JPS6028116Y2 - High voltage feed-through capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high voltage feed-through capacitor used as a noise filter for high frequency, high power equipment, such as microwave ovens, magnetrons for broadcasting equipment, or X-ray tubes.

Recently, high-power electromagnetic waves in the UHF and VHF bands have come to be used not only in industrial equipment such as broadcasting equipment and X-ray medical equipment, but also in microwave ovens, etc., and as their use increases, these devices Preventing noise pollution caused by electromagnetic waves leaking from sources has become an important issue.

In order to prevent such noise pollution, various noise filters have been proposed.

Figure 1 shows a conventional example of a high-voltage feedthrough capacitor used as a component of this type of noise filter.
The common electrode 6 of the magnetic capacitor 1 having the common electrode 6 is fixed onto the floating part 7a of the grounding fitting 7 by means such as soldering, and the magnetic capacitor 1
In the through holes 2, 3 of and the through holes 8, 9 of the grounding fitting 7,
Insulating tube with high elasticity such as silicone rubber 10.11
The through-hole conductor 12.13 is passed through the through-hole conductor 12.13 covered with the capacitor 1, and the through-hole conductor 12.13 is soldered to the electrode connecting body 14.15 fixed on the electrodes 4, 5 of the ceramic capacitor 1 by means such as soldering. It has a structure in which the ceramic capacitor 1 is inserted and further covered with an insulating resin 16 such as epoxy resin.

The insulating resin 16 includes an insulating case 18 fitted around the outer periphery of the floating portion 7a of the grounding fitting 7, and an insulating cover 17 inserted into the inner diameter of the floating portion 7a of the grounding fitting 7 so as to surround the through conductor 12°13. It is filled inside.

Most of the through conductors 12 and 13 have a straight tube shape, and one end thereof passes through the top plate 18o of the insulating case 18 and is led out to the outside, and the other end is formed into a flat plate shape by means of press working or the like. This is based on the tab terminals 12ay and 13a.

However, with the above-mentioned structure, as shown in FIG. After the insulating case 18 is fitted and attached to the floating part 7a of the grounding fitting 7 as shown in FIG. 2C, it is turned over and the insulating cover 17 is attached. Then, insulating resin is injected from the inside of the insulating cover 17, and the through hole 7b of the grounding fitting 7, the electrode connecting body 1
It is necessary to cast insulating resin through the through holes 14a and 15a of 4 and 15 as shown by arrow 49, which involves a troublesome process such as a reversing process, requires a large number of assembly steps, and lacks ease of assembly and mass production. was there.

Further, the connection point of the through conductor 12.13 to the main parts such as the ceramic capacitor 1 and the grounding fitting 7 is that the electrode connecting body 14.15 and the through conductor 12.13 are soldered only at one point. Since the distance from the connection point to the tab terminals 12a, 13a, which are the connection parts with the external circuit, is long, the tab terminals 12a, 13a, which are the connection parts with the external circuit, are long, so the tab terminals 12a,
When only a slight external force is applied to 13a, the electrode connection body 14
．． 15 easily peels off from the electrodes 4 and 5.

The present invention eliminates the above-mentioned drawbacks of the conventional method. It is possible to cast insulating resin without including the process of reversing the waist, has good assembly workability, is suitable for mass production, and has a strong support structure for the through conductor. An object of the present invention is to provide a highly reliable high voltage feed-through capacitor that does not cause peeling of electrode connectors.

In order to achieve the above object, the present invention surrounds a feedthrough capacitor fixed on one surface of a grounding metal fitting with an insulating case, and leads out a feedthrough conductor provided in the feedthrough capacitor to the other side of the grounding metal fitting. In the high-voltage feed-through capacitor, which is surrounded by an insulating cover and insulating resin is filled inside the insulating case and the insulating cover, the insulating case has an injection port for the insulating resin, and the insulating cover has the through-hole It is characterized by having a face plate through which the conductor is supported.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be specifically described below with reference to the accompanying drawings, which are examples.

FIG. 3A is an exploded perspective view of a high voltage feedthrough capacitor according to the present invention.

FIG. 3B is also an assembled cross-sectional view.

In the figures, the same reference numerals as in FIG. 1 indicate functionally identical components.

In this embodiment, the insulating case 18 includes the ceramic capacitor 1
Two sets of protrusions 19 to 22 are provided on the inner wall surface of the tubular body having a shape similar to that of the protrusions 19 to 22 facing each other at intervals.
The through conductor 12.13 is supported between 20, 21, and 22, and an injection port 23 for injecting the insulating resin 16 is provided around the protrusions 19-22.

In addition, the insulating cover 17 is integrally provided with a face plate 24 that divides the inside of the cylindrical inner diameter into upper and lower halves, and two insertion holes 25 and 26 are provided in the face plate 24, and the insides of the insertion holes 25 and 26 are passed through. The straight rod portions 12b and 13b of the conductors 12 and 13 are inserted through them.

The shapes of the insertion holes 25 and 26 are made approximately equal to the outer shape of the straight rod portions 12b and 13b.

Note that the partition portion 27 protruding from approximately the center of the face plate 24 is
The movement of the insulating resin 16 during curing and shrinkage of the insulating resin 16 or during a heat cycle test is restricted, and the occurrence of interfacial peeling, gaps, cracks, etc. between the ceramic body of the ceramic capacitor 1 and the insulating resin 16, and the accompanying This is provided for the purpose of preventing deterioration of temperature resistance characteristics and voltage resistance characteristics.

With the above-described structure, when filling the insulating resin 16, the grounding fitting 7, the ceramic capacitor 1, the electrode connector 14.
15 and the through conductors 12 and 13 are connected and fixed to each other by means such as soldering, and then the insulating case 18 and the insulating cover 17 are respectively attached to both sides of the grounding fitting 7 with the magnetic capacitor 1 side facing up. The insulating resin 16 can be injected and filled from the injection port 23 of the insulating case 18 in that state without being turned over.

As described above, according to the present invention, the insulating resin 16 can be injected and filled without requiring an inversion process, so that the assembly process is simplified and shortened, and mass productivity is improved.

The injected insulating resin passes through the through holes 14a, 15a of the electrode connectors 14, 15 and the through hole 7b of the grounding fitting 7, and enters the through holes 2, 3 of the ceramic capacitor 1 and the upper chamber of the insulating cover 17. is also filled.

In addition, in the present invention, a face plate 24 is provided horizontally within the inner diameter part of the insulating cover 17, and insertion holes 25, 2 provided in the face plate 24 are provided.
Since the through conductors 12 and 13 are supported by the through conductors 12 and 13, the through conductors 12 and 13 are connected to the electrode connectors 14 and 15.
The through conductor 12.13 is supported at two points, ie, the face plate 24, and the resistance force against external force applied to the through conductor 12.13 is increased.

As a result, the electrode connection body 14.15 is connected to the through conductor 12.13.
Accidents such as peeling due to external force applied to the film are eliminated, and reliability is improved.

Protrusions 19 to 22 are provided on the inner diameter surface of the insulating case 18 in the vicinity of the injection port 23, and the tab terminal portions 12a and 13a of the through conductor 12.13 are connected to each other by the protrusions 19 to 22.
Since the structure is such that the through conductor 12 is received from below,
．． 13 is positioned in the longitudinal direction by these protrusions 19 to 22, which facilitates the positioning operation of the through conductor 12.13.

Furthermore, in the completed state, the through conductors 12, 13 are received by these protrusions 19 to 22, and have a large resistance to external forces applied in the length direction, and are also prevented from shifting in the left and right direction by the surrounding insulating resin 17. Because it is done,
The resistance force against external forces applied to the through conductors 12 and 13 becomes even greater.

As described above, the present invention surrounds the feedthrough capacitor fixed on one surface of the grounding metal fitting with an insulating case, and also leads out the feedthrough conductor provided in the feedthrough capacitor to the other side of the grounding metal fitting and surrounds it. In the high voltage feed-through capacitor surrounded by an insulating cover and filled with an insulating resin inside the insulating case and the insulating cover, the insulating case has an injection port for the insulating resin, and the insulating cover penetrates the through conductor. Since the insulating resin is characterized by having a face plate that supports the insulating case, the insulating resin can be cast from the injection port of the insulating case without requiring an inversion process, and the assembly workability is good and mass production is possible. Moreover, the support structure of the through conductor is a solid two-point support structure, and it is possible to provide a highly reliable high-voltage feed-through capacitor that does not cause peeling of the electrode connection body.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional high-voltage feedthrough capacitor;
Figures a, b, and c are also diagrams explaining the assembly method,
FIG. 3A is an exploded perspective view of a high voltage feedthrough capacitor according to the present invention, and FIG. 3B is an assembled sectional view thereof. 1...Magnetic capacitor, 7...Grounding fitting, 12.13...Through conductor, 14, 15...
... Electrode connection body, 16 ... Insulating resin, 17
...Insulation cover 18 ...Insulation case, 23 ...Inlet, 24 ...Face plate, 2
5, 26...Insertion hole.

Claims (1)

[Scope of utility model registration request] The outer periphery of the feedthrough capacitor fixed on one surface of the grounding metal fitting is surrounded by a cylindrical insulating case whose one end side facing the shaft is fixed to one side of the grounding metal fitting, and the feedthrough conductor provided in the feedthrough capacitor is , passing through the inner diameter part of the insulating case and the feedthrough capacitor, leading out to the other side of the grounding fitting and surrounding it with an insulating cover, and filling the inside of the insulating case and the insulating cover with an insulating resin. In the high voltage feed-through capacitor, the insulating case has an injection port for the insulating resin on the other end in the axial direction, and a protrusion that receives the terminal portion of the feed-through conductor from below on the inner diameter surface near the injection port. A high-voltage feed-through capacitor, characterized in that the insulating cover has a face plate that extends and supports the feed-through conductor.