Low-temperature assembly of superconducting magnetic resonance magnet

Abstract

The utility model relates to the technical field of superconducting magnets, in particular to a low-temperature assembly of a superconducting magnetic resonance magnet, which comprises a coil framework and an outer cylinder mounted on the outer side of the coil framework, a low-temperature chamber is defined by the coil framework and the outer cylinder, an annular exhaust passage is arranged in the low-temperature chamber, and the upper end of the exhaust passage is communicated with the upper part of the low-temperature chamber; a heating piece is arranged on the lower portion of the exhaust channel. Two annular side plates arranged in a spaced mode are fixed to the inner wall of the outer cylinder, a connecting plate is connected between the two annular side plates, and the two annular side plates, the connecting plate and the outer cylinder define the exhaust channel. The heating sheet is located in the middle of the exhaust channel. According to the low-temperature assembly of the superconducting magnetic resonance magnet, the annular exhaust channel and the heating piece are arranged in the low-temperature assembly, micro-positive pressure in the low-temperature assembly can be maintained, helium bubbles formed when the heating piece works can be prevented from making contact with the superconducting coil in the rising process, and the low-temperature assembly has the advantages that the structure is simple, and the superconducting magnetic resonance magnet operates stably.

Description

Technical Field

[0001] The utility model relates to the technical field of superconducting magnets, in particular to a low-temperature component of a superconducting magnetic resonance magnet. Background Art

[0002] The superconducting wire used in the superconducting coil of the superconducting magnetic resonance magnet is made of niobium-titanium alloy. Niobium-titanium alloy will present a superconducting state with vanishing resistance at an extremely low critical temperature. In order to ensure that the niobium-titanium superconducting alloy can be stably in the superconducting state during the operation of the superconducting magnetic resonance magnet, the superconducting coil must be kept below the extremely low critical temperature. The commonly used method is to immerse it in liquid helium.

[0003] The superconducting magnetic resonance magnet includes a room temperature component and a cryogenic component mounted inside the room temperature component. The room temperature component is at room temperature, and the superconducting coil is inside the cryogenic component and immersed in liquid helium. The superconducting coil can generate a magnetic field when current is passed through it. There is a vacuum between the room temperature component and the cryogenic component, and the vacuum environment can keep the cryogenic component warm and reduce the heat conduction between the cryogenic component and the outside world. The temperature of liquid helium is 4.2K, which is minus 272℃. Under normal conditions, liquid helium will evaporate and turn from liquid to gas, or the liquid helium inside the cryogenic component will turn into gas after absorbing external heat. Therefore, the cryogenic component needs to be cooled by a refrigerator to maintain its low temperature state and refrigerate the gaseous liquid helium into liquid.

[0004] When the superconducting magnetic resonance magnet is in operation, the inside of its cryogenic component should maintain a slight positive pressure of about 2000 Pa. Because the temperature of liquid helium is extremely low, if negative pressure is formed in the cryogenic component and air is sucked in, it will freeze, affecting the cooling efficiency of the liquid helium on the superconducting coil and causing the risk of superconducting coil quenching.

[0005] As the refrigerator continues to cool, negative pressure will form inside the cryogenic component. In order to maintain the slight positive pressure inside the cryogenic component, a heater is placed in the liquid helium below the superconducting coil in the prior art. When the pressure inside the cryogenic component decreases, the heater is heated to convert a small amount of liquid helium into gaseous helium to maintain the slight positive pressure state inside the cryogenic component. When liquid helium turns into helium, bubbles will be generated. The temperature of the bubbles is relatively high. When the bubbles come into contact with the superconducting coil, the superconducting state of the superconducting coil will be destroyed, thereby causing the risk of superconducting magnetic resonance magnet quenching. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a low-temperature component of a superconducting magnetic resonance magnet in view of the above shortcomings. By arranging an annular exhaust channel and a heating plate inside the low-temperature component, a slight positive pressure inside the low-temperature component can be maintained, and helium bubbles formed when the heating plate is working can be prevented from contacting the superconducting coil during the rising process. The utility model has the advantages of simple structure and stable operation of the superconducting magnetic resonance magnet.

[0007] To solve the above problems, the technical solution adopted by the utility model is as follows:

[0008] A cryogenic component of a superconducting magnetic resonance magnet comprises a coil frame and an outer cylinder installed outside the coil frame, wherein the coil frame and the outer cylinder together form a cryogenic chamber, wherein an annular exhaust passage is arranged in the cryogenic chamber, wherein the upper end of the exhaust passage is connected to the upper part of the cryogenic chamber, and a heating plate is arranged at the lower part of the exhaust passage.

[0009] As an improvement, two annular side plates arranged at intervals are fixed on the inner wall of the outer cylinder, a connecting plate is connected between the two annular side plates, and the two annular side plates, the connecting plate and the outer cylinder together form the exhaust channel.

[0010] As an improvement, the heating plate is located in the middle of the lower end of the exhaust channel.

[0011] As an improvement, the heating plate is located on the inner wall of the outer cylinder.

[0012] As an improvement, a through hole is provided on the annular side plate of the exhaust passage, and the through hole is located at the lower part of the annular side plate; the lower part of the exhaust passage is connected with the lower part of the low-temperature chamber through the through hole.

[0013] As an improvement, the upper portion of the low temperature chamber is open.

[0014] As an improvement, a plurality of superconducting coils are provided on the coil frame.

[0015] The utility model adopts the above technical solution, and has the following advantages compared with the prior art:

[0016] The utility model discloses a cryogenic component of a superconducting magnetic resonance magnet. By arranging an annular exhaust channel and a heating plate inside the cryogenic component, a slight positive pressure inside the cryogenic component can be maintained, and helium bubbles formed when the heating plate is working can be prevented from contacting the superconducting coil during their rising process. The utility model has the advantages of simple structure, stable operation of the superconducting magnetic resonance magnet, etc.

[0017] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a cryogenic component of a superconducting magnetic resonance magnet of the utility model;

[0019] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0020] Among them: 1-coil skeleton, 2-outer cylinder, 3-low temperature chamber, 4-exhaust channel, 5-heating plate, 6-through hole, 7-annular side plate, 8-connecting plate, 9-superconducting coil. DETAILED DESCRIPTION

[0021] Example

[0022] like Figure 1 and Figure 2 As shown together, a cryogenic component of a superconducting magnetic resonance magnet includes a coil frame 1 and an outer cylinder 2 installed on the outside of the coil frame 1. The coil frame 1 and the outer cylinder 2 together form a cryogenic chamber 3. A plurality of superconducting coils 9 are arranged on the coil frame 1. In this embodiment, eight superconducting coils are taken as an example.

[0023] The low-temperature chamber 3 is provided with an annular exhaust passage 4 , the upper end of the exhaust passage 4 is connected with the upper part of the low-temperature chamber 3 ; the lower part of the exhaust passage 4 is provided with a heating plate 5 .

[0024] Two annular side plates 7 are fixed to the inner wall of the outer tube 2, and a connecting plate 8 is connected between the two annular side plates 7. The two annular side plates 7, the connecting plate 8 and the outer tube 2 together form the exhaust passage 4. In this embodiment, preferably, the heating plate 5 is located on the inner wall of the outer tube 2. The heating plate 5 is located in the middle of the lower end of the exhaust passage 4.

[0025] like Figure 1 and Figure 2 As shown together, the upper part of the low temperature chamber 3 is open. A through hole 6 is provided on the annular side plate 7 of the exhaust channel 4, and the through hole 6 is located at the lower part of the annular side plate 7; the lower part of the exhaust channel 4 is connected to the lower part of the low temperature chamber 3 through the through hole 6.

[0026] The superconducting magnetic resonance magnet is composed of a low-temperature component and a normal-temperature component, and the low-temperature component is suspended in the center of the normal-temperature component. When the superconducting magnetic resonance magnet is in use, the low-temperature chamber 3 of the low-temperature component contains liquid helium; a refrigerator is installed on the superconducting magnetic resonance magnet, and the refrigerator continuously cools the low-temperature component. The liquid helium inside the low-temperature chamber 3 can provide an extremely low temperature environment for the superconducting coil, ensuring that the superconducting coil can be in a superconducting state.

[0027] When the refrigerator continues to refrigerate, the gaseous helium in the low-temperature chamber 3 is converted into liquid helium, which will cause the pressure in the low-temperature chamber 3 to drop; in order to maintain a slight positive pressure in the low-temperature chamber 3 and not cause negative pressure, a heating plate 5 is set in the liquid helium. When the pressure in the low-temperature chamber 3 is lower than the set value, the heating plate is heated to convert the liquid helium into gaseous helium to maintain the slight positive pressure in the low-temperature chamber 3. The low-temperature component of the superconducting magnetic resonance magnet of the utility model is provided with an exhaust channel 4, and a heating plate 5 is provided at the lower part of the exhaust channel 4. When the heating plate 5 is heated, the surface liquid helium is gasified to produce helium bubbles, and the helium bubbles will rise to the upper part of the low-temperature chamber 3 along the exhaust channel 4, which can effectively prevent the helium bubbles from contacting the superconducting coil 9 during the rising process, and prevent the relatively high temperature helium bubbles from contacting the superconducting coil 9, causing the superconducting coil 9 to lose the superconducting state, and then causing the risk of superconducting magnetic resonance magnet quenching.

[0028] It is ensured that the helium bubbles in the low temperature chamber 3 do not contact the superconducting coil 9, so that the superconducting coil 9 can be stably in a superconducting state when working, thereby improving the stability of the quality of the superconducting magnetic resonance magnet.

[0029] In summary, the utility model provides a low-temperature component of a superconducting magnetic resonance magnet, which can maintain a slight positive pressure inside the low-temperature component and prevent helium bubbles formed when the heating plate is working from contacting the superconducting coil during their rising process by arranging an annular exhaust channel and a heating plate inside the low-temperature component. The utility model has the advantages of simple structure and stable operation of the superconducting magnetic resonance magnet.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cryogenic assembly of a superconducting magnetic resonance magnet, comprising a coil frame (1) and an outer cylinder (2) mounted outside the coil frame (1), characterized in that: The coil skeleton (1) and the outer cylinder (2) together form a low-temperature chamber (3), wherein an annular exhaust passage (4) is provided in the low-temperature chamber (3), wherein the upper end of the exhaust passage (4) is connected to the upper part of the low-temperature chamber (3); and a heating plate (5) is provided at the lower part of the exhaust passage (4).

2. The cryogenic assembly of a superconducting magnetic resonance magnet according to claim 1, characterized in that: Two annular side plates (7) are fixed to the inner wall of the outer cylinder (2) and are arranged at intervals. A connecting plate (8) is connected between the two annular side plates (7). The two annular side plates (7), the connecting plate (8) and the outer cylinder (2) together form the exhaust passage (4).

3. The cryogenic assembly of a superconducting magnetic resonance magnet according to claim 2, characterized in that: The heating plate (5) is located in the middle of the lower end of the exhaust channel (4).

4. The cryogenic assembly of a superconducting magnetic resonance magnet according to claim 3, characterized in that: The heating plate (5) is located on the inner wall of the outer cylinder (2).

5. The cryogenic assembly of a superconducting magnetic resonance magnet according to claim 2, characterized in that: A through hole (6) is provided on the annular side plate (7) of the exhaust channel (4), and the through hole (6) is located at the lower part of the annular side plate (7); the lower part of the exhaust channel (4) is connected to the lower part of the low-temperature chamber (3) through the through hole (6).

6. The cryogenic assembly of a superconducting magnetic resonance magnet according to claim 2, characterized in that: The upper part of the low-temperature chamber (3) is open.

7. The cryogenic assembly of a superconducting magnetic resonance magnet according to any one of claims 1 to 6, characterized in that: A plurality of superconducting coils (9) are provided on the coil frame (1).

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