Excitation lead seat of superconducting magnet

Abstract

The utility model discloses a superconducting magnet excitation lead seat, which belongs to the technical field of superconducting magnets and comprises an outer shell and a wiring terminal positioned in the outer shell, the bottom of the outer shell is sequentially connected with a cylinder and a second corrugated pipe, the outer shell comprises a cover plate and a barrel, one end of the wiring terminal is fixedly connected with the cover plate, and the other end of the wiring terminal is fixedly connected with the barrel. The wiring terminal comprises two top plates, the lower end of any top plate is connected with a positive wiring terminal or a negative wiring terminal, the side face of the positive wiring terminal or the negative wiring terminal is provided with a cable interface, the front face of the positive wiring terminal or the negative wiring terminal is provided with an electrode interface, and the cable interface is connected with one end of a cable. The other end of the cable is connected with a copper column electric connector which is located outside the outer shell. The lead seat provided by the utility model is simple in design, and can enable the current lead to reach a superconductive working state.

Description

TECHNICAL FIELD

[0001] The utility model relates to superconducting magnet technical field especially relates to a superconducting magnet excitation lead seat. BACKGROUND

[0002] Excitation is also called magnetization, which means that the superconducting magnet system gradually adds current to the superconducting coil under the action of the magnet power supply, thereby establishing a predetermined magnetic field. Once the excitation is successful, the superconducting magnet coil will provide a strong and highly stable uniform magnetic field for us without consuming energy. For superconducting magnets, successful excitation requires a complete control system. The system is generally composed of excitation current leads, high-precision excitation power supply units, and excitation lead seats, which are important components connecting the current leads and the excitation power supply.

[0003] The superconducting material currently used is mainly a multi-filament composite wire of niobium titanium and copper, which operates at a temperature of 4.2K (-269℃), i.e. the temperature of liquid helium at one atmosphere. Therefore, the superconducting coil must be immersed in liquid helium to work normally. The current leads are also made of a multi-filament composite wire of niobium titanium and copper, but during actual excitation, the current leads, with one end at room temperature of 300K and the other end at low temperature of 4.2K, will generate Ohmic heat when passing through a current of 200~300A, causing the temperature to rise and not reaching the superconducting state of zero resistance. The heat generated may spread to the superconducting coil and cause the loss of superconductivity, resulting in excitation failure.

[0004] A current lead seat for a magnetic resonance superconducting magnet disclosed in Chinese patent CN 219349903 U includes a bottom extension block, a positive pad block, a positive seat, an insulating seat, a negative seat, and a liquid delivery pipe seat stacked from bottom to top. The center of each of the positive pad block, the positive seat, the insulating seat, the negative seat, and the liquid delivery pipe seat is provided with a hollow cavity that penetrates from top to bottom. The top end of the bottom extension block is provided with a blind hole. Each hollow cavity and the blind hole are connected together to form a liquid delivery pipeline. Liquid helium can be delivered to the inside of the magnetic resonance superconducting magnet through the liquid delivery pipeline, which can cool the positive seat and the negative seat to achieve the superconducting state.

[0005] The above design has two shortcomings: first, a part of the cold energy is wasted in the cooling process of the liquid helium; second, the design is complicated and has many connecting components, which may cause many hidden dangers in maintaining the vacuum state of the liquid delivery pipeline, thus further improvement is needed. UTILITY MODEL CONTENTS

[0006] The technical problem to be solved by the utility model is to design an independent liquid helium pipeline lead seat that is simple in design and can make the current lead reach the superconducting state.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme: including shell body and wiring terminal located in the inside of shell body, the bottom of shell body connects cylinder and bellows two in proper order, the shell body includes cover plate and cylinder, one end of wiring terminal is fixedly connected with cover plate, the wiring terminal includes two top plates, and the lower end of any top plate is connected with positive electrode wiring terminal or negative electrode wiring terminal respectively, the side surface of positive electrode wiring terminal or negative electrode wiring terminal is provided with cable interface respectively, and the front surface is provided with electrode interface respectively, the cable interface is connected with one end of cable, the other end of cable is connected with copper column electric connector, and the copper column electric connector is located at the outside of shell body.

[0008] Further, the cover plate is a bimetal cover plate, including a copper cover plate at the top and a stainless steel connecting plate at the side of the copper cover plate.

[0009] Further, the two top plates are mirror image half-round plates, and there is a gap between the two top plates.

[0010] Further, the side of the two top plates is provided with a plurality of threaded connection grooves, and the copper cover plate is provided with bolt holes at the opposite position, and the two top plates and the copper cover plate are connected by bolts.

[0011] Further, the positive electrode wiring terminal and the negative electrode wiring terminal are symmetrically arranged and there is a gap between them.

[0012] Further, the positive electrode wiring terminal or the negative electrode wiring terminal is in a stepped shape, and a plurality of electrode interfaces are arranged on the front surface of each step.

[0013] Further, one end of the cable is connected with the cable interface through the copper nose terminal, and the other end is connected with the copper column electric connector through the superconducting magnet shell.

[0014] Further, the cable is arranged in the bellows, one end of the bellows is connected with the side of the cylinder, and the other end is connected with the superconducting magnet shell. Beneficial effects

[0015] The wiring terminal is arranged in the shell, and the cover plate of the shell body is connected with the cold head of the refrigerator, so that the wiring terminal in the shell can be cooled, and the electrode connected with the wiring terminal can be in a superconducting state; the cover plate of the cylinder is made of bimetal material, the copper part is more conducive to cooling of the refrigerant, and the stainless steel material on the side is more convenient for welding with the cylinder, so as to seal the inside of the cylinder; the cable is placed in the bellows, which can increase the length of the cable and reduce heat conduction; the shape of the wiring terminal is similar to a ladder, and one high-temperature excitation electrode can be installed on each step, and different types of magnet excitation can be met according to the design requirements of the magnet. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structure schematic view of the excitation wiring seat of the utility model.

[0017] Figure 2 It is a sectional structure schematic view of the excitation wiring seat of the utility model.

[0018] Figure 3 It is a structure schematic view of the copper column electric joint and cable connection of the utility model.

[0019] Figure 4 It is a plane structure schematic view of the terminal of the utility model.

[0020] Figure 5 It is a three-dimensional structure schematic view of the terminal of the utility model.

[0021] 1 - shell, 11 - cover plate, 111 - copper cover plate 111, 112 - stainless steel connecting plate, 12 - cylinder, 13 - corrugated pipe two, 14 - cylindrical body, 2 - terminal, 21 - top plate, 211 - threaded connection groove, 22 - positive terminal, 23 - negative terminal, 24 - cable interface, 25 - electrode interface, 3 - cable, 4 - copper column electric joint, 5 - copper nose terminal, 6 - corrugated pipe one, 7 - superconducting magnet shell. DETAILED DESCRIPTION

[0022] In order to strengthen the understanding of the utility model, the utility model will be described in detail below in combination with examples and drawings, and the examples are only used to explain the utility model and do not constitute a limitation on the protection scope of the utility model.

[0023] As Figures 1 to 4 shown is a kind of superconducting magnet excitation lead seat, including shell 1 and the terminal 2 located in the inside of shell 1;Wherein the bottom of shell 1 is welded with hollow cylindrical body 14, the bottom of cylindrical body 14 is welded with threaded pipe two 13 for sealing shell 1.

[0024] Shell 1 includes the cover plate 11 of top and the cylinder 12 of lower part in cover plate 11, cover plate 11 is circular bimetallic cover plate, specifically including copper cover plate 111 located in top and stainless steel connecting plate 112 located in side edge of copper cover plate 111.Copper cover plate 111 upper surface is connected with the cold head of refrigerator, and it is the shell inside terminal of excitation lead seat, and the electrode of connection terminal reaches superconducting state by cooling.But because copper material is not easy to weld, therefore the welding place of cylinder 12 selects stainless steel connecting plate 112.

[0025] The terminal 2 comprises two top plates 21 which are mirror arranged and can form a circle, but there is a gap between the two top plates 21, and the gap is filled with insulation material to prevent the positive and negative terminals from short circuiting. The side edges of the two top plates 21 are provided with a plurality of threaded connection grooves 211 which correspond to bolt holes on the copper cover plate 111, and the two top plates 21 are connected to the copper cover plate 111 by bolts.

[0026] The lower ends of each top plate 21 are connected to a positive terminal 22 or a negative terminal 23, wherein the positive terminal 22 and the negative terminal 23 are symmetrically arranged and there is also a gap between them which is filled with insulation material.

[0027] The side surfaces of the positive terminal 22 and the negative terminal 23 are respectively provided with a cable interface 24, and the cable interface 24 is connected to one end of the cable 3 by a copper nose terminal 5, and the other end of the cable 3 extends out of the superconducting magnet housing 7 and is connected to the copper column electrical connector 4.

[0028] Since the copper column electrical connector 4 is located at the room temperature end of 300K, and the entire excitation terminal is located at the cold end of 4K, in order to reduce heat conduction during excitation, the length of the cable 3 can be increased, and the cable 3 can be sealed in the bellows 6. As shown in Figure 1 One end of the bellows 6 is connected to the outlet of the side cable interface 24 of the cylinder 12, and the body of the bellows 6 can be bent and extended to the desired position. But as shown in Figure 2 and 3 No matter how the bellows 6 extends inside the magnet, the other end of the bellows 6 is connected to the superconducting magnet housing 7, and the connection is located at the lower part of the interface between the copper column electrical connector 4 and the superconducting magnet housing 7, which facilitates the extension of the cable 3 out of the bellows 6 and the connection of the cable 3 to the copper column electrical connector 4.

[0029] As shown in Figure 4 and Figure 5 The appearance of the positive terminal 22 or the negative terminal 23 is in the shape of a ladder, and a plurality of electrode interfaces 25 are arranged on the front surface of each step. The electrode interfaces 25 are connected to high-temperature excitation electrodes, and a plurality of high-temperature excitation electrodes can be connected to the plurality of electrode interfaces 25 on each surface as needed.

[0030] During installation, the terminal 2 is first fixed to the lower part of the cover plate 11, then the high-temperature excitation electrodes are connected to the electrode interfaces 25, and finally the cylinder 14 is welded to the bottom of the cylinder 12, and the bellows 13 is welded to the bottom of the cylinder 14.

[0031] The embodiment of the utility model discloses the preferable embodiment, but is not limited to this, the ordinary skill in the art, the spirit of the utility model is appreciated to the above-mentioned embodiment, and different extension and change are made, but as long as not departing from the spirit of the utility model, all are in the protection scope of the utility model.

Claims

1. A superconducting magnet excitation lead former characterized by, It comprises an outer shell (1) and a terminal (2) inside the outer shell (1), the bottom of the outer shell (1) is connected with a cylinder (14) and a corrugated pipe (13) in turn; The outer shell (1) comprises a cover plate (11) and a cylinder (12), one end of the terminal (2) is fixedly connected with the cover plate (11); The terminal (2) comprises two top plates (21), the lower end of any one of the top plates (21) is connected with a positive terminal (22) or a negative terminal (23) respectively, the side of the positive terminal (22) or the negative terminal (23) is provided with a cable interface (24), and the front is provided with an electrode interface (25) respectively. The cable interface (24) is connected with one end of a cable (3), the other end of the cable (3) is connected with a copper column electrical connector (4), and the copper column electrical connector (4) is located outside the outer shell (1).

2. The superconducting magnet excitation lead bushing of claim 1, wherein, The cover plate (11) is a bimetal cover plate, comprising a copper cover plate (111) at the top and a stainless steel connecting plate (112) at the side of the copper cover plate (111).

3. The superconducting magnet excitation lead bushing of claim 2, wherein, The two top plates (21) are mirror image arranged semicircular plates, and there is a gap between the two top plates (21).

4. The superconducting magnet excitation lead bushing of claim 3, wherein, The side of the two top plates (21) is provided with a plurality of threaded connection grooves (211), and the opposite position of the copper cover plate (111) is provided with a bolt hole, so that the two top plates (21) and the copper cover plate (111) are connected through bolts.

5. The superconducting magnet excitation lead bushing of claim 1, wherein, The positive terminal (22) and the negative terminal (23) are symmetrically arranged and have a gap therebetween.

6. The superconducting magnet excitation lead bushing of claim 5, wherein, The positive terminal (22) and the negative terminal (23) are in the shape of a ladder, and a plurality of electrode interfaces (25) are arranged on the front of each step.

7. The superconducting magnet excitation lead bushing of claim 1, wherein, One end of the cable (3) is connected with the cable interface (24) through a copper nose terminal (5), and the other end penetrates through a superconducting magnet shell (7) and is connected with the copper column electrical connector (4).

8. The superconducting magnet excitation lead bushing of claim 7, wherein, The cable (3) is arranged in a corrugated pipe (6), one end of the corrugated pipe (6) is connected with the side of the cylinder (12), and the other end is connected with the superconducting magnet shell (7).

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