CN-224232427-U - Kiloampere-level large current-carrying air-cooling current lead

CN224232427UCN 224232427 UCN224232427 UCN 224232427UCN-224232427-U

Abstract

The application discloses a kiloampere-level large current carrying air cooling current lead, which comprises a room temperature current carrying part, a fin cooling part, a superconductive part and a lead connecting part which are sequentially connected along the length direction of the current lead. The room temperature current-carrying part is electrically connected with the room temperature power supply, and the lead connecting part is electrically connected with the superconducting magnet and is immersed in the liquid helium cavity. The current lead is internally provided with an air cooling flow passage extending along the extending direction of the lead, one end of the air cooling flow passage extends into the liquid helium cavity, and the other end of the air cooling flow passage sequentially penetrates through the high-temperature superconducting part, the fin cooling part and the room-temperature current carrying part and is communicated with the outside. The fin cooling part comprises a fin outer cylinder body and a fin assembly positioned in the fin outer cylinder body, wherein the fin assembly comprises a plurality of fins which are arranged at intervals and extend parallel to the extending direction of the lead wires. And an air cooling flow passage is arranged in the current lead, so that when helium in the liquid helium cavity flows through each component through the air cooling flow passage, the current lead is cooled, and the heat dissipation efficiency of the current lead is improved.

Inventors

HAO XIANGLIN
XIE YI
TANG GUOJUN
ZHANG YUKAI
LIU FEI

Assignees

岩超聚能(上海)科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. A kiloampere-level large-current-carrying air-cooled current lead is characterized by comprising a room temperature current carrying part, a fin cooling part, a superconductive part and a lead connecting part which are sequentially connected along the length direction of the current lead, wherein The room temperature current carrying part is electrically connected with a room temperature power supply, the lead connecting part is electrically connected with a superconducting magnet and is immersed in a liquid helium cavity, current from the room temperature current carrying part sequentially passes through the room temperature current carrying part, the fin cooling part, the high temperature superconducting part and the lead connecting part to enter the superconducting magnet, and An air cooling flow passage extending along the extending direction of the current lead is arranged in the current lead, one end of the air cooling flow passage extends into the liquid helium cavity, and the other end sequentially penetrates through the high-temperature superconductive part, the fin cooling part and the room-temperature current carrying part and is communicated with the outside, wherein The fin cooling part comprises a fin outer cylinder body and a fin assembly positioned in the fin outer cylinder body, wherein the fin assembly comprises a plurality of fins which are arranged at intervals and extend parallel to the extending direction of the lead, and gaps among the fins and gaps between the fins and the fin outer cylinder body form a cooling channel along the same extending direction of the lead.
2. The high-current-carrying air-cooled current lead of claim 1, wherein the room-temperature current-carrying portion comprises a room-temperature current-carrying portion and a seal-connecting portion sequentially connected in the direction in which the lead extends, wherein the room-temperature current-carrying portion is further away from the fin cooling portion than the seal-connecting portion, the room-temperature power supply is electrically connected to the room-temperature current-carrying portion, one end of the seal-connecting portion is hermetically connected to one end of the room-temperature current-carrying portion, and the other end is hermetically connected to the corresponding end of the fin cooling portion, wherein A first cooling channel forming part of the air cooling flow channel is arranged in the room temperature current carrying component, an exhaust pipe is also arranged at the other end of the room temperature current carrying component far away from the sealing connection component and communicated with the first cooling channel, and The inside of the sealing connection part is also provided with a second cooling channel which forms a part of the air cooling flow channel, and the first cooling channel is communicated with the second cooling channel.
3. The kiloampere-scale large-current-carrying air-cooling current lead according to claim 2, wherein the sealing connection part comprises a connection pipe and a room-temperature sealing assembly positioned outside the connection pipe, the connection pipe extends along the extending direction of the lead, two ends of the connection pipe are respectively in sealing connection with the room-temperature current-carrying part and the fin outer cylinder body, the second cooling channel is formed in the connection pipe, and the room-temperature sealing assembly comprises a sealing member sleeved on the outer wall part of the connection pipe and two groups of pressing members which are arranged on two sides of the sealing member in an abutting mode along the axial direction of the connection pipe.
4. The high-load air-cooled current lead according to claim 3, wherein the sealing member comprises an elastic seal ring, a pair of insulating sleeves, and a connecting flange, the inner ring of the elastic seal ring is in sealing contact with the outer wall of the connecting pipe, the pair of insulating sleeves are respectively clamped and contacted with the axial two side end parts of the elastic seal ring, the connecting flange is in contact with the outer periphery of the elastic seal ring and the outer periphery of the part of the pair of insulating sleeves close to the elastic seal ring, wherein Each compression member comprises a compression nut and a compression gasket, each compression gasket is abutted with the insulation sleeve on the corresponding side, and each compression nut is respectively in threaded connection with the corresponding outer wall part of the connecting pipe and is abutted with the corresponding compression gasket.
5. A kiloamp-level large current carrying air cooled current lead as claimed in any one of claims 1 to 4 wherein The fin outer cylinder is arranged in a cylinder shape extending along the extending direction of the lead, and gaps among a plurality of fins and gaps between the fins and the fin outer cylinder form a third cooling channel of the air cooling flow channel at the fin cooling part; The high-temperature superconducting part comprises a cylindrical superconducting cylinder body extending along the extending direction of the lead, a fourth cooling channel forming a part of the air cooling flow channel is arranged in the superconducting cylinder body, and a hollow cooling joint is further arranged at the end part of the fin outer cylinder body, which is connected with the high-temperature superconducting part; wherein the method comprises the steps of And one end of the cooling joint is in sealing welding with the fin outer cylinder body, the other end of the cooling joint is in sealing welding with the superconducting cylinder body, and the third cooling channel and the fourth cooling channel are communicated through the cooling joint.
6. A kiloampere-scale large current carrying air-cooled current lead according to claim 5, wherein the outer wall portion of the superconducting cylinder is circumferentially provided with a plurality of high temperature superconducting tapes at intervals, each of the high temperature superconducting tapes extending in an axial direction of the superconducting cylinder.
7. The kiloamp-level large current carrying air-cooled current lead according to claim 6, wherein the outer wall portion of the superconducting cylinder is provided with a plurality of mounting grooves at intervals in a circumferential direction, and each of the high temperature superconducting tapes is welded and fixed in the corresponding mounting groove.
8. The kiloamp-level large current carrying air-cooled electrical current lead of claim 7, wherein the high temperature superconductive tapes are not welded in at least two of the mounting slots, and wherein a plurality of air-permeable slots are formed in each of the mounting slots in which the high temperature superconductive tapes are not welded at intervals in a bottom wall, each of the air-permeable slots extending through a side wall of the superconductive cylinder.
9. The high current carrying air-cooled electrical current lead of claim 5, wherein said lead connection is welded to an end of said superconductive cylinder remote from said fin outer cylinder, wherein The lead connection portion includes a lead conductor extending in the lead extending direction, a slot is provided on the lead conductor, the lead conductor is electrically connected with the superconducting magnet, and the slot communicates with the fourth cooling passage.
10. The kiloamp-level atmospheric cooling current lead according to any one of claims 1-4 wherein the room temperature current carrying portion, the fin cooling portion, the high temperature superconductor portion, and the lead connection are all electrically conductive.

Description

Kiloampere-level large current-carrying air-cooling current lead Technical Field The utility model relates to the technical field related to superconducting magnet equipment, in particular to a kiloampere-level large current-carrying air-cooling current lead. Background In a superconducting magnet system, a current lead is a key component for connecting a room temperature power supply and a low-temperature superconducting magnet, and is responsible for transmitting large current to a magnet coil immersed in liquid helium from a room temperature end, the current transmitted by the current lead to the low-temperature superconducting magnet is larger, generally more than a kiloampere level, because the transmitted current is larger, heat leakage can be generated in the transmission process of the current, the heat leakage refers to that when the traditional current lead transmits the large current, a large amount of heat load can be generated due to the actions of Joule heat and heat conduction, and when the current lead in the superconducting magnet system transmits the large current, a large amount of heat load can be generated due to the actions of Joule heat and heat conduction, and is transmitted into a low-temperature area, so that the liquid helium is severely evaporated, the operation cost is high, and how to effectively reduce the heat leakage from room temperature to the low-temperature area and efficiently utilize the cold quantity generated by the system to dissipate heat is a core problem of designing the high-performance current lead. In the prior art, in order to reduce heat leakage and avoid a large amount of heat load from being transferred into the low-temperature region of the superconducting magnet, the current lead is generally arranged into different line segments in the direction of the lead, for example, a plurality of sections such as a sealing section, a primary cooling section, a secondary cooling section and the like are arranged along the length direction of the lead, and different materials are selected for heat insulation in different sections so as to realize gradient cooling, so that the heat load is reduced and transferred into the low-temperature region of the superconducting magnet, but the common mode only depends on the physical characteristics of the materials to reduce the temperature, the heat dissipation efficiency and the heat insulation capability still have bottlenecks, and the efficiency is lower when the heat dissipation and the heat load insulation are carried out. Therefore, the high current lead wire for the superconducting magnet system in the prior art has the problem of lower efficiency in heat dissipation and heat load isolation. Disclosure of utility model The application aims to solve the problem that the high-current lead wire for the superconducting magnet system in the prior art has lower efficiency in heat dissipation and heat load isolation. In order to solve the technical problems, the embodiment of the application discloses a kiloampere-level large-current-carrying air-cooling current lead which comprises a room-temperature current-carrying part, a fin cooling part, a high-temperature superconductive part and a lead connecting part which are sequentially connected along the length direction of the current lead. The room temperature current-carrying part is electrically connected with the room temperature power supply, and the lead connecting part is electrically connected with the superconducting magnet and is immersed in the liquid helium cavity. The current from the room temperature current carrying part sequentially passes through the room temperature current carrying part, the fin cooling part, the high temperature superconducting part and the lead connecting part to enter the superconducting magnet. And the current lead is internally provided with an air cooling flow passage extending along the extending direction of the lead, one end of the air cooling flow passage extends into the liquid helium cavity, and the other end sequentially penetrates through the high-temperature superconducting part, the fin cooling part and the room-temperature current carrying part and is communicated with the outside. The fin cooling part comprises a fin outer cylinder body and a fin assembly positioned in the fin outer cylinder body, the fin assembly comprises a plurality of fins which are arranged at intervals and extend parallel to the extending direction of the lead, and gaps among the fins and gaps between the fins and the fin outer cylinder body form a cooling channel along the same extending direction of the lead. By adopting the technical scheme, the current lead is equally provided with the multi-stage cooling structures such as the room temperature current carrying part, the fin cooling part, the high temperature superconductive part, the lead connecting part and the like, and when current passes through each part, heat can be dissipated through the ph