Oil-immersed transformer with rapid cooling

Abstract

The present invention belongs to the technical field of transformer equipment, and specifically relates to an oil-immersed transformer with rapid cooling, comprising a transformer body, on which an oil pillow is installed; a heat sink is installed on the side of the transformer body, an extension plate is slidably installed on the surface of the heat sink, and the end of the extension plate close to the transformer body is connected to the heat sink through a deformation plate; an air guide is installed on the side of the transformer body, a through hole is opened on the side of the air guide facing the heat sink, and a guide plate is installed in the air guide; the present invention has a simple structure, and when the temperature rises, the extension plate automatically unfolds to increase the heat dissipation area and heat dissipation effect of the heat sink, and the movement of the extension plate is used to clean dust on the surface of the heat sink. At the same time, the air guide is used to guide and promote air to enter the gap between the heat sinks, thereby improving air fluidity, promoting heat dissipation, and ensuring the cooling effect of the transformer.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of transformer equipment, and particularly relates to an oil-immersed transformer with rapid cooling. BACKGROUND

[0002] The oil-immersed transformer is a new high-performance transformer with more reasonable structure and better performance, and the three-dimensional winding core is arranged in a three-edged triangular shape, the magnetic circuit is free of air gap, the winding is more compact, the lengths of the three magnetic circuits are consistent and the shortest, and the cross-sectional area of the core column is closer to a circle, so that the performance is further improved, the loss is reduced, the noise is reduced, the three items are balanced, and the third harmonic component is reduced, and the product is more suitable for power grid transformation in cities and towns, industrial and mining enterprises, and is more suitable for combined transformers and pre-installed transformer substations.

[0003] The oil-immersed transformer generates a lot of heat during operation, especially in hot weather, and the temperature outside is high, and the oil-immersed transformer only relies on the surface heat dissipation fin for heat dissipation, the heat exchange efficiency is low, the heat dissipation effect is not ideal, and the oil-immersed transformer is prone to overheating, reducing the withstand voltage and insulation strength of the insulation material, and eventually leading to oil-immersed transformer failure. SUMMARY

[0004] In order to make up for the shortcomings of the prior art, when the temperature rises, the expansion plate automatically expands, the heat dissipation area and heat dissipation effect of the heat dissipation fin are increased, and the dust on the surface of the heat dissipation fin is cleaned by the movement of the expansion plate, at the same time, air is guided and promoted into the gap between the heat dissipation fins by the air guide cylinder, air flowability is improved, heat dissipation is promoted, and the cooling effect of the transformer is ensured, and the application provides an oil-immersed transformer with rapid cooling.

[0005] The technical scheme adopted by the application to solve the technical problem is that the oil-immersed transformer with rapid cooling comprises a transformer body, an oil pillow is installed on the transformer body, the oil pillow is communicated to the transformer body through an oil pipe, and an oil pump is installed in the transformer body.

[0006] A heat dissipation plate is installed on the side surface of the transformer body.

[0007] An installation groove is formed in the surface of the heat dissipation plate, an expansion plate is installed in the installation groove, a deformation plate made of a bimetallic sheet is installed on the heat dissipation plate, one end of the deformation plate and the expansion plate close to the transformer body is connected to each other, and the expansion plate moves in a direction perpendicular to the side surface of the transformer body.

[0008] The side of the transformer body is provided with air guide tubes, which are symmetrically arranged at the upper and lower ends of the heat dissipation plate, and the side of the air guide tube is provided with a through hole, and the air guide tube is provided with a guide piece.

[0009] Preferably, the expansion plate is composed of unit pieces arranged in an array, and there is a gap between adjacent unit pieces in the expansion plate.

[0010] The expansion plates on adjacent heat dissipation plates are distributed in a staggered manner.

[0011] Preferably, the expansion plate is made of a uniform heat plate.

[0012] Preferably, the expansion plate is provided with a first fixing block, the first fixing block is provided with a movable elastic wire, the movable elastic wire is in close contact with the surface of the heat dissipation plate, and the movable elastic wire is located at one end of the expansion plate close to the transformer body.

[0013] The second fixing block is installed on the heat dissipation plate, and the fixed elastic wire is installed on the second fixing block, the fixed elastic wire is in close contact with the surface of the expansion plate, and the fixed elastic wire is located at one end of the installation groove away from the transformer body.

[0014] Preferably, the guide piece in the air guide tube is installed obliquely, and the guide piece corresponds to the through hole one by one, and the guide piece divides the opening of the through hole into two equal parts.

[0015] There is a gap between the air guide tube and the upper end of the heat dissipation plate, and a gap between the air guide tube and the lower end of the heat dissipation plate.

[0016] Preferably, the inclined direction of the guide piece in the air guide tube above the heat dissipation plate is opposite to that of the guide piece in the air guide tube below the heat dissipation plate.

[0017] The opening of the air guide tube at both ends is provided with a flared plate in the shape of a horn.

[0018] Preferably, the transformer body is provided with a heat pipe, and the heat pipe is made of plastic material.

[0019] The inside of the heat dissipation plate is a hollow structure, the hollow structure is provided as a cavity, the cavity is filled with insulating oil, one end of the heat pipe is inserted into the cavity, and the other end of the heat pipe is located in the space in the transformer body.

[0020] Preferably, the heat pipe is provided with a mounting ring, the mounting ring is provided with an elastic piece, the elastic piece is arranged obliquely relative to the heat pipe, and the end of the elastic piece away from the heat pipe is embedded with a magnetic sensing piece.

[0021] The elastic piece is installed on one end of the heat pipe located in the transformer body.

[0022] The beneficial effects of the present application are as follows:

[0023] 1. The oil-immersed transformer of the present application, by setting the heat dissipation plate, cavity, heat pipe, deformation sheet, expansion plate and air guide cylinder, when the temperature rises, the deformation sheet deforms to drive the expansion plate to extend and unfold, so as to automatically adjust the heat dissipation area of the heat dissipation plate, ensure the heat dissipation effect and the cooling effect of the transformer, at the same time, the installed heat pipe accelerates the heat transfer between the transformer body and the heat dissipation plate, and ensures the uniform temperature of the insulating oil inside the heat dissipation plate and the transformer body, further improves the heat dissipation and cooling effect, at the same time, the air guide cylinder guides the entering air flow, promotes the air to enter and pass through the gap between the heat dissipation plates, improves the air flow in the gap between the heat dissipation plates, and improves the heat dissipation effect of the heat dissipation plate.

[0024] 2. The oil-immersed transformer of the present application, by setting the heat pipe, mounting ring, elastic sheet and magnetic sensing sheet, the leakage magnetic flux dissipated by the coil in the transformer body generates induced current and induced magnetic field in the magnetic sensing sheet, thereby driving the magnetic sensing sheet and the elastic sheet to swing, fluctuate or vibrate, promoting the flow of insulating oil near the heat pipe, thereby improving the heat exchange effect between the heat pipe and the insulating oil in the transformer body, facilitating the heat dissipation and cooling of the transformer.

[0025] 3. The oil-immersed transformer of the present application, by setting the movable elastic wire, fixed elastic wire, heat dissipation plate and expansion plate, the expansion plate moves to drive the movable elastic wire to move, the movable elastic wire is used to clean the dust attached to the surface of the heat dissipation plate, at the same time, when the expansion plate moves, the fixed elastic wire also scratches the surface to clean and remove the dust attached to the surface of the expansion plate. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in conjunction with the drawings.

[0027] Figure 1 is a perspective view of the oil-immersed transformer of the present application; wherein the flared plate at the opening of the air guide cylinder is omitted;

[0028] Figure 2 is a structural schematic view of the oil-immersed transformer of the present application; wherein the flared plate at the opening of the air guide cylinder is omitted;

[0029] Figure 3 is a structural schematic view of the heat dissipation plate in the oil-immersed transformer of the present application;

[0030] Figure 4 is a structural schematic view of the expansion plate in the oil-immersed transformer of the present application;

[0031] Figure 5It is the structural schematic view of the air guide cylinder in the oil-immersed transformer of the present application; wherein, the flared plate at the opening of the air guide cylinder is omitted;

[0032] Figure 6 It is the structural schematic view of the heat pipe and elastic sheet in the oil-immersed transformer of the present application;

[0033] Figure 7 It is Figure 3 the local enlarged view at A in the middle;

[0034] Figure 8 It is Figure 3 the local enlarged view at B in the middle;

[0035] Figure 9 It is Figure 6 the local enlarged view at C in the middle;

[0036] Figure 10 It is the upper surface and terminal post schematic view of the oil-immersed transformer of the present application;

[0037] In the figure: transformer body 1, heat dissipation plate 2, heat pipe 21, cavity 22, elastic sheet 23, mounting ring 231, magnetic sensing sheet 232, oil pillow 3, oil pipe 31, oil pump 32, air guide cylinder 4, through hole 41, guide sheet 42, expansion plate 5, deformation sheet 51, unit sheet 52, movable elastic wire 6, fixed elastic wire 61, first fixing block 62, second fixing block 63. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0039] As Figures 1 to 10 shown, the oil-immersed transformer with rapid cooling according to the present application comprises a transformer body 1, wherein an oil pillow 3 is installed on the transformer body 1, the oil pillow 3 is connected to the transformer body 1 through an oil pipe 31, and an oil pump 32 is installed in the transformer body 1;

[0040] A heat dissipation plate 2 is installed on the side surface of the transformer body 1;

[0041] An installation groove is formed on the surface of the heat dissipation plate 2, an expansion plate 5 is installed in the installation groove, a deformation sheet 51 made of bimetallic sheet is installed on the heat dissipation plate 2, the deformation sheet 51 and the expansion plate 5 are connected to each other at the end close to the transformer body 1, and the expansion plate 5 moves along the direction perpendicular to the side surface of the transformer body 1;

[0042] The side of the transformer body 1 is provided with air guide tubes 4, which are symmetrically arranged at the upper and lower ends of the heat dissipation plate 2, and the air guide tubes 4 are provided with through holes 41 on the side of the heat dissipation plate 2, and the air guide tubes 4 are provided with guide vanes 42, and the area of the guide vanes 42 is smaller than the cross-sectional area of the air guide tubes 4;

[0043] The transformer body 1 is filled with insulating oil, so that the coil installed in the transformer body 1 is immersed in the insulating oil, and the heat dissipation plate 2 installed outside the transformer body 1 is matched to accelerate heat dissipation and improve the insulation and cooling effect;

[0044] Meanwhile, the transformer body 1 and the oil pillow 3 are connected through the oil pipe 31, and the insulating oil is also stored in the oil pillow 3, and then the oil pump 32 installed in the transformer body 1 is matched to make the insulating oil circulate between the transformer body 1 and the oil pillow 3, and the temperature of the insulating oil is dissipated to the outside through the oil pillow 3, so as to reduce the temperature of the insulating oil, and at the same time, the oil pillow 3 is relatively isolated and far away from the transformer body 1, so that the temperature of the oil pillow 3 is relatively low and the temperature of the oil pillow 3 is easily blown by the wind to reduce the temperature, thereby facilitating the dissipation of heat in the insulating oil and reducing the temperature of the transformer, and at the same time, through the circulation of the insulating oil between the oil pillow 3 and the transformer body 1, the flowability of the insulating oil in the transformer body 1 is improved, the heat conduction effect of the insulating oil is improved, and the poor flowability of the insulating oil causes local heat accumulation, thereby causing the transformer to malfunction or the insulating oil to deteriorate due to long-term high temperature;

[0045] When the transformer works, the heat generated by the coil is transmitted to the transformer body 1 through the insulating oil, and then dissipated through the heat dissipation plate 2, so as to reduce the temperature of the transformer and avoid malfunction due to high temperature;

[0046] At the same time, when the temperature of the transformer rises, the temperature of the deformed sheet 51 made of bimetallic sheet also gradually rises, so that the deformed sheet 51 starts to deform, and the deformed sheet 51 starts to push the expansion plate 5 to slide out of the mounting slot, that is, the expansion plate 5 gradually expands from the mounting slot, thereby increasing the contact area of the heat dissipation plate 2 with air and accelerating the heat dissipation speed, improving the heat dissipation and cooling effect, thereby rapidly reducing the temperature of the transformer, and similarly, when the temperature of the transformer decreases to the normal temperature, the expansion plate 5 will be retracted into the mounting slot, so that the area of the expansion plate 5 is automatically adjusted according to the temperature of the transformer, and the contact area of the heat dissipation plate 2 with air is automatically adjusted, so as to ensure good heat dissipation effect of the transformer, and at the same time, the heat dissipation plate 2 in the initial state is relatively short, so as to avoid damage to the heat dissipation plate 2 by external force during the production, transportation and installation of the transformer, thereby affecting the normal use of the transformer;

[0047] Meanwhile, since the array of heat dissipation plates 2 is installed on the side of the transformer body 1, when the external air blows against the heat dissipation plates 2 to dissipate heat, the air blowing effect is poor and the air flow is relatively low at the position in the middle of the array of heat dissipation plates 2, which affects the heat dissipation effect of the heat dissipation plates 2. Therefore, the air guide cylinder 4 is installed on the side of the transformer body 1, and when the external air blows against the array of heat dissipation plates 2, the air also blows into the air guide cylinder 4 from the openings at both ends of the air guide cylinder 4. Then, the blowing air is intercepted and guided by the guide fins 42 in the air guide cylinder 4 and blows out from the through holes 41 into the gaps between the array of heat dissipation plates 2, thereby accelerating the air flow in the gaps between the heat dissipation plates 2 and avoiding the situation that the air blows against the heat dissipation plates 2 horizontally and cannot smoothly pass through the gaps between the heat dissipation plates 2, which affects the heat dissipation effect of the heat dissipation plates 2.

[0048] Meanwhile, the air that blows against the transformer and the heat dissipation plates 2 from the outside is guided by the installed air guide cylinder 4, and additional equipment such as a fan is not needed or is reduced to blow air, so that the gaps between the heat dissipation plates 2 can be blown by air, the air flow in the gaps between the heat dissipation plates 2 is accelerated, and the heat dissipation effect is improved.

[0049] As an embodiment of the present application, the extension plate 5 is composed of an array of unit pieces 52, and there is a gap between adjacent unit pieces 52 in the extension plate 5.

[0050] The adjacent extension plates 5 on the heat dissipation plates 2 are distributed in a staggered manner.

[0051] After the extension plate 5 extends out of the installation slot, the contact area of the heat dissipation plate 2 with air is increased, the heat dissipation effect of the heat dissipation plate 2 is improved, and the cooling effect of the transformer is improved. Meanwhile, after the extension plate 5 extends and expands, the heat dissipation plate 2 changes from a short state to a relatively elongated state, and in order to ensure the heat dissipation effect and reduce the installation and manufacturing difficulty, the thickness of the extension plate 5 is smaller than the thickness of the heat dissipation plate 2, which further reduces the structural strength of the heat dissipation plate 2 after the extension plate 5 extends and expands, and the extension plate 5 on the heat dissipation plate 2 is easily deformed and damaged by external strong wind or other external forces, which affects the normal heat dissipation of the transformer and further affects the stable operation of the transformer. Therefore, the extension plate 5 is composed of multiple unit pieces 52, the two ends of the unit piece 52 are respectively installed on the connecting plate, and the strength of the connecting plate is relatively large, so that the structural strength of the composed extension plate 5 is relatively large, the possibility of deformation of the extension plate 5 is reduced, and at the same time, a rectangular hole is formed in the extension plate 5. When the external strong wind blows, part of the blowing air passes through the rectangular hole, which reduces the force acting on the extension plate 5 and avoids the deformation and damage of the extension plate 5 caused by excessive external force.

[0052] Meanwhile, since the through rectangular holes exist on the extension plates 5, the extension plates 5 on the heat dissipation plates 2 are provided with multiple groups, and the extension plates 5 on the adjacent heat dissipation plates 2 are distributed in a staggered manner, the air flow near the extension plates 5 is ensured to be good, the heat dissipation effect of the extension plates 5 is accelerated, and the air flow near the extension plates 5 near the middle position is prevented from being affected when the extension plates 5 are distributed relatively densely, thereby affecting the heat dissipation effect of the extension plates 5.

[0053] As an embodiment of the present application, the extension plate 5 is made of a uniform heat plate.

[0054] Since the extension plate 5 is made of a uniform heat plate, the extension plate 5 has good heat transfer capacity, thereby accelerating the efficiency of heat transfer from the heat dissipation plate 2 to the extension plate 5 and the efficiency of heat dissipation from the heat dissipation plate 2 to the outside air, thereby accelerating the heat dissipation effect of the heat dissipation plate 2 and cooling the transformer.

[0055] Meanwhile, since the extension plate 5 is made of a uniform heat plate, the heat dissipation effect of the extension plate 5 is ensured to be good after the extension plate 5 is extended and unfolded, and the heat dissipation plate 2 is provided with multiple uniform heat plates when the extension plate 5 is not extended and unfolded, i.e., the heat dissipation plate 2 is provided with multiple uniform heat plates, so that the heat on the heat dissipation plate 2 is uniformly distributed and the heat transfer rate on the heat dissipation plate 2 is accelerated, thereby improving the heat dissipation effect of the heat dissipation plate 2 and the cooling effect of the transformer.

[0056] As an embodiment of the present application, the extension plate 5 is provided with a first fixing block 62, the first fixing block 62 is provided with a movable elastic wire 6, the movable elastic wire 6 is tightly attached to the surface of the heat dissipation plate 2, and the movable elastic wire 6 is located at one end of the extension plate 5 near the transformer body 1.

[0057] The heat dissipation plate 2 is provided with a second fixing block 63, the second fixing block 63 is provided with a fixed elastic wire 61, the fixed elastic wire 61 is tightly attached to the surface of the extension plate 5, and the fixed elastic wire 61 is located at one end of the installation groove away from the transformer body 1.

[0058] Since the heat sinks 2 are distributed in an array on the transformer body 1, dust is easily attached to the surface of the heat sink 2 after the transformer has been running for a long time, affecting the heat dissipation effect of the heat sink 2. At the same time, when the temperature of the transformer rises, the deformable sheet 51 will be deformed by the heat, driving the extension plate 5 to extend and expand in the installation groove. Therefore, a movable elastic wire 6 is installed on the extension plate 5 through the first fixing block 62, so that the movable elastic wire 6 is tightly attached to the surface of the heat sink 2. When the extension plate 5 moves, the movable elastic wire 6 is synchronously driven to move along the surface of the heat sink 2, scraping and cleaning the surface of the heat sink 2, avoiding or reducing the dust attached to the surface of the heat sink 2, and avoiding the attached dust causing the heat dissipation effect of the heat sink 2 to be reduced. At the same time, a fixed elastic wire is installed on the heat sink 2 through the second fixing block 63. The wire 61 is used to make the fixed elastic wire 61 tightly adhere to the surface of the expansion board 5. When the expansion board 5 is extended and unfolded, the surface of the expansion board 5 will be scraped by the fixed elastic wire 61, so that the surface of the expansion board 5 is cleaned by the fixed elastic wire 61 to prevent excessive dust from adhering to the surface of the expansion board 5 and affecting the heat dissipation effect of the expansion board 5. At the same time, since the fixed elastic wire 61 is located at the end of the mounting slot away from the transformer body 1, the fixed elastic wire 61 will have a limiting and fixing effect on the expansion board 5, so that the expansion board 5 is always tightly adhered to the bottom surface of the mounting slot, avoiding the contact area between the expansion board 5 and the mounting slot being reduced after the expansion board 5 is extended and unfolded, so that the expansion board 5 is separated from the mounting slot and cannot be tightly adhered to each other after being affected by external forces, thereby affecting the heat dissipation effect of the heat sink 2.

[0059] As an embodiment of the present invention, the guide piece 42 in the air guide cylinder 4 is installed at an angle, and the guide piece 42 corresponds to the through hole 41 one by one. The guide piece 42 divides the opening of the through hole 41 into two equal parts.

[0060] There is a gap between the air guide cylinder 4 and the upper end of the heat dissipation plate 2, and between the air guide cylinder 4 and the lower end of the heat dissipation plate 2;

[0061] The guide piece 42 installed at an angle improves the effect of guiding and directing the air entering the air guide cylinder 4, ensuring that the air passes through the gaps between the heat sinks 2 smoothly and quickly, improving the air fluidity in the gaps between the heat sinks 2, and achieving a good heat dissipation effect of the heat sink 2. At the same time, since the air guide cylinder 4 is installed on the side of the transformer body 1, the air guided and directed by the air guide cylinder 4 will flow in the gaps between the heat sinks 2 along the position close to the surface of the transformer body 1, thereby quickly and smoothly taking away the higher temperature air in the gaps between the heat sinks 2 near the transformer body 1, facilitating the heat dissipation of the heat sink 2 and the transfer of heat from the transformer body 1, thereby improving the cooling effect of the transformer;

[0062] Meanwhile, there is a gap between the air guide cylinder 4 and the end of the heat dissipation plate 2, and when the air flowability of the outside is relatively small, i.e. in a breeze or no wind, the air in the gap between the heat dissipation plates 2 rises upward when heated and expanded, and the air in the gap between the air guide cylinder 4 and the end of the heat dissipation plate 2 is dissipated, ensuring the normal air flowability in the gap between the heat dissipation plates 2 in a breeze or no wind, avoiding the installation of the air guide cylinder 4 tightly attached to the end of the heat dissipation plate 2 on the side of the transformer body 1, which causes the air to be blocked by the air guide cylinder 4 or to enter the air guide cylinder 4 when the air rises upward when heated and expanded, affecting the diffusion of the air in the environment, and further affecting the flow of the air in the gap between the heat dissipation plates 2, so that the heat dissipation effect of the heat dissipation plate 2 is affected.

[0063] As an embodiment of the present application, the inclined direction of the guide piece 42 in the air guide cylinder 4 above and below the heat dissipation plate 2 is opposite;

[0064] The air guide cylinder 4 is provided with a flared plate in the shape of a horn at the opening of both ends;

[0065] By installing the flared plate at the opening of both ends of the air guide cylinder 4, it is convenient for the outside air to enter the air guide cylinder 4, thereby promoting the flow of air in the gap between the heat dissipation plates 2, improving the heat dissipation effect of the heat dissipation plate 2 and the cooling effect on the transformer;

[0066] Meanwhile, since the flow direction of the air in the outside environment is not fixed and can change randomly, the inclined direction of the guide piece 42 in the air guide cylinder 4 above and below the heat dissipation plate 2 is opposite, so that the air entering the air guide cylinder 4 can be guided and directed when the flow direction of the air changes, ensuring that the air enters and passes through the heat dissipation plate 2 quickly and smoothly, thereby improving the air flowability in the gap between the heat dissipation plates 2, improving the heat dissipation effect of the heat dissipation plate 2 and ensuring good cooling effect on the transformer.

[0067] As an embodiment of the present application, the transformer body 1 is provided with a heat pipe 21, and the heat pipe 21 is made of plastic material;

[0068] The inside of the heat dissipation plate 2 is a hollow structure, and the hollow structure is provided as a cavity 22, the cavity 22 is filled with insulating oil, one end of the heat pipe 21 is inserted into the cavity 22, and the other end of the heat pipe 21 is located in the space in the transformer body 1;

[0069] The heat pipe 21 is installed to accelerate heat exchange between the transformer body 1 and the heat dissipation plate 2, avoid small contact area between the heat dissipation plate 2 and the transformer body 1 and welding thermal resistance, affect heat transfer from the transformer body 1 to the heat dissipation plate 2 and heat dissipation of the heat dissipation plate 2, meanwhile, the cavity 22 is formed in the heat dissipation plate 2 and the insulating oil is filled in the cavity 22, so that the heat pipe 21 is inserted into the heat dissipation plate 2 and the insulating oil in the cavity 22 is contacted and heat exchanged, so that the heat transferred by the heat pipe 21 is quickly and uniformly transferred to the heat dissipation plate 2, and then the heat is dissipated through the heat dissipation plate 2, so that the cooling effect of the transformer is ensured.

[0070] Meanwhile, the heat dissipation plate 2 is arrayed on the side of the transformer body 1, and the two ends of the heat pipe 21 are located in the transformer body 1 and the heat dissipation plate 2 respectively, so that the heat pipe 21 conducts and balances the heat of the insulating oil in the transformer body 1, and the temperature of the insulating oil in the transformer body 1 is as uniform as possible, so that the local temperature is not too high, the safe and stable operation of the transformer is affected, and the insulating oil is deteriorated.

[0071] As an embodiment of the present application, the heat pipe 21 is provided with a mounting ring 231, the mounting ring 231 is provided with an elastic sheet 23, the elastic sheet 23 is inclined to the heat pipe 21, and the end of the elastic sheet 23 away from the heat pipe 21 is embedded with a magnetic sensing sheet 232.

[0072] The elastic sheet 23 is mounted on the end of the heat pipe 21 in the transformer body 1.

[0073] During normal operation of the transformer, the coil in the transformer body 1 generates an alternating magnetic field, and then the voltage is transformed through electromagnetic induction principle, in this process, the leakage magnetic loss of the transformer is reduced through the combination of the precisely designed iron core and the coil, but it cannot be completely prevented, so that the leakage magnetic flux exists near the coil in the transformer body 1, at this time, the existing leakage magnetic flux generates induced current and induced magnetic field in the magnetic sensing sheet 232 made of silicon steel material on the elastic sheet 23, then the interaction between the induced magnetic field and the leakage magnetic flux drives the magnetic sensing sheet 232 to vibrate and fluctuate, and then drives the elastic sheet 23 to swing and fluctuate, the movement of the elastic sheet 23 promotes the flow of the insulating oil near the heat pipe 21, so as to accelerate the heat exchange between the heat pipe 21 and the insulating oil, facilitate the heat transfer of the transformer body 1, and improve the cooling effect of the transformer.

[0074] The magnetic sensing sheet 232 is embedded in the end of the elastic sheet 23 away from the heat pipe 21 by injection molding, so as to avoid the magnetic sensing sheet 232 from falling off and contacting the coil, and cause the transformer to malfunction.

[0075] The specific working process is as follows:

[0076] The transformer body 1 is connected with the oil reservoir 3 through the oil pipe 31, and the insulating oil is also stored in the oil reservoir 3, and then the oil pump 32 installed in the transformer body 1 is matched to make the insulating oil circulate between the transformer body 1 and the oil reservoir 3;

[0077] When the transformer works, the heat generated by the coil is transmitted to the transformer body 1 through the insulating oil, and then is dissipated through the heat dissipation plate 2;

[0078] When the temperature of the transformer rises, the temperature of the deformed sheet 51 made of bimetallic sheet also gradually rises, so that the deformed sheet 51 starts to deform, so that the deformed sheet 51 starts to push the expansion plate 5 to slide out of the mounting groove, that is, the expansion plate 5 gradually expands from the mounting groove. Similarly, when the temperature of the transformer decreases to the normal temperature, the expansion plate 5 will be retracted into the mounting groove, so as to automatically adjust the area of the expansion plate 5 to expand, so that the contact area of the heat dissipation plate 2 with air is automatically adjusted;

[0079] The air guide cylinder 4 is installed on the side of the transformer body 1, when the outside air blows the array distributed heat dissipation plate 2, the air will also blow into the opening at both ends of the air guide cylinder 4, then the air is intercepted and guided by the guide sheet 42 in the air guide cylinder 4, so that the air blows out from the through hole 41 and enters the gap between the array distributed heat dissipation plate 2, so as to accelerate the air flow in the gap between the heat dissipation plate 2;

[0080] The expansion plate 5 is composed of a plurality of unit sheets 52, the two ends of the unit sheet 52 are respectively installed on the connecting plate, and the strength of the connecting plate is relatively large, so that the structural strength of the expansion plate 5 composed of the unit sheet 52 is relatively large, the possibility of deformation of the expansion plate 5 is reduced, and at the same time, the rectangular hole exists on the expansion plate 5, when the expansion plate 5 is stretched and expanded, and the outside air blows, part of the air blown from the rectangular hole, that is, the force acting on the expansion plate 5 is reduced;

[0081] At the same time, since the rectangular hole exists on the expansion plate 5, the expansion plate 5 on the heat dissipation plate 2 is provided with a plurality of groups, and the expansion plate 5 on the adjacent heat dissipation plate 2 is distributed in a staggered manner, so that the expansion plate 5 stretched and expanded will not be blocked by each other, and the air flow near the expansion plate 5 is ensured to be good;

[0082] Since the expansion plate 5 is made of a uniform heating plate, the expansion plate 5 has good heat transfer capacity, so as to accelerate the efficiency of heat transfer from the heat dissipation plate 2 to the expansion plate 5, and accelerate the efficiency of heat dissipation from the heat dissipation plate 2 to the outside air;

[0083] Meanwhile, since the extension plate 5 is made of a uniform heating plate, after the extension plate 5 is extended and unfolded, the extension plate 5 can ensure good heat dissipation effect, and meanwhile, when the extension plate 5 is not extended and unfolded, the extension plate 5 is installed in the installation groove, that is, the surface of the heat dissipation plate 2 is attached to a plurality of uniform heating plates, so that the heat on the heat dissipation plate 2 is evenly distributed and the heat transfer rate on the heat dissipation plate 2 is accelerated;

[0084] By installing the movable elastic wire 6 on the extension plate 5 through the first fixing block 62, the movable elastic wire 6 is tightly attached to the surface of the heat dissipation plate 2, and when the extension plate 5 moves, the movable elastic wire 6 will move along the surface of the heat dissipation plate 2, thereby scraping and cleaning the surface of the heat dissipation plate 2, so as to avoid or reduce the dust attached to the surface of the heat dissipation plate 2. Meanwhile, by installing the fixed elastic wire 61 on the heat dissipation plate 2 through the second fixing block 63, the fixed elastic wire 61 is tightly attached to the surface of the extension plate 5, and when the extension plate 5 is extended and unfolded, the surface of the extension plate 5 will be scraped with the fixed elastic wire 61, thereby cleaning the surface of the extension plate 5 by using the fixed elastic wire 61, so as to avoid too much dust from being attached to the surface of the extension plate 5. Meanwhile, since the fixed elastic wire 61 is located at the end of the installation groove away from the transformer body 1, the fixed elastic wire 61 can limit and fix the extension plate 5, so that the extension plate 5 is always tightly attached to the bottom surface of the installation groove;

[0085] By installing the guide piece 42 at an inclination, the effect of guiding and directing the air entering the air guide cylinder 4 is improved, so as to ensure that the air can smoothly and quickly pass through the gap between the heat dissipation plates 2, and improve the air flow in the gap between the heat dissipation plates 2. Meanwhile, since the air guide cylinder 4 is installed on the side surface of the transformer body 1, the air guided and directed by the air guide cylinder 4 will flow along the position close to the surface of the transformer body 1 in the gap between the heat dissipation plates 2, thereby quickly and smoothly taking away the air with high temperature in the gap between the heat dissipation plates 2 close to the transformer body 1;

[0086] Meanwhile, there is a gap between the air guide cylinder 4 and the end of the heat dissipation plate 2. When the air flow in the outside environment is relatively small, that is, in a slight wind or no wind, the air in the gap between the heat dissipation plates 2 will rise when it is heated and expanded, and this part of air will escape from the gap between the air guide cylinder 4 and the end of the heat dissipation plate 2, so as to ensure that the air flow in the gap between the heat dissipation plates 2 is normal in a slight wind or no wind. If the air guide cylinder 4 is tightly attached to the end of the heat dissipation plate 2 and installed on the side surface of the transformer body 1, the air will be blocked by the air guide cylinder 4 or enter the air guide cylinder 4 when it is heated and expanded to rise, which will affect the diffusion of this part of air in the environment;

[0087] By installing the flared plate at the openings at both ends of the air guide cylinder 4, it is convenient for the outside air to enter the air guide cylinder 4;

[0088] The air entering the air guide cylinder 4 is guided and directed when the air flow direction changes, and the air can enter and pass through the heat dissipation plates 2 quickly and smoothly.

[0089] The heat pipe 21 is installed to accelerate the heat exchange between the transformer body 1 and the heat dissipation plates 2, and the cavity 22 is formed in the heat dissipation plates 2 and filled with insulating oil, so that the heat pipe 21 is inserted into the heat dissipation plates 2 and contacts and transfers heat through the insulating oil in the cavity 22, ensuring that the heat transferred by the heat pipe 21 can be quickly and uniformly transferred to the heat dissipation plates 2.

[0090] Meanwhile, the heat dissipation plates 2 are arrayed on the side of the transformer body 1, and the two ends of the heat pipe 21 are located in the transformer body 1 and the heat dissipation plates 2, respectively, so that the heat pipe 21 conducts and balances the heat of the insulating oil in the transformer body 1, and the temperature of the insulating oil in the transformer body 1 is as uniform as possible.

[0091] When the transformer is running normally, the magnetic flux leakage existing in the transformer body 1 will generate an induced current and an induced magnetic field in the magnetic sensing sheet 232 made of silicon steel material on the elastic sheet 23, and then the induced magnetic field and the magnetic flux leakage will interact with each other, causing the magnetic sensing sheet 232 to vibrate and fluctuate, and then causing the elastic sheet 23 to swing and fluctuate, so that the movement of the elastic sheet 23 promotes the flow of the insulating oil near the heat pipe 21, thereby accelerating the heat exchange between the heat pipe 21 and the insulating oil.

[0092] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A fast cooling oil-immersed transformer, comprising a transformer body (1), an oil pillow (3) mounted on the transformer body (1), the oil pillow (3) being connected to the transformer body (1) via an oil pipe (31), and an oil pump (32) being mounted in the transformer body (1); A heat sink (2) is installed on the side of the transformer body (1); Its characteristics are: A mounting groove is provided on the surface of the heat dissipation plate (2), an expansion plate (5) is installed in the mounting groove, a deformation plate (51) made of a bimetallic sheet is installed on the heat dissipation plate (2), the deformation plate (51) and an end of the expansion plate (5) close to the transformer body (1) are connected to each other, and the expansion plate (5) moves in a direction perpendicular to the side surface of the transformer body (1); An air guide cylinder (4) is installed on the side of the transformer body (1), and the air guide cylinder (4) is symmetrically distributed at the upper and lower ends of the heat dissipation plate (2). A through hole (41) is opened on the side of the air guide cylinder (4) facing the heat dissipation plate (2). A guide plate (42) is installed in the air guide cylinder (4), and the area of ​​the guide plate (42) is smaller than the cross-sectional area of ​​the air guide cylinder (4); A first fixing block (62) is mounted on the expansion board (5), a movable elastic wire (6) is mounted on the first fixing block (62), the movable elastic wire (6) is in close contact with the surface of the heat sink (2), and the movable elastic wire (6) is located at one end of the expansion board (5) close to the transformer body (1); A second fixing block (63) is mounted on the heat dissipation plate (2), a fixing elastic wire (61) is mounted on the second fixing block (63), the fixing elastic wire (61) is in close contact with the surface of the expansion board (5), and the fixing elastic wire (61) is located at an end of the mounting slot away from the transformer body (1).

2. The oil-immersed transformer with rapid cooling according to claim 1, characterized in that: The expansion board (5) is composed of unit pieces (52) arranged in an array, and there are gaps between adjacent unit pieces (52) in the expansion board (5); The expansion plates (5) on adjacent heat dissipation plates (2) are staggered with respect to each other.

3. The oil-immersed transformer with rapid cooling according to claim 1, characterized in that: The expansion plate (5) is made of a heat spreader.

4. The oil-immersed transformer with rapid cooling according to claim 1, characterized in that: The guide piece (42) in the air guide cylinder (4) is installed at an angle, and the guide piece (42) corresponds to the through hole (41) one by one. The guide piece (42) divides the opening of the through hole (41) into two equal parts; There are gaps between the air guide cylinder (4) and the upper end of the heat dissipation plate (2), and between the air guide cylinder (4) and the lower end of the heat dissipation plate (2).

5. The oil-immersed transformer with rapid cooling according to claim 4, characterized in that: The guide plates (42) in the air guide cylinder (4) above and below the heat dissipation plate (2) are inclined in opposite directions; Trumpet-shaped expansion plates are installed at the openings at both ends of the air guide cylinder (4).

6. The oil-immersed transformer with rapid cooling according to claim 1, characterized in that: A heat pipe (21) is installed in the transformer body (1), and the heat pipe (21) is made of plastic material; The interior of the heat dissipation plate (2) is a hollow structure, which is configured as a cavity (22). The cavity (22) is filled with insulating oil. One end of the heat pipe (21) is inserted into the cavity (22), and the other end of the heat pipe (21) is located in the space inside the transformer body (1).

7. The oil-immersed transformer with rapid cooling according to claim 6, characterized in that: The heat pipe (21) is mounted with a mounting ring (231), an elastic sheet (23) is mounted on the mounting ring (231), the elastic sheet (23) is arranged obliquely relative to the heat pipe (21), and a magnetic sensing sheet (232) is embedded and mounted on one end of the elastic sheet (23) away from the heat pipe (21); The elastic sheet (23) is mounted on one end of the heat pipe (21) located inside the transformer body (1).

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