A high-temperature superconducting magnet device integrated terminal and working method

Abstract

The invention discloses an integrated terminal of a high-temperature superconducting magnet device, comprising a dewar, a cooling component, a vacuum component, a large current lead component, and a signal / small current wiring component; the dewar comprises a docking flange, and ports are reserved for each component; the cooling component comprises a primary cold head, a secondary cold head, a liquid nitrogen cooling terminal and a cold conduction plate; the vacuum component comprises a vacuum gauge and an angle valve; the large current lead component comprises a vacuum electrode connector, an electrode primary cooling component and an electrode secondary cooling component; the signal / small current wiring component comprises a multi-core electrical connector, a signal line and a wiring circuit board; and a working method thereof is also disclosed; the invention can be used as an accessory of a high-temperature superconducting magnet device such as a high-temperature superconducting energy storage, a superconducting motor (armature rotation) and an induction heating device, is reusable, and is convenient for maintenance, and provides an efficient cooling solution for the magnet.

Description

Technical Field

[0001] The present invention belongs to the field of high-temperature superconducting magnet technology, and in particular relates to a high-temperature superconducting magnet device integrated terminal and a working method thereof. Background Art

[0002] High-temperature superconducting magnets are electromagnets wound with superconducting tapes with high transition temperature and high irreversible magnetic field. High-temperature superconducting magnets are core components of superconducting power devices such as superconducting motors, superconducting magnetic energy storage and induction heating. Due to different requirements, the topological structures of these superconducting devices vary greatly, and the shapes and dimensions of the magnet dewars also vary greatly.

[0003] But these superconducting devices share some common equipment: vacuum components that keep the magnets below 10 -2 Pa vacuum environment to reduce conduction heat leakage; cooling components are used to reduce the temperature of the magnet to 10~77K; large current lead components provide large current input for the magnet, and the design needs to consider reducing heat leakage; signal / small current wiring components pass the magnet voltage, temperature and other signal lines through the vacuum and introduce them into the data acquisition instrument.

[0004] At present, these components are usually integrated on the magnet dewar. The advantage is high space utilization, but the disadvantage is that for prototypes or experimental test equipment, there is a lot of repetitive design and processing work, which also causes a large waste of resources. When the magnet device is not working, these devices can be moved to other devices for use.

[0005] For high-temperature superconducting magnet devices with large cooling weight, in order to improve the cooling efficiency, the method usually adopted is to increase the number of refrigerators. This method will greatly increase the cost of the device. There is an urgent need for a simple and efficient method to quickly cool the magnets. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide an integrated terminal for a high temperature superconducting magnet device.

[0007] The technical solution adopted by the present invention to solve its technical problems is: an integrated terminal of a high-temperature superconducting magnet device, including a magnet dewar and a cooling component, a vacuum component, a large current lead component and a signal / small current wiring component arranged on the dewar; the side wall of the dewar is provided with a docking flange for docking with the dewar of the high-temperature superconducting magnet; the cooling component includes a plurality of groups of primary cold heads, a plurality of groups of secondary cold heads and liquid nitrogen cooling terminals arranged outside the dewar, and also includes a primary cold conduction plate arranged in the inner cavity of the dewar and connected to the primary cold head, used for cooling the primary current lead and the radiation-proof cold shield, and a secondary cold conduction plate arranged in the inner cavity of the dewar and connected to the secondary cold head and the liquid nitrogen cooling terminal, used for Cooling secondary current leads and magnets; the liquid nitrogen cooling terminal includes a closed cavity formed by a glass corrugated tube, a copper cold conduction plate and an upper sealing plate for accommodating liquid nitrogen, and an epoxy support rod sealed with a rubber O-ring that can drive the glass corrugated tube to stretch or compress, and a liquid nitrogen outlet and a liquid nitrogen inlet arranged on the glass corrugated tube; the vacuum assembly includes a vacuum gauge and an angle valve installed outside the Dewar; the high current lead assembly includes a vacuum electrode connector arranged outside the Dewar, an electrode primary cooling assembly, and an electrode secondary cooling assembly; the signal / small current wiring assembly includes a multi-core electrical connector, a signal line, a vacuum electrode connector and a signal line wiring circuit board arranged outside the Dewar.

[0008] The high-temperature superconducting magnet device integrated terminal has a primary cold head which is a 70K single-stage refrigerator, and a secondary cold head which is a 10K single-stage refrigerator.

[0009] The second object of the present invention is to provide a high temperature superconducting magnet device integrated terminal working method, based on the above-mentioned high temperature superconducting magnet device, the specific steps are:

[0010] Step 1, connecting with the superconducting magnet: use a soft copper busbar to connect the secondary cold plate with the superconducting magnet cold plate, and use a soft copper busbar to connect the primary cold plate with the radiation-proof cold screen; connect the superconducting magnet current lead with the secondary cooled high current lead; weld the voltage, temperature strain and other signal lines inside the superconducting magnet and the heating resistor lead for temperature control on the signal line wiring circuit board;

[0011] Step 2, connect with instruments: connect the vacuum electrode connector with the superconducting magnet DC power supply with a cable; connect the multi-core electrical connector with the multi-channel data acquisition module, temperature controller and other instruments; connect the angle valve and vacuum pump unit, and connect the vacuum gauge with the vacuum gauge;

[0012] Step 3: Vacuuming: Use a vacuum pump unit to evacuate the Dewar to a vacuum degree of less than 10 -2 Below Pa;

[0013] Step 4, cooling the magnet: Turn on the primary refrigerator and the secondary refrigerator to cool the superconducting magnet: If the cold weight of the magnet is large, use liquid nitrogen cooling terminals for auxiliary cooling, slide the epoxy support rod to make the copper cold plate and the secondary cold plate in close contact, inject liquid nitrogen through the liquid nitrogen inlet, and when the magnet temperature approaches 77K, slide the epoxy support rod to separate the copper cold plate from the secondary cold plate; continue to cool the magnet through the secondary cold head.

[0014] Step 5, magnet excitation: When the temperature of the superconducting magnet is stable, the superconducting magnet is excited by a superconducting magnet DC power supply, and signals such as the magnet voltage and temperature are collected.

[0015] In the high-temperature superconducting magnet device integrated terminal, the operating temperature of the superconducting magnet is controlled by a temperature controller during the magnet cooling process in step 4.

[0016] The beneficial effects of the present invention are as follows: the patented high-temperature superconducting magnet device integrated terminal integrates the equipment shared by superconducting motors, superconducting magnetic energy storage, induction heating and other devices into one dewar, and designs a friendly interface for easy disassembly and assembly, thereby improving the design efficiency of the high-temperature superconducting magnet device, improving resource utilization, and providing a solution for the rapid cooling of large cold heavy magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the liquid nitrogen cooling terminal of the present invention.

[0019] The figures are marked as follows: 1—Dewar, 2—primary cold conduction plate, 3—multi-core electrical connector, 4—vacuum electrode connector, 5—primary cold head, 6—vacuum gauge, 7—secondary cold head, 8—angle valve, 9—liquid nitrogen cooling terminal, 10—secondary cold conduction plate support rod, 11—secondary cold conduction plate, 12—docking flange, 13—signal line wiring circuit board, 14—copper cold conduction plate, 15—glass corrugated tube, 16—epoxy support rod, 17—liquid nitrogen outlet, 18—upper sealing plate, 19—liquid nitrogen inlet. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Reference Figure 1 As shown, a high-temperature superconducting magnet device integrated terminal disclosed in the present invention includes a magnet dewar 1 and a cooling component, a vacuum component, a large current lead component and a signal / small current wiring component arranged on the dewar 1.

[0022] The side wall of the Dewar 1 is provided with a docking flange 12, which is docked with the Dewar 1 of the high-temperature superconducting magnet. The large current interface, cooling circuit interface, voltage, temperature strain and other signal interfaces required for the operation of the superconducting magnet are all arranged inside the docking flange 12, and are connected by bolts or soldering, which is convenient for disassembly and assembly.

[0023] The cooling assembly includes several groups of primary cold heads 5, several groups of secondary cold heads 7 and liquid nitrogen cooling terminals 9 arranged outside the Dewar 1, and also includes a primary cold conduction plate 2 arranged in the inner cavity of the Dewar 1 and connected to the primary cold head 5, which is used to cool the primary current lead and the radiation-proof cold shield. The primary cold head 5 is preferably a 70K single-stage refrigerator, and a secondary cold conduction plate 11 arranged in the inner cavity of the Dewar 1 and connected to the secondary cold head 7 and the liquid nitrogen cooling terminal 9, which is used to cool the secondary current lead and the magnet, wherein the secondary cold conduction plate 11 is suspended in the Dewar 1 through a secondary cold conduction plate support rod 10, and the secondary cold head 7 is preferably a 10K single-stage refrigerator; the low-temperature end is coated with multiple layers of insulation material to reduce radiation heat leakage.

[0024] Reference Figure 2 As shown, the liquid nitrogen cooling terminal 9 includes a closed cavity for accommodating liquid nitrogen formed by a glass tube 15, a copper cold conduction plate 14 and an upper sealing plate 18, an epoxy support rod 16 that is sealed by a rubber O-ring and moves in a vertical direction to stretch or compress the glass tube 15, and a liquid nitrogen outlet 17 and a liquid nitrogen inlet 19 arranged on the glass tube 15.

[0025] The vacuum assembly comprises a vacuum gauge 6 and an angle valve 8 installed outside the Dewar 1; the vacuum gauge and the vacuum pump unit are connected to maintain the system vacuum.

[0026] The large current lead assembly comprises a vacuum electrode connector 4 arranged outside the dewar 1, an electrode primary cooling assembly, and an electrode secondary cooling assembly; several pairs of current leads can be configured to excite multiple sets of coils.

[0027] The signal / small current wiring assembly comprises a multi-core electrical connector 3 arranged outside the dewar 1, a signal line, a vacuum electrode connector 4 and a signal line wiring circuit board 13.

[0028] The working method of the high-temperature superconducting magnet device integrated terminal of the present invention comprises the following steps:

[0029] Step 1, connecting with the magnet device: use soft copper busbars to connect the secondary cooling plate 11 and the superconducting magnet cooling plate, and use soft copper busbars to connect the primary cooling plate 2 and the radiation-proof cold shield; connect the magnet current lead with the high current lead that has been cooled by the secondary cooling; weld the signal lines such as voltage, temperature strain, etc. inside the magnet, and the heating resistor leads used for temperature control to the signal line wiring circuit board 13.

[0030] Step 2, connect with instruments: use cables to connect the vacuum electrode connector 4 and the superconducting magnet DC power supply; connect the multi-core electrical connector 3 with multi-channel data acquisition modules, temperature controllers and other instruments; connect the angle valve 8 and the vacuum pump unit, and connect the vacuum gauge 6 and the vacuum gauge.

[0031] Step 3, vacuuming: Use a vacuum pump unit to evacuate Dewar 1 to a vacuum degree of less than 10 -2 Below Pa.

[0032] Step 4, cooling the magnet: Turn on the primary refrigerator and the secondary refrigerator to cool the superconducting magnet: If the magnet is heavy, use liquid nitrogen cooling terminal 9 for auxiliary cooling, slide the epoxy support rod 16 to make the copper cold plate 14 and the secondary cold plate 11 in close contact, inject liquid nitrogen through the liquid nitrogen inlet 19, and when the magnet temperature reaches the set value close to 77K, slide the epoxy support rod 16 to separate the copper cold plate 14 from the secondary cold plate 11, and continue to cool the magnet through the secondary cold head 7. During the magnet cooling process, the working temperature of the superconducting magnet is controlled by the temperature controller.

[0033] Step 5, magnet excitation: When the temperature of the superconducting magnet is stable, the superconducting magnet is excited by a superconducting magnet DC power supply, and signals such as the magnet voltage and temperature are collected.

[0034] The above description is only a preferred embodiment of the present invention and does not illustrate the limitation of the present invention. All superconducting wind turbines with similar structures should be considered as within the protection scope of the present invention.

Claims

1. A working method of a high-temperature superconducting magnet device integrated terminal, characterized in that: Based on an integrated terminal including a dewar (1) and a cooling component, a vacuum component, a high current lead component and a signal / low current wiring component arranged on the dewar (1), the side wall of the dewar (1) is provided with a docking flange (12), the cooling component includes a primary cold head (5), a secondary cold head (7) and a liquid nitrogen cooling terminal (9) arranged outside the dewar (1), and also includes a primary cold conduction plate (2) arranged in the inner cavity of the dewar (1) and connected to the primary cold head (5), and a secondary cold conduction plate (11) arranged in the inner cavity of the dewar (1) and connected to the secondary cold head (7) and the liquid nitrogen cooling terminal (9), the liquid nitrogen cooling terminal (9) includes a glass corrugated tube (15), a copper cold conduction plate (14) and an upper sealing plate ( 18) formed a closed cavity and an epoxy support rod (16) for driving the glass tube (15) to move, the glass tube (15) is respectively provided with a liquid nitrogen outlet (17) and a liquid nitrogen inlet (19), the vacuum assembly comprises a vacuum gauge (6) and an angle valve (8) installed outside the dewar (1), the large current lead assembly comprises a vacuum electrode connector (4) arranged outside the dewar (1), the signal / small current wiring assembly comprises a multi-core electrical connector (3) arranged outside the dewar (1), a vacuum electrode connector (4) and a signal line wiring circuit board (13), the primary cold head (5) is a 70K single-stage refrigerator, and the secondary cold head (7) is a 10K single-stage refrigerator; the steps are: Step 1, connecting the secondary cooling plate (11) and the superconducting magnet cooling plate with a soft copper busbar, and connecting the primary cooling plate (2) and the radiation protection cold shield with a soft copper busbar; connecting the secondary cooled high current lead with the current lead of the superconducting magnet; and welding the signal line and the heating resistor lead of the superconducting magnet to the signal line wiring circuit board (13); Step 2, connect the vacuum electrode connector (4) to the superconducting magnet DC power supply with a cable; connect the multi-core electrical connector (3) to the multi-channel data acquisition module and the temperature controller; connect the angle valve (8) and the vacuum pump unit, and connect the vacuum gauge (6) to the vacuum gauge; Step 3: Use a vacuum pump unit to evacuate the Dewar (1) to a vacuum degree of less than 10 -2 Below Pa; Step 4, turn on the primary refrigerator and the secondary refrigerator to cool the superconducting magnet: if the cold weight of the magnet is large, use liquid nitrogen cooling terminal (9) to assist cooling, slide the epoxy support rod (16) to make the copper cold plate (14) and the secondary cold plate (11) in close contact, inject liquid nitrogen through the liquid nitrogen inlet (19), when the temperature of the magnet is close to 77K, slide the epoxy support rod (16) to separate the copper cold plate (14) and the secondary cold plate (11), and continue to cool the magnet through the secondary cold head (7); Step 5: After the temperature of the superconducting magnet is stabilized, the superconducting magnet is excited by a superconducting magnet DC power supply, and the magnet voltage and temperature signals are collected.

2. A high temperature superconducting magnet device integrated terminal working method according to claim 1, characterized in that: In the step 4, the operating temperature of the superconducting magnet is controlled by a temperature controller during the magnet cooling process.

Images