JPH08288178A - Ceramic capacitor - Google Patents

Abstract

PURPOSE: To obtain various kinds of capacitance values with a simple structure in a large ceramic capacitor. CONSTITUTION: A plurality of flat ceramic elements 4 are laminated between a pair of electrode plates 7a and 7b and compressed vertically by cylindrical containers 6a and 6b. The number of flat-plate elements 4 may be varied to obtain various kinds of capacitance values.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a porcelain capacitor,
In particular, it relates to the structure of a large variable porcelain capacitor.

[0002]

2. Description of the Related Art A conventional large porcelain capacitor is formed by vapor-depositing electrodes 2a and 2b on the upper and lower surfaces of a porcelain body 3, respectively, as shown in the sectional structure of FIG.
2b through electrode plates 7a and 7b, respectively, and connection terminals 1a and 1b.
It has a structure for fixing b.

[0003]

In the conventional large porcelain capacitor of this kind, the capacitance value is fixed, and in order to vary the capacitance, many types of capacitors are manufactured for each capacitance. Need to be prepared. Also, it is possible to connect capacitors in series or in parallel to make the capacitance variable, but in this case, a tool such as a special bolt is required to mount these capacitors, and a wider mounting is required. It has the disadvantage that it also requires space.

An object of the present invention is to provide a porcelain capacitor which can flexibly cope with various electrostatic capacitance values.

Another object of the present invention is to provide a porcelain capacitor capable of forming various values of capacitance only by using a single type of structure.

[0006]

A porcelain capacitor according to the present invention includes a pair of electrodes facing each other, a plurality of flat plate-shaped porcelain bodies laminated between the pair of electrodes, and these porcelain bodies. It is characterized in that it includes an insulator container which comes into close contact with a laminated body with an electrode.

[0007]

The capacitance is made variable according to the number of flat plate-shaped porcelain bodies laminated between a pair of electrodes.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

1A and 1B are views showing the structure of an embodiment of the present invention. FIG. 1A is a perspective view and FIG. 1B is an exploded view thereof. 2 is a cross-sectional view of FIG. 1 (A), and these figures and FIG. 4 are denoted by the same reference numerals.

Between the pair of electrode plates 7a and 7b, a plurality of flat plate-shaped porcelain bodies 4 are laminated and provided, and the connection terminals 1a and 1b are fixed to the electrode plates 7a and 7b, respectively. ing.

The laminated structure of these electrode plates 7a and 7b and the porcelain element body 4 has a cylindrical container (in this example, cylindrical) container 6 made of an insulating material.
It has a structure in which it is brought into close pressure contact with a and 6b. For this reason, a screw tap portion 61 is provided at the fitting portion between the two cylindrical containers 6a and 6b, and the two containers 6a and 6b are rotated by fitting them together.
The internal space between them becomes gradually narrower, and finally the laminated body of the electrode and the flat plate-shaped ceramic body can be brought into contact with each other by being almost completely pressed against each other.

As shown in the sectional view of FIG. 2, it is assumed that electrodes 2a and 2b are formed on each surface of the uppermost layer and the lowermost layer of each porcelain body 4 by vapor deposition.

When the porcelain bodies 4 are overlapped in this way,
It is unavoidable that the air gap 5 occurs as shown in FIG. Corona discharge occurs in the air gap 5 due to the difference in dielectric constant between the porcelain body 4 and the air in the air gap 5. Therefore, a resin such as silicon grease as a dielectric material is applied to the porcelain body 4 to eliminate the air gap 5 and suppress corona discharge.

It is obvious that a desired capacitance value can be obtained arbitrarily by simply increasing or decreasing the number of laminated flat plate-shaped porcelain bodies 4 between the pair of electrode plates 7a and 7b.

[0015]

As described above, according to the present invention, it is possible to obtain a large-sized porcelain capacitor which is extremely simple, inexpensive and highly reliable, only by increasing or decreasing the number of flat plate porcelain bodies laminated between the electrode plates. Therefore, there is an effect that the electrostatic capacitance can be easily changed and a high breakdown voltage can be obtained.

[Brief description of drawings]

1A is a perspective view of an embodiment of the present invention, and FIG. 1B is an exploded view thereof.

FIG. 2 is a sectional view of an embodiment of the present invention.

FIG. 3 is a diagram showing an example of generation of an air gap in the embodiment of the present invention.

FIG. 4 is a sectional view of a conventional large porcelain capacitor.

[Explanation of symbols]

 1a, 1b Connection terminal 2a, 2b Electrode 4 Flat plate ceramic body 5 Air gap 6a, 6b Cylindrical container 7a, 7b Electrode plate

Claims (3)

[Claims] 1. A pair of electrodes facing each other, a plurality of flat plate-shaped porcelain bodies that are stacked between the pair of electrodes, and an insulator that press-contacts a laminated body of these porcelain body and electrodes. A porcelain capacitor including a container. 2. The porcelain according to claim 1, wherein a dielectric agent such as silicon resin is applied to the flat plate porcelain body in order to eliminate an air gap generated in a laminated portion of the flat plate porcelain body. Capacitors. 3. The porcelain capacitor according to claim 1, wherein the number of laminated plate-shaped porcelain bodies can be increased or decreased to change the capacitance value.