High-ignition-point oil-immersed transformer

Abstract

The invention relates to the technical field of transformers, and discloses a high-ignition-point oil-immersed transformer which comprises a transformer shell, hollow fins are fixed to the front side and the rear side of the transformer shell in an array mode, a lining partition plate is fixedly installed in the transformer shell, and a U-shaped flow channel is defined between the lining partition plate and the side walls of the hollow fins. A central flow channel is formed in the lining partition plate and is communicated with the U-shaped flow channel; the bottom of the right end of the transformer shell is connected with an oil pump, and a flow guide pipe is connected between the output end of the oil pump and the right end of the transformer shell. Transformer oil firstly enters the right half parts of the hollow fins under the diversion action of the spacing plates, then is converged into the U-shaped runners from the left half parts of the hollow fins, and finally flows into the central runner from the linear nozzles; transformer oil in the central flow channel flows from left to right to cool an iron core, a winding and the like; therefore, the contact area between the transformer oil and the hollow fins is large, and the heat dissipation effect of the hollow fins is enhanced.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a high ignition point oil-immersed transformer. Background Technology

[0002] An oil-immersed transformer is a type of electrical equipment that uses insulating oil as the primary insulating and cooling medium. It mainly consists of a core, windings, oil tank, oil conservator, radiator, insulating bushings, and gas relays. Transformer oil not only provides excellent electrical insulation properties but also removes heat generated during operation through natural convection or forced circulation, effectively preventing overheating.

[0003] Chinese patent CN120637019B, filed on June 27, 2025, discloses an oil-immersed transformer, including an oil tank, an oil conservator located above the oil tank, a pressure balancing system, and a cooling system. The cooling system includes a heat dissipation plate assembly, two positioning tubes, a first connecting tube, and a second connecting tube. The inner space of the oil conservator and the inner channels of the two positioning tubes are connected through the first and second connecting tubes. The heat dissipation plate assembly includes a first heat dissipation seat, a second heat dissipation seat, two guide rods, and several sealing rings. The second heat dissipation seat slides on the first heat dissipation seat. The guide rods are installed on the second heat dissipation seat and inserted into the positioning tubes. The sealing rings are installed on the guide rods and sandwiched between the guide rods and the positioning tubes. The guide rods can be moved and adjusted on the positioning tubes. During operation, the pressure balancing system adjusts its state according to the liquid level in the oil conservator, thereby using the air pressure in the oil conservator to adjust the position of the second heat dissipation seat. This invention effectively extends the transformer's lifespan, has strong practicality, and has significant potential for widespread application.

[0004] In this technical solution, heat dissipation is achieved by setting up a first heat sink and a second heat sink. The heat dissipation efficiency is adjusted by moving the second heat sink relative to the first heat sink. However, the contact area between the transformer oil and the first and second heat sinks is limited, resulting in relatively low heat dissipation efficiency for the transformer, which warrants further improvement. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a high-ignition-point oil-immersed transformer, which has the advantages of a large contact area between transformer oil and heat sink, resulting in high heat dissipation efficiency, thus solving the problem of limited contact area between transformer oil and heat sink and insufficient heat dissipation efficiency.

[0006] (II) Technical Solution To achieve the aforementioned goal of large contact area between transformer oil and heat sink, resulting in high heat dissipation efficiency, this invention provides the following technical solution: A high flash point oil-immersed transformer includes a transformer housing. Hollow fins are fixedly arranged in an array on both the front and rear sides of the transformer housing. An inner lining partition is fixedly installed inside the transformer housing. A U-shaped flow channel is formed between the inner lining partition and the sidewall of the hollow fins. The two openings of the U-shaped flow channel are arranged opposite to each other. A central flow channel is formed inside the inner lining partition and communicates with the U-shaped flow channel. An oil pump is connected to the bottom right end of the transformer housing. A guide pipe is connected between the output end of the oil pump and the right end of the transformer housing. The input end of the oil pump communicates with the central flow channel. The guide pipe communicates with the middle right side of the U-shaped flow channel. A filter assembly and a sealing valve assembly are arranged on the guide pipe. The sealing valve assembly is located above the filter assembly. An oil conservator assembly is arranged above the right end of the transformer housing and communicates with the sealing valve assembly. An air jet assembly is arranged at the bottom of the hollow fins.

[0007] Preferably, the inner lining baffle includes a U-shaped cover fixedly installed on the inner wall of the transformer housing, with straight nozzles fixedly installed at both ends of the U-shaped cover; spacers are welded in an array on both the front and rear sides of the U-shaped cover, with each spacer corresponding to a hollow fin, and the spacer is inserted into the middle of the hollow fin, with a gap reserved between the end of the spacer and the inner wall of the hollow fin; a diverter plate is fixedly installed in the middle of the right side of the U-shaped cover.

[0008] Preferably, the guide pipe includes a horizontal pipe and a vertical pipe; the filter assembly includes a slag storage cylinder, one end of the horizontal pipe is connected to the output end of the oil pump, and the other end of the horizontal pipe is connected to the top of the slag storage cylinder along the tangent direction of the circumference of the slag storage cylinder; the bottom end of the vertical pipe is fixed through and fixed at the center of the top of the slag storage cylinder, and the top end of the vertical pipe is connected to the center of the right end of the transformer housing, and the diverter plate equally divides the opening at the top of the vertical pipe into two parts; a spiral plate is fixedly installed between the inner wall of the slag storage cylinder and the outer wall of the vertical pipe, a sealing column is inserted into the bottom end of the slag storage cylinder, and a sealing ring is provided between the inner wall of the bottom end of the slag storage cylinder and the circumferential surface of the sealing column.

[0009] Preferably, the upper half of the sealing column is hollow, and the upper half of the sealing column is provided with an array of filter holes; a support is fixedly installed on the outer wall of the lower half of the slag storage cylinder, a sliding frame is fixedly installed at the bottom of the sealing column, the sliding frame is slidably connected to the support, and a tension spring is fixedly installed between the top of the sliding frame and the sealing valve assembly.

[0010] Preferably, the sealing valve assembly includes a tubular valve housing fixedly mounted on a vertical pipe, the tubular valve housing being perpendicular to the vertical pipe and dividing the vertical pipe into upper and lower parts; a cylindrical valve core is slidably connected inside the tubular valve housing, a through hole is formed on the circumferential surface of the cylindrical valve core, the inner diameter of the through hole is equal to the inner diameter of the vertical pipe, the through hole communicates with the upper and lower parts of the vertical pipe, an arc-shaped plate is fixedly mounted on the upper half of the rear end of the cylindrical valve core, the rear end of the arc-shaped plate is attached to the inner wall of the rear end of the tubular valve housing, a spring is fixedly mounted between the front end of the cylindrical valve core and the inner wall of the tubular valve housing; an oil drain pipe is connected between the rear end of the tubular valve housing and the oil conservator assembly.

[0011] Preferably, the oil conservator assembly includes an oil conservator body fixedly installed on the upper right side of the transformer housing, the bottom of the oil conservator body being connected to the transformer housing via an oil replenishment pipe; a fixed cylinder is fixedly installed on the top of the oil conservator body, an exhaust pipe is connected to the center of the top of the fixed cylinder, an air filter is connected to the bottom of the exhaust pipe, the top of the oil drain pipe is connected to the circumferential surface of the fixed cylinder, and a pressure valve is provided inside the fixed cylinder.

[0012] Preferably, the pressure valve includes two fixed pipes fixedly installed on the top of the oil conservator body, the two fixed pipes being located on the front and rear sides of the fixed cylinder respectively; a floating piston is slidably connected inside the bottom end of the fixed pipe, and a spring is fixedly installed between the top of the floating piston and the inner top wall of the fixed pipe; a horizontal plate is fixedly installed between the bottom ends of the two floating pistons, and a sealing plug is fixedly installed on the top of the horizontal plate, the sealing plug being arranged along the axial direction of the fixed cylinder, and the upper half diameter of the sealing plug being equal to the inner diameter of the exhaust pipe; a perforated plate is fixedly installed on the circumferential surface of the sealing plug, and a shielding ring is fixedly installed on the sealing plug through the perforated plate, the shielding ring fitting against the inner wall of the fixed cylinder, and the shielding ring sealing the top end of the oil drain pipe.

[0013] Preferably, the jet assembly includes two piston cylinders fixedly installed on the left end of the transformer housing. The two piston cylinders are distributed front to back and their openings are opposite to each other. A transverse piston is slidably connected inside the opening of each of the two piston cylinders, and a reciprocating pushing member is provided between the two transverse pistons. An air inlet pipe and an air outlet pipe are connected to opposite ends of each of the two piston cylinders. A one-way valve is provided on the air inlet pipe, and a one-way valve is provided on the air outlet pipe. The jet assembly also includes a U-shaped tube fixedly installed at the bottom of the hollow fins. The two ends of the U-shaped tube are sealed, and jet holes are equidistantly opened on the front and rear halves of the U-shaped tube. Each jet hole is located between two adjacent hollow fins.

[0014] Preferably, the reciprocating pusher includes a turntable rotatably connected to the left end of the transformer housing, a pusher fixedly installed at the eccentric position on the left side of the turntable, a frame-shaped slide block slidably connected to the left side of the transformer housing along the front-back direction, the pusher slidably connected inside the frame-shaped slide block, two transverse pistons fixedly installed at opposite ends on the front and rear sides of the frame-shaped slide block, and a rotation drive component provided at the center of the turntable.

[0015] Preferably, the rotating drive component includes an annular cover fixedly installed on the inner wall of the left end of the transformer housing, and a conical ring is provided at the center of the right side of the annular cover; an impeller is rotatably connected inside the annular cover, and the center of the impeller is coaxially fixed with the center of the turntable; the annular cover is located between two straight nozzles, and two oil inlet arc grooves are arrayed on the circumferential surface of the annular cover, one of which is located on the upper front side of the annular cover and the other is located on the lower rear side of the annular cover; two flow guide plates are arrayed and fixed on the circumferential surface of the annular cover, and the two flow guide plates are respectively located at the top and bottom of the annular cover.

[0016] (III) Beneficial Effects Compared with the prior art, the present invention provides a high ignition point oil-immersed transformer, which has the following beneficial effects: 1. This high-flash-point oil-immersed transformer uses an oil pump to draw transformer oil from the central flow channel, then transports it through a horizontal pipe to the slag storage cylinder. The transformer oil flows along a spiral flow channel, causing solid particles inside the oil to settle at the bottom of the slag storage cylinder under centrifugal force. Afterward, the transformer oil is filtered through filter holes and enters the vertical pipe, then the U-shaped flow channel. A flow divider separates the transformer oil sprayed from the vertical pipe, directing it to either end of the U-shaped flow channel. Under the guidance of the partition plate, the transformer oil first enters the right half of the hollow fins, then flows from the left half of the hollow fins into the U-shaped flow channel, and finally flows into the central flow channel from a straight nozzle. The oil pump draws transformer oil from the right end of the central flow channel, causing the oil to flow from left to right, cooling the core and windings. This achieves a large contact area between the transformer oil and the hollow fins, enhancing the heat dissipation effect of the hollow fins. 2. In this high-flash-point oil-immersed transformer, when the linear nozzle sprays transformer oil into the annular cover, some of the transformer oil passes through the oil inlet arc groove and enters the annular cover, driving the impeller to rotate, which in turn drives the turntable to rotate, and the push column to make a circular motion, which in turn drives the frame slide to move back and forth in the front and back direction, so that the two piston cylinders alternately spray air into the U-shaped tube, and the air jet hole sprays air between the hollow fins, which enhances the air flow around the hollow fins and enhances the heat dissipation effect of the hollow fins; 3. In this high-flash-point oil-immersed transformer, when the temperature of the transformer oil inside the transformer casing and oil conservator is too high, the oil level in the oil conservator rises, causing the floating piston to move upward, which in turn moves the horizontal plate upward. The sealing plug is inserted into the exhaust pipe, sealing the exhaust pipe, and the shielding ring moves away from the drain pipe opening, allowing the transformer oil to pass through the drain pipe and enter the rear half of the tubular valve housing. As the hydraulic pressure in the rear half of the tubular valve housing increases, it causes the cylindrical valve core to move forward, compressing the second spring, and misaligning the through hole with the vertical pipe; and causing the arc-shaped plate to... The upper half of the vertical pipe is sealed, while the lower half is connected to the oil drain pipe. This allows the transformer oil sprayed from the oil drain pipe to backflush the filter holes and enter the slag storage cylinder. In conjunction with the oil pump, transformer oil is fed into the slag storage cylinder, increasing the hydraulic pressure inside. This causes the sealing column to move downwards, separating its bottom from the bottom of the slag storage cylinder. The transformer oil and solid impurities from the bottom of the slag storage cylinder are then ejected from the bottom. This achieves the purpose of automatically draining the transformer oil and removing solid impurities when it overheats. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a high ignition point oil-immersed transformer proposed in this invention; Figure 2 This is a three-dimensional structural diagram of a high ignition point oil-immersed transformer proposed in this invention, viewed from the left side. Figure 3 This is a three-dimensional structural diagram of the transformer shell and hollow fins of a high ignition point oil-immersed transformer proposed in this invention. Figure 4 This is a three-dimensional structural diagram of the inner lining partition of a high ignition point oil-immersed transformer proposed in this invention. Figure 5 This is a top cross-sectional view of the transformer casing and inner lining partition of a high ignition point oil-immersed transformer proposed in this invention. Figure 6 This is a three-dimensional structural diagram of the current guide tube and filter assembly of a high ignition point oil-immersed transformer proposed in this invention. Figure 7 This is a three-dimensional cross-sectional view of the filter assembly of a high ignition point oil-immersed transformer proposed in this invention. Figure 8 This is a three-dimensional exploded view of the filter assembly and sealing valve assembly of a high flash point oil-immersed transformer proposed in this invention. Figure 9 This is a three-dimensional structural diagram of the oil conservator assembly and sealing valve assembly of a high ignition point oil-immersed transformer proposed in this invention. Figure 10 This is a three-dimensional cross-sectional view of the oil conservator assembly of a high ignition point oil-immersed transformer proposed in this invention. Figure 11This is a three-dimensional cross-sectional view of the left end of the transformer casing of a high ignition point oil-immersed transformer proposed in this invention. Figure 12 This is a three-dimensional structural diagram of the jet assembly of a high-ignition-point oil-immersed transformer proposed in this invention.

[0018] In the diagram: 100, transformer housing; 200, hollow fins; 300, inner lining baffle; 400, oil pump; 500, guide pipe; 600, filter assembly; 700, oil conservator assembly; 800, sealing valve assembly; 900, jet assembly; 301. U-shaped shroud; 302. Straight nozzle; 303. Spacing plate; 304. Flow divider; 501. Horizontal pipe; 502. Vertical pipe; 601. Slag storage cylinder; 602. Spiral plate; 603. Sealing column; 604. Filter hole; 605. Sealing ring; 606. Support; 607. Sliding frame; 608. Tension spring; 701. Oil conservator body; 702. Oil replenishment pipe; 703. Fixed cylinder; 704. Exhaust pipe; 705. Air filter; 706. Fixed pipe; 707. Floating piston; 708. Spring 1; 709. Horizontal plate; 710. Sealing plug; 711. Hollowed-out plate; 712. Shielding ring; 801. Tubular valve body; 802. Cylindrical valve core; 803. Through hole; 804. Arc plate; 805. Spring 2; 806. Oil drain pipe; 901. Turntable; 902. Push column; 903. Frame-shaped slide; 904. Piston cylinder; 905. Horizontal piston; 906. Inlet pipe; 907. Outlet pipe; 908. One-way valve one; 909. One-way valve two; 910. U-shaped pipe; 911. Jet nozzle; 912. Annular cover; 913. Conical ring; 914. Impeller; 915. Oil inlet arc groove; 916. Guide plate. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-4A high-ignition-point oil-immersed transformer includes a transformer housing 100. Hollow fins 200 are arrayed and fixed on both the front and rear sides of the transformer housing 100. The hollow fins 200 are hollow, allowing transformer oil to enter the interior of the hollow fins 200. An inner lining partition 300 is fixedly installed inside the transformer housing 100. The main body of the inner lining partition 300 is U-shaped, and a U-shaped flow channel is formed between the inner lining partition 300 and the sidewall of the hollow fins 200. The opening of the U-shaped flow channel is located inside the left end of the transformer housing 100, and the hollow fins 200 communicate with the U-shaped flow channel. The two openings of the U-shaped flow channel are arranged opposite each other, forming a central flow channel inside the inner lining partition 300. The central flow channel communicates with the U-shaped flow channel, and the transformer core and windings are located within the central flow channel.

[0021] An oil pump 400 is connected to the bottom right end of the transformer casing 100. A guide pipe 500 connects the output end of the oil pump 400 to the right end of the transformer casing 100. The input end of the oil pump 400 is connected to the central flow channel, and the guide pipe 500 is connected to the middle right side of the U-shaped flow channel. Through the cooperation of the oil pump 400 and the guide pipe 500, transformer oil is drawn from the right end of the central flow channel and then transported to the right end of the U-shaped flow channel. The transformer oil flows along the U-shaped flow channel and then merges into the central flow channel from the left opening of the U-shaped flow channel. During this process, the transformer oil flows through the hollow fins 200, ensuring full contact between the transformer oil and the hollow fins 200. The hollow fins 200 conduct heat from the transformer oil to the air, improving the heat dissipation efficiency of the hollow fins 200.

[0022] A filter assembly 600 and a sealing valve assembly 800 are installed on the guide pipe 500. The sealing valve assembly 800 is located above the filter assembly 600. An oil conservator assembly 700 is installed above the right end of the transformer housing 100, and the oil conservator assembly 700 is connected to the sealing valve assembly 800. When the transformer oil passes through the filter assembly 600, solid impurities in the transformer oil are removed by the filter assembly 600, preventing fixed impurities from clogging the U-shaped flow channel and the hollow fins 200 (as the transformer is used for a longer period, metal fragments will be generated due to wear). When the temperature of the transformer oil inside the transformer housing 100 and the oil conservator assembly 700 rises, the transformer oil expands. Through the hydraulic action of the transformer oil, the sealing valve assembly 800 is driven to seal the guide pipe 500 and open the bottom end of the filter assembly 600, allowing the transformer oil and fixed impurities in the filter assembly 600 to be discharged, preventing the transformer oil from entering the air filter 705 and affecting the drying effect of the desiccant in the air filter 705.

[0023] A jet assembly 900 is provided at the bottom of the hollow fin 200. When the transformer oil flows from the U-shaped flow channel into the central flow channel, the jet assembly 900 is driven to spray air between the hollow fins 200, which enhances the air flow effect between the hollow fins 200 and further enhances the heat dissipation effect of the hollow fins 200 on the transformer oil.

[0024] Please see Figures 3-5 The inner lining partition 300 includes a U-shaped cover 301 fixedly installed on the inner wall of the transformer housing 100. Straight nozzles 302 are fixedly installed at both ends of the U-shaped cover 301, with the openings of the two straight nozzles 302 facing each other. A U-shaped flow channel is formed between the U-shaped cover 301 and the inner wall of the transformer housing 100. Spare plates 303 are arrayed and welded to both the front and rear sides of the U-shaped cover 301. Each spare plate 303 corresponds to a hollow fin 200, and the spare plate 303 is inserted into the middle of the hollow fin 200. The top and bottom ends of the spare plate 303 are respectively attached to the inner top and bottom walls of the hollow fin 200, with a pre-reserved gap between the end of the spare plate 303 and the inner wall of the hollow fin 200.

[0025] Therefore, when the transformer oil flows within the U-shaped flow channel, it first enters the right half of the hollow fin 200 and then flows into the U-shaped flow channel from the left half of the hollow fin 200. This prolongs the flow distance of the transformer oil inside the hollow fin 200 and extends the contact time between the transformer oil and the hollow fin 200. A diverter plate 304 is fixedly installed in the middle of the right side of the U-shaped cover 301. The diverter plate 304 equally divides the top opening of the guide pipe 500 into two parts. Thus, when the guide pipe 500 delivers transformer oil into the U-shaped flow channel, the diverter plate 304 guides the transformer oil, causing it to flow to the two ends of the U-shaped flow channel.

[0026] Please see Figures 6-8 The guide pipe 500 includes a horizontal pipe 501 and a vertical pipe 502; the filter assembly 600 includes a slag storage cylinder 601. One end of the horizontal pipe 501 is connected to the output end of the oil pump 400, and the other end of the horizontal pipe 501 is connected to the top end of the slag storage cylinder 601 along the tangent direction of the circumference of the slag storage cylinder 601. The bottom end of the vertical pipe 502 is fixed through and fixed at the center of the top end of the slag storage cylinder 601, and the top end of the vertical pipe 502 is connected to the center of the right end of the transformer housing 100. The diverter plate 304 divides the opening at the top end of the vertical pipe 502 into two equal parts. A spiral plate 602 is fixedly installed between the inner wall of the slag storage cylinder 601 and the outer wall of the vertical pipe 502. A sealing column 603 is inserted into the bottom end of the slag storage cylinder 601, and a sealing ring 605 is provided between the inner wall of the bottom end of the slag storage cylinder 601 and the circumferential surface of the sealing column 603.

[0027] The transformer oil in the central flow channel is drawn by the oil pump 400 and transported to the inside of the slag storage cylinder 601. The spiral plate 602 forms a spiral flow channel between the outer wall of the vertical pipe 502 and the inner wall of the slag storage cylinder 601. As the transformer oil flows along the spiral flow channel, the solid particles are gathered at the bottom of the slag storage cylinder 601 under the action of centrifugal force. After that, the transformer oil enters the U-shaped flow channel through the vertical pipe 502.

[0028] The upper half of the sealing column 603 is hollow, and the upper half of the sealing column 603 is arrayed with filter holes 604. The diameter of the bottom end of the sealing column 603 is equal to the inner diameter of the bottom end of the slag storage cylinder 601, and the diameter of the sealing column 603 is smaller than the inner diameter of the bottom end of the slag storage cylinder 601. When the transformer oil inside the slag storage cylinder 601 enters the vertical pipe 502, the solid particles in the transformer oil are intercepted through the filter holes 604, and the transformer oil is further filtered.

[0029] A support 606 is fixedly installed on the lower half of the outer wall of the slag storage cylinder 601. A sliding frame 607 is fixedly installed at the bottom end of the sealing column 603, and the sliding frame 607 is slidably connected to the support 606. A tension spring 608 is fixedly installed between the top end of the sliding frame 607 and the sealing valve assembly 800. The tension of the tension spring 608 causes the sealing column 603 to tend to move upward, thus sealing the bottom end of the slag storage cylinder 601. When the temperature of the transformer oil inside the transformer housing 100 and the oil conservator assembly 700 rises, the sealing valve assembly 800 seals the vertical pipe 502 under hydraulic pressure. In conjunction with the oil pump 400, transformer oil is delivered into the slag storage cylinder 601, increasing the hydraulic pressure inside the slag storage cylinder 601. This causes the sealing column 603 to move downward. After the bottom end of the sealing column 603 separates from the bottom end of the slag storage cylinder 601, an annular gap is formed between the sealing column 603 and the inner wall of the bottom end of the slag storage cylinder 601, allowing transformer oil and solid impurities to pass through and be discharged.

[0030] Please see Figures 7-9 The sealing valve assembly 800 includes a tubular valve housing 801 fixedly mounted on a vertical pipe 502, and a tension spring 608 fixedly mounted on the bottom of the tubular valve housing 801. The tubular valve housing 801 is perpendicular to the vertical pipe 502 and divides the vertical pipe 502 into upper and lower parts. A cylindrical valve core 802 is slidably connected inside the tubular valve housing 801. A through hole 803 is opened through the circumference of the cylindrical valve core 802. The inner diameter of the through hole 803 is equal to the inner diameter of the vertical tube 502. The through hole 803 is connected to the upper and lower parts of the vertical tube 502. An arc plate 804 is fixedly installed on the upper half of the rear end of the cylindrical valve core 802. The rear end of the arc plate 804 is attached to the inner wall of the rear end of the tubular valve housing 801. A spring 805 is fixedly installed between the front end of the cylindrical valve core 802 and the inner wall of the tubular valve housing 801. An oil drain pipe 806 is connected between the rear end of the tubular valve housing 801 and the oil conservator assembly 700.

[0031] The elasticity of spring 805 causes the cylindrical valve core 802 and the arc-shaped plate 804 to tend to move backward. Initially, the arc-shaped plate 804 is attached to the inner wall of the rear end of the tubular valve housing 801, and the through hole 803 is aligned and connected with the vertical pipe 502. As the internal hydraulic pressure of the oil conservator assembly 700 increases, transformer oil enters the rear half of the tubular valve housing 801 through the drain pipe 806, driving the cylindrical valve core 802 to move forward, and the through hole 803 is misaligned with the vertical pipe 502. The arc-shaped plate 804 seals the upper half of the vertical pipe 502, while the lower half of the vertical pipe 502 is connected to the rear half of the tubular valve housing 801. Thus, the transformer oil in the oil conservator assembly 700 can enter the slag storage cylinder 601 through the lower half of the vertical pipe 502. During this process, the transformer oil backflushes the filter hole 604, knocking off the solid impurities stuck in the filter hole 604, causing the fixed impurities to be deposited in the bottom of the slag storage cylinder 601.

[0032] Please see Figures 9-10 The oil conservator assembly 700 includes an oil conservator body 701 fixedly installed above the right end of the transformer housing 100. The bottom of the oil conservator body 701 is connected to the transformer housing 100 through an oil replenishment pipe 702. This keeps the inside of the transformer housing 100 filled with transformer oil. When the transformer oil inside the transformer housing 100 changes volume due to temperature changes, the transformer oil can flow between the transformer housing 100 and the oil conservator body 701 through the oil replenishment pipe 702.

[0033] A fixed cylinder 703 is fixedly installed on the top of the oil conservator body 701. An exhaust pipe 704 is connected to the center of the top of the fixed cylinder 703, and an air filter 705 is connected to the bottom of the exhaust pipe 704. When transformer oil flows between the oil conservator body 701 and the transformer housing 100, outside air flows through the air filter 705 and the exhaust pipe 704. The air is filtered by the air filter 705 to keep the air inside the oil conservator body 701 dry. The top of the oil drain pipe 806 is connected to the circumferential surface of the fixed cylinder 703, and a pressure valve is installed inside the fixed cylinder 703.

[0034] The pressure valve includes two fixed tubes 706 fixedly installed on the top of the oil conservator body 701. The top of the fixed tubes 706 are open, and the two fixed tubes 706 are located on the front and rear sides of the fixed cylinder 703, respectively. A floating piston 707 is slidably connected inside the bottom of the fixed tube 706, and a spring 708 is fixedly installed between the top of the floating piston 707 and the inner top wall of the fixed tube 706.

[0035] A horizontal plate 709 is fixedly installed between the bottom ends of two floating pistons 707. A sealing plug 710 is fixedly installed on the top of the horizontal plate 709. The sealing plug 710 is positioned along the axis of the fixed cylinder 703, and the diameter of the upper half of the sealing plug 710 is equal to the inner diameter of the exhaust pipe 704. A perforated plate 711 is fixedly installed on the circumferential surface of the sealing plug 710. A blocking ring 712 is fixedly installed on the sealing plug 710 through the perforated plate 711. The blocking ring 712 fits against the inner wall of the fixed cylinder 703, sealing the top end of the oil drain pipe 806. In the initial state, the sealing plug 710 is located below the top end of the exhaust pipe 704, and the blocking ring 712 fits against the opening of the oil drain pipe 806. Air inside the oil conservator body 701 flows smoothly through the exhaust pipe 704 and the air filter 705.

[0036] When the temperature of the transformer oil inside the transformer housing 100 and the oil conservator body 701 is too high, the oil level inside the oil conservator body 701 rises, causing the floating piston 707 to move upward. This, in turn, moves the horizontal plate 709 and the sealing plug 710 upward. The sealing plug 710 seals the top of the exhaust pipe 704, and the shielding ring 712 moves away from the top opening of the oil drain pipe 806. The transformer oil inside the oil conservator body 701 passes through the oil drain pipe 806 and enters the tubular valve housing 801. After some of the transformer oil in the transformer housing 100 is discharged from the bottom of the slag storage cylinder 601, the oil level inside the oil conservator body 701 drops. The sealing plug 710 is pulled out from the bottom of the exhaust pipe 704, and the shielding ring 712 seals the top opening of the oil drain pipe 806 again.

[0037] Please see Figures 11-12 The jet assembly 900 includes two piston cylinders 904 fixedly mounted on the left end of the transformer housing 100. The two piston cylinders 904 are arranged front to back with their openings facing each other. A transverse piston 905 is slidably connected inside the opening of each piston cylinder 904, and a reciprocating pusher is disposed between the two transverse pistons 905. An inlet pipe 906 and an outlet pipe 907 are connected to opposite ends of each piston cylinder 904. A one-way valve 908 is installed on the inlet pipe 906, and a two-way valve 909 is installed on the outlet pipe 907. The inlet pipe 906 serves as the input end of the piston cylinder 904 and works in conjunction with the one-way valve 908 to allow external air to enter the piston cylinder 904 through the inlet pipe 906. Similarly, the outlet pipe 907 serves as the output end of the piston cylinder 904 and works in conjunction with the one-way valve 909 to allow air inside the piston cylinder 904 to exit through the outlet pipe 907.

[0038] The jet assembly 900 also includes a U-shaped tube 910 fixedly installed at the bottom of the hollow fins 200. The U-shaped tube 910 is sealed at both ends, and jet holes 911 are equally spaced on both the front and rear halves of the U-shaped tube 910. The jet holes 911 are vertically upward, and each jet hole 911 is located between two adjacent hollow fins 200. Thus, when the transverse piston 905 slides back and forth in the piston cylinder 904, external air enters the piston cylinder 904 through the intake pipe 906. The air in the piston cylinder 904 then enters the U-shaped tube 910 through the exhaust pipe 907. Finally, the air is sprayed between the hollow fins 200 through the jet holes 911, promoting airflow at the hollow fins 200 and further enhancing the heat dissipation effect of the hollow fins 200.

[0039] The reciprocating actuator includes a turntable 901 rotatably connected to the left end of the transformer housing 100. A pusher 902 is fixedly installed at the eccentric position on the left side of the turntable 901. A frame-shaped slide block 903 is slidably connected to the left side of the transformer housing 100 along the front-back direction. The pusher 902 is slidably connected inside the frame-shaped slide block 903. Two transverse pistons 905 are fixedly installed at opposite ends on the front and rear sides of the frame-shaped slide block 903, respectively. A rotational drive is provided at the center of the turntable 901. By rotating the turntable 901, the pusher 902 performs a circular motion, thereby pushing the frame-shaped slide block 903 to reciprocate in the left-right direction. Since the two transverse pistons 905 are respectively connected to the front and rear sides of the frame-shaped slide block 903, and the two transverse pistons 905 move in opposite directions, the two piston cylinders 904 alternately input air into the U-shaped tube 910, and the jet nozzle 911 can continuously inject air into the hollow fin 200.

[0040] The rotating drive component includes an annular cover 912 fixedly installed on the inner wall of the left end of the transformer housing 100, and a conical ring 913 is provided at the center of the right side of the annular cover 912. The opening of the conical ring 913 faces the iron core and coils in the central flow channel. An impeller 914 is rotatably connected inside the annular cover 912, and the center of the impeller 914 is coaxially fixed with the center of the turntable 901.

[0041] An annular cover 912 is located between two straight nozzles 302. Two oil inlet arc grooves 915 are arrayed on the circumference of the annular cover 912. One oil inlet arc groove 915 is located on the upper front side of the annular cover 912, and the other oil inlet arc groove 915 is located on the lower rear side of the annular cover 912. Two guide plates 916 are fixedly arrayed on the circumference of the annular cover 912, located at the top and bottom of the annular cover 912, respectively. Thus, the transformer oil flowing out of the two straight nozzles 302 can pass through the oil inlet arc grooves 915 and enter the interior of the annular cover 912. The guide plates 916 increase the amount of transformer oil entering the annular cover 912. The transformer oil then drives the impeller 914 and the turntable 901 to rotate.

[0042] During use, transformer oil is drawn from the central flow channel by the oil pump 400, and then transported to the inside of the slag storage cylinder 601 through the horizontal pipe 501. The transformer oil flows along the spiral flow channel, causing the solid particles inside the transformer oil to be deposited at the bottom of the slag storage cylinder 601 under the action of centrifugal force. After that, the transformer oil is filtered through the filter hole 604 and enters the vertical pipe 502, and then enters the U-shaped flow channel. The transformer oil sprayed from the vertical pipe 502 is separated by the diverter plate 304, causing the transformer oil to flow to both ends of the U-shaped flow channel. Under the guidance of the partition plate 303, the transformer oil first enters the right half of the hollow fin 200, then flows from the left half of the hollow fin 200 into the U-shaped flow channel, and finally flows into the central flow channel from the straight nozzle 302. The oil pump 400 draws transformer oil from the right end of the central flow channel, causing the transformer oil in the central flow channel to flow from left to right, thus cooling the iron core and windings. When the linear nozzle 302 sprays transformer oil into the annular cover 912, some of the transformer oil passes through the oil inlet arc groove 915 and enters the annular cover 912, driving the impeller 914 to rotate, which in turn drives the turntable 901 to rotate, and the push column 902 to make a circular motion, which in turn drives the frame slide 903 to move back and forth in the front and back direction, so that the two piston cylinders 904 alternately spray air into the U-shaped tube 910, and the air jet hole 911 sprays air between the hollow fins 200, which enhances the air flow around the hollow fins 200 and enhances the heat dissipation effect of the hollow fins 200. When the temperature of the transformer oil inside the transformer housing 100 and the oil conservator body 701 is too high, the level of the transformer oil inside the oil conservator body 701 rises, causing the floating piston 707 to move upward, thereby causing the horizontal plate 709 to move upward. The sealing plug 710 is inserted into the exhaust pipe 704 to seal the exhaust pipe 704, and the shielding ring 712 is removed from the opening of the oil drain pipe 806, allowing the transformer oil to pass through the oil drain pipe 806 and enter the rear half of the tubular valve housing 801. As the hydraulic pressure in the rear half of the tubular valve housing 801 increases, it drives the cylindrical valve core 802 to move forward, compressing the spring 805 and causing the through hole 803 to be misaligned with the vertical pipe 502. This also causes the arc plate 804 to seal the upper half of the vertical pipe 502, while the lower half of the vertical pipe 502 connects to the oil drain pipe 806. As a result, the transformer oil sprayed from the oil drain pipe 806 backflushes the filter hole 604 and enters the slag storage cylinder 601. In conjunction with the oil pump 400, transformer oil is input into the slag storage cylinder 601, increasing the hydraulic pressure inside the slag storage cylinder 601. This causes the sealing column 603 to move downward, separating the bottom end of the sealing column 603 from the bottom end of the slag storage cylinder 601. The transformer oil and solid impurities in the bottom end of the slag storage cylinder 601 are then sprayed out from the bottom end of the slag storage cylinder 601. As transformer oil is ejected, the liquid level inside the oil conservator body 701 decreases. The floating piston 707 moves downward under the elastic action of spring 708, and the shielding ring 712 seals the top of the oil drain pipe 806. The cylindrical valve core 802 resets under the elastic action of spring 805, and the through hole 803 connects with the vertical pipe 502. The sliding frame 607 and the sealing column 603 move upward under the tension of the tension spring 608, and the sealing column 603 seals the bottom of the slag storage cylinder 601 again.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high ignition point oil-immersed transformer, comprising a transformer housing (100), characterized in that: Hollow fins (200) are fixedly arranged on both the front and rear sides of the transformer housing (100). An inner lining partition (300) is fixedly installed inside the transformer housing (100). A U-shaped flow channel is formed between the inner lining partition (300) and the side wall of the hollow fins (200). The two openings of the U-shaped flow channel are arranged opposite to each other. A central flow channel is formed inside the inner lining partition (300), and the central flow channel is connected to the U-shaped flow channel. An oil pump (400) is connected to the bottom right end of the transformer housing (100). A guide pipe (500) is connected between the output end of the oil pump (400) and the right end of the transformer housing (100). The input end of the oil pump (400) is connected to the central flow channel. The guide pipe (500) is connected to the middle right side of the U-shaped flow channel. A filter assembly (600) and a sealing valve assembly (800) are provided on the flow guide pipe (500). The sealing valve assembly (800) is located above the filter assembly (600). An oil conservator assembly (700) is provided above the right end of the transformer housing (100). The oil conservator assembly (700) is connected to the sealing valve assembly (800). The hollow fin (200) is provided with an air jet assembly (900) at its bottom.

2. The high ignition point oil-immersed transformer according to claim 1, characterized in that: The inner lining partition (300) includes a U-shaped cover (301) fixedly installed on the inner side wall of the transformer housing (100), and straight nozzles (302) are fixedly installed at both ends of the U-shaped cover (301). The U-shaped cover (301) has spacer plates (303) welded in an array on both the front and rear sides. The spacer plates (303) correspond one-to-one with the hollow fins (200). The spacer plates (303) are inserted into the middle of the hollow fins (200). A gap is reserved between the end of the spacer plate (303) and the inner wall of the hollow fins (200). A diverter plate (304) is fixedly installed on the middle right side of the U-shaped cover (301).

3. The high ignition point oil-immersed transformer according to claim 2, characterized in that: The guide tube (500) includes a horizontal tube (501) and a vertical tube (502); The filter assembly (600) includes a slag storage cylinder (601), one end of the transverse tube (501) is connected to the output end of the oil pump (400), and the other end of the transverse tube (501) is connected to the top of the slag storage cylinder (601) along the tangential direction of the circumference of the slag storage cylinder (601). The bottom end of the vertical tube (502) is fixed through and fixed at the center of the top end of the slag storage cylinder (601), and the top end of the vertical tube (502) is connected to the center of the right end of the transformer housing (100). The diverter plate (304) divides the opening at the top end of the vertical tube (502) into two equal parts. A spiral plate (602) is fixedly installed between the inner wall of the slag storage cylinder (601) and the outer wall of the vertical pipe (502). A sealing column (603) is inserted into the bottom end of the slag storage cylinder (601). A sealing ring (605) is provided between the inner wall of the bottom end of the slag storage cylinder (601) and the circumferential surface of the sealing column (603).

4. The high ignition point oil-immersed transformer according to claim 3, characterized in that: The upper half of the sealing column (603) is hollow, and the upper half of the sealing column (603) is provided with filter holes (604). A support (606) is fixedly installed on the lower half of the outer wall of the slag storage cylinder (601). A sliding frame (607) is fixedly installed at the bottom of the sealing column (603). The sliding frame (607) is slidably connected to the support (606). A tension spring (608) is fixedly installed between the top of the sliding frame (607) and the sealing valve assembly (800).

5. The high ignition point oil-immersed transformer according to claim 4, characterized in that: The sealing valve assembly (800) includes a tubular valve housing (801) fixedly mounted on a vertical pipe (502), the tubular valve housing (801) being perpendicular to the vertical pipe (502) and dividing the vertical pipe (502) into upper and lower parts; A cylindrical valve core (802) is slidably connected inside the tubular valve housing (801). A through hole (803) is provided on the circumferential surface of the cylindrical valve core (802). The inner diameter of the through hole (803) is equal to the inner diameter of the vertical tube (502). The through hole (803) is connected to the upper and lower parts of the vertical tube (502). An arc plate (804) is fixedly installed on the upper half of the rear end of the cylindrical valve core (802). The rear end of the arc plate (804) is attached to the inner wall of the rear end of the tubular valve housing (801). A spring (805) is fixedly installed between the front end of the cylindrical valve core (802) and the inner wall of the tubular valve housing (801). An oil drain pipe (806) is connected between the rear end of the tubular valve housing (801) and the oil conservator assembly (700).

6. The high ignition point oil-immersed transformer according to claim 5, characterized in that: The oil conservator assembly (700) includes an oil conservator body (701) fixedly installed above the right end of the transformer housing (100), and the bottom of the oil conservator body (701) is connected to the transformer housing (100) through an oil replenishment pipe (702); A fixed cylinder (703) is fixedly installed on the top of the oil conservator body (701). An exhaust pipe (704) is connected to the center of the top of the fixed cylinder (703). An air filter (705) is connected to the bottom of the exhaust pipe (704). The top of the oil drain pipe (806) is connected to the circumferential surface of the fixed cylinder (703). A pressure valve is installed inside the fixed cylinder (703).

7. The high ignition point oil-immersed transformer according to claim 6, characterized in that: The pressure valve includes two fixed pipes (706) fixedly installed on the top of the oil conservator body (701), and the two fixed pipes (706) are respectively located on the front and rear sides of the fixed cylinder (703); A floating piston (707) is slidably connected to the bottom end of the fixed tube (706), and a spring (708) is fixedly installed between the top of the floating piston (707) and the inner top wall of the fixed tube (706). A horizontal plate (709) is fixedly installed between the bottom ends of the two floating pistons (707), and a sealing plug (710) is fixedly installed on the top of the horizontal plate (709). The sealing plug (710) is arranged along the axial direction of the fixed cylinder (703), and the diameter of the upper half of the sealing plug (710) is equal to the inner diameter of the exhaust pipe (704). A perforated plate (711) is fixedly installed on the circumferential surface of the sealing plug (710). A shielding ring (712) is fixedly installed on the sealing plug (710) through the perforated plate (711). The shielding ring (712) is attached to the inner wall of the fixed cylinder (703). The shielding ring (712) seals the top end of the oil drain pipe (806).

8. The high ignition point oil-immersed transformer according to claim 7, characterized in that: The jet assembly (900) includes two piston cylinders (904) fixedly installed on the left end of the transformer housing (100). The two piston cylinders (904) are distributed front to back and their openings are opposite to each other. A transverse piston (905) is slidably connected inside the openings of both piston cylinders (904), and a reciprocating pusher is provided between the two transverse pistons (905); The two piston cylinders (904) are each connected to an air inlet pipe (906) and an air outlet pipe (907) at opposite ends. A one-way valve (908) is provided on the air inlet pipe (906), and a one-way valve (909) is provided on the air outlet pipe (907). The jet assembly (900) also includes a U-shaped tube (910) fixedly installed at the bottom of the hollow fin (200). The two ends of the U-shaped tube (910) are sealed. Jet holes (911) are equally spaced on the front and rear halves of the U-shaped tube (910). Each jet hole (911) is located between two adjacent hollow fins (200).

9. The high ignition point oil-immersed transformer according to claim 8, characterized in that: The reciprocating pusher includes a turntable (901) rotatably connected to the left end of the transformer housing (100). A pusher (902) is fixedly installed at the eccentric position on the left side of the turntable (901). A frame-shaped slide block (903) is slidably connected to the left side of the transformer housing (100) along the front-back direction. The pusher (902) is slidably connected inside the frame-shaped slide block (903). Two transverse pistons (905) are fixedly installed at opposite ends on the front and rear sides of the frame-shaped slide block (903). A rotation drive is provided at the center of the turntable (901).

10. The high ignition point oil-immersed transformer according to claim 9, characterized in that: The rotation drive component includes an annular cover (912) fixedly installed on the inner wall of the left end of the transformer housing (100), and a conical ring (913) is provided at the center of the right side of the annular cover (912). An impeller (914) is rotatably connected inside the annular cover (912), and the center of the impeller (914) is coaxially fixed with the center of the turntable (901); The annular cover (912) is located between two straight nozzles (302). Two oil inlet arc grooves (915) are arrayed on the circumferential surface of the annular cover (912). One of the oil inlet arc grooves (915) is located on the upper front side of the annular cover (912), and the other oil inlet arc groove (915) is located on the lower rear side of the annular cover (912). Two flow guide plates (916) are fixed in an array on the circumferential surface of the annular cover (912). The two flow guide plates (916) are located at the top and bottom of the annular cover (912), respectively.

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