A low-vibration, liquid nitrogen-free high-temperature superconducting interferometer component

Abstract

The present invention provides a low-vibration, liquid nitrogen-free, high-temperature superconducting interferometer assembly, comprising: an upper frame for mounting a refrigerator compressor; a lower frame for mounting a high-temperature superconducting interferometer; and a middle frame for mounting the refrigerator's hoses, cold fingers, and cold chain. The cold chain transports the cold energy generated by the refrigerator to the high-temperature superconducting interferometer, with the upper, middle, and lower frames connected sequentially from top to bottom. Vibration isolation pads are provided at at least one end of the fixed rods in the upper and middle frames. At least two interferometer cold shields are mounted within the lower frame, one of which is mounted on the outside of the high-temperature superconducting interferometer, and the remaining interferometer cold shields are sequentially mounted on the outside of corresponding interferometer cold shields. The present invention achieves high integration and uninterrupted operation of the overall assembly, while effectively isolating the effects of vibrations of the refrigerator compressor and cold fingers on the detection performance of the high-temperature superconducting interferometer.

Description

Technical Field

[0001] The present application relates to the technical field of low-temperature refrigeration equipment, in particular to the technical field of superconducting low-temperature measurement, and specifically to a low-vibration, liquid nitrogen-free, high-temperature superconducting interferometer component. Background Art

[0002] Currently, the low-temperature working environment of a high-temperature superconducting quantum interference device (HTSQUID) is provided by liquid nitrogen, which produces a large amount of loss during operation. After the liquid nitrogen is exhausted, the interferometer cannot work, that is, the component cannot work continuously for a long time. At the same time, the vacuum of the Dewar of a HTSQUID with this structure requires regular maintenance, which increases the cost of using the components.

[0003] Based on this, industry technicians have combined refrigerators with high-temperature superconducting quantum interference devices (HTSQUIDs). While refrigerators can ensure long-term, uninterrupted operation of HTSQUIDs, they inevitably vibrate during operation. Specifically, after integrating the SQUID with the refrigerator, the vibration of the refrigerator's cold fingers introduces errors in the interferometer's measurement direction, causing additional noise and reducing the interferometer's sensitivity, thus affecting measurement accuracy. Furthermore, the existing SQUID component structure and size are relatively large, limiting its portability and application scenarios. Summary of the Invention

[0004] The present invention provides a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer component to solve the problem that the existing high-temperature superconducting interferometer component cannot work for a long time in a low-temperature working environment, and greatly reduces the vibration problem caused by the introduction of a refrigerator.

[0005] In order to solve at least one of the above-mentioned problems existing in the prior art, an embodiment of the present application provides a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer component.

[0006] According to an embodiment of the present application, the present application provides a low-vibration, liquid nitrogen-free, high-temperature superconducting interferometer assembly, comprising: a refrigerator and a high-temperature superconducting interferometer. Further, the assembly also includes:

[0007] An upper frame for mounting a compressor of the refrigerator;

[0008] A lower frame, used for installing the high-temperature superconducting interferometer;

[0009] The middle frame is used to install the hose, cold finger and cold chain of the refrigerator; wherein the cold chain is used to transport the cold energy generated by the refrigerator to the high-temperature superconducting interferometer, and the upper frame, the middle frame and the lower frame are connected in sequence from top to bottom; at least one end of the fixing rods in the upper frame and the middle frame is provided with a vibration isolation pad;

[0010] A cold finger mounting plate is provided inside the middle frame, and the cold finger mounting plate is connected to the bottom of the middle frame via a cold finger mounting plate support rod, and at least one end of the cold finger mounting plate support rod is provided with a vibration isolation pad; the cold finger passes through the cold finger mounting plate and transmits the cooling energy to the high-temperature superconducting interferometer through the cold chain;

[0011] At least two interferometer cold screens are arranged inside the lower frame, one of which is sleeved outside the high-temperature superconducting interferometer, and the remaining interferometer cold screens are sequentially sleeved outside the corresponding interferometer cold screens; and

[0012] A bellows is provided between the cold finger mounting plate and the bottom of the middle frame and is sleeved on the outside of the cold chain to form a vacuum space with the cold finger mounting plate, the bottom of the middle frame and the lower frame, and to reduce the vibration of the cold finger to the vacuum space.

[0013] In some embodiments of the present application, a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly further includes:

[0014] The compressor mounting plate is used to mount the compressor to the upper support plate of the upper frame, and a vibration isolation pad is provided between the compressor mounting plate and the upper support plate of the upper frame.

[0015] In some embodiments of the present application, the hose passes through the lower support plate of the upper frame; and

[0016] The compressor is connected to the cold finger through the hose.

[0017] In some embodiments of the present application, the cold chain includes a flexible cold chain and a detachable columnar cold chain;

[0018] One end of the flexible cold chain is connected to the cold finger, and the other end is connected to one end of the detachable columnar cold chain. The other end of the detachable columnar cold chain is connected to the high-temperature superconducting interferometer.

[0019] In some embodiments of the present application, a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly further includes:

[0020] a cold platform, provided at the junction of the flexible cold chain and the detachable columnar cold chain in the lower frame;

[0021] The cold platform support rod is arranged between the bottom of the middle frame and the cold platform, and is used to support the cold platform.

[0022] In some embodiments of the present application, a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly further includes:

[0023] The cold chain cold screen is arranged between the cold finger mounting plate and the cold platform, and is sleeved on the outside of the cold finger and the outside of the flexible cold chain.

[0024] In some embodiments of the present application, a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly further includes:

[0025] The interferometer mounting platform is arranged at the bottom of the detachable columnar cold chain and is used for mounting at least one high-temperature superconducting interferometer and an interferometer cold shield sleeved on the outside of the high-temperature superconducting interferometer.

[0026] In some embodiments of the present application, the remaining interferometer cold screens are sequentially mounted on the outside of the corresponding interferometer cold screens through the cold platform.

[0027] In some embodiments of the present application, the bellows is located inside the cold finger mounting plate support rod relative to the middle frame.

[0028] In some embodiments of the present application, the outer diameter of the bellows and its flange is smaller than the diameter of the support rod of the cold finger mounting plate.

[0029] From the above description, it can be seen that an embodiment of the present invention provides a low-vibration, liquid nitrogen-free, high-temperature superconducting interferometer assembly, including: a refrigerator and a high-temperature superconducting interferometer, an upper frame for installing the compressor of the refrigerator; a lower frame for installing the high-temperature superconducting interferometer; a middle frame for installing the hose, cold finger and cold chain of the refrigerator; wherein the cold chain is used to transport the cold energy generated by the refrigerator to the high-temperature superconducting interferometer, and the upper frame, the middle frame and the lower frame are connected in sequence from top to bottom; at least one end of the fixed rods in the upper frame and the middle frame is provided with a shock-isolating pad; a cold finger mounting plate is provided inside the middle frame, and the cold finger mounting plate is connected to the cold finger through the cold finger mounting plate The plate support rod is connected to the bottom of the middle frame, and at least one of the two ends of the cold finger mounting plate support rod is provided with a shock isolation pad; the cold finger passes through the cold finger mounting plate and transmits the cold energy to the high-temperature superconducting interferometer through the cold chain; at least two interferometer cold screens are arranged inside the lower frame, one of which is mounted on the outside of the high-temperature superconducting interferometer, and the remaining interferometer cold screens are sequentially mounted on the outside of the corresponding interferometer cold screens; and a bellows is provided between the cold finger mounting plate and the bottom of the middle frame, and is mounted on the outside of the cold chain, which is used to form a vacuum space with the cold finger mounting plate, the bottom of the middle frame and the lower frame, and to reduce the vibration of the cold finger to the vacuum space.

[0030] The present invention provides a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer component, which is integrated with a refrigerator to achieve high integration and uninterrupted operation of the entire component. In addition, the vibration isolation structure design can effectively isolate the influence of the refrigerator compressor and refrigerator cold finger vibration on the detection performance of the high-temperature superconducting interferometer, thereby achieving continuous high-performance detection of the high-temperature superconducting interferometer component. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0032] Figure 1 This is a schematic cross-sectional structural diagram of a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly according to an embodiment of the present application (the cross section is located on the side).

[0033] Figure 2 Schematic diagram of the shape of the vacuum space in an embodiment of the present application.

[0034] Figure 3 This is a schematic diagram of the appearance of a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer component according to a specific application example of this application.

[0035] Figure 4 For the specific application examples of this application Figure 1 Schematic diagram of the enlarged structure of part B.

[0036] Figure 5 This is a schematic diagram of the cross-sectional structure of the dismantling of a detachable columnar cold chain component in a specific application example of this application.

[0037] Reference numerals:

[0038] 1: Upper support plate of upper frame I; 2: Vibration isolation pad (matched with compressor mounting plate 3); 3: Compressor mounting plate; 4: Fixing rod of upper frame I; 4-1: Vibration isolation pad (matched with fixing rod 4); 5: Compressor; 6: Hose; 7: Lower support plate of upper frame I; 8: Vibration isolation pad (matched with fixing rod 9 of middle frame II); 9: Fixing rod of middle frame II; 10: Cold finger; 11: Cold finger mounting plate; 12: Vibration isolation pad (matched with cold finger mounting plate support rod 13) ); 13: Cold finger mounting plate support rod; 14: Bellows; 15: Bottom of frame II (lower support plate of middle frame II); 16: Vibration isolation pad (matched with cold platform support rod 19); 17: Cold chain cold shield; 18: Flexible cold chain; 19: Cold platform support rod; 20: Cold platform; 21: Secondary cold shield; 22: Removable columnar cold chain; 23: Interferometer mounting platform; 24: High-temperature superconducting interferometer; 25: Primary cold shield; 26: Lower frame III housing; and

[0039] I: upper frame; II: middle frame; III: lower frame; IV: vacuum space. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices. The embodiments in this application and the features described in the embodiments may be combined with each other unless there is a conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0042] The superconducting quantum interference device (SQID) is a magnetically sensitive element. It is a core component in equipment in fields such as weak magnetic measurement, mineral exploration, and medical medicine, and must operate in a low-temperature environment. With the development of materials science and material preparation technology, the operating temperature of the SQID has been increased from 4.2K to 77K, which greatly reduces the demand for a low-temperature working environment during the operation of the SQID. In the existing technology, the above-mentioned low-temperature environment can be provided in two ways: the first is to use a refrigerant, by transporting liquid nitrogen to the vicinity of the interferometer to directly cool the interferometer; the second is to use a refrigerator, which is directly integrated with the interferometer.

[0043] Patent publication number CN112731513B provides a cryostat vibration damping structure; patent publication number CN115711359A provides a zero-evaporation liquid nitrogen storage tank suitable for pure germanium detection. In both patents, the detector is immersed in liquid nitrogen. To minimize liquid nitrogen loss, a cryostat is used to cool the liquid nitrogen container, enabling extended continuous component operation. However, liquid nitrogen will still be lost during use, and the cryostat cold head is placed in a vacuum environment, requiring a strict maintenance of the large-scale vacuum environment.

[0044] Patent publication number CN117824237A provides a liquid helium Dewar micro-perturbation zero-volatile cooling system, which immerses a superconducting quantum interferometer in liquid helium and uses a refrigerator to cool the liquid helium to achieve a closed cycle. Although the system spatially isolates the interferometer from the refrigerator, it only has vibration isolation design between the refrigerator cold finger and the mounting plate. The interferometer is not designed for vibration isolation, and environmental vibrations will still be transmitted to the interferometer, thereby affecting detection.

[0045] Patent publication number CN105571190B provides a mechanical vibration-isolated, liquid helium-free, cryogenic refrigeration system; patent publication number CN109654786B provides a low-vibration cooling device using a closed-cycle refrigerator; and patent publication number CN112963498B provides a 10nm-class, liquid helium-free, cryogenic vibration reduction system. All of these patents combine an externally circulating liquid helium system with a cryogenic refrigerator to achieve cryogenic temperatures. While vibration reduction is primarily focused on the refrigerator and system level, little attention is paid to vibration reduction designs for core components.

[0046] Patent publication number CN111089436A provides a low-vibration, low-temperature magnetic field measurement device based on GM refrigerator cooling. It uses a closed liquid helium cycle in a vacuum chamber combined with a deep-cryogenic refrigerator for cooling. The effect of the refrigerator on the vibration of the sample holder is reduced through spatial separation. However, the sample holder itself lacks vibration isolation measures.

[0047] Based on this, and in order to solve at least one of the above-mentioned problems existing in the prior art, an embodiment of the present application provides a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer component. Figure 1 This is a schematic diagram of a low-vibration, liquid nitrogen-free, high-temperature superconducting interferometer assembly according to an embodiment of the present application. Figure 1 As shown, a low-vibration liquid nitrogen-free high-temperature superconducting interferometer assembly comprises:

[0048] Refrigerator and high-temperature superconducting interferometer 24;

[0049] Upper frame I( Figure 1 (shown in the red dotted box), for installing the compressor 5 of the refrigerator;

[0050] Lower Frame III( Figure 1 (shown in the blue dotted box), used to install the high-temperature superconducting interferometer 24;

[0051] Middle Frame II( Figure 1 (as shown in the green dotted box in the middle), a hose 6, a cold finger 10 and a cold chain (including a flexible cold chain 18 and a detachable columnar cold chain 22) for installing a refrigerator; wherein the cold chain is used to transport the cold energy generated by the refrigerator to the high-temperature superconducting interferometer 24, and the upper frame I, the middle frame II and the lower frame III are connected in sequence from top to bottom; at least one end of the fixing rods (4, 9) in the upper frame I and the middle frame II is provided with a vibration isolation pad;

[0052] Preferably, the number of fixing rods 4 of the upper frame I is 4-8, preferably 4, and the preferred material is non-magnetic austenitic stainless steel or aluminum alloy. The number of fixing rods 9 of the middle frame II is 4-8, preferably 4, and the preferred material is polyester glass fiber reinforced material.

[0053] A cold finger mounting plate 11 is provided inside the middle frame II. The cold finger mounting plate 11 is connected to the bottom 15 of the middle frame II via a cold finger mounting plate support rod 13. At least one end of the cold finger mounting plate support rod 13 is provided with a vibration isolation pad. The cold finger 10 passes through the cold finger mounting plate 11 and transmits the cooling energy to the high-temperature superconducting interferometer 24 through the cold chain.

[0054] Preferably, the number of the cold finger mounting plate support rods 13 is 4-8, preferably 4, and the preferred material is polyester glass fiber reinforced material.

[0055] At least two interferometer cold shields ( Figure 1 There are two interferometer cold screens, a primary cold screen 25 and a secondary cold screen 21), which are arranged inside the lower frame III. One of the interferometer cold screens 25 (i.e., the primary cold screen 25) is sleeved outside the high-temperature superconducting interferometer 24, and the remaining interferometer cold screens are sequentially sleeved outside the corresponding interferometer cold screens ( Figure 1 The secondary cold screen 21 is set outside the primary cold screen 25); and

[0056] A bellows 14 is provided between the cold finger mounting plate 11 and the bottom 15 of the middle frame II and is sleeved on the outside of the cold chain ( Figure 1 This is a cross-sectional view of the side of a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly. Therefore, in the top view, the bellows 14 is a ring) and is used to be airtightly connected to the cold finger mounting plate 11, the bottom 15 of the middle frame, and the lower frame III to form a vacuum space IV (such as Figure 1 As shown in the purple dotted box, it should be pointed out that for the sake of easy distinction and clarity of the drawing, a small gap is reserved between the purple dotted box and the adjacent wall. However, in fact, the vacuum space is bounded by the wall. In addition, the overall shape of the purple dotted box can be seen in Figure 2 ,), and reducing the vibration of the cold finger 10 with respect to the vacuum space IV.

[0057] Continue to see Figure 1 In some embodiments of the present application, a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly further includes:

[0058] The compressor mounting plate 3 is used to mount the compressor 5 to the upper support plate 1 of the upper frame 1. Vibration isolation pads 2 are disposed between the compressor mounting plate 3 and the upper support plate 1 of the upper frame 1. The compressor mounting plate 3 is thus mounted to the upper support plate 1 of the upper frame 1 via the vibration isolation pads 2. Furthermore, the number of vibration isolation pads 2 is 4-8, preferably 4, evenly distributed on the compressor mounting plate 3. The preferred material for the vibration isolation pads 2 is silicone.

[0059] Furthermore, only the upper end of the fixing rod 4 is connected to the upper support plate 1 through the vibration isolation pad 4 - 1 , that is, the number of the vibration isolation pads 4 - 1 is the same as that of the fixing rod 4 , preferably four.

[0060] Vibration isolation pads 8 are installed at both ends of the fixing rod 9 of the middle frame II, that is, the number of vibration isolation pads 8 is twice the number of the fixing rods 9, and the material of the vibration isolation pads 8 is preferably butadiene rubber (BR).

[0061] Vibration isolation pads 12 are respectively installed at both ends of the cold finger mounting plate support rod 13, that is, the number of vibration isolation pads 12 is twice the number of cold finger mounting plate support rods 13. The material of the vibration isolation pads 12 is preferably butadiene rubber (BR).

[0062] Continue to see Figure 1 In some embodiments of the present application, the hose 6 passes through the lower support plate 7 of the upper frame 1; and the compressor 5 is connected to the cold finger 10 through the hose 6. That is, a through hole is provided in the lower support plate 7 of the upper frame 1 for the hose 6 to pass through.

[0063] Continue to see Figure 1 In some embodiments of the present application, the cold chain includes a flexible cold chain 18 and a detachable columnar cold chain 22; the material of the flexible cold chain 18 is preferably oxygen-free copper or high-purity aluminum.

[0064] One end of the flexible cold chain 18 is connected to the cold finger 10 , and the other end is connected to one end of the detachable columnar cold chain 22 . The other end of the detachable columnar cold chain 22 is connected to the high-temperature superconducting interferometer 24 .

[0065] Continue to see Figure 1 In some embodiments of the present application, a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly further includes:

[0066] A cold platform 20 is provided at the junction of the flexible cold chain 18 and the detachable columnar cold chain 22 in the lower frame III;

[0067] The cold platform support rods 19 are provided between the bottom 15 of the middle frame II (ie, the lower support plate of the middle frame II) and the cold platform 20 to support the cold platform 20 .

[0068] Furthermore, a vibration isolation pad 16 is provided between the cold platform support rod 19 and the bottom 15 of the middle frame II, and the material of the vibration isolation pad 16 is silicone.

[0069] Continue to see Figure 1 In some embodiments of the present application, a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly further includes:

[0070] The cold chain shield 17 is disposed between the cold finger mounting plate 11 and the cold platform 20, and is sleeved outside the cold fingers 10 and the flexible cold chain 18. That is, the flexible cold chain 18 is installed within the cold chain shield 17, with both ends of the flexible cold chain 18 connected to the cold fingers 10 and the cold platform 20, respectively.

[0071] It is understandable that the above-mentioned arrangement of the cold chain cooling shield 17 requires that a through hole be provided at the bottom 15 of the middle frame II, and the outer diameter of the cold chain cooling shield 17 is smaller than the radius of the through hole.

[0072] Continue to see Figure 1 In some embodiments of the present application, a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer assembly further includes:

[0073] The interferometer mounting platform 23 is provided at the bottom of the detachable columnar cold chain 22 and is used to install at least one high-temperature superconducting interferometer 24 and an interferometer cold shield 25 (i.e., a primary cold shield 25) sleeved on the outside of the high-temperature superconducting interferometer 24.

[0074] On the basis of the above embodiment, the remaining interferometer cold screens are sequentially mounted on the outside of the corresponding interferometer cold screens through the cold platform (in order of Figure 1 For example, the number of interferometer cold screens is two, and the secondary cold screen 21 is set outside the primary cold screen 25).

[0075] Specifically, the secondary cold shield 21 is mounted on the periphery of the cold platform 20, enclosing the detachable columnar cold chain 22 and the components mounted thereon. The detachable columnar cold chain 22 can be removed according to usage conditions, and the interferometer mounting platform 23, which holds the high-temperature superconducting interferometer 24 and the primary cold shield 25, can be directly mounted on the cold platform 20.

[0076] Continue to see Figure 1 In some embodiments of the present application, the bellows 14 is located inside the cold finger mounting plate support rod 13 relative to the middle frame II.

[0077] In some embodiments of the present application, the outer diameter of the bellows 14 and its flange is smaller than the diameter (installation size diameter) of the cold finger mounting plate support rod 13. The upper and lower ends of the bellows 14 are respectively connected to the cold finger mounting plate 11 and the bottom 15 of the middle frame II.

[0078] From the above description, it can be seen that an embodiment of the present invention provides a low-vibration, liquid nitrogen-free, high-temperature superconducting interferometer assembly, including: a refrigerator and a high-temperature superconducting interferometer, an upper frame for installing the compressor of the refrigerator; a lower frame for installing the high-temperature superconducting interferometer; a middle frame for installing the hose, cold finger and cold chain of the refrigerator; wherein the cold chain is used to transport the cold energy generated by the refrigerator to the high-temperature superconducting interferometer, and the upper frame, the middle frame and the lower frame are connected in sequence from top to bottom; at least one end of the fixed rods in the upper frame and the middle frame is provided with a shock-isolating pad; a cold finger mounting plate is provided inside the middle frame, and the cold finger mounting plate is connected to the cold finger through the cold finger mounting plate The plate support rod is connected to the bottom of the middle frame, and at least one of the two ends of the cold finger mounting plate support rod is provided with a shock isolation pad; the cold finger passes through the cold finger mounting plate and transmits the cold energy to the high-temperature superconducting interferometer through the cold chain; at least two interferometer cold screens are arranged inside the lower frame, one of which is mounted on the outside of the high-temperature superconducting interferometer, and the remaining interferometer cold screens are sequentially mounted on the outside of the corresponding interferometer cold screens; and a bellows is provided between the cold finger mounting plate and the bottom of the middle frame, and is mounted on the outside of the cold chain, which is used to form a vacuum space with the cold finger mounting plate, the bottom of the middle frame and the lower frame, and to reduce the vibration of the cold finger to the vacuum space.

[0079] The low-vibration, liquid nitrogen-free high-temperature superconducting interferometer component provided by the present invention firstly does not require liquid nitrogen during operation. A refrigerator provides cooling for the high-temperature superconducting interferometer, thereby enabling long-term uninterrupted operation of the interferometer. In addition, the component has a smaller size and is more applicable. Finally, the component achieves low vibration of the component through a mechanical vibration isolation structure, thereby realizing high-sensitivity detection of the interferometer.

[0080] To further illustrate the solution, the present invention also provides a specific application example of a low-vibration, liquid nitrogen-free high-temperature superconducting interferometer component.

[0081] like Figure 1 as well as Figure 3As shown, a low-vibration liquid nitrogen-free high-temperature superconducting interferometer assembly includes: an upper support plate 1 of an upper frame I, a vibration isolation pad 2 (matched with a compressor mounting plate 3), a compressor mounting plate 3, a fixing rod 4 of the upper frame I, a vibration isolation pad 4-1 (matched with the fixing rod 4), a compressor 5, a hose 6, a lower support plate 7 of the upper frame I, a vibration isolation pad 8 (matched with a fixing rod 9 of a middle frame II), a fixing rod 9 of a middle frame II, a cold finger 10, a cold finger mounting plate 11, and a vibration isolation pad 12. (matching with the cold finger mounting plate support rod 13), cold finger mounting plate support rod 13, bellows 14, bottom 15 of middle frame II (lower support plate of middle frame II), vibration isolation pad 16 (matching with cold platform support rod 19), cold chain cold shield 17, flexible cold chain 18, cold platform support rod 19, cold platform 20, secondary cold shield 21, detachable columnar cold chain 22, interferometer mounting platform 23, high temperature superconducting interferometer 24, primary cold shield 25 and lower frame III housing 26. Specifically:

[0082] The upper support plate 1 serves as the mounting base for the low-vibration, liquid nitrogen-free, high-temperature superconducting interferometer assembly. It requires a high Young's modulus material, preferably austenitic stainless steel. The compressor 5 is secured to the compressor mounting plate 3, which is mounted on the upper support plate 1 with vibration isolation pads 2 evenly distributed throughout.

[0083] To effectively dissipate heat from the compressor 5 and maintain the refrigerator's refrigeration efficiency, the compressor mounting plate 3 is preferably made of aluminum alloy. Vibration isolation pads 2 are used to reduce vibration transmitted from the compressor 5 to the upper support plate 1. The number of isolation pads 2 is 4-8, preferably 4, and the preferred material is silicone.

[0084] Furthermore, fixing rods 4 are used to connect the upper support plate 1 and the lower support plate 7. Vibration isolation pads 4-1 are installed between the fixing rods 4 and the upper support plate 1 to reduce vibration generated by the compressor 5 that is transmitted along the fixing rods 4 to the lower support plate 7. The number of fixing rods 4 ranges from 4 to 8, preferably 4, and the preferred material is non-magnetic austenitic stainless steel or aluminum alloy. The number of vibration isolation pads 4-1 matches the number of fixing rods 4, preferably 4, and the preferred material is silicone.

[0085] Vibration isolation pads 8 are installed at both ends of the fixing rods 9 to isolate the lower support plate 7 from the bottom 15 of the middle frame II. The fixing rods 9 and vibration isolation pads 8 further reduce vibration transmitted from the compressor 5 along the component structure. There are 4-8 fixing rods 9, preferably 4, and the preferred material is polyester glass fiber reinforced material. The number of vibration isolation pads 8 is twice the number of outer fixing rods 9, and the preferred material is butadiene rubber (BR).

[0086] Hose 6 passes through mounting holes in lower support plate 7 to connect cold finger 10 to compressor 5. The refrigerator can be a pulse tube refrigerator or a Stirling refrigerator. Cold finger 10 is connected to cold finger mounting plate 11, which is preferably made of aluminum alloy.

[0087] In order to achieve the vacuum and low temperature environment required for the operation of the high-temperature superconducting interferometer, the cold finger 10, the cold finger mounting plate 11, the bellows 14, the bottom 15 of the middle frame II and the lower frame III shell 26 are airtightly connected to form a vacuum peripheral space.

[0088] To further isolate the cold finger 10 from the HTS interferometer 24, a bellows 14 is used to connect the cold finger mounting plate 11 and the bottom 15 of the middle frame II for vibration isolation, while also providing a vacuum environment for the HTS interferometer 24. Cold finger mounting plate support rods 13 (located on the inner side) and vibration isolation pads 12 are installed between the cold finger mounting plate 11 and the bottom 15 of the middle frame II, and around the periphery of the bellows 14. As can be appreciated, these vibration isolation features effectively reduce the transmission of vibration from the cold finger 10 to the bottom 15 of the middle frame II and the HTS interferometer 24.

[0089] The number of cold finger mounting plate support rods 13 is 4-8, preferably 4, and is preferably made of polyester fiberglass reinforced material. Vibration isolation pads 12 are mounted on both ends of the cold finger mounting plate support rods 13. The number of vibration isolation pads 12 is twice the number of cold finger mounting plate support rods 13, and the preferred material is butadiene rubber (BR).

[0090] On the basis of the above embodiment, one end of the cold platform support rod 19 is installed on the bottom 15 of the middle frame II through the vibration isolation pad 16, and the other end of the cold platform support rod 19 is connected to and fixed on the cold platform 20, thereby realizing spatial separation of the cold platform 20 and the cold finger 10, thereby further reducing the impact of the vibration generated by the shaking of the cold finger 10 on the high-temperature superconducting interferometer 24.

[0091] On the other hand, since the required operating temperature of the cold platform 20 is 77K or below, and the temperature of the bottom 15 of the middle frame II is 293K, to reduce cooling loss and lower the power consumption of the refrigerator, the cold platform support rods 19 are preferably thin-walled and made of a glass fiber reinforced composite material with poor thermal conductivity but good rigidity. The vibration isolation pads 16 are preferably made of silicone.

[0092] The cold chain cold screen 17 is used to reduce the radiation heat leakage of the flexible cold chain 18 and the cold finger 10. The bottom 15 of the middle frame II is provided with a through hole, and the cold chain cold screen 17 is installed on the cold platform 20 through the through hole. The outer diameter of the cold chain cold screen 17 is smaller than the radius of the through hole at the bottom 15 of the middle frame II.

[0093] The cold energy is transferred through the flexible cold chain 18 , one end of the flexible cold chain 18 is connected to the cold finger 10 , and the other end is connected to the cold platform 20 . Preferably, the material of the flexible cold chain 18 is oxygen-free copper or high-purity aluminum.

[0094] A secondary cold shield 21 and a removable cylindrical cold chain 22 are mounted on the cold platform 20. The interferometer mounting platform 23 is connected to the removable cylindrical cold chain 22, to which a high-temperature superconducting interferometer 24 and a primary cold shield 25 are mounted. The primary and secondary cold shields 25 and 21 are used to reduce radiation heat leakage from the removable cylindrical cold chain 22 and the high-temperature superconducting interferometer 24. The secondary cold shield 21 is mounted on the periphery of the cold platform 20, enclosing the removable cylindrical cold chain 22 and the components mounted thereon.

[0095] Figure 4 Shown Figure 1 The details in the figure can more clearly show the relative position relationship and installation method of the lower support plate 7 of the middle frame II, the cold platform support vibration isolation pad 16 and the cold platform support rod 19.

[0096] Figure 5 The cross-sectional structure after the detachable columnar cold chain 22 is removed is shown. It can be seen that the overall structure is the same as Figure 1 similar.

[0097] From the above description, it can be seen that a specific application example of the present invention provides a low-vibration, liquid nitrogen-free, high-temperature superconducting interferometer assembly, including: a refrigerator and a high-temperature superconducting interferometer, an upper frame for installing the compressor of the refrigerator; a lower frame for installing the high-temperature superconducting interferometer; a middle frame for installing the hose, cold finger and cold chain of the refrigerator; wherein the cold chain is used to transport the cold energy generated by the refrigerator to the high-temperature superconducting interferometer, and the upper frame, the middle frame and the lower frame are connected in sequence from top to bottom; at least one end of the fixed rods in the upper frame and the middle frame is provided with a seismic isolation pad; a cold finger mounting plate is provided inside the middle frame, and the cold finger mounting plate is connected to the cold finger mounting plate through the cold finger mounting plate The mounting plate support rod is connected to the bottom of the middle frame, and at least one of the two ends of the cold finger mounting plate support rod is provided with a shock-isolating pad; the cold finger passes through the cold finger mounting plate and transmits the cold energy to the high-temperature superconducting interferometer through the cold chain; at least two interferometer cold screens are arranged inside the lower frame, one of which is mounted on the outside of the high-temperature superconducting interferometer, and the remaining interferometer cold screens are sequentially mounted on the outside of the corresponding interferometer cold screens; and a bellows is provided between the cold finger mounting plate and the bottom of the middle frame, and is mounted on the outside of the cold chain, for forming a vacuum space with the cold finger mounting plate, the bottom of the middle frame and the lower frame, and reducing the vibration of the cold finger to the vacuum space. Specifically, the present invention has the following beneficial effects:

[0098] 1. The refrigerator compressor is installed on the fixed plate through the vibration isolation pad, which reduces the vibration transmission from the compressor to the upper support plate of the upper frame; further, the vibration isolation pad and the fixing rod of the upper frame reduce the vibration transmission from the upper support plate of the upper frame to the lower support plate of the upper frame.

[0099] 2. In the present invention, a fixing rod and a vibration isolation pad of the middle frame are added to the lower support plate of the upper frame and the lower support plate of the middle frame. While ensuring the rigidity of the mechanical structure, a vibration isolation structure is further added to further reduce the vibration of the compressor transmitted to the lower support plate of the upper frame, thereby reducing the vibration of the vacuum chamber.

[0100] 3. The refrigerator compressor is connected to the cold finger through a hose. After the cold finger of the refrigerator is fixed to the cold finger mounting plate, the influence of the vibration of the cold finger of the refrigerator on the vacuum chamber is further reduced by the bellows, the support rod of the cold finger mounting plate and the corresponding vibration isolation pad.

[0101] 4. The cold platform and the cold finger of the refrigerator are designed with spatial isolation and soft connection is used to transfer the cooling capacity, which reduces the impact of the vibration of the cold finger of the refrigerator on the high-temperature superconducting interferometer installed on the cold platform, thereby improving the detection effect.

[0102] 5. The cold platform is fixed by the cold platform support rod. The cold platform support rod is fixed to the lower support plate of the middle frame II with a multi-stage vibration isolation design through vibration isolation pads, which greatly reduces the vibration introduced into the cold platform and thus reduces the vibration of the high-temperature superconducting interferometer.

[0103] 6. A highly integrated installation of the refrigerator system and the vacuum cavity is achieved. The high-temperature superconducting interferometer is cooled by the refrigerator, which reduces the system size, allows the components to work uninterruptedly, and enables the portable use of the components.

[0104] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0105] The descriptions with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. The order of steps involved in each embodiment is used to schematically illustrate the implementation of the present invention, and the order of steps therein is not limited and can be appropriately adjusted as needed.

[0106] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0107] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between the various embodiments can be referenced across them. Each embodiment focuses on the differences from the other embodiments. In particular, since the system embodiments are generally similar to the method embodiments, their description is relatively simple. For relevant parts, reference can be made to the description of the method embodiments. Throughout this specification, reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the embodiments in this specification. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate the different embodiments or examples, and features of different embodiments or examples, described in this specification, without conflict.

[0108] The above description is merely an example of the embodiments of this specification and is not intended to limit the embodiments of this specification. For those skilled in the art, various modifications and variations of the embodiments of this specification are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of this specification shall be included within the scope of the claims of the embodiments of this specification.

Claims

1. A low-vibration, liquid nitrogen-free, high-temperature superconducting interferometer assembly, comprising: The refrigerator and the high-temperature superconducting interferometer are characterized by further comprising: An upper frame for mounting a compressor of the refrigerator; A lower frame, used for installing the high-temperature superconducting interferometer; The middle frame is used to install the hose, cold finger and cold chain of the refrigerator; wherein the cold chain is used to transport the cold energy generated by the refrigerator to the high-temperature superconducting interferometer, and the upper frame, the middle frame and the lower frame are connected in sequence from top to bottom; at least one end of the fixing rods in the upper frame and the middle frame is provided with a vibration isolation pad; A cold finger mounting plate is provided inside the middle frame, and the cold finger mounting plate is connected to the bottom of the middle frame via a cold finger mounting plate support rod, and at least one end of the cold finger mounting plate support rod is provided with a vibration isolation pad; the cold finger passes through the cold finger mounting plate and transmits the cooling energy to the high-temperature superconducting interferometer through the cold chain; At least two interferometer cold screens are arranged inside the lower frame, one of which is sleeved outside the high-temperature superconducting interferometer, and the remaining interferometer cold screens are sequentially sleeved outside the corresponding interferometer cold screens; and A bellows is provided between the cold finger mounting plate and the bottom of the middle frame and is sleeved on the outside of the cold chain to form a vacuum space with the cold finger mounting plate, the bottom of the middle frame and the lower frame, and to reduce the vibration of the cold finger to the vacuum space.

2. The high-temperature superconducting interferometer assembly according to claim 1, characterized in that: Also includes: The compressor mounting plate is used to mount the compressor to the upper support plate of the upper frame, and a vibration isolation pad is provided between the compressor mounting plate and the upper support plate of the upper frame.

3. The high-temperature superconducting interferometer assembly according to claim 1, characterized in that: The hose passes through the lower support plate of the upper frame; and The compressor is connected to the cold finger through the hose.

4. The high-temperature superconducting interferometer assembly according to claim 1, characterized in that: The cold chain includes a flexible cold chain and a detachable columnar cold chain; One end of the flexible cold chain is connected to the cold finger, and the other end is connected to one end of the detachable columnar cold chain. The other end of the detachable columnar cold chain is connected to the high-temperature superconducting interferometer.

5. The high-temperature superconducting interferometer assembly according to claim 4, characterized in that: Also includes: a cold platform, provided at the junction of the flexible cold chain and the detachable columnar cold chain in the lower frame; The cold platform support rod is arranged between the bottom of the middle frame and the cold platform, and is used to support the cold platform.

6. The high-temperature superconducting interferometer assembly according to claim 5, characterized in that: Also includes: The cold chain cold screen is arranged between the cold finger mounting plate and the cold platform, and is sleeved on the outside of the cold finger and the outside of the flexible cold chain.

7. The high-temperature superconducting interferometer assembly according to claim 5, characterized in that: Also includes: The interferometer mounting platform is arranged at the bottom of the detachable columnar cold chain and is used for mounting at least one high-temperature superconducting interferometer and an interferometer cold shield sleeved on the outside of the high-temperature superconducting interferometer.

8. The high-temperature superconducting interferometer assembly according to claim 7, characterized in that: The remaining interferometer cold screens are sequentially sleeved on the outside of the corresponding interferometer cold screens through the cold platform.

9. The high-temperature superconducting interferometer assembly according to any one of claims 1 to 8, characterized in that: The bellows is located inside the cold finger mounting plate support rod relative to the middle frame.

10. The high-temperature superconducting interferometer assembly according to claim 9, characterized in that: The outer diameter of the bellows and its flange is smaller than the diameter of the support rod of the cold finger mounting plate.

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