which the case portion provided with the heat generating element and the heat dissipating fin are configured separately, and after the heat dissipating fin is manufactured by an extrusion molding method, both are brazed (Patent Document 1). . According to this method, it is possible to use an aluminum material having a small amount of Si added and excellent in thermal conductivity.

JP-A-8-163877

  However, if the case portion provided with the heat generating element and the heat dissipating fin are configured separately, there is a joining surface by brazing in the heat dissipating path from the heat generating element to the heat dissipating fin, so this joint surface becomes a heat dissipating resistor. There was a problem that the cooling performance deteriorated.

The problem to be solved by the present invention is to provide a cooling device for a heating element capable of improving the cooling performance.

The present invention solves the above problem by forming a heat radiating portion on the main surface opposite to the main surface on which the heat generating element is provided, and joining the first heat radiating body and the second heat radiating body at a portion other than the heat radiating portion. To do.

  According to the present invention, since the first heat radiating body and the second heat radiating body are joined at the joint portion other than the heat radiating portion, there is no heat radiating resistance in the heat radiating path from the heat radiating body to the heat radiating fin. Cooling performance can be enhanced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an electric circuit diagram showing a motor drive system including a cooling device for a heating element according to an embodiment of the present invention. The inverter 1 of each embodiment described below converts a direct current from a direct current power source 2 into an alternating current and supplies the alternating current to a three-phase alternating current motor 3. An insulated gate bipolar transistor 111 (IGBT, hereinafter simply referred to as a transistor) And a power conversion circuit 11 composed of a pair of diodes 112 (six pairs in the example shown in the figure), an input connector 12 for inputting power from the DC power source 2, and a power conversion circuit 11 and an output connector 13 that outputs the AC power converted at 11 to the motor 3.

Here, two pairs of transistors 111 and diodes 112 are modularized. Each module is called switching module 11A, 11B, 11C.

In addition to the power conversion circuit 11 shown in the figure, the inverter 1 is connected in parallel to the power conversion circuit 11 to suppress fluctuations and ripple components of the DC power supply 3 and to supply a stable DC power supply to the power conversion circuit 11. A discharge resistor or the like for discharging the electric charge accumulated in the smoothing capacitor is appropriately provided using a discharge capacitor composed of the capacitor for smoothing and the smoothing capacitor.

The switching modules 11A, 11B, and 11C correspond to the heating elements of the present invention, and a cooling device for cooling the transistor 111 that generates heat will be described below. However, the cooling device of the present invention is not limited to cooling the power conversion circuit 11 of the inverter 1, and the present invention can be applied to uses for cooling a transistor and other heating elements.

The switching modules 11 </ b> A, 11 </ b> B, and 11 </ b> C are accommodated in a case 4 including a cooling device 5. FIG. 2 is a plan view showing the case 4 that houses the switching modules 11A, 11B, and 11C according to the present embodiment. In the figure, reference numeral 113 denotes a bus bar that connects each switching module and the DC power source 2, and reference numeral 114 denotes a bus bar that connects each switching module and the motor 3.

The above is the configuration common to the embodiments described below, and the configuration and operational effects of each embodiment will be described below.

<< First Embodiment >>
3A to 3C are cross-sectional views showing the cooling device 5 according to the first embodiment. FIG. 3A is a cross-sectional view taken along line IIIA-IIIA in FIG. 2, and FIG. 3B is taken along line IIIB-IIIB in FIG. 3C is an exploded sectional view of FIG. 3B, and FIG. 3D is an exploded perspective view showing the cooling device 5 according to the first embodiment in an exploded manner.

  The cooling device 5 of the present embodiment includes a first radiator 51, a second radiator 52, a refrigerant inlet 53a, and a refrigerant outlet 53b.

  The first heat dissipating body 51 has a flat board portion 511, and the switching modules 11A to 11C are fixed to the upper surface 511a, which is one main surface of the board portion 511, by contact with a fixing means such as a bolt. Yes. Further, on the lower surface 511b which is the other main surface, as shown in FIGS. 3A and 3B, a plurality of radiating fins 512 having a rectangular cross section are disposed at positions substantially directly below the switching modules 11A to 11C. And is formed integrally.

In the cooling device 5 of this example, as indicated by a two-dot chain line in FIG. 2, the refrigerant introduced from the refrigerant inlet 53a makes a U-turn after passing through the lower surface of one of the transistors of each of the switching modules 11A to 11C. A so-called U-turn circulation system is adopted that passes through the lower surface of the transistor and reaches the refrigerant outlet 53b. For this reason, the radiating fin groups 512a and 512b including the plurality of radiating fins 512 are formed in the forward path part from the refrigerant inlet 53a to the U-turn and the return path part from the U-turn to the refrigerant outlet 53b, respectively. Thus, the six transistors can be efficiently cooled.

Of the substrate portion 511 of the first radiator 51, the portion other than the two radiation fin groups 512a and 512b, that is, the portion surrounding the radiation fin groups 512a and 512b functions as a joint portion with the second radiator 52 described later. To do. The portion of the substrate portion 511 that surrounds the heat radiating fin groups 512a and 512b is referred to as a first joint portion 513 of the first heat radiating body 51, and the surface of the first joint portion 513 to which the second heat radiating body 52 is joined is referred to as a first portion. This is referred to as one joint surface 514 and is shown in FIGS. 3A to 3D.

  On the other hand, as shown in FIG. 3D, the second radiator 52 has a bottom surface 522 so as to receive the radiating fin groups 512a and 512b of the first radiator 51 and form a U-turn-shaped refrigerant channel 521. A recess 523 is provided. 3D is a perspective view in which the top and bottom of the first radiator 51 and the second radiator 52 are turned over with respect to FIGS. 3A to 3C, and the XYZ axes are shown in the drawings for easy understanding.

  The recess 523 formed in the second radiator 52 includes a portion 523a that receives one of the radiating fin groups 512a, a portion 523b that receives the other radiating fin group 512b, and a portion that connects these to make a U-turn of the refrigerant. 523c and has a U-shaped groove as a whole. Further, holes 524a and 524b communicating with the refrigerant inlet 53a and the refrigerant outlet 53b are formed in the bottom surfaces 522 at both ends of the U-shaped groove-shaped recess 523, respectively. Blocks 531a and 531b constituting the refrigerant inlet 53a and the refrigerant outlet 53b are fixed to the holes 524a and 524b, respectively. Note that pipes 532a and 532b are respectively fixed to the blocks 531a and 531b. 3A shows only the hole 524a, the block 531a, and the pipe 532a that communicate with the refrigerant inlet 53a, the hole 524b, the block 531b, and the pipe 532b that communicate with the refrigerant outlet 53b have the same structure as that shown in FIG. It has become.

  In this example, since the switching modules 11A to 11C are not located immediately above the portion 523c for making the U-turn of the refrigerant in the U-shaped groove-shaped recess 523 as shown in FIG. 2, the radiating fin groups 512a and 512b are provided. Absent.

  Of the upper surface of the second heat dissipating member 52, the part other than the recess 523 and the blocks 531a and 531b functions as a joint portion with the first heat dissipating member 51 described above. This portion is referred to as a second joint portion 525 of the second heat radiator 52, and the surface of the second joint portion 525 to which the first joint surface 514 of the first heat radiator 51 is joined is referred to as a second joint surface 526. Shown in FIGS. 3A-3D. The second joining portion 525 of the second heat dissipating body 52 is formed to be thicker by the depth of the concave portion 523 than the bottom portion of the concave portion 523, and corresponds to the thick portion of the present invention.

  Next, the material and manufacturing method of the cooling device 5 according to the present embodiment will be described.

  As described above, the cooling device 5 of the present example includes the first radiator 51, the second radiator 52, the block 531, and the pipe 532.

Among these, the 1st thermal radiation body 51 is integrally formed by extrusion molding by using the extending | stretching material of aluminum or aluminum alloy as a raw material. Since the wrought material can be applied to forging and pressing as well as extrusion, the first radiator 51 of this example can be manufactured by forging or pressing, but the fin spacing of the radiating fins 512 is reduced. From the viewpoint of increasing the effective heat dissipation area, extrusion molding is more preferable. Since the first heat radiator 51 has the same cross-sectional shape along the Y-axis direction as shown in FIG. 3E, it can be formed by extrusion molding. And heat dissipation performance can be improved by reducing the fin space | interval of the radiation fin 512. FIG.

The type of the wrought material is not particularly limited, but the number 1000 type wrought material made of 99% or more pure aluminum, the number 3000 type wrought material whose strength has been improved by adding manganese Mn, magnesium Mg or silicon Si It is preferable to use a 6000 type wrought material which has been added to improve strength and corrosion resistance. In particular, a wrought material having no additive or a wrought material having a small additive amount has a high thermal conductivity, so that the heat dissipation performance can be improved.

When the first radiator 51 is extrusion-molded, the radiation fins 512 are also formed at both ends of each of the radiation fin groups 512a and 512b as shown in the upper diagram of FIG. 3E. However, since it is necessary to form the first joint surface 514 of the first joint portion 513 of the first heat dissipating body 51 at both ends, the both ends are cut after extrusion as shown in the lower diagram of the figure. The heat radiating fin 512 is deleted by processing. Thus, the 1st thermal radiation body 51 is obtained by extruding and cutting an aluminum extending material.

On the other hand, the second heat dissipating body 52 is integrally formed by a casting method or a die casting method using a cast material of an Al—Si based aluminum alloy in which silicon Si is added to aluminum as a raw material. The second heat dissipating member 52 is a member that does not exist in the heat dissipating path from the switching modules 11A to 11C, which are heat generating sources, to the heat dissipating fins 512. Therefore, the silicon-added aluminum having relatively low heat dissipating performance but excellent castability Is preferably used. Thereby, the fluidity | liquidity to the casting_mold | template of molten aluminum improves and the 2nd heat radiating body 52 with high casting quality can be obtained.

The block 531 is also a member that does not exist in the heat radiation path from the switching modules 11A to 11C to the heat radiation fin 512, and therefore can be manufactured by casting or die casting using silicon-added aluminum having excellent cast formability. However, since the cross-sectional shape is also the same, it can also be manufactured by extrusion molding using the wrought material described above. Then, the coolant passage is formed by drilling.

The first radiator 51 and the second radiator 52 manufactured as described above are joined by brazing. As described above, the brazing joint is performed between the first joint surface 514 of the first joint portion 513 of the first heat radiator 51 and the second joint surface 526 of the second joint portion 525 of the second heat radiator 52. This can be done by placing and heating the material. When joining the first radiator 51 made of wrought aluminum and the second radiator 52 made of cast aluminum, it is important to select a brazing material having a relatively low melting point as the brazing material used here. Is desirable.

The block 531 and the pipe 532 can also be joined by brazing. Further, the block 531 to which the pipe 532 is joined and the second radiator 52 can also be joined by brazing.

Finally, as shown in FIG. 3C, the case 4 and the switching modules 11 </ b> A to 11 </ b> C are fixed to the cooling device 5 joined as described above by fastening means such as bolts.

As described above, according to the cooling device 5 according to the present embodiment, the first heat radiator 51 has a shape that can be extruded because of the structural relationship between the first heat radiator 51 and the second heat radiator 52. 1 The heat radiating body 51 can be comprised from the wrought material aluminum excellent in thermal conductivity.

In addition, since the first heat dissipating body 51 has a shape that can be extruded, the surface area of the heat dissipating fins 512 can be reduced and the surface area can be increased, so that the heat dissipating performance can be improved.

Further, the heat radiation path from the switching modules 11A to 11C, which are heat generation sources, to the heat radiation fins 512 is composed of the above-described wrought aluminum material having excellent thermal conductivity, and there is no joint that becomes a thermal resistance. Performance can be increased.

Further, since the first heat dissipating body 51 and the second heat dissipating body 52 constituting the refrigerant flow path 521 are joined by brazing, a seal member such as a seal ring is not necessary, and an installation fee for installing the seal ring is not required. Since it becomes unnecessary, the cooling device 5 can be downsized accordingly.

Further, since the second heat dissipating body 52 that hardly contributes to the heat dissipating performance of the cooling device 5 is formed by casting or die casting, the productivity can be improved and it can be manufactured at low cost.

<< Second Embodiment >>
FIG. 4A is an exploded perspective view showing the heat generating element cooling device 5 according to the second embodiment in an exploded manner, and FIG. 4B is a cross-sectional view showing the cooling device 5 and taken along the line IIIB-IIIB in FIG. It is.

The cooling device 5 of the present embodiment is different from the cooling device 5 of the first embodiment described above in the configuration of the second radiator 52, and the other configurations of the first radiator 51, the block 531 and the pipe 532 are the same. It is. Therefore, in the following, common members are denoted by the same reference numerals as those in the first embodiment, and the description thereof is incorporated herein.

The second radiator 52 according to the first embodiment described above is integrally formed by casting or die casting using a cast aluminum material as a raw material. However, the second radiator 52 of the present example includes a flat bottom plate 52B, In cooperation with the bottom plate 52B, the frame 52A is divided into two, which form a recess 523 which is a receiving portion of the heat radiation fin 512.

Holes (not shown) corresponding to the holes 524a and 524b according to the first embodiment are formed in the flat bottom plate 52B, and the blocks 531a and 531b are joined to the respective holes by brazing. Since this bottom plate 52B is a member that does not exist in the heat dissipation path from the switching modules 11A to 11C to the heat dissipation fin 512, it can be manufactured by casting or die casting using silicon-added aluminum having excellent castability, Since the cross-sectional shape is also the same, it can also be manufactured by extrusion molding using the wrought material described above. However, from the viewpoint of brazing, it is desirable to manufacture by extrusion molding using wrought aluminum.

On the other hand, in the frame body 52A, a portion that becomes a part of the concave portion 523 is inserted in the vertical direction, and this is surrounded by the second joint portion 525, thereby having the same cross section with respect to the extrusion molding direction shown in FIG. 4A. Therefore, it can be formed by extrusion molding using wrought aluminum as a raw material.

In addition, although the 2nd junction part 525 of 52 A of frames shown to the figure is solid, in order to achieve weight reduction, as shown to FIG. 4C, it can also form in a hollow shape. FIG. 4C is a perspective view showing a modified example of the frame 52A according to the second embodiment. In this case, in order to maintain the shape of the frame body 52A and ensure the strength, ribs 529 are provided in the second joint portions 525 on each side.

As shown in FIG. 4B, the frame body 52A and the bottom plate 52B are joined by brazing at a portion of the third joint surface 527 of the frame body 52A and the fourth joint surface 528 of the bottom plate 52B. The same applies to the modification shown in FIG. 4C.

As described above, according to the cooling device 5 according to the present embodiment, the first heat radiator 51 has a shape that can be extruded because of the structural relationship between the first heat radiator 51 and the second heat radiator 52. 1 The heat radiating body 51 can be comprised from the wrought material aluminum excellent in thermal conductivity.

In addition, since the first heat dissipating body 51 has a shape that can be extruded, the surface area of the heat dissipating fins 512 can be reduced and the surface area can be increased, so that the heat dissipating performance can be improved.

Further, the heat radiation path from the switching modules 11A to 11C, which are heat generation sources, to the heat radiation fins 512 is composed of the above-described wrought aluminum material having excellent thermal conductivity, and there is no joint that becomes a thermal resistance. Performance can be increased.

Further, since the first heat dissipating body 51 and the second heat dissipating body 52 constituting the refrigerant flow path 521 are joined by brazing, a seal member such as a seal ring is not necessary, and an installation fee for installing the seal ring is not required. Since it becomes unnecessary, the cooling device 5 can be downsized accordingly.

Although the above is an effect common to 1st Embodiment mentioned above, in this example, the 2nd heat sink 52 is divided | segmented into the frame 52A and the baseplate 52B of the shape which can be extrusion-molded, and frame 52A is divided. Since it is made of wrought aluminum, the brazing property between the first radiator 51 and the second radiator 52 is better than that of the cast aluminum second radiator 52.

Further, as shown in FIG. 4C, when the frame body 52A is formed in a hollow shape, the weight can be reduced and the cost can be reduced as the amount of material used is reduced. Further, since the heat capacity is reduced by reducing the thickness (lightening), the brazing reliability is improved.

<< Third Embodiment >>
FIG. 5A is an exploded perspective view showing the heat generating element cooling device 5 according to the third embodiment in an exploded manner.

The cooling device 5 of the present embodiment is different from the cooling device 5 of the second embodiment described above in the configuration of the frame body 52A of the second radiator 52, and the other first radiator 51, bottom plate 52B, block 531. The configuration of the pipe 532 is the same. Therefore, in the following, common members are denoted by the same reference numerals as those in the first embodiment and the second embodiment, and the description thereof is incorporated herein.

The frame body 52A according to the second embodiment described above is integrally formed by extrusion molding using wrought aluminum as a raw material. However, the frame body 52A of the present example further divides this into wrought material. Aluminum is used as a raw material to be formed by extrusion and joined together by brazing.

That is, the frame body 52A of the present example is configured by five members 52A1 to 52A5 to be the second joint portions 525, and each is formed by extrusion molding using a wrought material aluminum as a raw material. The extrusion direction of each of the members 52A1 to 52A5 can be the Z-axis direction shown in the figure. However, the members 52A1 to 52A5 have the same cross section with respect to the X-axis and Y-axis directions except for the member 52A1, so You can also

The members 52A1 to 52A5 of the frame 52A shown in the figure are all solid, but in order to improve the brazing reliability as the weight is reduced and the heat capacity is reduced, a hollow shape is used as shown in FIG. 5B. It can also be formed. FIG. 5B is a perspective view showing a modified example of each member 52A1 to 52A5 of the frame 52A according to the third embodiment. In this case, a rib 529 can be provided to ensure the strength of the members 52A1 to 52A5. Moreover, all the members 52A1 to 52A5 can be formed in a hollow shape, or some of the members 52A1 to 52A5 can be formed in a hollow shape.

Each member 52A1 to 52A5 is joined to an adjacent member by brazing to form a frame 52A. The frame 52A and the bottom plate 52B are joined by brazing at the same joint surface as in the second embodiment described above. The

As described above, according to the cooling device 5 according to the present embodiment, in addition to the effects of the second embodiment described above, the shapes of the members 52A1 to 52A5 constituting the frame body 52A are simplified, so that the extrusion molding is performed. Improves.

<< 4th Embodiment >>
FIG. 6A is an exploded perspective view showing the heat generating element cooling device 5 according to the fourth embodiment in an exploded manner.

The cooling device 5 of the present embodiment is different from the cooling device 5 of the third embodiment described above in the configuration of the frame body 52A of the second radiator 52, and the other first radiator 51, bottom plate 52B, block 531. The configuration of the pipe 532 is the same. Therefore, in the following, common members are denoted by the same reference numerals as those in the first embodiment and the third embodiment, and the description thereof is incorporated herein.

In the frame body 52A according to the third embodiment described above, the sealing performance of the refrigerant flow path 523 is maintained by brazing the first heat radiator 51 and the bottom plate 52B. Is divided into a sealing member 52C and five reinforcing members 52D (52D1 to 52D5) to reduce brazed points.

  The sealing member 52C of this example is formed of a rubber material having a relatively high elastic modulus such as NBR or EPDM, and the entire circumference of one surface (the lower surface in the figure) is the first joint portion 513 of the first radiator 51. The entire periphery of the other surface (the upper surface in the drawing) has seal portions 52C1 to 52C4 that contact the fourth joint surface 528 of the bottom plate 52B. Both surfaces of the seal portions 52C1 to 52C4 are in contact with the first radiator 51 and the bottom plate 52B, respectively, and further pressed by the bottom plate 52B, so that the water tightness of the coolant channel 523 is ensured. .

  At the four corners of the seal member 52C, bulged portions 52C5 having a substantially rectangular parallelepiped shape or a substantially cubic shape bulging outward are formed.

  On the other hand, the four reinforcing members 52D1 to 52D4 are formed into a hollow shape by extrusion molding using wrought aluminum as a raw material, and screw holes 52D6 are formed at both ends. By screwing the bolt 52B1 into the screw hole 52D6 via the bolt hole 52B2 formed in the bottom plate 52B, the bottom plate 52B and the reinforcing members 52D1 to 52D4 are joined, and at the same time, the seal member 52C is pressed by the bottom plate 52B. Will be.

  In addition, both end surfaces of the four reinforcing members 52D1 to 52D4 have a length that abuts against the vertical surfaces of the two bulging portions 52C5 on each side of the seal member 52C. Since it is formed, the sealing performance can be further enhanced.

  Here, with respect to the bulging portion 52C5 of the seal member 52C, both end portions of the reinforcing members 52D1 to 52D4 can be deformed as shown in FIG. 6B or 6C to further improve the sealing performance.

6B is a view showing a modification of the reinforcing members 52D1 to 52D4 according to the present embodiment, and shows an enlarged view of the VIB portion of FIG. 6A, (a) a perspective view, (b) a plan view, and (c) CC. It is sectional drawing which follows a line. In the modification shown in the figure, first protrusions 52D7 are formed at both ends of each of the reinforcing members 52D1 to 52D4, and are in contact with the two surfaces of the bulging portion 52C5 of the seal member 52C. As a result, as shown in FIG. 4B, at the four corners of the seal member 52C, the four surfaces of the bulging portion 52D5 become seal surfaces, and the sealing performance is further improved. Further, as shown in FIG. 5C, if a step portion 52C6 is formed on each side other than the bulging portion 52D5 and the sealing member 52C is sandwiched also at the step portion 52C6, the sealing performance at each side is obtained. It can be further increased.

FIG. 6C is a diagram showing a further modification of the reinforcing members 52D1 to 52D4 according to the present embodiment, and is an enlarged (a) perspective view and (b) plan view showing an enlarged VIB portion of FIG. 6A. In the modification shown in the figure, in addition to the first protrusions 52D7, the second protrusions 52D8 are formed at both ends of each of the reinforcing members 52D1 to 52D4, and are in contact with the six surfaces of the bulging portion 52C5 of the seal member 52C. . As a result, as shown in FIG. 5B, the eight surfaces of the bulging portion 52D5 become the sealing surfaces at the four corners of the sealing member 52C, and the sealing performance is further improved.

  Returning to FIG. 6A, the lower surfaces of the four reinforcing members 52D1 to 52D4 are brazed to the first joint surface 514 of the first joint portion 513 of the first heat dissipating body 51, but brazing of the other surfaces is not necessary. . Further, the remaining reinforcing member 52D5 functions as a partition between the forward path and the return path of the refrigerant flow path 523, and only the lower surface in the figure is brazed to the first joint surface 514 of the first joint portion 513 of the first heat radiator 51. .

  As described above, according to the cooling device 5 according to the present embodiment, since the seal member 52C is provided as compared with the cooling device 5 according to the third embodiment described above, the seal of the refrigerant channel 523 is sealed by the seal member 52C. Secured. Accordingly, the four reinforcing members 52D1 to 52D4 and the reinforcing member 52D5 as a partition can be brazed to the first heat radiator 51 only on the lower surface and fastened to the bottom plate 52B with the bolt 52B1, so that the number of brazed portions is reduced. can do.

  Further, by forming the first protrusion pieces 52D7 and / or the second protrusion pieces 52D8 at both ends of the reinforcing members 52D1 to 52D4, the sealing performance at the four corners of the seal member 52C can be further improved.

<< 5th Embodiment >>
FIG. 7A is an exploded perspective view showing the heat generating element cooling device 5 according to the fifth embodiment in an exploded manner, and FIG. 7B is a cross-sectional view taken along line VIIB-VIIB in FIG. 7A.

The cooling device 5 of the present embodiment is different from the cooling device 5 of the fourth embodiment described above in the configuration of the frame body 52A of the second radiator 52, and the other first radiator 51, bottom plate 52B, block 531. The configuration of the pipe 532 is the same. Therefore, in the following, common members are denoted by the same reference numerals as those in the first embodiment and the third embodiment, and the description thereof is incorporated herein.

  The frame body 52A according to the above-described fourth embodiment is configured by the seal member 52C and the reinforcing members 52D1 to 52D5. However, the frame body 52A of this example includes the seal member 52C and a boss 52E in which a screw is formed on the inner surface. The weight is reduced and the number of parts is reduced.

  The sealing member 52 of this example is made of a polyamide resin such as polyphenylene sulfide resin PPS or nylon 66 as a base material, and a resin layer having a high elastic modulus such as an elastomer resin is formed on the surface. Then, as shown in FIG. 7A, the second joint portion 525 is provided around the insertion portion constituting the coolant channel 523. The shape is the same as the frame 52A of the second embodiment (see FIG. 4A) described above except for the bolt hole 52C6.

  The boss 52E is joined to the first joint surface 514 of the first joint portion 513 of the first radiator 51 by brazing, and as shown in FIG. 7B, the bolt hole 52B2 of the bottom plate 52B and the bolt hole of the seal member 52C. Bolt 52B1 is screwed through 52C6. Accordingly, the second joint surface 526 of the seal member 52C and the first joint surface 514 of the first heat radiator 51 are in close contact with each other, and the third joint surface 527 of the seal member and the fourth joint surface 528 of the bottom plate 52B are in close contact with each other. Will do.

  As described above, according to the cooling device 5 according to the present embodiment, the frame body 52A is replaced with the sealing member 52C and the boss 52E in place of the reinforcing members 52D1 to 52D5 as compared with the cooling device 5 according to the fourth embodiment described above. Because it is configured with, it can be reduced in weight. Further, by providing the sealing member 52C with a sealing function and a reinforcing function, the number of parts can be reduced, and the cost can be reduced and the assembling workability can be improved.

It is an electric circuit diagram showing a motor drive system including a cooling device for a heating element according to an embodiment of the present invention. It is a top view which shows the inverter containing the cooling device of the heat generating element which concerns on embodiment of this invention. It is sectional drawing which follows the IIIA-IIIA line | wire of FIG. 2 which shows the cooling device of the heat generating element which concerns on 1st Embodiment of this invention. It is sectional drawing which follows the IIIB-IIIB line | wire of FIG. 2 which shows the cooling device of the heat generating element which concerns on 1st Embodiment of this invention. FIG. 3 is an exploded cross-sectional view taken along the line IIIB-IIIB in FIG. 2, showing an exploded view of the cooling device for the heating element according to the first embodiment of the present invention. It is a disassembled perspective view which decomposes | disassembles and shows the cooling device of the heat generating element which concerns on 1st Embodiment of this invention. It is a perspective view for demonstrating the manufacturing method of the cooling device of the heat generating element which concerns on 1st Embodiment of this invention. It is a disassembled perspective view which decomposes | disassembles and shows the cooling device of the heat generating element which concerns on 2nd Embodiment of this invention. It is sectional drawing which follows the IIIB-IIIB line | wire of FIG. 2 which shows the cooling device of the heat generating element which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the modification of the frame which concerns on 2nd Embodiment of this invention. It is a disassembled perspective view which decomposes | disassembles and shows the cooling device of the heat generating element which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the modification of the frame which concerns on 3rd Embodiment of this invention. It is a disassembled perspective view which decomposes | disassembles and shows the cooling device of the heat generating element which concerns on 4th Embodiment of this invention. It is a figure which shows the modification of the frame which concerns on 4th Embodiment of this invention, Comprising: It is the perspective view which expands and shows the VIB part of FIG. 6A, a top view, and sectional drawing which follows CC line. It is a figure which shows the further modification of the frame which concerns on 4th Embodiment of this invention, Comprising: It is the perspective view and top view which expand and show the VIB part of FIG. 6A. It is a disassembled perspective view which decomposes | disassembles and shows the cooling device of the heat generating element which concerns on 5th Embodiment of this invention. It is sectional drawing which follows the VIIB-VIIB line | wire of FIG. 7A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Inverter 11 ... Power conversion circuit 11A-11C ... Switching module (heating element)
DESCRIPTION OF SYMBOLS 5 ... Cooling device 51 ... 1st heat radiator 511 ... Board | substrate part 512 ... Radiation fin (radiation part)
513 ... 1st joined part 514 ... 1st joined surface 52 ... 2nd heat sink 52A ... Frame 52B ... Bottom plate 52C ... Seal member 52C5 ... Swelling part 52D ... Reinforcement member 52D7 ... 1st protrusion piece (projection piece)
52D8 ... 2nd protrusion piece (protrusion piece)
52E ... Boss 521 ... Refrigerant flow path 522 ... Bottom surface 523 ... Recess (receiving part)
525 ... 2nd junction part (thick part)
526 ... second joint surface 53a ... refrigerant inlet 53b ... refrigerant outlet

Claims (11)

A first heat dissipating body having one main surface provided in contact with the heat generating element, and the other main surface on which the first joining portion surrounding the heat dissipating portion and the heat dissipating portion is formed, and formed by extrusion molding When,
A second joining part having a joining surface that is brazed to the joining surface of the first joining part, and a second heat radiating body having a receiving part that receives the heat radiating part and forms a refrigerant flow path. A cooling device for a heat generating element. In the cooling device of the heat generating element according to claim 1,
The heat-dissipating element cooling apparatus according to claim 1, wherein the first heat dissipating member has a flat substrate portion, and the heat dissipating portion protrudes from the other main surface of the substrate. In the cooling device of the heat generating element according to claim 1 or 2,
The receiving portion of the second heat radiator includes a recess having a bottom surface,
The cooling device for a heating element, wherein the second joint portion of the second heat radiating body includes a thick portion that surrounds the receiving portion and is thicker than a portion of the bottom surface. In the cooling device of the exothermic element according to any one of claims 1 to 3,
The heating element cooling device, wherein the second heat radiating body is integrally formed by casting or die casting. In the cooling device of the exothermic element according to any one of claims 1 to 3,
The cooling device for a heating element, wherein the second heat radiating member is constituted by joining a plurality of members formed separately from each other. In the cooling device of the heat generating element according to claim 5,
The second heat radiator includes a flat bottom plate and a frame that includes the second joint portion and forms the receiving portion in cooperation with the bottom plate. In the cooling device of the heat generating element according to claim 6,
The frame body is constituted by joining a plurality of members formed separately to each other, and is configured to cool a heating element. In the cooling device of the heat generating element according to claim 5 or 7,
The cooling device for a heating element, wherein at least one member among the plurality of members is formed in a hollow shape by extrusion molding. In the cooling device of the heat generating element according to claim 6,
The cooling device for a heat generating element, wherein the frame includes a seal member that seals an entire circumference of the joint surface between the first joint and the second joint. In the cooling device of the heat generating element according to claim 9,
The frame includes a seal member that seals the entire circumference of the joint surface between the first joint and the second joint, and a reinforcing member that is disposed around the seal member. Heating element cooling device. In the cooling device of the heat generating element according to claim 10,
The seal member has a bulging portion that bulges outward at a corner portion;
The heating element cooling device according to claim 1, wherein the reinforcing member has a protruding piece that contacts at least a part of the bulging portion.

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