CN109386981B - Cold shrink resistant device for integrated coupling of straight line vascular cold finger and Dewar - Google Patents
Cold shrink resistant device for integrated coupling of straight line vascular cold finger and Dewar Download PDFInfo
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- CN109386981B CN109386981B CN201811387876.0A CN201811387876A CN109386981B CN 109386981 B CN109386981 B CN 109386981B CN 201811387876 A CN201811387876 A CN 201811387876A CN 109386981 B CN109386981 B CN 109386981B
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- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
- F25B9/145—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle pulse-tube cycle
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Abstract
The invention discloses a cold shrink resistant device for coupling a straight-line vascular cold finger with a Dewar, which comprises the straight-line vascular cold finger, a cold accumulator hot end flange, a vascular hot end flexible flange and a Dewar cold box. The cold head of the straight-line vascular cold finger is connected with the cold platform of the Dewar cold box through a flexible cold chain, and the cold end flange of the cold accumulator is welded with one side of the Dewar cold box and the vascular flexible flange is welded with the other side of the Dewar cold box. The linear pulse tube refrigerator obtains a low-leakage-rate high-vacuum environment of the Dewar cold box through welding the two flanges and the Dewar cold box; the flexible flange at the hot end of the vessel has certain flexibility in the axial direction of the linear vessel, and cold shrinkage occurs when the cold finger of the linear vessel is cooled, so that the flexible flange at the hot end of the vessel can correspondingly deform axially, the cold shrinkage stress of the cold finger of the linear vessel is reduced, and the high reliability of sealing the cold finger of the vessel and the Dewar cold box is ensured. The invention has the advantages of simple structure and easy processing and realization, and is beneficial to improving the reliability of the coupling of the straight-line vascular cold finger and the Dewar cold box.
Description
Technical field:
the invention belongs to the field of space remote sensing, and particularly relates to a cold shrink resistant device for integrated coupling of a straight line vascular cold finger and a Dewar.
The background technology is as follows:
the pulse tube refrigerator is a novel regenerative low-temperature refrigerator, is proposed in the 60 th century of 20 th and rapidly developed in the middle of the 80 th, and is widely applied to the aerospace, superconducting industry, low-temperature electronics, low-temperature medicine and other aspects. It eliminates the cold end ejector widely used in Stirling or G-M refrigerators and replaces it with a completely passive hollow tube (pulse tube); the phase difference between pressure wave and mass flow required by refrigeration is realized through the operation of a hot end phase modulation mechanism (such as a small hole, an air reservoir, a fine tuning valve, a nozzle, an inertia tube and the like). The method completely eliminates the moving parts of the cold end, and realizes low vibration, low interference and no abrasion of the cold end. Pulse tube refrigerators are classified into three main categories, i.e., U-shaped, coaxial type and linear type, according to the spatial geometrical arrangement of the pulse tube and regenerator. Compared with U-shaped and coaxial pulse tubes, the linear pulse tube cold accumulator and the pulse tube are positioned on the same straight line, so that the flow resistance of a cold head is furthest reduced, the air flow does not need to be turned back at the cold end, the dead volume caused by turning back the air flow is avoided, the air flow at the cold end is also disturbed minimally, the efficiency is highest, and in the field of space application, the linear pulse tube refrigerator is applied to the space, because the power limitation has high requirements on the efficiency of the refrigerator, and the linear pulse tube refrigerator has important application in the field of aerospace.
The pulse tube cold accumulator of the linear pulse tube refrigerator is positioned on the same straight line with the pulse tube, the cold head is positioned in the middle, and the hot end is positioned at two ends. The low leakage rate high vacuum environment of the Dewar cold box is obtained by welding the two flanges and the Dewar cold box at the two hot ends, but cold finger will shrink when the linear vessel is cooled, so that the interface leakage problem and the cold finger deformation even fracture problem exist at the interface of the vessel hot end and the Dewar cold box flange due to cold shrink stress. The flange structure at the interface of the vascular hot end and the Dewar cold box is required to be optimized, so that various problems caused by cold shrinkage stress are solved.
The invention comprises the following steps:
the invention aims to provide a cold-shrink resistant device for integrated coupling of a straight-line vascular cold finger and a Dewar, which has a simple structure and is easy to process and realize, and solves the problem of stress generated by cold shrinkage of the cold finger when the existing straight-line vascular cold finger and the Dewar are integrated and coupled for cooling.
The invention relates to a cold shrink resistant device integrally coupled with a Dewar, which comprises a Dewar cold box shell 1, a cold platform 2, a cold chain 3, an air reservoir 4, an inertia tube 5, a pulse tube hot end heat exchanger 6, a pulse tube hot end flexible flange 7, a pulse tube 8, a cold head (a pulse tube cold end) 8-1, a pulse tube cold accumulator 9, a cold accumulator hot end flange 10, a cold accumulator hot end 11 and a compressor 12; wherein:
the pulse tube refrigerator adopts a straight pulse tube, the pulse tube regenerator 9 and the pulse tube 8 are positioned on the same straight line, the cold head 8-1 is positioned in the middle, and the pulse tube hot end heat exchanger 6 and the regenerator hot end 11 are positioned at two sides. Cold head 8-1 of pulse tube 8 is connected to cold stage 2 within dewar cabinet housing 1 by flexible cold chain 3. The pulse tube refrigerator provides cold for the Dewar cold box cold platform 2 to obtain constant low temperature, and vacuum is needed in the Dewar during ground test. The linear pulse tube refrigerator is welded with the Dewar cold box shell 1 through the pulse tube hot end flexible flange 7 and the cold accumulator hot end flange 10 to obtain a low leakage rate high vacuum environment of the Dewar cold box. In order to reduce cold shrinkage stress generated when the pulse tube 8 is cooled, a high vacuum environment of the Dewar cold box is ensured, the flexible flange 7 at the hot end of the pulse tube is manufactured into a flexible flange, when cold shrinkage occurs to a pulse tube cold finger material in the cooling process, a diaphragm with a circumferential corrugated structure in the flexible flange is deformed, and the expansion and contraction changes of the cold finger are brought by the absorption temperature changes, so that the cold shrinkage stress born by the cold finger is reduced, and the sealing performance is enhanced.
The pulse tube is a linear pulse tube, the cold accumulator and the pulse tube are positioned on the same straight line, the air flow does not need to turn back at the cold end, the flow resistance of the cold head is furthest reduced, the disturbance to the air flow at the cold end is minimum, and the efficiency is highest.
The flexible flange at the hot end of the pulse tube is characterized in that a circumferential corrugated structure is added on a flange diaphragm, and the thickness of the diaphragm is 0.3-0.5 mm.
The invention has the advantages that: the invention has the advantages that the flexible flange at the hot end of the vessel is simple in structure and easy to process and realize when the linear vessel cold finger is integrally coupled with the Dewar, and can deform due to certain flexibility in the axial direction, thereby effectively reducing cold shrinkage stress of the linear vessel cold finger and being beneficial to improving the coupling reliability of the linear vessel cold finger and the Dewar cold box.
Description of the drawings:
FIG. 1 is a schematic illustration of a cold shrink resistant device integrally coupled to a dewar with a straight vessel cold finger;
in the figure: 1. a Dewar cold box housing; 2. a cold platform; 3. a cold chain; 4. an air reservoir; 5. an inertial tube; 6. a pulse tube hot side heat exchanger; 7. a flexible flange at the hot end of the pulse tube; 8. a pulse tube; 8-1, cold head; 9. vascular regenerator; 10. a cold accumulator hot end flange; 11. a cold accumulator hot end; 12. compressor with a compressor body having a rotor with a rotor shaft
FIG. 2 is a schematic diagram of a cold shrink resistant flange integrally coupled to a Dewar for a straight vessel cold finger;
in the figure: 7-1, a flange diaphragm; 7-2, flanges; 7-3, corrugated structure
FIG. 3 is a schematic illustration of a cold shrink resistant device integrally coupled to a dewar with a straight vessel cold finger;
wherein: the graph a is the normal temperature state of the diaphragm, and the graph b is the low temperature state of the diaphragm.
The specific embodiment is as follows:
the invention is further described below with reference to the drawings and examples.
As shown in fig. 1, the invention provides a cold shrink resistant device integrally coupled with a Dewar by a straight pulse tube cold finger, which comprises a Dewar cold box shell 1, a cold platform 2, a cold chain 3, a gas reservoir 4, an inertia tube 5, a pulse tube hot end heat exchanger 6, a pulse tube hot end flexible flange 7, a pulse tube 8, a cold head 8-1, a pulse tube cold accumulator 9, a cold accumulator hot end flange 10, a cold accumulator hot end 11 and a compressor 12.
The pulse tube refrigerator adopts a straight pulse tube, the pulse tube regenerator 9 and the pulse tube 8 are positioned on the same straight line, the middle of the cold head 8-1, and the pulse tube hot end heat exchanger 6 and the regenerator hot end 11 are positioned on two sides. Cold head 8-1 of pulse tube 8 is connected to cold stage 2 of the dewar cold box by flexible cold chain 3. The pulse tube refrigerator provides cold for the cold platform 2 in the Dewar cold box shell 1 to obtain constant low temperature, and the Dewar is used for packaging. The linear pulse tube refrigerator is welded with the Dewar cold box shell 1 through the pulse tube hot end flexible flange 7 and the cold accumulator hot end flange 10 to obtain a low leakage rate high vacuum environment of the Dewar cold box. In order to reduce cold shrinkage stress generated when the cold finger is cooled, a high vacuum environment of the Dewar cold box is ensured, the flexible flange 7 at the hot end of the pulse tube is manufactured into a flexible flange, and when cold shrinkage occurs in a pulse tube cold finger material in the cooling process, the heat expansion and cold shrinkage changes of the cold finger are brought by the absorption temperature changes, so that the cold shrinkage stress born by the cold finger is reduced, and the coupling sealing performance of the pulse tube and the Dewar cold box is enhanced.
As shown in FIG. 2, the invention relates to a cold-shrink resistant flange for integrated coupling of a straight-line vascular cold finger and a Dewar, wherein a flexible flange 7 at the hot end of a pulse tube is manufactured into a flexible flange, and a flange 7-2 with a circumferential corrugated structure 7-3 in a flexible flange membrane 7-1 is deformed so as to reduce cold-shrink stress born by the cold finger.
As shown in figure 3, the invention relates to a cold-shrink-resistant flange with integrated coupling of a linear vascular cold finger and a Dewar cold box, which is compared with a normal temperature structure a and a low temperature deformation structure b, wherein a diaphragm deforms under the action of stress at low temperature, a protruding part of the diaphragm provides a space for deformation displacement, and good sealing between the vascular cold box and the Dewar cold box can be ensured after the diaphragm deforms
Finally, it should be noted that: it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A cold shrink resistant device integrally coupled with a Dewar cold finger comprises a Dewar cold box shell (1), a cold platform (2), a cold chain (3), an air reservoir (4), an inertia tube (5), a pulse tube hot end heat exchanger (6), a pulse tube hot end flexible flange (7), a pulse tube (8), a cold head (8-1), a pulse tube cold accumulator (9), a cold accumulator hot end flange (10), a cold accumulator hot end (11) and a compressor (12); the method is characterized in that:
the pulse tube hot-end heat exchanger (6) is sequentially connected with the pulse tube (8), the cold head (8-1), the pulse tube regenerator (9), the regenerator hot-end flange (10) and the regenerator hot end (11) in a welding mode, the regenerator hot-end flange (10) of the linear pulse tube is welded with one side of the Dewar cold box shell (1), and the pulse tube hot-end flexible flange (7) of the linear pulse tube is welded with the other side of the Dewar cold box shell (1); the cold head (8-1) of the pulse tube (8) is flexibly connected with a cold platform in the Dewar cold box shell (1) through a flexible cold chain (3); the cold accumulator hot end (11) of the straight line vessel is rigidly connected with the Dewar cold box shell (1).
2. The linear vascular cold finger and dewar integrated coupling cold shrink resistant device of claim 1 wherein: the material of the flexible flange (7) at the hot end of the pulse tube is stainless steel, and a corrugated structure exists at the circumference of the flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811387876.0A CN109386981B (en) | 2018-11-21 | 2018-11-21 | Cold shrink resistant device for integrated coupling of straight line vascular cold finger and Dewar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811387876.0A CN109386981B (en) | 2018-11-21 | 2018-11-21 | Cold shrink resistant device for integrated coupling of straight line vascular cold finger and Dewar |
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| Publication Number | Publication Date |
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| CN109386981A CN109386981A (en) | 2019-02-26 |
| CN109386981B true CN109386981B (en) | 2023-07-04 |
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| CN201811387876.0A Active CN109386981B (en) | 2018-11-21 | 2018-11-21 | Cold shrink resistant device for integrated coupling of straight line vascular cold finger and Dewar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109945542A (en) * | 2019-03-29 | 2019-06-28 | 中国科学院上海技术物理研究所 | A kind of resistance to stress linear type vascular refrigerator and Dewar coupled structure |
Citations (8)
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|---|---|---|---|---|
| JPH06281497A (en) * | 1993-01-29 | 1994-10-07 | Mitsubishi Electric Corp | Infrared ray detector |
| CN1467461A (en) * | 2002-07-09 | 2004-01-14 | 中国科学院理化技术研究所 | Nonmagnetic low-vibration coaxial impulse pipe refrigerating machine |
| CN103344061A (en) * | 2013-06-21 | 2013-10-09 | 中国科学院上海技术物理研究所 | Coupling structure between linear type pulse tube refrigerator and infrared device and manufacturing method for same |
| CN203771765U (en) * | 2014-01-17 | 2014-08-13 | 中国科学院上海技术物理研究所 | Compact coupled inertia tube type high-frequency coaxial pulse tube refrigerating machine |
| CN104535344A (en) * | 2014-12-09 | 2015-04-22 | 中国科学院上海技术物理研究所 | Standard Duvel for measuring refrigeration performance of linear type pulse tube refrigerating machines and manufacturing method |
| CN107270571A (en) * | 2017-06-21 | 2017-10-20 | 浙江大学 | A kind of acoustic pressure amplifying device and refrigeration machine loaded based on RC |
| CN108317764A (en) * | 2017-12-29 | 2018-07-24 | 浙江大学 | A kind of vascular refrigerator equipped with adjustable bellows formula inertia tube |
| CN209445626U (en) * | 2018-11-21 | 2019-09-27 | 中国科学院上海技术物理研究所 | Straight line vascular cold finger integrates the anti-cold-shrinkage device coupled with Dewar |
-
2018
- 2018-11-21 CN CN201811387876.0A patent/CN109386981B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06281497A (en) * | 1993-01-29 | 1994-10-07 | Mitsubishi Electric Corp | Infrared ray detector |
| CN1467461A (en) * | 2002-07-09 | 2004-01-14 | 中国科学院理化技术研究所 | Nonmagnetic low-vibration coaxial impulse pipe refrigerating machine |
| CN103344061A (en) * | 2013-06-21 | 2013-10-09 | 中国科学院上海技术物理研究所 | Coupling structure between linear type pulse tube refrigerator and infrared device and manufacturing method for same |
| CN203771765U (en) * | 2014-01-17 | 2014-08-13 | 中国科学院上海技术物理研究所 | Compact coupled inertia tube type high-frequency coaxial pulse tube refrigerating machine |
| CN104535344A (en) * | 2014-12-09 | 2015-04-22 | 中国科学院上海技术物理研究所 | Standard Duvel for measuring refrigeration performance of linear type pulse tube refrigerating machines and manufacturing method |
| CN107270571A (en) * | 2017-06-21 | 2017-10-20 | 浙江大学 | A kind of acoustic pressure amplifying device and refrigeration machine loaded based on RC |
| CN108317764A (en) * | 2017-12-29 | 2018-07-24 | 浙江大学 | A kind of vascular refrigerator equipped with adjustable bellows formula inertia tube |
| CN209445626U (en) * | 2018-11-21 | 2019-09-27 | 中国科学院上海技术物理研究所 | Straight line vascular cold finger integrates the anti-cold-shrinkage device coupled with Dewar |
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