JPH0726832Y2 - Molded capacitor element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a molded capacitor.

[Prior Art] Molded capacitors generally have a structure in which the periphery of a capacitor element is molded with a synthetic resin.
In this molded capacitor, it is difficult for the mold resin to infiltrate into the gap between the spiral uneven portions on both end faces of the winding formed by laminating the dielectric layer and the electrode layer of the capacitor element. When air voids are generated, there is a drawback that the insulation strength between the electrodes decreases. In order to eliminate such drawbacks, the applicant first stored a capacitor element in a container having a shape retention property, filled the container with an insulating gas, and molded the periphery of the container with a synthetic resin. A utility model registration application has been made for a capacitor in which a container-encapsulated capacitor element is formed by sealing an insulating gas in a container, and a synthetic resin is integrally molded around the assembly of a plurality of container-encapsulated capacitor elements. (Practical application Sho 62-162873).

As shown in FIG. 2, the container having shape retention used in the capacitor of this application is composed of a container main body 4a and a lid 4b, and degasses air in the container 4 and insulates the inside of the container 4. A gap 8 between the container body 4a and the lid 4b for introducing gas and a gap 7 between the lead lines 6 and 6'of the capacitor element 5 and the lead-out holes 7 and 7'of the lead lines 6 and 6 '. , 7'is provided.

The shape-retaining container 4 fills the surrounding of the capacitor element 5 to be filled with an insulating gas, and thus has a high insulating strength, and provides a container-containing mold capacitor excellent in noncombustibility and explosion proof. It is possible.

[Problems to be Solved by the Invention] However, the above-mentioned interior container 4 has a lead-out wire lead-out hole.
Since a gap for sucking air and filling the insulating gas is provided between 7, 7'and the lead wires 6, 6 ', the gap cannot be narrowed sufficiently, and therefore the mold resin spatters. However, there is a problem in that the yield tends to deteriorate.

The molded capacitor element of the present invention has been made in view of the above problems, and is intended to prevent deterioration of insulation due to saliva of the molding resin.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention stores a proper number of capacitor elements in a container, fills the container with an insulating gas, and surrounds the container. In a molded capacitor element that seals an insulating gas in a container by resin-molding, a hole for gas absorption / exhaust that communicates between the inner space and the outer space of the container is formed in the container. A porous body having a large number of pores of a size that allows gas to pass but does not allow the synthetic resin liquid to pass is provided on the front surface portion on the inner space side of the container.

[Embodiment] The present invention will be described in detail below with reference to FIG. 1 by taking an example in which the number of capacitor elements accommodated in a container is one.

The container 14 is composed of a container body 14a and a lid 14b thereof, and an eyelet terminal 12a for fixing the container body 14a and the lid 14b by inserting a pair of lead wires 16, 16 'of the capacitor element 15 into the container body 14a and the lid 14b, respectively. , 12b (12b is not shown in the drawing)
The lid 14b is further provided with a hole 13 for sucking and discharging gas, which communicates between the inner space and the outer space of the container 14.

To accommodate the capacitor element 15 in the container 14, first, one lead wire 16 'of the capacitor element 15 is inserted from the inside of the container body 14a into the eyelet terminal 12b and drawn out to the outside, and the capacitor element 15 is placed in the container body 14a. Put in. Next, lid 1
On the front surface on the inner space side of the gas suction / exhaust hole 13 formed in 4b,
There is provided a porous body A having a large number of pores that are permeable to air and do not allow the resin solution 10 'for molding (reference numeral 10' is not shown in the drawing) to pass through. Next, the other lead wire 16 of the capacitor element 15 contained in the container body 14a is inserted into the eyelet terminal 12a provided on the lid body 14b and pulled out to the outside, and the lid body 14b is attached to the container body 14a. , Eyelet terminal 12
The capacitor element 15 can be housed in the container 14 by fixing the lead wires 16 and 16 'to the a and 12b by soldering.

A container 14 accommodating the capacitor element 15 is filled with an insulating gas through a gas suction / exhaust hole 13 formed in a lid 14b, and a resin is molded around the container 14 to seal the insulating gas in the container 14. Thus, the molded capacitor element can be obtained.

[Operation] The gas suction / exhaust hole 13 serves as a gas exhaust passage when the air in the container 14 is exhausted, and serves as an insulating gas introduction passage when the container 14 is filled with insulating gas. When the flow of the mold resin liquid 10 'during resin molding enters the inside of the container 14 without stopping at the gas suction / exhaust hole 13 portion, the porous body A allows the entered mold resin liquid 10' to flow into the capacitor element 15. Prevents spitting on the wound end face.

[Effect] The molded capacitor element of the present invention can degas the air inside the container 14 through the gas suction / discharge holes 13 formed in the container 14 and fill the inside with insulating gas.

Further, when the synthetic resin 10 is molded around the container 14, the porous body A can prevent the mold resin liquid 10 'from spitting on the winding end face of the capacitor element 15, and the dielectric strength is deteriorated. Can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating an embodiment of the present invention, and FIG. 2 is a sectional view illustrating a conventional example. A ... Porous body, 1, 11 ... Mold capacitors, 12a, 12b ... Eyelet terminals, 13 ... Holes for sucking and discharging, 4, 14 ... Respective containers, 4a, 14a ... Respective container bodies, 4b, 14b ... Lid, 5, 15 ... Capacitor element, 6, 16, 6 ', 16' ... Leader wire, 7, 7 '
…… Leader wire insertion hole, 8,9 …… Gap, 1
0 …… Mold resin, 10 ′ …… Epoxy resin liquid.

Claims (1)

[Scope of utility model registration request] Claims: 1. A molded capacitor element in which an appropriate number of capacitor elements are housed in a container, the container is filled with an insulating gas, and the periphery of the container is resin-molded to seal the insulating gas in the container. The container is formed with a gas suction / exhaust hole that communicates between the inner space and the outer space of the container, and the gas is allowed to pass through the front surface of the inner space side of the container for the gas suction / exhaust hole to prevent passage of the synthetic resin liquid. A molded capacitor element comprising a porous body having a large number of pores formed therein.