JP6973008B2 - Power converter - Google Patents

Description

The present invention relates to a power conversion device, and more particularly to a power conversion device in which a part of a housing is exposed to the outside of a panel.

Conventionally, a power conversion device in which a part of a housing is exposed to the outside of a panel is known (see, for example, Patent Document 1).

The above-mentioned Patent Document 1 discloses a power conversion device used for controlling an elevator, an air conditioner, or the like. In this power conversion device, the semiconductor elements constituting the power conversion circuit are housed in the device main body (housing). The main body of the device is attached to a wall plate constituting the board so that a part of the device body is exposed to the outside of the board.

Further, in the conventional power conversion device as described in Patent Document 1, the housing of the power conversion device may have a divided structure extending from the outside of the panel to the inside of the panel. When the housing has a split structure, the seam of the housing is used to prevent liquid (water, etc.) from entering the inside of the housing (the space where the power conversion circuit is arranged) from the seam. , A sealing member is provided along the seam.

JP-A-2017-103933

Here, in the above-mentioned conventional power conversion device, when the seam portion and the sealing member are formed on the upper surface of the housing in which the liquid easily collects, when the liquid is applied to the upper surface of the housing, the liquid collected on the upper surface becomes the seam portion. It may pass through the end of the seal member inside the panel and enter the inside of the housing (the space where the power conversion circuit is arranged). If liquid enters the inside of the housing, the power conversion circuit may fail.

Therefore, it is conceivable to provide an additional sealing member at the end of the sealing member inside the panel to prevent liquid from entering the inside of the housing from the end of the sealing member inside the panel. However, when an additional sealing member is provided, there is a problem that the number of sealing members increases and the number of assembly steps increases due to the increase in the number of sealing members.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to suppress an increase in the number of sealing members and an increase in assembly man-hours due to an increase in the number of sealing members, while suppressing an increase in assembly man-hours. The present invention is to provide a power conversion device capable of suppressing the intrusion of liquid into the interior.

In order to achieve the above object, the power conversion device according to one aspect of the present invention is arranged so as to partially expose the outside of the panel through the opening of the wall portion that separates the inside and the outside of the panel. A housing that houses a power conversion circuit and at least along the seam on the upper surface of the housing, is formed from the outside to the inside of the panel together with the seam, and has a wall portion inside the panel. A sealing member having an end portion in the vicinity of the housing is provided, and a drainage groove passing through the seam portion is formed on the upper surface of the housing at a position corresponding to the wall portion.

In the power conversion device according to one aspect of the present invention, as described above, a drainage groove passing through the seam is formed at a position corresponding to the wall portion on the upper surface of the housing. As a result, even if a liquid (water or the like) is splashed on the upper surface of the housing, the splashed liquid can be smoothly discharged from the upper surface of the housing through the drainage groove. As a result, the drainage groove suppresses the accumulation of liquid on the upper surface of the housing, and the liquid gets over the end of the sealing member and enters the inside of the housing (the space where the power conversion circuit is housed). Since this can be suppressed, it is not necessary to provide an additional sealing member at the end of the sealing member inside the panel. As a result, it is possible to suppress the intrusion of liquid into the inside of the housing while suppressing the increase in the number of sealing members and the increase in assembly man-hours due to the increase in the number of sealing members. Further, by forming the drainage groove, the liquid can be stored in the drainage groove. As a result, when the same amount of liquid is accumulated on the upper surface of the housing, the amount of liquid accumulated in the drainage groove is accumulated on the upper surface (drainage groove) of the housing as compared with the case where the drainage groove is not formed. The water level of the liquid (the height position of the liquid) can be lowered. As a result, it is possible to further prevent the liquid from overcoming the end portion of the sealing member and entering the inside of the housing, so that the liquid does not need to be provided with an additional sealing member at the end portion of the sealing member inside the panel. It is possible to sufficiently suppress the invasion of the inside of the housing.

In the power conversion device according to the above one aspect, the drainage groove is preferably formed so as to extend in a direction intersecting the direction in which the seam extends. With this configuration, the liquid discharged (guided) by the drainage groove can flow in the direction away from the seam portion. As a result, while reducing the possibility that the liquid discharged by the drainage groove will enter the inside of the housing from the seam, the liquid will pass over the end of the sealing member and enter the inside of the housing by the drainage groove. Can be effectively suppressed.

In the power conversion device according to the above one aspect, the drain end of the drainage groove is preferably connected to the side surface of the housing. With this configuration, the liquid discharged from the drainage groove can be smoothly discharged to the side surface of the housing, so that the drainage property of the drainage groove can be improved. As a result, even when the amount of liquid applied to the upper surface of the housing is large, the liquid is surely suppressed from accumulating on the upper surface of the housing, and the liquid gets over the end portion of the sealing member and enters the inside of the housing. It is possible to surely suppress the invasion.

In this case, preferably, the drainage end on one side of the drainage groove is connected to the side surface of the housing, and the drainage end on the other side of the drainage groove is via an opening provided on the upper surface of the housing. It is connected to the inside of the housing. With this configuration, the liquid can be discharged at both ends of the drainage groove, so that the liquid discharged by the drainage groove can be discharged more smoothly. Further, if the drainage end on the other side of the drainage groove is connected to the inside of the housing (a space other than the space in which the power conversion circuit is housed) through an opening provided on the upper surface of the housing, the drainage groove can be connected. Since it is not necessary to form up to the side surface of the housing, the drainage groove itself can be made smaller. As a result, even when the drainage groove is provided, the manufacturability of the drainage groove can be improved.

In the configuration in which the drainage end of the drainage groove is connected to the side surface of the housing, the drainage groove is preferably formed in a linear shape. With this configuration, the drainage groove can be formed in a simple shape, so that the manufacturability of the drainage groove can be improved. Further, as compared with the case where a corner or a curved portion is formed in the drainage groove, the resistance when the liquid flows can be reduced, so that the drainage property of the drainage groove can be improved. can.

In the power conversion device according to the above one aspect, preferably, the outer side surface of the drainage groove is formed so as to be inclined downward from the upper surface of the housing toward the bottom surface of the drainage groove. With this configuration, when the liquid is splashed on the upper surface of the housing, the liquid on the upper surface of the housing can be positively guided to the bottom surface of the drainage groove by the inclined side surface of the drainage groove. As a result, it is possible to further suppress the accumulation of the liquid on the upper surface of the housing, so that it is possible to further suppress the liquid from getting over the end portion of the sealing member and entering the inside of the housing.

In the power conversion device according to the above one aspect, the depth of the drainage groove is preferably larger than the vertical distance between the upper surface of the outer surface of the housing and the end portion of the sealing member. With this configuration, even if the liquid collects on the upper surface of the housing and the drainage groove, the water level of the collected liquid can be lowered. As a result, it is possible to further prevent the liquid from getting over the end portion of the sealing member and entering the inside of the housing.

According to the present invention, as described above, it is possible to suppress the intrusion of liquid into the inside of the housing while suppressing the increase in the number of sealing members and the increase in assembly man-hours due to the increase in the number of sealing members.

It is a perspective view which looked at the power conversion apparatus by one Embodiment from the inside of a panel. It is an exploded perspective view which looked at the power conversion apparatus by one Embodiment from the inside of a panel. It is a perspective view which looked at the power conversion apparatus by one Embodiment from the outside of a panel. It is a partially enlarged view of FIG. It is a schematic cross-sectional view which shows the vicinity of the drainage groove of the power conversion apparatus by one Embodiment. It is a schematic cross-sectional view for demonstrating the invasion of a liquid into the inside of the housing of a power conversion apparatus by a comparative example. It is a schematic cross-sectional view for demonstrating the action effect of the drainage groove of the power conversion apparatus by one Embodiment. It is a perspective view which looked at the power conversion apparatus by the modification of one Embodiment from the outside of a panel.

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

First, with reference to FIGS. 1 to 3, the overall configuration of the power conversion device 100 according to the embodiment will be described. In the following description, the vertical direction is the Z direction, the upward direction is the Z1 direction, and the downward direction is the Z2 direction. Further, the X1 direction side is the outside of the board and the X2 direction side is the inside of the board with respect to the wall portion 201.

(Configuration of power converter)
As shown in FIGS. 1 to 3, the power conversion device 100 is a device that converts DC power or AC power into desired AC power. The power conversion device 100 is provided on a panel 200 (indicated by a two-dot chain line).

The power conversion device 100 includes a power conversion circuit 10 (see FIG. 2). The power conversion circuit 10 includes a semiconductor element 11 for power conversion. The semiconductor element 11 for power conversion, which is a heating element, is cooled by a metal cooling body 12 having heat dissipation fins. A cooling fluid (air or the like) is circulated through the cooling body 12 by, for example, a fan in order to promote heat dissipation.

Further, the power conversion device 100 includes a housing 20. The housing 20 houses the power conversion circuit 10 and the cooling body 12. The cooling body 12 is housed in a portion of the housing 20 on the outside of the panel and on the Y2 direction side. The power conversion circuit 10 straddles the outside portion and the inside portion of the housing 20 and is housed in the portion on the Y1 direction side. Inside the housing 20, the space in which the cooling body 12 is arranged and the space in which the power conversion circuit 10 is arranged are formed independently of each other. Further, the space in which the power conversion circuit 10 is arranged is sealed with respect to the space in which the cooling body 12 is arranged.

The housing 20 is arranged so as to straddle the inside and outside of the panel. Specifically, the housing 20 is arranged so that a part of the housing 20 is exposed to the outside of the panel through the opening 201a of the wall portion 201 that separates the inside and the outside of the panel. The wall portion 201 is a side wall portion constituting the board 200. A seal member 201c (see FIG. 5) for preventing liquid from entering the panel from outside the panel is provided on the inner edge 201b of the opening 201a of the wall 201a. The seal member 201c is formed in a circumferential shape along the inner edge portion 201b of the opening portion 201a of the wall portion 201. The seal member 201c is pressed from the inside of the panel toward the outside of the panel by the pressing portion 21 of the housing 20 formed inside the panel. The holding portion 21 of the housing 20 is formed in a circumferential shape at a position facing the edge portion 201b inside the board of the opening portion 201a of the wall portion 201 in the X direction.

The housing 20 is attached to the wall portion 201. Specifically, the housing 20 is attached to the wall portion 201 by a fastening member (male screw, nut, etc.) 203 via an L-shaped mounting member 202 (see FIG. 5) in a cross-sectional view.

The housing 20 has a divided structure. The housing 20 is divided in the Y direction parallel to the wall surface (YZ plane) of the wall portion 201 and orthogonal to the vertical direction. The housing 20 includes a first housing 22 that constitutes a portion of the housing 20 on the Y1 direction side, and a second housing 23 that constitutes a portion of the housing 20 on the Y2 direction side. In the housing 20, a seam portion 24 is formed at the abutting portion between the first housing 22 and the second housing 23. The seam portion 24 is formed in a circumferential shape over the upper surface 20a of the housing 20, the outer side surface 20b of the housing 20, the lower surface 20c of the housing 20, and the inner side surface 20d of the housing 20.

The housing 20 is provided with a seal member 25 along the seam portion 24. The seal member 25 is made of an elastomer (rubber or the like). The seal member 25 is formed in an elongated string shape. The seal member 25 has flexibility and is bendable. The seal member 25 is provided along the seam portion 24 on the upper surface 20a of the housing 20, the seam portion 24 on the outer side surface 20b of the housing 20, and the seam portion 24 on the lower surface 20c of the housing 20. The seal member 25 is formed in a substantially U shape when viewed from the side (viewed from the Y direction). The seal member 25 is fitted in the groove portion 23a provided along the seam portion 24 in the second housing 23.

Next, each configuration on the upper surface 20a side of the housing 20 will be described with reference to FIGS. 4 and 5. In the following description, unless otherwise specified, each configuration on the upper surface 20a side of the housing 20 is described.

As shown in FIGS. 4 and 5, on the upper surface 20a of the housing 20, the seam portion 24 and the sealing member 25 are formed so as to extend in the X direction intersecting (orthogonally) with the wall surface of the wall portion 201. The seam portion 24 and the seal member 25 are formed from the outside of the panel to the inside of the panel. The end portion (termination portion) 25a of the seal member 25 is arranged in the vicinity of the wall portion 201 in the panel. That is, the seal member 25 is placed in the panel and is formed only up to the vicinity of the wall portion 201. The end portion 25a of the seal member 25 is arranged at a position corresponding to the pressing portion 21 of the housing 20 (at a position substantially the same height as the pressing portion 21). The end portion 25a of the seal member 25 is arranged so as to face upward. The end portion 25a of the seal member 25 is arranged at a position higher than the upper surface 20a on the outer side of the board of the housing 20 by a distance L1 (for example, 3 mm).

Here, in the present embodiment, the upper surface 20a of the housing 20 has a seam portion 24 at a position corresponding to the wall portion 201 (a position near the wall portion 201, a position overlapping the wall portion 201 when viewed from the Z direction). A drainage groove 30 is formed. The drainage groove 30 is formed to promote the drainage of the liquid (rainwater or the like) from the upper surface 20a of the housing 20 when the liquid (rainwater or the like) is splashed on the upper surface 20a of the housing 20. The drainage groove 30 promotes the drainage of the liquid caught on the upper surface 20a of the housing 20 particularly in the vicinity of the wall portion 201. The drainage groove 30 is a flow path for draining the liquid caught on the upper surface 20a of the housing 20.

The drainage groove 30 is formed in a linear shape extending in the Y direction so that the liquid flows in the Y direction. The drainage groove 30 is formed so as to extend with a uniform width in a direction (Y direction, a direction along the wall surface of the wall portion 201) in which the seam portion 24 extends (X direction) and intersects (orthogonally). .. The drainage groove 30 is formed on one side of the Y direction with respect to the center of the Y direction so as to correspond to the seam portion 24 arranged on one side of the Y direction (Y1 direction side) with respect to the center of the Y direction. Has been done. The drainage groove 30 is formed from the vicinity of the center in the Y direction to the side surface 20e of the housing 20 on one side in the Y direction.

Further, in the present embodiment, the drainage groove 30 includes the drainage ends 30a and 30b formed on both sides in the Y direction, respectively. The drainage end 30a on one side (Y1 direction side) of the drainage groove 30 is connected to one side of the housing 20 in the Y direction and to the side surface 20e arranged outside the panel. That is, the drainage end 30a on one side of the drainage groove 30 is connected to the side surface 20e of the housing 20 closest to the seam portion 24 passing through the drainage groove 30. The drainage end 30b on the other side (Y2 direction side) of the drainage groove 30 is connected to the inside of the housing 20 via an opening 20f provided on the upper surface 20a of the housing 20. The opening 20f leads to a space in which the cooling body 12 inside the housing 20 is arranged (a space other than the space in which the power conversion circuit 10 inside the housing 20 is arranged). Since the cooling body 12 is not an electric component, unlike the power conversion circuit 10, there is no problem even if a liquid is applied.

As shown in FIG. 5, the drainage groove 30 is formed in a concave shape that is recessed downward from the upper surface 20a on the outer surface of the housing 20. The concave drainage groove 30 includes a side surface 30c on the outside of the board, a bottom surface 30d, and a side surface 30e on the inside of the board. The outer side surface 30c of the drainage groove 30 is formed so as to incline downward from the upper surface 20a on the outer side of the housing 20 toward the bottom surface 30d of the drainage groove 30. That is, the outer side surface 30c of the drainage groove 30 is configured as an inclined surface. The outer side surface 30c of the drainage groove 30 is configured to guide the liquid hung on the upper surface 20a on the outer side of the housing 20 toward the inside of the drainage groove 30 (bottom surface 30d of the drainage groove 30). Has been done. The bottom surface 30d of the drainage groove 30 is formed so as to extend along the horizontal direction (XY direction). The inner side surface 30e of the drainage groove 30 is formed so as to extend in the vertical direction. The upper end of the side surface 30e on the inside of the drainage groove 30 constitutes a part of the holding portion 21 of the housing 20.

Further, in the present embodiment, the depth L2 (for example, 5 mm) of the drainage groove 30 is larger than the vertical distance L1 between the upper surface 20a on the outer side of the board of the housing 20 and the end portion 25a of the seal member 25. big. The depth L2 of the drainage groove 30 is a vertical distance between the upper surface 20a on the outer side of the housing 20 and the bottom surface 30d of the drainage groove 30.

Next, the operation of the power conversion device 100 of the present embodiment will be described with reference to FIGS. 6 and 7. First, the inconvenience of the power conversion device 100a of the comparative example will be described with reference to FIG. Then, with reference to FIG. 7, the operation of the power conversion device 100 of the present embodiment will be described.

As shown in FIG. 6, the power conversion device 100a of the comparative example is different from the power conversion device 100 of the present embodiment in that the drainage groove 30 is not formed on the upper surface 20a of the housing 20.

In the power conversion device 100a of the comparative example, since the drainage groove 30 is not formed on the upper surface 20a of the housing 20, if the liquid continues to be applied to the upper surface 20a on the outer surface of the housing 20, the outer surface of the housing 20 will be covered. Liquid easily collects on the upper surface 20a. When the water level (liquid height position) WL of the liquid collected on the outer upper surface 20a of the housing 20 is higher than the height position of the end portion 25a of the sealing member 25, the liquid collected on the upper surface 20a is separated. It passes through the seam portion 24 (soaks in the seam portion 24), passes over the end portion 25a of the seal member 25 inside the panel, and invades the inside of the housing 20 (the space in which the power conversion circuit 10 is arranged). Therefore, in the power conversion device 100a of the comparative example, it is necessary to provide an additional sealing member at the end portion 25a of the sealing member 25 inside the panel. In FIG. 6, for ease of understanding, the intrusion route of the liquid from the seam portion 24 into the inside of the housing 20 is indicated by an arrow.

On the other hand, as shown in FIG. 7, in the power conversion device 100 of the present embodiment, when the liquid continues to be applied to the upper surface 20a on the outer surface of the housing 20, the liquid applied to the upper surface 20a on the outer surface of the housing 20 is. For example, it flows inside the drainage groove 30 (bottom surface 30d of the drainage groove 30) along the outer side surface 30c of the drainage groove 30. Then, it flows inside the drainage groove 30 in the Y1 direction and is discharged from the discharge end 30a to the side surface 20e of the housing 20, or flows inside the drainage groove 30 in the Y2 direction and is discharged from the discharge end 30b. It is discharged to the inside of the housing 20 via 20f. As a result, the liquid hung on the outer upper surface 20a of the housing 20 is smoothly discharged by the drainage groove 30, so that even if the liquid continues to hang on the upper surface 20a on the outer side of the housing 20, the housing 20 The liquid does not easily collect on the upper surface 20a on the outer side of the panel. Therefore, the water level WL of the liquid collected on the upper surface 20a is unlikely to be higher than the height position of the end portion 25a of the sealing member 25. Therefore, in the power conversion device 100 of the present embodiment, the drainage groove 30 overcomes the end portion 25a of the seal member 25 inside the panel and enters the inside of the housing 20 (the space where the power conversion circuit 10 is arranged). Invasion is suppressed.

(Effect of this embodiment)
In this embodiment, the following effects can be obtained.

In the present embodiment, as described above, the drainage groove 30 passing through the seam portion 24 is formed at the position corresponding to the wall portion 201 on the upper surface 20a of the housing 20. As a result, even if a liquid (water or the like) is splashed on the upper surface 20a of the housing 20, the splashed liquid can be smoothly discharged from the upper surface 20a of the housing 20 through the drainage groove 30. As a result, the drainage groove 30 suppresses the accumulation of the liquid on the upper surface 20a of the housing 20, and the liquid gets over the end portion 25a of the seal member 25 and is housed inside the housing 20 (the power conversion circuit 10 is housed). It is not necessary to provide an additional sealing member at the end portion 25a of the sealing member 25 inside the panel because it is possible to suppress the invasion into the space). As a result, it is possible to suppress the intrusion of liquid into the inside of the housing 20 while suppressing the increase in the number of sealing members and the increase in assembly man-hours due to the increase in the number of sealing members. Further, by forming the drainage groove 30, the liquid can be stored in the drainage groove 30. As a result, when the same amount of liquid is accumulated in the upper surface 20a of the housing 20, the upper surface 20a of the housing 20 (as a result) is larger than the case where the drainage groove 30 is not formed. The water level (the height position of the liquid) of the liquid accumulated in the drainage groove 30) can be lowered. As a result, it is possible to further prevent the liquid from passing over the end portion 25a of the seal member 25 and entering the inside of the housing 20, so that an additional seal member is provided at the end portion 25a of the seal member 25 inside the panel. Even if it is not present, the intrusion of the liquid into the housing 20 can be sufficiently suppressed.

Further, in the present embodiment, as described above, the drainage groove 30 is formed so as to extend in a direction intersecting the direction in which the seam portion 24 extends. As a result, the liquid discharged (guided) by the drainage groove 30 can flow in the direction away from the seam portion 24. As a result, while reducing the possibility that the liquid discharged by the drainage groove 30 invades the inside of the housing 20 from the seam portion 24, the liquid rides over the end portion 25a of the seal member 25 by the drainage groove 30 and the housing. It is possible to effectively suppress the invasion into the inside of the 20.

Further, in the present embodiment, as described above, the drain end 30a of the drainage groove 30 is connected to the side surface 20e of the housing 20. As a result, the liquid discharged by the drainage groove 30 can be smoothly discharged to the side surface 20e of the housing 20, so that the drainage property of the drainage groove 30 can be improved. As a result, even when the amount of liquid applied to the upper surface 20a of the housing 20 is large, the liquid is surely suppressed from accumulating on the upper surface 20a of the housing 20, and the liquid gets over the end portion 25a of the sealing member 25. It is possible to reliably suppress the intrusion into the inside of the housing 20.

Further, in the present embodiment, as described above, the drainage end 30a on one side of the drainage groove 30 is connected to the side surface 20e of the housing 20, and the drainage end 30b on the other side of the drainage groove 30 is connected to the housing. It is connected to the inside of the housing 20 via the opening 20f provided on the upper surface 20a of the 20. As a result, the liquid can be discharged at both ends of the drainage groove 30, so that the liquid discharged by the drainage groove 30 can be discharged more smoothly. Further, the drainage end 30b on the other side of the drainage groove 30 is placed inside the housing 20 (a space other than the space in which the power conversion circuit 10 is housed) via the opening 20f provided on the upper surface 20a of the housing 20. By connecting, it is not necessary to form the drainage groove 30 up to the side surface of the housing 20, so that the drainage groove 30 itself can be made smaller. As a result, even when the drainage groove 30 is provided, the manufacturability of the drainage groove 30 can be improved.

Further, in the present embodiment, as described above, the drainage groove 30 is formed in a linear shape. As a result, the drainage groove 30 can be formed in a simple shape, so that the manufacturability of the drainage groove 30 can be improved. Further, since the resistance when the liquid flows can be reduced as compared with the case where the corner portion (corner) or the curved portion is formed in the drainage groove 30, the drainage property of the drainage groove 30 is improved. be able to.

Further, in the present embodiment, as described above, the side surface 30c on the outer side of the drainage groove 30 is formed so as to be inclined downward from the upper surface 20a of the housing 20 toward the bottom surface 30d of the drainage groove 30. .. As a result, when the liquid is splashed on the upper surface 20a of the housing 20, the liquid on the upper surface 20a of the housing 20 is positively guided to the bottom surface 30d of the drainage groove 30 by the inclined side surface 30c of the drainage groove 30. be able to. As a result, it is possible to further suppress the accumulation of the liquid on the upper surface 20a of the housing 20, so that the liquid is further suppressed from passing over the end portion 25a of the sealing member 25 and entering the inside of the housing 20. be able to.

Further, in the present embodiment, as described above, the depth L2 of the drainage groove 30 is set to be longer than the vertical distance L1 between the upper surface 20a on the outer side of the board of the housing 20 and the end portion 25a of the seal member 25. Enlarge. As a result, even if the liquid is accumulated in the upper surface 20a of the housing 20 and the drainage groove 30, the water level of the accumulated liquid can be lowered. As a result, it is possible to further prevent the liquid from passing over the end portion 25a of the sealing member 25 and entering the inside of the housing 20.

[Modification example]
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the above embodiment, an example is shown in which the drainage groove is formed so as to extend in a direction intersecting the direction in which the seam extends, but the present invention is not limited to this. For example, the drainage groove may be formed so as to extend in the direction in which the seam extends.

Further, in the above embodiment, an example in which the drainage groove is formed in a linear shape is shown, but the present invention is not limited to this. For example, the drainage groove may be formed in a bent or curved shape so that the flow path is bent or curved.

Further, in the above embodiment, an example in which the drainage groove includes two drainage ends is shown, but the present invention is not limited to this. For example, the drainage groove may include one or more drainage ends.

Further, in the above embodiment, an example is shown in which the drainage end on one side of the drainage groove is connected to the side surface of the housing and the drainage end on the other side of the drainage groove is connected to the inside of the housing. However, the present invention is not limited to this. For example, both the drainage end on one side of the drainage groove and the drainage end on the other side of the drainage groove may be connected to the side surface of the housing. For example, in the modified example, as shown in FIG. 8, the drainage groove 130 extends in the Y direction from the side surface 20e of the housing 20 on one side in the Y direction to the side surface 20g of the housing 20 on the other side in the Y direction. It is formed like this. The drainage end 130a on one side of the drainage groove 130 and the drainage end 130b on the other side of the drainage groove 130 are connected to the side surface 20e of the housing 20 and the side surface 20g of the housing 20, respectively. Further, both the drainage end on one side of the drainage groove and the drainage end on the other side of the drainage groove may be connected to the inside of the housing.

Further, in the above embodiment, an example is shown in which the outer side surface of the drainage groove is formed so as to be inclined, but the present invention is not limited to this. For example, the outer side surface of the drainage groove may be formed so as to extend in the vertical direction.

Further, in the above embodiment, the depth of the drainage groove is larger than the vertical distance between the upper surface of the outer surface of the housing and the end portion of the seal member. Not limited. For example, the depth of the drainage groove may be smaller than the vertical distance between the upper surface of the outer surface of the housing and the end of the sealing member.

10 Power conversion circuit 20 Housing 20e Side 20f Opening 24 Seam 25 Sealing member 25a End 30, 130 Drainage groove 30a, 130a Drainage end 30b, 130b Drainage end 30c Side 30d Bottom surface 100 Power conversion device 201 Wall part 201a Opening Part L1 Vertical distance between the upper surface of the outer panel of the housing and the end of the sealing member L2 Depth of the drainage groove

Claims (7)

A housing that is arranged so as to partially expose the outside of the panel through an opening of a wall portion that separates the inside and the outside of the panel, has a divided structure, and houses a power conversion circuit.
A seal member provided at least along the seam portion on the upper surface of the housing, formed from the outside of the panel to the inside of the panel together with the seam portion, and having an end portion in the vicinity of the wall portion in the panel. Equipped with
A power conversion device in which a drainage groove passing through the seam is formed on the upper surface of the housing at a position corresponding to the wall portion. The power conversion device according to claim 1, wherein the drainage groove is formed so as to extend in a direction intersecting a direction in which the seam portion extends. The power conversion device according to claim 1 or 2, wherein the drain end of the drainage groove is connected to the side surface of the housing. The drainage end on one side of the drainage groove is connected to the side surface of the housing.
The power conversion device according to claim 3, wherein the drainage end on the other side of the drainage groove is connected to the inside of the housing through an opening provided on the upper surface of the housing. The power conversion device according to claim 3 or 4, wherein the drainage groove is formed in a linear shape. The aspect according to any one of claims 1 to 5, wherein the outer side surface of the drainage groove is formed so as to incline downward from the upper surface of the housing toward the bottom surface of the drainage groove. The power converter described. The power according to any one of claims 1 to 6, wherein the depth of the drainage groove is larger than the vertical distance between the upper surface of the outer surface of the panel of the housing and the end portion of the sealing member. Converter.

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