Transformer oil tank pressure relief explosion-proof structure and transformer oil tank

Abstract

The utility model belongs to the technical field of transformers, and provides a transformer oil tank pressure relief explosion-proof structure which comprises a metal corrugated telescopic cylinder and a metal corrugated telescopic cylinder upper cover, the metal corrugated telescopic cylinder upper cover is welded to the upper portion of the metal corrugated telescopic cylinder, and the lower portion of the metal corrugated telescopic cylinder is welded to a first mounting flange plate. A first opening is formed in the middle of the first mounting flange plate, and the size of the first opening is smaller than the inner diameter of the metal corrugated telescopic cylinder. The utility model further discloses a transformer oil tank, the transformer oil tank comprises a transformer oil tank body, more than one flange connecting mechanism is arranged on the transformer oil tank body, and the flange connecting mechanisms are arranged on the top wall or the side wall of the transformer oil tank body and communicated with the interior of the transformer oil tank body. And the pressure relief explosion-proof structure is fixedly mounted on the flange connecting mechanism in a sealing manner. Pressure in the oil tank is absorbed through automatic stretching and retracting of the metal corrugated telescopic cylinder, and destructive damage to an oil tank shell caused by the internal pressure under the fault condition is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to transformer technical field, especially is above transformer technical field of ultrahigh pressure, and specifically relates to a transformer oil tank pressure relief explosion -proof structure and transformer oil tank. BACKGROUND

[0002] The transformer is important equipment in the power transmission and transformation network, and its main insulation and cooling medium are mineral oil (transformer oil). When a discharge fault occurs in the transformer, a very large arc energy is generated, especially in an ultrahigh voltage transformer. The arc energy is huge, and the arc with huge energy can cause the transformer oil to generate a large amount of gas, so that the pressure in the oil tank with a closed structure increases sharply. When the pressure exceeds the bearing capacity of the oil tank, the oil tank will be broken, and in severe cases, the transformer may even explode.

[0003] Patent publication No. CN219778656U, named as a transformer oil tank explosion -proof reinforcing structure and transformer oil tank, the explosion -proof reinforcing structure includes tank wall, tank wall top and transformer oil tank tank along connection, bottom and transformer oil tank bottom plate connection;The surrounding hoop is arranged on one end of the tank wall close to the tank along;The reinforcing plate is arranged on the corner;The reinforcing plate is attached to the tank wall and perpendicular to the tank wall. The surrounding hoop is arranged close to the tank along of the transformer oil tank, and the reinforcing plate is arranged at the corner of the transformer oil tank. Although this structure effectively strengthens the strength of the weak position of the oil tank, when the pressure in the transformer oil tank increases sharply, the internal pressure impact will be caused to the oil tank, and the existing weak point of the oil tank may be torn or even exploded. The internal pressure impact will also cause the local mechanical strength of the oil tank to decrease, thereby forming a new weak structure. In summary, the technical scheme disclosed in the above patent cannot effectively reduce the internal pressure of the oil tank, and cannot effectively solve the technical problem that the oil tank may explode. SUMMARY

[0004] In view of the problem that the transformer discharge fault leads to explosion or even explosion, the utility model designs a metal corrugated expansion device on the transformer oil tank, so that when the discharge pressure in the transformer oil tank increases sharply, the corrugated expansion device can reduce the internal pressure of the transformer oil tank by expansion, thereby avoiding the explosion of the oil tank.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A transformer oil tank pressure relief explosion -proof structure, comprising a metal corrugated telescopic cylinder and a metal corrugated telescopic cylinder upper cover, the metal corrugated telescopic cylinder upper cover is welded with the upper part of the metal corrugated telescopic cylinder, the lower part of the metal corrugated telescopic cylinder is welded with the upper surface of the mounting flange plate one, the mounting flange plate one is provided with a hole one in the middle, and the size of the hole one is smaller than the inner diameter of the metal corrugated telescopic cylinder.

[0007] Preferably, the pressure relief explosion-proof structure shell is non-contact cover buckled on the metal bellows telescopic cylinder and above the metal bellows telescopic cylinder, a spacing for the metal bellows telescopic cylinder to elongate is reserved between the pressure relief explosion-proof structure shell and the metal bellows telescopic cylinder upper cover, and the lower part of the pressure relief explosion-proof structure shell is installed on the upper surface of the mounting flange plate one through bolt connection.

[0008] Preferably, a plurality of fixed nuts are arranged on the upper surface of the mounting flange plate one at the edge position; and a fixed perforation corresponding to the fixed nut is formed at the edge position of the metal bellows telescopic cylinder upper cover.

[0009] Preferably, the shape of the mounting flange plate one and the shape of the opening one are rectangular or oval.

[0010] A transformer oil tank applying the transformer oil tank pressure relief explosion-proof structure comprises a transformer oil tank body, one or more flange connection mechanisms are arranged on the transformer oil tank body, the flange connection mechanisms are arranged on the top wall or the side wall of the transformer oil tank body and communicate with the inside of the transformer oil tank body, and the transformer oil tank pressure relief explosion-proof structure is fixedly and sealingly installed on the flange connection mechanism.

[0011] Preferably, the flange connection mechanism comprises a mounting flange plate two, the mounting flange plate two is welded on the transformer oil tank body, an opening two is formed in the middle of the mounting flange plate two, the shape and size of the opening two of the mounting flange plate two are same as those of the opening one of the mounting flange plate one, the mounting flange plate one and the mounting flange plate two are fixedly and sealingly connected through bolts and sealing pads, and an opening three is arranged on the transformer oil tank body shell at a position corresponding to the opening two, and the shape and size of the opening three are same as those of the opening two.

[0012] The utility model has the advantages of the following:

[0013] The utility model can realize the automatic elongation of the metal bellows telescopic cylinder under the condition that the internal pressure of the transformer is sharply increased due to internal failure, can absorb part of the pressure in the oil tank, can reduce the destructive damage of the internal pressure to the oil tank shell, can collect the gas formed due to the transformer failure, can avoid the transformer body from being exposed to the gas, can reduce the insulation performance of the transformer body, can make the accident further develop into more discharge faults, and can effectively reduce the damage of the oil tank shell and avoid the further deterioration of the discharge fault and even major dangerous accidents such as explosion. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings are used to provide further understanding of the utility model and constitute a part of the specification, are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation on the utility model.

[0015] Figure 1 is a front view of the transformer oil tank pressure relief explosion-proof structure and the transformer oil tank of the utility model embodiment;

[0016] Figure 2 is a top view of the transformer oil tank pressure relief explosion-proof structure and the transformer oil tank of the utility model embodiment;

[0017] Wherein, 1-pressure relief explosion-proof structure shell, 2-metal corrugated telescopic cylinder upper cover, 3-metal corrugated telescopic cylinder, 4-fixing nut, 5-installation flange plate one, 6-installation flange plate two, 7-transformer oil tank body. DETAILED DESCRIPTION

[0018] The technical scheme of the utility model will be described clearly and completely below in conjunction with the drawings, obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments.

[0019] Figure 1 And Figure 2 contains the internal perspective effect of pressure relief explosion-proof structure shell 1, in conjunction with Figure 1 , Figure 2 The utility model embodiment provides a kind of transformer oil tank pressure relief explosion-proof structure, including the pressure relief explosion-proof structure shell 1 of steel material, pressure relief explosion-proof structure shell 1 is covered in contact on metal corrugated telescopic cylinder upper cover 2 and metal corrugated telescopic cylinder 3 top, pressure relief explosion-proof structure shell 1 relative metal corrugated telescopic cylinder upper cover 2 retain certain spacing, this spacing needs to be able to meet the automatic telescopic maximum stroke of metal corrugated telescopic cylinder 3, pressure relief explosion-proof structure shell 1 can play dustproof and protection to the internal structural member such as metal corrugated telescopic cylinder 3 and metal corrugated telescopic cylinder upper cover 2 located in its interior.

[0020] Metal corrugated telescopic cylinder upper cover 2 lower surface and metal corrugated telescopic cylinder 3 upper portion are fixedly connected by welding, metal corrugated telescopic cylinder 3 lower portion and installation flange plate one 5 upper surface are fixedly connected by welding, pressure relief explosion-proof structure shell 1 lower portion and installation flange plate one 5 upper surface are detachably fixedly connected by bolt.Opening one is set in the middle of installation flange plate one 5, and the size of the opening one is slightly smaller than the inner diameter of metal corrugated telescopic cylinder 3.

[0021] Several fixing nuts 4 are evenly distributed and welded along the edge of the upper surface of the mounting flange 5. Fixing holes corresponding to the fixing nuts 4 are formed along the edge of the metal corrugated expansion cylinder cover 2. During transformer transportation or positive / negative pressure testing, to prevent deformation or damage to the metal corrugated expansion cylinder 3, the lower end of the fixing screw is passed through the fixing holes on the metal corrugated expansion cylinder cover 2, and the lower end of the fixing screw is tightened to the upper end of the fixing nuts 4, thus securing the metal corrugated expansion cylinder 3. When the transformer is put into operation, the fixing screw is unscrewed from the fixing nuts 4, allowing the metal corrugated expansion cylinder 3 to automatically extend and retract.

[0022] The thickness and weight of the metal corrugated telescopic cylinder cover 2 are determined according to the internal oil pressure of the transformer. If the weight of the existing metal corrugated telescopic cylinder cover 2 cannot meet the requirements, a counterweight block can be added to the metal corrugated telescopic cylinder cover 2.

[0023] The pressure relief and explosion-proof structure for transformer oil tanks in this embodiment of the invention operates on the following principle: A retractable corrugated metal telescopic cylinder 3 is installed on the upper part of the transformer oil tank body 7. The upper cover 2 of the corrugated metal telescopic cylinder has different weights according to the internal oil pressure of the transformer, keeping the upper cover 2 in a low position (initial state). When a deflagration fault occurs in the transformer, causing a sharp increase in the internal pressure of the transformer oil tank body 7, the internal pressure overcomes the weight of the upper cover 2, causing the corrugated metal telescopic cylinder 3 to extend, increasing the volume of the transformer oil tank and reducing the impact of internal pressure on the transformer oil tank. When the fault occurs, the metal corrugated expansion cylinder 3 extends and its height increases. The gas generated in the oil tank due to the fault automatically rises and eventually concentrates inside the metal corrugated expansion cylinder 3. This allows the transformer body to continue to be immersed in transformer oil. At this time, because the fault gas is concentrated in the metal corrugated expansion cylinder 3, the low-temperature transformer oil inside the oil conservator can be replenished to the previously unimmersed discharge position, cooling the discharge position, improving the insulation performance of the transformer body, and preventing further deterioration of discharge accidents. By installing the metal corrugated expansion cylinder 3, the occurrence of large-scale power accidents such as transformer oil tank explosions can be reduced.

[0024] A transformer oil tank includes a transformer oil tank body 7, on which the pressure relief and explosion-proof structure is sealed and installed via a second mounting flange 6. The second mounting flange 6 is welded to the center of the top of the transformer oil tank body 7, and has a second opening in its center. The size of the second opening in the second mounting flange 6 is the same as the size of the first opening in the first mounting flange 5. The first mounting flange 5 and the second mounting flange 6 are fixedly and sealed together by bolts and gaskets.

[0025] Although Figure 1 , 2The pressure relief and explosion-proof structure shown is rectangular. However, the above-mentioned pressure relief and explosion-proof structure is not limited to rectangular or elliptical structures, and can be flexibly designed according to the space at the tank cover of the transformer tank body 7. Multiple of the above-mentioned pressure relief and explosion-proof structures can also be installed on a single transformer tank body 7, and the pressure relief and explosion-proof structure can also be installed on the side wall or other locations of the transformer tank body 7.

[0026] In this embodiment of the utility model, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0027] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model.

Claims

1. A transformer oil tank pressure relief explosion-proof structure comprising a metal corrugated telescopic cylinder (3) and a metal corrugated telescopic cylinder upper cover (2), characterized in that, The metal corrugated telescopic cylinder upper cover (2) is welded with the upper part of the metal corrugated telescopic cylinder (3), the lower part of the metal corrugated telescopic cylinder (3) is welded with the upper surface of the mounting flange plate (5), the middle part of the mounting flange plate (5) is provided with an opening one, and the size of the opening one is smaller than the inner diameter of the metal corrugated telescopic cylinder (3).

2. The transformer tank pressure relief explosion-proof structure according to claim 1, characterized in that: The pressure relief explosion-proof structure shell (1) is non-contact cover in the metal corrugated telescopic cylinder upper cover (2) and the metal corrugated telescopic cylinder (3) above, the pressure relief explosion-proof structure shell (1) and the metal corrugated telescopic cylinder upper cover (2) between the reserved for the metal corrugated telescopic cylinder (3) elongation spacing, the pressure relief explosion-proof structure shell (1) lower part is connected by bolt installation on the upper surface of the mounting flange plate (5).

3. The transformer tank pressure relief explosion-proof structure according to claim 1, characterized in that: The upper surface of the mounting flange plate (5) is provided with a plurality of fixed nuts (4) welded on the edge position; the edge position of the metal corrugated telescopic cylinder upper cover (2) is provided with a fixed perforation corresponding to the fixed nut (4).

4. The pressure relief explosion-proof structure of a transformer oil tank according to any one of claims 1-3, characterized in that: The shape of the mounting flange plate (5) and the shape of the opening one are rectangular or oval.

5. A transformer tank using the pressure relief explosion-proof structure of claim 1, comprising a transformer tank body (7), characterized in that: More than one flange connecting mechanism is arranged on the transformer oil tank body (7), the flange connecting mechanism is arranged on the top wall or side wall of the transformer oil tank body (7), and the flange connecting mechanism is in communication with the inside of the transformer oil tank body (7); the transformer oil tank pressure relief explosion-proof structure is fixed and sealed on the flange connecting mechanism.

6. A transformer tank according to claim 5, characterized in that: The flange connecting mechanism includes a mounting flange plate two (6), the mounting flange plate two (6) is welded on the transformer oil tank body (7), the mounting flange plate two (6) is provided with an opening two in the middle part, the opening two of the mounting flange plate two (6) is the same as the shape and size of the opening one of the mounting flange plate one (5), the mounting flange plate one (5) and the mounting flange plate two (6) are fixed and sealed by bolts and sealing pads; the transformer oil tank body (7) is provided with an opening three at the corresponding position of the opening two, and the shape and size of the opening three are the same as those of the opening two.

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