A drying device for high voltage bushing core

Abstract

The present invention relates to the technical field of electric power equipment manufacturing, and in particular to a drying device for a high-voltage bushing core, which solves the problem of uneven drying and low efficiency of the high-voltage bushing core in the prior art. A drying device for a high-voltage bushing core comprises a vacuum tank, an upper cabinet, a lower cabinet, a sealing cover, an induction heater, a vacuum pump, an adjustable control component and a variable displacement positioning component. The present invention realizes rapid and uniform drying of the high-voltage bushing core through the combination of induction heating and vacuum environment, as well as the dynamic adjustment of the core position, thereby improving the drying efficiency and product quality.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment manufacturing, and in particular to a drying device for a high-voltage bushing core. Background Art

[0002] High-voltage bushings, as key components for connecting medium and high-voltage electrical equipment, should be kept dry during their manufacture and use. For example, the utility model patent technology of a bushing drying device authorized and announced by the China Patent Office on April 30, 2024, with announcement number CN220871293U, includes a box body, a dehumidification mechanism is arranged inside the box body, a box cover is arranged at the top of the box body, channels are opened inside the box cover through the left and right sides, a plurality of air holes are opened at the bottom of the box cover and located inside the box body corresponding to the channel equidistantly from left to right, a valve is arranged inside the air hole near the bottom of the box cover, a switch is arranged at the top of the box cover near the front and right corners, a battery is arranged at the bottom of the box body near the back, and the dehumidification mechanism includes a hot air blower. The use of the hot air blower can accelerate the evaporation of water molecules, speed up the drying speed of the bushing, and improve work efficiency. The air flow inside the box body can be quickly discharged through the air holes in combination with the hot air blower, which effectively improves the dehumidification effect and avoids the occurrence of safety accidents.

[0003] The above-mentioned bushing drying device is aimed at the problem of keeping dry during use, and the drying problem of high-voltage bushings in production is also very important, especially the quality of the internal core is the basis for ensuring the stable operation of the entire bushing. For example, the core of the high-voltage oil-paper capacitor bushing is composed of a metal core and multiple layers of insulating paper tightly wound around it. The moisture content of these insulating paper layers is a key indicator for controlling the quality of the high-voltage bushing, which directly determines the dielectric loss level and service life of the bushing in long-term operation.

[0004] In the manufacturing and use process of the high-voltage bushing core, drying is a crucial step, which aims to completely remove the moisture in the insulating paper and ensure the dryness of the core, including pre-drying before rolling, drying during the rolling process and drying after the rolling is completed. The drying after the rolling is completed is to place the core inside the vacuum drying device. The position of the core inside the drying device is fixed. In this way, during drying, there is uneven drying of the inner and outer layers, which not only reduces the drying efficiency, but also seriously affects the quality and performance of the high-voltage bushing. The aging of the outer layer of insulating paper will cause its insulation performance to deteriorate, and even cause cracks or damage, which will threaten the safe operation of the entire high-voltage bushing. At the same time, the residual moisture in the inner layer of insulating paper will gradually be released during the operation of the high-voltage bushing, increasing dielectric loss and shortening service life. Summary of the invention

[0005] The purpose of the present invention is to provide a drying device for a high-voltage bushing core to solve the following technical problem: since the position of the core in the drying equipment is relatively fixed from the heat source, the outer insulating paper is prone to overheating or even aging during the heating process, while the inner insulating paper is not completely dried due to poor heat transfer.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A drying device for a high voltage bushing core, comprising:

[0008] An upper cabinet and a lower cabinet, wherein a vacuum tank and a sealing cover are arranged inside the upper cabinet, and a pressure relief valve and a vacuum pump for cooperating with the vacuum tank are arranged inside the lower cabinet;

[0009] An induction heating coil is installed inside the vacuum tank, a variable displacement positioning assembly is arranged inside the induction heating coil, and a driving motor for driving the variable displacement positioning assembly to rotate is arranged at the bottom of the inner cavity of the vacuum tank and at the bottom position of the induction heating coil;

[0010] The internal annular array of the variable displacement positioning component has a plurality of cores, each of which is slidably connected to the inside of the variable displacement positioning component through a sliding positioning member, and one side of each core is provided with an adjustable control component connected to the variable displacement positioning component and the output end cooperates with the sliding positioning member.

[0011] As a further solution of the present invention: an induction heating machine is installed on one side of the upper cabinet, the input end of the induction heating coil is electrically connected to the connection end of the induction heating machine, and a heat insulation cover is provided between the variable displacement positioning assembly and the induction heating coil.

[0012] As a further solution of the present invention: a plurality of heat-conducting holes are formed on the outer wall of the heat-insulating cover, and the diameter of the heat-conducting hole on one side away from the induction heating coil is larger than the diameter on the other side.

[0013] As a further solution of the present invention: the variable displacement positioning assembly comprises a vertically arranged central tube and two outer rings symmetrically arranged on the outer ring of the central tube;

[0014] Each outer ring is provided with four fixing plates arranged in an annular array along the central axis of the central tube, and both ends of each fixing plate are connected to a limiting rod through an inclined rod;

[0015] A slideway is provided on one side of the limit rod, and the output shaft of the drive motor is drivingly connected to the end of the central tube.

[0016] As a further solution of the present invention: a central stabilizing plate is arranged at the top center of the vacuum tank, the top end of the central tube is connected to a rotating tube having one end passing through the central stabilizing plate through a shaft sleeve, the central stabilizing plate is connected to the inner wall of the vacuum tank through a plurality of support rods, a rotating joint passing through the sealing cover is arranged on the top of the sealing cover, one end of the rotating joint is connected to a connecting tube, and the other end is connected to a conical tube matched with the inner diameter of the rotating tube, and the outer ring of the conical tube is connected to a sealing gasket.

[0017] As a further solution of the present invention: the sliding positioning member includes two sliding blocks adapted to the slideways, the width of the sliding blocks is the same as the spacing between two adjacent slideways, two adjacent inclined rods are combined to form an eight-shaped shape, and the spacing between the proximal ends of the two inclined rods is the same as the spacing between two adjacent limiting rods;

[0018] The two sliders are connected to each other on one side with a trumpet-shaped positioning sleeve that is adapted to the end of the core body. The end of the positioning sleeve is rotatably connected to the slider. A rotating motor is installed at the bottom center of the bottom slider. The output shaft of the rotating motor is transmission-connected to the adjacent positioning sleeve.

[0019] As a further solution of the present invention: step grooves are sequentially opened from the bottom to the top of the inner wall of the positioning sleeve, and the diameter of one end of the positioning sleeve is larger than the diameter of the core body, and the diameter of the other end is smaller than the diameter of the core body.

[0020] As a further solution of the present invention: the two outer rings are connected by a plurality of fixing columns, and the position of the bottom outer ring is lower than the bottom horizontal plane of the induction heating coil, and the distance between the two outer rings is greater than the length of the core.

[0021] As a further solution of the present invention: a plurality of adjustable control components are arranged on the outer ring of the outer ring at the bottom, and the adjustable control components include an air cylinder, a movable column and an air pipe, one end of the air cylinder passes through the outer ring, and one end of the air cylinder passes through the side wall of the outer ring and extends between the two limit rods, the movable column is arranged inside the air cylinder, and one end is connected to a piston adapted to the inside of the air cylinder, and the other end passes through the air cylinder through a sliding sleeve, one end of the air pipe is connected to the inside of the air cylinder, and the other end is connected to the inside of the center tube.

[0022] As a further solution of the present invention: a limit block with one end passing through the limit rod is provided on one side of the inner part of the slideway, a slope is provided on the side of the limit block close to the central tube, and one side of the limit rod is connected to a plurality of elastic sheets that cooperate with the end of the limit block.

[0023] Beneficial effects of the present invention:

[0024] Through the combination of induction heating and vacuum environment, as well as the dynamic adjustment of the core position, a fast and uniform drying effect is achieved, which improves production efficiency and product quality;

[0025] The combination of the heat insulation cover and the heat conduction holes effectively isolates the heat generated by the induction heating coil, and can evenly transfer the heat to the core, ensuring uniform drying of the core, avoiding the problem of uneven heating of the inner and outer layers caused by traditional fixed-position drying, and improving the overall quality of the high-voltage bushing and the stability and safety of long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 1 It is a structural schematic diagram of the sealing cover and the vacuum tank of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the induction heating machine and the vacuum pump of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the upper cabinet of the present invention;

[0030] Figure 4 It is a schematic structural diagram of the tapered tube and the rotary joint of the present invention;

[0031] Figure 5 It is a structural schematic diagram of the induction heating coil of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the heat insulation cover and the heat conducting hole of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the fixing plate and the limiting rod of the present invention;

[0034] Figure 8 It is a structural schematic diagram of the core body and the positioning sleeve of the present invention.

[0035] In the figure: 1. sealing cover; 2. upper cabinet; 3. vacuum tank; 4. lower cabinet; 5. induction heating machine; 6. pressure relief valve; 7. vacuum pump; 8. induction heating coil; 9. variable displacement positioning assembly; 10. conical tube; 11. rotary joint; 12. connecting pipe; 13. central stabilizing plate; 14. heat insulation cover; 15. central tube; 16. driving motor; 17. heat conduction hole; 18. rotating tube; 19. sliding positioning member; 20. core; 21. air cylinder; 22. air pipe; 23. moving column; 901. outer ring; 902. slideway; 903. fixing plate; 904. inclined rod; 905. limit rod; 906. limit block; 191. rotating motor; 192. positioning sleeve; 193. slider. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1, as Figure 1 As shown, a drying device for a high-voltage bushing core of this embodiment includes:

[0038] An upper cabinet 2 and a lower cabinet 4, wherein a vacuum tank 3 and a sealing cover 1 are arranged inside the upper cabinet 2, and a pressure relief valve 6 and a vacuum pump 7 for cooperating with the vacuum tank 3 are arranged inside the lower cabinet 4;

[0039] refer to Figure 3 As shown, an induction heating coil 8 is installed inside the vacuum tank 3, a variable displacement positioning component 9 is arranged inside the induction heating coil 8, and a driving motor 16 for driving the variable displacement positioning component 9 to rotate is arranged at the bottom of the inner cavity of the vacuum tank 3 and at the bottom position of the induction heating coil 8;

[0040] refer to Figure 6 As shown, the internal annular array of the variable displacement positioning component 9 has a plurality of cores 20, each of the cores 20 is slidably connected to the inside of the variable displacement positioning component 9 via a sliding positioning member 19, and one side of each core 20 is provided with an adjustable control component which is connected to the variable displacement positioning component 9 and whose output end cooperates with the sliding positioning member 19.

[0041] Working principle of the present invention: Figure 1-6As shown, when the high-voltage bushing core needs to be dried, first, the operator places the core 20 inside the variable displacement positioning assembly 9 through the sliding positioning member 19 to ensure that the core is stable and can slide inside the variable displacement positioning assembly 9. Then, the sealing cover 1 is closed, the vacuum pump 7 is started, and the pressure in the vacuum tank 3 is controlled by the pressure relief valve 6 in the lower cabinet 4 to form the required vacuum environment. In the vacuum state, the induction heating coil 8 is started, which generates an alternating magnetic field under the action of high-frequency current, thereby generating eddy currents inside the core 20 to achieve internal heating. At the same time, the driving motor 16 starts to work, driving the variable displacement positioning component 9 to rotate, so that the core 20 is dynamically adjusted inside the induction heating coil 8, changing the relative position between the core 20 and the heat source. The rotation of the variable displacement positioning component 9 will cause the core 20 to generate centrifugal force and move to the edge of the variable displacement positioning component 9. At this time, the core 20 is close to the induction heating coil 8. The higher temperature at this position can quickly dry the outer ring of the core 20. Then, the position of the sliding positioning member 19 is adjusted by the adjustable control component to move it away from the induction heating coil 8, so that the synchronous movement of the core 20 position can be achieved. The position of the core is fine-tuned at different drying time periods and drying degrees to ensure the uniformity of heating. As the drying process proceeds, the moisture inside the core 20 is gradually evaporated and discharged through the vacuum system until the predetermined drying effect is achieved.

[0042] By combining the variable displacement positioning assembly 9 with the induction heating coil 8, the technical solution realizes the dynamic adjustment of the core 20 during the drying process, effectively avoiding the problem of uneven heating of the inner and outer layers caused by traditional fixed position drying. This not only improves the drying efficiency, but also ensures the uniformity of the overall dryness of the core, thereby improving the overall quality of the high-voltage bushing.

[0043] Since the core 20 can dynamically adjust its position during the drying process, the problem of aging of the outer insulating paper caused by being in a high temperature area for a long time is avoided. This helps to maintain the mechanical and insulating properties of the insulating paper and extend the service life of the high-voltage bushing.

[0044] By dynamically adjusting the core position, this technical solution can ensure that the inner insulating paper can be fully heated during the drying process, thereby improving its drying efficiency. This helps to completely remove moisture from the inner insulating paper, reduce dielectric loss during the operation of the high-voltage bushing, and improve its long-term operation stability and safety.

[0045] Embodiment 2, a drying device for a high voltage bushing core body of this embodiment, referring to Figure 5As shown, an induction heating machine 5 is installed on one side of the upper cabinet 2, the input end of the induction heating coil 8 is electrically connected to the connection end of the induction heating machine 5, and a heat insulation cover 14 is arranged between the variable displacement positioning component 9 and the induction heating coil 8. Specifically, through the electrical connection between the induction heating machine 5 and the induction heating coil 8, and the arrangement of the heat insulation cover 14, the induction heating machine 5 provides a high-frequency current to the induction heating coil 8, generates an alternating magnetic field, and then generates eddy currents inside the core 20 to achieve heating. The heat insulation cover 14 can effectively isolate the heat generated by the induction heating coil 8, prevent the heat from being directly transferred to the core 20, and protect it from high temperature.

[0046] Further, refer to Figure 6 As shown, the outer wall of the heat insulation cover 14 is provided with a plurality of heat conduction holes 17, and the diameter of the heat conduction hole 17 on the side away from the induction heating coil 8 is larger than the diameter on the other side. Specifically, through the heat conduction holes 17 provided on the outer wall of the heat insulation cover 14 and the reduced diameter setting of the heat conduction holes 17, the heat can be dissipated more evenly and retained inside the heat insulation cover 14, while avoiding the heat from being directly conducted to the core 20, thereby improving the uniformity of heating, improving the utilization rate of heat, and reducing unnecessary energy loss.

[0047] Further, refer to Figure 7 As shown, the variable displacement positioning assembly 9 includes a vertically arranged central tube 15 and two outer rings 901 symmetrically arranged on the outer ring of the central tube 15;

[0048] Each outer ring 901 is provided with four fixing plates 903 arranged in an annular array along the central axis of the central tube 15, and both ends of each fixing plate 903 are connected to a limiting rod 905 through an inclined rod 904;

[0049] A slideway 902 is provided on one side of the limit rod 905, and the output shaft of the driving motor 16 is drivingly connected to the end of the central tube 15. Specifically, the combination design of the central tube 15 and the outer ring 901 provides stable support and positioning for the core 20, and facilitates dynamic adjustment of the core, thereby ensuring the stability and uniformity of the core during the drying process and improving the drying efficiency.

[0050] Further, refer to Figure 5As shown, a central stabilizing plate 13 is provided at the top center of the vacuum tank 3, the top end of the central tube 15 is connected to a rotating tube 18 having one end passing through the central stabilizing plate 13 through a shaft sleeve, the central stabilizing plate 13 is connected to the inner wall of the vacuum tank 3 through a plurality of support rods, and a rotating joint 11 passing through the sealing cover 1 is provided on the top of the sealing cover 1, one end of the rotating joint 11 is connected to a connecting tube 12, and the other end is connected to a conical tube 10 matched with the inner diameter of the rotating tube 18, and the outer ring of the conical tube 10 is connected to a sealing gasket. Specifically, through the design of the central stabilizing plate 13 and the rotating tube 18, a stable support and transmission path are provided for the rotation of the variable displacement positioning assembly 9, and through the cooperation of the rotating joint 11, the connecting tube 12 and the conical tube 10, the sealed connection and rotation transmission between the vacuum tank 3 and the external environment are realized.

[0051] A drying device for a high voltage bushing core body of this embodiment, referring to Figure 1-8 As shown, the operator places the high-voltage bushing core 20 to be dried inside the variable displacement positioning assembly 9 through the sliding positioning member 19. The sliding positioning member 19 includes two sliders 193 adapted to the slideway 902. These sliders 193 slide stably in the slideway 902 to ensure that the core 20 can be stably placed and dynamically adjusted as needed. Each slider 193 is connected to a trumpet-shaped positioning sleeve 192. The diameter of these positioning sleeves 192 gradually decreases from the bottom to the top. The diameter of one end is larger than the diameter of the core 20, and the diameter of the other end is smaller than the core 20. This design enables the core 20 to be stably clamped in the positioning sleeve 192. A rotating motor 191 is also installed at the bottom of the slider 193 at the bottom. Under the drive of the rotating motor 191, the core 20 can be rotated, thereby ensuring the uniformity of heating of the outer ring as a whole. The output shaft of the rotating motor 191 is connected to the adjacent positioning sleeve 192 in a transmission manner, so that the core 20 can be rotated when needed, further promoting the uniformity of drying.

[0052] Next, close the sealing cover 1 and start the vacuum pump 7. The vacuum pump 7 controls the pressure in the vacuum tank 3 through the pressure relief valve 6 in the lower cabinet 4, and gradually reduces it to the required vacuum level. At the same time, start the induction heating machine 5 on one side of the upper cabinet 2. The induction heating machine 5 provides high-frequency current to the induction heating coil 8. The induction heating coil 8 generates an alternating magnetic field under the action of the current, thereby inducing eddy currents inside the core 20 to achieve internal heating. In order to prevent the heat generated by the induction heating coil 8 from being directly transferred to the variable displacement positioning assembly 9, a heat insulation cover 14 is provided between the two. The outer wall of the heat insulation cover 14 is also provided with a plurality of heat conduction holes 17. The diameters of these heat conduction holes 17 gradually decrease from the side away from the induction heating coil 8 to the side close to it, which not only ensures the moderate dissipation of heat, but also prevents the direct conduction of heat.

[0053] During vacuum and heating, the driving motor 16 starts to work, and its output shaft is connected to the end of the central tube 15 of the variable displacement positioning assembly 9, driving the central tube 15 and the outer ring 901 around it to rotate. A fixing plate 903, a diagonal rod 904 and a limit rod 905 are arranged inside the outer ring 901, and these structures together constitute the sliding track of the sliding positioning member 19. As the variable displacement positioning assembly 9 rotates, the core 20 is dynamically adjusted inside the induction heating coil 8 to change its relative position with the heat source. This dynamic adjustment not only promotes the uniform distribution of heat, but also moves the core 20 to the edge of the variable displacement positioning assembly 9 through the centrifugal force generated. The temperature near the induction heating coil 8 is higher, and the outer ring of the core 20 can be quickly dried.

[0054] Embodiment 3, a drying device for a high voltage bushing core body of this embodiment, referring to Figure 6-8 As shown, the sliding positioning member 19 includes two sliders 193 adapted to the slideways 902, the width of the sliders 193 is the same as the spacing between two adjacent slideways 902, two adjacent inclined rods 904 are combined to form an eight-shaped shape, and the spacing between the proximal ends of the two inclined rods 904 is the same as the spacing between two adjacent limiting rods 905;

[0055] The two sliders 193 are connected to the sides close to each other with a positioning sleeve 192 in the shape of a trumpet and adapted to the end of the core 20. The end of the positioning sleeve 192 is rotatably connected to the slider 193. A rotating motor 191 is installed at the bottom center of the bottom slider 193. The output shaft of the rotating motor 191 is connected to the adjacent positioning sleeve 192. Specifically, the stable sliding and positioning of the core 20 in the variable displacement positioning assembly 9 is achieved through the adaptation design of the slider 193 and the slideway 902. At the same time, the eight-shaped structure formed between the two inclined rods 904 improves the space surplus when the core 20 is initially placed, and improves the convenience and speed of connection. The core 20 first enters between the two inclined rods 904, and the two ends are respectively in contact with the two positioning sleeves 192. Then the slider 193 enters from between the two inclined rods 904 into the slideway 902 of the two limit rods 905, and the quick installation connection can be completed. The stability and flexibility of the core 20 during the drying process and the convenience of installation are improved, which is convenient for dynamic adjustment during the drying process.

[0056] Further, refer to Figure 8 As shown, the inner wall bottom to the inner wall top of the positioning sleeve 192 are provided with step grooves in sequence, the diameter of one end of the positioning sleeve 192 is larger than the diameter of the core 20, and the diameter of the other end is smaller than the diameter of the core 20. Specifically, the step groove design and diameter change of the inner wall of the positioning sleeve 192 realize the stable positioning and clamping of the core 20. The stability of the core during the drying process is ensured, and the core is prevented from falling off or shifting.

[0057] Further, refer to Figure 7 As shown, the two outer rings 901 are connected by a plurality of fixing columns, and the position of the bottom outer ring 901 is lower than the bottom horizontal plane of the induction heating coil 8 , and the distance between the two outer rings 901 is greater than the length of the core 20 .

[0058] Further, refer to Figure 6-8 As shown, several adjustable control components are arranged on the outer ring 901 at the bottom, and the adjustable control component includes a cylinder 21, a moving column 23 and an air pipe 22. One end of the cylinder 21 passes through the outer ring 901, and one end of the cylinder 21 passes through the side wall of the outer ring 901 and extends between the two limit rods 905. The moving column 23 is arranged inside the cylinder 21, and one end is connected with a piston adapted to the inside of the cylinder 21, and the other end passes through the cylinder 21 through a sliding sleeve. One end of the air pipe 22 is connected to the inside of the cylinder 21, and the other end is connected to the inside of the center tube 15. Specifically, through the design of the adjustable control component, the position of the sliding positioning member 19 is accurately controlled, and the dynamic adjustment of the core 20 in the induction heating coil 8 is realized. The flexibility and uniformity of the drying process are improved, and the overall drying effect of the core is ensured.

[0059] Further, refer to Figure 7 As shown, a limit block 906 with one end penetrating the limit rod 905 is provided on one side of the interior of the slide 902, and a slope is provided on the side of the limit block 906 close to the center tube 15, and a plurality of elastic sheets that cooperate with the end of the limit block 906 are connected to one side of the limit rod 905. The design of the limit block 906 and the slope facilitates the slider 193 to quickly enter the slide 902 to form a limit.

[0060] In this embodiment, a drying device for a high-voltage bushing core is used to fine-tune the position of a sliding positioning member 19 through an adjustable control assembly. Each adjustable control assembly includes an air cylinder 21, a moving column 23, and an air pipe 22. One end of the air cylinder 21 passes through the side wall of the outer ring 901 and extends between two limit rods 905. The moving column 23 is arranged inside the air cylinder 21 and passes through the air cylinder 21 through a sliding sleeve. One end of the air pipe 22 is connected to the inside of the air cylinder 21, and the other end is connected to the inside of the center tube 15. By controlling the air pressure change in the air pipe 22, the moving column 23 can be pushed or pulled, thereby driving the slider 193 and the positioning sleeve 192 to slide in the slideway 902, so as to achieve precise adjustment of the position of the core 20.

[0061] During the entire drying process, the moisture inside the core 20 is gradually evaporated and discharged through the vacuum system. The core position is fine-tuned at different drying time periods and drying degrees to ensure uniform heating until the desired drying effect is achieved. After drying is completed, all equipment is turned off, and after the pressure in the vacuum tank 3 returns to normal pressure, the sealing cover 1 is opened to take out the dried core 20.

[0062] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A drying device for a high voltage bushing core, characterized in that: include: An upper cabinet (2) and a lower cabinet (4), wherein a vacuum tank (3) and a sealing cover (1) are arranged inside the upper cabinet (2), and a pressure relief valve (6) and a vacuum pump (7) for cooperating with the vacuum tank (3) are arranged inside the lower cabinet (4); An induction heating coil (8) is installed inside the vacuum tank (3), a variable displacement positioning component (9) is arranged inside the induction heating coil (8), and a driving motor (16) for driving the variable displacement positioning component (9) to rotate is arranged at the bottom of the inner cavity of the vacuum tank (3) and at the bottom of the induction heating coil (8); The internal annular array of the variable displacement positioning component (9) has a plurality of cores (20), each of the cores (20) is slidably connected to the inside of the variable displacement positioning component (9) via a sliding positioning member (19), and one side of each core (20) is provided with an adjustable control component connected to the variable displacement positioning component (9) and having an output end that cooperates with the sliding positioning member (19); The variable displacement positioning assembly (9) comprises a vertically arranged central tube (15) and two outer rings (901) symmetrically arranged on the outer ring of the central tube (15); Each of the outer rings (901) is provided with four fixing plates (903) arranged in an annular array along the central axis of the central tube (15), and both ends of each fixing plate (903) are connected to a limiting rod (905) via an inclined rod (904); A slideway (902) is provided on one side of the limit rod (905), and the output shaft of the drive motor (16) is drivingly connected to the end of the central tube (15); A plurality of adjustable control components are arranged on the outer ring of the outer ring (901) at the bottom, and the adjustable control components include an air cylinder (21), a movable column (23) and an air pipe (22). One end of the air cylinder (21) passes through the outer ring (901), and one end of the air cylinder (21) passes through the side wall of the outer ring (901) and extends to between two limit rods (905). The movable column (23) is arranged inside the air cylinder (21), and one end is connected to a piston adapted to the inside of the air cylinder (21), and the other end passes through the air cylinder (21) via a sliding sleeve. One end of the air pipe (22) is communicated with the inside of the air cylinder (21), and the other end is communicated with the inside of the central tube (15).

2. A drying device for a high voltage bushing core according to claim 1, characterized in that: An induction heating machine (5) is installed on one side of the upper cabinet (2); an input end of the induction heating coil (8) is electrically connected to a connection end of the induction heating machine (5); and a heat insulation cover (14) is provided between the variable displacement positioning assembly (9) and the induction heating coil (8).

3. A drying device for a high voltage bushing core according to claim 2, characterized in that: The outer wall of the heat insulation cover (14) is provided with a plurality of heat conduction holes (17), and the diameter of the heat conduction hole (17) on a side away from the induction heating coil (8) is larger than the diameter on the other side.

4. A drying device for a high voltage bushing core according to claim 1, characterized in that: A central stabilizing plate (13) is arranged at the center of the top of the vacuum tank (3); the top end of the central tube (15) is connected to a rotating tube (18) having one end passing through the central stabilizing plate (13) through a shaft sleeve; the central stabilizing plate (13) is connected to the inner wall of the vacuum tank (3) through a plurality of supporting rods; a rotating joint (11) passing through the sealing cover (1) is arranged at the top of the sealing cover (1); one end of the rotating joint (11) is connected to a connecting tube (12); the other end is connected to a conical tube (10) matching the inner diameter of the rotating tube (18); the outer ring of the conical tube (10) is connected to a sealing gasket.

5. A drying device for a high voltage bushing core according to claim 4, characterized in that: The sliding positioning member (19) comprises two sliding blocks (193) adapted to the slideways (902), the width of the sliding blocks (193) being the same as the spacing between two adjacent slideways (902), the two adjacent inclined rods (904) being combined to form an eight-shaped shape, and the spacing between the proximal ends of the two inclined rods (904) being the same as the spacing between two adjacent limiting rods (905); A horn-shaped positioning sleeve (192) adapted to the end of the core (20) is connected to the sides of the two sliders (193) that are close to each other, the end of the positioning sleeve (192) is rotationally connected to the slider (193), and a rotating motor (191) is installed at the bottom center of the slider (193) at the bottom, and the output shaft of the rotating motor (191) is drivingly connected to the adjacent positioning sleeve (192).

6. A drying device for a high voltage bushing core according to claim 5, characterized in that: Step grooves are sequentially provided on the inner wall bottom to the inner wall top of the positioning sleeve (192); the diameter of one end of the positioning sleeve (192) is larger than the diameter of the core body (20), and the diameter of the other end is smaller than the diameter of the core body (20).

7. A drying device for a high voltage bushing core according to claim 1, characterized in that: The two outer rings (901) are connected via a plurality of fixing columns, and the position of the bottom outer ring (901) is lower than the bottom horizontal plane of the induction heating coil (8), and the distance between the two outer rings (901) is greater than the length of the core (20).

8. A drying device for a high voltage bushing core according to claim 1, characterized in that: A limit block (906) having one end penetrating the limit rod (905) is provided on one side of the slideway (902), and a slope is provided on a side of the limit block (906) close to the center tube (15). One side of the limit rod (905) is connected to a plurality of elastic sheets that cooperate with the end of the limit block (906).

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