Balance adjustment structure and adjustment method of a vacuum cryogenic device

Abstract

The present invention relates to a balance adjustment structure and an adjustment method for a vacuum cryogenic device. The balance adjustment structure includes at least two adjustment mechanisms, and the adjustment mechanisms are installed on the outer side of an experimental device inside the vacuum cryogenic device. Each adjustment mechanism includes a low thermal conductivity rod, a heater assembly fixed at the end of the low thermal conductivity rod, and a detection module. The detection module is used to detect the inclination position of the experimental device. The heater assembly includes a heater and a getter. Based on the inclination position of the experimental device detected by the detection module, the balance adjustment structure controls the heater to heat the getter at the corresponding inclination position, so that the getter releases gas to reduce the weight at the corresponding inclination position, thereby adjusting the inclination state of the experimental device. The balance adjustment structure has a simple structure, no moving parts, simple operation, and can achieve high-precision balance adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum cryogenic experiments, and particularly to a balance adjustment structure and adjustment method for a vacuum cryogenic device. Background Art

[0002] In the technical field of vacuum cryogenic experiments, the balanced posture of the experimental device in the vacuum cryogenic device often has an important impact on the experimental results. In the prior art, the experimental device is usually adjusted as balanced as possible at room temperature to ensure balance at low temperature. However, due to different thermal contraction coefficients of materials and the existence of temperature gradients, the balanced state of the device at vacuum cryogenic temperature will inevitably change. Although these factors can be taken into account at room temperature to adjust the balance of the experimental device, there are still some factors that cause the experimental device to lose balance during the cooling process, such as some structures with negative stiffness coefficients. That is to say, the existing balance adjustment methods cannot meet the requirements of balancing the experimental device in a low-temperature vacuum state. Because in low-temperature environments such as liquid helium and liquid nitrogen temperatures, almost all materials are frozen hard, and even many materials become brittle, and many balance adjustment methods at room temperature become ineffective or cannot be used. For example, balance adjustment methods such as sliders and bolts at room temperature require complex actuating mechanisms at low temperature, which will bring problems such as heat leakage, noise, complex structure, and affecting the vacuum. Moreover, precise devices at vacuum cryogenic temperature cannot be operated intuitively, so the existing actuating mechanisms cannot meet the requirements of balancing the experimental device in a vacuum cryogenic environment. Summary of the Invention

[0003] The object of the present invention is to provide a balance adjustment structure and adjustment method for a vacuum cryogenic device. The balance adjustment structure has a simple structure and a simple balance adjustment method, and can perform high-precision balance adjustment on the experimental device in a vacuum cryogenic environment, solving the technical problem of difficult balance adjustment in a vacuum cryogenic environment.

[0004] The present invention provides a balance adjustment structure for a vacuum cryogenic device in one aspect. The balance adjustment structure includes at least two adjustment mechanisms. The adjustment mechanisms are installed outside the experimental device in the vacuum cryogenic device. Each adjustment mechanism includes a low thermal conductivity rod, a heater assembly fixed at the end of the low thermal conductivity rod, and a detection module. The detection module is used to detect the inclination position of the experimental device. The heater assembly includes a heater and a getter. The balance adjustment structure controls the heater to heat the getter at the corresponding inclination position based on the inclination position of the experimental device detected by the detection module, so that the getter releases gas to reduce the weight at the corresponding inclination position, thereby adjusting the inclination state of the experimental device, and thus realizing the balance adjustment of the experimental device.

[0005] In an embodiment of the present invention, the getter has a critical temperature. Below the critical temperature, the getter can absorb the working gas in the vacuum cryogenic device to ensure vacuum. Above the critical temperature, the getter can release the absorbed working gas to reduce weight, wherein the liquefaction temperature of the working gas and the critical temperature are both not lower than the operating temperature of the experimental device.

[0006] In an embodiment of the present invention, the getter is activated carbon.

[0007] In an embodiment of the present invention, the balance adjustment structure further includes a wrapping layer wrapped outside the heater assembly. There is a gap between the wrapping layer and the heater assembly, and the wrapping layer is provided with a plurality of openings for the working gas to enter and exit.

[0008] In an embodiment of the present invention, the wrapping layer is made of multiple layers of reflective materials.

[0009] In an embodiment of the present invention, the low thermal conductivity rod is made of polytetrafluoroethylene or G10.

[0010] In an embodiment of the present invention, the balance adjustment structure includes three of the adjustment mechanisms, and the three adjustment mechanisms are evenly distributed on the outside of the experimental device in a state where they are 120° to each other.

[0011] In an embodiment of the present invention, the detection module is an optical sensor or a capacitive sensor.

[0012] The present invention also provides a method for adjusting a balance adjustment structure of a vacuum cryogenic device in another aspect, including the steps of:

[0013] S1. The experimental device in the vacuum cryogenic device is cooled to the operating temperature, the working gas is inhaled from the cavity of the vacuum cryogenic device, and the detection module of the balance adjustment structure detects the inclination position of the experimental device; and

[0014] S2. Based on the inclination position of the experimental device detected by the detection module, control the heater to heat the getter at the corresponding inclination position, so that the getter releases gas to reduce the weight at the corresponding inclination position, thereby adjusting the inclination state of the experimental device.

[0015] In an embodiment of the present invention, the getter has a critical temperature, and the liquefaction temperature of the working gas and the critical temperature are both not lower than the working temperature of the experimental device. When the experimental device is cooled to the working temperature, the getter can absorb the working gas in the vacuum cryogenic device to ensure vacuum. When the getter is heated above the critical temperature, the getter releases the absorbed working gas to reduce the weight at the corresponding inclined position, thereby adjusting the inclined state of the experimental device.

[0016] The balance adjustment structure of the present invention adjusts the inclined state of the experimental device in the vacuum cryogenic device by controlling the heating of the getter to reduce the weight at the corresponding inclined position, thereby achieving high-precision balance adjustment of the experimental device. Moreover, the balance adjustment structure can ensure that the heat energy of the heater can be absorbed by the getter as much as possible by adopting a structure of a low-thermal-conductivity rod and a weakly heat-radiating wrapping layer, so as to weaken the influence of the heat of the heater on the experimental device in the vacuum cryogenic environment, and at the same time, weaken the cold radiation of the experimental device to the getter. In addition, the balance adjustment structure can achieve high-precision balance adjustment of the device in the vacuum cryogenic environment, has the advantages of no moving parts, simple structure, low cost, and convenient adjustment, does not interfere with the operation of the experimental device, and does not introduce noise.

[0017] Through the understanding of the subsequent description and the drawings, the further objects and advantages of the present invention will be fully reflected. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the balance adjustment structure according to a preferred embodiment of the present invention.

[0019] Figure 2 It is a schematic use diagram of the balance adjustment structure according to the above preferred embodiment of the present invention for balancing and adjusting the experimental device in the vacuum cryogenic device.

[0020] Explanation of the reference numerals in the drawings: Balance adjustment structure 10; Adjustment mechanism 11; Low-thermal-conductivity rod 111; Heater assembly 112; Heater 113; Getter 114; Wrapping layer 115; Vacuum cryogenic device 100; Vacuum chamber 110; Cavity 101; Room-temperature end cover 120; Experimental device 130; Suspension cable 140. Detailed Embodiments

[0021] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation schemes, deformation schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present invention.

[0022] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0023] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as limiting the quantity.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] As Figure 1 and Figure 2 shown, the specific structures of the vacuum cryogenic device 100 and its balance adjustment structure 10 according to a preferred embodiment of the present invention are illustrated.

[0026] As Figure 1 and Figure 2 shown, the balance adjustment structure 10 includes at least two adjustment mechanisms 11. The adjustment mechanisms 11 are installed outside the experimental device 130 inside the vacuum cryogenic device 100. Each of the adjustment mechanisms 11 includes a low thermal conductivity rod 111, a heater assembly 112 fixed at the end of the low thermal conductivity rod 111, and a detection module. The detection module is used to detect the tilt position of the experimental device 130. The heater assembly 112 includes a heater 113 and a getter 114. The balance adjustment structure 10 controls the heater 113 to heat the getter 114 at the corresponding tilt position based on the tilt position of the experimental device 130 detected by the detection module, so that the getter 114 releases gas to reduce the weight at the corresponding tilt position, thereby adjusting the tilt state of the experimental device 130, and thus realizing the balance adjustment of the experimental device.

[0027] Specifically, the getter 114 has a critical temperature T 0 . When the temperature is below the critical temperature T 0 , the getter 114 can absorb the working gas in the vacuum cryogenic device 100 to achieve a high vacuum degree in the cavity 101 of the vacuum cryogenic device 100. When the heater 113 heats the getter 114 above the critical temperature T 0 , the getter 114 can release the working gas to reduce the weight. Therefore, by controlling the heater 113 to heat the getter 114 at the corresponding inclined position, the balance position of the experimental device 130 can be adjusted with high precision. Through such an adjustment method, the balance adjustment structure 10 of the present invention has the advantages of no moving parts, simple structure, low cost, and convenient adjustment, does not interfere with the operation of the experimental device 130, does not introduce noise, and only needs to add heating leads and thermometer leads for the heater 113, and selects a low thermal conductivity alloy wire, such as phosphor bronze wire, and the increased heat leakage is small.

[0028] It is worth mentioning that both the liquefaction temperature and the critical temperature of the working gas are not lower than the operating temperature of the experimental device 130. Thus, when the experimental device 130 is cooled to the operating temperature and the working gas is inhaled into the cavity of the vacuum cryogenic device 100, the getter 114 inhales the working gas to ensure the vacuum degree of the vacuum cryogenic device 100, and when the detection module detects that the experimental device 130 is tilted in real time, the heater 113 is controlled in real time to heat the getter 114 to a temperature higher than the critical temperature T 0 , then the getter 114 can release the working gas to reduce the weight at the corresponding inclined position, thereby realizing the real-time adjustment of the posture of the experimental device 130.

[0029] In addition, it is also worth mentioning that the detection module can be an optical sensor arranged outside the vacuum cryogenic device 100, or a capacitive sensor arranged inside the vacuum chamber 110 of the vacuum cryogenic device 100, for real-time detecting the inclined position of the experimental device 130.

[0030] Specifically, in this preferred embodiment of the present invention, the getter 114 is activated carbon.

[0031] Furthermore, the balance adjustment structure 10 further includes a wrapping layer 115 that is spaced apart and wraps around the heater assembly 112. The wrapping layer 115 is provided with a plurality of openings for the working gas to enter and exit. When the vacuum cryogenic device 100 is in a vacuum state, the getter 114 can absorb the gas in the cavity 101 of the vacuum cryogenic device 100 through the plurality of openings to ensure the vacuum state. When the balance of the experimental device 130 needs to be adjusted, the gas released by heating the getter 114 can be discharged through the plurality of openings in the wrapping layer 115.

[0032] It is worth mentioning that the present invention does not limit the number and size of the openings provided in the wrapping layer 115.

[0033] Specifically, the wrapping layer 115 is a weak thermal radiation layer and can be made of a vacuum radiation reflection insulation material (such as an aluminized film with a high reflectivity). The function of the wrapping layer 115 being a weak thermal radiation layer is as follows: (1) ensuring that the heat of the heater 113 is absorbed by the getter 114 as much as possible; (2) weakening the influence of the heat of the heater 113 on the experimental device 130 and also weakening the radiative cooling of the experimental device 130 on the getter 114.

[0034] In this embodiment of the present invention, the wrapping layer 115 is connected to the low thermal conductivity rod 111, and the wrapping layer 115 forms a receiving cavity to accommodate the heater assembly 112 therein. The wrapping layer 115 is spaced and suspended above the getter 114 to avoid attaching to the getter 114 and affecting the operation of the getter 114. That is to say, there is a certain gap between the heater assembly 112 and the wrapping layer 115. It can be understood that in this embodiment of the present invention, the wrapping layer 115 is a spherical structure. In some embodiments of the present invention, the wrapping layer 115 can also be a structure with a cuboid shape, a polyhedron shape, etc. The present invention does not limit the shape and structure of the wrapping layer 115.

[0035] The low thermal conductivity rod 111 can be made of low thermal conductivity organic materials such as polytetrafluoroethylene or G10, where G10 is a composite material synthesized from fiberglass cloth and epoxy resin. The low thermal conductivity rod 111 has the same function as the wrapping layer 115 (i.e., the weak thermal radiation layer), which can ensure that the heat of the heater 113 is absorbed by the getter 114 as much as possible, weaken the influence of the heat of the heater 113 on the experimental device 130, and also weaken the cold radiation of the experimental device 130 to the getter 114. It can be understood that using a material with a low thermal conductivity for the low thermal conductivity rod 111 or making the low thermal conductivity rod 111 longer and thinner will further reduce the heat conduction of the low thermal conductivity rod 111. The longer the length of the low thermal conductivity rod 111, the greater the influence of the same weight change of the getter 114 on the balance of the experimental device 130 under the same conditions of the getter 114 and the heater 113.

[0036] As Figure 2 shown, the steps of specifically performing balance adjustment by the balance adjustment structure 10 in the vacuum cryogenic device 100 are schematically shown.

[0037] Specifically, the vacuum cryogenic device 100 includes a vacuum chamber 110, a room temperature end cover 120 covering the vacuum chamber 110, an experimental device 130 disposed in the vacuum chamber 110, and a sling 140 connecting the experimental device 130. The vacuum chamber 110 has the cavity 101, and the experimental device 130 is disposed in the cavity 101. In this embodiment of the present invention, the balance adjustment structure 10 includes three adjustment mechanisms 11, and the three adjustment mechanisms 11 are evenly distributed at 120° outside the experimental device 130 in the vacuum cryogenic device 100. Each adjustment mechanism 11 includes the low thermal conductivity rod 111, the heater assembly 112, and the wrapping layer 115.

[0038] More specifically, the specific steps for the balance adjustment structure 10 of the present application to adjust the balance of the experimental device 130 are as follows:

[0039] S1. The experimental device 130 in the vacuum cryogenic device 100 is cooled to the working temperature, and the working gas is inhaled from the cavity 101 of the vacuum cryogenic device 100. The detection module of the balance adjustment structure 10 detects the inclination position of the experimental device 130; and

[0040] S2. Based on the inclination position of the experimental device 130 detected by the detection module, the heater 113 is controlled to heat the getter 114 at the corresponding inclination position, so that the getter 114 releases the working gas and reduces the weight at the corresponding inclination position, thereby adjusting the inclination state of the experimental device 130.

[0041] That is to say, the working principle of the balance adjustment structure 10 of the application is as follows: The getter has a critical temperature, and the liquefaction temperature of the working gas and the critical temperature are both not lower than the working temperature of the experimental device. After the basic balance adjustment of the vacuum cryogenic device 100 at room temperature, the experimental device 130 is cooled to the working temperature step by step. When a certain amount of working gas is inhaled into the cavity 101, the getter 114 can absorb the working gas in the vacuum cryogenic device 100 to ensure vacuum. Further, the detection module detects and judges the tilt attitude and degree of the experimental device 130. Based on the tilt position of the experimental device 130 detected by the detection module, the heater 113 is controlled to heat the getter 114 at the corresponding tilt position to the critical temperature T 0 above, so that the getter 114 at the corresponding tilt position releases the working gas, reducing the weight at the corresponding tilt position, thereby changing the tilt state of the experimental device 130. Repeating this process can gradually achieve high-precision balance of the experimental device 130.

[0042] It can be understood that the getter 114 generally has a gas absorption capacity, and the adjustment limit will not exceed the gas absorption capacity of the getter 114. This balance adjustment method is a method to achieve high-precision balance, and is more suitable for devices that have achieved a certain level of balance.

[0043] Specifically, in this preferred embodiment of the present invention, the getter 114 uses cryogenic activated carbon, and the critical temperature T of the cryogenic activated carbon getter 0 ≈40K, and the experimental device 130 operates at 4K. Because the heat capacity of materials becomes very small at low temperatures, after the heater 113 works, the activated carbon has a fast response speed. The amount of gas released by the activated carbon can be controlled by controlling the voltage or current of the heater 113 and the continuous heating time, and the balance adjustment of the experimental device 130 can be achieved through repeated heating. That is to say, the present invention can achieve high-precision balance adjustment of the experimental device 130 by controlling the acceleration rate of the heater 113.

[0044] It can be understood that according to the amount of the heater 113, the heating rate is controlled within a reasonable range. On the one hand, it ensures the heating effect so that the getter 114 can release gas, and on the other hand, it makes the heat of the heater 113 not affect the experimental device 130 as much as possible.

[0045] It can also be understood that, in some embodiments of the present invention, the balance adjustment structure 10 may include two of the adjustment mechanisms 11. When the balance adjustment structure 10 includes two of the adjustment mechanisms 11, it is equivalent to adjusting the balance of the experimental device 130 by adjusting two of the three adjustment mechanisms. That is, the two adjustment mechanisms 11 are also arranged at 120° on the outside of the experimental device 130. Such an arrangement structure is applicable to the situation where space is limited and only two adjustment mechanisms can be arranged. That is to say, the present invention does not limit the number of the adjustment mechanisms 11.

[0046] Generally speaking, the balance adjustment structure 10 of the present invention adjusts the inclination state of the experimental device 130 in the vacuum cryogenic device 100 by controlling the heating getter 114 to reduce the weight at the corresponding inclined position, so as to achieve high-precision balance adjustment of the experimental device 130. Moreover, by adopting the structure of the low-thermal-conductivity rod 111 and the weakly thermally-radiating wrapping layer 115, the balance adjustment structure 10 can ensure that the heat energy of the heater 113 can be absorbed by the getter 114 as much as possible, so as to weaken the influence of the heat of the heater 113 on the experimental device 130 in the vacuum cryogenic environment, and at the same time, weaken the cold radiation of the experimental device 130 to the getter 114. In addition, the balance adjustment structure 10 can achieve high-precision balance adjustment of the device in the vacuum cryogenic environment, and has the advantages of no moving parts, simple structure, low cost, and convenient adjustment, without interfering with the operation of the experimental device 130 and without introducing noise.

[0047] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0048] The above embodiments only express the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A balance adjustment method for a vacuum cryogenic device, which is realized by using a balance adjustment structure. The balance adjustment structure includes at least two adjustment mechanisms. The adjustment mechanisms are installed outside the experimental device in the vacuum cryogenic device. Each adjustment mechanism includes a low thermal conductivity rod, a heater assembly fixed at the end of the low thermal conductivity rod, and a detection module. The detection module is used to detect the inclination position of the experimental device. The heater assembly includes a heater and a getter. The balance adjustment structure controls the heater to heat the getter at the corresponding inclination position based on the inclination position of the experimental device detected by the detection module, so that the getter releases gas to reduce the weight at the corresponding inclination position, thereby adjusting the inclination state of the experimental device; Characterized in that, It includes the steps of: S1. The experimental device in the vacuum cryogenic device is cooled to the working temperature, and the working gas is inhaled from the cavity of the vacuum cryogenic device. The detection module of the balance adjustment structure detects the inclination position of the experimental device; and S2. Based on the inclination position of the experimental device detected by the detection module, control the heater to heat the getter at the corresponding inclination position, so that the getter releases gas to reduce the weight at the corresponding inclination position, thereby adjusting the inclination state of the experimental device.

2. The method according to claim 1, Characterized in that, The getter has a critical temperature. The liquefaction temperature of the working gas and the critical temperature are both not lower than the working temperature of the experimental device. When the experimental device is cooled to the working temperature, the getter can absorb the working gas in the vacuum cryogenic device to ensure vacuum. When the getter is heated above the critical temperature, the getter releases the absorbed working gas to reduce the weight at the corresponding inclination position, thereby adjusting the inclination state of the experimental device.

3. The method according to claim 1, Characterized in that, The getter has a critical temperature. Below the critical temperature, the getter can absorb the working gas in the vacuum cryogenic device to ensure vacuum. Above the critical temperature, the getter can release the absorbed working gas to reduce the weight, wherein the liquefaction temperature of the working gas and the critical temperature are both not lower than the working temperature of the experimental device.

4. The method according to claim 3, Characterized in that, The getter is activated carbon.

5. The method according to claim 3 or 4, Characterized in that, The balance adjustment structure further includes a wrapping layer wrapped outside the heater assembly. There is a gap between the wrapping layer and the heater assembly. The wrapping layer is provided with a plurality of openings for the working gas to enter and exit.

6. The method according to claim 5, Characterized in that, The wrapping layer is made of vacuum radiation reflection adiabatic material.

7. The method according to claim 6, Characterized in that, The low thermal conductivity rod is made of polytetrafluoroethylene or G10.

8. The method according to claim 6, Characterized in that, The balance adjustment structure includes three of the adjustment mechanisms, and the three adjustment mechanisms are evenly installed on the outside of the experimental device in a state where they are mutually 120°.

9. According to the method described in claim 6, characterized in that the detection module is an optical sensor or a capacitive sensor.

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