JPS598032B2 - Hermetic sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetic sealing device used when airtightness or watertightness is required, for example, in terminal conductors or conduits of electrical equipment, appliance parts, etc.

FIG. 1 is a sectional view of the main parts of a conventional hermetic sealing device.
In the figure, reference numeral 1 denotes a sealing body forming a terminal conductor made of copper, brass, etc., and numeral 2 denotes a sealing member formed of resin such as epoxy resin for sealing the sealing body 1.

The contact surface of the sealing main body 171) with the sealing member 2 is formed in a wave shape. Furthermore, the hermetic sealing device includes:
If there is a temperature difference between when the sealing member 2 is cast or molded, or if the ambient temperature changes during use, etc.
In order to prevent a gap from being formed on the sealing surface due to the difference in thermal expansion coefficient between the sealing main body 1 and the sealing member 2 and thereby reducing the sealing function, the sealing portion is formed as shown in FIG. The length ′ is made as long as possible. There have also been attempts to prevent peeling by fixing the sealing surfaces of the sealing body 1 and the sealing member 2 with adhesive, but in these conventional devices, the length l of the sealing part is increased. For current terminals, the cross-sectional area of the sealing body 1 used as a conductor is uneconomically large in order to suppress the temperature rise of the sealing part (the sealing part is insulated by the sealing member 2). (Since most of the heat generated in this part needs to be carried out in the axial direction of the sealing body 1, it is necessary to lower the electrical resistance and thermal resistance of this part.) This also increases the difficulty of hermetically sealing. As a result, the sealing function deteriorated, making it difficult to completely maintain the sealing function over many years. In addition, conventionally, attention has been focused only on the sealing function between the sealing body 1 and the sealing member 2, but in order to perfect the function of the sealing device, it is necessary to further improve the sealing body 1 and the base to which it is attached. Care must also be taken to prevent peeling from the base.

A perfect sealing machine can only be achieved by ensuring the sealing function between the base and the sealing member 2. ability will be achieved. However, conventionally, such problems have not been solved, so large equipment that is particularly affected by the difference in thermal expansion, such as gas insulation circuit breakers, boiling cooling electrical equipment using refrigerants such as fluorocarbons, etc., has a high degree of hermetic sealing. It has been difficult to apply hermetic sealing devices to products that require This invention was made in view of the above-mentioned points, and aims to provide a simple, inexpensive, and highly reliable hermetic sealing device that can be applied to large-scale equipment. . The present invention will be explained below based on the illustrated embodiments.

Fig. 2 shows a state in which the sealing body 1 is sealed and fixed to the base 5 via the sealing member 2, and a collar member 4a having an L-shaped cross section is welded to the outer periphery of the sealing body 1. Alternatively, it is fixed by means such as brazing. Further, an inverted L-shaped annular member 4b is extended by means such as welding or brazing at the upper end of the periphery of the hole 5a of the base 5, which faces the periphery of the sealing main body 1. The bent portions of the collar member 4b and the collar member 4a are fitted to each other. However,
Even if a peeling phenomenon occurs between the sealing body 1 and the sealing member 2 due to the reasons mentioned above, the sealing function of the sealing body is maintained by the flange member 4a.

In other words, in the conventional device, the gap created by the difference in coefficient of thermal expansion between the sealing body 1 and the sealing member 2 directly forms a leakage path, but in the device according to the present invention, this leakage path is formed by the flange member 4a. The sealing function can be completely maintained by this collar member 4a. Therefore, the length of the sealing portion may be set to the minimum length in consideration of external mechanical force, and an inexpensive and compact sealing device can be obtained. Further, according to the structure of the present invention, the length of the sealing portion is increased by the creeping surface of the flange member 4a, and since the heat generated in the sealing body 1 does not directly affect the flange member 4a, the flange member 4a Since peeling between the sealing members 2 is almost eliminated,
There is also the secondary effect that the deterioration of the sealing function due to this can be more effectively prevented. In order to improve sealing and functionality, it is desirable that the thickness of the flange member 4a be as thin as possible, and it is also effective to provide a plurality of flange members as necessary. Furthermore, if the surface of the flange member 4a is coated with a primer to improve adhesion to the sealing member 2 before being sealed with a resin material, the responsiveness of the sealing member 2 to expansion and contraction due to heat can be improved. As the temperature increases, the sealing function can be further improved. The same effect can be achieved with the annular member 4b, and a more complete sealing function between the sealing main body 1 and the base 5 can be obtained.

Figure 3 shows electrical equipment (not shown) housed in an airtight container 6.
A sealing main body 1 forming an insulated terminal conductor that conducts electricity to the electrical equipment, a sealing member 2 together with an annular member 4b having a conduit 8 attached to the inner peripheral surface of the flange 7 for introducing and discharging a refrigerant for cooling the electrical equipment. This figure shows another embodiment of the present invention, which is hermetically sealed at once. By providing the collar member 4a on the circumferential surface of the sealing main body 1 and the conduit 8 and flange 7, which are the other sealing main bodies, as described above, even a large object can be easily and reliably hermetically sealed. Alternatively, the flange 7 may be welded or tightened to the opening of the airtight container 6 later. Further, if it is necessary to prevent corona discharge from the tips of the collar member 4a and the annular member 4b, this can be easily prevented by rounding each tip as shown in FIG. As explained above, the present invention includes an L-shaped stress absorbing member that extends in a radial direction on a predetermined circumferential surface of a sealing main body to be hermetically sealed, and that constitutes a portion that absorbs stress in the radial direction at least in part. At the same time, a bottomed annular member facing the stress absorbing member is provided on the periphery of the insertion hole of the base on which the sealing main body is attached, and both of these members are integrally sealed and closed with a sealing member. Therefore, the total surface area of the opposing bottomed members can be increased, thermal effects can be eliminated, and the sealing body can be completely hermetically sealed to the base, and it is simple, inexpensive, and reliable. A highly hermetic sealing device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing a conventional hermetic sealing device, FIG. 2 is a sectional view of a main part showing an embodiment of the present invention, and FIGS. 3 and 4 are other embodiments of the present invention. FIG. 1: Sealing main body, 2: Sealing member, 4a: Flange member, 4b:
Annular member 5: Base, Figures The same reference numerals and symbols in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A bottomed annular member is provided along the periphery of the base opening, and a bottomed annular member is provided at the periphery of the sealing body inserted into the opening to absorb thermal stress generated in the sealing body. A hermetic sealing device characterized in that an annular flange member is fixed to the annular member in opposition to the annular member, and the opening is hermetically closed together with both members using a thermosetting resin. 2. The hermetic sealing device according to claim 1, wherein the annular member and the flange member have an L-shaped cross section and are arranged so that their tips are fitted with a predetermined gap between them. . 3. The hermetic sealing device according to claim 1, wherein the annular member and the collar member have rounded tips.