JP2013126297A - Power conversion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device that productively facilitates disassembly of a case while maintaining sealing performance of the case.SOLUTION: A power conversion device 1 includes a device body part and the case. The case comprises a combination of a first case body 31 and a second case body 32. The first case body 31 and the second case body 32 have a first flange portion 311 and a second flange portion 321, respectively. The second flange portion 321 has an internally threaded portion 322 formed therethrough. The first flange portion 311 has a bolt abutting surface 312. The bolt abutting surface 312 is formed in a position farther from the second flange portion 321 than a sealing surface 313 of the first flange portion 311 where a sealing material 4 is arranged.

Description

  The present invention relates to a power conversion device including a device main body and a case for housing the device main body.

For example, electric vehicles, hybrid vehicles, and the like are equipped with power conversion devices such as inverters and converters for converting power supply power into drive power for driving a drive motor.
Here, in order to prevent moisture from entering the case from the outside, the power conversion device needs to seal between the case main body and the lid constituting the case of the power conversion device.
Therefore, for example, in Patent Document 1, when manufacturing the power conversion device, a liquid gasket is applied to the sealing surface of the case body with the lid body, and the lid body is placed thereon and bolted to the case body. Thus, a power conversion device that ensures sealing performance is disclosed.

JP 2010-59941 A

  However, for example, in-process defects in the manufacturing process of the power conversion device or parts replacement at the time of maintenance, etc., it may be necessary to disassemble the case main body and the lid member after assembly. In this case, since the sealing surface of the case main body and the lid member is bonded by a liquid gasket, it is difficult to disassemble the case.

  Therefore, for example, a method is conceivable in which a flathead screwdriver or the like is inserted into the sealing surface from between the case main body and the lid member, and the both are disassembled so as to open. However, in this case, the seal surface is likely to be scratched, and this scratch may cause a decrease in sealing performance on the seal surface.

  In addition, the case body and the lid member are provided with flange portions that are opposed to each other with a sealant interposed therebetween, and the case body and the lid member are provided on the flange portion on the lid member side. It is also conceivable to form a female thread portion for screwing a disassembling bolt for pulling apart. Then, during the disassembling work, the disassembling bolt is screwed in from the lid material side so that the tip part comes into contact with the flange part on the case body side, and the lid material is pulled away from the case body as the tip part projects. A method of decomposing both is also conceivable. However, in this case, a burr may occur at a portion of the flange portion on the case body side where the tip portion abuts.

  Thus, in the case main body, if a burr protruding from the sealing surface with the lid member remains, a burr protrudes between the case main body and the lid member when the case main body and the lid member are bonded again. There may be gaps in minutes. As a result, the sealing performance of the power conversion device may be reduced.

  In order to prevent such a problem, it may be considered to remove burrs after the operation of disassembling the power converter case. However, in this case, the number of man-hours increases, and the productivity of the power conversion device may be reduced.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a highly productive power converter that can be easily disassembled while maintaining the sealing performance of the case.

One aspect of the present invention is a power conversion device including a device main body and a case that houses the device main body,
The case is configured by combining at least a first case body and a second case body,
The first case body and the second case body each include a first flange portion and a second flange portion that are opposed to each other with a sealant interposed therebetween,
The second flange portion is formed with a female screw portion through which a disassembling bolt for separating the first case body and the second case body, which are overlapped with each other, is threaded.
The first flange portion has a bolt abutting surface for abutting a tip end portion of a disassembling bolt screwed into the female screw portion,
The bolt contact surface is formed at a position farther from the second flange portion than a seal surface on which the sealing material is disposed in the first flange portion. ).

  In the power converter, the female thread portion is formed through the second flange portion, and the first flange portion has the bolt contact surface. Accordingly, when the case is disassembled, the second case body can be easily pulled away from the first case body. That is, at the time of disassembling work, the disassembling bolt is screwed into the female screw portion of the second flange portion, and the tip portion is brought into contact with the bolt contact surface of the first flange portion. Then, by continuing the screwing of the disassembling bolt, the second case body can be pulled away from the first case body with the protrusion of the tip portion. As a result, the case can be easily disassembled.

  And the said bolt contact surface is formed in the position far from the said 2nd flange part rather than the sealing surface which has arrange | positioned the said sealing material in the said 1st flange part. As a result, the tip of the disassembling bolt comes into contact with the bolt contact surface, and even if burr is generated on the bolt contact surface by sliding under a large pressure, the burr is removed from the seal surface. Protruding can be prevented. That is, when the first case body and the second case body are bonded again, it is possible to prevent a gap due to the burr protrusion from occurring between the first case body and the second case body. As a result, the sealing performance of the sealing surface when the first case body and the second case body are bonded again can be maintained.

  Moreover, since it is possible to prevent the burrs from protruding from the sealing surface, it is not necessary to provide a step of removing the burrs after the above-described case disassembly work. As a result, productivity and maintainability of the power converter can be improved.

  As described above, according to the above aspect, it is possible to provide a highly productive power conversion device that can be easily disassembled while maintaining the sealing performance of the case.

Explanatory drawing by the perspective of the power converter device in Example 1. FIG. Explanatory drawing by the plane of the power converter device of the state which removed the 2nd case body and the sealing material in Example 1 from the 1st case body virtually. The expansion explanatory view by the side of the power converter seen from the A direction of FIG. In Example 1, (A) Partial expansion explanatory drawing by the plane of a 2nd case body, (B) Partial expansion explanatory drawing by the plane of a 1st case body. (A) Enlarged explanatory view of the first flange portion and the second flange portion in the sealed state, using the cross-sectional view taken along the line BB in FIG. The expansion explanatory view of the 1st flange part and the 2nd flange part, (C) The expansion explanatory view of the 1st flange part and the 2nd flange part of an exploded state. (A) Enlarged explanatory view of the first flange portion and the second flange portion in the sealed state, using the cross-sectional view taken along the line B-B in FIG. 3 in Example 2, (B) At the time of screwing the disassembly bolt The expansion explanatory view of the 1st flange part and the 2nd flange part, (C) The expansion explanatory view of the 1st flange part and the 2nd flange part of an exploded state. Explanatory drawing equivalent to FIG. 4 (B) of the 1st case body in Example 3. FIG. (A) Enlarged explanatory view of the first flange portion and the second flange portion in the sealed state using the cross-sectional view taken along the line BB in FIG. 3 in Example 3, (B) At the time of screwing the disassembling bolt The expansion explanatory view of the 1st flange part and the 2nd flange part, (C) The expansion explanatory view of the 1st flange part and the 2nd flange part of an exploded state. (A) Enlarged explanatory view of the first flange portion and the second flange portion at the time of screwing the disassembling bolt, using the sectional view taken along the line BB in FIG. Expansion explanatory drawing of a 1st flange part and a 2nd flange part. Explanatory drawing equivalent to FIG. 3 of the power converter device in Example 5. FIG. In Example 5, the enlarged explanatory view of the 1st flange part and the 2nd flange part of the seal state using the BB line arrow sectional view of Drawing 3.

  Moreover, it is preferable that the said bolt contact surface is formed in the bottom face of the recessed part opened to the said seal surface (Claim 2). In this case, during the disassembly work, the tip of the disassembly bolt comes into contact with the bolt contact surface and slides under a large pressure to generate burrs on the bolt contact surface. Even if the burr falls off from the first flange portion, the burr can be retained inside the recess. This prevents burrs from adhering to the sealing surface and causing a reduction in sealing performance, or prevents the occurrence of an electrical failure of the power converter due to the burrs falling around the case. be able to.

  Moreover, it is preferable that the said bolt contact surface is formed in the taper shape which leaves | separates from the said seal surface toward the center side from the outer peripheral side of the bottom face of the said recessed part (Claim 3). In this case, when the tip of the disassembly bolt is brought into contact with the bolt contact surface during disassembly work, the bottom surface of the concave portion, which is the bolt contact surface, is formed in the tapered shape, thereby The contact area between the part and the bolt contact surface can be reduced. Therefore, friction at the time of screwing of the disassembling bolt can be reduced, and the second case body can be easily pulled away from the first case body. As a result, the case can be more easily disassembled.

  Further, the bottom surface of the concave portion may have a raised portion raised at a central portion, and the bolt contact surface may be formed at the top of the raised portion. In this case, when the tip of the disassembling bolt is brought into contact with the bolt contact surface during the disassembling work, the contact area between the tip and the bolt contact surface can be reduced. Therefore, friction at the time of screwing of the disassembly bolt can be reduced, and the second case body can be easily separated from the first case body. As a result, the case can be more easily disassembled.

Example 1
The power converter according to the embodiment will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the power conversion device 1 of this example includes a device main body 2 and a case 3 that accommodates the device main body 2.
The case 3 is configured by combining a case main body 31 as a first case body and a lid body 32 as a second case body.

The case main body 31 and the lid body 32 include a first flange portion 311 and a second flange portion 321 that are opposed to each other with the sealant 4 interposed therebetween.
As shown in FIGS. 3 to 5, the second flange portion 321 is formed with a female screw portion 322 through which the disassembling bolt 5 for separating the case body 31 and the lid body 32 that are overlapped with each other is screwed. Has been.
The first flange portion 311 has a bolt abutting surface 312 that abuts the distal end portion 51 of the disassembling bolt 5 screwed into the female screw portion 322.

The bolt contact surface 312 is formed at a position farther from the second flange portion 321 than the seal surface 313 on which the sealing material 4 is disposed in the first flange portion 311.
Further, the bolt contact surface 312 is formed on the bottom surface of the recess 314 opened in the seal surface 313.

1 and 2, the case 3 has a substantially rectangular parallelepiped shape, and the case main body 31 has a shape in which one surface of the substantially rectangular parallelepiped shape is opened. A first flange portion 311 is formed on the entire circumference of the opening 310.
And the cover body 32 is formed in the shape which can block the opening part 310 of the case main body 31, and has the 2nd flange part 321 overlapped with the 1st flange part 311 in a perimeter. Thereby, the opening part 310 of the case main body 31 which accommodated the apparatus main body part 2 can be sealed by the lid body 32.
The apparatus main body 2 includes electronic components such as a semiconductor module constituting a power conversion circuit, a cooler for cooling them, and the like, but the apparatus main body 2 shown in FIG.

  Moreover, as shown in FIGS. 1-4, the 1st flange part 311 and the 2nd flange part 321 are the 1st fixing for fixing the case main body 31 and the cover body 32 to each other with a fixing bolt (not shown). A plurality of parts 318 and a plurality of second fixing parts 323 are provided. That is, the first fixing portion 318 is formed with a fixing female screw portion 319 for screwing the fixing bolt, and the second fixing portion 323 is formed with an insertion hole 324 for inserting the fixing bolt.

A plurality of first fixing portions 318 and second fixing portions 323 are formed in the first flange portion 311 and the second flange portion 321, respectively.
Further, a pair of the bolt contact surface 312 and the female screw portion 322 are disposed in the vicinity of the diagonal portion of the case 3 (see FIGS. 1 and 2).

  The case body 31 and the lid body 32 form the case 3 by overlapping the seal surface 313 between the first flange portion 311 and the second flange portion 321 via a seal material 4 such as FIPG, for example. Yes. The case body 31 and the lid body 32 are fixed to each other by being fastened by fixing bolts in the plurality of first fixing portions 318 and second fixing portions 323.

And in the case of the in-process defect of the manufacturing process of the power converter device 1, the parts exchange at the time of maintenance, etc., it is necessary to disassemble the case 3 and to expose the apparatus main body 2.
When disassembling the case 3, as shown in FIG. 5B, the disassembling bolt 5 is screwed into the female threaded portion 322 of the second flange portion 321 from the lid 32 side, and the tip of the disassembling bolt 5 is inserted. The portion 51 is positioned in the recess 314 of the first flange portion 311 on the case body 31 side. Then, the tip 51 is brought into contact with the bottom surface of the recess 314 which is the bolt contact surface 312 and the disassembling bolt 5 is continuously screwed. As a result, as shown in FIG. 5C, the lid body 32 is pulled away from the seal surface 313 of the case body 31 with the protrusion 51 of the disassembling bolt 5 toward the case body 31. The case main body 31 and the lid body 32 can be disassembled by screwing the disassembling bolt 5 at the two female screw portions 322 and the bolt contact surface 312.

  At this time, the first flange portion 311 and the second flange portion 321 in this example are arranged in pairs near the diagonal portion in the case 3 (see FIGS. 1 and 2). Accordingly, the lid 32 can be pulled away from the case body 31 in a well-balanced manner when the case 3 is disassembled.

Next, the effect of the power converter device 1 of this example is demonstrated using FIG.
In the power converter 1, as shown in FIG. 5A, the second flange portion 321 is formed with a female screw portion 322 passing therethrough, and the first flange portion 311 has a bolt contact surface 312. Yes. As a result, the lid 32 can be easily pulled away from the case body 31 when the case 3 is disassembled. That is, as shown in FIGS. 5A to 5C, during the disassembling operation, the disassembling bolt 5 is screwed from the female threaded portion 322 of the second flange portion 321, and the tip portion 51 is moved to the first flange portion 311. It abuts on the bolt abutment surface 312. Then, by continuing the screwing of the disassembling bolt 5, the lid body 32 can be pulled away from the case main body 31 as the tip 51 protrudes. As a result, the case 3 can be easily disassembled.

As shown in FIG. 5A, the bolt contact surface 312 is formed at a position farther from the second flange portion 321 than the seal surface 313 on which the sealing material 4 is disposed in the first flange portion 311. As a result, as shown in FIG. 5 (C), the tip 51 of the disassembling bolt 5 comes into contact with the bolt contact surface 312 and slides under a large pressure to cause burrs on the bolt contact surface 312. Even if it occurs, it is possible to prevent the burr from protruding from the sealing surface 313. That is, when the case main body 31 and the lid body 32 are bonded again, it is possible to prevent a gap due to the protrusion of the burr between the two. As a result, the sealing performance of the sealing surface 313 when the case main body 31 and the lid body 32 are bonded again can be maintained.
Further, since it is possible to prevent the burrs from protruding from the seal surface 313, it is not necessary to provide a step of removing the burrs after the case 3 is disassembled. As a result, productivity and maintainability of the power conversion device 1 can be improved.

  Moreover, the bolt contact surface 312 in this example is formed in the bottom face of the recessed part 314 opened to the seal surface 313, as shown in FIGS. As a result, during the disassembling operation, as described above, burrs are generated on the bolt contact surface 312, and even if the burrs drop off from the first flange portion 311, the burrs can be retained inside the recess 314. This prevents burrs from adhering to the seal surface 313 and causing a decrease in sealing performance, and prevents the occurrence of electrical failure of the power conversion device 1 due to the burrs falling around the case 3. Can do.

  As described above, according to the above aspect, it is possible to provide a highly productive power conversion device that can be easily disassembled while maintaining the sealing performance of the case.

(Example 2)
In this example, as shown in FIG. 6, the shape of the bottom surface of the recess 314 is formed in a tapered shape.
Specifically, the bolt contact surface 312 is formed in a taper shape so as to move away from the seal surface 313 from the outer peripheral side to the center side of the bottom surface of the recess 314. That is, the bottom surface of the recess 314 is formed in a substantially conical shape.
Others are the same as in the first embodiment.

In the case of this example, when the front end portion 51 of the disassembling bolt 5 is brought into contact with the bolt contact surface 312 during the disassembly operation, the bolt contact surface 312 is shown as shown in FIGS. By forming the bottom surface of the recess 314 in the tapered shape, the contact area between the tip 51 and the bolt contact surface 312 can be reduced. Therefore, friction at the time of screwing the disassembling bolt 5 can be reduced, and the lid body 32 can be easily separated from the case main body 31. As a result, the case 3 can be disassembled more easily.
In addition, the same effects as those of the first embodiment are obtained.

(Example 3)
In this example, as shown in FIGS. 7 and 8, a bolt contact surface 312 is formed on the top portion 317 of the raised portion 316 on the bottom surface of the concave portion 314.
As shown in FIGS. 7 and 8A, the bottom surface of the concave portion 314 in this example has a raised portion 316 raised at the center portion. The bolt contact surface 312 is formed on the top 317 of the raised portion 316.
Others are the same as in the first embodiment.

In the case of this example, when the tip 51 of the disassembling bolt 5 is brought into contact with the bolt contact surface 312 during the disassembling work, as shown in FIGS. The contact area with the surface 312 can be reduced. Therefore, friction at the time of screwing the disassembly bolt 5 can be reduced, and the lid body 32 can be easily pulled away from the case main body 31. As a result, the case 3 can be disassembled more easily.
In addition, the same effects as those of the first embodiment are obtained.

Example 4
In this example, as shown in FIG. 9, a tip recess 510 is formed on the tip surface of the tip 51 of the disassembling bolt 5.
The disassembling bolt 5 in this example comes into contact with the bolt contact surface 312 in an annular shape at the outer peripheral edge of the tip portion 51.
Others are the same as in the first embodiment.

In the case of this example, when the tip 51 of the disassembling bolt 5 is brought into contact with the bolt contact surface 312 during the disassembling work, as shown in FIGS. The contact area with the contact surface 312 can be reduced. Therefore, friction at the time of screwing the disassembly bolt 5 can be reduced, and the lid body 32 can be easily pulled away from the case main body 31. As a result, the case 3 can be disassembled more easily.
In addition, the same effects as those of the first embodiment are obtained.

(Example 5)
In this example, as shown in FIGS. 10 and 11, the bolt contact surface 312 is formed on the step portion 315 of the first flange portion 311.
As shown in FIGS. 10 and 11, the first flange portion 311 in this example is formed by forming a step portion 315 that is further away from the second flange portion 321 than the seal surface 313, outside the seal surface 313. A bolt contact surface 312 is formed on the step portion 315.
Others are the same as Example 1, and have the same effect.

DESCRIPTION OF SYMBOLS 1 Power converter 2 Apparatus main-body part 3 Case 31 1st case body (case main body)
311 1st flange part 312 Bolt contact surface 32 2nd case body (lid body)
321 Second flange part 322 Female thread part 4 Sealing material

Claims (4)

A power conversion device comprising a device main body and a case for housing the device main body,
The case is configured by combining at least a first case body and a second case body,
The first case body and the second case body each include a first flange portion and a second flange portion that are opposed to each other with a sealant interposed therebetween,
The second flange portion is formed with a female screw portion through which a disassembling bolt for separating the first case body and the second case body, which are overlapped with each other, is threaded.
The first flange portion has a bolt abutting surface for abutting a tip end portion of a disassembling bolt screwed into the female screw portion,
The bolt contact surface is formed at a position farther from the second flange portion than the seal surface on which the seal material is disposed in the first flange portion.   The power conversion device according to claim 1, wherein the bolt contact surface is formed on a bottom surface of a recess opening in the seal surface.   The power conversion device according to claim 2, wherein the bolt contact surface is formed in a tapered shape so as to move away from the seal surface from the outer peripheral side to the center side of the bottom surface of the recess. Power conversion device.   3. The power converter according to claim 2, wherein the bottom surface of the concave portion has a raised portion raised at a central portion, and the bolt contact surface is formed at the top of the raised portion. Conversion device.

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