Vacuum extraction opening protection device

Abstract

The utility model relates to the technical field of superconducting magnets, in particular to a vacuum extraction opening protection device which comprises a protection cover and a fixing assembly, the protection cover is of a cylindrical structure, an opening is formed in the upper end of the protection cover, and a protection cavity is formed in the inner side of the protection cover. A first through hole is formed in the lower end surface of the protective cover; a second through hole is formed in the side surface of the protective cover; a connecting part is arranged at the upper end of the protective cover and installed on the vacuum extraction opening through a fixing assembly. And a positioning ring is arranged on the connecting part. The fixing assembly comprises an upper connecting block and a lower connecting block, clamping blocks are arranged on the side portion of the upper connecting block and the side portion of the lower connecting block, and the connecting part is detachably fixed to the vacuum extraction opening through the upper connecting block, the lower connecting block and a fastener. According to the vacuum extraction opening protection device, the sealing plug at the vacuum extraction opening can be protected, the sealing plug cannot displace due to external force, the sealing plug has good sealing performance on the vacuum extraction opening, and then the stability of a superconducting magnet is guaranteed. The design has the advantages of simple structure, easiness in installation, convenience in operation and the like.

Description

Technical Field

[0001] This utility model relates to the field of superconducting magnet technology, and in particular to a vacuum evacuation port protection device. Background Technology

[0002] A superconducting coil consists of two coils, a primary coil and a secondary coil, both wound with superconducting wire. The gaps in the superconducting wire within the coil are filled with resin and cured to secure the wire. When the coil is energized, the superconducting wire enters a superconducting state at liquid helium temperature. Once in the superconducting state, the wire has no resistance and no current loss, and the coil generates a stable, strong magnetic field when energized.

[0003] Superconducting wires can only achieve superconductivity at a low temperature of 4K, but the temperature difference between room temperature and 4K is too large. Therefore, a superconducting magnet consists of three parts nested together from the inside out: a cryogenic layer, a cold shield layer, and a room temperature layer. The room temperature layer is the outermost layer, with a temperature consistent with room temperature, approximately 300K. Typically, the cold shield layer is designed for a temperature of 50K, and the cryogenic layer for a temperature of 4K. To reduce heat conduction between the layers, a vacuum chamber is placed between the room temperature layer and the cryogenic layer to minimize heat or cold transfer. Therefore, a vacuum evacuation port is usually installed below the room temperature layer of the superconducting magnet, and a dedicated molecular pump is used to evacuate the vacuum chamber. After evacuation, a piston is used to seal the vacuum evacuation port.

[0004] Once the vacuum chamber is evacuated, the vacuum state within it can maintain a temperature of 4K for the cryogenic layer and its interior. When the vacuum environment of the vacuum chamber is disrupted, a large amount of external heat enters the superconducting magnet, causing the ambient temperature of the cryogenic layer to rise. This causes the superconducting coil to lose its superconducting state, generating resistance and a large amount of heat, thus triggering quenching (the coil losing its superconducting state, or quenching for short). The liquid helium inside the magnet will be ejected through the quenching vent, the current will be completely consumed, and the superconducting magnet will lose its strong magnetic field, resulting in significant losses.

[0005] After the superconducting magnet is assembled, its vacuum chamber needs to be evacuated through a vacuum evacuation port. The port is then sealed with a plug, secured by atmospheric pressure to prevent disruption of the vacuum environment and maintain the required vacuum level. However, in certain situations, such as when the superconducting magnet loses its quench or during transport, bumps or impacts may occur, damaging or contaminating the vacuum evacuation port. This can lead to a loose seal, compromising the vacuum level and affecting the stability and safety of the superconducting magnet.

[0006] Therefore, designing a vacuum extraction port protection device has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] The technical problem this invention aims to solve is to address the above-mentioned shortcomings by providing a vacuum evacuation port protection device. This device effectively protects the sealing plug at the vacuum evacuation port from external forces, preventing displacement of the sealing plug and ensuring a good seal for the vacuum evacuation port, thereby guaranteeing the stability of the superconducting magnet. This design has advantages such as simple structure, easy installation, and convenient operation.

[0008] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0009] A vacuum extraction port protection device includes a cylindrical protective cover with an open top, the inner side of which forms a protective chamber; a first through hole is provided on the lower end face of the protective cover, and a second through hole is provided on the side of the protective cover; an annular connecting part is provided at the upper end of the protective cover, and the connecting part of the protective cover is detachably installed on the vacuum extraction port.

[0010] As an improvement, the number of the first through holes is multiple, and the multiple first through holes are arranged at intervals on the lower end face of the protective cover.

[0011] As an improvement, the number of second through holes is multiple, and the multiple second through holes are arranged at intervals on the side of the protective cover.

[0012] As an improvement, the connecting part is provided with an upwardly protruding annular positioning ring.

[0013] As an improvement, a C-shaped fixing component is also included. The fixing component includes an upper connecting block and a lower connecting block arranged vertically. Both the upper and lower connecting blocks have snap-fit ​​blocks on their sides. The connecting part at the upper end of the protective cover is detachably fixed to the vacuum extraction port by the upper connecting block, the lower connecting block and fasteners.

[0014] As an improvement, the lower side of the connecting part is provided with an annular fixing groove; the size of the fixing groove is adapted to the size of the snap-fit ​​block; in use, the snap-fit ​​block of the lower connecting block is placed in the fixing groove.

[0015] As an improvement, the number of fixing components is multiple, and the multiple fixing components are arranged at intervals.

[0016] The present invention adopts the above technical solution and has the following advantages compared with the prior art:

[0017] This vacuum evacuation port protection device effectively protects the sealing plug at the vacuum evacuation port from external forces. The sealing plug will not shift due to external forces, ensuring a good seal for the vacuum evacuation port and thus guaranteeing the stability of the superconducting magnet. This design has advantages such as simple structure, easy installation, and convenient operation.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the vacuum extraction port protection device in this utility model. Figure 1 ;

[0020] Figure 2 This is a three-dimensional schematic diagram of the vacuum extraction port protection device in this utility model. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the vacuum extraction port protection device in this utility model;

[0022] Figure 4 for Figure 3 Sectional view of AA;

[0023] Figure 5 for Figure 1 A three-dimensional schematic diagram of the protective shield;

[0024] Figure 6 for Figure 1 Schematic diagram of the structure of the protective shield;

[0025] Wherein: 1-protective cover, 2-first through hole, 3-second through hole, 4-protective chamber, 5-connecting part, 6-vacuum extraction port, 7-sealing plug, 8-positioning groove, 9-positioning ring, 10-fixing component, 11-upper connecting block, 12-lower connecting block, 13-clamping block, 14-fixing groove, 15-connecting flange. Detailed Implementation

[0026] Example

[0027] For ease of explanation rather than as a limitation, Figure 4 The direction of the left end of the vacuum extraction port protection device shown is defined as left, the direction of the right end is defined as right, and the directions derived therefrom are up and down.

[0028] like Figure 4 As shown, a sealing plug 7 is installed on the vacuum evacuation port 6 of the superconducting magnet. The end of the vacuum evacuation port 6 is provided with an annular connecting flange 15; a fixing groove 14 is provided on the upper end face of the connecting flange 15, and an annular positioning groove 8 is provided on the lower end face of the connecting flange 15.

[0029] like Figures 1 to 6As shown, a vacuum extraction port protection device includes a cylindrical protective cover 1 with an open top, and a protective chamber 4 formed inside the protective cover 1. A first through hole 2 is provided on the lower end face of the protective cover 1, and a second through hole 3 is provided on the side face of the protective cover 1. An annular connecting part 5 is provided at the upper end of the protective cover 1, and the connecting part 5 of the protective cover 1 is detachably mounted on the vacuum extraction port 6.

[0030] The number of first through holes 2 is multiple, and these multiple first through holes 2 are spaced apart on the lower end face of the protective cover 1. The number of second through holes 3 is multiple, and these multiple second through holes 3 are spaced apart on the side of the protective cover 1. Preferably, in this embodiment, the number of first through holes 2 is five, and the five first through holes 2 are arranged side by side. The number of second through holes 3 is three, and the three second through holes 3 are evenly distributed along the axial direction of the protective cover 1. The structural design of the first through holes 2 and the second through holes 3 facilitates observation of the state of the sealing plug 7 on the vacuum extraction port 6 and enables operations such as emergency quenching of the superconducting magnet.

[0031] The connecting part 5 is provided with an upwardly protruding annular positioning ring 9. When the vacuum port protection device is in use, the positioning ring 9 is located in the positioning groove 8. The positioning ring 9 can better connect the vacuum port protection device to the vacuum port 6, and facilitate the subsequent fixed connection between the vacuum port protection device and the vacuum port 6.

[0032] The vacuum extraction port protection device also includes a C-shaped fixing component 10. The fixing component 10 includes an upper connecting block 11 and a lower connecting block 12 arranged vertically. Both the upper connecting block 11 and the lower connecting block 12 have snap-fit ​​blocks 13 on their sides. The connecting part 5 at the upper end of the protective cover 1 is detachably fixed to the vacuum extraction port 6 via the upper connecting block 11, the lower connecting block 12, and fasteners. Multiple fixing components 10 are provided, spaced apart. An annular fixing groove 14 is provided on the lower side of the connecting part 5; the size of the fixing groove 14 matches the size of the snap-fit ​​block 13. In use, the snap-fit ​​block 13 of the lower connecting block 12 is placed within the fixing groove 14. Preferably, in this embodiment, three fixing components 10 are provided, evenly distributed.

[0033] The vacuum vent protection device is made of 316L stainless steel, which meets the cleanliness and low-temperature resistance requirements of medical equipment.

[0034] During use, the end of the sealing plug 7 installed on the vacuum extraction port 6 is located in the protective chamber 4 of the vacuum extraction port protection device.

[0035] When in use, after cleaning, the vacuum port protection device should be adjusted according to... Figures 1 to 4As shown in the diagram, the vacuum port protection device is placed on the vacuum port 6; the first through hole 2 and the second through hole 3 are adjusted to a suitable position so that the observer can observe the state of the sealing plug 7 and perform emergency quenching operations on the sealing plug 7. Then, multiple fixing components 10 are used to connect and lock the vacuum port protection device to the vacuum port 6.

[0036] In summary, this utility model provides a vacuum evacuation port protection device that effectively protects the sealing plug 7 at the vacuum evacuation port 6 from external forces. The sealing plug 7 will not shift due to external forces, and its excellent sealing performance ensures the stability of the superconducting magnet. This design has advantages such as simple structure, easy installation, and convenient operation. The vacuum evacuation port protection device ensures that the vacuum evacuation port 6 can still function normally under extreme conditions, maintaining the vacuum level of the vacuum chamber and reducing the risk of liquid helium evaporation and quenching failure in the superconducting magnet.

[0037] 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 vacuum extraction port protection device, characterized in that: The protective cover (1) includes a cylindrical structure with an opening at the top, and a protective chamber (4) is formed on the inner side of the protective cover (1); a first through hole (2) is provided on the lower end face of the protective cover (1), and a second through hole (3) is provided on the side of the protective cover (1). The upper end of the protective cover (1) is provided with a circular connecting part (5). The connecting part (5) of the protective cover (1) is detachably installed on the vacuum extraction port.

2. The vacuum air extraction port protection device of claim 1, wherein: The number of first through holes (2) is multiple, and multiple first through holes (2) are arranged at intervals on the lower end face of the protective cover (1).

3. The vacuum air extraction port protection device of claim 1, wherein: The number of the second through holes (3) is multiple, and the multiple second through holes (3) are arranged at intervals on the side of the protective cover (1).

4. The vacuum air extraction port protection device of claim 1, wherein: The connecting part (5) is provided with an upwardly protruding annular positioning ring (9).

5. A vacuum air extraction port protection device as claimed in any one of claims 1 to 4, characterised in that: It also includes a C-shaped fixing component (10), which includes an upper connecting block (11) and a lower connecting block (12) arranged vertically. Both the upper connecting block (11) and the lower connecting block (12) have snap-fit ​​blocks (13) on their sides. The connecting part (5) at the upper end of the protective cover (1) is detachably fixed to the vacuum extraction port by the upper connecting block (11), the lower connecting block (12) and fasteners.

6. The vacuum air extraction port protection device of claim 5, wherein: The lower side of the connecting part (5) is provided with an annular fixing groove (14); the size of the fixing groove (14) is adapted to the size of the snap-fit ​​block (13); in use, the snap-fit ​​block (13) of the lower connecting block (12) is placed in the fixing groove (14).

7. The vacuum air extraction port protection device of claim 5, wherein: The number of fixed components (10) is multiple, and the multiple fixed components (10) are arranged at intervals.

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