CN103776237B - The helium liquefaction device of purifying redundancy in the band of a kind of multiple stage refrigeration machine precooling - Google Patents
The helium liquefaction device of purifying redundancy in the band of a kind of multiple stage refrigeration machine precooling Download PDFInfo
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Abstract
Comprise with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling: a N platform refrigeration machine, the series-parallel one-level cold header heat exchanger having interior purifying function concurrently of N-1 platform; Be located at M platform parallel condensing device and N-M platform series connection secondary cold header heat exchanger in radome; Helium is successively through the precooling of firsts and seconds cold header heat exchanger; The liquefaction of laggard condenser, post liquefaction liquid confluxes and flows into liquid helium storage device; The one-level cold head of a refrigeration machine is connected with radome for it provides cold; This cold-producing medium secondary cold head is connected with a secondary cold header heat exchanger; All the other refrigeration machine one-level cold heads are connected with one-level cold header heat exchanger respectively, and for be separately connected one-level cold header heat exchanger cold is provided, the part secondary cold head of all the other refrigeration machines is connected with secondary cold header heat exchanger respectively for secondary cold header heat exchanger provides cold; All the other refrigeration machine another part secondary cold heads are connected with condenser respectively for it provides cold; There is structure simple, easy to operate, take up an area little, operate the advantages such as stable.
Description
Technical field
The present invention relates to refrigeration and cryogenic technology field, particularly a kind of with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling.
Background technology
Current low-temperature receiver-the liquid helium that uniquely facilitates as reaching 4.2K has been widely used in large, medium and small cryogenic system and low temperature test room.For large-scale low-temperature system, liquid helium consumption is huge, and the standard helium liquefier of commercialization on market can be adopted to provide liquid helium, and as Liang Jia helium liquefier manufacturer woods moral and method liquid air company, the liquefaction amount according to liquid helium consumption and helium liquefier chooses model.But for middle-size and small-size cryogenic system and low temperature test room, as NMR, superconductive magnetometer, high-speed superconducting magnetic suspension train etc., the little then only a few L/d of daily consumption liquid helium amount, large also only has 150L/d.According to standard helium liquefier, then there is following problem: first, outfit standard helium liquefier, estimate with the helium liquefier of the minimum helium liquefaction amount 30L/h of method liquid air company of helium liquefier manufacturer, if consume 150L/d, then rich liquid helium amount is 330L day, therefore liquid helium reservoir vessel must be equipped with, On Tranofer Tube For Liquid Helium, woven hose grafting is first-class, thus cause the consumption of liquid helium in storage and filling process by the consumption much larger than cryogenic system itself, cause energy waste, particularly for this helium scarcity of resources of China, the cost extracting helium is high, the country of dependence on import always, the expensive of liquid helium, helium is appraised and decided and is limited raw helium output for strategic materials by the U.S. in 2007, cause China's liquid helium price by original 60 ~ 80 yuan/often liter, go up and be doubled to current 200 yuan/more than often liter, therefore standard helium liquefier is adopted, operating cost will increase substantially.Secondly, standard helium liquefier is a system complex, needs civil engineering supporting, and as compressor ground and the facility such as house, gas holder, and compressor, ice chest and control thereof need point rooms and putting, and floor space is large, safeguards complicated, the technical staff of action need special training.Therefore standard helium liquefier is adopted all to cause very large waste for middle-size and small-size cryogenic system provides in liquid helium manpower or financial resources.
If middle-size and small-size cryogenic system is not equipped with helium liquefier, and directly from other helium liquefier packing liquid helium, one side is carried and in filled process, liquid helium is wasted serious, on the other hand when being subject in limited time because of odjective cause transport, system cloud gray model is also affected, particularly some special device cryogenic system, as the cryogenic system of ecr ion source, filling liquid helium needs to stop ion gun and runs, and causes the waste of experimental period and the energy, even the carrying out of influence research work.The import of following expectation helium is more under one's control, the existing many scientific research projects relating to helium and liquid helium of China cannot may be implemented because of without liquid helium supply when the time comes.
Therefore for middle-size and small-size cryogenic system liquid helium consumption, need to build suitable microminiature helium liquefaction device.There is ripe small-sized Cryo Refrigerator product in the market, make construction microminiature helium liquefaction device become possibility.Be low-temperature receiver for different liquid helium consumptions exploitation varying number refrigeration machine, with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling, have very important significance.
Summary of the invention
The object of the present invention is to provide a kind of with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling, to solve present middle-size and small-size cryogenic system liquid helium problem.
Technical scheme of the present invention is as follows:
Provided by the invention with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling, it comprises:
One is placed in the helium air inlet pipe for the air inlet of raw material helium in vacuum (-tight) housing, and described raw material helium is the helium that the purity of the helium or the recovery of other approach being evaporated to room temperature in liquid helium bath is not less than 99%;
N platform refrigeration machine, described N is the positive integer of 2 ~ 48;
N-1 platform is placed in the mutual series-parallel one-level cold header heat exchanger in described vacuum (-tight) housing, and described one-level cold header heat exchanger is the dividing wall type heat exchanger having interior purifier purifying function concurrently; The raw material helium entered enters described mutual series-parallel N-1 platform one-level cold header heat exchanger by described helium air inlet pipe and carries out precooling;
One radome is set in described vacuum (-tight) housing;
M platform is placed in the condenser of the parallel connection in described radome, and described M is at least 1, and M is less than N;
N-M platform is placed in the secondary cold header heat exchanger of the mutual series connection in described radome; The secondary cold header heat exchanger that raw material helium after the precooling of described one-level cold header heat exchanger enters described mutual series connection carries out precooling again;
The condenser entering described parallel connection through the raw material helium of described secondary cold header heat exchanger precooling again liquefies, the liquid that obtains of liquefying confluxes and flows into liquid collecting tank 6, and is flowed into by the transfusion Dewar pipe 7 be connected with described liquid collecting tank and be placed in liquid helium Dewar bottle outside described vacuum (-tight) housing or liquid helium storage device;
The one-level cold head of a refrigeration machine in described N platform refrigeration machine is connected with radome by heat bridge, and provides cold for described radome; The secondary cold head of this cold-producing medium is connected by heat bridge with a described secondary cold header heat exchanger;
The one-level cold head of other refrigeration machine in described N platform refrigeration machine is connected with described one-level cold header heat exchanger respectively by heat bridge, and for be separately connected one-level cold header heat exchanger cold is provided, a part of secondary cold head of other refrigeration machine in described N platform refrigeration machine is connected with described secondary cold header heat exchanger respectively by heat bridge, and provides cold for described secondary cold header heat exchanger; Another part secondary cold head of other refrigeration machine in described N platform refrigeration machine is connected with described condenser respectively by heat bridge, and provides cold for described condenser.
Described refrigeration machine is G-M refrigeration machine, pulse tube refrigerating machine, sterlin refrigerator or small-sized Cryo Refrigerator.Refrigerating capacity when described small-sized Cryo Refrigerator refers to that secondary cold head temperature is 4.2K is less than the Cryo Refrigerator of 1.5W.
Described one-level cold header heat exchanger and secondary cold header heat exchanger are the heat exchanger that oxygen-free copper makes; Described condenser is the condenser that oxygen-free copper makes.
In the band of multiple stage refrigeration machine of the present invention precooling, the helium liquefaction device of purifying redundancy and the connected mode of cryogenic system liquid helium bath can be designed to open type and enclosed two kinds, described open type be raw material helium that the approach such as steel cylinder provide enter multiple stage refrigeration machine of the present invention precooling band in the helium liquefaction device of purifying redundancy, the liquid helium of post liquefaction flows into liquid helium bath, as Fig. 1 by transfusion Dewar pipe 7; Described enclosed is that the helium tube of cryogenic system liquid helium bath evaporation connects the helium air inlet pipe 1 of apparatus of the present invention, and transfusion Dewar pipe 7 inserts the liquid helium bath of cryogenic system, utilizes siphonage self-loopa to run, without the need to the circulation powers such as pump and peripheral apparatus thereof.
In the band of multiple stage refrigeration machine of the present invention precooling, the helium liquefaction device of purifying redundancy can be applicable to the middle-size and small-size cryogenic system (10L/d ~ 720L/d) of liquid helium consumption lower than commercial standard (CS) helium liquefier output.
Compared with prior art, of the present invention with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling, its advantage is: adopt the small-sized Cryo Refrigerator of multiple stage as low-temperature receiver, meet middle-size and small-size cryogenic system liquid helium; The cold header heat exchanger of dividing wall type has interior purifier purifying function concurrently, by multi-stage precooling, raw material helium, at the Simultaneous purification of cooling, not only increases the liquefied fraction of helium liquefaction device, and do not need to arrange interior purifier in addition, can directly by 99% purity raw material helium liquefaction; If by enclosed described above, then can realize self-loopa, without the need to the circulation powers such as pump and peripheral apparatus thereof, in cryogenic system liquid helium bath, liquid level remains unchanged, and does not need to shut down liquid feeding, decreases liquid feeding cost, improves conventional efficient; In addition, it is simple that apparatus of the present invention also have structure, and easy to operate, floor space is little, operates the advantages such as stable.
Accompanying drawing explanation
Fig. 1 be the present invention's (embodiment 1) with the helium liquefaction device schematic flow sheet of purifying redundancy in the band of multiple stage refrigeration machine precooling;
Fig. 2-1 and Fig. 2-2 be the present invention's (embodiment 1) with the helium liquefaction apparatus structure schematic diagram of purifying redundancy in the band of multiple stage refrigeration machine precooling.
Fig. 3 be the present invention's (embodiment 2) with the helium liquefaction device schematic flow sheet of purifying redundancy in the band of multiple stage refrigeration machine precooling.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1:
Fig. 1 be the present invention's (embodiment 1) with the helium liquefaction device schematic flow sheet of purifying redundancy in the band of multiple stage refrigeration machine precooling; Fig. 2 be embodiment 1 with the helium liquefaction apparatus structure schematic diagram of purifying redundancy in the band of multiple stage refrigeration machine precooling; As seen from the figure, provided by the invention with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling, it comprises:
One is placed in the helium air inlet pipe 1 for the air inlet of raw material helium in vacuum (-tight) housing 9, and described raw material helium is the helium that the purity of the helium or the recovery of other approach being evaporated to room temperature in liquid helium bath is not less than 99%;
N platform refrigeration machine 2, described N is the positive integer of 2 ~ 48;
N-1 platform is placed in the mutual series-parallel one-level cold header heat exchanger 3 in described vacuum (-tight) housing 9, and described one-level cold header heat exchanger 3 is for having the dividing wall type heat exchanger of interior purifier purifying function concurrently; The raw material helium entered enters described mutual series-parallel N-1 platform one-level cold header heat exchanger 3 by described helium air inlet pipe 1 and carries out precooling;
One radome 8 is set in described vacuum (-tight) housing 9;
M platform is placed in the condenser 5 of the parallel connection in described radome 8, and described M is at least 1, and M is less than N;
N-M platform is placed in the secondary cold header heat exchanger 4 of the mutual series connection in described radome 8; The secondary cold header heat exchanger 4 that raw material helium after the precooling of described one-level cold header heat exchanger 3 enters described mutual series connection carries out precooling again;
The condenser 5 entering described parallel connection through the raw material helium of described secondary cold header heat exchanger 4 precooling again liquefies, the liquid that obtains of liquefying confluxes and flows into liquid collecting tank 6, and is flowed into by the transfusion Dewar pipe 7 be connected with described liquid collecting tank 6 and be placed in liquid helium Dewar bottle outside described vacuum (-tight) housing 9 or liquid helium storage device;
The one-level cold head of a refrigeration machine in described N platform refrigeration machine 2 is connected with radome 8 by heat bridge, and provides cold for described radome 8; The secondary cold head of this cold-producing medium is connected by heat bridge with a described secondary cold header heat exchanger 4;
The one-level cold head of other refrigeration machine in described N platform refrigeration machine 2 is connected with described one-level cold header heat exchanger 3 respectively by heat bridge, and for be separately connected one-level cold header heat exchanger cold is provided, a part of secondary cold head of other refrigeration machine in described N platform refrigeration machine 2 is connected with described secondary cold header heat exchanger 4 respectively by heat bridge, and provides cold for described secondary cold header heat exchanger; Another part secondary cold head of other refrigeration machine in described N platform refrigeration machine 2 is connected with described condenser 5 respectively by heat bridge, and provides cold for described condenser 5.
Described refrigeration machine 2 is G-M refrigeration machine, pulse tube refrigerating machine, sterlin refrigerator or small-sized Cryo Refrigerator.Refrigerating capacity when described small-sized Cryo Refrigerator refers to that secondary cold head temperature is 4.2K is less than the Cryo Refrigerator of 1.5W.
Described one-level cold header heat exchanger 3 and secondary cold header heat exchanger 4 are the heat exchanger that oxygen-free copper makes; The condenser that described condenser 5 makes for oxygen-free copper.
In the band of multiple stage refrigeration machine of the present invention precooling, the helium liquefaction device of purifying redundancy and the connected mode of cryogenic system liquid helium bath can be designed to open type and enclosed two kinds, described open type be raw material helium that the approach such as steel cylinder provide enter multiple stage refrigeration machine of the present invention precooling band in the helium liquefaction device of purifying redundancy, the liquid helium of post liquefaction flows into liquid helium bath, as Fig. 1 by transfusion Dewar pipe 7; Described enclosed is that the helium tube of cryogenic system liquid helium bath evaporation connects the helium air inlet pipe 1 of apparatus of the present invention, and transfusion Dewar pipe 7 inserts the liquid helium bath of cryogenic system, utilizes siphonage self-loopa to run, without the need to the circulation powers such as pump and peripheral apparatus thereof.
Below the helium flow journey of the present invention's (embodiment 1) Fig. 1: purity be more than 99% raw material helium flow into vacuum (-tight) housing 9 by helium air inlet pipe 1 after, be divided into two strands; After two strands of raw material helium enter respectively and mix after the one-level cold header heat exchanger be connected with refrigeration machine D one-level cold head and the one-level cold header heat exchanger be connected with refrigeration machine E one-level cold head carry out precooling, enter the one-level cold header heat exchanger of one-level cold header heat exchanger with refrigeration machine C and refrigeration machine B successively, and then enter the secondary cold header heat exchanger of the secondary cold header heat exchanger of refrigeration machine A, the secondary cold header heat exchanger of refrigeration machine B and refrigeration machine C in turn, finally be divided into two strands of helium, enter the condenser of refrigeration machine D and refrigeration machine E respectively, helium is condensed liquefaction; The liquid helium of post liquefaction is flowed to liquid collecting tank 6, flows into cryogenic system liquid helium bath by transfusion Dewar pipe 7; The one-level cold header heat exchanger of refrigeration machine A is used for providing radome 8 cold used; In order to reduce to leak heat, the one-level refrigeration head of cold-producing medium is all placed in vacuum (-tight) housing 9, and the secondary cold head of cold-producing medium is all placed in radome 8.
Fig. 2-1 and soil-2 are the structural representation of the present invention adopting Fig. 1 flow process, as shown in the figure, one-level cold header heat exchanger 3 and secondary cold header heat exchanger 4 and condenser 5 are all oxygen-free copper heat exchanger, adopt bolt heat to be connected with refrigeration machine, and place indium sheet in junction and reduce its thermal contact resistance.One-level cold header heat exchanger 3 adopts dividing wall type heat exchanger, has interior purifier function concurrently, the Simultaneous purification helium of precooling helium, and gaseous impurity is frozen in dividing wall type heat exchanger partition, so as not in helium pipeline frozen block.
Embodiment 2:
Fig. 3 be the present invention's (embodiment 2) with the helium liquefaction device schematic flow sheet of purifying redundancy in the band of multiple stage refrigeration machine precooling; As seen from the figure, provided by the invention with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling, it comprises:
One is placed in the helium air inlet pipe 1 for the air inlet of raw material helium in vacuum (-tight) housing 9, and described raw material helium is that to be evaporated to the purity that the helium of room temperature or other approach reclaim in liquid helium bath be the helium of more than 99%;
2 refrigeration machines 2;
1 one-level cold header heat exchanger 3 be placed in described vacuum (-tight) housing 9, described one-level cold header heat exchanger 3 is for having the dividing wall type heat exchanger of interior purifier purifying function concurrently; The raw material helium entered enters described 1 one-level cold header heat exchanger 3 by described helium air inlet pipe 1 and carries out precooling;
One radome 8 is set in described vacuum (-tight) housing 9;
1 condenser 5 being placed in the parallel connection in described radome 8, the secondary cold head of 1 refrigeration machine in described 2 refrigeration machines 2 is connected with described condenser 5 respectively by heat bridge, and provides cold for described condenser 5.
1 secondary cold header heat exchanger 4 be placed in described radome 8; Raw material helium after the precooling of described one-level cold header heat exchanger 3 enters described secondary cold header heat exchanger 4 and carries out precooling again;
The condenser 5 entering described parallel connection through the raw material helium of described secondary cold header heat exchanger 4 precooling again liquefies, the liquid that obtains of liquefying confluxes and flows into liquid collecting tank 6, and is flowed into by the transfusion Dewar pipe 7 be connected with described liquid collecting tank 6 and be placed in liquid helium Dewar bottle outside described vacuum (-tight) housing 9 or liquid helium storage device;
The one-level cold head of a refrigeration machine in described 2 refrigeration machines 2 is connected with radome 8 by heat bridge, and provides cold for described radome 8; The secondary cold head of this cold-producing medium is connected by heat bridge with a described secondary cold header heat exchanger 4;
Described one-level cold header heat exchanger 3 is dividing wall type heat exchanger, have interior purifier function concurrently, without the need to designing interior purifier in addition, raw material helium enters described one-level cold header heat exchanger 3 by described helium air inlet pipe 1 with connection in series-parallel combining form, the impurity in raw material helium is freezed, purifying helium while multi-stage precooling.
In the band of multiple stage refrigeration machine of the present invention precooling, the helium liquefaction device of purifying redundancy and the connected mode of cryogenic system liquid helium bath can be designed to open type and enclosed two kinds, described open type be raw material helium that the approach such as steel cylinder provide enter multiple stage refrigeration machine of the present invention precooling band in the helium liquefaction device of purifying redundancy, the liquid helium of post liquefaction flows into liquid helium bath, as Fig. 1 by transfusion Dewar pipe 7; Described enclosed is that the helium tube of cryogenic system liquid helium bath evaporation connects the helium air inlet pipe 1 of apparatus of the present invention, and transfusion Dewar pipe 7 inserts the liquid helium bath of cryogenic system, utilizes siphonage self-loopa to run, without the need to the circulation powers such as pump and peripheral apparatus thereof.
Fig. 3 is the helium flow journey of (embodiment 2): purity be more than 99% raw material helium flow into vacuum (-tight) housing 9 by helium air inlet pipe 1 after, enter after the one-level cold header heat exchanger be connected with refrigeration machine B one-level cold head carries out precooling, enter the secondary cold header heat exchanger precooling again of refrigeration machine A again, finally enter the condenser of refrigeration machine B, helium is condensed liquefaction; The liquid helium of post liquefaction is flowed to liquid collecting tank 6, flows into cryogenic system liquid helium bath by transfusion Dewar pipe 7; The one-level cold header heat exchanger of refrigeration machine A is used for providing radome 8 cold used; In order to reduce to leak heat, the one-level refrigeration head of cold-producing medium is all placed in vacuum (-tight) housing 9, and the secondary cold head of cold-producing medium is all placed in radome 8.
Embodiment 3:
Of the present invention with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling, N be 20 embodiment 3 comprise:
One is placed in the helium air inlet pipe 1 for the air inlet of raw material helium in vacuum (-tight) housing 9, and described raw material helium is that to be evaporated to the purity that the helium of room temperature or other approach reclaim in liquid helium bath be the helium of more than 99%;
20 refrigeration machines 2;
19 are placed in the mutual series-parallel one-level cold header heat exchanger 3 in described vacuum (-tight) housing 9, and described one-level cold header heat exchanger 3 is for having the dividing wall type heat exchanger of interior purifier purifying function concurrently; The raw material helium entered enters described series-parallel 19 one-level cold header heat exchangers 3 mutually by described helium air inlet pipe 1 and carries out precooling;
One radome 8 is set in described vacuum (-tight) housing 9;
M platform is placed in the condenser 5 of the parallel connection in described radome 8;
20-M platform is placed in the secondary cold header heat exchanger 4 of the mutual series connection in described radome 8; The secondary cold header heat exchanger 4 that raw material helium after the precooling of described one-level cold header heat exchanger 3 enters described mutual series connection carries out precooling again;
The condenser 5 entering described parallel connection through the raw material helium of described secondary cold header heat exchanger 4 precooling again liquefies, the liquid that obtains of liquefying confluxes and flows into liquid collecting tank 6, and is flowed into by the transfusion Dewar pipe 7 be connected with described liquid collecting tank 6 and be placed in liquid helium Dewar bottle outside described vacuum (-tight) housing 9 or liquid helium storage device;
The one-level cold head of a refrigeration machine in described 20 refrigeration machines 2 is connected with radome 8 by heat bridge, and provides cold for described radome 8; The secondary cold head of this cold-producing medium is connected by heat bridge with a described secondary cold header heat exchanger 4;
The one-level cold head of other 19 refrigeration machines in described 20 refrigeration machines 2 is connected with described one-level cold header heat exchanger 3 respectively by heat bridge, and for be separately connected one-level cold header heat exchanger cold is provided, the secondary cold head of the 20-M platform refrigeration machine in described 20 refrigeration machines 2 is connected with described secondary cold header heat exchanger 4 respectively by heat bridge, and provides cold for described secondary cold header heat exchanger; The secondary cold head of the M platform refrigeration machine in described 20 refrigeration machines 2 is connected with described condenser 5 respectively by heat bridge, and provides cold for described condenser 5.
Described one-level cold header heat exchanger 3 is dividing wall type heat exchanger, have interior purifier function concurrently, without the need to designing interior purifier in addition, raw material helium enters described one-level cold header heat exchanger 3 by described helium air inlet pipe 1 with connection in series-parallel combining form, the impurity in raw material helium is freezed, purifying helium while multi-stage precooling.
Embodiment 4:
Of the present invention with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling, N be 48 embodiment 4 comprise:
One is placed in the helium air inlet pipe 1 for the air inlet of raw material helium in vacuum (-tight) housing 9, and described raw material helium is that to be evaporated to the purity that the helium of room temperature or other approach reclaim in liquid helium bath be the helium of more than 99%;
48 refrigeration machines 2;
47 are placed in the mutual series-parallel one-level cold header heat exchanger 3 in described vacuum (-tight) housing 9, and described one-level cold header heat exchanger 3 is for having the dividing wall type heat exchanger of interior purifier purifying function concurrently; The raw material helium entered enters described series-parallel 47 one-level cold header heat exchangers 3 mutually by described helium air inlet pipe 1 and carries out precooling;
One radome 8 is set in described vacuum (-tight) housing 9;
M platform is placed in the condenser 5 of the parallel connection in described radome 8;
48-M platform is placed in the secondary cold header heat exchanger 4 of the mutual series connection in described radome 8; The secondary cold header heat exchanger 4 that raw material helium after the precooling of described one-level cold header heat exchanger 3 enters described mutual series connection carries out precooling again;
The condenser 5 entering described parallel connection through the raw material helium of described secondary cold header heat exchanger 4 precooling again liquefies, the liquid that obtains of liquefying confluxes and flows into liquid collecting tank 6, and is flowed into by the transfusion Dewar pipe 7 be connected with described liquid collecting tank 6 and be placed in liquid helium Dewar bottle outside described vacuum (-tight) housing 9 or liquid helium storage device;
The one-level cold head of a refrigeration machine in described 48 refrigeration machines 2 is connected with radome 8 by heat bridge, and provides cold for described radome 8; The secondary cold head of this cold-producing medium is connected by heat bridge with a described secondary cold header heat exchanger 4;
The one-level cold head of other 47 refrigeration machines in described 48 refrigeration machines 2 is connected with described one-level cold header heat exchanger 3 respectively by heat bridge, and for be separately connected one-level cold header heat exchanger cold is provided, the secondary cold head of the 48-M platform refrigeration machine in described 48 refrigeration machines 2 is connected with described secondary cold header heat exchanger 4 respectively by heat bridge, and provides cold for described secondary cold header heat exchanger; The secondary cold head of the M platform refrigeration machine in described 48 refrigeration machines 2 is connected with described condenser 5 respectively by heat bridge, and provides cold for described condenser 5.
Described one-level cold header heat exchanger 3 is dividing wall type heat exchanger, have interior purifier function concurrently, without the need to designing interior purifier in addition, raw material helium enters described one-level cold header heat exchanger 3 by described helium air inlet pipe 1 with connection in series-parallel combining form, the impurity in raw material helium is freezed, purifying helium while multi-stage precooling.
Although make specific descriptions to the present invention with reference to the above embodiments, but for the person of ordinary skill of the art, should be appreciated that, can to modify based on content disclosed by the invention within spirit of the present invention and scope or improve not departing from, these amendments and improving all within spirit of the present invention and scope.
Claims (3)
1. a helium liquefaction device for purifying redundancy in the band of multiple stage refrigeration machine precooling, it comprises:
One is placed in the helium air inlet pipe for the air inlet of raw material helium in vacuum (-tight) housing, and described raw material helium is the helium that the purity of the helium or the recovery of other approach being evaporated to room temperature in liquid helium bath is not less than 99%;
N platform refrigeration machine, described N is the positive integer of 3 ~ 48;
N-1 platform is placed in the mutual series-parallel one-level cold header heat exchanger in described vacuum (-tight) housing, and described one-level cold header heat exchanger is the dividing wall type heat exchanger having interior purifier purifying function concurrently; The raw material helium entered enters described mutual series-parallel N-1 platform one-level cold header heat exchanger by described helium air inlet pipe and carries out precooling;
One radome is set in described vacuum (-tight) housing;
M platform is placed in the condenser of the parallel connection in described radome, and described M is at least 1, and M is less than N;
N-M platform is placed in the secondary cold header heat exchanger of the mutual series connection in described radome; The secondary cold header heat exchanger that raw material helium after the precooling of described one-level cold header heat exchanger enters described mutual series connection carries out precooling again;
The condenser entering described parallel connection through the raw material helium of described secondary cold header heat exchanger precooling again liquefies, the liquid that obtains of liquefying confluxes inflow liquid collecting tank, and is flowed into by the transfusion Dewar pipe be connected with described liquid collecting tank and be placed in liquid helium Dewar bottle outside described vacuum (-tight) housing or liquid helium storage device;
The one-level cold head of a refrigeration machine in described N platform refrigeration machine is connected with radome by heat bridge, and provides cold for described radome; The secondary cold head of this cold-producing medium is connected by heat bridge with a described secondary cold header heat exchanger;
The one-level cold head of other refrigeration machine in described N platform refrigeration machine is connected with described one-level cold header heat exchanger respectively by heat bridge, and for be separately connected one-level cold header heat exchanger cold is provided, a part of secondary cold head of other refrigeration machine in described N platform refrigeration machine is connected with described secondary cold header heat exchanger respectively by heat bridge, and provides cold for described secondary cold header heat exchanger; Another part secondary cold head of other refrigeration machine in described N platform refrigeration machine is connected with described condenser respectively by heat bridge, and provides cold for described condenser.
2. it is characterized in that with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling by according to claim 1, described refrigeration machine is G-M refrigeration machine, pulse tube refrigerating machine, sterlin refrigerator or small-sized Cryo Refrigerator; Refrigerating capacity when described small-sized Cryo Refrigerator refers to that secondary cold head temperature is 4.2K is less than the Cryo Refrigerator of 1.5W.
3. it is characterized in that with the helium liquefaction device of purifying redundancy in the band of multiple stage refrigeration machine precooling by according to claim 1, described one-level cold header heat exchanger and secondary cold header heat exchanger are the heat exchanger that oxygen-free copper makes; Described condenser is the condenser that oxygen-free copper makes.
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| CN107560958A (en) * | 2017-09-25 | 2018-01-09 | 清华大学 | The ultralow vibration friction testing arrangement of ultralow temperature |
| CN108266966A (en) * | 2018-01-16 | 2018-07-10 | 中科睿凌江苏低温设备有限公司 | The Cryo Equipment for detaching and purifying for gas based on small-sized Cryo Refrigerator |
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