An oil-immersed power transformer

Abstract

The present invention discloses an oil-immersed power transformer, which relates to the technical field of transformers and includes a bracket. The top end of the bracket is fixedly connected with a bottom box, and the top end of the bottom box is fixedly connected with a transformer end shell. Finned structures are arranged on both the front and rear sides of the transformer end shell. A circulation mechanism is arranged inside the transformer end shell. A liquid circulation mechanism is arranged below the circulation mechanism, and a liquid leakage detection mechanism is arranged above the circulation mechanism. An oil pump is arranged inside the bottom box, and a liquid extraction pipe is connected to the side of the oil pump. The circulation mechanism includes outer frame pipes. There are two outer frame pipes, and the two outer frame pipes are respectively fixedly connected to both sides of the bracket. Two communicating cross frames are fixedly connected inside the transformer end shell. In the present invention, the temperature of the side arch frame can be quickly dissipated, the heat dissipation effect of the side arch frame is promoted, and the heat dissipation efficiency of the insulating oil around the side arch frame is improved.

Description

Technical Field

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

[0002] The oil-immersed power transformer is a common type of transformer, which is widely used in the power system for voltage step-up or step-down. Its main feature is to provide insulation and cooling functions through insulating oil, generally by insulating oil to provide insulation and cooling functions.

[0003] The patent of the transformer with the publication number CN117877863 discloses an oil-immersed power transformer with efficient heat dissipation, including a box body and an oil conservator; a winding is provided inside the box body; a partition plate is provided inside the box body; the partition plate divides the box body into an upper cavity and a lower cavity; the oil conservator is communicated with the upper cavity; a plurality of heat dissipation mechanisms are provided on the outer periphery of the box body; the heat dissipation mechanism includes a fixed fin and a movable fin; the movable fin is movably and telescopically arranged in the fixed fin; an oil storage cavity is formed between the fixed fin and the movable fin; the oil storage cavity is communicated with the lower cavity; the heat dissipation mechanism further includes a driving component for driving the movable fin to expand and contract in the fixed fin. This patent forms a set of heat dissipation systems between the upper cavity and the oil conservator, and forms another set of heat dissipation systems between the lower cavity and the heat dissipation mechanism. The two sets of heat dissipation systems alternately circulate to cool the winding, which can greatly improve the heat dissipation performance of the power transformer. However, this patent has the problem that heat dissipation needs to rely on the driving component, and the driving component will also generate heat during operation, which affects the actual heat dissipation effect. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an oil-immersed power transformer, which solves the problems raised in the above background art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: An oil-immersed power transformer includes a bracket, the top of the bracket is fixedly connected with a bottom box, the top of the bottom box is fixedly connected with a transformer end shell, fin structures are arranged on both the front and rear sides of the transformer end shell, a circulation mechanism is arranged inside the transformer end shell, a liquid circulation mechanism is arranged below the circulation mechanism, a liquid leakage detection mechanism is arranged above the circulation mechanism, an oil pump is arranged inside the bottom box, and a liquid extraction pipe is connected to the side of the oil pump;

[0006] According to the above technical scheme, the circulation mechanism includes an outer frame tube, two of which are provided, and the two outer frame tubes are fixedly connected to the two sides of the bracket respectively, and the inside of the transformer end shell is fixedly connected with two connecting cross frames, and the outer side of the connecting cross frame is fixedly connected with a positioning plate, and the lower part of the positioning plate is fixedly connected with a coil, and the front and rear sides of the connecting cross frame are fixedly connected with four side bow frames, and the side of the side bow frame away from the connecting cross frame is fixedly connected with six thin horizontal square tubes, and both ends of each thin horizontal square tube are fixedly connected with connecting tube fins, and the middle part of the outer side of the outer frame tube is fixedly connected with the air filling end shell;

[0007] According to the above technical solution, the air filling end shell includes a guide block, the guide block is fixedly connected to the middle of the inner wall of the outer frame tube, the side of the guide block is provided with a blast blade, the inner wall of the air filling end shell is fixedly connected with a closed wind arc plate, the inner side of the closed wind arc plate is provided with an air filling impeller, and the interior of the air filling end shell is provided with an air filling channel;

[0008] According to the above technical scheme, a connecting square hole is provided on the outer wall of the transformer end shell, and the connecting square hole is connected with the outer frame tube, the connecting square hole is connected with the connecting cross frame, the side arch frame is connected with the connecting cross frame, the thin cross square tube is connected with the connecting tube fin, the blast blade is rotatably connected with the outer frame tube, the air impeller is fixedly connected with the blast blade axis, when the outside air flows through the connecting tube fins, the air will enter the air filling end shell, the flowing air will pass through the air filling impeller, and flow into the air filling channel from the outer wall of the air filling impeller, so that the air in the air filling channel is discharged, in this process, the air flow through the air filling impeller will make it rotate, and the rotation of the air filling impeller will drive the connected blast blade fitting guide block to rotate, and the rotation of the blast blade will transport the compressed gas in the outer frame tube downward, so that the air in the outer frame tube flows To the connecting cross frame, and then through the connecting cross frame to make the air flow to another outer frame tube, the air flows upward through the outer frame tube and enters the connecting cross frame located above to realize circulation flow. When the air passes through the connecting tube fins, the connecting tube fins will cool the air in the outer frame tube. At the same time, the air in the connecting cross frame enters the side bow frame, so that the side bow frame can cool the surrounding liquid and improve the cooling effect of the insulating oil inside the transformer end shell. At the same time, the connecting cross frame is used to take away the heat generated by the coil on the positioning piece after power is turned on through the internal flowing air. In addition, the connecting tube fins will absorb the heat of the connected thin horizontal square tubes through the flow of external air, and use the thin horizontal square tubes to contact the side bow frame to absorb the heat of the side bow frame, so that the temperature of the side bow frame can be quickly dissipated, which promotes the heat dissipation effect of the side bow frame and improves the heat dissipation efficiency of the insulating oil around the side bow frame.

[0009] According to the above technical solution, the fin structure includes a connecting end, a side of the connecting end away from the transformer end shell is fixedly connected with a plurality of square ring fins, and the inner sides of the plurality of square ring fins are fixedly connected with a connecting air duct;

[0010] According to the above technical solution, the liquid circulation mechanism includes a U-shaped arc cavity plate. On the front and rear sides of the inner wall of the U-shaped arc cavity plate, there are fixedly connected impeller plates. On the side of each impeller plate, there are two impeller blades rotatably connected. At the bottom of each impeller plate, there is a liquid inlet port fixedly connected. On the top surface of the impeller plate, there is a liquid outlet port opened. On the top surface of the U-shaped arc cavity plate, there is a liquid discharge port opened. At the shaft of each impeller blade, there is a rotating handle fixedly connected. On the outer side of the impeller blade, there are two pressure wheels rotatably connected. On the outer side of the pressure wheel, there is a liquid outlet connecting pipe. One end of the liquid outlet connecting pipe is fixedly connected with a liquid inlet connecting pipe, and the other end of the liquid outlet connecting pipe is fixedly connected with one of the side arch frames. The end of the liquid inlet connecting pipe far from the liquid outlet connecting pipe is fixedly connected with the other side arch frame;

[0011] According to the above technical solution, at the bottom of the lower connecting cross frame, there is an alloy wire fixedly connected. At the bottom end of the alloy wire, there is a lifting end shell fixedly connected. On both sides of the bottom surface of the lifting end shell, there are metal contact pieces fixedly connected. On the side of the oil pump, there is an energized wire electrically connected. On the right inner wall of the bottom box, there is a wiring wire fixedly connected. At the top ends of the wiring wire and the energized wire, there are energized contact pieces fixedly connected. The liquid outlet connecting pipe is communicated with the liquid inlet connecting pipe, and the liquid inlet connecting pipe is communicated with the side arch frame. When the temperature of the insulating oil inside the variable voltage end shell rises, the alloy wire in contact with the insulating oil is made of nickel-titanium alloy, and it will contract after absorbing the heat of the insulating oil. The contracted alloy wire will pull the lifting end shell upward, making the metal contact piece connected to the lifting end shell move upward, so that the metal contact piece contacts the energized contact piece after moving upward. At this time, the energized wiring wire contacts the metal contact piece through the energized contact piece connected at the top end, enabling the metal contact piece to energize the energized contact piece connected to the energized wire through the lifting end shell. The energized energized contact piece conducts the current to the oil pump, making the oil pump in a working state after being energized. When the oil pump starts to work, the oil pump pumps the insulating oil in the variable voltage end shell into the U-shaped arc cavity plate through the liquid suction pipe, making the insulating oil in the U-shaped arc cavity plate flow upward. The insulating oil in the U-shaped arc cavity plate enters the impeller plate through the liquid inlet port. The flowing insulating oil drives the impeller blades to rotate in the impeller plate. Subsequently, the insulating oil in the impeller plate is discharged into the top of the variable voltage end shell through the liquid outlet port and the liquid discharge port. During this process, the insulating oil on the side of the U-shaped arc cavity plate enters the communication end through the side of the U-shaped arc cavity plate and enters the square ring fins connected to the communication end. When air passes through the communication duct, the communication duct will take away the heat of the insulating oil in the square ring fins. At the same time, it makes the insulating oil inside the variable voltage end shell flow from bottom to top, preventing the insulating oil from standing still and causing heat accumulation to affect the power transmission efficiency of the coil. In addition, the rotation of the impeller blades drives the connected rotating handle to rotate, making the rotating handle drive the pressure wheel to squeeze the connection between the liquid outlet connecting pipe and the liquid inlet connecting pipe, causing the liquid in the liquid outlet connecting pipe to flow after the liquid outlet connecting pipe and the liquid inlet connecting pipe are pressed, and sucking in the air flow in the two side arch frames connected to the liquid inlet connecting pipe and the liquid outlet connecting pipe. Through the air flow promotion in the above two side arch frames, the flow frequency in the thin horizontal square pipe connected to the side arch frame is promoted.

[0012] According to the above technical solution, the leakage detection mechanism includes a bending plate, and the bending plates are provided with four pieces, and the four bending plates are fixedly connected to the bottom surface of the top plate, and a buoyancy plate is provided between the bending plates at four places, and the top surface of the buoyancy plate is fixedly connected with a metal connecting piece, and the top surface of the metal connecting piece is fixedly connected with a card holder, and the top of the card holder is fixedly connected with a power connection piece, and metal cards are provided on both sides of the top of the card holder, and the top of the metal card is fixedly connected with an alarm, and an inlay groove is provided inside the top plate, and a cavity tube is fixedly connected to the edge side of the buoyancy plate;

[0013] According to the above technical solution, a spring is provided at the bottom end of the bending plate, and the two ends of the spring are fixedly connected to the bending plate and the top plate respectively, the alarm is located inside the inlay groove, and the metal card penetrates from the bottom surface of the top plate to the inside of the inlay groove. When the insulating oil level inside the transformer end shell is normal, the buoyancy of the insulating oil liquid surface pushes the buoyancy plate and the cavity tube to apply force upward, so that the spring on the bending plate below the buoyancy plate is in a stretched state. At this time, the metal connecting piece on the buoyancy plate is in a clamping state with the metal card through the card seat. At this time, the buoyancy plate is stationary. When the transformer end shell leaks and decreases, the buoyancy plate and the bottom of the cavity tube are no longer supported by the buoyancy of the insulating oil, and the spring in a stretched state on the bending plate begins to shrink. The buoyancy plate is pulled downward by the contraction of the spring, so that the card seat is separated from the metal card, and the power connection piece connected to the card seat is moved between the metal cards, so that the metal card is in contact with the power connection piece. At this time, the alarm is in a passage state through the metal card and the power connection piece, so that an alarm is issued through the alarm to prevent the rubber ring from aging and leaking, resulting in equipment failure and environmental pollution.

[0014] The present invention provides an oil-immersed power transformer. It has the following beneficial effects:

[0015] The present invention, by providing an outer frame tube, a connecting cross frame, a positioning piece, a coil, a side bow frame, a thin horizontal square tube, an air filling end shell, a guide block, a blast blade, an air closing arc plate, an air filling impeller, and an air filling channel, enables the side bow frame to cool down the surrounding liquid, thereby improving the cooling effect of the insulating oil inside the transformer end shell, and at the same time, utilizes the connecting cross frame to take away the heat generated by the coil on the positioning piece after being energized through the internal flowing air, and in addition, the connecting tube fins are cooled by the external air flow, absorbing the heat of the connected thin horizontal square tube, and utilize the thin horizontal square tube to contact the side bow frame to absorb the heat of the side bow frame, so that the temperature of the side bow frame can be quickly dissipated, thereby promoting the heat dissipation effect of the side bow frame, and improving the heat dissipation efficiency of the insulating oil around the side bow frame;

[0016] In the present invention, by providing a U-shaped arc cavity plate, a liquid-drum wheel plate, liquid-drum blades, a liquid inlet port, a liquid outlet port, a liquid discharge port, a turning handle, a pressing wheel, a liquid outlet connecting pipe, a liquid inlet connecting pipe, a lifting end shell, alloy wires, metal contacts, and connecting wires, the connecting ventilation duct will carry away the heat of the insulating oil in the square-ring fins. At the same time, the turning handle drives the pressing wheel to squeeze the connection between the liquid outlet connecting pipe and the liquid inlet connecting pipe, so that the liquid in the liquid outlet connecting pipe is pushed to flow after the liquid outlet connecting pipe and the liquid inlet connecting pipe are pressed, and the air flow in the two side arch frames connected to the liquid inlet connecting pipe and the liquid outlet connecting pipe is drawn away. Through the air flow improvement in the above two side arch frames, the flow frequency in the thin horizontal square pipes connected to the side arch frames is promoted.

[0017] In the present invention, by providing a bent plate, a buoyancy plate, a metal connecting piece, a card seat, an electricity connecting piece, a metal card, an alarm, an inlay groove, and a cavity pipe, when the spring contracts, it pulls the buoyancy plate to move downward, causing the card seat to disengage from the metal card, and making the electricity connecting piece connected to the card seat move between the metal cards, so that the metal cards are in contact with the electricity connecting piece. At this time, the alarm is in a conducting state through the metal cards and the electricity connecting piece, and thus an alarm is issued through the alarm to prevent leakage caused by the aging of the rubber ring, resulting in equipment failure and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front three-dimensional structural schematic diagram of the whole of the present invention;

[0019] Figure 2 is a structural schematic diagram of the interior of the whole transformer of the present invention;

[0020] Figure 3 is a structural schematic diagram of the whole circulation mechanism of the present invention;

[0021] Figure 4 is a structural schematic diagram of the interior of the whole air-injecting end shell of the present invention;

[0022] Figure 5 is a structural schematic diagram of the whole fin structure of the present invention;

[0023] Figure 6 is a structural schematic diagram of the whole liquid circulation mechanism of the present invention;

[0024] Figure 7 is the whole of the present invention Figure 6 an enlarged structural schematic diagram of A therein;

[0025] Figure 8 is a structural schematic diagram of the whole liquid leakage detection mechanism of the present invention;

[0026] Figure 9 is the whole of the present invention Figure 8 an enlarged structural schematic diagram of the transformer therein.

[0027] In the figure: 1, support; 2, bottom box; 3, transformer end shell; 4, circulation mechanism; 41, outer frame pipe; 42, connecting cross frame; 43, positioning piece; 44, coil; 45, side bow frame; 46, thin horizontal square pipe; 47, air injection end shell; 471, guiding block; 472, air blowing blade; 473, air closing arc plate; 474, air injection impeller; 475, air injection channel; 48, connecting pipe fin; 5, fin structure; 51, connecting end; 52, connecting ventilation duct; 53, square ring fin; 6, top plate; 7, liquid circulation mechanism; 71, U-arc cavity plate; 72, liquid pumping wheel plate; 73, liquid pumping blade; 74, liquid inlet port; 75, liquid outlet port; 76, liquid discharge port; 77, turning handle; 78, pressing wheel; 79, liquid outlet connecting pipe; 710, liquid inlet connecting pipe; 711, lifting end shell; 712, alloy wire; 713, metal contact piece; 714, connecting wire; 715, energized wire; 716, energized contact piece; 8, liquid leakage detection mechanism; 81, bent plate; 82, buoyancy plate; 83, metal connecting piece; 84, card seat; 85, power connection piece; 86, metal card; 87, alarm; 88, inlay groove; 89, cavity pipe; 9, oil pump; 10, liquid extraction pipe. Detailed implementation manner

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0029] Please refer to Figures 1-9 , the embodiment of the present invention is: an oil-immersed power transformer, including a support 1, a bottom box 2 is fixedly connected to the top end of the support 1, a transformer end shell 3 is fixedly connected to the top end of the bottom box 2, fin structures 5 are arranged on both the front and rear sides of the transformer end shell 3, a circulation mechanism 4 is arranged inside the transformer end shell 3, a liquid circulation mechanism 7 is arranged below the circulation mechanism 4, a liquid leakage detection mechanism 8 is arranged above the circulation mechanism 4, an oil pump 9 is arranged inside the bottom box 2, and a liquid extraction pipe 10 is connected to the side of the oil pump 9;

[0030] The circulation mechanism 4 includes outer frame pipes 41. There are two outer frame pipes 41, and the two outer frame pipes 41 are respectively fixedly connected to both sides of the support 1. Two connecting cross frames 42 are fixedly connected inside the transformer end shell 3. A positioning piece 43 is fixedly connected to the outside of the connecting cross frame 42. A coil 44 is fixedly connected below the positioning piece 43. Four side bow frames 45 are fixedly connected to both the front and rear sides of the connecting cross frame 42. Six thin horizontal square pipes 46 are fixedly connected to the side of the side bow frame 45 far from the connecting cross frame 42. Connecting pipe fins 48 are fixedly connected to both ends of each thin horizontal square pipe 46. An air injection end shell 47 is fixedly connected to the middle of the outside of the outer frame pipe 41;

[0031] The air filling end shell 47 includes a guide block 471, which is fixedly connected to the middle of the inner wall of the outer frame tube 41, and a blast blade 472 is arranged on the side of the guide block 471. A wind arc closing plate 473 is fixedly connected to the inner wall of the air filling end shell 47, and an air filling impeller 474 is arranged on the inner side of the wind arc closing plate 473. An air filling channel 475 is opened inside the air filling end shell 47.

[0032] A connecting square hole is provided on the outer wall of the transformer end shell 3, and the connecting square hole is connected to the outer frame tube 41, the connecting square hole is connected to the connecting cross frame 42, the side frame 45 is connected to the connecting cross frame 42, the thin cross square tube 46 is connected to the connecting tube fin 48, the blast blade 472 is rotatably connected to the outer frame tube 41, and the air injection impeller 474 is fixedly connected to the axial center of the blast blade 472, so that the side frame 45 cools the surrounding liquid and improves the cooling effect of the insulating oil inside the transformer end shell 3. At the same time, the connecting cross frame 42 is used to take away the heat generated by the coil 44 on the positioning piece 43 after power is turned on by the internal flowing air. In addition, the connecting tube fin 48 absorbs the heat of the connected thin cross square tube 46 through the flow of external air, and uses the thin cross square tube 46 to contact the side frame 45 to absorb the heat of the side frame 45, so that the temperature of the side frame 45 can be quickly dissipated, the heat dissipation effect of the side frame 45 is promoted, and the heat dissipation efficiency of the insulating oil around the side frame 45 is improved.

[0033] The fin structure 5 includes a connecting end 51, a side of the connecting end 51 away from the transformer end shell 3 is fixedly connected with a plurality of square ring fins 53, and a connecting air duct 52 is fixedly connected inside the plurality of square ring fins 53;

[0034] The liquid circulation mechanism 7 comprises a U-arc cavity plate 71, the front and rear sides of the inner wall of the U-arc cavity plate 71 are fixedly connected with a drum liquid wheel plate 72, the side of each drum liquid wheel plate 72 is rotatably connected with two drum liquid blades 73, the bottom surface of the drum liquid wheel plate 72 is fixedly connected with a liquid inlet port 74, the top surface of the drum liquid wheel plate 72 is provided with a liquid outlet port 75, the top surface of the U-arc cavity plate 71 is provided with a liquid discharge port 76, the rotating shaft of each drum liquid blade 73 is fixedly connected with a rotating handle 77, the outer side of the drum liquid blade 73 is rotatably connected with two pressure wheels 78, the outer side of the pressure wheel 78 is provided with a liquid outlet connecting pipe 79, one end of the liquid outlet connecting pipe 79 is fixedly connected with a liquid inlet connecting pipe 710, and the other end of the liquid outlet connecting pipe 79 is fixedly connected to one of the side arch frames 45, and the end of the liquid inlet connecting pipe 710 away from the liquid outlet connecting pipe 79 is fixedly connected to the other side arch frame 45;

[0035] A alloy wire 712 is fixedly connected to the bottom surface of the lower connecting cross-frame 42. The bottom end of the alloy wire 712 is fixedly connected to a lifting end shell 711. Metal contacts 713 are fixedly connected to both sides of the bottom surface of the lifting end shell 711. An energized wire 715 is electrically connected to the side of the oil pump 9. A wiring wire 714 is fixedly connected to the right inner wall of the bottom box 2. Energized contacts 716 are fixedly connected to the top ends of the wiring wire 714 and the energized wire 715. The liquid outlet connecting pipe 79 is communicated with the liquid inlet connecting pipe 710. The liquid inlet connecting pipe 710 is communicated with the side bow frame 45. The connecting air duct 52 will take away the heat of the insulating oil in the square ring fins 53. At the same time, it allows the insulating oil inside the transformer end shell 3 to flow from bottom to top, preventing the heat from accumulating due to the static state of the insulating oil and affecting the power transmission efficiency of the coil 44. In addition, the rotation of the liquid-pumping blade 73 drives the connected rotating handle 77 to rotate, so that the rotating handle 77 drives the pressing wheel 78 to squeeze the connection between the liquid outlet connecting pipe 79 and the liquid inlet connecting pipe 710. After the liquid outlet connecting pipe 79 and the liquid inlet connecting pipe 710 are pressed, it promotes the liquid flow in the liquid outlet connecting pipe 79, and draws away the air flow of the two side bow frames 45 connected to the liquid inlet connecting pipe 710 and the liquid outlet connecting pipe 79. Through the air flow improvement in the above two side bow frames 45, the flow frequency in the thin horizontal square pipe 46 connected to the side bow frame 45 is promoted.

[0036] The liquid leakage detection mechanism 8 includes a bending plate 81. There are four bending plates 81, and all four bending plates 81 are fixedly connected to the bottom surface of the top plate 6. A buoyancy plate 82 is arranged between the four bending plates 81. A metal connecting piece 83 is fixedly connected to the top surface of the buoyancy plate 82. A card seat 84 is fixedly connected to the top surface of the metal connecting piece 83. A power connection piece 85 is fixedly connected to the top end of the card seat 84. Metal cards 86 are arranged on both sides of the top end of the card seat 84. An alarm 87 is fixedly connected to the top end of the metal card 86. An inlay groove 88 is opened inside the top plate 6. A cavity pipe 89 is fixedly connected to the edge side surface of the buoyancy plate 82;

[0037] A spring is arranged at the bottom end of the bending plate 81, and both ends of the spring are fixedly connected to the bending plate 81 and the top plate 6 respectively. The alarm 87 is located inside the inlay groove 88. The metal card 86 penetrates from the bottom surface of the top plate 6 to the inside of the inlay groove 88. By the contraction of the spring, the buoyancy plate 82 is pulled to move downward, so that the card seat 84 is separated from the metal card 86, and the power connection piece 85 connected to the card seat 84 moves between the metal cards 86, making the metal cards 86 contact with the power connection piece 85. At this time, the alarm 87 is in a conducting state through the metal cards 86 and the power connection piece 85, so as to send out an alarm through the alarm 87, preventing rubber rings from aging and leaking, resulting in equipment failure and environmental pollution.

[0038] Working principle: When the outside air flows through between the connecting pipe fins 48, the air will enter the air injection end shell 47. The flowing air passes through the air injection impeller 474 and flows into the air injection channel 475 from the outer wall of the air injection impeller 474, allowing the air in the air injection channel 475 to be discharged. During this process, the flowing air passing through the air injection impeller 474 will cause it to rotate. The rotation of the air injection impeller 474 drives the connected air blowing blades 472 to rotate along with the guiding block 471. The rotation of the air blowing blades 472 conveys the compressed gas in the outer frame pipe 41 downward, causing the air in the outer frame pipe 41 to flow into the connecting cross frame 42, and then through the connecting cross frame 42, the air flows into another outer frame pipe 41. The air flows upward through this outer frame pipe 41 and enters the connecting cross frame 42 located above, realizing circular flow. When the air passes through the connecting pipe fins 48, the connecting pipe fins 48 will cool the air in the outer frame pipe 41. At the same time, the air in the connecting cross frame 42 enters the side bow frame 45, enabling the side bow frame 45 to cool the surrounding liquid, enhancing the cooling effect of the insulating oil inside the variable pressure end shell 3. At the same time, the connecting cross frame 42 uses the flowing air inside to take away the heat generated after the coil 44 on the positioning piece 43 is energized. In addition, the connecting pipe fins 48 will absorb the heat of the connected thin horizontal square pipe 46 through the cooling of the outside air flow, and use the thin horizontal square pipe 46 to contact the side bow frame 45 to absorb the heat of the side bow frame 45, so that the temperature of the side bow frame 45 can be quickly dissipated, promoting the heat dissipation effect of the side bow frame 45 and enhancing the heat dissipation efficiency of the insulating oil around the side bow frame 45;

[0039] When the temperature of the insulating oil inside the transformer terminal housing 3 rises, the alloy wire 712 in contact with the insulating oil is made of nickel-titanium alloy. It will contract after absorbing the heat of the insulating oil. The contracted alloy wire 712 will pull the lifting terminal housing 711 upward, causing the metal contact 713 connected to the lifting terminal housing 711 to move upward, so that the metal contact 713 contacts the energized contact 716 after moving upward. At this time, the energized wiring wire 714 contacts the metal contact 713 through the energized contact 716 connected at the top, enabling the metal contact 713 to energize the energized contact 716 connected to the energized wire 715 through the lifting terminal housing 711. The energized energized contact 716 conducts the current to the oil pump 9, making the oil pump 9 in a working state after being energized. When the oil pump 9 starts to work, the oil pump 9 pumps the insulating oil in the transformer terminal housing 3 into the U-arc cavity plate 71 through the liquid suction pipe 10, causing the insulating oil in the U-arc cavity plate 71 to flow upward. The insulating oil in the U-arc cavity plate 71 enters the drum liquid wheel plate 72 through the liquid inlet port 74. The flowing insulating oil enters the drum liquid wheel plate 72 and drives the drum liquid blades 73 to rotate. Subsequently, the insulating oil in the drum liquid wheel plate 72 is discharged into the top of the transformer terminal housing 3 through the liquid outlet port 75 and the liquid discharge port 76. During this process, the insulating oil on the side of the U-arc cavity plate 71 enters the communication end 51 through the side of the U-arc cavity plate 71 and enters the square ring fins 53 connected to the communication end 51. When air passes through the communication duct 52, the communication duct 52 will take away the heat of the insulating oil in the square ring fins 53. At the same time, it makes the insulating oil inside the transformer terminal housing 3 flow from bottom to top, preventing the insulating oil from standing still and causing heat accumulation to affect the power transmission efficiency of the coil 44. In addition, the rotation of the drum liquid blades 73 drives the connected rotating handle 77 to rotate, causing the rotating handle 77 to drive the pressure wheel 78 to squeeze the connection between the liquid outlet connecting pipe 79 and the liquid inlet connecting pipe 710, so that the liquid outlet connecting pipe 79 and the liquid inlet connecting pipe 710 are pressed to push the liquid in the liquid outlet connecting pipe 79 to flow, and the air flow in the two side arch frames 45 connected to the liquid inlet connecting pipe 710 and the liquid outlet connecting pipe 79 is sucked away. Through the air flow improvement in the above two side arch frames 45, the flow frequency in the thin horizontal square pipe 46 connected to the side arch frames 45 is promoted;

[0040] When the insulating oil level inside the transformer end shell 3 is normal, the buoyancy of the insulating oil surface pushes the buoyancy plate 82 and the cavity tube 89 upward, causing the spring on the bending plate 81 below the buoyancy plate 82 to be in a stretched state. At this time, the metal connecting piece 83 on the buoyancy plate 82 is in a clamped state with the metal card 86 through the card seat 84, and the buoyancy plate 82 is stationary. When the transformer end shell 3 leaks and the oil level decreases, the bottom of the buoyancy plate 82 and the cavity tube 89 are no longer supported by the buoyancy of the insulating oil. The spring in the stretched state on the bending plate 81 begins to contract, pulling the buoyancy plate 82 downward through the spring contraction, causing the card seat 84 to disengage from the metal card 86, and moving the electrical connection piece 85 connected to the card seat 84 between the metal cards 86, making the metal card 86 contact the electrical connection piece 85. At this time, the alarm 87 is in a conductive state through the metal card 86 and the electrical connection piece 85, so as to issue an alarm through the alarm 87, preventing rubber ring aging and leakage, resulting in equipment failure and environmental pollution.

[0041] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. An oil-immersed power transformer, comprising a bracket (1), characterized in that: The top end of the bracket (1) is fixedly connected with a bottom box (2), the top end of the bottom box (2) is fixedly connected with a transformer end shell (3), fin structures (5) are arranged on both the front and rear sides of the transformer end shell (3), a circulation mechanism (4) is arranged inside the transformer end shell (3), a liquid circulation mechanism (7) is arranged below the circulation mechanism (4), a liquid leakage detection mechanism (8) is arranged above the circulation mechanism (4), an oil pump (9) is arranged inside the bottom box (2), and a liquid extraction pipe (10) is connected to the side of the oil pump (9); The circulation mechanism (4) includes outer frame pipes (41), there are two outer frame pipes (41), the two outer frame pipes (41) are respectively fixedly connected to both sides of the bracket (1), two communicating cross frames (42) are fixedly connected inside the transformer end shell (3), positioning pieces (43) are fixedly connected to the outer sides of the communicating cross frames (42), coils (44) are fixedly connected below the positioning pieces (43), four side bow frames (45) are fixedly connected to both the front and rear sides of the communicating cross frames (42), six thin horizontal square pipes (46) are fixedly connected to the sides of the side bow frames (45) far away from the communicating cross frames (42), connecting pipe fins (48) are fixedly connected to both ends of each thin horizontal square pipe (46), and an air injection end shell (47) is fixedly connected to the middle of the outer side of the outer frame pipe (41); The air injection end shell (47) includes a guiding block (471), the guiding block (471) is fixedly connected to the middle of the inner wall of the outer frame pipe (41), air blowing blades (472) are arranged on the side of the guiding block (471), a wind closing arc plate (473) is fixedly connected to the inner wall of the air injection end shell (47), an air injection impeller (474) is arranged inside the wind closing arc plate (473), and an air injection channel (475) is opened inside the air injection end shell (47); A communicating square hole is opened on the outer wall of the transformer end shell (3), and the communicating square hole is communicated with the outer frame pipe (41), the communicating square hole is communicated with the communicating cross frame (42), the side bow frame (45) is communicated with the communicating cross frame (42), the thin horizontal square pipe (46) is communicated with the connecting pipe fin (48), the air blowing blade (472) is rotatably connected to the outer frame pipe (41), and the air injection impeller (474) is fixedly connected to the axis of the air blowing blade (472).

2. The oil-immersed power transformer according to claim 1, characterized in that: The fin structure (5) includes a communicating end (51), a plurality of square ring fins (53) are fixedly connected to the side of the communicating end (51) far away from the transformer end shell (3), and a connecting ventilation duct (52) is fixedly connected inside the plurality of square ring fins (53).

3. An oil-immersed power transformer according to claim 2, characterized in that: The liquid circulation mechanism (7) includes a U-shaped arc cavity plate (71). On the front and back sides of the inner wall of the U-shaped arc cavity plate (71), liquid-drum plates (72) are fixedly connected. On the side of each liquid-drum plate (72), two liquid-drum blades (73) are rotatably connected. At the bottom surface of the liquid-drum plate (72), a liquid inlet port (74) is fixedly connected. At the top surface of the liquid-drum plate (72), a liquid outlet port (75) is provided. At the top surface of the U-shaped arc cavity plate (71), a liquid discharge port (76) is provided. At the rotating shaft of each liquid-drum blade (73), a rotating handle (77) is fixedly connected. On the outer side of the liquid-drum blade (73), two pressure wheels (78) are rotatably connected. On the outer side of the pressure wheel (78), a liquid outlet connecting pipe (79) is provided. One end of the liquid outlet connecting pipe (79) is fixedly connected with a liquid inlet connecting pipe (710), and the other end of the liquid outlet connecting pipe (79) is fixedly connected with one of the side bow frames (45). The end of the liquid inlet connecting pipe (710) far from the liquid outlet connecting pipe (79) is fixedly connected with the other side bow frame (45).

4. An oil-immersed power transformer according to claim 3, characterized in that: At the bottom surface of the lower connecting cross frame (42), an alloy wire (712) is fixedly connected. At the bottom end of the alloy wire (712), a lifting end shell (711) is fixedly connected. On both sides of the bottom surface of the lifting end shell (711), metal contact pieces (713) are fixedly connected. On the side of the oil pump (9), an energized wire (715) is electrically connected. At the right inner wall of the bottom box (2), a wiring wire (714) is fixedly connected. At the top ends of the wiring wire (714) and the energized wire (715), energized contact pieces (716) are fixedly connected. The liquid outlet connecting pipe (79) is communicated with the liquid inlet connecting pipe (710), and the liquid inlet connecting pipe (710) is communicated with the side bow frame (45).

5. An oil-immersed power transformer according to claim 4, characterized in that: The liquid leakage detection mechanism (8) includes bending plates (81). There are four bending plates (81), and the four bending plates (81) are all fixedly connected to the bottom surface of the top plate (6). Between the four bending plates (81), a buoyancy plate (82) is provided. On the top surface of the buoyancy plate (82), a metal connecting piece (83) is fixedly connected. On the top surface of the metal connecting piece (83), a card seat (84) is fixedly connected. At the top end of the card seat (84), a power connection piece (85) is fixedly connected. On both sides of the top end of the card seat (84), metal cards (86) are provided. At the top end of the metal card (86), an alarm (87) is fixedly connected. Inside the top plate (6), an inlay groove (88) is provided. On the edge side surface of the buoyancy plate (82), a cavity pipe (89) is fixedly connected.

6. The oil-immersed power transformer according to claim 5, characterized in that: At the bottom end of the bending plate (81), a spring is provided, and the two ends of the spring are respectively fixedly connected with the bending plate (81) and the top plate (6). The alarm (87) is located inside the inlay groove (88), and the metal card (86) penetrates from the bottom surface of the top plate (6) into the inlay groove (88).

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