CN113533013A - Ultralow vibration top loading and unloading type thermostat device - Google Patents
Ultralow vibration top loading and unloading type thermostat device Download PDFInfo
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- CN113533013A CN113533013A CN202110937503.1A CN202110937503A CN113533013A CN 113533013 A CN113533013 A CN 113533013A CN 202110937503 A CN202110937503 A CN 202110937503A CN 113533013 A CN113533013 A CN 113533013A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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Abstract
The invention discloses an ultralow-vibration top-end-loading-unloading type thermostat device which comprises a refrigerator (1), a vacuum cavity, a low-temperature valve (13) and a sample cavity (17) provided with a sample rod (29), wherein the refrigerator (1) is arranged on a refrigerator bracket (49), the refrigerator bracket (49) is supported on an outer frame (51) through a bracket shock absorber (50), a refrigerator cavity inserted into the vacuum cavity is connected with the refrigerator (1) through a refrigerator shock absorption corrugated pipe (2), and a heat exchanger of the refrigerator (1) and a heat exchanger of a corresponding refrigerator cavity are in an annular opposite-insertion type structure; the upper end of the sample rod (29) is fixed on the air floatation optical platform (59) through a sample rod flange (30), and the sample rod flange (30) is connected with the sample cavity (17) through a sample cavity vibration reduction corrugated pipe (34). The multiple composite vibration reduction technology can meet the requirement of 50-100 nm of ultra-low vibration of a sample.
Description
Technical Field
The invention belongs to the technical field of vibration reduction in a cryostat, and particularly relates to a cryostat capable of measuring related property parameters of a sample in a low-temperature magnetic field environment, in particular to an ultralow-vibration top-loading-unloading type thermostat device adopting multiple composite vibration reduction.
Background
In recent years, with the continuous development of advanced technical fields such as low-temperature optics, physical property measurement, quantum and the like, a cryostat not only needs to meet the requirements of refrigeration temperature and refrigeration capacity, but also needs to improve the vibration index on the original basis so as to reduce the interference of the vibration of the cryostat on experimental results.
At present, a pulse tube refrigerator is often adopted as a cold source for thermostats with higher requirements on vibration indexes. Compared with GM refrigerator, the pulse tube refrigerator has the characteristic of low vibration, but the installation position of the pulse tube refrigerator is limited, the pulse tube refrigerator has poor adaptability to fields and devices and lower thermal stability, and the cost is higher because the localization is not realized temporarily. The current vibration reduction measures of the thermostat adopting the GM refrigerator as a cold source mainly comprise the following steps: (1) part of the positions are connected by corrugated pipes; (2) the sample cavity is flexibly connected with the cold head of the refrigerator. However, the requirement of 50 to 100nm for ultra-low vibration, which is a common requirement, cannot be satisfied in terms of vibration damping effect.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an ultralow-vibration top-loading-unloading type thermostat device adopting multiple composite vibration reduction; the device can meet the general requirement of 50-100 nm ultralow vibration requirement and can change samples quickly.
The invention aims to solve the problems by the following technical scheme:
the utility model provides an ultralow vibration top loading and unloading type thermostat device, includes refrigerator, vacuum cavity, low temperature valve, installs the sample chamber of sample pole, its characterized in that: the refrigerator is arranged on a refrigerator bracket, the refrigerator bracket is supported on the outer frame through a bracket shock absorber, a refrigerator vibration reduction corrugated pipe is adopted to connect a refrigerator cavity inserted into the vacuum cavity and the refrigerator, and a heat exchanger of the refrigerator and a heat exchanger of a corresponding refrigerator cavity adopt an annular opposite-insertion structure to isolate vibration transmission at a cold head; the upper end of the sample rod is fixed on the air-flotation optical platform through a sample rod flange, and the sample rod flange is connected with the sample cavity through a sample cavity vibration reduction corrugated pipe. In the structure, the vacuum cavity is used for covering the low-temperature part of the device, isolating the heat exchange between the vacuum cavity and the external environment and integrally supporting on the outer frame; the refrigerator is a main vibration source of the device, the device realizes the isolation of the vibration of the refrigerator through the vibration reduction corrugated pipe of the refrigerator, a refrigerator cavity and a support vibration absorber, realizes the vibration isolation between the sample rod and the thermostat cavity through the vibration reduction corrugated pipe of the sample cavity and the air flotation optical platform, integrates the vibration isolation means, and finally realizes the ultra-low vibration requirement of the sample.
The vacuum cavity is connected with a vacuum cavity absorber installed on the outer frame through a vacuum cavity barrel adapter plate, so that the device realizes vibration isolation between the ground and the thermostat cavity through the vacuum cavity absorber, and the influence of ground vibration on the thermostat cavity is isolated.
A first balancing weight and a second balancing weight are arranged on the refrigerator bracket on the inner side of the outer frame, are used for leveling the refrigerator bracket and can increase the forced vibration quality of the device; the vibration of the refrigerator is mainly along the vertical direction, so that the cantilever amplified vibration is avoided in the horizontal direction, the balancing weight is adopted for leveling, the mass center of the device is centered in the horizontal direction, then the height of the vacuum cavity vibration absorber on the outer frame is adjusted to be consistent with the height of the mass center, the vibration in the horizontal direction is reduced, the mass of forced vibration is increased by the balancing weight, and the vibration amplitude can be reduced.
And a refrigerator cavity liquid helium outlet at the bottom of the refrigerator cavity is communicated with a low-temperature valve liquid helium inlet at the bottom of the low-temperature valve through a refrigerator liquid helium pipeline, a low-temperature valve liquid helium outlet at the bottom end of the low-temperature valve is communicated with a sample cavity liquid helium inlet at the lower part of the sample cavity through a low-temperature valve liquid helium pipeline, and a sample cavity circulating helium interface at the upper part of the sample cavity is communicated with a circulating helium inlet on the refrigerator through a helium circulating pipe with a circulating pump.
The helium circulating pipe is communicated with an inflation interface which can be communicated with a helium storage tank through a circulating helium inflation pipe with a circulating helium inflation valve; the circulating helium gas filling pipe is communicated with a sample cavity static helium gas interface arranged on the sample cavity inner pipe through a static helium gas filling pipe with a static helium gas filling valve; the interface of the static helium gas filling pipe and the circulating helium gas filling pipe is positioned between the circulating helium gas filling valve and the gas filling interface, and the interface of the circulating helium gas filling pipe and the helium circulating pipe is positioned between the circulating pump and the circulating helium gas filling valve; because the static helium interface of the sample cavity is connected with the helium inflation interface through the static helium inflation tube and the circulating helium inflation tube, the heat conductivity coefficient of the static helium can be changed by adjusting the pressure of the static helium in the sample cavity, so that the heat conductivity of the sample and the inner wall of the sample cavity is controlled; in addition, the static helium gas charging valve is opened for purging during sample changing, the refrigerating machine does not need to be shut down, and the rapid sample changing of the sample can be realized.
The sample rod flange is connected with a sample rod fixing plate fixed on the air-floating optical platform; a plurality of heat radiation screens which are arranged in parallel are arranged on a sample rod body of the sample rod inserted into the sample cavity, and the heat radiation screens are used for reducing radiation heat leakage at the sample; the sample cavity is thermally coupled on the flange of the primary heat radiation screen through the primary heat sink of the sample cavity, and the second heat sink of the sample cavity is thermally coupled on the flange of the second heat radiation screen.
The sample cavity comprises a sample cavity outer pipe, a sample cavity inner pipe and a sample cavity bottom barrel, the sample cavity bottom barrel is connected with the sample cavity outer pipe and the sample cavity inner pipe into a whole by welding a sample cavity switching ring, the sectional structure can effectively reduce the processing difficulty of the sample cavity, the sample rod is suspended in the sample cavity, and the tail end of a sample rod body of the sample rod is directly inserted into the middle part of the sample cavity bottom barrel; the sample cavity liquid helium inlet on the sample cavity outer pipe is used for communicating an interlayer cavity formed by the low-temperature valve liquid helium pipeline, the sample cavity outer pipe and the sample cavity inner pipe, a flow limiting hole is formed in the interlayer cavity at the sample cavity liquid helium inlet, the flow limiting hole can inhibit overflow helium from crawling at a low temperature and effectively reduce heat leakage, a sample cavity switching ring is arranged below the flow limiting hole, and a sample cavity heat exchanger connected with a sample cavity bottom cylinder is arranged below the sample cavity switching ring.
The sample cavity bottom barrel is positioned in the secondary heat radiation screen barrel, a superconducting magnet is arranged on the periphery of the sample cavity bottom barrel, the superconducting magnet is suspended in the secondary heat radiation screen barrel through a magnet suspension rod fixed on a vacuum cavity flange, and the superconducting magnet and the sample cavity bottom barrel are concentrically arranged; the superconducting magnet is thermally coupled with the secondary heat radiation screen flange through the magnet cold guide block to realize magnet cooling, and a magnet lead led out from the side surface of the superconducting magnet sequentially passes through the secondary heat radiation screen flange and the primary heat radiation screen flange and is led to a magnet lead penetrating vacuum interface on the vacuum cavity flange; the magnet lead is respectively thermally coupled on the secondary heat radiation screen flange through the secondary heat sink of the magnet lead, and the primary heat sink of the magnet lead is thermally coupled on the primary heat radiation screen flange, so that heat leakage is reduced.
The vacuum cavity consists of a vacuum cavity barrel and a vacuum cavity flange covering the vacuum cavity barrel, a primary heat radiation screen cavity body consisting of a primary heat radiation screen flange and a primary heat radiation screen barrel is arranged in the vacuum cavity, and a secondary heat radiation screen cavity body consisting of a secondary heat radiation screen flange and a secondary heat radiation screen barrel is arranged in the primary heat radiation screen cavity body; the refrigerator cavity include the refrigerator cavity upper segment that is located between vacuum cavity flange and the primary heat radiation screen flange, the refrigerator cavity hypomere that is located between primary heat radiation screen flange and the secondary heat radiation screen flange, the thermal coupling has refrigerator cavity primary heat exchanger and the thermal coupling has refrigerator cavity secondary heat exchanger on the secondary heat radiation screen flange on the primary heat radiation screen flange, refrigerator cavity primary heat exchanger adopts the annular of no direct contact to inserting formula configuration rather than the refrigerator primary heat exchanger that corresponds, and refrigerator cavity secondary heat exchanger adopts the annular of no direct contact to inserting formula configuration rather than the refrigerator secondary heat exchanger that corresponds, the heat exchanger that adopts the annular to inserting formula structure passes through helium or liquid helium transfer heat, no direct contact, the vibration transmission of refrigerator cold head department has been isolated.
The upper end of the low-temperature valve is fixed on the vacuum cavity flange, and the automatic control mechanism of the low-temperature valve is arranged on the vacuum cavity flange; the low-temperature valve is in thermal coupling connection with the first-level heat sink and the second-level heat radiation screen flange through the low-temperature valve first-level heat sink and the second-level heat radiation screen flange in sequence.
The device adopts a low-temperature valve with an automatic control mechanism, and the opening of the low-temperature valve is adjusted to adjust the flow of liquid helium so as to realize cold quantity distribution between a sample and a superconducting magnet; the temperature rises due to heat generated by a superconducting magnet field sweeping, the opening of the low-temperature valve is adjusted to be small, the flow of liquid helium is reduced, and meanwhile, the heating quantity of the sample cavity is adjusted to be small, so that the temperature stability of the superconducting magnet and the sample is maintained.
Compared with the prior art, the invention has the following advantages:
the device of the invention adopts the vibration reduction bellows of the refrigerator, the segmented refrigerator cavity and the bracket vibration absorber to realize the vibration isolation between the refrigerator and the thermostat cavity; vibration isolation between the ground and a thermostat cavity is realized by adopting a vacuum cavity vibration absorber; vibration isolation between the sample rod and the cavity of the thermostat is realized by adopting a sample cavity vibration reduction corrugated pipe and an air floatation optical platform; the vibration of the sample rod is reduced through multiple composite vibration reduction, and the ultralow vibration requirement of 50-100 nm of the sample can be met when a GM refrigerator is used as a cold source.
The device adopts the low-temperature valve with an automatic control mechanism, and adjusts the flow of the liquid helium by adjusting the opening of the low-temperature valve, so as to realize the cold energy distribution between the sample and the superconducting magnet; the temperature rises due to heat generated by a superconducting magnet field sweeping, the opening of the low-temperature valve is adjusted to be small, the flow of liquid helium is reduced, and meanwhile, the heating quantity of the sample cavity is adjusted to be small, so that the temperature stability of the superconducting magnet and the sample is maintained.
The static helium interface of the sample cavity in the device is connected with the helium inflation interface through a pipeline, and the heat conductivity coefficient of the static helium can be changed by adjusting the pressure of the static helium in the sample cavity, so that the heat conductivity of the sample and the inner wall of the sample cavity is controlled; in addition, the static helium gas charging valve is opened for purging during sample changing, the refrigerator does not need to be shut down, and the sample can be changed quickly.
Drawings
FIG. 1 is a schematic structural view of an ultra-low vibration top-loading and unloading thermostat assembly of the present invention;
FIG. 2 is a schematic diagram of the damping technique for the ultra-low vibration top-loading and unloading thermostat assembly of the present invention.
Wherein: 1-a refrigerator; 2-vibration damping bellows of refrigerator; 3-the upper section of the refrigerator cavity; 4-primary heat exchanger of refrigerator; 5, a primary heat exchanger of a refrigerator cavity; 6-lower section of refrigerator cavity; 7-secondary heat exchanger of refrigerator; 8, a secondary heat exchanger of a refrigerator cavity; 9-liquid helium outlet of refrigerator cavity; 10-liquid helium pipeline of refrigerator; 11-cryogenic valve liquid helium inlet; 12-a cryogenic valve liquid helium outlet; 13-a low temperature valve; 14-low temperature valve primary heat sink; 15-low temperature valve secondary heat sink; 16-low temperature valve liquid helium line; 17-a sample chamber; 18-sample lumen outer tube; 19-sample lumen tube; 20-sample chamber liquid helium inlet; 21-sample cavity adapter ring; 22-a flow restriction orifice; 23-sample chamber heat exchanger; 24-sample chamber bottom cylinder; 25-sample cavity primary heat sink; 26-sample cavity secondary heat sink; 27-sample chamber static helium interface; 28-sample chamber circulation helium interface; 29-sample rod; 30-sample rod flange; 31-sample rod body; 32-thermal radiation screen; 33-sample rod fixing plate; 34-sample chamber damping bellows; 35-superconducting magnet; 36-a magnet boom; 37-magnet lead; 38-magnet lead primary heat sink; 39-magnet lead secondary heat sink; 40-magnet lead wire through vacuum interface; 41-vacuum cavity flange; 42, vacuum cavity cylinder body; 43-primary thermal radiation screen flange; 44-primary heat radiation screen cylinder; 45-second grade heat radiation screen flange; 46-a secondary thermal radiation screen cylinder; 47-counterweight one; 48-balancing weight two; 49-refrigerator support; 50-bracket shock absorber; 51-an outer frame; 52-vacuum cavity cylinder adapter plate; 53-vacuum chamber shock absorber; 54-circulating pump; 55-circulating helium gas inlet; 56-static helium charging valve; 57-circulating helium gas charging valve; 58-inflation interface; 59-air floating optical platform; 60-magnet cold conducting block.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the ultra-low vibration top loading and unloading thermostat device provided by the embodiment comprises a GM refrigerator 1, a thermostat cavity, a low temperature valve 13, and a sample cavity 17 provided with a sample rod 29, wherein the refrigerator 1 is mounted on a refrigerator bracket 49, the refrigerator bracket 49 is mounted on an outer frame 51, the thermostat cavity is used for covering the low temperature part of the device, isolating the heat exchange between the thermostat cavity and the external environment, and is integrally supported on the outer frame 51; specifically, the thermostat cavity comprises a vacuum cavity, a primary heat radiation screen cavity and a secondary heat radiation screen cavity, wherein the secondary heat radiation screen cavity is suspended in the primary heat radiation screen cavity, and the primary heat radiation screen cavity is suspended in the vacuum cavity, the vacuum cavity is composed of a vacuum cavity cylinder 42 and a vacuum cavity flange 41 covering the vacuum cavity cylinder 42, the primary heat radiation screen cavity composed of a primary heat radiation screen flange 43 and a primary heat radiation screen cylinder 44 is arranged in the vacuum cavity, and the secondary heat radiation screen cavity composed of a secondary heat radiation screen flange 45 and a secondary heat radiation screen cylinder 46 is arranged in the primary heat radiation screen cavity; the refrigerator cavity comprises a refrigerator cavity upper section 3 positioned between a vacuum cavity flange 41 and a primary heat radiation screen flange 43, a refrigerator cavity lower section 6 positioned between the primary heat radiation screen flange 43 and a secondary heat radiation screen flange 45, a refrigerator cavity primary heat exchanger 5 is thermally coupled on the primary heat radiation screen flange 43, a refrigerator cavity secondary heat exchanger 8 is thermally coupled on the secondary heat radiation screen flange 45, the refrigerator cavity primary heat exchanger 5 and a refrigerator primary heat exchanger 4 corresponding to the refrigerator cavity primary heat exchanger adopt annular oppositely-inserted structural configuration without direct contact, the refrigerator cavity secondary heat exchanger 8 and a refrigerator secondary heat exchanger 7 corresponding to the refrigerator cavity secondary heat exchanger adopt annular oppositely-inserted structural configuration without direct contact, the heat exchanger adopting the annular oppositely-inserted structure transfers heat through helium or liquid helium, direct contact is avoided, and vibration transfer at a refrigerator cold head is isolated. The upper end of the low temperature valve 13 is fixed on a vacuum cavity flange 41, an automatic control mechanism of the low temperature valve 13 is installed on the vacuum cavity flange 41, the low temperature valve 13 is in thermal coupling connection with a primary heat radiation screen flange 43 through a low temperature valve primary heat sink 14 in sequence, and is in thermal coupling connection with a secondary heat radiation screen flange 45 through a low temperature valve secondary heat sink 15; the sample cavity 17 is thermally coupled on the primary heat radiation screen flange 43 through the sample cavity primary heat sink 25, and the sample cavity secondary heat sink 26 is thermally coupled on the secondary heat radiation screen flange 45; the sample rod 29 is suspended in the sample cavity 17, and the tail end of the sample rod 29 is directly inserted into the middle of the bottom barrel 24 of the sample cavity and is fixed on an air-floating optical platform 59 at the outermost side of the device; the sample cavity bottom barrel 24 is arranged in the secondary heat radiation screen barrel body 46, and a magnetic field and the like can be applied to the outside of the sample cavity bottom barrel 24.
A circulating helium gas inlet 55 is formed in the cavity of the refrigerating machine, and the circulating helium gas inlet 55 is connected with a helium circulating pipe with a circulating pump 54; a refrigerator cavity liquid helium outlet 9 at the bottom of the lower section 6 of the refrigerator cavity is connected with a low-temperature valve 13 through a refrigerator liquid helium pipeline 10, a low-temperature valve liquid helium outlet 12 is connected with a sample cavity 17, and a sample cavity circulating helium interface 28 at the upper part of the sample cavity 17 is connected with a helium circulating pipe.
Further, a superconducting magnet 35 may be installed on the periphery of the sample chamber bottom barrel 24, and the superconducting magnet 35 is suspended in the secondary thermal radiation screen barrel 46 by a magnet hanger 36 fixed on the vacuum chamber flange 41 and is installed concentrically with the sample chamber bottom barrel 24. The cooling of the superconducting magnet 35 is realized by thermally coupling the magnet cold guide block 60 with the secondary heat radiation screen flange 45, and the magnet lead wire 37 is led out from the side surface of the superconducting magnet 35, sequentially passes through the secondary heat radiation screen flange 45 and the primary heat radiation screen flange 43, and is led to the position of the magnet lead wire penetrating vacuum interface 40 on the vacuum cavity flange 41; further, the magnet lead 37 is thermally coupled to the secondary heat radiation screen flange 45 and the magnet lead primary heat sink 38 is thermally coupled to the primary heat radiation screen flange 43 through the magnet lead secondary heat sink 39, respectively, thereby reducing heat leakage.
Further, the operation of helium cycle cooling the sample in the apparatus of the present invention is as follows: helium enters the upper section 3 of the refrigerator cavity from the circulating helium inlet 55 to exchange heat with the primary cold head of the refrigerator, the primary heat exchanger 4 of the refrigerator carries out non-contact heat exchange with the primary heat exchanger 5 of the refrigerator cavity by taking the circulating helium as a cold guide medium, the primary heat radiation screen flange 43 and the primary heat radiation screen cylinder 44 are cooled, and the heat exchange process at the secondary cold head of the refrigerator can be obtained by the same method; the circulating helium is liquefied after exchanging heat with the secondary cold head of the refrigerator, flows out of a liquid helium outlet 9 at the bottom of a cavity of the refrigerator, enters a low-temperature valve 13 along a liquid helium pipeline 10 of the refrigerator, and is throttled and cooled; the throttled helium is in a gas-liquid coexisting state and enters a sandwich cavity formed by the sample cavity outer tube 18 and the sample cavity inner tube 19 together 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; static helium is filled in the sample cavity 17 through a sample cavity static helium interface 27, the throttled helium cools the sample cavity inner tube 19, and the sample cavity inner tube 19 is cooled through static helium conduction; the helium after heat exchange is pumped out by a circulating pump 54 through a sample cavity circulating helium interface 28 at the upper part of the interlayer cavity and pressurized, and a helium circulation is completed.
Further, the sample changing process of the device of the invention is as follows: firstly, ensuring that the inflation connector 58 is connected with a helium storage tank, and opening a valve of the helium storage tank; then the static helium gas charging valve 56 is opened to keep a certain positive pressure; next, the sample rod flange 30 is loosened, the sample rod 29 is pulled upwards, and the sample change is completed, in the process, helium gas is always blown, and impurities such as air and the like cannot be mixed in the sample cavity 17. The sample change process does not require a shut down since the sample chamber 17 operates independently of the circulating helium gas.
With reference to fig. 2, the present embodiment provides an ultra-low vibration tip loading and unloading thermostat device, wherein the damping process of the device mainly comprises 3 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, vibration isolation between the refrigerator and the thermostat cavity is as follows: the refrigerator 1 is mounted on a refrigerator bracket 49, and the refrigerator bracket 49 is supported on an outer frame 51 through a bracket damper 50, so that a part of vibration is reduced; the refrigerator 1 is connected with the upper end 3 of the refrigerator cavity by a refrigerator vibration reduction corrugated pipe 2, so that vibration is further reduced; the refrigerator heat exchanger and the corresponding refrigerator cavity heat exchanger adopt an annular opposite-insertion type structure, heat is transferred through helium or liquid helium, direct contact is avoided, and vibration transfer at a refrigerator cold head is isolated. Secondly, isolating the vibration between the ground and the cavity of the thermostat: the vacuum chamber cylinder 42 is supported on the outer frame 51 through the vacuum chamber cylinder adapter plate 52 and the vacuum chamber damper 53, thereby isolating the influence of the ground vibration on the thermostat chamber. Thirdly, isolating vibration between the sample rod and the cavity of the thermostat: the upper end of the sample rod 29 is provided with a sample rod flange 30, the sample rod flange 30 is connected with a sample rod fixing plate 33 fixed on an air-floating optical platform 59, and the sample rod flange 30 is also connected with the sample cavity 17 through a sample cavity damping corrugated pipe 34, so that the vibration transmission between the sample rod 29 and the cavity of the thermostat and the ground is isolated.
Furthermore, since the vibration of the refrigerator 1 is mainly in the vertical direction, to avoid the generation of cantilever amplified vibration in the horizontal direction: therefore, the balancing weight is adopted 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 cavity shock absorber 53 is adjusted to be consistent with the height of the center of mass, so that the vibration in the horizontal direction is reduced; the balancing weight increases the mass of forced vibration of the device and can reduce the vibration amplitude of the device.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.
Claims (10)
1. The utility model provides an ultralow vibration top loading and unloading type thermostat device, includes refrigerator (1), vacuum cavity, low temperature valve (13), installs sample chamber (17) of sample pole (29), its characterized in that: the refrigerator (1) is arranged on a refrigerator bracket (49), the refrigerator bracket (49) is supported on an outer frame (51) through a bracket shock absorber (50), a refrigerator cavity inserted into the vacuum cavity is connected with the refrigerator (1) through a refrigerator shock absorption corrugated pipe (2), and a heat exchanger of the refrigerator (1) and a heat exchanger of a corresponding refrigerator cavity are in an annular opposite-inserting type structure so as to isolate vibration transmission at a cold head; the upper end of the sample rod (29) is fixed on the air floatation optical platform (59) through a sample rod flange (30), and the sample rod flange (30) is connected with the sample cavity (17) through a sample cavity vibration reduction corrugated pipe (34).
2. The ultra-low vibration top-loading and bottom-loading thermostat device of claim 1, wherein: the vacuum cavity is connected with a vacuum cavity shock absorber (53) arranged on the outer frame (51) through a vacuum cavity barrel adapter plate (52).
3. The ultra-low vibration top-loading thermostat device of claim 1 or 2 wherein: and a first balancing weight (47) and a second balancing weight (48) are arranged on the refrigerator bracket (49) on the inner side of the outer frame (51), and the first balancing weight (47) and the second balancing weight (48) are used for leveling the refrigerator bracket (49) and can increase the forced vibration quality of the device.
4. The ultra-low vibration top-loading and bottom-loading thermostat device of claim 1, wherein: a refrigerator cavity liquid helium outlet (9) at the bottom of the refrigerator cavity is communicated with a low-temperature valve liquid helium inlet (11) at the bottom of a low-temperature valve (13) through a refrigerator liquid helium pipeline (10), the low-temperature valve liquid helium outlet (13) at the bottom end of the low-temperature valve (13) is communicated with a sample cavity liquid helium inlet (20) at the lower part of a sample cavity (17) through a low-temperature valve liquid helium pipeline (16), and a sample cavity circulating helium interface (28) at the upper part of the sample cavity (17) is communicated with a circulating helium gas inlet (55) on the refrigerator (1) through a helium circulating pipe with a circulating pump (54).
5. The ultra-low vibration top-loading and bottom-loading thermostat device of claim 4, wherein: the helium circulating pipe is communicated with an inflation interface (58) which can be communicated with a helium storage tank through a circulating helium inflation pipe with a circulating helium inflation valve (57); the circulating helium gas filling pipe is communicated with a sample cavity static helium gas interface (27) arranged on the sample cavity inner pipe (19) through a static helium gas filling pipe with a static helium gas filling valve (56); the interface of the static helium gas filling pipe and the circulating helium gas filling pipe is positioned between the circulating helium gas filling valve (57) and the gas filling interface (58), and the interface of the circulating helium gas filling pipe and the helium gas circulating pipe is positioned between the circulating pump (54) and the circulating helium gas filling valve (57).
6. The ultra-low vibration top-loading thermostat assembly of any of claims 1, 4, 5 wherein: the sample rod flange (30) is connected with a sample rod fixing plate (33) fixed on an air-floating optical platform (59); a plurality of heat radiation screens (32) which are arranged in parallel are arranged 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 the primary heat radiation screen flange (43) through the sample cavity primary heat sink (25) and the sample cavity secondary heat sink (26) is thermally coupled to the secondary heat radiation screen flange (45).
7. The ultra-low vibration top-loading thermostat assembly of any of claims 1, 4, 5 wherein: the sample cavity (17) comprises a sample cavity outer tube (18), a sample cavity inner tube (19) and a sample cavity bottom barrel (24), the sample cavity bottom barrel (24) is connected with the sample cavity outer tube (18) and the sample cavity inner tube (19) into a whole by welding a sample cavity switching ring (21), a sample rod (29) is suspended in the sample cavity (17), and the tail end of a sample rod body (31) of the sample rod (29) is directly inserted into the middle part of the sample cavity bottom barrel (24); the sample cavity liquid helium inlet (20) positioned on the sample cavity outer pipe (18) is used for communicating an interlayer cavity formed by the low-temperature valve liquid helium pipeline (16), the sample cavity outer pipe (18) and the sample cavity inner pipe (19), a flow limiting hole (22) is arranged in the interlayer cavity at the inlet of the sample cavity liquid helium inlet (20), a sample cavity adapter ring (21) is arranged below the flow limiting hole (22), and a sample cavity heat exchanger (23) connected with a sample cavity bottom cylinder (24) is arranged below the sample cavity adapter ring (21).
8. The ultra-low vibration top-loading and bottom-loading thermostat device of claim 7, wherein: the sample cavity bottom barrel (24) is positioned in the secondary heat radiation screen barrel body (46), a superconducting magnet (35) is arranged on the periphery of the sample cavity bottom barrel (24), the superconducting magnet (35) is suspended in the secondary heat radiation screen barrel body (46) through a magnet suspension rod (36) fixed on a vacuum cavity flange (41), and the superconducting magnet (35) and the sample cavity bottom barrel (24) are concentrically arranged; the superconducting magnet (35) is thermally coupled with the secondary heat radiation screen flange (45) through a magnet cold guide block (60) to realize magnet cooling, and a magnet lead (37) led out from the side surface of the superconducting magnet (35) sequentially passes through the secondary heat radiation screen flange (45) and the primary heat radiation screen flange (43) and is led to a magnet lead penetrating vacuum interface (40) on the vacuum cavity flange (41); the magnet lead (37) is respectively thermally coupled on the secondary heat radiation screen flange (45) through a magnet lead secondary heat sink (39), and the magnet lead primary heat sink (38) is thermally coupled on the primary heat radiation screen flange (43).
9. The ultra-low vibration top-loading and bottom-loading thermostat device of claim 1, wherein: the vacuum cavity consists of a vacuum cavity cylinder (42) and a vacuum cavity flange (41) covered on the vacuum cavity cylinder (42), a primary heat radiation screen cavity body consisting of a primary heat radiation screen flange (43) and a primary heat radiation screen cylinder (44) is arranged in the vacuum cavity, and a secondary heat radiation screen cavity body consisting of a secondary heat radiation screen flange (45) and a secondary heat radiation screen cylinder (46) is arranged in the primary heat radiation screen cavity body; the refrigerator cavity comprises a refrigerator cavity upper section (3) located between a vacuum cavity flange (41) and a primary heat radiation screen flange (43), and a refrigerator cavity lower section (6) located between the primary heat radiation screen flange (43) and a secondary heat radiation screen flange (45), wherein the primary heat radiation screen flange (43) is thermally coupled with a refrigerator cavity primary heat exchanger (5) and a refrigerator cavity secondary heat exchanger (8) on the secondary heat radiation screen flange (45), the refrigerator cavity primary heat exchanger (5) and a refrigerator primary heat exchanger (4) corresponding to the refrigerator cavity primary heat exchanger adopt an annular plug-in type structure configuration without direct contact, and the refrigerator cavity secondary heat exchanger (8) and a refrigerator secondary heat exchanger (7) corresponding to the refrigerator cavity secondary heat exchanger adopt an annular plug-in type structure configuration without direct contact.
10. The ultra-low vibration top-loading thermostat device of claim 1 or 9 wherein: the upper end of the low-temperature valve (13) is fixed on the vacuum cavity flange (41), and the automatic control mechanism of the low-temperature valve (13) is arranged on the vacuum cavity flange (41); the low-temperature valve (13) is in thermal coupling with the primary heat radiation screen flange (43) through the low-temperature valve primary heat sink (14) in sequence, and is in thermal coupling with the secondary heat radiation screen flange (45) through the low-temperature valve secondary heat sink (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110937503.1A CN113533013A (en) | 2021-08-16 | 2021-08-16 | Ultralow vibration top loading and unloading type thermostat device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110937503.1A CN113533013A (en) | 2021-08-16 | 2021-08-16 | Ultralow vibration top loading and unloading type thermostat device |
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| Publication Number | Publication Date |
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| CN113533013A true CN113533013A (en) | 2021-10-22 |
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|---|---|---|---|
| CN202110937503.1A Pending CN113533013A (en) | 2021-08-16 | 2021-08-16 | Ultralow vibration top loading and unloading type thermostat device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554155A (en) * | 2024-01-09 | 2024-02-13 | 北京飞斯科科技有限公司 | Top loading and unloading type low-temperature equipment for electron spin resonance |
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2021
- 2021-08-16 CN CN202110937503.1A patent/CN113533013A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554155A (en) * | 2024-01-09 | 2024-02-13 | 北京飞斯科科技有限公司 | Top loading and unloading type low-temperature equipment for electron spin resonance |
| CN117554155B (en) * | 2024-01-09 | 2024-03-29 | 北京飞斯科科技有限公司 | Top loading and unloading type low-temperature equipment for electron spin resonance |
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