Transformer leakage detection device

Abstract

The utility model provides a transformer leakage detection device, which belongs to the technical field of transformers and comprises a connecting pipe and an inflation head arranged at the air outlet end of the connecting pipe, a barometer is arranged on the outer cambered surface of the connecting pipe close to the inflation head, and a sealing mechanism is arranged on the outer surface of the inflation head. The air inflation device is characterized in that the sealing mechanism comprises a plurality of cavities annularly and evenly formed in the wall body of the air inflation head, the upper end of each cavity is slidably connected with a rectangular barrel, the lower end of each rectangular barrel is provided with a piston ring, the piston rings are slidably connected with the vertically adjacent cavities respectively, and a sealing air bag is arranged outside the air inflation head. Transmission pipelines are arranged between the sealing air bags and the cavities. By means of the sealing mechanism, due to the compressibility of gas, self-adaptive sealing can be achieved, the problem that the inflation head is prone to leakage when fluctuating is solved, the detection accuracy and the detection efficiency of the transformer are greatly improved, the device can adapt to oil filling ports of different transformers with different diameters, and the application range is greatly widened.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, specifically relating to a transformer leakage detection device. Background Technology

[0002] A transformer is a device used to transmit and distribute electrical energy. It converts alternating current energy of one voltage level into alternating current energy of another voltage level at the same frequency through the principle of electromagnetic induction. Currently, there are dry-type and wet-type transformers. When using wet-type transformers, it is necessary to detect whether there is a problem of oil leakage. A transformer leakage detection device is usually used.

[0003] Existing transformer leakage detection devices mostly use hydraulic oil or air to fill the transformer for detection. The method of filling with hydraulic oil is not only complicated but also time-consuming. Although the air filling method is relatively convenient, it is limited because the air filling head and the oil filling port are often sealed with a single gasket. When the air filling head is subjected to external force, leakage is prone to occur, which affects the accuracy and efficiency of the detection. Utility Model Content

[0004] In view of this, the present invention provides a transformer leakage detection device, which can self-seal due to the compressibility of gas through a sealing mechanism, solving the problem of easy leakage when the gas filling head fluctuates, greatly improving the detection accuracy and efficiency of transformers, and can adapt to different transformer oil filling port diameters, greatly expanding the scope of application.

[0005] To solve the above-mentioned technical problems, this utility model provides a transformer leakage detection device, including a connecting pipe and an inflation head disposed at its outlet end. A pressure gauge is provided on the outer arc surface of the connecting pipe near the inflation head, and a sealing mechanism is provided on the outer surface of the inflation head. The sealing mechanism is characterized by comprising multiple chambers uniformly arranged in a ring within the wall of the inflation head. A rectangular cylinder is slidably connected to the upper end of each chamber, and a piston ring is provided at the lower end of each rectangular cylinder. The piston ring is slidably connected to the vertically adjacent chambers. A sealing airbag is provided on the outside of the inflation head, and a transmission pipe is provided between the sealing airbag and the chambers. That is, due to the compressibility of the gas, it can self-seal, solving the problem of easy leakage when the inflation head fluctuates. This greatly improves the detection accuracy and efficiency of transformers, can adapt to different transformer oil filler port diameters, and greatly expands the scope of application.

[0006] The sealing mechanism also includes rectangular blocks respectively set on the outer side of the upper end of the rectangular cylinder. The outer arc surface of the inflation head is provided with a guide groove near each rectangular block. The rectangular blocks are respectively in the guide grooves located on the same side. The inflation head is movably fitted with a threaded sleeve. The connecting pipe is also provided with a limiting component that cooperates with the threaded sleeve, which plays the role of synchronous driving.

[0007] The sealing mechanism also includes springs respectively disposed between the rectangular tube and its chamber, which utilize their own elasticity to provide support for the rectangular tube and its auxiliary mechanisms.

[0008] The limiting component includes a retaining ring disposed outside the inflation head. The outer arc surface of the retaining ring is threadedly connected to the limiting ring, which can cooperate with the threaded sleeve to apply downward pressure to the inflation head.

[0009] A valve is installed inside the connecting pipe away from the pressure gauge to prevent gas backflow due to pressure fluctuations.

[0010] The diameter of the retaining ring is smaller than the inner diameter of the upper end of the threaded sleeve, while the diameter of the limiting ring is larger than the inner diameter of the upper end of the threaded sleeve, thus ensuring that the threaded sleeve can be replaced smoothly.

[0011] The outer ends of the rectangular blocks all extend into the threaded sleeve, ensuring that the threaded sleeve can drive the rectangular blocks to move synchronously when it moves downward.

[0012] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0013] 1. Connect the air inlet end of the connecting pipe to the air source, then insert the air filling head into the oil filling port of the transformer to be tested. Next, rotate the threaded sleeve, which moves downwards along the outside of the air filling head, causing the rectangular block to slide downwards along the guide groove. This, in turn, pushes the rectangular cylinder and piston rings against the spring force and into the chamber. As the piston rings move, the gas in the chamber is compressed and enters the sealing airbag through the transmission pipe, causing it to expand and tightly seal against the inner wall of the oil filling port. Because the compressibility of the gas allows for self-sealing, this solves the problem of leakage when the air filling head fluctuates, greatly improving the transformer's performance. The accuracy and efficiency of the pressure test are ensured by stopping the pumping operation after the gas inside the transformer reaches the set value. Then, the pressure change inside the transformer is monitored in real time by a pressure gauge. When the pressure value remains unchanged, there is no leakage; otherwise, a transformer leak is detected. The valve design prevents gas backflow when closed, avoiding gas backflow due to pressure fluctuations that could affect the test results. After the test is completed, the threaded sleeve is rotated in the opposite direction to move it upward, releasing the rectangular cylinder and piston ring. The sealing airbag also contracts, releasing the seal. Finally, the inflation head is pulled out from the inflation port, completing the entire test process.

[0014] 2. The threaded sleeve continues to rotate and move downwards, eventually contacting the limiting ring, thereby providing a downward pressure to the inflation head and ensuring that the sealing mechanism remains stable throughout the testing process without loosening or failing.

[0015] 3. When the diameter of the transformer oil port changes, unscrew the limit ring, replace the threaded sleeve, and finally reset the limit ring. This can adapt to different transformer oil port diameters, greatly improving the applicability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of a transformer leakage detection device according to the present invention;

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0018] Figure 3 This is an enlarged structural diagram of point A in this utility model;

[0019] Figure 4 This is a bottom view of the structure of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 100, connecting pipe; 200, inflation head; 300, valve; 400, pressure gauge; 500, chamber; 501, rectangular cylinder; 502, piston ring; 503, sealing airbag; 504, transmission pipe; 505, rectangular block; 506, guide groove; 507, threaded sleeve; 508, spring; 600, retaining ring; 601, limiting ring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-4 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0022] This embodiment provides a transformer leakage detection device, such as... Figure 1-4 As shown: It includes a connecting pipe 100 and an inflation head 200 disposed at its air outlet end. A pressure gauge 400 is provided on the outer arc surface of the connecting pipe 100 near the inflation head 200. The outer surface of the inflation head 200 is provided with a sealing mechanism. The sealing mechanism is characterized in that: a plurality of chambers 500 are uniformly arranged in a ring in the wall of the inflation head 200. The upper end of each chamber 500 is slidably connected to a rectangular tube 501. The lower end of each rectangular tube 501 is provided with a piston ring 502. The piston ring 502 is slidably connected to the vertically adjacent chambers 500 respectively. A sealing airbag 503 is provided on the outside of the inflation head 200. A transmission pipe 504 is provided between the sealing airbag 503 and the chambers 500.

[0023] Connect the air inlet end of the connecting pipe 100 to the air source, then insert the air filling head 200 into the oil filling port of the transformer to be tested. Then drive the rectangular block 505 to slide down along the guide groove 506, thereby pushing the rectangular cylinder 501 and piston ring 502 to slide into the chamber 500. As the piston ring 502 moves, the gas in the chamber 500 is compressed and enters the sealing air bag 503 through the transmission pipe 504, causing it to expand and tightly fit against the inner wall of the oil filling port to form a seal. Since the compressibility of the gas can self-adapt to the seal, the problem of easy leakage when the air filling head fluctuates is solved, which greatly improves the detection accuracy and efficiency of the transformer.

[0024] like Figure 1-4 As shown, the sealing mechanism also includes rectangular blocks 505 respectively disposed on the outer side of the upper end of the rectangular cylinder 501. The outer arc surface of the inflation head 200 is provided with a guide groove 506 near each rectangular block 505. The rectangular blocks 505 are respectively located in the guide grooves 506 adjacent to each other on the same side. A threaded sleeve 507 is movably sleeved on the outside of the inflation head 200. A limiting component that cooperates with the threaded sleeve 507 is also provided on the outside of the connecting pipe 100. The inflation head 200 is inserted into the oil filling port of the transformer to be tested. Then, the threaded sleeve 507 is rotated. The threaded sleeve 507 moves downward along the outside of the inflation head 200, causing the rectangular blocks 505 to slide downward along the guide grooves 506, thereby pushing the rectangular cylinder 501 and the piston ring 502 to slide into the chamber 500 against the elastic force of the spring 508, thus playing a synchronous driving role.

[0025] like Figure 2-3 As shown, the sealing mechanism also includes springs 508 respectively disposed between the rectangular tube 501 and its chamber 500. The springs 508 utilize their own elasticity to provide support for the rectangular tube 501 and its associated mechanisms.

[0026] like Figure 2-3 As shown, the limiting component includes a retaining ring 600 disposed outside the inflation head 200. The outer arc surface of the retaining ring 600 is threadedly connected to a limiting ring 601, which can cooperate with the threaded sleeve 507 to apply downward pressure to the inflation head 200.

[0027] like Figure 1-4 As shown, a valve 300 is installed inside the connecting pipe 100 at a distance from the pressure gauge 400. The valve 300 is designed to prevent gas backflow when closed, thus avoiding gas backflow due to pressure fluctuations and affecting the test results.

[0028] like Figure 2-3 As shown, the diameter of the retaining ring 600 is smaller than the upper inner diameter of the threaded sleeve 507, and the diameter of the limiting ring 601 is larger than the upper inner diameter of the threaded sleeve 507, ensuring that the threaded sleeve 507 can be replaced smoothly. At the same time, it can also apply downward pressure to the inflation head 200 through the cooperation of the limiting ring 601 and the threaded sleeve 507 when locked.

[0029] like Figure 2-3 As shown, the outer ends of the rectangular block 505 extend into the threaded sleeve 507, ensuring that the threaded sleeve 507 can drive the rectangular block 505 to move synchronously when it moves downward.

[0030] The working principle of the transformer leakage detection device provided by this utility model is as follows: First, connect the air inlet end of the connecting pipe 100 to the air source. Then, insert the inflation head 200 into the oil filling port of the transformer to be tested. Next, rotate the threaded sleeve 507, which moves downward along the outside of the inflation head 200, causing the rectangular block 505 to slide downward along the guide groove 506. This, in turn, pushes the rectangular cylinder 501 and the piston ring 502 to overcome the elastic force of the spring 508 and slide into the chamber 500. As the piston ring 502 moves, the gas in the chamber 500 is compressed and enters the sealing airbag 503 through the transmission pipe 504, causing it to expand and tightly fit against the inner wall of the oil filling port to form a seal. Due to the compressibility of the gas, it can self-adapt to the seal, solving the problem of easy leakage when the inflation head fluctuates. This greatly improves the detection accuracy and efficiency of the transformer. The threaded sleeve 507 continues to rotate and move downward, eventually contacting the limiting ring 601, thereby providing a downward pressure to the inflation head 200 to ensure a seal. The sealing mechanism remains stable throughout the entire testing process, without loosening or malfunctioning. Gas is then pumped into the transformer via the connecting pipe 100 and the inflation head 200. Once the gas level inside the transformer reaches the set value, the pumping operation stops. The pressure gauge 400 monitors the pressure changes inside the transformer in real time. If the pressure remains constant, there is no leakage; otherwise, a leak is detected. The valve 300 is designed to prevent backflow of gas when closed, avoiding pressure fluctuations that could affect the test results. After the test is completed, the threaded sleeve 507 is rotated in the opposite direction to move it upwards, releasing the rectangular cylinder 501 and piston ring 502. The sealing airbag 503 also contracts, releasing the seal. Finally, the inflation head 200 is pulled out of the inflation port, completing the entire testing process. When the transformer's oil port diameter changes, the limit ring 601 is unscrewed, the threaded sleeve 507 is replaced, and the limit ring 601 is reset. This system can adapt to different transformer oil port diameters, greatly improving its applicability.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A transformer leakage detection device, comprising a connecting pipe (100) and an inflation head (200) disposed at its outlet end, wherein a pressure gauge (400) is provided on the outer arc surface of the connecting pipe (100) near the inflation head (200), and a sealing mechanism is provided on the outer surface of the inflation head (200), characterized in that: The sealing mechanism includes a plurality of chambers (500) uniformly arranged in a ring within the wall of the inflation head (200). Each chamber (500) has a rectangular tube (501) slidably connected to its upper end. Each rectangular tube (501) has a piston ring (502) at its lower end. The piston ring (502) is slidably connected to the vertically adjacent chambers (500). A sealing airbag (503) is provided outside the inflation head (200). A transmission pipe (504) is provided between the sealing airbag (503) and the chambers (500).

2. The transformer leakage detection device as described in claim 1, characterized in that: The sealing mechanism also includes rectangular blocks (505) respectively disposed on the outer side of the upper end of the rectangular tube (501). The outer arc surface of the inflation head (200) is provided with guide grooves (506) near each rectangular block (505). The rectangular blocks (505) are respectively in the guide grooves (506) located on the same side. The inflation head (200) is movably fitted with a threaded sleeve (507). The connecting pipe (100) is also provided with a limiting component that cooperates with the threaded sleeve (507).

3. The transformer leakage detection device as described in claim 2, characterized in that: The sealing mechanism also includes springs (508) respectively disposed between the rectangular tube (501) and its chamber (500).

4. The transformer leakage detection device as described in claim 2, characterized in that: The limiting component includes a retaining ring (600) disposed outside the inflation head (200), and the outer arc surface of the retaining ring (600) is threadedly connected to a limiting ring (601).

5. The transformer leakage detection device as described in claim 1, characterized in that: A valve (300) is provided inside the connecting pipe (100) at a distance from the pressure gauge (400).

6. The transformer leakage detection device as described in claim 4, characterized in that: The diameter of the fixing ring (600) is smaller than the upper inner diameter of the threaded sleeve (507), and the diameter of the limiting ring (601) is larger than the upper inner diameter of the threaded sleeve (507).

7. The transformer leakage detection device as described in claim 2, characterized in that: The outer ends of the rectangular block (505) all extend into the threaded sleeve (507).

Images