Transformer with explosion protection structure

Abstract

The application discloses a transformer with an anti-explosion protection structure, which comprises a transformer body and a gas exhaust pipe with a pressure relief valve arranged on the transformer body, and is characterized in that the transformer body is provided with a gas breathing assembly, a cooling cover assembly and an oil liquid breathing assembly, and relates to the technical field of oil-immersed transformers. The transformer with the anti-explosion protection structure is characterized in that the oil liquid breathing assembly is arranged to provide an expansion space for oil liquid, and the elastic sealing member is arranged to realize the expansion of the oil liquid under different pressure gradients, thereby improving the anti-explosion strength of the transformer body; the position of the U-shaped lap joint frame is changed to provide an intuitive display of the change of the internal pressure of the transformer body; and the four trigger switches are arranged to control the blowing speed of the cooling fan when the transformer body is in different pressure environments, thereby achieving the advantages of energy saving, accelerating the cooling speed of the transformer body, relieving the gas expansion, and further improving the anti-explosion strength.

Description

Technical Field

[0001] The invention relates to the technical field of oil-immersed transformers, in particular to a transformer with an explosion-proof protection structure. Background Art

[0002] An oil-immersed transformer is a type of transformer that relies on oil as a cooling medium. The interior of an oil-immersed transformer is divided into an upper gas space and a lower transformer oil space. The transformer oil will expand or contract with temperature changes during operation. The gas space above the transformer oil is usually filled with inert gases such as nitrogen, which can enhance insulation performance and prevent arc discharge. The gas space also helps to circulate and dissipate heat in the oil, improving the cooling efficiency of the transformer. The reserved expansion space can accommodate changes in the oil volume and avoid excessive pressure. When a fault occurs inside the transformer, such as local overheating or arcing, the oil will decompose and produce gas. These gases will enter the upper gas space, increasing the pressure inside the transformer. As the temperature rises, the gas will further expand, bringing the risk of explosion.

[0003] Conventional oil-immersed transformers often require explosion-proof measures such as installing pipes with pressure relief valves. When the internal pressure of the transformer reaches a certain level, exhaust is used to relieve the pressure. However, the pressure relief speed is limited, and there is a risk that the internal pressure of the transformer will continue to increase during the pressure relief process of the pressure relief valve. If a persistent internal fault occurs inside the transformer, a simple pressure relief valve is not sufficient to cope with the continuous pressure increase. In addition, the changes in the internal pressure of the transformer lack a dynamic display, and operation and maintenance personnel cannot intuitively and effectively judge the current status of the transformer.

[0004] For example, an oil-immersed transformer with an explosion-proof protection structure as described in application number 202110643853.7 improves the explosion-proof strength of the structure by attaching a metal mesh inside, and provides an explosion-proof protection pot with a transparent structure, so that maintenance personnel can observe the amount of transformer oil in the explosion-proof protection pot during maintenance, and judge whether the oil-immersed transformer body needs maintenance based on the amount of transformer oil. Since the amount of transformer oil is accumulated multiple times, it is easy to cause misjudgment by operation and maintenance personnel in judging whether the transformer needs maintenance.

[0005] Based on the search of the above information, it can be seen that the existing oil-immersed transformers have the following defects:

[0006] 1. The explosion-proof measures are too simple to cope with the situation of continuous pressure increase;

[0007] Second, the internal pressure of the transformer lacks a dynamic and intuitive display, which is not conducive to the operation and maintenance personnel's accurate judgment on whether the transformer needs maintenance.

[0008] To this end, a transformer with an explosion-proof protection structure is proposed. When the internal pressure of the transformer continues to rise, the storage space of the transformer oil is expanded according to the pressure gradient, which can dynamically and intuitively display the internal pressure of the transformer and reduce the internal pressure of the transformer. In addition, during the expansion process, the gradient accelerates the air flow rate around the transformer body to reduce the expansion speed of the gas inside the transformer body, which has an energy-saving effect and provides sufficient pressure relief time for the pressure relief valve. Summary of the Invention

[0009] In response to the shortcomings of the existing technology, the present invention provides a transformer with an explosion-proof protection structure, which solves the problem that the existing oil-immersed transformers have a single explosion-proof measure and cannot cope with the situation of continuous pressure increase. In addition, the internal pressure of the transformer lacks dynamic and intuitive display, which is not conducive to the operation and maintenance personnel to accurately judge whether the transformer needs maintenance.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions: a transformer with an explosion-proof protection structure, comprising a transformer body and an exhaust pipe with a pressure relief valve disposed on the transformer body, a gas breathing assembly and a cooling cover assembly disposed on the top of the transformer body, the gas breathing assembly being used to isolate and cool the expanded gas in the transformer body;

[0011] An oil breathing assembly is provided at the bottom of the outer periphery of the transformer body, and the oil breathing assembly is used to provide a gradient expansion space for the transformer oil inside the transformer body.

[0012] In order to achieve cooling of the transformer body, the present invention is further configured as follows: the cooling cover assembly includes a bent sunshade, and two sets of cooling fans are fixedly installed on the bottom of the bent sunshade;

[0013] The bent sunshade is fixedly mounted on the top of the transformer body via a mounting rod, and the gas breathing component is arranged below the bent sunshade.

[0014] In order to increase the capacity of the gas space in the transformer body, the present invention is further configured as follows: the gas breathing assembly includes a container cover, a piston cylinder is fixedly installed on the top of the container cover inner cavity, a piston is slidably installed inside the piston cylinder, and a first spring is fixedly installed between the top of the piston and the top of the container cover inner cavity;

[0015] The container cover and the piston cylinder are both fixedly mounted on the top of the transformer body. The top of the transformer body is provided with a pressure hole and a plurality of air guide holes, wherein the pressure hole is communicated with the piston cylinder, and the plurality of air guide holes are communicated with the container cover.

[0016] In order to realize the rapid cooling of part of the gas in the gas space, the application is further provided with: the bottom of the piston is fixedly installed with a connecting rod, the bottom of the connecting rod passes through the pressure hole and is fixedly installed with a bracket, the top of the bracket is fixedly installed with a plurality of blocking cones, and the blocking cones are used in cooperation with the gas guide holes;

[0017] The outer periphery of the piston cylinder is provided with a plurality of through grooves, and the plurality of through grooves are used in cooperation with the piston.

[0018] In order to further improve the cooling speed of part of the gas, the application is further provided with: the outer periphery of the container cover is fixedly installed with a plurality of groups of heat conduction rings from top to bottom, and the outer periphery of the heat conduction ring is fixedly installed with a plurality of groups of heat dissipation fins.

[0019] In order to provide the transformer oil with a space for expansion, the application is further provided with: the oil breathing assembly comprises a first expansion box, a second expansion box, a third expansion box and a fourth expansion box which are sequentially communicated, the first expansion box, the second expansion box, the third expansion box and the fourth expansion box are fixedly installed on the outer periphery of the transformer body respectively, the back of the transformer body is provided with an oil guide port, the oil guide port is communicated with the first expansion box, and the first expansion box, the second expansion box, the third expansion box and the fourth expansion box are all provided with elastic blocking pieces, the four elastic blocking pieces are used to control the transformer oil in the transformer body to enter the first expansion box through the oil guide port and then enter the second expansion box, the third expansion box and the fourth expansion box in turn.

[0020] The application is further provided with: the elastic blocking piece comprises two guide rods, one end of the two guide rods is fixedly installed with a blocking sliding block, the other end of the two guide rods is fixedly installed with a U-shaped lap joint frame, and the outer periphery of the guide rod is further sleeved with a second spring.

[0021] In order to realize the gradient expansion of the transformer oil storage space according to the internal pressure of the transformer body, the application is further provided with: the blocking sliding block of the elastic blocking piece in the first expansion box is slidingly installed in the inside of the first expansion box, the two guide rods all penetrate through the first expansion box and extend above the first expansion box, and the two ends of the second spring are fixedly connected with the U-shaped lap joint frame and the side opposite to the first expansion box respectively, and the oil guide port is arranged below the blocking sliding block;

[0022] The blocking sliding block of the elastic blocking piece in the second expansion box is slidingly installed in the inside of the second expansion box, the two guide rods all penetrate through the second expansion box and extend below the second expansion box, and the two ends of the second spring are fixedly connected with the U-shaped lap joint frame and the side opposite to the second expansion box respectively, one side of the second expansion box is communicated with an oil injection head, the oil injection head is arranged above the blocking sliding block, and the bottom of the outer periphery of the transformer body is further communicated with an oil discharge head;

[0023] The blocking slider of the elastic blocking member provided in the third expansion box is slidably installed inside the third expansion box, the two guide rods both pass through the third expansion box and extend above the third expansion box, and the two ends of the second spring are respectively fixedly connected to the U-shaped bridging frame and the side opposite to the third expansion box;

[0024] The blocking slider of the elastic blocking piece provided in the fourth expansion box is slidably installed inside the fourth expansion box, the two guide rods both pass through the fourth expansion box and extend to the bottom of the fourth extension box, and the two ends of the second spring are respectively fixedly connected to the U-shaped lap frame and the side opposite to the fourth expansion box.

[0025] In order to achieve energy saving by expanding the capacity of the transformer oil storage space, the present invention is further configured as follows: a first trigger switch, a second trigger switch, a third trigger switch, and a fourth trigger switch are respectively fixedly mounted on the surfaces of the first expansion box, the second expansion box, the third expansion box, and the fourth expansion box via a connecting frame, and the first trigger switch, the second trigger switch, the third trigger switch, and the fourth trigger switch are all used in conjunction with a U-shaped bridging frame and a cooling fan.

[0026] The present invention is further configured such that the elastic strengths of the second springs provided in the first extension box, the second extension box, the third extension box and the fourth extension box increase in sequence.

[0027] A method for using a transformer with an explosion-proof protection structure comprises the following steps:

[0028] Step 1, first-level expansion: When the gas space inside the transformer body expands due to heat, the transformer oil is squeezed into the first expansion box from the oil guide port, and the blocking slider is squeezed upward. The blocking slider drives the guide rod to move upward, causing the U-shaped bridging frame to stretch the second spring. During the upward movement of the blocking slider, the first expansion box is connected with the second expansion box. When the U-shaped bridging frame contacts and squeezes the first trigger switch, the cooling fan starts, and the transformer body is cooled by blowing air at the first level.

[0029] Step 2, secondary expansion: As the gas space inside the transformer body continues to expand due to heat, the transformer oil entering the second expansion box squeezes the blocking slider downward, and the blocking slider drives the guide rod to move downward, causing the U-shaped bridging frame to stretch the second spring. During the downward movement of the blocking slider, the second expansion box is connected to the third expansion box, and when the U-shaped bridging frame contacts and squeezes the second trigger switch, the cooling fan blows at the second gear;

[0030] Step 3, three-stage expansion: As the gas space inside the transformer body continues to expand due to heat, the transformer oil entering the third expansion box presses the blocking slider upward, which drives the guide rod to move upward, causing the U-shaped bridging frame to stretch the second spring. During the upward movement of the blocking slider, the third expansion box is connected to the fourth expansion box, and when the U-shaped bridging frame contacts and squeezes the third trigger switch, the cooling fan blows at the third gear.

[0031] Step 4, four-stage expansion: As the gas space inside the transformer body continues to expand due to heat, the transformer oil entering the fourth expansion box squeezes the blocking slider downward, and the blocking slider drives the guide rod to move downward, causing the U-shaped lap frame to stretch the second spring. During the downward movement of the blocking slider, the fourth expansion box is connected to the first expansion box, and the U-shaped lap frame contacts and squeezes the fourth trigger switch. The cooling fan blows air at four gears, with the wind speeds of the first, second, third and fourth gears increasing in sequence.

[0032] The present invention provides a transformer with an explosion-proof protection structure. It has the following beneficial effects:

[0033] (1) The present invention provides expansion space for the oil by setting up an oil breathing assembly, and realizes the expansion of the oil under different pressure gradients by cooperating with the setting of an elastic sealing member, thereby improving the explosion-proof strength of the transformer body. By changing the position of the U-shaped lap joint, an intuitive display of the pressure change inside the transformer body is provided. At the same time, by cooperating with the setting of four trigger switches, the blowing speed of the cooling fan is controlled when the inside of the transformer body is in different pressure environments, which has the advantage of energy saving and accelerates the cooling speed of the transformer body to alleviate the pressure increase caused by gas expansion.

[0034] (2) The present invention realizes the expansion of the gas space by setting up the gas breathing component, improves the explosion-proof strength of the transformer body, and diversifies the explosion-proof measures of the transformer body. With the cooperation of the piston cylinder, the piston, the first spring, the connecting rod, the bracket and the blocking cone, when the pressure of the transformer body is sufficient to push the piston upward and squeeze the first spring, the blocking cone blocks the air guide hole, isolates the gas connection between the container cover and the transformer body, uses the cooling fan to cool the gas in the container cover, and the high-temperature gas in the transformer body is discharged from the exhaust pipe with the pressure relief valve, thereby improving the cooling effect. At the same time, with the cooperation of the through groove, it provides a guarantee for the balance between the gas pressure in the container cover and the gas space pressure in the transformer body, thereby ensuring the smooth reset and reuse of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the external structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the connection between the gas breathing component and the transformer body structure of the present invention;

[0037] Figure 3 Schematic diagram of the structure of the gas breathing assembly of the present invention;

[0038] Figure 4 This is a schematic structural diagram of the cooling and covering assembly of the present invention;

[0039] Figure 5 Schematic diagram of the internal structure of the transformer body of the present invention;

[0040] Figure 6 It is a schematic diagram of the connection between the oil breathing assembly and the elastic sealing member structure of the present invention;

[0041] Figure 7 It is a structural schematic diagram of the present invention, the first extension box, the second extension box, the first trigger switch, the second trigger switch and the elastic blocking member;

[0042] Figure 8 This is a schematic structural diagram of the second extension box, the third extension box, the second trigger switch, the third trigger switch, and the elastic blocking member of the present invention;

[0043] Figure 9 This is a schematic structural diagram of the third extension box, the fourth extension box, the third trigger switch, the fourth trigger switch, and the elastic blocking member of the present invention;

[0044] Figure 10 This is a schematic structural diagram of the first extension box, the fourth extension box, the first trigger switch, the fourth trigger switch, and the elastic blocking member of the present invention;

[0045] Figure 11 Schematic diagram of circuit control of four trigger switches and two cooling fans in an embodiment of the present invention.

[0046] In the picture:

[0047] 1. Transformer body; 101. Exhaust pipe with pressure relief valve; 102. Pressure hole; 103. Air guide hole; 104. Oil guide port; 105. Oil filling head; 106. Oil drain head;

[0048] 2. Gas breathing assembly; 201. Container cover; 202. Piston cylinder; 203. Piston; 204. First spring; 205. Connecting rod; 206. Bracket; 207. Blocking cone; 208. Through groove; 209. Heat conducting ring; 2010. Heat sink;

[0049] 3. Cooling cover assembly; 301. Bending sun visor; 302. Cooling fan; 303. Mounting rod;

[0050] 4. Oil breathing assembly; 401. First expansion box; 402. Second expansion box; 403. Third expansion box; 404. Fourth expansion box; 405. Connecting frame; 406. First trigger switch; 407. Second trigger switch; 408. Third trigger switch; 409. Fourth trigger switch;

[0051] 5. Elastic blocking member; 501. Guide rod; 502. Blocking slider; 503. U-shaped lap joint; 504. Second spring. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0053] See also Figure 1-11 , the embodiment of the present invention provides the following technical solutions: Example

[0054] A transformer with an explosion-proof protection structure includes a transformer body 1 and an exhaust pipe 101 with a pressure relief valve arranged on the transformer body 1, as well as a cooling cover assembly 3 and an oil breathing assembly 4. The transformer body 1 is fixedly equipped with heat dissipation fins on the periphery. The exhaust pipe 101 with a pressure relief valve is a pipe equipped with a pressure relief valve, which is used to exhaust and reduce the pressure when the internal pressure of the transformer body 1 exceeds a preset standard. The cooling cover assembly 3 includes a bent sun visor 301, and two groups of cooling fans 302 are fixedly installed at the bottom of the bent sun visor 301. The bent sun visor 301 is fixedly installed on the top of the transformer body 1 through a mounting rod 303, thereby shading the transformer body 1 from the sun and protecting it from rain, thereby providing a guarantee for the long-term stable use of the transformer body 1.

[0055] As a preferred solution, the oil breathing assembly 4 is used to provide a gradient expansion space for the transformer oil inside the transformer body 1. Specifically, the oil breathing assembly 4 includes a first expansion box 401, a second expansion box 402, a third expansion box 403 and a fourth expansion box 404 that are connected in sequence. The first expansion box 401, the second expansion box 402, the third expansion box 403 and the fourth expansion box 404 are respectively fixedly installed on the periphery of the transformer body 1. An oil guide port 104 is provided on the back of the transformer body 1. The oil guide port 104 is connected to the first expansion box 401. The setting of the oil guide port 104 provides a channel for the transformer oil to enter the first expansion box 401. In order to realize the expansion of the transformer oil in the first expansion box 401, the second expansion box 402, the third expansion box 403 and the fourth expansion box 4 04, an elastic blocking member 5 is provided in each of the first expansion box 401, the second expansion box 402, the third expansion box 403 and the fourth expansion box 404. On this basis, a gradient expansion design is carried out, wherein the elastic blocking member 5 includes two guide rods 501, one end of the two guide rods 501 is fixedly mounted with a blocking slider 502, the other end of the two guide rods 501 is fixedly mounted with a U-shaped bridging frame 503, and the outer circumference of the guide rods 501 is further sleeved with a second spring 504. By designing the second spring 504 with different elastic strengths, different pressure blocking can be achieved for the first expansion box 401, the second expansion box 402, the third expansion box 403 and the fourth expansion box 404, thereby achieving gradient pressure expansion, as follows:

[0056] The first expansion box 401 is provided with a blocking slider 502 of an elastic blocking member 5 which is slidably installed inside the first expansion box 401. The two guide rods 501 both pass through the first expansion box 401 and extend to the top of the first expansion box 401. The two ends of the second spring 504 are fixedly connected to the U-shaped bridging frame 503 and the opposite side of the first expansion box 401 respectively. The oil guide port 104 is provided below the blocking slider 502. The pressure caused by the expansion of the gas space in the transformer body 1 squeezes the transformer oil from the oil guide port 104 into the bottom of the blocking slider 502 in the first expansion box 401. After overcoming the elastic force of the second spring 504, the blocking slider 502 can be pushed upward to achieve a first-level expansion. During the process, the U-shaped bridging frame 503 moves upward to dynamically display the pressure change inside the transformer body 1.

[0057] The second extension box 402 is provided with a blocking slider 502 of an elastic blocking member 5 which is slidably mounted inside the second extension box 402. The two guide rods 501 both penetrate the second extension box 402 and extend to the bottom of the second extension box 402. The two ends of the second spring 504 are respectively fixedly connected to the U-shaped lap frame 503 and the side opposite to the second extension box 402. One side of the second extension box 402 is connected to the oil filling head 105, and the oil filling head 105 is arranged above the blocking slider 502. The outer periphery of the transformer body 1 is The bottom is also connected to the oil drain head 106. When the pressure in the transformer body 1 continues to increase, as the blocking slider 502 in the first expansion box 401 rises, the first expansion box 401 is connected with the second expansion box 402, and the transformer oil enters the upper part of the blocking slider 502 in the second expansion box 402. After overcoming the elastic force of the second spring 504, the blocking slider 502 can be pushed downward to achieve secondary capacity expansion. During this process, the U-shaped bridge frame 503 moves downward to dynamically display the pressure changes inside the transformer body 1.

[0058] The sealing slider 502 of the elastic sealing member 5 is provided in the third extension box 403 and is slidably installed in the interior of the third extension box 403. The two guide rods 501 both pass through the third extension box 403 and extend to the top of the third extension box 403, and the two ends of the second spring 504 are fixedly connected to the U-shaped bridging frame 503 and the opposite side of the third extension box 403 respectively. When the pressure in the transformer body 1 continues to increase, as the sealing slider 502 in the second extension box 402 descends, the second extension box 402 is connected with the third extension box 403, and the transformer oil enters the bottom of the sealing slider 502 in the third extension box 403. After overcoming the elastic force of the second spring 504, the sealing slider 502 can be pushed upward to achieve three-stage expansion. During the process, the U-shaped bridging frame 503 moves upward to dynamically display the pressure changes inside the transformer body 1.

[0059] The sealing slider 502 of the elastic sealing member 5 is provided in the fourth expansion box 404 and is slidably installed in the interior of the fourth expansion box 404. The two guide rods 501 pass through the fourth expansion box 404 and extend to the bottom of the fourth expansion box 404. The two ends of the second spring 504 are fixedly connected to the U-shaped bridging frame 503 and the opposite side of the fourth expansion box 404 respectively. When the pressure in the transformer body 1 continues to increase, as the sealing slider 502 in the third expansion box 403 rises, the third expansion box 403 is connected with the fourth expansion box 404, and the transformer oil enters the top of the sealing slider 502 in the fourth expansion box 404. After overcoming the elastic force of the second spring 504, the sealing slider 502 can be pushed downward to achieve four-level expansion. During the process, the U-shaped bridging frame 503 moves downward to dynamically display the pressure change inside the transformer body 1. In the process of the blocking slider 502 moving downward, the fourth expansion box 404 will also be connected with the first expansion box 401.

[0060] Further explanation: the elastic strength of the second spring 504 provided in the first expansion box 401, the second expansion box 402, the third expansion box 403 and the fourth expansion box 404 increases successively, which ensures gradient expansion while ensuring the sequential reflux of the transformer oil when the internal pressure of the transformer body 1 returns to a normal level.

[0061] As a preferred solution, in order to further improve the explosion-proof effect, a first trigger switch 406, a second trigger switch 407, a third trigger switch 408, and a fourth trigger switch 409 are fixedly installed on the surface of the first expansion box 401, the second expansion box 402, the third expansion box 403, and the fourth expansion box 404 through a connecting frame 405. The first trigger switch 406, the second trigger switch 407, the third trigger switch 408, and the fourth trigger switch 409 are all used in conjunction with the U-shaped bridging frame 503 and the cooling fan 302. Specifically:

[0062] In the first-level expansion stage, after the first trigger switch 406 is squeezed by the U-shaped bridge frame 503, the two cooling fans 302 are started to accelerate the air flow speed on the surface of the transformer body 1 at the first gear;

[0063] In the secondary expansion stage, after the second trigger switch 407 is squeezed by the U-shaped bridge frame 503, the two cooling fans 302 are started to accelerate the air flow speed on the surface of the transformer body 1 at the second gear;

[0064] In the third-level expansion stage, after the third trigger switch 408 is squeezed by the U-shaped bridge frame 503, the two cooling fans 302 are started to accelerate the air flow speed on the surface of the transformer body 1 at the third gear;

[0065] In the fourth-level expansion stage, after the fourth trigger switch 409 is squeezed by the U-shaped bridge frame 503, the two cooling fans 302 are started to accelerate the air flow rate on the surface of the transformer body 1 in four gears, with the wind speed increasing in gears 1, 2, 3 and 4 in sequence.

[0066] As an expanded explanation, the two cooling fans 302 are driven by motors and powered by an external power supply. The first trigger switch 406, the second trigger switch 407, the third trigger switch 408 and the fourth trigger switch 409 serve as switches S1, S2, S3 and S4, as shown in the attached figure. Figure 11As shown, switches S1, S2, S3 and S4 are respectively connected in series with a resistor R1, R2, R3 and R4 to form a switch module in parallel, and then the switch module is connected in series with two cooling fans 302 and an external power supply. It should be noted that the resistance values ​​of the resistors R1, R2, R3 and R4 are set to decrease in sequence. In this way, after the switch S1 is closed, the circuit forms a closed loop, the resistance of the switch module is relatively large, and the cooling fan 302 is started at the first gear. After the switch S2 is closed, the resistance of the switch module is reduced, and the cooling fan 302 is started at the second gear. After the switch S3 is closed, the resistance of the switch module is further reduced, and the cooling fan 302 is started at the third gear. After the switch S4 is closed, the resistance of the switch module is reduced again, and the cooling fan 302 is started at the fourth gear.

[0067] In this embodiment, not only can the gradient expansion of the transformer oil be achieved to improve the explosion-proof effect, but also the dynamic display of the pressure change inside the transformer body 1 can be achieved according to the position change of the four U-shaped bridging frames 503, and the step-by-step control of the speed of the two cooling fans 302 can be achieved in conjunction with the setting of the four control switches. In this way, while ensuring the cooling speed of the transformer body 1, it has a good energy-saving effect.

[0068] As a detailed explanation, for the changes of the four U-shaped joint frames 503, the first-level maintenance response, second-level maintenance response, third-level maintenance response and fourth-level maintenance response settings are performed according to the first expansion box 401, the second expansion box 402, the third expansion box 403 and the fourth expansion box 404 corresponding to their installation positions. For example, when the U-shaped joint frame 503 on the first expansion box 401 moves, it serves as a first-level maintenance response signal, wherein the first-level maintenance response, the second-level maintenance response, the third-level maintenance response and the fourth-level maintenance response correspond to increasing urgency levels. It is further explained that the corresponding levels can also be deeply divided according to the movement amplitude of the U-shaped joint frame 503 to improve the accuracy of judging the degree of urgency. Example

[0069] This embodiment is an improvement of the previous embodiment. A transformer with an explosion-proof protection structure further includes a gas breathing component 2. The gas breathing component 2 is arranged below the bent sun visor 301. The gas breathing component 2 is used to isolate and cool the expanded gas in the transformer body 1. Specifically, the gas breathing component 2 includes a container cover 201. A piston cylinder 202 is fixedly installed on the top of the inner cavity of the container cover 201. The container cover 201 and the piston cylinder 202 are both fixedly installed on the top of the transformer body 1. A pressure hole 102 and a plurality of air guide holes 103 are opened on the top of the transformer body 1, wherein the pressure hole 102 is connected to the piston cylinder 202, and the plurality of air guide holes 103 are connected to the container The cover 201 is connected, and a piston 203 is slidably installed inside the piston cylinder 202. A first spring 204 is fixedly installed between the top of the piston 203 and the top of the inner cavity of the container cover 201. The elastic strength of the first spring 204 is greater than the elastic strength of the second spring 504. A connecting rod 205 is fixedly installed at the bottom of the piston 203. The bottom of the connecting rod 205 passes through the pressure hole 102 and is fixedly installed with a bracket 206. A number of blocking cones 207 are fixedly installed on the top of the bracket 206, and the blocking cones 207 are used in conjunction with the air guide hole 103. A number of through grooves 208 are opened on the outer periphery of the piston cylinder 202, and the several through grooves 208 are all used in conjunction with the piston 203.

[0070] Furthermore, in order to improve the heat dissipation speed of the container cover 201 , several groups of heat conducting rings 209 are fixedly installed on the periphery of the container cover 201 from top to bottom, and several groups of heat sinks 2010 are fixedly installed on the periphery of the heat conducting rings 209 .

[0071] The advantage of the second embodiment over the first embodiment is that after the transformer oil completes the four-stage expansion, the internal pressure of the transformer body 1 continues to increase. When it increases to overcome the elastic force of the first spring 204 and pushes the piston cylinder 202 to rise, the piston cylinder 202 drives the connecting rod 205 to move the bracket 206 upward, and the bracket 206 drives the four blocking cones 207 to rise, insert and block the air guide hole 103. When the air pressure inside the container cover 201 is consistent with the pressure of the gas space in the transformer body 1, the upward movement of the piston 203 is blocked. During this process, the gas in the upper space of the transformer body 1 is discharged from the exhaust pipe 10 with a pressure relief valve. 1 is discharged to reduce the pressure. As the two cooling fans 302 accelerate the cooling of the air in the container cover 201, the gas pressure in the container cover 201 decreases, and the piston 203 continues to move upward. After leaking out of the through groove 208, the pressurized gas in the transformer body 1 enters the container cover 201 through the through groove 208, so that the air pressure inside the container cover 201 and the pressure of the gas space in the transformer body 1 are kept relatively balanced. During the process, while the gas space inside the transformer body 1 is expanded, part of the gas is trapped and the temperature is reduced. This improves the cooling efficiency and effectively improves the explosion-proof effect of the transformer body 1.

[0072] In summary, the present invention realizes the gradient expansion of transformer oil through a four-stage expansion method, while improving the explosion-proof effect of the transformer body 1. It also combines the gas expansion and isolation cooling methods to realize the five-fold expansion explosion-proof protection of the internal pressure of the transformer body 1, and provides sufficient pressure relief time for the exhaust pipe 101 with a pressure relief valve to cope with the occurrence of continuous internal faults.

[0073] As an expansion solution, heat dissipation fins may be added to the side of the first expansion box 401 , the second expansion box 402 , the third expansion box 403 and the fourth expansion box 404 away from the transformer body 1 to accelerate the cooling rate of the transformer oil.

[0074] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A transformer with an explosion-proof protection structure, comprising a transformer body (1) and an exhaust pipe (101) with a pressure relief valve arranged on the transformer body (1), characterized in that: A gas breathing component (2) and a cooling cover component (3) are provided on the top of the transformer body (1); the gas breathing component (2) is used to isolate and cool the expanded gas in the transformer body (1); An oil breathing assembly (4) is provided at the bottom of the outer periphery of the transformer body (1), and the oil breathing assembly (4) is used to provide a gradient expansion space for the transformer oil inside the transformer body (1); The gas breathing assembly (2) comprises a container cover (201), a piston cylinder (202) is fixedly mounted on the top of the inner cavity of the container cover (201), a piston (203) is slidably mounted inside the piston cylinder (202), and a first spring (204) is fixedly mounted between the top of the piston (203) and the top of the inner cavity of the container cover (201); The container cover (201) and the piston cylinder (202) are both fixedly mounted on the top of the transformer body (1); the top of the transformer body (1) is provided with a pressure hole (102) and a plurality of air guide holes (103), wherein the pressure hole (102) is in communication with the piston cylinder (202), and the plurality of air guide holes (103) are in communication with the container cover (201); A connecting rod (205) is fixedly mounted on the bottom of the piston (203), the bottom of the connecting rod (205) passes through the pressure hole (102) and is fixedly mounted with a bracket (206), and a plurality of blocking cones (207) are fixedly mounted on the top of the bracket (206), and the blocking cones (207) are used in conjunction with the air guide hole (103); The outer circumference of the piston cylinder (202) is provided with a plurality of through grooves (208), and the plurality of through grooves (208) are used in conjunction with the piston (203).

2. The transformer with explosion-proof protection structure according to claim 1, characterized in that: The cooling cover assembly (3) comprises a bent sunshade (301), and two groups of cooling fans (302) are fixedly mounted on the bottom of the bent sunshade (301); The bent sunshade (301) is fixedly mounted on the top of the transformer body (1) via a mounting rod (303), and the gas breathing assembly (2) is arranged below the bent sunshade (301).

3. The transformer with explosion-proof protection structure according to claim 1, characterized in that: Several groups of heat-conducting rings (209) are fixedly mounted on the outer periphery of the container cover (201) in sequence from top to bottom, and several groups of heat-dissipating fins (2010) are fixedly mounted on the outer periphery of the heat-conducting rings (209).

4. The transformer with explosion-proof protection structure according to claim 2, characterized in that: The oil breathing assembly (4) comprises a first extension box (401), a second extension box (402), a third extension box (403) and a fourth extension box (404) which are connected in sequence. The first extension box (401), the second extension box (402), the third extension box (403) and the fourth extension box (404) are respectively fixedly mounted on the periphery of the transformer body (1). An oil guide port (104) is provided on the back of the transformer body (1). The oil guide port (104) is connected to the first extension box (401). The first extension box (401), the second extension box (402), the third extension box (403) and the fourth extension box (404) are all provided with elastic sealing members (5). The four elastic sealing members (5) are used to control the transformer oil in the transformer body (1) to enter the first extension box (401) through the oil guide port (104) and then enter the second extension box (402), the third extension box (403) and the fourth extension box (404) in sequence.

5. The transformer with explosion-proof protection structure according to claim 4, characterized in that: The elastic blocking member (5) comprises two guide rods (501), one end of the two guide rods (501) is fixedly mounted with a blocking slider (502), the other end of the two guide rods (501) is fixedly mounted with a U-shaped bridging frame (503), and the outer periphery of the guide rods (501) is also sleeved with a second spring (504).

6. The transformer with explosion-proof protection structure according to claim 5, characterized in that: The first expansion box (401) is provided with a blocking slider (502) of an elastic blocking member (5) which is slidably mounted inside the first expansion box (401), the two guide rods (501) both pass through the first expansion box (401) and extend to the top of the first expansion box (401), and the two ends of the second spring (504) are respectively fixedly connected to the U-shaped lap frame (503) and the side opposite to the first expansion box (401), and the oil guide port (104) is provided below the blocking slider (502); The second extension box (402) is provided with a blocking slider (502) of an elastic blocking member (5) which is slidably mounted inside the second extension box (402); the two guide rods (501) both penetrate the second extension box (402) and extend to the bottom of the second extension box (402); and the two ends of the second spring (504) are fixedly connected to the U-shaped lap frame (503) and the side opposite to the second extension box (402); one side of the second extension box (402) is connected to an oil filling head (105), and the oil filling head (105) is arranged above the blocking slider (502); and the bottom of the outer periphery of the transformer body (1) is also connected to an oil drain head (106); The blocking slider (502) of the elastic blocking member (5) provided in the third expansion box (403) is slidably installed inside the third expansion box (403), the two guide rods (501) both pass through the third expansion box (403) and extend to the top of the third expansion box (403), and the two ends of the second spring (504) are respectively fixedly connected to the U-shaped bridging frame (503) and the side opposite to the third expansion box (403); The blocking slider (502) of the elastic blocking member (5) provided in the fourth extension box (404) is slidably installed inside the fourth extension box (404), the two guide rods (501) both pass through the fourth extension box (404) and extend to the bottom of the fourth extension box (404), and the two ends of the second spring (504) are respectively fixedly connected to the U-shaped lap frame (503) and the side opposite to the fourth extension box (404).

7. The transformer with explosion-proof protection structure according to claim 6, characterized in that: The surfaces of the first extension box (401), the second extension box (402), the third extension box (403) and the fourth extension box (404) are respectively fixedly mounted with a first trigger switch (406), a second trigger switch (407), a third trigger switch (408) and a fourth trigger switch (409) via a connecting frame (405). The first trigger switch (406), the second trigger switch (407), the third trigger switch (408) and the fourth trigger switch (409) are all used in conjunction with the U-shaped connecting frame (503) and the cooling fan (302).

8. The transformer with explosion-proof protection structure according to claim 7, characterized in that: The elastic strength of the second springs (504) provided in the first extension box (401), the second extension box (402), the third extension box (403) and the fourth extension box (404) increases in sequence.

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