Superconducting magnet vacuum switching valve

Abstract

A superconducting magnet vacuum switching valve, a bottom portion of a valve body (1) being connected to one end of a dustproof cover (2), the other end of the dustproof cover (2) being connected to one end of a rapid positioning support (3), and the other end of the rapid positioning support (3) being connected to a handle (5); a piston rod (4) is provided in the rapid positioning support (3), and one end of the piston rod (4) penetrates through the dustproof cover (2) and is connected to a sealing piston (7); the sealing piston (7) is located in the valve body (1).

Description

A superconducting magnet vacuum switch valve Technical Field

[0001] The utility model relates to the technical field of superconducting magnet vacuum devices, in particular to a superconducting magnet vacuum switch valve. Background Art

[0002] The thermal insulation of the low-temperature zone of the superconducting magnet is achieved through the insulating container of the 4K outer layer, which refers to the high vacuum cavity between the magnet shell and the 4K. Its vacuum leakage rate must be less than 1x10-5mbar.l / s. Magnet exhaust and vacuum pumping are indispensable links. During operation, a valve device is used to connect the magnet exhaust port and the vacuum equipment.

[0003] However, the traditional gate valve combined with the reducer vacuum device has many disadvantages: 1. The components are cumbersome and heavy, and installation and removal require the cooperation of two people, which takes up manpower; 2. The exhaust efficiency is low and the working time is long; 3. After the vacuum exhaust is completed, the removal of the gate valve will destroy the sealing state of the magnet extraction port connection, and a small amount of air will enter the interior of the magnet, thereby affecting the high vacuum state of the magnet insulation container. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a superconducting magnet vacuum switch valve, which has stable sealing effect, high exhaust efficiency and can save more than 3 hours of operating time for each magnet.

[0005] To achieve the above-mentioned purpose, a superconducting magnet vacuum switch valve is designed, comprising a valve body and a dust cover, and is characterized in that: the bottom of the valve body is connected to one end of the dust cover, the other end of the dust cover is connected to one end of a quick positioning support, and the other end of the quick positioning support is connected to a handle; a piston rod is provided inside the quick positioning support, one end of the piston rod passes through the dust cover and is connected to a sealing piston; the sealing piston is located inside the valve body.

[0006] One end of the piston rod is connected to the sealing piston through a thread, the other end of the piston rod is connected to the handle, and the other end of the piston rod is locked by a locking nut.

[0007] The sealing piston is a boss structure, the upper outer edge of the sealing piston is sleeved with a sealing ring I, and the lower part of the sealing piston is embedded with a sealing ring II.

[0008] The outer edge of the piston rod is provided with a sealing sleeve, the top of the sealing sleeve is connected to the valve body through a plurality of screws, and the bottom of the sealing sleeve is connected to the pressure cover through a plurality of screws.

[0009] The top of the sealing sleeve and the valve body are sealed via a sealing ring III.

[0010] A guide copper sleeve is provided between the piston rod and the sealing sleeve, and the top of the guide copper sleeve is sealed by a plurality of sealing rings IV.

[0011] The sealing sleeve and the pressure cover are located inside the dust cover.

[0012] The dust cover is connected to the bottom of the valve body through a plurality of screws.

[0013] Compared with existing technologies, this utility model has the following advantages: 1. Low production cost, simple structure, convenient installation, and labor-saving operation, requiring only one person for installation and removal; 2. Stable sealing effect and high exhaust efficiency, saving more than three hours of work time per magnet; 3. No air enters the interior of the magnet during removal, which does not affect the high vacuum state of the magnet's insulation container; 4. High compatibility, it can be customized to suit the different diameters of the superconducting magnet's exhaust port or adapted using a reducer. Repeated experiments have verified that this utility model fully meets the application technical requirements of the superconducting magnet high vacuum field. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a front view of the structure of the present utility model.

[0015] FIG2 is a cross-sectional view of the structure of the present utility model.

[0016] FIG3 is a schematic diagram of the vacuum operation of the structure of the utility model connected to the vacuum port of the magnet.

[0017] FIG4 is a schematic diagram showing the completion of vacuuming by connecting the structure of the utility model to the magnetic vacuum port.

[0018] Referring to Figures 1 to 4, 1 is the valve body, 2 is the dust cover, 3 is the quick positioning support, 4 is the piston rod, 5 is the handle, 6 is the locking nut, 7 is the sealing piston, 8 is the sealing sleeve, 9 is the guide copper sleeve, 10 is the pressure cover, 11 is the sealing ring I, 12 is the sealing ring II, 13 is the sealing ring III, 14 is the sealing ring IV, 15 is the magnet exhaust port, 16 is the sealing gasket, and 17 is the locking caliper. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] As shown in Figure 1 and Figure 2, the bottom of the valve body 1 is connected to one end of the dust cover 2, the other end of the dust cover 2 is connected to one end of the quick positioning support 3, and the other end of the quick positioning support 3 is connected to the handle 5; a piston rod 4 is provided inside the quick positioning support 3, one end of the piston rod 4 passes through the dust cover 2 and is connected to the sealing piston 7; the sealing piston 7 is located inside the valve body 1.

[0021] One end of the piston rod 4 is connected to the sealing piston 7 through a thread, and the other end of the piston rod 4 is connected to the handle 5, and the other end of the piston rod 4 is locked by a locking nut 6.

[0022] The sealing piston 7 is a boss structure. A sealing ring I 11 is sleeved on the outer edge of the upper portion of the sealing piston 7 , and a sealing ring II 12 is embedded in the lower portion of the sealing piston 7 .

[0023] The outer edge of the piston rod 4 is provided with a sealing sleeve 8. The top of the sealing sleeve 8 is connected to the valve body 1 through a plurality of screws, and the bottom of the sealing sleeve 8 is connected to the pressure cover 10 through a plurality of screws.

[0024] The top of the sealing sleeve 8 and the valve body 1 are sealed by a sealing ring III 13 .

[0025] A guide copper sleeve 9 is provided between the piston rod 4 and the sealing sleeve 8, and the top of the guide copper sleeve 9 is sealed by a plurality of sealing rings IV14.

[0026] The sealing sleeve 8 and the pressure cover 10 are located inside the dust cover 2 .

[0027] The dust cover 2 is connected to the bottom of the valve body 1 through a plurality of screws.

[0028] The valve body 1 and the sealing sleeve 8 are sealed and connected by the sealing ring III13 and fastened by screws. The sealing sleeve 8 and the piston rod 4 are sealed and connected by the sealing ring IV14. The guide copper sleeve 9 is embedded in the sealing sleeve 8, and the guide copper sleeve 9 is fixed with the pressure cover 10 to provide a guiding and positioning function for the piston rod 4. The valve body 1 and the dust cover 2 are fixed by screws. The quick positioning support 3 is connected to the handle 5, and the handle 5 is connected to the piston rod 4 and fastened with a locking nut 6. The sealing piston 7 is provided with a sealing ring I11 and a sealing ring II12, and the piston rod 4 and the sealing piston 7 are connected by threads; the valve body 1 and the sealing sleeve 8 and the piston rod 4 are always in a sealed state through the sealing ring III13 and the sealing ring IV14.

[0029] The valve body 1, dust cover 2, quick positioning support 3, piston rod 4, handle 5, sealing piston 7, and gland 10 are all made of non-magnetic or low-magnetic SUS304 stainless steel.

[0030] The sealing sleeve 8 is made of 6061 alloy aluminum, which is beneficial to the static fit between the sealing sleeve 8 and the guide copper sleeve 9.

[0031] The guide copper sleeve 9 is made of QSn4-3, which has high wear resistance and elasticity, good anti-magnetism, can well withstand hot or cold working environments, and is more suitable for dynamic cooperation with the piston rod 4.

[0032] Sealing ring I11, sealing ring II12, sealing ring III13 and sealing ring IV14 are all made of fluororubber, which has excellent high temperature resistance, mechanical properties and aging resistance.

[0033] The utility model is assembled from parts and fixed by screws, which is convenient for later maintenance and repair.

[0034] The quick positioning support 3 is placed parallel to the piston rod 4 and supported on the end face of the dust cover 2, and the magnet vacuum exhaust work can be carried out. After completion, it is only necessary to lift the quick positioning support 3 and push the handle 5 to drive the sealing piston 7 to seal the superconducting magnet exhaust port, so that the magnet exhaust port is in a completely sealed state to ensure the high vacuum state of the magnet insulation container. Then, turn the handle 5 counterclockwise to separate the piston rod 4 from the sealing piston 7, and the device can be dismantled.

[0035] The valve body 1 and the sealing sleeve 8 are sealed and connected with the sealing ring III13 and fastened with screws; the sealing sleeve 8 and the piston rod 4 are sealed and connected with the sealing ring IV14 to ensure that the piston rod is sealed and can slide; the guide copper sleeve 9 is embedded in the sealing sleeve 8 and fixed with the pressure cover 10 to provide a guiding and positioning function for the piston rod 4; the valve body 1 and the dust cover 2 are fixed with screws to reduce the entry of dust into the sealing sleeve; the quick positioning support 3 is connected to the handle 5, and the handle 5 is connected to the piston rod 4 and fastened with nuts; the sealing piston 7 is provided with a sealing ring I11 and a sealing ring II12 to seal the magnet exhaust port; the piston rod 4 and the sealing piston 7 are connected by threads; this device uses the sealing ring III13 and the sealing ring IV14 to ensure that the valve body 1, the sealing sleeve 8 and the piston rod 4 are always in a sealed state.

[0036] As shown in FIG3 , when the magnet needs to be evacuated, the top of the valve body 1 is sealed with the magnet exhaust port 15 through the locking caliper 17 and the sealing gasket, and the air is evacuated from the inside of the magnet to the valve body 1 .

[0037] As shown in Figure 4, when the magnet is vacuumed, the piston rod 4 in the valve body 1 moves upward, so that the sealing piston 7 is sealed and connected to the magnet vacuum port 15. The piston rod 4 is separated from the sealing piston 7 by reversely rotating the thread, so that the inside of the magnet always maintains a vacuum state.

[0038] Compared to traditional magnet vacuum pumping devices, this new device offers the following advantages: 1. Low manufacturing cost, simple structure, easy installation, and labor savings, requiring only one person for installation and removal. 2. Stable sealing and high exhaust efficiency, saving over three hours of work time per magnet. 3. No air enters the magnet during removal, negatively impacting the high vacuum state of the magnet's thermally insulated container. 4. Highly compatible, it can be customized to suit the various calibers of superconducting magnet vacuum ports or adapted using a reducer. Repeated experiments have verified that this new device fully meets the technical requirements for high-vacuum applications in superconducting magnets.

Claims

1. A superconducting magnet vacuum switch valve, comprising a valve body and a dust cover, characterized in that: The bottom of the valve body (1) is connected to one end of the dust cover (2), the other end of the dust cover (2) is connected to one end of the quick positioning support (3), and the other end of the quick positioning support (3) is connected to the handle (5); a piston rod (4) is provided inside the quick positioning support (3), one end of the piston rod (4) passes through the dust cover (2) and is connected to the sealing piston (7); the sealing piston (7) is located inside the valve body (1).

2. A superconducting magnet vacuum switch valve according to claim 1, characterized in that: One end of the piston rod (4) is connected to the sealing piston (7) via a thread, the other end of the piston rod (4) is connected to the handle (5), and the other end of the piston rod (4) is locked via a locking nut (6).

3. A superconducting magnet vacuum switch valve according to claim 1 or 2, characterized in that: The sealing piston (7) is a boss structure, a sealing ring I (11) is sleeved on the upper outer edge of the sealing piston (7), and a sealing ring II (12) is embedded in the lower part of the sealing piston (7).

4. A superconducting magnet vacuum switch valve according to claim 1 or 2, characterized in that: The outer edge of the piston rod (4) is provided with a sealing sleeve (8), the top of the sealing sleeve (8) is connected to the valve body (1) via a plurality of screws, and the bottom of the sealing sleeve (8) is connected to the gland (10) via a plurality of screws.

5. A superconducting magnet vacuum switch valve according to claim 4, characterized in that: The top of the sealing sleeve (8) and the valve body (1) are sealed via a sealing ring III (13).

6. A superconducting magnet vacuum switch valve according to claim 4, characterized in that: A guide copper sleeve (9) is provided between the piston rod (4) and the sealing sleeve (8), and a plurality of sealing rings IV (14) are provided at the top of the guide copper sleeve (9) for sealing.

7. A superconducting magnet vacuum switch valve according to claim 4, characterized in that: The sealing sleeve (8) and the pressure cover (10) are located inside the dust cover (2).

8. The superconducting magnet vacuum switch valve according to claim 1, characterized in that: The dust cover (2) is connected to the bottom of the valve body (1) via a plurality of screws.

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