JPH01262613A - Case for capacitor - Google Patents

Abstract

PURPOSE:To keep a rivet from rotating to avoid a burnout of a lead, by providing rivets which have protrusions on the back of the flange and pass through a lid, terminals connected to the tops of the rivets and an insulating plate which has holes for the protrusions to be inserted into and is fixed on the lid. CONSTITUTION:On an insulating plate 8 of about 0.5mm thickness, four or more recessed portions 9 are established in the depth of about 1mm and in the width of about 1mm. Into the recessed portions 9, protrusions 6 of rivets 4 are inserted. Between rivet through holes 11 made on the insulating plate 8, a partition wall 10 is set up to gain a creeping by arc discharge. Bushings 13 through which rivets pass are in contact with rubber packings 12, insulating terminals 7 from a lid 3. By virtue of this structure, the rivets are kept from rotating by an existence of the protrusions 6 of the rivets and the recessed portions 9 of the insulating plate, resulting in prevention of a burnout of a lead.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a case for a capacitor.

(Prior art) MP capacitors, for example, have a 41 structure in which the capacitor element is housed in a metal case and sealed (problem to be solved by the invention) However, with the conventional lid, rotational force is applied to the terminals. This has the disadvantage that it easily rotates together with the rivet, causing the lead wire connected to the rivet to twist and break.

SUMMARY OF THE INVENTION An object of the present invention is to provide a capacitor case that can improve the above-mentioned drawbacks, prevent rotation of terminals, and prevent disconnection of lead wires.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a capacitor case that has a built-in capacitor element and can be sealed, which has a protrusion inside the flange and penetrates through the lid. rivet, a terminal connected to the tip of the rivet, and an insulating plate having four parts or holes into which the protrusion of the flange is inserted, through which the rivet passes and is fixed to the plate. The present invention provides a case for a capacitor.

Further, the present invention provides a capacitor case according to claim 1, characterized in that the capacitor case has an insulating plate having partition walls between the holes through which the rivets pass.

(Function) The rivet of the present invention is provided with projections on the inside of the flange, and the insulating plate is provided with four parts or holes, and the projections of the flange are inserted into these four parts or holes. The insulating plate is fixed via a rubber backing etc.,
Therefore, rotation of the rivet and terminal can be prevented.

(Example) Hereinafter, the present invention will be explained based on illustrated embodiments.

In FIG. 1, reference numeral 1 denotes a capacitor case consisting of a metal case body 2 and a lid 3. As shown in FIG. 4 is a rivet that penetrates M3 as shown in FIG. 2, and is a protrusion having a height and width of approximately 0.1 to 0.8 mm inside the collar portion 5, and is provided at two or more locations. 7 is a terminal connected to the tip of the rivet 4. 8 is made of plastic as shown in Figure 3.
It is an insulating plate with a thickness of about 0.3 to 0.5 mm. Reference numeral 9 designates recesses provided in the insulating plate 8, each having a depth and a width of approximately 0.2 to 1.0 am, four or more recesses are provided, and the protrusions 6 of the rivet 4 are inserted into some of the recesses. Reference numeral 10 denotes a partition wall having a width of 1f1 or more and a height of 2 or more, which is provided between the holes 11 of the insulating plate 8 through which the rivets 4 pass, and is used to image creepage due to arc discharge. 1@- is a rubber backing installed between the insulating plate 8 and M3 and through which the rivet 4 is passed. 1+ is a bushing that contacts the rubber backing 10 and is penetrated by a rivet 4, insulating the terminal 7 from the backing 3.

According to the above embodiment, since the projections 6 of the rivet 4 are inserted into the four parts 9 of the insulating plate 8, the rivet 4 is fixed to the insulating plate 8 and prevented from rotating.

In the above embodiment, the insulating plate is provided with a recess, but it may also be a hole.

Next, the rotational torque of the rivet was measured for the above embodiment and the conventional example. As for the samples, the present invention example has the following: Rivet - Diameter 3FM (flange part 8rm) Protrusion provided on the rivet - Width and height both 0.5M Insulating plate - Material polybutylene terephthalate Thickness 1. 1
11j+ Four parts provided on the insulating plate - Width and depth both in order of 0.6 The conventional example is the same as the embodiment of the present invention except that the insulating plate without the four parts is used.

The rotational torque is measured by applying rotational force to the terminal and taking the value until it starts rotating.

As a result of the measurement, the inventive example was 7.9h3, while the conventional example was 3.8 and 9cx, and the former was about 2.2
More than double the value was obtained.

(Effects of the Invention) As described above, according to the present invention, since the protrusion provided on the rivet is inserted into the recess or hole provided on the insulating plate, the rotational torque of the rivet can be improved, and the l1li#I failure of the lead wire A capacitor case can be obtained that can reduce the amount of stress.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of a rivet used in an embodiment of the invention, Fig. 3 is a plan view of an insulating plate used in an embodiment of the invention, and Fig. 4 is a conventional rivet. The front sectional view of the lid of the capacitor case is shown. 1... Capacitor case, 3... Lid, 4...
Rivet, 5... Flange, 6... Protrusion, 7...
Terminal, 8... Insulating plate, 9... Four parts, 10...
bulkhead. Patent applicant: Hitachi Capacitor Corporation, /

Claims (2)

[Claims] (1) In a capacitor case that has a built-in capacitor element and can be sealed, a rivet having a protrusion inside the flange and penetrating the lid, a terminal connected to the tip of the rivet, and a protrusion on the flange are inserted. and an insulating plate having a recess or hole through which the rivet passes and is fixed to the lid. (2) The capacitor case according to claim 1, further comprising an insulating plate having partition walls between holes through which the rivets pass.