JPS5852669Y2 - capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a capacitor with high airtightness at high temperatures.

As shown in Figs. 1 and 2, a conventional capacitor is connected to a terminal 4 which is connected to a terminal 4 fixed to an insulating sealing plate 3 by caulking or welding, and is housed in a metal case made of aluminum or the like. A fixing material 6 is injected into the interior of the capacitor element 5 to accommodate the capacitor element 1, an annular rubber backing 8 is fitted into a concave groove 7 provided on the outer peripheral edge of the insulating sealing plate 3, and a metal is inserted into the rubber backing 8. The opening of the case 5 is tightly sealed.

However, in the above-mentioned capacitor, the insulating sealing plate 3 and the metal case 5 are kept airtight via the rubber backing.
Rubber deteriorates or burns at high temperatures, resulting in leakage of impregnating liquid or poor airtightness, which has the disadvantage that it cannot be used as a high-temperature or nonflammable product.

Also, Utility Model Publication No. 35-10164, Utility Model Publication No. 35-21
As shown in Publication No. 056, there are capacitors in which the entire opening of the case, including the terminal lead-out part, is filled with resin or filler to keep it airtight. However, if the outer diameter of the capacitor is relatively large, resin There were drawbacks such as cracks occurring in the capacitor element, and impregnation liquid impregnating the capacitor element passing through the leads and causing liquid leakage.

The present invention was devised to eliminate the above-mentioned drawbacks, and aims to provide a capacitor that has high airtightness at high temperatures and can sufficiently withstand the internal pressure of the case.

Hereinafter, the present invention will be described with reference to an embodiment shown in FIGS. 3 and 4. Leads 2 led out from a capacitor element 1 are connected to terminals 4 fixed to an insulating sealing plate 3 by caulking, welding, etc. A fixing material 6 is injected into the metal case 5 and the capacitor element 1 is housed therein, and the tip of the opening of the metal case 5 sneaks into the concave groove 9 provided on the peripheral edge of the outer surface of the insulating sealing plate 3. Tighten it so that
The groove 9 is filled with resin 10 and sealed.

Since the present invention is constructed as described above, the insulating sealing plate 3 and the metal case 5 are bonded together by the resin 10 without using rubber to maintain airtightness, so there is no deterioration even at high temperatures, and the metal case 5 does not deteriorate even at high temperatures. Since the resin 10 is bonded to both sides of the open end of the cap 5, the bonding area becomes large, and the strength of the seamed portion can also be increased, so that the impregnating liquid will not leak.

Since the concave groove 9 provided in the insulating sealing plate 3 is filled with the resin 10, the resin 10 does not enter the capacitor element 1 during assembly.

In addition, as a result of increasing the pressure inside the metal case and measuring the breaking strength of the seamed part of the metal case 5, the conventional product was 20 to 30 kg.
/Cm2, whereas the product of this invention weighs 40 to 50kg/Cm2.
cm2, which is extremely high.

Note that the deeper the concave groove provided in the insulating sealing plate 3, the better the airtightness, and it is more effective if small irregularities are made on the sides and bottom of the groove. , W-shaped, etc. which form a concave portion have similar effects.

Furthermore, an explosion-proof valve 11 or a metal case 5 is installed on the insulating sealing plate 3.
If an explosion-proof mechanism is installed in the explosion-proof mechanism, the explosion-proof valve will operate reliably because the strength of the seamed part of the metal case is high.

As shown above, this invention is an extremely safe container that is highly airtight at high temperatures and can withstand high pressure resistance.
It has great industrial and practical value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional capacitor, Fig. 2 is an enlarged view of the main part of the sealing part of the capacitor shown in Fig. 1, Fig. 3 is a sectional view of a capacitor according to an embodiment of the present invention, and Fig. 4 is a sectional view of a capacitor according to an embodiment of the present invention. FIG. 4 is an enlarged view of a main part of the sealing part of the container shown in FIG. 3; 1: Condenser element, 2: Lead, 3: Insulating sealing plate,
4: Terminal, 5: Metal case, 9: Concave groove, 10: Resin, 11: Explosion-proof valve.

Claims (1)

[Scope of utility model registration request] A capacitor element, a terminal connected to a lead led out from the capacitor element, an insulating sealing plate that fixes the terminal and has a concave groove on the peripheral edge of the outer surface, and a capacitor element that accommodates the capacitor element and the tip of the opening that fits the capacitor element. A capacitor comprising a metal case wrapped tightly so as to fit into a groove of an insulating sealing plate, and a resin filled and sealed in the groove.