Oil-immersed power transformer

Abstract

The invention discloses an oil-immersed power transformer, and belongs to the technical field of transformers. The oil-immersed power transformer comprises a box body, a transformer main body mounted in the box body, and a high-voltage insulating sleeve and a low-voltage insulating sleeve which are mounted at the top of the box body, and further comprises an oil conservator, the oil conservator is mounted at the top of the box body, an oil inlet pipe is connected between the oil conservator and the box body, and the oil inlet pipe is communicated with the box body and an inner cavity of the oil conservator; the oil conservator is provided with a liquid storage tank installed on the top of the tank body, and the reciprocating type spraying cooling mechanism is installed on the liquid storage tank and used for conducting spraying cooling on the oil conservator. The system is driven by thermal expansion and cold contraction of insulating oil completely, external electric power or a pump machine is not needed, energy is saved, reliability is high, oil temperature changes are directly converted into cooling actions, the response speed is higher, traditional system delay is avoided, mechanical supercharging and sensor control dual mechanisms are adopted, and the basic cooling function can still be maintained when a single system breaks down.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and particularly to oil-immersed power transformers. Background Art

[0002] The oil-immersed transformer is a new type of high-performance transformer with a more reasonable structure and better performance. Its three core columns of the three-dimensional wound core are arranged in an equilateral triangle in three dimensions. There is no air gap in its magnetic circuit, the winding is tighter, the lengths of the three magnetic circuits are the same and the shortest, and the cross-sectional area of the core column is closer to a circle. Therefore, its performance is further improved, the loss is reduced, the noise is reduced, the three-phase balance is achieved, and the third harmonic component is reduced. This product is more suitable for the transformation of urban and rural, industrial and mining enterprise power grids, and is more suitable for transformers used in combined transformers and prefabricated substations.

[0003] Generally, the oil-immersed transformer adopts an external oil-type corrugated oil conservator. The oil outside the corrugated expansion core is directly connected and shared with the insulating oil of the transformer. When the volume of the insulating oil of the transformer expands or decreases with the temperature of the oil, the volume of the corrugated expansion core will shrink or increase under the action of oil pressure, so as to ensure that the transformer oil tank is always full of oil. The oil conservator is generally equipped with a breather, which is used to adjust the air pressure in the oil tank and remove impurities and moisture in the inhaled air. When the transformer expands due to heat, the excess air is discharged through the breather; when the transformer oil temperature drops and contracts, external air is inhaled. During this process, the silica gel in the breather absorbs the moisture in the air to keep the transformer oil dry.

[0004] After retrieval, in the prior art, the Chinese patent with the patent application number 202210139811.4 discloses an "oil-immersed power transformer, including a box body, a transformer body, a cooling component, an exhaust component and a control component; the transformer body is immersed in a containing cavity filled with insulating oil and fixed to the box body. The transformer body includes an iron core and windings wound around the iron core. At least one high-voltage lead wire and at least one low-voltage lead wire are provided on the primary coil and the secondary coil on the windings. The multiple high-voltage lead wires and the multiple low-voltage lead wires are electrically connected to high-voltage insulating bushings and low-voltage insulating bushings respectively. The cooling component is installed in the installation cavity, the exhaust pipe is installed on the upper wall surface of the box body and is provided with an exhaust hole, the plugging member includes a connecting portion and a plugging portion for plugging the exhaust hole, and the spring is sleeved on the connecting portion so that the plugging member is elastically connected to the installation member; the technical solution of the present invention reduces the accumulation of gas generated by the insulating oil by arranging an exhaust pipe on the box body, thereby enhancing the insulation and heat dissipation effects of the insulating oil and reducing the pressure in the containing cavity", but there are still the following defects: (1) The heat sink relies on natural convection or simple forced heat dissipation and cannot effectively cope with the heat accumulation in high-load or high-temperature environments, resulting in an increase in oil temperature and an accelerated aging of the insulation. (2) As a key component for storing oil and regulating pressure, the oil conservator is prone to oil quality deterioration when exposed to high temperatures for a long time, and the traditional design lacks active cooling means. Summary of the Invention

[0005] The object of the present invention is to solve the problems existing in the prior art that conventional heat sinks rely on natural convection or simple forced heat dissipation, and cannot effectively cope with heat accumulation in high-load or high-temperature environments, resulting in increased oil temperature and accelerated insulation aging; as a key component for storing oil and regulating pressure, the oil conservator is prone to oil quality deterioration when exposed to high temperatures for a long time, and the traditional design lacks active cooling means, and to propose a problem of an oil-immersed power transformer.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: An oil-immersed power transformer, including a box body, a transformer main body installed in the box body, and high-voltage insulating bushings and low-voltage insulating bushings installed on the top of the box body, further including: An oil conservator, the oil conservator is installed on the top of the box body, and an oil inlet pipe is connected between the oil conservator and the box body, and the oil inlet pipe communicates with the inner cavity of the box body and the inner cavity of the oil conservator; A reciprocating spraying cooling mechanism, a liquid storage tank is arranged on the oil conservator and installed on the top of the box body, and the reciprocating spraying cooling mechanism is installed on the liquid storage tank for spraying and cooling the oil conservator; Heat sinks, the heat sinks are fixedly installed on the outer side wall of the box body, and the heat sinks adopt a hollow structure, and the inner cavity of the heat sinks communicates with the inner cavity of the box body; A decentralized temperature monitoring mechanism, the decentralized temperature monitoring mechanism is installed between adjacent heat sinks for monitoring the real-time temperature of the heat sinks.

[0007] Preferably, the reciprocating spraying cooling mechanism includes a driving bidirectional threaded screw driven by a servo motor installed between the inner side walls of the liquid storage tank, a threaded seat is threadedly connected to the outer side wall of the driving bidirectional threaded screw, a limiting rod is fixedly connected between the inner side walls of the liquid storage tank, a sliding seat is slidably connected to the outer side wall of the limiting rod, a diaphragm pump is fixedly connected to the top of the threaded seat, a liquid suction pipe placed below the liquid level of the liquid storage tank is connected to the negative pressure end of the diaphragm pump, a spray pipe is fixedly connected between the output end of the diaphragm pump and the sliding seat, and a first atomizing nozzle is uniformly distributed on the side of the spray pipe close to the oil conservator.

[0008] Preferably, the decentralized temperature monitoring mechanism includes a hollow tube installed between adjacent heat sinks. A uniformly distributed first branch pipe perpendicular to the heat sink is connected to the outer side wall of the hollow tube. One end of the first branch pipe away from the hollow tube is connected to a second branch pipe parallel to the heat sink through a right-angle joint. An arc-shaped connecting pipe is connected to one end of the second branch pipe away from the first branch pipe. A third branch pipe parallel to the second branch pipe is fixedly connected to one end of the arc-shaped connecting pipe away from the second branch pipe. Temperature sensors are provided at the junctions of the first branch pipe and the second branch pipe, the second branch pipe and the arc-shaped connecting pipe, and the third branch pipe and the arc-shaped connecting pipe.

[0009] Preferably, the second branch pipe and the third branch pipe are symmetric about the heat sink, and uniformly distributed second atomizing nozzles are provided on the side of the second branch pipe and the third branch pipe facing each other.

[0010] Preferably, a liquid replenishing tank is fixedly connected to the top ends of adjacent heat sinks. A liquid replenishing valve is provided at the top of the liquid replenishing tank. The bottom of the liquid replenishing tank is fixedly connected to the hollow tube, and the inner cavity of the liquid replenishing tank is communicated with the inner cavity of the hollow tube. A one-way valve is provided at the junction of the liquid replenishing tank and the hollow tube. The bottom end of the hollow tube is closed, and an expansion and pressurization assembly is fixedly connected to the outer side wall of the hollow tube.

[0011] Preferably, the expansion and pressurization assembly includes a pressurizing pipe uniformly installed on the outer side wall of the hollow tube. The pressurizing pipe is communicated with the inner cavity of the hollow tube. One end of the pressurizing pipe away from the hollow tube is fixedly connected to a piston cylinder. A piston plate is slidably connected in the piston cylinder. A piston rod is fixedly connected to the outer wall of the piston plate. The piston rod extends out through the piston cylinder. The extended end of the piston rod is connected to a contact wheel. A compression spring is fixedly connected between the piston plate and the inner wall of the piston cylinder.

[0012] Preferably, a mounting seat is provided at the junction of the contact wheel and the piston rod.

[0013] Preferably, a vibration sensor is provided on the mounting seat.

[0014] Preferably, the pipe section of the oil inlet pipe placed in the box body is spiral, and an oil filling port is provided at the top of the box body.

[0015] Preferably, an oil level gauge and a pressure relief valve are further included, and both the oil level gauge and the pressure relief valve are installed on the upper wall surface of the box body.

[0016] Compared with the prior art, the present invention provides an oil-immersed power transformer, which has the following beneficial effects: 1. The oil-immersed power transformer actively cools the oil pillow through a reciprocating spray cooling mechanism, and combines the oil circulation in the hollow heat sink to achieve dual heat dissipation of the box and the oil pillow, significantly reducing the overall oil temperature. This solves the problem in the prior art that the oil pillow, as a key component for storing oil and regulating pressure, is easily exposed to high temperature for a long time, which may lead to oil quality deterioration, and the traditional design lacks active cooling means.

[0017] 2. The oil-immersed power transformer has a distributed temperature monitoring mechanism that covers all areas of the heat sink through multiple pipes and temperature sensors, provides real-time feedback on temperature distribution, and automatically adjusts the coolant flow rate in combination with an expansion booster component to achieve on-demand cooling. This solves the problem in the prior art that conventional heat sinks rely on natural convection or simple forced heat dissipation, and are unable to effectively cope with heat accumulation under high load or high temperature environments, leading to increased oil temperature and accelerated insulation aging.

[0018] 3. The oil-immersed power transformer, the replenishing tank and the one-way valve design ensure the continuous supply of coolant. The expansion booster assembly drives the piston through the principle of thermal expansion and contraction to enhance the coolant injection pressure and adapt to different temperature conditions.

[0019] 4. The hollow structure of the heat sink is connected to the inner cavity of the box to promote oil circulation; the spiral design of the oil inlet pipe extends the oil flow path and improves heat exchange efficiency; the vibration sensor monitors the system operation status to prevent mechanical failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is one of the structural schematic diagrams of the present invention; Figure 2 This is the second structural schematic diagram of the present invention; Figure 3 It is a front view of the present invention; Figure 4 It is a schematic diagram of the connection structure between the heat sink and the distributed temperature monitoring mechanism of the present invention; Figure 5 It is a structural schematic diagram of the distributed temperature monitoring mechanism of the present invention; Figure 6 It is a front view of the distributed temperature monitoring mechanism of the present invention; Figure 7 is a cross-sectional view of the expansion and pressurization assembly of the present invention; Figure 8 This is one of the structural schematic diagrams of the reciprocating spray cooling mechanism of the present invention; Figure 9 This is the second structural schematic diagram of the reciprocating spray cooling mechanism of the present invention.

[0021] In the figure: 10, box body; 110, high-voltage insulating bushing; 120, low-voltage insulating bushing; 20, oil pillow; 210, oil inlet pipe; 30, reciprocating spray cooling mechanism; 310, liquid storage tank; 320, driving bidirectional threaded screw; 330, threaded seat; 340, limit rod; 350, slide seat; 360, diaphragm pump; 370, liquid extraction pipe; 380, spray pipe; 390, first atomizing nozzle; 40, heat sink; 50, distributed temperature monitoring mechanism; 510, medium Empty pipe; 520, first branch pipe; 530, second branch pipe; 540, arc-shaped connecting pipe; 550, third branch pipe; 551, second atomizing nozzle; 560, temperature sensor; 570, liquid replenishing tank; 571, liquid replenishing valve; 580, one-way valve; 590, expansion and pressurizing assembly; 591, pressurizing pipe; 592, piston cylinder; 593, piston plate; 594, piston rod; 595, resistance wheel; 596, compression spring; 597, mounting seat; 598, vibration sensor. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0023] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0024] Example: Reference Figures 1-9 The oil-immersed power transformer comprises a box 10, a transformer body installed in the box 10, and a high-voltage insulating bushing 110 and a low-voltage insulating bushing 120 installed on the top of the box 10, and further comprises: The oil pillow 20 is installed on the top of the box body 10. An oil inlet pipe 210 is connected between the oil pillow 20 and the box body 10. The oil inlet pipe 210 communicates with the box body 10 and the inner cavity of the oil pillow 20; The reciprocating spray cooling mechanism 30, the oil pillow 20 is provided with a liquid storage tank 310 installed on the top of the box body 10, and the reciprocating spray cooling mechanism 30 is installed on the liquid storage tank 310 for spray cooling the oil pillow 20; The heat sink 40 is fixedly installed on the outer side wall of the box body 10. The heat sink 40 has a hollow structure, and the inner cavity of the heat sink 40 is communicated with the inner cavity of the box body 10. The heat sink 40 is communicated with the inner cavity of the transformer box body 10 and is filled with transformer oil. When the transformer load increases, the oil temperature rises, the insulating oil expands due to heat, and the volume increases, resulting in an increase in the oil pressure in the heat sink 40. When the oil temperature decreases, the insulating oil contracts, the volume decreases, and the oil pressure drops. The distributed temperature monitoring mechanism 50 is installed between adjacent heat sinks 40 and is used to monitor the real-time temperature of the heat sinks 40.

[0025] Refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 8 and Figure 9 and Figure 9 , the reciprocating spraying cooling mechanism 30 includes a driving bidirectional threaded screw 320 driven by a servo motor installed between the inner side walls of the liquid storage tank 310. A threaded seat 330 is threadedly connected to the outer side wall of the driving bidirectional threaded screw 320. A limiting rod 340 is also fixedly connected between the inner side walls of the liquid storage tank 310. A sliding seat 350 is slidably connected to the outer side wall of the limiting rod 340. A diaphragm pump 360 is fixedly connected to the top of the threaded seat 330. The negative pressure end of the diaphragm pump 360 is connected to a liquid suction pipe 370 placed below the liquid level of the liquid storage tank 310. A spray pipe 380 is fixedly connected between the output end of the diaphragm pump 360 and the sliding seat 350. A first atomizing nozzle 390 is evenly distributed on the side of the spray pipe 380 close to the oil conservator 20. During the monitoring process, when the temperature sensor 560 and the vibration sensor 598 trigger an early warning, an electric signal is generated and transmitted to the servo motor to control the reciprocating spraying cooling mechanism 30 to accelerate its operation. After receiving the signal, the servo motor drives the driving bidirectional threaded screw 320 to rotate at an accelerated speed, driving the diaphragm pump 360 to reciprocate along the limiting rod 340, expanding the coverage range of the spray pipe 380, and spraying the coolant on the surface of the oil conservator 20 through the first atomizing nozzle 390 to prevent the insulating oil in the oil conservator 20 from overheating; the temperature sensor 560 monitors the temperature of each node of the heat sink 40 in real time, and the vibration sensor 598 detects the movement state of the piston, and the data is fed back to the control system to dynamically optimize the spraying frequency and range.

[0026] Refer to Figures 1-7, the distributed temperature monitoring mechanism 50 includes a hollow tube 510 installed between adjacent heat sinks 40. The outer sidewall of the hollow tube 510 is connected with uniformly distributed first branch tubes 520 perpendicular to the heat sinks 40. One end of the first branch tube 520 away from the hollow tube 510 is connected with a second branch tube 530 parallel to the heat sink 40 through a right-angle joint. One end of the second branch tube 530 away from the first branch tube 520 is connected with an arc-shaped connecting tube 540. One end of the arc-shaped connecting tube 540 away from the second branch tube 530 is fixedly connected with a third branch tube 550 parallel to the second branch tube 530. Temperature sensors 560 are arranged at the joints of the first branch tube 520 and the second branch tube 530, the joint of the second branch tube 530 and the arc-shaped connecting tube 540, and the joint of the third branch tube 550 and the arc-shaped connecting tube 540.

[0027] Refer to Figure 5 , the second branch tube 530 and the third branch tube 550 are symmetrical about the heat sink 40, and uniformly distributed second atomizing nozzles 551 are arranged on the side of the second branch tube 530 and the third branch tube 550 facing each other.

[0028] Refer to Figures 1-5 , the tops of adjacent heat sinks 40 are fixedly connected with a liquid replenishing tank 570. A liquid replenishing valve 571 is arranged at the top of the liquid replenishing tank 570. The bottom of the liquid replenishing tank 570 is fixedly connected with the hollow tube 510, and the inner cavity of the liquid replenishing tank 570 is communicated with the inner cavity of the hollow tube 510. A one-way valve 580 is arranged at the joint of the liquid replenishing tank 570 and the hollow tube 510. The bottom end of the hollow tube 510 is closed, and an expansion and pressurization assembly 590 is fixedly connected to the outer sidewall of the hollow tube 510.

[0029] Refer to Figure 6 and Figure 7, the expansion supercharging assembly 590 includes a supercharging pipe 591 uniformly installed on the outer wall of the hollow pipe 510. The supercharging pipe 591 communicates with the inner cavity of the hollow pipe 510. One end of the supercharging pipe 591 away from the hollow pipe 510 is fixedly connected to a piston cylinder 592. A piston plate 593 is slidably connected in the piston cylinder 592. An outer wall of the piston plate 593 is fixedly connected to a piston rod 594. The piston rod 594 extends outward through the piston cylinder 592. An extension end of the piston rod 594 is connected to a contact wheel 595. A compression spring 596 is fixedly connected between the piston plate 593 and the inner wall of the piston cylinder 592. The high-temperature insulating oil causes the heat sink 40 to expand. The expansion point of the heat sink 40 presses against the contact wheel 595, thereby driving the piston rod 594 to push the piston plate 593 to slide along the piston cylinder 592. At this time, the compression spring 596 is stretched, and then the coolant in the piston cylinder 592 is squeezed through the supercharging pipe 591 into the hollow pipe 510. Then the coolant further passes through the inner cavities of the first branch pipe 520, the second branch pipe 530, and the third branch pipe 550, and then is sprayed onto the surface of the expanded heat sink 40 through the second atomizing nozzle 551 for cooling. After cooling, the temperature of the expansion point of the heat sink 40 decreases and the volume decreases. The compression spring 596 rebounds, and the coolant in the hollow pipe 510 is pumped into the piston cylinder 592 through the piston plate 593. At this time, the pressure in the hollow pipe 510 decreases, and the negative pressure of the hollow pipe 510 supplements the coolant in the hollow pipe 510 from the liquid replenishing tank 570 through the one-way valve 580 to ensure the continuity of the cycle. The thermal expansion and contraction of the insulating oil directly determines the movement amplitude of the piston. The supercharging injection intensity increases at high temperatures and automatically weakens at low temperatures, realizing the self-adaptation of the cooling intensity.

[0030] Refer to Figure 6 and Figure 7 , an installation seat 597 is provided at the junction of the contact wheel 595 and the piston rod 594.

[0031] Refer to Figure 6 and Figure 7 , a vibration sensor 598 is provided on the installation seat 597.

[0032] Refer to Figure 1 , Figure 2 and Figure 3 , the pipe section of the oil inlet pipe 210 placed in the box body 10 is spiral, and an oil filling port is provided at the top of the box body 10.

[0033] Refer to Figure 1 , Figure 2 and Figure 3 , it further includes an oil level gauge and a pressure relief valve, and both the oil level gauge and the pressure relief valve are installed on the upper wall surface of the box body 10.

[0034] The hollow heat sink 40 is connected to the inner cavity of the transformer box 10, and the inner cavity is filled with transformer oil. When the transformer load increases, the oil temperature rises, the insulating oil expands due to the heat, and the volume increases, resulting in an increase in the oil pressure in the heat sink 40. When the oil temperature decreases, the insulating oil contracts, the volume decreases, and the oil pressure decreases. The high-temperature insulating oil causes the heat sink 40 to expand, and the expansion point of the heat sink 40 squeezes the contact wheel 595, thereby driving the piston rod 594 to push the piston plate 593 to slide along the piston cylinder 592. At this time, the compression spring 596 is stretched, and the coolant in the piston cylinder 592 flows through the booster pipe 591 and squeezes into the hollow tube 510. The coolant is then further transmitted to the inner cavity of the first branch pipe 520, the second branch pipe 530 and the third branch pipe 550, and then sprayed to the surface of the expanded heat sink 40 through the second atomizing nozzle 551 to cool down. After cooling, the expansion point temperature of the heat sink 40 decreases, the volume decreases, the compression spring 596 rebounds, and the coolant in the hollow tube 510 is pumped into the piston cylinder 592 through the piston plate 593. At this time, the pressure in the hollow tube 510 decreases, and the negative pressure of the hollow tube 510 replenishes the coolant in the liquid replenishing tank 570 into the hollow tube 510 through the one-way valve 580 to ensure the continuity of the cycle. The thermal expansion and contraction of the insulating oil directly determines the amplitude of the piston movement. The boost injection intensity increases at high temperatures and automatically decreases at low temperatures, thereby achieving adaptive cooling intensity. During the monitoring process, when the temperature sensor 560 and the vibration sensor 598 trigger an early warning, an electrical signal is generated and transmitted to the servo motor to control the reciprocating spray cooling mechanism 30 to accelerate. After receiving the signal, the servo motor drives the bidirectional threaded screw 320 to accelerate rotation, driving the diaphragm pump 360 to move back and forth along the limit rod 340, expanding the coverage of the nozzle 380, and spraying coolant on the surface of the oil pillow 20 through the first atomizing nozzle 390 to prevent the insulating oil in the oil pillow 20 from overheating; the temperature sensor 560 monitors the temperature of each node of the heat sink 40 in real time, and the vibration sensor 598 detects the movement state of the piston. The data is fed back to the control system to dynamically optimize the spraying frequency and range.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oil-immersed power transformer, comprising a box (10), a transformer body installed in the box (10), and a high-voltage insulating bushing (110) and a low-voltage insulating bushing (120) installed on the top of the box (10), characterized in that: Also includes: An oil pillow (20), the oil pillow (20) being mounted on the top of the box (10), an oil inlet pipe (210) being connected between the oil pillow (20) and the box (10), the oil inlet pipe (210) being in communication with the box (10) and the inner cavity of the oil pillow (20); A reciprocating spray cooling mechanism (30), wherein the oil pillow (20) is provided with a liquid storage tank (310) mounted on the top of the box body (10), and the reciprocating spray cooling mechanism (30) is mounted on the liquid storage tank (310) and is used for spray cooling the oil pillow (20); A heat sink (40), the heat sink (40) being fixedly mounted on an outer wall of the box body (10), the heat sink (40) being of a hollow structure, and the inner cavity of the heat sink (40) being in communication with the inner cavity of the box body (10); A distributed temperature monitoring mechanism (50) is installed between adjacent heat sinks (40) and is used to monitor the real-time temperature of the heat sinks (40).

2. The oil-immersed power transformer according to claim 1, characterized in that: The reciprocating spray cooling mechanism (30) comprises a driving bidirectional threaded screw (320) installed between the inner side walls of a liquid storage tank (310) and driven by a servo motor; the outer side wall of the driving bidirectional threaded screw (320) is threadedly connected to a threaded seat (330); a limit rod (340) is also fixedly connected between the inner side walls of the liquid storage tank (310); the outer side wall of the limit rod (340) is slidably connected to a slide seat (350); a diaphragm pump (360) is fixedly connected to the top of the threaded seat (330); a negative pressure end of the diaphragm pump (360) is connected to a liquid extraction pipe (370) disposed below the liquid level of the liquid storage tank (310); a nozzle (380) is fixedly connected between the output end of the diaphragm pump (360) and the slide seat (350); and a first atomizing nozzle (390) is evenly distributed and arranged on a side of the nozzle (380) close to the oil pillow (20).

3. The oil-immersed power transformer according to claim 1, characterized in that: The distributed temperature monitoring mechanism (50) comprises a hollow tube (510) installed between adjacent heat sinks (40); the outer side wall of the hollow tube (510) is connected to a uniformly distributed first branch tube (520) perpendicular to the heat sink (40); one end of the first branch tube (520) away from the hollow tube (510) is connected to a second branch tube (530) parallel to the heat sink (40) via a right-angle joint; the second branch tube (530) is away from the first branch tube (520). One end of the first branch pipe (520) is connected to an arc-shaped connecting pipe (540), one end of the arc-shaped connecting pipe (540) away from the second branch pipe (530) is fixedly connected to a third branch pipe (550) parallel to the second branch pipe (530), and a temperature sensor (560) is provided at the intersection of the first branch pipe (520) and the second branch pipe (530), at the intersection of the second branch pipe (530) and the arc-shaped connecting pipe (540), and at the intersection of the third branch pipe (550) and the arc-shaped connecting pipe (540).

4. The oil-immersed power transformer according to claim 3, characterized in that: The second branch pipe (530) and the third branch pipe (550) are symmetrical with respect to the heat sink (40); and evenly distributed second atomizing nozzles (551) are provided on the side of the second branch pipe (530) facing the third branch pipe (550).

5. The oil-immersed power transformer according to claim 3, characterized in that: A liquid replenishing tank (570) is fixedly connected to the top end of an adjacent heat sink (40), a liquid replenishing valve (571) is provided on the top of the liquid replenishing tank (570), the bottom of the liquid replenishing tank (570) is fixedly connected to the hollow tube (510), and the inner cavity of the liquid replenishing tank (570) is communicated with the inner cavity of the hollow tube (510), a one-way valve (580) is provided at the junction of the liquid replenishing tank (570) and the hollow tube (510), the bottom end of the hollow tube (510) is closed, and an expansion and pressurization assembly (590) is fixedly connected to the outer wall of the hollow tube (510).

6. The oil-immersed power transformer according to claim 5, characterized in that: The expansion and pressurizing assembly (590) comprises a pressurizing tube (591) evenly mounted on the outer wall of the hollow tube (510); the pressurizing tube (591) is connected to the inner cavity of the hollow tube (510); one end of the pressurizing tube (591) away from the hollow tube (510) is fixedly connected to a piston cylinder (592); a piston plate (593) is slidably connected inside the piston cylinder (592); a piston rod (594) is fixedly connected to the outer wall of the piston plate (593); the piston rod (594) passes through the piston cylinder (592) and extends outward; an extended end of the piston rod (594) is connected to a resisting wheel (595); and a compression spring (596) is fixedly connected between the piston plate (593) and the inner wall of the piston cylinder (592).

7. The oil-immersed power transformer according to claim 6, characterized in that: A mounting seat (597) is provided at the junction of the abutment wheel (595) and the piston rod (594).

8. The oil-immersed power transformer according to claim 7, characterized in that: A vibration sensor (598) is provided on the mounting seat (597).

9. The oil-immersed power transformer according to claim 1, characterized in that: The section of the oil inlet pipe (210) placed inside the box (10) is spiral-shaped, and an oil filling port is provided at the top of the box (10).

10. The oil-immersed power transformer according to claim 1, characterized in that: It also includes an oil level gauge and a pressure relief valve, both of which are mounted on the upper wall surface of the box body (10).

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