Superconducting magnetic resonance system and thermal leakage prevention current lead assembly thereof

Abstract

The utility model discloses a superconducting magnetic resonance system and a thermal leakage prevention current lead assembly thereof, a fixing plate is provided with an installation port, a fixing seat is installed on one side of the installation port, a female joint is installed in an installation groove of the fixing seat, and one end of the female joint passes through the installation port; a linear guide rod of the linear driving mechanism is located on the side, away from the fixing plate, of the fixing base and extends in the direction away from the female connector, the male connector is connected with the linear guide rail, and the linear driving mechanism drives the male connector to move through the linear guide rod to make electric contact with or be disconnected from the female connector. According to the heat leakage prevention current lead assembly with the optimized design, the male connector is electrically connected with the female connector in a pluggable mode through the linear driving mechanism, after magnet excitation is finished, the male connector can be driven by the linear driving mechanism to be separated from the female connector, contact between the male connector and the female connector is disconnected, conduction heat leakage is directly cut off, and the heat load is greatly reduced; and heat leakage of the current lead in the working process is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of superconducting magnetic resonance systems, in particular to a superconducting magnetic resonance system and a thermal current leakage prevention lead assembly thereof. Background Art

[0002] In a superconducting magnetic resonance system, the superconducting magnet needs to operate at low temperature, while the power supply for the magnet excitation is at room temperature. It is necessary to set a current lead as a conductor to connect the room temperature power supply and the low temperature magnet. Among them, the part between the 4K part and the cold shield is generally made of high-temperature superconducting tape, which has a low thermal conductivity and a relatively reasonable heat leakage control. The part between the cold shield and the vacuum container is usually a normal current lead, which is generally made of a good electrical conductor material to reduce the Joule heat generated during the excitation process. Good electrical conductors that meet low costs, such as metal materials, are also good thermal conductors. At the same time, since it is inside the vacuum container and cannot be disassembled after the excitation is completed, the primary heat leakage inside the magnet will increase through the heat conduction of the normal current lead, and ultimately affect the secondary cooling capacity of the refrigerator, thereby increasing the possibility that the magnet cannot work properly. Therefore, when the superconducting magnet system is in operation, the normal current lead is one of the main sources of heat leakage in the superconducting magnet system.

[0003] In particular, compared with traditional liquid helium superconducting magnets, liquid helium-free magnets do not have sufficient liquid helium reserves for cooling. When the cold head stops working unexpectedly, if the magnet leaks too much heat, the magnet temperature will rise quickly, leaving maintenance personnel with less time to restart the cold head, increasing the risk of magnet quenching. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model provides a superconducting magnetic resonance system and an anti-leakage thermal current lead assembly thereof.

[0005] The utility model provides a superconducting magnetic resonance system and a thermal current leakage prevention lead assembly thereof, comprising: a linear drive mechanism, a male connector, a female connector, a fixing seat and a fixing plate;

[0006] The fixing plate is provided with a mounting opening, the fixing seat is installed on one side of the mounting opening, the fixing seat is provided with a mounting groove corresponding to the mounting opening, the female connector is installed in the mounting groove and one end thereof passes through the mounting opening;

[0007] The linear drive mechanism includes a linear guide rod, which is located on the side of the fixed seat away from the fixed plate and extends away from the female connector. The male connector is connected to the linear guide rail. The linear drive mechanism drives the male connector to move through the linear guide rod to electrically contact or disconnect with the female connector.

[0008] Preferably, the female connector is provided with a contact concave surface, on which a first inclined portion is provided, and the male connector is provided with a contact convex surface, on which a second inclined portion matching the first inclined portion is provided.

[0009] Preferably, the first inclined surface portion has a tapered surface structure, and / or the second inclined surface portion has a tapered surface structure.

[0010] Preferably, an elastic ring is further provided in the installation groove, and the elastic ring is sleeved on the outside of the female joint.

[0011] Preferably, an elastic support member is provided at the bottom of the female connector.

[0012] Preferably, the linear drive mechanism further comprises a linear vacuum introducer, and the linear guide rod is connected to the linear vacuum introducer.

[0013] Preferably, it comprises two male connectors and two female connectors respectively matched with the two male connectors, the two male connectors are respectively connected to the linear guide rod through connecting pieces, and the two male connectors are respectively connected to external connectors.

[0014] In the utility model, the proposed anti-leakage thermal current lead assembly of the superconducting magnetic resonance system has an installation opening on the fixed plate, the fixed seat is installed on one side of the installation opening, the female connector is installed in the installation groove of the fixed seat and one end passes through the installation opening; the linear guide rod of the linear drive mechanism is located on the side of the fixed seat away from the fixed plate and extends in the direction away from the female connector, the male connector is connected to the linear guide rail, and the linear drive mechanism drives the male connector to move through the linear guide rod to electrically contact or disconnect with the female connector. Through the above-mentioned optimized design of the anti-leakage thermal current lead assembly, the male connector realizes a pluggable electrical connection with the female connector through the linear drive mechanism, and after the magnet excitation is completed, the male connector can be driven to detach from the female connector through the linear drive mechanism to disconnect the contact between the two, directly cutting off the conduction heat leakage, greatly reducing the heat load, and effectively avoiding the heat leakage of the current lead during operation.

[0015] The utility model also provides a superconducting magnetic resonance system, comprising: a vacuum container, a cold shield, a superconducting current component, a superconducting coil and the above-mentioned anti-leakage thermal current lead component;

[0016] The cold shield, male connector, female connector, fixing seat and fixing plate are located in the vacuum container, the superconducting current component and the superconducting coil are located in the cold shield, the fixing plate is installed on the cold shield, and the female connector is electrically connected to the superconducting coil through the superconducting current component.

[0017] In the utility model, the proposed superconducting magnetic resonance system has a technical effect similar to that of the above-mentioned anti-leakage thermal current lead assembly. Furthermore, the female connector is installed on the cold screen through a fixing plate to ensure the temperature environment of the female connector and further reduce the heat load. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of an implementation of an anti-leakage thermal current lead assembly of a superconducting magnetic resonance system proposed by the present invention.

[0019] Figure 2 The present invention is a schematic structural diagram of an implementation of a superconducting magnetic resonance system proposed by the present invention.

[0020] Figure 3 The present invention is a schematic structural diagram of an implementation of a thermal current leakage prevention lead assembly for a superconducting magnetic resonance system proposed by the present invention.

[0021] Figure 4 The present invention is a schematic structural diagram of another embodiment of a thermal current leakage prevention lead assembly for a superconducting magnetic resonance system. DETAILED DESCRIPTION

[0022] like Figures 1 to 4 As shown, Figure 1 This is a structural schematic diagram of an implementation of a superconducting magnetic resonance system and an anti-leakage thermal current lead assembly thereof proposed by the utility model. Figure 1 This is a three-dimensional structural schematic diagram of an implementation of an anti-leakage thermal current lead assembly of a superconducting magnetic resonance system proposed by the utility model. Figure 2 This is a structural schematic diagram of an implementation method of a superconducting magnetic resonance system proposed by the utility model. Figure 3 This is a structural schematic diagram of an implementation of an anti-leakage thermal current lead assembly for a superconducting magnetic resonance system proposed by the utility model. Figure 4 The present invention is a schematic structural diagram of another embodiment of a thermal current leakage prevention lead assembly for a superconducting magnetic resonance system.

[0023] Reference Figure 1 The utility model provides a superconducting magnetic resonance system anti-leakage thermal current lead assembly, comprising: a linear drive mechanism, a male connector 1, a female connector 2, a fixing seat 3 and a fixing plate 4;

[0024] The fixing plate 4 is provided with a mounting opening, the fixing seat 3 is installed on one side of the mounting opening, the fixing seat 3 is provided with a mounting groove corresponding to the mounting opening, the female connector 2 is installed in the mounting groove and one end thereof passes through the mounting opening;

[0025] The linear drive mechanism includes a linear guide rod 5, which is located on the side of the fixed seat 3 away from the fixed plate 4 and extends in a direction away from the female connector 2. The male connector 1 is connected to the linear guide rail. The linear drive mechanism drives the male connector 1 to move through the linear guide rod 5 to electrically contact or disconnect with the female connector 2.

[0026] In order to explain the specific working process of the anti-leakage thermal current lead assembly of this embodiment in detail, refer to Figure 2 , this embodiment also provides a superconducting magnetic resonance system, including: a vacuum container 10, a cold shield 20, a superconducting current component 30, a superconducting coil 40 and the above-mentioned anti-leakage thermal current lead component;

[0027] The cold shield 20, the male connector 1, the female connector 2, the fixing seat 3 and the fixing plate 4 are located in the vacuum container 10, the superconducting current component 30 and the superconducting coil 40 are located in the cold shield 20, the fixing plate 4 is installed on the cold shield 20, and the female connector 2 is electrically connected to the superconducting coil 40 through the superconducting current component 30.

[0028] During the operation of the superconducting magnetic resonance system of this embodiment, the anti-leakage heat current lead assembly is arranged between the cold shield and the vacuum container. When the magnet is excited, the linear drive mechanism pushes the male connector to cooperate with the female connector through the linear guide rail to form a current path for external current to be connected to the cold shield, and the current further powers the superconducting coil through the superconducting current assembly. After the magnet excitation is completed, the linear drive mechanism drives the male connector to retract through the linear guide rail and disconnect it from the female connector, cutting off the conduction heat leakage of the cold shield through the current path, greatly reducing the heat load.

[0029] In this embodiment, the proposed superconducting magnetic resonance system and its anti-leakage thermal current lead assembly have an installation opening on the fixed plate, the fixed seat is installed on one side of the installation opening, the female connector is installed in the installation groove of the fixed seat and one end passes through the installation opening; the linear guide rod of the linear drive mechanism is located on the side of the fixed seat away from the fixed plate and extends in the direction away from the female connector, the male connector is connected to the linear guide rail, and the linear drive mechanism drives the male connector to move through the linear guide rod to electrically contact or disconnect with the female connector. Through the above-mentioned optimized design of the anti-leakage thermal current lead assembly, the male connector realizes a pluggable electrical connection with the female connector through the linear drive mechanism, and after the magnet excitation is completed, the male connector can be driven to detach from the female connector through the linear drive mechanism to disconnect the contact between the two, directly cutting off the conduction heat leakage, greatly reducing the heat load, and effectively avoiding the heat leakage of the current lead during operation.

[0030] In a specific embodiment of the anti-leakage thermal current lead assembly, a contact concave surface is provided on the female connector 2, and a first inclined surface is provided on the contact concave surface, and a contact convex surface is provided on the male connector 1, and a second inclined surface is provided on the contact convex surface to cooperate with the first inclined surface. The male and female connectors amplify the contact pressure through the inclined surface cooperation, thereby greatly reducing the contact resistance and reducing the Joule heat of the excitation process. Furthermore, the first inclined surface has a conical surface structure, and / or the second inclined surface has a conical surface structure. The conical surfaces of the male and female connectors cooperate to further increase the contact area and ensure the stability of the magnet excitation process. In actual processing, the contact surfaces of the male and female connectors of the current lead have high processing accuracy, and the roughness is generally within Ra1.6μm, which can ensure better microscopic contact and smaller contact resistance.

[0031] During the installation process, it is difficult for the male and female connectors to achieve a high position accuracy, which results in a smaller contact area between the male and female connectors and a larger contact resistance. Therefore, in the specific design of the female connector, an elastic ring 6 is further provided in the installation groove, and the elastic ring 6 is sleeved on the outside of the female connector 2. The elastic ring allows the female connector to perform a small amount of horizontal displacement, so that the male and female connectors have good contact, further reducing the contact resistance.

[0032] Reference Figure 4 In other specific embodiments, an elastic support member 7 is provided at the bottom of the female connector 2. The elastic support member 7 can be a spring to ensure that excessive stress is not caused during thermal expansion, and also reduce the possibility of the connector being disconnected due to cold shrinkage, thereby improving the reliability of the electrical connection between the male and female connectors.

[0033] In the specific design of the linear drive mechanism, the linear drive mechanism also includes a linear vacuum introducer 8, and the linear guide rod 5 is connected to the linear vacuum introducer 8. The vacuum linear introducer is a mature vacuum motion component on the market, which can drive the internal guide rod structure to perform linear motion by controlling the external structure. The vacuum linear introducer should be able to meet the leakage rate requirements of the vacuum container.

[0034] Reference Figure 3 In actual design, at least two male connectors 1 and at least two female connectors 2 respectively matched with the at least two male connectors 1 may be included. The two male connectors 1 are respectively connected to the linear guide rod 5 through a connector, and the two male connectors 1 are respectively connected to an external connector 9. Male connectors with different electrical connection requirements can be designed according to the needs of use, and the linear guide rod can simultaneously drive multiple male connectors to contact and disengage with the female connector.

[0035] Superconducting current components may include components such as high-temperature superconducting wires, superconducting switches and superconducting wires.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A thermal current leakage prevention lead assembly for a superconducting magnetic resonance system, characterized in that: include: A linear drive mechanism, a male connector (1), a female connector (2), a fixing seat (3) and a fixing plate (4); The fixing plate (4) is provided with a mounting opening, the fixing seat (3) is installed on one side of the mounting opening, the fixing seat (3) is provided with a mounting groove corresponding to the mounting opening, and the female connector (2) is installed in the mounting groove with one end passing through the mounting opening; The linear drive mechanism comprises a linear guide rod (5), which is located on a side of the fixed seat (3) away from the fixed plate (4) and extends in a direction away from the female connector (2). The male connector (1) is connected to the linear guide rail. The linear drive mechanism drives the male connector (1) to move via the linear guide rod (5) so as to electrically contact or disconnect with the female connector (2).

2. The anti-leakage thermal current lead assembly of the superconducting magnetic resonance system according to claim 1, characterized in that: The female connector (2) is provided with a contact concave surface, on which a first inclined surface is provided, and the male connector (1) is provided with a contact convex surface, on which a second inclined surface matching the first inclined surface is provided.

3. The anti-leakage thermal current lead assembly of the superconducting magnetic resonance system according to claim 2, characterized in that: The first inclined surface portion has a tapered surface structure, and / or the second inclined surface portion has a tapered surface structure.

4. The anti-leakage thermal current lead assembly of the superconducting magnetic resonance system according to claim 1, characterized in that: An elastic ring (6) is also provided in the installation groove, and the elastic ring (6) is sleeved on the outside of the female connector (2).

5. The anti-leakage thermal current lead assembly of the superconducting magnetic resonance system according to claim 1, characterized in that: An elastic supporting piece (7) is provided at the bottom of the female joint (2).

6. The anti-leakage thermal current lead assembly of the superconducting magnetic resonance system according to claim 1, characterized in that: The linear drive mechanism also includes a linear vacuum introducer (8), and the linear guide rod (5) is connected to the linear vacuum introducer (8).

7. The anti-leakage thermal current lead assembly of the superconducting magnetic resonance system according to claim 1 or 6, characterized in that: The invention comprises two male connectors (1) and two female connectors (2) respectively matched with the two male connectors (1); the two male connectors (1) are respectively connected to a linear guide rod (5) via a connecting piece; and the two male connectors (1) are respectively connected to an external connector (9).

8. A superconducting magnetic resonance system, characterized in that: include: A vacuum container (10), a cold shield (20), a superconducting current component (30), a superconducting coil (40), and a leakage-proof thermal current lead component according to any one of claims 1 to 7; A cold shield (20), a male connector (1), a female connector (2), a fixing seat (3) and a fixing plate (4) are located in a vacuum container (10); a superconducting current component (30) and a superconducting coil (40) are located in the cold shield (20); the fixing plate (4) is mounted on the cold shield (20); and the female connector (2) is electrically connected to the superconducting coil (40) via the superconducting current component (30).

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