Transformer internal oil channel reinforced circulation reduces high and low voltage winding temperature rise structure

Abstract

The application relates to a structure for reducing the temperature rise of high-voltage and low-voltage windings by strengthening the internal oil channel circulation of a transformer and belongs to the technical field of transformer windings. The structure comprises a main body, a pipeline arranged between high-voltage wire packages and low-voltage wire packages, a spacing adjusting assembly arranged on one side of the pipeline, a flow adjusting assembly arranged in a fixing ring, a sealing ring arranged between a base and the fixing ring, and a sealing compensation assembly arranged outside the sealing ring. The moving plate is transversely translated through a plurality of equidistant inclined sliding grooves arranged in the moving plate, the sliding grooves and the moving pieces are mutually embedded and limited, the horizontal linear motion of the moving plate is converted into the radial gathering and scattering motion of a plurality of moving pieces, the pitch of the spiral pipeline is synchronously increased or reduced, the pitch is automatically reduced under high temperature and full load, the local hot spot overheating is inhibited, the pitch is reversely expanded under low temperature and light load, and the oil flow stroke is shortened.

Description

Technical Field

[0001] This invention relates to the field of transformer winding technology, specifically to a structure for enhancing the circulation of internal oil channels in a transformer to reduce the temperature rise of high and low voltage windings. Background Technology

[0002] Oil-immersed transformers rely on insulating mineral oil for winding heat dissipation and electrical insulation. They are the mainstream equipment in 110kV, 35kV and box-type substation power distribution scenarios. According to capacity, they are divided into large and medium-sized main transformers and box-type distribution transformers. Winding heating follows the six-degree rule: for every 6-8K increase in winding temperature, the insulation aging rate doubles and the service life is halved. Winding temperature rise and hot spot temperature are key indicators for safe operation of equipment. The role of insulating oil is to isolate high and low voltage coils and iron cores, ensure electrical insulation and absorb the heat generated by winding current loss, and dissipate heat to the outside through radiators.

[0003] However, in existing transformers, the main insulation interlayer between high and low voltage is a closed, narrow cavity. Direct oil flow is prone to unilateral short circuits, the oil flow in the interlayer is turbulent, and the mixing of hot and cold oil is uneven. The main insulation accumulates heat and ages locally over a long period of time. The oil flows rapidly upward in a straight line along the oil channel. The flow velocity in the center of the oil channel is high, and the oil close to the winding conductor wall is almost static, forming an oil stagnation boundary layer, i.e., a thermal resistance layer. It is difficult for the heat of the conductor to be effectively transferred to the insulating oil. High-temperature hot spots are easily formed in the upper part of the winding. The oil channel opening in the transformer is fixed and does not change. When the temperature changes, it is difficult to control the amount of oil flowing through the channel. Low-temperature oil blockage and high-temperature overflow are likely to occur. In addition, the oil channel inlet sealing ring in the transformer is a transformer-specific oil-resistant nitrile rubber ring. The nitrile rubber sealing ring expands and contracts significantly with temperature changes. Cold oil will bypass the internal oil channel of the winding and directly short-circuit back to the oil tank from the sealing gap, resulting in insufficient actual oil intake of the winding.

[0004] To address the aforementioned issues, there is an urgent need for innovative designs based on the existing structure of enhanced circulation in the transformer's internal oil channels to reduce the temperature rise of the high and low voltage coils. Summary of the Invention

[0005] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Specifically, the present invention aims to provide a structure for enhancing the circulation of internal oil channels in transformers to reduce the temperature rise of high and low voltage windings, thereby solving the problems mentioned in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a structure for enhancing the circulation of oil channels inside a transformer to reduce the temperature rise of high and low voltage windings, comprising a main body, a base fixed inside the main body, three high-voltage coils equally spaced inside the base, each high-voltage coil containing a low-voltage coil, a pipe arranged between the high-voltage and low-voltage coils in a spiral configuration, a spacing adjustment component on one side of the pipe for adjusting the pitch of the pipe, a fixed ring at the lower end of the pipe, a flow adjustment component inside the fixed ring, multiple sliding plates equally angled inside the flow adjustment component for adjusting the opening size of the fixed ring by moving the sliding plates, a sealing ring between the base and the fixed ring, a sealing compensation component outside the sealing ring, a push plate inside the sealing compensation component for adjusting the sealing amount of the sealing ring by moving the push plate, the multiple push plates being slidably connected at equal angles, and the sealing ring being movably connected to the push plate.

[0007] Preferably, the spacing adjustment assembly includes a movable block disposed on one side of the pipeline, a movable plate fixed to the bottom end of the movable block, a plurality of movable parts slidably connected at equal intervals inside the movable plate, a slide rail slidably connected to one side of each movable part, an electric telescopic rod fixed to one side of the movable block, a first sliding rod fixed to the other side of the movable block, and a first oil tank slidably connected to the outer wall of the first sliding rod.

[0008] Preferably, the movable plate has a sliding groove that moves with the movable component, and the sliding grooves are evenly spaced and arranged side by side, extending obliquely from the lower left side to the upper right side of the movable plate. The base has a cavity that moves with the movable block, and the slide rail and the first oil tank are fixedly connected to the inner wall of the cavity.

[0009] Preferably, the flow regulating component includes a rotating ring rotatably connected to the outer wall of the fixed ring, a second sliding rod fixed on one side of the rotating ring, a second oil tank slidably connected to the outer wall of the second sliding rod, and a plurality of limiting posts slidably connected to the rotating ring at equal angles, the limiting posts being fixedly connected to the sliding plate.

[0010] Preferably, the rotating ring has a guide groove that moves in conjunction with the limiting post, and the fixed ring has a cavity that moves in conjunction with the protruding position of the sliding plate. The fixed ring is fixedly connected to the base.

[0011] Preferably, the base has a cavity that accommodates the movement of the second oil tank and the rotating ring. The rotating ring is rotatably connected to the inner wall of the cavity, and the second oil tank is rotatably connected to a protrusion on the inner wall of the cavity.

[0012] Preferably, the sealing compensation component includes pull plates that are equidistantly disposed outside the sealing ring, with a rotating component rotatably connected to the bottom ends of two adjacent pull plates, a fixed seat provided at the bottom of the pull plate, and a push rod slidably connected within the fixed seat, with one end of the push rod slidably connected to the pull plate and the other end slidably connected to the push plate.

[0013] Preferably, a third sliding rod is fixed at a protruding position on one side of one of the pull plates. The third sliding rod is slidably connected to a third oil tank. The base has a cavity that moves in conjunction with the third oil tank, the pull plate, and the push plate. The third oil tank is rotatably connected to the inner wall of the cavity. The third oil tank and the second oil tank are connected to the moving block via hoses.

[0014] Preferably, the fixed seat is fixedly connected to the inner wall of the cavity, the push plate has a cavity that cooperates with the push rod, and the sealing ring is slidably connected to the push plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention utilizes a single movable plate with multiple equidistant inclined grooves that move laterally. The grooves and movable components interlock and limit each other, transforming the horizontal linear motion of the movable plate into the radial convergence and divergence motion of multiple sets of movable components. Each movable component is fixed to a spiral pipe, ultimately achieving synchronous increase or decrease in the pitch of the spiral pipe. The pitch automatically decreases under high temperature and full load, effectively increasing the heat exchange area between the cooling medium and the coil, extending the contact heat exchange time between the insulating oil and the winding conductor, preventing the problem of low-viscosity hot oil flowing out of the winding directly due to excessively fast flow rate and insufficient heat absorption. It precisely controls the temperature rise of the winding, suppresses local hot spot overheating, and reverses the pitch under low temperature and light load, reducing the overall resistance of the oil circuit, reducing the oil pump load, reducing useless power consumption, and achieving energy-saving operation.

[0017] 2. This invention uses a sliding rod to lift and lower, driving a rotating ring with a guide groove to rotate circumferentially. The rotating ring drives multiple evenly distributed sliding plates to extend and retract radially through the oblique guide groove on the ring surface, simultaneously changing the oil inlet diameter at the fixed ring. This achieves synchronous linkage between the oil inlet opening and the spiral pitch. At high temperatures, the pitch is reduced to increase the internal resistance of the oil circuit while automatically narrowing the oil inlet opening. At low temperatures, the pitch is enlarged to reduce the internal resistance and simultaneously enlarge the oil inlet. The flow resistance of the front and rear oil circuits is dynamically matched to avoid oil pressure buildup and hot oil backflow blocking the oil inlet channel. It adapts to the high and low temperature viscosity change characteristics of insulating oil. Under low temperature and high viscosity conditions, the oil inlet diameter is increased to reduce the resistance of cold oil inlet, preventing the winding from lacking oil and overheating at the moment of start-up. After the oil becomes thinner at high temperatures, the flow is throttled and limited to avoid excessive oil evaporation and deterioration of the oil.

[0018] 3. This invention uses the displacement of a sliding rod to pull a hinged connecting rod assembly. The connecting rod and fixed hinge seat form a deformable parallelogram transmission structure. Utilizing the mechanical properties of a parallelogram with constant side length and variable included angle, the swing displacement of the connecting rod is converted into a linear thrust of the push rod. Multiple staggered push plates surround the outside of the sealing ring and are uniformly driven by the push rod to converge or release, completing the dynamic compression and depressurization of the sealing ring. When the high-temperature oil circuit is pressurized, the sealing ring is compressed, increasing the pre-tightening pressure of the sealing surface, offsetting the oil pressure inside the pipeline, preventing insulating oil from leaking from the sealing gap, avoiding oil shortage, insulation moisture aging, and other issues. Under low-temperature pipeline negative pressure conditions, the clamping force is released to prevent the sealing ring from being sucked down and damaged by the negative pressure, extending the service life of the seal. The dynamic sealing eliminates the bypass oil leakage channel at the oil inlet, ensuring that all cold oil can only flow through the internal spiral pipeline, avoiding insufficient actual oil intake and temperature rebound caused by bypass oil leakage. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a structural schematic diagram showing the connection between the base and the high-voltage coil of the present invention;

[0021] Figure 3 This is a schematic unfolded view of the connection between the high-voltage coil and the low-voltage coil of the present invention;

[0022] Figure 4 This is a three-dimensional structural schematic diagram of the spacing adjustment component of the present invention;

[0023] Figure 5 This is a schematic diagram showing the connection between the fixing ring and the sealing ring of the present invention;

[0024] Figure 6 This is a three-dimensional structural schematic diagram of the flow regulation component of the present invention;

[0025] Figure 7 This is a three-dimensional structural schematic diagram of the flow regulating component of the present invention;

[0026] Figure 8 This is a schematic unfolded view of the connection between the fixing ring and the sealing ring of the present invention;

[0027] Figure 9 This is a three-dimensional structural schematic diagram of the sealing compensation component of the present invention;

[0028] Figure 10 This is a three-dimensional structural diagram of the pusher plate movement path of the present invention.

[0029] In the diagram: 1. Main body; 2. Base; 3. High-voltage coil; 4. Low-voltage coil; 5. Pipeline; 601. Moving block; 602. Moving plate; 603. Slide groove; 604. Moving part; 605. Slide rail; 606. First sliding rod; 607. First oil tank; 7. Fixed ring; 801. Second oil tank; 802. Second sliding rod; 803. Rotating ring; 804. Guide groove; 805. Limiting post; 9. Sliding plate; 10. Sealing ring; 111. Third oil tank; 112. Third sliding rod; 113. Pull plate; 114. Rotating part; 115. Push rod; 116. Fixed seat; 12. Push plate. Detailed Implementation

[0030] Please see Figures 1 to 10 This invention provides a technical solution: a structure for enhancing the circulation of oil channels inside a transformer to reduce the temperature rise of high and low voltage windings, comprising a main body 1, a base 2 fixed inside the main body 1, three high-voltage coils 3 equally spaced inside the base 2, a low-voltage coil 4 inside each high-voltage coil 3, a pipe 5 arranged between the high-voltage coils 3 and the low-voltage coils 4, the pipe 5 being spirally arranged, a pitch adjustment component on one side of the pipe 5 for adjusting the pitch of the pipe 5, and a fixing ring 7 at the lower end of the pipe 5, wherein a... There is a flow regulating component, and multiple sliding plates 9 are arranged at equal angles inside the flow regulating component. The flow regulating component drives the sliding plates 9 to move and adjust the opening size of the fixed ring 7. A sealing ring 10 is arranged between the base 2 and the fixed ring 7. A sealing compensation component is arranged outside the sealing ring 10. A push plate 12 is arranged inside the sealing compensation component. The sealing amount of the sealing ring 10 is adjusted by driving the push plate 12 to move. Multiple push plates 12 are slidably connected at equal angles. The sealing ring 10 is movably connected to the push plate 12.

[0031] In specific implementation, the main body 1 serves as the installation base, with a fixed base 2 inside the main body 1. Three sets of high-voltage coils 3 are arranged at equal intervals on the base 2, and each high-voltage coil 3 has a low-voltage coil 4 inside. A spiral pipe 5 is arranged between the high-voltage coils 3 and the low-voltage coils 4. The insulating oil circulates inside the pipe 5 to carry away the heat of the winding. When the equipment is affected by temperature changes, the pitch adjustment component can adjust the pitch of the pipe 5 to change the heat exchange area of ​​the oil. The pitch adjustment component is synchronously linked with the flow adjustment component, which drives the sliding plates 9, which are distributed at equal angles inside the fixed ring 7, to move, changing the opening size of the fixed ring 7 to adjust the oil inlet. The flow adjustment component is also linked with the sealing compensation component, which drives the push plates 12, which are assembled at equal angles on the outside of the sealing ring 10, to move, dynamically adjusting the sealing pressure of the sealing ring 10, and realizing the coordinated control of pitch, oil inlet opening, and sealing pressure.

[0032] As a further embodiment of the present invention, the spacing adjustment component includes a movable block 601 disposed on one side of the pipe 5, a movable plate 602 fixed at the bottom end of the movable block 601, a plurality of movable parts 604 slidably connected at equal intervals inside the movable plate 602, a slide rail 605 slidably connected to one side of the movable part 604, an electric telescopic rod fixed to one side of the movable block 601, a first sliding rod 606 fixed to the other side of the movable block 601, and a first oil tank 607 slidably connected to the outer wall of the first sliding rod 606.

[0033] In practice, the change in degree triggers the action of the electric telescopic rod, which drives the moving block 601 to move. The moving block 601 drives the moving plate 602 at the bottom to move together. With the sliding cooperation between the moving plate 602, the moving parts 604 and the slide rail 605, the position of each moving part 604 is changed, thereby adjusting the pitch of the spiral pipe 5. At the same time, the moving block 601 drives the first sliding rod 606 to slide within the first oil tank 607, squeezing the oil inside the first oil tank 607 and outputting hydraulic power, thereby linking the downstream flow regulation component and the sealing compensation component to operate synchronously.

[0034] As a further embodiment of the present invention, the movable plate 602 is provided with a sliding groove 603 that moves with the movable component 604, and the sliding grooves 603 are evenly arranged in parallel at equal intervals, extending obliquely from the lower left side to the upper right side of the movable plate 602. The base 2 is provided with a cavity that moves with the movable block 601, and the slide rail 605 and the first oil tank 607 are fixedly connected to the inner wall of the cavity.

[0035] In specific implementation, when the moving block 601 moves inside the cavity of the base 2, the moving plate 602 fixed to it moves synchronously. Relying on the guiding effect of the equally spaced obliquely arranged sliding grooves 603 on the moving plate 602, the moving part 604 is driven to slide on the slide rail 605 fixed to the inner wall of the cavity, thereby adjusting the pitch of the spiral pipe 5. As the moving block 601 moves, the first sliding rod 606 slides and squeezes the oil in the first oil tank 607 fixed to the inner wall of the cavity, providing linkage hydraulic power for the flow regulation and sealing compensation mechanism.

[0036] As a further embodiment of the present invention, the flow regulating component includes a rotating ring 803 rotatably connected to the outer wall of the fixed ring 7, a second sliding rod 802 fixed on one side of the rotating ring 803, a second oil tank 801 slidably connected to the outer wall of the second sliding rod 802, and a plurality of limiting posts 805 slidably connected to the rotating ring 803 at equal angles, and the limiting posts 805 are fixedly connected to the sliding plate 9.

[0037] In practice, the hydraulic oil supplied by the first oil tank 607 enters the second oil tank 801, pushing the second sliding rod 802 to slide back and forth, thereby driving the rotating ring 803 to rotate around the outer wall of the fixed ring 7. During the rotation of the rotating ring 803, the corresponding sliding plate 9 is synchronously displaced by multiple limit pins 805. The flow opening size of the fixed ring 7 is adjusted by the position change of the sliding plate 9, so as to realize the synchronous linkage adjustment of the oil flow rate with the change of the pitch of the pipeline 5.

[0038] As a further embodiment of the present invention, when the rotating ring 803 rotates, it drives the limiting post 805 to move by means of the guide groove 804 opened on its own, thereby driving the sliding plate 9 to slide inside the cavity of the fixed ring 7 which is fixedly connected to the base 2. The oil inlet diameter of the fixed ring 7 is changed by the position change of the sliding plate 9, and the oil inlet opening is controlled synchronously with the pitch adjustment of the pipeline 5.

[0039] In specific implementation, the rotating ring 803 has a guide groove 804 that moves in conjunction with the limiting post 805, and the fixed ring 7 has a cavity that moves in conjunction with the protruding position of the sliding plate 9. The fixed ring 7 is fixedly connected to the base 2.

[0040] As a further embodiment of the present invention, the base 2 has a cavity that cooperates with the second oil tank 801 and the rotating ring 803. The rotating ring 803 is rotatably connected to the inner wall of the cavity, and the second oil tank 801 is rotatably connected to the protrusion on the inner wall of the cavity.

[0041] In specific implementation, the cavity opened in the base 2 is used to accommodate the second oil tank 801 and the rotating ring 803. The second oil tank 801 is hinged to the protrusion on the inner wall of the cavity, and the rotating ring 803 is limited and assembled on the inner wall of the cavity. The force from the hydraulic oil drives the second oil tank 801 to drive the rotating ring 803 to rotate in the cavity, thereby driving the sliding plate 9 to complete the opening adjustment of the fixed ring 7, realizing the linkage flow control with the pitch change of the pipeline 5.

[0042] As a further embodiment of the present invention, the sealing compensation component includes pull plates 113 that are equally angled and disposed outside the sealing ring 10. A rotating member 114 is rotatably connected to the bottom end of two adjacent pull plates 113. A fixed seat 116 is provided at the bottom of the pull plate 113. A push rod 115 is slidably connected to the fixed seat 116. One end of the push rod 115 is slidably connected to the pull plate 113, and the other end is slidably connected to the push plate 12.

[0043] In practice, hydraulic oil drives the pull plate 113 to move. The pull plate 113 and the rotating part 114 are hinged to form a linkage transmission structure. The movement of the pull plate 113 pushes the push rod 115 to slide within the fixed seat 116. The push rod 115 further drives the push plate 12 to move, thereby adjusting the amount of pressure of the push plate 12 on the sealing ring 10 and realizing the linkage control of sealing compensation.

[0044] As a further embodiment of the present invention, a third sliding rod 112 is fixed at a protruding position on one side of a pull plate 113. The third sliding rod 112 is slidably connected to a third oil tank 111. The base 2 has a cavity that moves in conjunction with the third oil tank 111, the pull plate 113 and the push plate 12. The third oil tank 111 is rotatably connected to the inner wall of the cavity. The third oil tank 111 and the second oil tank 801 are connected to the moving block 601 through a hose.

[0045] In specific implementation, hydraulic oil delivered from the moving block 601 via a hose is routed into the second oil tank 801 and the third oil tank 111. The third oil tank 111 is mounted on the inner wall of the cavity of the base 2 and can rotate relative to it. Changes in oil pressure drive the third sliding rod 112 to slide back and forth, which in turn drives the pull plate 113 fixed to it to move. Then, through the matching transmission parts, the push plate 12 is moved to adjust the clamping amount of the sealing ring 10, so as to realize the synchronous linkage between the sealing compensation mechanism and the pitch and oil inlet opening adjustment of the pipeline 5.

[0046] As a further embodiment of the present invention, the fixed base 116 is fixedly connected to the inner wall of the cavity, the push plate 12 has a cavity that moves in conjunction with the push rod 115, and the sealing ring 10 is slidably connected to the push plate 12.

[0047] In specific implementation, the fixed seat 116 is fixed to the inner wall of the cavity of the base 2, and the push rod 115 is inserted into the cavity of the push plate 12 and can slide relative to it. Driven by the linkage structure, the push rod 115 reciprocates, thereby driving the push plate 12 to slide relative to the sealing ring 10. By changing the position of the push plate 12, the degree of compression on the sealing ring 10 is changed, so as to realize the synchronous linkage adjustment of the sealing pressure with the pitch of the pipe 5 and the opening of the fixed ring 7.

[0048] Working Principle: When using the internal oil channel enhanced circulation structure of this transformer to reduce the temperature rise of the high and low voltage coils, during transformer operation, the auxiliary shielded pump installed outside the main body 1 draws low-temperature insulating oil from the oil tank. The cold oil is diverted through the main oil inlet pipe and flow regulating valve, and precisely distributed to the oil inlet of the fixed ring 7 at the lower end of the spiral pipe 5 laid between the high voltage coil 3 and the low voltage coil 4. (The spiral pipe 5 is made of transformer-grade oil-resistant, high-temperature resistant, and flexible insulating material, such as aramid-reinforced polyimide insulating corrugated pipe, modified epoxy glass fiber composite flexible pipe, etc., with long-term temperature resistance and insulation oil corrosion resistance completely consistent with traditional insulating cylinders and guide partitions. The spiral pipe 5 is a thin-walled insulating flat pipe, embedded within the original main insulating oil gap width between the high voltage coil 3 and the low voltage coil 4, without adding additional main insulating oil gap width.) (Insulation radial distance, without changing the original insulation level design) After entering the spiral pipe 5, the cold oil is guided by the spiral flow channel and spirals upward along the pipe body. During the climbing process, it crosses the winding conductors of each layer of high voltage coil 3 and low voltage coil 4 laterally, continuously absorbing the heat generated by the copper loss and iron loss of the winding. After completing the heat exchange, the high temperature hot oil is collected from the arc-shaped guide shroud at the top of the winding to the oil outlet main pipe. The hot oil first passes through the oil filter at the front end of the pipeline to filter out carbon particles generated during the oil operation and metal impurities that are worn off by the iron core and conductors. The purified hot oil continues to be transported to the water-cooled radiator. The oil temperature drops rapidly by means of heat exchange between the cooling water and the wall of the insulating oil. The cooled insulating oil falls back into the transformer oil tank by its own weight and is drawn again by the auxiliary shielded pump, forming a closed-loop oil circuit.

[0049] Outdoor transformers are affected by seasonal temperature and load changes (transformer oil temperature changes slowly, exhibiting seasonal and load-related fluctuations). The temperature of the insulating oil inside the tank rises and falls synchronously. When the transformer is operating at full load and the oil temperature rises, a temperature control signal triggers the extension of the electric telescopic rod. This electric telescopic rod moves the moving block 601, which in turn moves the fixed moving plate 602 synchronously. Because the moving plate 602 has grooves 603 that cooperate with the moving parts 604, and these grooves 603 are evenly spaced and inclined, the movement of the moving plate 602 causes multiple moving parts 604 to slide on one side of the slide rail 605. The slide rail 605 is arranged axially along the high-voltage coil 3 and the low-voltage coil 4. The distance between adjacent moving parts 604 changes, causing a spiral... Pipe 5 is a continuous flexible spiral, with each turn of the pipe fixed to the moving part 604. Each turn of the pipe corresponds to an axial positioning node. When the moving part 604 is synchronously misaligned along the axial direction, the continuous pipe body changes the axial spacing synchronously with each node. The deformation of the pipe section is evenly distributed on the flexible pipe wall of the entire spiral. The deformation mode is a gradual adjustment of the spiral helix angle, which is a uniform axial bending. The reduction of the pitch of the spiral pipe 5 means that the heat dissipation pipes per unit axial length increase, the heat exchange area between the cooling medium and the coil is effectively increased, and the heat dissipation capacity automatically increases with the rise of oil temperature, forming a positive feedback regulation that the higher the oil temperature, the stronger the heat dissipation. The synchronous contraction of each turn ensures that the heat dissipation is evenly distributed along the axial direction of the coil, avoids the formation of hot spots due to insufficient local heat dissipation, and improves the uniformity of the winding temperature field.

[0050] While the movable block 601 is adjusting the pitch by translation, it simultaneously drives the first sliding rod 606, which is fastened to it, to slide back and forth within the first oil tank 607. The first sliding rod 606 compresses the oil inside the first oil tank 607, and the pressurized oil is delivered to the cavities of the second oil tank 801 and the third oil tank 111 through the connecting hoses. The oil continuously flows into the second oil tank 801, raising the liquid level in its cavity. The hydraulic oil pushes the second sliding rod 802 to slide upward along the axial direction of the second oil tank 801. Due to the limiting sliding connection between the rotating ring 803 and the inner wall of the cavity opened in the base 2, the second oil tank 801 is rotatably connected to the inner wall of the cavity, allowing the second sliding rod 802 to slide upward. The rotating ring 803 is driven to rotate, and the rotating ring 803 has a guide groove 804 that moves in conjunction with the limiting post 805. This causes the rotating ring 803 to drive the sliding plate 9, which is fixed to the limiting post 805, to slide in the cavity of the fixed ring 7. Multiple sliding plates 9 work together to reduce the oil inlet diameter of the fixed ring 7 and narrow the oil inlet opening at the front end of the pipe 5. The viscosity of the insulating oil changes significantly with the oil temperature. When the oil temperature is low, the oil viscosity increases sharply. When the oil is fully loaded at high temperature, the oil becomes thinner and its fluidity increases significantly. At high temperature, the winding generates a lot of heat. The spiral reduces the spacing of the pipe 5 and extends the heat exchange stroke. At the same time, the opening of the pipe 5 is narrowed to limit the rapid flow of ultra-large flow thin oil and ensure that the oil stays in the winding for a sufficient time to absorb heat.

[0051] Hydraulic oil from the first oil tank 607 flows into the third oil tank 111 via a hose, pressurizing the oil and raising the third sliding rod 112. The third sliding rod 112 pulls the pull plate 113, causing it to shift. One end of the pull plate 113 is hinged to the rotating component 114, and the other end of the rotating component 114 is hinged to the inner wall of the cavity of the base 2. During the displacement of the pull plate 113, the pull plate 113, the rotating component 114, and the hinge point of the inner wall of the base 2 form a variable parallelogram linkage transmission structure. The change in the angle of the linkage is converted into a horizontal thrust, which pulls the push rod 115 to slide directionally along the inner cavity of the fixed seat 116. The push plate 12 at end 5 moves horizontally, and multiple push plates 12 are staggered on the outside of the sealing ring 10. Under high temperature conditions, the push plates 12 converge inward synchronously, reducing the sealed space enclosed by the push plates 12 and radially squeezing the sealing ring 10, thereby increasing the clamping force between the sealing ring 10 and the mounting surface of the fixing ring 7. Under low temperature conditions, the hydraulic pressure is released, the pull plate 113 is reversed and reset, the push plate 12 is released, and the pressure load on the sealing ring 10 is released synchronously, dynamically sealing and blocking the bypass oil leakage channel of the oil inlet, ensuring that all cold oil can only flow and exchange heat through the internal spiral pipe 5, and preventing cold oil from short-circuiting back to the oil tank from the sealing gap.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention are within the scope of the present invention.

Claims

1. A structure for enhancing the circulation of oil channels inside a transformer to reduce the temperature rise of high and low voltage windings, comprising a main body (1), characterized in that: The main body (1) is fixed with a base (2). Three high-voltage coils (3) are equally spaced inside the base (2). Each high-voltage coil (3) contains a low-voltage coil (4). A pipe (5) is provided between the high-voltage coils (3) and the low-voltage coils (4). The pipe (5) is spirally arranged. A pitch adjustment component is provided on one side of the pipe (5). The pitch of the pipe (5) is adjusted by the pitch adjustment component. A fixing ring (7) is provided at the lower end of the pipe (5). A flow adjustment component is provided inside the fixing ring (7). The flow adjustment component is equiangularly spaced inside the fixing ring (7). Multiple sliding plates (9) are provided, and the opening size of the fixed ring (7) is adjusted by moving the sliding plates (9) through the flow adjustment component. A sealing ring (10) is provided between the base (2) and the fixed ring (7). A sealing compensation component is provided outside the sealing ring (10). A push plate (12) is provided inside the sealing compensation component. The sealing amount of the sealing ring (10) is adjusted by moving the push plate (12) through the sealing compensation component. Multiple push plates (12) are equidistantly and alternately connected. The sealing ring (10) is movably connected to the push plate (12).

2. The structure for enhancing circulation in the internal oil channels of a transformer to reduce the temperature rise of high and low voltage windings according to claim 1, characterized in that: The spacing adjustment assembly includes a movable block (601) disposed on one side of the pipe (5), a movable plate (602) fixed at the bottom end of the movable block (601), a plurality of movable parts (604) slidably connected at equal intervals inside the movable plate (602), a slide rail (605) slidably connected to one side of the movable part (604), an electric telescopic rod fixed to one side of the movable block (601), a first sliding rod (606) fixed to the other side of the movable block (601), and a first oil tank (607) slidably connected to the outer wall of the first sliding rod (606).

3. The structure for enhancing circulation in the internal oil channels of a transformer to reduce the temperature rise of high and low voltage windings according to claim 2, characterized in that: The movable plate (602) has a sliding groove (603) that moves with the movable component (604), and the sliding grooves (603) are evenly spaced and arranged in parallel, extending obliquely from the lower left side to the upper right side of the movable plate (602). The base (2) has a cavity that moves with the movable block (601), and the slide rail (605) and the first oil tank (607) are fixedly connected to the inner wall of the cavity.

4. The structure for enhancing the circulation of internal oil channels in a transformer to reduce the temperature rise of high and low voltage windings according to claim 2, characterized in that: The flow regulating component includes a rotating ring (803) rotatably connected to the outer wall of the fixed ring (7). A second sliding rod (802) is fixed on one side of the rotating ring (803). A second oil tank (801) is slidably connected to the outer wall of the second sliding rod (802). A plurality of limiting posts (805) are slidably connected to the rotating ring (803) at equal angles. The limiting posts (805) are fixedly connected to the sliding plate (9).

5. The structure for enhancing circulation in the internal oil channels of a transformer to reduce the temperature rise of high and low voltage windings according to claim 4, characterized in that: The rotating ring (803) has a guide groove (804) that moves in conjunction with the limiting post (805), and the fixed ring (7) has a cavity that moves in conjunction with the protruding position of the sliding plate (9). The fixed ring (7) is fixedly connected to the base (2).

6. The structure for enhancing circulation in the internal oil channels of a transformer to reduce the temperature rise of high and low voltage windings according to claim 5, characterized in that: The base (2) has a cavity that moves in conjunction with the second oil tank (801) and the rotating ring (803). The rotating ring (803) is rotatably connected to the inner wall of the cavity, and the second oil tank (801) is rotatably connected to the protrusion on the inner wall of the cavity.

7. The structure for enhancing circulation in the internal oil channels of a transformer to reduce the temperature rise of high and low voltage windings according to claim 5, characterized in that: The sealing compensation assembly includes pull plates (113) that are equidistantly arranged outside the sealing ring (10). The bottom ends of two adjacent pull plates (113) are rotatably connected to rotating parts (114). A fixed seat (116) is provided at the bottom of the pull plate (113). A push rod (115) is slidably connected inside the fixed seat (116). One end of the push rod (115) is slidably connected to the pull plate (113), and the other end is slidably connected to the push plate (12).

8. The structure for enhancing circulation in the internal oil channels of a transformer to reduce the temperature rise of high and low voltage windings according to claim 7, characterized in that: A third sliding rod (112) is fixed at a protruding position on one side of one of the pull plates (113). The third sliding rod (112) is slidably connected to a third oil tank (111). The base (2) has a cavity that moves in conjunction with the third oil tank (111), the pull plate (113), and the push plate (12). The third oil tank (111) is rotatably connected to the inner wall of the cavity. The third oil tank (111) and the second oil tank (801) are connected to the moving block (601) through a hose.

9. The structure for enhancing circulation in the internal oil channels of a transformer to reduce the temperature rise of high and low voltage windings according to claim 7, characterized in that: The fixed seat (116) is fixedly connected to the inner wall of the cavity, the push plate (12) has a cavity that moves to cooperate with the push rod (115), and the sealing ring (10) is slidably connected to the push plate (12).

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