A transformer coil vacuum impregnation device

Abstract

The application relates to the field of transformer manufacturing, and discloses a transformer coil vacuum varnish dipping equipment, which comprises a varnish dipping box, the top of the varnish dipping box is hinged with a cover plate, the bottom of the inner wall of the varnish dipping box is elastically mounted with a supporting plate, the outer surface of the supporting plate is fixedly connected with a fixing ring, and the top of the fixing ring is provided with a plurality of groups of undulating grooves; a supporting frame is fixedly connected to the top of the right inner wall of the varnish dipping box, and the inside of the supporting frame is tightly sleeved with two groups of movable rods and springs. The connecting column mounted at the bottom of the movable rod moves on the upper surface of the fixing ring, the connecting column repeatedly abuts against the fixing ring and the undulating grooves, the supporting mechanism elastically supports and compensates the supporting plate and the transformer coil above the supporting plate, so that the supporting plate can continuously vibrate the transformer coil in the longitudinal direction, and the gas in the insulating varnish dipping liquid is discharged.

Description

Technical Field

[0001] This application relates to the field of transformer manufacturing technology, and in particular to a transformer coil vacuum impregnation equipment. Background Technology

[0002] Vacuum impregnation of transformer coils is a crucial manufacturing process. By impregnating the coil with insulating varnish in a vacuum environment, the varnish fully penetrates and cures to form a dense protective layer, which helps improve the coil's mechanical strength and stability, enhances electrical insulation performance, and improves heat dissipation. Existing transformer coil vacuum impregnation equipment typically uses a vacuum pump and connecting pipes to create a vacuum inside the equipment, removing air and preparing the transformer for impregnation. However, the vacuum level inside the equipment decreases over time, causing air in the insulating varnish to escape and generate numerous bubbles—a phenomenon known as "foaming." Current technology mainly uses a built-in motor to drive a turbine and mechanical rod-like components to rotate, mechanically eliminating these bubbles. However, this design undoubtedly increases the complexity of the equipment, raises the cost of maintaining the vacuum level, and fails to effectively guarantee a seal between the motor and the equipment, potentially leading to varnish leakage along the joints. Overall, its practicality and reliability are insufficient. Therefore, a simpler, more effective bubble-eliminating transformer coil vacuum impregnation equipment is urgently needed to address this issue. Summary of the Invention

[0003] This application proposes a transformer coil vacuum impregnation equipment, which has the advantage of good impregnation effect, and solves the problems of complex equipment and limited impregnation effect caused by the "foaming" phenomenon in the prior art.

[0004] To achieve the above objectives, this application adopts the following technical solution: a transformer coil vacuum impregnation equipment, comprising: The impregnation tank has a cover plate hinged to its top, a support plate elastically installed on the bottom of the inner wall of the impregnation tank, a fixing ring fixedly connected to the outer surface of the support plate, and multiple sets of undulating grooves opened on the top of the fixing ring. A support frame is fixedly connected to the top right side of the inner wall of the impregnation tank. The support frame has two sets of movable rods and springs inside the sealed sleeve. The movable rods have openings on both the front and rear sides of their inner ring surfaces. A connecting column is fixedly connected to the bottom of the movable rods. A sliding plate is fixedly fitted onto the outer surface of the connecting column. A piston is provided at one end of the movable rods. A third opening is provided in the middle of the bottom surface of the support frame. The bottom surface of the support frame has two sets of fourth and second openings respectively. A connecting groove is fixedly installed at the bottom of the support frame. A vacuum pump is connected to the impregnation tank via a connecting pipe. This device has been redesigned to effectively eliminate gas in the insulating impregnation solution by utilizing the negative pressure generated by a vacuum pump, significantly improving the impregnation effect. To achieve this, the device is equipped with a support frame installed inside the impregnation tank, which is connected to a connecting pipe. This allows the negative pressure generated by the vacuum pump to act bidirectionally on the inner cavity of the support frame. A movable rod and piston, sealed on the inner wall of the support frame, rotate towards the side closer to the connecting pipe under the negative pressure. Vacuuming is achieved by connecting the inner cavity of the impregnation tank through ports one and two. When the movable rod moves, the connecting column installed at the bottom of the movable rod moves on the upper surface of the fixed ring, causing the connecting column to repeatedly abut against the fixed ring and the undulating groove. The support mechanism provides elastic support and compensation for the support plate and the transformer coil above the support plate, enabling the support plate to drive the transformer coil to vibrate continuously longitudinally, expelling gas from the insulating impregnation solution.

[0005] When the piston moves to the space between port four and port three under negative pressure, it directly connects the connecting pipe and port one through the connecting groove, thereby directly extracting the gas from the impregnation tank cavity. Since the gas pressure at both ends of the piston is balanced at this time, the device is equipped with spring two, which is continuously stretched as the movable rod rotates towards the connecting pipe, generating a rebound force. When the piston loses negative pressure, it pulls the movable rod back, causing it to rotate away from the connecting pipe. When the piston leaves the space between port three and port four and moves away from port four, the piston blocks ports one and four. The direct connection between the connecting groove and the connecting pipe is again subjected to negative pressure suction from the connecting pipe and rotates again toward the side closer to the connecting pipe. During the cyclic reciprocating motion of the movable rod, the sliding plate on the outer surface of the connecting column is driven to reciprocate in a high-frequency circular vibration around the axis of the impregnation box, thereby completely expelling the gas in the insulating impregnation liquid. This design not only saves space and has a simple structure, but also utilizes the negative pressure of the vacuum pump to first expel and then absorb the gas in the insulating impregnation liquid, thereby significantly reducing the impact of the "foaming" phenomenon on the impregnation effect of the transformer coil.

[0006] Preferably, the inner cavity of the impregnation tank is filled with insulating impregnation liquid, the liquid level of which is lower than that of the connecting groove, and the connecting groove is connected to the three-way and four-way ports.

[0007] Preferably, it also includes a support mechanism, the support mechanism including a corrugated pipe fixedly connected between the bottom of the support plate and the bottom of the inner wall of the impregnation tank, a receiving cylinder located inside the corrugated pipe fixedly connected to the bottom of the inner wall of the impregnation tank, a support column fixedly connected to the bottom of the support plate, the support column being adapted to be inserted into the inside of the receiving cylinder, and a spring being movably sleeved inside the receiving cylinder, the two ends of the spring being elastically connected to the support column and the impregnation tank respectively.

[0008] Preferably, one end of the connecting pipe is fixedly connected to the middle of the top surface of the support frame, and the other end of the connecting pipe extends through to the right side of the impregnation tank and is connected to the connecting pipe. A vacuum valve is installed on the outer surface of the connecting pipe.

[0009] Preferably, the top of the support plate has multiple sets of slots, which are circumferentially and equidistantly distributed on the top of the support plate, and a limit ring is fixedly connected to the outer edge of the top of the support plate.

[0010] Preferably, a guide post is fixedly installed on the left side of the inner wall of the impregnation tank, and the two ends of the guide post are respectively adapted to be inserted into the other ends of the two sets of movable rods.

[0011] Preferably, the piston is interference-fitted with the inner wall of the support frame, and the piston is located between port one and port four.

[0012] Preferably, the second spring is movably sleeved on the outer surface of the movable rod, and the two ends of the second spring are elastically connected to the support frame and the piston, respectively.

[0013] Preferably, the support frame is semi-circular in shape, and the movable rod can move in a circle along the inner wall of the support frame.

[0014] The beneficial effects of this invention are as follows: 1. This device has been redesigned to effectively eliminate gas in the insulating impregnation solution by utilizing the negative pressure generated by a vacuum pump, significantly improving the impregnation effect. To achieve this, the device is equipped with a support frame installed inside the impregnation tank, which is connected to a connecting pipe. This allows the negative pressure generated by the vacuum pump to act bidirectionally on the inner cavity of the support frame. A movable rod and piston, sealed on the inner wall of the support frame, rotate towards the side closer to the connecting pipe under the negative pressure. Vacuuming is achieved by connecting the inner cavity of the impregnation tank through ports one and two. When the movable rod moves, the connecting column installed at the bottom of the movable rod moves on the upper surface of the fixed ring, causing the connecting column to repeatedly abut against the fixed ring and the undulating groove. The support mechanism provides elastic support and compensation for the support plate and the transformer coil above the support plate, enabling the support plate to drive the transformer coil to vibrate continuously longitudinally, expelling gas from the insulating impregnation solution.

[0015] 2. Then, when the piston moves to the space between port four and port three under negative pressure, it directly connects the connecting pipe and port one through the connecting groove, thereby directly extracting the gas from the impregnation tank cavity. Since the gas pressure at both ends of the piston is balanced at this time, the device is equipped with spring two, which is continuously stretched when the movable rod rotates towards the connecting pipe, generating a rebound force. When the piston loses negative pressure, it pulls the movable rod back, causing it to rotate away from the connecting pipe. When the piston leaves the space between port three and port four and moves away from port four, the piston blocks port one and port three. Fourthly, the direct connection channel between the connecting slot and the connecting pipe is again subjected to negative pressure suction from the connecting pipe and rotates again towards the side closer to the connecting pipe. During the cyclic reciprocating motion of the movable rod, the sliding plate on the outer surface of the connecting column is driven to reciprocate in a high-frequency circular vibration around the axis of the impregnation box, thereby completely expelling the gas in the insulating impregnation liquid. This design not only saves space and has a simple structure, but also utilizes the negative pressure of the vacuum pump to first expel and then absorb the gas in the insulating impregnation liquid, thereby significantly reducing the impact of the "foaming" phenomenon on the impregnation effect of the transformer coil. Attached Figure Description

[0016] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles of this application in a clear and understandable manner.

[0017] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a three-dimensional rear view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the varnish dipping tank of the present invention; Figure 3 This is a front sectional view of the overall structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A; Figure 5 This is a top sectional view of the support frame and movable rod of the present invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point B; Figure 7 This is a schematic diagram of the structure of the support mechanism, support plate, limiting ring, and fixing ring of the present invention; Figure 8 This is a schematic diagram showing the separation of the support mechanism, support plate, limiting ring, and fixing ring of the present invention; Figure 9 This is a schematic diagram showing the separation of the movable rod, piston, guide post, connecting post, sliding plate, and connecting groove of the present invention.

[0018] The components are as follows: 1. Impregnation tank; 2. Cover plate; 3. Vacuum pump; 4. Connecting pipe; 5. Vacuum valve; 6. Support mechanism; 61. Corrugated pipe; 62. Receiving cylinder; 63. Support column; 64. Spring 1; 7. Support plate; 8. Slot; 9. Limiting ring; 10. Fixing ring; 11. Undulating groove; 12. Support frame; 13. Through port 1; 14. Through port 2; 15. Movable rod; 151. Piston; 16. Guide column; 17. Connecting column; 18. Slide plate; 19. Connecting groove; 20. Through port 3; 21. Through port 4; 22. Spring 2. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Please see Figures 1-9 This embodiment discloses a transformer coil vacuum impregnation equipment, comprising: The impregnation tank 1 has a cover plate 2 hinged to the top of the impregnation tank 1, and a support plate 7 is elastically installed at the bottom of the inner wall of the impregnation tank 1. A fixing ring 10 is fixedly connected to the outer surface of the support plate 7, and multiple sets of undulating grooves 11 are opened on the top of the fixing ring 10. The support frame 12 is fixedly connected to the top of the right side of the inner wall of the impregnation tank 1. The inner sealing sleeve of the support frame 12 is equipped with two sets of movable rods 15 and springs 22. The front and rear sides of the inner ring surface of the movable rods 15 are provided with openings 13. The bottom of the movable rods 15 is fixedly connected to the connecting column 17. The outer surface of the connecting column 17 is fixedly fitted with a sliding plate 18. One end of the movable rods 15 is provided with a piston 151. The middle of the bottom surface of the support frame 12 is provided with an opening 20. The bottom surface of the support frame 12 is provided with two sets of openings 21 and 14. The bottom of the support frame 12 is fixedly installed with a connecting groove 19. Vacuum pump 3, and a connecting pipe 4 is installed between vacuum pump 3 and impregnation tank 1; This device has been redesigned to effectively eliminate gas in the insulating impregnation solution by utilizing the negative pressure generated by the vacuum pump 3, significantly improving the impregnation effect. To achieve this, the device connects a support frame 12 installed inside the impregnation tank 1 with a connecting pipe 4, allowing the negative pressure generated by the vacuum pump 3 to act bidirectionally on the inner cavity of the support frame 12. The movable rod 15 and piston 151, which are sealed on the inner wall of the support frame 12, rotate towards the side closer to the connecting pipe 4 under the action of the negative pressure. The inner cavity of the impregnation tank 1 is evacuated through the first port 13 and the second port 14. When the movable rod 15 moves, the connecting column 17 installed at the bottom of the movable rod 15 moves on the upper surface of the fixed ring 10, causing the connecting column 17 to repeatedly abut against the fixed ring 10 and the undulating groove 11. The support mechanism 6 provides elastic support and compensation for the support plate 7 and the transformer coil above the support plate 7, thereby enabling the support plate 7 to drive the transformer coil to vibrate continuously in the longitudinal direction, expelling the gas in the insulating impregnation solution.

[0021] Then, when piston 151 moves to the space between port 4 21 and port 3 20 under negative pressure, it directly connects to the space between the connecting pipe 4 and port 13 through the connecting groove 19, thereby directly extracting the gas in the cavity of the impregnation tank 1. Since the gas pressure at both ends of piston 151 is balanced at this time, the device is equipped with spring 22, which is continuously stretched when the movable rod 15 rotates towards the side of the connecting pipe 4, generating a rebound force. When piston 151 loses negative pressure, it pulls the movable rod 15 back, causing the movable rod 15 to rotate away from the side of the connecting pipe 4. When piston 151 leaves the space between port 3 20 and port 4 21 and moves away from port 4 21, piston 1... 51. Because the direct connection between the through-hole 13 and through-hole 21, the connecting groove 19 and the connecting pipe 4 are blocked, the negative pressure suction from the connecting pipe 4 is applied again, and the pipe rotates again towards the side closer to the connecting pipe 4. During the cyclic reciprocating motion of the movable rod 15, the sliding plate 18 on the outer surface of the connecting column 17 is driven to reciprocate in a high-frequency circular vibration around the axis of the impregnation box 1, thereby completely expelling the gas in the insulating impregnation liquid. This design not only saves space and has a simple structure, but also utilizes the negative pressure of the vacuum pump 3 to first expel and then absorb the gas in the insulating impregnation liquid, thereby significantly reducing the impact of the "foaming" phenomenon on the impregnation effect of the transformer coil.

[0022] In this embodiment, the inner cavity of the impregnation tank 1 is filled with insulating impregnation liquid, the liquid level of which is lower than that of the connecting groove 19, and the connecting groove 19 is connected to the three-way opening 20 and the four-way opening 21. like Figure 2 As shown in the vacuum pump 3, the insulating impregnation liquid must not be higher than the connecting tank 19 because the support frame 12 needs space to evacuate the inner cavity of the impregnation tank 1 and cannot directly contact the insulating impregnation liquid. Figure 7As shown, the function of the connecting groove 19 is to connect the connecting groove 19 and the space on the side of the inner cavity of the support frame 12 near the spring 22 when the piston 151 enters between the four-port 21 and the three-port 20. At this time, the negative pressure of the connecting pipe 4 can directly act on the inner cavity of the paint impregnation box 1 through the three-port 20, the connecting groove 19 and the four-port 21. At this time, the air pressure at both ends of the piston 151 is balanced and no longer under the action of negative pressure. Therefore, the movable rod 15 can be reset under the pulling force of the spring 22 and disengage from the space between the three-port 20 and the four-port 21.

[0023] In this embodiment, a support mechanism 6 is also included. The support mechanism 6 includes a corrugated pipe 61 fixedly connected between the bottom of the support plate 7 and the bottom of the inner wall of the impregnation tank 1. A receiving cylinder 62 located inside the corrugated pipe 61 is fixedly connected to the bottom of the inner wall of the impregnation tank 1. A support column 63 is fixedly connected to the bottom of the support plate 7. The support column 63 is adapted to be inserted into the inside of the receiving cylinder 62. A spring 64 is movably sleeved inside the receiving cylinder 62. The two ends of the spring 64 are elastically connected to the support column 63 and the impregnation tank 1, respectively. like Figure 3 As shown, the support mechanism 6 provides elastic support for the support plate 7. At the same time, the undulating groove 11 opened at the top of the fixed ring 10 enables the support plate 7 to achieve longitudinal vibration, which is used to eliminate some of the gas in the insulating impregnation liquid. The movable rod 15 drives the connecting column 17 and the sliding plate 18 to rotate around the axis of the impregnation tank 1. When the bottom end of the connecting column 17 passes through the undulating groove 11, the support plate 7 moves upward under the elastic support of the spring 64 and the support column 63 until the undulating groove 11 moves back to the position of abutting against the surface of the fixed ring 10. Then, the support plate 7 moves downward under the limiting action of the connecting column 17.

[0024] In this embodiment, one end of the connecting pipe 4 is fixedly connected to the middle of the top surface of the support frame 12, and the other end of the connecting pipe 4 extends through to the right side of the impregnation tank 1 and is connected to the connecting pipe 4. A vacuum valve 5 is installed on the outer surface of the connecting pipe 4. like Figure 3 As shown, the two ends of the connecting pipe 4 are connected to the support frame 12 and the vacuum pump 3 respectively, so that the negative pressure generated by the vacuum pump 3 can provide the connecting pipe 4 to act on the inner cavity of the support frame 12.

[0025] In this embodiment, the top of the support plate 7 is provided with multiple sets of slots 8, which are distributed equidistantly in a circle on the top of the support plate 7, and a limit ring 9 is fixedly connected to the outer edge of the top of the support plate 7. like Figure 2As shown, when the transformer coil is placed on the upper surface of the support plate 7, the opening of the slot 8 can reduce the contact area between the transformer coil and the support plate 7, thereby increasing the contact area between the insulating varnish of the transformer coil. The limiting ring 9 is used to limit and protect the transformer coil, preventing it from deviating when the support plate 7 drives the transformer coil to move up and down.

[0026] In this embodiment, a guide post 16 is fixedly installed on the left side of the inner wall of the paint impregnation tank 1, and the two ends of the guide post 16 are respectively adapted to be inserted into the other ends of the two sets of movable rods 15. like Figure 2 , Figure 3 As shown, the guide post 16 is used to insert into the other end of the movable rod 15 and provide guiding support for the movable rod 15 to maintain the stable movement of the movable rod 15.

[0027] In this embodiment, the piston 151 is in an interference fit with the inner wall of the support frame 12, and the piston 151 is located between the through port 13 and the through port 21. like Figure 5 As shown, the piston 151 maintains a seal with the inner wall of the support frame 12, thereby enabling rapid response to negative pressure and movement. Figure 5 As shown, port 13 is far from port 4 21, and port 4 21 is closer to port 3 20. When the vacuum pump 3 is turned on, the negative pressure will drive the movable rod 15 and piston 151 to rotate towards the side closer to the connecting pipe 4.

[0028] In this embodiment, spring 22 is movably sleeved on the outer surface of movable rod 15, and the two ends of spring 22 are elastically connected to support frame 12 and piston 151 respectively. like Figure 5 As shown, spring 22 is used to provide a rebound force for the movement of movable rod 15. When piston 151 enters between port 4 21 and port 3 20, the negative pressure loses its effect on piston 151. At this time, the stretched spring 22 can pull piston 151 back to its original position.

[0029] In this embodiment, the support frame 12 is semi-circular in shape, and the movable rod 15 can move in a circle along the inner wall of the support frame 12. like Figure 5 As shown, the movable rod 15 is adapted to be connected to the inner wall of the support frame 12, so that it can rotate freely on the inner wall of the support frame 12.

[0030] Working principle: When this device is in operation: First, open the cover plate 2, place the transformer coil on the upper surface of the support plate 7, then put the insulating impregnation liquid into the inner cavity of the impregnation tank 1 until the liquid level covers the transformer coil, close the cover plate 2, turn on the vacuum pump 3 and vacuum valve 5, and evacuate the inner cavity of the impregnation tank 1 through the connecting pipe 4. Then, as Figure 3 , Figure 5 As shown, the negative pressure generated by the vacuuming begins to act on the inner cavity of the connecting pipe 4 and the support frame 12, and drives the movable rod 15 and the piston 151 to rotate towards the side closer to the connecting pipe 4. The tension spring 22 generates a rebound force. Before the piston 151 passes the port 21, the movable rod 15 drives the connecting column 17 and the sliding plate 18 to rotate around the axis of the impregnation tank 1. When the bottom end of the connecting column 17 passes the undulating groove 11, the support plate 7 moves upward under the elastic support of the spring 64 and the support column 63 until the undulating groove 11 moves back to the position abutting against the surface of the fixed ring 10. Then, the support plate 7 moves downward under the limiting action of the connecting column 17. Figure 2 As shown, at this stage, the support plate 7 will drive the transformer coil to generate longitudinal vibration, thereby eliminating some of the air in the insulating impregnation liquid, allowing the air to escape in the form of bubbles. Finally, as Figure 5 As shown, when the movable rod 15 drives the piston 151 to move between port four 21 and port three 20 under negative pressure, the connecting pipe 4 is directly connected to the inner cavity of the impregnation tank 1 through port three 20, connecting groove 19, port four 21, port one 13, and thus draws in the gas in the inner cavity of the impregnation tank 1. At this time, the gas pressure between the two ends of the piston 151 is balanced, and the movable rod 15 is no longer under negative pressure. It is then reset under the rebound force of spring two 22, causing the piston 151 to gradually move away from between port four 21 and port three 20 and rotate towards the side closer to port one 13. When the piston 151 moves away from port three 20 and port four 21, the movable rod 15 is again subjected to negative pressure suction from the connecting pipe 4, and the movable rod 15 rotates towards the side closer to the connecting pipe 4 until the piston 151... When the movable rod 15 enters between the three ports 20 and the four ports 21, it moves in the opposite direction again under the action of losing negative pressure and the rebound force of the spring 22. This cycle repeats until the vacuum degree inside the impregnation tank 1 reaches the required level. During the reciprocating circular motion of the movable rod 15, it drives the connecting column 17 and the sliding plate 18 to exert forces on the fixed ring 10 and the insulating impregnation liquid inside the impregnation tank 1, respectively. The support plate 7 continues to vibrate longitudinally under the action of the fixed ring 10, the support mechanism 6, and the connecting column 17. At the same time, while the connecting column 17 is making reciprocating circular motion, it drives the sliding plate 18 to perform high-frequency circular vibration, thereby generating high-frequency vibration of the insulating impregnation liquid. This vibration stirs the insulating impregnation liquid, thereby greatly eliminating the gas in it, which escapes in the form of bubbles.

[0031] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A transformer coil vacuum impregnation equipment, characterized in that, include: The immersion tank (1) has a cover plate (2) hinged to the top of the immersion tank (1), and a support plate (7) is elastically installed on the bottom of the inner wall of the immersion tank (1). A fixing ring (10) is fixedly connected to the outer surface of the support plate (7), and multiple sets of undulating grooves (11) are opened on the top of the fixing ring (10). The support frame (12) is fixedly connected to the top of the right side of the inner wall of the impregnation tank (1). The support frame (12) is sealed with two sets of movable rods (15) and springs (22). The movable rods (15) have openings (13) on both the front and rear sides of the inner ring surface. The bottom of the movable rods (15) is fixedly connected to a connecting column (17). The outer surface of the connecting column (17) is fixedly fitted with a sliding plate (18). One end of the movable rods (15) is provided with a piston (151). The middle of the bottom surface of the support frame (12) has an opening (20). The bottom surface of the support frame (12) has two sets of openings (21) and openings (14) respectively. The bottom of the support frame (12) is fixedly installed with a connecting groove (19). A vacuum pump (3) is provided, and a connecting pipe (4) is installed between the vacuum pump (3) and the impregnation tank (1); The piston (151) is in an interference fit with the inner wall of the support frame (12). The piston (151) is located between the first opening (13) and the fourth opening (21). The second spring (22) is movably sleeved on the outer surface of the movable rod (15). The two ends of the second spring (22) are elastically connected to the support frame (12) and the piston (151) respectively.

2. The transformer coil vacuum impregnation equipment according to claim 1, characterized in that, The inner cavity of the impregnation tank (1) is filled with insulating impregnation liquid, the liquid level of which is lower than the connecting groove (19), and the connecting groove (19) is connected to the three-way (20) and the four-way (21).

3. The transformer coil vacuum impregnation equipment according to claim 2, characterized in that, It also includes a support mechanism (6), which includes a corrugated pipe (61) fixedly connected between the bottom of the support plate (7) and the bottom of the inner wall of the impregnation tank (1). The bottom of the inner wall of the impregnation tank (1) is fixedly connected to a receiving cylinder (62) located inside the corrugated pipe (61). The bottom of the support plate (7) is fixedly connected to a support column (63). The support column (63) is adapted to be inserted into the inside of the receiving cylinder (62). A spring (64) is movably sleeved inside the receiving cylinder (62). The two ends of the spring (64) are elastically connected to the support column (63) and the impregnation tank (1) respectively.

4. The transformer coil vacuum impregnation equipment according to claim 3, characterized in that, One end of the connecting pipe (4) is fixedly connected to the middle of the top surface of the support frame (12), and the other end of the connecting pipe (4) extends through to the right side of the impregnation tank (1) and is connected to the connecting pipe (4). A vacuum valve (5) is installed on the outer surface of the connecting pipe (4).

5. A transformer coil vacuum impregnation equipment according to claim 4, characterized in that, The top of the support plate (7) has multiple sets of slots (8), which are equidistantly distributed on the top of the support plate (7). A limit ring (9) is fixedly connected to the outer edge of the top of the support plate (7).

6. The transformer coil vacuum impregnation equipment according to claim 5, characterized in that, A guide post (16) is fixedly installed on the left side of the inner wall of the paint impregnation tank (1). The two ends of the guide post (16) are respectively adapted to be inserted into the other ends of the two sets of movable rods (15).

7. A transformer coil vacuum impregnation equipment according to claim 6, characterized in that, The support frame (12) is semi-circular in shape, and the movable rod (15) can move in a circle along the inner wall of the support frame (12).

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