CN103196566B - Elastic structure and implement method of low-temperature thermal coupling between split type dewar and refrigerating machine - Google Patents
Elastic structure and implement method of low-temperature thermal coupling between split type dewar and refrigerating machine Download PDFInfo
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- CN103196566B CN103196566B CN201310098340.8A CN201310098340A CN103196566B CN 103196566 B CN103196566 B CN 103196566B CN 201310098340 A CN201310098340 A CN 201310098340A CN 103196566 B CN103196566 B CN 103196566B
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Abstract
The invention discloses an elastic structure and an implement method for low-temperature thermal coupling between a split type dewar and a refrigerating machine. The elastic structure for the low-temperature thermal coupling between the split type dewar and the refrigerating machine comprises a cold chain seat, a cold cap, a spring, fixed pins and heat conduction silicone grease. The implement method is introduced to the preparation aspect of the elastic structure of the low-temperature thermal coupling between the split type dewar and the refrigerating machine so that the low-temperature thermal coupling between the split type dewar and the refrigerating machine can be achieved. The elastic structure for the low-temperature thermal coupling between the split type dewar and the refrigerating machine is simple in structure, low in cost, and capable of having a function of error compensation of multiple freedom degrees and achieving the high-efficient thermal coupling between the split type dewar and the refrigerating machine. In addition, the elastic structure and an implement method for the low-temperature thermal coupling between the split type dewar and the refrigerating machine are applicable to high-efficient thermal coupling between other passive cold platforms and an initiative refrigeration cold source.
Description
Technical field
The present invention relates to refrigeration type infrared detector Dewar component technology, specifically refer to a kind of elastic construction of being coupled with refrigeration machine Low Temperature Thermal for separated type Dewar and implementation method.
Background technology
Infrared detector dewar assembly has a wide range of applications at infrared regime.Along with wavelength is to long wave expansion and the raising of detection sensitivity, infrared eye could must work under profound hypothermia.Due to mechanical refrigeration there is compact conformation, the advantage such as volume is little, lightweight, refrigerating capacity is large, cooling time is short, cryogenic temperature controlled range is large, such detector mostly adopts mechanical refrigeration mode in the application of space at present.Mostly adopt Dewar to encapsulate when so also making it apply and form refrigeration type infrared detector assembly.
Current refrigeration type infrared detector assembly many employings separated type engineering Dewar first by infrared detector chip encapsulation within it, and then is coupled with refrigeration machine.This implementation tool has the following advantages: (1) Dewar and refrigeration machine can be developed separately, and technique is not intersected, and can shorten the production cycle; (2) between refrigeration machine and engineering Dewar, there is stronger interchangeability; (3) maintenanceability of infrared eye cooling assembly that formed after being coupled with refrigeration machine of separated type Dewar is strong.The cold platform of separated type Dewar and the thermal coupling of refrigeration machine cold finger are reported seldom both at home and abroad.The cold platform of traditional separated type Dewar and thermal coupling many employings indium sheet of refrigeration machine cold finger, carbon paper and low temperature glue.They require all very high to the dimensional accuracy of coupling unit (verticality etc. of the degree of depth of such as stem stem, stem stem and the verticality of cold platform, the length of the cold finger of refrigeration machine, the circumferential body of refrigeration machine and cold junction face cold finger), these all greatly reduce the yield rate of Dewar and refrigeration machine, add the difficulty that the cost of Dewar and refrigeration machine and thermal coupling are assembled.
Summary of the invention
The object of this invention is to provide a kind of elastic construction of being coupled with refrigeration machine Low Temperature Thermal for separated type Dewar and method, solve the cold platform of traditional separated type Dewar and the thermal coupling Problems existing of refrigeration machine cold finger.
As shown in Figure 1, it comprises the elastic construction of Low Temperature Thermal coupling of the present invention: the cold cap 4 of cold chain seat 1, cylindrical spring 2, column type pin 3, column type, heat-conducting silicone grease 5.Wherein spring 2 is placed on round blind hole 103 place of cold chain seat 1, and heat-conducting silicone grease 5 spreads upon the inwall of the round blind hole 402 of cold cap 4, and cold cap 4 is placed in spring 2 upper surface, is coupled together by cold cap 4 by pin 3 with cold chain seat 1.
Described cold chain seat 1 is for selecting oxygenless copper material, and shape, as boss, is made up of upper and lower two cylinders.The bottom surface 101 of cold chain seat 1, its flatness is better than 0.04mm.Its circumference side of upper cylinder 1-2 of cold chain seat 1 leaves waist-shaped hole 102 in advance, has a round blind hole 103 of laying spring 2, the diameter 0.5mm-1mm larger than cylindrical spring 2 overall diameter of round blind hole 103 at upper cylinder 1-2 center simultaneously; Cold chain seat 1 is overall gold-plated, and layer gold thickness is greater than 1 μm, and after gold-plated, in the process of the bottom surface 101 of cold chain seat 1, thickness is the Wood's metal of 0.1mm-0.2mm; As shown in Figure 2, on cold chain seat 1, on cylinder 1-2 upper surface and waist-shaped hole, the distance in face, hole is L1, is 0.5mm-1mm; Waist-shaped hole 102 length of cold chain seat 1 is L2, and defining method is as follows:
the wherein power of Fmax for providing when spring 2 is compressed to extreme position, K is the coefficient of stiffiness of spring 2, and D1 is the diameter of cylindrical pin 3, δ
1for length surplus, choose 0.1mm-0.5mm; Round blind hole 103 bottom surface of cold chain seat 1 and the distance in waist-shaped hole lower opening face are L3, and defining method is as follows:
in formula, Q is will by the transmission cold of this elastic construction, δ
2for the difference of the diameter of blind hole 402 round in the cold cap of column type 4 and the upper cylinder 1-2 outside diameter of cold chain seat 1, for 0.02mm-0.06mm, λ is the Measurement of Low Temperature Thermal Conductivity of heat-conducting silicone grease, Δ T is the temperature difference formed after the certain cold Q of this structural transmission, get 1K-2K, D2 is the diameter of the round blind hole 402 of the cold cap of column type 4, and L1 is the distance in face, hole on cylinder 1-2 upper surface and waist-shaped hole on cold chain seat 1, and L2 is the length of the waist-shaped hole 102 of cold chain seat 1.
Described cylindrical spring 2 adopts carbon spring steel material, and the depth of parallelism of its two cylinder end faces is better than 0.05mm.
Described column type pin 3 adopts oxygenless copper material, and shape is cylindrical, the little 0.5mm-1mm of waist-shaped hole 102 width that its diameter leaves in advance than the upper cylinder 1-2 circumference side of cold chain seat 1.
Oxygenless copper material selected by the cold cap 4 of described column type, and shape is cylindrical, leaves two pin holes 401 in its circumference side, pin hole 401 0.02mm-0.04mm less of column type pin 3 diameter; There is a round blind hole 402 of laying spring 2 at column type cold cap 4 center, its diameter 0.02mm-0.06mm larger than the upper cylinder 1-2 outside diameter of cold chain seat 1 simultaneously; Upper surface 403 flatness of the cold cap 4 of column type is better than 0.04mm, and the surperficial layer gold thickness of the cold cap of column type 4 is greater than 1 μm; The round blind hole 402 of the cold cap of column type 4, its diameter δ larger than the upper cylinder 1-2 outside diameter of cold chain seat 1
2, δ
2choose 0.08mm-0.1mm.
Described heat-conducting silicone grease 5 selects APIEZON-N low temperature heat conduction high vacuum fat, and coefficient of heat conductivity is 0.194W/m DEG C, and this fat can stand-273 DEG C to the thermal shock repeatedly within the scope of 30 DEG C.
The elastic construction assembling process of Low Temperature Thermal coupling of the present invention is as follows:
1) first by cold chain seat 1 acetone, alcohol washes totally, chuck is then used to be fixed;
2) with tweezers, preprepared spring 2 is put into reposefully the round blind hole 103 of cold chain seat 1;
3) heat-conducting silicone grease 5 on the round blind hole 402 inwall uniform application of cold cap 4, then puts down cold cap gently upper surface in spring 2;
4) rotate cold cap 4 gently, the center line of the waist-shaped hole 102 that cylinder 1-2 leaves its circumference side in advance on cold chain seat 1 is alignd with two pin hole center lines of cold cap 4 circumference side;
5) slightly press down upper surface 403 place of cold cap 4, waist-shaped hole 102 is alignd with two pin holes of cold cap 4 circumference side;
6) then two pins 3 are filled in successively in the reserved pin hole 401 of cold cap 4, ensure that two pins are filled in completely, flush with cold cap 4 periphery, this completes this elastic construction assembling process.
Advantage of the present invention is:
1) structure of the present invention is simple, easy to operate, cheap;
2) the present invention has multiple degrees of freedom error compensation function, the difficulty that the cost of minimizing Dewar and refrigeration machine and thermal coupling are assembled;
3) the present invention can test the coupling effect of Dewar and refrigeration machine;
4) High Efficiency Thermal that the present invention is equally applicable between other passive cold platform with active refrigeration low-temperature receivers is coupled.
Accompanying drawing explanation
Fig. 1 is the elasticity cold chain schematic diagram of Low Temperature Thermal coupling;
In figure:
1-cold chain seat;
Cylinder under 1-1 cold chain seat
Cylinder on 1-2 cold chain seat
101-cold chain seat bottom surface
102-waist-shaped hole
103-round blind hole
2-cylindrical spring;
3-column type pin;
The cold cap of 4-column type;
401-pin hole
402-round blind hole
403-cylindrical cold cap upper surface;
5-heat-conducting silicone grease.
Fig. 2 is elastic construction scale diagrams.
Fig. 3 is cold chain seat scale diagrams.
Fig. 4 is cold cap scale diagrams.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.As shown in Figure 1, its main implementation method is as follows:
1, the preparation method of each parts in the present invention:
A) as shown in Fig. 3 (a) He Fig. 3 (b), cold chain seat 1 is for selecting oxygenless copper material, in supersonic cleaning machine, clean 5-10 minute with acetone, alcohol and deionized water successively after processing, remove the grease and the chip that remain in piece surface in processing; Machine rear gold-plated, layer gold thickness is greater than 1 μm; Gold-plated complete after in advance the bottom surface 101 of cold chain seat 1 process on thickness be the Wood's metal of 0.1mm-0.2mm; And use three-coordinates measuring machine to measure 101 place's flatnesses, flatness must be better than 0.04mm; Concrete size is shown in Fig. 3 (a) and Fig. 3 (b), wherein diameter D3=20mm, diameter D4=14mm, diameter D5=8mm;
Wherein L1 gets 0.5mm, Fmax=30N/mm, spring 2 coefficient of stiffiness K=10N/mm, D1=1.5mm, δ
1get 0.1mm, according to formula:
draw L2=4.6mm;
Transmission cold Q gets 1W, and the Measurement of Low Temperature Thermal Conductivity λ of heat-conducting silicone grease gets 0.194W/m DEG C, δ
2choose 0.08mm, temperature difference Δ T=1K, D2=14.08mm, according to formula:
draw L3=4.22mm; L4=2mm, R=1mm, L5=2mm;
B) cylindrical spring 2 adopts carbon spring steel material, and the depth of parallelism of its two cylinder end faces is better than 0.05mm.Cylindrical spring 2 overall diameter is 7.5mm, and upper and lower tolerance is 0.1mm.
C) as shown in Figure 2, column type pin 3 adopts oxygenless copper material, and shape is cylindrical, its diameter D1=1.5mm, and upper tolerance is+0.04mm, and lower tolerance is+0.02mm;
D) oxygenless copper material selected by the cold cap 4 of column type, cleans 5-10 minute successively after processing with acetone, alcohol and deionized water in supersonic cleaning machine, removes the grease and the chip that remain in piece surface in processing; Upper surface 403 flatness using three-coordinates measuring machine to measure the cold cap 4 of column type must be better than 0.04mm, and gold-plated after completing, layer gold thickness is greater than 1 μm; Concrete size is shown in Fig. 4, wherein h1=4mm, D6=20mm, D2=14.08mm, D7=1.5mm, and upper tolerance is-0.04mm, and lower tolerance is-0.02mm;
When being compressed to the limit in order to ensure spring 2, the present invention still has multiple degrees of freedom error compensation function, distance between the upper surface of upper cylinder 1-2 of cold chain seat 1 and the bottom of the round blind hole 402 of cold cap 4 chooses 0.15mm, simultaneously, distance between the upper surface of the lower cylinder 1-1 of cold cap 4 lower surface and cold chain seat 1 chooses 0.15mm, draws thus:
h2＝L3-0.15+D1/2＝4.82mm；
h3＝L1+L2+L3＝9.32mm。
E) heat-conducting silicone grease 5 selects APIEZON-N low temperature heat conduction high vacuum fat, and coefficient of heat conductivity is 0.194W/m DEG C, and this fat can stand-273 DEG C to the thermal shock repeatedly within the scope of 30 DEG C.
2, elastic construction installation step is as follows:
1) first by cold chain seat 1 acetone, alcohol washes totally, chuck is then used to be fixed;
2) with tweezers, preprepared spring 2 is put into reposefully the round blind hole 103 of cold chain seat 1;
3) heat-conducting silicone grease 5 on the round blind hole 402 inwall uniform application of cold cap 4, then puts down cold cap gently upper surface in spring 2;
4) rotate cold cap 4 gently, the center line of the waist-shaped hole 102 that cylinder 1-2 leaves its circumference side in advance on cold chain seat 1 is alignd with two pin hole center lines of cold cap 4 circumference side;
5) slightly press down upper surface 403 place of cold cap 4, waist-shaped hole 102 is alignd with two pin holes of cold cap 4 circumference side;
6) then two pins 3 are filled in successively in the reserved pin hole 401 of cold cap 4, ensure that two pins are filled in completely, flush with cold cap 4 periphery.
7) finally apply certain pressure at cold cap 4 upper surface 403 place, when ensureing that spring 2 is compressed to the limit, the present invention still has multiple degrees of freedom error compensation function.This completes this elastic construction assembling process.
Below just complete this elastic construction assembling process, solve the cold platform of traditional separated type Dewar and the thermal coupling Problems existing of refrigeration machine cold finger.
Claims (3)
1. the elastic construction that is coupled with refrigeration machine Low Temperature Thermal of a separated type Dewar, it comprises: cold chain seat (1), cylindrical spring (2), column type pin (3), the cold cap of column type (4) and heat-conducting silicone grease (5), is characterized in that:
Described cold chain seat (1) selects oxygenless copper material, and shape, as boss, is made up of upper and lower two cylinders; The bottom surface (101) of cold chain seat (1), its flatness is better than 0.04mm; There is waist-shaped hole (102) its circumference side of upper cylinder (1-2) of cold chain seat (1), a round blind hole (103) of laying spring (2) is had, the diameter 0.5mm-1mm larger than cylindrical spring (2) overall diameter of round blind hole (103) at upper cylinder (1-2) center; Cold chain seat (1) is overall gold-plated, and layer gold thickness is greater than 1 μm, and after gold-plated, in bottom surface (101) process of cold chain seat (1), thickness is the Wood's metal of 0.1mm-0.2mm; The distance L1 that cold chain seat (1) goes up face, hole on cylinder (1-2) upper surface and waist-shaped hole is 0.5mm-1mm; Waist-shaped hole (102) the length L2 defining method of cold chain seat (1) is as follows:
Wherein: Fmax is the power that spring (2) can provide when being compressed to extreme position, and K is the coefficient of stiffiness of spring (2), and D1 is the diameter of cylindrical pin (3), δ
1for length surplus, choose 0.1mm-0.5mm;
The defining method of round blind hole (103) bottom surface of cold chain seat (1) and the distance L3 in waist-shaped hole lower opening face is as follows:
In formula, Q is will by the transmission cold of this elastic construction, δ
2for the difference of the diameter of round blind hole (402) in the cold cap of column type (4) and upper cylinder (1-2) outside diameter of cold chain seat (1), value is 0.02mm-0.06mm, λ is the Measurement of Low Temperature Thermal Conductivity of heat-conducting silicone grease, Δ T is the temperature difference formed after the certain cold Q of this structural transmission, value 1K-2K, D2 is the diameter of the round blind hole (402) of the cold cap of column type (4), L1 is the distance that cold chain seat (1) goes up face, hole on cylinder (1-2) upper surface and waist-shaped hole, and L2 is the length of the waist-shaped hole (102) of cold chain seat 1;
Described cylindrical spring (2) adopts carbon spring steel material, and the depth of parallelism of its two cylinder end faces is better than 0.05mm;
Described column type pin (3) adopts oxygenless copper material, the little 0.5mm-1mm of waist-shaped hole (102) width that its diameter leaves in advance than upper cylinder (1-2) the circumference side of cold chain seat (1);
Oxygenless copper material selected by the cold cap of described column type (4), leaves two pin holes (401) in its circumference side, pin hole (401) 0.02mm-0.04mm less of column type pin (3) diameter; There is a round blind hole (402) of laying spring (2) at the cold cap of column type (4) center, its diameter 0.02mm-0.06mm larger than upper cylinder (1-2) outside diameter of cold chain seat (1) simultaneously; Upper surface (403) flatness of the cold cap of column type (4) is better than 0.04mm, and the surperficial layer gold thickness of the cold cap of column type (4) is greater than 1 μm;
Spring (2) is placed in the round blind hole (103) of cold chain seat (1), heat-conducting silicone grease (5) spreads upon the inwall of cold cap (4) round blind hole (402), cold cap (4) is placed in spring (2) upper surface, and two pins (3) are inserted in the reserved pin hole (401) of cold cap (4) and cold chain seat (1) waist-shaped hole (102) that above its circumference side of cylinder (1-2) is left in advance and cold cap (4) and cold chain seat (1) coupled together.
2. the elastic construction that is coupled with refrigeration machine Low Temperature Thermal of a kind of separated type Dewar according to claim 1, is characterized in that: described heat-conducting silicone grease (5) selects APIEZON-N low temperature heat conduction high vacuum fat.
3. the assembly method of elastic construction that is coupled with refrigeration machine Low Temperature Thermal of a kind of separated type Dewar as claimed in claim 1, is characterized in that comprising the following steps:
1) first by cold chain seat (1) acetone, alcohol washes totally, chuck is then used to be fixed;
2) with tweezers, preprepared spring (2) is put into reposefully the round blind hole (103) of cold chain seat (1);
3) heat-conducting silicone grease (5) on round blind hole (402) the inwall uniform application of cold cap (4), then puts down cold cap gently upper surface in spring (2);
4) rotate cold cap (4) gently, the center line of waist-shaped hole (102) that upper its circumference side of cylinder (1-2) of cold chain seat (1) is left in advance aligns with two pin hole center lines of cold cap (4) circumference side;
5) slightly press down upper surface (403) place of cold cap (4), waist-shaped hole (102) is alignd with two pin holes of cold cap (4) circumference side;
6) then two pins (3) are filled in successively in the reserved pin hole (401) of cold cap (4), ensure that two pins are filled in completely, flush with cold cap (4) periphery, this completes this elastic construction assembling process.
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| CN201310098340.8A CN103196566B (en) | 2013-03-26 | 2013-03-26 | Elastic structure and implement method of low-temperature thermal coupling between split type dewar and refrigerating machine |
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| CN103759905B (en) * | 2014-01-17 | 2016-01-13 | 中国科学院上海技术物理研究所 | A kind of at low temperatures to the device of separated type Dewar weld seam pressurization leakage detection |
| CN105180506B (en) * | 2015-09-02 | 2017-06-16 | 中国科学院理化技术研究所 | For the composite refrigeration system and control method of Infrared Detectors |
| CN107121199B (en) * | 2017-07-12 | 2023-06-02 | 中国科学院上海技术物理研究所 | Quick cooling device for ultra-long linear Dewar liquid nitrogen refrigeration and implementation method |
| CN109655165B (en) * | 2019-01-10 | 2020-11-24 | 中国科学院上海技术物理研究所 | Integrated packaging structure for inhibiting noise influence of refrigeration working medium on infrared detector |
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| US5906101A (en) * | 1997-10-30 | 1999-05-25 | University Of Alberta | Dewar flask-compatible storage system and method of use thereof |
| CN101469930B (en) * | 2007-12-28 | 2011-12-07 | 中国航天科技集团公司第五研究院第五一〇研究所 | Composite temperature-variable refrigeration temperature coupling mechanism of liquid nitrogen refrigerating apparatus |
| CN102507012B (en) * | 2011-11-10 | 2013-04-17 | 中国科学院上海技术物理研究所 | Heat load test method and device for split type dewar at different refrigeration temperatures |
| CN203455079U (en) * | 2013-03-26 | 2014-02-26 | 中国科学院上海技术物理研究所 | Elastic structure of low-temperature thermal coupling of split type dewar and refrigerating machine |
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