JPH0452986Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a capacitor sealing structure using a non-circular outer case.

[Conventional technology]

Generally, in electrolytic capacitors, a non-circular case, such as a round case, is used for the exterior case that houses the capacitor element in order to reduce the size and to accommodate the installation location. In an exterior case formed of a metal such as aluminum, a sealing member that matches the shape of the opening is inserted into the opening, and the opening is crimped and sealed.

[Problem that the invention attempts to solve]

In an exterior case where the opening has a non-circular shape such as a square or a circular shape, it is difficult to tighten the opening evenly, and the molding condition and the shape of the sealing member affect the airtightness of the exterior case. It gives.

Therefore, the present invention aims to provide a capacitor sealing structure that improves airtightness by sealing the outer case not only when the opening of the outer case housing the capacitor element is circular but also when the opening is non-circular. purpose.

[Means for solving problems]

As illustrated in FIG. 1, the capacitor sealing structure of this invention consists of reinforcing members (hard insulating plates 6, 8) provided on both sides of an elastic member (elastic plate 10).
The elastic member is held between the reinforcing members, and the protrusion 12 protruding from one of the reinforcing members is passed through the elastic member and fixed to the other reinforcing member, thereby compressing the elastic member between the reinforcing members. The present invention is characterized in that a sealing body 4 held by a holder is used.

[Effect]

When an elastic member (elastic plate 10) is sandwiched between reinforcing members (hard insulating plates 6, 8) and held in a compressed state,
A peripheral portion of the elastic member can protrude from the periphery of the reinforcing member.

When the sealing body 4 is made with such an elastic laminated structure and the sealing body 4 is inserted into the outer case 2,
The elastic member protruding from the reinforcing member is pressed against the inner wall surface of the opening of the outer case 2, even if the opening is non-circular, and the airtightness of the outer case 2 is maintained.

[Embodiment] FIG. 1 shows an embodiment of the capacitor sealing structure of this invention.

The sealing body 4 that seals the exterior case 2 is constructed by sandwiching an elastic plate 10 having a high elastic force as an elastic member between hard insulating plates 6 and 8 made of, for example, thermoplastic synthetic resin as a reinforcing member. For example, two protrusions 1 protrude from the hard insulating plate 6 of
2 is held in a compressed state by locking or adhering it to the other hard insulating plate 8.
Then, a part of the elastic plate 10 protruding from the periphery of the hard insulating plates 6 and 8 is fitted into a recess 14 formed in the outer case 2, and is brought into pressure contact with the inner wall surface of the outer case 2 to maintain airtightness. There is. The recess 14 is
It is not directly related to maintaining the airtightness of the outer case 2, but is for fixing the sealing body 4. Therefore, the shape of the recess 14 may be semicircular, rectangular, or triangular, depending on the elasticity of the sealing body 4. The surface is set to be in close contact with the plate 10.

As shown in FIG. 2, the outer case 2 is, for example, a cylindrical cylinder formed from a metal plate such as aluminum, and has a recess 14 recessed from the inner surface to the outer surface at the opening thereof. This exterior case 2 houses, for example, a capacitor element 16 wound in a circular shape, and rod-shaped anode and cathode terminals 18 and 20 are drawn out from the end faces thereof. And each terminal 18, 20 is
It penetrates the sealing body 4 of the exterior case 2 and is drawn out to the outside.

Further, the hard insulating plates 6 and 8 of the sealing body 4 are processed into a shape that matches the opening of the outer case 2. Is the elastic plate 10 also equal to the hard insulating plates 6 and 8?
A similar shape is used, which is larger than that, and its material includes, for example, a hard insulating plate 6, as shown in A in FIG.
When a force F is applied to the hard insulating plates 6 and 8, the material used is such that the peripheral portion thereof protrudes from the periphery of the hard insulating plates 6 and 8 in a compressed state, as shown in FIG. 3B. Therefore, the elastic plate 10 is made of, for example, low-grade rubber such as unvulcanized rubber. The use of unvulcanized rubber is advantageous in the case of electrolytic capacitors in that it does not react with the electrolyte.

As shown in FIG. 4, the hard insulating plate 6 is provided with two parts in order to maintain a distance from the hard insulating plate 8 to the extent that the elastic plate 10 is in a specific compressed state.
The protruding portion 12 of the book is provided integrally, and the terminal 1
A hole 22 for passing the holes 8 and 20 is formed.
Therefore, in the hard insulating plate 8, a hole 26 through which the protrusion 12 passes and a hole 28 through which the terminals 18 and 20 pass are formed. Further, the elastic plate 10 is provided with a hole 30 through which the protrusion 12 passes and a hole 22 through which the terminals 18 and 20 pass. The elastic plate 10 is sandwiched and compressed between the hard insulating plates 6 and 8 thus formed, and the protrusion 12 protruding from the hard insulating plate 6 is attached to the elastic plate 1.
0 and the hard insulating plate 8 and protruding to the back side of the hard insulating plate 8. The tip of the protrusion 12 is heated and molded to be locked to the hard insulating plate 8, or the surface of the hard insulating plate 8 is By joining by heat welding, ultrasonic welding, or the like, as shown in FIG. 5, a sealing body 4 having an elastic laminated structure in which the elastic plates 10 are held in a compressed state is obtained.

Therefore, if the exterior case 2 is sealed using such a sealing body 4, the elastic plate 10 and the inner surface of the exterior case 2 will be securely connected even when the opening of the exterior case 2 is not only circular but also non-circular. Since it is held in a press-contact state, the outer case 2 can be reliably sealed, and
A sealed state with high airtightness is obtained, and since the adhesion between the terminals 18, 20 and the elastic plate 10 is improved inside the sealing body 4, the airtightness at the drawn-out portions of the terminals 18, 20 is also improved. When the non-circular exterior case 2 is sealed using such a sealing body 4, sufficient airtightness is maintained even if the crimping process around the opening and the opening end is omitted. It is.

By the way, the sealing body 4, as shown in FIG.
A supporting member 34 such as a resin tube or a resin rod is installed inside the outer case 2, and as shown in FIG.
A stepped portion 36 may be provided inside the exterior case 2 for support. In this way, the capacitor element 16 can be fixed together with the sealing body 4 inside the outer case 2, and the vibration resistance performance is improved.

Further, the recess 14 that holds the sealing body 4 is deep enough to accommodate the large protruding elastic plate 10, for example.
It may also have a rectangular shape. In this way, the degree of adhesion between the elastic plate 10 and the inner wall surface of the exterior case 2 can be further increased.

In addition, in the embodiment, a case has been described in which the crimping process of the opening end and the side surface of the exterior case 2 is omitted, but such crimping process may be performed for reinforcement or the like.

Further, in the embodiment, an electrolytic capacitor has been described, but this invention can be applied to capacitors other than electrolytic capacitors.

[Effect of idea]

As explained above, according to this invention, since the sealing body in which the elastic member is held in a compressed state between the reinforcing members is used, the opening of the exterior case in which the capacitor element is to be accommodated is not only circular but also rectangular. Even in the case of a non-circular shape such as a circular shape, a highly airtight seal can be performed and a stable sealing state can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the capacitor sealing structure of this invention, Fig. 2 is a perspective view showing the outer case and the capacitor element, and Figs. 3, 4, and 5 show the structure of the sealing body. 6 and 7 are cross-sectional views showing other embodiments of the capacitor sealing structure of this invention. 4... Sealing body, 6, 8... Hard insulating plate (reinforcing member), 10... Elastic plate (elastic member), 12... Protruding portion.

Claims (1)

[Scope of utility model registration request] By sandwiching the elastic member between reinforcing members provided on the front and back sides of the elastic member, and causing a protrusion protruding from one of the reinforcing members to penetrate the elastic member and fixing it to the other reinforcing member, A sealing structure for a capacitor, characterized in that a sealing body is used in which the elastic member is held in a compressed state between the reinforcing members.