Multi-stage welding corrugated pipe damping device

Abstract

The utility model discloses a multistage welding corrugated pipe damping device which comprises a vibration cancellation part, an upper metal corrugated pipe pressure balancing part, a GM refrigerating machine part, a lower metal corrugated pipe pressure balancing part and a vacuum main cavity part, and the vibration cancellation part comprises an upper pulling plate, a rubber spring set and a lower pulling plate. The upper metal corrugated pipe balance pressure part comprises an upper vacuum blind plate, an upper damping metal corrugated pipe and a lower vacuum cover plate, and the GM refrigerator part comprises a GM refrigerator and a part to be refrigerated. The design structure of the upper-stage metal corrugated pipe, the lower-stage metal corrugated pipe and the rubber spring set is adopted, stress of the upper-stage metal corrugated pipe and stress of the lower-stage metal corrugated pipe are mutually balanced, the metal corrugated pipes are not subjected to vacuum pressure and are in a free telescopic state, then the rubber spring set is adjusted, the GM refrigerating machine is in a balanced state, and after the refrigerating machine is started, vibration can be consumed and decreased step by step; and the vibration reduction effect is remarkable.

Description

Technical Field

[0001] The present application relates to the field of low-temperature and strong magnetic field scientific experimental devices, and in particular to a multi-stage welded bellows shock absorbing device. Background Art

[0002] Since liquid helium is a non-renewable resource, expensive, and dependent on imports, liquid helium-free refrigerators are currently the main means of achieving liquid helium temperatures. Liquid helium-free refrigerators are simply divided into GM refrigerators and PT refrigerators. GM refrigerators are cheap, but have large vibrations, usually reaching more than 1-2μm. PT refrigerators have small vibrations, but are expensive, usually about 3-4 times that of GM refrigerators. Therefore, most scientific researchers will choose GM refrigerators, but for some experiments that are sensitive to vibration, GM refrigerators cannot meet the use requirements, such as CQDAFM, AFM, SPM, STM, etc.

[0003] There are two general solutions to the problem of large vibration of GM refrigerators: one is to fix the GM refrigerator on the ground, connect it to the main cavity through a metal bellows, and add helium as a cooling medium. However, this method has low cooling efficiency and the lowest temperature difference. The other is to add a rubber bellows at the connection between the GM refrigerator and the cavity. Pure helium passes through the inside of the bellows, but as the temperature drops, the internal helium will be liquefied into liquid helium. At the same time, due to the pressure difference, the rubber bellows will stick to the GM refrigerator, affecting the shock absorption effect. In addition, the life of the rubber bellows is relatively short, and replacement is relatively troublesome.

[0004] Since PT refrigerators are currently completely dependent on imports from Japan and the United States, the purchase price and after-sales service are relatively expensive. Solving the vibration reduction problem of GM refrigerators is of great significance. It can not only support the growth of domestic GM refrigerator manufacturers, but also solve the problem that scientific researchers cannot afford equipment. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, the present application provides a multi-stage welded bellows shock absorbing device.

[0006] The present application provides a multi-stage welded bellows shock absorbing device, which adopts the following technical solution:

[0007] A multi-stage welded bellows shock absorbing device comprises a vibration cancellation part, an upper metal bellows balance pressure part, a GM refrigerator part, a lower metal bellows balance pressure part and a vacuum main chamber part, wherein the vibration cancellation part comprises an upper pull plate, a rubber spring group and a lower pull plate, the upper metal bellows balance pressure part comprises an upper vacuum blind plate, an upper shock-absorbing metal bellows and a lower vacuum cover plate, the GM refrigerator part comprises a GM refrigerator and a part to be refrigerated, the lower metal bellows balance pressure part comprises a lower shock-absorbing metal bellows part, and the vacuum main chamber part comprises a vacuum chamber upper cover plate.

[0008] Optionally, the lower surface of the upper pull plate is fixedly connected to the upper surface of the rubber spring group via hexagon socket bolts, and the lower surface of the rubber spring group is fixedly connected to the upper surface of the lower pull plate via hexagon socket bolts.

[0009] Optionally, the vibration cancellation part also includes an upper support rod fixedly connected to the lower surface of the upper pull plate, the lower surface of the upper support rod is fixedly connected to the upper surface of the upper vacuum blind plate, and the lower surface of the lower pull plate is fixedly connected with an upper shock-absorbing support leg.

[0010] Optionally, the lower surface of the upper vacuum blind plate is fixedly connected to the upper surface of the upper shock-absorbing metal bellows by means of hexagon socket bolts, and the lower surface of the upper shock-absorbing metal bellows is fixedly connected to the upper surface of the lower vacuum cover plate by means of screws.

[0011] Optionally, the upper metal bellows balanced pressure part also includes a total support rod fixedly connected to the lower surface of the lower vacuum cover plate, the lower surface of the total support rod is fixedly connected to the vacuum chamber upper cover plate, the upper surface of the upper vacuum blind plate is fixedly connected to the vacuum hose interface A by argon arc welding, the upper metal bellows balanced pressure part also includes a vacuum hose interface B, a vacuum hose and a vacuum chamber, and the vacuum hose interface A and the vacuum hose interface B are connected together with the vacuum chamber through the vacuum hose.

[0012] Optionally, the GM refrigerator is fixed to the upper surface of the lower shock-absorbing metal corrugated member by screws, and the part to be refrigerated is connected to the GM refrigerator by a flexible connection.

[0013] Optionally, the lower surface of the lower shock-absorbing metal corrugated part is fixedly connected to the upper surface of the upper cover plate of the vacuum chamber by means of hexagon socket screws, the lower surface of the upper cover plate of the vacuum chamber is fixedly connected to the upper surface of the vacuum chamber by means of hexagon socket screws, and one side of the vacuum chamber is fixedly connected to a vacuum chamber outlet by means of argon arc welding.

[0014] In summary, the present application includes at least one of the following beneficial technical effects:

[0015] The utility model adopts a multi-stage metal bellows vibration reduction design, and uses a metal bellows as a transition between the refrigerator and the main cavity of the low-temperature thermostat, so that when the GM refrigerator is working, the upper and lower metal bellows are in a balanced state, reducing the influence of the vibration of the GM refrigerator on the main cavity of the low-temperature thermostat when it is working.

[0016] Through the combination of rubber spring groups, the metal bellows is in a normal elastic variation range close to the natural state, thereby absorbing the energy generated by absolute vibration. The vibration of the refrigerator, the upper and lower metal bellows and the main cavity of the low-temperature thermostat is gradually reduced. This design basically eliminates the influence of the vibration of the refrigerator on the main cavity of the low-temperature thermostat when it is working, and the vibration level is reduced to the level of hundreds of nanometers, which broadens the application scope of the device in the field of low temperature and low vibration, and significantly improves the product cost performance.

[0017] The utility model adopts a design structure of upper and lower two-stage metal bellows and a rubber spring group. The forces of the upper and lower metal bellows are balanced with each other, so that the metal bellows are not subject to vacuum pressure and are in a free expansion and contraction state. Then, by adjusting the rubber spring group, the GM refrigerator is in a balanced state. After the refrigerator is turned on, the vibration will be consumed and reduced step by step, ensuring a significant vibration reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a multi-stage welded bellows shock absorbing device proposed by the utility model;

[0019] Figure 2 The utility model is a multi-stage welded bellows shock absorbing device Figure 1 A magnified view of the structure at A;

[0020] Figure 3 The utility model is a multi-stage welded bellows shock absorbing device Figure 1 Enlarged view of the structure at B in the figure.

[0021] In the figure: 1. upper pull plate; 2. rubber spring group; 3. upper support rod; 4. lower pull plate; 5. vacuum hose; 6. vacuum hose interface A; 7. upper vacuum blind plate; 8. upper shock-absorbing metal bellows; 9. upper shock-absorbing support leg; 10. main support rod; 11. lower vacuum cover plate; 12. GM refrigerator; 13. lower shock-absorbing metal bellows; 14. upper cover plate of vacuum chamber; 15. vacuum chamber; 16. soft connection; 17. part to be refrigerated; 18. vacuum chamber extraction port; 19. vacuum hose interface B. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-3 This application is described in further detail.

[0023] Reference Figure 1-Figure 3A multi-stage welded bellows shock absorbing device includes a vibration cancellation part, an upper metal bellows balancing pressure part, a GM refrigerator part, a lower metal bellows balancing pressure part and a vacuum main chamber part. The vibration cancellation part includes an upper pull plate 1, a rubber spring group 2, and a lower pull plate 4. The upper metal bellows balancing pressure part includes an upper vacuum blind plate 7, an upper shock-absorbing metal bellows 8, and a lower vacuum cover plate 11. The GM refrigerator part includes a GM refrigerator 12 and a part to be refrigerated 17. The lower metal bellows balancing pressure part includes a lower shock-absorbing metal bellows part 13. The vacuum main chamber part includes a vacuum chamber upper cover plate 14.

[0024] The utility model adopts a multi-stage metal bellows vibration reduction design, and uses a metal bellows as a transition between the refrigerator and the main cavity of the low-temperature thermostat, so that when the GM refrigerator 12 is working, the upper and lower metal bellows are in a balanced state, reducing the influence of the vibration of the GM refrigerator 12 on the main cavity of the low-temperature thermostat when it is working.

[0025] The lower surface of the upper pull plate 1 is fixedly connected to the upper surface of the rubber spring group 2 by means of hexagon socket bolts, and the lower surface of the rubber spring group 2 is fixedly connected to the upper surface of the lower pull plate 4 by means of hexagon socket bolts. The rubber spring group 2 is usually a composite structure composed of rubber material and metal springs, and is used for shock absorption and stress buffering. It is designed to effectively absorb and disperse energy through the softness and elasticity of rubber when subjected to vibration or impact, thereby protecting other components of the system from damage or excessive pressure. The upper pull plate 1 and the lower pull plate 4 are connected to the rubber spring group 2 by means of hexagon socket bolts. This design helps to absorb and balance vibration and pressure in the system.

[0026] Through the combination of rubber spring group 2, the metal bellows is in a normal elastic variation range close to the natural state, thereby absorbing the energy generated by absolute vibration. The vibration of the refrigerator, the upper and lower metal bellows and the main cavity of the low-temperature thermostat is gradually reduced. This design basically eliminates the influence of the vibration of the refrigerator on the main cavity of the low-temperature thermostat when it is working, and the vibration level is reduced to the level of hundreds of nanometers, which broadens the application range of the device in the field of low temperature and low vibration, and significantly improves the product cost performance.

[0027] The vibration cancellation part also includes an upper support rod 3 fixedly connected to the lower surface of the upper pull plate 1, the lower surface of the upper support rod 3 is fixedly connected to the upper surface of the upper vacuum blind plate 7, and the lower surface of the lower pull plate 4 is fixedly connected with an upper shock-absorbing support leg 9, which supplements the components used for vibration cancellation in the system. The upper shock-absorbing support leg 9 is located on the lower surface of the lower pull plate 4. These support legs are used to support part of the system while helping to reduce the transmission of vibration to other parts of the system. These components work together on the system, and through fixing and supporting, they help to maintain the stability of the system and reduce vibration. This design takes into account the importance of vibration control during operation, especially during the operation of vacuum systems and GM refrigerators 12 and other equipment.

[0028] The lower surface of the upper vacuum blind plate 7 is fixedly connected to the upper surface of the upper shock-absorbing metal bellows 8 by means of hexagon socket bolts, and the lower surface of the upper shock-absorbing metal bellows 8 is fixedly connected to the upper surface of the lower vacuum cover plate 11 by means of screws. The connection between the upper vacuum blind plate 7 and the upper shock-absorbing metal bellows 8 is stable, while allowing disassembly and maintenance when necessary. The lower surface of the upper shock-absorbing metal bellows 8 is fixedly connected to the upper surface of the lower vacuum cover plate 11 by means of screws. This connection method ensures a tight connection between the upper shock-absorbing metal bellows 8 and the lower vacuum cover plate 11 by means of screws, which helps to transmit the shock-absorbing effect and maintain the structural integrity of the system.

[0029] The upper metal bellows pressure-balancing part also includes a total support rod 10 fixedly connected to the lower surface of the lower vacuum cover plate 11, the lower surface of the total support rod 10 is fixedly connected to the vacuum chamber upper cover plate 14, the upper surface of the upper vacuum blind plate 7 is fixedly connected to the vacuum hose interface A6 by argon arc welding, the upper metal bellows pressure-balancing part also includes a vacuum hose interface B19, a vacuum hose 5 and a vacuum chamber 15, the vacuum hose interface A6 and the vacuum hose interface B19 are connected to the vacuum chamber 15 through the vacuum hose 5, the total support rod 10 is an important structural component for supporting the entire system, the vacuum chamber upper cover plate 14 is used to seal and protect the vacuum chamber 15, the vacuum hose interface A6 and the vacuum hose interface B19 are used to transmit vacuum inside the system and ensure the tight connection and vacuum sealing between the various components.

[0030] The GM refrigerator 12 is fixed to the upper surface of the lower shock-absorbing metal bellows 13 by screws, and the part to be refrigerated 17 is connected to the GM refrigerator 12 by the soft connection 16. The GM refrigerator 12 is fixed to the upper surface of the lower shock-absorbing metal bellows 13 by screws. This method ensures a firm connection between the GM refrigerator 12 and the lower shock-absorbing metal bellows 13, and ensures the mechanical support required for the correct installation and operation of the cooling system. The soft connection 16 refers to a flexible pipe or hose, which is used to transfer the refrigerant medium or other necessary connection functions between the refrigerator and the part to be refrigerated 17. This method is usually used to provide flexible and reliable connections in complex refrigeration systems.

[0031] The lower surface of the lower shock-absorbing metal bellows 13 is fixedly connected to the upper surface of the vacuum chamber upper cover 14 by means of hexagon socket screws, the lower surface of the vacuum chamber upper cover 14 is fixedly connected to the upper surface of the vacuum chamber 15 by means of hexagon socket screws, one side of the vacuum chamber 15 is fixedly connected with a vacuum chamber body outlet 18 by means of argon arc welding, the lower surface of the lower shock-absorbing metal bellows 13 is fixedly connected to the upper surface of the vacuum chamber upper cover 14 by means of hexagon socket screws, ensuring a firm connection between the lower shock-absorbing metal bellows 13 and the vacuum chamber upper cover 14, such a component is usually used for shock absorption and supporting structure functions, the vacuum chamber body outlet 18 is used to connect the vacuum chamber 15 to other parts of the vacuum system for vacuum extraction, monitoring or other related operations.

[0032] The utility model adopts a design structure of an upper and lower two-stage metal bellows plus a rubber spring group 2. The forces of the upper and lower metal bellows are balanced with each other, so that the metal bellows are not subject to vacuum pressure and are in a free expansion and contraction state. Then, by adjusting the rubber spring group 2, the GM refrigerator 12 is in a balanced state. After the refrigerator is turned on, the vibration will be consumed and reduced step by step, ensuring a significant vibration reduction effect.

[0033] Working principle: In a specific embodiment of the utility model, when the device is working, first the vacuum chamber outlet 18 is connected to the external vacuum pump group to evacuate the vacuum chamber 15, the lower shock-absorbing metal bellows 13, and the upper shock-absorbing metal bellows 8.

[0034] After the vacuum reaches the specified value, the vacuum pump group is turned off. The size and material of the upper shock-absorbing metal bellows 8 and the lower shock-absorbing metal bellows 13 are exactly the same. At this time, the vacuum pressures of the upper shock-absorbing metal bellows 88 and the lower shock-absorbing metal bellows 1314 are the same and cancel each other out.

[0035] However, the weight of the GM refrigerator 12 cannot be balanced and there will still be vibration. At this time, the weight of the GM refrigerator 12 is balanced by adjusting the number and specifications of the rubber spring group 2, and then the GM refrigerator 12 is turned on. It will be found that the vibration is significantly smaller, and almost no vibration can be felt at the upper cover plate 14 of the vacuum chamber. Through professional vibration measuring instruments, it is found that the vibration level of the vacuum main chamber is reduced to hundreds of nanometers.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A multi-stage welded bellows shock absorbing device, characterized in that: The invention comprises a vibration cancellation part, an upper metal bellows balancing pressure part, a GM refrigerator part, a lower metal bellows balancing pressure part and a vacuum main chamber part. The vibration cancellation part comprises an upper pull plate (1), a rubber spring group (2) and a lower pull plate (4). The upper metal bellows balancing pressure part comprises an upper vacuum blind plate (7), an upper shock-absorbing metal bellows (8) and a lower vacuum cover plate (11). The GM refrigerator part comprises a GM refrigerator (12) and a part to be refrigerated (17). The lower metal bellows balancing pressure part comprises a lower shock-absorbing metal bellows part (13). The vacuum main chamber part comprises a vacuum chamber upper cover plate (14).

2. A multi-stage welded bellows shock absorbing device according to claim 1, characterized in that: The lower surface of the upper pull plate (1) is fixedly connected to the upper surface of the rubber spring group (2) via hexagon socket bolts, and the lower surface of the rubber spring group (2) is fixedly connected to the upper surface of the lower pull plate (4) via hexagon socket bolts.

3. A multi-stage welded bellows shock absorbing device according to claim 2, characterized in that: The vibration cancellation part also includes an upper support rod (3) fixedly connected to the lower surface of the upper pull plate (1), the lower surface of the upper support rod (3) is fixedly connected to the upper surface of the upper vacuum blind plate (7), and the lower surface of the lower pull plate (4) is fixedly connected to an upper shock-absorbing support leg (9).

4. A multi-stage welded bellows shock absorbing device according to claim 3, characterized in that: The lower surface of the upper vacuum blind plate (7) is fixedly connected to the upper surface of the upper shock-absorbing metal bellows (8) via hexagon socket bolts, and the lower surface of the upper shock-absorbing metal bellows (8) is fixedly connected to the upper surface of the lower vacuum cover plate (11) via screws.

5. A multi-stage welded bellows shock absorbing device according to claim 4, characterized in that: The upper metal bellows pressure balancing part also includes a total support rod (10) fixedly connected to the lower surface of the lower vacuum cover plate (11); the lower surface of the total support rod (10) is fixedly connected to the vacuum chamber upper cover plate (14); the upper surface of the upper vacuum blind plate (7) is fixedly connected to a vacuum hose interface A (6) by argon arc welding; the upper metal bellows pressure balancing part also includes a vacuum hose interface B (19), a vacuum hose (5) and a vacuum chamber (15); the vacuum hose interface A (6) and the vacuum hose interface B (19) are connected to the vacuum chamber (15) through the vacuum hose (5).

6. A multi-stage welded bellows shock absorbing device according to claim 5, characterized in that: The GM refrigerator (12) is fixed to the upper surface of the lower shock-absorbing metal corrugated member (13) by means of screws, and the part to be refrigerated (17) is connected to the GM refrigerator (12) by means of a flexible connection (16).

7. A multi-stage welded bellows shock absorbing device according to claim 6, characterized in that: The lower surface of the lower shock-absorbing metal corrugated member (13) is fixedly connected to the upper surface of the vacuum chamber upper cover plate (14) via hexagon socket screws, the lower surface of the vacuum chamber upper cover plate (14) is fixedly connected to the upper surface of the vacuum chamber (15) via hexagon socket screws, and one side of the vacuum chamber (15) is fixedly connected to a vacuum chamber body extraction port (18) via argon arc welding.

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