JP2021118228A - Capacitor case and capacitor - Google Patents

Abstract

To provide a capacitor case that can ensure the accuracy of mounting a capacitor to an external device using a mounting leg.SOLUTION: A capacitor case includes a case body 71, a mounting leg 72 provided on the outer surface of a wall portion 71a of the case body 71, and a rib 73 provided on the inner surface of the wall portion 71a and facing a base end portion 72b of the mounting leg 72 via the wall portion 71a, and the rib 73 straddles the inner surface of two wall portions 71a adjacent to each other, and the base end portion 72b of the mounting leg 72 and the rib 73 face each other at least half the length of the base end portion 72b of the mounting leg 72.SELECTED DRAWING: Figure 3

Description

The present invention relates to a capacitor case provided with mounting legs and a capacitor using the capacitor case.

A resin case may be used as a case for accommodating the capacitor element. Due to the characteristics of the material of the resin case, the wall surface may warp toward the inside of the case. Therefore, in Patent Document 1, ribs are provided in order to suppress warpage of the wall surface. Further, Patent Document 2 discloses that a rib-shaped positioning portion is provided inside the case.

Japanese Unexamined Patent Publication No. 2003-153415 JP-A-2002-376857

By the way, the wall surface of the case may be provided with mounting legs for fixing the case to an external device. The mounting legs project outward from the wall surface and are provided with, for example, through holes. Then, the case can be attached to the external device by inserting a fixing tool such as a bolt across the through hole and the hole provided in the external device.

However, if the wall surface is warped, the orientation and position of the mounting legs will shift, resulting in poor mounting accuracy and inability to mount in the first place. If the ribs are provided, the warpage of the wall surface can be suppressed as compared with the case where the ribs are not provided, but the displacement of the mounting legs may not be sufficiently suppressed depending on the positional relationship between the mounting legs and the ribs. ..

Therefore, an object of the present invention is to provide a capacitor case and a capacitor capable of ensuring the mounting accuracy of the capacitor to an external device by the mounting legs.

The capacitor case 7 of the present invention is provided on the case main body 71, the mounting legs 72 provided on the outer surface of the wall portion 71a of the case main body 71, and the mounting legs 72 provided on the inner surface of the wall portion 71a, and the mounting legs 72 are provided via the wall portion 71a. The base end portion 72b and the rib 73 facing each other are provided, and the rib 73 straddles the inner surface of two wall portions 71a adjacent to each other, and is more than half of the length (L1, L3) of the base end portion 72b of the mounting leg 72. The base end portion 72b of the mounting leg 72 and the rib 73 are opposed to each other.

In the capacitor case 7, the rib 73 is provided substantially parallel to the longitudinal direction of the base end portion 72b of the mounting leg 72, and the mounting leg has a length L1 of half or more of the length L1 of the base end portion 72b of the mounting leg 72 in the longitudinal direction. It is preferable that the base end portion 72b of 72 and the rib 73 face each other.

Further, the capacitor of the present invention is characterized in that the capacitor element 2 is housed in the capacitor case 7 and filled with resin.

Since the capacitor case of the present invention is provided with ribs facing the base end portion of the mounting leg via the wall portion, it is possible to effectively suppress the warp of the wall portion of the portion where the mounting leg is provided. .. In particular, since the base end of the mounting leg and the rib face each other for more than half the length of the base end of the mounting leg, the displacement of the mounting leg due to warpage is suppressed, and the capacitor is attached to the external device by the mounting leg. Accuracy can be ensured.

The ribs are provided substantially parallel to the longitudinal direction of the base end of the mounting leg, and the base end of the mounting leg and the rib face each other for more than half of the length of the base end of the mounting leg in the longitudinal direction. In this case, it is possible to secure a sufficient length so that the base end of the mounting leg and the rib face each other, further suppress the displacement of the mounting leg due to warpage, and further secure the mounting accuracy of the capacitor to the external device by the mounting leg. be able to.

It is an exploded perspective view which shows the capacitor which concerns on one Embodiment of this invention. It is a perspective view of a capacitor. It is sectional drawing of the capacitor case. It is a top view of a capacitor case. FIG. 5a is a cross-sectional view showing a capacitor case according to another embodiment, and FIG. 5b is a plan view of the capacitor case. It is sectional drawing which shows the capacitor case which concerns on another embodiment. It is sectional drawing which shows the capacitor case which concerns on still another Embodiment.

Next, an embodiment of the capacitor 1 of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the capacitor 1 of the present invention includes a plurality of capacitor elements 2, a bus bar 3 (see FIG. 2) connected to the capacitor element 2, a capacitor case 7 accommodating the capacitor element 2, and a capacitor case. It includes a resin (not shown) filled in 7. Hereinafter, each of the above parts will be described, but the concept of "upper and lower" in the description is at the time of manufacturing, more specifically at the time of resin filling, and does not necessarily define the upper and lower parts at the time of use. ..

The capacitor element 2 is a film capacitor obtained by winding a metallized film on which metal is vapor-deposited on the surface of an insulating film, and electrode portions 2a and 2b formed by spraying metal on both end surfaces in the axial direction are respectively. It is formed. The capacitor element 2 has a bale shape when viewed from the axial direction, specifically, R (R) is provided at four corner portions, and has a flat portion 2c and a curved surface portion 2d on the outer periphery in the axial direction. ..

Four capacitor elements 2 having the above configuration are arranged side by side with the electrode portions 2a and 2b facing up and down to form a capacitor element group 21. The number of capacitor elements 2 in the capacitor element group 21 can be appropriately changed according to the required capacitance.

The bus bar 3 includes a first bus bar 4 connected to the upper electrode portion 2a of the capacitor element 2 and a second bus bar 5 connected to the lower electrode portion 2b.

The first bus bar 4 includes a base 41, an external connecting portion 42 extending from the base 41, and an element connecting portion 43 extending from the base 41. The planar shape of the base 41 is substantially L-shaped. The size of the base 41 is determined so that at least a part of the base 41 overlaps with all the electrode portions 2a of the four capacitor elements 2 constituting the capacitor element group 21. The external connection portion 42 extends upward from one side of the base portion 41. The external connection portion 42 is provided with a connection hole 42a for connecting to an external device. The element connection portion 43 has a tongue shape and extends from the outer periphery of the base portion 41.

The second bus bar 5 also includes a base 51, an external connecting portion 52 extending from the base 51, and an element connecting portion 53 extending from the base 51. The base 51 of the second bus bar 5 has a substantially U-shaped side view so that the capacitor element 2 and the first bus bar 4 can be arranged between them, and the upper horizontal portion 51a and the upper horizontal portion 51a It is roughly divided into a vertical portion 51b extending downward from the long side and a lower horizontal portion 51c extending horizontally from the lower end of the vertical portion 51b. The external connection portion 52 extends upward from the side of the upper horizontal portion 51a opposite to the vertical portion 51b. The external connection portion 52 is provided with a connection hole 52a for connecting to an external device. The element connecting portion 53 has a tongue shape and extends from one side of the lower horizontal portion 51c.

The first bus bar 4 and the second bus bar 5 are formed by appropriately punching or bending a metal plate such as aluminum or copper.

By the way, a part of the first bus bar 4 and the second bus bar 5 overlap each other as shown in FIG. Specifically, the base 41 of the first bus bar 4 and the upper horizontal portion 51a of the second bus bar 5 overlap each other so that the second bus bar 5 faces up. An insulating member 6 is interposed between the base 41 of the first bus bar 4 and the upper horizontal portion 51a of the second bus bar 5.

The insulating member 6 is larger than the upper horizontal portion 51a of the second bus bar 5, and protrudes from the periphery of the upper horizontal portion 51a of the second bus bar 5 in a plan view. Further, the insulating member 6 has a substantially L-shape in side view and covers a part of the vertical portion 51b of the second bus bar 5. As a result, the insulation between the second bus bar 5 and the upper electrode portion 2a of the capacitor element 2 and the insulation between the second bus bar 5 and the first bus bar 4 are secured. The insulating member 6 is made of, for example, insulating paper. However, it is also possible to provide a space in which the insulation distance can be secured without providing the insulating member 6.

The capacitor case 7 is made of synthetic resin, and the case body 71, the mounting legs 72, and the ribs 73 are integrally molded.

The case body 71 includes five wall portions 71a. Specifically, it includes a bottom wall portion 71a1 having a substantially rectangular shape in a plan view, and a side wall portion 71a2 that rises upward from each of the four sides of the bottom wall portion 71a1. The upper end of the case body 71 (the surface facing the bottom wall portion 71a1) is open, and a storage space capable of accommodating the capacitor element 2 and the bus bar 3 is formed inside.

The mounting legs 72 are provided on the bottom wall portion 71a1 and the two side wall portions 71a2 rising from the short side of the bottom wall portion 71a1, respectively. The mounting legs 72 of the bottom wall portion 71a1 project downward from the outer surface of the bottom wall portion 71a1. Further, the mounting legs 72 of the side wall portion 71a2 project in the horizontal direction from the outer surface of the side wall portion 71a2. These mounting legs 72 are for mounting the capacitor case 7 to an external device (not shown), and are provided with mounting holes 72a. Assuming that the portion of the mounting leg 72 on the wall portion 71a (bottom wall portion 71a1, side wall portion 71a2) side is the base end portion 72b, the shape of the base end portion 72b is substantially rectangular in the plane parallel to the wall portion 71a. .. As shown in FIGS. 3 and 4, the mounting legs 72 of the side wall portion 71a2 are oriented in the longitudinal direction of the base end portion 72b in the vertical direction and in the lateral direction in the lateral direction. The mounting hole 72a is open in the horizontal direction. That is, it can be said that the mounting hole 72a and the opening 71b of the case body 71 are opened in a direction substantially orthogonal to each other. Reference numeral 72c is a reinforcing plate provided in parallel with the opening direction of the mounting hole 72a, and increases the rigidity in the same direction as the opening direction of the mounting hole 72a.

The rib 73 has a plate shape having a thickness of, for example, about 3 mm and a height (protruding length from the wall portion 71a) of, for example, about 10 mm, and the rib 73 and the base end portion 72b of the mounting leg 72 via the wall portion 71a. It is provided on the inner surface of the wall portion 71a so as to face each other. That is, as shown in FIG. 4, the rib 73 is located within the width W1 (excluding the reinforcing plate) in the lateral direction of the base end portion 72b of the mounting leg 72 in a plan view. The rib 73 straddles two surfaces, a bottom wall portion 71a1 and a side wall portion 71a2, which are adjacent to each other. In this state, it can be said that the rib 73 extends upward (mounting leg 72) from the bottom wall portion 71a1 along the side wall portion 71a2. The rib 73 and the base end portion 72b of the mounting leg 72 face each other by more than half the length of the base end portion 72b of the mounting leg 72. More specifically, the extending direction of the rib 73 and the longitudinal direction of the base end portion 72b of the mounting leg 72 are substantially parallel, and the rib 73 and the base end portion 72b of the mounting leg 72 are formed by the mounting leg 72. The base end portions 72b of the above face each other by more than half of the length in the longitudinal direction. Therefore, assuming that the length of the base end portion 72b of the mounting leg 72 in the longitudinal direction is L1 and the overlapping length of the rib 73 and the base end portion 72b of the mounting leg 72 is L2, the following equation is established.

L1 / 2 ≤ L2

By causing the ribs 73 and the mounting legs 72 to face each other in this way, it is possible to effectively suppress the warp of the wall portion 71a of the portion where the mounting legs 72 are provided. As a result of suppressing the deviation of the orientation and position of the mounting legs 72 due to the warping of the wall portion 71a, the capacitor case 7 can be accurately mounted on the external device by the mounting legs 72. Further, since the mounting legs 72 and the wall portion 71a are reinforced by the ribs 73, stable mounting is achieved even when a large stress is applied to the mounting legs 72 and the wall portion 71a due to severe vibration conditions.

By the way, as shown in FIG. 3, the upper corner portion of the rib 73 is notched diagonally. Specifically, it is cut in a triangular shape from the contact point with the side wall portion 71a2 toward the bottom wall portion 71a1. This is to prevent the upper corners from damaging the contained objects such as the capacitor element 2 and the bus bar 3 housed in the case body 71. Further, as shown in FIG. 4, the rib 73 is arranged in the dead space D generated in the case main body 71. The dead space D is, for example, between the curved surface portions 2d and 2d of the capacitor element 2, between the capacitor element 2 and the side wall portion 71a2, between the capacitor element 2 and another electronic component (not shown), and between the electronic component and the side wall portion. It is between 71a2 and so on. In this embodiment, the rib 73 is located between the curved surface portions 2d and 2d of the capacitor element 2. By locating the rib 73 in the dead space D in this way, it is possible to contribute to the miniaturization of the entire capacitor.

The thickness of the rib 73 may be larger than the thickness of the mounting leg 72 (length in the lateral direction). However, if the thickness is large, the wall portion 71a may be sinked. Therefore, for example, it is preferable to keep the thickness at the same level as the wall portion 71a of the case body.

The resin filled in the case body 71 is, for example, an epoxy resin. However, the present invention is not limited to this, and various known resins such as urethane resin can be used.

Next, a method of manufacturing the capacitor 1 will be described. First, the base 41 of the first bus bar 4 is superposed on the upper electrode portion 2a of the capacitor element 2, and the upper electrode portion 2a of the capacitor element 2 and the first bus bar 4 are electrically connected. Next, the insulating member 6 is superposed on the base 41 of the first bus bar 4. Then, the capacitor element 2, the first bus bar 4, and the insulating member 6 are inserted into the substantially U-shaped second bus bar 5, and the electrode portion 2b and the second bus bar 5 on the lower side of the capacitor element 2 are formed. Electrically connect. The capacitor element 2, the bus bar 3, and the insulating member 6 integrated in this way are housed in the case body 71 so that the external connection portions 42 and 52 project upward from the opening 71b of the case body 71. , The production of the capacitor 1 is completed by filling the case body 71 with resin.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, the extending direction of the rib 73 and the longitudinal direction of the base end portion 72b of the mounting leg 72 need not be substantially parallel, and as shown in FIGS. 5a and 5b, for example, the extending direction of the rib 73 and the mounting The longitudinal direction of the base end portion 72b of the leg 72 may be substantially orthogonal to the longitudinal direction. Even in this case, the rib 73 is located within the longitudinal width W2 of the base end portion 72b of the mounting leg 72, and the rib 73 and the base end portion 72b of the mounting leg 72 are the base end of the mounting leg 72. If the portions 72b face each other by more than half of the length in the lateral direction, that is, the length of the base end portion 72b of the mounting leg 72 in the lateral direction is L3, the rib 73 and the base end portion 72b of the mounting leg 72. If L3 / 2 ≦ L2 is established when the overlapping length of the above is L2, the same effect as that of the above embodiment can be obtained.

Further, as shown in FIG. 6, the mounting legs 72 provided on the bottom wall portion 71a1 and the ribs 73 may face each other. Further, as shown in FIG. 7, mounting legs 72 are provided on two adjacent wall surfaces (bottom wall portion 71a1 and side wall portion 71a2), respectively, and 1 so as to straddle the base end portions 72b of the mounting legs 72. One rib 73 may be provided. Further, the positions where the mounting legs 72 and the ribs 73 are provided do not have to be near the center of the wall portion 71a in the horizontal direction, and may be provided at a position shifted to the left or right or at the end of the case body 71. Further, the rib 73 may straddle the bottom wall portion 71a1 and the side wall portion 71a2, or may straddle the side wall portion 71a1 and the side wall portion 71a1. In short, regardless of whether it is the bottom wall portion 71a1 or the side wall portion 71a2, the rib 73 may be provided so as to straddle the inner surfaces of the two wall portions 71a adjacent to each other.

Further, although four capacitor elements 2 are used, the number is not limited to this, and the number may be appropriately changed. Further, the capacitor element 2 is not limited to a film capacitor, and various capacitor elements such as a ceramic capacitor may be used, or a plurality of types of capacitor elements may be combined. As for the shape of the capacitor element, various shapes such as a columnar shape and a prismatic shape can be adopted.

1 Capacitor 2 Capacitor element 2a One (upper) electrode part 2b The other (lower) electrode part 2c Flat part 2d Curved part 21 Capacitor element group 3 Bus bar 4 First bus bar 41 Base 42 External connection 42a Connection hole 43 Element connection Part 5 Second bus bar 51 Base 51a Upper horizontal 51b Vertical 51c Lower horizontal 52 External connection 52a Connection hole 53 Element connection 6 Insulation member 7 Capacitor case 71 Case body 71a Wall 71a1 Bottom wall 71a2 Side wall 71b Opening 72 Mounting leg 72a Mounting hole 72b Base end 72c Reinforcing plate 73 Rib L1 Length of the base end of the mounting leg in the longitudinal direction L2 Length of the part where the base end of the mounting leg and the rib overlap L3 Length of the base end in the lateral direction W1 Width of the base end of the mounting leg in the lateral direction W2 Width of the base end of the mounting leg in the longitudinal direction D Dead space

Claims (3)

The case body, the mounting legs provided on the outer surface of the wall portion of the case body, and the ribs provided on the inner surface of the wall portion and facing the base end portion of the mounting legs via the wall portion are provided.
The ribs straddle the inner surfaces of the two walls that are adjacent to each other.
A condenser case in which the base end of the mounting leg and the rib face each other for more than half the length of the base end of the mounting leg. The ribs are provided substantially parallel to the longitudinal direction of the base end of the mounting legs.
The condenser case according to claim 1, wherein the base end portion of the mounting leg and the rib are opposed to each other by half or more of the length in the longitudinal direction of the base end portion of the mounting leg. A capacitor in which a capacitor element is housed in the capacitor case according to claim 1 or 2 and filled with resin.

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