A paraffin containment furnace for a vehicle-mounted superconducting magnet coil

Abstract

The application discloses a paraffin solid sealing furnace for a vehicle-mounted superconducting magnet coil, wherein the melting paraffin cabin and the solid sealing cabin are combined into one, and the structure is compact; the paraffin groove is arranged in the solid sealing furnace, the original paraffin pipeline exposed to the environment can be cancelled, the temperature reduction, solidification, blockage and injection of paraffin in the pipeline due to flow can be avoided, the pouring process is smooth and controllable, and a good solid sealing effect is achieved. In terms of temperature control, mainly using air convection to conduct heat transfer, scientifically arranging the electric heating pipe and the turbulence fan, effectively eliminating the temperature gradient inside the coil and the paraffin, and improving the uniformity of the temperature distribution. In terms of pouring control, the vibration exciter arranged below the superconducting coil tray can effectively accelerate the discharge of bubbles inside the coil. In terms of vacuum control, only slight negative pressure in the furnace needs to be maintained, which greatly reduces the performance of the vacuum pump, the sealing requirement of the furnace body, the manufacturing difficulty and the cost.

Description

Technical Field

[0001] This invention relates to the field of maglev transportation technology, and in particular to a paraffin sealing furnace for vehicle-mounted superconducting magnet coils. Background Technology

[0002] As a key component of maglev vehicles, onboard superconducting magnets serve on moving maglev trains. Unlike the service environment of traditional static superconducting magnets, onboard superconducting magnets face scenarios such as acceleration and deceleration, varying speeds, and vibration and impact. Their internal loads exhibit different alternating characteristics under different conditions, which places higher demands on the reliability and stability of onboard superconducting magnets. The superconducting magnet coil (referred to as the coil) is the core component of the onboard superconducting magnet. It contains thin superconducting tape wound inside, with some of the tape suspended. The coil is treated with a paraffin wax sealing process, filling the internal gaps with paraffin wax to improve its reliability and stability.

[0003] A paraffin wax sealing furnace is equipment used to process superconducting magnet coils using a paraffin wax sealing process. The coil is placed in a coil tray within the furnace, while a specific temperature and pressure environment is created inside. Once the coil temperature stabilizes, liquid paraffin is poured into the coil tray, ensuring the coil is fully submerged to achieve the sealing effect. The key technologies in the paraffin wax sealing process are threefold: first, vacuum control within the furnace; second, temperature control of the paraffin wax and coil; and third, control of the paraffin wax pouring. Good vacuum control facilitates the timely removal of air bubbles submerged in the paraffin wax from inside the coil, and also allows for the intake of air from the outside through the air inlet pipe for temperature compensation. Good temperature control ensures good fluidity of the liquid paraffin while preventing damage to coil components due to excessive heat. Good pouring control allows the liquid paraffin to smoothly and fully fill the coil pores and expel air bubbles.

[0004] A high-performance paraffin sealing furnace is beneficial for achieving high-quality paraffin sealing effects, which is of positive significance for improving the reliability and stability of coils.

[0005] Taking an existing paraffin sealing furnace as an example, this paper introduces the technical solution from the perspective of overall structure, and then from the perspectives of vacuum control, temperature control and pouring control.

[0006] Overall structure:

[0007] The overall structure of an existing paraffin wax sealing furnace can be mainly divided into a frame structure, a sealing chamber, a wax melting chamber, air pipelines and valves, a vacuum pump, paraffin wax pipelines and valves, and an electrical control device (not shown in the figure). The frame structure supports the sealing chamber and the wax melting chamber located on the upper and lower layers respectively; the vacuum pump evacuates the sealing chamber through the air pipeline, and after the vacuum pump is turned off, the sealing chamber can be filled with air through the valves on the air pipeline; the lower end of the paraffin wax pipeline is connected to the wax melting chamber, and the upper end extends into the sealing chamber. Paraffin wax in the wax melting chamber can be drawn in and poured into the sealing chamber through the valves on the paraffin wax pipeline.

[0008] The main structure inside the wax melting chamber can be divided into serpentine heating tubes, heat-conducting plates, a paraffin wax tank, and paraffin wax. When the serpentine heating tubes are energized, the heat generated is mainly transferred to the paraffin wax through the heat-conducting plates and the paraffin wax tank via heat conduction. Once the solid paraffin wax reaches its melting point, it melts and stabilizes at a certain temperature.

[0009] The main structure inside the sealed chamber can be divided into a serpentine heating tube, a heat-conducting plate, a coil tray, and a coil. When the serpentine heating tube is energized, the heat generated is mainly transferred to the coil through the heat-conducting plate and the coil tray, thus stabilizing the coil at a certain temperature.

[0010] Vacuum control:

[0011] The solidified chamber is evacuated using a vacuum pump and air pipelines. Depending on the degree of sealing, the absolute pressure inside the chamber is typically at least below 0.1 atmospheres. Creating a vacuum environment within the chamber primarily reduces the effect of air convection heat transfer and facilitates the removal of air bubbles sealed by liquid paraffin during the sealing process. Pressure gauges and valves are installed on the evacuation pipelines; after the vacuum pump is shut off, the chamber can be refilled with air by opening the valves to restore atmospheric pressure.

[0012] Temperature control:

[0013] The temperature control objectives for the wax melting chamber and the solidification chamber are the temperature of the liquid paraffin in the paraffin bath and the temperature of the coil in the coil tray, respectively. Regardless of which temperature is being controlled, it is achieved by adjusting the input voltage of the serpentine heating element. Unattended operation can be achieved using an automated control system, or the temperature can be controlled manually by adjusting the input voltage in manual mode.

[0014] Pouring control:

[0015] Once the temperatures of the liquid paraffin and the coil have stabilized at the specified values, open the valve on the paraffin pipeline. Utilizing the pressure difference between the molten paraffin chamber and the solidification chamber, the liquid paraffin is drawn in and poured into the coil tray within the solidification chamber. After the liquid paraffin has completely submerged the coil, close the valve on the paraffin pipeline; the pouring process is now complete.

[0016] During the pouring process, to prevent the temperature of the liquid paraffin from dropping as it flows through the paraffin pipeline, a heat tracing cable can be wrapped around the pipeline for heat compensation. At the same time, to prevent paraffin from splashing during pouring, the valve opening should be controlled slowly to maintain a slow and steady flow of paraffin.

[0017] The following points illustrate the shortcomings of the existing paraffin sealing furnace.

[0018] Temperature control:

[0019] Heat transfer occurs through conduction, convection, and radiation. The pressure inside existing paraffin-sealed furnaces is relatively low (no higher than 0.1 atmospheres), thus greatly inhibiting convective heat transfer. The primary heat transfer mechanism within the furnace is conduction, supplemented by a certain degree of radiation.

[0020] Heat transfer methods that rely primarily on heat conduction inevitably result in a significant temperature gradient in the heated material, meaning that the temperature is higher in areas close to the heat-conducting plate and lower in areas farther away, leading to uneven temperature distribution in the material.

[0021] Since the heat-conducting plate and coil tray mentioned above are mainly made of metal, their overall heat capacity is relatively large, resulting in significant inertia and lag in their electrothermal conversion. This leads to difficulties in controlling the input voltage of the heating element: under the same alternating input voltage, the temperature fluctuation caused by the heat conduction method is higher than that of the convection method; at the same time, its lag results in a long response time for the control system, which is not conducive to real-time and accurate temperature control.

[0022] For paraffin sealing of coils, the accuracy and stability of temperature control are of higher priority than the heat transfer rate. Therefore, existing paraffin sealing furnaces, which rely primarily on thermal conduction, have relatively poor accuracy and stability in temperature control.

[0023] Pouring control:

[0024] Ideal pouring control should ensure a stable paraffin flow rate and temperature, which facilitates the smooth and gradual wetting of the coil and the expulsion of air bubbles.

[0025] Existing paraffin wax sealing furnaces have separate sealing chambers and melting chambers. When molten paraffin flows through pipes exposed to the external environment, it inevitably cools due to ambient temperature. Although the outer wall of the paraffin wax pipes is wrapped with heating cables, accurately compensating for heat loss during flow is extremely difficult. Excessive temperature compensation results in excessively high liquid paraffin temperatures, potentially exceeding process requirements. Insufficient temperature compensation causes the liquid paraffin to solidify on the inner wall of the pipe, reducing the effective cross-sectional area and increasing overall flow resistance. In extreme cases, this can completely block the pipe. Under the pressure difference between the two ends of the paraffin wax pipe, this can easily cause paraffin wax to spray out at the pouring port, severely disrupting the flow of liquid paraffin in the coil tray. This is highly detrimental to the smooth, gradual wetting of the coil and can quickly trap air bubbles below the liquid level in localized areas, negatively impacting the sealing effect.

[0026] In addition, existing paraffin sealing furnaces do not have video monitoring functions inside. The pouring process inside the furnace can only be observed through a small glass window. Furthermore, the size of the glass window cannot be expanded indefinitely due to the large pressure difference between the inside and outside of the furnace, which causes some inconvenience to users.

[0027] Overall structure:

[0028] The existing paraffin wax sealing furnace has its sealing chamber and melting chamber located on the upper and lower layers of a frame structure, requiring two separate heating systems. External paraffin wax pipes connect the two chambers, resulting in a less compact overall structure. Furthermore, the sealing chamber's location on the upper layer poses significant inconvenience for arranging and removing heavy coils. Summary of the Invention

[0029] In view of this, the present invention provides a paraffin sealing furnace for vehicle-mounted superconducting magnet coils, which improves performance and facilitates the achievement of high-quality paraffin sealing effect.

[0030] To achieve the above objectives, the present invention provides the following technical solution:

[0031] A paraffin sealing furnace for vehicle-mounted superconducting magnet coils includes: a furnace body, a paraffin bath, a coil tray, and a heating system;

[0032] The paraffin bath and the coil tray are disposed inside the furnace body;

[0033] The heating system includes: a main heating system;

[0034] The main heating system includes a turbulence fan and a first electric heating tube arranged on the inner wall of the furnace body.

[0035] Preferably, a plurality of first electric heating tubes are evenly arranged on the inner wall of the furnace body, and the turbulence fan is arranged between the first electric heating tubes and the inner wall of the furnace body.

[0036] Preferably, the furnace body has a bottom surface and a wall surface;

[0037] The coil tray is disposed on the bottom surface of the furnace body, the paraffin wax tank is disposed above the coil tray, the bottom of the paraffin wax tank is provided with a casting pipe, and the turbulence fan and the first electric heating tube are disposed on the wall surface of the furnace body.

[0038] Preferably, the heating system further includes: an auxiliary heating system for the paraffin bath;

[0039] The auxiliary heating system for the paraffin bath includes a second electric heating tube arranged at the bottom of the paraffin bath.

[0040] Preferably, the heating system further includes: a coil tray auxiliary heating system;

[0041] The coil tray auxiliary heating system includes a third electric heating tube arranged at the bottom of the coil tray.

[0042] Preferably, it further includes: a vacuum system;

[0043] The vacuum system includes: a vacuum pump, an extraction pipeline, and an intake pipeline;

[0044] The vacuum pump is connected to the furnace body through the air extraction pipeline;

[0045] The air intake pipe is located in the furnace body.

[0046] Preferably, it further includes: a vibration system;

[0047] The vibration system includes an exciter arranged below the coil tray.

[0048] Preferably, the coil tray is supported on the bottom surface of the furnace body, and the vibrator is mounted on the coil tray support.

[0049] Preferably, it further includes: a front-opening observation window disposed on the furnace body.

[0050] Preferably, it also includes: lighting facilities and a monitoring system disposed inside the furnace body.

[0051] As can be seen from the above technical solution, the paraffin sealing furnace for vehicle-mounted superconducting magnet coils provided by the present invention has the following advantages:

[0052] In terms of overall structure, compared to existing paraffin wax sealing furnaces, this invention combines the wax melting chamber and the sealing chamber into one compact structure. Placing the coil tray below the sealing furnace facilitates the arrangement and removal of heavier coils.

[0053] Regarding vacuum control, compared to existing paraffin sealing furnaces, this invention only requires maintaining a slight negative pressure inside the furnace (e.g., an absolute pressure of 0.9 atmospheres), which greatly reduces the performance requirements of the vacuum pump and the sealing requirements of the furnace body, resulting in lower manufacturing difficulty and cost.

[0054] Regarding temperature control, compared to existing paraffin sealing furnaces, this invention primarily uses air convection for heat transfer. Combined with scientifically arranged electric heating tubes and a turbulence fan, it effectively eliminates the temperature gradient between the coil and the inside of the paraffin, improving the uniformity of its temperature distribution.

[0055] Regarding pouring control, compared to existing paraffin wax sealing furnaces, placing the paraffin wax tank inside the furnace eliminates the need for previously exposed paraffin wax pipelines. This avoids cooling, solidification, blockage, and wax injection at the injection port caused by paraffin wax flow within these pipelines. This results in a smoother and more controllable pouring process, facilitating the gradual and even wetting of the coil by the paraffin wax and the removal of air bubbles, achieving a superior sealing effect. Furthermore, the vibrator positioned below the superconducting coil tray effectively accelerates the removal of air bubbles from within the coil, further enhancing the sealing performance. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 A schematic diagram of the overall external structure of the paraffin sealing furnace provided in an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of the internal structure of the paraffin sealing furnace provided in an embodiment of the present invention;

[0059] Figure 3 This is a partial structural diagram of the paraffin-sealing furnace wall provided in an embodiment of the present invention;

[0060] Figure 4 This is a schematic diagram of the inverted structure of the paraffin tank in the paraffin sealing furnace provided in an embodiment of the present invention;

[0061] Figure 5 This is a schematic diagram of the inverted structure of the coil tray of the paraffin sealing furnace provided in an embodiment of the present invention.

[0062] Among them, 1 is the furnace body, 2 is the front door observation window, 3 is the control panel, 4 is the vacuum pump, 5 is the air extraction pipeline, 6 is the air inlet pipeline, 7 is the bottom surface of the furnace body, 8 is the furnace body wall, 9 is the paraffin wax tank, 10 is the coil tray, 11 is the turbulence fan, 12 is the electric heating tube, 13 is the electric heating tube, 14 is the casting pipeline, 15 is the electric heating tube, 16 is the coil tray support, and 17 is the vibrator. Detailed Implementation

[0063] The technical terms involved in this solution are explained below:

[0064] Vehicle-mounted superconducting magnet: A device that uses superconducting coils and their associated structures to provide a stable static magnetic field for vehicle operation. All of its hardware is mounted on a moving maglev vehicle, and the external environment it is subjected to is dynamically changing.

[0065] Vehicle-mounted superconducting magnet coil: The core component of the vehicle-mounted superconducting magnet, which is wound with superconducting tape to generate a magnetic field.

[0066] Paraffin wax sealing process: A process that uses paraffin wax as a medium and utilizes the physical principle that paraffin wax changes from liquid to solid state through temperature changes to fill gaps and seal the object being sealed.

[0067] This invention provides a paraffin sealing furnace for vehicle-mounted superconducting magnet coils, providing an equipment basis for processing superconducting magnet coils using paraffin sealing technology.

[0068] The basic components of this invention are: a mechanical system, a vacuum system, a heating system, a vibration system, and an auxiliary electrical control system.

[0069] (1) The mechanical system mainly includes the furnace body enclosure structure, coil tray and support structure, paraffin container and support structure, liquid paraffin injection pipeline and valve, etc.

[0070] (2) The vacuum system consists of a vacuum pump, pressure gauges, evacuation pipeline, inlet pipeline, and valves. During operation, the vacuum pump is used to evacuate the furnace, and the valves in the inlet pipeline are adjusted to maintain a certain negative pressure inside the solid-sealing furnace.

[0071] (3) The heating system is divided into three parts: the main heating system, the paraffin bath auxiliary heating system, and the coil tray auxiliary heating system. The main heating system consists of electric heating tubes arranged on the inner wall of the solidification furnace and their associated turbulence fans. It mainly transfers the heat generated by the electric heating tubes to the paraffin bath and the coil tray through the flowing air. The paraffin bath auxiliary heating system consists of electric heating tubes arranged at the bottom of the paraffin container, used for preheating the paraffin or, if necessary, for auxiliary heating. The coil tray auxiliary heating system consists of electric heating tubes arranged at the bottom of the coil tray, used for preheating the coil or, if necessary, for auxiliary heating.

[0072] (4) The vibration system consists of an exciter arranged below the coil tray. When the exciter is working, it transmits the vibration to the coil through the bottom wall of the coil tray.

[0073] (5) The attached electrical control system is used to provide power to the solid seal furnace and to provide related control functions.

[0074] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0075] The paraffin sealing furnace for vehicle-mounted superconducting magnet coils provided in this embodiment of the invention includes: a furnace body 1, a paraffin tank 9, a coil tray 10, and a heating system, the structure of which can be referred to Figure 1 and Figure 2 As shown;

[0076] Among them, the paraffin bath 9 and the coil tray 10 are set inside the furnace body 1;

[0077] The heating system includes: the main heating system;

[0078] The main heating system includes a turbulence fan 11 and a first electric heating tube 12 arranged on the inner wall of the furnace body 1.

[0079] As can be seen from the above technical solutions, the paraffin sealing furnace for vehicle-mounted superconducting magnet coils provided in this embodiment of the invention has the following advantages:

[0080] In terms of overall structure, compared with existing paraffin sealing furnaces, the embodiments of the present invention combine the wax melting chamber (paraffin tank 9) and the sealing chamber (coil tray 10) into one, resulting in a compact structure.

[0081] Regarding pouring control: Compared to existing paraffin wax sealing furnaces, placing the paraffin wax tank 9 inside the furnace body 1 eliminates the need for the original paraffin wax pipelines exposed to the environment. This avoids the cooling, solidification, blockage, and wax injection nozzle spraying caused by the flow of paraffin wax in the aforementioned pipelines. This makes the pouring process smooth and controllable, which is conducive to the smooth and gradual wetting of the coil by paraffin wax and the removal of air bubbles, achieving a good sealing effect.

[0082] Regarding temperature control, compared to existing paraffin sealing furnaces, this invention primarily uses air convection for heat transfer. Combined with scientifically arranged electric heating tubes and a turbulence fan, it effectively eliminates the temperature gradient between the coil and the inside of the paraffin, improving the uniformity of its temperature distribution.

[0083] Regarding vacuum control, compared to existing paraffin sealing furnaces, the embodiments of this invention only require maintaining a slight negative pressure inside the furnace (e.g., an absolute pressure of 0.9 atmospheres), which greatly reduces the performance requirements of the vacuum pump and the sealing requirements of the furnace body, resulting in lower manufacturing difficulty and cost.

[0084] The airflow pattern inside the furnace has a significant impact on temperature uniformity; therefore, the fans should be arranged appropriately to achieve sufficient heat exchange between the paraffin and the coils, resulting in uniform temperature. Preferably, multiple first electric heating tubes 12 are evenly arranged on the inner wall of the furnace body 1, and a turbulence fan 11 is positioned between the first electric heating tubes 12 and the inner wall of the furnace body 1. Its structure can be referenced from [reference needed]. Figure 2 As shown.

[0085] Specifically, the furnace body 1 has a bottom surface 7 and a wall surface 8, the structure of which can be referred to Figure 2 As shown;

[0086] The coil tray 10 is located on the bottom surface 7 of the furnace body, and the paraffin wax tank 9 is located above the coil tray 10 (preferably in the middle of the furnace body 1). A casting pipe 14 is provided at the bottom of the paraffin wax tank 9 (e.g., Figure 4 (Inverted diagram), the turbulence fan 11 and the first electric heating tube 12 are disposed on the furnace wall 8, that is, side heating is adopted. Furthermore, the casting pipe 14 with valve can be disposed at the center of the bottom of the paraffin bath 9, and multiple first electric heating tubes 12 are evenly distributed around the casting pipe 14.

[0087] In this embodiment, the heating system further includes: an auxiliary heating system for the paraffin bath;

[0088] The auxiliary heating system for the paraffin bath includes a second electric heating tube 13 arranged at the bottom of the paraffin bath 9, the structure of which can be referred to Figure 4 The diagram shows the inverted position. During operation, the heat from the second electric heating tube 13 can be transferred to the bottom surface of the paraffin bath 9 through three methods: conduction, convection, and radiation. It can be used for preheating and rapid melting of solid paraffin, as well as for local heat compensation when the paraffin temperature is slightly low.

[0089] Furthermore, the heating system also includes: a coil tray auxiliary heating system;

[0090] The coil tray auxiliary heating system includes a third electric heating tube 15 arranged at the bottom of the coil tray 10, the structure of which can be referred to Figure 5 The diagram shows the inverted state. During operation, the heat generated by the third electric heating tube 15 can be transferred to the bottom surface of the coil tray 10 through three methods: conduction, convection, and radiation. This heat can be used for preheating the coil or for local heat compensation when the coil temperature is slightly low.

[0091] The paraffin sealing furnace for vehicle-mounted superconducting magnet coils provided in this embodiment of the invention further includes a vacuum system, the structure of which can be referred to... Figure 1 As shown;

[0092] The vacuum system includes: a vacuum pump 4, an air extraction line 5, and an air inlet line 6;

[0093] Vacuum pump 4 is connected to furnace body 1 through suction pipe 5; this scheme adopts convection heating, which does not require a high degree of vacuum. It is only necessary to maintain a slight negative pressure inside the furnace (e.g., an absolute pressure of 0.9 atmospheres). Therefore, a low-power vacuum pump can be used, which reduces the performance requirements of the vacuum pump and lowers the cost.

[0094] The air inlet pipe 6 is located on the furnace body 1.

[0095] The paraffin sealing furnace for vehicle-mounted superconducting magnet coils provided in this embodiment of the invention further includes a vibration system, the structure of which can be referred to... Figure 5 As shown;

[0096] The vibration system includes a vibrator 17 arranged below the coil tray 10. When the vibrator 17 is working, it transmits vibration to the coil through the bottom wall of the coil tray 10, which can effectively accelerate the discharge of air bubbles inside the coil and improve the sealing effect.

[0097] Furthermore, the coil tray 10 is mounted on the bottom surface 7 of the furnace body via the coil tray support 16, and the vibrator 17 is mounted on the coil tray support 16. Its structure can be referenced... Figure 5 As shown, five tray supports 16 and exciters 17 can be used, located around the bottom and center of the coil tray 10, respectively, with multiple third electric heating tubes 15 evenly distributed therebetween.

[0098] The paraffin sealing furnace for vehicle-mounted superconducting magnet coils provided in this embodiment of the invention further includes: a front-opening observation window 2 disposed in the furnace body 1. Its structure can be referred to... Figure 1 As shown, this solution uses convection heating, which does not require a high degree of vacuum. The size of the glass window will not be limited by the large pressure difference between the inside and outside of the furnace, unlike existing technologies, thus allowing for easy observation by the user.

[0099] The paraffin wax sealing furnace for vehicle-mounted superconducting magnet coils provided in this embodiment of the invention further includes: lighting facilities and a monitoring system installed inside the furnace body 1, which outputs video signals from the paraffin wax tank and the inside of the coil tray to a display outside the sealing furnace for user observation. Temperature sensors are arranged at key locations inside the furnace to monitor the temperature distribution in detail, allowing the user to decide on the pouring timing.

[0100] The following is a further description of this solution with reference to specific embodiments:

[0101] The paraffin sealing furnace of this invention has a box-type structure, such as... Figure 1 and Figure 2The main components shown can be divided into: furnace body 1, front-opening observation window 2, control panel 3, vacuum pump 4, exhaust pipe 5 (including valves), intake pipe 6 (including valves), furnace body bottom surface 7, furnace body wall surface 8, paraffin wax tank 9, and coil tray 10. The technical solution of this invention will be described in detail below in terms of three aspects: vacuum control, temperature control, and casting control.

[0102] Vacuum control:

[0103] This invention's paraffin sealing furnace does not require a high degree of vacuum; therefore, a low-power vacuum pump is sufficient. Furthermore, the front door and all pipe connections within the furnace body only need to be sealed to a standard degree. Maintaining a certain level of negative pressure inside the furnace during operation can be achieved through adjustment using a pressure gauge and the air inlet valve.

[0104] Temperature control:

[0105] As mentioned above, the heating system of the paraffin sealing furnace of the present invention is divided into three parts: a main heating system, a paraffin tank auxiliary heating system, and a coil tray auxiliary heating system.

[0106] The main heating system consists of electric heating tubes arranged on the inner wall of the solid-sealed furnace and its associated turbulence fan, such as... Figure 3 As shown. During operation, the turbulence fan rotates at high speed, driving the air to absorb the heat generated by the electric heating tube, and ultimately transferring the heat to the paraffin in the paraffin bath and the coil in the coil tray. The airflow pattern inside the furnace has a significant impact on temperature uniformity; therefore, the fans should be arranged appropriately to achieve sufficient heat exchange between the paraffin and the coil, and to ensure uniform temperature.

[0107] The auxiliary heating system for the paraffin bath consists of electric heating tubes arranged at the bottom of the paraffin container, such as... Figure 4 As shown. During operation, the heat generated by the electric heating element can be transferred to the bottom of the paraffin bath through three methods: conduction, convection, and radiation. It can be used for preheating and rapid melting of solid paraffin, as well as for local heat compensation when the paraffin temperature is slightly low.

[0108] The coil tray auxiliary heating system consists of electric heating tubes arranged at the bottom of the coil tray, such as... Figure 5 As shown. During operation, the heat generated by the electric heating element can be transferred to the bottom surface of the coil tray through three methods: conduction, convection, and radiation. This heat can be used for preheating the coil or for local heat compensation when the coil temperature is slightly low.

[0109] All of the above heating systems have stepless adjustment of heating power to ensure good temperature control.

[0110] Pouring control:

[0111] Lighting and a monitoring system are installed inside the furnace, outputting video signals from the paraffin bath and coil tray to an external display for user observation. Temperature sensors are placed at key locations within the furnace to monitor temperature distribution and help users determine the optimal pouring time. Once pouring conditions are met, the electrically controlled valves on the pouring pipeline are adjusted to initiate the pouring process, which includes a function to regulate the paraffin flow rate. After pouring, the vibrator beneath the coil tray is activated to apply vibration to the coil and accelerate the removal of internal air bubbles.

[0112] Advantages of this invention:

[0113] In terms of overall structure, compared to existing paraffin wax sealing furnaces, this invention combines the wax melting chamber and the sealing chamber into one compact structure. Placing the coil tray below the sealing furnace facilitates the arrangement and removal of heavier coils.

[0114] Regarding vacuum control, compared to existing paraffin sealing furnaces, this invention only requires maintaining a slight negative pressure inside the furnace (e.g., an absolute pressure of 0.9 atmospheres), which greatly reduces the performance requirements of the vacuum pump and the sealing requirements of the furnace body, resulting in lower manufacturing difficulty and cost.

[0115] Regarding temperature control, compared to existing paraffin sealing furnaces, this invention primarily uses air convection for heat transfer. Combined with scientifically arranged electric heating tubes and a turbulence fan, it effectively eliminates the temperature gradient between the coil and the inside of the paraffin, improving the uniformity of its temperature distribution.

[0116] Regarding pouring control, compared to existing paraffin wax sealing furnaces, placing the paraffin wax tank inside the furnace eliminates the need for previously exposed paraffin wax pipelines. This avoids cooling, solidification, blockage, and wax injection at the injection port caused by paraffin wax flow within these pipelines. This results in a smoother and more controllable pouring process, facilitating the gradual and even wetting of the coil by the paraffin wax and the removal of air bubbles, achieving a superior sealing effect. Furthermore, the vibrator positioned below the superconducting coil tray effectively accelerates the removal of air bubbles from within the coil, further enhancing the sealing performance.

[0117] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0118] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the 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

1. A paraffin sealing furnace for vehicle-mounted superconducting magnet coils, characterized in that, include: Furnace body (1), paraffin bath (9), coil tray (10) and heating system; The paraffin bath (9) and the coil tray (10) are disposed inside the furnace body (1); The heating system includes: a main heating system; The main heating system includes: multiple turbulence fans (11) and multiple first electric heating tubes (12) arranged on the inner wall of the furnace body (1); Multiple first electric heating tubes (12) are evenly arranged on the inner wall of the furnace body (1), and the turbulence fan (11) is arranged between the first electric heating tubes (12) and the inner wall of the furnace body (1); The furnace body (1) has a bottom surface (7) and a wall surface (8); the coil tray (10) is disposed on the bottom surface (7) of the furnace body, the paraffin wax tank (9) is disposed above the coil tray (10), the bottom of the paraffin wax tank (9) is provided with a casting pipe (14), and the turbulence fan (11) and the first electric heating tube (12) are disposed on the wall surface (8) of the furnace body. The heating system further includes: an auxiliary heating system for the paraffin bath; the auxiliary heating system for the paraffin bath includes: a second electric heating tube (13) arranged at the bottom of the paraffin bath (9); The heating system further includes: a coil tray auxiliary heating system; the coil tray auxiliary heating system includes: a third electric heating tube (15) arranged at the bottom of the coil tray (10).

2. The paraffin sealing furnace for vehicle-mounted superconducting magnet coils according to claim 1, characterized in that, Also includes: vacuum systems; The vacuum system includes: a vacuum pump (4), an air extraction line (5), and an air inlet line (6); The vacuum pump (4) is connected to the furnace body (1) through the air extraction pipe (5); The air intake pipe (6) is located on the furnace body (1).

3. The paraffin sealing furnace for vehicle-mounted superconducting magnet coils according to claim 1, characterized in that, Also includes: Vibration system; The vibration system includes an exciter (17) arranged below the coil tray (10).

4. The paraffin sealing furnace for vehicle-mounted superconducting magnet coils according to claim 3, characterized in that, The coil tray (10) is mounted on the bottom surface (7) of the furnace body via a coil tray support (16), and the vibrator (17) is mounted on the coil tray support (16).

5. The paraffin sealing furnace for vehicle-mounted superconducting magnet coils according to claim 1, characterized in that, Also includes: The observation window (2) is located on the front door of the furnace body (1).

6. The paraffin sealing furnace for vehicle-mounted superconducting magnet coils according to claim 1, characterized in that, Also includes: Lighting facilities and monitoring systems are installed inside the furnace body (1).

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