JP7000970B2 - Case for power converter - Google Patents

Description

The present invention relates to a case for a power converter.

Conventionally, a cover that covers an opening of a case body of a power conversion device case is provided with a hanging seat for hanging with a hanger during painting or transportation. For example, in the cleaning liquid circulation device for electrodeposition coating of Patent Document 1, a configuration is disclosed in which such a suspension seat is provided on the peripheral edge of a cover and electrodeposition coating is performed with the cover suspended. Then, in the power conversion device provided with such a cover, the cover is provided by providing a protrusion at a position facing the inner side surface of the cover of the side wall of the case body so that the protrusion can be brought into contact with the inner side surface of the cover. The cover is restricted from rotating when it is fastened and fixed with screws to prevent misalignment.

Japanese Unexamined Patent Publication No. 2010-247011

In the configuration disclosed in Patent Document 1, in order to reduce the size of the case and the manufacturing cost, a protrusion provided on the side wall of the case body is provided at a position facing the inner side surface of the suspension seat provided on the cover. It is conceivable that the suspension seat can be used to regulate the rotation of the cover by allowing the protrusion to come into contact with the inner surface of the suspension seat. However, when the cover is suspended by the suspension seat, the suspension seat may be deformed due to the weight of the cover itself. When the suspension seat is deformed, the gap between the protrusion of the case body and the inner surface of the suspension seat of the cover widens, and the dimensional accuracy required for restricting the rotation of the cover is not maintained. As a result, when the cover is fastened and fixed to the case body with the screw member, the cover is excessively rotated and the position is likely to be displaced.

The present invention has been made in view of this background, and is for a power conversion device capable of preventing the occurrence of misalignment of the cover when fastening and fixing the cover provided with the suspension seat, and reducing the size and manufacturing cost. It is intended to provide a case.

One aspect of the present invention includes a case body (10) having an opening (10a) for accommodating an electronic component (30) for power conversion, and a cover (20) covering the opening. A power conversion device case (1) in which the case body and the cover are fastened and fixed to each other by a screw member (40).
On the cover, a suspension seat (50) for suspending the cover is formed so as to project outward.
The case body is formed so as to project from the case body, and is located on the front side of the screw member in the rotational direction when fastening and fixing, and is located on the suspension seat when fastening and fixing. It is in a case for a power conversion device provided with a rotation regulating unit (60) configured to be in contact with the cover and to regulate the relative rotation between the cover and the case body.

In the case for the power conversion device, the rotation restricting portion protruding from the case body is located on the front side in the rotation direction of the screw member with respect to the suspension seat protruding from the cover. Therefore, when the cover is fastened and fixed to the case body, the suspension seat comes into contact with the rotation restricting portion, so that the relative rotation between the cover and the case body is restricted. When the cover is suspended by the suspension seat and the suspension seat is deformed by its own weight, the suspension seat is deformed so as to extend in the protruding direction of the suspension seat. Therefore, even if such deformation occurs, the size of the gap between the suspension seat and the rotation restricting portion in the rotation direction of the screw member does not substantially change, so that it is necessary to regulate the relative rotation of the cover. Dimensional accuracy can be maintained. As a result, when the cover and the case main body are fastened and fixed, the rotation regulation unit reliably regulates the rotation and prevents the cover from being displaced. Furthermore, by making the rotation control part abuttable to the suspension seat, the suspension seat is used for rotation regulation when the cover is fastened and fixed, so that the rotation control part covers the part that can be contacted separately from the suspension seat. There is no need to install it in. As a result, the configuration can be simplified, the case for the power conversion device can be miniaturized, and the manufacturing cost can be reduced.

As described above, according to the present invention, there is provided a case for a power conversion device that can prevent the occurrence of misalignment of the cover when fastening and fixing the cover provided with the suspension seat, and can reduce the size and manufacturing cost. be able to.

The reference numerals in parentheses described in the scope of claims and the means for solving the problem indicate the correspondence with the specific means described in the embodiments described later, and limit the technical scope of the present invention. It's not a thing.

The perspective view of the power conversion apparatus in Embodiment 1. FIG. The perspective view of the power conversion apparatus with the cover removed in Embodiment 1. FIG. The top view of the power conversion apparatus in Embodiment 1. The perspective view which showed the suspended state of the cover in Embodiment 1. FIG. FIG. 3 is a sectional view taken along line V-V. FIG. 3 is a sectional view taken along line VI-VI. Top view of the power conversion device in the first modification. The perspective view of the power conversion apparatus in Embodiment 2. The top view of the power conversion apparatus in Embodiment 2. Top view of the power conversion device in the modified form 2.

(Embodiment 1)
An embodiment of the power conversion device will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, the power conversion device case 1 of the present embodiment includes a case body 10 and a cover 20.
The case body 10 has an opening 10a. An electronic component 30 that performs power conversion is housed in the case body 10.
The cover 20 covers the opening 10a.
The case body 10 and the cover 20 are fastened and fixed to each other by a screw member 40.
As shown in FIGS. 1 and 2, the cover 20 is formed with a suspension seat 50 for suspending the cover 20 so as to project outward.
A rotation restricting portion 60 is formed so as to project from the case body 10.
The rotation restricting portion 60 is located on the front side of the screw member 40 in the rotation direction R when fastening and fixing the suspension seat 50, and abuts on the suspension seat 50 when fastening and fixing, and the cover 20 and the case body 10 are brought into contact with each other. It is configured so that the relative rotation can be regulated.

Hereinafter, the case 1 for the power conversion device of the present embodiment will be described in detail.
As shown in FIGS. 1 and 2, the case body 10 of the power conversion device case 1 has a rectangular bottom plate 11, side walls 12 and 13 on the short side erected on the two short sides of the bottom plate 11, and a bottom plate. It is provided with side walls 14 and 15 on the long side erected on the two long sides of 11. The opposite side of the bottom plate 11 is an opening 10a. The electronic component 30 constituting the power conversion circuit is housed inside the case body 10. The longitudinal direction of the power conversion device case 1 is Y, the lateral direction is X, and the high direction is Z.

As shown in FIG. 2, a rotation restricting portion 60 is provided on the side wall 14 on the long side of the case body 10. The rotation restricting portion 60 projects outward from the side wall 14 on the long side in parallel with the lateral direction X. Further, on the side wall 14 on the long side, a guide protrusion 70 is formed so as to project outward in parallel with the lateral direction X at a position separated from the rotation restricting portion 60 by a predetermined distance in the longitudinal direction Y.

As shown in FIG. 1, a cover 20 is attached to the opening 10a of the case body 10 shown in FIG. As shown in FIGS. 3 and 4, the cover 20 has a rectangular plate shape in a plan view. As shown in FIG. 5, when the cover 20 is attached to the case body 10, the sealing surface 24, which is the lower surface of the peripheral edge portion 23 of the cover 20, is in contact with the upper end of the side wall 14 of the case body 10 to maintain the sealing property. Has been done. Although not shown, the upper ends of the other side walls 12, 13 and 15 of the case body 10 are similarly in contact with the sealing surface 24 to maintain the sealing property.

As shown in FIG. 4, a suspension seat 50 is formed so as to project on the long side 21 of the cover 20. A through hole 51 is formed in the suspension seat 50. When painting or transporting the cover 20, the cover 20 can be suspended by inserting a hook 101 or the like on the equipment side into the through hole 51.

As shown in FIG. 5, the suspension seat 50 has a first bent portion 53 and a second bent portion 54. The first bent portion 53 is bent in a direction different from the protruding direction P of the suspension seat 50. The second bent portion 54 is located between the first bent portion 53 and the tip end portion 52 of the suspension seat 50 in the protruding direction P, and is bent in the direction opposite to the first bent portion 53. In the present embodiment, the first bent portion 53 is bent 90 degrees in the counterclockwise direction F1 on the paper surface in FIG. 5 in a direction orthogonal to the protruding direction P, and the second bent portion 54 is bent. It is bent 90 degrees in the clockwise direction F2 on the paper in FIG. As a result, the portion from the second bent portion 54 to the tip portion 52 is parallel to the protruding direction P, and the through hole 51 is provided in the portion. Then, as shown in FIG. 5, the respective bending axes of the first bent portion 53 and the second bent portion 54 are parallel to each other, and as shown in FIG. 4, the first bent portion 53 and the second bent portion 53 and the second are bent. The corner portions 53a and 54a formed by bending the bent portion 54 of the above are parallel to each other.

As shown in FIG. 5, a gap 55 is formed between the second bent portion 54 of the suspension seat 50 and the case body 10. The size W of the gap 55 is not limited, but can be, for example, 1.0 to 5.0 mm. Further, the protruding direction P of the suspension seat 50 is parallel to the protruding direction of the rotation restricting portion 60, that is, the lateral direction X. The length L1 in the protruding direction P of the suspension seat 50 and the length L2 in the protruding direction P of the rotation restricting portion 60 are substantially the same as each other. The length L1 of the protruding direction P of the suspension seat 50 and the length L2 of the protruding direction P of the rotation restricting portion 60 are not limited, but are preferably having a certain size in order to reliably perform the rotation regulation described later. It is preferable not to make it excessively large in order to suppress the deterioration of the mountability of the power converter. From this point of view, the length L1 in the protruding direction P of the suspension seat 50 and the length L2 in the protruding direction P of the rotation restricting portion 60 can be set to, for example, 5.0 to 20.0 mm. In consideration of the case where the suspension seat 50 is deformed so as to extend in the protrusion direction P when the cover 20 is suspended via the suspension seat 50, the length L2 of the rotation restricting portion 60 in the protrusion direction P is set to the suspension seat. It may be larger than the length L1 of the protrusion direction P of 50.

As shown in FIG. 6, since the distance D1 between the rotation restricting portion 60 and the guide protrusion 70 in the longitudinal direction Y is slightly larger than the width D2 of the suspension seat 50, the suspension seat 50 is the rotation restricting portion 60. With a gap 57 having a width D3 formed between the two, the rotation restricting portion 60 and the guide protrusion 70 can be positioned between the two. Then, in a state where the cover 20 is attached to the case body 10, the suspension seat 50 is located between the rotation restricting portion 60 and the guide protrusion 70, and the rotation regulating portion 60 fastens the cover 20 rather than the suspension seat 50. It is located on the front side of the rotation direction R of the screw member 40 for fixing. As a result, as shown in FIG. 3, when the cover 20 rotates with the screw member 40 and tries to rotate relatively in the rotation direction R when the cover 20 is fastened and fixed, the rotation restricting portion 60 and the rotation restricting portion 60 shown in FIG. The facing surfaces 61 and 56 of the suspension seat 50 come into contact with each other, and the relative rotation of the cover 20 and the case body 10 is restricted.

As shown in FIG. 6, the upper surface 60a of the rotation restricting portion 60 and the upper surface 70a of the guide protrusion 70 are inclined so as to be located in the lower Z1 as they approach each other. Thereby, when the cover 20 is attached to the case main body 10, the suspension seat 50 can be guided between the rotation restricting portion 60 and the guide protrusion portion 70. The height H1 of the rotation restricting portion 60 and the height H2 of the guide protrusion 70 are both larger than the thickness H3 of the suspension seat 50. As a result, the suspension seat 50 can be reliably arranged between the rotation restricting portion 60 and the guide protrusion 70.

Next, the operation and effect of the power conversion device case 1 of the present embodiment will be described in detail.
In the case 1 for the power conversion device, the rotation restricting portion 60 projecting from the case body 10 is located on the front side in the rotation direction R of the screw member 40 with respect to the suspension seat 50 projecting from the cover 20. Therefore, when the cover 20 is fastened and fixed to the case body 10, the suspension seat 50 comes into contact with the rotation restricting portion 60, so that the relative rotation between the cover 20 and the case body 10 is restricted. When the cover 20 is suspended by the suspension seat 50 and the suspension seat 50 is deformed by its own weight, the suspension seat 50 is deformed so as to extend in the protruding direction P of the suspension seat 50. Therefore, even if such deformation occurs, the size of the gap 57 between the suspension seat 50 and the rotation restricting portion 60 in the rotation direction R of the screw member 40 does not substantially change, so that the relative rotation of the cover 20 is restricted. The dimensional accuracy required to do so can be maintained. As a result, when the cover 20 and the case main body 10 are fastened and fixed, the rotation regulation unit 60 reliably regulates the rotation and prevents the cover 20 from being displaced. Further, since the rotation restricting portion 60 can be brought into contact with the suspension seat 50, the suspension seat 50 is used for the rotation regulation when the cover 20 is fastened and fixed. It is not necessary to provide a contactable portion on the cover 20. As a result, the configuration can be simplified, the case 1 for the power conversion device can be miniaturized, and the manufacturing cost can be reduced.

In the present embodiment, the suspension seat 50 has a first bent portion 53 that is bent in a direction different from the protrusion direction P of the suspension seat 50, and a tip portion of the first bent portion 53 and the suspension seat 50 in the protrusion direction P. It has a second bent portion 54 which is located between the 52 and is bent in the direction opposite to that of the first bent portion 53. As a result, the strength of the suspension seat 50 is improved, and when the cover 20 is suspended by the suspension seat 50, the suspension seat 50 is in the protruding direction P at the first bent portion 53 and the second bent portion 54. Since the cover 20 is easily deformed, the sealing surface 24 of the cover 20 is prevented from being deformed, and the sealing property between the cover 20 and the case body 10 is improved.

In the present embodiment, a gap 55 is formed between the second bent portion 54 and the case body 10. As a result, when the cover 20 is removed from the case body 10, the cover 20 can be easily separated from the case body 10 by inserting a tool into the gap 55 after removing all the screw members 40. It can be expected to improve work efficiency when removing.

In addition, as in the modified form 1 shown in FIG. 7, the configuration may not have the guide protrusion 70. Also in this case, the same effect as that of the first embodiment is obtained except for the effect of the guide protrusion 70.

As described above, according to the present embodiment, for a power conversion device capable of preventing the occurrence of misalignment of the cover 20 when fastening and fixing the cover 20 provided with the suspension seat 50, as well as reducing the size and manufacturing cost. Case 1 can be provided.

(Embodiment 2)
As shown in FIGS. 8 and 9, the power conversion device case 1 of the present embodiment is provided with a connector connection portion 26 to which a connector (not shown) is connected. The connector connection portion 26 is located on one short side. The connector connection portion 26 has a fixed positional relationship with the cover 20 in order to ensure sealing performance. Therefore, when the cover 20 is fastened and fixed by the screw member 40, the cover 20 tries to rotate in the rotation direction R at the time of fastening the screw member 40 with the center C of the connector connecting portion 26 as the rotation center.

As shown in FIGS. 8 and 9, the cover 20 and the case body 10 each have a rectangular shape in a plan view, the suspension seat 50 is provided on the short side 27 of the cover 20, and the rotation restricting portion 60 is provided. It is provided on the side wall 12 on the short side of the case body 10. As a result, the suspension seat 50 and the rotation restricting portion 60 are located distal to the center C of the connector connecting portion 26 which is the center of rotation, so that the rotation angle of the cover 20 at the time of fastening and fixing can be reduced, so that the cover 20 can be reduced. Positional deviation can be further suppressed. Further, by locating the suspension seat 50 and the rotation restricting portion 60 on the short side side, the mountability can be improved. It should be noted that this embodiment also has the same effect as that of the first embodiment.

In addition, as in the modified form 2 shown in FIG. 10, the configuration may not have the guide protrusion 70. Also in this case, the same effect as that of the second embodiment is obtained except for the effect of the guide protrusion 70.

The present invention is not limited to each of the above embodiments, and can be applied to various embodiments without departing from the gist thereof.

1 Case for power converter 10 Case body 10a Opening 20 Cover 30 Electronic parts 40 Screw member 50 Suspended seat 53 First bent part 54 Second bent part 55 Gap 60 Rotation control part 70 Guide protrusion

Claims (4)

A case body (10) having an opening (10a) for accommodating an electronic component (30) for power conversion, and a cover (20) covering the opening are provided, and the case body and the cover are provided. Is a case (1) for a power conversion device, which is fastened and fixed to each other by a screw member (40).
On the cover, a suspension seat (50) for suspending the cover is formed so as to project outward.
The case body is formed so as to project from the case body, and is located on the front side of the screw member in the rotational direction when fastening and fixing, and is located on the suspension seat when fastening and fixing. A case for a power conversion device provided with a rotation control unit (60) configured to be in contact with the cover and to regulate the relative rotation of the case body. The suspension seat has a first bent portion (53) that is bent in a direction different from the protrusion direction of the suspension seat, and a tip portion (52) of the first bent portion and the suspension seat in a protrusion direction. The case for a power conversion device according to claim 1, further comprising a second bent portion (54) located between the bent portions and bent in a direction opposite to that of the first bent portion. The case for a power conversion device according to claim 2, wherein a gap (55) is formed between the second bent portion and the case body. The cover and the case body each have a rectangular shape in a plan view, the suspension seat is provided on the short side (27) of the cover, and the rotation restricting portion is a side wall on the short side side of the case body. The case for a power conversion device according to any one of claims 1 to 3, provided in (12).

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