JP5609762B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device having a laminate in which a semiconductor module and a cooling pipe are laminated.

  As a power conversion device that performs power conversion between DC power and AC power, as shown in FIG. 13, a plurality of semiconductor modules 91 incorporating semiconductor elements and a plurality of cooling pipes 92 that cool the semiconductor modules 91 are provided. The thing provided with the laminated body 910 which laminated | stacked is known (refer the following patent document 1).

  The power conversion device 90 includes a frame 930 for holding the stacked body 910 inside. A leaf spring 980 is provided between the inner surface 931 of the frame and the laminated body 910. The laminated body 910 is pressed in the X direction by using the elastic force of the leaf spring 980 to press the laminated body 910 against the other inner surface 932 of the frame 930. Thereby, the laminated body 910 is fixed in the frame 930 while ensuring a contact pressure between the semiconductor module 91 and the cooling pipe 92.

JP 2007-173372 A

  However, the conventional power converter 90 has a problem in that the pressing force F of the spring member 980 has a manufacturing variation and is difficult to keep constant. If the pressing force F is too weak, the laminated body 910 cannot be fixed sufficiently. If the pressing force F is too strong, a problem such as the cooling pipe 92 being dented arises. Therefore, the pressing force F needs to be within a certain range. However, since the spring member 980 cannot easily adjust the pressing force F, the conventional power converter 90 has a problem that it is difficult to assemble.

  In order to solve this problem, as shown in FIG. 14, a structure in which the laminated body 910 is fixed to the fixed portion 96 using a bolt 95 can be considered. This power conversion device 90a includes a stacked body 910 in which a plurality of semiconductor modules 91 and a plurality of cooling pipes 92 are stacked, similarly to the conventional power conversion device 90 shown in FIG. Then, the bolts 95 are inserted into the through holes 990 formed at both ends of the cooling pipe 92, and the bolts 95 are screwed into the female screw portions 97 formed in the fixed portion 96, thereby pressing the laminated body 910 in the X direction. While fixing. In this way, the pressing force F of the laminated body 910 can be easily adjusted simply by adjusting the fastening torque of the bolt 95. Therefore, the power conversion device 90a can be easily assembled.

  Further, when the laminated body 910 is assembled with the bolts 95 in this way, the cooling pipe 92 is joined to the pair of outer shell members 93 arranged opposite to each other in the laminating direction (X direction) of the laminated body 910 by brazing or the like. Without being configured. That is, the cooling pipe 92 can be configured by combining the pair of outer shell members 93 with the gasket 94 interposed between the pair of outer shell members 93.

  In this way, even if the outer shell member 93 and the semiconductor module 91 are bonded by an adhesive or the like, it can be easily repaired when the power conversion device 1 fails. For example, when only a specific semiconductor module 91a among the plurality of semiconductor modules 91 fails, the bolt 95 is loosened, the cooling pipe 92 is disassembled, and the outer shell member that bonds the failed semiconductor module 91a to the semiconductor module 91a It can be removed and replaced together with 93a and 93b.

  However, since the power converter 90a fastens the laminated body 910 using the bolts 95, there is a problem that the cooling pipe 92 is likely to warp. As described above, since the pair of outer shell members 93 are not brazed or the like, when the cooling pipe 92 is warped, a gap between the pair of outer shell members 93 is widened, and the refrigerant 98 flowing in the cooling pipe 92 is likely to leak. Become.

  Particularly, a portion of the cooling pipe 92 that is away from the bolt 95 is less likely to receive the fastening force of the bolt 95, so that a gap between the pair of outer shell members 93 is likely to widen. For example, as shown in FIG. 14, when both ends of the cooling pipe 92 are fixed with bolts 95, the central part 920 of the cooling pipe 92 is curved, and in this central part 920, the gap between the pair of outer shell members 93 is widened. The refrigerant 98 is likely to leak.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a power conversion device that can be easily assembled and can prevent leakage of refrigerant.

The present invention is a laminate in which a plurality of semiconductor modules in which power terminals protrude from a main body portion in which a semiconductor element is sealed, and a plurality of cooling pipes through which a coolant that cools the semiconductor modules flows,
A fixed portion to which the laminate is fixed at one end in the stacking direction of the laminate,
Each of the cooling pipes has a pair of outer shell members arranged opposite to each other in the stacking direction, and an annular gasket interposed between the pair of outer shell members,
The pair of outer shell members include a flange portion that is overlapped with the gasket sandwiched therebetween, and a bulge portion that bulges from the inside of the flange portion toward the opposite side in the stacking direction. And the refrigerant flow path through which the refrigerant flows is formed between the bulging portions of the pair of outer shell members arranged opposite to each other, and the pair of outer shell members are pressed against each other via the gasket,
A plurality of through holes penetrating in the stacking direction are formed in the flange portion of the cooling pipe, and bolts are inserted into the through holes of the plurality of outer shell members in the stacked body to be formed in the fixed member. By screwing the bolt into the female screw part, the laminated body is fixed to the fixed part while pressing in the laminating direction,
A configuration in which the portion of the plurality of bolts that is away from the nearest bolt is thicker in the stacking direction of the gasket or the surface of the flange portion that contacts the gasket protrudes toward the gasket. The power converter is characterized by the above-mentioned features (claim 1).

  In the above power converter, since the laminated body is fixed using a plurality of bolts, the force for pressing the laminated body against the fixed portion can be easily adjusted only by adjusting the fastening torque of the bolts. . Therefore, the power conversion device can be easily assembled.

Further, the portion of the plurality of bolts that is farther from the nearest bolt is configured such that the thickness of the gasket increases or the surface of the flange portion that contacts the gasket protrudes toward the gasket. For this reason, the sealability of the refrigerant at the site away from the bolt can be improved.
When the laminated body is fixed using bolts, the fastening force of the bolts is less likely to be applied to a portion of the cooling pipe away from the bolts, and the gap between the pair of outer shell members is likely to be widened. Therefore, the portion of the plurality of bolts that is farther from the nearest bolt is configured such that the thickness of the gasket increases or the surface of the flange portion that contacts the gasket protrudes toward the gasket. Thereby, it becomes possible to improve the sealing performance of the refrigerant at a site away from the bolt. As a result, the pressure contact force between the flange portion and the gasket is less likely to vary depending on the distance from the bolt, and the refrigerant can be prevented from leaking at a portion close to or far from the bolt.

  As mentioned above, according to this invention, the power converter device which can be assembled easily and can prevent the leakage of a refrigerant | coolant can be provided.

The top view of the power converter device in Example 1. FIG. AA sectional drawing of FIG. BB sectional drawing of FIG. The principal part enlarged view of FIG. The top view of a gasket in Example 1. FIG. FIG. 3 is an exploded plan view of the cooling pipe in the first embodiment. FIG. 3 is a plan view of a cooling pipe in the first embodiment. FIG. 3 is an exploded plan view of the cooling pipe in which only the central portion of the gasket is thickened in the first embodiment. FIG. 6 is an exploded plan view of a cooling pipe in the second embodiment. The top view of the cooling pipe in Example 2. FIG. Sectional drawing of the power converter device in Example 3. FIG. FIG. 6 is an exploded plan view of a cooling pipe in the third embodiment. The top view of the power converter device in a prior art example. The top view of the power converter device in a comparative example.

A preferred embodiment of the present invention described above will be described.
The power conversion device of the present invention can be, for example, a vehicle-mounted power conversion device mounted on an electric vehicle or a hybrid vehicle. For example, a part of the storage case of the power conversion device can be used as the fixed portion. As the gasket, a gasket made of an elastic resin or a gasket made of a metal material can be used.

Moreover, a pair of said through-hole is formed in the both ends of the said cooling pipe in the width direction orthogonal to both the protrusion direction of the said power terminal, and the said lamination direction, and it goes to the center part from the both ends in the said width direction. It is preferable that the gasket is configured such that the thickness in the stacking direction is increased, or that the surface of the flange portion that contacts the gasket protrudes toward the gasket.
In this case, the refrigerant can be prevented from leaking from the central portion. That is, simply by forming through holes at both ends of the cooling pipe in the width direction and fixing the laminated body by inserting bolts into the through holes, the bolts are fastened at the site away from the bolts, that is, at the center. Although it becomes difficult to apply force and the gap between the pair of outer shell members widens, the refrigerant is liable to leak. However, with the above structure, it is possible to improve the sealability of the refrigerant in the central portion of the cooling pipe. Therefore, it can prevent that a refrigerant | coolant leaks from a center part. In addition, by fixing the cooling pipe with bolts at both ends, the laminate can be more stably fixed to the fixed part.

In addition, a pair of through holes are formed in the central portion of the cooling pipe in the width direction orthogonal to both the protruding direction of the power terminal and the stacking direction, and the distance from the central portion in the width direction toward both ends increases. It is preferable that the thickness of the gasket in the stacking direction is increased, or that the surface of the flange portion that contacts the gasket protrudes toward the gasket.
In this case, the refrigerant can be prevented from leaking from the both end portions. That is, simply by forming a through hole in the center of the cooling pipe in the width direction and inserting the bolt into the through hole and fixing the laminate, the bolts are separated from the bolt, that is, at both ends. The fastening force is difficult to be applied, and the gap between the pair of outer shell members is widened to make it easier for the refrigerant to leak. However, with the above structure, it is possible to improve the sealability of the refrigerant at both ends of the cooling pipe. Therefore, it is possible to prevent the refrigerant from leaking from both ends.

Further, it is preferable that the portion of the plurality of bolts that is away from the nearest bolt is configured such that the thickness of the gasket in the stacking direction is increased.
In this case, even when the thickness of the flange portion is made uniform, the sealing performance of the refrigerant can be improved. Therefore, the outer shell member can be formed by, for example, pressing a flat metal plate. Thereby, it becomes possible to reduce the manufacturing cost of a cooling pipe.

Moreover, the surface which contacts the said gasket of the said flange part may be comprised so that it may protrude in this gasket side, as the site | part away from the said nearest bolt among said several bolts.
In this case, the sealability of the refrigerant can be improved even when the gasket thickness is uniform. Therefore, it becomes possible to reduce the manufacturing cost of the gasket.

Example 1
A power converter according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the power conversion device 1 of this example includes a stacked body 10 in which a plurality of semiconductor modules 2 and a plurality of cooling pipes 3 are stacked, and a fixed portion 4 to which the stacked body 10 is fixed. .
The semiconductor module 2 has a main body 20 in which a semiconductor element is sealed, and a power terminal 21 (see FIG. 2) protrudes from the main body 20. The cooling pipe 3 includes therein a refrigerant flow path 30 (see FIG. 3) through which the refrigerant 11 that cools the semiconductor module 2 flows. The stacked body 10 is fixed to the fixed portion 4 at one end in the stacking direction (X direction) of the stacked body 10.

Each cooling pipe 3 includes a pair of outer shell members 31 arranged to face each other in the stacking direction (X direction), and an annular gasket 32 interposed between the pair of outer shell members 31.
As shown in FIG. 3 and FIG. 4, the pair of outer shell members 31 includes a flange portion 33 that is overlapped with a gasket 32 sandwiched between them, and an opposite side toward the X direction from the inside of the flange portion 33. And a bulging portion 34 that bulges. A refrigerant flow path 30 through which the refrigerant 11 flows is formed between the bulging portions 34 of the pair of outer shell members 31 arranged to face each other. The pair of outer shell members 31 are in pressure contact with each other via a gasket 32.

As shown in FIG. 1, the flange portion 33 of the cooling pipe 3 is formed with a plurality of through holes 35 penetrating in the stacking direction. The bolts 5 are inserted into the through holes 35 of the plurality of outer shell members 31 in the laminated body 10, and the bolts 5 are screwed into the female screw portions 40 formed in the fixed portion 4 material, so that the laminated body 10 is moved in the laminating direction. It is fixed to the fixed part 4 while being pressed.
And it is comprised so that the thickness in the lamination direction of the gasket 32 may become thicker as the site | part away from the nearest bolt 5 among several bolts 5. As shown in FIG.

  As shown in FIG. 2, the semiconductor module 2 includes a plurality of power terminals 21 protruding from the main body 20 and a control terminal 22 protruding on the opposite side of the power terminal 21. The power terminal 21 includes a positive terminal 21a connected to a positive electrode of a DC power supply (not shown), a negative terminal 21b connected to a negative electrode of the DC power supply, and an AC terminal 21c connected to an AC load. Further, a control circuit board (not shown) is connected to the control terminal 22. This control circuit board controls the switching operation of the plurality of semiconductor modules 2, thereby converting the DC voltage applied between the positive terminal 21a and the negative terminal 21b into an AC voltage and outputting it from the AC terminal 212c. .

  As shown in FIGS. 1 and 2, a pair of through holes 35 are formed at both end portions 37 of the cooling pipe 3 in the width direction (Y direction) orthogonal to both the protruding direction (Z direction) of the power terminal 21 and the X direction. Is formed. And it is comprised so that the thickness in the X direction of the gasket 32 may become thick, so that it goes to the center part 38 from the both ends 37 in a Y direction.

  As shown in FIG. 1, an annular member 15 is interposed between the through holes 35 of the two adjacent cooling pipes 3. One bolt 5 passes through the through holes 35 of the plurality of cooling pipes 3 and the plurality of annular members 15. The tip of the bolt 5 is screwed into the female screw portion 40 formed in the fixed portion 4 as described above. Thereby, the laminated body 10 is fastened in the X direction and fixed to the fixed portion 4.

  The two adjacent cooling pipes 3 are connected by a pair of connecting pipes 14 at both ends of the bulging portion 34 in the Y direction. Among the plurality of cooling pipes 3, the cooling pipe 3 a located on the opposite side to the fixed portion 4 in the X direction is provided with an introduction pipe 12 for introducing the refrigerant 11 into the refrigerant flow path 30, and the refrigerant flow path 30. A lead pipe 13 from which the refrigerant 11 is led is connected. When the refrigerant 11 is introduced from the introduction pipe 12, the refrigerant 11 is distributed in the refrigerant flow path 30 and flows out from the outlet pipe 13. Thereby, the semiconductor module 2 is cooled.

  As shown in FIG. 4, a gasket 32 is interposed between the pair of flange portions 33 and 33. The pair of outer shell members 31 are pressed in the X direction via the gasket 32 and are not brazed or welded. Therefore, when the bolts 5 are loosened, the pair of outer shell members 31 can be separated from each other.

  Further, the outer surface 340 of the bulging portion 34 is a flat surface. A refrigerant flow path 30 through which the refrigerant 11 flows is formed between the pair of bulging portions 34 and 34 that are arranged to face each other in the X direction. The refrigerant flow path 30 is provided with cooling fins 36 each composed of a flat middle plate 361 and a pair of corrugated plates 362. The middle plate 361, the corrugated plate 362, and the outer shell member 31 are made of aluminum. By providing the cooling fins 36 in the refrigerant flow path 30, the contact area with the refrigerant 11 is increased and the cooling performance of the semiconductor module 2 is enhanced.

  As shown in FIG. 2, the flange portion 33 is formed in an annular shape including a pair of linear portions 33a and 33b extending in the Y direction and arc-shaped portions 33c and 33d connecting both ends of the linear portions 33a and 33b. ing. The arc-shaped portions 33 c and 33 d have a semicircular outer edge portion 330 and an inner edge portion 331. The diameter of the outer edge 330 is substantially equal to the length of the cooling pipe 3 in the Z direction. The diameter of the inner edge portion 331 is substantially equal to the length of the bulging portion 34 in the Z direction. The through holes 35 are formed in the arc-shaped portions 33c and 33d, respectively.

  A bulging portion 34 is formed inside the flange portion 33. At both ends of the bulging portion 34 in the Y direction, connection through holes 140 for connecting the connecting pipe 14 or the introduction pipe 12 and the lead-out pipe 13 are formed. The diameter of the connecting through hole 140 is smaller than the diameter of the inner edge portion 331 of the arc-shaped portions 33c and 33d.

  As shown in FIG. 3, the main body 20 of the semiconductor module 2 is sealed with a semiconductor element 23 such as an IGBT element and a pair of metal heat sinks 24. The surface of the heat sink 24 is exposed from the main body 20. The heat sink 24 is in thermal contact with the cooling pipe 3 through an adhesive (insulating member) (not shown). The semiconductor element 23 and the heat sink 24 are electrically connected by solder 25. Although not shown, the power terminal 21 is connected to the heat sink 24. Thus, the semiconductor element 23 and the power terminal 21 are electrically connected via the heat sink 24.

  As shown in FIG. 5, the shape of the gasket 32 viewed from the X direction is substantially the same as the flange portion 33 (see FIG. 2) of the cooling pipe 3. The gasket 32 includes a pair of linear portions 32a and 32b extending in the Y direction, and arc-shaped portions 32c and 32d that connect both ends of the linear portions 32a and 32b. Inside the gasket 32, a hole 320 having a shape corresponding to the bulging portion 34 is formed. The arc-shaped portions 32 c and 32 d are formed with bolt insertion holes 321 for inserting the bolts 5 at positions corresponding to the through holes 35.

  As shown in FIG. 6, the two linear portions 32a and 32b of the gasket 32 have the thickest central portion 38 in the Y direction. When forming the cooling pipe 3, as shown in FIG. 6 and FIG. 7, two outer shell members 31 are arranged opposite to each other in the X direction, the gasket 32 is sandwiched between the flange portions 33, and the flange portions 33 are connected to each other. Overlapping. Then, the two outer shell members 31 are pressed in the X direction and pressed. When the two outer shell members are pressed, the gasket 32 is elastically deformed, and the central portion 38 is slightly thinner than before pressing.

  In this example, as shown in FIG. 6, the thickness of the gasket 32 is gradually increased from the both end portions 37 toward the central portion 38. However, as shown in FIG. May be formed, and only the vicinity of the central portion 38 may be thickened.

  The effect of this example will be described. In this example, as shown in FIG. 1, the laminated body 10 was fixed using the bolt 5. Therefore, by adjusting the tightening torque of the bolt 5, the pressing force F in the X direction of the laminated body 10 can be easily adjusted. Therefore, the power converter device 1 can be assembled easily.

Moreover, in this example, the thickness of the gasket 32 is thicker in the part (central part 38) far from the nearest bolt 5 among the plurality of bolts 5. Therefore, the sealing performance of the refrigerant 11 at a site away from the bolt 5 can be enhanced.
When the laminated body 10 is fixed using the bolts 5, it is difficult for the fastening force of the bolts 5 to be applied to a portion of the cooling pipe 3 away from the bolts 5, and the gap between the pair of outer shell members 31 is likely to be widened. Therefore, in the present example, the gasket 32 is configured such that the portion away from the nearest bolt 5 among the plurality of bolts 5 is thicker. Thereby, the sealing performance of the refrigerant | coolant 11 in the site | part away from the volt | bolt 5 can be improved. As a result, it is difficult for the refrigerant 11 to leak out even at a site close to the bolt 5 or a site far from the bolt 5.

Further, in this example, the laminated body 10 is fixed to the fixed part 4 by fastening both end portions 37 in the Y direction of the laminated body 10 using the bolts 5. And the thickness of the gasket 32 was made thicker as it went to the center part 38 from the both ends 37. FIG.
If it does in this way, it becomes possible to improve the sealing performance of the refrigerant | coolant 11 in the center part 38. FIG. When the laminated body 10 is fixed using the bolt 5, it is difficult to apply the fastening force of the bolt 5 at a portion (central portion) away from the bolt 5, and the gap between the pair of outer shell members 31 is likely to be widened. And since the sealing performance of this center part can be improved, the malfunction which the refrigerant | coolant 11 leaks from the center part 38 can be prevented. Moreover, in this example, since the laminated body 10 can be fixed in the both ends 37 of the longitudinal direction (Y direction) of the laminated body 10, the laminated body 10 can be fixed firmly and vibration resistance can be improved.

  Further, in this example, the thickness of the flange portion 33 is made uniform, and the thickness of the gasket 32 is made thicker from the both end portions 37 toward the central portion 38. In this way, since the thickness of the flange portion 33 can be made uniform, the outer shell member 31 can be formed by, for example, pressing a flat metal plate. Thereby, the manufacturing cost of the cooling pipe 3 can be reduced.

  Moreover, in this example, the semiconductor module 2 and the outer shell member 31 are bonded with an adhesive. The pair of outer shell members 31 are not brazed or welded. If it does in this way, it will become possible to repair the power converter device 1 easily. For example, when a specific semiconductor module 2a among a plurality of semiconductor modules 2 fails, the bolt 5 is loosened, the cooling pipe 3 is disassembled, and the failed semiconductor module 2a is bonded to the semiconductor module 2a. 31 can be removed and replaced.

  Moreover, the power converter device 1 of this example is a vehicle-mounted power converter device mounted on an electric vehicle or a hybrid vehicle. Since the power converter 1 of this example is fixing the laminated body 10 using a pair of volt | bolt 5, the vibration resistance of the laminated body 10 is high. Therefore, it can be suitably used as an in-vehicle power conversion device that easily generates vibration.

  As described above, according to this example, it is possible to provide a power conversion device that can be easily assembled and can prevent leakage of refrigerant.

(Example 2)
In this example, the structure of the cooling pipe 3 is changed. As shown in FIGS. 9 and 10, in this example, the thickness of the gasket 32 is made uniform, and the surface 335 that contacts the gasket 32 of the flange portion 33 is closer to the center portion 38 from the both end portions 37 in the Y direction. It protrudes to the side. In this example, the thickness of the flange portion 33 is increased at the central portion 38 so that the surface 335 protrudes toward the gasket 32 side.

As shown in FIG. 10, a pair of through holes 35 are formed in both end portions 37 of the cooling pipe 3. The laminated body 10 (see FIG. 1) is fixed to the fixed portion 4 by inserting the bolts 5 into the through holes 35.
In addition, the same configuration as that of the first embodiment is provided.

  The effect of this example will be described. In this example, the sealing performance of the refrigerant 11 can be enhanced at the central portion 38 of the cooling pipe 3. When the laminated body 10 is fixed using the bolts 5, it is difficult to apply the fastening force of the bolts 5 at the central portion 38, and the gap between the pair of outer shell members 31 is likely to widen, but in this example, the refrigerant 11 at the central portion 38. Therefore, the refrigerant can be prevented from leaking from the central portion 38.

Moreover, in this example, since the flange part 33 is thick in the center part 38, it becomes possible to raise the rigidity of the outer shell member 31 compared with the case where the thickness of the flange part 33 is uniform.
In addition, the same effects as those of the first embodiment are obtained.

  In this example, the thickness of the flange portion 33 is increased at the central portion 38 so that the surface 335 protrudes toward the gasket 32. However, the thickness of the flange portion 33 is made uniform and curved. By doing so, the surface 335 of the flange portion 33 may protrude toward the gasket 32 side. In this example, only one outer shell member 31a out of the two outer shell members 31a and 31b has the surface 335 projecting toward the gasket 32 at the central portion 38, but the two outer shell members 31a. , 31b may have such a structure.

(Example 3)
In this example, the structure of the cooling pipe 3 is changed. As shown in FIG. 11, in this example, two semiconductor modules 2 are arranged at a predetermined interval in the Y direction. Then, a pair of through holes 35 are formed between the two semiconductor modules 2, that is, in the central portion 38 of the cooling pipe 3 in the Y direction. The laminated body 10 was fixed to the fixed part 4 by inserting the bolt 5 (see FIG. 1) into the through hole 38. The pair of through holes 35 are formed in the flange portion 33 of the outer shell member 31 so as to sandwich the bulging portion 34 from the Z direction. And as shown in FIG. 12, the thickness in the X direction of the gasket 32 was made thicker toward the both ends 37 from the center part 38 in the Y direction.
In addition, the same configuration as that of the first embodiment is provided.

  The effect of this example will be described. In this example, since the thickness of the gasket increases from the central portion 38 in the Y direction toward the both end portions 37, the sealing performance of the refrigerant 11 at the both end portions 37 can be improved. When the laminated body 10 is bolted at the central portion 38 of the cooling pipe 3, the fastening force of the bolt 5 is less likely to be applied to the portions (both ends 37) away from the bolt 5, and the gap between the pair of outer shell members 31 is widened. Although it becomes easy, in this example, since the sealing performance of the both end portions 37 can be improved, a problem that the refrigerant 11 leaks from the both end portions 37 can be prevented.

Further, when the laminated body 10 is bolted at the central portion 38 of the cooling pipe 3, the length in the Y direction of the cooling pipe 3 can be shortened as compared with the case where both end portions 37 are bolted (see FIG. 2). . Therefore, it becomes easy to reduce the size of the power conversion device 1.
In addition, the same effects as those of the first embodiment are obtained.

DESCRIPTION OF SYMBOLS 1 Power converter 10 Laminated body 2 Semiconductor module 3 Cooling pipe 30 Refrigerant flow path 31 Outer shell member 33 Flange part 34 Swelling part 35 Through-hole 4 Fixed part 5 Bolt

Claims (5)

A laminated body in which a plurality of semiconductor modules in which power terminals protrude from a main body portion in which a semiconductor element is sealed, and a plurality of cooling pipes through which a coolant for cooling the semiconductor modules flows;
A fixed portion to which the laminate is fixed at one end in the stacking direction of the laminate,
Each of the cooling pipes has a pair of outer shell members arranged opposite to each other in the stacking direction, and an annular gasket interposed between the pair of outer shell members,
The pair of outer shell members include a flange portion that is overlapped with the gasket sandwiched therebetween, and a bulge portion that bulges from the inside of the flange portion toward the opposite side in the stacking direction. And the refrigerant flow path through which the refrigerant flows is formed between the bulging portions of the pair of outer shell members arranged opposite to each other, and the pair of outer shell members are pressed against each other via the gasket,
A plurality of through holes penetrating in the stacking direction are formed in the flange portion of the cooling pipe, and bolts are inserted into the through holes of the plurality of outer shell members in the stacked body to be formed in the fixed member. By screwing the bolt into the female screw part, the laminated body is fixed to the fixed part while pressing in the laminating direction,
A configuration in which the portion of the plurality of bolts that is away from the nearest bolt is thicker in the stacking direction of the gasket or the surface of the flange portion that contacts the gasket protrudes toward the gasket. The power converter characterized by being made.   2. The power converter according to claim 1, wherein a pair of the through holes are formed at both ends of the cooling pipe in a width direction orthogonal to both the protruding direction of the power terminal and the stacking direction, and the width direction is defined. The thickness of the gasket in the stacking direction increases as it goes from the both end portions to the center portion, or the surface of the flange portion that contacts the gasket protrudes toward the gasket. A power converter.   2. The power converter according to claim 1, wherein a pair of the through holes are formed in a central portion of the cooling pipe in a width direction orthogonal to both the protruding direction of the power terminal and the stacking direction, and the width direction The thickness of the gasket in the stacking direction increases as it goes from the center to both ends, or the surface of the flange that contacts the gasket protrudes toward the gasket. A power converter.   4. The power conversion device according to claim 1, wherein a portion of the plurality of bolts away from the nearest bolt is configured such that a thickness of the gasket in the stacking direction increases. The power converter characterized by being made.   4. The power conversion device according to claim 1, wherein a surface of the flange portion that is in contact with the gasket is closer to the gasket side at a portion away from the nearest bolt among the plurality of bolts. It is comprised so that it may protrude in, and the power converter device characterized by the above-mentioned.

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