KA-level current lead cooling structure connected in series with superconducting coil cooling loop

Abstract

The invention provides a kA-level current lead cooling structure connected in series with a superconducting coil cooling loop, which belongs to the technical field of superconducting magnets and comprises a superconducting magnet coil cooling device assembly and a current lead cooling assembly. The superconducting magnet cooling device assembly adopts a solenoid concentric structure design, so that the cooling efficiency is improved. After the superconducting magnet is cooled, the cooling medium helium is conveyed to the current lead cooling pipeline to provide helium forced flow cooling for the current lead, and after the current lead is cooled, the helium is conveyed back to the double-layer vacuum helium output pipe to form circulation of the cooling medium; and the current lead provides exciting current for the superconducting magnet coil. Through the current lead cooling structure connected in series with the superconducting coil cooling loop, simultaneous cooling of the superconducting magnet part and the current lead is realized, the structural design of cooling equipment is simplified, and the reliability of the device is improved.

Description

Technical Field

[0001] The invention relates to the field of superconducting magnet cryogenic systems, and in particular to a kA-level current lead cooling structure connected in series with a superconducting coil cooling loop. Background Art

[0002] Superconducting magnet coils can transmit electric current without obstruction, can generate high-intensity and stable magnetic fields, and generate less heat and have high energy efficiency. Because of the high current density, superconducting magnet coils are lighter and smaller than conventional magnet coils, saving materials and space, and facilitating transportation and installation. Even though the initial R&D and manufacturing costs of superconducting magnet coils are high, they have high operating efficiency and high resource utilization. If they are put into use for a long time, they will show good economic benefits. In general, superconducting magnet coils are widely used in scientific research, medical imaging, power transmission, nuclear fusion and other fields, and with the optimization of superconducting magnet coil structure and the advancement of technology, their application range is still expanding.

[0003] The normal operation of superconducting magnet coils depends on the zero resistance characteristics of their superconducting materials, so cooling them is very necessary, especially since superconducting magnet coils may overheat during operation. If the cooling system cannot cool them down and take away the heat, irreversible damage may occur to the superconducting coils, leading to magnet failure. Therefore, cooling of superconducting magnet coils is an important part of achieving their high performance and reliability. In addition, superconducting magnet coils require current leads to provide the current required for operation. Since the current leads are responsible for transmitting the energy from the room temperature power supply to the superconducting magnet coils in the low temperature state, this causes a temperature difference between the two ends of the current leads, and the resulting conduction heat leakage increases the heat loss. Based on this, a cooling device for the current leads is also essential.

[0004] In the existing technology, due to the differences in cooling requirements and cooling efficiency between superconducting magnet coils and current leads, the superconducting magnet coils and current leads are mainly cooled separately, which requires a large amount of cooling medium. Commonly used cooling media include liquid helium. At present, liquid helium energy is in short supply, and it is more difficult to obtain, and the cooling cost is also getting higher and higher. Based on this situation, the cooling medium needs to be used sparingly. In addition, the use of different cooling devices for superconducting coils and current leads will not only increase the space of the overall device, but also require more parts and materials, and increase the complexity of the overall cooling structure. In order to obtain a stable cooling effect, each process needs to be strictly controlled. The operating equipment cost is high, and it is difficult to achieve the goal of efficient cooling. Combined cooling will also have technical difficulties such as spatial layout limitations and operating costs. The present invention adopts an optimized cooling circuit through an innovative structural design, so that the superconducting magnet coils and current leads share the cooling medium, which meets the cooling requirements of the two while avoiding the problems of space occupation and low cooling efficiency in the traditional cooling system. Thereby reducing the cooling cost and equipment complexity, and improving the overall efficiency and stability of the system. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a kA-level current lead cooling structure connected in series with the superconducting coil cooling circuit, which forms a unified whole with the cooling pipeline of the current lead and the cooling pipeline of the superconducting magnet, which not only simplifies the structure of the cooling pipeline, but also has high cooling efficiency and saves cooling medium.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A kA-class current lead cooling structure connected in series with a superconducting coil cooling circuit comprises a superconducting magnet coil cooling device assembly and a current lead cooling assembly; the superconducting magnet coil cooling device assembly comprises a double-layer vacuum helium input pipe, a cooling pipeline inlet assembly, an inlet end superconducting joint, a solenoid-type superconducting coil assembly, and an outlet end superconducting joint; the double-layer vacuum helium input pipe is connected to one end of the cooling pipeline inlet assembly for inputting a cooling medium; the other end of the cooling pipeline inlet assembly is connected to the solenoid-type superconducting coil assembly through the inlet end superconducting joint, so that the cooling medium enters the superconducting magnet The current lead cooling assembly comprises a current lead, a current lead cooling pipeline and a double-layer vacuum helium output tube; the cooling medium generated by the refrigeration host is input into the superconducting magnet coil cooling device assembly to cool the solenoid type superconducting coil assembly as a whole, the cooling medium is then output through a single-channel outlet branch pipe, and finally merges and flows into two outlet main pipes, the cooling medium then passes through the outlet main pipes and enters two current lead cooling pipelines to cool the current lead, and then the cooling medium is output to the double-layer vacuum helium output tube and returns to the refrigeration host to complete the unified cooling of the superconducting magnet coil and the current lead.

[0008] Furthermore, the cooling pipeline inlet assembly is connected to the solenoid-type superconducting coil assembly through an inlet-end superconducting joint.

[0009] Furthermore, the solenoid type superconducting coil assembly adopts a solenoid concentric structure arrangement, and the cooling pipeline inlet assembly is connected to the solenoid type superconducting coil assembly through an inlet end superconducting joint and then extended to form a cooling pipeline for cooling the solenoid type superconducting coil assembly. The cooling medium enters the cooling pipeline to cool the superconducting magnet.

[0010] Furthermore, the outlet superconducting joint is connected to and passes through a cooling pipeline for cooling the solenoid-type superconducting coil assembly to form eight single-channel outlet branches.

[0011] Furthermore, five single-channel outlet branch pipes form a group, another three single-channel outlet branch pipes form a group, two groups of single-channel outlet branch pipes are installed on both sides of the superconducting magnet cooling medium outlet end, and each group of single-channel outlet branch pipes converges into an outlet main pipe.

[0012] Furthermore, there are two current leads, and each of the two current leads has a current lead cooling pipeline.

[0013] Furthermore, a pipeline is led out from the lower end of the first current lead cooling pipeline, and after being connected to a pipeline led out from an outlet main pipeline, a medium confluence short pipe is formed, which is connected to an outlet superconducting joint, and the connected outlet superconducting joint is only connected to a single-channel outlet branch pipe.

[0014] Furthermore, a pipeline is led out from the lower end of the second current lead cooling pipeline, and after being connected with the pipeline led out from another outlet main pipeline, a medium confluence short pipe is formed, which is connected to an outlet end superconducting joint, and the connected outlet end superconducting joint is only connected to a single-channel outlet branch pipe.

[0015] Furthermore, the upper ends of the two current lead cooling pipelines are led out and connected through pipelines, and the pipelines are then connected to the double-layer vacuum helium output pipe to output the cooling medium. Through the combination of the superconducting magnet coil cooling device assembly and the current lead cooling assembly, a unified structure of the superconducting magnet cooling pipeline and the current lead cooling pipeline is formed.

[0016] Beneficial effects:

[0017] The present invention adopts an integrated design of the cooling pipeline of the current lead and the cooling pipeline of the superconducting magnet, and the upper ends of the current lead cooling pipelines of the two current leads are connected through pipelines, and the pipelines are further connected to the double-layer vacuum helium output pipe to output the cooling medium, so that the cooling pipeline of the current lead and the cooling pipeline of the superconducting magnet form a unified whole, and the cooling system cools the superconducting magnet and the current lead at the same time, and the parameter requirements of the cooling system can be adjusted according to actual conditions for different cooling requirements. The invention is simple to install, easy to maintain, space-saving, and has a good cooling effect, and well solves the problems of high cooling cost, large workload of operation monitoring, difficult maintenance and repair, and large space occupation caused by using different cooling devices for cooling the current lead and the superconducting magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a kA-level current lead cooling structure connected in series with a superconducting coil cooling loop according to an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a superconducting magnet coil cooling device assembly according to an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of a current lead cooling assembly according to an embodiment of the present invention.

[0021] Among them, the figures are marked as: superconducting magnet coil cooling device assembly 1, current lead cooling assembly 2, double-layer vacuum helium input pipe 11, cooling pipeline inlet assembly 12, inlet end superconducting joint 13, solenoid type superconducting coil assembly 14, outlet end superconducting joint 15, current lead 21, current lead cooling pipeline 22, double-layer vacuum helium output pipe 23. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figure 1 As shown, a kA-class current lead cooling structure connected in series with a superconducting coil cooling circuit in an embodiment of the present invention includes a superconducting magnet coil cooling device assembly 1, a current lead cooling assembly 2, a single-channel outlet branch pipe, an outlet main pipe and a medium converging short pipe.

[0024] like Figure 2As shown, the superconducting magnet coil cooling device assembly 1 comprises a double-layer vacuum helium input pipe 11, a cooling pipeline inlet assembly 12, an inlet end superconducting joint 13, a solenoid type superconducting coil assembly 14 and an outlet end superconducting joint 15. The double-layer vacuum helium input pipe 11 is connected to one end of the cooling pipeline inlet assembly 12 for inputting cooling medium. The other end of the cooling pipeline inlet assembly 12 is connected to the solenoid type superconducting coil assembly 14 through the inlet end superconducting joint 13 and then extended to form a cooling pipeline for cooling the solenoid type superconducting coil assembly 14. The cooling medium enters the superconducting magnet through 8 ports at the same time.

[0025] Preferably, the outlet superconducting joint 15 is connected to and passes through the cooling pipeline of the cooling solenoid superconducting coil assembly 14 to form eight single-channel outlet branches. Five single-channel outlet branches form a group, and the other three single-channel outlet branches form a group. Two groups of single-channel outlet branches are installed on both sides of the outlet end of the superconducting magnet cooling medium. Each group of single-channel outlet branches converges into an outlet main pipe.

[0026] like Figure 3 As shown, the current lead cooling assembly 2 includes a current lead 21 , a current lead cooling pipeline 22 , and a double-layer vacuum helium output pipe 23 .

[0027] Preferably, there are two current leads 21, each of which has a current lead cooling pipeline 22. A pipeline is led out from the lower end of the first current lead cooling pipeline, and after being connected with a pipeline led out from an outlet main pipe, a medium confluence short pipe is formed. The medium confluence short pipe is connected to an outlet end superconducting joint 15, and the connected outlet end superconducting joint 15 is only connected to a single-channel outlet branch pipe; a pipeline is led out from the lower end of the second current lead cooling pipeline 22, and is connected to another outlet main pipe. After the led-out pipelines are connected, a medium confluence short pipe is formed, which is connected to another outlet superconducting joint 15. The connected outlet superconducting joint 15 is only connected to a single-channel outlet branch pipe; the upper ends of the two current lead cooling pipelines 22 are led out and connected through pipelines, and the pipelines are then connected to the double-layer vacuum helium output pipe 23 to output the cooling medium. Through the combination of the superconducting magnet coil cooling device assembly 1 and the current lead cooling assembly 2, a unified structure of the superconducting magnet cooling pipeline and the current lead cooling pipeline is formed.

[0028] In this embodiment, when in use, the cooling medium generated by the refrigeration main unit is input into the superconducting magnet coil cooling device assembly 1 to cool the solenoid type superconducting coil assembly 14 as a whole. The cooling medium is then output through the single-channel outlet branch pipe and merged into two outlet main pipes. The cooling medium then passes through the outlet main pipes and enters two current lead cooling pipelines 22 to cool the current lead 21. Then, the cooling medium is output to the double-layer vacuum helium output pipe 23 and returns to the refrigeration main unit to complete the unified cooling of the superconducting magnet coil and the current lead.

[0029] The double-layer vacuum helium input pipe 11 in the superconducting magnet coil cooling device assembly 1 is the inlet of the cooling medium, and the double-layer vacuum helium output pipe 23 of the current lead cooling assembly 2 is the outlet of the cooling medium. The double-layer vacuum helium input pipe 11 and the double-layer vacuum helium output pipe 23 have good sealing performance and thermal insulation performance.

[0030] Preferably, the solenoid-type superconducting coil assembly 14 and its cooling pipeline adopt a solenoid structure, which has the advantages of strong stability, high cooling efficiency, and saving installation space.

[0031] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A kA-class current lead cooling structure connected in series with a superconducting coil cooling loop, characterized in that: The invention comprises a superconducting magnet coil cooling device component and a current lead cooling component; the superconducting magnet coil cooling device component comprises a double-layer vacuum helium input pipe (11), a cooling pipeline inlet component (12), an inlet end superconducting joint (13), a solenoid type superconducting coil component (14), and an outlet end superconducting joint (15); the double-layer vacuum helium input pipe (11) is connected to one end of the cooling pipeline inlet component (12) for inputting cooling medium; the other end of the cooling pipeline inlet component (12) is connected to the solenoid type superconducting coil component (14) through the inlet end superconducting joint (13) so that the cooling medium enters the superconducting magnet; the current lead cooling component (2) comprises a current lead (21), a current lead cooling pipeline (22), and a double-layer vacuum helium output pipe (23); low-temperature helium passes through the connecting pipeline of the main helium forced flow outlet main pipe into the cooling pipelines of the two current leads (21) to cool the current leads, and then the cooling medium is output to the double-layer vacuum helium output pipe (5) and returns to the refrigeration host to form a cycle.

2. A kA-class current lead cooling structure connected in series with a superconducting coil cooling loop according to claim 1, characterized in that: The cooling pipeline inlet assembly (12) is connected to the solenoid-type superconducting coil assembly (14) via an inlet-end superconducting joint (13).

3. The kA-class current lead cooling structure connected in series with the superconducting coil cooling loop according to claim 1, characterized in that: The solenoid-type superconducting coil assembly (14) is arranged in a solenoid concentric structure. The cooling pipeline inlet assembly (12) is connected to the solenoid-type superconducting coil assembly (14) through an inlet end superconducting joint (13) and then extended to form a cooling pipeline for cooling the solenoid-type superconducting coil assembly (14). A cooling medium enters the cooling pipeline to cool the superconducting magnet.

4. The kA-class current lead cooling structure connected in series with the superconducting coil cooling loop according to claim 1, characterized in that: The outlet superconducting joint (15) is connected to and passes through a cooling pipeline for cooling a solenoid-type superconducting coil assembly (14), thereby forming eight single-channel outlet branches.

5. The kA-level current lead cooling structure connected in series with the superconducting coil cooling loop according to claim 1, characterized in that: Five single-channel outlet branch pipes form a group, and another three single-channel outlet branch pipes form a group.

6. A kA-class current lead cooling structure connected in series with a superconducting coil cooling loop according to claim 5, characterized in that: Two groups of single-channel outlet branch pipes are installed on both sides of the outlet end of the superconducting magnet cooling medium, and each group of single-channel outlet branch pipes is gathered into an outlet main pipe.

7. The kA-class current lead cooling structure connected in series with the superconducting coil cooling loop according to claim 1, characterized in that: There are two current leads (21) in total, and each of the two current leads (21) has a current lead cooling pipeline (22).

8. The kA-class current lead cooling structure connected in series with the superconducting coil cooling loop according to claim 7, characterized in that: A pipeline is led out from the lower end of the first current lead cooling pipeline, and after being connected to a pipeline led out from an outlet main pipeline, a medium converging short pipe is formed, which is connected to an outlet end superconducting joint (15), and the connected outlet end superconducting joint (15) is only connected to a single-channel outlet branch pipe.

9. A kA-class current lead cooling structure connected in series with a superconducting coil cooling loop according to claim 8, characterized in that: A pipeline is led out from the lower end of the second current lead cooling pipeline, and after being connected to the pipeline led out from another outlet main pipeline, a medium converging short pipe is formed, which is connected to an outlet end superconducting joint (15), and the connected outlet end superconducting joint (15) is only connected to a single-channel outlet branch pipe.

10. The kA-class current lead cooling structure connected in series with a superconducting coil cooling loop according to claim 1, characterized in that: The upper ends of the two current lead cooling pipelines (22) are led out and connected through pipelines, which are then connected to a double-layer vacuum helium output pipe (23) to output the cooling medium. The superconducting magnet coil cooling device assembly (1) and the current lead cooling assembly (2) are combined to form a unified structure of the superconducting magnet cooling pipeline and the current lead cooling pipeline.

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