An ultra-low vibration top loading and unloading thermostat device

Abstract

The present invention discloses an ultra-low vibration top loading and unloading thermostat device, comprising a refrigerator (1), a vacuum chamber, a cryogenic valve (13), and a sample chamber (17) equipped with a sample rod (29). The refrigerator (1) is installed on a refrigerator support (49), and the refrigerator support (49) is supported on an outer frame (51) through a support vibration damper (50). The refrigerator cavity body inserted into the vacuum chamber is connected to the refrigerator (1) by a refrigerator vibration damping bellows (2), and the heat exchanger of the refrigerator (1) and the heat exchanger of the corresponding refrigerator cavity body adopt an annular plug-in structure; the upper end of the sample rod (29) is fixed on an air-floating optical platform (59) through a sample rod flange (30), and the sample rod flange (30) is connected to the sample chamber (17) through a sample chamber vibration damping bellows (34). The multiple composite vibration damping technology of the present invention can meet the ultra-low vibration requirements of 50 to 100 nm for samples.

Description

Technical Field

[0001] The present invention belongs to the field of vibration reduction technology in a cryostat, and in particular relates to a cryostat capable of measuring relevant property parameters of a sample in a low-temperature magnetic field environment, specifically an ultra-low vibration top loading and unloading type cryostat device using multiple composite vibration reduction. Background Art

[0002] In recent years, with the continuous development of advanced technology fields such as cryogenic optics, physical property measurement, and quantum, low-temperature thermostats must not only meet the requirements of refrigeration temperature and refrigeration capacity, but also improve vibration indicators on the original basis to reduce the interference of the vibration of the thermostat on the experimental results.

[0003] At present, thermostats with high requirements for vibration indicators often use pulse tube refrigerators as cooling sources. Compared with GM refrigerators, pulse tube refrigerators have the characteristics of low vibration, but their installation location is limited, their adaptability to sites and devices is poor, and their thermal stability is low. Since they have not yet been domestically produced, their costs are high. For thermostats using GM refrigerators as cooling sources, the current vibration reduction measures mainly include: (1) bellows connection in some locations; (2) soft connection between the sample chamber and the refrigerator cold head. However, in terms of vibration reduction effect, it cannot meet the generally required ultra-low vibration requirements of 50 to 100 nm. Summary of the invention

[0004] The purpose of the present invention is to provide an ultra-low vibration top loading and unloading thermostat device using multiple composite vibration reduction in view of the problems existing in the prior art; the device can meet the generally required ultra-low vibration requirements of 50 to 100 nm and can quickly change samples.

[0005] The purpose of the present invention is to be solved by the following technical solutions:

[0006] An ultra-low vibration top loading and unloading thermostat device comprises a refrigerator, a vacuum chamber, a cryogenic valve, and a sample chamber equipped with a sample rod, characterized in that: the refrigerator is mounted on a refrigerator bracket and the refrigerator bracket is supported on an outer frame through a bracket vibration damper, a refrigerator cavity body inserted into the vacuum chamber is connected to the refrigerator by a refrigerator vibration damping bellows, and a heat exchanger of the refrigerator and a heat exchanger of the corresponding refrigerator cavity body adopt an annular plug-in structure to isolate the vibration transmission at the cold head; the upper end of the sample rod is fixed on an air-floating optical platform through a sample rod flange, and the sample rod flange is connected to the sample chamber through a sample chamber vibration damping bellows. In the above structure, the vacuum chamber is used to cover the low-temperature part of the device to isolate it from the heat exchange with the external environment, and the whole is supported on the outer frame; the refrigerator is the main vibration source of the device, and the device isolates the refrigerator vibration through the refrigerator vibration-damping bellows, the refrigerator cavity and the bracket vibration damper, and realizes the vibration isolation between the sample rod and the thermostat cavity through the sample cavity vibration-damping bellows and the air-floating optical platform. By combining the above vibration isolation means, the ultra-low vibration requirement at the sample is finally achieved.

[0007] The vacuum chamber is connected to the vacuum chamber damper mounted on the outer frame through the vacuum chamber cylinder adapter plate, so that the device can achieve vibration isolation between the ground and the thermostat chamber through the vacuum chamber damper, thereby isolating the influence of ground vibration on the thermostat chamber.

[0008] A counterweight block 1 and a counterweight block 2 are provided on the refrigerator support on the inner side of the outer frame. The counterweight block 1 and the counterweight block 2 are used to level the refrigerator support and can increase the mass of the device subjected to forced vibration. Since the vibration of the refrigerator is mainly in the vertical direction, in order to avoid cantilever amplified vibration in the horizontal direction, a counterweight block is used for leveling so that the center of mass of the device is centered in the horizontal direction, and then the height of the vacuum chamber damper on the outer frame is adjusted to be consistent with the center of mass height to reduce the vibration in the horizontal direction. The counterweight block increases the mass of the forced vibration and can reduce the vibration amplitude.

[0009] The refrigerator cavity liquid helium outlet at the bottom of the refrigerator cavity is connected to the cryogenic valve liquid helium inlet at the bottom of the cryogenic valve through the refrigerator liquid helium pipeline, the cryogenic valve liquid helium outlet at the bottom of the cryogenic valve is connected to the sample cavity liquid helium inlet at the lower part of the sample cavity through the cryogenic valve liquid helium pipeline, and the sample cavity circulating helium interface at the upper part of the sample cavity is connected to the circulating helium inlet on the refrigerator through a helium circulating pipe with a circulating pump.

[0010] The helium circulation tube is connected to the charging interface that can be connected to the helium storage tank through the circulating helium charging tube with the circulating helium charging valve; the circulating helium charging tube is connected to the sample cavity static helium interface arranged on the inner tube of the sample cavity through the static helium charging tube with the static helium charging valve; the interface between the static helium charging tube and the circulating helium charging tube is located between the circulating helium charging valve and the charging interface, and the interface between the circulating helium charging tube and the helium circulation tube is located between the circulating pump and the circulating helium charging valve; since the sample cavity static helium interface is connected to the helium charging interface through the static helium charging tube and the circulating helium charging tube, the thermal conductivity of the static helium can be changed by adjusting the static helium pressure of the sample cavity, thereby controlling the thermal conductivity between the sample and the inner wall of the sample cavity; in addition, when changing the sample, the static helium charging valve is opened for purging, and the refrigerator does not need to be shut down, so that the sample can be quickly changed.

[0011] The sample rod flange is connected to a sample rod fixing plate fixed on an air-floating optical platform; a plurality of parallel heat radiation screens are arranged on the sample rod body of the sample rod inserted into the sample cavity, and the heat radiation screens are used to reduce radiation heat leakage at the sample; the sample cavity is thermally coupled to the primary heat radiation screen flange through the primary heat sink of the sample cavity, and the secondary heat sink of the sample cavity is thermally coupled to the secondary heat radiation screen flange.

[0012] The sample cavity comprises a sample cavity outer tube, a sample cavity inner tube and a sample cavity bottom tube. The sample cavity bottom tube is connected to the sample cavity outer tube and the sample cavity inner tube by welding a sample cavity adapter ring. The segmented structure can effectively reduce the processing difficulty of the sample cavity. The sample rod is suspended in the sample cavity and the end of the sample rod body of the sample rod is directly inserted into the middle of the sample cavity bottom tube. The sample cavity liquid helium inlet located on the sample cavity outer tube is used to connect the cryogenic valve liquid helium pipeline and the sandwich cavity formed by the sample cavity outer tube and the sample cavity inner tube. A flow limiting hole is provided in the sandwich cavity at the entrance of the sample cavity liquid helium inlet. The flow limiting hole can suppress the creep of superfluid helium at low temperature and effectively reduce heat leakage. The sample cavity adapter ring is provided below the flow limiting hole. The sample cavity heat exchanger connected to the sample cavity bottom tube is provided below the sample cavity adapter ring.

[0013] The sample chamber bottom tube is located in the secondary thermal radiation screen tube body and a superconducting magnet is installed on the periphery of the sample chamber bottom tube. The superconducting magnet is suspended in the secondary thermal radiation screen tube body by a magnet hanger fixed on the vacuum chamber flange and the superconducting magnet is installed concentrically with the sample chamber bottom tube; the superconducting magnet is thermally coupled with the secondary thermal radiation screen flange through a magnet cooling block to realize magnet cooling, and the magnet leads led out from the side of the superconducting magnet pass through the secondary thermal radiation screen flange and the primary thermal radiation screen flange in turn and are led to the magnet lead vacuum interface on the vacuum chamber flange; the magnet leads are thermally coupled to the secondary thermal radiation screen flange through the magnet lead secondary heat sink and the magnet lead primary heat sink are thermally coupled to the primary thermal radiation screen flange, thereby reducing heat leakage.

[0014] The vacuum chamber is composed of a vacuum chamber cylinder and a vacuum chamber flange covering the vacuum chamber cylinder, a first-level heat radiation screen cavity composed of a first-level heat radiation screen flange and a first-level heat radiation screen cylinder is arranged in the vacuum chamber, and a second-level heat radiation screen cavity composed of a second-level heat radiation screen flange and a second-level heat radiation screen cylinder is arranged in the first-level heat radiation screen cavity; the refrigerator cavity comprises an upper refrigerator cavity section located between the vacuum chamber flange and the first-level heat radiation screen flange, a lower refrigerator cavity section located between the first-level heat radiation screen flange and the second-level heat radiation screen flange, and a The first-stage heat radiation screen flange is thermally coupled with the first-stage heat exchanger of the refrigerator cavity, and the second-stage heat radiation screen flange is thermally coupled with the second-stage heat exchanger of the refrigerator cavity. The first-stage heat exchanger of the refrigerator cavity and its corresponding first-stage heat exchanger of the refrigerator adopt a non-direct-contact annular plug-in structure configuration, and the second-stage heat exchanger of the refrigerator cavity and its corresponding second-stage heat exchanger of the refrigerator adopt a non-direct-contact annular plug-in structure configuration. The heat exchanger adopting the annular plug-in structure transfers heat through helium or liquid helium without direct contact, thereby isolating the vibration transmission at the cold head of the refrigerator.

[0015] The upper end of the cryogenic valve is fixed on the vacuum chamber flange and the automatic control mechanism of the cryogenic valve is installed on the vacuum chamber flange; the cryogenic valve is thermally coupled to the first-level heat radiation screen flange through the first-level heat sink of the cryogenic valve, and is thermally coupled to the second-level heat radiation screen flange through the second-level heat sink of the cryogenic valve.

[0016] The device uses a cryogenic valve with an automatic control mechanism. The flow rate of liquid helium is adjusted by adjusting the opening of the cryogenic valve to achieve the distribution of cold between the sample and the superconducting magnet. The superconducting magnet generates heat during field scanning, and the temperature rises. The opening of the cryogenic valve is reduced to reduce the flow rate of liquid helium. At the same time, the heating amount of the sample cavity is reduced to maintain the temperature stability of the superconducting magnet and the sample.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The device of the present invention adopts a refrigerator vibration-damping bellows, a segmented refrigerator cavity and a bracket vibration damper to achieve vibration isolation between the refrigerator and the thermostat cavity; adopts a vacuum cavity vibration damper to achieve vibration isolation between the ground and the thermostat cavity; adopts a sample cavity vibration-damping bellows and an air-floating optical platform to achieve vibration isolation between the sample rod and the thermostat cavity; and reduces the vibration of the sample rod through multiple composite vibration damping, so that when a GM refrigerator is used as a cold source, the ultra-low vibration requirement of 50 to 100 nm of the sample can be met.

[0019] The device of the present invention adopts a cryogenic valve with an automatic control mechanism, and the flow rate of liquid helium is adjusted by adjusting the opening of the cryogenic valve to achieve cold capacity distribution between the sample and the superconducting magnet; the superconducting magnet generates heat during field scanning, the temperature rises, the opening of the cryogenic valve is reduced, the flow rate of liquid helium is reduced, and at the same time, the heating amount of the sample cavity is reduced to maintain the temperature stability of the superconducting magnet and the sample.

[0020] The static helium interface of the sample chamber in the device of the present invention is connected to the helium charging interface through a pipeline. By adjusting the static helium pressure in the sample chamber, the thermal conductivity of the static helium can be changed, thereby controlling the thermal conductivity between the sample and the inner wall of the sample chamber. In addition, when changing samples, the static helium charging valve is opened for purging, and the refrigerator does not need to be shut down, so that rapid sample change can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 It is a structural schematic diagram of the ultra-low vibration top loading and unloading type thermostat device of the present invention;

[0022] Attached Figure 2 It is the vibration reduction technology roadmap of the ultra-low vibration top loading and unloading type thermostat device of the present invention.

[0023] Among them: 1—refrigerator; 2—refrigerator vibration damping bellows; 3—upper section of refrigerator cavity; 4—primary heat exchanger of refrigerator; 5—primary heat exchanger of refrigerator cavity; 6—lower section of refrigerator cavity; 7—secondary heat exchanger of refrigerator; 8—secondary heat exchanger of refrigerator cavity; 9—liquid helium outlet of refrigerator cavity; 10—liquid helium pipeline of refrigerator; 11—liquid helium inlet of cryogenic valve; 12—liquid helium outlet of cryogenic valve; 13—cryogenic valve; 14—primary heat sink of cryogenic valve; 15—Secondary heat sink of cryogenic valve; 16—Liquid helium pipeline of cryogenic valve; 17—Sample chamber; 18—External tube of sample chamber; 19—Inner tube of sample chamber; 20—Liquid helium inlet of sample chamber; 21—Adapter ring of sample chamber; 22—Flow limiting hole; 23—Heat exchanger of sample chamber; 24—Bottom tube of sample chamber; 25—First-stage heat sink of sample chamber; 26—Second-stage heat sink of sample chamber; 27—Static helium interface of sample chamber; 28—Circulating helium interface of sample chamber; 29—Sample rod; 30 —sample rod flange; 31—sample rod body; 32—thermal radiation screen; 33—sample rod fixing plate; 34—sample chamber vibration damping bellows; 35—superconducting magnet; 36—magnet suspension rod; 37—magnet lead wire; 38—first-level heat sink for magnet lead wire; 39—second-level heat sink for magnet lead wire; 40—magnet lead wire through vacuum interface; 41—vacuum chamber flange; 42—vacuum chamber cylinder; 43—first-level thermal radiation screen flange; 44—first-level thermal radiation screen cylinder; 45 —Second-stage thermal radiation screen flange; 46—Second-stage thermal radiation screen cylinder; 47—Counterweight block one; 48—Counterweight block two; 49—Refrigerator bracket; 50—Bracket shock absorber; 51—Outer frame; 52—Vacuum chamber cylinder adapter plate; 53—Vacuum chamber shock absorber; 54—Circulating pump; 55—Circulating helium inlet; 56—Static helium inflation valve; 57—Circulating helium inflation valve; 58—Inflation interface; 59—Air-floating optical platform; 60—Magnet cooling block. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1The present embodiment provides an ultra-low vibration top loading and unloading thermostat device, which includes a GM refrigerator 1, a thermostat cavity, a cryogenic valve 13, and a sample cavity 17 equipped with a sample rod 29, wherein the refrigerator 1 is installed on a refrigerator bracket 49, and the refrigerator bracket 49 is installed on an outer frame 51. The thermostat cavity is used to cover the low-temperature part of the device to isolate it from the heat exchange with the external environment, and is supported on the outer frame 51 as a whole; specifically, the thermostat cavity includes a vacuum cavity, a primary thermal radiation screen cavity, and a secondary thermal radiation screen cavity, the secondary thermal radiation screen cavity is suspended in the primary thermal radiation screen cavity, and the primary thermal radiation screen cavity is suspended in the vacuum cavity, the above-mentioned vacuum cavity is composed of a vacuum cavity cylinder 42 and a vacuum cavity flange 41 covering the vacuum cavity cylinder 42, a primary thermal radiation screen cavity composed of a primary thermal radiation screen flange 43 and a primary thermal radiation screen cylinder 44 is provided in the vacuum cavity, and a primary thermal radiation screen cavity is provided in the primary thermal radiation screen cavity A secondary heat radiation screen cavity composed of a secondary heat radiation screen flange 45 and a secondary heat radiation screen cylinder 46 is provided in the body; the refrigerator cavity includes a refrigerator cavity upper section 3 located between the vacuum cavity flange 41 and the primary heat radiation screen flange 43, and a refrigerator cavity lower section 6 located between the primary heat radiation screen flange 43 and the secondary heat radiation screen flange 45; a refrigerator cavity primary heat exchanger 5 is thermally coupled to the primary heat radiation screen flange 43, and a refrigerator cavity secondary heat exchanger 8 is thermally coupled to the secondary heat radiation screen flange 45; the refrigerator cavity primary heat exchanger 5 and its corresponding refrigerator cavity primary heat exchanger 4 adopt a non-direct contact annular plug-in structure configuration, and the refrigerator cavity secondary heat exchanger 8 and its corresponding refrigerator cavity secondary heat exchanger 7 adopt a non-direct contact annular plug-in structure configuration; the heat exchanger adopting the annular plug-in structure transfers heat through helium or liquid helium without direct contact, thereby isolating the vibration transmission at the cold head of the refrigerator. The upper end of the cryogenic valve 13 is fixed on the vacuum chamber flange 41 and the automatic control mechanism of the cryogenic valve 13 is installed on the vacuum chamber flange 41. The cryogenic valve 13 is thermally coupled to the primary heat radiation screen flange 43 through the primary heat sink 14 of the cryogenic valve, and is thermally coupled to the secondary heat radiation screen flange 45 through the secondary heat sink 15 of the cryogenic valve in sequence; the sample chamber 17 is thermally coupled to the primary heat radiation screen flange 43 through the primary heat sink 25 of the sample chamber, and is thermally coupled to the secondary heat radiation screen flange 45 through the secondary heat sink 26 of the sample chamber; the sample rod 29 is suspended in the sample chamber 17 and the end of the sample rod 29 is directly inserted into the middle of the sample chamber bottom tube 24, and is fixed on the outermost air-floating optical platform 59 of the device; the sample chamber bottom tube 24 is in the secondary heat radiation screen cylinder 46, and magnetic fields and other influences can be applied to the outside of the sample chamber bottom tube 24.

[0026] A circulating helium gas inlet 55 is provided on the refrigerator cavity, and the circulating helium gas inlet 55 is connected to a helium gas circulation pipe with a circulating pump 54; the refrigerator cavity liquid helium outlet 9 at the bottom of the refrigerator cavity lower section 6 is connected to the cryogenic valve 13 through the refrigerator liquid helium pipeline 10, the cryogenic valve liquid helium outlet 12 is connected to the sample cavity 17, and the sample cavity circulating helium gas interface 28 at the upper part of the sample cavity 17 is connected to the helium gas circulation pipe.

[0027] Furthermore, a superconducting magnet 35 can be installed on the periphery of the sample chamber bottom cylinder 24. The superconducting magnet 35 is suspended in the secondary heat radiation screen cylinder 46 through a magnet suspension rod 36 fixed on the vacuum chamber flange 41, and is installed concentrically with the sample chamber bottom cylinder 24. The cooling of the superconducting magnet 35 is achieved by thermally coupling the magnet cooling block 60 with the secondary heat radiation screen flange 45. The magnet lead 37 is led out from the side of the superconducting magnet 35, passes through the secondary heat radiation screen flange 45 and the primary heat radiation screen flange 43 in sequence, and leads to the magnet lead through vacuum interface 40 on the vacuum chamber flange 41; in addition, the magnet lead 37 is thermally coupled to the secondary heat radiation screen flange 45 through the magnet lead secondary heat sink 39, and thermally coupled to the primary heat radiation screen flange 43 through the magnet lead primary heat sink 38, so as to reduce heat leakage.

[0028] Further, the operation process of the helium circulation cooling sample in the device of the present invention is as follows: the helium enters the upper section 3 of the refrigerator cavity from the circulating helium inlet 55, exchanges heat with the first-stage cold head of the refrigerator, the first-stage heat exchanger 4 of the refrigerator uses the circulating helium as the cooling medium to perform non-contact heat exchange with the first-stage heat exchanger 5 of the refrigerator cavity, cools the first-stage heat radiation screen flange 43 and the first-stage heat radiation screen cylinder 44, and the heat exchange process at the second-stage cold head of the refrigerator can be obtained by the same logic; the circulating helium is liquefied after heat exchange with the second-stage cold head of the refrigerator, flows out from the liquid helium outlet 9 at the bottom of the refrigerator cavity, and enters the cryogenic Valve 13 throttles and cools down; the throttled helium is in a gas-liquid coexistence state, and enters the sandwich cavity formed by the sample cavity outer tube 18 and the sample cavity inner tube 19 through the sample cavity liquid helium inlet 20, and the liquid helium flows into the sample cavity heat exchanger 23 to evaporate and absorb heat to cool the sample cavity bottom tube 24; the sample cavity 17 is filled with static helium through the sample cavity static helium interface 27, and the throttled helium cools the sample cavity inner tube 19, and the sample cavity inner tube 19 then cools the sample through the static helium conduction cooling; the heat-exchanged helium is extracted and pressurized by the circulation pump 54 through the sample cavity circulation helium interface 28 at the upper part of the sandwich cavity, completing a helium cycle.

[0029] Specifically, the sample changing process of the device of the present invention is as follows: first, ensure that the charging interface 58 is connected to the helium storage tank, and open the valve of the storage tank; then open the static helium charging valve 56 to maintain a certain positive pressure; next, loosen the sample rod flange 30, pull out the sample rod 29 upward, and complete the sample changing. During this process, there is always helium purging, and impurities such as air will not be mixed into the sample chamber 17. Since the sample chamber 17 and the circulating helium operate independently, the sample changing process does not require shutdown.

[0030] Because see Figure 2 The present embodiment provides an ultra-low vibration top loading and unloading thermostat device, the vibration reduction process of which mainly includes three parts: vibration isolation between the refrigerator 1 and the thermostat cavity, vibration isolation between the ground and the thermostat cavity, and vibration isolation between the sample rod 29 and the thermostat cavity. Specifically, 1. Vibration isolation between the refrigerator and the thermostat cavity: the refrigerator 1 is installed on the refrigerator bracket 49, and the refrigerator bracket 49 is supported on the outer frame 51 through the bracket vibration damper 50, which reduces part of the vibration; the refrigerator 1 and the upper end 3 of the refrigerator cavity are connected by a refrigerator vibration damping bellows 2 to further reduce the vibration; the refrigerator heat exchanger and the corresponding refrigerator cavity heat exchanger adopt an annular plug-in structure, which transfers heat through helium or liquid helium, without direct contact, and isolates the vibration transmission at the cold head of the refrigerator. 2. Vibration isolation between the ground and the thermostat cavity: The vacuum chamber cylinder 42 is supported on the outer frame 51 through the vacuum chamber cylinder adapter plate 52 and the vacuum chamber vibration damper 53, isolating the influence of ground vibration on the thermostat cavity. 3. Vibration isolation between the sample rod and the thermostat cavity: The upper end of the sample rod 29 is provided with a sample rod flange 30, which is connected to the sample rod fixing plate 33 fixed to the air-floating optical platform 59. The sample rod flange 30 is also connected to the sample cavity 17 through the sample cavity vibration damping bellows 34, isolating the vibration transmission between the sample rod 29 and the thermostat cavity and the ground.

[0031] In addition, since the vibration of the refrigerator 1 is mainly in the vertical direction, in order to avoid cantilever amplified vibration in the horizontal direction, a counterweight is used for leveling so that the center of mass of the device is centered in the horizontal direction, and then the height setting of the vacuum chamber damper 53 is adjusted to be consistent with the center of mass height to reduce the vibration in the horizontal direction; the counterweight increases the mass of the device that is forced to vibrate, which can reduce the vibration amplitude of the device.

[0032] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention; any technology not involved in the present invention can be realized by existing technologies.

Claims

1. An ultra-low vibration top loading and unloading type thermostat device, comprising a refrigerator (1), a vacuum chamber, a cryogenic valve (13), and a sample chamber (17) equipped with a sample rod (29), characterized in that: The refrigerator (1) is mounted on a refrigerator support (49), and the refrigerator support (49) is supported on an outer frame (51) via a support vibration damper (50); a refrigerator cavity inserted into the vacuum cavity is connected to the refrigerator (1) via a refrigerator vibration damping bellows (2); and a heat exchanger of the refrigerator (1) and a heat exchanger of the corresponding refrigerator cavity adopt an annular plug-in structure to isolate vibration transmission at the cold head; the upper end of the sample rod (29) is fixed to the air-floating optical platform (59) via a sample rod flange (30), and the sample rod flange (30) is connected to the sample cavity (17) via a sample cavity vibration damping bellows (34); The vacuum chamber is connected to a vacuum chamber vibration damper (53) mounted on an outer frame (51) via a vacuum chamber cylinder adapter plate (52); A first counterweight (47) and a second counterweight (48) are provided on the refrigerator support (49) on the inner side of the outer frame (51), wherein the first counterweight (47) and the second counterweight (48) are used to level the refrigerator support (49) and can increase the mass of the device subjected to forced vibration; The vacuum chamber is composed of a vacuum chamber cylinder (42) and a vacuum chamber flange (41) covering the vacuum chamber cylinder (42); a first-level heat radiation screen cavity composed of a first-level heat radiation screen flange (43) and a first-level heat radiation screen cylinder (44) is provided in the vacuum chamber; a second-level heat radiation screen cavity composed of a second-level heat radiation screen flange (45) and a second-level heat radiation screen cylinder (46) is provided in the first-level heat radiation screen cavity; the refrigerator cavity comprises a refrigerator cavity upper section (3) located between the vacuum chamber flange (41) and the first-level heat radiation screen flange (43); The lower section (6) of the refrigerator cavity between the screen flange (43) and the secondary heat radiation screen flange (45) is thermally coupled to a refrigerator cavity primary heat exchanger (5) on the primary heat radiation screen flange (43) and thermally coupled to a refrigerator cavity secondary heat exchanger (8) on the secondary heat radiation screen flange (45); the refrigerator cavity primary heat exchanger (5) and its corresponding refrigerator cavity primary heat exchanger (4) are configured in an annular plug-in structure without direct contact, and the refrigerator cavity secondary heat exchanger (8) and its corresponding refrigerator cavity secondary heat exchanger (7) are configured in an annular plug-in structure without direct contact.

2. The ultra-low vibration top-loading type thermostat device according to claim 1, characterized in that: The refrigerator cavity liquid helium outlet (9) at the bottom of the refrigerator cavity is connected to the cryogenic valve liquid helium inlet (11) at the bottom of the cryogenic valve (13) through a refrigerator liquid helium pipeline (10); the cryogenic valve liquid helium outlet (12) at the bottom of the cryogenic valve (13) is connected to the sample cavity liquid helium inlet (20) at the bottom of the sample cavity (17) through a cryogenic valve liquid helium pipeline (16); and the sample cavity circulating helium interface (28) at the top of the sample cavity (17) is connected to the circulating helium inlet (55) on the refrigerator (1) through a helium circulating pipe with a circulating pump (54).

3. The ultra-low vibration top-loading type thermostat device according to claim 2, characterized in that: The helium circulation tube is connected to a charging interface (58) capable of being connected to a helium storage tank via a circulating helium charging tube with a circulating helium charging valve (57); the circulating helium charging tube is connected to a sample cavity static helium interface (27) provided on the sample cavity inner tube (19) via a static helium charging tube with a static helium charging valve (56); the interface between the static helium charging tube and the circulating helium charging tube is located between the circulating helium charging valve (57) and the charging interface (58), and the interface between the circulating helium charging tube and the helium circulation tube is located between the circulating pump (54) and the circulating helium charging valve (57).

4. The ultra-low vibration top-loading and detachable thermostat device according to any one of claims 1, 2 and 3, characterized in that: The sample rod flange (30) is connected to a sample rod fixing plate (33) fixed on an air-floating optical platform (59); a plurality of parallel heat radiation screens (32) are provided on a sample rod body (31) of the sample rod (29) inserted into the sample cavity (17); the sample cavity (17) is thermally coupled to a primary heat radiation screen flange (43) through a primary heat sink (25) of the sample cavity, and a secondary heat sink (26) of the sample cavity is thermally coupled to a secondary heat radiation screen flange (45).

5. The ultra-low vibration top-loading type thermostat device according to any one of claims 1, 2, and 3, characterized in that: The sample chamber (17) comprises a sample chamber outer tube (18), a sample chamber inner tube (19) and a sample chamber bottom tube (24); the sample chamber bottom tube (24) is connected to the sample chamber outer tube (18) and the sample chamber inner tube (19) by welding a sample chamber adapter ring (21) to form a whole; a sample rod (29) is suspended in the sample chamber (17) and the end of the sample rod body (31) of the sample rod (29) is directly inserted into the middle of the sample chamber bottom tube (24); The sample chamber liquid helium inlet (20) on the (18) is used to connect the cryogenic valve liquid helium pipeline (16) with the interlayer chamber formed by the sample chamber outer tube (18) and the sample chamber inner tube (19). A flow limiting hole (22) is provided in the interlayer chamber at the entrance of the sample chamber liquid helium inlet (20). Below the flow limiting hole (22) is a sample chamber adapter ring (21). Below the sample chamber adapter ring (21) is a sample chamber heat exchanger (23) connected to the sample chamber bottom tube (24).

6. The ultra-low vibration top-loading type thermostat device according to claim 5, characterized in that: The sample chamber bottom cylinder (24) is located in the secondary thermal radiation screen cylinder (46) and a superconducting magnet (35) is installed on the periphery of the sample chamber bottom cylinder (24). The superconducting magnet (35) is suspended in the secondary thermal radiation screen cylinder (46) through a magnet suspension rod (36) fixed on the vacuum chamber flange (41) and the superconducting magnet (35) and the sample chamber bottom cylinder (24) are installed concentrically. The superconducting magnet (35) is thermally coupled to the secondary thermal radiation screen flange (45) through a magnet cooling block (60). To achieve magnet cooling, a magnet lead (37) led out from the side of the superconducting magnet (35) passes through the secondary thermal radiation screen flange (45) and the primary thermal radiation screen flange (43) in sequence and is led to the magnet lead through vacuum interface (40) on the vacuum chamber flange (41); the magnet lead (37) is thermally coupled to the secondary thermal radiation screen flange (45) through a magnet lead secondary heat sink (39), and is thermally coupled to the primary thermal radiation screen flange (43) through a magnet lead primary heat sink (38).

7. The ultra-low vibration top-loading type thermostat device according to claim 1, characterized in that: The upper end of the cryogenic valve (13) is fixed on the vacuum chamber flange (41) and the automatic control mechanism of the cryogenic valve (13) is installed on the vacuum chamber flange (41); the cryogenic valve (13) is thermally coupled to the primary heat radiation screen flange (43) through the primary heat sink (14) of the cryogenic valve, and is thermally coupled to the secondary heat sink (15) of the cryogenic valve and the secondary heat radiation screen flange (45) in sequence.

Images