JP2000184531A - Hermetic container for gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of mold cavities and defective air tightness by welding a barrel part of an aluminum casting and a flange part made of aluminum rolled material. SOLUTION: A cross-shaped barrel part 1 is made of an aluminum casting, and a flange part 2 is made of aluminum rolled material. The barrel part 1 and the flange part 2 are welded to constitute a hermetic container for gas- insulated switchgears. Incidentally, the barrel part 1 is not restricted to a cross- shaped one. Since the flange part 2 having surfaces which are required to be hermetic is made of the aluminum rolled material, and the barrel part 1 is made of the aluminum casting in this way, defective air tightness caused by mold cavities is not generated, and it becomes possible to perform manufacture at a low cost with an excellent yield rate without producing any defective product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airtight container for a gas insulated switchgear, which is formed by welding a body portion and a flange portion which needs airtightness.

[0002]

2. Description of the Related Art A conventional airtight container for a gas insulated switchgear is:
For example, as shown in FIG. 3, a cross-shaped body portion 1 made of a steel plate or an aluminum material and a flange portion 2 are welded, and the surface of the flange portion 2 that needs to be air-tight is sealed to the air-tight surface of the flange portion of another airtight container. Joined and connected.

[0003] Whether to use a steel plate or an aluminum material for the body portion 1 and the flange portion 2 is determined mainly by the rated current of the conductor housed in the container. That is, when the rated current is large, an eddy current is generated in the container by the magnetic flux generated by the current, and the temperature rise of the container increases. For this reason, an aluminum container is often used for one having a large rated current.

However, a container in which the body portion 1 and the flange portion 2 are made of aluminum and welded has a higher manufacturing cost than a container made of a steel plate, so that the cost of the entire gas insulated switchgear is increased.

[0005] For this reason, as shown in FIG. 4, a relatively large number of containers used as a standard often have a body portion 1 and a flange portion 2 integrally formed of an aluminum casting.

[0006]

In a conventional container in which the body portion 1 and the flange portion 2 are made of an aluminum casting, the surface of the flange portion 2 that needs to be air-tight is finished by machining after the casting is manufactured. The problem of the cavities is fateful. That is, if there is a cavity in the cut surface during machining, particularly the surface of the flange portion 2 that requires airtightness, the casting, that is, the container becomes unusable, and the yield is poor.

[0007] The above-mentioned cavities cannot be determined unless there is any cavities unless they are cut. If such cavities appear in the final stage of the cutting process, the processing up to that point is wasted and the cost is increased. .

An object of the present invention is to provide an inexpensive hermetic container for a gas insulated switchgear which has a good yield and has no possibility of poor airtightness due to a cavity, taking the above points into consideration.

[0009]

In order to achieve the above object, an airtight container for a gas insulated switchgear of the present invention is constructed by welding a body portion made of aluminum casting and a flange portion made of rolled aluminum material. It was done.

That is, a flange portion that requires an airtight surface where a casting cavity must never exist is made of rolled aluminum material, a body portion is made of aluminum casting, and the body portion and the flange portion are welded to form a container. Because of the configuration, there is no possibility of poor airtightness due to the cavities, no defective products due to the cavities are generated, and the yield is good and the cost is low.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The cruciform body 1 is made of aluminum casting, the flange 2 is made of rolled aluminum,
The body portion 1 and the flange portion 2 are welded to form an airtight container for a gas insulated switchgear.

In the case of the above-described embodiment, since the flange portion 2 having a surface requiring airtightness is made of rolled aluminum material and the body portion 1 is made of aluminum casting, poor airtightness due to cast cavities does not occur, and the defective product is not produced. Does not occur, and the yield is good and the cost is low. It is needless to say that the form of the trunk portion 1 is not limited to the illustrated cross shape.

[0013]

The airtight container for a gas insulated switchgear of the present invention is constructed as described above, and has the following effects. Since the flange portion 2 requiring an airtight surface is made of rolled aluminum, the body portion 1 is made of aluminum casting, and the body portion 1 and the flange portion 2 are welded to form an airtight container. Unlike the conventional case, there is no possibility of poor airtightness due to the cavities, there is no defective product due to the cavities, the yield is good, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a sectional view of a conventional example.

FIG. 4 is a sectional view of another conventional example.

[Explanation of symbols]

 1 body part 2 flange part

Claims (1)

[Claims] An airtight container for a gas insulated switchgear, wherein a body portion made of aluminum casting and a flange portion made of rolled aluminum material are welded.