An oil-immersed transformer anti-leakage sealing structure

Abstract

The present application relates to a kind of oil-immersed transformer anti-leakage sealing structure, including transformer box body, the top of transformer box body is sealingly installed with sealing top plate, the top of sealing top plate is provided with multiple insulators, sealing mechanism is arranged between insulator and sealing top plate, sealing mechanism includes the sealing sleeve of being set in the inside of sealing top plate, the top of sealing top plate is provided with reinforcing part, the bottom of sealing sleeve is provided with inductive piece, the inside of sealing sleeve is provided with supplementary sealing piece, supplementary sealing piece includes the booster transmission ring of being slidably connected in the inside of sealing sleeve, the middle part of sealing sleeve is fixedly installed with multiple radial sealing pads.The present application realizes the effect that sealing strength is dynamically adjusted with internal oil pressure self-adaption, when the oil pressure in the box rises, supplementary strengthening anti-leakage sealing effect is achieved, so as to block the capillary leakage path of oil along the outer wall of insulator, when the oil pressure in the box falls back, reduce the fatigue wear caused by long-term high pressure compression of sealing piece, effectively prolong the service life of sealing piece.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a leak-proof sealing structure for oil-immersed transformers. Background Technology

[0002] Oil-immersed transformers are key equipment in power transmission and distribution systems, undertaking the core functions of voltage transformation and power transmission. They are widely used in various power application scenarios such as urban and rural power distribution networks, industrial and mining power distribution, and grid connection of new energy power plants. Their operational reliability directly determines the power supply stability and security of the power system. The connection between the insulator and the transformer's sealed top plate is the most common area for insulating oil leakage faults in oil-immersed transformers. The sealing structure at this location is the core protective unit that prevents insulating oil from leaking outward and isolates external moisture and impurities from entering the transformer's interior. Its sealing performance directly affects the transformer's insulation life, operation and maintenance costs, and operational safety.

[0003] Currently, for sealing the connection parts of insulators in oil-immersed transformers, the industry generally adopts a static sealing solution with fixed compression oil-resistant rubber gaskets and flange bolts pre-tightened. The gaskets are subjected to a preset fixed compression deformation by bolt tightening, which fills the microscopic gap between the insulator and the sealing top plate mating surface, thereby forming a sealing barrier to block the leakage path.

[0004] However, since the compression strength of the sealing structure in this type of solution is a fixed value, it cannot be adaptively and dynamically adjusted with the changes in the internal oil pressure of the transformer. It cannot simultaneously enhance the sealing effect when the transformer load increases, the oil temperature rises, leading to increased internal oil pressure and increased leakage risk, nor can it reduce the compression load of the seal when the oil pressure drops to reduce fatigue wear caused by long-term high-pressure compression. It is difficult to simultaneously ensure the reliability of leakage prevention under all operating conditions and the long service life of the seal. Summary of the Invention

[0005] The purpose of this invention is to provide a leak-proof sealing structure for oil-immersed transformers, aiming to improve the problem that some transformer sealing structures in the prior art cannot achieve adaptive dynamic adjustment with changes in the internal oil pressure of the transformer.

[0006] The objective of this invention is achieved through the following technical solution: a leak-proof sealing structure for an oil-immersed transformer, comprising a transformer housing, a sealing top plate being sealed and installed on the top of the transformer housing, a plurality of insulators being provided on the top of the sealing top plate, and a sealing mechanism being provided between the insulators and the sealing top plate; The sealing mechanism includes a sealing sleeve disposed inside the sealing top plate, a reinforcing member disposed at the top of the sealing top plate, a sensing element disposed at the bottom of the sealing sleeve, and a sealing element disposed inside the sealing sleeve. The sealing component includes a pressure-boosting drive ring slidably connected inside the sealing sleeve. Multiple radial sealing gaskets are fixedly installed in the middle of the sealing sleeve. Multiple wedge-shaped radial drive rings are slidably connected inside the radial sealing gaskets. Multiple oil pressure rings are slidably connected inside the radial sealing gaskets. The contact surfaces of the wedge-shaped radial drive rings and the oil pressure rings are both wedge-shaped surfaces and are tightly fitted to each other. A clamping oil seal bladder is provided on the inner side of the radial sealing gasket, and the shape of the clamping oil seal bladder is adapted to the outer annular groove of the insulator.

[0007] As a further description of the above technical solution: The two sides of the booster drive ring are configured with an elastic and retractable structure, and the two sides of the booster drive ring are always in close contact with the inside of the sealing sleeve. The wedge-shaped radial drive ring is connected to the booster drive ring by a round rod. As a further description of the above technical solution: The sensing element includes a sealing ring, a piston guide cavity is provided inside the sealing ring, and a floating piston ring is slidably connected inside the piston guide cavity. A weak stiffness return spring is provided between the top of the floating piston ring and the bottom of the piston guide cavity, and a floating airbag is installed at the bottom of the floating piston ring. As a further description of the above technical solution: The inside of the clamping oil seal bladder is filled with hydraulic oil, and the space between the bottom of the booster drive ring and the top of the floating piston ring is filled with high-pressure gas. As a further description of the above technical solution: The top diameter of the piston guide cavity gradually decreases from bottom to top, and the two sides of the booster drive ring are set as inclined surfaces, and the angle of the inclined surfaces is adapted to the angle of the inner inclined surface at the top of the piston guide cavity. As a further description of the above technical solution: The reinforcement includes multiple rotating rods rotatably connected to the sealing top plate. The outer sides of the four rotating rods in the same group are threadedly connected to a pressure plate. The top of the pressure plate is axially slidably connected to a drive wheel, and the drive wheel is rotatably connected to the top of the pressure plate. The outer side of the rotating rod is fixedly connected to a transmission gear, and the outer side of the rotating rod is also rotatably connected to a pawl via a torsion spring. As a further description of the above technical solution: The bottom shape of the clamping plate is adapted to the top shape of the sealing sleeve. The outer side of the top of the drive wheel is provided with a toothed groove, and the outer side of the transmission gear meshes with the outer toothed groove of the top of the drive wheel. The bottom outer side of the drive wheel is provided with a one-way ratchet, and the outer shape of the one-way ratchet is adapted to the outer shape of the pawl. As a further description of the above technical solution: The transformer box is equipped with heat dissipation fins on all four sides, pulleys at the bottom, and an oil tank and power connection point at the top of the sealed top plate.

[0008] Compared with the prior art, the advantages of the present invention are as follows: 1. The floating air bladder of the sensing element senses the changes in oil pressure inside the transformer box in real time, driving the floating piston ring to slide axially along the piston guide cavity inside the sealing ring. Through the cooperation of the inclined surface at the top of the piston guide cavity with the pressure transmission ring, the pressure transmission ring is driven to move axially synchronously along the inner wall of the sealing sleeve. Then, through the fixed round rod, the wedge-shaped radial drive ring moves synchronously. With the mutual contact of the wedge-shaped surfaces, the axial thrust is converted into radial thrust, driving the oil pressure ring to slide radially inward and squeeze and tighten the oil seal bladder. This achieves the effect of adaptive dynamic adjustment of sealing strength according to internal oil pressure. When the oil pressure inside the box increases, the clamping strength of the oil seal bladder increases accordingly, supplementing and strengthening the anti-leakage sealing effect, thereby blocking the capillary leakage path of oil along the outer wall of the insulator. When the oil pressure inside the box drops, the clamping strength of the oil seal bladder decreases synchronously, restoring the preset gap with the insulator, reducing fatigue wear caused by long-term high-pressure compression of the seal, and effectively extending the service life of the seal.

[0009] 2. By rotating the drive wheel of the reinforcing component, multiple sets of transmission gears meshing with it rotate synchronously, causing the coaxially fixed rotating rod to rotate around its own axis. Through the threaded engagement between the rotating rod and the pressure plate, the pressure plate moves axially downward to complete the axial pre-tightening of the sealing sleeve. At the same time, through the torsion spring, the pawl continuously engages with the one-way ratchet at the bottom of the drive wheel, restricting the reverse rotation of the drive wheel. This achieves the beneficial effects of stable pre-tightening and one-way anti-loosening locking of the sealing mechanism, effectively avoiding the attenuation of pre-tightening force under transportation and operation vibration conditions, ensuring the continuous fit of the sealing interface, and improving the sealing stability under all working conditions. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the main body of an embodiment of an oil-immersed transformer anti-leakage sealing structure proposed in this invention; Figure 2 This is a schematic diagram of the insulator structure of the anti-leakage sealing structure for an oil-immersed transformer proposed in this invention; Figure 3 This is a schematic diagram of the reinforcement component of the anti-leakage sealing structure for an oil-immersed transformer proposed in this invention; Figure 4 This is a schematic diagram of the sealing mechanism of an oil-immersed transformer anti-leakage sealing structure proposed in this invention; Figure 5 This is a schematic diagram of the inductor structure of an oil-immersed transformer anti-leakage sealing structure proposed in this invention; Figure 6 This is a schematic diagram of the piston guide cavity of an oil-immersed transformer anti-leakage sealing structure proposed in this invention; Figure 7This is a schematic diagram of the sealing component of an oil-immersed transformer anti-leakage sealing structure proposed in this invention; Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0011] Labeling Explanation: 1. Transformer housing; 2. Heat dissipation fins; 3. Pulley; 4. Sealing top plate; 5. Insulator; 6. Sealing mechanism; 61. Reinforcing component; 611. Rotating rod; 612. Pressing plate; 613. Drive wheel; 614. Pawl; 615. Transmission gear; 62. Sealing sleeve; 63. Induction element; 631. Sealing ring; 632. Floating piston ring; 633. Floating airbag; 634. Piston guide cavity; 635. Weak stiffness return spring; 64. Re-sealing component; 641. Pressure boosting transmission ring; 642. Radial sealing gasket; 643. Wedge-shaped radial drive ring; 644. Oil pressure ring; 645. Clamping oil seal bladder; 7. Oil tank; 8. Grounding post. Detailed Implementation

[0012] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figures 1 to 8 The diagram shows an embodiment of an oil-immersed transformer anti-leakage sealing structure provided by the present invention. The structure includes a transformer housing 1, which houses the core electrical components and insulating oil of the transformer, providing a closed protective space and installation foundation for the overall structure. A sealing top plate 4 is sealed on the top of the transformer housing 1, providing a closed protection for the top of the housing, a stable positioning reference for the upper installed components, and blocking the main leakage path at the top of the housing. Multiple insulators 5 are installed on the top of the sealing top plate 4, providing electrical connection and high-voltage insulation protection for the internal and external lines of the transformer, and a mating positioning interface for the radial sealing structure. A sealing mechanism 6 is provided between the insulators 5 and the sealing top plate 4, providing full-link anti-leakage sealing protection at the mating point of the insulators 5 and the sealing top plate 4, integrating multi-dimensional sealing functions, and blocking the core leakage path at this location.

[0013] The transformer enclosure 1 is equipped with heat dissipation fins 2 on all four sides. The heat dissipation fins 2 are used to dissipate heat from the insulating oil inside the transformer, stabilize the oil temperature and pressure inside the enclosure, and reduce the working load on the sealing structure. The bottom of the transformer enclosure 1 is equipped with pulleys 3. The pulleys 3 are used to facilitate the overall transportation of the transformer, reduce the difficulty of relocation during equipment transportation and installation, and improve site adaptability. The top of the sealed top plate 4 is equipped with an oil tank 7 and a grounding post 8. The oil tank 7 is used to store and compensate the volume of the transformer insulating oil, balance the oil level changes caused by oil temperature fluctuations, and stabilize the basic oil pressure inside the enclosure. The grounding post 8 is used to facilitate the connection and fixation of the low-voltage side lines of the transformer, providing a stable electrical connection interface for the power distribution circuit.

[0014] The sealing mechanism 6 includes a sealing sleeve 62 disposed inside the sealing top plate 4. The sealing sleeve 62 is used to integrate and support the various functional components of the sealing mechanism 6, provide a guiding reference for the internal moving parts, and isolate the sealing components from external environmental corrosion. A reinforcing member 61 is provided on the top of the sealing top plate 4. The reinforcing member 61 is used to axially pre-tighten and fix the sealing sleeve 62, provide a one-way anti-loosening locking function, and maintain the installation stability of the sealing mechanism 6. A sensing element 63 is provided at the bottom of the sealing sleeve 62. The sensing element 63 is used to realize the real-time sensing of changes in oil pressure inside the transformer tank and provide power input for adaptive sealing adjustment. A sealing reinforcement 64 is provided inside the sealing sleeve 62. The sealing reinforcement 64 is used to achieve double sealing protection at the mating point between the insulator 5 and the sealing top plate 4, can dynamically adjust the sealing strength, and block the core path of oil leakage.

[0015] The sealing component 64 includes a pressure-boosting transmission ring 641 slidably connected inside the sealing sleeve 62. The pressure-boosting transmission ring 641 is used to transmit and convert inductive power, providing a stable transmission input for adjusting the sealing strength and ensuring synchronous operation. Multiple radial sealing gaskets 642 are fixedly installed in the middle of the sealing sleeve 62. The radial sealing gaskets 642 are used to achieve basic static sealing protection between the sealing sleeve 62 and the insulator 5, providing installation space for the internal drive components. Multiple wedge-shaped radial drive rings 643 are slidably connected inside the radial sealing gaskets 642. The wedge-shaped radial drive rings 643 are used for... To achieve the conversion and amplification of axial thrust into radial clamping force, providing a stable driving force for the radial sealing structure, the two sides of the booster drive ring 641 are set with elastic and retractable structures. The elastic and retractable structures are used to achieve continuous contact and sealing between the booster drive ring 641 and the inner wall of the sealing sleeve 62, ensuring the sealing performance of the transmission cavity. The two sides of the booster drive ring 641 are always in close contact with the inside of the sealing sleeve 62. The wedge-shaped radial drive ring 643 is connected to the booster drive ring 641 through a round rod. The round rod is used to achieve rigid connection and positioning between components, ensuring the synchronization of transmission actions and avoiding stroke deviation.

[0016] Multiple pressure oil rings 644 are radially slidably connected inside the radial sealing gasket 642. The pressure oil rings 644 are used to achieve uniform transmission of radial clamping force and provide stable squeezing force for the sealing bladder. The contact surfaces of the wedge-shaped radial drive ring 643 and the pressure oil rings 644 are both wedge-shaped and tightly fitted to each other. The wedge-shaped surfaces are used to achieve smooth conversion of axial force to radial force, amplify the clamping force, and improve the sensitivity of seal adjustment. The inner side of the radial sealing gasket 642 is provided with a clamping oil seal bladder 645, and the clamping oil seal bladder 645 is adapted to the shape of the outer annular groove of the insulator 5. The clamping oil seal bladder 645 is used to achieve radial dynamic sealing protection of the outer wall of the insulator 5, blocking the capillary leakage path of oil along the outer wall of the insulator 5. The inside of the clamping oil seal bladder 645 is filled with hydraulic oil. The hydraulic oil is used to achieve uniform transmission of clamping force, ensure the uniformity of deformation of the sealing bladder, and improve the integrity of the seal fit.

[0017] The sensing element 63 includes a sealing ring 631, which is used to integrate and support the various components of the sensing element 63, provide a closed cavity for piston movement, and provide bottom positioning support. The sealing ring 631 has a piston guide cavity 634 inside, which is used to guide the piston components and limit their stroke, ensuring smooth axial sliding and avoiding jamming. The top diameter of the piston guide cavity 634 gradually decreases from bottom to top, and the two sides of the booster transmission ring 641 are set as inclined surfaces, and the angle of the inclined surface is adapted to the angle of the inner inclined surface at the top of the piston guide cavity 634. The adapted inclined surface is used to realize the smooth transmission and guidance of axial thrust, ensuring the stability of the transmission process.

[0018] A floating piston ring 632 is slidably connected inside the piston guide cavity 634. The floating piston ring 632 is used to receive and convert the hydraulic force, converting hydraulic pressure changes into axial mechanical action to provide power for the adaptive seal. The bottom of the booster transmission ring 641 and the top of the floating piston ring 632 are filled with high-pressure gas. The high-pressure gas is used to buffer and compensate for pressure during the transmission process, absorb the impact of hydraulic pressure fluctuations, and ensure the stability of the seal adjustment. A weak stiffness return spring 635 is set between the top of the floating piston ring 632 and the bottom of the piston guide cavity 634. The weak stiffness return spring 635 is used to realize the automatic reset of the piston component. When the hydraulic pressure drops, the seal reinforcement state is released, reducing the fatigue wear of the seal. A floating airbag 633 is installed at the bottom of the floating piston ring 632. The floating airbag 633 is used to realize the real-time sensing and isolation of the hydraulic pressure inside the housing, smoothly transmit the hydraulic force, and ensure the cleanliness of the transmission components.

[0019] The reinforcement component 61 includes multiple rotating rods 611 rotatably connected to the sealing top plate 4. The rotating rods 611 are used to convert rotational motion into linear motion, providing a stable axial preload for the sealing sleeve 62. A clamping plate 612 is threadedly connected to the outer side of the four rotating rods 611 in the same group. The clamping plate 612 is used to achieve uniform axial clamping of the top of the sealing sleeve 62, ensuring uniform contact of the sealing interface. A drive wheel 613 is axially slidably connected to the top of the clamping plate 612, and the drive wheel 613 is rotatably connected to the top of the clamping plate 612. The drive wheel 613 is used to realize multiple sets of rotational... The synchronous rotation drive of the moving rod 611 ensures the synchronicity of the pre-tightening action and avoids clamping deviation. A transmission gear 615 is fixedly connected to the outside of the rotating rod 611. The transmission gear 615 is used to realize the transmission of rotational motion between the drive wheel 613 and the rotating rod 611, ensuring the consistency of the actions of multiple components. A pawl 614 is also rotatably connected to the outside of the rotating rod 611 through a torsion spring. The torsion spring is used to realize the automatic reset and continuous engagement of the pawl 614, ensuring the meshing stability of the locking structure. The pawl 614 is used to realize the one-way locking limit of the drive wheel 613 and avoid the pre-tightening force decay.

[0020] The bottom shape of the clamping plate 612 is adapted to the top shape of the sealing sleeve 62. The top outer side of the drive wheel 613 is provided with a toothed groove, and the outer side of the transmission gear 615 meshes with the toothed groove on the top outer side of the drive wheel 613. The toothed groove is used to realize the stable meshing transmission between the drive wheel 613 and the transmission gear 615, ensuring the smooth transmission of rotational power. The bottom outer side of the drive wheel 613 is provided with a one-way ratchet, and the outer shape of the one-way ratchet is adapted to the outer shape of the pawl 614. The one-way ratchet is used to lock with the pawl 614, restricting the reverse rotation of the drive wheel 613 and preventing the pre-tightening from loosening under vibration conditions.

[0021] Working principle: First, the overall assembly and positioning of the oil-immersed transformer anti-leakage sealing structure is completed. First, the sealing top plate 4 is sealed and installed on the top of the transformer box 1. Multiple insulators 5 are installed in the corresponding mounting positions of the sealing top plate 4. Then, the sealing mechanism 6 is assembled to the mating point between the insulators 5 and the sealing top plate 4. During the assembly process, the sealing sleeve 62 is first sleeved on the outer periphery of the insulator 5 and fixed inside the mounting hole of the sealing top plate 4. Then, the reinforcing component 61 is assembled to the position of the sealing top plate 4 corresponding to the sealing sleeve 62. Subsequently, the sensing component 63 is assembled to the bottom of the sealing sleeve 62. Finally, the pressure boosting drive ring 641, radial sealing gasket 642, wedge-shaped radial drive ring 643, oil pressure ring 644, and clamping oil seal 645 of the sealing component 64 are sequentially assembled to the inside of the sealing sleeve 62, completing the initial positioning of all components.

[0022] After the overall assembly is completed, the initial pre-tightening operation of the sealing mechanism 6 is performed. The drive wheel 613 of the reinforcing member 61 is rotated. Through the toothed groove on the outer side of the top of the drive wheel 613, multiple sets of transmission gears 615 meshing with it rotate synchronously. The transmission gears 615 drive the coaxially fixed rotating rod 611 to rotate around its own axis. Through the threaded engagement between the outer side of the rotating rod 611 and the pressure plate 612, the pressure plate 612 is driven to move downward along the axial direction of the rotating rod 611, so that the bottom of the pressure plate 612 fits against the top of the sealing sleeve 62 and completes axial clamping. During the rotation of the drive wheel 613, the pawl 614 connected by the torsion spring on the outer side of the rotating rod 611 continuously engages with the one-way ratchet on the outer side of the bottom of the drive wheel 613, restricting the reverse rotation of the drive wheel 613 and completing the one-way locking in the pre-tightening state.

[0023] When the transformer enters normal no-load or low-load operating conditions, the insulating oil inside the transformer housing 1 is in a rated slightly positive pressure state. At this time, the floating air bladder 633 at the bottom of the inductor 63 is in direct contact with the insulating oil inside the transformer housing 1. Under the action of its own weight and the elastic force of the weak stiffness return spring 635, the floating piston ring 632 is in the initial position of the lower limit of the piston guide cavity 634 inside the sealing ring 631. The boosting transmission ring 641 is in the initial position of the lower limit inside the sealing sleeve 62. The wedge-shaped radial drive ring 643 and the oil pressure ring 644 are both in the initial position of radial retraction. The clamping oil seal bladder 645 and the annular groove on the outside of the insulator 5 maintain a preset initial gap. The radial sealing gasket 642 maintains the initial basic sealing state. The entire sealing mechanism 6 is in the basic sealing condition.

[0024] When the transformer enters a high-load operating condition, or when the ambient temperature rises, causing the insulating oil inside the transformer tank 1 to heat up and expand in volume, resulting in increased oil pressure inside the tank, the increased oil pressure directly acts on the floating air bladder 633, pushing the floating piston ring 632 to slide upward along the inner wall of the piston guide cavity 634. Simultaneously, it compresses the weak stiffness return spring 635 between the top of the floating piston ring 632 and the inner wall of the piston guide cavity 634. During the upward sliding process of the floating piston ring 632, the inclined surfaces on both sides of the booster transmission ring 641, which are adapted to each other, cooperate to push the booster transmission ring 641 to slide upward along the inner wall of the sealing sleeve 62. The elastic and extensible structure on both sides of the booster transmission ring 641 always keeps in contact with the inner wall of the sealing sleeve 62 during the sliding process. At the same time, the high-pressure gas between the booster transmission ring 641 and the floating piston ring 632 adjusts its pressure synchronously with the change of cavity volume, maintaining the stability of the transmission process.

[0025] As the booster drive ring 641 slides upward along the inner wall of the sealing sleeve 62, it drives the wedge-shaped radial drive ring 643 to move upward synchronously through the fixedly connected round rod. When the wedge-shaped radial drive ring 643 moves upward, it pushes the pressure oil ring 644 to slide inward along the radial direction of the insulator 5 through the mutually close wedge-shaped surfaces. During the inward sliding process, the pressure oil ring 644 continuously squeezes the clamping oil seal 645 on the inner side of the radial sealing gasket 642, causing the clamping oil seal 645 filled with hydraulic oil to undergo radial deformation and fit into the annular groove on the outer side of the insulator 5, thus completing the adaptive reinforcement of the radial seal. At the same time, during the upward movement of the booster drive ring 641, it simultaneously squeezes the radial sealing gasket 642, thus completing the adaptive reinforcement of the axial seal.

[0026] When the transformer load decreases, or the ambient temperature drops, causing the temperature of the insulating oil inside the transformer housing 1 to decrease and its volume to shrink, resulting in a drop in the oil pressure inside the housing, the oil pressure thrust acting on the floating air bladder 633 decreases synchronously. Under the rebound force of the weak stiffness return spring 635, the floating piston ring 632 slides downward along the inner wall of the piston guide cavity 634 to reset, driving the booster transmission ring 641 to slide downward along the inner wall of the sealing sleeve 62 to reset. When the booster transmission ring 641 slides downward, it drives the wedge-shaped radial drive ring 643 to move downward synchronously through the round rod, releasing the radial thrust of the wedge-shaped surface on the pressure oil ring 644. The pressure oil ring 644 slides outward along the radial direction of the insulator 5 to reset, releasing the squeezing effect on the clamping oil seal bladder 645. The clamping oil seal bladder 645 returns to its initial shape under its own elasticity, and the preset initial gap between it and the annular groove on the outside of the insulator 5 is restored. The entire sealing mechanism 6 returns to the basic sealing condition.

[0027] When the transformer experiences vibration or bumps during transportation, installation, or operation, the pawl 614 of the reinforcement 61 and the one-way ratchet remain locked, restricting the reverse rotation of the drive wheel 613 and maintaining the axial clamping force of the clamping plate 612 on the sealing sleeve 62 to prevent axial movement of the sealing sleeve 62. At the same time, multiple sets of circumferentially evenly distributed clamping oil seals 645 adaptively adjust their deformation according to the radial deviation of the insulator 5 to maintain the continuous fit of the sealing interface.

Claims

1. A leak-proof sealing structure for an oil-immersed transformer, comprising a transformer housing (1), characterized in that: The transformer box (1) is sealed with a sealing top plate (4), and multiple insulators (5) are provided on the top of the sealing top plate (4). A sealing mechanism (6) is provided between the insulators (5) and the sealing top plate (4). The sealing mechanism (6) includes a sealing sleeve (62) disposed inside the sealing top plate (4), a reinforcing member (61) is disposed on the top of the sealing top plate (4), a sensing element (63) is disposed on the bottom of the sealing sleeve (62), and a sealing element (64) is disposed inside the sealing sleeve (62). The sealing component (64) includes a pressure-boosting drive ring (641) that is slidably connected inside the sealing sleeve (62). Multiple radial sealing gaskets (642) are fixedly installed in the middle of the sealing sleeve (62). Multiple wedge-shaped radial drive rings (643) are slidably connected inside the radial sealing gaskets (642). Multiple oil pressure rings (644) are slidably connected inside the radial sealing gaskets (642). The contact surfaces of the wedge-shaped radial drive rings (643) and the oil pressure rings (644) are both wedge-shaped and tightly attached to each other. A clamping oil seal bladder (645) is provided on the inner side of the radial sealing gaskets (642), and the clamping oil seal bladder (645) is adapted to the shape of the outer annular groove of the insulator (5).

2. The leak-proof sealing structure for an oil-immersed transformer according to claim 1, characterized in that: The two sides of the booster drive ring (641) are configured as elastic and retractable structures, and the two sides of the booster drive ring (641) are always in close contact with the inside of the sealing sleeve (62). The wedge-shaped radial drive ring (643) and the booster drive ring (641) are connected by a round rod.

3. The leak-proof sealing structure for an oil-immersed transformer according to claim 1, characterized in that: The sensing element (63) includes a sealing ring (631), a piston guide cavity (634) is provided inside the sealing ring (631), and a floating piston ring (632) is slidably connected inside the piston guide cavity (634). A weak stiffness return spring (635) is provided between the top of the floating piston ring (632) and the bottom of the piston guide cavity (634), and a floating airbag (633) is installed at the bottom of the floating piston ring (632).

4. The leak-proof sealing structure for an oil-immersed transformer according to claim 3, characterized in that: The interior of the clamping oil seal bladder (645) is filled with hydraulic oil, and the space between the bottom of the booster drive ring (641) and the top of the floating piston ring (632) is filled with high-pressure gas.

5. The leak-proof sealing structure for an oil-immersed transformer according to claim 3, characterized in that: The top aperture of the piston guide cavity (634) gradually decreases from bottom to top, and the two sides of the booster transmission ring (641) are set as inclined surfaces, and the angle of the inclined surfaces is adapted to the angle of the inner inclined surface at the top of the piston guide cavity (634).

6. The leak-proof sealing structure for an oil-immersed transformer according to claim 1, characterized in that: The reinforcement component (61) includes multiple rotating rods (611) rotatably connected to the sealing top plate (4). The outer sides of the four rotating rods (611) in the same group are threadedly connected to a pressure plate (612). The top of the pressure plate (612) is axially slidably connected to a drive wheel (613), and the drive wheel (613) is rotatably connected to the top of the pressure plate (612). The outer side of the rotating rod (611) is fixedly connected to a transmission gear (615), and the outer side of the rotating rod (611) is also rotatably connected to a pawl (614) via a torsion spring.

7. The leak-proof sealing structure for an oil-immersed transformer according to claim 6, characterized in that: The bottom shape of the clamping plate (612) is adapted to the top shape of the sealing sleeve (62). The drive wheel (613) has a toothed groove on the outer side of the top, and the outer side of the transmission gear (615) meshes with the toothed groove on the outer side of the top of the drive wheel (613). The bottom outer side of the drive wheel (613) has a one-way ratchet, and the outer shape of the one-way ratchet is adapted to the outer shape of the pawl (614).

8. The anti-leakage sealing structure for an oil-immersed transformer according to claim 1, characterized in that: The transformer box (1) is provided with heat dissipation fins (2) on all four sides, and pulleys (3) are provided at the bottom of the transformer box (1). An oil tank (7) and a power connection pile (8) are provided at the top of the sealed top plate (4).

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