JPS582019Y2 - Pressure relief device for oil-filled appliances - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pressure relief device for oil-filled electric appliances such as oil-immersed transformers, and more specifically, the connection between the oil drain pipe extending from the pressure relief device and the pipe communicating with the oil drain tank. This is an improved structure of .

In order to prevent secondary disasters caused by internal accidents in oil-filled electrical appliances such as oil-immersed transformers, these oil-filled appliances were first equipped with pressure relievers, but in recent years they have also been equipped with pressure relievers, as shown in Figure 1a. As such, the pressure reliever 2 of the oil-filled electric appliance 1 is connected to the oil drain tank 5 via the oil drain pipe 3 and the pipe 4 so as to prevent sprayed oil caused by pressure relief in the event of an accident from scattering around.

In addition, considering the phenomenon of generation of cracked gas due to oil spouting when such a structure is adopted, the oil drain tank 5 in the event of oil spouting is
An exhaust hole is always provided in the connection part 6 between the drain oil pipe 3 and the pipe 4 in order to exhaust gas such as air inside to the outside.

The details of this connecting portion 6 are shown in FIG.

As shown in FIG. 1, conventionally, the short pipe 4 has been fixed to the opening of the upper plate 5a of the oil drain tank 5 with its lower end facing into the drain oil tank 5 and its upper end open. be.

On the other hand, the oil drain pipe 3 extending from the pressure relief device 2 is open at its lower end, and a gap is interposed between the outer peripheral surface of the lower end and the inner peripheral surface of the upper end of the pipe 4. It should be inserted into the upper end of the

The upper end of the cylindrical body 7 is fixed to a flange part 8 fixed to the lower part of the oil drain pipe 3 so that the lower end thereof is open while surrounding the pipe 4.

In other words, the cylindrical body 7 and the flange portion 8 form a lid for the gap formed by the oil drain pipe 3 and the pipe 4 as described above.
This gap, the gap formed between the upper end of the tube 4 and the lower surface of the flange portion 8, and the gap formed between the outer circumferential surface of the tube 4 and the inner circumferential surface of the cylindrical body 7 form an exhaust hole 9 which is bent.

Therefore, in this prior art, the oil drain pipe 3 is connected to the oil drain tank 5.
In other words, the weight of the oil drain pipe 3 is not supported by the oil drain tank 5.
As shown in FIG. 2, the oil drain pipe 3 hanging down toward the oil drain tank 5 is supported by fixing the other end of a support member 10, one end of which is fixed to the tank 1a of the oil-filled electric appliance 1.

However, there have been many cases where the presence of the support member 10 becomes a nuisance, including when it is necessary to install a radiator or the like around the tank 1a.

Therefore, in view of the above-mentioned conventional technology, the present invention has been devised to provide an oil tank having a support part with a simple structure that does not impair the exhaust function at the joint between the oil drain pipe and the pipe and does not interfere with the installation of a radiator. The purpose is to provide a pressure relief device for electrical appliances, and its configuration consists of an inner peripheral surface of the upper end of a pipe that communicates with an oil drain tank and whose upper end is open, and a lower end of an oil drain pipe that extends from the pressure relief device and whose lower end is open. The lower end of the oil drain pipe is inserted into the upper end of the pipe with a gap interposed between the pipe and the outer peripheral surface of the pipe. The lower end is fixed to the upper plate of the oil drain tank or the flange fixed to the pipe, and the upper end of the cylindrical body is fixed to the flange fixed to the oil drain pipe.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, with the same numbers assigned to the same parts as those of the prior art.

Figure 2 a, l) shows the oil drain pipe 3 and pipe 4, which are the main parts of this embodiment.
FIG.

As shown in FIG. 2 a, l), the oil drain pipe 3 is
As in the past, it extends from the pressure relief device and its lower end is the drain oil tank 5.
The lower end is inserted into the iron pipe 4 so that there is a gap between the outer peripheral surface and the inner peripheral surface of the pipe 4.

On the other hand, the cylindrical body 11 having a large number of small holes 11a is connected to the tube 4.
and its lower end is the upper plate 5a of the drain oil tank 5.
The upper end thereof is fixed to a flange portion 12 fixed to the lower part of the oil drain pipe 3.

Therefore, the connecting portion 13 of this embodiment includes a gap formed between the outer peripheral surface of the oil drain pipe 3 and the inner peripheral surface of the pipe 4, a gap formed between the upper end of the pipe 4 and the lower surface of the flange portion 12, and a gap formed between the outer peripheral surface of the pipe 4. and the inner peripheral surface of the cylindrical body 11 through the gap formed by the small hole 11.
An exhaust hole 14 is formed which exits through the hole a.

As a result, gas such as air in the drain oil tank 5 is discharged to the outside through the exhaust hole 14.

The route at this time is shown by an arrow in FIG. 2a.

On the other hand, the oil drain pipe 3 is connected to the upper plate 5a of the oil drain tank 5 through the cylindrical body 11.
is supported.

FIG. 3 shows another embodiment of the present invention.

As shown in this embodiment, the pipe 15 fixed to the drain oil tank 5 similar to that of the previous embodiment has a longer dimension than the pipe 4 of the previous embodiment.

Therefore, the upper end of the pipe 15 into which the lower end of the oil drain pipe 3 is inserted has a relatively large diameter, and a flange 16 fixed to this upper end has a large number of small holes 11 similar to those in the previous embodiment. The lower end of the cylindrical body 11 with a is fixed.

Therefore, an exhaust hole 17 having the same function as the pressure relief device according to the embodiment described above is formed.

Moreover, the oil drain pipe 3 has a cylindrical body 11. Flange portion 16 and pipe 15
It is supported on the upper plate of the drain oil tank via.

As specifically explained above in conjunction with the embodiments, the present invention connects the oil drain pipe and the oil drain tank via the cylindrical body, so the oil drain pipe can be supported in a minimum space, and the area around the tank of the oil-filled electrical appliance can be It is possible to secure mounting space for a radiator, etc.

In addition, since the cylindrical body has a larger diameter than the pipe fixed to the oil drain tank and has a large number of small holes, it can not only effectively remove air and other gases from the oil drain tank, but also protect against small animals such as insects. It can also prevent the intrusion of

[Brief explanation of drawings]

Fig. 1a is an explanatory diagram showing a pressure relief device according to the prior art together with an oil-filled electric appliance, Fig. 1 is an enlarged vertical cross-sectional view of the main part thereof, and Fig. 2a is a main part of the embodiment of the present invention. A vertical cross-sectional view showing the part;
FIG. 2 is a side view thereof, and FIG. 3 is a longitudinal sectional view showing the main parts of another embodiment of the present invention. In the drawing, 3 is an oil drain pipe, 4 and 15 are pipes, 5 is an oil drain tank, and 5a
11 is an upper plate, 11 is a cylindrical body, 11a is a small hole, and 12.16 is a flange portion.

Claims (1)

[Scope of utility model registration request] A gap is interposed between the inner peripheral surface of the upper end of the pipe that communicates with the oil drain tank and whose upper end is open, and the outer peripheral surface of the lower end of the oil drain pipe that extends from the pressure relief device and whose lower end is open. The lower end of the tube is inserted into the upper end of the tube, and the tube is surrounded by a cylindrical body having a large number of small holes, and the lower end of the cylindrical body is connected to the upper plate of the oil drain tank or to a flange portion fixed to the tube. A pressure relief device for an oil-filled electrical appliance, characterized in that the upper end of the cylindrical body is fixed to a flange portion fixed to the oil drain pipe.