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CN112038035B - Close-wound superconducting magnet refrigerating device based on interlayer lamination integral heat conduction - Google Patents

Close-wound superconducting magnet refrigerating device based on interlayer lamination integral heat conduction Download PDF

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CN112038035B
CN112038035B CN202010986910.7A CN202010986910A CN112038035B CN 112038035 B CN112038035 B CN 112038035B CN 202010986910 A CN202010986910 A CN 202010986910A CN 112038035 B CN112038035 B CN 112038035B
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superconducting coil
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CN112038035A (en
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郑金星
郑书悦
朱小亮
陆坤
卫靖
刘海洋
程远
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Hefei Institutes of Physical Science of CAS
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00Superconducting magnets; Superconducting coils
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Abstract

本发明公开了一种基于层间叠片整体热传导的密绕型超导磁体制冷装置,包括有制冷机、蓄冷铜头、层间叠片密绕型超导线圈、外挂间隔插入式外部导冷系统、耐压绝缘型导热传输系统;其所述制冷机通过外接波纹管连接到蓄冷铜头,通过耐压绝缘型导热传输系统将所述蓄冷铜头连接到外挂间隔插入式外部导冷系统;并所述外挂间隔插入式外部导冷系统与层间叠片密绕型超导线圈外部触点直接连接,所述外挂间隔插入式外部导冷系统通过耐压绝缘型导热传输系统与蓄冷铜头连接;所述层间叠片密绕型超导线圈触点与外挂间隔插入式外部导冷系统连接;通过紧固组件将层间叠片密绕型超导线圈、外挂间隔插入式外部导冷系统、耐压绝缘型导热传输系统和蓄冷铜头连接成一个整体。

Figure 202010986910

The invention discloses a densely wound superconducting magnet refrigeration device based on the overall heat conduction of interlayer laminations. system, pressure-resistant insulation type heat conduction transmission system; wherein the refrigerator is connected to the cold storage copper head through an external corrugated pipe, and the cold storage copper head is connected to the externally mounted interval plug-in type external cold conduction system through the pressure-resistant insulation type heat conduction transmission system; And the externally mounted spaced plug-in external cooling system is directly connected to the external contacts of the interlayer densely wound superconducting coil, and the externally mounted spaced plug-in external cooling system is connected to the cold storage copper head through a pressure-resistant insulating heat transfer system. connection; the interlayer laminated densely wound superconducting coil contact is connected with the external spaced plug-in external cooling system; the interlayer laminated densely wound superconducting coil and the external spaced plugged external cooling system are connected through the fastening components The system, the pressure-resistant insulating heat conduction transmission system and the cold storage copper head are connected into a whole.

Figure 202010986910

Description

Close-wound superconducting magnet refrigerating device based on interlayer lamination integral heat conduction
Technical Field
The invention relates to the field of low-temperature superconducting conduction refrigeration, in particular to a close-wound superconducting magnet efficient refrigeration structure based on interlayer lamination integral heat conduction.
Background
The superconducting proton treatment system is a novel international large-scale medical system for curing tumors, wherein a superconducting magnet is a key technology for realizing the superconducting miniaturization of a proton treatment device. The superconducting magnet has the function of being used for beam energy led out by the rotary frame, reducing the occupied space for placing, reducing the tonnage of the system and saving the cost. The overall appearance of the superconducting magnet is tight, and the current density and the magnetic field uniformity far exceed the functional requirements of a conventional magnet, so that the performance of the component indirectly determines the precision of beam current at a treatment end, and the later maintenance cost is reduced. The system has simple structure, reliable performance, stable operation and safety.
The superconducting coil has the minimum resistance in a superconducting state, zero current loss can be realized, high current carrying density under low current can be realized, the superconducting coil can be made into a superconducting magnet with small volume and high magnetic field uniformity, and the superconducting magnet is an internationally recognized technical development direction, wherein the cooling of the superconducting magnet coil is an important part for realizing the superconduction of the superconducting magnet.
The traditional superconducting magnet is generally refrigerated by adopting a low-temperature superconducting wire NbTi and other liquid helium soaking modes. However, the low-temperature superconducting magnet has high cost, and the low-temperature superconducting magnet has high refrigeration and maintenance cost because the low-temperature superconducting magnet must work in a liquid helium temperature zone (4.2K), and meanwhile, because the selection of the operation temperature is limited by the boiling point of helium, under any accidental quench condition of the magnet, a large amount of low-density steam can be generated, so that the pressure inside the coil box is increased sharply, and the potential safety hazard of pressure is generated.
The invention content is as follows:
the invention aims to develop the prior art, and provides a close-wound superconducting magnet refrigerating device based on interlayer lamination integral heat conduction, which adopts a single-layer conduction cooling mode inside a superconducting coil to realize low-temperature electrified operation of a superconducting magnet integral system, does not need to add liquid helium for cooling in the operation process, adopts a conduction cooling technology to realize rapid cooling, low-cost rotation, rapid variable excitation and long-period stable operation of the superconducting coil under the conditions of low-temperature stabilization and high-vacuum non-pressure gathering safety, and can ensure the internal pressure safety and quench safety of the superconducting magnet in the rotation process.
The invention is realized by the following technical scheme: a close-wound superconducting magnet refrigerating device based on interlayer lamination integral heat conduction comprises a refrigerator, a cold accumulation copper head, an interlayer lamination close-wound superconducting coil, an externally-hung interval plug-in external cold conduction system and a voltage-resistant insulation heat conduction transmission system;
the refrigerator is connected to a cold accumulation copper head through an external corrugated pipe, and the cold accumulation copper head is connected to an external plug-in type external cold guide system through a voltage-resistant insulation type heat conduction transmission system;
the externally-hung interval plug-in type external cold conduction system is directly connected with an external contact of the interlayer lamination close-wound type superconducting coil, and is connected with the cold accumulation copper head through a voltage-resistant insulation type heat conduction transmission system;
the interlayer lamination close-wound superconducting coil contact is connected with an externally-hung interval plug-in external cold conduction system;
the interlayer lamination close-wound superconducting coil, the externally-hung interval insertion type external cold conduction system, the voltage-resistant insulation type heat conduction transmission system and the cold accumulation copper head are connected into a whole through the fastening assembly.
Furthermore, a full-contact internal cold-conducting copper strip is arranged inside the conducting wire layer of the superconducting coil and is tightly matched with the superconducting coil to finish VPI solidification.
Furthermore, full-contact internal cold-conducting copper strips are arranged inside the close-wound superconducting coil in an interlayer lamination mode, the full-contact internal cold-conducting copper strips are separated from each layer of superconducting coil according to a voltage-resistant insulation grade larger than 1G omega, and the full-contact internal cold-conducting copper strips extend to the outside of the close-wound superconducting coil according to intermittent contact; the cold accumulation structure is arranged outside the superconducting coil and is connected with the outside of the full-contact internal cold conduction copper strip to complete assembly.
Furthermore, the voltage-resistant insulating heat conduction transmission system adopts a C-shaped plate structure, and one end of the voltage-resistant insulating heat conduction transmission system is connected with the upper end and the lower end of the externally-hung interval plug-in external cold conduction system to transmit cold energy into the superconducting coil; the other end of the C-shaped plate structure is clamped at two ends of the cold accumulation copper head plate in a matched mode with the Z-shaped plate, cold quantity supply is provided when the superconducting coil normally works, the cold accumulation effect is achieved, low-temperature superconducting temperature of 1K temperature difference is provided for the superconducting coil when the superconducting coil normally works, quick cooling capacity is provided when the superconducting coil loses time, and the C-shaped plate and the Z-shaped plate are insulated and separated from the contact surface of the cold accumulation copper head by adopting aluminum nitride.
Furthermore, the superconducting coil comprises a conductor layer, a full-contact internal cold-conducting copper strip and a VPI curing layer; the superconducting coil wire layer is separated by a single-layer insulating cladding of the full-contact internal cold-conducting copper strip, the superconducting coil wire layer is attached to the surface of the full-contact internal cold-conducting copper strip, and the insulating cladding is positioned in the VPI curing layer;
and one end of the single-layer full-contact inner cold conducting copper belt outside the close-wound superconducting coil adopts a spaced single-chip structure and is positioned outside the VPI curing layer to be used as a contact and an external cold conducting system.
Furthermore, the refrigerator is connected with the Dewar through an outer flange, the primary cold head is connected with the radiation cold screen through a soft copper strip, and the secondary cold head is connected with the cold accumulation copper head.
Further, the coil box wraps up in superconducting coil outside, plays fixed and sealed effect to the coil, and the cold screen is located coil box outside and reduces the influence of external radiant heat to coil box, and the dewar is located the cold screen outside, provides vacuum environment for inner structure.
Has the advantages that:
the invention relates to a high-efficiency refrigerating structure of a densely wound superconducting magnet with interlayer lamination integral heat conduction, which can realize a direct cooling system of a superconducting magnet coil. The invention provides a direct cooling system of a superconducting magnet coil, which provides a novel structure for a superconducting dipolar iron coil cooling mode. The invention has important significance for further development of the superconducting magnet.
Drawings
FIG. 1 is a schematic structural diagram of a close-wound superconducting magnet efficient refrigerating device based on interlayer lamination overall heat conduction according to the invention;
FIG. 2 is a schematic view of a laminated close-wound superconducting coil structure according to the present invention;
fig. 3 illustrates a voltage-resistant, insulated, thermally conductive transmission system of the present invention.
The reference numbers illustrate: 1. a refrigerator; 2. cold accumulation copper head; 3. a C-shaped connecting plate; 4. a Z-shaped connecting plate; 5. externally hanging an interval plug-in type external cold guide system; 6. a close-wound superconducting coil; 7. a full-contact interlayer cold-conducting copper strip; 8. a conductor layer; 9. a VPI curing layer; 10. a coil box; 11. cooling the screen; 12. a dewar.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
Referring to the attached drawings 1-3, according to an embodiment of the present invention, a close-wound superconducting magnet efficient refrigeration device based on interlayer lamination overall heat conduction is provided, which includes a refrigerator 1, a cold accumulation copper head 2, an interlayer lamination close-wound superconducting coil 6, an external plug-in interval external cold conduction system 5, and a voltage-resistant insulation type heat conduction transmission system. The refrigerator 1 provides cold energy with the temperature of 4.2K for the close-wound superconducting coil 6 through the cold accumulation copper head 2, the C-shaped connecting plate 3 and the Z-shaped connecting plate 4 connect the externally hung interval insertion type external cold guide system 5 and the cold accumulation copper head 2 together to transmit the cold energy to the inside of the close-wound superconducting coil 6, the close-wound superconducting coil 6 cools the close-wound superconducting coil 6 to the temperature zone of 4.2K through the full-contact interlayer cold guide copper strip, and meanwhile, the temperature difference of a magnet is ensured to be less than 1K;
the close-wound superconducting coil comprises a lead layer 8, a full-contact interlayer cold-conducting copper strip 7 and a VPI curing layer 9; the close-wound superconducting coil wire layers 8 are insulated and separated by full-contact interlayer cold-conducting copper strips 7; the wire layer 8 and the insulation cladding of the close-wound superconducting coil are both positioned in the VPI curing layer 9; the full-contact interlayer cold-conducting copper strip 7 is partially positioned outside the VPI curing layer 9, and the other part of the full-contact interlayer cold-conducting copper strip is positioned inside the VPI curing layer 9;
coil box 10 parcel is outside superconducting coil, plays fixed and sealed effect to the coil, and cold screen 11 is located coil box 10 outside and reduces the influence of external radiant heat to the coil box, and dewar 12 is located cold screen 11 outsidely, provides vacuum environment for inner structure.
The refrigerator 1 is directly connected with the inside of the superconducting coil through a single-layer full-contact internal-conduction cold copper strip in an extending manner by a cold accumulation copper head 2 and an externally-hung interval plug-in type external cold conduction system 5, the refrigerator 1 is connected with a Dewar 12 through an external flange, a primary cold head is connected with a radiation cold screen through a soft copper strip, and a secondary cold head is connected with the cold accumulation copper head 2;
the pressure-resistant insulating heat conduction transmission system adopts a cold accumulation copper head form, the cold quantity is concentrated, a C-shaped plate and a Z-shaped plate structure are adopted to directly connect the refrigerating machine and the superconducting coil in series, and the contact surfaces of the C-shaped plate and the Z-shaped plate and the cold accumulation copper head are insulated and separated by adopting aluminum nitride to form a high-efficiency refrigerating structure.
The interlayer lamination close-wound superconducting coil is characterized in that the superconducting coil and a full-contact interlayer cold conduction copper strip are solidified together through VPI, and the superconducting coil and the full-contact interlayer cold conduction copper strip are integrally connected into a close-wound conduction cooling integral structure in an interlayer insulation mode.
According to one embodiment of the invention, full-contact internal cold-conducting copper strips are arranged inside the close-wound superconducting coil in an interlayer lamination mode, the full-contact internal cold-conducting copper strips are separated from each layer of superconducting coil according to a voltage-resistant insulation grade larger than 1G omega, and the full-contact internal cold-conducting copper strips extend to the outside of the close-wound superconducting coil according to intermittent contact; the cold accumulation structure is arranged outside the superconducting coil and is connected with the outside of the full-contact internal cold conduction copper strip to complete assembly.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.

Claims (6)

1. A close-wound superconducting magnet refrigerating device based on interlayer lamination integral heat conduction is characterized in that: comprises a refrigerator, a cold accumulation copper head, an interlayer lamination close-wound superconducting coil, an externally hung interval insertion type external cold conduction system and a voltage-resistant insulation type heat conduction transmission system;
the refrigerator is connected to a cold accumulation copper head through an external corrugated pipe, and the cold accumulation copper head is connected to an external plug-in type external cold guide system through a voltage-resistant insulation type heat conduction transmission system;
the externally-hung interval plug-in type external cold conduction system is directly connected with an external contact of the interlayer lamination close-wound type superconducting coil, and is connected with the cold accumulation copper head through a voltage-resistant insulation type heat conduction transmission system;
the interlayer lamination close-wound superconducting coil, the externally-hung interval insertion type external cold conduction system, the voltage-resistant insulation type heat conduction transmission system and the cold accumulation copper head are connected into a whole through a fastening assembly;
the pressure-resistant insulating heat conduction transmission system adopts a C-shaped plate structure, and one end of the pressure-resistant insulating heat conduction transmission system is connected with the upper end and the lower end of the externally hung interval insertion type external cold conduction system to transmit cold energy to the inside of the superconducting coil; the other end of the C-shaped plate structure is clamped at two ends of the cold accumulation copper head plate in a matched mode with the Z-shaped plate, cold quantity supply is provided when the superconducting coil normally works, the cold accumulation effect is achieved, low-temperature superconducting temperature of 1K temperature difference is provided for the superconducting coil when the superconducting coil normally works, quick cooling capacity is provided when the superconducting coil loses time, and the C-shaped plate and the Z-shaped plate are insulated and separated from the contact surface of the cold accumulation copper head by adopting aluminum nitride.
2. The apparatus of claim 1 for cooling a close-wound superconducting magnet based on overall heat conduction through an interlayer stack, wherein:
a full-contact internal cold-conducting copper belt is arranged inside the conducting wire layer of the superconducting coil and is tightly matched with the superconducting coil to finish VPI solidification.
3. The apparatus of claim 1 for cooling a close-wound superconducting magnet based on overall heat conduction through an interlayer stack, wherein:
the fully-contacted internal cold-conducting copper strip is arranged in the close-wound superconducting coil in an interlayer lamination mode, the fully-contacted internal cold-conducting copper strip is separated from each layer of superconducting coil according to a voltage-resistant insulation grade larger than 1G omega, and the fully-contacted internal cold-conducting copper strip extends to the outside of the close-wound superconducting coil according to intermittent contact; the cold accumulation structure is arranged outside the superconducting coil and is connected with the outside of the full-contact internal cold conduction copper strip to complete assembly.
4. A tightly wound superconducting magnet refrigerator according to claim 3, wherein:
the superconducting coil comprises a lead layer, a full-contact internal cold-conducting copper strip and a VPI curing layer; the superconducting coil wire layer is separated by a single-layer insulating cladding of the full-contact internal cold-conducting copper strip, the superconducting coil wire layer is attached to the surface of the full-contact internal cold-conducting copper strip, and the insulating cladding is positioned in the VPI curing layer; and one end of the full-contact internal conduction cooling copper belt outside the close-wound superconducting coil adopts a spaced single-chip structure and is positioned outside the VPI solidified layer to be used as a contact and an external conduction cooling system.
5. The apparatus of claim 1 for cooling a close-wound superconducting magnet based on overall heat conduction through an interlayer stack, wherein:
the refrigerator is connected with the Dewar through an outer flange, the primary cold head is connected with the radiation cold shield through a soft copper strip, and the secondary cold head is connected with the cold accumulation copper head.
6. The apparatus of claim 1 for cooling a close-wound superconducting magnet based on overall heat conduction through an interlayer stack, wherein:
the coil box wraps up in superconducting coil outside, plays fixed and sealed effect to the coil, and the cold screen is located coil box outside and reduces the influence of external radiation heat to coil box, and the dewar is located the cold screen outside, provides vacuum environment for inner structure.
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