WO2024050984A1 - Vacuum paraffin dipping apparatus and paraffin dipping method using same - Google Patents

Abstract

Disclosed in the present invention is a vacuum paraffin dipping apparatus. The vacuum paraffin dipping apparatus comprises a dipping cabin, which is an openable sealed cabin body, a coil box configured to place a superconducting coil being arranged in the dipping cabin, and a heating pipe being arranged at the bottom of the coil box; a vacuum generation unit and a paraffin filling unit which communicate with the dipping cabin, the vacuum generation unit being configured to manufacture and maintain a vacuum environment in the dipping cabin, the paraffin filling unit is configured to melt paraffin and deliver the molten paraffin into the coil box, and a paraffin filling pipeline being provided with a communication valve for controlling the opening and closing of the pipeline; and a temperature control unit configured to control the temperature of the heating pipe and the temperature when the paraffin filling unit melts the paraffin. In the present invention, the vacuum generation unit and the paraffin filling unit which are in sealed communication with the dipping cabin are provided, and by means of the characteristic of high fluidity of the molten paraffin, the superconducting coil is fixedly sealed effectively by using the paraffin in a vacuum constant-temperature state, so that the stability of the superconducting coil during boarding service is improved. Further disclosed in the present invention is a paraffin dipping method using the vacuum paraffin dipping apparatus.

Description

Vacuum wax dipping equipment and wax dipping method

This application requires the priority of the Chinese patent application submitted to the China Patent Office on September 5, 2022, with the application number 202211079035. This reference is incorporated into this application.

Technical field

The invention relates to the technical field of superconducting coils, and in particular to a vacuum wax impregnation equipment and a wax impregnation method thereof.

Background technique

Superconducting magnet refers to an electromagnet that uses a second-type superconductor with a high transition temperature and a particularly high critical magnetic field to make a coil at low temperatures. It has no electrical losses due to wire resistance and no loss due to the presence of the iron core. Magnetic loss, so it is widely used in industry and scientific research.

Since superconducting magnets are not only subject to external vibration loads during operation, but also subject to internal Lorentz forces, certain mechanical stabilization measures need to be taken to prevent superconducting strips from causing micro-movements in the windings. For superconducting properties, a commonly used mechanical stabilization measure is to use an epoxy resin impregnated sealing process, that is, liquid epoxy resin is used to fill the gaps inside the superconducting magnet to support the superconducting magnet from the inside.

For the sealing of large superconducting coils commonly used in superconducting maglev trains, due to the large size of the superconducting coils, many internal gaps and complex gap structures, it is difficult to fully fill the interior of the superconducting coils with existing impregnation equipment and processes. , As a result, large superconducting coils are still prone to exercise effects after being sealed, affecting the service effect and life of the superconducting coils.

Therefore, how to effectively seal large-scale superconducting coils to improve the stability of the superconducting coils for on-board service is an urgent problem for those skilled in the art.

Contents of the invention

In view of this, the object of the present invention is to provide a vacuum wax impregnation equipment to effectively seal large-scale superconducting coils, so as to improve the stability of the superconducting coils for on-board service.

Another object of the present invention is to provide a wax dipping method using the above vacuum wax dipping equipment to perform wax dipping and sealing of superconducting coils.

In order to achieve the above objects, the present invention provides the following technical solutions:

A vacuum wax impregnation equipment, including:

An impregnation cabin. The impregnation cabin is an openable sealed cabin. A coil box for placing superconducting coils is provided in the impregnation cabin. A heating tube is provided at the bottom of the coil box;

A vacuum generating unit and a paraffin perfusion unit are connected to the impregnation cabin. The vacuum generating unit is used to create and maintain a vacuum environment in the impregnation cabin. The paraffin perfusion unit is used to melt paraffin and put it through the paraffin perfusion pipeline. The molten paraffin is transported into the coil box, and the paraffin perfusion pipeline is provided with a communication valve for controlling the opening and closing of the paraffin perfusion pipeline;

A temperature control unit is used to respectively control the temperature of the heating tube and the temperature of the paraffin infusion unit when the paraffin is melted.

Preferably, in the above vacuum wax impregnation equipment, the outer surface of the paraffin infusion pipeline is wrapped with a heating tape.

Preferably, in the above vacuum wax impregnation equipment, the paraffin infusion unit includes a wax melting basin for placing paraffin and a heater arranged at the bottom of the wax melting basin, and the heater and the temperature control unit are connected by wires. Connected to heat the wax melting basin through the temperature control unit, and one end of the paraffin wax filling pipeline extends into the wax melting basin.

Preferably, in the above vacuum wax impregnation equipment, a first temperature sensor is provided inside the coil box, and a second temperature sensor is provided inside the wax melting basin. The first temperature sensor and the second temperature sensor are connected with each other. The temperature control unit is electrically connected.

Preferably, in the above vacuum wax impregnation equipment, the vacuum generating unit includes a mechanical pump and a bellows, and the mechanical pump communicates with the impregnation chamber through the bellows.

Preferably, in the above vacuum wax impregnation equipment, the impregnation cabin is provided with an observation window for observing the inside of the impregnation cabin.

A wax dipping method using the above vacuum wax dipping equipment to perform wax dipping and sealing of superconducting coils, including at least the following steps:

Demold pretreatment: Use a release agent to smear the surface of the superconducting coil. After the treatment is completed, the superconducting coil is placed in the coil box in the dipping chamber, and the dipping chamber is closed to ensure that the dipping chamber is seal;

Heating coil box: heating the coil box to a first preset temperature through the temperature control unit, and controlling the temperature in the coil box to maintain the first preset temperature through the temperature control unit;

Vacuuming the impregnation cabin: turning on the vacuum generating unit to vacuum the impregnation cabin until the vacuum degree in the impregnation cabin is greater than the first vacuum degree, and keeping the vacuum generating unit open to maintain the desired Describe the degree of vacuum in the impregnation chamber;

Injecting paraffin: melt the paraffin at the second preset temperature through the temperature control unit and the paraffin infusion unit, then cool and maintain the melted paraffin to the first preset temperature, open the communication valve to pass through the vacuum state The dipping chamber allows paraffin to be poured into the coil box in a vacuum state;

Impregnating coil: Keep the superconducting coil impregnated in paraffin for a first preset period of time in a vacuum constant temperature state;

Normal pressure insulation: After impregnating the coil, break the vacuum state of the impregnation chamber until the impregnation chamber returns to normal pressure, and keep the superconducting coil under normal pressure and the first preset temperature for a second preset time. ;

Superconducting coil demoulding: stop heating the coil box, take out the superconducting coil after the molten paraffin in the dipping chamber has cooled, and demould the superconducting coil to complete the superconducting coil. Seal.

Preferably, in the above wax dipping method, the first preset temperature is 95°C-100°C, and the second preset temperature is 105°C-110°C.

Preferably, in the above wax dipping method, the first degree of vacuum is -0.09MPa.

Preferably, in the above wax dipping method, the first preset time length is 1.9h-2.1h, and the second preset time length is 0.9h-1.1h.

It can be seen from the above technical solution that the vacuum wax impregnation equipment provided by the present invention includes an impregnation cabin, a vacuum generating unit, a paraffin perfusion unit and a temperature control unit, wherein the impregnation cabin is an openable sealed cabin. There is a coil box inside, which is used to place superconducting coils and provide a wax dipping place for the superconducting coils. A heating tube is set at the bottom of the coil box to realize heating and constant temperature control of the coil box; the dipping chamber is connected to the vacuum generator The unit and the paraffin perfusion unit are all sealed and connected. The vacuum generating unit is used to create and maintain a vacuum environment in the impregnation chamber. The impregnation chamber after the superconducting coil is placed is evacuated to remove the adsorbed particles in the pores inside the superconducting coil. Gas and moisture make the paraffin impregnation effect of superconducting coils better; the paraffin infusion unit is used to melt the paraffin and transport the molten paraffin to the coil box through the paraffin infusion pipeline, where the paraffin infusion pipeline is sealed with the impregnation chamber Connected, so that one end of the paraffin wax perfusion pipe extends into the impregnation chamber, and the other end extends into the molten paraffin, so that when the vacuum generating unit creates a vacuum environment in the impregnation chamber, the molten paraffin will flow from the paraffin wax perfusion pipe due to negative pressure. The pipeline flows into the coil box in the impregnation chamber, so that the superconducting coil is impregnated with paraffin in the coil box. A communication valve is provided on the paraffin perfusion pipeline to control the opening and closing of the paraffin perfusion pipeline. By controlling the opening and closing of the communication valve, it can The impregnation chamber enters a vacuum state before starting paraffin infusion. At the same time, the amount of paraffin injected can also be controlled.

The temperature control unit is used to separately control the temperature of the heating tube and the temperature of the paraffin infusion unit when melting paraffin. By individually controlling the temperature of the heating tube and the temperature of the paraffin infusion unit when melting paraffin, it can avoid high temperature requirements when melting paraffin. Damage to superconducting coils. The vacuum wax impregnation equipment provided by the present invention creates a vacuum environment for the impregnation cabin by setting a vacuum generating unit. A coil box is placed in the impregnation cabin to provide a place for the superconducting coil to be impregnated with wax. At the same time, a heating tube is set at the bottom of the coil box. By setting the vacuum The generating unit and the heating tube can provide the superconducting coil with a certain temperature immersion environment in a vacuum state. At the same time, the vacuum wax impregnation equipment is equipped with a temperature control unit to respectively control the temperature of the heating tube and the temperature of the paraffin infusion unit when the paraffin is melted. Separate control of the temperature of the heating tube and the temperature of the paraffin infusion unit when melting paraffin can keep the paraffin melting and the superconducting coil impregnation at the optimal temperature, so that the melted paraffin maintains good fluidity to fill the gaps inside the superconducting coil Effective sealing is carried out to improve the wax-impregnating efficiency and wax-impregnating effect of the superconducting coil, so that the performance of the superconducting coil after wax-impregnating and sealing is stable during service.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of vacuum wax impregnation equipment provided by an embodiment of the present invention;

Figure 2 is a schematic flow chart of the wax dipping method provided by an embodiment of the present invention;

Among them, 10 is the impregnation chamber, 110 is the coil box, 120 is the heating tube, 130 is the observation window, 20 is the vacuum generating unit, 210 is the mechanical pump, 220 is the bellows, 30 is the paraffin perfusion unit, and 310 is the paraffin perfusion pipeline. , 320 is a wax melting basin, 330 is a heater, 340 is a communication valve, and 40 is a temperature control unit.

Detailed ways

The core of the present invention is to provide a vacuum wax impregnation device to effectively seal large-scale superconducting coils and improve the stability of the superconducting coils for on-board service.

Another core of the present invention is to disclose a wax dipping method using the above-mentioned vacuum wax dipping equipment to perform wax dipping and solid sealing of superconducting coils.

Hereinafter, embodiments will be described with reference to the drawings. In addition, the embodiments shown below do not limit the invention described in the claims in any way. In addition, all the contents of the structures shown in the following examples are not limited to what is necessary as a solution to the invention described in the claims.

As shown in Figure 1, the vacuum wax impregnation equipment provided by the embodiment of the present invention includes an impregnation cabin 10, a vacuum generating unit 20, a paraffin infusion unit 30 and a temperature control unit 40, wherein the impregnation cabin 10 is an openable sealed cabin. , a coil box 110 is provided in the dipping cabin 10. The coil box 110 is used to place the superconducting coil and provide a wax dipping place for the superconducting coil. A heating tube 120 is provided at the bottom of the coil box 110 to realize the heating of the coil box 110. Heating and required thermostatic control.

The impregnation chamber 10 is sealedly connected to the vacuum generating unit 20 and the paraffin perfusion unit 30. The vacuum generating unit 20 is used to create and maintain a vacuum environment in the impregnation chamber 10, and to perform vacuum processing on the impregnation chamber 10 after placing the superconducting coil. , can remove the gas and moisture adsorbed by the pores inside the superconducting coil, making the paraffin impregnation effect of the superconducting coil better.

It should be noted that the equipment used by the vacuum generating unit 20 to generate vacuum may be a vacuum pump, a Roots blower or a vacuum generator.

The paraffin filling unit 30 is used to melt paraffin, and transport the molten paraffin to the coil box 110 through the paraffin filling line 310, where the paraffin filling line 310 is sealed and connected with the dipping chamber 10, so that the paraffin filling line 310 is One end extends into the impregnation chamber 10, and the other end extends into the molten paraffin, so that when the vacuum generating unit 20 creates the impregnation chamber 10 into a vacuum environment, the molten paraffin will flow into the impregnation chamber from the paraffin filling pipe 310 due to the negative pressure. The coil box 110 in the coil box 110 is so that the superconducting coil is impregnated with paraffin in the coil box 110. The paraffin perfusion pipeline 310 is provided with a connection valve 340 for controlling the on-off of the paraffin perfusion pipeline 310. By controlling the connection valve 340 Opening and closing can start paraffin infusion after the immersion chamber 10 enters a vacuum state. At the same time, the amount of paraffin perfused can also be controlled by controlling the opening and closing of the communication valve 340, so that the molten paraffin can immerse the superconducting coil in the coil box 110.

The temperature control unit 40 is used to respectively control the temperature of the heating tube 120 and the temperature of the paraffin infusion unit 30 when melting paraffin. That is, the temperature control unit 40 is provided with at least two wire interfaces to respectively connect the heating tube 120 and the melting place of paraffin. By adjusting the power at the two wire interfaces of the temperature control unit 40, individual control of the temperatures of the heating tube 120 and the paraffin melting site can be achieved.

It should be noted here that since the preferred temperature for melting paraffin wax is higher than the maximum temperature that the electronic components in the superconducting coil can withstand, in order to melt the paraffin more fully and quickly, a temperature control unit is required. 40. Adjust the melting temperature of the paraffin wax to be higher than the temperature when the superconducting coil is impregnated, so as to avoid the problem of damaging the superconducting coil due to higher temperature requirements when melting the paraffin wax.

The vacuum wax impregnation equipment provided by the present invention creates a vacuum environment for the impregnation cabin 10 by setting the vacuum generating unit 20. The coil box 110 is placed in the impregnation cabin 10 to provide a place for the superconducting coil to be impregnated with wax. At the same time, a heating device is provided at the bottom of the coil box 110. The tube 120, by providing the vacuum generating unit 20 and the heating tube 120, can provide the superconducting coil with an impregnation environment of a certain temperature in a vacuum state. At the same time, the vacuum wax impregnation equipment is provided with a temperature control unit 40 to respectively control the temperature and temperature of the heating tube 120. By individually controlling the temperature of the heating tube 120 and the temperature of the paraffin filling unit 30 when melting paraffin, the paraffin melting process and the superconducting coil impregnation process can both be at optimal temperatures, so that The melted paraffin maintains good fluidity to effectively seal the gaps inside the superconducting coil, improves the wax dipping efficiency and wax dipping effect of the superconducting coil, and makes the superconducting coil after wax dipping and sealing have stable performance during service.

Considering that when the paraffin is transported to the coil box 110 through the paraffin filling pipe 310, it will be cooled to a certain extent in the paraffin filling pipe 310 and reduce the fluidity of the molten paraffin, thereby affecting the wax dipping effect of the superconducting coil. In a specific trial embodiment of the present invention, the paraffin injection pipeline 310 is a pipeline with a thermal insulation function to weaken the cooling effect of the melted paraffin in the paraffin injection pipeline 310. The insulation method of the paraffin injection pipeline 310 is: Lay an insulation layer or wrap and cover the heating tape on the outside of the paraffin injection pipeline 310. In the embodiment of the present invention, it is preferable to wrap and cover the heating tape on the outside of the paraffin injection pipeline 310. Before paraffin injection, open the heating tape and heat it in advance to ensure the paraffin injection. The temperature of the pipeline 310 prevents the molten paraffin from cooling and condensing in the paraffin filling pipeline 310 .

Further, in the vacuum wax impregnation equipment provided by the embodiment of the present invention, the paraffin infusion unit 30 includes a wax melting basin 320 for placing paraffin and a heater 330 disposed at the bottom of the wax melting basin 320. The heater 330 and the temperature control unit 40 is connected by wires to heat the wax melting basin 320 through the temperature control unit 40, and one end of the paraffin wax perfusion pipeline 310 extends into the interior of the wax melting basin 320, so that when the wax melting basin 320 melts paraffin, the paraffin wax perfusion pipeline 310 extends into One end of the melted wax basin 320 is kept in a sealed state, so that the melted paraffin can smoothly enter the impregnation chamber 10 in a vacuum state under the action of negative pressure.

Based on the above embodiment, a first temperature sensor is provided inside the coil box 110 for detecting the temperature of the coil box 110 , and a second temperature sensor is provided inside the wax melting basin 320 to detect the temperature of the wax melting basin 320 . The first temperature sensor and the second temperature sensor are both electrically connected to the temperature control unit 40 to feed back the temperature signal to the temperature control unit 40. During the impregnation of the superconducting coil, the temperature control unit 40 is set The immersion temperature of the coil box 110 and the heating temperature of the melted wax basin 320, the first temperature sensor and the second temperature sensor detect the temperature value of the corresponding position and feed back the temperature signal to the temperature control unit 40, the temperature control unit 40 adjusts the power to adjust the coil box 110 and the temperature in the melted wax basin 320 make the melting process of paraffin and the impregnation process of the superconducting coil at the optimal operating temperature, making the impregnation efficiency of the superconducting coil and the performance after impregnation and sealing more stable.

Further, in a specific embodiment of the present invention, the vacuum generating unit 20 includes a mechanical pump 210 and a bellows 220. The mechanical pump 210 is connected and sealed with the impregnation chamber 10 through the bellows 220. By turning on the mechanical pump 210, the impregnation chamber 10 is manufactured. vacuum environment, and maintain the vacuum environment inside the impregnation chamber 10 by continuously turning on the mechanical pump 210.

In order to more clearly observe the process of the superconducting coil being impregnated with wax inside the impregnation chamber 10, in a specific embodiment of the present invention, the impregnation chamber 10 is provided with an observation window 130 for observing the interior of the impregnation chamber 10.

As shown in Figure 2, the present invention also provides a wax dipping method for vacuum wax dipping of superconducting coils. The wax dipping method uses the vacuum wax dipping equipment provided in any of the above embodiments to perform wax dipping of superconducting coils. The wax dipping method at least includes the following steps:

S01: Demold pretreatment: Use a release agent to smear the surface of the superconducting coil. After the treatment is completed, place the superconducting coil in the coil box 110 in the impregnation chamber 10, and close the impregnation chamber 10 to ensure the sealing of the impregnation chamber 10;

S02: Heating the coil box: Heating the coil box 110 to the first preset temperature through the temperature control unit 40, and controlling the temperature in the coil box 110 to maintain the first preset temperature through the temperature control unit;

S03: Vacuum the impregnation chamber: turn on the vacuum generating unit 20 to vacuum the impregnation chamber 10 until the vacuum degree in the impregnation chamber 10 is greater than the first vacuum degree, and keep the vacuum generating unit open to maintain the pressure inside the impregnation chamber 10 degree of vacuum;

S04: Inject paraffin: melt the paraffin at the second preset temperature through the temperature control unit 40 and the paraffin infusion unit 30, then cool and maintain the melted paraffin to the first preset temperature, open the communication valve 340 to pass through the vacuum state. The impregnation chamber 10 allows paraffin to be poured into the coil box 110 in a vacuum state;

It should be noted that the second preset temperature is higher than the first preset temperature, so that the paraffin wax can be quickly and fully melted at a higher temperature, while the melted paraffin wax is cooled and maintained to the first preset temperature. The purpose is to transport the molten paraffin at the first preset temperature to the impregnation chamber 10 for impregnation of the superconducting coil, thereby ensuring the paraffin melting efficiency while preventing the paraffin temperature in the molten state from being too high and damaging the superconducting coil. of electronic devices.

S05: Dip coil: Keep the superconducting coil dipping in paraffin for the first preset time under vacuum and constant temperature;

S06: Normal pressure insulation: After impregnating the coil, break the vacuum state of the impregnation chamber 10 until the impregnation chamber 10 returns to normal pressure, and keep the superconducting coil under normal pressure and the first preset temperature for the second preset time;

S07: Demold the superconducting coil: stop heating the coil box 110, take out the superconducting coil after cooling the molten paraffin in the dipping chamber 10, and demould the superconducting coil to complete the solid sealing of the superconducting coil.

Further, in steps S02 and S04, since the highest temperature that some electronic components in the superconducting coil can withstand is 100°C, the first preset temperature is 95°C-100°C, and preferably the first preset temperature is 95°C. ℃, and the temperature required for melting paraffin should be higher than the first preset temperature to accelerate the melting of paraffin. In one embodiment of the present invention, the second preset temperature is 105°C-110°C. Preferably, the second preset temperature is 110℃.

Further, in step S03, the first vacuum degree is -0.09MPa.

Further, in step S05 and step S06, the first preset time length is 1.9h-2.1h, preferably the first preset time length is 2.0h, and the second preset time length is 0.9h-1.1h, preferably the second preset time length The duration is 1.0h.

The terms “first” and “second” in the description and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than describing a specific sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not configured with the listed steps or units, but may include steps or units that are not listed.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A vacuum wax impregnation equipment, characterized by including:

   Impregnation cabin (10). The impregnation cabin (10) is an openable sealed cabin. A coil box (110) for placing a superconducting coil is provided in the impregnation cabin (10). The coil box (110) A heating tube (120) is provided at the bottom;

   A vacuum generating unit (20) and a paraffin perfusion unit (30) are connected to the impregnation cabin (10). The vacuum generating unit (20) is used to create and maintain a vacuum environment in the impregnation cabin (10), so The paraffin injection unit (30) is used to melt paraffin and transport the molten paraffin to the coil box (110) through the paraffin injection pipeline (310). The paraffin injection pipeline (310) is provided with a device for controlling The connecting valve (340) for opening and closing the paraffin injection pipeline (310);

   Temperature control unit (40), the temperature control unit (40) is used to respectively control the temperature of the heating tube (120) and the temperature of the paraffin wax infusion unit (30) when the paraffin is melted.
2. The vacuum wax impregnation equipment according to claim 1, characterized in that the paraffin wax infusion pipeline (310) is wrapped and covered with heating tape on the outside.
3. The vacuum wax impregnation equipment according to claim 1, characterized in that the paraffin wax infusion unit (30) includes a wax melting basin (320) for placing paraffin and a heating device disposed at the bottom of the wax melting basin (320). The heater (330) is connected to the temperature control unit (40) through wires to heat the wax melting basin (320) through the temperature control unit (40). The paraffin wax perfusion tube One end of the road (310) extends into the melted wax basin (320).
4. The vacuum wax impregnation equipment according to claim 3, characterized in that a first temperature sensor is provided inside the coil box (110), a second temperature sensor is provided inside the wax melting basin (320), and the third temperature sensor is provided inside the wax melting basin (320). A temperature sensor and the second temperature sensor are electrically connected to the temperature control unit (40).
5. The vacuum wax impregnation equipment according to claim 1, characterized in that the vacuum generating unit (20) includes a mechanical pump (210) and a bellows (220), and the mechanical pump (210) passes through the bellows (220). 220) communicates with the impregnation chamber (10).
6. The vacuum wax impregnation equipment according to claim 1, characterized in that the impregnation cabin (10) is provided with an observation window (130) for observing the inside of the impregnation cabin (10).
7. A wax dipping method using the vacuum wax dipping equipment provided in any one of claims 1 to 6 to perform wax dipping and sealing of superconducting coils, characterized in that it at least includes the following steps:

   Release pretreatment: use a release agent to smear the surface of the superconducting coil. After the treatment is completed, place the superconducting coil in the coil box (110) in the impregnation chamber (10), and close the impregnation chamber. (10) to ensure the sealing of the impregnation chamber (10);

   Heating coil box: Heating the coil box (110) to the first preset temperature through the temperature control unit (40), and controlling the temperature inside the coil box (110) through the temperature control unit (40) Maintain at the first preset temperature;

   Vacuuming the impregnation cabin: turning on the vacuum generating unit (20) to vacuum the impregnation cabin (10) until the vacuum degree in the impregnation cabin (10) is greater than the first vacuum degree, and maintain the The opening state of the vacuum generating unit (20) is to maintain the vacuum degree in the impregnation chamber (10);

   Injecting paraffin: melt the paraffin at the second preset temperature through the temperature control unit (40) and the paraffin infusion unit (30), then cool and maintain the melted paraffin to the first preset temperature, and turn on the Connect the valve (340) to allow paraffin to be poured into the coil box (110) in the vacuum state through the impregnation chamber (10) in the vacuum state;

   Impregnating coil: Keep the superconducting coil impregnated in paraffin for a first preset period of time in a vacuum constant temperature state;

   Normal pressure insulation: After impregnating the coil, break the vacuum state of the impregnation chamber (10) until the impregnation chamber (10) returns to normal pressure, and keep the superconducting coil at normal pressure and the first preset temperature. The second preset duration of soaking;

   Demold the superconducting coil: stop heating the coil box (110), take out the superconducting coil after the molten paraffin in the dipping chamber (10) has cooled, and demould the superconducting coil to complete Sealing of the superconducting coil.
8. The wax dipping method according to claim 7, wherein the first preset temperature is 95°C-100°C, and the second preset temperature is 105°C-110°C.
9. The wax dipping method according to claim 7, wherein the first degree of vacuum is -0.09MPa.
10. The wax dipping method according to claim 7, wherein the first preset time length is 1.9h-2.1h, and the second preset time length is 0.9h-1.1h.

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