Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Reexamination Certificate
1994-03-15
2001-07-31
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
C174S030000, C174S09900B
Reexamination Certificate
active
06268562
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a sealed container and a method for assembling it and, more particularly, to a hermetically sealed connection part of a sealed container which is employed as a gas breaker or a gas-insulated switchgear which contains a high-voltage conductor or an electric power device in its inside.
Conventional types of hermetically sealed connection parts of gas-insulated switchgears or the like are disclosed in Japanese Patent Laid-Open Nos. 44313/1981 and 105154/1981. As disclosed, the sealed container of either of the gas-insulated switchgears in which high-voltage conductors are accommodated in an insulated state has the following arrangement: To retain the airtightness of the connection part, single or double grooves are respectively provided in flanges downwardly of bolt holes, and gaskets, such as O-rings, are fitted into the respective grooves to compress and deform the O-rings, whereby the resultant elastic repulsive forces are used to seal the connection part so that the internal pressurized SF
6
gas is prevented from leaking to the outside.
Further, to cope with corrosion of flange faces due to penetration of rainwater or the like, a liquid packing is injected under pressure through an injection opening which communicates with the inside of the flanges, thereby forming an annular gasket between the flanges to retain watertightness.
SUMMARY OF THE INVENTION
In a cold area or the like, there is the problem that rainwater penetrates into and freezes/melts in the gaps between connected flanges to cause cracking of an insulating spacer, or corrosion of a flange.
In the step of injecting a liquid packing under pressure, if the liquid packing is injected under pressure without carrying out the step of sealing the gaps between connected flanges and bolt portions, the liquid packing might leak through the gaps between the connected flanges or the bolt portions. This problem is not at all taken into account in either of the above-cited documents depicting the conventional technology.
A first object of the present invention is to provide a sealed container capable of preventing rainwater or the like from penetrating into the gaps between connected flanges.
A second object of the present invention is to improve the step of assembling a sealed container in which a liquid packing is employed between connected flanges.
The first object is achieved by providing an arrangement in which grooves are respectively provided in annular form inwardly and outwardly of inserting holes for flange fastening means, such as bolts which are disposed in annular form, wherein a sealing means, such as an O-ring, is disposed in each of the grooves.
The second object is achieved by providing an arrangement which includes an annular first groove formed in a flange connection face in such a manner as to have a flange-fastening-means inserting hole at its bottom, an annular second groove formed in the flange connection face outwardly of the flange-fastening-means inserting hole, a liquid packing injected into the first groove, and sealing means disposed in the second groove.
Since the sealing means is also disposed outwardly of the bolt holes, it is possible to prevent rainwater or the like from penetrating into the gaps between connected flanges with airtightness retained.
Further, since the sealing means is disposed outwardly of the bolt holes, it is possible to readily inject the liquid packing into the gaps between connected flanges. Particularly, by using a sealing washer, it is possible to more readily inject the liquid packing into the gaps between connected flanges.
REFERENCES:
patent: 767763 (1904-08-01), Reinvaldt
patent: 3291890 (1966-12-01), Sweeny et al.
patent: 3652778 (1972-03-01), Sakai
patent: 3858987 (1975-01-01), Kleinhans et al.
patent: 3930656 (1976-01-01), Jelinek
patent: 4067531 (1978-01-01), Sikula
patent: 4413166 (1983-11-01), Meyer
patent: 4549037 (1985-10-01), Bawa et al.
patent: 4730085 (1988-03-01), Hama et al.
patent: 4786761 (1988-11-01), Hama et al.
patent: 4842548 (1989-06-01), Bolante
patent: 5071140 (1991-12-01), Quevedo del Rio
patent: 56-44313 (1981-04-01), None
patent: 56-105154 (1981-08-01), None
patent: 5199635 (1993-08-01), None
Sakaguchi Minoru
Satou Hideaki
Yokoyama Koji
Hitachi , Ltd.
Mattingly Stanger & Malur, P.C.
Reichard Dean A.
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