JP2021035265A - Power conversion device - Google Patents

Abstract

To reduce the number of screws, and manufacture a housing with a small number of man-hours.SOLUTION: A power conversion device includes a first member 20 and a second member 30 constituting a housing 10. The housing 10 includes a first connecting portion that connects the first member 20 and the second member 30 by an uneven structure formed between the first member and the second member, and a second connecting portion that connects the first member 20 and the second member 30 by pins 41 that are inserted into the first member and the second member. The pin of the second connecting portion regulates the movement in a direction in which the first member and the second member are detached in the uneven structure.SELECTED DRAWING: Figure 6

Description

The present invention relates to a power converter.

Conventionally, the housing of a power conversion device is composed of a plurality of members made of sheet metal, plastic, or the like, and each member is joined by screwing (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-109748

As described above, since a plurality of members are joined by screwing, there is a problem that man-hours and labor increase at the time of manufacturing.

An object of the present invention is to reduce the number of screw points, simplify manufacturing, and manufacture a housing with a small number of man-hours.

The power conversion device according to the present invention is
With the first member and the second member that make up the housing,
The housing is
A first connecting portion that connects the first member and the second member by an uneven structure formed between the first member and the second member.
It has a second connecting portion that connects the first member and the second member with a pin inserted into the second member.
In the concave-convex structure, the pin of the second connecting portion regulates the movement of the first member and the second member in the direction of detachment.

According to the present invention, the number of screw points can be reduced, manufacturing can be facilitated, and the housing can be manufactured with a small number of man-hours.

It is a perspective view of the power conversion apparatus which concerns on this embodiment. It is a top view of the power conversion apparatus which concerns on this embodiment. It is a perspective view of the first member. It is a perspective view of the 2nd member. It is a perspective view of the 2nd member seen from the direction different from FIG. It is a perspective view of the joint part of the 1st member and the 2nd member. It is a perspective view of the first member and the second member which were connected. It is a perspective view which looked at the combined 1st member and 2nd member from the bottom side. It is a perspective view seen from the bottom side which shows the state which the heat sink is inserted into the combined 1st member and 2nd member. It is a perspective view seen from the upper side which shows the state which the heat sink is inserted into the combined 1st member and 2nd member. It is a perspective view seen from the upper side which shows the state which the substrate is mounted on the 1st member and 2nd member of the coupled state in which a heat sink is inserted. It is a perspective view of the upper surface side of a driver module. It is a perspective view of the bottom side of a driver module. It is a perspective view of the state in which the driver module is mounted on the 1st member and the 2nd member in the coupled state in which the heat sink is inserted. It is a perspective view of the state in which the driver module is mounted on the 1st member and the 2nd member in the coupled state in which the heat sink is inserted.

[Outline of Embodiment of the Invention]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present embodiment is a power conversion device including a switching element such as an inverter and a converter. FIG. 1 is a perspective view of the power conversion device 1, and FIG. 2 is a plan view.

As shown in the figure, the power conversion device 1 is a substantially rectangular parallelepiped, and mainly includes a housing 10, a driver module 80, and a heat sink 90.
In the following description, the short side direction in the plan view of the power conversion device 1 is the X-axis direction, the longitudinal direction in the plan view is the Y-axis direction, and the direction orthogonal to these is the Z-axis direction. Further, as shown in FIG. 1, one in the X-axis direction is "left", the other is "right", one in the Y-axis direction is "front", the other is "rear", and one in the Z-axis direction is "rear". The other is defined as "top" and the other as "bottom".

[Case]
The housing 10 includes a first member 20, a second member 30, a first cover 11, and a second cover 12.
FIG. 3 is a perspective view of the first member 20, FIG. 4 is a perspective view of the second member 30, and FIG. 5 is a perspective view of the second member 30 as viewed from different directions.

[First member]
As shown in FIGS. 1 and 3, the first member 20 constitutes the first half of the housing 10. The first member 20 is made of sheet metal or plastic molding.
In the first member 20, the front wall portion 21, the left wall portion 22, and the right wall portion 23 are integrated in a U-shape in a plan view. A floor plate 24 is provided at an intermediate height in the Z-axis direction inside these. Four circular through holes 241 are formed in the floor plate 24.

At the rear end of the left wall portion 22, an extension portion 221 is provided in which the upper portion and the lower portion are cut out and the width in the Z-axis direction is narrowed. A plate-shaped portion 222 having a thick wall surface is provided at the lower end of the inner side surface (right surface) of the extending portion 221.

At the rear end of the right wall portion 23, an extension portion 231 whose upper half is cut out and whose width in the Z-axis direction is narrowed is provided. A ridge portion 232 along the X-axis direction is formed on the inner surface of the extension portion 231.

[Second member]
As shown in FIGS. 1, 4 and 5, the second member 30 constitutes the latter half of the housing 10. The second member 30 is made of sheet metal or plastic molding.
In the second member 30, the rear wall portion 31, the left wall portion 32, and the right wall portion 33 are integrated in a U-shape in a plan view. A bottom plate 34 is provided inside these.

The lower half of the rear wall portion 31 has an opening 311 formed over substantially the entire width in the X-axis direction, and the rear cover 312 is fitted in the opening 311 (FIG. 4 shows the rear cover 312). Is omitted).

The left wall portion 32 is provided with a plate-shaped portion 322 having a thick wall surface in the lower half thereof. The plate-shaped portion 322 has a thickness equal to that of the plate-shaped portion 222 of the first member 20 described above. The front end portion of the plate-shaped portion 322 is lowered by one step to form a stepped portion 321 extending forward.

The upper half of the right wall portion 33 is notched as a whole except for the rear end portion, and the outer surface (right surface) of the front end portion has a thin wall surface as if it was scraped from the outside. A thin-walled portion 331 is formed. Further, in the thin-walled portion 331, a slit portion 332 that opens toward the front is formed along the Y-axis direction.

[Connecting structure of the first member and the second member]
FIG. 6 is a perspective view of a joint portion between the first member 20 and the second member 30, and FIG. 7 is a perspective view of the combined first member 20 and the second member 30.
The extending portion 231 of the rear end portion of the right wall portion 23 of the first member 20 can be fitted from the right side into the thin-walled portion 331 of the right wall portion 33 of the front end portion of the second member 30. At this time, the convex portion 232 formed in the extending portion 231 fits into the slit portion 332 formed in the thin-walled portion 331.
In this way, the right wall portion 23 of the first member 20 and the right wall portion 33 of the second member 30 are joined by fitting the concave-convex structure. However, in the above-mentioned uneven structure, the right wall portion 23 of the first member 20 and the right wall portion 33 of the second member 30 move in a direction in which they are separated from each other in the Y-axis direction or the X-axis direction, so that they are separated from each other in the Y-axis direction or the X-axis direction. Can be separated.
The ridge portion 232 and the slit portion 332 form a first connecting portion that connects each other by a concavo-convex structure formed between the first member 20 and the second member 30.

On the other hand, the plate-shaped portion 222 of the left wall portion 22 of the first member 20 can be overlapped with the step portion 321 of the left wall portion 32 of the second member 30 from above. Then, in a state where these are overlapped, two insertion holes 223 and 323 of pins 41 having the same arrangement in a plan view are formed in the plate-shaped portion 222 and the step portion 321 side by side in the Y-axis direction. ..

The insertion hole 223 is formed to penetrate the plate-shaped portion 222 in the Z-axis direction, and the insertion hole 323 is formed to penetrate the step portion 321 in the Z-axis direction.
The pins 41 inserted into these insertion holes 223 and 323 include a shaft-shaped portion 411 to be inserted and a head portion 412 having an outer diameter larger than that of the shaft-shaped portion 411.
A counterbore 224 as a recess is formed on the upper surface of the plate-shaped portion 222 and around the insertion hole 223. As shown in FIG. 7, when the pin 41 is inserted, the head 412 is formed. It is fitted in the counterbore 224 so that the upper end surface of the pin 41 and the upper surface of the plate-shaped portion 222 are flush with each other (same height).
The insertion hole 223 and the insertion hole 323 form a second connecting portion that connects the first member 20 and the second member 30 by a pin 41.

As described above, the right wall portion 23 of the first member 20 and the right wall portion 33 of the second member 30 are connected by fitting the concave-convex structure, but in this concave-convex structure, the right side of the first member 20 The wall portion 23 and the right wall portion 33 of the second member 30 have a structure that allows mutual movement in the X-axis direction and the Y-axis direction.
On the other hand, the two pins 41 penetrate the plate-shaped portion 222 of the left wall portion 22 of the first member 20 and the step portion 321 of the left wall portion 32 of the second member 30 in the Z-axis direction. It is connected. Therefore, the movement of the first member 20 and the second member 30 is restricted in the X-axis direction and the Y-axis direction.
Therefore, the left wall portion 22 of the first member 20, the left wall portion 32 of the second member 30, the right wall portion 23 of the first member 20, and the right wall portion 33 of the second member 30 are all maintained in a bonded state. , It is possible to firmly and effectively connect the first member 20 and the second member 30.

[heat sink]
FIG. 8 is a perspective view of the combined first member 20 and second member 30 as viewed from the bottom side, and FIG. 9 is a bottom portion showing a state in which the heat sink 90 is inserted into the combined first member 20 and second member 30. A perspective view seen from the side, FIG. 10 is a perspective view seen from the upper side showing a state in which the heat sink 90 is inserted into the combined first member 20 and second member 30.
The combined first member 20 and second member 30 are provided with a rectangular insertion slot 13 on the bottom side thereof for inserting the heat sink 90 from the front to the rear.

The heat sink 90 is a rectangular parallelepiped member made of a material having high thermal conductivity, and the shape and dimensions of the heat sink 90 when viewed from the Y-axis direction are substantially the same as those of the insertion slot 13.
Therefore, the entire heat sink 90 can be inserted into the housing 10 from the insertion slot 13.

The rear end of the heat sink 90 at the time of insertion is inserted up to the opening 311 of the second member 30.
Therefore, the heat sink 90 inserted into the insertion slot 13 has its front end held in the insertion slot 13 and its rear end held in the opening 311 and is constrained in the X-axis direction and the Z-axis direction. However, in the states of FIGS. 9 and 10, since the Y-axis direction is not constrained, it can be pulled forward.

Further, as shown in FIG. 10, the right side surface of the heat sink 90 in the inserted state abuts or approaches the inner side surface (left side surface) of the right wall portion 33 of the second member 30, and the right wall portion 33 is inside. It prevents the ridge portion 232 and the slit portion 332 from coming off from each other.
Further, the upper surface 91 of the heat sink 90 is flush with the upper surface (same height) of the plate-shaped portion 222 of the left wall portion 22, the plate-shaped portion 322 of the left wall portion 32, and the head 412 of the pin 41.

As shown in FIG. 11, when the first member 20 and the second member 30 are connected and the heat sink 90 is inserted, the substrate 42 is mounted on the upper surface of the floor plate 24 of the first member 20.
A capacitor (not shown) provided on the lower surface side of the substrate 42 is inserted into the four through holes 241 of the floor plate 24 described above.
Further, another substrate 43 is mounted at a position on the second member 30 above the rear end portion of the heat sink 90.

[Driver module]
FIG. 12 is a perspective view of the top surface side of the driver module 80, FIG. 13 is a perspective view of the bottom surface side, and FIG. 14 shows the driver module 80 mounted on the first member 20 and the second member 30 in the coupled state in which the heat sink 90 is inserted. It is a perspective view of the state.
The driver module 80 has a unit structure in which a substrate serving as a functional unit of the power conversion device is housed in the housing 81. The upper surface 811 of the housing 81 is widely opened to expose the inside.
Further, on the left surface 812 of the housing, a connector portion 82 exposed to the outside of the housing 10 extends to the left.

Further, in the center of the bottom surface 813 of the housing 81, two mounting holes 814 for mounting the driver module 80 to the heat sink 90 in the housing 10 are formed through in the Z-axis direction. The two mounting holes 814 are not shown in FIG.

As shown in FIG. 14, the driver module 80 is attached by screws 815 (see FIG. 2) that are inserted into the two attachment holes 814 so that the bottom surface 813 thereof is in close contact with the upper surface of the heat sink 90. Two screw holes 92 into which screws for mounting the driver module 80 are screwed are formed at positions on the upper surface 91 of the heat sink 90 that coincide with the two mounting holes 814 of the driver module 80 in a plan view.

Since the bottom surface 813 of the driver module 80 is in close contact with the upper surface 91 of the heat sink 90, the plate-shaped portion 222 of the left wall portion 22 and the plate-shaped portion 322 of the left wall portion 32 having the same height as the upper surface 91 of the heat sink 90. The upper surface of the head 412 of the pin 41 is in a state where the bottom surface 813 of the driver module 80 is in close contact with or close to each other.
As described above, since the heat sink 90 is constrained in the Z-axis direction, the screwed driver module 80 is also constrained in the Z-axis direction.
Therefore, the upper side of the two pins 41 that connect the first member 20 and the second member 30 is closed by the driver module 80, and the two pins 41 are constrained in the vertical direction.

Further, the right end portion of the driver module 80 is fitted into the recess 14 formed on the right side by connecting the first member 20 and the second member 30, and the connector portion 82 is the first member 20 and the second member 20. The members 30 are joined to fit into the recess 15 formed on the left side thereof.
Therefore, the driver module 80 is in a state of being constrained in the Y-axis direction. Therefore, the heat sink 90 connected to the driver module 80 by screwing is also restrained in the Y-axis direction, and is prevented from falling forward from the insertion slot 13.

Further, a first cover 11 is attached to the front side of the driver module 80 to close the upper part of the first member 20. Further, a second cover 12 is attached to the rear side of the driver module 80 to close the upper part of the second member 30.

[Technical Effects of Embodiments of the Invention]
The power conversion device 1 has a structure in which a pin 41 regulates movement in the X-axis direction and the Y-axis direction in which the first member 20 and the second member 30 are separated from each other in the insertion hole 223 and the ridge portion 232 forming the concave-convex structure. Therefore, it is possible to eliminate the need for screws for connecting the first member 20 and the second member 30, reducing the number of screw points, facilitating manufacturing, and reducing the man-hours for screwing and the work load. It becomes possible. Along with this, it is possible to reduce the manufacturing cost of the power conversion device 1.

Further, since two pins 41 are provided, it is possible to suppress the occurrence of rotation around the pin 41 and to satisfactorily and stably connect the first member 20 and the second member 30.
Further, since the pin 41 has a head 412 and has a structure in which the head 412 is accommodated in the counterbore hole 224, it is possible to easily realize a structure for preventing the pin 41 from being pulled out.

Further, since the power conversion device 1 has a structure in which the driver module 80 is fitted into the housing 10 from the outside, the driver module 80 can be stored and fixed at the same time, and the assembly can be easily performed. It will be possible.

Further, since the housing 10 has a structure having an insertion slot 13 for the heat sink 90, the heat sink 90 can be restrained in a direction orthogonal to the insertion direction, and the heat sink 90 can be easily attached. ..

Further, in the power conversion device 1, the driver module 80 is connected to the heat sink 90 by screwing, and the driver module 80 is restricted from moving in the direction of taking out the heat sink 90 from the insertion slot 13 with respect to the housing 10. Therefore, the driver module 80 and the heat sink 90 can be mutually fixed to the housing 10 by restraining each other.
Therefore, by screwing the driver module 80 to the heat sink 90, both of them can be fixed, the man-hours for mounting these work can be reduced, and the work efficiency can be improved.

Further, since the driver module 80 is attached to the housing 10 in an arrangement that restricts the removal of the pin 41, the attachment of the driver module 80 can restrain the pin 41 from coming off, and the pin 41 can be restrained. It is possible to give the connection the same level of reliability as screwing.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. That is, the details shown in the embodiment can be appropriately changed without departing from the spirit of the invention.

1 Power converter 10 Housing 11 First cover 12 Second cover 13 Insertion slot 14 Recess 15 Recess 20 First member 221 Extension part 223 Insert hole (second connection part)
224 Counterbore hole (recess)
231 Extension part 232 Convex part (first connection part)
241 Through hole 30 Second member 311 Opening 323 Insertion hole (second connecting part)
331 Thin-walled part 332 Slit part (first connecting part)
332 Slit part 41 Pin 411 Shaft-shaped part (insertion part)
412 Head 80 Driver Module 814 Mounting Hole 90 Heat Sink 92 Screw Hole

Claims (7)

With the first member and the second member that make up the housing,
The housing is
A first connecting portion that connects the first member and the second member by a concavo-convex structure formed between the first member and the second member.
It has a second connecting portion that connects the first member and the second member with a pin inserted into the second member.
A power conversion device in which the pin of the second connecting portion regulates movement in the direction in which the first member and the second member are separated from each other in the concave-convex structure. The power conversion device according to claim 1, which has a plurality of the pins. The pin has a head with an outer diameter larger than that of the insertion portion.
The power conversion device according to claim 1 or 2, wherein the first member and the second member have a recess for accommodating the head of the pin. The power converter includes a driver module and
The power conversion device according to any one of claims 1 to 3, wherein the driver module has a structure of being fitted into the housing from the outside. The power converter comprises a heat sink that dissipates heat from the driver module.
The power conversion device according to claim 4, wherein the housing has an insertion slot for the heat sink. The driver module is connected to the heat sink by screwing.
The power conversion device according to claim 5, wherein the driver module is restricted from moving in a direction in which the heat sink is taken out from the insertion slot by a structure that fits into the housing. The power conversion device according to any one of claims 4 to 6, wherein the driver module is attached to the housing in an arrangement that restricts the removal and removal of the pins.

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