JPH0419787Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a high-voltage feedthrough capacitor used as a noise filter in high-frequency, high-power equipment, such as microwave ovens, broadcasting magnetrons, or X-ray tubes. On the surface of the floating part of the grounding fitting,
The feedthrough capacitor is fixed, and an insulating case surrounding the feedthrough capacitor is fitted and attached to the outer periphery of the floating part, and an insulating cover is fitted and inserted into the recessed part that is the inner diameter of the floating part, and the insulating case and In a feed-through capacitor that is surrounded by an insulating cover and filled with insulating resin inside and outside,
By using an insulating cover with an inclined surface at the corner of the edge that contacts the inner wall surface of the recessed part of the grounding metal fitting, the contact area between the insulating cover and the grounding metal fitting can be expanded, making it moisture resistant. It is designed to improve the durability and withstand voltage characteristics.

4. Prior Art FIG. 4 is an exploded perspective view of a conventional feedthrough capacitor, and FIG. 5 is a front partial sectional view of a conventional feedthrough capacitor. The common electrode 6 of the feedthrough ceramic capacitor 1 having the electrode 6 is fixed onto the floating portion 71 of the grounding fitting 7 by means such as soldering, and the through holes 2 and 3 of the feedthrough ceramic capacitor 1 and the grounding fitting are fixed. Through-hole conductors 11 and 12 covered with insulating tubes 9 and 10 are passed through the through-holes 8 of 7, and these through-conductors 11 and 12 are soldered and fixed onto the electrodes 4 and 5 of the through-hole ceramic capacitor 1. It is inserted into the electrode connectors 13 and 14 by means such as soldering.

The grounding metal fitting 7 is formed by drawing a metal plate such as an iron plate, so that the middle part of one side is
A floating portion 71 rising from the planar outer peripheral edge 72 is projected at an appropriate height, and a concave portion 73 serving as an inner diameter portion of the floating portion 71 is opened on the other surface side.
An insulating case 17 is fitted onto the outer periphery of the capacitor 1 so as to surround the through-hole ceramic capacitor 1, and an insulating cover 18 is fitted into the recess 73 on the other side so as to surround the through-hole conductors 11 and 12. It has been fitted and inserted. Then, the insulating case 17 and the insulating cover 18
The inside and outside of the through-hole ceramic capacitor 1 surrounded by the capacitor 1 are filled with insulating resins 15 and 16 made of epoxy resin or the like to ensure moisture resistance and insulation. The insulating case 17 and the insulating cover 18 are made of molded products such as so-called engineering plastics such as PBT. Insulating case 1 of through conductors 11 and 12
At the end on the 7 side, a Faston tab terminal part 111,
121 are formed integrally.

Problems to be Solved by the Invention As described above, in conventional feedthrough capacitors, the grounding fitting 7 is obtained by using a metal plate material such as an iron plate and subjecting it to drawing processing. However, although the drawing process is good for mass production, it is very difficult to form the bent part at right angles, and the rising part 74 from the raised part 71 to the outer peripheral edge 72 and the bent parts at both ends thereof are As shown enlarged in FIG. 6, it is bent with a certain curvature. On the other hand, the insulating cover 18 that is fitted and inserted into the recessed part 73 of the grounding fitting 7 is a resin molded product, and the corner 183 between the outer peripheral surface 181 and the end surface 182 is formed at a substantially right angle. There is. Therefore, when the insulating cover 18 is fitted and inserted into the recessed part 73, as shown in FIG. The corners 183 of the insulating cover 18 abut, and the inner wall surface 731 of the recessed part 73 and the insulating cover 18 come into linear contact. As a result, the inner wall surface 73 of the concave portion 73
1 and the insulating cover 18 becomes very short, and the moisture infiltration prevention effect on the contact surface becomes insufficient, and moisture passes through the interface between the grounding fitting 7 and the insulating resin 16 and follows the path shown by arrow A. Then, there was a problem in that it penetrated into the inner diameter side of the penetrating ceramic capacitor 1, resulting in a withstand voltage failure.

If the rising portion 74 of the grounding fitting 7 is made higher, the path I can be enlarged, but in this case, the overall shape becomes larger and it is not possible to meet the demand for miniaturization.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention protrudes from the middle part of one side at an appropriate height from the outer periphery, and from the other side. a grounding metal fitting having a concave portion that becomes an inner diameter portion of the floating portion;
a feedthrough capacitor fixed on the surface of the floating portion of the grounding fitting; an insulating case that is fitted and attached to the outer periphery of the floating portion and surrounding the feedthrough capacitor; In the feed-through capacitor, the feed-through capacitor includes an insulating cover that is fitted and inserted into a recessed portion, and an insulating resin filled inside and outside of the feed-through capacitor surrounded by the insulating case and the insulating cover, wherein the insulating cover is connected to the ground. A corner of the end piece that comes into contact with the inner wall surface of the concave portion of the metal fitting is an inclined surface.

Function In the feed-through capacitor according to the present invention, the corner of the end edge of the insulating cover that comes into contact with the inner wall surface of the recessed part of the grounding fitting is an inclined surface, so that the insulating cover can be inserted into the recessed part of the grounding fitting. When the grounding fitting is fitted and inserted into the
The inclined surface at the corner of the end edge of the insulating cover closely contacts the inner wall surface of the recessed portion to form a long contact surface. Therefore, the moisture infiltration prevention effect at the contact surface between the inner wall surface of the recess and the insulating cover is enhanced, and the withstand voltage characteristics are improved.

Embodiment FIG. 1 is a front partial sectional view of a feedthrough capacitor according to the present invention, FIG. 2 is an enlarged sectional view of the main parts,
FIG. 3 is an enlarged perspective view of the insulating cover 18. In the figures, the same reference numerals in FIGS. 4 to 6 indicate identical components. In this embodiment, the insulating cover 18 has a concave portion 73 of the grounding fitting 7.
By chamfering the corner of the end edge that comes into contact with the inner wall surface 731 of
4 is formed. The inclined surface 184 is a curved surface or a flat surface according to the shape of the inner wall surface 731 of the recessed portion 73. The insulating cover 18 is formed by injection molding of an insulating resin, and can be easily obtained even if it has the inclined surface 184 as described above.

When the insulating cover 18 having the above structure is fitted and inserted into the recessed part 73 of the grounding fitting 7, even if the inner wall surface 731 of the recessed part 73 is curved, the corner of the edge of the insulating cover 18 The inclined surface 184 of the concave portion 73
A long contact surface is formed between the insulating cover 18 and the grounding metal fitting 7. Therefore, the inner wall surface 731 of the concave portion 73 and the insulating cover 1
The moisture infiltration prevention effect at the contact surface with the inclined surface 184 of No. 8 is enhanced, and the withstand voltage characteristics are enhanced.

Effects of the invention As described above, according to the invention, by using an insulating cover whose end edge that contacts the inner wall surface of the recessed part of the earthing metal fitting has an inclined surface, the grounding metal fitting can be While keeping the height of the floating part low,
It is possible to provide a feed-through capacitor with improved moisture resistance and withstand voltage characteristics by increasing the contact area between the insulating cover and the grounding metal fitting.

[Brief explanation of the drawing]

FIG. 1 is a front partial sectional view of a feedthrough capacitor according to the present invention, FIG. 2 is an enlarged sectional view of the main parts,
FIG. 3 is an enlarged perspective view of an insulating cover, FIG. 4 is an exploded perspective view of a conventional feedthrough capacitor, FIG. FIG. 1... Feedthrough capacitor, 4, 5, 6... Electrode,
7...Grounding metal fitting, 71...Floating portion, 72...Outer periphery, 73...Concave portion, 731...Inner wall surface, 1
1, 12... Penetrating conductor, 15, 16... Insulating resin, 17... Insulating case, 18... Insulating cover,
184...Slope surface.

Claims (1)

[Scope of utility model registration request] a grounding fitting having a raised part protruding from an intermediate part on one side and a recessed part serving as an inner diameter part of the floating part opened on the other side; an insulating case that is fitted and inserted on the outer periphery of the floating portion and surrounds the feedthrough capacitor; and an insulating cover that is fitted and inserted into the recessed portion on the other side of the grounding fitting;
In the feed-through capacitor comprising the insulating case and an insulating resin filled inside and outside of the feed-through capacitor surrounded by the insulating cover, the insulating cover has an edge that comes into contact with an inner wall surface of the concave portion of the grounding fitting. A feed-through capacitor characterized by having sloped corners.