An internal transformer fault pressure relief device

Abstract

The application discloses a transformer internal fault pressure release device, which comprises a pressure relief shell body installed on the top of a transformer tank, an upper through pipe is fixedly installed on the left side of the top of the transformer tank through an opening, and the upper through pipe is located on the inner side of the pressure relief shell body; a main sealing assembly is formed by a plug-in pipe and a sealing ring; an automatic compensation sealing system is formed by matching a rubber air bag, a gas cylinder and a vertical guide pipe; when the transformer is normally operated, a first spring compresses a sealing round seat, reliable sealing is realized by relying on the sealing ring to adhere to the inner wall of the upper through pipe; when the pressure is too high, oil lifts the sealing round seat to complete pressure relief; after the pressure relief is completed, the spring drives the sealing round seat to fall back to the original position; if the sealing ring is scratched and damaged by high-speed oil and gas impact during the pressure relief process, the sealing round seat drives the top gas cylinder to move downward during the falling process; the space in the gas cylinder is compressed; and the air in the cylinder is transported to the inside of the rubber air bag through the vertical guide pipe and the elastic pipe.

Description

Technical Field

[0001] This invention relates to the field of transformer pressure relief technology, specifically to a transformer internal fault pressure relief device. Background Technology

[0002] When an oil-immersed transformer experiences internal faults such as winding short circuits or insulation breakdown, the electric arc will crack the insulating oil and generate a large amount of flammable gas, causing a sudden increase in pressure inside the tank. Without a reliable pressure relief structure, this can easily lead to tank cracking, oil leakage, fire, or even explosion. Therefore, the pressure relief device is a core safety component of the transformer.

[0003] Existing conventional pressure relief valves rely on a single spring to press a single-layer sealing diaphragm to achieve sealing and pressure relief. While simple in structure and low in cost, they are commonly used in small distribution transformers. However, they have significant shortcomings in high-voltage, high-capacity main transformer scenarios, such as: 1. High risk of seal failure, no backup sealing solution, traditional devices rely solely on a single sealing gasket to block the channel. During a fault depressurization, high-speed oil and gas impact and high-temperature oil erosion can easily scratch and age the seals; after depressurization and reset, if the sealing gasket is damaged or deformed, there will be long-term risks of oil leakage and air intake, directly reducing the transformer insulation life. Furthermore, the device lacks an emergency compensation sealing structure, requiring shutdown and replacement of parts, resulting in high operation and maintenance costs.

[0004] 2. The pressure relief action is simple and lacks graded limit and status locking structures. Traditional valves have no positioning limit structure after opening. When the pressure fluctuates, the cover plate opens and closes repeatedly, resulting in intermittent pressure relief and insufficient pressure relief efficiency. At the same time, there is no mechanical locking mark after pressure relief is completed, so maintenance personnel cannot intuitively judge whether the device has triggered a fault. There is a lack of fault warning prompt structure, making it difficult to locate the internal abnormality of the transformer in the first time.

[0005] 3. There is no automatic compensation sealing mechanism after pressure relief. If the main seal is damaged, the traditional device does not have a matching auxiliary sealing mechanism. The oil tank will continue to leak oil and gas. Long-term operation will cause the oil level to drop and the insulation to become damp, which will seriously expand the scope of the fault and the overall protection fault tolerance rate is extremely low.

[0006] Therefore, a transformer internal fault pressure relief device is now designed to address this type of defect. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a transformer internal fault pressure relief device, which solves the problem of easy seal failure in existing pressure relief devices.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a transformer internal fault pressure relief device, comprising a pressure relief shell body installed on the top of the transformer tank, an upper through-pipe fixedly installed on the left side of the top of the transformer tank through an opening, the upper through-pipe being located inside the pressure relief shell body, a drain pipe fixedly installed on the left side of the pressure relief shell body through an opening, a sealing round seat provided on the inner side of the pressure relief shell body, the sealing round seat being in contact with the inner wall of the pressure relief shell body, a plug pipe for use with the upper through-pipe being fixedly installed at the bottom of the sealing round seat through an opening, the plug pipe being in contact with the inner wall of the upper through-pipe, and a sealing ring fixedly installed on the surface of the plug pipe, the sealing ring being in contact with the inner wall of the upper through-pipe.

[0009] Preferably, a partition plate is fixedly installed on the upper part of the inner wall of the pressure relief shell body, and a pressing column is slidably installed on the top of the partition plate through an opening. The bottom end of the pressing column is fixedly connected to the sealing round seat, and a blocking recess is fixedly installed on the top end of the pressing column.

[0010] Preferably, a dome seat is fixedly installed on the top of the inner cavity of the pressure relief shell body through an opening, and a warning button is slidably installed on the top of the dome seat through an opening. A lifting rod is fixedly connected to the bottom of the inner cavity of the stop recess, and the top of the lifting rod is connected to the warning button. A first spring is provided on the surface of the lifting rod, and the two ends of the first spring are fixedly connected to the stop recess and the dome seat respectively.

[0011] Preferably, a lifting rod is slidably installed on the top of the partition plate through an opening, and several lifting rods are provided. The bottom end of the lifting rod passes through the sealing round seat and extends to the inside of the insertion tube. A counterweight plate is fixedly connected to one end of the sealing round seat extending to the inside of the insertion tube. A rubber airbag is fixedly installed at the bottom of the counterweight plate. A positioning groove is provided on one side of the lifting rod and at the top of the partition plate.

[0012] Preferably, rectangular vertical plates are slidably installed on the front and rear parts of the top two sides of the partition plate through openings. The bottom end of the rectangular vertical plate is fixedly connected to the sealing round seat. A first guide rod and a second guide rod are slidably installed on the upper and lower parts of one side of the rectangular vertical plate through openings, respectively. The right ends of the second guide rod and the first guide rod are respectively fixedly connected to an arc-shaped insert and a positioning insert, and the arc-shaped insert is located inside the positioning groove. A second spring is provided on the surface of the first guide rod and the second guide rod.

[0013] Preferably, the inner wall of the pressure relief shell body, located above the partition plate, is fixedly mounted with a sloping pressure seat that cooperates with the arc-shaped insert block via a bracket.

[0014] Preferably, a vertical guide tube is slidably installed at the bottom of the partition plate through an opening, and several vertical guide tubes are provided. The bottom end of the vertical guide tube passes through the sealing round seat and extends to the inside of the insertion tube. The vertical guide tube is fixedly connected to the sealing round seat. The bottom end of the vertical guide tube is connected to an elastic tube, and the bottom end of the elastic tube passes through the counterweight plate and the rubber airbag and extends to the inside of the rubber airbag.

[0015] Preferably, a compressor cylinder for use with a vertical guide tube is fixedly installed on the top of the stop recess frame by a bracket, an air inlet is provided on the lower part of the inner wall of the compressor cylinder, and a sealing plug for use with a vertical guide tube is fixedly installed on the top of the inner cavity of the compressor cylinder.

[0016] This invention provides a transformer internal fault pressure relief device. Compared with existing technologies, it has the following advantages: (1) The internal fault pressure relief device of the transformer consists of a main sealing component composed of a plug pipe and a sealing ring, and is equipped with a rubber airbag, a compressed air cylinder and a vertical pipe to form an automatic compensation sealing system. When the transformer is running normally, the first spring presses the sealing round seat, and the sealing ring adheres to the inner wall of the upper pipe to achieve reliable sealing. When the fault is over-pressured, the oil lifts the sealing round seat to complete the pressure relief. After the pressure relief is completed, the spring drives the sealing round seat to fall back to reset. If the sealing ring is scratched or damaged by the impact of high-speed oil and gas during the pressure relief process, the top compressed air cylinder will move down synchronously during the descent of the sealing round seat. The internal space of the compressed air cylinder is compressed, and the air in the cylinder is transported to the inside of the rubber airbag through the vertical pipe and the elastic pipe. The airbag expands rapidly and adheres tightly to the plug pipe and the inner wall of the upper pipe to form a second sealing barrier, temporarily blocking the pressure relief channel and preventing oil leakage and air intake problems until the maintenance personnel arrive to replace the sealing ring. No manual intervention is required throughout the process, which solves the defect of the traditional device that a single seal will permanently fail when damaged, extends the fault-free operation cycle of the device, and reduces the risk of sudden oil leakage and insulation moisture.

[0017] (2) The internal fault pressure relief device of the transformer records the action status through the two-stage limit structure of the arc surface plug and the positioning plug throughout the pressure relief process. During the pressure relief rising stage, the inclined pressure seat pushes open the arc surface plug to unlock the counterweight plate. After the pressure relief falls back, the positioning plug automatically locks the lifting rod, and the air bag assembly remains in the lowered standby state. This mechanical locking state will not be automatically eliminated as the pressure falls back. It has a fault memory function. Compared with the disadvantages of traditional relief valves that leave no trace after pressure relief and cannot distinguish whether the device has been activated, this device relies on a pure mechanical structure to realize fault recording and on-site early warning. It has high reliability and is not affected by power outages or sensor failures. It greatly improves the efficiency of substation fault investigation and avoids the risk of secondary fault expansion of transformers in advance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2This is a cross-sectional view of the pressure relief shell body and transformer box structure of the present invention; Figure 3 For the present invention Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the internal structure of the pressure relief shell body of the present invention; Figure 5 For the present invention Figure 4 A magnified view of a section at point B in the middle; Figure 6 This is a schematic diagram of the sealing round seat, sealing ring, and first spring structure of the present invention; Figure 7 This is a schematic diagram of the positioning groove, counterweight plate, and rubber airbag structure of the present invention. Figure 8 This is a cross-sectional view of the sealing circular seat structure of the present invention; Figure 9 This is a cross-sectional view of the air cylinder structure of the present invention; Figure 10 This is a schematic diagram of the dome seat, warning button, and inclined pressure seat structure of the present invention.

[0019] In the diagram: 1. Pressure relief shell body; 2. Transformer box; 3. Drain pipe; 4. Top through pipe; 5. Sealing round seat; 6. Insertion pipe; 7. Sealing ring; 8. Divider plate; 9. Pressing column; 10. Resistance recess frame; 11. First spring; 12. Lifting rod; 13. Dome seat; 14. Warning button; 15. Lifting rod; 16. Positioning groove; 17. Counterweight plate; 18. Rubber airbag; 19. Rectangular vertical plate; 20. First guide rod; 21. Second guide rod; 22. Arc-shaped insert block; 23. Positioning insert block; 24. Second spring; 25. Sloping pressure seat; 26. Vertical guide tube; 27. Elastic tube; 28. Air cylinder; 29. ​​Air inlet; 30. Sealing plug. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-10The present invention provides a technical solution: a transformer internal fault pressure relief device, including a pressure relief shell body 1 installed on the top of the transformer box 2, an upper through pipe 4 fixedly installed on the left side of the top of the transformer box 2 through an opening, and the upper through pipe 4 is located inside the pressure relief shell body 1, a drain pipe 3 fixedly installed on the left side of the pressure relief shell body 1 through an opening, a sealing round seat 5 is provided on the inner side of the pressure relief shell body 1, and the sealing round seat 5 is in contact with the inner wall of the pressure relief shell body 1, a plug pipe 6 for cooperating with the upper through pipe 4 is fixedly installed at the bottom of the sealing round seat 5 through an opening, and the plug pipe 6 is in contact with the inner wall of the upper through pipe 4, and a sealing ring 7 is fixedly installed on the surface of the plug pipe 6, and the sealing ring 7 is in contact with the inner wall of the upper through pipe 4.

[0022] Furthermore, a partition plate 8 is fixedly installed on the upper part of the inner wall of the pressure relief shell body 1. A pressing column 9 is slidably installed on the top of the partition plate 8 through an opening. The bottom end of the pressing column 9 is fixedly connected to the sealing round seat 5. A blocking recess 10 is fixedly installed on the top end of the pressing column 9.

[0023] The pressure relief shell body 1 has a dome seat 13 fixedly installed at the top of the inner cavity through an opening. A warning button 14 is slidably installed at the top of the dome seat 13 through an opening. A lifting rod 12 is fixedly connected to the bottom of the inner cavity of the stop recess 10, and the top of the lifting rod 12 is connected to the warning button 14. A first spring 11 is provided on the surface of the lifting rod 12, and the two ends of the first spring 11 are fixedly connected to the stop recess 10 and the dome seat 13 respectively.

[0024] Among them, a lifting rod 15 is slidably installed on the top of the partition plate 8 through an opening, and several lifting rods 15 are provided. The bottom end of the lifting rod 15 passes through the sealing round seat 5 and extends to the inside of the insertion pipe 6. A counterweight plate 17 is fixedly connected to one end of the sealing round seat 5 extending to the inside of the insertion pipe 6. A rubber airbag 18 is fixedly installed at the bottom of the counterweight plate 17. A positioning groove 16 is opened on one side of the lifting rod 15 and at the top of the partition plate 8.

[0025] In this partition plate 8, rectangular vertical plates 19 are slidably installed on the front and rear sides of the top two sides through openings. The bottom end of the rectangular vertical plate 19 is fixedly connected to the sealing round seat 5. The upper and lower parts of one side of the rectangular vertical plate 19 are respectively slidably installed with a first guide rod 20 and a second guide rod 21 through openings. The right ends of the second guide rod 21 and the first guide rod 20 are respectively fixedly connected with an arc-shaped insert 22 and a positioning insert 23. The arc-shaped insert 22 is located inside the positioning groove 16. The surfaces of the first guide rod 20 and the second guide rod 21 are both provided with a second spring 24.

[0026] The inner wall of the pressure relief shell body 1, located above the partition plate 8, is fixedly installed with a bracket to a inclined pressure seat 25 that cooperates with the arc-shaped insert block 22.

[0027] The bottom of the partition plate 8 is slidably installed with a vertical guide tube 26 through an opening, and several vertical guide tubes 26 are provided. The bottom end of the vertical guide tube 26 passes through the sealing round seat 5 and extends to the inside of the insertion tube 6. The vertical guide tube 26 is fixedly connected to the sealing round seat 5. The bottom end of the vertical guide tube 26 is connected to an elastic tube 27, and the bottom end of the elastic tube 27 passes through the counterweight plate 17 and the rubber airbag 18 and extends to the inside of the rubber airbag 18.

[0028] Among them, the top of the stop recess frame 10 is fixedly installed with a support to a compressor 28 that works with the vertical guide tube 26. An air inlet 29 is provided on the lower part of the inner wall of the compressor 28. A sealing plug 30 that works with the vertical guide tube 26 is fixedly installed on the top of the inner cavity of the compressor 28.

[0029] In use, first push the rubber airbag 18 upward by hand, causing the positioning groove 16 to press against the arc-shaped insert 22, thus inserting the arc-shaped insert 22 into the inner side of the positioning groove 16. This uses the arc-shaped insert 22 to fix the lifting rod 15 and the rubber airbag 18 in place. Then, install the pressure relief shell body 1 onto the top of the transformer box 2 using bolt assemblies. The elastic force of the first spring 11 presses against the stop recess 10, causing the sealing round seat 5 to press against the bottom of the upper through pipe 4, and the sealing ring 7 to press against the inner wall of the upper through pipe 4 to achieve a seal. If a fault occurs inside the transformer box 2, causing excessive pressure... The insulating oil will rapidly push the sealing seat 5 upwards under pressure, thereby opening the drain pipe 3 to discharge the oil and release the pressure. Simultaneously, the rising of the sealing seat 5 will also cause the lifting rod 15, the rectangular vertical plate 19, and the vertical guide tube 26 to rise synchronously. The rising of the lifting rod 15 will cause the inclined pressure seat 25 to squeeze the arc-shaped insert 22, thus pushing the arc-shaped insert 22 out from the inside of the positioning groove 16. At this point, the lifting rod 15 loses its limit and, using the weight of the counterweight plate 17, drives the rubber airbag 18 to slide downwards. However, since the oil is currently flowing upwards, the lifting rod 15 is in a slow descent state. Until the positioning groove 16 reaches the position of the positioning insert 23, the positioning insert 23 is inserted into the inner side of the positioning groove 16 by the elastic force of the second spring 24, fixing the lifting rod 15 and the counterweight plate 17. At this time, the rubber airbag 18 is located below the insertion tube 6. After the oil pressure is released, the first spring 11 uses its elastic force to push the sealing round seat 5 down again, so that the insertion tube 6 is inserted into the inner side of the upper through tube 4, and the sealing ring 7 seals the upper through tube 4. However, if the sealing ring 7 is damaged under the previous impact, as the sealing round seat 5 descends, it will be pulled by the blocking recess 10. As the compressor cylinder 28 descends, air flows into the inside of the compressor cylinder 28 and the vertical guide tube 26 through the air inlet 29. The descent of the compressor cylinder 28 also causes the air inlet 29 to be blocked and sealed by the vertical guide tube 26. Then, the air is compressed and enters the rubber air bladder 18 through the elastic tube 27, causing the rubber air bladder 18 to inflate and contact the inner wall of the upper pipe 4 to seal, thereby preventing damage to the sealing ring 7 and resulting in poor sealing. This continues until the sealing seat 5 descends to the bottom, allowing the sealing plug 30 to be inserted into the top of the vertical guide tube 26 for sealing, until it is reset by the subsequent maintenance personnel.

[0030] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

Claims

1. A transformer internal fault pressure relief device, comprising a pressure relief shell body (1) installed on the top of the transformer tank (2), characterized in that: The transformer box (2) has an opening on the left side of the top, and the upper pipe (4) is fixedly installed inside the pressure relief shell body (1). The pressure relief shell body (1) has an opening on the left side, and a drain pipe (3) is fixedly installed inside the pressure relief shell body (1). A sealing round seat (5) is provided inside the pressure relief shell body (1), and the sealing round seat (5) is in contact with the inner wall of the pressure relief shell body (1). The bottom of the sealing round seat (5) has an opening, and a plug pipe (6) is fixedly installed to cooperate with the upper pipe (4). The plug pipe (6) is in contact with the inner wall of the upper pipe (4). A sealing ring (7) is fixedly installed on the surface of the plug pipe (6), and the sealing ring (7) is in contact with the inner wall of the upper pipe (4). A partition plate (8) is fixedly installed on the upper part of the inner wall of the pressure relief shell body (1). A pressing column (9) is slidably installed on the top of the partition plate (8) through an opening. The bottom end of the pressing column (9) is fixedly connected to the sealing round seat (5). A stop recess (10) is fixedly installed on the top end of the pressing column (9). The top of the inner cavity of the pressure relief shell body (1) is fixedly installed with a dome seat (13) through an opening. The top of the dome seat (13) is slidably installed with a warning button (14) through an opening. The bottom of the inner cavity of the stop frame (10) is fixedly connected with a lifting rod (12), and the top of the lifting rod (12) is connected to the warning button (14). The surface of the lifting rod (12) is provided with a first spring (11), and the two ends of the first spring (11) are fixedly connected to the stop frame (10) and the dome seat (13) respectively. A lifting rod (15) is slidably installed on the top of the partition plate (8) through an opening, and there are several lifting rods (15). The bottom end of the lifting rod (15) passes through the sealing round seat (5) and extends to the inside of the insertion tube (6). A counterweight plate (17) is fixedly connected to one end of the sealing round seat (5) extending to the inside of the insertion tube (6). A rubber airbag (18) is fixedly installed at the bottom of the counterweight plate (17). A positioning groove (16) is opened on one side of the lifting rod (15) and at the top of the partition plate (8). The front and rear parts of the top two sides of the partition plate (8) are slidably installed with rectangular vertical plates (19) through openings. The bottom end of the rectangular vertical plate (19) is fixedly connected to the sealing round seat (5). The upper and lower parts of one side of the rectangular vertical plate (19) are respectively slidably installed with a first guide rod (20) and a second guide rod (21) through openings. The right ends of the second guide rod (21) and the first guide rod (20) are respectively fixedly connected with a positioning plug (23) and an arc-shaped plug (22), and the arc-shaped plug (22) is located inside the positioning groove (16). The surfaces of the first guide rod (20) and the second guide rod (21) are both provided with a second spring (24). The inner wall of the pressure relief shell body (1) and the upper part of the partition plate (8) is fixedly installed with a bracket to cooperate with the arc-shaped insert (22).

2. The transformer internal fault pressure relief device according to claim 1, characterized in that: The bottom of the partition plate (8) is slidably installed with a vertical guide tube (26) through an opening, and there are several vertical guide tubes (26). The bottom end of the vertical guide tube (26) passes through the sealing round seat (5) and extends to the inside of the insertion tube (6). The vertical guide tube (26) is fixedly connected to the sealing round seat (5). The bottom end of the vertical guide tube (26) is connected to an elastic tube (27), and the bottom end of the elastic tube (27) passes through the counterweight plate (17) and the rubber airbag (18) and extends to the inside of the rubber airbag (18).

3. The transformer internal fault pressure relief device according to claim 2, characterized in that: The top of the stop recess (10) is fixedly installed with a support and a compressor (28) that works with the vertical guide tube (26). An air inlet (29) is provided on the lower part of the inner wall of the compressor (28). A sealing plug (30) that works with the vertical guide tube (26) is fixedly installed on the top of the inner cavity of the compressor (28).

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