CN112382467A

CN112382467A - Oil-immersed power transformer

Info

Publication number: CN112382467A
Application number: CN202011151207.0A
Authority: CN
Inventors: 张于标
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-25
Filing date: 2020-10-25
Publication date: 2021-02-19

Abstract

The invention discloses an oil-immersed power transformer, which structurally comprises an oil tank, a heat dissipation device, corrugated heat dissipation fins, a high-voltage terminal, a low-voltage terminal, an oil pipe, an oil conservator and a support frame, wherein the top of the oil tank is mechanically connected with the support frame, the oil conservator is installed on the support frame, and the oil conservator is communicated with the oil tank through the oil pipe. Set up the communicating cooling tube with the oil tank outside the oil tank, realize the direct contact of oil and cooling tube, the heat dissipation of the oil of being convenient for, and the wave form is laid to the outer U type fin that adopts different specifications of cooling tube, do benefit to the circulation of air, can further improve the radiating efficiency, add the piston piece in the cooling tube, the tape measure, parts such as bellows, can reduce oily heat in pushing into the oil tank with oil, can realize transformer oil's quick heat dissipation, and the piston piece can prevent when pushing away oil that transformer oil from remaining the adhesion in the cooling tube, from preventing that the internal wall passageway of cooling tube diminishes and reduce oily flux, avoid oil heat dissipation to receive the influence.

Description

Oil-immersed power transformer

Technical Field

The invention relates to the technical field of transformers, in particular to an oil-immersed power transformer.

Background

Transformer oil has much higher dielectric strength than the air, insulating material soaks in oil, not only can improve dielectric strength, but also can avoid the erosion of moisture, in the transformer, in order to strengthen insulating and cooling condition, the iron core of transformer and winding all soak in the oil tank of having filled transformer oil together, the transformer has increased the conservator usually, when transformer oil expends with heat, oil flows to the conservator by the oil tank, when transformer oil contracts with cold, oil flows to the oil tank by the conservator, current oil-immersed transformer is the direct fin that is peripheral hardware at the oil tank, it is so that fin and oil tank contact, transformer oil in the oil tank reaches transformer oil's heat dissipation through the heat dissipation of oil tank, this kind can lead to the radiating efficiency low, can not dispel the heat to transformer oil fast.

Disclosure of Invention

The invention mainly aims to overcome the defects of the prior art and provides an oil-immersed power transformer.

The invention is realized by adopting the following technical scheme: the utility model provides an oil-immersed power transformer, its structure is including oil tank, heat abstractor, ripple U type fin, high voltage terminal, low voltage terminal, oil pipe, conservator, support frame, the top mechanical connection of oil tank has the support frame, install the conservator on the support frame, the conservator passes through oil pipe and oil tank intercommunication, high voltage terminal, low voltage terminal are installed to the top surface of oil tank, the both sides face of oil tank all is equipped with ripple U type fin, heat abstractor is installed in the front of oil tank.

The radiating device comprises radiating tubes and a power connecting box, wherein nine radiating tubes are arranged in parallel in an equidistant mode, the center of one surface, away from the oil tank, of each radiating tube is connected with the power connecting box, and two ends of each radiating tube are communicated with the oil tank;

as the optimization, the cooling tube is including U type fin, radiating tube body, flexible subassembly, connecting pipe, No. two flexible subassemblies, the connecting pipe runs through the one side center of keeping away from the oil tank in the cooling tube, the both ends of connecting pipe all are equipped with U type fin, U type fin is fixed on the radiating tube body, be equipped with a flexible subassembly of matched with it, No. two flexible subassemblies in the radiating tube body, flexible subassembly, No. two flexible subassemblies all are connected with the connecting pipe, the radiating tube body communicates in the oil tank, connecting pipe, radiating tube body all are connected with the power connection box.

The power connection box comprises a box body, a first lightweight board, a first connecting rod, a gas storage bag, a second lightweight board, a third lightweight board, a fourth lightweight board, a rotation group, a second connecting rod and a transmission belt, wherein the first lightweight board, the second lightweight board, the third lightweight board and the fourth lightweight board are arranged in the box body, the gas storage bags are uniformly distributed between the first lightweight board and the second lightweight board and between the third lightweight board and the fourth lightweight board, four rotation groups are arranged on two inner side surfaces of the box body, the four rotation groups on the same side are in transmission fit through the transmission belt, one end of each rotation group is connected with the first connecting rod, the other end of each rotation group is connected with the second connecting rod, the first connecting rod is connected with the outer walls of the first lightweight board and the third lightweight board, the second connecting rod is connected with the outer walls of the second lightweight board and the fourth lightweight board, two longitudinally adjacent gas storage bags are in seamless communication with the connection pipe through a Y-shaped pipe, the box body is vertically connected with the heat radiation pipe body.

Preferably, the rotating group comprises a driving wheel, a supporting plate, a second guide wheel, a supporting guide groove, a rotating shaft and a first guide wheel, the driving wheel is fixed at the center of one surface, facing the box body, of the supporting plate, the driving wheel is connected to the box body through the rotating shaft, the supporting guide groove is formed in the surface, far away from the driving wheel, of the supporting plate, the first guide wheel and the second guide wheel are movably matched with each other in the supporting guide groove, the second guide wheel is movably connected with the second connecting rod, the first guide wheel is movably connected with the first connecting rod, and the driving wheel is matched with.

As an optimization, the first telescopic assembly comprises a piston block, a flexible rule, a fixing plate, a corrugated pipe and two gas pipes, wherein the two gas pipes are arranged in parallel, the flexible rule is arranged between the two gas pipes, a shell of the flexible rule is connected with the gas pipes, one end of each gas pipe penetrates through the fixing plate, the other end of each gas pipe is communicated with a connecting pipe, one end of each corrugated pipe is connected with the fixing plate, the other end of each corrugated pipe is connected with the piston block, the piston block is in transition fit with the heat dissipation pipe body, the heat dissipation pipe body is fixedly connected with the fixing plate, and an inner scroll strip of the flexible rule penetrates through the corrugated pipe and.

Preferably, the fixing plate comprises a plate body, two grooves and a through hole, the grooves are formed in the plate body and communicated with the through hole, the through holes are integrally formed with the plate body, the grooves are connected with one end of the corrugated pipe in a seamless mode, the through hole is in transition fit with the gas pipe, and the gas pipe penetrates through the through hole and the grooves and is communicated with the corrugated pipe.

Advantageous effects

Compared with the prior art, the invention provides an oil-immersed power transformer, which has the following beneficial effects:

the rotating shaft is driven by the micromotor to rotate anticlockwise, the driving wheel drives the driving wheel to rotate, the driving wheel drives other rotating groups matched with the driving wheel to move through the driving belt, the driving wheel rotates to drive the supporting plate which is relatively static, the first guide wheel and the second guide wheel in the supporting plate move towards the tail end direction of the supporting plate under the guiding action of the supporting guide groove due to the limitation of the first connecting rod and the second connecting rod, the first guide wheel generates pulling force on the first connecting rod, the second guide wheel generates pulling force on the second connecting rod, the first connecting rod enables the first lightweight plate and the third lightweight plate to descend, the second connecting rod enables the second lightweight plate and the fourth lightweight plate to ascend, namely, the first lightweight plate and the second lightweight plate displace in opposite directions, the third lightweight plate and the fourth lightweight plate displace in opposite directions, and the first lightweight plate and the second lightweight plate extrude the gas storage bag between the first lightweight plate and the fourth lightweight plate, the third lightweight plate and the fourth lightweight plate also extrude the gas storage bag between the third lightweight plate and the fourth lightweight plate, so that the gas storage bag is pressurized and exhausted, gas is conveyed into the connecting pipe through the pipe and enters the corrugated pipe through the gas conveying pipe, the piston block is pushed, the corrugated pipe extends, and the inner coil strip of the tape measure is stretched, so that the transformer oil can be pushed out by the gas storage bag, the transformer oil adhered to the inner wall of the heat dissipation pipe body can be scraped while the gas storage bag is pushed out, the inner wall channel of the heat dissipation pipe body is prevented from being reduced, the oil flux is reduced, and the influence on oil heat dissipation can be avoided;

through micromotor drive pivot clockwise turning, through first connecting rod, the second connecting rod, a guide pulley, No. two guide pulleys make a light board, No. two light boards, No. three light boards, No. four light boards release the pressure to the gas reservoir bag, make the gas reservoir bag breathe in that can reset, make the gas in the bellows can flow back, including the interior book strip atress of tape measure reduces and because will reset and produce the pulling force to the piston block, make the piston block can be to the translation of connecting pipe direction, thereby make transformer oil can get into and store in the cooling tube, the heat dissipation.

In summary, the invention adds the radiating pipe communicated with the oil tank outside the oil tank, so that the transformer oil can be radiated in the radiating pipe, thereby realizing the direct contact between the transformer oil and the radiating pipe, facilitating the radiation of the transformer oil, and the radiating pipe is externally distributed in a size sequence by adopting U-shaped radiating fins with different specifications, forming a wave shape, facilitating the circulation of air, thereby further improving the radiating efficiency.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic structural diagram of an oil-immersed power transformer according to the present invention.

Fig. 2 is a schematic side view of the heat dissipation device of the present invention.

Fig. 3 is a schematic cross-sectional view illustrating a first operation state of the heat dissipating pipe of the present invention.

Fig. 4 is a schematic structural view of the power connection box of the present invention.

Fig. 5 is a schematic structural diagram of the rotating group of the present invention.

Fig. 6 is an enlarged schematic view of a in fig. 3.

Fig. 7 is a schematic cross-sectional view illustrating a second operation state of the heat dissipating pipe of the present invention.

Fig. 8 is an enlarged structural diagram of B in fig. 7.

Fig. 9 is a schematic cross-sectional view of a fixing plate according to the present invention.

In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

the cooling structure comprises an oil tank 1, a heat dissipation device 2, a corrugated heat dissipation sheet 3, a high-pressure terminal 4, a low-pressure terminal 5, an oil pipe 6, an oil conservator 7, a support frame 8, a heat dissipation pipe Q, a power connection box P, U type heat dissipation sheet Q1, a heat dissipation pipe body Q2, a first telescopic assembly Q3, a connecting pipe Q4, a second telescopic assembly Q5, a box body a, a first light plate b, a first connecting rod c, an air storage bag d, a second light plate e, a third light plate f, a fourth light plate g, a rotating group h, a second connecting rod i, a transmission belt j, a transmission wheel h1, a support plate h2, a second guide wheel h3, a support guide groove h4, a rotating shaft h5, a first guide wheel h6, a piston block Q31, a measuring tape Q32, a fixing plate Q33, a corrugated pipe Q34, a gas pipe Q35, a plate body 331.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 1-5, the present invention provides a technical solution of an oil-immersed power transformer: the utility model provides an oil-immersed power transformer, its structure is including oil tank 1, heat abstractor 2, ripple type fin 3, high voltage terminal 4, low voltage terminal 5, oil pipe 6, conservator 7, support frame 8, the top mechanical connection of oil tank 1 has support frame 8, install conservator 7 on the support frame 8, conservator 7 passes through

oil pipe

6 and 1 intercommunication of oil tank, high voltage terminal 4, low voltage terminal 5 are installed to the top surface of oil tank 1, the both sides face of oil tank 1 all is equipped with ripple type fin 3, heat abstractor 2 is installed in the front of oil tank 1.

The heat dissipation device 2 comprises nine heat dissipation tubes Q and a power connection box P, the nine heat dissipation tubes Q are arranged in parallel in an equidistant mode, the centers of the surfaces, far away from the oil tank 1, of the heat dissipation tubes Q are connected with the power connection box P, and two ends of each heat dissipation tube Q are communicated with the oil tank 1;

above-mentioned U type fin Q1's setting can further dispel the heat to heat dissipation body Q2, helps improving the heat dissipation of transformer oil in the heat dissipation body Q2, and the specification that U type fin Q1 on the heat dissipation body Q adopted is different, carries out the size through the U type fin Q1 of different specifications and arranges in an order, forms the wavy, does benefit to the circulation of air to can further improve the radiating efficiency.

The power connecting box P comprises a box body a, a first light plate b, a first connecting rod c, a gas storage bag d, a second light plate e, a third light plate f, a fourth light plate g, a rotating group h, a second connecting rod i and a transmission belt j, wherein the first light plate b, the second light plate e, the third light plate f and the fourth light plate g are arranged in the box body a, the gas storage bag d is uniformly distributed between the first light plate b and the second light plate e and between the third light plate f and the fourth light plate g, four rotating groups h are arranged on two inner side faces of the box body a, the four rotating groups h on the same side are in transmission fit through the transmission belt j, one end of each rotating group h is connected with the first connecting rod c, the other end of each rotating group h is connected with the second connecting rod i, the first connecting rod c is connected with the outer walls of the first light plate b and the third light plate f, and the second connecting rod i is connected with the second light plate e, And two longitudinally adjacent air storage bags d on the outer wall of the fourth lightweight plate g are seamlessly communicated with a connecting pipe Q4 through a Y-shaped pipe, and the box body a is vertically connected with a heat radiation pipe body Q2.

The combination of the first connecting rod c and the second connecting rod i enables the first light plate b and the third light plate f to synchronously displace, and the second light plate e and the fourth light plate g to synchronously displace, so that force can be applied to the air storage bag d, and pressure on the air storage bag d is released.

The air storage bag d is arranged to exhaust air under pressure and suck air under reset.

The rotating group h comprises a driving wheel h1, a supporting plate h2, a second guide wheel h3, a supporting guide groove h4, a rotating shaft h5 and a first guide wheel h6, wherein the driving wheel h1 is fixed on the center of one side, facing the box body a, of the supporting plate h2, the driving wheel h1 is connected to the box body a through a rotating shaft h5, the supporting guide groove h4 is formed in one side, facing away from the driving wheel h1, of the supporting plate h2, the first guide wheel h6 and the second guide wheel h3 are movably matched with the supporting guide groove h4, the second guide wheel h3 is movably connected with a second connecting rod i, the first guide wheel h6 is movably connected to a first connecting rod c, and the driving wheel h1 is matched with a driving.

The combination of the supporting plate h2 and the supporting guide groove h4 plays a role in guiding and supporting the second guide wheel h3 and the first guide wheel h6, and the first light plate b, the second light plate e, the third light plate f and the fourth light plate g are supported by the connecting effect of the first connecting rod c and the second connecting rod i.

Example 2

Referring to fig. 1-3, 6-9, the present invention provides a technical solution of an oil-immersed power transformer: the utility model provides an oil-immersed power transformer, its structure is including oil tank 1, heat abstractor 2, ripple type fin 3, high voltage terminal 4, low voltage terminal 5, oil pipe 6, conservator 7, support frame 8, the top mechanical connection of oil tank 1 has support frame 8, install conservator 7 on the support frame 8, conservator 7 passes through

oil pipe

the cooling tube Q is including U type fin Q1, heat dissipation body Q2, a flexible subassembly Q3, connecting pipe Q4, No. two flexible subassemblies Q5, connecting pipe Q4 runs through the center of the one side of keeping away from oil tank 1 in cooling tube Q, the both ends of connecting pipe Q4 all are equipped with U type fin Q1, U type fin Q1 is fixed on heat dissipation body Q2, be equipped with in heat dissipation body Q2 with it a matched with flexible subassembly Q3, No. two flexible subassemblies Q5, a flexible subassembly Q3, No. two flexible subassemblies Q5 all are connected with connecting pipe Q4, heat dissipation body Q2 communicates in oil tank 1, connecting pipe Q4, heat dissipation body Q2 all are connected with power connection box P.

The first telescopic assembly Q3 comprises a piston block Q31, two measuring tapes Q32, a fixing plate Q33, a corrugated pipe Q34 and an air conveying pipe Q35, two air conveying pipes Q35 are arranged in parallel, a measuring tape Q32 is arranged between the two air conveying pipes Q35, the shell of the measuring tape Q32 is connected with the air conveying pipe Q35, one end of the air conveying pipe Q35 penetrates through the fixing plate Q33, the other end of the air conveying pipe Q35 is communicated with a connecting pipe Q4, one end of the corrugated pipe Q34 is connected with the fixing plate Q33, the other end of the corrugated pipe Q34 is connected with a piston block Q31, the piston block Q31 is in transition fit with a heat dissipation pipe body Q2, the heat dissipation pipe body Q2 is fixedly connected with the fixing plate Q33, and the inner winding strip of the measuring tape Q32 penetrates through the.

The tape measure Q32 is arranged so that the inner wrap can be pulled in tension and returned when not under tension, so that the return produces a pulling force on the piston block Q31 to facilitate the return of the piston block Q31.

The arrangement of the piston block Q31 can push the transformer oil in the heat radiation pipe body Q2 outwards, and can scrape the transformer oil adhered to the inner wall of the heat radiation pipe body Q2 when the transformer oil is pushed outwards, so that the phenomenon that the oil flux is reduced due to the fact that the channel of the inner wall of the heat radiation pipe body Q2 is reduced is prevented, and the influence of oil heat radiation can be avoided.

The bellows Q34 is provided to have a telescopic property, a small occupied area when compressed, and a long distance when extended, thereby enabling displacement and return of the piston block Q31.

The fixed plate Q33 is including plate body 331, recess 332, through-hole 333, recess 332 has been seted up to plate body 331, recess 332 communicates with each other with through-hole 333, through-hole 333 be equipped with two and with plate body 331 integrated into one piece, recess 332 and bellows Q34's one end seamless connection, through-hole 333 and gas-supply pipe Q35 transition fit, gas-supply pipe Q35 passes through-hole 333, recess 332 and communicates with each other with bellows Q34.

The groove 332 is arranged to connect the plate body 331 and the corrugated tube Q34, and the through hole 333 is arranged to allow the gas pipe Q35 to be inserted into the corrugated tube Q34, so that the corrugated tube Q34 and the gas storage bag d indirectly form a closed space, and gas can completely enter the corrugated tube Q34 or completely flow back to the gas storage bag d.

The working principle of the invention is as follows: the rotation shaft h5 is driven by a micro motor to rotate anticlockwise, so that the rotation shaft h5 drives the driving wheel h1 to rotate, the driving wheel h1 drives other rotating groups h matched with the driving wheel h1 to move through the transmission belt j, the driving wheel h1 rotates to drive the supporting plate h2 which is relatively static, and due to the limitation of the first connecting rod c and the second connecting rod i, the first guide wheel h6 and the second guide wheel h3 in the supporting plate h2 move towards the tail end direction of the supporting plate h2 under the guiding action of the supporting guide groove h4, so that the first guide wheel h6 generates pulling force on the first connecting rod c, the second guide wheel h3 generates pulling force on the second connecting rod i, the first connecting rod c enables the first light plate b and the third light plate f to descend, and the second connecting rod i enables the second light plate e and the fourth light plate g to ascend, namely, the first light plate b and the second light plate e displace towards each other, and the third light plate f and the fourth light plate g displace towards each other, the first light plate b and the second light plate e extrude the air storage bag d between the first light plate b and the second light plate e, the third light plate f and the fourth light plate g also extrude the air storage bag between the first light plate b and the second light plate e, the air storage bag d is pressurized and exhausted, air is conveyed into the connecting pipe Q4 through the Y-shaped pipe and enters the corrugated pipe Q34 through the air conveying pipe Q35, the piston block Q31 is pushed, the corrugated pipe Q34 extends, the inner coil strip of the measuring tape Q32 is stretched, and therefore the air storage bag d can push out transformer oil;

the rotating shaft h5 is driven by the micro motor to rotate clockwise, the first connecting rod c, the second connecting rod i, the first guide wheel h6 and the second guide wheel h3 enable the first light plate b, the second light plate e, the third light plate f and the fourth light plate g to release pressure on the air storage bag d, the air storage bag d is reset and sucked, air in the corrugated pipe Q34 is enabled to flow back, the stress of an inner winding strip of the measuring tape Q32 is reduced, and pulling force is generated on the piston block Q31 due to resetting, so that the piston block Q31 can translate towards the direction of the connecting pipe Q4, and therefore transformer oil can enter the heat dissipation pipe body Q2 to be stored and dissipated.

In summary, the technical progress obtained by the invention compared with the prior art is as follows: the radiating pipe communicated with the oil tank is additionally arranged outside the oil tank, so that the transformer oil can be radiated in the radiating pipe, the direct contact between the transformer oil and the radiating pipe is realized, the radiating of the transformer oil is facilitated, the radiating pipe bodies are arranged in a size sequence by adopting U-shaped radiating fins with different specifications to form a wavy shape, the circulation of air is facilitated, the radiating efficiency can be further improved, the radiating pipe is internally and additionally provided with components such as a piston block, a tape measure, a corrugated pipe and the like, the radiated transformer oil can be pushed into the oil tank, the oil heat can be reduced, the rapid radiating of the transformer oil can be realized, the transformer oil can be prevented from being remained and adhered in the radiating pipe while the piston block pushes the oil, the inner wall channel of the radiating pipe body can be prevented from being reduced, the oil flux can be reduced, and the influence on the oil radiating.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an oil-immersed power transformer, its structure is including oil tank (1), heat abstractor (2), ripple type fin (3), high voltage terminal (4), low voltage terminal (5), oil pipe (6), conservator (7), support frame (8), oil tank (1) even has support frame (8), conservator (7) are equipped with on support frame (8), conservator (7) communicate with oil tank (1) through oil pipe (6), high voltage terminal (4), low voltage terminal (5) are still installed in oil tank (1), oil tank (1) side is equipped with ripple type fin (3), openly installs heat abstractor (2), its characterized in that:

the radiating device (2) comprises radiating pipes (Q) and a power connecting box (P), wherein nine radiating pipes (Q) are arranged in parallel in an equidistant mode, the radiating pipes (Q) are connected with the power connecting box (P), and the radiating pipes (Q) are communicated with the oil tank (1);

radiating tube (Q) including U type fin (Q1), radiating tube body (Q2), a flexible subassembly (Q3), connecting pipe (Q4), No. two flexible subassemblies (Q5), connecting pipe (Q4) run through in radiating tube (Q), U type fin (Q1) are fixed on radiating tube body (Q2), be equipped with a flexible subassembly (Q3), No. two flexible subassemblies (Q5) of being connected with connecting pipe (Q4) in radiating tube body (Q2), radiating tube body (Q2) communicate in oil tank (1), connecting pipe (Q4), radiating tube body (Q2) all are connected with power connection box (P).

2. An oil filled power transformer as claimed in claim 1, characterised in that: the power connection box (P) comprises a box body (a), a first light plate (b), a first connecting rod (c), a gas storage bag (d), a second light plate (e), a third light plate (f), a fourth light plate (g), a rotating group (h), a second connecting rod (i) and a transmission belt (j), wherein the first light plate (b), the second light plate (e), the third light plate (f) and the fourth light plate (g) are arranged in the box body (a), the first light plate (b) is in transmission fit with the second light plate (e), the third light plate (f) is uniformly distributed with the fourth light plate (g), four rotating groups (h) are arranged on two inner sides of the box body (a), the four rotating groups (h) on the same side are in transmission fit through the transmission belt (j), one end of each rotating group (h) is connected with the first connecting rod (c), the other end of the connecting rod is connected with a second connecting rod (i), the first connecting rod (c) is connected with a first light plate (b) and a third light plate (f), the second connecting rod (i) is connected with a second light plate (e) and a fourth light plate (g), two longitudinally adjacent gas storage bags (d) are communicated with a connecting pipe (Q4) through a Y-shaped pipe, and the box body (a) is connected with a heat radiation pipe body (Q2).

3. An oil filled power transformer as claimed in claim 2, characterised in that: the rotating group (h) comprises a driving wheel (h1), a supporting plate (h2), a second guide wheel (h3), a supporting guide groove (h4), a rotating shaft (h5) and a first guide wheel (h6), the supporting plate (h2) is fixedly provided with the driving wheel (h1), the driving wheel (h1) is connected to the box body (a) through a rotating shaft (h5), the supporting guide groove (h4) is formed in the supporting plate (h2), the supporting guide groove (h4) is matched with the first guide wheel (h6) and the second guide wheel (h3), the second guide wheel (h3) is connected with the second connecting rod (i), the first guide wheel (h6) is connected with the first connecting rod (c), and the driving wheel (h1) is matched with the driving belt (j).

4. An oil filled power transformer as claimed in claim 1, characterised in that: the first telescopic assembly (Q3) comprises a piston block (Q31), two measuring tapes (Q32), a fixing plate (Q33), a corrugated pipe (Q34) and an air conveying pipe (Q35), wherein the number of the air conveying pipes (Q35) is two, the measuring tape (Q32) is arranged between the two air conveying pipes (Q35), the shell of the measuring tape (Q32) is connected with the air conveying pipe (Q35), one end of the air conveying pipe (Q35) penetrates through the fixing plate (Q33), the other end of the air conveying pipe (Q35) is communicated with a connecting pipe (Q4), one end of the corrugated pipe (Q34) is connected with the fixing plate (Q33), the other end of the corrugated pipe is connected with the piston block (Q31), the piston block (Q31) is matched with a heat dissipation pipe body (Q2), the heat dissipation pipe body (Q2) is connected with the fixing plate (Q33), and an inner winding strip of the measuring tape (Q32) penetrates through the corrugated pipe (Q34).

5. An oil filled power transformer as claimed in claim 4, characterised in that: fixed plate (Q33) is including plate body (331), recess (332), through-hole (333), plate body (331) is equipped with recess (332), through-hole (333) are equipped with two, recess (332) are connected with bellows (Q34), through-hole (333) and gas-supply pipe (Q35) cooperation, gas-supply pipe (Q35) pass through-hole (333), recess (332) and bellows (Q34) communicate with each other.