JPS6124887B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a closed container for housing, for example, gas insulated equipment.

In recent years, reduced-sized gas-insulated switchgear has come into widespread use due to land issues and environmental measures. The use of electrical circuits is also on the rise. These are insulated with the same SF ₆ gas and can have the same gas pressure, making connection very easy. Furthermore, since it is suitable for carrying large currents, it is being used in parts of power transmission lines. Construction is also carried out in a variety of ways, including above ground, on a trestle, in a trench, in a tunnel, or directly buried.

In order to economically install cables over such a wide area and over considerable distances, it is appropriate to manufacture units as long as possible within the transport restrictions in a factory, and then weld and connect the outer shells of the units on-site. There is.

On the other hand, the insulation performance of gas insulated equipment generally decreases when foreign matter such as metal powder is mixed into the gas, resulting in
% may also be affected, so it is assembled with great care in a dust-proof room.

Therefore, it is necessary to prevent foreign matter from entering even when welding on site.

Conventional airtight containers include heat-resistant rubber-like gaskets with abutting portions at both ends facing each other to allow ventilation.
The welded part is surrounded by the pad that is in contact with this packing, and the welded part is welded by cutting the welded part and the inside of the container. However, there was a drawback that the gas in the surrounding area expanded due to the welding heat and the pressure increased, which could have an adverse effect on the welded area.

This invention was made in order to eliminate the above-mentioned drawbacks, and by coating the abutting part with a dustproof material that has heat resistance and air permeability and can prevent particles exceeding a predetermined size, It is an object of the present invention to provide a closed container that can prevent spatter from entering the container.

The figures will be explained below. In Figs. 1 to 8, 1 and 2 are cylindrical outer jackets made of aluminum or the like and arranged so that welded parts 1a and 2a facing each other are welded together, and 3 is the welded part. 1a and 2a are pads that are placed inside the outer covers 1 and 2 facing each other, and have grooves 3a and 3 on the outer periphery of both ends.
b, and the outer periphery is sloped from the center to both ends to facilitate insertion of the outer covers 1 and 2. Reference numeral 4 denotes a heat-resistant rubber gasket having a ring shape and disposed within the grooves 3a and 3b, and is provided with contact portions 4a and 4b facing each other at a predetermined interval. In addition, both gaskets 4, 4 have welded parts 1a, 2.
They are arranged on both sides of a so as to surround the welded parts 1a and 2a. 5 is a dustproof material made of glass fiber having heat resistance and air permeability, and covers the gasket 4. Note that the dustproof material 5 may be made of a metal mesh pipe or the like as long as it can block particles exceeding a predetermined size. Reference numerals 6 and 7 are conductors disposed within the outer sheaths 1 and 2, 8 is a supporting member that supports the conductor 6, and 9 is a sliding contact, which is connected to both the conductors 6 and 7.
connecting between. Reference numeral 10 denotes an electrode for alleviating the electric field that covers the sliding contact 9.

In the above configuration, the pad 3 is temporarily welded to the outer sheath 1 in advance, and the outer sheath 2 is inserted on-site and the welded parts 1a and 2a are welded, and the inside is heated with 3 to 4 kg/cm ² .
Filled with _SF6 gas. In this case, the packing 4 prevents spatter during welding from entering the outer sheaths 1 and 2, and the dustproof material 5
to prevent damage from spatter. In addition, the gas in the area surrounded by the packing 4 expands due to welding heat, but it moves through the dustproof material 5 at the abutting parts 4a and 4b of the packing 4, so that the gas in the part surrounded by the packing 4 and the welding Since pressure increase in the welded parts 1a and 2a can be prevented, adverse effects such as gas entering the welded parts 1a and 2a and formation of blowholes can be eliminated.

In addition, as shown in FIG.
1 further facilitates the movement of the expanded gas.

Further, FIG. 4 shows another embodiment of the present invention, and in FIG. 2, if the distance from the welded parts 1a, 2a to the packing 4 is long to some extent, the packing 4 is less likely to be damaged by spatter. ,
Similar effects can be expected even if the dustproof material 12 is provided only near the contact portions 4a and 4b of the packing 4 as shown in the figure.

Furthermore, FIG. 5 shows another embodiment of the present invention, in which the same effect can be expected even if the pad 13 is arranged to face the outer periphery of the outer sheaths 1 and 2 and surround the welded parts 1a and 2a.

According to this invention, it has heat resistance and breathability,
And by covering the contact part of the packing with a dustproof material that can block particles exceeding a predetermined size,
It is possible to prevent spatter during welding from entering the container, and to facilitate the movement of gas, thereby preventing adverse effects during welding.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. FIG. 4 is a sectional view showing a main part of another embodiment of the invention, and FIG. 5 is a sectional view showing still another embodiment of the invention. In the figure, 1a and 2a are welded parts, 3 is a filler, 4 is a packing, 4a and 4b are abutting parts, and 5
is a dustproof material. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A heat-resistant rubber gasket is formed into a ring shape with the abutting portions at both ends facing each other in a ventilated manner, and a pad is brought into contact with the gasket to surround the welded portion, thereby sealing the welded portion and the inside. A seal obtained by cutting the welded part and welding the welded part, characterized in that the abutting part is covered with a dustproof material that has heat resistance and air permeability and can block particles exceeding a predetermined size. container.