A superconducting magnet self-short circuit excitation current lead base and method of installing and using the same

Abstract

The application discloses a superconducting magnet self-short-circuit excitation current lead base and a mounting and using method thereof, relates to the technical field of superconducting magnets, and comprises a fixing seat, a non-fixed positive and negative plug-in assembly is arranged at the inner end of the fixing seat, elastic expansion assemblies are arranged at the upper and lower ends of the non-fixed positive and negative plug-in assembly and are in contact with each other, a current lead rod is inserted into the non-fixed positive and negative plug-in assembly, thereby supporting apart the outer end of the non-fixed positive and negative plug-in assembly, the positive and negative poles of the non-fixed positive and negative plug-in assembly are no longer in contact, a break and short-circuit state switching is formed, the positive and negative poles of the current lead base are in good contact, and the positive and negative poles are rapidly and automatically short-circuited after the current lead rod is pulled out, the problem that it is very difficult to insert the current lead rod and the problem that the positive and negative poles are not in contact are solved, the short-circuit joint does not need to be inserted into the current lead base by using a tool, the positive and negative poles are kept in a short-circuit state, when excitation is needed, the short-circuit joint does not need to be taken out and inserted into the current lead rod by using a tool, the operation is extremely convenient, and a safety hazard is eliminated.

Description

Technical Field

[0001] This invention relates to the field of superconducting magnet technology, specifically to a superconducting magnet self-short-circuit excitation current lead base and its installation and usage method. Background Technology

[0002] The superconducting magnet excitation current lead base is installed inside the liquid helium chamber. Its upper end is connected to the service tower via a neck tube, and its lower end is connected to the magnet coil via a wire. During excitation, the current lead rod needs to be inserted from the service tower into the current lead base, ensuring good contact between the positive and negative terminals on the current lead rod and the positive and negative terminals on the current lead base. This allows the current from the excitation power supply to be transmitted to the superconducting magnet coil. After excitation is complete and the current lead rod is removed, to ensure the magnet circuit is in a closed-loop state and to protect important components such as the superconducting switch, the positive and negative terminals on the current lead base need to be short-circuited. CN106449002B discloses an ultra-high field superconducting magnet for whole-body magnetic resonance imaging. The upper end of the current lead base is fixed with a male current lead base connector and a female current lead base connector. The male and female current lead base connectors contain male and female current lead rod connectors. The female and male current lead base connectors are connected to the current lead base via springs and locking screws. The male end of the current lead rod mates with the female end of the current lead socket, and the female end of the current lead rod mates with the male end of the current lead socket. An insulating sleeve is provided between the male and female ends of the current lead rod. The short-circuit switch achieves the short-circuit function through the contact between the female and male ends of the current lead socket on the current lead base. In existing current lead bases, the positive and negative terminals are fixed, and the positive and negative terminals are in an open circuit state. When inserting the current lead rod, there are problems such as difficulty in insertion and poor contact. After the current lead rod is pulled out after excitation, a special tool is needed to insert the short-circuit connector into the current lead base to keep the positive and negative terminals in a short-circuit state. When excitation is needed again, the short-circuit connector must be removed with a special tool before the current lead rod can be inserted. Using a special tool to insert and remove the short-circuit connector is not only extremely inconvenient to operate, but also poses a great safety hazard. Therefore, it is urgent for those skilled in the art to design a new type of current lead base. Summary of the Invention

[0003] The problem this invention aims to solve is a self-short-circuiting excitation current lead base for superconducting magnets. This base ensures good contact between the positive and negative poles and allows for rapid and automatic short-circuiting of the positive and negative poles after the current lead rod is removed. It effectively solves the problems of difficulty in inserting the current lead rod and poor contact. It eliminates the need for special tools to insert the short-circuit connector into the current lead base, keeping the positive and negative poles in a short-circuit state. When excitation is needed again, there is no need to first remove the short-circuit connector and insert the current lead rod with special tools. The operation is extremely convenient, effectively eliminating safety hazards.

[0004] To address the aforementioned problems, this invention provides a superconducting magnet self-short-circuit excitation current lead base, comprising a fixed base, an inner end of which is provided with a non-fixed positive and negative pole plug-in assembly, the non-fixed positive and negative pole plug-in assembly extending upward to the upper end of the fixed base, the upper and lower ends of the non-fixed positive and negative pole plug-in assembly being provided with contacting elastic telescopic components, a current lead rod being inserted into the non-fixed positive and negative pole plug-in assembly to open the outer end of the non-fixed positive and negative pole plug-in assembly, so that the positive and negative poles of the non-fixed positive and negative pole plug-in assembly no longer contact each other, forming a switching between open and short-circuit states.

[0005] Preferably, the non-fixed positive and negative plug-in assembly includes a negative electrode outer sleeve and a positive electrode central shaft. The positive electrode central shaft is located at the center of the negative electrode outer sleeve, and the lower end of the positive electrode central shaft is fixed in a guide groove in the fixing seat.

[0006] Preferably, the negative electrode outer sleeve includes at least two negative electrode clips, which are arranged in a mirror image to form a ring structure, and the lower end of the negative electrode clips is disposed in a guide groove.

[0007] Preferably, a gap is provided between the negative electrode clips.

[0008] Preferably, the elastic telescopic component includes an upper elastic clamping part and a lower elastic telescopic part. The upper elastic clamping part is disposed in the clamping groove at the upper end of the negative electrode clip, and the lower elastic telescopic part is disposed at the inner end of the fixing base and extends into the guide groove to elastically contact the lower end of the negative electrode clip.

[0009] Preferably, the upper elastic clamping part is a snap ring.

[0010] Preferably, the lower elastic telescopic part includes a spring guide seat, a compression spring and a pointed set screw. The outer edge of the spring guide seat is provided with a compression spring. One end of the spring guide seat is located in the inner end of the fixed seat and is fixed by the pointed set screw. The spring guide seat extends into the guide groove and is inserted into the slot at the lower end of the negative electrode clip.

[0011] Preferably, the fixed base and the non-fixed positive and negative electrode plug-in assembly are provided with mounting holes at their bottom ends. The mounting holes include a wire bonding hole at the bottom of the negative electrode outer sleeve, a fixed base mounting hole, and a positive electrode central shaft mounting hole.

[0012] Preferably, the mounting base is made of 304 stainless steel and is formed as a single piece.

[0013] Preferably, both the negative electrode outer sleeve and the positive electrode central shaft are cast in one piece from copper, which improves the conductivity of the negative electrode outer sleeve and the positive electrode central shaft.

[0014] Preferably, the outer surfaces of the negative electrode jacket and the positive electrode central axis are plated with gold to ensure conductivity and prevent oxidation.

[0015] The advantages of using the above structure are as follows:

[0016] The positive and negative electrode plug-in assembly of the current lead base of this invention adopts a non-fixed design. Under the action of the elastic telescopic assembly, the current lead rod is inserted into the positive and negative electrode plug-in assembly, thereby opening the negative electrode outer sleeve. This not only makes plugging and unplugging easy, but also ensures good contact effect.

[0017] When the current lead base of this invention is not inserted, the positive and negative terminals of the non-fixed positive and negative electrode plug-in assembly are in a short-circuit state. After the current lead rod is inserted, the negative electrode outer sleeve is opened, so that the positive and negative terminals of the non-fixed positive and negative electrode plug-in assembly are no longer in contact, forming an open circuit state, and normal energization can be performed. After energization is completed and the current lead rod is pulled out, the negative electrode outer sleeve automatically retracts under the action of the compression spring of the lower elastic telescopic part and the snap ring of the upper elastic clamping part, so that the positive and negative terminals immediately return to the short-circuit state. This ensures good contact between the positive and negative terminals of the current lead base and rapid automatic short-circuiting of the positive and negative terminals after the current lead rod is pulled out. It can effectively solve the problem of difficulty in inserting the current lead rod and poor contact. There is no need to use special tools to insert the short-circuit connector into the current lead base to keep the positive and negative terminals in a short-circuit state. When energization is needed again, there is no need to first remove the short-circuit connector with special tools to insert the current lead rod. The operation is extremely convenient and effectively eliminates safety hazards. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the superconducting magnet self-short-circuit excitation current lead base of the present invention.

[0019] Figure 2 This is an internal cross-sectional view of the base of the superconducting magnet self-short-circuit excitation current lead of the present invention.

[0020] Figure 3 This is a bottom view of the base of the superconducting magnet self-short-circuit excitation current lead of the present invention.

[0021] Figure 4 This is a schematic diagram illustrating the installation and use method of the superconducting magnet self-short-circuit excitation current lead base of the present invention.

[0022] In the diagram: 1-Fixed base, 11-Guide groove, 2-Non-fixed positive and negative electrode plug-in assembly, 21-Negative electrode outer sleeve, 22-Positive electrode central shaft, 23-Negative electrode clip, 3-Elastic telescopic assembly, 31-Upper elastic clamping part, 32-Lower elastic telescopic part, 33-Spring guide seat, 34-Compression spring, 35-Pointed set screw, 4-Wire bonding hole, 5-Fixed base mounting hole, 6-Shaft mounting hole. Detailed Implementation

[0023] The present invention will be further explained and described below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1-3 As shown, a superconducting magnet self-short-circuit excitation current lead base includes a fixed base 1. The fixed base 1 has a non-fixed positive and negative pole plug-in assembly 2 at its inner end. The non-fixed positive and negative pole plug-in assembly 2 extends upward to the upper end of the fixed base 1. The upper and lower ends of the non-fixed positive and negative pole plug-in assembly 2 have contacting elastic telescopic components 3. A current lead rod is inserted into the non-fixed positive and negative pole plug-in assembly 2, thereby opening the outer end of the non-fixed positive and negative pole plug-in assembly 2, preventing contact between the positive and negative poles and creating a switch between open and short-circuit states. The non-fixed design of the positive and negative pole plug-in assembly, under the action of the elastic telescopic component 3, allows the current lead rod to be inserted into the positive and negative pole plug-in assembly 2, thereby opening the negative pole outer sleeve 21. This not only makes plugging and unplugging easy but also ensures good contact.

[0025] The non-fixed positive and negative plug-in assembly 2 includes a negative outer sleeve 21 and a positive central shaft 22. The positive central shaft 22 is located at the center of the negative outer sleeve 21, and the lower end of the positive central shaft 22 is fixed in the guide groove 11 in the fixing seat 1.

[0026] The negative electrode outer sleeve 21 includes at least two negative electrode clips 23, which are arranged in a mirror image to form a ring structure. The lower end of each negative electrode clip 23 is located in a guide groove 11, and there is a gap between the negative electrode clips 23.

[0027] The elastic telescopic component 3 includes an upper elastic clamping part 31 and a lower elastic telescopic part 32. The upper elastic clamping part 31 is disposed in the clamping groove at the upper end of the negative electrode clamp 23, and the lower elastic telescopic part 32 is disposed at the inner end of the fixing base 1 and extends into the guide groove 11 to elastically contact the lower end of the negative electrode clamp 23.

[0028] The upper elastic clamping part 31 is a snap ring, and the lower elastic telescopic part 32 includes a spring guide seat 33, a compression spring 34 and a pointed set screw 35. The outer edge of the spring guide seat 33 is provided with a compression spring 34. One end of the spring guide seat 33 is located in the inner end of the fixed seat 1 and is fixed by the pointed set screw 35. The spring guide seat 33 extends into the guide groove 11 and is inserted into the slot at the lower end of the negative electrode clip 23.

[0029] The fixed base 1 and the non-fixed positive and negative electrode plug-in assembly 2 are both provided with mounting holes at their bottom ends. The mounting holes include the wire bonding hole at the bottom of the negative electrode outer sleeve, the fixed base mounting hole, and the positive electrode central shaft mounting hole.

[0030] The mounting base 1 is made of 304 stainless steel and is formed as a single piece.

[0031] Both the negative electrode outer sleeve 21 and the positive electrode central shaft 22 are cast in one piece from copper, which improves the conductivity of the negative electrode outer sleeve and the positive electrode central shaft.

[0032] The outer surfaces of the negative electrode jacket 21 and the positive electrode central shaft 22 are plated with gold to ensure conductivity and prevent oxidation.

[0033] To facilitate understanding of the above technical solutions of the present invention, the following detailed description of the above technical solutions of the present invention will be provided through specific usage methods.

[0034] The specific work process is as follows: Figure 4 As shown, during assembly, first tighten the pointed set screw 35 of the lower elastic telescopic part 32 of the elastic telescopic component 3 to fix the spring guide seat 33 in the fixed seat 1. Then, place the negative electrode outer sleeve 21 of the non-fixed positive and negative electrode plug-in component 2 into the guide groove 11 of the fixed seat 1, and insert the spring guide seat 33 into the slot at the lower end of the negative electrode outer sleeve 21. Then, install the positive electrode central shaft part 22 into the middle position of the negative electrode outer sleeve 21. Finally, install the upper elastic clamping part 31 into the clamping groove at the upper end of the negative electrode outer sleeve. After assembly, the current lead rod needs to be inserted and removed multiple times to test the current. Check whether the negative electrode clip 23 of the negative electrode outer sleeve 21 on the lead base can open and retract normally; after confirming that there are no problems, solder the positive and negative electrode wires into the soldering holes at the bottom of the negative electrode outer sleeve 21 respectively, and insert the current lead rod again. First, use a megohmmeter to check whether there is insulation between the positive and negative electrodes of the current lead rod, and then use a milliohmmeter to measure the resistance between the positive and negative electrodes of the current lead rod and the corresponding output wires of the current lead base. It is required to be less than the specified value. After passing the test, install it into the corresponding terminal block in the superconducting magnet through the mounting holes of the fixing base and the positive electrode central shaft, and then connect the circuit.

[0035] When in use, the positive and negative terminals of the positive and negative terminals of the current lead base are short-circuited when the current lead rod is not inserted. After the current lead rod is inserted, the negative terminal clip 23 of the negative terminal outer sleeve 21 will be opened, so that the positive and negative terminals of the negative terminal outer sleeve 21 and the positive terminal central shaft 22 will no longer be in contact, forming an open circuit state, and the current can be energized normally. After the energization is completed and the current lead rod is pulled out, the negative terminal outer sleeve will automatically retract under the action of the upper elastic clamping part 31 and the lower elastic telescopic part 32, so that the positive and negative terminals will immediately return to the short circuit state.

[0036] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0037] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement 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 present 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 of the invention described herein.

Claims

1. A base for a superconducting magnet self-short-circuit excitation current lead, comprising a fixing base (1), characterized in that: The fixed base (1) is provided with a non-fixed positive and negative pole plug-in assembly (2) at its inner end. The non-fixed positive and negative pole plug-in assembly (2) extends upward to the upper end of the fixed base (1). The non-fixed positive and negative pole plug-in assembly (2) is provided with elastic telescopic assemblies (3) in contact at its upper and lower ends. A current lead rod is inserted into the non-fixed positive and negative pole plug-in assembly (2) to open the outer end of the non-fixed positive and negative pole plug-in assembly (2), so that the positive and negative poles of the non-fixed positive and negative pole plug-in assembly (2) no longer contact each other, forming a switch between open and short circuit states. The non-fixed positive and negative plug-in assembly (2) includes a negative outer sleeve (21) and a positive central shaft (22). The positive central shaft (22) is located at the center of the negative outer sleeve (21), and the lower end of the positive central shaft (22) is fixed in the guide groove (11) in the fixed base (1). The negative electrode outer sleeve (21) includes at least two negative electrode clips (23), which are arranged in a mirror image to form a ring structure. The lower end of the negative electrode clips (23) is located in the guide groove (11). There is a gap between the negative electrode clips (23).

2. The superconducting magnet self-short-circuit excitation current lead base according to claim 1, characterized in that: The elastic telescopic assembly (3) includes an upper elastic clamping part (31) and a lower elastic telescopic part (32). The upper elastic clamping part (31) is located in the clamping groove at the upper end of the negative electrode clamp (23). The lower elastic telescopic part (32) is located at the inner end of the fixing base (1) and extends into the guide groove (11) to elastically contact the lower end of the negative electrode clamp (23).

3. The superconducting magnet self-short-circuit excitation current lead base according to claim 2, characterized in that: The upper elastic clamping part (31) is a snap ring.

4. The superconducting magnet self-short-circuit excitation current lead base according to claim 2, characterized in that: The lower elastic telescopic part (32) includes a spring guide seat (33), a compression spring (34) and a pointed set screw (35). The outer edge of the spring guide seat (33) is provided with a compression spring (34). One end of the spring guide seat (33) is located in the inner end of the fixed seat (1) and is fixed by the pointed set screw (35). The spring guide seat (33) extends into the guide groove (11) and is inserted into the slot at the lower end of the negative electrode clip (23).

5. The superconducting magnet self-short-circuit excitation current lead base according to claim 4, characterized in that: The fixed base (1) and the non-fixed positive and negative pole plug-in assembly (2) both have mounting holes at their bottom ends.

6. The superconducting magnet self-short-circuit excitation current lead base according to claim 1, characterized in that: Both the negative electrode outer sleeve (21) and the positive electrode central shaft (22) are made of copper as a single-piece structure.

7. The installation and use method of the superconducting magnet self-short-circuit excitation current lead base for switching between open and short-circuit states according to claim 5, characterized in that: Includes the following steps; S1. During assembly, first tighten the pointed set screw (35) of the lower elastic telescopic part (32) of the elastic telescopic component (3) and fix the spring guide seat (33) in the fixed seat (1); S2. Then, place the negative electrode outer sleeve (21) of the non-fixed positive and negative electrode plug-in assembly (2) into the guide groove (11) of the fixed seat (1), and insert the spring guide seat (33) into the slot at the lower end of the negative electrode outer sleeve (21); S3. Then, the positive electrode central shaft part (22) is installed in the middle position of the negative electrode outer sleeve part (21), and finally the upper elastic clamping part (31) is installed into the clamping groove at the upper end of the negative electrode outer sleeve. S4. After assembly, the current lead rod needs to be inserted and pulled out multiple times to check whether the negative electrode clip (23) of the negative electrode outer sleeve (21) on the current lead base can open and retract normally. S5. After confirming that there are no problems, solder the positive and negative wires into the soldering holes at the bottom of the negative electrode outer sleeve (21) respectively, and insert the current lead rod again. First, use a megohmmeter to check whether the positive and negative poles of the current lead rod are insulated. Then, use a milliohmmeter to measure the resistance between the positive and negative poles of the current lead rod and the corresponding output wires of the current lead base. The resistance should be less than the specified value. After the test is qualified, install it into the corresponding terminal block in the superconducting magnet through the mounting holes of the fixed seat and the mounting holes of the positive pole central shaft, and then connect the circuit. S6. When in use, the positive and negative poles of the positive and negative poles of the current lead base are short-circuited when the current lead rod is not inserted. After the current lead rod is inserted, the negative pole clip (23) of the negative pole outer sleeve (21) will be opened, so that the positive and negative poles of the negative pole outer sleeve (21) and the positive pole central shaft (22) will no longer be in contact, forming an open circuit state, so that the current can be energized normally. After the energization is completed and the current lead rod is pulled out, the negative pole outer sleeve will automatically retract under the action of the upper elastic clamping part (31) and the lower elastic telescopic part (32), so that the positive and negative poles will immediately return to the short circuit state.

Images