Explosion-proof device for oil-immersed transformer

Abstract

The invention discloses an oil-immersed transformer explosion-proof device which comprises a transformer body and a transfer box, and relates to the technical field of transformers. According to the explosion-proof device for the oil-immersed transformer, the explosion-proof mechanism, the filtering mechanism and the blockage dredging mechanism are arranged between the transfer box and the transformer body, so that when the internal pressure of the device is too high, the pressure in the transformer body can be quickly reduced through cooperation of the explosion-proof mechanism, the filtering mechanism and the blockage dredging mechanism; the transformer oil is synchronously subjected to nitrogen charging, fire and explosion hidden dangers are inhibited, the transformer oil is synchronously filtered, the problems that due to the fact that conductive impurities exist in the oil, the insulating property of the transformer oil is reduced, and partial discharge and heat generation are possibly caused when a local electric field is concentrated are solved, and continuous back flushing is synchronously carried out on the filter element for filtering the oil, so that the service life of the transformer oil is prolonged. And filter holes of the filter element are kept unobstructed.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and particularly to an explosion-proof device for an oil-immersed transformer. Background Art

[0002] The oil-immersed transformer uses oil as the main insulation and cooling means. Its main components include an iron core, windings, an oil tank, an oil conservator, a breather, etc. The iron core adopts a core type structure with oil channels inside for oil circulation; the windings are the key components for the transformer to transmit electrical energy; the oil tank is used to hold the transformer oil and other components; the oil conservator can buffer the thermal expansion and contraction of the oil.

[0003] Although the oil-immersed transformer can facilitate insulation and heat dissipation through transformer oil, inevitably, during its actual use, there are still deficiencies. Among them, the device lacks an explosion-proof mechanism, resulting in the device being affected by lightning overvoltage, switching overvoltage, overload, insulation layer aging, transformer oil moisture absorption or oil acidolysis, etc., leading to a decrease in insulation level. Once the insulation layer breaks down, phase-to-phase, turn-to-turn short circuits or grounding will occur inside the transformer, causing an arc. The arc decomposes the transformer oil to generate a large amount of gas, and the oil temperature and pressure increase suddenly, which may trigger a fire and explosion. Therefore, an explosion-proof device for an oil-immersed transformer is proposed to solve the existing problems. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an explosion-proof device for an oil-immersed transformer, which solves the problem that the transformer in the device may cause a fire and explosion due to oil thermal cracking.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: An explosion-proof device for an oil-immersed transformer includes a transformer body and a transfer box. The transfer box is fixedly arranged at the bottom of the transformer body through a bracket. The top of the transfer box is communicated with a transfer cylinder. The top of the transfer box is fixedly connected with an oil transfer pump through a bracket. The inlet end of the oil transfer pump is communicated with the transformer body through an oil inlet pipe, and the outlet end of the oil transfer pump is communicated with the top of the transfer box through a pipeline. An oil outlet pipe is communicated between the top of the transfer cylinder and the front side of the transformer body. An explosion-proof mechanism is arranged on the surface of the transfer box, a filtering mechanism is arranged inside the transfer box, and a clogging removal mechanism is arranged at the bottom of the transfer box.

[0006] Preferably, the explosion-proof mechanism includes a transfer pump, which is fixedly arranged on one side of the transfer tank through a bracket. The outlet end of the transfer pump is communicated with an annular pipe, and the annular pipe is communicated with the transfer cylinder through a plurality of branch pipes. A gas storage tank is fixedly connected to the front side of the transfer tank, and the gas storage tank and the inlet end of the transfer pump are communicated through an intake pipe. A driving motor is fixedly connected to the bottom of the transfer tank through a bracket. The output shaft of the driving motor is fixedly connected to a stirring shaft through a coupling, and one end of the stirring shaft penetrates through the transfer tank and extends into the transfer cylinder. A plurality of stirring blades are fixedly connected to the surface of the stirring shaft at equal intervals in a circumferential manner.

[0007] Preferably, the filtering mechanism includes a filter element, which is rotatably arranged inside the transfer tank, and the bottom of the filter element extends to the bottom of the transfer tank. A sealing plate is installed inside the filter element through bolts. A rotating rod is rotatably arranged inside the sealing plate. A hollow scraping plate is fixedly connected to the surface of the rotating rod through a bracket. A vertical cleaning scraping plate matching with the filter element is fixedly connected to the bottom of the hollow scraping plate. Belt pulleys are fixedly connected to the surfaces of the filter element and the stirring shaft respectively, and a belt is connected between the two belt pulleys in a transmission manner.

[0008] Preferably, the clogging removal mechanism includes an oil delivery box, which is fixedly arranged at the bottom of the transfer tank through a bracket. A rotating shaft is rotatably arranged between the top and the bottom of the inner cavity of the oil delivery box, and two rotating shafts are symmetrically arranged. First gears are fixedly connected to the surfaces of the rotating shafts, and the two first gears are meshed with each other. One end of the rotating shaft on the right side extends to the top of the oil delivery box. A second gear is fixedly connected to the surface of the rotating shaft on the right side. A third gear meshing with the second gear is fixedly connected to the surface of the filter element. An oil suction pipe is communicated between the rear side of the oil delivery box and the bottom of the transfer tank. An oil spray pipe is communicated with the front side of the oil delivery box, and one end of the oil spray pipe extends into the transfer tank and is fixedly connected to the top of the inner cavity of the transfer tank.

[0009] Preferably, a plurality of convex blocks are fixedly connected to the top of the hollow scraping plate at equal intervals in a circumferential manner. A plurality of grooves matching with the convex blocks are arranged at equal intervals in a circumferential manner at the top of the inner cavity of the transfer tank and inside the filter element.

[0010] Preferably, a pressure sensor is fixedly arranged on the top of the transformer body. A central processor is arranged on the front side of the transfer tank.

[0011] Preferably, a heat exchange coil pipe is fixedly connected to the surface of the transfer cylinder.

[0012] Preferably, a pressure relief valve is arranged on the top of the transformer body.

[0013] Beneficial effects The present invention provides an explosion-proof device for an oil-immersed transformer. Compared with the existing technologies, the following beneficial effects are achieved: (1) The explosion-proof device for the oil-immersed transformer, by arranging an explosion-proof mechanism, a filtering mechanism and a clogging prevention and dredging mechanism between the transfer box and the transformer body, enables the device to cooperate with each other through the explosion-proof mechanism, the filtering mechanism and the clogging prevention and dredging mechanism. When the internal pressure of the device is too high, through the above-mentioned cooperation, the pressure in the transformer body can be quickly reduced, and nitrogen is filled into the transformer oil synchronously to inhibit the occurrence of fire and explosion hazards. At the same time, the transformer oil is filtered synchronously to avoid the problem that the insulating performance of the transformer oil is reduced due to the existence of conductive impurities in the oil, and local discharge may be caused when the local electric field is concentrated, generating heat. And the filter element for filtering the oil quality is continuously backflushed synchronously to keep the filter holes of the filter element unblocked.

[0014] (2) The explosion-proof device for the oil-immersed transformer, by installing a sealing plate inside the filter element and arranging a hollow scraping plate at the top of the rotating rod, when the impurities inside the filter element need to be taken out and processed regularly, through the disassembly and separation of the sealing plate and the filter element, the sealing plate and the hollow scraping plate can be dragged downward, so that the hollow scraping plate can scrape out the impurities inside and on the inner wall of the filter element.

[0015] (3) The explosion-proof device for the oil-immersed transformer, by arranging a heat exchange coil on the surface of the transfer cylinder, enables the transformer oil inside the transfer box to be indirectly heated by passing water through the heat exchange coil during the process of nitrogen filling and transfer, so as to reduce the oil temperature.

[0016] (4) The explosion-proof device for the oil-immersed transformer, by arranging bumps and grooves between the hollow scraping plate and the transfer box, enables the vertical cleaning scraping plate to be easily limited through the positioning cooperation of the bumps and grooves. Brief Description of the Drawings

[0017] Figure 1 is a schematic diagram of the external structure of the present invention; Figure 2 is a schematic diagram of the structure of the transfer box of the present invention; Figure 3 is a schematic diagram of the structure of the explosion-proof mechanism of the present invention; Figure 4 is a schematic diagram of the internal structure of the transfer box of the present invention; Figure 5 is a schematic diagram of the internal structure of the filter element of the present invention; Figure 6 is a schematic diagram of the groove structure of the present invention; Figure 7 is a schematic diagram of the structure of the fuel injection pipe of the present invention; Figure 8 is a schematic diagram of the structure of the clogging prevention and dredging mechanism of the present invention; Figure 9 is a schematic diagram of the internal structure of the oil transfer box of the present invention.

[0018] In the figure: 1. Transformer body; 2. Transfer box; 3. Transfer cylinder; 4. Oil transfer pump; 5. Inlet pipe; 6. Outlet pipe; 7. Explosion-proof mechanism; 701. Delivery pump; 702. Loop pipe; 703. Gas storage tank; 704. Inlet gas pipe; 705. Driving motor; 706. Stirring shaft; 707. Stirring blade; 8. Filter mechanism; 801. Filter element; 802. Sealing plate; 803. Rotating rod; 804. Hollow scraping plate; 805. Vertical cleaning scraping plate; 806. Pulley; 807. Belt; 808. Protrusion; 809. Groove; 9. Blockage removal mechanism; 901. Oil transfer box; 902. Rotating shaft; 903. First gear; 904. Second gear; 905. Third gear; 906. Oil suction pipe; 907. Oil spray pipe; 10. Pressure sensor; 11. Central processing unit; 12. Heat exchange coil; 13. Pressure relief valve. Detailed implementation manner

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] Please refer to Figures 1-9 , the present invention provides a technical solution: an explosion-proof device for an oil-immersed transformer, including a transformer body 1 and a transfer box 2. The transfer box 2 is fixedly arranged at the bottom of the transformer body 1 through a bracket. The top of the transfer box 2 is communicated with a transfer cylinder 3. The top of the transfer box 2 is fixedly connected with an oil transfer pump 4 through a bracket. The inlet end of the oil transfer pump 4 is communicated with the transformer body 1 through an inlet pipe 5. The outlet end of the oil transfer pump 4 is communicated with the top of the transfer box 2 through a pipeline. The top of the transfer cylinder 3 is communicated with the front side of the transformer body 1 through an outlet pipe 6. A pressure sensor 10 is fixedly arranged at the top of the transformer body 1. A central processing unit 11 is arranged on the front side of the transfer box 2. A heat exchange coil 12 is fixedly connected to the surface of the transfer cylinder 3. A pressure relief valve 13 is arranged at the top of the transformer body 1.

[0021] As a preferred embodiment, in order to facilitate nitrogen filling and explosion-proof for the transfer box 2, an explosion-proof mechanism 7 is arranged on the surface of the transfer box 2. The explosion-proof mechanism 7 includes a delivery pump 701. The delivery pump 701 is fixedly arranged on one side of the transfer box 2 through a bracket. The outlet end of the delivery pump 701 is communicated with a loop pipe 702, and the loop pipe 702 is communicated with the transfer cylinder 3 through a plurality of branch pipelines. A gas storage tank 703 is fixedly connected to the front side of the transfer box 2, and the gas storage tank 703 and the inlet end of the delivery pump 701 are communicated through an inlet gas pipe 704. The bottom of the transfer box 2 is fixedly connected with a driving motor 705 through a bracket. The output shaft of the driving motor 705 is fixedly connected with a stirring shaft 706 through a coupling, and one end of the stirring shaft 706 penetrates through the transfer box 2 and extends into the transfer cylinder 3. A plurality of stirring blades 707 are fixedly connected to the surface of the stirring shaft 706 at equal intervals in a surrounding manner.

[0022] As a preferred embodiment, for the convenience of filtering impurities in transformer oil, a filtering mechanism 8 is arranged inside the transfer box 2. The filtering mechanism 8 includes a filter element 801. The filter element 801 is rotatably arranged inside the transfer box 2, and the bottom of the filter element 801 extends to the bottom of the transfer box 2. A sealing plate 802 is installed inside the filter element 801 through bolts. A rotating rod 803 is rotatably arranged inside the sealing plate 802. A hollow scraping plate 804 is fixedly connected to the surface of the rotating rod 803 through a bracket. A vertical cleaning scraping plate 805 used in cooperation with the filter element 801 is fixedly connected to the bottom of the hollow scraping plate 804. Pulley 806 is fixedly connected to the surfaces of both the filter element 801 and the stirring shaft 706. A belt 807 is drivingly connected between the two pulleys 806; A number of convex blocks 808 are fixedly connected to the top of the hollow scraping plate 804 at equal intervals around the circumference. A number of grooves 809 used in cooperation with the convex blocks 808 are opened at equal intervals around the circumference inside the top cavity of the transfer box 2 and located inside the filter element 801. As a detailed explanation: A rubber ring gasket is arranged on the outer surface of the hollow scraping plate 804 for extrusion and fitting scraping with the filter element 801.

[0023] As a preferred embodiment, for the convenience of dredging the filter holes of the filter element 801, a dredging mechanism 9 is arranged at the bottom of the transfer box 2. The dredging mechanism 9 includes an oil transfer box 901. The oil transfer box 901 is fixedly arranged at the bottom of the transfer box 2 through a bracket. A rotating shaft 902 is rotatably arranged between the top and bottom of the inner cavity of the oil transfer box 901, and two rotating shafts 902 are symmetrically arranged. A first gear 903 is fixedly connected to the surface of the rotating shaft 902, and the two first gears 903 mesh with each other. One end of the rotating shaft 902 on the right side extends to the top of the oil transfer box 901. A second gear 904 is fixedly connected to the surface of the rotating shaft 902 on the right side. A third gear 905 meshing with the second gear 904 is fixedly connected to the surface of the filter element 801. An oil suction pipe 906 is communicated between the rear side of the oil transfer box 901 and the bottom of the transfer box 2. A spray oil pipe 907 is communicated with the front side of the oil transfer box 901, and one end of the spray oil pipe 907 extends into the transfer box 2 and is fixedly connected to the top of the inner cavity of the transfer box 2. As a detailed explanation: A number of spray holes are opened on the surface of the spray oil pipe 907.

[0024] The specific enabling steps are as follows: Pre - connect the on - site circulating water with the heat exchange coil 12 in advance; After the pressure sensor 10 detects that the internal pressure of the transformer body 1 exceeds the preset value, it sends a signal to the central processing unit 11. The central processing unit 11 controls the self-start of the oil transfer pump 4, the transfer pump 701 and the drive motor 705. The oil transfer pump 4 starts to pump the transformer oil inside the transformer body 1 to the inside of the transfer tank 2 through the inlet pipe 5. After part of the transformer oil is transferred to the inside of the transfer tank 2, the internal pressure of the transformer body 1 is promptly reduced. As the inside of the transfer tank 2 is filled with transformer oil, the transformer oil is sent back to the inside of the transformer body 1 through the outlet pipe 6; When the transfer pump 701 starts, it uses the intake pipe 704 and the annular pipe 702 to send the nitrogen gas stored in the gas storage tank 703 into the inside of the transfer cylinder 3. When the drive motor 705 starts, it drives the stirring shaft 706 and the stirring blade 707 to rotate. The rotation of the stirring blade 707 stirs the mixture of transformer oil and nitrogen gas and sends them into the inside of the transformer body 1 together, which plays a role in isolating oxygen, suppressing the hidden dangers of fire and explosion, and suppressing the thermal cracking of the transformer oil. During the process of flushing nitrogen into the transformer oil, the circulating water flowing inside the heat exchange coil 12 is used to cool the oil temperature synchronously; During the process of the transformer oil in the transformer body 1 entering the inside of the transfer tank 2, the transformer oil first enters the inside of the filter element 801 and is filtered from the inside to the outside through the filter holes on the surface of the filter element 801. When the drive motor 705 drives the stirring shaft 706 to rotate synchronously, the stirring shaft 706 drives the filter element 801 to rotate through the transmission cooperation of the pulley 806 and the belt 807. When the filter element 801 rotates, its inner wall is scraped with the vertical cleaning scraper 805, so that the impurities attached to the inner wall of the filter element 801 are promptly separated; When the filter element 801 rotates, it meshes the driving third gear 905 with the second gear 904, so that the second gear 904 drives the right shaft 902 and the first gear 903 to rotate. The right first gear 903 meshes with the left first gear 903 synchronously, and then the oil suction pipe 906 introduces the transformer oil inside the transfer tank 2 into the inside of the oil delivery box 901 and conveys it under pressure through the meshing of the two first gears 903, so that the spray pipe 907 sprays the transformer oil inside the oil delivery box 901 onto the surface of the filter element 801, and then flushes the filter holes of the filter element 801 from the outside to the inside, so that the impurities inside the filter holes of the filter element 801 return to the inside of the filter element 801 again.

Claims

1. An explosion-proof device for an oil-immersed transformer, comprising a transformer body (1) and a transfer box (2), wherein the transfer box (2) is fixedly arranged at the bottom of the transformer body (1) through a bracket, and is characterized in that: The top of the transfer tank (2) is communicated with a transfer cylinder (3). The top of the transfer tank (2) is fixedly connected with an oil transfer pump (4) through a bracket. The inlet end of the oil transfer pump (4) is communicated with the transformer body (1) through an oil inlet pipe (5). The outlet end of the oil transfer pump (4) is communicated with the top of the transfer tank (2) through a pipeline. An oil outlet pipe (6) is communicated between the top of the transfer cylinder (3) and the front side of the transformer body (1). An explosion-proof mechanism (7) is arranged on the surface of the transfer tank (2). A filtering mechanism (8) is arranged inside the transfer tank (2). A clogging removal mechanism (9) is arranged at the bottom of the transfer tank (2).

2. The oil-immersed transformer explosion-proof device according to claim 1, characterized in that: The explosion-proof mechanism (7) includes a transfer pump (701). The transfer pump (701) is fixedly arranged on one side of the transfer tank (2) through a bracket. The outlet end of the transfer pump (701) is communicated with an annular pipe (702). The annular pipe (702) is communicated with the transfer cylinder (3) through a plurality of branch pipes. A gas storage tank (703) is fixedly connected to the front side of the transfer tank (2). The gas storage tank (703) and the inlet end of the transfer pump (701) are communicated through an air inlet pipe (704). A driving motor (705) is fixedly connected to the bottom of the transfer tank (2) through a bracket. The output shaft of the driving motor (705) is fixedly connected with a stirring shaft (706) through a coupling. One end of the stirring shaft (706) penetrates through the transfer tank (2) and extends into the transfer cylinder (3). A plurality of stirring blades (707) are fixedly connected to the surface of the stirring shaft (706) at equal intervals in a circumferential manner.

3. The oil-immersed transformer explosion-proof device according to claim 2, wherein: The filtering mechanism (8) includes a filter element (801). The filter element (801) is rotatably arranged inside the transfer tank (2). The bottom of the filter element (801) extends to the bottom of the transfer tank (2). A sealing plate (802) is installed inside the filter element (801) through bolts. A rotating rod (803) is rotatably arranged inside the sealing plate (802). A hollow scraping plate (804) is fixedly connected to the surface of the rotating rod (803) through a bracket. A vertical cleaning scraping plate (805) which is used in a matching manner with the filter element (801) is fixedly connected to the bottom of the hollow scraping plate (804). Pulley wheels (806) are fixedly connected to the surfaces of the filter element (801) and the stirring shaft (706). A belt (807) is connected in a transmission manner between the two pulley wheels (806).

4. The explosion-proof device for an oil-immersed transformer according to claim 3, wherein: The plugging and unplugging mechanism (9) includes an oil delivery box (901). The oil delivery box (901) is fixedly arranged at the bottom of the transfer box (2) through a bracket. A rotating shaft (902) is rotatably arranged between the top and the bottom of the inner cavity of the oil delivery box (901), and two rotating shafts (902) are symmetrically arranged. A first gear (903) is fixedly connected to the surface of the rotating shaft (902), and the two first gears (903) are meshed with each other. One end of the rotating shaft (902) on the right side extends to the top of the oil delivery box (901). A second gear (904) is fixedly connected to the surface of the rotating shaft (902) on the right side. A third gear (905) meshed with the second gear (904) is fixedly connected to the surface of the filter element (801). An oil suction pipe (906) is communicated between the rear side of the oil delivery box (901) and the bottom of the transfer box (2). A fuel injection pipe (907) is communicated with the front side of the oil delivery box (901), and one end of the fuel injection pipe (907) extends into the transfer box (2) and is fixedly connected to the top of the inner cavity of the transfer box (2).

5. The explosion-proof device for an oil-immersed transformer according to claim 3, characterized in that: A plurality of convex blocks (808) are fixedly connected to the top of the hollow scraper (804) at equal intervals in a surrounding manner. A plurality of grooves (809) matched with the convex blocks (808) are formed at equal intervals in a surrounding manner at the top of the inner cavity of the transfer box (2) and inside the filter element (801).

6. The explosion-proof device of an oil-immersed transformer according to claim 1, wherein: A pressure sensor (10) is fixedly arranged at the top of the transformer body (1). A central processing unit (11) is arranged at the front side of the transfer box (2).

7. An explosion-proof device for an oil-immersed transformer according to claim 1, characterized in that: A heat exchange coil pipe (12) is fixedly connected to the surface of the transfer cylinder (3).

8. An explosion-proof device for an oil-immersed transformer according to claim 1, characterized in that: A pressure relief valve (13) is arranged at the top of the transformer body (1).

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