JPS5930521Y2 - 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, X-ray medical equipment, but also in consumer equipment such as microwave ovens, and as their usage increases. , Prevention of noise pollution caused by electromagnetic waves leaking from these devices 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 feed-through type capacitor used as a component of this type of noise filter.
Dielectric porcelain 1 with two through holes 2 and 3 arranged in parallel in the thickness direction
Mutually independent electrodes 4 and 5 and a common electrode 6 are provided around the through-holes 2 and 3 on both sides of the grounding member 7, and the common electrode 6 is fixed to the floating part 7a of the grounding fitting 7 in opposition to each other. Through holes 2.3 in body porcelain 1 and through holes 9, 1 in grounding fitting 7
The through conductors 11 and 12 passed through the electrode connecting body 1
3.14, it has a structure in which it is fixed to the electrodes 4 and 5 by means such as soldering.

On the other side of the grounding fitting 7 from which the through conductors 11 and 12 are led out, there is a cylindrical insulating cover 8 made of an insulating material such as synthetic resin.
are inserted so as to surround the through conductors 11 and 12.

In addition, the bottom of the insulating cover 8, the dielectric ceramic 1, the electrode connection body 1
3.14 and the portion of the through conductor 11.12 covered with the elastic insulating tube 15.16 is filled with an insulating resin 17 such as epoxy resin.

The conventional high-voltage feedthrough capacitor described above has a structure in which two feedthrough capacitors are provided in a single dielectric ceramic 1, so it has the advantage of being compact.

However, since the electrodes 4 and 5 are formed on the end face of the dielectric ceramic 1 in the thickness direction and are perpendicular to the through conductor 11.12, the through conductor 11.1 is connected to the electrodes 4 and 5.
2, the electrode connecting body 13
．． 14 is required, which has the drawback of requiring a large number of parts and increasing costs.

In addition, when fixing the ceramic capacitor on the grounding metal fitting 7, the common electrode 6 is placed in two-dimensional contact with one surface of the grounding metal fitting 7, and is soldered. Misalignment easily occurs on the grounding metal fitting 7, and the gap between the through conductor 11, 12 and the grounding metal fitting 7 fluctuates, which may lead to variations in withstand voltage characteristics and the like.

The present invention eliminates the above-mentioned conventional drawbacks, directly fixes the through conductor and electrode, eliminates the electrode connection body, reduces the number of parts, and improves the positioning of the magnetic capacitor with respect to the grounding fitting and the positioning of the grounding electrode. It is an object of the present invention to provide a high voltage feed-through capacitor that can be easily and reliably connected.

In order to achieve the above object, the high voltage feedthrough capacitor according to the present invention is a ceramic capacitor in which an outer circumferential electrode and an inner circumferential electrode are provided on the outer circumferential surface of dielectric ceramic having a through hole and on the inner circumferential surface of the through hole. , a through conductor that passes through the through hole of the ceramic capacitor and is fixed to the inner peripheral electrode, and a cylindrical portion having an inner diameter that matches the outer diameter of the ceramic capacitor and a depth that is larger than the thickness of the ceramic capacitor. and a grounding fitting in which the magnetic capacitor is housed inside the cylindrical portion and its outer peripheral electrode is fixed to the inner circumferential surface of the cylindrical portion; It is characterized by having a pair of insulating outer cases that are fitted and inserted from both sides, and an insulating resin filled around the ceramic capacitor inside the pair of outer cases.

The content of the present invention will be specifically explained in detail with reference to the accompanying drawings, which are examples.

FIG. 2 is a front partial sectional view of a high voltage feedthrough capacitor according to the present invention, and FIG. 3 is a bottom view thereof.

In the figure, 18 is a ceramic container. In this embodiment, inner circumferential electrodes 2 are provided on the inner circumferential surface and the outer circumferential surface of a dielectric ceramic 20 formed in an annular shape with a through hole 19, respectively.
1 and an outer peripheral electrode 22 are provided.

23 is a through conductor.

The through conductor 23 passes through the through hole 19 of the ceramic container 18 and is directly fixed to the inner peripheral electrode 21 of the through hole 19 by, for example, soldering.

With such a structure, the conventional electrode connector is not required, the number of parts is reduced, and the conductive connection between the through conductor 23 and the inner circumferential electrode 21 can be easily and reliably established, resulting in cost reduction and This can contribute to improving reliability.

24 is a grounding metal fitting.

The grounding fitting 24 is provided with a cylindrical portion 24 a whose inner diameter matches the outer diameter of the ceramic capacitor 18 and whose depth in the axial direction is larger than the thickness of the ceramic capacitor 18 .
A ceramic capacitor 18 is fitted in the inner part a, and its outer circumferential electrode 2
2 is fixed to the inner peripheral surface of the cylindrical portion 24a by soldering or the like.

The end of the cylindrical portion 24a is constricted to have a narrow inner diameter to form an annular seat 24b for receiving the ceramic capacitor 18.

In this way, in the present invention, the cylindrical portion 2 of the grounding fitting 24
Positioning of the magnetic capacitor 18 with respect to the grounding fitting 24 and conductive connection of the outer peripheral electrode 22 are completed by simply fitting the magnetic capacitor 18 into the grounding fitting 24.
The work of assembling the ceramic capacitor 18 into the capacitor becomes very easy.

Reference numeral 25 denotes an insulating resin such as epoxy resin filled around the ceramic capacitor 18, and is provided to improve the moisture resistance, dielectric strength voltage characteristics, arc resistance characteristics, etc. of the ceramic capacitor 18.

Reference numerals 26 and 27 denote exterior cases that are fitted into the cylindrical portion 24a of the grounding fitting 24 from both sides of the ceramic container 18, and are made of an insulating resin such as nylon or polybutylene terephthalate.

Partition plates 28 and 29 having resin flow holes 28 a and 29 a are integrally arranged in the inner diameter portion of the outer case 26 and 27 .

The insulating resin 25 has resin flow holes 28 a and 29 a
It passes through and is filled between the partition plates 28 and 29 and the ceramic capacitor 18.

30 is a magnetic material such as ferrite provided around the through conductor 23 in the space above the partition plate 28 .

This magnetic body 30 acts as an inductor, and provides a better noise damping effect than a capacitor alone.

However, this magnetic body 30 can also be omitted.

In the embodiment, a double type is shown in which two penetrating type capacitors having the above structure are provided on the left and right sides of the grounding fitting 24, but a continuous type can be used.

As mentioned above, the high voltage feedthrough capacitor according to the present invention is
A ceramic capacitor having an outer circumferential electrode and an inner circumferential electrode provided on an outer circumferential surface of dielectric ceramic having a through hole and an inner circumferential electrode on the inner circumferential surface of the through hole; a through-conductor, and a cylindrical portion having an inner diameter that matches the outer diameter of the ceramic container and a depth greater than the thickness of the ceramic container; a grounding fitting fixed to the inner circumferential surface of the cylindrical portion; a pair of insulating exterior cases fitted and inserted into the inner diameter portion of the cylindrical portion of the grounding fitting from both sides of the ceramic capacitor; Since the capacitor is characterized by having an insulating resin filled around the ceramic capacitor inside the exterior case, the following effects can be obtained.

(1) It is possible to omit the conventionally required electrode connector, reduce the number of parts and assembly man-hours, and achieve cost reduction.

(2) When positioning the magnetic capacitor to the grounding metal fitting and connecting the electrodes, it is only necessary to fit the magnetic capacitor into the cylindrical part of the grounding metal fitting, which greatly simplifies the work of assembling the magnetic capacitor into the grounding metal fitting, and also makes it possible to connect the magnetic capacitor to the grounding metal fitting. The reliability of the connection is improved.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional high-voltage feedthrough capacitor;
The figure is a partial front sectional view of a high voltage feedthrough capacitor according to the present invention, and FIG. 3 is a bottom view thereof. 18... Ceramic capacitor, 22... Outer electrode, 19... Through hole, 23... Through conductor, 20... Dielectric ceramic , 24...
・Grounding metal fitting, 21... Inner circumferential electrode, 24 a...
...tube section.

Claims (1)

[Scope of utility model registration request] A ceramic capacitor having an outer circumferential surface of dielectric ceramic having a through hole and an outer circumferential electrode and an inner circumferential electrode provided on the inner circumferential surface of the through hole; a cylindrical portion having an inner diameter that matches the outer diameter of the ceramic capacitor and a depth greater than the thickness of the ceramic capacitor; a grounding fitting having an electrode fixed to the inner peripheral surface of the cylindrical portion; a pair of insulating exterior cases fitted and inserted into the inner diameter of the cylindrical portion of the grounding fitting from both sides of the ceramic capacitor; A high voltage feed-through capacitor comprising an insulating resin filled around the ceramic capacitor inside a pair of exterior cases.