An oil-immersed transformer

Abstract

The present invention belongs to the technical field of transformers, and particularly relates to an oil-immersed transformer, which includes a transformer housing. A sealing cover is detachably connected to the top of the transformer housing. An oil conservator mechanism and an air exhaust mechanism are arranged above the sealing cover. An accelerating flow assembly is arranged below the air exhaust mechanism. The air exhaust mechanism includes an air extraction assembly, and the air extraction assembly is arranged above the sealing cover. Among them, the air extraction assembly includes an air chamber, and a piston in the air chamber is connected to a piston member. Through the use of the oil conservator mechanism and the air exhaust mechanism, when the insulating oil in the transformer housing expands and contracts thermally, the insulating oil can flow through the oil inlet pipe and the return pipe. During this process, the impeller drives the cam to rotate, causing the piston member to move reciprocally left and right, realizing the discharge of air in the fuel tank, thereby preventing the insulating oil from undergoing an oxidation reaction with air, extending the service time of the insulating oil, and ensuring the use effect of the insulating oil.

Description

Technical Field

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

[0002] The housing of an oil-immersed transformer contains insulating oil, which is used to absorb the heat generated during the operation of the transformer and then transfer the heat to the radiator fins of the housing through heat transfer for heat dissipation. Among them, the oil conservator of the oil-immersed transformer adjusts the oil volume in the transformer oil tank to ensure that the transformer is filled with oil under any temperature and operating conditions. When the transformer oil temperature rises, the oil volume expands, and the excess oil will flow into the oil conservator; conversely, when the oil temperature drops, the oil volume shrinks, and the oil in the oil conservator will flow back into the oil tank, thus playing a role in automatically adjusting the oil level.

[0003] Currently, a desiccant is provided on the oil conservator in the prior art to absorb moisture in the air and prevent impurities from entering the insulating oil. However, as the transformer continues to be used, air will enter the oil conservator, which will cause the insulating oil to react with the air, thereby affecting the use of the insulating oil. Therefore, after the insulating oil is used for a period of time, it needs to be replaced. In order to extend the service life of the insulating oil and improve its use effect, we propose an oil-immersed transformer. Summary of the Invention

[0004] The main object of the present invention is to provide an oil-immersed transformer that can solve the problems raised in the above background art.

[0005] To achieve the above object, the oil-immersed transformer proposed by the present invention includes a transformer housing. A sealing cover is detachably connected to the top of the transformer housing. An oil conservator mechanism and an air exhaust mechanism are arranged above the sealing cover. An acceleration flow component is arranged below the air exhaust mechanism. The air exhaust mechanism includes:

[0006] An air extraction component, which is arranged above the sealing cover;

[0007] Among them, the air extraction component includes an air chamber. A piston in the air chamber is connected to a piston member. One side of the piston member close to the oil conservator mechanism is fixedly connected to a straight rod. The piston member is elastically connected to the inner wall of the air chamber through a return spring. The end of the straight rod away from the piston member is fixedly connected to a square plate;

[0008] An air extraction pipe, which is communicated with the air chamber;

[0009] And an exhaust pipe, which is communicated with the air chamber. A three-way valve is arranged on the exhaust pipe.

[0010] Preferably, check valves are provided at both ends of the air extraction pipe and the exhaust pipe in the air chamber. Through the check valve of the air extraction pipe, the gas in the air extraction pipe can only enter the air chamber. Through the check valve of the exhaust pipe, the gas in the air chamber can only be discharged to the exhaust pipe. By reciprocating the piston member in the air chamber, the air in the fuel tank can be sucked into the air extraction pipe and then enter the air chamber through the check valve. When the piston member moves away from the fuel inlet pipe, the sucked air can be discharged from the air chamber through the exhaust pipe, thereby preventing the insulating oil from reacting with air and prolonging the service life of the insulating oil.

[0011] Preferably, the oil conservator mechanism includes a fuel tank. An installation frame is fixedly connected to the outer wall of the fuel tank, and the installation frame is fixedly connected to the sealing cover. A refueling port and a waste discharge port are provided on the outer wall of the fuel tank. The fuel tank is communicated with a fuel inlet pipe, and the fuel inlet pipe is communicated with a one-way fuel inlet. The fuel tank is communicated with a return pipe, and the return pipe is communicated with a one-way fuel outlet.

[0012] Preferably, the air chamber is fixedly connected to the outer wall of the fuel inlet pipe, and the three-way valve is fixedly connected to the outer wall of the fuel tank.

[0013] Preferably, a fixing ring is fixedly connected to the inner wall of the fuel inlet pipe. A through hole is provided on the outer wall of the fixing ring. The fixing ring is penetrated by a rotating shaft and is rotatably connected to the rotating shaft. An impeller is fixedly connected to the top of the rotating shaft, and a cam is fixedly connected to the bottom of the rotating shaft. Support pieces are fixedly connected to the outer walls of the upper and lower sides of the rotating shaft in the fixing ring to limit the position of the rotating shaft and ensure the stability of the rotating shaft. The insulating oil flows through the through hole, drives the impeller to rotate, and then drives the rotating shaft to rotate, causing the cam to rotate.

[0014] Preferably, the square plate abuts against the cam under the action of the return spring.

[0015] Preferably, the acceleration flow component includes a positioning rod. The positioning rod is fixedly connected to the inner wall of the air chamber. The positioning rod penetrates through the L-shaped rotating member and is rotatably connected to the L-shaped rotating member. The L-shaped rotating member is hinged with a push rod, and one end of the push rod away from the L-shaped rotating member is hinged to the side of the piston member away from the straight rod.

[0016] Preferably, one end of the L-shaped rotating member away from the push rod is hinged with a hinge rod, one end of the hinge rod away from the L-shaped rotating member is hinged with a vertical rod, a sealing sleeve is sleeved on the outer wall of the vertical rod, a connecting rod is hinged on the outer wall of the vertical rod, one end of the connecting rod away from the vertical rod is hinged with a spoiler, the spoiler is hinged on the lower side of the sealing cover. When the cam rotates, under the action of the return spring, the square plate is driven to move left and right reciprocally, and then the piston member is driven to move reciprocally in the air chamber. During the reciprocating movement of the piston member, the push rod is driven to move, and then the L-shaped rotating member is driven to rotate around the positioning rod, the hinge rod is driven to move, the vertical rod drives the connecting rod to move, and then the spoiler is driven to move slightly, achieving the effect of disturbing the insulating oil in the transformer housing, thereby improving the heat dissipation effect of the insulating oil and accelerating the flow of the insulating oil into the transformer housing.

[0017] Preferably, the hinged part of the push rod and the piston member is higher than the hinged part of the push rod and the L-shaped rotating member. The two ends of the L-shaped rotating member are of different lengths, and the length of the end of the L-shaped rotating member connected to the push rod is greater than the length of the end of the L-shaped rotating member connected to the hinge rod, so that the force required for the L-shaped rotating member to be pushed and rotated is smaller.

[0018] Preferably, there are two groups of the sealing sleeves. One group of the sealing sleeves is fixedly connected to the outer wall of the air chamber, and the other group of the sealing sleeves is fixedly connected to the sealing cover. A heat dissipation pipe is fixedly connected to the outer wall of the transformer housing.

[0019] The present invention provides an oil-immersed transformer. It has the following beneficial effects:

[0020] (1) By using the oil conservator mechanism and the air exhausting mechanism, when the insulating oil in the transformer housing expands and contracts thermally, the insulating oil can flow through the inlet pipe and the return pipe. During this process, the impeller drives the cam to rotate, so that the piston member moves left and right reciprocally, realizing the discharge of air in the fuel tank, thereby preventing the insulating oil from undergoing an oxidation reaction with air, prolonging the service time of the insulating oil, and ensuring the use effect of the insulating oil.

[0021] (2) By using the oil conservator mechanism, the air exhausting mechanism and the accelerating flow component, during the flow of the insulating oil in the return pipe, the piston member moves left and right reciprocally, and then drives the spoiler to move slightly, achieving the effect of disturbing the insulating oil in the transformer housing, thereby improving the heat dissipation effect of the insulating oil and accelerating the flow of the insulating oil into the transformer housing.

[0022] (3) By using the oil conservator mechanism, when the insulating oil expands due to heat, due to the incompressibility of the insulating oil, the insulating oil enters the oil tank through the reflux pipe. When the insulating oil contracts, the insulating oil in the oil tank enters the transformer housing through the inlet pipe, achieving the effect of updating the insulating oil in the transformer housing while realizing the flow of the insulating oil, and improving the subsequent use effect of the insulating oil.

[0023] (4) By using the air exhaust mechanism of the oil-immersed transformer, when the staff needs to replace and clean the oil tank with insulating oil, by using a three-way valve to connect the exhaust pipe to the oil tank, during the process of the staff cleaning with new insulating oil, gas can rush into the insulating oil, improving the surging effect of the insulating oil, facilitating the insulating oil to wash away the impurities in the oil tank, and thus reducing the cleaning amount of the insulating oil to a certain extent and saving the insulating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0025] Figure 1 Schematic diagram of the overall three-dimensional structure of the present invention Figure 1 ;

[0026] Figure 2 Schematic diagram of the overall three-dimensional structure of the present invention Figure 2 ;

[0027] Figure 3 Schematic diagram of the overall partial sectional structure of the present invention;

[0028] Figure 4 For the present invention Figure 3 Schematic diagram of structure A;

[0029] Figure 5 Schematic diagram of the overall sectional structure of the present invention;

[0030] Figure 6 For the present invention Figure 5 Schematic diagram of structure B;

[0031] Figure 7 Schematic diagram of the structure of the acceleration flow component of the present invention.

[0032] Description of the reference numerals in the drawings:

[0033] 1. Transformer housing; 2. Sealing cover; 3. Conservator mechanism; 4. Air exhausting mechanism; 5. Accelerated flow assembly; 101. Heat dissipation pipe; 31. Oil tank; 32. Mounting bracket; 33. Oil filling port; 34. Impurity discharging port; 35. Inlet pipe; 36. Unidirectional inlet port; 37. Return pipe; 38. Unidirectional outlet port; 351. Fixed ring; 352. Through port; 353. Rotating shaft; 354. Impeller; 355. Cam; 41. Air extraction assembly; 42. Air extraction pipe; 43. Three-way valve; 44. Exhaust pipe; 411. Air chamber; 412. Piston part; 413. Straight rod; 414. Square plate; 51. Positioning rod; 52. L-shaped rotating part; 53. Push rod; 54. Hinge rod; 55. Vertical rod; 56. Sealing sleeve; 57. Connecting rod; 58. Turbulence plate.

[0034] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0035] 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. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1-7 , the present invention provides an oil-immersed transformer, including a transformer housing 1, a sealing cover 2 is detachably connected to the top of the transformer housing 1, a heat dissipation pipe 101 is fixedly connected to the outer wall of the transformer housing 1. The heat dissipation pipe 101 is easy to absorb heat, facilitating heat exchange, and thus effectively absorbing the internal heat in the transformer housing 1, and then reducing the heat in the transformer housing 1 through external heat exchange. Above the sealing cover 2, there are arranged a conservator mechanism 3 and an air exhausting mechanism 4, and below the air exhausting mechanism 4, there is arranged an accelerated flow assembly 5.

[0037] In an embodiment of the present invention, in order to enable the insulating oil in the transformer housing 1 to flow and exchange during the operation of the device, specifically, the conservator mechanism 3 includes an oil tank 31. A mounting frame 32 is fixedly connected to the outer wall of the oil tank 31, and the mounting frame 32 is fixedly connected to the sealing cover 2. A refueling port 33 and a debris discharge port 34 are provided on the outer wall of the oil tank 31. The oil tank 31 is communicated with an oil inlet pipe 35, and the oil inlet pipe 35 is communicated with a one-way oil inlet 36. The oil tank 31 is communicated with a return pipe 37, and the return pipe 37 is communicated with a one-way oil outlet 38. When the insulating oil in the transformer housing 1 expands due to heat, due to the incompressibility of the insulating oil, the insulating oil enters the one-way oil outlet 38 and then enters the oil tank 31 through the return pipe 37. After the transformer stops working, the temperature of the insulating oil in the transformer housing 1 gradually decreases, and thus the insulating oil shrinks. The insulating oil in the oil tank 31 enters the transformer housing 1 through the oil inlet pipe 35 and the one-way oil inlet 36, achieving the effect of updating the insulating oil in the transformer housing 1 while realizing the flow of the insulating oil, and improving the subsequent use effect of the insulating oil.

[0038] Further, in order to discharge the air in the fuel tank 31, prevent the oxidation reaction between the insulating oil and the air, and extend the service time of the insulating oil. Specifically, a fixing ring 351 is fixedly connected to the inner wall of the inlet pipe 35. A through port 352 is formed on the outer wall of the fixing ring 351. The fixing ring 351 is penetrated by a rotating shaft 353 and is rotatably connected to the rotating shaft 353. An impeller 354 is fixedly connected to the top of the rotating shaft 353, and a cam 355 is fixedly connected to the bottom of the rotating shaft 353. When the insulating oil flows into the transformer housing 1 through the inlet pipe 35, the insulating oil flows through the through port 352, drives the impeller 354 to rotate, and then drives the rotating shaft 353 to rotate, so that the cam 355 rotates. Support pieces are fixedly connected to the outer walls of the upper and lower sides of the rotating shaft 353 with respect to the fixing ring 351 to limit the position of the rotating shaft 353 and ensure the stability of the rotating shaft 353. The air exhausting mechanism 4 includes an air extraction assembly 41, an air extraction pipe 42 and an exhaust pipe 44. The air extraction assembly 41 is arranged above the sealing cover 2. The air extraction pipe 42 is communicated with an air chamber 411. The air chamber 411 is fixedly connected to the outer wall of the inlet pipe 35. The exhaust pipe 44 is communicated with the air chamber 411. A three-way valve 43 is arranged on the exhaust pipe 44. The three-way valve 43 is fixedly connected to the outer wall of the fuel tank 31. Among them, the air extraction assembly 41 includes an air chamber 411. A piston member 412 is connected to the piston in the air chamber 411. There is no air between the side of the piston member 412 close to the inlet pipe 35 and the air chamber 411, so that the piston member 412 can move in the air chamber 411 towards the inlet pipe 35. A straight rod 413 is fixedly connected to the side of the piston member 412 close to the oil pillow mechanism 3. The piston member 412 is elastically connected to the inner wall of the air chamber 411 through a return spring. One end of the straight rod 413 away from the piston member 412 is fixedly connected to a square plate 414. One-way valves are arranged at the ends of the air extraction pipe 42 and the exhaust pipe 44 located in the air chamber 411. Through the one-way valve of the air extraction pipe 42, the gas in the air extraction pipe 42 can only enter the air chamber 411. Through the one-way valve of the exhaust pipe 44, the gas in the air chamber 411 can only be discharged to the exhaust pipe 44. The square plate 414 abuts against the cam 355 under the action of the return spring. By turning the switch of the three-way valve 43, the exhaust pipe 44 is not communicated with the fuel tank 31. At this time, when the insulating oil flows into the transformer housing 1 through the inlet pipe 35, the cam 355 rotates. Under the action of the return spring, it drives the square plate 414 to move left and right reciprocally, and then drives the piston member 412 to move reciprocally in the air chamber 411. The air in the fuel tank 31 can be sucked into the air extraction pipe 42 and then enter the air chamber 411 through the one-way valve. When the piston member 412 moves in the direction away from the inlet pipe 35, the sucked air can be discharged from the air chamber 411 through the exhaust pipe 44, thereby preventing the oxidation reaction between the insulating oil and the air, extending the service time of the insulating oil, and ensuring the use effect of the insulating oil.

[0039] Furthermore, in order to accelerate the return of the insulating oil to the transformer housing 1, specifically, the accelerating flow assembly 5 includes a positioning rod 51 fixedly connected to the inner wall of the air chamber 411. The positioning rod 51 passes through the L-shaped rotating member 52 and is rotatably connected to the L-shaped rotating member 52. The L-shaped rotating member 52 is hinged with a push rod 53. One end of the push rod 53 away from the L-shaped rotating member 52 is hinged to the side of the piston member 412 away from the straight rod 413. One end of the L-shaped rotating member 52 away from the push rod 53 is hinged with a hinged rod 54. One end of the hinged rod 54 away from the L-shaped rotating member 52 is hinged with a vertical rod 55. A sealing sleeve 56 is sleeved on the outer wall of the vertical rod 55. There are two groups of sealing sleeves 56. One group of sealing sleeves 56 is fixedly connected to the outer wall of the air chamber 411, and the other group of sealing sleeves 56 is fixedly connected to the sealing cover 2. A connecting rod 57 is hinged on the outer wall of the vertical rod 55. One end of the connecting rod 57 away from the vertical rod 55 is hinged with a spoiler 58. The spoiler 58 is hinged under the sealing cover 2. The hinge joint of the push rod 53 and the piston member 412 is higher than the hinge joint of the push rod 53 and the L-shaped rotating member 52. During the reciprocating motion of the piston member 412, the push rod 53 is driven to move, and then the L-shaped rotating member 52 is driven to rotate around the positioning rod 51, driving the hinged rod 54 to move, so that the vertical rod 55 drives the connecting rod 57 to move, and then the spoiler 58 is driven to move slightly, achieving the effect of disturbing the insulating oil in the transformer housing 1, thereby improving the heat dissipation effect of the insulating oil and accelerating the flow of the insulating oil into the transformer housing 1.

[0040] Moreover, the two ends of the L-shaped rotating member 52 are of different lengths. The end of the L-shaped rotating member 52 connected to the push rod 53 is longer than the end of the L-shaped rotating member 52 connected to the hinged rod 54, so that the force required for the L-shaped rotating member 52 to be pushed and rotated is smaller.

[0041] In addition, when the staff needs to replace and clean the insulating oil in the fuel tank 31, by turning the switch of the three-way valve 43, the exhaust pipe 44 is communicated with the fuel tank 31. During the process of the staff cleaning with new insulating oil, the insulating oil flows in the inlet pipe 35, and the piston member 412 reciprocates, causing the air in the fuel tank 31 to circulate. The gas can rush into the insulating oil, improving the surging effect of the insulating oil, facilitating the insulating oil to wash away the impurities in the lower fuel tank 31, and thus reducing the cleaning amount of the insulating oil to a certain extent and saving the insulating oil.

[0042] It should be noted that various electrical components are provided on the sealing cover 2, and the electrical components are all existing technical products. Those skilled in the art select, install and complete the circuit debugging operation according to the usage needs to ensure that each electrical appliance can work normally. The components are all common standard parts or parts known to those skilled in the art, and their structures and principles can all be known by those skilled in the art through technical manuals, and no specific limitations are made here.

[0043] During use, first turn the switch of the three-way valve 43 to disconnect the exhaust pipe 44 from the fuel tank 31. When the insulating oil in the transformer housing 1 expands due to heat, due to the incompressibility of the insulating oil, the insulating oil enters the one-way oil outlet 38 and then enters the fuel tank 31 through the return pipe 37. After the transformer stops working, the temperature of the insulating oil in the transformer housing 1 gradually decreases, and then the insulating oil contracts. The insulating oil in the fuel tank 31 enters the transformer housing 1 through the oil inlet pipe 35 and the one-way oil inlet 36, realizing the flow of the insulating oil while updating the insulating oil in the transformer housing 1;

[0044] At the same time, during the process of the insulating oil flowing into the transformer housing 1 through the oil inlet pipe 35, the insulating oil flows through the through-port 352, drives the impeller 354 to rotate, and then drives the rotating shaft 353 to rotate, causing the cam 355 to rotate. Under the action of the return spring, it drives the square plate 414 to move reciprocally left and right, and then drives the piston member 412 to move reciprocally in the air chamber 411. The air in the fuel tank 31 can be sucked into the air extraction pipe 42 and then enter the air chamber 411 through the one-way valve. When the piston member 412 moves away from the oil inlet pipe 35, the inhaled air can be discharged from the air chamber 411 through the exhaust pipe 44;

[0045] At the same time, during the reciprocating movement of the piston member 412, it drives the push rod 53 to move, and then drives the L-shaped rotating member 52 to rotate around the positioning rod 51, drives the articulated rod 54 to move, and makes the vertical rod 55 drive the connecting rod 57 to move, and then drives the spoiler 58 to move slightly, realizing the disturbance of the insulating oil in the transformer housing 1;

[0046] Moreover, when the staff needs to replace the insulating oil, by turning the switch of the three-way valve 43 to connect the exhaust pipe 44 with the fuel tank 31, during the process of the staff cleaning with new insulating oil, the insulating oil flows in the oil inlet pipe 35, and the piston member 412 moves reciprocally, enabling the air in the fuel tank 31 to circulate. The gas can rush into the insulating oil, causing the insulating oil to surge, which is convenient for the insulating oil to wash away the impurities in the fuel tank 31.

[0047] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An oil-immersed transformer, comprising a transformer housing (1), characterized in that: The top of the transformer housing (1) is detachably connected to a sealing cover (2); an oil pillow mechanism (3) and an air exhaust mechanism (4) are arranged above the sealing cover (2); a flow acceleration component (5) is arranged below the air exhaust mechanism (4); and the air exhaust mechanism (4) comprises: An air extraction component (41), wherein the air extraction component (41) is arranged above the sealing cover (2); The air extraction assembly (41) comprises an air bin (411), a piston in the air bin (411) is connected to a piston member (412), a side of the piston member (412) close to the oil pillow mechanism (3) is fixedly connected to a straight rod (413), the piston member (412) is elastically connected to the inner wall of the air bin (411) via a return spring, and an end of the straight rod (413) away from the piston member (412) is fixedly connected to a square plate (414); An air extraction pipe (42), wherein the air extraction pipe (42) is in communication with the air chamber (411); and an exhaust pipe (44), wherein the exhaust pipe (44) is in communication with the gas chamber (411), and a three-way valve (43) is provided on the exhaust pipe (44); The accelerating flow component (5) comprises a positioning rod (51), wherein the positioning rod (51) is fixedly connected to the inner wall of the gas chamber (411), the positioning rod (51) passes through the L-shaped rotating member (52) and is rotatably connected to the L-shaped rotating member (52), the L-shaped rotating member (52) is hinged with a push rod (53), one end of the push rod (53) away from the L-shaped rotating member (52) is hinged to a side of the piston member (412) away from the straight rod (413), and the end of the L-shaped rotating member (52) away from the push rod (53) is hinged to the side of the piston member (412) away from the straight rod (413). A hinged rod (54) is hingedly connected, and one end of the hinged rod (54) away from the L-shaped rotating member (52) is hingedly connected to a vertical rod (55), and a sealing sleeve (56) is sleeved on the outer wall of the vertical rod (55), and a connecting rod (57) is hingedly connected to the outer wall of the vertical rod (55), and one end of the connecting rod (57) away from the vertical rod (55) is hingedly connected to a spoiler (58), and the spoiler (58) is hinged on the lower side of the sealing cover (2), and the hinge point between the push rod (53) and the piston member (412) is higher than the hinge point between the push rod (53) and the L-shaped rotating member. The oil pillow mechanism (3) comprises an oil tank (31), a mounting frame (32) is fixedly connected to the outer wall of the oil tank (31), and the mounting frame (32) is fixedly connected to the sealing cover (2), an oil replenishment port (33) and a debris discharge port (34) are opened on the outer wall of the oil tank (31), the oil tank (31) is connected to an oil inlet pipe (35), the oil inlet pipe (35) is connected to the one-way oil inlet port (36), the oil tank (31) is connected to a return pipe (37), the return pipe (37) is connected to the one-way oil outlet port (36), and the return pipe (37) is connected to the one-way oil outlet port (37). The oil port (38) is connected, a fixing ring (351) is fixedly connected to the inner wall of the oil inlet pipe (35), a through hole (352) is opened on the outer wall of the fixing ring (351), the fixing ring (351) is penetrated by the rotating shaft (353) and is rotatably connected to the rotating shaft (353), the top of the rotating shaft (353) is fixedly connected to the impeller (354), the bottom of the rotating shaft (353) is fixedly connected to the cam (355), and the square plate (414) is in contact with the cam (355) under the action of a reset spring.

2. The oil-immersed transformer according to claim 1, characterized in that: The exhaust pipe (42) and the exhaust pipe (44) are both provided with one-way valves at the ends of the gas bin (411). Through the one-way valve of the exhaust pipe (42), the gas in the exhaust pipe (42) can only enter the gas bin (411), and through the one-way valve of the exhaust pipe (44), the gas in the gas bin (411) can only be discharged to the exhaust pipe (44).

3. The oil-immersed transformer according to claim 2, characterized in that: The gas chamber (411) is fixedly connected to the outer wall of the oil inlet pipe (35), and the three-way valve (43) is fixedly connected to the outer wall of the oil tank (31).

4. The oil-immersed transformer according to claim 1, characterized in that: The sealing sleeves (56) are provided in two groups, wherein one group of the sealing sleeves (56) is fixedly connected to the outer wall of the gas bin (411), and the other group of the sealing sleeves (56) is fixedly connected to the sealing cover (2). A heat dissipation pipe (101) is fixedly connected to the outer wall of the transformer housing (1).

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