JPH0451457Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a pressure relief device used in oil-filled electrical equipment such as large-capacity oil-filled transformers.

[Prior Art] Oil-filled electrical equipment in which the main body of the electrical equipment is housed together with insulating oil in a tank is provided with a pressure relief device to prevent the pressure in the tank from becoming excessive.

Generally, this type of pressure relief device includes a pressure relief section that is equipped with a pressure relief plate that breaks when the pressure inside the tank rises abnormally, and an oil guide pipe that guides the insulating oil released from the pressure relief section. However, in large-capacity electrical equipment, the oil guide pipe becomes quite large.

FIG. 3 shows a pressure relief device 1 used in conventional large-capacity oil-filled electrical equipment. A first pressure relief container 4 having a tubular shape, a second pressure relief container 5 having one end connected to the first pressure relief container 4, and a second pressure relief container 5 disposed between the first and second pressure relief containers. and an oil guide pipe 7 connected to the other end of the second pressure relief container 5. Although not shown, the first pressure relief container 4 is usually equipped with a needle that is driven by a pressure response mechanism such as a pressure relief valve, and when the needle causes an abnormal increase in the pressure in the tank of the electrical equipment, a pressure relief valve A mechanism for destroying the pressure is provided, and a pressure relief section 8 is constituted by the mechanism, the first and second pressure relief vessels 4 and 5, and the pressure relief plate 6.

When an accident occurs in the tank 2 of the oil-filled electrical equipment and the pressure inside the tank increases, the pressure release plate 6 breaks and releases the pressure inside the tank 2. At this time, a large amount of insulating oil is released outside the tank, so an oil guide pipe 7 is provided to prevent the insulating oil from scattering around.

The oil guide pipe 7 is arranged so as to extend vertically on the side of the tank 2, and is fixed to the side wall of the tank 2 with a fitting 9. A pressure relief section connecting flange 7a is provided at the upper end of the oil guide pipe 7, and the flange 7a is fitted to the lower end of the second pressure relief container 5 from the outside. The lower end of the oil guide pipe 7 is inserted into an oil reservoir pit 11 provided under the floor 10. The fitting 9 is a fitting 9A welded to the oil guide pipe 7.
and a fitting 9B welded to the tank 2 side, and the fittings 9A and 9B are connected to the bolt 9C.
The oil guide pipe 7 is fixed to the tank 2 by connecting the oil guide pipe 7 to the tank 2.

When installing the oil pipe 7, after fitting the upper end of the oil pipe 7 into the pressure relief part 8, align the fittings 9A and 9B of the mounting bracket 9 and tighten the bolt 9C. In electrical equipment, the oil guide pipe 7 is considerably large in size and has a large weight, and therefore, when installing the oil guide pipe 7, a truck, a crane, etc. are required to handle the oil guide pipe.

[Problems to be Solved by the Invention] In the above pressure relief device, when a pressure relief operation is performed, it is necessary to perform repair work to replace the pressure relief plate. Furthermore, even if the pressure relief operation is not performed, it is necessary to periodically inspect the vicinity of the pressure relief plate for cracks, oil leaks, etc. When performing these operations, it is necessary to remove and reinstall the oil guide pipe, but with conventional pressure relief devices, when installing and removing the oil guide pipe 7, a retcher or crane is used to remove and reinstall the oil guide pipe. The work was extremely troublesome because the whole thing had to be moved.

Further, the conventional oil guiding pipe 7 simply has its upper end at the pressure relief part 8.
Since the oil guide pipe was only fitted to the receptacle, when removing the oil guide pipe 7, if the oil guide pipe came off the receptacle, etc., the heavy oil guide pipe could fall or topple over, potentially injuring the worker. .

The purpose of this invention is to provide a pressure relief part with a built-in pressure relief plate,
Inspection of the pressure relief part in a pressure relief device for oil-filled electrical equipment that is fixed to the tank of the electrical equipment and includes an oil guide pipe that communicates with the pressure relief part to guide insulating oil released from the pressure relief part. To enable repair work to be easily performed without using a retoucher or the like, and to eliminate the possibility of an accident.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a pressure relief part connecting flange having an inner flange at one end, and the pressure relief part connecting flange is pressure relieved. A first relay pipe that is disposed so as to be fitted from the outside into the container of the section, and a first relay pipe that is inserted between the first relay pipe and one end of the oil guide pipe and separated into the first relay pipe and the oil guide pipe. a second relay pipe that can be connected to the pressure relief section, and a stopper that is fixed to the container of the pressure relief section and located closer to the oil guide pipe than the inner flange of the pressure relief section connecting flange, and the stopper is fixed to the container of the pressure relief section. It is provided so as to be movable between a locking position where the first relay pipe is locked by abutting against the inner flange of the pressure section connecting flange and a locking release position where the locking is released.

[Operation of the device] In the pressure relief device described above, when inspecting and repairing the pressure relief part, first check the gaps between the second relay pipe and the first relay pipe and between the second relay pipe and the oil guiding pipe. The second relay pipe is removed in a direction perpendicular to the axial direction of the oil guiding pipe. Next, the stopper is moved to the unlocking position and the first relay pipe is pulled out from the pressure relief section. In this state, a considerable space is formed between the pressure relief part and the oil guide pipe, so that the pressure relief plate can be replaced or the pressure relief part can be inspected without removing the oil guide pipe. The first and second relay pipes can be small enough to form a space between the pressure relief part and the oil guide pipe where inspection and repair of the pressure relief part can be carried out when both are removed. No cranes or cranes are required to handle the pipes. Therefore, inspection and repair work can be simplified, and since there is no need to handle heavy objects, work safety can be improved.

When carrying out inspection and repair work on the above pressure relief device, an operator who is familiar with the work procedure of conventional pressure relief devices accidentally accidentally bolted the oil guide pipe mounting bracket before removing the first and second relay pipes. However, in the present invention, since a stopper is provided to lock the first relay pipe, it is possible to accidentally remove the oil pipe fitting before removing the first and second relay pipes. It is possible to prevent the oil guide pipe from falling when it is removed, and it is possible to eliminate the possibility of an accident occurring.

[Embodiments] Examples of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an embodiment of the present invention. FIG. 1 shows the structure of the main part of the embodiment of the invention, and FIG. 2 shows its overall structure.

In this embodiment, the first pressure relief vessel 4 and the second pressure relief vessel 5 each having a cylindrical shape have flanges 4a and 5a at one end, and a pressure relief plate 6 is sandwiched between these flanges. It is. Annular packings 20 and 21 are inserted between the pressure relief plate 6 and the flange 4a and between the pressure relief plate 6 and the flange 5a, respectively. The flanges 4a and 5a are connected by bolts 22 provided at equal angular intervals and nuts 23 threaded onto the bolts.

A flange 4b (see FIG. 2) is provided at the other end of the first pressure relief vessel 4, and the flange 4b is connected to the tank 2 of the electrical equipment via the attachment pipe 3.

Although not shown, a destruction mechanism for destroying the pressure relief plate 6 when the pressure inside the tank 2 exceeds a predetermined value is housed in the first pressure relief container 4, and the destruction mechanism and the first and second A pressure relief section 8 is constituted by a pressure relief container and a pressure relief plate.

The oil guide pipe 7 is arranged to extend vertically on the side of the tank 2, and is fixed to the tank 2 via a fitting 9. The mounting bracket 9 is attached to the oil guide pipe 7.
It consists of a fitting 9A welded to the side wall of the tank 2 and a fitting 9B welded to the side wall of the tank 2.
and 9B are connected by bolts 9C.

One end (in this example, the upper end) of the oil guide pipe 7 is connected to a pressure relief part 8
The other end (lower end) of the oil guiding pipe 7 is arranged at a position separated from the second pressure relief vessel 5 by a predetermined distance.
It is inserted into an oil sump pit 11 provided under the floor surface 10.

A first relay pipe 25 and a second relay pipe 26 are arranged between the second pressure relief container 5 and the upper end of the oil guide pipe 7, and the pressure relief part 8 and the oil guide pipe 7 are connected via these relay pipes.
are connected.

The first relay pipe 25 has a pressure relief part connecting flange 25a and an external flange 25b at one end and the other end, respectively, each having an inner flange 25a ₁ and an outer flange 25a ₂ . is the second pressure relief vessel 5
It is placed in a state where it is fitted from the outside.

Flanges 26a and 26b are provided at one end and the other end of the second relay pipe 26, respectively, and the flange 26a abuts against the flange 25b of the first relay pipe 25 via a packing 27. The flange 26b of the second relay pipe 26 is in contact with the flange 7a provided at the upper end of the oil guide pipe 7 via a packing 28. Flanges 25b and 26a are bolts 2
9 and nuts 30, and the flange 26
b and 7a are fastened with bolts 31 and nuts 32.

A plurality of stopper mounting plates 33 are welded to the lower end of the second pressure relief vessel 5 at equal angular intervals in the circumferential direction, and bolts (hereinafter referred to as (referred to as a stopper) 34 are screwed together. Each stopper 34 is arranged closer to the oil guide pipe 7 (lower) than the inner flange of the pressure relief part connection flange, and by rotating each stopper and screwing it in the radial direction of the pressure relief container, the pressure relief Inner flange 25 of connection flange 25a
a ₁ to lock the first relay pipe 25, and a lock release position where the lock is released.

A ring-shaped packing holding plate 35 is also fitted around the outer periphery of the second pressure release container 5, and the packing holding plate 35 is connected to the first relay pipe 25 by bolts 36 and nuts 37. A tapered surface 35a is provided on the inner peripheral side of the packing press plate 35, and an annular packing 38 is sandwiched between the tapered surface 35a and the inner flange 25a ₁ of the pressure relief part connecting flange 25a. This packing is brought into close contact with the outer circumferential surface of the pressure relief container 5 by tightening the bolt 36, and the connection between the pressure relief container 5 and the first relay pipe 25 is made liquid-tight by the packing.

In the pressure relief device described above, when inspecting and repairing the pressure relief section 8, first loosen the bolt 36 and loosen the packing 38, and then 2 relay pipe 26 and oil guide pipe 7
The second relay pipe 26 is pulled out in a direction perpendicular to the axial direction of the oil guiding pipe 7. After that, the stopper 34 is moved back to the unlocking position, and the first
The relay pipe 25 is removed from the pressure release container 5 together with the packing press plate 35. In this state, a considerable space is formed between the pressure relief part 8 and the oil guide pipe 7, so it is possible to attach or detach the pressure relief vessel 5 without removing the oil guide pipe 7 to replace the pressure relief plate, or to replace the pressure relief plate. You can inspect the parts.

After the inspection and repair is completed, first the first relay pipe 2
5 is fitted into the pressure relief container 5 together with the packing press plate 35, and the stopper 34 is screwed to the locking position. Next, a second relay pipe 26 is inserted between the first relay pipe 25 and the oil guide pipe 7, and the second relay pipe is connected to the first relay pipe 25 and the oil guide pipe 7. Thereafter, the bolt 36 is tightened to bring the gasket 38 into close contact with the outer periphery of the pressure relief container 5, and the work is completed.

In the above embodiment, the first and second relay pipes 25
and 26 may be small enough to form a space between the pressure relief part and the oil guide pipe where inspection and repair of the pressure relief part can be performed when both are removed. There is no need for a lifter or crane. Therefore, inspection and repair work can be simplified, and since there is no need to handle heavy objects, work safety can be improved.

When performing inspection and repair work on the pressure relief device described above, an operator who is accustomed to the work procedure of conventional pressure relief devices accidentally disconnects the oil guide pipe 7 before removing the first and second relay pipes 25 and 26. One possibility is to remove the bolts of the mounting bracket 9. In such a case, if the oil guide pipe 7 falls, the operator may be injured, which is dangerous. In the present invention, since the stopper 34 that locks the first relay pipe 25 is provided, the bolts of the fitting 9 of the oil guide pipe 7 may be accidentally removed before removing the first and second relay pipes 25 and 26. It is possible to prevent the oil guide pipe from falling when the pipe is removed, thereby eliminating the risk of an accident.

In the above embodiment, the first and second pressure relief vessels 4
5 and the oil guide pipe 7 are arranged vertically side by side, but the same principle applies when the first and second pressure relief containers are arranged horizontally and a part of the oil guide pipe 7 is arranged horizontally. Can apply ideas.

[Effects of the invention] As described above, according to the invention, since the oil guide pipe is connected to the pressure relief section via the detachable first and second relay pipes, the oil guide pipe can be connected to the pressure relief part without removing the oil guide pipe. Able to perform inspection and repair work on pressure relief sections. In addition, since a stopper is provided to lock the first relay pipe to the container of the pressure relief section, it is possible to prevent the oil guide pipe from falling even if the fitting for attaching the oil guide pipe is removed by mistake. It is possible to eliminate the possibility of an accident occurring due to an error in the procedure.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of main parts showing an embodiment of the present invention, Fig. 2 is a front view showing the overall configuration of the embodiment, and Fig. 3 is a sectional view of main parts showing an embodiment of the present invention.
The figure is a front view showing the overall configuration of a conventional pressure relief device. 1... Pressure relief device, 2... Tank for electrical equipment, 3
...Mounting pipe, 4...First pressure relief container, 5...Second pressure relief container, 6...Pressure relief plate, 7...Oil guide pipe, 8
...Pressure relief part, 9...Oil guide pipe mounting bracket, 25...
1st relay pipe, 25a...pressure relief part connection flange, 26...2nd relay pipe, 34...stopper,
35...Patsukin press plate.

Claims (1)

[Claims for Utility Model Registration] A pressure relief part with a built-in pressure relief plate, and an oil guide pipe fixed to a tank of an electrical device and communicated with the pressure relief part to guide insulating oil released from the pressure relief part. A pressure relief device for oil-filled electrical equipment, which has a pressure relief part connecting flange having an inner flange at one end, and the pressure relief part connecting flange is fitted into the container of the pressure relief part from the outside. a first relay pipe arranged in a state where 2, and a stopper fixed to the container of the pressure relief section and located closer to the oil guide pipe than the inner flange of the pressure relief section connection flange, the stopper being fixed to the pressure relief section connection flange. The first relay pipe is provided so as to be movable between a locking position in which the first relay pipe is locked by abutting against the inner flange of the relay flange and a locking release position in which the locking is released. Pressure relief device for oil-filled electrical equipment.