JPH0347325Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a capacitor in which a plurality of capacitor elements are connected in series and parallel and assembled so as to share a desired high voltage.

[Conventional technology]

Capacitor elements have low withstand voltage characteristics unless they are surrounded by an insulator. Therefore, when trying to obtain a high voltage capacitor using such capacitor elements, it is necessary to connect a large number of capacitor elements to share the high voltage, which increases the size and cost of the capacitor. .

For this reason, conventionally, as shown in FIG.
There are capacitors that are filled with an insulating gas such as SF ₆ gas to improve the withstand voltage characteristics of the capacitor element 22 and increase the shared voltage per capacitor element, thereby reducing the number of capacitor elements to be assembled. .

There are also high voltage capacitors in which the periphery of a collection of capacitor elements is integrally molded with synthetic resin.

[Problem that the invention attempts to solve]

By the way, in the case of a capacitor made up of a plurality of capacitor elements as described above, all of the plurality of capacitor elements must have desired withstand voltage characteristics.

That is, if even one of the plurality of capacitor elements is defective, the withstand voltage characteristics of the capacitor as a whole cannot be ensured.

Therefore, the withstand voltage characteristics of the plurality of capacitor elements housed in the container must be inspected to determine whether they are good or bad before being housed in the container. However, in the case of a capacitor housed in a container as described above, if the container is removed, the insulator around the capacitor element cannot be maintained, so it is necessary to check the quality of each capacitor element before storing the container. cannot be determined. Therefore, if you inspect the withstand voltage characteristics after accommodating multiple capacitor elements and filling the container with an insulator to form a capacitor, the desired withstand voltage characteristics will not be obtained and the entire capacitor will be defective. This caused problems such as increased material loss and wasted man-hours.

In particular, in the case of capacitors in which multiple capacitor elements are molded around synthetic resin, voids are likely to occur on the end faces of the capacitor elements during the molding process, causing corona discharge within one capacitor element. If a defective product that is easily damaged is included, the entire capacitor will be defective. in this case,
Even if the other capacitor elements are of good quality, they cannot be separated, so the problems of increased material loss and ineffective man-hours are even greater.

Therefore, this invention aims to provide a capacitor with a structure that allows the electrical characteristics such as the corona discharge starting voltage to be inspected for each capacitor element before the capacitor elements are assembled and the surroundings are molded with synthetic resin. That is.

[Means for solving problems]

In order to solve the above problems, this idea
A capacitor element is housed in a shape-retaining container, and a glass fiber material is wrapped around the outer circumferential surface of the container.
In addition, the container is filled with insulating gas, and the container is molded around the container with synthetic resin to seal the insulating gas inside the container to form a container-housed capacitor element, and a plurality of the container-housed capacitor elements are formed. The periphery of the individual aggregates was molded integrally with synthetic resin.

[Effect]

According to the above structure, a plurality of integrally molded container-housed capacitor elements are each housed in a container, each container is filled with insulating gas, and the container is surrounded by molded resin. Since the container-housed capacitor elements are sealed by , it is possible to inspect the withstand voltage characteristics of each container-housed capacitor element to determine its quality before assembling and molding the vessel-housed capacitor elements.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in Fig. 1, the capacitor of this invention is made by integrally molding a synthetic resin around an aggregate in which a plurality of container-housed capacitor elements 1 are connected in series and parallel. ,
Reference numeral 2 indicates an exterior formed by a mold. Further, reference numeral 3 indicates a bushing integrally formed by this mold.

The container-housed capacitor element 1 houses a capacitor element 5 in a container 4.
While filling an insulating gas such as SF ₆ gas or nitrogen gas, a glass fiber material 12 is wrapped around the outer circumferential surface of the container 4.
Further, the container 4 is molded around the container 4 with synthetic resin to seal an insulating gas inside the container 4, and can be manufactured as follows.

First, a container 4 is prepared.

That is, the container 4 consists of a container body 4a made of synthetic resin with an open top surface and a lid body 4b made of synthetic resin that fits on the top surface of the container body 4a. is capacitor element 5
A lead wire insertion hole 7 is formed into which the lead wire 6 is inserted. Further, the container 4 has an inner diameter slightly larger than the outer dimension of the capacitor element 5, which has a structure in which, for example, dielectric layers and electrode layers are alternately stacked in a spiral shape. In addition, a gap 8 formed on the fitting surface of the container body 4a and the lid body 4b and a gap 9 formed between the lead wire 6 and the lead wire insertion hole 7 are filled with insulating gas inside the container 4. When filling the container 4, an insulating gas flows into the container 4 from the outside.On the other hand, when molding the outside of the container 4 with synthetic resin, an insulating gas is poured into the container 4 to prevent the high clay synthetic resin from entering the container 4. It is set to

The material of the container 4 is preferably a hard material that has heat resistance, insulation properties, and shape retention properties, such as polypropylene resin or polyester.
There are FRP (reinforced plastics), etc.

Next, after housing the capacitor element 5 in the container body 4a, the lid 4b is placed on the container body 4a. At this time, the lead wire 6 is pulled out from the lead wire insertion hole 7 to the outside of the container 4.

Next, after wrapping the glass fiber material 12 around the outer peripheral surface of the container 4 containing the capacitor element 5, the container 4 is placed in a mold having an inner diameter slightly larger than the outer dimension of the container 4. Vacuum the inside of the mold. After this, an insulating gas such as SF ₆ gas or nitrogen gas is introduced into the mold. Next, a high clay synthetic resin, such as an epoxy resin, is injected between the mold and the container 4, and after the synthetic resin has hardened, the mold is released.

In this way, the outside of the container 4 is molded with synthetic resin, and the gap 8 formed between the container body 4a and the lid 4b of the container 4 and the lead wire 6 and the lead wire insertion hole 7 are formed. The gaps 9 formed in between are each sealed with molded synthetic resin, and the container 4 is filled with insulating gas.

In addition, the code|symbol 10 has shown the mold layer.

After that, a plurality of container-housed capacitor elements 1 manufactured as described above are connected in series and parallel and housed in a casting mold for forming an exterior, and then a synthetic resin is injected into the mold, and after curing. If the mold is released, a capacitor according to this invention can be obtained.

[Effect of idea]

As described above, according to this invention, operation tests such as corona discharge starting voltage can be performed on each container-housed capacitor element before it is assembled, so it is possible to select whether it is good or bad. This has the effect of reducing ineffective man-hours.

In addition, in the capacitor of this invention, each capacitor element is housed in a shape-retaining container, so the metal sprayed electrode part of each capacitor element that is electrically connected is protected against shrinkage during the molding process. It can prevent stress caused by expansion and contraction due to temperature changes during use, and has the effect of improving the reliability of electrical connections.

Additionally, the glass fiber material wrapped around the container is impregnated with the molding resin and comes into close contact with the outer surface of the container, which has the effect of preventing air gaps from forming between the molding resin and the outer surface of the container. .

Furthermore, since this container is reinforced with glass fiber material and does not deform due to expansion and contraction of the insulating gas sealed in the container, it also has the effect of preventing cracks in the molded resin layer.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a capacitor according to this invention, FIG. 2 is a partially enlarged cross-sectional view of FIG. 1, and FIG. 3 is a cross-sectional view of a conventional capacitor. DESCRIPTION OF SYMBOLS 1... Container-housed capacitor element, 2... Exterior, 4... Container, 5... Capacitor element, 10...
...Mold layer, 12...Glass fiber material.

Claims (1)

[Scope of utility model registration request] A capacitor element is housed in a shape-retaining container, and a glass fiber material is wrapped around the outer circumferential surface of the container.
In addition, the container is filled with insulating gas, and the container is molded around the container with synthetic resin to seal the insulating gas inside the container to form a container-housed capacitor element, and a plurality of the container-housed capacitor elements are formed. A capacitor characterized in that the periphery of the aggregate is integrally molded with synthetic resin.