CN114156039A

CN114156039A - Superconducting magnet comprehensive function service tower

Info

Publication number: CN114156039A
Application number: CN202111616462.2A
Authority: CN
Inventors: 徐风雨; 马君耀; 孙益; 袁君辉; 王太佩
Original assignee: Jiangsu Jingkai Zhongke Superconduction High Technology Co ltd
Current assignee: Jiangsu Jingkai Zhongke Superconduction High Technology Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-03-08

Abstract

The invention discloses a comprehensive function service tower of a superconducting magnet, which comprises a room temperature flange, a primary flange, a secondary flange, an upper corrugated pipe, a lower corrugated pipe, a gas box, 2 room temperature electrodes, a refrigerant liquid injection port, a connecting structure and 2 high-temperature superconducting current leads, wherein the room temperature flange is arranged on the upper end of the room temperature flange; a refrigerating machine cold head assembly is inserted into the service tower through a room temperature flange; the gas box is arranged on the top end face of the room temperature flange, the two room temperature electrodes and the refrigerant liquid injection port are arranged on the gas box, and the two room temperature electrodes are respectively connected with two high-temperature superconducting current leads of which the other ends are electrically connected with the superconducting coil through a connecting structure. The service tower integrates all external interfaces of the superconducting magnet, and the diameter is reduced to a greater extent; the whole structure becomes simpler, the dimensional accuracy is easier to ensure in the assembling process, and the welding is more convenient to implement; in the process of assembling the service tower into the helium container, the cold head room temperature jack of the refrigerating machine with a larger diameter can be fully utilized as an operation space.

Description

Superconducting magnet comprehensive function service tower

Technical Field

The invention belongs to the technical field of superconducting magnets, and particularly relates to a superconducting magnet comprehensive function service tower integrating a mechanical interface and an electrical interface.

Background

The superconducting magnets currently used in the industrial and medical imaging fields are still mainly cooled by liquid helium. The invention is a key component of the superconducting magnet, and the integral seal except the interface adopts a welding form. The general structure of a superconducting magnet of the above type may be described as follows: the superconducting coils or coil sets are enclosed in a helium vessel and cooled with liquid helium; the helium vessel is surrounded by a cold shield, the cold shield is surrounded by a vacuum vessel, and the cold shield is used for eliminating most of radiation heat leakage on the helium vessel; the enclosed space between the helium vessel and the vacuum vessel is called a sandwich vacuum to improve the thermal insulation properties of the magnet. The superconducting coil current in the helium container needs to be led in from the outside of the vacuum container, the monitoring signal needs to be led out from the outside of the vacuum container, liquid helium needs to be injected into the helium container from the outside of the vacuum container initially, and a helium refrigerator is needed to produce the liquid helium in the helium container when the magnet works normally. The pumping port of the interlayer vacuum needs to be arranged on the surface of the vacuum container, and the monitoring signal needs to be led out of the vacuum container. It is common practice to integrate all the interfaces connecting the helium vessel and the interlayer with the outside into an upper surface that is cylindrical in appearance. The superconducting magnet used in the above-mentioned field has a hollow cylinder body, the integrated component is usually vertically arranged at the axial center position of the outer surface of the body part, the name of the integrated component is neck tube or neck tube combination which is naturally formed historically, and the service tower corresponds to English translation, and is often used in more formal occasions. Single service tower structures are most popular due to the significant advantages in low temperature heat leakage.

The main designer of the invention has applied to the Chinese patent office in 2018 for the invention patent of 'a neck tube combination structure with compact structure', and has obtained patent rights in 2020 (patent number CN 108806916B). The patent part finds the following problems in the implementation process:

1. due to space limitation, the welding quality between the transition connecting piece and the side wall of the upper corrugated pipe and between the transition connecting piece and the room temperature flange is difficult to ensure;

2. the movement space of the copper lead is limited after the copper lead passes through the transition connecting piece, so that the vacuum sealing connection between the normal-temperature electrode and the room-temperature flange is difficult after the normal-temperature electrode is connected with the copper lead.

Disclosure of Invention

The invention aims to provide a superconducting magnet comprehensive function service tower with a more reasonable assembly process for a liquid helium cooling superconducting magnet, so as to solve the problems of the original patent products.

A helium vessel outer cylinder 203, a cold shield outer cylinder 202, a superconducting magnet of a vacuum vessel outer cylinder 201,

the invention is realized by the following technical scheme:

a superconducting magnet comprehensive function service tower 101 is used for being installed on a superconducting magnet of which the exterior is a helium container 203, a cold shield 202 and a vacuum container 201 from inside to outside, and the service tower 101 comprises a room temperature flange 1, a primary flange 2, a secondary flange 3, an upper corrugated pipe 4, a lower corrugated pipe 5, a

gas box

6, 2 room temperature electrodes 7, a refrigerant liquid injection port 8, a connecting structure and 2 high-temperature superconducting current leads 17; the room temperature flange 1, the upper corrugated pipe 4, the primary flange 2, the lower corrugated pipe 5 and the secondary flange 3 are welded together in sequence, and the interiors of the room temperature flange 1, the upper corrugated pipe 4, the primary flange 2, the lower corrugated pipe 5 and the secondary flange are communicated with each other to form an inner space of the service tower 101; the secondary flange 3 is welded to the opening of the helium vessel 203 so that the inner space of the service tower 101 communicates with the inner space of the helium vessel 203; the room temperature flange is provided with a refrigerator cold head room temperature jack K1, a refrigerator cold head assembly 102 is inserted into the service tower 101 through the refrigerator cold head room temperature jack K1, a sealing connection is formed at an orifice of the refrigerator cold head room temperature jack K1, and an interlayer vacuum is formed between the helium container and the vacuum container; the room temperature flange 1, the primary flange 2, the secondary flange 3, the upper corrugated pipe 4 and the lower corrugated pipe 5 are wrapped, a service tower outer cylinder 205 is further arranged on the outer side of the service tower 101, and the room temperature flange 1 is welded with an opening of the vacuum container 201 through the service tower outer cylinder 205, so that the inner space surrounded by the service tower outer cylinder 205 is communicated with the interlayer in a vacuum mode; the gas box 6 is arranged on the top end face of the room temperature flange 1, the two room temperature electrodes 7 and the refrigerant liquid injection port 8 are both arranged on the gas box 6, the refrigerant liquid injection pipe is inserted into the refrigerant liquid injection port 8, and the two room temperature electrodes 7 are respectively connected with two high-temperature superconducting current leads 17 of which the other ends are electrically connected with a superconducting coil of the superconducting magnet through a connecting structure; the connection structure, the two high-temperature superconducting current lead wires 17, and the refrigerant liquid injection tube are all contained in the internal space of the service tower 101.

Preferably, the refrigerator cold head assembly 102 is inserted into service tower 101 through the refrigerator cold head room temperature socket K1 and forms a sealed connection through an O-ring rubber seal at the port of refrigerator cold head room temperature socket K1.

Preferably, the connection structure comprises 2 leads 15 and a first-stage flange electric connector 16, the first-stage flange electric connector 16 is arranged on the first-stage flange 2, the two room-temperature electrodes 7 are respectively connected with the two leads 15, the other ends of the two leads 15 are respectively connected with the two high-temperature superconducting current leads 17 through the two first-stage flange electric connectors 16, and the other ends of the two high-temperature superconducting current leads 17 are respectively connected with the two leads of the superconducting coil to realize the electric connection between the superconducting coil and the outside. More preferably, the lead 15 is a copper lead.

Preferably, the leads 15 are serpentine-shaped with horizontal segments spaced more than 15mm apart and vertical at both ends, so that connection to the room-temperature electrode 7 and the first-stage flange electrical connector 16 is facilitated and facilitated.

Preferably, two feed-through electrodes, i.e., the room-temperature electrode 7 and the liquid injection socket, i.e., the refrigerant liquid injection port 8, are located on the upper surface of the gas cartridge, and the two room-temperature electrodes 7 are arranged on both sides of the refrigerant liquid injection port 8, so as to give the largest operating space for connecting two operations of connecting an external cable and inserting and removing the liquid injection tube.

Preferably, the gas box 6 is welded to the top end face of the room temperature flange 1. More preferably, the gas box is an arc-shaped gas box.

Preferably, the lower portion of the refrigerator cold head assembly 102 further passes through a refrigerator cold head primary flange insertion hole K11 arranged on the primary flange, and the refrigerator cold head room temperature insertion hole K1 and the refrigerator cold head primary flange insertion hole K11 are eccentrically arranged on the room temperature flange and the primary flange.

Preferably, the secondary flange 3 is of a circular ring structure.

Preferably, the room temperature flange 1 is further provided with an interlayer vacuum pumping hole connecting hole K5 and an interlayer vacuum instrument signal socket connecting hole K6; a vacuum pumping port 12 is welded on the interlayer vacuum pumping port connecting hole K5 and is used for vacuumizing the space where the interlayer vacuum exists; and an interlayer vacuum pumping port plug 13 is also arranged in a matching way with the vacuum pumping port 12. Preferably, a sealing structure is formed between the vacuum pumping port plug 13 and the vacuum pumping port 12 through sealing by an O-shaped rubber ring, and is used for sealing the interlayer in a vacuum manner after the vacuum pumping is finished. A sandwich vacuum gauge signal socket 14 is soldered to the sandwich vacuum gauge signal socket connection hole k6 to form a continuous channel for routing the signal wires of the monitoring probe inside the sandwich vacuum to the outside air side of the sandwich vacuum.

Preferably, the primary flange 2 is connected with the opening of the cold shield 202 through a plurality of flexible metal strips 204 distributed circumferentially to form a heat conducting channel.

Preferably, the room temperature flange 1 is further provided with a liquid injection pipe insertion hole k2, a lead wire through hole k3 and an air guide hole k4, the liquid injection pipe insertion hole k2, the lead wire through hole k3 and the air guide hole k4 are all enclosed in the air box 6, and the hole enclosed by the air box 6 is also enclosed by a corrugated pipe below the room temperature flange so as to be positioned in the inner space of the service tower 101; the liquid injection pipe insertion hole k2 is used for the refrigerant liquid injection pipe inserted from the refrigerant liquid injection port 8 to pass through; the lead through hole k3 is used for the connection structure to pass through; the gas guide hole k4 is used for increasing the gas flow area from the helium container to the outside; preferably, the gas box 6 is located as close as possible to the refrigerator coldhead room temperature socket k1 so that the service tower 101 has a smaller maximum diameter.

The primary flange 2 is also provided with a primary flange jack k12 of a liquid injection pipe, a primary flange electric connector through hole k13, a primary flange air vent k14 and a primary flange signal wire through hole k15 in a way of being matched with the through hole on the room temperature flange; the liquid injection pipe primary flange jack k12, the primary flange electric connector through hole k13, the primary flange air vent k14 and the primary flange signal line through hole k15 are also positioned in the inner space of the service tower 101; the primary flange electrical connector through hole k13 is used for arranging the primary flange electrical connector 16, and the primary flange air guide hole k14 is matched with the air guide hole k4 on the room temperature flange 1 for increasing the flow area from the helium container to the gas box. More preferably, the number of the primary flange air vents k14 and the number of the air vents k4 on the room temperature flange 1 are at least 2, and most preferably 4. The primary flange signal wire through hole k15 is used for matching with any one of the air guide holes k4 on the room temperature flange 1 to form a continuous channel, and a signal wire of the monitoring probe inside the helium container is led to the air side outside the helium container.

Preferably, a small hole, namely a thin rod fixing hole k16 is further arranged beside the primary flange signal wire through hole k15 on the primary flange, and is used for fixing a thin rod between the primary flange and the secondary flange so as to fix a signal wire from the inside of the helium container.

Preferably, the liquid injection pipe insertion hole k2 on the room temperature flange 1 and the liquid injection pipe first-stage flange insertion hole k12 on the first-stage flange 2 are coaxially arranged.

Preferably, the room temperature flange 1 and the primary flange 2 are fixedly connected by a screw.

Preferably, the gas box 6 is also provided with a KF40 quick-connection flange 9, a gas supplementing valve connecting pipe 10 and a helium container inner instrument signal socket 11.

Preferably, the refrigerator cold head assembly 102 comprises a refrigerator cold head 21, a primary cold head heat-conducting connector 22 and a secondary cold head condenser 23 which are connected in sequence.

Preferably, the refrigerating machine cold head 21 is in heat conduction connection with the primary flange 2 through the primary cold head heat conduction connecting piece 22; under normal operating conditions, the secondary coldhead condenser 23 functions to condense ambient cold helium gas to form liquid helium.

The invention has the beneficial effects that:

the comprehensive function service tower for the superconducting magnet is ingenious in structure, integrates all external interfaces of the superconducting magnet, and reduces the diameter to a greater extent; the integral structure becomes more concise, the dimensional precision is easier to ensure in the assembling process, and the welding is more convenient to implement; in the process of assembling the service tower into the helium container, the cold head room temperature jack of the refrigerating machine with larger diameter can be fully utilized as an operation space; in addition, the total area of the holes on the room-temperature flange and the primary flange ensures smooth airflow from the helium container to the outside, thereby ensuring the safety of superconducting magnet equipment under the condition of coil quench; and including the high-temperature superconducting current lead wire, the theoretical value of the heat leakage of the service tower to the helium container is less than 0.38W, and the use result on the superconducting magnet product shows that the actual heat leakage conforms to the theoretical value, the effect is good, and the practicability is strong.

Drawings

For ease of illustration, the invention is described in detail by the following specific examples and figures.

FIG. 1 is a perspective view of an embodiment of a service tower as a stand-alone component;

FIG. 2 is a longitudinal sectional view of FIG. 1;

FIG. 3 is a top view of the service tower room temperature flange;

FIG. 4 is a top view of a primary flange of the service tower;

FIG. 5a is a front view of a lead;

FIG. 5b is a top view of the lead;

FIG. 6 is a partial cross-sectional view of the service tower mounted to the superconducting magnet;

fig. 7 is a schematic perspective view of a refrigerator cold head assembly.

Detailed Description

As shown in fig. 1-7, a superconducting magnet comprehensive function service tower 101 is used for being installed on a superconducting magnet of which the exterior is a helium container 203, a cold shield 202 and a vacuum container 201 from inside to outside, and the service tower 101 comprises a room temperature flange 1, a primary flange 2, a secondary flange 3, an upper corrugated pipe 4, a lower corrugated pipe 5, a

gas box

6, 2 room temperature electrodes 7, a refrigerant liquid injection port 8, a connection structure and 2 high-temperature superconducting current leads 17; the room temperature flange 1, the upper corrugated pipe 4, the primary flange 2, the lower corrugated pipe 5 and the secondary flange 3 are welded together in sequence, and the interiors of the room temperature flange 1, the upper corrugated pipe 4, the primary flange 2, the lower corrugated pipe 5 and the secondary flange are communicated with each other to form an inner space of the service tower 101; the secondary flange 3 is welded to the opening of the helium vessel 203 so that the inner space of the service tower 101 communicates with the inner space of the helium vessel 203; the room temperature flange is provided with a refrigerator cold head room temperature jack K1, a refrigerator cold head assembly 102 is inserted into the service tower 101 through the refrigerator cold head room temperature jack K1, a sealing connection is formed at an orifice of the refrigerator cold head room temperature jack K1, and an interlayer vacuum is formed between the helium container and the vacuum container; the room temperature flange 1, the primary flange 2, the secondary flange 3, the upper corrugated pipe 4 and the lower corrugated pipe 5 are wrapped, a service tower outer cylinder 205 is further arranged on the outer side of the service tower 101, and the room temperature flange 1 is welded with an opening of the vacuum container 201 through the service tower outer cylinder 205, so that the inner space surrounded by the service tower outer cylinder 205 is communicated with the interlayer in a vacuum mode; the gas box 6 is arranged on the top end face of the room temperature flange 1, the two room temperature electrodes 7 and the refrigerant liquid injection port 8 are both arranged on the gas box 6, the refrigerant liquid injection pipe is inserted into the refrigerant liquid injection port 8, and the two room temperature electrodes 7 are respectively connected with two high-temperature superconducting current leads 17 of which the other ends are electrically connected with a superconducting coil of the superconducting magnet through a connecting structure; the connection structure, the two high-temperature superconducting current lead wires 17, and the refrigerant liquid injection tube are all contained in the internal space of the service tower 101.

The refrigerator cold head assembly 102 is inserted into service tower 101 through the refrigerator cold head room temperature socket K1 and forms a sealed connection through an O-ring rubber seal at the refrigerator cold head room temperature socket K1 orifice.

The connection structure comprises 2 leading wires 15 and a first-level flange electric connector 16, the first-level flange electric connector 16 is arranged on the first-level flange 2, the two room-temperature electrodes 7 are respectively connected with the two leading wires 15, the other ends of the two leading wires 15 are respectively connected with the two high-temperature superconducting current leading wires 17 through the two first-level flange electric connectors 16, and the other ends of the two high-temperature superconducting current leading wires 17 are respectively connected with the two leading wires of the superconducting coil to realize the electric connection between the superconducting coil and the outside. More preferably, the lead 15 is a copper lead.

The lead 15 is bent in a snake shape, the horizontal sections are spaced from each other by more than 15mm, and the upper end and the lower end of the lead are vertical, so that the lead is conveniently and easily connected with the room temperature electrode 7 and the first-level flange electric connector 16.

Two feed-through electrodes, namely a room temperature electrode 7 and a liquid injection socket, namely a refrigerant liquid injection port 8 are positioned on the upper surface of the gas box, and the two room temperature electrodes 7 are respectively arranged on two sides of the refrigerant liquid injection port 8, so that the maximum operation space is provided for connecting two operations of an external cable and inserting and pulling the liquid injection pipe.

The gas box 6 is welded on the top end face of the room temperature flange 1. More preferably, the gas box is an arc-shaped gas box.

The lower part of the refrigerator cold head assembly 102 also penetrates through a refrigerator cold head primary flange insertion hole K11 arranged on a primary flange, and the refrigerator cold head room temperature insertion hole K1 and the refrigerator cold head primary flange insertion hole K11 are eccentrically arranged on the room temperature flange and the primary flange.

The room temperature flange 1 is also provided with an interlayer vacuum pumping hole connecting hole K5 and an interlayer vacuum instrument signal socket connecting hole K6; a vacuum pumping port 12 is welded on the interlayer vacuum pumping port connecting hole K5 and is used for vacuumizing the space where the interlayer vacuum exists; and an interlayer vacuum pumping port plug 13 is also arranged in a matching way with the vacuum pumping port 12. And the vacuum pumping port plug 13 and the vacuum pumping port 12 are sealed by an O-shaped rubber ring to form a sealing structure, and the sealing structure is used for vacuum-sealing the interlayer after the vacuum pumping is finished. A sandwich vacuum gauge signal socket 14 is soldered to the sandwich vacuum gauge signal socket connection hole k6 to form a continuous channel for routing the signal wires of the monitoring probe inside the sandwich vacuum to the outside air side of the sandwich vacuum.

The primary flange 2 is connected with the opening of the cold shield 202 through a plurality of flexible metal strips 204 distributed on the circumference to form a heat conducting channel.

The room temperature flange 1 is also provided with a liquid injection pipe insertion hole k2, a lead wire through hole k3 and an air guide hole k4, the liquid injection pipe insertion hole k2, the lead wire through hole k3 and the air guide hole k4 are all enclosed inside the air box 6, and the hole enclosed by the air box 6 is also enclosed by a corrugated pipe below the room temperature flange so as to be positioned in the inner space of the service tower 101; the liquid injection pipe insertion hole k2 is used for the refrigerant liquid injection pipe inserted from the refrigerant liquid injection port 8 to pass through; the lead through hole k3 is used for the connection structure to pass through; the gas guide hole k4 is used for increasing the gas flow area from the helium container to the outside; preferably, the gas box 6 is located as close as possible to the refrigerator coldhead room temperature socket k1 so that the service tower 101 has a smaller maximum diameter.

The primary flange 2 is also provided with a primary flange jack k12 of a liquid injection pipe, a primary flange electric connector through hole k13, a primary flange air vent k14 and a primary flange signal wire through hole k15 in a way of being matched with the through hole on the room temperature flange; the liquid injection pipe primary flange jack k12, the primary flange electric connector through hole k13, the primary flange air vent k14 and the primary flange signal line through hole k15 are also positioned in the inner space of the service tower 101; the primary flange electrical connector through hole k13 is used for arranging the primary flange electrical connector 16, and the primary flange air guide hole k14 is matched with the air guide hole k4 on the room temperature flange 1 for increasing the flow area from the helium container to the gas box. The number of the primary flange air vents k14 and the number of the air vents k4 on the room temperature flange 1 are at least 2, and in the embodiment, the number is 4. The primary flange signal wire through hole k15 is used for matching with any one of the air guide holes k4 on the room temperature flange 1 to form a continuous channel, and a signal wire of the monitoring probe inside the helium container is led to the air side outside the helium container.

And a small hole, namely a thin rod fixing hole k16 is also formed beside the primary flange signal wire through hole k15 on the primary flange and is used for fixing a thin rod between the primary flange and the secondary flange so as to fix a signal wire from the inside of the helium container.

The liquid injection pipe insertion hole k2 on the room temperature flange 1 and the liquid injection pipe first-level flange insertion hole k12 on the first-level flange 2 are arranged coaxially.

The room temperature flange 1 and the first-stage flange 2 are fixedly connected through a screw.

The gas box 6 is also provided with a KF40 quick-connection flange 9, a gas supplementing valve connecting pipe 10 and an instrument signal socket 11 in the helium container.

The refrigerator cold head assembly 102 comprises a refrigerator cold head 21, a primary cold head heat-conducting connector 22 and a secondary cold head condenser 23 which are connected in sequence.

The refrigerator cold head 21 is in heat conduction connection with the primary flange 2 through a primary cold head heat conduction connecting piece 22; under normal operating conditions, the secondary coldhead condenser 23 functions to condense ambient cold helium gas to form liquid helium.

The specific embodiment is as follows:

referring to fig. 1, 2 and 6, a superconducting magnet integrated function service tower 101 includes: the device comprises a room temperature flange 1, a primary flange 2, a secondary flange 3, an upper corrugated pipe 4, a lower corrugated pipe 5, a

gas box

6, 2 room temperature electrodes 7, a refrigerant liquid injection port 8, a KF40 quick-connection flange 9, an aeration valve connecting pipe 10, an instrument signal socket 11 in a helium container, an interlayer vacuum pumping port 12, an interlayer vacuum pumping port plug 13, an interlayer vacuum

instrument signal socket

14, 2 leads 15, 2 primary flange

electric connectors

16 and 2 high-temperature superconducting current leads 17. The room temperature flange 1, the primary flange 2, the upper corrugated pipe 4, the lower corrugated pipe 5 and the secondary flange 3 are sequentially welded together, the inner spaces are communicated with each other, and the gas box 6 is welded on the top end face of the room temperature flange 1. The two room temperature electrodes 7 are respectively connected with two leads 15, the other ends of the two leads 15 are respectively connected with two high temperature superconducting current leads 17 through two first-stage flange electric connectors 16 arranged on the first-stage flange, and the other ends of the two high temperature superconducting current leads 17 are respectively connected with two leads of the superconducting coil, so that the superconducting coil is electrically connected with the outside.

Referring to fig. 3, a top view of the room temperature flange 1, through-holes formed therein include: a refrigerator cold head room temperature jack k1, a liquid injection tube jack k2, a lead wire perforation k3, an air guide hole k4, an interlayer vacuum pumping port connecting hole k5 and an interlayer vacuum instrument signal socket connecting hole k 6. Wherein the through holes k2, k3, k4 are enclosed inside the gas box 6 and the hole enclosed by the gas box 6 is at the same time enclosed by the bellows below the room temperature flange. The gas box is an arc-shaped gas box and is close to a cold head jack of the refrigerator in the middle of the room temperature flange as much as possible, so that the hole surrounded by the gas box is also surrounded by the corrugated pipe below the room temperature flange.

Referring to fig. 4, a top view of the primary flange 2, through holes are formed therein, including: a first-stage flange jack k11 of a refrigerator cold head, a first-stage flange jack k12 of a liquid injection pipe, a first-stage flange electric connector perforation k13, a first-stage flange air-guide hole k14, a first-stage flange signal wire perforation k15 and a thin rod fixing hole k 16.

Referring to fig. 5a and 5b, there are shown a front view and a top view, respectively, of one of the two leads 15. The shape of the other lead 15 is mirror symmetrical to the shape shown in fig. 5a and 5b with respect to the horizontal centre line of fig. 4. The lead 15 is serpentine. The horizontal sections are spaced from each other by more than 15mm, and the upper and lower ends are perpendicular, so that the connection with the room temperature electrode 7 and the first-level flange electric connector 16 is convenient and easy.

Referring to fig. 6 and 2, a partial cutaway view of the service tower after it is mounted to the superconducting magnet. Three parts of the superconducting magnet are shown, namely a helium container 203, a cold shield 202 and a vacuum container 201 from inside to outside. The secondary flange 3 of the service tower 101 is welded with the opening of the helium container 203, and a closed space is formed inside the service tower; the primary flange 2 is connected with the opening of the cold shield outer cylinder 202 through a plurality of flexible metal strips 204 distributed on the circumference to form a heat conduction channel; the room temperature flange 1 is welded with the vacuum container through the service tower outer cylinder 205, and a closed space is formed inside. The space between the vacuum vessel and the helium vessel is evacuated and the space enclosed by the space is also conventionally referred to as a sandwich vacuum.

Referring to fig. 6, 7, 3 and 4, the refrigerator cold head 21, the primary cold head heat-conducting connector 22 and the secondary cold head condenser 23 together form a refrigerator cold head assembly 102, which is then inserted into the service tower 101. The room temperature contact part between the refrigerating machine cold head 21 and the service tower 101 is sealed through an O-shaped ring; the primary cold head is in heat conduction connection with the primary flange through a primary cold head heat conduction connecting piece 22; under normal operating conditions, the secondary cold head condenser 23 acts to condense ambient cold helium gas to form liquid helium.

Therefore, the difference of the patent compared with the original patent is as follows:

1. the original patent is connected with a room temperature flange and a 4K helium container and is provided with three groups of corrugated pipes, including a corrugated pipe where a refrigerator is located, a liquid injection corrugated pipe and a signal line corrugated pipe.

2. The diameter of the corrugated pipe where the refrigerator is located is slightly increased, and the eccentric structure of the cold head jack of the refrigerator is reserved on the room temperature flange and the primary flange, so that more holes are allowed to be added in the area surrounded by the corrugated pipe on the primary flange, wherein 2 holes are used for installing an electric connector for connecting a high-temperature superconducting current lead and a lead, 1 hole is used for inserting a liquid injection pipe, 1 hole is used for penetrating a signal wire, and the rest holes are used as passages for gas flowing. The air box is close to the cold head jack of the refrigerator on the room temperature flange as much as possible, so that the hole surrounded by the air box is also surrounded by the corrugated pipe below the room temperature flange at the same time. Particularly, the hole for inserting the liquid injection pipe is coaxial with the hole for the same purpose on the primary flange; 2 of the holes are used for passing through the lead; the remaining holes serve as channels for gas flow. Compared with the original invention patent, the opening on the side wall of the corrugated pipe is cancelled, the transition connecting pipe is cancelled, the difficulty of threading the lead is further eliminated, and the integral structure is simpler and more compact.

3. Two feed-through electrodes and a liquid injection socket are required to be positioned on the upper surface of the air box, and the two feed-through electrodes are required to be arranged on two sides of the liquid injection socket so as to provide the maximum operation space for connecting an external cable and plugging and unplugging the liquid injection pipe. The other various interfaces, such as the air supplement pipe, the instrument electric feed-through socket and the like are positioned on the outer arc surface of the air box, and the interfaces are arranged according to the principle of convenient connection operation. The two feed-through electrodes are respectively connected with the two leads, the other ends of the two leads are respectively connected with the two high-temperature superconducting current leads on the primary flange through the electric connector, and the other ends of the two high-temperature superconducting current leads are respectively connected with the two leads of the superconducting coil, so that the superconducting coil is electrically connected with the outside.

4. A small hole is added beside a hole of the primary flange for passing through the signal wire, and a thin rod is fixed between the primary flange and the secondary flange. The thin rod is used for fixing a signal wire from the inside of the helium container.

The comprehensive function service tower for the superconducting magnet is ingenious in structure, integrates all external interfaces of the superconducting magnet, and is reduced in diameter to a greater extent; the integral structure becomes more concise, the dimensional precision is easier to ensure in the assembling process, and the welding is more convenient to implement; in the process of assembling the service tower into the helium container, the cold head jack of the refrigerating machine with larger diameter can be fully utilized as an operation space; in addition, the total area of the holes on the room-temperature flange and the primary flange ensures smooth airflow from the helium container to the gas box, so that the safety of superconducting magnet equipment under the condition of coil quench is ensured; and including the high-temperature superconducting current lead wire, the theoretical value of the heat leakage of the service tower to the helium container is less than 0.38W, and the use result on the superconducting magnet product shows that the actual heat leakage conforms to the theoretical value, the effect is good, and the practicability is strong.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims

1. A superconducting magnet comprehensive function service tower is used for being installed on a superconducting magnet of which the exterior is a helium container (203), a cold shield (202) and a vacuum container (201) from inside to outside, and is characterized in that the service tower (101) comprises a room temperature flange (1), a primary flange (2), a secondary flange (3), an upper corrugated pipe (4), a lower corrugated pipe (5), a gas box (6), 2 room temperature electrodes (7), a refrigerant liquid injection port (8), a connecting structure and 2 high-temperature superconducting current leads (17); the room temperature flange (1), the upper corrugated pipe (4), the primary flange (2), the lower corrugated pipe (5) and the secondary flange (3) are welded together in sequence, and the interiors of the two flanges are communicated with each other to form an inner space of the service tower (101); the secondary flange (3) is welded with the opening of the helium vessel (203) so that the inner space of the service tower (101) is communicated with the inner space of the helium vessel (203); the room temperature flange is provided with a refrigerator cold head room temperature jack (K1), a refrigerator cold head assembly (102) is inserted into the service tower (101) through the refrigerator cold head room temperature jack (K1), a sealing connection is formed at an orifice of the refrigerator cold head room temperature jack (K1), and an interlayer vacuum is formed between the helium container and the vacuum container; the outer side of the service tower (101) is further provided with a service tower outer cylinder (205), the room temperature flange (1) is welded with an opening of the vacuum container (201) through the service tower outer cylinder (205), so that the inner space surrounded by the service tower outer cylinder (205) is communicated with the interlayer in a vacuum mode; the gas box (6) is arranged on the top end face of the room-temperature flange (1), the two room-temperature electrodes (7) and the refrigerant liquid injection port (8) are arranged on the gas box (6), the refrigerant liquid injection pipe is inserted into the refrigerant liquid injection port (8), and the two room-temperature electrodes (7) are respectively connected with two high-temperature superconducting current leads (17) of which the other ends are electrically connected with a superconducting coil of the superconducting magnet through a connecting structure; the connecting structure, the two high-temperature superconducting current leads (17) and the refrigerant liquid injection pipe are all contained in the inner space of the service tower (101).

2. The service tower according to claim 1, wherein the connection structure comprises 2 leads (15) and a primary flange electrical connector (16), the primary flange electrical connector (16) is disposed on the primary flange (2), the two room temperature electrodes (7) are respectively connected with the two leads (15), the other ends of the two leads (15) are respectively connected with the two high temperature superconducting current leads (17) through the two primary flange electrical connectors (16), and the other ends of the two high temperature superconducting current leads (17) are respectively connected with the two leads of the superconducting coil of the superconducting magnet to realize the electrical connection of the superconducting coil with the outside.

3. The service tower according to claim 2, characterized in that the lead wires (1) are serpentine, with horizontal sections more than 15mm apart and vertical upper and lower ends.

4. The service tower according to claim 1, wherein 2 room temperature electrodes (7) and the refrigerant injection port (8) are located on the upper surface of the gas box, and the two room temperature electrodes (7) are arranged on both sides of the refrigerant injection port (8).

5. The service tower according to claim 1, characterized in that the gas box (6) is welded on the top end face of the room temperature flange (1), the gas box (6) being an arc-shaped gas box.

6. The service tower according to claim 1, characterized in that the room temperature flange (1) is further provided with an interlayer vacuum pumping port connection hole (K5) and an interlayer vacuum instrument signal socket connection hole (K6); a vacuum pumping port (12) is welded on the interlayer vacuum pumping port connecting hole (K5) and is used for vacuumizing the space where interlayer vacuum exists; a sandwich vacuum pumping port plug (13) is also arranged in a way of matching with the vacuum pumping port (12); a mezzanine vacuum gauge signal socket (14) is soldered to the mezzanine vacuum gauge signal socket connection hole (k 6) to form a continuous channel for routing a signal line of a monitor probe inside the mezzanine vacuum to the outside air side of the mezzanine vacuum.

7. The service tower according to claim 1, characterized in that the primary flange (2) is connected to the opening of the cold shield outer cylinder (202) by a plurality of flexible metal bands (204) distributed circumferentially forming a heat conducting channel.

8. The service tower of claim 1, wherein the room temperature flange (1) is further provided with a liquid injection pipe insertion hole (k 2), a lead wire through hole (k 3) and a gas guide hole (k 4), the liquid injection pipe insertion hole (k 2), the lead wire through hole (k 3) and the gas guide hole (k 4) are all enclosed in the gas box (6), and the hole enclosed by the gas box (6) is also enclosed by a corrugated pipe below the room temperature flange to be located in the inner space of the service tower (101); the liquid injection pipe insertion hole (k 2) is used for the refrigerant liquid injection pipe inserted from the refrigerant liquid injection port (8) to pass through; the lead through hole (k 3) is used for the connection structure to pass through; the gas vent (k 4) is used to increase the gas flow area from the helium vessel to the outside.

9. The service tower of claim 8, wherein the primary flange (2) is further provided with a liquid injection pipe primary flange insertion hole (k 12), a primary flange electric connector through hole (k 13), a primary flange air vent hole (k 14) and a primary flange signal line through hole (k 15) in cooperation with the through hole on the room temperature flange (1); the liquid injection pipe primary flange jack (k 12), the primary flange electric connector through hole (k 13), the primary flange air guide hole (k 14) and the primary flange signal line through hole (k 1) are also positioned in the inner space of the service tower (101); the primary flange electric connector through hole (k 13) is used for arranging a primary flange electric connector (16), and a primary flange air guide hole (k 14) is matched with an air guide hole (k 4) on the room temperature flange (1) to increase the flow area from the helium container to the gas box; the primary flange signal wire through hole (k 15) is used for being matched with a gas guide hole (k 4) on the room temperature flange (1) to form a continuous channel, and a signal wire of a monitoring probe inside the helium container is led to the air side outside the helium container.

10. The service tower according to claim 1, wherein the chiller cold head assembly (102) comprises a chiller cold head (21), a primary cold head thermally conductive connection (22), and a secondary cold head condenser (23) connected in series; the contact part between the refrigerating machine cold head (21) and the service tower (101) and the room temperature flange (1) is sealed through an O-shaped ring; the refrigerator cold head (21) is in heat conduction connection with the primary flange (2) through a primary cold head heat conduction connecting piece (22); the secondary cold head condenser (23) is used for condensing surrounding cold helium gas to form liquid helium under normal operation conditions.