JPS6057287B2 - Electrical equipment container connection device and method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device and method for connecting containers of electrical equipment,
The object of the present invention is to provide an apparatus and a method for welding flanges of a container together, which reduce the thermal influence on a thermally degradable member interposed between the flanges.

It is constructed by filling an insulating medium such as gas or insulating oil.

Therefore, such electrical equipment may be used by connecting other gas-insulated, oil-insulated, or air-insulated electrical equipment, and in such cases, the connected parts may also be insulated with insulating gas, insulating oil, etc. Generally, it is filled with an insulating medium to reduce the size.
Examples of the electrical equipment include Shiya Shinsei, switches, transformers, capacitors, reactors, generators, synchronous phase modifiers, overhead power transmission lines, cables, and the like.

The connection between the electric devices is, for example, in a gas-insulated switchgear, as shown in FIG. This is done by fastening them with bolts and nuts 7.

By the way, when connecting gas-insulated switchgear, there are cases where the distance between the first and second circuits is long, when gas insulation is provided between the generator and the primary transformer, or when gas-insulated switchgear and oil-immersed transformer are connected. When the dimensions between electrical equipment are long, such as when connecting a transformer for a suction instrument or a suction instrument transformer, or when providing gas insulation between a gas insulated switchgear and an overhead power transmission line, as shown in Figure 1, Both devices 1 and 2 with an auxiliary container 8 interposed
Connections may be made. In addition, if the above dimensions are longer, a plurality of auxiliary containers each having a unit length are sequentially connected to secure the predetermined dimensions. Therefore, this auxiliary container 8
and container 4 are flanges 9 and 10 provided respectively.
Generally, the connection is made by joining them together and forming a welded part 11 at the end thereof.

This will be explained based on FIG. In the same figure, 8,
4 is a cylindrical container, 9 and 10 are flanges thereof, 11 is a welded part where the tips of flanges 9 and 10 are hermetically welded along the circumference, 12 is a high voltage bus conductor, and 13 is filled after assembly and testing are completed. SF6 Ga. Highly insulating media such as In addition, in order to check for gas leakage from this welding part 11 and to prevent foreign matter such as welding spatter and dust from entering the containers 8 and 4 during welding, O-rings are attached to the joint surfaces of the flanges 9 and 10. things will be done.

However, as shown in FIG. 3, if the O-ring 15 is attached directly to the joint surface 14 of the flanges 9 and 10, the welding part 11 and the O-ring 15 are too close to each other, and the O-ring 15 is thermally deteriorated by the welding heat. That function is lost.

Therefore, the material of the O-ring 15 is made of a heat-resistant material such as fluororubber, and as shown in FIG. 4, a structure is adopted in which the welded portion 11 and the mounting position of the O-ring 15 are separated from each other by a large distance.
Note that 16 is a communication hole between the welded portion 11 and the O-ring 15 for airtightness testing. Therefore, in the conventional one, the flanges 9,
10 becomes larger in the thickness direction, and O-ring 1
5 was also unreasonable in terms of manufacturing, handling, and cost, as it required the selection of special materials such as fluororubber.

In view of the above points, the present invention includes welded parts, O-rings, etc. A space is provided between the heat-degradable member and the heat-degradable member to reduce the effect of heat during welding. The present invention will be explained below based on FIG.

In the figure, 17 crosses the joint surface 14 of the flanges 9 and 10 between the O-ring 18 and the welded part 11! It is a vacant room with a lot of space. And this empty space 17 is the flange 9,1
It is provided in an annular shape along the circumferential direction of 0. Otherwise, the same reference numerals as in FIG. 4 indicate the same or corresponding parts. To connect the containers 8 and 4 in this configuration, one flange 10
An O-ring 18 is attached to the flange 9 and 10, and both flanges 9 and 10 are pressed together.

Then, the tips of the joint surfaces 14 of both flanges 9 and 10 are welded along the circumference to form a welded portion 11. After welding is completed, vacuum is drawn from the communication hole 16, and the welded part 11 and O
The ring 18 is tested for airtightness. If this test is passed, the communication hole 16 is covered with a blind cover and sealed by welding or the like.
When the above-mentioned cavity 17 is provided, the heat conduction distance between the welding part 11 and the O-ring 18 becomes significantly longer, making it difficult for the heat to be transferred during welding. This makes it possible to use an inexpensive standard product such as rubber instead of a special specification product.

Moreover, the welding spatter remains in the cavity, and if this connection is later disconnected for some reason, a large amount of the spatter will not be scattered into the containers 4, 8. FIG. 6 shows another embodiment of the invention in which flanges 9 and 10 are fitted together.

FIG. 7 shows still another embodiment of the present invention, in which flanges 9, 10
The joint surfaces 14a and 14b are shown in different levels with the empty chamber 17 as a boundary.

According to this configuration, when welding spatter falls during welding of the tips of the flanges 9 and 10, even if there is a gap between the joint surfaces 14b of the flanges 9 and 10, it is temporarily caught at the uneven part and directly contacts the O-ring 18. Never.

Moreover, even though the joint surfaces of the flanges 9 and 10 are at different levels, there is a cavity 17, so even if the central axes of both flanges 9 and 10 do not coincide, this can be absorbed by the cavity and the connection can be made. It becomes like this. FIG. 8 shows still another embodiment of the present invention, in which an insulating spacer 19 for a gas compartment or for supporting a high-voltage bus conductor is provided between flanges 9 and 10, and O-rings 18 and 18 are provided between flanges 9 and 10, respectively. I am intervening.

As is well known, this type of insulating spacer 19 is mainly composed of epoxy resin and is subjected to gas-resistant treatment, but it is a thermally degradable member and may deteriorate in quality due to the influence of heat during welding. However, according to the present invention, such fear is eliminated. FIG. 9 is for explaining the connection method of the present invention.
The vacant room 17 has a plurality of communication holes 16a, 16b leading to the outside.
is provided.

Otherwise, the same reference numerals as in FIG. 7 indicate the same or corresponding parts. Next, the connection method of the present invention will be explained with reference to this figure.

First, an O-ring 18 is attached to one flange 10, and both flanges 9 and 10 are pressed together.

Next, a hose is connected to one of the communication holes 16a via an adapter or the like, and the empty chamber 17 is evacuated.

Then, air flows in from the other communication hole 16b and fills the empty chamber 1.
This means that new air is constantly circulating inside 7.
In this state, the tips of the joint surfaces of the flanges 9 and 10 are welded.

For the airtight test, one communicating hole, for example 16a, is left, and the others are covered with blind covers and sealed by welding.

Then, the remaining communication hole 16a is evacuated and the welded portion 11 and O-ring 18 are tested for airtightness. After confirming that there is no problem, this communication hole 16a is also covered with a blind cover and sealed by welding. In this way, containers 8, 4
The welding heat when connecting O-ring 1 is
Since the distance to the O-ring 18 is long, it is difficult to reach the O-ring 18, and furthermore, due to the heat dissipation effect based on the cooling air flowing in the cavity 17, the thermal influence on the O-ring 18 is significantly reduced.

Therefore, the flanges 9, 1 compared to those in FIGS.
0 can be made even smaller, and there is no need to use a special heat-resistant material such as fluororubber for the material of the 0 ring 18.

If a vacuum is drawn from the communication hole 16a, the joint surface 14
Since no gas is blown out from a, the flanges 9 and 10 can be easily joined together. Note that instead of drawing a vacuum through the communication hole 16a during welding, compressed air may be supplied and discharged from the communication hole 16b.

Also, the gas flow supplied to the empty chamber 17 is SF6 instead of air.
It can also be a high performance cooling gas such as gas.

In this case, it is advantageous to recover and reuse the gas. The above describes a case in which the present invention is applied to a connecting part between electrical devices that are gas insulated, but even if it is a connecting part between two electrical devices that are insulated with oil, there are two types: one that is oil insulated and one that is gas insulated. The present invention can be similarly applied to a connection between a gas-insulated object and an air-insulated object.

Furthermore, as described above, the present invention can be applied to the connection of auxiliary containers without any problem.

Furthermore, the present invention can be applied to a device that does not use a fastening flange that is fastened with bolts or nuts, as described above.

As detailed above, when using the apparatus of the present invention, since the distance between the welding part and the thermally degradable member is increased by providing a vacant chamber, the thermal influence on the latter can be reduced during welding, and the flange The dimensions of can be reduced.

Furthermore, when using the method of the present invention, the tips of the joint surfaces of the end flanges are welded while gas is flowing through the empty chambers, so that the thermal influence on the thermally degradable member can be further reduced, and the dimensions of the end flanges can be further reduced. This has the effect that the length can be further shortened.

[Brief explanation of the drawing]

Figure 1 is a side view showing a conventional electrical equipment connection device;
The figures are an enlarged sectional view of the connecting device shown in FIG. 1, FIG. 3 is a vertical sectional view showing a commonly considered connecting device, FIG. 4 is a vertical sectional view showing a conventional connecting device, and FIGS. The figures are longitudinal cross-sectional views showing different embodiments of the connecting device of the present invention, FIG. 9 is for explaining the connecting method of the present invention, a is a seventh vertical cross-sectional view of the connecting device, and b is a (7) It is a cross-sectional view along line bb. 4, 8... Container, 9, 10... Flange, 11...
・Connection part, 14...Joint surface, 16...Communication hole, 17
...Vacancy, 18...O ring, 19...Insulating spacer.

Claims (1)

[Scope of Claims] 1. A heat-degradable member is interposed between the flanges of a container, and the tips of the flanges are welded and sealed together, wherein the flange is joined between the tip of the flange and the heat-degradable member. An electrical equipment container connection device formed by forming a cavity that crosses the surface. 2. The electrical equipment container connection device according to claim 1, wherein the joint portions are configured in different stages on both sides of the space. 3 A heat-degradable member is interposed between the flanges of the container, a cavity is formed between the heat-degradable member and the tip of the flange, and a cavity is formed across the joint surface of the flange, and while gas is flowing through the cavity, A method for connecting a container of an electrical device, in which the tips of the flanges are welded together. 4. A method for connecting a container of an electrical device according to claim 3, wherein gas is circulated in the cavity by discharging the gas in the cavity.