A high-voltage coil pouring device based on a dry-type transformer

Abstract

The application discloses a high-voltage coil pouring device based on a dry-type transformer and relates to the technical field of high-voltage coil pouring tools. The device comprises a rotary table, a rotating plate arranged in a notch on the top of the rotary table, a support arranged in the middle of the rotary table, a linear lifting motor arranged on the top of the support, a pouring machine mounted on the support, an inner mold pipe for forming an inner ring of the high-voltage coil vertically and fixedly connected to the middle of the top surface of the mounting seat, coil pouring molds slidingly arranged on the top of the mounting seat, a moving mechanism arranged in the middle of the mounting seat, a shunt mechanism arranged above the mold cover, a driving assembly arranged on the support, and the like. The device can improve the working efficiency of pouring the high-voltage coil, sufficiently perform vacuumizing operation on the inside of the mold cavity before pouring, improve the uniformity of the formed high-voltage coil after pouring, and improve the coating integrity and uniformity of the epoxy resin protective layer after pouring the high-voltage coil.

Description

Technical Field

[0001] This invention relates to the field of high-voltage coil casting tools, and more particularly to a high-voltage coil casting device based on a dry-type transformer. Background Technology

[0002] Epoxy resin casting of coils is a highly technical and complex manufacturing process. Typically, epoxy resin dry-type transformer coils are cast using an open casting process. This allows for the addition of liquid resin during the epoxy resin curing process, ensuring the cast high-voltage coil reaches the specified dimensional requirements. To guarantee product quality, the actual height of the cast coil is always higher than the designed height. Generally, an additional 50mm machining allowance is needed at the top to allow for marking, cutting, and polishing after the epoxy resin coil has cured and the mold has been opened. This ensures the coil meets the specified height requirements. The original casting process, due to the added 50mm machining allowance at the top, required marking and cutting 45mm after mold opening, with the remaining 5mm requiring manual polishing. Because the resin at the ends of dry-type transformer coils is very hard, manual cutting is extremely inefficient and lacks effective safety measures, resulting in low worker safety and a high risk of workplace injuries or occupational diseases. Therefore, this casting method is no longer suitable for current casting processes. Furthermore, this process also suffers from material waste and dust generation during grinding, which is harmful to operator health and pollutes the environment. Additionally, human error during cutting can easily lead to deviations in coil height, affecting the transformer's manufacturing quality. Existing disc-type coil casting processes are outdated and prone to uneven casting and air bubbles. Moreover, this open casting method requires dividing the coil turns into several segments, with a certain insulation height between each segment, and interlayer insulation based on interlayer voltage, which can result in low coil fill factor, poor heat dissipation, and material waste. Therefore, a high-voltage coil casting device for dry-type transformers that solves the above problems is proposed. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-voltage coil casting device based on a dry-type transformer.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a high-voltage coil casting device based on a dry-type transformer, comprising a turntable, a rotating plate horizontally rotatable in a slot at the top of the turntable, a support fixedly disposed in the middle of the turntable, and a linear lifting motor disposed at the top of the support. A support frame is horizontally fixed to a lifting seat on one side of the linear lifting motor, and a casting machine for high-voltage coil casting is mounted on the support frame. Circular openings are provided on the periphery of the top surface of the rotating plate, and a mounting seat is provided at the top of each circular opening. An inner mold tube for forming the inner coil of the high-voltage coil is vertically fixed to the center of the top surface of the mounting seat. Coil casting molds are slidably disposed on both sides of the top of the mounting seat, and a moving mechanism for opening and closing the coil casting molds is provided in the center of the mounting seat. The top of the coil casting mold... The system includes a mold cover, above which is a flow-diverting mechanism for diverting the casting liquid and for evacuating the inside of the coil casting mold. A drive assembly for rotating a rotating plate is mounted on a support. The flow-diverting mechanism includes a flow-diverting hopper located above the mold cover, a fixed pipe installed at the top opening of the flow-diverting hopper, a vertically sealed connecting pipe inserted into the fixed pipe, and a return assembly sleeved on the upper part of the connecting pipe. The flow-diverting hopper is inverted, and a flow-diverting cavity is formed in its inner wall. Multiple flow-diverting pipes are vertically connected to the bottom periphery of the flow-diverting hopper, with the bottom ends of the flow-diverting pipes penetrating the mold cover. Suction pipes for evacuating the inside of the coil casting mold are horizontally fixed and connected to the lower parts of both sides of the fixed pipe. The outer ends of the suction pipes are connected to a purification assembly for air filtration.

[0005] Preferably, a sealing ring is fixed to the inner end of the suction tube, and the inner wall of the sealing ring is in a sealed fit with the outer wall of the lower part of the connecting tube; a sealing component is provided at the inner end of the suction tube.

[0006] Preferably, the stabilizing mechanism includes a dual-axis motor located in the middle of the mounting base, a lead screw coaxially fixed to both ends of the dual-axis motor, a movable seat sleeved on the lead screw, and a connecting frame installed on the outer top of the movable seat. The mounting base has stabilizing openings on both sides for the movable seat and the lead screw to extend out. The bottom surface of the connecting frame slides against the top of the mounting base, and the top two sides of the connecting frame are provided with supporting arc plates connected to the coil casting mold.

[0007] Preferably, the purification assembly includes a filter box located on the top surface of the lower frame of the connecting frame, an air extraction pipe vertically connected to the top of the filter box, a horizontal pipe connected to the bottom of the outer end of the filter box, and a purification tank located at the outer end of the horizontal pipe. Both sides of the outer end of the purification tank are connected to air guide pipes. Both sides of the interior of the movable seat are provided with mounting cavities, and a miniature vacuum pump connected to the air guide pipe is provided inside the mounting cavity. The top end of the air extraction pipe is fixedly connected to the outer end of the suction pipe.

[0008] Preferably, the filter box is provided with a double-layered dust filter screen, and the purification tank is provided with a layer of absorbent cotton screen.

[0009] Preferably, the return assembly includes an elliptical ring plate fixedly sleeved on the upper part of the connecting tube, a plurality of guide holes opened on the periphery of the top surface of the elliptical ring plate, and a stabilizing rod vertically movable inside the guide holes. The bottom end of the stabilizing rod is fixedly connected to the top surface of the fixed tube, and an anti-disengagement block is fixedly connected to the top end of the stabilizing rod. A return spring is movably sleeved on the stabilizing rod below the elliptical ring plate.

[0010] Preferably, the sealing assembly includes a cross rod, a fixed plate, a filter plate, a top rod that is laterally movable through the middle of the cross rod, and an abutment ball fixed to the inner end of the top rod, all disposed on the inner wall of the suction tube. The fixed plate has multiple through-holes equidistantly spaced on one side of its periphery. A return spring is movably sleeved on the top rod between the abutment ball and the cross rod. The filter plate is located inside the fixed plate, the cross rod is located inside the filter plate, and multiple sealing blocks for sealing the through-holes are fixed to the outer periphery of the filter plate. The outer end of the top rod is fixed to the inner side of the filter plate.

[0011] Preferably, the upper part of the outer wall of the connecting tube inside the fixed tube is provided with an air extraction port that cooperates with the suction tube, and the air extraction port is a wide-mouth structure facing outward.

[0012] Preferably, the drive assembly includes a servo motor disposed on one side of the bracket, a drive gear mounted at the bottom end of the servo motor drive shaft, and an internal gear ring fixed to the upper part of the inner ring of the rotating plate, wherein the drive gear meshes with the internal gear ring for transmission.

[0013] Preferably, liquid cooling pumps are installed at both the front and rear ends inside the mounting base, and cooling chambers are opened in the inner wall of the coil casting mold. The cooling chambers are equipped with serpentine heat dissipation pipes. The liquid outlet of the serpentine heat dissipation pipes extends into the slot of the turntable through a circular opening. The liquid inlet of the serpentine heat dissipation pipes is fixedly connected to the liquid outlet of the liquid cooling pump. Coolant is poured into the slot of the turntable. The liquid pump's suction pipe extends into the coolant in the slot of the turntable.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the cooperation of the coil casting mold, the moving mechanism, and the diversion mechanism, facilitates improved work efficiency during the casting of high-voltage coils. It not only enables rapid vacuuming of the mold cavity before the coil is cast, but also improves the uniformity of the cast high-voltage coil, increases the filling coefficient, and saves material. Furthermore, the use of multiple diversion pipes with the same path as the coil arrangement facilitates the simultaneous and equal-flow injection of epoxy resin into the coil casting mold. This ensures the epoxy resin is evenly poured onto the high-voltage coil inside the mold, and the casting liquid level rises synchronously, improving the integrity and uniformity of the epoxy resin protective layer after casting the high-voltage coil. 2. The present invention can perform multiple purification processes on the air drawn into the vacuum pump through the setting of the purification component, thereby improving the protection effect of the equipment; and through the cooperation of the liquid cooling pump and the coolant in the slot at the top of the turntable, the forming rate of the coil inside the coil casting mold can be accelerated; the required cooling and mold opening time can be shortened, thereby improving the working efficiency of casting high voltage coils. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a partial structural diagram of the present invention; Figure 4 This is a schematic diagram of a partial structure of the present invention from another perspective; Figure 5 This is a schematic diagram of the structure of the casting machine after dismantling. Figure 6 This is a schematic diagram of the drive component structure of the present invention; Figure 7 This is a schematic diagram of the mounting base and coil casting mold structure of the present invention; Figure 8 This is a schematic diagram of the lower structure of the mounting base of the present invention; Figure 9 This is a schematic diagram of the moving mechanism and diversion mechanism of the present invention; Figure 10 This is a schematic diagram of the moving mechanism and diversion mechanism of the present invention from another perspective; Figure 11 This is a schematic diagram of the moving mechanism and purification component structure of the present invention; Figure 12 This is a schematic diagram of the diversion bucket, fixing ring, and suction pipe structure of the present invention; Figure 13 This is a schematic diagram of the lower part of the diversion bucket structure of the present invention; Figure 14 This is a cross-sectional view of the movable seat and diversion bucket structure of the present invention; Figure 15 This is a cross-sectional view of the diversion bucket, fixed pipe, and connecting tube structure of the present invention; Figure 16 This is a cross-sectional view of the suction tube and connecting cannula structure of the present invention.

[0016] The components in the diagram are numbered as follows: 1. Turntable; 2. Rotating plate; 3. Support; 4. Linear lifting motor; 5. Casting machine; 6. Mounting base; 7. Coil casting mold; 8. Mold cover; 9. Diverter hopper; 10. Fixed pipe; 11. Connecting pipe; 12. Dual-axis motor; 13. Lead screw; 14. Moving seat; 15. Connecting frame; 16. Filter box; 17. Suction pipe; 18. Purification tank; 19. Air guide pipe; 20. Diverter pipe; 21. Stabilizing rod; 22. Return spring; 23. Suction pipe; 24. Suction port; 25. Fixed plate; 26. Filter screen; 27. Push rod; 28. Abutment ball; 29. ​​Return spring; 30. Sealing block; 31. Servo motor; 32. Drive gear; 33. Internal gear ring; 34. Liquid cooling pump. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Example 1: See Figures 1 to 16A high-voltage coil casting device based on a dry-type transformer includes a turntable 1, a rotating plate 2 horizontally rotatable in a slot at the top of the turntable 1, a support 3 fixedly located in the middle of the turntable 1, and a linear lifting motor 4 located at the top of the support 3. A support frame is horizontally fixed to a lifting seat on one side of the linear lifting motor 4, and a casting machine 5 for casting high-voltage coils is mounted on the support frame. The injection pipe at the bottom of the casting machine 5 extends to the bottom of the support frame. Circular openings are provided on the top periphery of the turntable 2, and mounting seats 6 are provided at the top of the circular openings. An inner mold tube for forming the inner ring of a high-voltage coil is vertically fixed to the center of the top surface of the mounting base 6; coil casting molds 7 are slidably mounted on both sides of the top of the mounting base 6, and a moving mechanism for opening and closing the coil casting molds 7 is provided in the center of the mounting base 6; a mold cover 8 is provided on the top of the coil casting mold 7, and a flow-diverting mechanism for diverting the casting liquid and for vacuuming the inside of the coil casting mold 7 is provided above the mold cover 8; a drive assembly for rotating the rotating plate 2 is provided on the bracket 3; the flow-diverting mechanism includes a flow-diverting hopper 9 located above the mold cover 8, and a mounting plate 2. The diversion hopper 9 has a fixed tube 10 at the top opening, a connecting tube 11 vertically sealed and movable inside the fixed tube 10, and a return assembly sleeved on the upper part of the connecting tube 11. The diversion hopper 9 is inverted, and a diversion cavity is opened in the inner wall of the diversion hopper 9. Multiple diversion tubes 20 are vertically connected to the bottom periphery of the diversion hopper 9, and the bottom end of the diversion tube 20 penetrates the mold cover 8. The lower parts of both sides of the fixed tube 10 are horizontally fixed and connected to suction tubes 23 for vacuuming inside the coil casting mold 7. The outer ends of the suction tubes 23 are all connected to... A purification component for air filtration; a sealing ring is fixed to the inner end of the suction tube 23, and the inner wall of the sealing ring is sealed and fitted to the outer wall of the lower part of the connecting tube 11; a sealing component is provided at the inner end of the suction tube 23; through the cooperation of the coil casting mold 7 with the moving mechanism and the diversion mechanism, the working efficiency of casting high-voltage coils is improved, which not only enables the vacuuming operation inside the mold cavity to be quickly realized before casting the coil inside the mold; but also improves the uniformity of the formed high-voltage coil after casting, and also improves the filling coefficient and saves materials.

[0019] In this invention, the stabilizing mechanism includes a dual-axis motor 12 located in the middle of the mounting base 6, lead screws 13 coaxially fixed to both ends of the dual-axis motor 12, a movable seat 14 sleeved on the lead screws 13, and a connecting frame 15 installed on the outer top of the movable seat 14. The helical directions of the two lead screws 13 are opposite. Stabilizing openings for the movable seat 14 and lead screws 13 to extend are provided on both sides of the mounting base 6. The bottom surface of the connecting frame 15 slides against the top of the mounting base 6, and both sides of the top of the connecting frame 15 are provided with supporting arc plates connected to the coil casting mold 7. The sealing assembly includes a cross rod on the inner wall of the suction tube 23, a fixing plate 25, a filter screen plate 26, a top rod 27 laterally movable through the middle of the cross rod, and an abutment ball 28 fixed to the inner end of the top rod 27. The fixing plate 25... Multiple through-holes are equidistantly opened on one side of the circumference; and a return spring 29 is movably sleeved on the top rod 27 between the abutting ball 28 and the cross rod. The filter screen plate 26 is located inside the fixed plate 25, and the cross rod is located inside the filter screen plate 26. Multiple sealing blocks 30 for sealing the through-holes are fixedly connected to the outer circumference of the filter screen plate 26, and the outer end of the top rod 27 is fixedly connected to the inner side of the filter screen plate 26. Under the action of the diversion mechanism, it is convenient to inject epoxy resin liquid into the coil casting mold 7 at the same flow rate, so that the epoxy resin liquid can be evenly poured onto the high-voltage coil inside the high-voltage coil casting mold 7, and the pouring liquid level inside the coil casting mold 7 can rise synchronously, improving the integrity and uniformity of the epoxy resin protective layer after the high-voltage coil is poured.

[0020] Example 2: The technical solution is basically the same as that of Example 1, except that, as Figure 6 , Figure 7 , Figure 8 , Figure 14 and Figure 15 As shown, the purification assembly includes a filter box 16 located on the top surface of the lower frame of the connecting frame 15, an exhaust pipe 17 vertically connected to the top of the filter box 16, a horizontal pipe connected to the bottom of the outer end of the filter box 16, and a purification tank 18 located at the outer end of the horizontal pipe. Both sides of the outer end of the purification tank 18 are connected to air guide pipes 19. The movable base 14 has mounting cavities on both sides, and each mounting cavity contains a miniature vacuum pump connected to the air guide pipes 19. The top end of the exhaust pipe 17 is fixedly connected to the outer end of the suction pipe 23. The filter box 16 has a double-layered dust filter screen, and the purification tank 18 has a single layer of absorbent cotton screen. Through the arrangement of the purification assembly, the air drawn into the vacuum pump can undergo multiple purification processes, improving the protection effect on the equipment.

[0021] In this invention, the return assembly includes an elliptical ring plate fixedly sleeved on the upper part of the connecting tube 11, multiple guide holes opened on the periphery of the top surface of the elliptical ring plate, and a stabilizing rod 21 vertically movably disposed inside the guide holes. The bottom end of the stabilizing rod 21 is fixedly connected to the top surface of the fixed tube 10, and an anti-detachment block is fixedly connected to the top end of the stabilizing rod 21. A return spring 22 is movably sleeved on the stabilizing rod 21 below the elliptical ring plate. The upper part of the outer wall of the connecting tube 11 located inside the fixed tube 10 is provided with a suction port 24 that cooperates with the suction tube 23, and the suction port 24 is a wide-mouth structure facing outward. With the setting of the return assembly, after the connecting tube 11 loses the pressure of the injection tube, it will quickly rebound and reset under the action of the return spring 22, waiting for the next docking operation. When the connecting tube 11 rebounds, the impact of the elliptical ring plate and the anti-detachment block at the top end of the stabilizing rod 21 can shake the injection liquid on the inner wall of the suction port 24 off.

[0022] In this invention, the drive assembly includes a servo motor 31 located on one side of the bracket 3, a drive gear 32 mounted on the bottom end of the drive shaft of the servo motor 31, and an internal gear ring 33 fixedly connected to the upper part of the inner ring of the rotating plate 2. The drive gear 32 meshes with the internal gear ring 33 for transmission. Liquid cooling pumps 34 are installed at both the front and rear ends inside the mounting base 6. Cooling chambers are opened in the inner wall of the coil casting mold 7, and serpentine heat dissipation pipes are provided inside the cooling chambers. The liquid outlet end of the serpentine heat dissipation pipe extends through a circular opening into the slot of the turntable 1, and the liquid inlet end of the serpentine heat dissipation pipe is fixedly connected to the liquid outlet end of the liquid cooling pump 34. Coolant is poured into the slot of the turntable 1. The liquid pump 34 extends... The coolant is introduced into the slot of the turntable 1; the drive assembly is started to rotate the turntable 2, which facilitates the transfer of the completed coil casting mold 7 from directly below the casting machine 5, and can move the next uncast coil casting mold 7 to below the casting machine 5 to wait for casting; the liquid cooling pump 34 is started to draw coolant from the slot at the top of the turntable 1 and deliver it to the heat dissipation coil inside the inner wall of the coil casting mold 7. When the coolant continuously passes through the heat dissipation coil, it can accelerate the forming rate of the coil inside the coil casting mold 7; it can shorten the required cooling and mold opening time, thereby improving the working efficiency of casting high-voltage coils.

[0023] Working principle: In this embodiment, the present invention also proposes a method for using a high-voltage coil casting device based on a dry-type transformer, including the following steps: Step 1: First, connect the linear lifting motor 4, casting machine 5, servo motor 31, dual-axis motor 12, vacuum pump, and liquid cooling pump 34 of this device to the external control equipment via wires. Then, fill the annular groove at the top of the turntable 1 with coolant and add injection molding liquid to the casting machine 5, and heat and keep the injection molding liquid warm. Then, start the dual-axis motor 12 to drive the moving seat 14 to move in opposite directions. The moving seat 14 drives the connecting frame 15 to move in opposite directions, so that the two coil casting molds 7 on the same mounting base 6 can be closed. Step 2: After the coil casting mold 7 is closed, multiple pads are placed inside the closed coil casting mold 7. By placing the pads, the high-voltage coil can be separated from the inner bottom surface of the coil casting mold 7, so that the high-voltage coil can be completely wrapped when the injection molding liquid is poured. Then, the high-voltage coil of the dry transformer is placed into the coil casting mold 7 layer by layer, and the high-voltage coil of the dry transformer is sleeved on the inner mold tube. A pouring interval space is reserved between the inner wall of the high-voltage coil of the dry transformer and the inner mold tube. Step 3: After placing the high-voltage coil, install the mold cover 8 with the diversion mechanism on the top of the coil casting mold 7. Then, start the linear lifting motor 4 to drive the casting machine 5 to descend, and make the bottom injection tube of the casting machine 5 seal the top of the connecting tube 11. Then continue to push the connecting tube 11 down by two centimeters. The descending connecting tube 11 can make the air extraction port 24 on both sides of the connecting tube 11 aligned with the inner end of the suction tube 23. When the air extraction port 24 is aligned with the suction tube 23, the abutting ball 28 will lose the squeezing force of the connecting tube 11. When the abutting ball 28 loses the squeezing force, the return spring 29 will push the abutting ball 28 into the air extraction port 24. When the abutting ball 28 moves inward, it will drive the filter screen plate 26 towards the cross rod through the top rod 27, so that the sealing block 30 on the outer side of the filter screen plate 26 will exit the through hole of the fixing plate 25, thereby opening the suction tube 23. Step four: After the suction pipe 23 is opened, the casting machine 5 is in an uncasting state. Then, the vacuum pump in the moving base 14 is started. Through the cooperation of the vacuum pump and multiple pipes, it is convenient to perform vacuuming operation inside the coil casting mold 7 and vacuuming operation inside the diversion chamber 9. By performing vacuuming operation inside the coil casting mold 7, the uniformity of the high-voltage coil after casting can be improved, and the filling coefficient can be increased and materials can be saved. The purification component can perform multiple purification treatments on the air drawn into the vacuum pump, improving the protection effect of the equipment. Step 5: After performing a vacuuming operation inside the coil casting mold 7, the linear lifting motor 4 is restarted to drive the casting machine 5 to descend a second time. At this time, the descending height of the connecting tube 11 is also two centimeters. During the second descent of the connecting tube 11, not only will the elliptical ring plate that follows the descending connecting tube 11 exert secondary pressure on the return spring 22, increasing the speed and force of the return spring 22's subsequent rebound and reset, but it will also cause the air extraction port 24 on the second descending connecting tube 11 to be misaligned with the port of the suction tube 23. Through the inner wall of the wide opening of its air extraction port 24, the abutment ball 28 is pushed back into the suction tube 23, causing the push rod 27 to push the filter screen plate 26 to reset, and causing the sealing block 30 to re-seal the fixing plate 25. At the same time, the misaligned air extraction port 24 is located below the suction tube 23, which can prevent the injection liquid from dripping from the air extraction port 24 onto the outer wall of the suction tube 23. Step 6: After the air extraction port 24 is offset from the suction pipe 23 and the suction pipe 23 is blocked, the injection molding liquid is injected into the distribution hopper 9 through the cooperation of the casting machine 5 and the connecting tube 11. The injection molding liquid entering the distribution cavity will be injected into the coil casting mold 7 through multiple distribution pipes 20 simultaneously. This allows the epoxy resin liquid to be evenly poured onto the high-voltage coil inside the high-voltage coil casting mold 7, and allows the casting liquid level inside the coil casting mold 7 to rise synchronously, improving the integrity and uniformity of the epoxy resin protective layer in covering the high-voltage coil after casting. Step 7: After the coil casting mold 7 is filled, the linear lifting motor 4 drives the casting machine 5 to rise. After the injection tube at the bottom of the casting machine 5 is pressed down on the connecting tube 11, it will quickly spring back and reset under the action of the return spring 22, waiting for the next docking operation. When the connecting tube 11 springs back, the impact of the elliptical ring plate and the anti-detachment block at the top of the stabilizing rod 21 can shake the injection liquid on the inner wall of the air extraction port 24 down. At the same time, the drive assembly is started to drive the rotating plate 2 to rotate, so that the completed coil casting mold 7 can be moved out from directly below the casting machine 5, and the next uncast coil casting mold 7 can be moved to the bottom of the casting machine 5 to wait for casting. Step 8: While the completed coil casting mold 7 is being moved out from under the casting machine 5, the liquid cooling pump 34 is started to draw coolant from the slot at the top of the turntable 1 and deliver the coolant toward the heat dissipation coil inside the inner wall of the coil casting mold 7. When the coolant continuously passes through the heat dissipation coil, the forming rate of the coil inside the coil casting mold 7 can be accelerated; the required cooling and mold opening time can be shortened, thereby improving the working efficiency of casting high-voltage coils.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-voltage coil casting device based on a dry-type transformer, comprising a turntable, a rotating plate horizontally rotatable in a slot at the top of the turntable, a support fixedly disposed in the middle of the turntable, and a linear lifting motor disposed at the top of the support, characterized in that: A support frame is horizontally fixed to the lifting seat on one side of the linear lifting motor, and a casting machine for high-voltage coil casting is installed on the support frame. Circular openings are provided on the top periphery of the rotating plate, and a mounting seat is provided at the top of each circular opening. An inner mold tube for forming the inner ring of the high-voltage coil is vertically fixed to the center of the top surface of the mounting seat. Coil casting molds are slidably mounted on both sides of the top of the mounting seat, and a moving mechanism for opening and closing the coil casting mold is provided in the center of the mounting seat. A mold cover is provided on the top of the coil casting mold, and a flow-diverting mechanism for diverting the casting liquid and for vacuuming the inside of the coil casting mold is provided above the mold cover. A drive assembly for rotating the rotating plate is provided on the support. The diversion mechanism includes a diversion hopper located above the mold cover, a fixed tube installed at the top opening of the diversion hopper, a vertically sealed connecting tube inserted into the fixed tube, and a return assembly sleeved on the upper part of the connecting tube. The diversion hopper is inverted, and a diversion cavity is formed in the inner wall of the diversion hopper. Multiple diversion tubes are vertically connected to the bottom periphery of the diversion hopper, and the bottom ends of the diversion tubes penetrate the mold cover. The lower parts of both sides of the fixed tube are horizontally fixed and connected to suction tubes for vacuuming inside the coil casting mold. The outer ends of the suction tubes are all connected to purification components for air filtration. The return assembly includes an elliptical ring plate fixedly sleeved on the upper part of the connecting tube, multiple guide holes opened on the periphery of the top surface of the elliptical ring plate, and a stabilizing rod vertically movable inside the guide holes. The bottom end of the stabilizing rod is fixedly connected to the top surface of the fixed tube, and an anti-disengagement block is fixedly connected to the top end of the stabilizing rod. A return spring is movably sleeved on the stabilizing rod below the elliptical ring plate. The inner end of the suction tube is provided with a sealing assembly, which includes a cross rod, a fixed plate, a filter plate, a top rod that is laterally movable through the middle of the cross rod, and an abutment ball fixed to the inner end of the top rod, all located on the inner wall of the suction tube. The fixed plate has multiple through holes equidistantly opened on one side of its periphery. A return spring is movably sleeved on the top rod between the abutment ball and the cross rod. The filter plate is located inside the fixed plate, the cross rod is located inside the filter plate, and multiple sealing blocks for sealing the through holes are fixed to the periphery of the outer side of the filter plate. The outer end of the top rod is fixed to the inner side of the filter plate. The connecting tubes are all provided with air extraction ports on the upper part of the outer wall inside the fixed tube, which cooperate with the suction tube, and the air extraction ports are wide-mouth structures facing outwards.

2. The high-voltage coil casting device based on a dry-type transformer according to claim 1, characterized in that: The inner end of the suction tube is fixed with a sealing ring, and the inner wall of the sealing ring is sealed and fitted with the outer wall of the lower part of the connecting tube.

3. The high-voltage coil casting device based on a dry-type transformer according to claim 1, characterized in that: The moving mechanism includes a dual-axis motor located in the middle of the mounting base, lead screws coaxially fixed to both ends of the dual-axis motor, a moving seat sleeved on the lead screws, and a connecting frame installed on the outer top of the moving seat. Stable openings for the moving seat and lead screws to extend are provided on both sides of the mounting base. The bottom surface of the connecting frame slides against the top of the mounting base, and the top two sides of the connecting frame are provided with support arc plates connected to the coil casting mold.

4. The high-voltage coil casting device based on a dry-type transformer according to claim 3, characterized in that: The purification assembly includes a filter box located on the top surface of the lower frame of the connecting frame, an air extraction pipe vertically connected to the top of the filter box, a horizontal pipe connected to the bottom of the outer end of the filter box, and a purification tank located at the outer end of the horizontal pipe. Both sides of the outer end of the purification tank are connected to air guide pipes. Both sides of the interior of the movable seat are provided with mounting cavities, and a miniature vacuum pump connected to the air guide pipe is installed inside the mounting cavity. The top end of the air extraction pipe is fixedly connected to the outer end of the suction pipe.

5. The high-voltage coil casting device based on a dry-type transformer according to claim 4, characterized in that: The filter box is equipped with a double-layered dust filter screen, and the purification tank is equipped with a layer of absorbent cotton screen.

6. The high-voltage coil casting device based on a dry-type transformer according to claim 1, characterized in that: The drive assembly includes a servo motor located on one side of the bracket, a drive gear mounted at the bottom of the servo motor drive shaft, and an internal gear ring fixed to the upper part of the inner ring of the rotating plate. The drive gear meshes with the internal gear ring for transmission.

7. The high-voltage coil casting device based on a dry-type transformer according to claim 3, characterized in that: Liquid cooling pumps are installed at both the front and rear ends inside the mounting base. Cooling chambers are opened in the inner wall of the coil casting mold, and serpentine heat dissipation tubes are installed inside the cooling chambers. The liquid outlet of the serpentine heat dissipation tubes extends into the slot of the turntable through a circular opening. The liquid inlet of the serpentine heat dissipation tubes is fixedly connected to the liquid outlet of the liquid cooling pump. Coolant is filled into the slot of the turntable. The liquid pumping pipe extends into the coolant in the slot of the turntable.

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