CN114087317A - Low-temperature cold superconducting vibration isolation device for space low-temperature refrigerator - Google Patents

Low-temperature cold superconducting vibration isolation device for space low-temperature refrigerator Download PDF

Info

Publication number
CN114087317A
CN114087317A CN202111590990.5A CN202111590990A CN114087317A CN 114087317 A CN114087317 A CN 114087317A CN 202111590990 A CN202111590990 A CN 202111590990A CN 114087317 A CN114087317 A CN 114087317A
Authority
CN
China
Prior art keywords
cold
section bar
cover plate
temperature
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111590990.5A
Other languages
Chinese (zh)
Inventor
丁佳奇
曲晶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Geman Technology Co ltd
Original Assignee
Shanghai Geman Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Geman Technology Co ltd filed Critical Shanghai Geman Technology Co ltd
Priority to CN202111590990.5A priority Critical patent/CN114087317A/en
Publication of CN114087317A publication Critical patent/CN114087317A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • F16F15/04—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 using elastic means
    • F16F15/06—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 using elastic means with metal springs
    • F16F15/067—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 using elastic means with metal springs using only wound springs
    • 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
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/041—Wound springs with means for modifying the spring characteristics
    • 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
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/042—Wound springs characterised by the cross-section of the wire
    • 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
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/06—Wound springs with turns lying in cylindrical surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D15/00—Devices not covered by group F25D11/00 or F25D13/00, e.g. non-self-contained movable devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure

Abstract

The invention provides a low-temperature cold superconducting vibration isolation device for a space low-temperature refrigerator, wherein an upper cover plate and a lower cover plate are horizontally arranged and are arranged at intervals up and down, a cold superconducting spring comprises a section bar, the section bar is vertically and spirally arranged and is positioned between the upper cover plate and the lower cover plate and is respectively connected with the upper cover plate and the lower cover plate, a cavity is arranged in the section bar along the length direction of the section bar, the upper end of the section bar is a closed end so as to seal the upper end of the cavity, the lower end of the cavity is exposed out of the lower end of the section bar, one end of a connecting pipeline is connected with the lower end of the section bar and is communicated with the lower end of the cavity, the other end of the connecting pipeline is communicated with an expansion container, a liquid filling pipe is arranged on the expansion container, and a low-temperature cold conducting working medium is filled in the expansion container, the connecting pipeline and the cavity. The invention can effectively isolate the mechanical vibration of the cold head of the low-temperature refrigerator, has the advantages of good cold conduction effect, light weight and small volume, and can effectively solve the problems of cold conduction and mechanical vibration isolation between the cold head of the low-temperature refrigerator and a cooled object.

Description

Low-temperature cold superconducting vibration isolation device for space low-temperature refrigerator
Technical Field
The invention relates to the technical field of vibration isolation devices, in particular to the technical field of low-temperature cold superconducting vibration isolation devices, and particularly relates to a low-temperature cold superconducting vibration isolation device for a space low-temperature refrigerator.
Background
The space low-temperature integrated system has high requirements on refrigerating capacity, stability, service life, anti-interference performance and the like of the refrigerating source. In recent years, under the traction of astronomy, universe, military and other related fields, research institutions such as the united states space agency, the european space agency, the japan space research and development institution, the canadian space agency and the like have individually or cooperatively performed a large number of space detection projects using cryogenic cooling systems, and various technical researches on cryogenic systems have been greatly developed. Common space low-temperature optical system refrigerators include a liquid nitrogen refrigerator, a Stirling refrigerator, a pulse tube refrigerator and the like, and lower temperature regions include a multi-stage Stirling refrigerator, a multi-stage pulse tube refrigerator, a J-T circulation refrigerator, a heat insulation demagnetization refrigerator and the like.
In the integration technology generally applied to the space cryocooler, the cold head of the cryocooler is directly coupled with a cooled object. But the direct coupling mode can transfer the mechanical vibration of the cold head of the cryogenic refrigerator to the cooled object. While cooled objects, such as optical loads, are generally particularly sensitive to mechanical vibrations. Even micro-vibrations of very low magnitude can greatly affect the imaging accuracy.
In order to isolate the mechanical vibration of the cold head of the cryogenic refrigerator, a vibration isolation device is generally arranged between the cold head of the cryogenic refrigerator and a cooled object. The common vibration isolation device is a vibration isolation spring, the cold conduction of the common vibration isolation spring completely depends on the heat conduction of metal, and the cold conduction effect is extremely poor.
The low-temperature channel heat pipe is used as a hot superconductor, and has excellent cold conduction effect. However, the rigid structure of the existing low-temperature heat pipe does not have the vibration isolation effect.
Due to the characteristics of low thermal resistance, long distance, flexible heat transfer and the like, the low-temperature LHP is widely applied to the isolation of cold conduction and mechanical vibration of a space low-temperature refrigerator. However, the cryogenic LHP system is particularly complex and heavy, and is generally applied to scenes where the cold head of the cryogenic refrigerator is far away from the cooled object. If the method is applied to a scene that the cold head of the cryogenic refrigerator is close to the cooled object, a large amount of important resources on the spacecraft are wasted.
Therefore, it is desirable to provide a cryogenic cold superconducting vibration isolation device for a space cryogenic refrigerator, which can effectively isolate the mechanical vibration of the cold head of the cryogenic refrigerator, has the advantages of good cold conduction effect, light weight and small volume, and can effectively solve the problems of cold conduction and mechanical vibration isolation between the cold head of the cryogenic refrigerator and a cooled object.
Disclosure of Invention
In order to overcome the disadvantages in the prior art, an object of the present invention is to provide a cryogenic cold superconducting vibration isolation device for a space cryogenic refrigerator, which can effectively isolate the mechanical vibration of the cold head of the cryogenic refrigerator, has the advantages of good cold conduction effect, light weight and small volume, can effectively solve the problem of cold conduction and mechanical vibration isolation between the cold head of the cryogenic refrigerator and a cooled object, and is suitable for large-scale popularization and application.
The invention also aims to provide the low-temperature cold superconducting vibration isolation device for the space low-temperature refrigerator, which has the advantages of ingenious design, simple structure, simple and convenient manufacture and low manufacturing cost, and is suitable for large-scale popularization and application.
In order to achieve the above purpose, the invention provides a low-temperature cold superconducting vibration isolation device for a space low-temperature refrigerator, which is characterized by comprising an upper cover plate, a lower cover plate, a cold superconducting spring, a connecting pipeline, an expansion container, a liquid charging pipe and a low-temperature cold conducting working medium, wherein:
the upper cover plate and the lower cover plate are horizontally arranged and are arranged at intervals up and down, the cold superconducting spring comprises a section bar, the section bar is vertically spirally arranged and is positioned between the upper cover plate and the lower cover plate and is respectively connected with the upper cover plate and the lower cover plate, a cavity is arranged in the section bar along the length direction of the section bar, the upper end of the section bar is closed by a closed end, the lower end of the cavity is exposed out of the lower end of the section bar, one end of a connecting pipeline is connected with the lower end of the section bar and is communicated with the lower end of the cavity, the other end of the connecting pipeline is communicated with the expansion container, a liquid filling pipe is arranged on the expansion container, and a low-temperature cold-conducting working medium is filled in the expansion container, the connecting pipeline and the cavity.
Preferably, the upper end of the section bar and the lower end of the section bar are respectively embedded in the bottom surface of the upper cover plate and the top surface of the lower cover plate, one end of the connecting pipeline penetrates through the lower cover plate, and the other end of the connecting pipeline penetrates through the side surface of the lower cover plate.
Preferably, the bottom surface of the upper cover plate is provided with an upper groove, the top surface of the lower cover plate is provided with a lower groove, and the upper end of the section bar and the lower end of the section bar are respectively embedded in the upper groove and the lower groove.
Furthermore, the low-temperature cold superconducting vibration isolator for the space low-temperature refrigerator further comprises an upper low-temperature-resistant heat conducting pad and a lower low-temperature-resistant heat conducting pad, wherein the upper low-temperature-resistant heat conducting pad is arranged between the upper groove and the upper end of the section bar and respectively abuts against the upper groove and the upper end of the section bar, and the lower low-temperature-resistant heat conducting pad is arranged between the lower groove and the lower end of the section bar and respectively abuts against the lower groove and the lower end of the section bar.
Preferably, the minimum volume of the expansion vessel is:
Figure BDA0003429906090000031
wherein, Vr,minIs the minimum volume of said expansion vessel; alpha is the filling coefficient of the low-temperature cold-conducting working medium; rhoc,LThe density of the low-temperature cold conduction working medium which is a liquid phase at the lowest cold conduction temperature; vpipeThe total volume of the cavity and the connecting pipeline; rhoc,VThe density of the low-temperature cold conduction working medium is the gas phase at the lowest cold conduction temperature; ρ (P)h,Th) The density of the low-temperature cold conducting working medium of the supercritical gas phase at the highest storage temperature; phIs the highest allowable pressure of the cavity; t ishIs the maximum storage temperature; subscript c represents the minimum conduction temperature; subscript L represents a liquid state; the subscript V represents the gas state.
Preferably, the number of cavities is multiple, and the cavities are arranged at intervals in the transverse direction relative to the section bar.
More preferably, the minimum spacing between two adjacent cavities is:
Figure BDA0003429906090000032
wherein d is the minimum spacing between two adjacent cavities; phIs the highest allowable pressure of the cavity; sdIs the equivalent projected cross-sectional area of the cavity; σ is the yield strength of the profile.
Preferably, the angles of the cross sections of the cavities are less than or equal to 90 degrees.
More preferably, the cross section of the cavity is triangular or quadrangular.
Preferably, the low-temperature cold superconducting vibration isolation device for the space cryogenic refrigerator further comprises a bottom low-temperature-resistant heat conduction pad, and the bottom low-temperature-resistant heat conduction pad is horizontally arranged on the bottom surface of the lower cover plate.
The invention has the beneficial effects that:
1. the upper cover plate and the lower cover plate of the low-temperature cold superconducting vibration isolation device for the space low-temperature refrigerator are horizontally arranged and vertically arranged at intervals, the cold superconducting spring comprises a section bar, the section bar is vertically and spirally arranged and is positioned between the upper cover plate and the lower cover plate and is respectively connected with the upper cover plate and the lower cover plate, a cavity is arranged in the section bar along the length direction of the section bar, the upper end of the section bar is a closed end so as to seal the upper end of the cavity, the lower end of the cavity is exposed out of the lower end of the section bar, one end of a connecting pipeline is connected with the lower end of the section bar and is communicated with the lower end of the cavity, the other end of the connecting pipeline is communicated with an expansion container, a liquid filling pipe is arranged on the expansion container, and a low-temperature cold conducting working medium is filled in the expansion container, the connecting pipeline and the cavity, so that the mechanical vibration of a cold head of the low-temperature refrigerator can be effectively isolated, and the cold conducting working medium between the cold head of the low-temperature refrigerator and an object to be cooled can be effectively isolated from the mechanical vibration The method is suitable for large-scale popularization and application.
2. The upper cover plate and the lower cover plate of the low-temperature cold superconducting vibration isolation device for the space low-temperature refrigerator are horizontally arranged and are vertically arranged at intervals, the cold superconducting spring comprises a section bar, the section bar is vertically and spirally arranged and is positioned between the upper cover plate and the lower cover plate and is respectively connected with the upper cover plate and the lower cover plate, a cavity is arranged in the section bar along the length direction of the section bar, the upper end of the section bar is a closed end so as to seal the upper end of the cavity, the lower end of the cavity is exposed out of the lower end of the section bar, one end of a connecting pipeline is connected with the lower end of the section bar and is communicated with the lower end of the cavity, the other end of the connecting pipeline is communicated with the expansion container, a liquid filling pipe is arranged on the expansion container, and a low-temperature cold conducting working medium is filled in the expansion container, the connecting pipeline and the cavity.
Drawings
Fig. 1 is a perspective view of an embodiment of the cryogenic superconducting vibration isolation device for a space cryogenic refrigerator according to the present invention.
Fig. 2 is a schematic front view of the embodiment shown in fig. 1.
FIG. 3 is a schematic front view of the embodiment shown in FIG. 1 with the upper and lower cover plates removed.
Fig. 4 is a schematic cross-sectional view of the profile of the cold superconducting spring of the embodiment shown in fig. 1.
FIG. 5 is a perspective view of the embodiment shown in FIG. 1 in use.
(symbol description)
1, an upper cover plate; 2, a lower cover plate; 3, a cold superconducting spring; 4 connecting pipelines; 5 expanding the container; 6, filling a liquid pipe; 7, section bar; 8, a cavity; 9, sealing a blind end; 10 filling liquid seal heads; 11 space cryocooler; 12 cold head of low temperature refrigerator.
Detailed Description
In order to clearly understand the technical contents of the present invention, the following examples are given in detail.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 4, in an embodiment of the present invention, a low temperature cold superconducting vibration isolation device for a space cryogenic refrigerator includes an upper cover plate 1, a lower cover plate 2, a cold superconducting spring 3, a connecting pipeline 4, an expansion container 5, a liquid charging pipe 6 and a low temperature cold conducting working medium (not shown), wherein:
the upper cover plate 1 and the lower cover plate 2 are both horizontally arranged and are arranged at intervals up and down, the cold superconducting spring 3 comprises a section bar 7, the section bar 7 is vertically and spirally arranged and positioned between the upper cover plate 1 and the lower cover plate 2 and is respectively connected with the upper cover plate 1 and the lower cover plate 2, a cavity 8 is arranged in the section bar 7 along the length direction of the section bar 7, the upper end of the section bar 7 is a closed end so as to close the upper end of the cavity 8, the lower end of the cavity 8 is exposed out of the lower end of the section bar 7, one end of the connecting pipeline 4 is connected with the lower end of the section bar 7 and communicated with the lower end of the cavity 8, the other end of the connecting pipeline 4 is communicated with the expansion container 5, the liquid charging pipe 6 is arranged on the expansion container 5, the low-temperature cold-conducting working medium is filled in the expansion container 5, the connecting pipeline 4 and the cavity 8.
The upper end of the section bar 7 is a closed end, and any suitable structure may be adopted, as shown in fig. 3, in an embodiment of the present invention, the cold superconducting spring 3 further includes a blind end sealing head 9, and the blind end sealing head 9 is disposed on the upper end of the section bar 7 so as to close the upper end of the section bar 7, so that the upper end of the section bar 7 becomes a closed end.
One end of the connecting pipe 4 is connected to the lower end of the profile 7 and is communicated with the lower end of the cavity 8, and any suitable structure may be adopted, as shown in fig. 3, in a specific embodiment of the present invention, the cold superconducting spring 3 further includes a liquid filling end enclosure 10, the liquid filling end enclosure 10 is disposed on the lower end of the profile 7 and is communicated with the lower end of the cavity 8, one end of the connecting pipe 4 is communicated with the liquid filling end enclosure 10, and the low-temperature cold-conducting working medium is further filled in the liquid filling end enclosure 10.
The section bar 7 is connected with the upper cover plate 1 and the lower cover plate 2 respectively, any suitable structure can be adopted, in a specific embodiment of the invention, the upper end of the section bar 7 and the lower end of the section bar 7 are embedded in the bottom surface of the upper cover plate 1 and the top surface of the lower cover plate 2 respectively, one end of the connecting pipeline 4 is arranged in the lower cover plate 2 in a penetrating manner, and the other end of the connecting pipeline 4 is arranged on the side surface of the lower cover plate 2 in a penetrating manner.
The upper end of the section bar 7 and the lower end of the section bar 7 are respectively embedded in the bottom surface of the upper cover plate 1 and the top surface of the lower cover plate 2, and any suitable structure can be adopted, in a specific embodiment of the present invention, the bottom surface of the upper cover plate 1 is provided with an upper groove (not shown in the figure), the top surface of the lower cover plate 2 is provided with a lower groove (not shown in the figure), and the upper end of the section bar 7 and the lower end of the section bar 7 are respectively embedded in the upper groove and the lower groove.
In an embodiment of the present invention, the low temperature cold superconducting vibration isolator for a space low temperature refrigerator further includes an upper low temperature resistant heat conduction pad (not shown) and a lower low temperature resistant heat conduction pad (not shown), the upper low temperature resistant heat conduction pad is disposed between the upper groove and the upper end of the profile 7 and respectively abuts against the upper groove and the upper end of the profile 7, and the lower low temperature resistant heat conduction pad is disposed between the lower groove and the lower end of the profile 7 and respectively abuts against the lower groove and the lower end of the profile 7. The upper low-temperature-resistant heat conducting pad and the lower low-temperature-resistant heat conducting pad effectively reduce contact heat conduction resistance between the section bar 7 (or the cold superconducting spring 3) and the upper cover plate 1 and the lower cover plate 2.
The upper low temperature-resistant heat conducting pad and the lower low temperature-resistant heat conducting pad can be made of any suitable material, and in a specific embodiment of the invention, the upper low temperature-resistant heat conducting pad and the lower low temperature-resistant heat conducting pad are both low temperature-resistant graphite heat conducting pads.
The number of cavities 8 can be determined as desired, and preferably, the number of cavities 8 is multiple, and a plurality of cavities 8 are arranged at intervals in the transverse direction relative to the profile 7. Referring to fig. 4, in an embodiment of the present invention, the number of the cavities 8 is 21, and preferably, the cavities are divided into 7 rows, each row having 3 cavities.
When the low-temperature cold conducting working medium is stored at normal temperature, the low-temperature cold conducting working medium is usually in a supercritical state. If the supercritical low-temperature cold conducting working medium has no expansion space at normal temperature, the pressure of the cavity 8 is extremely high, and the high pressure of the cavity 8 causes the deformation and even the damage of the cavity 81. Because the low-temperature refrigerator needs to be stored at normal temperature before being started, the expansion container 5 is designed, the maximum allowable pressure of the cavity 8 is calculated according to the highest storage temperature of the cavity 8, and the minimum volume V of the expansion container 5 is obtained according to the structural characteristics of the cavity 8, the lowest cold conduction temperature and the thermal property of the low-temperature cold conduction working mediumr,minComprises the following steps:
Figure BDA0003429906090000061
wherein, Vr,minIs the minimum volume of said expansion vessel 5; alpha is the filling coefficient of the low-temperature cold-conducting working medium; rhoc,LThe density of the low-temperature cold conduction working medium which is a liquid phase at the lowest cold conduction temperature; vpipeThe total volume of the cavity 8 and the connecting line 4; rhoc,VThe density of the low-temperature cold conduction working medium is the gas phase at the lowest cold conduction temperature; ρ (P)h,Th) The density of the low-temperature cold conducting working medium of the supercritical gas phase at the highest storage temperature; phThe highest allowable pressure of said cavity 8; t ishIs the maximum storage temperature; subscript c represents the minimum conduction temperature; subscript L represents a liquid state; the subscript V represents the gas state.
To ensure that the cavities 8 do not deform and break at the highest storage temperature, the spacing between two adjacent cavities 8 needs to be large enough, but if the spacing between two adjacent cavities 8 is larger, the volume of the cavities 8 in the same size of the profile 7 will be smaller and the cooling effect thereof will be worse. In order to ensure that the volume of the cavity 8 is large enough and the maximum allowable pressure of the cavity 8 is satisfied, the minimum interval between two adjacent cavities 8 according to the present invention is:
Figure BDA0003429906090000062
wherein d is the minimum spacing between two adjacent cavities 8; phThe highest allowable pressure of said cavity 8; sdIs the equivalent projected cross-sectional area of the cavity 8; σ is the yield strength of the profile 7.
The cross-section of the cavity 8 may have any suitable configuration, preferably the cross-section of the cavity has an angle of 90 degrees or less. Referring to fig. 4, in one embodiment of the present invention, the cross-section of the cavity 8 has an acute angle of less than ninety degrees.
The cross-section of the cavity 8 may have any suitable shape, and preferably, the cross-section of the cavity 8 is triangular or quadrangular. Referring to fig. 4, in an embodiment of the present invention, the cross section of the cavity 8 is triangular.
The low-temperature cold superconducting vibration isolation device for the space low-temperature refrigerator can also comprise any other suitable components, and in a specific embodiment of the invention, the low-temperature cold superconducting vibration isolation device for the space low-temperature refrigerator further comprises a bottom low-temperature-resistant heat conducting pad (not shown in the figure), and the bottom low-temperature-resistant heat conducting pad is horizontally arranged on the bottom surface of the lower cover plate 2.
The bottom low temperature resistant thermal pad can be any suitable material, and in one embodiment of the invention, the bottom low temperature resistant thermal pad is a low temperature resistant graphite thermal pad.
The section bar 7, the blind end sealing head 9, the liquid filling sealing head 10 and the liquid filling pipe 6 can be made of aluminum alloy with the trade mark of 2A 12T 4. The connecting line 4 and the expansion vessel 5 may be made of stainless steel, 316L. The low-temperature cold conducting working medium can be high-purity nitrogen with the purity of 99.999 percent. The filling coefficient alpha of the low-temperature cold-conducting working medium can be 0.15. The parts of the present invention may be joined by TIG welding or MIG welding unless otherwise specified.
When in use, please refer to fig. 5, the lower cover plate 2 of the present invention is installed on the cryocooler cold head 12 of the space cryocooler 10, for example, the lower cover plate 2 is connected with the cryocooler cold head 12 by a screw connection method, the space cryocooler 10 can be a stirling cryocooler, a pulse tube cryocooler, etc., a bottom low temperature resistant heat conducting pad is padded between the bottom surface of the lower cover plate 2 and the top surface of the cryocooler cold head 12 for reducing the contact heat transfer resistance between the two, and the cooled object is installed on the upper cover plate 1.
When the space cryocooler 10 works, the cryocooler cold head 12 refrigerates, the temperature is reduced, the cold quantity is transmitted to the lower end of the cold superconducting spring 3 through the lower cover plate 2 by means of contact heat conduction, the pressure of the low-temperature cold-conducting working medium in the lower end of the cavity 8 in the cryocooler cold-conducting working medium is reduced, the low-temperature cold-conducting working medium in the expansion container 5 is continuously pumped into the lower end of the cavity 8, after the pressure of the low-temperature cold-conducting working medium in the lower end of the cavity 8 is lower than the critical pressure, the low-temperature cold-conducting working medium in the lower end of the cavity 8 is condensed and liquefied, and the liquefied low-temperature cold-conducting working medium flows to the upper end of the cavity 8 (namely means to flow to the upper end of the cold superconducting spring 3) due to the capillary force formed by the sharp corner of the cavity 8. Because the low-temperature cold conduction working medium in the upper end of the cavity 8 is cooled, the heat capacity of the upper cover plate 1 gasifies and evaporates the returned liquid low-temperature cold conduction working medium, the gaseous low-temperature cold conduction working medium flows to the lower end of the cold superconducting spring 3 through pressure difference, is condensed and liquefied in the lower end of the cavity 8, and changes the cold superconducting spring 3 into a cold superconductor by means of phase change heat transfer of the low-temperature cold conduction working medium, the equivalent heat conductivity coefficient of the cold superconducting spring can reach 100000W/(m.K), and the far-exceeding space common vibration isolation spring has the heat conductivity coefficient of 120W/(m.K).
Compared with the prior art, the invention has the following beneficial effects:
1. compared with a common space vibration isolation spring, the invention can effectively isolate the mechanical vibration between the cold head of the cryogenic refrigerator and the cooled object, and can transmit the cold energy of the space cryogenic refrigerator to the cooled object by using extremely small thermal resistance, and the common space vibration isolation spring is taken as an example, the spring is made of aluminum alloy, the section size is 3mm x 5mm, the expansion length of the spring is 300mm, the thermal resistance of the invention is 0.2K/W, and the common space vibration isolation spring can reach 100K/W.
2. Compared with a low-temperature heat pipe, the invention can effectively isolate the mechanical vibration between the cold head of the low-temperature refrigerator and the cooled object.
3. Compared with low-temperature LHP, the invention has the advantages of simple structure, light weight, high reliability and the like, especially in the aspect of short-distance cold conduction, the weight of the invention is only 300g by taking 20W cold transferred by a 120K temperature zone as an example, and the weight of the low-temperature LHP is 3000g at least.
Therefore, the invention realizes cold superconduction by utilizing the phase change heat transfer of the filling working medium and realizes the low-pressure storage of the device by utilizing the expansion container with the accurately calculated volume. The invention can effectively isolate the mechanical vibration of the refrigerator, has the advantages of good cold conduction effect, light weight, small volume and the like, and can effectively solve the problems of cold conduction and mechanical vibration isolation between the cold head of the low-temperature refrigerator of the space low-temperature refrigerator and a cooled object.
In conclusion, the low-temperature cold superconducting vibration isolation device for the space low-temperature refrigerator can effectively isolate the mechanical vibration of the cold head of the low-temperature refrigerator, has the advantages of good cold conducting effect, light weight and small volume, can effectively solve the problem of cold conducting and mechanical vibration isolation between the cold head of the low-temperature refrigerator and a cooled object, and is ingenious in design, simple in structure, simple and convenient to manufacture, low in manufacturing cost and suitable for large-scale popularization and application.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims (10)

1. The utility model provides a space cryogenic refrigeration machine is with cold superconductive vibration isolation device of low temperature which characterized in that, leads cold working medium including upper cover plate, lower apron, cold superconductive spring, connecting line, expansion vessel, liquid charging pipe and low temperature, wherein:
the upper cover plate and the lower cover plate are horizontally arranged and are arranged at intervals up and down, the cold superconducting spring comprises a section bar, the section bar is vertically spirally arranged and is positioned between the upper cover plate and the lower cover plate and is respectively connected with the upper cover plate and the lower cover plate, a cavity is arranged in the section bar along the length direction of the section bar, the upper end of the section bar is closed by a closed end, the lower end of the cavity is exposed out of the lower end of the section bar, one end of a connecting pipeline is connected with the lower end of the section bar and is communicated with the lower end of the cavity, the other end of the connecting pipeline is communicated with the expansion container, a liquid filling pipe is arranged on the expansion container, and a low-temperature cold-conducting working medium is filled in the expansion container, the connecting pipeline and the cavity.
2. The cryogenic cold superconducting vibration isolator for the space cryogenic refrigerator according to claim 1, wherein the upper end of the section bar and the lower end of the section bar are respectively embedded in the bottom surface of the upper cover plate and the top surface of the lower cover plate, one end of the connecting pipeline penetrates through the lower cover plate, and the other end of the connecting pipeline penetrates through the side surface of the lower cover plate.
3. A cryogenic cold superconducting vibration isolator for a space cryogenic refrigerator according to claim 2, wherein the bottom surface of the upper cover plate is provided with an upper groove, the top surface of the lower cover plate is provided with a lower groove, and the upper end of the section bar and the lower end of the section bar are respectively embedded in the upper groove and the lower groove.
4. The cryogenic cold superconducting vibration isolator for the space cryogenic refrigerator according to claim 3, further comprising an upper cryogenic heat-conducting pad and a lower cryogenic heat-conducting pad, wherein the upper cryogenic heat-conducting pad is disposed between the upper groove and the upper end of the section bar and respectively abuts against the upper groove and the upper end of the section bar, and the lower cryogenic heat-conducting pad is disposed between the lower groove and the lower end of the section bar and respectively abuts against the lower groove and the lower end of the section bar.
5. The cryogenic cold superconducting vibration isolation device for the space cryogenic refrigerator according to claim 1, wherein the minimum volume of the expansion vessel is:
Figure FDA0003429906080000011
wherein, Vr,minIs the minimum volume of said expansion vessel; alpha is the filling coefficient of the low-temperature cold-conducting working medium; rhoc,LThe density of the low-temperature cold conduction working medium which is a liquid phase at the lowest cold conduction temperature; vpipeThe total volume of the cavity and the connecting pipeline; rhoc,VThe density of the low-temperature cold conduction working medium is the gas phase at the lowest cold conduction temperature; ρ (P)h,Th) The density of the low-temperature cold conducting working medium of the supercritical gas phase at the highest storage temperature; phIs the highest allowable pressure of the cavity; t ishIs the maximum storage temperature; subscript c represents the minimum conduction temperature; subscript L represents a liquid state; the subscript V represents the gas state.
6. The cryogenic cold superconducting vibration isolator for a space cryogenic refrigerator according to claim 1, wherein the number of the cavities is plural, and the plural cavities are arranged at a distance from each other in a transverse direction with respect to the profile.
7. The cryogenic cold superconducting vibration isolation device for the space cryogenic refrigerator according to claim 6, wherein the minimum interval between two adjacent cavities is:
Figure FDA0003429906080000021
wherein d is the minimum spacing between two adjacent cavities; phIs the highest allowable pressure of the cavity; sdIs the equivalent projected cross-sectional area of the cavity; σ is the yield strength of the profile.
8. The cryogenic cold superconducting vibration isolation device for the space cryogenic refrigerator according to claim 1, wherein the cross section of the cavity has an angle of 90 degrees or less.
9. The cryogenic cold superconducting vibration isolator for the space cryogenic refrigerator according to claim 8, wherein the cross section of the cavity is triangular or quadrangular.
10. The cryogenic cold superconducting vibration isolator for the space cryogenic refrigerator according to claim 1, further comprising a bottom cryogenic heat-resistant pad horizontally disposed on the bottom surface of the lower cover plate.
CN202111590990.5A 2021-12-23 2021-12-23 Low-temperature cold superconducting vibration isolation device for space low-temperature refrigerator Pending CN114087317A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111590990.5A CN114087317A (en) 2021-12-23 2021-12-23 Low-temperature cold superconducting vibration isolation device for space low-temperature refrigerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111590990.5A CN114087317A (en) 2021-12-23 2021-12-23 Low-temperature cold superconducting vibration isolation device for space low-temperature refrigerator

Publications (1)

Publication Number Publication Date
CN114087317A true CN114087317A (en) 2022-02-25

Family

ID=80307781

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111590990.5A Pending CN114087317A (en) 2021-12-23 2021-12-23 Low-temperature cold superconducting vibration isolation device for space low-temperature refrigerator

Country Status (1)

Country Link
CN (1) CN114087317A (en)

Similar Documents

Publication Publication Date Title
US4796433A (en) Remote recondenser with intermediate temperature heat sink
US8671698B2 (en) Gas liquifier
US5461873A (en) Means and apparatus for convectively cooling a superconducting magnet
US5107683A (en) Multistage pulse tube cooler
Marquardt et al. A pulse tube oxygen liquefier
CN113053615B (en) Helium microcirculation refrigeration Dewar system for superconducting magnet
US7131276B2 (en) Pulse tube refrigerator
JP2001510551A (en) Current supply for cooling electrical equipment
JPH0743178B2 (en) Two-stage thermal coupling
CN100416880C (en) Multi-stage refrigeration of high-temp. superconducting
CN114322349A (en) Low-temperature storage system cooled by regenerative refrigerator coupled with direct current
CN114087317A (en) Low-temperature cold superconducting vibration isolation device for space low-temperature refrigerator
CN2767942Y (en) Low-temperature loop heat pipe for deep low temperature area
CN216430385U (en) Low-temperature cold superconducting vibration isolation device for space low-temperature refrigerator
CN115751189A (en) Comprehensive heat management system and method based on deep supercooling low-temperature propellant
CN216897891U (en) Low-temperature storage system cooled by regenerative refrigerator coupled with direct current
CN213483505U (en) Refrigerant cooling system for superconducting magnet
CN109525069A (en) A kind of high-temperature superconducting motor rotor low-temperature cooling system
CN115420056A (en) Low-temperature system for space low-temperature superconducting cavity
KR100633223B1 (en) Cryogenic refrigerators having dividing means
Hosoyama et al. Development of a high performance transfer line system
Leupold et al. Subcooled superfluid helium cryostat for a hybrid magnet system
Hakuraku et al. Thermal design and tests of a subcooled superfluid helium refrigerator
CN2788114Y (en) Gravity aided cryogenic loop heat pipe for deep cryogenic region
JP3465195B2 (en) Cryopump

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination