A superconducting magnet with field stabilization

Abstract

The utility model relates to superconducting magnet technical field especially relates to a kind of superconducting magnet of excitation stability, including cryogenic container, normal temperature container and superconducting coil;Normal temperature container is equipped with service tower, and two neck pipes are equipped in service tower;Neck pipe upper end is fixed in service tower and is connected with outside, and the lower end of neck pipe is fixed in cryogenic container and is connected with cryogenic container.The first connecting seat and the second connecting seat are fixed on the superconducting coil, the structure of the first connecting seat is adapted to infusion tube;The structure of the second connecting seat is adapted to current lead wire.The first connecting seat and the second connecting seat are respectively below the inside of two neck pipes.The superconducting magnet of excitation stability of the utility model can simultaneously carry out infusion helium cooling to superconducting magnet during superconducting magnet excitation process, reduces excitation time, improves the stability of magnet;Enhance magnetic field stability, reduce magnetic field fluctuation;With the advantages such as high superconducting magnet cooling efficiency, low system energy consumption, reduce operating cost.

Description

Technical Field

[0001] This utility model relates to the field of superconducting magnet technology, and in particular to a superconducting magnet with stable excitation. Background Technology

[0002] Magnetic resonance imaging (MRI) systems rely on superconducting magnets to generate strong magnetic fields, and the stable operation of these magnets is crucial for image quality. Traditional excitation cooling methods suffer from low cooling efficiency and insufficient magnetic field stability, affecting image quality and system lifespan. Therefore, a more efficient cooling method and technology are needed to improve system performance.

[0003] Excitation refers to the process of energizing the magnets of a magnetic resonance device to generate a strong magnetic field.

[0004] Quenching refers to the phenomenon where a superconducting magnet suddenly loses its superconducting properties, causing the magnetic field to disappear rapidly and potentially releasing a large amount of energy and liquid helium.

[0005] Superconducting coils in magnetic resonance imaging (MRI) systems require cryogenic operation to ensure performance and stability. Traditional superconducting MRI systems suffer from limitations in magnetic field uniformity adjustment and high coupling between cryogenic cooling efficiency and magnetic field strength during excitation. Particularly during dynamic excitation, the amount of liquid helium evaporated varies drastically with magnetic field strength, increasing maintenance costs. Furthermore, existing cooling technologies are insufficient to meet the heat dissipation requirements of high-field-strength MRI equipment, potentially affecting long-term stable operation. Therefore, a new technological approach is needed to address these issues.

[0006] In the prior art, when a superconducting coil is energized, liquid nitrogen and liquid helium are first introduced into the superconducting magnet for pre-cooling, cooling the superconducting coil to a superconducting state below 4.2K to ensure that its resistance is zero; then, a current lead is inserted, and a high-stability current is slowly input through the excitation power supply, and the superconducting switch is used to control the circuit to close, forming a zero-loss closed-loop magnetic field.

[0007] During dynamic excitation, stronger magnetic field strength and higher temperature result in greater liquid helium evaporation. In existing technologies, the current loading rate during superconducting magnet excitation must be strictly limited, and the temperature of the superconducting wire must be rigorously controlled to prevent heat transfer to the superconducting wire during excitation, which could lead to quench loss. Excitation must be stopped when the superconducting wire temperature rises during excitation, and only resumed after the superconducting magnet temperature has decreased. This excitation method is time-consuming, labor-intensive, consumes a large amount of liquid helium, and is costly.

[0008] Therefore, designing a superconducting magnet with stable excitation has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0009] The technical problem this invention aims to solve is to provide a superconducting magnet with stable excitation, which can simultaneously cool the superconducting magnet with liquid helium during the excitation process, thereby reducing the excitation time and improving the stability of the magnet; enhancing the stability of the magnetic field and reducing magnetic field fluctuations; and having advantages such as high cooling efficiency of the superconducting magnet, low system energy consumption, and reduced operating costs.

[0010] To solve the above problems, the technical solution adopted by this utility model is as follows: A superconducting magnet with stable excitation includes a superconducting coil. The upper end of the superconducting coil is fixed with a first connecting seat and a second connecting seat, both of which are vertically arranged. The first connecting seat is adapted to the structure of the infusion tube of the superconducting magnet, and the second connecting seat is adapted to the structure of the current lead of the superconducting magnet.

[0011] As an improvement, the superconducting coil is provided with a liquid guide tube, which extends from the upper part of the superconducting coil to the bottom; the middle part of the first connecting seat is provided with a liquid delivery channel, and the lower part of the liquid delivery channel is connected to the upper end of the liquid guide tube.

[0012] As an improvement, the first connecting seat and the second connecting seat have the same structure, both including an infusion tube seat, a first electrode seat, a first insulating seat, a second electrode seat, and a second insulating seat that are fixedly connected from top to bottom.

[0013] As an improvement, both the first electrode holder and the second electrode holder are provided with cable holes.

[0014] As an improvement, the first connecting seat and the second connecting seat have the same structure and also include a fixing seat disposed below the second insulating seat; both the first connecting seat and the second connecting seat are fixedly mounted on the superconducting coil by the fixing seat.

[0015] As an improvement, the infusion tube seat, the first electrode seat, the first insulating seat, the second electrode seat, and the second insulating seat are all provided with through holes running vertically through the middle, and a blind hole is provided on the upper end face of the fixing seat, with the lower part of the blind hole connected to the upper end of the infusion tube.

[0016] As an improvement, it also includes a cryogenic container and a room temperature container that are sequentially nested from the inside out, with the superconducting coil located inside the cryogenic container; a service tower is provided on the room temperature container, and two spaced-apart neck tubes are provided inside the service tower; the upper end of the neck tube is fixed to the service tower and connected to the outside, and the lower end of the neck tube is fixed to the cryogenic container and connected to the cryogenic container; the positions of the first connecting seat and the second connecting seat correspond to the positions of the two neck tubes, and the first connecting seat and the second connecting seat are located below the inner side of the two neck tubes.

[0017] As an improvement, a cold shield is provided between the cryogenic container and the ambient temperature container, and the middle part of the neck tube is connected to the cold shield through a cold-conducting component.

[0018] The present invention adopts the above technical solution and has the following advantages compared with the prior art: This invention relates to a magnet with stable excitation. A first connecting seat and a second connecting seat with identical structures are fixed at the upper end of the superconducting coil. Combined with a double-necked tube design, this allows for simultaneous excitation and cooling of the superconducting magnet. The first and second connecting seats each correspond to a neck tube; one is used for liquid helium input, and the other for setting current leads. They are independent of each other and connected to the superconducting coil. During the magnet excitation process of the superconducting coil, liquid helium is simultaneously input to cool the superconducting magnet, thereby reducing excitation time and improving the stability and efficiency of the superconducting magnet. This enhances magnetic field stability and reduces magnetic field fluctuations. It also reduces system energy consumption and extends the service life of the superconducting magnet. Furthermore, it improves the cooling efficiency of the superconducting magnet, reducing system energy consumption and operating costs.

[0019] The first and second connectors have the same structure, both using a cylindrical design. The outer side carries the main excitation coil current, while the inner side is a cryogenic medium channel. Because the first and second connectors have the same structure, when one is inserted with a current lead, the other is inserted with an infusion tube. The first and second connectors can be used interchangeably, which is convenient and flexible.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a superconducting magnet with excitation stability according to the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of a superconducting coil Figure 1 ; Figure 3 for Figure 2 The left view; Figure 4 for Figure 1 Schematic diagram of the structure of a superconducting coil Figure 2 ; Figure 5 for Figure 2 A schematic diagram of the structure of the first connecting seat; Figure 6 for Figure 2 A three-dimensional schematic diagram of the first connecting seat in the middle; Wherein: 1-Superconducting coil, 2-First connecting seat, 3-Second connecting seat, 4-Infusion tube, 5-Current lead, 6-Infusion tube, 7-Infusion tube seat, 8-First electrode seat, 9-First insulating seat, 10-Second electrode seat, 11-Second insulating seat, 12-Infusion channel, 13-Cable hole, 14-Fixing seat, 15-Blind hole, 16-Cryogenic container, 17-Normal temperature container, 18-Service tower, 19-Neck tube, 20-Cold shield, 21-Corrugated pipe, 22-Cooling component. Detailed Implementation

[0022] Example

[0023] like Figures 1 to 6 As shown, a magnetized and stabilized superconducting magnet includes a superconducting coil 1, and a cryogenic container 16 and an ambient temperature container 17, which are sequentially arranged from the inside out. The superconducting coil 1 is disposed inside the cryogenic container 16. A service tower 18 is provided on the ambient temperature container 17, and a neck tube 19 is provided inside the service tower 18. The upper end of the neck tube 19 is fixed to the service tower 18 and communicates with the outside; the lower end of the neck tube 19 is fixed to the cryogenic container 16 and communicates with the cryogenic container 16. Figure 1 As shown, the neck tube 19 has a cylindrical structure. The neck tube 19 is a commonly used component in superconducting magnets, serving as a channel connecting the cryogenic container 16 of the superconducting magnet to the outside world. The neck tube 19 not only ensures the vacuum environment between the cryogenic container 16 and the ambient temperature container 17, but also allows the cryogenic container 16 to communicate with the outside world, facilitating the operation of the superconducting coil 1 by the operator.

[0024] A cold shield 20 is provided between the cryogenic container 16 and the ambient temperature container 17, and the middle part of the neck tube 19 is connected to the cold shield 20 through a cold-conducting component 22. In this embodiment, the cold-conducting component is preferably made of copper braid, which has good cold-conducting effect and a certain degree of flexibility, facilitating the connection between the neck tube 19 and the cold shield 20. One end of the copper braid is fixed to the neck tube 19, and the other end is fixed to the cold shield 20.

[0025] like Figures 1 to 6 As shown, the upper end of the superconducting coil 1 is fixed with a first connecting seat 2 and a second connecting seat 3, both of which are vertically arranged.

[0026] The number of neck tubes 19 can be one or two. When there is only one neck tube 19, both the first connecting seat 2 and the second connecting seat 3 are located below the inner side of the neck tube 19. In this embodiment, preferably, the service tower 18 is provided with two neck tubes 19 spaced apart, and the positions of the first connecting seat 2 and the second connecting seat 3 correspond to the positions of the two neck tubes 19, respectively, and the first connecting seat 2 and the second connecting seat 3 are located below the inner side of the two neck tubes 19.

[0027] Preferably, a corrugated pipe 21 is provided in the middle of the neck tube 19. The length of the corrugated pipe 21 can be extended and retracted, which can not only compensate for the extension and retraction of its own length caused by temperature changes, but also adapt to the installation distance between the low temperature container 16 and the normal temperature container 17, making installation convenient.

[0028] The first connector 2 is structurally compatible with the infusion tube 4 of the superconducting magnet. The second connector 3 is structurally compatible with the current lead 5 of the superconducting magnet. A liquid guide tube 6 is provided on the superconducting coil 1, extending from the upper part to the bottom of the superconducting coil 1. An infusion channel 12 is provided in the middle of the first connector 2, and the lower part of the infusion channel 12 is connected to the upper end of the liquid guide tube 6.

[0029] like Figures 1 to 6 As shown in the preferred embodiment, the first connecting seat 2 and the second connecting seat 3 have the same structure, each including an infusion tube seat 7, a first electrode seat 8, a first insulating seat 9, a second electrode seat 10, and a second insulating seat 11, which are fixedly connected from top to bottom, and also include a fixing seat 14 disposed below the second insulating seat 11. Both the first electrode seat 8 and the second electrode seat 10 are provided with cable holes 13 for connecting cables to the superconducting magnet. Both the first connecting seat 2 and the second connecting seat 3 are fixedly mounted on the superconducting coil 1 via the fixing seat 14. The infusion tube seat 7, the first electrode seat 8, the first insulating seat 9, the second electrode seat 10, and the second insulating seat 11 are each provided with through holes running vertically through their middle portions. A blind hole 15 is provided on the upper surface of the fixing seat 14, and the lower part of the blind hole 15 communicates with the upper end of the infusion tube 6.

[0030] When the superconducting magnet is cooled, the infusion tube 4 is inserted into the neck tube 19 from the upper end, and the lower end of the infusion tube 4 is extended straight onto the first connecting seat 2. At this time, liquid helium is supplied into the superconducting magnet through the infusion tube 4, and the liquid helium flows sequentially through the first connecting seat 2 and the liquid guide tube 6 to the bottom of the cryogenic container 16 of the superconducting magnet.

[0031] When the superconducting magnet is energized, the current lead 5 is inserted into the neck tube 19 from the upper end of the neck tube 19, and the positive and negative poles of the current lead 5 are respectively in contact with the first electrode seat 8 and the second electrode seat 10 of the second connecting seat 3, so that the superconducting coil 1 is electrically connected to the external power supply.

[0032] The first connecting seat 2 and the second connecting seat 3 have the same structure, both adopting a cylindrical structure. The outer side carries the main excitation coil current, and the inner side is a low-temperature medium channel. Since the first connecting seat 2 and the second connecting seat 3 have the same structure, when one is inserted with the current lead 5, the other is inserted with the infusion tube 4. The first connecting seat 2 and the second connecting seat 3 can be used interchangeably, which is convenient and flexible.

[0033] This invention relates to a magnetically stable superconducting magnet. A first connecting seat 2 and a second connecting seat 3 with identical structures are fixed to the upper end of the superconducting coil 1. Combined with the double-neck tube 19 structural design, this allows for simultaneous excitation and cooling of the superconducting magnet. The first connecting seat 2 and the second connecting seat 3 each correspond to a neck tube 19; one is used for liquid helium input, and the other for setting current leads. They are independent of each other and connected to the superconducting coil. During the magnet excitation process of the superconducting coil, liquid helium is simultaneously input into the superconducting magnet, i.e., simultaneous excitation and cooling of the superconducting magnet, to reduce excitation time and improve the stability and efficiency of the superconducting magnet. This enhances magnetic field stability and reduces magnetic field fluctuations. It also reduces system energy consumption and extends the service life of the superconducting magnet. Furthermore, it improves the cooling efficiency of the superconducting magnet, reducing system energy consumption and operating costs.

[0034] This invention relates to a superconducting magnet with stable excitation. During the excitation process, parameters such as current magnitude, coil temperature, and the flow rate and temperature of the cooling liquid are monitored in real time. Based on the monitoring data, the excitation current and liquid helium flow rate are adjusted. By continuously injecting liquid helium, the heat generated during the excitation of the superconducting coil is carried away and promptly transferred to the outside environment, achieving efficient cooling of the superconducting coil and ensuring that the superconducting magnet is always in optimal operating condition.

[0035] In summary, this invention provides a superconducting magnet with stable excitation. During the excitation process of the superconducting magnet, it can simultaneously cool the superconducting magnet with liquid helium, thereby reducing the excitation time and improving the stability of the magnet; enhancing magnetic field stability and reducing magnetic field fluctuations; and possessing advantages such as high superconducting magnet cooling efficiency, low system energy consumption, and reduced operating costs.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A magnet with stable excitation, comprising a superconducting coil (1), characterized in that: The upper end of the superconducting coil (1) is fixed with a first connecting seat (2) and a second connecting seat (3), both of which are vertically arranged; The first connector (2) is adapted to the structure of the infusion tube (4) of the superconducting magnet; the second connector (3) is adapted to the structure of the current lead (5) of the superconducting magnet.

2. The excitation-stabilized superconducting magnet as described in claim 1, characterized in that: The superconducting coil (1) is provided with a liquid guide tube (6), which extends from the upper part of the superconducting coil (1) to the bottom; the middle part of the first connecting seat (2) is provided with a liquid infusion channel (12), and the lower part of the liquid infusion channel (12) is connected to the upper end of the liquid guide tube (6).

3. The excitation-stabilized superconducting magnet as described in claim 2, characterized in that: The first connecting seat (2) and the second connecting seat (3) have the same structure, both including an infusion tube seat (7), a first electrode seat (8), a first insulating seat (9), a second electrode seat (10), and a second insulating seat (11) that are fixedly connected from top to bottom.

4. The excitation-stabilized superconducting magnet as described in claim 3, characterized in that: Both the first electrode holder (8) and the second electrode holder (10) are provided with cable holes (13).

5. The excitation-stabilized superconducting magnet as described in claim 3, characterized in that: The first connecting seat (2) and the second connecting seat (3) have the same structure and also include a fixing seat (14) disposed below the second insulating seat (11); the first connecting seat (2) and the second connecting seat (3) are both fixedly installed on the superconducting coil (1) by the fixing seat (14).

6. The excitation-stabilized superconducting magnet as described in claim 5, characterized in that: The infusion tube seat (7), the first electrode seat (8), the first insulating seat (9), the second electrode seat (10) and the second insulating seat (11) are all provided with through holes running vertically through the middle. A blind hole (15) is provided on the upper end surface of the fixed seat (14). The lower part of the blind hole (15) is connected to the upper end of the liquid guide tube (6).

7. The excitation-stabilized superconducting magnet according to any one of claims 1 to 6, characterized in that: It also includes a cryogenic container (16) and a room temperature container (17) that are sequentially assembled from the inside out. The superconducting coil (1) is set inside the cryogenic container (16). The room temperature container (17) is provided with a service tower (18), and the service tower (18) is provided with two spaced neck tubes (19). The upper end of the neck tube (19) is fixed on the service tower (18) and connected to the outside. The lower end of the neck tube (19) is fixed on the cryogenic container (16) and connected to the cryogenic container (16). The positions of the first connecting seat (2) and the second connecting seat (3) correspond to the positions of the two neck tubes (19), and the first connecting seat (2) and the second connecting seat (3) are located below the inner side of the two neck tubes (19).

8. The excitation-stabilized superconducting magnet as described in claim 7, characterized in that: A cold shield (20) is provided between the low-temperature container (16) and the normal-temperature container (17), and the middle part of the neck tube (19) is connected to the cold shield (20) through a cold-conducting component.

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