JPS582018Y2 - 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 an oil-filled electrical appliance, and more particularly to an improvement in an exhaust connection structure provided at the connection between the pressure relief device and the drain oil tank.

Generally, oil-filled electrical equipment is equipped with a pressure relief device to alleviate the rise in internal pressure in the event of an accident.

In recent years, from the perspective of disaster prevention, as shown in Figure 1, in order to prevent the oil from the pressure relief device from scattering around when the pressure is released in the event of an accident,
A structure is adopted in which a pressure relief device 2 of an oil-filled electric appliance 1 is connected to an oil drain tank 4 via an oil drain pipe 3.

In the case of this structure, when releasing oil, it is necessary to exhaust gas such as air containing decomposed gas of oil in the drain oil tank 4 to the outside, and the connection part 5 between the drain oil pipe 3 and the drain oil tank 4 must be connected. First, an exhaust hole is provided.

As shown in detail in FIG. 2, the drain oil pipe 3 that communicates with the pressure relief device 2 is open at its lower end, while the relatively short pipe 7.6 that communicates with and is fixed to the drain oil tank 14 is connected to the drain oil tank 14. The oil drain pipe 3 is opened at the upper end and inserted into the iron pipe 6 so that its lower end has an appropriate gap with the upper end of the pipe 6, and the upper end of the pipe 6 is attached to the lower end outside the lower end of the oil drain pipe 3. It is surrounded by an open cylindrical body 7 with an appropriate gap.

In this way, the oil drain pipe 3 whose diameter gradually increases by one predetermined dimension
, the pipe 6 and the cylindrical body 7 together with the upper plate 4A of the oil drain pipe 4 form a bent exhaust hole 8 as shown in the figure.

Therefore, gas is exhausted as indicated by arrow A when the oil is released.

On the other hand, in the connecting portion 5, the drain oil pipe 3 is not directly connected to the pipe 6 or the drain oil tank 4, but is separated by the exhaust hole 5 as described above.

Therefore, as shown in FIG. 1, the exhaust pipe 3 is supported and fixed to the oil-filled electrical appliance 1 via a support member 9.

However, such conventional structure has the following drawbacks.

First, in the case where the oil-filled electrical appliance 1 is surrounded by a radiator (not shown), etc., there is no room for installing the support 9, and the installation of the support 9 may actually get in the way of installing the radiator, etc. It ends up.

Furthermore, when inserting the oil drain pipe 3 into the pipe 6, it is necessary to support and fix the oil drain pipe 3 with the support member 9 while adjusting the vertical dimension or front/back/horizontal dimension in order to form the exhaust hole 8. The work involved is complicated.

Therefore, the present invention was devised based on a novel idea with the aim of providing a pressure relief device for oil-filled electrical appliances that eliminates the drawbacks of the above-mentioned conventional technology. The lower end of the oil drain pipe extends from the pressure relief device, and the lower end of the oil drain pipe is opened at the lower end so that there is a gap between the outer peripheral surface of the lower end of the pipe and the inner peripheral surface of the pipe that communicates with the oil drain tank and whose upper end is open. In the case where the pipe is inserted into at least the upper end of the pipe, a plurality of studs are installed surrounding the iron pipe on the upper plate of the drain oil tank with which the pipe is communicated and fixed, or on the lower flange attached to the iron pipe. A short pipe that surrounds the upper end of the pipe with a gap inside the stud is fixed to the upper flange, which has a mounting hole for the stud and an insertion hole for the oil drain pipe in the center, and the upper flange is fixed. The oil drain pipe is screwed onto the stud and inserted into the insertion hole of the upper 7 langes.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 3a and 3) and FIG. 4.

Note that the same parts as those in the prior art shown in FIGS. 1 and 2 are given the same reference numerals and redundant explanations will be omitted.

Figures 3a and 3l) show the main parts of the - embodiment.

As shown in the figure, a plurality of studs 10 are circumferentially installed around the iron pipe 6 on the upper plate 4A of the drain oil tank 4, to which the pipe 6 is communicated and fixed.

The lower end of the oil drain pipe 3 is inserted into the pipe 6 with a gap, and the oil drain pipe 3 itself is inserted into the insertion hole 13 of the upper flange 11 screwed onto the stud 10 with a nut 15.

In this case, the upper flange 11 has a short tube 12 on its lower side, which surrounds the upper end of the tube 6 inside the stud 10 with a gap.

That is, the upper flange 11 is provided with a mounting hole 14 on the outer periphery into which the stud 10 can be inserted, and an insertion hole 13 in the center into which the oil drain pipe 3 can be inserted. The short pipe 12 has a larger diameter than the pipe 6 by a predetermined dimension, and a smaller diameter than the circumferential diameter of the attachment hole 14.

Further, the connection work will be described with reference to FIG.

First, align the mounting hole 14 of the upper flange 11 with the stud 10, attach the upper flange 11 to the stud 10 from above (arrow B), and tighten the nut 15 at the position where the exhaust hole 8 is to be formed.
Fix it by.

Thereafter, the oil drain pipe 3 is inserted into the insertion hole 13 of the upper flange 11 while hanging it (arrow B).

In this case, the oil drain pipe 3 is inserted until its lower end overlaps at least the upper end of the pipe 6, and the vertical dimensions are adjusted so that the oil drain pipe 3
is supported and fixed by, for example, welding to the upper flange 11.

Note that the arrow A1 in FIG. 3a indicates the flow of gas.

Next, another embodiment will be explained based on FIG. 4 showing the main part thereof.

As shown in the figure, in this case, the pipe 6A that communicates with and is fixed to the oil drain tank is an oil drain pipe that is longer than the pipe 6 and similar to the oil drain pipe 3, and its end is swollen to have a larger diameter than the oil drain pipe 3. The shape of the cup portion 6B is the same.

Of course, the cup portion 6B may be formed by connecting another short pipe having a larger diameter than the oil drain pipe 3.

Further, in order to support and fix the upper flange 11, a lower flange 16 is attached to the cup portion 6B, and a stud 10 is installed in this lower flange 16.

Therefore, for the embodiment shown in FIGS. 3a and 3), the pipe 6 is
Other studs 10, upper flange 11.
Although the short pipe 12 and the like are the same, the connection work is also the same.

Note that arrow A2 indicates the flow of gas.

By the way, regarding the exhaust hole 8, insects and the like may enter the exhaust hole 8.

Therefore, it is preferable that the gap between the upper short pipe 12 and the upper plate 4A or between the short pipe 12 and the lower flange 16 be as narrow as possible.

Therefore, in order to narrow the gap without blocking the gas flow, it is possible to drill many small through holes in the short tube 12 and bring the lower end of the short tube 12 into contact with or very close to the upper plate 4A or the lower flange 16. Effective.

As described above in detail with the embodiments, according to the present invention, the oil drain pipe can be supported and fixed to the oil drain tank via the stud provided for drain oil inspection and the upper flange. There is no need to support and fix the pipe with material, and even if the oil-filled electrical appliance is covered with a radiator, etc., the oil drain pipe can be fixed freely without having to worry about selecting the part to attach the support material or the part to attach the radiator, etc.

Furthermore, the insertion position of the oil drain pipe is automatically determined by simply fixing the upper flange to the stud, so there is no need for centering adjustment work between the oil drain pipes.

In addition, the vertical dimensions of the oil drain pipe can be easily adjusted by sliding the oil drain pipe up and down within the insertion hole.However, even if the oil drain pipe is slightly tilted due to the installation location of the pressure relief device, etc., the studs on the upper flange can be easily adjusted. It can be easily supported and fixed by simply adjusting the mounting position with a nut.

[Brief explanation of drawings]

1 and 2 relate to the prior art; FIG. 1 is a side view showing the oil-filled electric appliance and the pressure relief device as a whole, and FIG. 2 is a sectional view showing the vicinity of the connecting portion of the pressure relief device. Figures 3 and 4 relate to the embodiment of the present invention, and Figure 3a is -
FIG.
FIG. 4 is an exploded sectional view showing the connection work, and FIG. 4 is a sectional view showing the vicinity of the connecting portion, which is the main part of another embodiment. In the drawing, 1 is an oil-filled electrical appliance, 2 is a pressure relief device, 3 is an oil drain pipe, 4 is an oil drain tank, 4A is an upper plate, 6, 6A are pipes, 6B is a cup part,
8 is an exhaust hole, 10 is a stud, 11 is an upper flange, 1
2 is a short tube, 13 is an insertion hole, 14 is a mounting hole, 15 is a nut, and 16 is a lower flange.

Claims (1)

[Scope of utility model registration request] The lower end of the oil drain pipe is arranged such that there is a gap between the outer peripheral surface of the lower end of the oil drain pipe that extends from the pressure relief device of the oil-filled appliance and whose lower end is open, and the inner peripheral surface of the pipe that communicates with the oil drain tank and whose upper end is open. In the case where the pipe is inserted into at least the upper end of the pipe, a plurality of studs are planted around the pipe on the upper plate of the oil drain tank with which the pipe communicates and is fixed, or on the lower flange attached to the iron pipe. On the other hand, a short pipe that surrounds the upper end of the pipe with a gap inside the stud is fixed to the upper flange, which has a mounting hole for the stud on the outer periphery and an insertion hole for the oil drain pipe in the center, 1. A pressure relief device for an oil-filled electrical appliance, characterized in that an upper flange is screwed onto a stud, and the oil drain pipe is inserted into an insertion hole of the upper flange.