CN203190705U - Composite multistage pulse tube refrigerator working under temperature span of 1-2K - Google Patents
Composite multistage pulse tube refrigerator working under temperature span of 1-2K Download PDFInfo
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- CN203190705U CN203190705U CN 201320026569 CN201320026569U CN203190705U CN 203190705 U CN203190705 U CN 203190705U CN 201320026569 CN201320026569 CN 201320026569 CN 201320026569 U CN201320026569 U CN 201320026569U CN 203190705 U CN203190705 U CN 203190705U
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Abstract
The utility model discloses a composite multistage pulse tube refrigerator working in a temperature span of 1-2K. The composite multistage pulse tube refrigerator comprises a pre-cooling-stage low-frequency pulse tube refrigerator using helium-4 as a working medium and a low-temperature-stage high-frequency pulse tube refrigerator using helium-3 as a working medium. Through coupling of the high-frequency pulse tube refrigerator and the low-frequency pulse tube refrigerator, the composite multistage pulse tube refrigerator can acquire a refrigeration temperature of 1-2K under the condition of using less helium-3. Compared with a traditional two-stage low-frequency pulse tube refrigerator using helium-3 as a working medium, the composite multistage pulse tube refrigerator can reduce the usage amount of helium-3 gas greatly and has the advantages of being low in cost, convenient to obtain, compact in structure, long in service life and high in reliability.
Description
Technical field
The utility model relates to a kind of compound multistage vascular refrigerator, relates in particular to a kind of helium-4 and helium-3 of using simultaneously and is the compound multistage vascular refrigerator of the low-and high-frequency that is operated in the 1-2K warm area of working medium.
Background technology
Low-temperature refrigeration technology has extensive and irreplaceable application in fields such as basic scientific research, low-temperature physics, commercial Application, medical biotechnology, national defense and military and space explorations, the scientific domain relevant with low temperature become core or high-tech representative at present, as large-scale science devices such as European hadron colliders.Arrange according to the world, low-temperature refrigeration technology is contained the following temperature province of 120K, the refrigeration modes of current whole low temperature warm area is ripe relatively, 1K and above warm area can adopt superfluid helium, liquid helium or other cryogenic liquid Dewar technology and mechanical type Refrigeration Technique to obtain, and 1K has technology such as adiabatic demagnetization refrigeration and dilution refrigeration with next.
In the low temperature warm area, 1-2K is a very crucial and special warm area, have a large amount of detector (mixing the gallium detector as germanium) and superconducting apparatus to be operated in this warm area on the one hand, the efficient acquisition of lower mK level warm area must be cooled off in advance at this warm area on the other hand.The refrigeration modes of current acquisition 1-2K warm area mainly contains superfluid helium find time technology and mechanical type Refrigeration Technique.
The superfluid helium a large amount of liquid helium of Technology Need of finding time, for guaranteeing the thermal insulation of system, system structure design is complicated unusually, simultaneously for guaranteeing the efficient utilization of helium, need to be equipped with complicated helium recovery and purification system, these all cause the superfluid helium technical costs height of finding time, and system architecture complexity and reliability are low.
The mechanical type Refrigeration Technique adopts the enclosed kind of refrigeration cycle to realize refrigeration effect, and refrigeration working medium (low temperature is generally helium) circulates in closed system, and it is few to have a helium consumption, compact conformation, long and reliability advantages of higher of life-span.Because the maximum helium exported country U.S. in the whole world exports restriction with helium as strategic materials, current global liquid helium supply day is becoming tight, and cost increases day by day, so the mechanical type refrigeration modes has obtained fast development and extensive use.
The mechanical type Refrigeration Technique mainly contains regenerative refrigerating technology and dividing wall type Refrigeration Technique, wherein the regenerative refrigerating technology is owing to adopted the efficient regenerator that is filled with high volumetric specific heat capacity backheat filler, have compact conformation efficient advantages of higher, obtained in fields such as low-temperature physics, military and national defense, Aero-Space using widely.Vascular refrigerator, GM refrigeration machine and sterlin refrigerator are three kinds of typical philip refrigerators, wherein vascular refrigerator does not have moving component at cold junction, has potential high reliability, and show according to existing open source literature data, only be the cryogenic temperature of the low frequency vascular refrigerator acquisition 1-2K of working medium with helium-3 in the current regenerative refrigerating technology, but it needs a large amount of helium-3, (Jiang N such as Jiang Ning, et al.Cryogenics, 2004,44:809.) adopt two-stage low frequency vascular refrigerator to obtain the lowest refrigerating temperature of 1.27K, but use the helium-3228 liter under the standard state altogether.
Helium-the 3rd, a kind of in the helium isotope, its content at occurring in nature is few, and only containing volume fraction in the normal helium is 1.3 * 10
-6The helium of %-3, be a kind of gas of rare costliness, the leading exporter U.S. of helium-3 has put into effect the relevant policies of restriction helium outlet in addition simultaneously, cause the substantial appreciation of prices of helium-3 in recent years, helium-3 rises from about 200 dollars/mark in 2007, rise to 2000 dollars/mark liter in 2009, the price of current helium-3 is about 10000 dollars/mark and rises, and expensive source simultaneously is difficult for acquisition.The Science magazine was delivered and is entitled as " helium-3 shortage makes the matter worse the low temperature correlative study " (Helium-3Shortage Could Put Freeze On Low-Temperature Research in 2009, A.Cho.Science, 2009, Vol.306:778-779.) comment, article has been analyzed current helium-3 meeting in short supply and has been brought significantly and seriously influence to fields such as low-temperature physics, based on above-mentioned analysis as can be known, excavate novel not using helium-3 or use the 1-2K warm area Refrigeration Technique of helium-3 to the fast development of propelling low temperature related science research as far as possible less, it is most important to the influence of global association area to alleviate helium-3 shortage, so be badly in need of 1-2K warm area Refrigeration Technique novel and that have higher feasibility.
The utility model content
The utility model provides the compound multistage vascular refrigerator of a kind of 1-2K of being operated in, and the coupling by different refrigeration modes can obtain the cryogenic temperature of 1-2K under the prerequisite of using very a small amount of helium-3, compact conformation simultaneously, reliability height.
The correlation theory of vascular refrigerator points out to improve the volume that running frequency can significantly reduce refrigeration system, so improve the consumption that running frequency can significantly reduce helium-3, but because improving, frequency make gas and the heat exchange between the filler in the regenerator become insufficient, cause that THERMAL REGENERATOR EFFICIENCIES sharply descends, cause high-frequency vascular extremely low and can't obtain the cryogenic temperature of 1-2K in the efficient of low temperature warm area, it only is 3K that current high-frequency vascular refrigerator adopts the lowest refrigerating temperature of helium-3 working medium, for obtaining the cryogenic temperature of 1-2K, the precooling temperature that the more sum of series of high-frequency vascular refrigerator needs is lower (＜10K), refrigerator system also can become complicated unusually when lower precooling temperature was difficult to obtain, if with high-frequency vascular refrigerator with can lower temperature (＜10K) provide the low frequency vascular refrigerator of big pre-cold to be coupled together, to become a kind of compound vascular refrigerator of novel obtained 1-2K refrigeration warm area, because it is refrigeration working medium that the low frequency vascular refrigerator can adopt helium-4, so this compound vascular refrigerator only needs partly to adopt helium-3 at the high-frequency vascular refrigerator with smaller size smaller, namely adopts a spot of helium-3 gas just can obtain the cryogenic temperature of 1-2K.
In the compound multistage vascular refrigerator of the 1-2K that the utility model proposes, it is working medium that precooling level low frequency vascular refrigerator adopts traditional helium-4, can provide bigger pre-cold at 4K and the above warm area of 4K, and partly adopt helium-3 to be working medium at high-frequency vascular refrigerator, as previously mentioned, because this part running frequency is higher, structure is very compact, compare with the low frequency vascular refrigerator, its required helium-3 will rise less than 10 marks, thereby can realize using a small amount of helium-3 just can obtain the target of 1-2K warm area; Because the pre-cold of precooling level is enough big, obtains bigger phase modulation angle thereby can make low temperature inertia tube and air reservoir be cooled to lower temperature, and then provide more excellent phase angle (phase angle between mass flow and the pressure) for high-frequency vascular refrigerator; For increasing the cold junction pressure ratio of high-frequency vascular refrigerator, can between the regenerator of high-frequency vascular refrigerator different temperatures section, arrange the acoustic pressure amplifier that can increase pressure ratio; For reducing the consumption of helium-3, can select to use merely the low temperature inertia tube as pm mode, finally make complete machine obtain the cryogenic temperature of 1-2K efficiently.
Based on above-mentioned analysis and discussion, the utility model provides several pre-cold mould technical schemes, and following several compound multistage vascular refrigerator structures all can efficiently obtain the cryogenic temperature of 1-2K under the prerequisite of using less helium-3 working medium.
First kind of scheme is basic scheme of the present utility model, and be specific as follows:
A kind of compound multistage vascular refrigerator that is operated in 1-2K, comprise with helium-4 and be the precooling level low frequency vascular refrigerator unit of working medium and be the low temperature level high-frequency vascular refrigerator unit of working medium with helium-3 that described precooling level low frequency vascular refrigerator unit is two-stage low frequency vascular refrigerator; Described low temperature level high-frequency vascular refrigerator unit comprises the low temperature stage compressor, and the low temperature level regenerator hot end heat exchanger that is communicated with successively with low temperature stage compressor outlet, the low temperature level first precooling zone regenerator, the low temperature level first precooling zone regenerator cool end heat exchanger, the low temperature level second precooling zone regenerator, the low temperature level second precooling zone regenerator cool end heat exchanger, low temperature level second level acoustic pressure amplifier, low temperature grade low-temp section regenerator, low temperature level cool end heat exchanger, low temperature level vascular, low temperature level vascular hot-side heat exchanger and low temperature level phase modulation parts; Carry out a thermal coupling by the first order cool end heat exchanger that is connected precooling level low frequency vascular refrigerator unit, the second level precooling zone regenerator cool end heat exchanger of precooling level low frequency vascular refrigerator unit and the first order heat bridge between the low temperature level first precooling zone regenerator cool end heat exchanger between described precooling level low frequency vascular refrigerator unit and the low temperature level high-frequency vascular refrigerator unit; Second level cool end heat exchanger by being connected precooling level low frequency vascular refrigerator unit and the second level heat bridge of the low temperature level second precooling zone regenerator cool end heat exchanger carry out the secondary thermal coupling; Described second level acoustic pressure amplifier is inertance tube, the length of inertance tube be under its temperature and pressure of living in helium-3 gas corresponding wavelength 1/4, and second level acoustic pressure amplifier connects with second level bridging simultaneously.
Be to reduce the use cost of helium-3, as a kind of optimized technical scheme: described low temperature level phase modulation parts can be selected inertia tube, and described low temperature level vascular hot-side heat exchanger links to each other with second heat bridge with inertia tube simultaneously.Low temperature level phase modulation parts are selected inertia tube, compare with selecting other phase modulation parts for use, have further reduced the consumption of helium-3.
Be further raising system refrigeration performance, as second kind of optimized technical scheme: described low temperature level phase modulation parts are inertia tube and the air reservoir that is communicated with inertia tube, and low temperature level vascular hot-side heat exchanger, inertia tube and air reservoir while are communicated with second level heat bridge.
For further increasing the cold junction pressure ratio of low temperature level high-frequency vascular refrigerator unit, and then make low temperature level high-frequency vascular refrigeration unit obtain the cryogenic temperature of 1-2K efficiently, preferred as to first kind of technical scheme, be interconnected by first order acoustic pressure amplifier between the low temperature level first precooling zone regenerator cool end heat exchanger and the low temperature level second precooling zone regenerator in the described low temperature level high-frequency vascular refrigerator unit, first order acoustic pressure amplifier is the major diameter pipe, and the length of this major diameter pipe is helium-3 wavelength 1/4 under its place temperature and pressure.As the optimization to this technical scheme, described low temperature level phase modulation parts are inertia tube, and described low temperature level vascular hot-side heat exchanger links to each other with second heat bridge with inertia tube simultaneously.Perhaps, be to improve systematic function, described low temperature level phase modulation parts are inertia tube and the air reservoir that is communicated with inertia tube, and low temperature level vascular hot-side heat exchanger, inertia tube and air reservoir while are communicated with second level heat bridge.
The two-stage low frequency vascular refrigerator of gas coupling or thermal coupling can be selected in described precooling level low frequency vascular refrigerator unit.When selecting the two-stage low frequency vascular refrigerator of gas coupling, the refrigeration machine overall structure is comparatively compact, and it is less relatively to take up room; When selecting the two-stage low frequency vascular refrigerator of thermal coupling for use, the control of refrigeration machine parameter is convenient, is convenient to realize the optimization of operational factor.
Compared with prior art, the beneficial effects of the utility model are embodied in:
Compare as the 1-2K two-stage low frequency vascular refrigerator of working medium with existing employing helium-3, the single-stage high-frequency vascular refrigerator that working medium of two-stage low frequency vascular refrigerator precooling that the compound multistage vascular refrigerator structure employing working medium that the utility model proposes is helium-4 is helium-3, because the raising of frequency can reduce the volume of vascular refrigerator cold head and compressor significantly, so this structure can reduce the consumption of helium-3 significantly, according to preresearch estimates, the required volume of helium-3 under standard state of the composite structured acquisition 1-2K cryogenic temperature that the utility model proposes is less than 10 liters, much smaller than 228 liters of this specification background technology partial volume, so it is low that the structure that the utility model proposes has a cost, when advantage such as being easy to obtain, also kept the vascular refrigerator compact conformation, long and reliability advantages of higher of life-span is a kind of novel 1-2K warm area mechanical type refrigeration structure with huge potential application foreground.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of the compound multistage vascular refrigerator that is operated in 1-2K of the present utility model.
Fig. 2 is the structural representation of the another kind of embodiment of the compound multistage vascular refrigerator that is operated in 1-2K of the present utility model.
Fig. 3 is the structural representation of the third embodiment of the compound multistage vascular refrigerator that is operated in 1-2K of the present utility model.
Fig. 4 is the structural representation of the 4th kind of embodiment of the compound multistage vascular refrigerator that is operated in 1-2K of the present utility model.
In the above-mentioned accompanying drawing:
C1 is first order compressor, AC1 is first order level aftercooler, LV1 is first order compressor low-pressure control valve, HV1 is first order compressor high pressure control valve, RG1 is first order regenerator, HX2 is first order cool end heat exchanger, PT1 is first order vascular, HX3 is first order vascular hot-side heat exchanger, DO1 is first order bidirection air intake valve, O1 is the little ports valve of the first order, R1 is first order gas, C2 is high stage compressor, AC2 is second level level aftercooler, LV2 is the high stage compressor low-pressure control valve, HV2 is the high stage compressor high pressure control valve, RG21 is second level precooling zone regenerator, HX5 is second level precooling zone regenerator cool end heat exchanger, RG22 is second level low-temperature zone regenerator, HX6 is second level cool end heat exchanger, PT2 is second level vascular, HX7 is second level vascular hot-side heat exchanger, DO2 is second level bidirection air intake valve, O2 is that the little ports valve in the second level and R2 are second level air reservoir, C3 is the low temperature stage compressor, HX8 is low temperature level regenerator hot end heat exchanger, RG31 is the low temperature level first precooling zone regenerator, HX9 is the low temperature level first precooling zone regenerator cool end heat exchanger, RG32 is the low temperature level second precooling zone regenerator, HX10 is the low temperature level second precooling zone regenerator cool end heat exchanger, PA2 is second level acoustic pressure amplifier, RG33 is low temperature grade low-temp section regenerator, HX11 is low temperature level cool end heat exchanger, PT3 is low temperature level vascular, HX12 is low temperature level vascular hot-side heat exchanger, I3 is low temperature level inertia tube, TB1 is first order heat bridge, TB2 is second level heat bridge, R3 is low temperature level air reservoir.
The specific embodiment
Embodiment 1:
As shown in Figure 1, a kind of compound multistage vascular refrigerator that is operated in 1-2K, comprise: precooling level first order low frequency vascular refrigerator, precooling level second level low frequency vascular refrigerator, first order heat bridge TB1, second level heat bridge TB2 and low temperature level high frequency low temperature pulse tubes refrigeration machine, precooling level first order low frequency vascular refrigerator and precooling level second level low frequency vascular refrigerator are formed precooling level low frequency vascular refrigerator unit, provide precooling by first order heat bridge TB1 and second level heat bridge TB2 for low temperature level high frequency low temperature pulse tubes refrigeration machine.
Wherein precooling level first order low frequency vascular refrigerator is made up of first order compressor C1, first order level aftercooler AC1, first order compressor low-pressure control valve LV1, first order compressor high pressure control valve HV1, first order regenerator RG1, first order cool end heat exchanger HX2, first order vascular PT1, first order vascular hot-side heat exchanger HX3, first order bidirection air intake valve DO1, first order aperture valve O1, first order air reservoir R1.Precooling level second level low frequency vascular refrigerator is by high stage compressor C2, second level level aftercooler AC2, high stage compressor low-pressure control valve LV2, high stage compressor high pressure control valve HV2, second level precooling zone regenerator RG21, second level precooling zone regenerator cool end heat exchanger HX5, second level low-temperature zone regenerator RG22, second level cool end heat exchanger HX6, second level vascular PT2, second level vascular hot-side heat exchanger HX7, second level bidirection air intake valve DO2, second level aperture valve O2 and second level air reservoir R2 form.Low temperature level high frequency low temperature pulse tubes refrigeration machine comprises low temperature stage compressor C3, low temperature level regenerator hot end heat exchanger HX8, the low temperature level first precooling zone regenerator RG31, the low temperature level first precooling zone regenerator cool end heat exchanger HX9, the low temperature level second precooling zone regenerator RG32, the low temperature level second precooling zone regenerator cool end heat exchanger HX10, second level acoustic pressure amplifier PA2, low temperature grade low-temp section regenerator RG33, low temperature level cool end heat exchanger HX11, low temperature level vascular PT3, low temperature level vascular hot-side heat exchanger HX12 and low temperature level inertia tube I3.
The annexation of above-mentioned each parts is as follows:
First order compressor C1, first order level aftercooler AC1, first order compressor high pressure control valve HV1 and first order compressor low-pressure control valve LV1 contact successively and form the closed circuit of first order low frequency compressor bank; Pipeline connection between the entrance of first order regenerator RG1 and first order compressor high pressure control valve HV1 and the first order compressor low-pressure control valve LV1; The outlet of first order regenerator RG1 is communicated with first order cool end heat exchanger HX2, first order vascular PT1, first order vascular hot-side heat exchanger HX3, first order aperture valve O1 and first order air reservoir R1 import successively by pipeline; Pipeline connection between first order bidirection air intake valve DO1 one end and first order regenerator RG1 and the first order low frequency compressor bank, the pipeline connection between the first order bidirection air intake valve DO1 other end and first order aperture valve O1 and the first order vascular hot-side heat exchanger HX3.
High stage compressor C2, second level level aftercooler AC2, high stage compressor high pressure control valve HV2 and high stage compressor low-pressure control valve LV2 are communicated with the closed circuit that forms second level low frequency compressor bank successively; Pipeline connection between the entrance of second level precooling zone regenerator RG21 and high stage compressor high pressure control valve HV2 and the high stage compressor low-pressure control valve LV2; The outlet of second level precooling zone regenerator RG21 is communicated with second level precooling zone regenerator cool end heat exchanger HX5, second level low-temperature zone regenerator RG22, second level cool end heat exchanger HX6, second level vascular PT2, second level vascular hot-side heat exchanger HX7, second level aperture valve O2 and second level air reservoir R2 successively by pipeline; Pipeline connection between second level bidirection air intake valve DO2 one end and second level low frequency compressor bank and the second level precooling zone regenerator RG21, the pipeline connection between the other end of second level bidirection air intake valve DO2 and second level aperture valve O2 and the second level vascular hot-side heat exchanger HX7;
The outlet of low temperature stage compressor C3 by pipeline successively with low temperature level regenerator hot end heat exchanger HX8, the low temperature level first precooling zone regenerator RG31, the low temperature level first precooling zone regenerator cool end heat exchanger HX9, the low temperature level second precooling zone regenerator RG32, the low temperature level second precooling zone regenerator cool end heat exchanger HX10, second level acoustic pressure amplifier PA2, low temperature grade low-temp section regenerator RG33, low temperature level cool end heat exchanger HX11, low temperature level vascular PT3, low temperature level vascular hot-side heat exchanger HX12, low temperature level inertia tube I3 is communicated with.
First order cool end heat exchanger HX2, second level precooling zone regenerator cool end heat exchanger HX5 and the low temperature level first precooling zone regenerator cool end heat exchanger HX9 are connected with first order heat bridge TB1 respectively, and the second level cool end heat exchanger HX6 of precooling vascular refrigerator unit, the second level, the low temperature level second precooling zone regenerator cool end heat exchanger HX10, low temperature level vascular hot-side heat exchanger HX12 are connected with second level heat bridge TB2 respectively with low temperature level inertia tube I3.
The running of the compound vascular refrigerator of 1-2K of present embodiment is:
Starting stage, first order compressor low pressure modulating valve LV1, first order compressor septum valve HV1 all is in closed condition, gas becomes high temperature and high pressure gas after compressing through first order compressor C1, high temperature and high pressure gas is flowed through and is cooled to room temperature behind the first order level aftercooler AC1, when gas pressure is higher than setting value, first order compressor septum valve HV1 opens, the high pressure room temperature air is from first order compressor high pressure valve HV1 outflow and be divided into two strands, one is by first order regenerator RG1 and carry out the heat exchange temperature with wherein filler and reduce and enter in the follow-up associated components, another strand enters in the follow-up associated components by first order bidirection air intake valve DO1, make whole system all be in high pressure conditions, first order compressor septum valve HV1 closes then, first order compressor low pressure modulating valve LV1 opens, gas is divided into two strands from first order air reservoir R1 through first order aperture valve O1, one gets back to first order compressor C1 from first order bidirection air intake valve DO1 by first order compressor low pressure modulating valve LV1, another stock-traders' know-how is crossed first order vascular PT1, first order regenerator RG1 finally gets back to first order compressor C1 by first order compressor low pressure modulating valve LV1, finish a circulation thus, in cyclic process, there is the temperature difference in the gas of turnover first order cool end heat exchanger HX2, produce refrigeration effect thus, first order cold takes out the gas that enters second level precooling low frequency vascular refrigerator low-temperature zone regenerator RG22 and the low temperature level high-frequency vascular refrigerator second precooling zone regenerator RG32 in order to precooling by first order heat bridge TB1 from first order cool end heat exchanger HX2.
Starting stage, high stage compressor low pressure modulating valve LV2, high stage compressor septum valve HV2 all is in closed condition, gas becomes high temperature and high pressure gas after compressing through high stage compressor C2, high temperature and high pressure gas is flowed through and is cooled to room temperature behind the level aftercooler AC2 of the second level, when gas pressure is higher than setting value, high stage compressor septum valve HV2 opens, the high pressure room temperature air is from high stage compressor high pressure valve HV2 outflow and be divided into two strands, one is by second level precooling zone regenerator RG21 and be cooled to the cryogenic temperature of the first order at the second level precooling zone regenerator cool end heat exchanger HX5 that its cold junction is connected with second level heat bridge TB, enter then in the follow-up associated components, another strand enters in the follow-up associated components by second level bidirection air intake valve DO2, make whole system all be in high pressure conditions, high stage compressor septum valve HV2 closes then, high stage compressor low pressure modulating valve LV2 opens, gas is divided into two strands from second level air reservoir R2 through second level aperture valve O2, one gets back to high stage compressor C2 from second level bidirection air intake valve DO2 by high stage compressor low pressure modulating valve LV2, another stock-traders' know-how is crossed second level vascular PT2, second level low-temperature zone regenerator RG22, second level precooling zone regenerator RG21 finally gets back to high stage compressor C2 by high stage compressor low pressure modulating valve LV2, finish a circulation thus, in cyclic process, there is the temperature difference in the gas of turnover second level cool end heat exchanger HX6, produces refrigeration effect thus.Second level cold takes out gas and low temperature level vascular hot-side heat exchanger HX12 and the low temperature level inertia tube I3 that enters low temperature level high-frequency vascular refrigerator low-temperature zone regenerator RG33 in order to precooling from the cool end heat exchanger HX6 of the second level by second level heat bridge TB2.
At high pressure phase, flow through through the high temperature and high pressure gas of low temperature stage compressor C3 compression and to be cooled to room temperature behind the low temperature level regenerator hot end heat exchanger HX8, then with the low temperature grade low-temp high-frequency vascular first precooling zone regenerator RG31 in the backheat filler carry out heat exchange, temperature reduces, be cooled to the cold junction temperature of first order vascular refrigerator at the low temperature level first precooling zone regenerator cool end heat exchanger HX9 place, gas enters the low temperature level second precooling zone regenerator RG32 and carries out heat exchange with wherein backheat filler then, temperature reduces, be cooled to the cold junction temperature of second level vascular refrigerator at the low temperature level second precooling zone regenerator cool end heat exchanger HX10 place, second level acoustic pressure amplifier PA2 then successively flows through, low temperature grade low-temp section regenerator RG33, low temperature level cool end heat exchanger HX11, low temperature level vascular PT3, low temperature level vascular hot-side heat exchanger HX12 enters low temperature level inertia tube I3; Enter low pressure cycle then, gas passes through low temperature level vascular hot-side heat exchanger HX12 successively from low temperature level inertia tube I3, low temperature level vascular PT3, low temperature level cool end heat exchanger HX11, low temperature grade low-temp section regenerator RG33, second level acoustic pressure amplifier PA2, the low temperature level second precooling zone regenerator cool end heat exchanger HX10, the low temperature level second precooling zone regenerator RG32, the low temperature level first precooling zone regenerator cool end heat exchanger HX9, the low temperature level first precooling zone regenerator RG31, low temperature level regenerator hot end heat exchanger HX8 gets back to and finishes a circulation among the low temperature stage compressor C3, there is the temperature difference in the gas of turnover low temperature level cool end heat exchanger HX11 in cyclic process, thereby at the cryogenic temperature of low temperature level cool end heat exchanger HX11 place acquisition 1-2K and produce refrigeration effect.
Among the embodiment 1, second level acoustic pressure amplifier PA2 is inertance tube, the length of inertance tube be under its temperature and pressure of living in helium-3 gas corresponding wavelength 1/4, can select to process voluntarily, perhaps select commercially available metal tube as required.The structure of other mentioned elements is prior art in the present embodiment, no longer describes in detail again.
Embodiment 2:
As shown in Figure 2, a kind of compound vascular refrigerator that is operated in 1-2K, be with the difference of embodiment 1: the pm mode of its low temperature level high-frequency vascular refrigerator is the combination of low temperature level inertia tube I3 and low temperature level air reservoir R3, and low temperature level air reservoir R3 is arranged on the heat bridge TB2 of the second level, by using low temperature level air reservoir R3, can obtain more excellent phase modulation angle in low temperature level high-frequency vascular refrigerator, the final low temperature level high-frequency vascular refrigerator that further improves is at the refrigerating efficiency of 1-2K.
Embodiment 3:
As shown in Figure 3, a kind of compound vascular refrigerator that is operated in 1-2K, and the difference of embodiment 1 is: arranged a first order acoustic pressure amplifier PA1 who is used for amplifying the low temperature level first precooling zone regenerator cold junction pressure ratio between the low temperature level first precooling zone regenerator cool end heat exchanger HX9 and the low temperature level second precooling zone regenerator RG32, first order acoustic pressure amplifier PA1 can make the cold junction pressure ratio of low temperature level high-frequency vascular refrigerator further amplify, thereby makes it have higher efficient at the 1-2K warm area.
Embodiment 4:
As shown in Figure 4, a kind of compound vascular refrigerator that is operated in 1-2K, and the difference of embodiment 2 is: arranged a first order acoustic pressure amplifier PA1 who is used for amplifying the low temperature level first precooling zone regenerator cold junction pressure ratio between the low temperature level first precooling zone regenerator cool end heat exchanger HX9 and the low temperature level second precooling zone regenerator RG32, first order acoustic pressure amplifier PA1 can make the cold junction pressure ratio of low temperature level high-frequency vascular refrigerator further amplify, thereby makes it have higher efficient at the 1-2K warm area.
Claims (8)
1. compound multistage vascular refrigerator that is operated in 1-2K, comprise with helium-4 and be the precooling level low frequency vascular refrigerator unit of working medium and be the low temperature level high-frequency vascular refrigerator unit of working medium with helium-3 that described precooling level low frequency vascular refrigerator unit is two-stage low frequency vascular refrigerator; It is characterized in that:
Described low temperature level high-frequency vascular refrigerator unit comprises low temperature stage compressor (C3), and the low temperature level regenerator hot end heat exchanger (HX8) that is communicated with successively with low temperature stage compressor outlet, the low temperature level first precooling zone regenerator (RG31), the low temperature level first precooling zone regenerator cool end heat exchanger (HX9), the low temperature level second precooling zone regenerator (RG32), the low temperature level second precooling zone regenerator cool end heat exchanger (HX10), low temperature level second level acoustic pressure amplifier (PA2), low temperature grade low-temp section regenerator (RG33), low temperature level cool end heat exchanger (HX11), low temperature level vascular (PT3), low temperature level vascular hot-side heat exchanger (HX12) and low temperature level phase modulation parts;
Carry out a thermal coupling by the first order cool end heat exchanger (HX2) that is connected precooling level low frequency vascular refrigerator unit, the second level precooling zone regenerator cool end heat exchanger (HX5) of precooling level low frequency vascular refrigerator unit and the first order heat bridge (TB1) between the low temperature level first precooling zone regenerator cool end heat exchanger (HX9) between described precooling level low frequency vascular refrigerator unit and the low temperature level high-frequency vascular refrigerator unit; Second level cool end heat exchanger (HX6) by being connected precooling level low frequency vascular refrigerator unit and the second level heat bridge (TB2) of the low temperature level second precooling zone regenerator cool end heat exchanger (HX10) carry out the secondary thermal coupling;
Described second level acoustic pressure amplifier (PA2) is inertance tube, the length of inertance tube be under its temperature and pressure of living in helium-3 gas corresponding wavelength 1/4, and second level acoustic pressure amplifier (PA2) is connected with second level bridge (TB2) simultaneously.
2. the compound multistage vascular refrigerator that is operated in 1-2K according to claim 1, it is characterized in that: described low temperature level phase modulation parts are inertia tube, and described low temperature level vascular hot-side heat exchanger (HX12) links to each other with second heat bridge (TB2) with inertia tube simultaneously.
3. the compound multistage vascular refrigerator that is operated in 1-2K according to claim 1, it is characterized in that: described low temperature level phase modulation parts are inertia tube and the air reservoir that is communicated with inertia tube, and low temperature level vascular hot-side heat exchanger (HX12), inertia tube and air reservoir are communicated with second level heat bridge (TB2) simultaneously.
4. the compound multistage vascular refrigerator that is operated in 1-2K according to claim 1, it is characterized in that: be interconnected by first order acoustic pressure amplifier (PA1) between the low temperature level first precooling zone regenerator cool end heat exchanger (HX9) and the low temperature level second precooling zone regenerator (RG32) in the described low temperature level high-frequency vascular refrigerator unit, first order acoustic pressure amplifier (PA1) is the major diameter pipe, and the length of this major diameter pipe is helium-3 wavelength 1/4 under its place temperature and pressure.
5. the compound multistage vascular refrigerator that is operated in 1-2K according to claim 4, it is characterized in that: described low temperature level phase modulation parts are inertia tube, and described low temperature level vascular hot-side heat exchanger (HX12) links to each other with second heat bridge (TB2) with inertia tube simultaneously.
6. the compound multistage vascular refrigerator that is operated in 1-2K according to claim 4, it is characterized in that: described low temperature level phase modulation parts are inertia tube and the air reservoir that is communicated with inertia tube, and low temperature level vascular hot-side heat exchanger (HX12), inertia tube and air reservoir are communicated with second level heat bridge (TB2) simultaneously.
7. according to the described compound multistage vascular refrigerator that is operated in 1-2K of the arbitrary claim of claim 1～6, it is characterized in that: described precooling level low frequency vascular refrigerator unit is the two-stage low frequency vascular refrigerator of gas coupling.
8. according to the described compound multistage vascular refrigerator that is operated in 1-2K of the arbitrary claim of claim 1～6, it is characterized in that: described precooling level low frequency vascular refrigerator unit is the two-stage low frequency vascular refrigerator of thermal coupling.
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| CN 201320026569 CN203190705U (en) | 2013-01-17 | 2013-01-17 | Composite multistage pulse tube refrigerator working under temperature span of 1-2K |
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| CN 201320026569 CN203190705U (en) | 2013-01-17 | 2013-01-17 | Composite multistage pulse tube refrigerator working under temperature span of 1-2K |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017395A (en) * | 2013-01-17 | 2013-04-03 | 浙江大学 | Composite multi-stage pulse tube refrigerator working in 1-2K temperature zone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017395A (en) * | 2013-01-17 | 2013-04-03 | 浙江大学 | Composite multi-stage pulse tube refrigerator working in 1-2K temperature zone |
| CN103017395B (en) * | 2013-01-17 | 2014-11-05 | 浙江大学 | Composite multi-stage pulse tube refrigerator working in 1-2K temperature zone |
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