Vacuum-pumping structure for oil conservator of on-load tap-changing transformer

Abstract

The invention discloses an on-load voltage regulating transformer oil conservator vacuumizing structure which comprises a body oil conservator and a capsule, the capsule is arranged in the body oil conservator, a connecting opening is formed in the top of the capsule, one end of a connecting pipe is connected with the connecting opening, elastic arc plates are installed at the two ends of the capsule, and first sliding rods are installed on the outer walls of the elastic arc plates; the outer wall of the first fixing rod is sleeved with the first sliding rod, a second sliding rod is installed at the top of the first sliding rod, a second fixing rod penetrates through the top of the second sliding rod, and a horizontal push rod is installed at the top of the second fixing rod. The capsule position is limited in the vacuumizing and capsule deformation process, so that the capsule is kept in a centered state, the relative stability of the capsule position is ensured, the deformation degrees of the two ends of the capsule are the same, the deformation uniformity of the capsule is improved, and the accuracy of an oil level detection result in a body oil conservator is improved. And the connecting stability and the sealing performance of the capsule and the main connecting pipe are improved, and it is ensured that vacuumizing operation is smoothly carried out.

Description

Technical Field

[0001] This invention relates to the field of transformer oil conservator technology, specifically to a vacuum structure for an on-load tap-changing transformer oil conservator. Background Technology

[0002] The transformer oil conservator is the oil storage device for an oil-immersed transformer. It is connected to the transformer tank via pipelines. The bladder-type oil conservator compensates for the thermal expansion and contraction of the transformer oil by deforming the bladder. When injecting oil into the oil conservator or transformer, it needs to be done under vacuum conditions in the oil conservator and transformer. Therefore, it is necessary to evacuate the oil conservator. However, currently, when evacuating the bladder or when the bladder expands or contracts, the bladder is prone to shaking, making it difficult to maintain a stable and centered state. This reduces the ability to judge the oil level in the oil conservator, thus affecting the oil injection operation. At the same time, it can also reduce the connection effect between the main connecting pipe and the bladder, thereby reducing the vacuuming effect.

[0003] Patent document CN216362093U discloses an oil filling system and vacuum device for a capsule-type oil tank. The patent achieves the purpose of simplifying the oil filling and vacuuming structure by setting up a four-way connecting pipe, a first connecting pipe and a second connecting pipe. The four-way connecting pipe includes a first branch pipe, a second branch pipe, a third branch pipe and a fourth branch pipe arranged in a cross-connection manner. However, the patent does not consider the impact of the capsule's stability and deformation uniformity on the accuracy of oil level detection, the connection sealing and stability of the main connecting pipe and the capsule during vacuuming and capsule deformation. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum structure for the oil conservator of an on-load tap-changing transformer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a vacuum structure for an on-load tap-changing transformer oil tank, comprising a main oil tank and a capsule, wherein the capsule is disposed inside the main oil tank, and a connection port is provided on the top of the capsule; a main connecting pipe is installed through the top of the main oil tank, and one end of the main connecting pipe is connected to the connection port.

[0006] The capsule is equipped with elastic arc plates at both ends, and a first sliding rod is installed on the outer wall of the elastic arc plates. A slider is embedded in the inner wall of the left and right sides of the main body oil storage tank. A first fixed rod is installed on the outer wall of the slider. The first sliding rod is sleeved on the outer wall of the first fixed rod. A second sliding rod is installed on the top of the first sliding rod. A second fixed rod is installed through the top of the second sliding rod.

[0007] The main body oil tank has a top frame installed on its top wall, and a gear is embedded in the bottom wall of the top frame. The gear is sleeved on the outer wall of the main connecting pipe. A horizontal push rod is installed on the top of the second fixing rod. A rack is installed on the opposite side of the two sets of horizontal push rods, and the rack meshes with the gear.

[0008] Preferably, the horizontal push rod is L-shaped, and a slider is installed on the top of the horizontal push rod, and the slider is embedded and connected to the top wall of the main body oil tank.

[0009] Preferably, the elastic arc plate is a polyurethane elastic plate or a composite plate of fluororubber elastic layer and stainless steel elastic sheet, and the elastic arc plate bends and deforms as the capsule expands or contracts.

[0010] Preferably, the main body oil tank is equipped with a buffer module, which is used to buffer the sudden change in oil volume;

[0011] The buffer module includes a connecting pipe, a spiral guide plate, and a conical cover;

[0012] A connecting pipe is installed on the bottom wall of the main body oil tank. The bottom end of the connecting pipe is connected to the transformer body. A spiral guide plate is installed on the inner wall of the connecting pipe. A conical cover is installed on the bottom wall of the main body oil tank, and the conical cover is located outside the connecting pipe. A channel is opened through the outer wall of the conical cover.

[0013] Preferably, the buffer module further includes a buffer plate, a T-shaped frame, and a buffer spring;

[0014] The outer wall of the conical cover is symmetrically hinged with a buffer plate. The top of the buffer plate has a through hole. The inner wall of the main body oil tank has an installation groove. The inner wall of the installation groove has an arc groove. A sliding rod is embedded in the arc groove. A connecting block is sleeved on the outer wall of the sliding rod. The connecting block is fixedly connected to the outer wall of the buffer plate.

[0015] An installation frame is provided in the side wall of the main body oil tank. The installation frame is located above the installation groove. A buffer spring and a buffer damper are installed on the top wall of the installation frame. The buffer damper is located outside the buffer spring. A T-shaped bracket is connected to the bottom end of the buffer spring. The bottom end of the T-shaped bracket passes through the bottom wall of the installation frame and fits against the top of the connecting block.

[0016] Preferably, the inner wall of the main body oil tank is provided with a float rod, the top of the float rod is connected to a float ball, the float ball is located at the bottom of the capsule, the bottom end of the float rod is connected to an oil level gauge, and the oil level gauge is installed on the outer wall of the main body oil tank.

[0017] Preferably, a limiting groove is formed through the top of the buffer plate, and the float rod passes through the inner wall of the limiting groove.

[0018] Preferably, a switch oil conservator is installed on one side of the main body oil conservator, and the switch oil conservator is connected to the on-load tap changer oil chamber in the transformer body through a bottom connecting pipe.

[0019] Preferably, a switching connection pipe is connected to the main connecting pipe, one end of which is connected to the top of the switch oil tank. A ball valve is installed on the switching connection pipe. A tee pipe is installed through the top of the main oil tank, one end of which is connected to the main connecting pipe, and the other end of which is used to connect to the vacuum pump. A ball valve is installed on the connection pipe between the tee pipe and the main oil tank, and a ball valve is installed on the connection pipe between the tee pipe and the vacuum pump.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This invention restricts the position of the capsule during vacuuming and its contraction, expansion, and deformation by installing an elastic arc plate, a first fixed rod, a first sliding rod, a slider, a second fixed rod, and a second sliding rod. This keeps the capsule in a centered position, ensuring relative stability. By setting a horizontal push rod, rack, and gear, the deformation of both ends of the capsule is made the same, improving the uniformity of capsule deformation. Improving capsule stability and deformation uniformity helps to improve the accuracy of oil level detection results in the main oil tank, as well as the connection stability and sealing between the capsule and the main connecting pipe, ensuring smooth vacuuming operations.

[0022] 2. This invention, by installing a buffer module, including a spiral guide plate and a conical cover, transforms the linear, high-velocity transformer oil flow into a low-velocity, spiral-shaped transformer oil flow. The conical cover then evenly diffuses the transformer oil into the main body oil tank, preventing uneven impacts from sudden increases in transformer oil on the capsule surface, thus improving capsule stability. By incorporating buffer plates, buffer springs, and buffer damping, the impact force generated by sudden changes in transformer oil flow is buffered, which helps extend the service life of the capsule and the main body oil tank.

[0023] 3. This invention creates a limiting groove on the buffer plate and passes the float through the limiting groove, changing the float from a single contact point to two contact points. This prevents the float from swinging left and right when the oil tank is evacuated or when the oil level fluctuates, such as when the oil level in the tank increases or decreases. This helps to improve the accuracy of oil level detection in the oil tank.

[0024] 4. This invention simplifies the vacuuming pipeline by setting up a main connecting pipe, a switch connecting pipe, and a three-way pipe. During vacuuming, the air inlet of the dehumidifier is sealed with a cover plate, and then ball valve one, ball valve two, ball valve three, and vacuum pump are opened to realize the overall vacuuming operation of the switch oil tank, the main body oil tank, and the capsule, saving the problems of complex vacuuming pipelines and inconvenient operation of the oil tank. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the top structure of the main body oil tank of the present invention;

[0027] Figure 3 This is a schematic diagram of the front structure of the capsule of the present invention;

[0028] Figure 4 This is a schematic diagram of the front structure of the main body oil tank of the present invention;

[0029] Figure 5 This is a schematic diagram of the front structure of the buffer plate of the present invention;

[0030] Figure 6 This is a schematic diagram of the front structure of the T-shaped frame of the present invention;

[0031] Figure 7 This is a schematic diagram of the top structure of the buffer plate of the present invention.

[0032] In the diagram: 1. Main oil tank; 2. Capsule; 3. Main connecting pipe; 4. Elastic arc plate; 5. First sliding rod; 6. Slider one; 7. First fixed rod; 8. Second sliding rod; 9. Second fixed rod; 10. Horizontal push rod; 11. Top frame; 12. Gear; 13. Rack; 14. Slider two; 15. Buffer module; 16. Connecting pipe; 17. Spiral guide plate; 18. Conical cover; 19. Channel one; 20. Buffer plate; 21. Channel two; 22. Sliding rod; 23. Mounting groove; 24. Arc groove; 25. Mounting frame; 26. T-shaped frame; 27. Buffer spring; 28. Buffer damping; 29. ​​Limiting groove; 30. Float rod; 31. Float ball; 32. Switch oil tank; 33. Switch connecting pipe; 34. Ball valve one; 35. T-pipe; 36. Ball valve two; 37. Ball valve three. Detailed Implementation

[0033] 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.

[0034] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Please see Figure 1 The present invention provides an embodiment of a vacuum structure for an on-load tap-changing transformer oil conservator, comprising a main oil conservator 1 and a capsule 2. The capsule 2 is disposed inside the main oil conservator 1. A connection port is provided on the top of the capsule 2. A suspension hook is installed on the top of the capsule 2, and the suspension hooks are symmetrically distributed on the left and right sides of the connection port. The capsule 2 is installed on the top wall of the main oil conservator 1 through the suspension hooks. A main connecting pipe 3 is installed through the top of the main oil conservator 1, and one end of the main connecting pipe 3 is connected to the connection port. The other end of the main connecting pipe 3 is used to connect to a dehumidifier. The dehumidifier is used to dehumidify and dry the drawn-in air. A cover plate is provided at the air inlet of the dehumidifier to seal the air inlet of the dehumidifier.

[0037] A switch oil conservator 32 is installed on one side of the main body oil conservator 1. The switch oil conservator 32 is connected to the on-load tap changer oil chamber in the transformer body through the bottom connecting pipe. The on-load tap changer oil chamber is used to install or place the on-load tap changer. The on-load tap changer can achieve the purpose of voltage regulation by switching the winding group connectors without interrupting power.

[0038] A switching connection pipe 33 is connected to the main connecting pipe 3. One end of the switching connection pipe 33 is connected to the top of the switch oil tank 32. A ball valve 34 is installed on the switching connection pipe 33. A three-way pipe 35 is installed through the top of the main oil tank 1. One end of the three-way pipe 35 is connected to the main connecting pipe 3. The other end of the three-way pipe 35 is used to connect to the vacuum pump. A ball valve 36 is installed on the connection pipe between the three-way pipe 35 and the main oil tank 1. A ball valve 37 is installed on the connection pipe between the three-way pipe 35 and the vacuum pump.

[0039] Furthermore, when vacuuming the transformer oil conservator, a cover plate is used to seal the air inlet of the dehumidifier. A vacuum pump is connected to one end of the three-way pipe 35, and ball valves 34, 36, and 37 are opened. The vacuum pump is then used to perform the evacuation operation, which enables simultaneous vacuuming of the main oil conservator 1, capsule 2, and switch oil conservator 32. This solves the problem that due to transformer layout limitations, the switch oil conservator 32, main oil conservator 1, capsule 2, and transformer body are dispersed, requiring multiple connecting pipes or temporary transfer pipes to achieve the vacuuming operation. This simplifies the vacuuming pipeline structure, making the vacuuming operation more convenient, and enables the overall vacuuming of the transformer oil conservator and the transformer.

[0040] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 The present invention provides an embodiment of a vacuum structure for an on-load tap-changing transformer oil tank, comprising a main oil tank 1 and a capsule 2. The capsule 2 is disposed inside the main oil tank 1, and a connection port is provided on the top of the capsule 2. A main connecting pipe 3 is installed through the top of the main oil tank 1, and one end of the main connecting pipe 3 is connected to the connection port.

[0041] Both ends of capsule 2 are fitted with elastic arc plates 4. The elastic arc plates 4 are circular, concave plates, and are composite plates made of polyurethane elastic plates or fluororubber elastic layers and stainless steel elastic sheets. The elastic arc plates 4 bend and deform as capsule 2 expands or contracts. A first sliding rod 5 is installed on the outer wall of the elastic arc plate 4, located at the center of the elastic arc plate 4. Slider blocks 6 are embedded in the inner walls of the left and right sides of the main body oil tank 1. Slider blocks 6 can slide along their embedded connection with the main body oil tank 1. A first fixing rod 7 is installed on the outer wall of slider 6. The first sliding rod 5 is sleeved on the outer wall of the first fixing rod 7. The first fixing rod 7 is T-shaped to prevent separation between the first fixing rod 7 and the first sliding rod 5. A second sliding rod 8 is installed at the top of the first sliding rod 5, and a second fixing rod 9 is installed through the top of the second sliding rod 8. Both rod 8 and the second fixing rod 9 are vertical. A top frame 11 is installed on the top wall of the main oil tank 1. The top frame 11 is located between two sets of suspension hooks. The bottom end of the main connecting pipe 3 passes through the bottom wall of the top frame 11 and is connected to the connection port of the capsule 2. A gear 12 is embedded in the bottom wall of the top frame 11. The gear 12 is sleeved on the outer wall of the main connecting pipe 3. A horizontal push rod 10 is installed on the top of the second fixing rod 9. The horizontal push rod 10 is L-shaped, and the long section of the horizontal push rod 10 extends towards the top frame 11 and passes through the outer wall of the top frame 11 to the inside of the top frame 11. A rack 13 is installed on the opposite side of the two sets of horizontal push rods 10. Both sets of racks 13 mesh with the gear 12, and the two sets of racks 13 are symmetrically distributed about the center of the gear 12. The horizontal push rod 10 is L-shaped, and a slider 14 is installed on the top of the horizontal push rod 10. The slider 14 is embedded and connected to the top wall of the main oil tank 1.

[0042] Furthermore, after the oil conservator is evacuated, ball valves 34, 36, and 37 are closed, and the cover is removed from the air inlet of the dehumidifier, allowing capsule 2 to communicate with the atmosphere. This facilitates the expansion of capsule 2 or the compression of the oil within the transformer body to compensate for the volume changes caused by thermal expansion and contraction of the transformer oil. When the transformer in the transformer body undergoes thermal expansion, the transformer oil enters the main body oil conservator 1, causing the oil level in the main body oil conservator 1 to rise. This, in turn, applies pressure to capsule 2, causing capsule 2 to expel air through the main connecting pipe 3 and undergo contraction. When capsule 2 contracts, in the longitudinal direction, the second sliding rod 8 slides upward along the surface of the second fixed rod 9, driving the first sliding rod 5, the elastic arc plate 4, and capsule 2 to move synchronously. Under the constraint of slider 6 and the first fixed rod 7, the capsule 2 is prevented from swaying back and forth, ensuring the longitudinal deformation and contraction direction of capsule 2 and improving the stability of capsule 2 during deformation. In the transverse direction, the contraction of capsule 2 causes the elastic arc plate 4 to bend and deform inward, and the first sliding rod 5 moves along the surface of the first fixed rod 7 towards the capsule 2. When the second sliding rod 8 moves, it drives the horizontal push rod 10 to move horizontally through the second fixed rod 9 and the second sliding rod 8. When the horizontal push rod 10 moves, it drives the rack 13 to move. Through the meshing of the rack 13 and the gear 12, the racks 13 on both sides and the horizontal push rod 10 move synchronously and with the same moving length, thereby keeping the contraction degree of both ends of capsule 2 the same. Similarly, when the oil temperature in the transformer body decreases, causing capsule 2 to expand by air intake and the oil level in the main body oil tank 1 to decrease, capsule 2 expands evenly, ensuring that capsule 2 can maintain a stable state of being centered and uniformly changing during changes in oil level in the main body oil tank 1 and during vacuuming, improving the connection stability and sealing effect between capsule 2 and main connecting pipe 3, and ensuring the smooth progress of vacuuming operation.

[0043] Please see Figure 4 An embodiment of the present invention provides a vacuum structure for an on-load tap-changing transformer oil storage tank, comprising a supporting mesh tube with open ends on both sides inside a capsule 2, elastic metal wires are wound into a spiral elastic coil with a cross-sectional diameter of 2-5 mm, the spiral metal coils are woven into a quadrilateral or honeycomb mesh cylindrical tube, and the mesh cylindrical tube is installed on the inner wall of the capsule 2 by point bonding.

[0044] When the oil level in the transformer body rises, the transformer oil enters the main body oil conservator 1 through the connecting pipe 16, causing the capsule 2 to be squeezed and contracted. Under the support and guidance of the spiral elastic coil, the stretched support network tube contracts evenly inward, causing the capsule 2 to contract evenly. This avoids wrinkles or local concavity in the capsule 2, preventing damage to the capsule 2 and also preventing the abnormal phenomenon of the capsule 2 wrapping the float, thus improving the accuracy of oil level detection in the main body oil conservator 1.

[0045] Please see Figure 5 , Figure 6 and Figure 7 An embodiment of the present invention provides a vacuum structure for an on-load tap-changing transformer oil tank, including a buffer module 15 disposed inside the main body oil tank 1. The buffer module 15 is used to buffer the sudden change in oil. The buffer module 15 includes a connecting pipe 16, a spiral guide plate 17 and a conical cover 18.

[0046] A connecting pipe 16 is installed on the bottom wall of the main body oil tank 1. The bottom end of the connecting pipe 16 is connected to the transformer body. A spiral guide plate 17 is provided on the inner wall of the connecting pipe 16. A conical cover 18 is installed on the bottom wall of the main body oil tank 1, and the conical cover 18 is located outside the connecting pipe 16. A channel 19 is opened through the outer wall of the conical cover 18. The channel 19 is evenly distributed on the outer side of the conical cover 18, and the diameter of the channel 19 decreases from bottom to top.

[0047] The buffer module 15 also includes a buffer plate 20, a T-shaped frame 26, and a buffer spring 27. The outer wall of the conical cover 18 is symmetrically hinged with the buffer plate 20. The outer wall of the buffer plate 20 is slidably connected to the inner wall of the main body oil tank 1. The top of the buffer plate 20 has a through hole 21, which consists of a cylindrical hole in the lower half and a trumpet-shaped hole in the upper half. The inner wall of the main body oil tank 1 has an installation groove 23. The inner wall of the installation groove 23 has an arc groove 24. A sliding rod 22 is embedded in the arc groove 24. A connecting block is sleeved on the outer wall of the sliding rod 22, and the connecting block is fixedly connected to the outer wall of the buffer plate 20. The buffer plate 20 is limited by setting the arc groove 24 and the sliding rod 22.

[0048] An installation frame 25 is provided in the side wall of the main body oil tank 1. The installation frame 25 is located above the installation groove 23. A buffer spring 27 and a buffer damper 28 are installed on the top wall of the installation frame 25. The buffer damper 28 is located outside the buffer spring 27. The bottom end of the buffer spring 27 is connected to a T-shaped frame 26. The bottom end of the T-shaped frame 26 penetrates the bottom wall of the installation frame 25 and fits against the top of the connecting block. The output end of the buffer damper 28 is connected to the top wall of the T-shaped frame 26.

[0049] Furthermore, when a sudden increase in temperature inside the transformer causes a sudden increase in the amount of transformer oil entering the main body oil conservator 1, the transformer oil enters the main body oil conservator 1 through the connecting pipe 16. By setting a spiral guide plate 17 in the connecting pipe 16, the high-velocity linear flow of transformer oil is transformed into a spiral flow, and the oil flow velocity is reduced, preventing the linearly flowing transformer oil from directly impacting the capsule 2, thus protecting the capsule 2. The transformer oil enters the conical cover 18 through the connecting pipe 16. By setting channels 19 around the conical cover 18 and at the top, the transformer oil is guided and evenly diffused into the main body oil conservator 1, thereby preventing the transformer oil from having a large impact on the capsule 2 directly above it, avoiding uneven compression of the capsule 2, and improving the uniformity of the shrinkage deformation of the capsule 2 under vacuum and compression conditions. After passing through the conical cover 18, the transformer oil enters the main body oil tank 1. The rising oil is buffered by the buffer plate 20. The buffer plate 20 drives the connecting block to swing, and the connecting block drives the slide rod 22 to slide upward along the inner wall of the arc groove 24. The connecting block pushes the T-shaped frame 26 to move upward, so that the T-shaped frame 26 squeezes the buffer spring 27 and the buffer damper 28, further buffering the oil pressure. The transformer oil diffuses evenly upward through the hole 21 on the buffer plate 20, reducing the concentration of the transformer oil. This allows the outer wall of the capsule 2 to be evenly squeezed by the transformer oil. Under the transient flow field and pressure pulsation caused by vacuuming, pump start-up and shutdown, transformer oil temperature jump or external impact, the impact or local squeezing phenomenon of oil on the outer surface of the capsule 2 is significantly reduced, which is beneficial to extending the service life of the capsule 2 in the oil tank, and at the same time improving the deformation uniformity of the capsule 2.

[0050] Please see Figure 5 and Figure 7 An embodiment of the present invention provides a vacuuming structure for an on-load tap-changing transformer oil conservator, comprising a float 30 disposed on the inner wall of the main body oil conservator 1, a float ball 31 connected to the top of the float 30, the float ball 31 being located at the bottom of the capsule 2, the bottom end of the float 30 being connected to an oil level gauge, the oil level gauge being installed on the outer wall of the main body oil conservator 1, and a limiting groove 29 being formed through the top of the buffer plate 20, the float 30 being disposed in the inner wall of the limiting groove 29.

[0051] Furthermore, by setting up a float 30, a float ball 31, and an oil level gauge, the transformer oil level in the main body oil tank 1 is limited, thereby promptly reminding relevant personnel to perform oil replenishment operations. The float 30 passes through the limiting groove 29, which provides support to the float 30 from the outside of the cover. This allows the float 30 to have two contact positions: one connected to the oil level gauge and the other in contact with the limiting groove 29. This limits the swing direction of the float 30, preventing it from swinging left and right when the oil tank is evacuated or when the oil level fluctuates, such as when the oil level increases or decreases. This helps improve the accuracy of oil level detection in the oil tank.

[0052] Working Principle: A main connecting pipe 3, a switching connecting pipe 33, and a three-way pipe 35 are installed, with ball valves on the pipes to simplify and optimize the vacuuming pipeline. During vacuuming, the air inlet of the dehumidifier is sealed with a cover plate. A vacuum pump is connected to one end of the three-way pipe 35, and ball valves 1-34, 2-36, and 3-37 are opened. Vacuuming is then performed by the vacuum pump, enabling simultaneous vacuuming of the main body oil conservator 1, capsule 2, and switching oil conservator 32. After vacuuming, the ball valves are closed, and the cover plate is removed, allowing capsule 2 to expand through the main connecting pipe 3 or compress to exhaust air. This ensures the oil conservator can accommodate the volume changes of the transformer oil in the transformer body due to thermal expansion and contraction. When the oil temperature inside the transformer body rises, the transformer oil enters the main body oil conservator 1 through the connecting pipe 16. A spiral guide plate 17 inside the connecting pipe 16 reduces the flow velocity and changes the flow direction of the transformer oil. A conical shroud 18 is used to homogenize the transformer oil. The uniform distribution of the transformer oil prevents localized impacts on capsule 2, thus maintaining the uniformity of capsule 2's deformation. The buffer plate 20, buffer spring 27, and buffer damper 28 buffer sudden oil impacts, significantly reducing the impact or localized compression of the outer surface of capsule 2, which helps extend the service life of capsule 2 in the oil tank. During capsule 2 deformation, the coordinated use of slider 6, first fixed rod 7, first sliding rod 5, second sliding rod 8, second fixed rod 9, elastic arc plate 4, horizontal push rod 10, gear 12, and rack 13 ensures the uniformity of capsule 2's deformation and its stable position within the main oil tank 1, improving the connection stability and sealing effect between capsule 2 and the main connecting pipe 3, ensuring smooth vacuuming operations. The support mesh on the inner wall of capsule 2 maintains the uniformity of capsule 2's shape during deformation, preventing wrinkles and improving the accuracy of oil level detection within the main oil tank 1.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A structure for vacuumizing an oil conservator of an on-load tap changer, characterized by comprising: Including the body oil tank (1) and the capsule (2), the body oil tank (1) is provided with the capsule (2) inside, the top of the capsule (2) is provided with a connecting port, the top of the body oil tank (1) is provided with a main connecting pipe (3), and one end of the main connecting pipe (3) is connected with the connecting port; The both ends of the capsule (2) are provided with elastic arc plates (4), the outer wall of the elastic arc plate (4) is provided with a first sliding rod (5), the inner wall of the left and right sides of the body oil tank (1) is embeddedly provided with a sliding block (6), the outer wall of the sliding block (6) is provided with a first fixed rod (7), the first sliding rod (5) is sleeved on the outer wall of the first fixed rod (7), the top of the first sliding rod (5) is provided with a second sliding rod (8), and the top of the second sliding rod (8) is provided with a second fixed rod (9). The top wall of the body oil tank (1) is provided with a top frame (11), the bottom wall of the top frame (11) is embeddedly provided with a gear (12), the gear (12) is sleeved on the outer wall of the main connecting pipe (3), the top of the second fixed rod (9) is provided with a horizontal push rod (10), and the opposite sides of the two groups of horizontal push rods (10) are respectively provided with a rack (13), and the rack (13) is engaged with the gear (12).

2. The oil conservator vacuum structure of the on-load tap-changing transformer according to claim 1, characterized in that: The horizontal push rod (10) is L-shaped, the top of the horizontal push rod (10) is provided with a sliding block, and the sliding block (14) is embeddedly connected to the top wall of the body oil tank (1).

3. The oil conservator vacuum structure of a load-regulated transformer according to claim 1, characterized in that: The elastic arc plate (4) is a polyurethane elastic plate or a composite plate of a fluororubber elastic layer and a stainless steel elastic sheet, and the elastic arc plate (4) is bent and deformed with the expansion or contraction of the capsule (2).

4. The oil conservator vacuum structure of a load-regulated transformer according to claim 1, characterized in that: The body oil tank (1) is provided with a buffer module (15), and the buffer module (15) is used for buffering the sudden change of oil; The buffer module (15) comprises a communication pipe (16), a spiral flow guide plate (17) and a conical cover (18). The bottom wall of the body oil tank (1) is provided with the communication pipe (16), the bottom end of the communication pipe (16) is connected with the transformer body, the inner wall of the communication pipe (16) is provided with the spiral flow guide plate (17), the bottom wall of the body oil tank (1) is provided with the conical cover (18), the conical cover (18) is located outside the communication pipe (16), and the outer wall of the conical cover (18) is provided with a hole (19).

5. The oil conservator vacuum structure of a load regulation transformer according to claim 4, characterized in that: The buffer module (15) further comprises a buffer plate (20), a T-shaped frame (26) and a buffer spring (27). The outer wall of the conical cover (18) is symmetrically hinged with the buffer plate (20), the top of the buffer plate (20) is provided with a hole (21), the inner wall of the body oil tank (1) is provided with a mounting groove (23), the inner wall of the mounting groove (23) is provided with an arc-shaped groove (24), the arc-shaped groove (24) is embeddedly connected with a sliding rod (22), the outer wall of the sliding rod (22) is sleeved with a connecting block, and the connecting block is fixedly connected with the outer wall of the buffer plate (20). The outer wall of the conical cover (18) is symmetrically hinged with the buffer plate (20), the top of the buffer plate (20) is provided with a hole (21), the inner wall of the body oil tank (1) is provided with a mounting groove (23), the inner wall of the mounting groove (23) is provided with an arc-shaped groove (24), the arc-shaped groove (24) is embeddedly connected with a sliding rod (22), the outer wall of the sliding rod (22) is sleeved with a connecting block, and the connecting block is fixedly connected with the outer wall of the buffer plate (20). The mounting frame (25) is located above the mounting groove (23), the top wall of the mounting frame (25) is provided with a buffer spring (27) and a buffer damper (28), the buffer damper (28) is located outside the buffer spring (27), the bottom end of the buffer spring (27) is connected with a T-shaped frame (26), and the bottom end of the T-shaped frame (26) penetrates through the bottom wall of the mounting frame (25) and is attached to the top of the connecting block.

6. The oil conservator vacuum structure of a load regulation transformer according to claim 5, characterized in that: The inner wall of the body oil storage tank (1) is provided with a float rod (30), the top end of the float rod (30) is connected with a float ball (31), the float ball (31) is located at the bottom of the capsule (2), the bottom end of the float rod (30) is connected with an oil level gauge, and the oil level gauge is installed on the outer wall of the body oil storage tank (1).

7. The oil conservator vacuum structure of a load-regulated transformer according to claim 6, characterized in that: The top of the buffer plate (20) is provided with a limiting groove (29), and the float rod (30) is arranged in the inner wall of the limiting groove (29).

8. The oil conservator vacuum structure of a load-regulated transformer according to claim 1, characterized in that: One side of the body oil storage tank (1) is provided with a switch oil storage tank (32), and the switch oil storage tank (32) is connected with a load regulating switch oil chamber in the transformer body in a communication mode through a bottom connecting pipe.

9. The oil conservator vacuum structure of the load regulating transformer according to claim 8, characterized in that: The main connecting pipe (3) is connected with a switch connecting pipe (33), one end of the switch connecting pipe (33) is connected with the top of the switch oil storage tank (32), the switch connecting pipe (33) is provided with a ball valve (34), the top of the body oil storage tank (1) is provided with a three-way pipe (35), one end of the three-way pipe (35) is connected with the main connecting pipe (3), the other end of the three-way pipe (35) is used for connecting a vacuum pump, the three-way pipe (35) is provided with a ball valve (36) on a connecting pipeline of the body oil storage tank (1), and the three-way pipe (35) is provided with a ball valve (37) on a connecting pipeline of the vacuum pump.

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