An epoxy resin cast dry-type transformer

Abstract

The present application relates to the field of transformers, and in particular to an epoxy resin cast dry-type transformer, comprising an upper clamp, a lower clamp, a warning assembly and a plurality of main coils, adjacent main coils are cross-connected with connecting rods, the warning assembly comprises a warning plate, a contact switch 1, a warning light and a plurality of thermal expansion and contraction blocks, a sliding cavity is provided on the surface of the lower clamp, a plurality of thermal expansion and contraction blocks are connected at intervals on the surface of the warning plate facing the connecting rod, the ends of the thermal expansion and contraction blocks away from the warning plate correspond to and are connected to the connecting rod one by one, the warning light is connected to the surface of the warning plate facing the connecting rod, the contact switch 1 is connected to the inner wall of the sliding cavity, and the contact switch 1 is electrically connected to the warning light. In the present application, the warning plate, the contact switch 1, the warning light and the thermal expansion and contraction blocks are arranged, and the warning light is energized and illuminated, warning pedestrians not to accidentally touch the outer wall of the epoxy resin cast dry-type transformer and get hurt or scalded, thereby improving the safety of using the epoxy resin cast dry-type transformer.

Description

Technical Field

[0001] The present application relates to the field of transformers, and in particular to an epoxy resin cast dry-type transformer. Background Art

[0002] Epoxy resin cast dry-type transformer is a dry-type transformer that uses epoxy resin as the insulating material and is cured through a vacuum casting process.

[0003] During the use of epoxy resin cast dry-type transformers, since the wiring terminals on the epoxy resin cast dry-type transformers are connected to the high-voltage power supply, the epoxy resin cast dry-type transformers will generate a lot of heat during normal operation. Pedestrians passing by may easily touch the outer wall of the epoxy resin cast dry-type transformer and get bruised or burned. Summary of the invention

[0004] In order to improve the safety problem of using epoxy resin cast dry-type transformers, the present application provides an epoxy resin cast dry-type transformer.

[0005] The present application provides an epoxy resin cast dry-type transformer, which adopts the following technical solution:

[0006] A epoxy resin cast dry-type transformer comprises an upper clamp, a lower clamp, a warning assembly and a plurality of main coils, wherein one end of the plurality of main coils is connected to the surface of the lower clamp at intervals, and the other ends of the plurality of main coils are connected to the surface of the upper clamp at intervals, and connecting rods are cross-connected between adjacent main coils. The warning assembly comprises a warning plate, a contact switch 1, a warning light and a plurality of thermal expansion and contraction blocks. A sliding cavity for sliding the warning plate is provided on the surface of the lower clamp facing the main coil, and the plurality of thermal expansion and contraction blocks are connected to the surface of the warning plate facing the connecting rod at intervals, and the ends of the thermal expansion and contraction blocks away from the warning plate correspond to and are connected to the connecting rod one by one. The warning light is connected to the surface of the warning plate facing the connecting rod, and the contact switch 1 is connected to the inner wall of the sliding cavity. The contact switch 1 is electrically connected to the warning light. When the thermal expansion and contraction block heats up and expands, the warning plate is driven to slide in a direction close to the contact switch 1, and the contact switch 1 abuts against the warning plate and is turned on, so that the warning light is electrically illuminated.

[0007] By adopting the above technical scheme, when the epoxy resin cast dry-type transformer is in use, the main coil converts part of the electrical energy into thermal energy, and the main coil transfers part of the thermal energy to the connecting rod. After the connecting rod is heated up, the thermal energy is transferred to the thermal expansion and contraction block. The thermal expansion and contraction block is heated up and expanded, and the thermal expansion and contraction block drives the warning plate to slide along the inner wall of the sliding cavity toward the direction close to the contact switch 1. The contact switch 1 abuts the warning plate and is turned on. The warning light is energized and illuminates, warning pedestrians not to accidentally touch the outer wall of the epoxy resin cast dry-type transformer and get hurt or scalded, thereby improving the safety of the use of the epoxy resin cast dry-type transformer.

[0008] Optionally, the warning component further includes a plurality of fluorescent strips, and the fluorescent strips correspond to and are connected to the connecting rods one by one.

[0009] By adopting the above technical solution, the fluorescent strip glows in the dark, making it difficult for workers to accidentally touch the surface of the epoxy resin cast dry-type transformer and get hurt, thereby further improving the safety of the use of the epoxy resin cast dry-type transformer.

[0010] Optionally, the lower clamp is connected to a cooling component, which includes a cooling piston and a cooling screw. A cooling chamber is opened in the lower clamp for the cooling piston to slide. The cooling screw is rotatably connected to the inner wall of the cooling chamber, and the cooling piston is threadedly connected to the outer wall of the cooling screw. The cooling piston slides on the inner wall of the cooling chamber along the axis of the cooling screw. The cooling piston divides the cooling chamber into two cooling sections. The inner walls of the cooling sections are each provided with exhaust holes, and the exhaust holes pass through the surface of the lower clamp and face the main coil.

[0011] By adopting the above technical scheme, the cooling screw rotates on the inner wall of the cooling chamber, driving the cooling piston to slide back and forth along the axis of the cooling screw on the inner wall of the cooling chamber, the air pressure in one cooling section is reduced, and the outside air enters the cooling section through the exhaust hole, and the air pressure in the other cooling section is increased. The air in the cooling section hits the outer wall of the main coil through the exhaust hole, promoting the air flow between the multiple main coils, so that the main coil is fully in contact with the air and heat exchange is carried out, thereby realizing the cooling of the main coil, making it difficult for the epoxy resin cast dry-type transformer to heat up during operation, ensuring that pedestrians are not easily burned by accidentally touching the surface of the epoxy resin cast dry-type transformer, thereby improving the safety of the use of the epoxy resin cast dry-type transformer.

[0012] Optionally, the cooling component also includes at least two one-way valves 1 and at least two one-way valves 2, the one-way valves 1 corresponding one-to-one with the exhaust holes and connected to the inner wall of the exhaust holes, the one-way valves 1 are used to discharge the air in the cooling section, the inner wall of the cooling section is provided with air inlet holes, the air inlet holes penetrate the surface of the lower clamp, the one-way valves 2 correspond one-to-one with the air inlet holes and connected to the inner wall of the air inlet holes, the one-way valves 2 are used to allow outside air to enter the cooling section through the air inlet holes.

[0013] By adopting the above technical solution, when the cooling piston slides on the inner wall of the cooling chamber, the air in one of the cooling sections is driven to be discharged from the exhaust hole through the one-way valve 1, and the outside air is driven to enter the cooling section from the air inlet hole through the one-way valve 2, thereby promoting the air flow in the cooling chamber. The air fully contacts the inner wall of the cooling chamber and performs heat exchange, thereby achieving cooling of the lower clamp.

[0014] Optionally, a connecting channel is provided on the surface of the connecting rod facing the thermal expansion and contraction block, and the connecting channel penetrates the outer wall of the connecting rod in a direction away from the thermal expansion and contraction block; a through cavity is provided on the surface of the thermal expansion and contraction block facing the connecting channel, and the through cavity penetrates the outer wall of the thermal expansion and contraction block in a direction close to the warning plate; a cooling channel is provided on the surface of the warning plate facing the through cavity, and the cooling channel penetrates the warning plate surface in a direction close to the exhaust hole; an opening and closing channel is provided on the inner wall of the sliding cavity close to the exhaust hole, and the opening and closing channel is connected to the exhaust hole. When the thermal expansion and contraction block heats up and expands, the opening and closing channel is connected to the cooling channel.

[0015] By adopting the above technical scheme, when the thermal expansion and contraction block heats up and expands, the thermal expansion and contraction block drives the warning plate to slide in the direction close to the contact switch 1, and the opening and closing flow channel is connected to the cooling flow channel. When the air pressure in the cooling section increases, the air in the cooling section passes through the one-way valve 1, the exhaust hole, the opening and closing flow channel, the cooling flow channel, the through cavity and is discharged from the connecting flow channel in sequence. The air fully contacts the inner wall of the connecting flow channel and performs heat exchange, which increases the contact area between the connecting rod and the air, thereby improving the cooling efficiency of the connecting rod.

[0016] Optionally, the lower clamp is connected to an opening and closing assembly, which includes an opening and closing plate and an opening and closing block. The opening and closing plate is rotatably connected to the inner wall of the opening and closing channel close to the sliding cavity. The opening and closing plate surface is pressed against the inner wall of the opening and closing channel and separates the sliding cavity and the opening and closing channel. The opening and closing block is connected to the surface of the opening and closing plate facing the sliding cavity. The end of the opening and closing block protruding from the inner wall of the sliding cavity can abut against the surface of the warning plate and drive the opening and closing plate to rotate in the direction away from the sliding cavity, and the separation effect between the sliding cavity and the opening and closing channel disappears.

[0017] By adopting the above technical scheme, the surface of the opening and closing plate is pressed against the inner wall of the opening and closing channel and separates the sliding cavity and the opening and closing channel, so that the air in the cooling section is stably discharged from the exhaust hole through the one-way valve 1; when the thermal expansion and contraction block heats up and expands, the warning plate is driven to slide along the inner wall of the sliding cavity toward the contact switch 1, and the surface of the warning plate is pressed against the surface of the opening and closing block and drives the opening and closing plate to rotate away from the sliding cavity, and the pressing effect between the surface of the opening and closing plate and the inner wall of the opening and closing channel disappears, and the air in the exhaust hole passes through the opening and closing channel, the cooling channel, and the through cavity and is discharged from the connecting channel, thereby realizing the directional opening and closing of the opening and closing channel and the sliding cavity.

[0018] Optionally, the opening and closing assembly also includes an elastic member, one end of the elastic member in the elastic force direction is connected to the rotating shaft of the opening and closing plate, and the other end of the elastic member in the elastic force direction is connected to the inner wall of the opening and closing channel. The elastic member has an elastic force that drives the opening and closing plate to slide toward the direction close to the sliding cavity, and the opening and closing plate surface tends to press against the inner wall of the opening and closing channel.

[0019] By adopting the above technical solution, when the thermal expansion and contraction block cools down and contracts, it drives the warning plate to slide along the inner wall of the sliding cavity in the direction away from the contact switch 1, and the pressing effect of the warning plate on the opening and closing block disappears. The elastic force of the elastic member drives the opening and closing plate to rotate in the direction close to the sliding cavity. The surface of the opening and closing plate presses against the inner wall of the opening and closing channel and separates the sliding cavity and the opening and closing channel, thereby improving the stability of the separation between the sliding cavity and the opening and closing channel.

[0020] Optionally, the cooling component also includes a mounting block and a cooling motor, the end of the cooling screw rod penetrates the inner wall of the cooling chamber, the mounting block is connected to the surface of the lower clamp facing the end of the cooling screw rod, the cooling motor is connected to the surface of the mounting block, and the end of the motor shaft of the cooling motor is coaxially connected to the end of the cooling screw rod.

[0021] By adopting the above technical scheme, the end of the cooling screw rod passes through the inner wall of the cooling chamber and is coaxially connected to the motor shaft of the cooling motor. The cooling motor drives the cooling screw rod to rotate on the inner wall of the cooling chamber, and drives the cooling piston to slide back and forth along the axis of the cooling screw rod on the inner wall of the cooling chamber, thereby improving the stability of the cooling piston sliding on the inner wall of the cooling chamber.

[0022] Optionally, the cooling assembly also includes an embedding block and a cooling connecting rod, the mounting block is slidably connected to the surface of the lower clamp, the sliding direction of the mounting block and the axis of the cooling screw are parallel to each other, the embedding block is connected to the end face of the motor shaft of the cooling motor, the end face of the cooling screw is provided with an embedding groove for the embedding block to be embedded, one end of the cooling connecting rod is rotatably connected to the warning plate surface, and the other end of the cooling connecting rod is rotatably connected to the surface of the mounting block, when the warning plate slides along the inner wall of the sliding cavity toward the direction close to the contact switch 1, the cooling connecting rod drives the mounting block close to the cooling screw, and the embedding block is embedded in the embedding groove.

[0023] By adopting the above technical scheme, when the thermal expansion and contraction block heats up and expands, and drives the warning plate to slide along the inner wall of the sliding cavity toward the direction close to the contact switch 2, the cooling connecting rod receives the power of the warning plate and drives the mounting block to slide toward the direction close to the cooling screw rod, the embedded block is embedded in the embedded groove, and the outer peripheral surface of the embedded block is pressed against the inner wall of the embedded groove, thereby realizing the directional connection between the cooling motor and the cooling screw rod.

[0024] Optionally, the cooling component also includes contact switch 2, which is connected to the inner wall of the embedded groove and is electrically connected to the cooling motor. When the embedded block is embedded in the embedded groove, the contact switch 2 abuts against the embedded block and is turned on, and the cooling motor is energized and runs.

[0025] By adopting the above technical solution, when the mounting block is close to the cooling screw rod, the embedding block is embedded in the embedding groove, the second contact switch abuts the embedding block and is turned on, the cooling motor is energized and runs, and the directional start of the cooling motor is achieved, so that the cooling motor does not need to keep running all the time, reducing energy loss, thereby embodying the concept of energy saving.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Warning plate, contact switch, warning light and thermal expansion and contraction block are set. The warning light is energized and illuminated to warn pedestrians not to accidentally touch the outer wall of the epoxy resin cast dry-type transformer and get hurt or burned, thereby improving the safety of the use of epoxy resin cast dry-type transformer;

[0028] 2. The setting of fluorescent strips makes it difficult for workers to accidentally touch the surface of epoxy resin cast dry-type transformers and get hurt, further improving the safety of epoxy resin cast dry-type transformers;

[0029] 3. The setting of the cooling piston and the cooling screw rod can realize the cooling of the main coil, so that the epoxy resin cast dry-type transformer is not easy to heat up during operation, ensuring that pedestrians are not easy to accidentally touch the surface of the epoxy resin cast dry-type transformer and get burned, thereby improving the safety of the use of the epoxy resin cast dry-type transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0031] Figure 2 It is a schematic diagram of the local structure in an embodiment of the present application, mainly showing the warning component.

[0032] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0033] Figure 4 It is a schematic diagram of the local structure in the embodiment of the present application, mainly showing the cooling component.

[0034] Figure 5 It is a schematic diagram of the overall structure of the opening and closing assembly in the embodiment of the present application.

[0035] Description of the reference numerals: 1. Upper clamp; 2. Lower clamp; 21. Sliding cavity; 22. Cooling cavity; 221. Cooling section; 23. Exhaust hole; 24. Air inlet hole; 25. Installation cavity; 26. Slide groove; 27. Opening and closing flow channel; 28. Rotating cavity; 3. Warning component; 31. Warning plate; 311. Cooling flow channel; 32. Contact switch 1; 33. Warning light; 34. Thermal expansion and contraction block; 341. Through cavity; 35. Fluorescent strip ; 4. Main coil; 5. Connecting rod; 51. Connecting flow channel; 6. Cooling assembly; 61. Cooling piston; 62. Cooling screw; 621. Embedded groove; 63. Mounting block; 64. Cooling motor; 65. Embedded block; 66. Cooling connecting rod; 67. Contact switch 2; 68. One-way valve 1; 69. One-way valve 2; 7. Slider; 8. Opening and closing assembly; 81. Opening and closing plate; 82. Opening and closing block; 821. Guide surface; 83. Elastic part. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-5 This application is described in further detail.

[0037] The present application embodiment discloses an epoxy resin cast dry-type transformer. Figure 1 An epoxy resin cast dry-type transformer comprises an upper clamp 1, a lower clamp 2, a warning component 3 and a plurality of main coils 4, the bottom of the lower clamp 2 abuts the ground to form a support, one end of the plurality of main coils 4 is connected to the top surface of the lower clamp 2 at intervals, and the other end of the plurality of main coils 4 is connected to the surface of the upper clamp 1 at intervals, the length direction of the upper clamp 1 and the length direction of the lower clamp 2 are parallel to each other, the arrangement direction of the main coils 4 and the length direction of the lower clamp 2 are parallel to each other, and the height direction of the main coils 4 and the height direction of the lower clamp 2 are parallel to each other, and connecting rods 5 are cross-connected between adjacent main coils 4, and the warning component 3 is installed on the lower clamp 2, and the warning component 3 can emit light to warn users not to accidentally touch the surface of the epoxy resin cast dry-type transformer and get injured or scalded, thereby improving the safety of using the epoxy resin cast dry-type transformer.

[0038] Reference Figure 1 and Figure 2 The warning component 3 includes a warning plate 31, a contact switch 32, a warning light 33, a plurality of thermal expansion and contraction blocks 34 and a plurality of fluorescent strips 35. The fluorescent strips 35 correspond to the connecting rods 5 one by one and are connected to the surface of the connecting rods 5. The fluorescent strips 35 are used to emit light in a dark environment to warn pedestrians to avoid the epoxy resin cast dry-type transformer, reduce the occurrence of pedestrians accidentally hitting the surface of the epoxy resin cast dry-type transformer and getting injured, thereby improving the safety of the epoxy resin cast dry-type transformer.

[0039] Reference Figure 1 and Figure 2 A sliding cavity 21 for sliding the warning plate 31 is provided on the surface of the lower clamp 2 facing the main coil 4, and the sliding direction of the warning plate 31 is parallel to the height direction of the lower clamp 2. The material of the thermal expansion and contraction block 34 can be a memory alloy or nylon. In the embodiment of the present application, the material of the thermal expansion and contraction block 34 is a memory alloy with a good thermal expansion coefficient. One end of a plurality of thermal expansion and contraction blocks 34 is connected at intervals on the surface of the warning plate 31 facing the connecting rod 5, and the arrangement direction of the thermal expansion and contraction blocks 34 is parallel to the length direction of the lower clamp 2. The other end of the thermal expansion and contraction blocks 34 corresponds to and is connected to the connecting rod 5 one by one. The number of warning lights 33 can be one, two or more. In the embodiment of the present application, the number of warning lights 33 is multiple, and the plurality of warning lights 33 are connected at intervals on the surface of the warning lights 33 facing the connecting rod 5, and the arrangement direction of the warning lights 33 is parallel to the length direction of the lower clamp 2. A contact switch 1 32 is connected to the inner wall of the sliding cavity 21, and the contact switch 1 32 is electrically connected to the plurality of warning lights 33.

[0040] Reference Figure 1 and Figure 2 When the epoxy resin cast dry-type transformer is running, the connecting rod 5 converts part of the electrical energy into thermal energy, and the connecting rod 5 transfers part of the thermal energy to the thermal expansion and contraction block 34. The thermal expansion and contraction block 34 heats up and expands. The thermal expansion and contraction block 34 drives the warning plate 31 to slide along the inner wall of the sliding cavity 21 toward the direction close to the contact switch 1 32. The contact switch 1 32 abuts against the warning plate 31 and is turned on. The warning light 33 is energized and illuminates, warning pedestrians not to accidentally touch the outer wall of the epoxy resin cast dry-type transformer and get hurt or scalded, thereby improving the safety of the epoxy resin cast dry-type transformer.

[0041] Reference Figure 2 and Figure 3 The lower clamp 2 is provided with a cooling component 6, which can cool the main coil 4. The cooling component 6 includes a cooling piston 61, a cooling screw rod 62, a mounting block 63, a cooling motor 64, an insert block 65, a cooling connecting rod 66, a contact switch 67, at least two one-way valves 1 68 and at least two one-way valves 2 69. The cooling piston 61 can be made of rubber or silicone. In the embodiment of the present application, the cooling piston 61 is made of silicone, which has a certain deformation ability. A cooling chamber 22 for the cooling piston 61 to slide is provided in the lower clamp 2. The sliding direction of the cooling piston 61 is parallel to the width direction of the lower clamp 2. The cooling piston 61 The cooling chamber 22 is divided into two cooling sections 221. The inner walls of the cooling sections 221 are provided with exhaust holes 23 and air inlet holes 24. The exhaust holes 23 and the air inlet holes 24 both penetrate the surface of the lower clamp 2 in the direction close to the main coil 4. In the embodiment of the present application, there are two one-way valves 68 and two one-way valves 69. The one-way valves 68 correspond one-to-one to the exhaust holes 23 and are installed on the inner walls of the exhaust holes 23. The one-way valves 68 allow the air in the cooling section 221 to be discharged through the exhaust holes 23. The one-way valves 69 correspond one-to-one to the air inlet holes 24 and are installed on the inner walls of the air inlet holes 24. The one-way valves 69 allow the outside air to enter the cooling section 221 through the air inlet holes 24.

[0042] Reference Figure 2 and Figure 3The cooling screw rod 62 is rotatably connected to the inner wall of the cooling chamber 22, the axis of the cooling screw rod 62 and the width direction of the lower clamp 2 are parallel to each other, the cooling piston 61 is threadedly connected to the outer wall of the cooling screw rod 62, and the cooling piston 61 slides back and forth on the inner wall of the cooling chamber 22 along the axis of the cooling screw rod 62; the end of the cooling screw rod 62 passes through the inner wall of the cooling chamber 22 in the direction close to the warning plate 31, and the surface of the lower clamp 2 facing the main coil 4 is provided with a mounting cavity 25 for the sliding of the mounting block 63, the sliding direction of the mounting block 63 and the axis of the cooling screw rod 62 are parallel to each other, the mounting block 63 is located between the cooling screw rod 62 and the warning plate 31, and the mounting block 63 is fixed with a slider 7 in the direction of the mounting cavity 25, and the inner wall of the mounting cavity 25 is provided with a slide groove 26 for the sliding of the slider 7, so that the mounting block 63 is not easily offset during the sliding process of the inner wall of the mounting cavity 25, thereby improving the sliding stability of the mounting block 63.

[0043] Reference Figure 2 and Figure 3 The cooling motor 64 is fixed to the top surface of the mounting block 63 by bolts, the motor axis of the cooling motor 64 coincides with the axis of the cooling screw 62, the motor shaft end of the cooling motor 64 faces the end surface of the cooling screw 62, the insert block 65 is fixed to the motor shaft end surface of the cooling motor 64, the end surface of the cooling screw 62 facing the mounting cavity 25 is provided with an embedding groove 621 for the embedding block 65 to be embedded, the contact switch 67 is installed on the inner wall of the embedding groove 621, and the contact switch 67 is electrically connected to the cooling motor 64; the mounting cavity 25 is connected to the sliding cavity 21, one end of the cooling connecting rod 66 is rotatably connected to the board surface of the warning plate 31, and the other end of the cooling connecting rod 66 is rotatably connected to the surface of the mounting block 63; When the thermal expansion and contraction block 34 heats up and expands, the warning plate 31 is driven to slide along the inner wall of the sliding cavity 21 toward the direction close to the contact switch 1 32, and the cooling connecting rod 66 receives the power of the warning plate 31 and drives the mounting block 63 close to the cooling screw 62, and the embedded block 65 is embedded in the embedded groove 621, and the outer peripheral surface of the embedded block 65 is pressed against the inner wall of the embedded groove 621 to form a limit, so that the cooling motor 64 and the cooling screw 62 are coaxially fixed, and at the same time, the contact switch 2 67 abuts against the embedded block 65 and is turned on, the cooling motor 64 is energized and runs, driving the cooling screw 62 to rotate, so that the cooling motor 64 does not need to keep running all the time, reducing energy loss, thereby reflecting the concept of energy saving.

[0044] Reference Figure 2 and Figure 3At the same time, when the cooling piston 61 slides back and forth along the axis of the cooling screw rod 62, the air pressure in one of the cooling sections 221 decreases, and the outside air enters the cooling section 221 from the one-way valve 2 69 through the air inlet 24, and the air pressure in the other cooling section 221 increases. The air in the cooling section 221 is discharged from the exhaust hole 23 through the one-way valve 1 68 and impacts the surface of the main coil 4, driving the air flow between adjacent main coils 4, so that the main coil 4 is fully in contact with the air and heat exchange is carried out, thereby achieving cooling of the main coil 4, making it difficult for the epoxy resin cast dry-type transformer to be worn out due to long-term operation at high temperature, thereby extending the service life of the epoxy resin cast dry-type transformer.

[0045] Reference Figure 1 and Figure 4 A connecting flow channel 51 is provided on the surface of the connecting rod 5 facing the thermal expansion and contraction block 34, and the connecting flow channel 51 penetrates the rod surface of the connecting rod 5 in the direction close to the upper clamp 1. A through cavity 341 is provided on the surface of the thermal expansion and contraction block 34 facing the connecting flow channel 51, and the through cavity 341 penetrates the outer wall of the thermal expansion and contraction block 34 in the direction close to the warning plate 31. A cooling flow channel 311 is provided on the surface of the warning plate 31 facing the through cavity 341, and the cooling flow channel 311 penetrates the plate surface of the warning plate 31 in the direction close to the exhaust hole 23. The inner wall of the sliding cavity 21 close to the exhaust hole 23 An opening and closing flow channel 27 is provided, and the opening and closing flow channel 27 is connected to the exhaust hole 23; when the warning plate 31 slides along the inner wall of the sliding cavity 21 toward the direction close to the contact switch 32, the opening and closing flow channel 27 is connected to the cooling flow channel 311, and the air in the cooling section 221 passes through the one-way valve 68, the exhaust hole 23, the opening and closing flow channel 27, the cooling flow channel 311, and the through cavity 341 in sequence and is discharged from the connecting flow channel 51, thereby increasing the contact area between the connecting rod 5 and the air, and the inner wall of the connecting flow channel 51 is in full contact with the air and performs heat exchange, thereby improving the cooling efficiency of the connecting rod 5.

[0046] Reference Figure 4 and Figure 5 The lower clamp 2 is equipped with an opening and closing component 8, which can control the opening and closing of the sliding chamber 21 and the opening and closing channel 27. The opening and closing component 8 includes an opening and closing plate 81, an opening and closing block 82 and an elastic member 83. The elastic member 83 can be a tension spring or a torsion spring. In the embodiment of the present application, the elastic member 83 is a torsion spring with a certain deformation ability. The inner wall of the opening and closing channel 27 near the sliding chamber 21 is provided with a rotating chamber 28 for the opening and closing plate 81 to rotate. The rotation axis of the opening and closing plate 81 and the length direction of the lower clamp 2 are parallel to each other. One end of the elastic member 83 in the elastic direction is connected to the rotating axis of the opening and closing plate 81, and the other end of the elastic member 83 in the elastic direction is connected to the inner wall of the rotating chamber 28. The elastic member 83 has an elastic force to drive the opening and closing plate 81 to slide in the direction close to the sliding chamber 21, and the plate surface of the opening and closing plate 81 is pressed against the inner wall of the rotating chamber 28 and separates the opening and closing channel 27 and the sliding chamber 21.

[0047] Reference Figure 4 and Figure 5 One end of the opening and closing block 82 is fixed to the plate surface of the opening and closing plate 81 facing the sliding chamber 21, and the other end of the opening and closing plate 81 protrudes from the inner wall of the sliding chamber 21. The end of the opening and closing plate 81 protruding from the inner wall of the sliding chamber 21 is provided with a guide surface 821, and the guide surface 821 is in the shape of a circular arc protrusion. The guide surface 821 can abut against the plate surface of the warning plate 31 and drive the warning plate 31 to rotate in the direction away from the sliding chamber 21. The pressing effect of the plate surface of the warning plate 31 on the inner wall of the rotating chamber 28 disappears, and the air in the opening and closing flow channel 27 enters the heat dissipation flow channel through the rotating chamber 28, thereby realizing the directional start of the opening and closing flow channel 27 and the sliding chamber 21.

[0048] The implementation principle of an epoxy resin cast dry-type transformer in an embodiment of the present application is as follows: when the epoxy resin cast dry-type transformer is in operation, the connecting rod 5 converts part of the electrical energy into thermal energy, and the connecting rod 5 transfers part of the thermal energy to the thermal expansion and contraction block 34. The thermal expansion and contraction block 34 heats up and expands, and the thermal expansion and contraction block 34 drives the warning plate 31 to slide along the inner wall of the sliding cavity 21 toward the direction close to the contact switch 1 32. The contact switch 1 32 abuts against the warning plate 31 and is turned on. The warning light 33 is energized and illuminates, warning pedestrians not to accidentally touch the outer wall of the epoxy resin cast dry-type transformer and get hurt or scalded, thereby improving the safety of the use of the epoxy resin cast dry-type transformer.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An epoxy resin cast dry-type transformer, characterized in that: The invention comprises an upper clamp (1), a lower clamp (2), a warning component (3) and a plurality of main coils (4), wherein one end of the plurality of main coils (4) is connected to the surface of the lower clamp (2) at intervals, and the other end of the plurality of main coils (4) is connected to the surface of the upper clamp (1) at intervals, and connecting rods (5) are cross-connected between adjacent main coils (4). The warning component (3) comprises a warning plate (31), a contact switch (32), a warning light (33) and a plurality of thermal expansion and contraction blocks (34). The surface of the lower clamp (2) facing the main coil (4) is provided with a sliding cavity (21) for the warning plate (31) to slide, and the plurality of thermal expansion and contraction blocks (34) are connected to the warning plate (31) at intervals. The warning plate (31) faces the surface of the connecting rod (5); the end of the thermal expansion and contraction block (34) away from the warning plate (31) corresponds to and is connected to the connecting rod (5); the warning light (33) is connected to the surface of the warning plate (31) facing the connecting rod (5); the contact switch (32) is connected to the inner wall of the sliding cavity (21); the contact switch (32) is electrically connected to the warning light (33); when the thermal expansion and contraction block (34) heats up and expands, it drives the warning plate (31) to slide in a direction close to the contact switch (32); the contact switch (32) abuts against the warning plate (31) and is turned on, and the warning light (33) emits light.

2. The epoxy resin cast dry-type transformer according to claim 1, characterized in that: The warning component (3) further comprises a plurality of fluorescent strips (35), wherein the fluorescent strips (35) correspond to and are connected to the connecting rods (5) one by one.

3. The epoxy resin cast dry-type transformer according to claim 1, characterized in that: The lower clamp (2) is connected to a cooling component (6), and the cooling component (6) includes a cooling piston (61) and a cooling screw (62). A cooling chamber (22) is provided in the lower clamp (2) for the cooling piston (61) to slide. The cooling screw (62) is rotatably connected to the inner wall of the cooling chamber (22). The cooling piston (61) is threadedly connected to the outer wall of the cooling screw (62). The cooling piston (61) slides on the inner wall of the cooling chamber (22) along the axis of the cooling screw (62). The cooling piston (61) divides the cooling chamber (22) into two cooling sections (221). The inner walls of the cooling sections (221) are each provided with an exhaust hole (23). The exhaust hole (23) passes through the surface of the lower clamp (2) and faces the main coil (4).

4. The epoxy resin cast dry-type transformer according to claim 3, characterized in that: The cooling component (6) further comprises at least two one-way valves (68) and at least two one-way valves (69). The one-way valves (68) correspond one-to-one with the exhaust holes (23) and are connected to the inner wall of the exhaust holes (23). The one-way valves (68) are used to discharge air from the cooling section (221). The inner wall of the cooling section (221) is provided with air inlet holes (24). The air inlet holes (24) penetrate the surface of the lower clamp (2). The one-way valves (69) correspond one-to-one with the air inlet holes (24) and are connected to the inner wall of the air inlet holes (24). The one-way valves (69) are used to allow external air to enter the cooling section (221) through the air inlet holes (24).

5. The epoxy resin cast dry-type transformer according to claim 4, characterized in that: A connecting channel (51) is provided on the surface of the connecting rod (5) facing the thermal expansion and contraction block (34), and the connecting channel (51) penetrates the outer wall of the connecting rod (5) in a direction away from the thermal expansion and contraction block (34). A through cavity (341) is provided on the surface of the thermal expansion and contraction block (34) facing the connecting channel (51), and the through cavity (341) penetrates the outer wall of the thermal expansion and contraction block (34) in a direction close to the warning plate (31). The warning plate (31) faces the connecting rod (5). A cooling channel (311) is provided on the surface of the through cavity (341), and the cooling channel (311) penetrates the surface of the warning plate (31) in a direction close to the exhaust hole (23). An opening and closing channel (27) is provided on the inner wall of the sliding cavity (21) close to the exhaust hole (23), and the opening and closing channel (27) is connected to the exhaust hole (23). When the thermal expansion and contraction block (34) heats up and expands, the opening and closing channel (27) is connected to the cooling channel (311).

6. The epoxy resin cast dry-type transformer according to claim 5, characterized in that: The lower clamp (2) is connected to an opening and closing assembly (8), and the opening and closing assembly (8) includes an opening and closing plate (81) and an opening and closing block (82). The opening and closing plate (81) is rotatably connected to the inner wall of the opening and closing channel (27) close to the sliding cavity (21). The opening and closing plate (81) is pressed against the inner wall of the opening and closing channel (27) and separates the sliding cavity (21) and the opening and closing channel (27). The opening and closing block (82) is connected to the surface of the opening and closing plate (81) facing the sliding cavity (21). The end of the opening and closing block (82) protruding from the inner wall of the sliding cavity (21) can abut against the surface of the warning plate (31) and drive the opening and closing plate (81) to rotate in a direction away from the sliding cavity (21), and the separation effect between the sliding cavity (21) and the opening and closing channel (27) disappears.

7. The epoxy resin cast dry-type transformer according to claim 6, characterized in that: The opening and closing assembly (8) further comprises an elastic member (83), one end of the elastic member (83) in the elastic direction is connected to the rotation axis of the opening and closing plate (81), and the other end of the elastic member (83) in the elastic direction is connected to the inner wall of the opening and closing channel (27). The elastic member (83) has an elastic force that drives the opening and closing plate (81) to slide in a direction close to the sliding cavity (21), and the plate surface of the opening and closing plate (81) tends to press against the inner wall of the opening and closing channel (27).

8. The epoxy resin cast dry-type transformer according to claim 3, characterized in that: The cooling component (6) further comprises a mounting block (63) and a cooling motor (64); the end of the cooling screw (62) penetrates the inner wall of the cooling chamber (22); the mounting block (63) is connected to the surface of the lower clamp (2) facing the end of the cooling screw (62); the cooling motor (64) is connected to the surface of the mounting block (63); and the end of the motor shaft of the cooling motor (64) is coaxially connected to the end of the cooling screw (62).

9. The epoxy resin cast dry-type transformer according to claim 8, characterized in that: The cooling component (6) also includes an insert (65) and a cooling connecting rod (66). The mounting block (63) is slidably connected to the surface of the lower clamp (2). The sliding direction of the mounting block (63) and the axis of the cooling screw (62) are parallel to each other. The insert (65) is connected to the end face of the motor shaft of the cooling motor (64). The end face of the cooling screw (62) is provided with an insert groove (621) for the insert (65) to be inserted. One end of the cooling connecting rod (66) is rotatably connected to the surface of the warning plate (31), and the other end of the cooling connecting rod (66) is rotatably connected to the surface of the mounting block (63). When the warning plate (31) slides along the inner wall of the sliding cavity (21) toward the direction close to the contact switch 1 (32), the cooling connecting rod (66) drives the mounting block (63) to approach the cooling screw (62), and the insert (65) is inserted into the insert groove (621).

10. The epoxy resin cast dry-type transformer according to claim 9, characterized in that: The cooling component (6) further comprises a second contact switch (67), wherein the second contact switch (67) is connected to the inner wall of the embedding groove (621), and the second contact switch (67) is electrically connected to the cooling motor (64). When the embedding block (65) is embedded in the embedding groove (621), the second contact switch (67) abuts against the embedding block (65) and is turned on, and the cooling motor (64) is energized and operates.

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