Outdoor immersion type environment-friendly gas power transformer

Abstract

The present application relates to the technical field of power equipment, in particular to an outdoor immersed environment-friendly gas power transformer, comprising a high-voltage bushing. The high-voltage bushing comprises an insulating sleeve, a capacitor core and a flow assembly. The flow assembly is used to drive the circulating flow of the insulating medium between the coaxially arranged capacitor core and the insulating sleeve. The circulating flow of the insulating medium can quickly continuously take away the heat generated by the capacitor core during operation and dissipate through the wall surface of the insulating sleeve, greatly improving the heat dissipation efficiency, effectively reducing the working temperature of the capacitor core and slowing down the thermal aging of the insulating medium. At the same time, the circulating flow of the insulating medium breaks the thermal boundary layer, making the axial and circumferential temperature distribution more uniform, and avoiding the insulation deterioration caused by local overheating.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to an outdoor immersion environmentally friendly gas power transformer. Background Technology

[0002] A transformer is a core electrical device operating on the principle of electromagnetic induction. It mainly consists of an iron core, windings, an oil tank, and protective devices. Its core purpose is to step up or down AC voltage, regulate current, and achieve safe energy transmission without changing the power supply frequency. Transformers are fundamental equipment in power transmission and distribution systems, widely used in industry, agriculture, urban communities, and power transmission networks. High-voltage bushings are critical accessories for transformers and other high-voltage equipment. They are used to connect the transformer to the external power grid, while also providing electrical insulation, withstanding mechanical stress, and isolating external environmental interference. In power transmission, the electricity generated by the power plant needs to be stepped up by a step-up transformer to reduce transmission losses, and then stepped down by a step-down transformer at the destination. High-voltage bushings provide a safe exit path for the transformer's high-voltage leads, ensuring electrical safety and stable operation of the equipment in high-voltage environments.

[0003] Traditional high-voltage bushings use insulating oil as the insulating medium, filling the space between the capacitor core and the insulating sleeve, relying on natural convection for heat dissipation. However, the capacitor core continuously generates heat during operation, and the natural convection flow rate generated by the thermal motion of the insulating oil is extremely slow. Heat cannot be quickly conducted to the insulating sleeve for dissipation, easily causing heat accumulation around the capacitor core and forming a thick thermal boundary layer on the inner wall of the insulating sleeve, significantly reducing heat exchange efficiency. Simultaneously, the extremely slow-flowing insulating oil is prone to aging and deterioration, adhering to the inner wall of the sleeve, exacerbating thermal resistance, reducing the insulating performance of the insulating oil, and affecting the operational stability and service life of the high-voltage bushing and transformer. Summary of the Invention

[0004] Therefore, it is necessary to provide an outdoor immersed environmentally friendly gas power transformer to address the problem of extremely slow insulating oil flow in the high-voltage bushings of current transformers.

[0005] The above objectives are achieved through the following technical solutions: An outdoor immersion environmentally friendly gas power transformer includes a high-voltage bushing, which comprises an insulating sleeve, a capacitor core, and a flow assembly. The capacitor core is disposed inside the insulating sleeve and coaxially arranged with the insulating sleeve. An insulating medium is filled between the capacitor core and the insulating sleeve. The flow assembly is used to drive the insulating medium to circulate between the capacitor core and the insulating sleeve.

[0006] Furthermore, the flow assembly includes an isolation cylinder and a driving member. The isolation cylinder is sleeved outside the capacitor core and abuts against the inner wall of the insulating sleeve. The isolation cylinder is used to form an annular flow gap between the capacitor core and the insulating sleeve. The driving member is used to drive the insulating medium to circulate along the axial direction of the insulating sleeve within the flow gap.

[0007] Furthermore, a plurality of elastic support members are provided between the insulating sleeve and the capacitor core. The plurality of elastic support members are distributed at intervals along the circumference. The elastic support members are fixedly connected to the isolation cylinder. The elastic support members are used to provide elastic buffer when the capacitor core is heated and expanded.

[0008] Furthermore, the insulating sleeve is provided with a partition structure, which is used to divide the flow gap into two circumferentially distributed flow channels.

[0009] The driving component includes two power units, each power unit being configured corresponding to one of the flow channels, and the two power units being used to drive the insulating medium to flow in opposite directions within the two flow channels.

[0010] Furthermore, the power unit includes a piston plate, a telescopic member, and a power source; each piston plate is slidably disposed within one of the flow channels; the first end of the telescopic member is connected to the piston plate; the power source is connected to the second end of the telescopic member through a connecting pipe, and the power source is used to drive the piston plate to reciprocate along the axial direction of the insulating sleeve.

[0011] The piston plate is provided with a one-way valve, and the one-way valves on the piston plates in the two flow channels have opposite conduction directions.

[0012] Furthermore, the power unit also includes a compensation component, which is used to compensate for the volume change of the insulating medium caused by temperature changes.

[0013] Furthermore, the compensation component includes a compensation tube, which is capable of telescoping along its own axis and is coaxially sleeved on the outside of the connecting tube; the portion of the connecting tube located inside the compensation tube has a reserved length so that the connecting tube remains in a relaxed state when the compensation tube is stretched to its maximum length.

[0014] Furthermore, the flow assembly also includes a cleaning unit, which is used to clean the inner wall of the insulating sleeve when the insulating medium is circulating.

[0015] Furthermore, the cleaning unit includes multiple scrapers and a rotating structure. The multiple scrapers are spaced apart circumferentially, and each scraper is fixedly connected to the isolation cylinder. The sidewall of the scraper contacts the inner wall of the insulating sleeve. The rotating structure is used to drive the scraper to rotate relative to the insulating sleeve during the circulation of the insulating medium.

[0016] Furthermore, the rotating structure includes a guide block and a spiral groove. The guide block is disposed on the piston plate; the spiral groove is disposed on the inner wall of the isolation cylinder. The guide block and the spiral groove are slidably engaged to drive the isolation cylinder to rotate around the axis of the insulating sleeve when the piston plate moves axially.

[0017] The beneficial effects of this invention are: This invention provides an outdoor immersed environmentally friendly gas-fired power transformer, including a high-voltage bushing comprising an insulating sleeve, a capacitor core, and a flow assembly. The flow assembly provides active power for the flow of the insulating medium, driving it to form a continuous directional circulation within the annular flow gap between the capacitor core and the insulating sleeve. This allows the insulating medium to continuously flow over the heating surface of the capacitor core, rapidly absorbing the heat generated during operation, preventing the formation of a thermal boundary layer on the inner wall of the insulating sleeve, effectively reducing the overall operating temperature of the capacitor core, and minimizing thermal aging of the insulating medium due to prolonged high temperatures. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an outdoor immersion environmentally friendly gas power transformer provided in an embodiment of the present invention; Figure 2 for Figure 1 Side view of the structure shown; Figure 3 for Figure 1 Top view of the structure shown; Figure 4 This is a schematic diagram of the structure of a high-voltage bushing in an outdoor immersed environmentally friendly gas power transformer, provided as an embodiment of the present invention. Figure 5 for Figure 4 Exploded view of the structure shown; Figure 6 for Figure 4 Cross-sectional view of the structure shown; Figure 7 for Figure 4 The cross-sectional view of the structure shown is from another perspective; the capacitor core has been hidden for easier observation. Figure 8 for Figure 6 A magnified view of a section at point A in the middle; Figure 9 for Figure 6Cross-sectional view along the BB direction; Figure 10 for Figure 7 A magnified view of a section at point C; Figure 11 for Figure 8 A magnified view of a section at point D; Figure 12 for Figure 9 A magnified view of a section at point E in the middle; Figure 13 This is a schematic diagram of the isolation cylinder in a high-voltage bushing; Figure 14 This is a structural schematic diagram of the piston plate, expansion joint, connecting pipe, and compensation pipe in a high-pressure bushing. Figure 15 This is a schematic diagram of the mounting base in a high-pressure bushing.

[0019] in: 110. Gas box; 120. External oil-immersed on-load switch; 130. Aluminum radiator; 131. Upper heat dissipation pipe; 132. Lower heat dissipation pipe; 140. Low-voltage outgoing line enclosed device; 141. Epoxy low-voltage bushing; 150. High-voltage outgoing line sleeve; 210. Insulating sleeve; 211. Upper insulating section; 212. Lower insulating section; 213. Terminal block; 214. Equalizing ball; 215. Isolating plate; 216. Isolating strip; 220. Mounting flange; 230. Conductive rod; 240. Capacitor core; 250. Oil conservator; 310. Isolation cylinder; 311. Elastic support component; 312. Scraper; 313. Spiral groove; 320. Piston plate; 321. One-way valve; 322. Guide block; 330. Telescopic component; 331. Sliding outer cylinder; 332. Sliding inner cylinder; 333. Vent hole; 340. Connecting pipe; 350. Mounting base; 351. Compensation pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] The following reference Figures 1 to 15 This invention describes an outdoor immersion environmentally friendly gas power transformer, comprising a gas tank 110, an external oil-immersed on-load switch 120, an aluminum radiator 130, an upper heat dissipation pipe 131, a lower heat dissipation pipe 132, a low-voltage outgoing line enclosed device 140, an epoxy low-voltage bushing 141, a high-voltage outgoing line sleeve 150, and a high-voltage bushing.

[0024] The gas chamber 110 is fixedly placed on the ground or other fixed support surface. Inside the gas chamber 110 are core working components such as the high-voltage winding, low-voltage winding, and iron core. The chamber wall of the gas chamber 110 adopts a reinforced structure to withstand the rated pressure required for the operation of the internal environmentally friendly gas. The gas chamber 110 provides a sealed and stable working environment, ensuring that the internal environmentally friendly gas always maintains the set pressure and purity, providing the basic conditions for the safe operation of the internal electrical components.

[0025] The external oil-immersed on-load tap changer 120 is a sealed oil tank structure, independently installed outside the gas tank 110. The external oil-immersed on-load tap changer 120 is electrically connected to the high-voltage winding of the transformer body via dedicated leads. The external oil-immersed on-load tap changer 120 is filled with high-flammability natural ester vegetable oil, which serves as the insulation and arc-quenching medium. The external oil-immersed on-load tap changer 120 completely isolates the arc and heat generated by the switch operation from the environmentally friendly gas inside the gas tank 110, improving the safety and reliability of the entire transformer equipment operation.

[0026] The aluminum radiator 130 is a high-efficiency heat dissipation element made of aluminum alloy. It increases the heat dissipation surface area and efficiently dissipates heat from the circulating environmentally friendly gas into the surrounding air through both convection and radiation. The upper heat dissipation pipe 131 and the lower heat dissipation pipe 132 are fluid channels fixedly connected to the gas tank 110. Both pipes communicate with the environmentally friendly gas inside the gas tank 110. Together with the aluminum radiator 130, they form a natural convection circulation heat dissipation path. During heat dissipation, the heated gas inside the gas tank 110 rises into the upper heat dissipation pipe 131, is cooled by the aluminum radiator 130, and then descends into the lower heat dissipation pipe 132, eventually returning to the gas tank 110. This forms a continuous and stable heat dissipation cycle, ensuring that the temperature rise of the transformer under rated load is controlled within the allowable range.

[0027] The low-voltage outgoing line enclosed device 140 is located above the gas box 110. The low-voltage outgoing line enclosed device 140 is used for the enclosed outgoing and safety protection of low-voltage side electrical energy, preventing external dust, moisture, and other impurities from entering the low-voltage outgoing line. The epoxy low-voltage bushing 141 is a fully sealed structure cast from epoxy resin and is fixedly installed above the gas box 110. The low-voltage conductive connector inside the epoxy low-voltage bushing 141 is electrically connected to the low-voltage winding inside the gas box 110. The epoxy low-voltage bushing 141 provides a high-protection-level connection interface for low-voltage electrical energy output. The epoxy low-voltage bushing 141 can maintain a certain positive pressure environmentally friendly gas environment. This positive pressure environmentally friendly gas environment further ensures the insulation reliability of the epoxy low-voltage bushing 141 and prevents external moisture and impurities from affecting the insulation performance.

[0028] The high-voltage outlet sleeve 150 has a cylindrical structure and is fixedly connected to the gas box 110. The high-voltage outlet sleeve 150 is used to provide a stable installation carrier and positioning reference for the high-voltage bushing, and at the same time realizes the sealed connection between the high-voltage bushing and the gas box 110 to prevent the leakage of environmentally friendly gas inside the gas box 110.

[0029] The high-voltage bushing includes an insulating sleeve 210, a mounting flange 220, a conductive rod 230, a capacitor core 240, and an oil conservator 250.

[0030] The insulating sleeve 210 is a cylindrical structure made of high-strength insulating material, coaxially installed inside the high-voltage outgoing sleeve 150. The insulating sleeve 210 is divided into an upper insulating section 211 and a lower insulating section 212 along its own axis. The outer wall of the upper insulating section 211 has a multi-segment shed structure, which increases the creepage distance and effectively prevents surface flashover under high-voltage electric fields, ensuring the external insulation performance of the insulating sleeve 210. A mounting flange 220 is fixedly connected to the connection between the upper insulating section 211 and the lower insulating section 212 of the insulating sleeve 210, used to fix the insulating sleeve 210 to the gas box 110. The upper insulating section 211 of the insulating sleeve 210 is located outside the gas box 110, and the lower insulating section 212 is located inside the gas box 110. The conductive rod 230 is a current path made of highly conductive metal, coaxially fixed to the insulating sleeve 210, providing a unique channel for the transmission of high-voltage current. The capacitor core 240 is an insulating assembly formed by stacking multiple capacitor plates. The capacitor core 240 is coaxially and tightly fitted around the conductive rod 230. The capacitor core 240 serves to uniformly distribute the electric field around the conductive rod 230, reduce local electric field intensity, and prevent breakdown damage to the insulating medium due to electric field concentration. The oil conservator 250 is a cylindrical sealed structure, coaxially arranged with the insulating sleeve 210. The interior of the oil conservator 250 is filled with a highly insulating insulating medium. The interior of the oil conservator 250 is connected to the interior of the insulating sleeve 210. The insulating medium fills the gap between the capacitor core 240 and the insulating sleeve 210, enhancing the insulation performance inside the insulating sleeve 210 and absorbing the heat generated during the operation of the capacitor core 240.

[0031] A terminal block 213 is provided at the upper end of the upper insulating section 211. The terminal block 213 electrically connects the upper end of the conductive rod 230 to an external conductor or busbar. The terminal block 213 also serves as a top seal and a connection to external electrical components, preventing leakage of the insulating medium and intrusion of external impurities. A voltage equalizing ball 214 is fixedly provided at the lower end of the lower insulating section 212. The voltage equalizing ball 214 is electrically connected to the lower end of the conductive rod 230 and is connected to the high-voltage winding inside the gas box 110 via a high-voltage lead from the reactor body. The voltage equalizing ball 214 is located entirely inside the gas box 110 and is used to even out the electric field distribution at the end of the conductive rod 230 inside the gas box 110, preventing partial discharge of the environmentally friendly gas inside the gas box 110.

[0032] High-voltage current is transmitted to the equalizing sphere 214 through the high-voltage lead of the transformer body. The equalizing sphere 214 equalizes the electric field of the high-voltage current and then guides it into the conductive rod 230. The high-voltage current is transmitted upward along the axial direction of the conductive rod 230 and is finally output to the external conductor or busbar through the terminal 213. During the entire high-voltage current transmission process, the insulating sleeve 210 provides double insulation protection, completely blocking the electrical connection between the conductive rod 230 and the outside world and the gas box 110 shell. The insulating medium is filled between the capacitor core 240 and the insulating sleeve 210. Through its own insulation performance and electric field equalization effect, it prevents partial discharge and insulation breakdown, ensuring the safe and stable transmission of high-voltage current.

[0033] However, due to structural layout and the inherent properties of the insulating medium, the flow of the insulating medium between the insulating sleeve 210 and the capacitor core 240 is extremely weak natural convection, with the flow velocity consistently maintained at a very low level. When the insulating medium comes into contact with the inner wall of the insulating sleeve 210, a relatively thick thermal boundary layer forms on the inner wall surface of the insulating sleeve 210 under its own viscous force, especially in the heat-generating core area at the top of the insulating sleeve 210. This thermal boundary layer significantly hinders heat conduction, weakens the heat dissipation capacity of the insulating medium, and easily leads to localized heat accumulation, affecting the overall insulation performance and operational stability of the high-voltage bushing.

[0034] Based on this, the high-voltage sleeve also includes a flow component, which is used to drive the insulating medium to circulate between the capacitor core 240 and the insulating sleeve 210, thereby enhancing the heat exchange efficiency of the insulating medium and eliminating the thick thermal boundary layer on the inner wall of the insulating sleeve 210.

[0035] Specifically, the flow components include an isolation cylinder 310 and a drive unit.

[0036] The isolation cylinder 310 has a cylindrical structure and is coaxially sleeved on the outside of the capacitor core 240, located between the capacitor core 240 and the insulating sleeve 210.

[0037] Multiple elastic support members 311 are uniformly fixedly arranged circumferentially on the inner wall of the isolation cylinder 310. Each elastic support member 311 is a slender plate-like structure extending axially along the insulating sleeve 210, with its end fixedly connected to the isolation cylinder 310. The elastic support member 311 has an opening facing outward, and its two side walls are parallel to each other, forming a preset angle with the inner wall of the isolation cylinder 310. The outer wall of the elastic support member 311 is in direct contact with the outer wall of the capacitor core 240. The multiple elastic support members 311 provide a uniform radial support force to the capacitor core 240, thereby achieving stable positioning of the capacitor core 240 and forming an annular flow gap between the capacitor core 240 and the insulating sleeve 210. The insulating medium can flow through the inner wall area of ​​each elastic support member 311 and the flow gap between adjacent elastic support members 311.

[0038] The insulating sleeve 210 is provided with a partition structure for dividing the flow gap into two independent flow channels. The partition structure includes two partition plates 215 and two partition strips 216.

[0039] The two isolation plates 215 are symmetrically distributed about the axis of the insulating sleeve 210. Each isolation plate 215 is fixedly connected to the upper end of the conductive rod 230 and is situated in the cavity between the oil conservator 250 and the capacitor core 240. The two isolation plates 215 are on the same radial plane, uniformly dividing the cavity between the oil conservator 250 and the capacitor core 240 into two independent dielectric transition regions.

[0040] The isolation strip 216 is a long, plate-like structure. One end of one side wall of each isolation strip 216 is fixedly connected to an isolation plate 215, and the other side wall is fixedly connected to the inner wall of the insulating sleeve 210. The isolation strip 216 extends downwards along the axial direction of the insulating sleeve 210 until it reaches the lower end of the upper insulating section 211. The isolation strip 216 serves to separate the annular flow gap between the inner wall of the insulating sleeve 210 and the outer wall of the capacitor core 240, allowing the insulating medium to flow between the bottoms of the two channels.

[0041] The two isolation plates 215 and the two isolation strips 216 together form a continuous separation interface, dividing the original annular flow gap into two independent flow channels in the circumferential direction.

[0042] The drive unit includes two independent power units, each of which is disposed within a flow channel. Each power unit includes a piston plate 320, a telescopic component 330, and a power source.

[0043] The piston plate 320 is a plate-shaped sealing structure. Two piston plates 320 are located on opposite sides of the radial plane containing the two isolation plates 215, within a separated flow channel. The piston plate 320 is positioned at the upper end of the isolation cylinder 310, its inner wall fitting against the outer wall of the conductive rod 230, and its outer wall fitting against the inner wall of the isolation cylinder 310, achieving a sliding connection with the conductive rod 230 and the isolation cylinder 310. Each piston plate 320 has multiple flow holes penetrating its body, and each flow hole is equipped with a one-way valve 321. The one-way valves 321 on the two piston plates 320 have completely opposite conduction directions, and the one-way valves 321 remain open under normal pressure.

[0044] The telescopic component 330 is a closed corrugated tubular structure with an independent air chamber inside. The lower end of the telescopic component 330 is sealed and fixedly connected to the piston plate 320. A sliding outer cylinder 331 and a sliding inner cylinder 332 are coaxially arranged inside the telescopic component 330. The sliding outer cylinder 331 is fixedly connected to the upper end of the telescopic component 330, and the sliding inner cylinder 332 is fixedly connected to the lower end of the telescopic component 330. The sliding outer cylinder 331 is coaxially slidably sleeved on the outside of the sliding inner cylinder 332. The sliding outer cylinder 331 and the sliding inner cylinder 332 are used to limit the deviation of the telescopic component 330 during its movement, ensuring that the telescopic component 330's extension and retraction action is always axial. Vent holes 333 are provided on the walls of both the sliding outer cylinder 331 and the sliding inner cylinder 332, allowing communication between the interior of the sliding outer cylinder 331 or the sliding inner cylinder 332 and the interior of the telescopic component 330, ensuring pressure balance inside the telescopic component 330.

[0045] The power source includes an air pump (not shown in the figure) and a connecting pipe 340. The air pump is a controllable air pressure output device, capable of quantitatively pumping in and extracting gas. The connecting pipe 340 passes through the upper end of the oil tank 250, connecting the air pump and the sliding outer cylinder 331 inside the air chamber of the telescopic component 330. The air pump transmits gas through the connecting pipe 340, driving the sliding outer cylinder 331 and the sliding inner cylinder 332 to generate relative motion, which in turn drives the telescopic component 330 to complete the telescopic action, thereby driving the piston plate 320 to reciprocate axially.

[0046] When the high-pressure bushing is working normally, the two air pump devices work alternately, pumping gas into and out of the corresponding telescopic parts 330 respectively, driving the two piston plates 320 to move axially in opposite directions.

[0047] by Figure 6 Taking the shown perspective as an example, when the left piston plate 320 moves towards the capacitor core 240, the pressure of the insulating medium acts on the closing surface of the one-way valve 321, causing the one-way valve 321 on the left piston plate 320 to completely close. The left piston plate 320 pushes the insulating medium to move directionally towards the lower end of the insulating sleeve 210 in the left flow channel through the sealing surface. The insulating medium completes the reversal at the flow channel corner at the lower end of the insulating sleeve 210 and enters the right flow channel. When the left piston plate 320 moves away from the capacitor core 240, the pressure of the insulating medium acts on the opening surface of the one-way valve 321, and the one-way valve 321 returns to the open state. The insulating medium in the oil conservator 250 enters the left flow channel through the flow hole on the left piston plate 320.

[0048] Simultaneously, the piston plate 320 in the right flow channel moves in the opposite phase. When the right piston plate 320 moves away from the capacitor core 240, the one-way valve 321 closes synchronously. The axial movement of the piston plate 320 increases the volume of the flow channel space between the right piston plate 320 and the capacitor core 240, creating a negative pressure environment. This pushes the insulating medium in the right flow channel towards the oil conservator 250. When the right piston plate 320 moves towards the capacitor core 240, the one-way valve 321 above it opens, and the insulating medium entering the right flow channel flows out of the right flow channel through the flow hole on the right piston plate 320 and enters the oil conservator 250.

[0049] Thus, through the alternating drive of the two piston plates 320, the insulating medium achieves continuous circulation between the two flow channels and the oil conservator 250, significantly increasing the flow rate of the insulating medium, effectively eliminating the thermal boundary layer on the inner wall surface of the insulating sleeve 210, avoiding local heat accumulation, and enhancing heat dissipation efficiency. Simultaneously, the axial circulation of the insulating medium ensures a uniform temperature distribution of the insulating medium along the axial direction of the insulating sleeve 210, eliminating the axial temperature gradient of the capacitor core 240, preventing varying degrees of thermal deformation of the capacitor core 240 due to axial temperature differences, and ensuring the structural integrity and operational stability of the capacitor core 240.

[0050] Specifically, the elastic support 311 and the insulating strip 216 between the capacitor core 240 and the insulating sleeve 210 are both made of highly elastic materials. During operation, the capacitor core 240 will accumulate heat due to energy loss, which will lead to radial expansion deformation. When the capacitor core 240 undergoes radial expansion, the elastic support 311 and the insulating strip 216 can simultaneously undergo adaptive elastic deformation, actively reducing the radial constraint force on the capacitor core 240, effectively absorbing the expansion of the capacitor core 240, and fully releasing the thermal stress of the capacitor core 240. This fundamentally avoids the compression damage to the capacitor core 240 caused by thermal expansion, ensuring the long-term stable operation of the capacitor core 240.

[0051] In one embodiment, the power unit further includes a compensation component for compensating for volume changes in the insulating medium caused by temperature variations.

[0052] Specifically, the compensation component includes a mounting base 350 and two compensation pipes 351. The mounting base 350 is a cylindrical structure with the opening facing upward. The mounting base 350 is fixedly placed inside the oil tank 250 and has a through hole at the bottom. The through hole communicates with the inner cavity of the oil tank 250, allowing the insulating medium to flow freely into or out of the mounting base 350.

[0053] The compensating tube 351 has a corrugated tubular structure, capable of expanding and contracting along its own axis, and can absorb or release pressure generated by changes in the volume of the insulating medium through deformation. Two compensating tubes 351 are arranged symmetrically about the axis of the mounting base 350 and are fixedly mounted on it. The lower wall of each compensating tube 351 is fixedly connected to the upper wall of a telescopic member 330. Each compensating tube 351 is fixedly sleeved on the outside of a connecting tube 340. The portion of the connecting tube 340 located inside the compensating tube 351 has a reserved redundant length, ensuring that when the compensating tube 351 is stretched to its maximum permissible length by external force, the internal connecting tube 340 remains relaxed, thereby avoiding any tension or constraint on the free deformation of the compensating tube 351.

[0054] When the ambient temperature or equipment operating temperature changes, the insulating medium will experience simultaneous changes in volume and pressure due to thermal expansion and contraction. When the insulating medium increases in volume due to temperature rise, it will compress and deform the compensation tube 351 to accommodate the increased volume, thereby suppressing abnormal increases in system pressure. When the insulating medium decreases in volume due to temperature drop, the compensation tube 351 will extend under its own elasticity or the action of external pressure difference to fill the volume gap, maintain stable internal system pressure, avoid flow channel pressure fluctuations caused by changes in the volume of the insulating medium, and ensure stable operation of the flow components.

[0055] Furthermore, when the ambient temperature or equipment operating temperature changes drastically, the change in the volume of the insulating medium may cause the deformation of the compensation tube 351 to exceed its stable operating range of linear elastic deformation, entering the nonlinear deformation stage. The compensation tube 351 in the nonlinear segment will be subjected to a sharp increase in mechanical stress, significantly increasing the risk of fatigue damage to its material and drastically shortening its service life.

[0056] Based on this, the two air pump devices can operate synchronously, that is, simultaneously pump gas into or extract gas from the two telescopic components 330, thereby adjusting the total volume of the two telescopic components 330 in the insulating medium.

[0057] When the insulating medium expands due to increased temperature, two air pumps simultaneously extract gas from the two expansion joints 330, driving the two expansion joints 330 to contract axially, reducing the total volume of the expansion joints 330 in the insulating medium, reserving sufficient space for the expanding insulating medium, and reducing the expansion pressure of the insulating medium on the compensation pipe 351; when the insulating medium shrinks due to decreased temperature, two air pumps simultaneously pump gas into the two expansion joints 330, driving the two expansion joints 330 to stretch axially, increasing the total volume of the expansion joints 330 in the insulating medium, filling the space gap formed by the contraction of the insulating medium, and increasing the pressure of the insulating medium on the compensation pipe 351.

[0058] Therefore, by using the above-mentioned control methods, the range of changes in the volume of the insulating medium that the compensation tube 351 can compensate for can be greatly increased, ensuring that the compensation tube 351 always undergoes elastic deformation within the stable operating range, and avoiding stress damage caused by entering the nonlinear deformation range.

[0059] Understandably, after the two air pump devices complete the above adjustment operations, they immediately resume the alternating working mode, pumping gas into and extracting gas into the corresponding telescopic parts 330 respectively, driving the two piston plates 320 to move axially in opposite directions, ensuring the continuous forced circulation of the insulating medium.

[0060] In one embodiment, the flow assembly further includes a cleaning unit, which is used to continuously scrape and clean the inner wall of the insulating sleeve 210 during the circulation of the insulating medium, so as to prevent impurities or aged and deteriorated layers in the insulating medium from adhering and forming thermal resistance, and to ensure the heat exchange efficiency and insulation performance of the inner wall of the insulating sleeve 210.

[0061] Specifically, the inner wall of the insulating sleeve 210 is provided with a rotating groove with its opening facing its own axis along the circumferential direction, and the outer wall of the isolation cylinder 310 is provided with at least two limiting protrusions distributed along the circumferential direction. The limiting protrusions can be embedded in the rotating groove so that the isolation cylinder 310 can rotate relative to the insulating sleeve 210.

[0062] The cleaning unit includes multiple scrapers 312 and a rotating structure.

[0063] The scraper 312 is an elongated strip extending along the axial direction of the insulating sleeve 210. Multiple scrapers 312 are evenly spaced along the circumference of the insulating sleeve 310, and each scraper 312 is fixedly connected to the insulating sleeve 310. The outer wall of the scraper 312 is provided with a wear-resistant coating and maintains contact with the inner wall of the insulating sleeve 210.

[0064] The rotating structure includes multiple guide blocks 322 and multiple helical grooves 313. The guide blocks 322 are circumferentially spaced and fixedly mounted on the outer peripheral wall of one of the piston plates 320. An annular sleeve is coaxially fixed to the inner wall of the insulating sleeve 310, with its inner diameter matching the outer diameter of the piston plate 320 to ensure axial sliding of the piston plate 320 within the annular sleeve. The helical grooves 313 are located on the inner wall of the annular sleeve, their extension direction inclined relative to the axis of the insulating sleeve 210. The guide blocks 322 and helical grooves 313 slide in cooperation. When the piston plate 320 reciprocates axially, the guide blocks 322 slide along the inclined trajectory of the helical grooves 313, driving the annular sleeve to rotate around the axis of the insulating sleeve 210 through helical transmission, thereby causing the insulating sleeve 310 to rotate circumferentially. The isolation strip 216 is provided with a corresponding clearance groove. The annular sleeve can pass through the clearance groove in the circumferential direction to form a structural clearance fit, so as to avoid the isolation strip 216 from interfering with or hindering the circumferential rotation of the isolation cylinder 310.

[0065] When the isolation cylinder 310 rotates, it synchronously drives multiple scrapers 312 to rotate around the axis of the insulating sleeve 210, so that the scrapers 312 continuously scrape the inner wall of the insulating sleeve 210 in the whole circumference, promptly removing impurities or deposits attached to the inner wall of the insulating sleeve 210, preventing them from forming an adhesion layer that hinders heat conduction and the flow of insulating medium, ensuring smooth circulation of insulating medium, and maintaining heat exchange efficiency.

[0066] Understandably, the isolation cylinder 310 is provided with multiple annular reinforcing ribs spaced along its axial direction to circumferentially fix multiple elastic support members 311 and multiple scrapers 312, providing a stable mounting base and radial support for the elastic support members 311 and scrapers 312, ensuring the positional stability and structural reliability of the multiple elastic support members 311 and multiple scrapers 312 when bearing the expansion reaction force of the capacitor core 240 or performing scraping operations.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An outdoor immersion environmentally friendly gas-fired power transformer, characterized in that, The device includes a high-voltage bushing, which comprises an insulating sleeve, a capacitor core, and a flow assembly. The capacitor core is disposed inside the insulating sleeve and is coaxially arranged with the insulating sleeve. An insulating medium is filled between the capacitor core and the insulating sleeve. The flow assembly is used to drive the insulating medium to circulate between the capacitor core and the insulating sleeve. The flow assembly includes an isolation cylinder and a driving component. The isolation cylinder is sleeved outside the capacitor core and abuts against the inner wall of the insulating sleeve. The isolation cylinder is used to form an annular flow gap between the capacitor core and the insulating sleeve. The driving component is used to drive the insulating medium to circulate along the axial direction of the insulating sleeve within the flow gap. Multiple elastic support members are provided between the insulating sleeve and the capacitor core. The multiple elastic support members are distributed circumferentially and are fixedly connected to the insulating sleeve. The elastic support members are used to provide elastic buffer when the capacitor core is heated and expanded.

2. The outdoor immersed environmentally friendly gas power transformer according to claim 1, characterized in that, The insulating sleeve is provided with a partition structure, which is used to divide the flow gap into two circumferentially distributed flow channels; The driving component includes two power units, each power unit being configured corresponding to one of the flow channels, and the two power units being used to drive the insulating medium to flow in opposite directions within the two flow channels.

3. The outdoor immersion environmentally friendly gas power transformer according to claim 2, characterized in that, The power unit includes a piston plate, a telescopic component, and a power source; each piston plate is slidably disposed within a flow channel; the first end of the telescopic component is connected to the piston plate; the power source is connected to the second end of the telescopic component via a connecting pipe, and the power source is used to drive the piston plate to reciprocate along the axial direction of the insulating sleeve. The piston plate is provided with a one-way valve, and the one-way valves on the piston plates in the two flow channels have opposite conduction directions.

4. The outdoor immersion environmentally friendly gas power transformer according to claim 3, characterized in that, The power unit also includes a compensation component, which is used to compensate for the volume change of the insulating medium caused by temperature changes.

5. The outdoor immersed environmentally friendly gas power transformer according to claim 4, characterized in that, The compensation component includes a compensation tube that can expand and contract along its own axis. The compensation tube is coaxially sleeved on the outside of the connecting tube. The portion of the connecting tube inside the compensation tube has a reserved length so that the connecting tube remains in a relaxed state when the compensation tube is stretched to its maximum length.

6. The outdoor immersion environmentally friendly gas power transformer according to claim 3, characterized in that, The flow assembly further includes a cleaning unit, which is used to clean the inner wall of the insulating sleeve when the insulating medium is circulating.

7. The outdoor immersed environmentally friendly gas power transformer according to claim 6, characterized in that, The cleaning unit includes multiple scrapers and a rotating structure. The multiple scrapers are spaced apart circumferentially, and each scraper is fixedly connected to the isolation cylinder. The sidewall of the scraper contacts the inner wall of the insulating sleeve. The rotating structure is used to drive the scraper to rotate relative to the insulating sleeve during the circulation of the insulating medium.

8. The outdoor immersion environmentally friendly gas power transformer according to claim 7, characterized in that, The rotating structure includes a guide block and a spiral groove. The guide block is disposed on the piston plate. The spiral groove is disposed on the inner wall of the isolation cylinder. The guide block and the spiral groove are slidably engaged to drive the isolation cylinder to rotate around the axis of the insulating sleeve when the piston plate moves axially.

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