CN101008595A - Experimental equipment for testing characteristic of liquid helium filter - Google Patents
Experimental equipment for testing characteristic of liquid helium filter Download PDFInfo
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- CN101008595A CN101008595A CNA2007100367985A CN200710036798A CN101008595A CN 101008595 A CN101008595 A CN 101008595A CN A2007100367985 A CNA2007100367985 A CN A2007100367985A CN 200710036798 A CN200710036798 A CN 200710036798A CN 101008595 A CN101008595 A CN 101008595A
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Abstract
This invention relates to one helium filter property test device in low temperature engineer and technique field, which comprises oxygen steel bottle, nitrogen gas steel bottle, helium steel bottle, mixture gas pre-cooling device, gas and liquid mixture, liquid helium filter, vacuum box, heat conversion device, gas phase color spectrum, sampling valve, liquid helium Dewar, helium flow meter, nitrogen gas and oxygen flow meter. This invention adopts metal filter structure and adopts nitrogen gas and oxygen as mixture gas to lower the mixture gas pre-cooling gas temperature form roommate one to liquid nitrogen temperature.
Description
Technical field
The present invention relates to a kind of experimental equipment for testing characteristic of liquid helium filter.Particularly a kind of use nitrogen and oxygen is as foreign gas, the experimental equipment for testing characteristic of liquid helium filter that liquid helium is mixed.Belong to cryogenic engineering and cryogenic technique field.
Background technology
The method of present industrial extraction helium mainly contains condensation method, membrane separation process and diffusion method, and the method for removal small amount of impurities also comprises physisorption.For example separate for nitrogen one helium, can first condensation, then by after the charcoal absorption, the concentration of helium can bring up to 99.995%.But said method all is the purification at helium gas.And under liquid helium temperature, nearly all impurity all exists with solid-state.If earlier the vaporization of liquid helium potpourri is purified liquefaction again, then energy consumption is excessive and system is too complicated.
There are a lot of document utilization microporous properties to carry out cryogenic liquid abroad and separate, realize the purifying of cryogenic liquid.Richard A.Sauer is at " Apparatus And Method For Producing And InjectingSterile Cryogenic Liquids " ([P] in the prior art, USA:5749232, May 12,1998) use sintering ceramic filter in, utilization has the aluminium of high osmosis and high-intensity microcellular structure and makes support component, use the micropore ceramics material of multilayer to make filter medium in the passage, can filter the particulate of particle diameter, realize that " in real time " of cryogenic liquid such as liquid argon, liquid nitrogen, liquid helium etc. purified greater than 0.45 even 0.2 μ m.This is simple in structure and economical, is easy to safeguard.TakashiOgawa, Toshiro Minami use the porcelain filter in low humidity and special aperture that liquid nitrogen is purified in " Filtration Apparatus " ([P] .Japan:5271232, Dec 21,1993), remove solid impurity.The average pore size of filtering layer is 0.05 μ m to 1.0 μ m.Proof by experiment, this filtration unit can be used for the purification under the liquid nitrogen temperature, and filtrator is indeformable, fracture or stop up, and can reach desirable refining effect.
The wire gauze filtration belongs to surface filtration, the aperture that promptly relies on silk screen surface size uniformity is trapped in a side surface on the silk screen with size greater than the particle of silk screen aperture size, then flows through a kind of filter process of silk screen with fluid less than the particle of silk screen aperture size.The silk screen configuration of surface is rule evenly, and the inner duct of mesh is smooth, and this had both helped the quick formation of cake layer, was convenient to the clear separation of particle again, thereby has very excellent pulse cleaning characteristic.Adopt the filter element of wire gauze filtration mainly to comprise: protective seam, filtering layer and supporting layer, coinciding together by the tiling of 3～6 layers of braiding silk screen usually, sintering forms.The precision metallic silk screen that filtering layer adopts is the key job layer of multiple layer metal silk screen filter material; the filament of its both sides shields to filtering layer; and in sintering process, keeping the stable of micropore shape and size, the supporting network that the silk footpath is slightly, hole is bigger then is used to improve the bulk strength and the rigidity of sintering silk screen.
Along with refrigeration, cryogenic liquid transmission, cryogenic applications technology rapid development, the application of liquid helium filtrator more and more widely, its characteristic test apparatus becomes the quality of assurance liquid helium filtrator and the necessary checkout equipment of performance, obtains increasing the application in fields such as low-temperature superconducting, aerospace engineering and interplanetary probes.The performance of experimental equipment for testing characteristic of liquid helium filter directly influences the operating characteristic of liquid helium filtrator, the economy and the safe reliability of testing process.Consult the relevant document in China and foreign countries, in prior art, do not found the data of relevant " experimental equipment for testing characteristic of liquid helium filter " aspect.
Summary of the invention
In order to remedy the deficiency of prior art, the invention provides the experimental equipment for testing characteristic of liquid helium filter of a kind of nitrogen doped and oxygen, the liquid helium filtrator in the test unit adopts the wire gauze filtration.In process of the test, give liquid helium impurity gas nitrogen and oxygen, and the air and liquid mixer of use special construction, mixing stably between pure liquid helium and the impurity gas carried out, both mixed, avoided obstruction, and reduced again liquid helium face in the mixer is impacted the liquid helium loss that is caused.
The present invention is achieved through the following technical solutions.
The present invention includes oxygen bottle, the nitrogen steel cylinder, the helium steel cylinder, the oxygen reduction valve, the nitrogen reduction valve, the helium reduction valve, the helium gas flow meter, nitrogen and oxygen flow meter, helium fills valve, nitrogen and oxygen fill valve, air release, the A pressure transducer, regeneration helium gas admittance valve, the B pressure transducer, valve is propped up in the air inlet of A regeneration helium, valve is propped up in the air inlet of B regeneration helium, the foreign gas precooler, the impurity gas connecting pipe, rupture disk, vacuum gauge, air and liquid mixer, the A temperature sensor, the liquid helium filtrator, the B temperature sensor, vacuum chamber, heat interchanger, vacuum pump, vacuum pumping valve, gas chromatograph, sample valve, vent valve, exhaust flow-meter, safety valve, low-temperature joint, liquid helium Dewar, transfusion helium valve, pure liquid helium feed tube, the foreign gas combination gas distributes endless tube.Its intermediate pump is connected with vacuum chamber by vacuum pumping valve, and low-temperature joint is installed in the vacuum chamber top, and rupture disk and vacuum gauge are installed on the vacuum chamber, and foreign gas precooler, air and liquid mixer, liquid helium filtrator are installed in vacuum chamber inside.Filled with liquid nitrogen and be equipped with cooling coil in foreign gas precooler housing.The foreign gas combination gas distributes endless tube to be sleeved on periphery, air and liquid mixer cylindrical shell top, and is connected with air and liquid mixer.
Oxygen bottle and nitrogen steel cylinder be respectively by behind oxygen reduction valve, the nitrogen reduction valve and connect, and fills valve through nitrogen and oxygen flow meter, nitrogen and oxygen again and be connected with the import of foreign gas precooler inner coil pipe; The helium steel cylinder fills valve by helium reduction valve, helium gas flow meter, helium and also is connected with the import of foreign gas precooler inner coil pipe.Air release is installed on the pipeline of foreign gas precooler inflow point; Endless tube is vertical is connected by impurity gas connecting pipe and the distribution of foreign gas combination gas for foreign gas precooler outlet; Pure liquid helium feed tube one end gos deep in the vacuum chamber by low-temperature joint, inserts the simplified bottom of air and liquid mixer, and the other end is connected with the liquid helium Dewar outlet by transfusion helium valve; Impure liquid helium discharging tube one end is connected with the air and liquid mixer bottom, and the other end is connected with the liquid helium filter inlet, and the liquid helium filter outlet links to each other with the heat interchanger import; Heat exchanger exit communicates with atmosphere by vent valve, exhaust flow-meter.Gas chromatograph is installed on the heat exchanger exit pipeline by sample valve; Safety valve is positioned on the outer liquid helium filter outlet pipeline of vacuum chamber.A temperature sensor and B temperature sensor are installed in the import and export of liquid helium filtrator respectively; A pressure transducer and B pressure transducer are positioned at vacuum chamber outside, and the A pressure transducer links to each other with the liquid helium filter inlet by pipeline, and the B pressure transducer props up valve and links to each other with the liquid helium filter outlet by pipeline and the B helium air inlet of regenerating.One end of regeneration helium gas admittance valve is connected with regeneration helium air inlet source, and the other end props up valve and the B helium air inlet of regenerating and props up valve one end and be connected with the A helium air inlet of regenerating respectively; The other end that valve is propped up in the air inlet of A regeneration helium is connected with the liquid helium filter body by pipeline, and the other end that valve is propped up in the air inlet of B regeneration helium is connected with the liquid helium filter outlet by pipeline, and pure liquid helium is housed in the liquid helium Dewar.
Before on-test, open oxygen reduction valve, nitrogen reduction valve, helium reduction valve, helium and fill that valve, nitrogen and oxygen fill valve, valve, sample valve, vent valve, transfusion helium valve are propped up in the air inlet of B regeneration helium.Pure liquid helium flows in the air and liquid mixer through transfusion helium valve and low-temperature joint from liquid helium Dewar; Foreign gas oxygen and nitrogen pass through oxygen reduction valve and nitrogen reduction valve respectively in nitrogen and oxygen flow meter and nitrogen and the filled valve inflow of oxygen foreign gas precooler coil pipe, helium as the foreign gas carrier also flows in the coil pipe of foreign gas precooler by the filled valve of helium reduction valve, helium gas flow meter and helium, in the foreign gas precooler, the temperature of foreign gas combination gas is reduced near liquid nitrogen temperature from room temperature, minimizing foreign gas combination gas is brought the heat in the air and liquid mixer into, reduces the liquid helium loss.After the precooling of foreign gas precooler, distribute endless tube by impurity gas connecting pipe, foreign gas combination gas, flow in the air and liquid mixer.Nitrogen and oxygen solidify in liquid helium, form solid granulates, and foreign gas particulate solid and liquid helium mix in air and liquid mixer, mix the back and flow in the liquid helium filtrator by impure liquid helium discharging tube.The heat interchanger of flowing through of liquid helium after filtering carries out rewarming, and vent valve and the exhaust flow-meter of flowing through then discharged.In order to verify through filtering the impurity content in the helium of back, on gas exhaust duct, by sample valve exhaust is taken a sample, utilize gas chromatograph to analyze to discharging gas, if rear impurity content is lower than the requirement of liquid helium using system to impurity content in the liquid helium by analysis, illustrate that then this liquid helium filtrator can be applicable to the liquid helium using system, otherwise can not use.A temperature sensor and B temperature sensor measurement flow into and flow out the fluid temperature (F.T.) of liquid helium filtrator, and A pressure transducer and B pressure transducer are measured the hydrodynamic pressure that flows into and flow out the liquid helium filtrator.In filter process,, then need air release is opened as if the gas that needs to discharge on the gas charging line.
When the pressure differential of filtrator import and export increased to certain value, filtrator needed regeneration, promptly needed the filtrator rewarming, make solid oxygen and nitrogen particle intensification gasification attached to filter surfaces.During regeneration, oxygen reduction valve, nitrogen reduction valve, helium reduction valve, the filled valve of helium, nitrogen and the filled valve of oxygen, sample valve, vent valve, transfusion helium valve are closed.Valve is propped up in air release, regeneration helium gas admittance valve, the air inlet of A regeneration helium, the air inlet of B regeneration helium is propped up valve and is in opening.Helium is regenerated by regeneration helium gas admittance valve, A, and valve is propped up in the helium air inlet, the valve outside surface and the inside surface of inflow filter are respectively propped up in the air inlet of B regeneration helium, heat to filtrator from surfaces externally and internally, the gas after the heating flows out through air and liquid mixer, foreign gas precooler, air release.
Beneficial effect of the present invention: the present invention uses nitrogen and oxygen as foreign gas liquid helium to be mixed, and has shortened the liquid helium filtrator significantly and has reached the time that reproduced state needs; In the foreign gas precooler temperature of foreign gas combination gas is reduced near liquid nitrogen temperature from room temperature, minimizing foreign gas combination gas is brought the heat in the air and liquid mixer into, has significantly reduced the liquid helium consumption.Another characteristics of the present invention have been to use the solution-air mixer of special construction, mixing stably between pure liquid helium and the impurity gas carried out, both mixed, avoided obstruction, and reduced again liquid helium face in the mixer is impacted the liquid helium loss that is caused.
Description of drawings
Fig. 1 is an experimental equipment for testing characteristic of liquid helium filter structural representation of the present invention;
Fig. 2 is the air and liquid mixer structural representation in the experimental equipment for testing characteristic of liquid helium filter of the present invention;
Fig. 3 is the liquid helium filter structure schematic representation of experimental equipment for testing characteristic of liquid helium filter of the present invention.
1 oxygen bottle among the figure, 2 nitrogen steel cylinders, 3 helium steel cylinders, 4 oxygen reduction valve, 5 nitrogen reduction valve, 6 helium reduction valve, 7 helium gas flow meters, 8 nitrogen and oxygen flow meter, 9 helium fill valve, 10 nitrogen and oxygen fill valve, 11 air releases, the 12A pressure transducer, 13 regeneration helium gas admittance valves, the 14B pressure transducer, valve is propped up in the air inlet of 15A regeneration helium, valve is propped up in the air inlet of 16B regeneration helium, 17 foreign gas precoolers, 18 impurity gas connecting pipes, 19 rupture disks, 20 vacuum gauges, 21 air and liquid mixers, the 22A temperature sensor, 23 liquid helium filtrators, the 24B temperature sensor, 25 vacuum chambers, 26 heat interchanger, 27 vacuum pumps, 28 vacuum pumping valves, 29 gas chromatographs, 30 sample valves, 31 vent valves, 32 exhaust flow-meter, 33 safety valve, 34 low-temperature joints, 35 liquid helium Dewars, 36 transfusion helium valves, 37 pure liquid helium feed tubes, 38 air and liquid mixers lid, 39 air and liquid mixers are simplified, 40 foreign gas combination gass distribute endless tube, 41 impure liquid helium discharging tubes, 42 foreign gas combination gas draft tube, 43 liquid helium filter cylinders, 44 filter elements, 45 plectanes.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described.
As Fig. 1, Fig. 2 and shown in Figure 3 the present invention includes oxygen bottle 1, nitrogen steel cylinder 2, helium steel cylinder 3, oxygen reduction valve 4, nitrogen reduction valve 5, helium reduction valve 6, helium gas flow meter 7, nitrogen and oxygen flow meter 8, helium fills valve 9, nitrogen and oxygen fill valve 10, air release 11, A pressure transducer 12, regeneration helium gas admittance valve 13, B pressure transducer 14, valve 15 is propped up in the air inlet of A regeneration helium, valve 16 is propped up in the air inlet of B regeneration helium, foreign gas precooler 17, impurity gas connecting pipe 18, rupture disk 19, vacuum gauge 20, air and liquid mixer 21, A temperature sensor 22, liquid helium filtrator 23, B temperature sensor 24, vacuum chamber 25, heat interchanger 26, vacuum pump 27, vacuum pumping valve 28, gas chromatograph 29, sample valve 30, vent valve 31, exhaust flow-meter 32, safety valve 33, low-temperature joint 34, liquid helium Dewar 35, transfusion helium valve 36, pure liquid helium feed tube 37, the foreign gas combination gas distributes endless tube 40.Wherein oxygen bottle 1, nitrogen steel cylinder 2, helium steel cylinder 3, liquid helium Dewar 35, vacuum chamber 25, vacuum pump 27 all are placed on the ground, laboratory.Helium gas flow meter 7, nitrogen and oxygen flow meter 8, gas chromatograph 29, exhaust flow-meter 32 are placed on the experimental implementation platform.Vacuum pump 27 is connected with vacuum chamber 25 by vacuum pumping valve 28, low-temperature joint 34 is installed in vacuum chamber 25 tops, rupture disk 19 and vacuum gauge 20 are installed on the vacuum chamber 25, and foreign gas precooler 17, air and liquid mixer 21, liquid helium filtrator 23 are installed in vacuum chamber 25 inside.Filled with liquid nitrogen and be equipped with cooling coil in foreign gas precooler 17 housings.Liquid helium filtrator 23 comprises liquid helium filter cylinder 43, filter element 44, plectane 45, and liquid helium filter cylinder 43 is cylinders that two ends have end socket; Plectane 45 is annular flat boards of a center drilling, and plectane 45 places simplified 43 bottoms of liquid helium filtrator, periphery and simplified 43 welding of liquid helium filtrator; Filter element 44 adopts the wire gauze filtration, is vertically welded on the plectane 45.Air and liquid mixer 21 comprises air and liquid mixer lid 38,39,4 foreign gas combination gas draft tube 42 of air and liquid mixer cylindrical shell, air and liquid mixer lid 38 is one to have the cylinder of flange and annular groove, air and liquid mixer cylindrical shell 39 tops are cylinders, the bottom is that up big and down small turbination is simplified, and the flange portion of air and liquid mixer lid 38 welds with air and liquid mixer cylindrical shell 39 upper surfaces.The foreign gas combination gas distributes endless tube 40 to be sleeved on the periphery of air and liquid mixer cylindrical shell 39 top cylinder bodies, one end of 4 foreign gas combination gas draft tube 42 respectively by circumferentially be 90 degree at interval radially level insert in the simplified 39 top cylindrical shells of air and liquid mixer and with the cylindrical shell welding, the other end distributes endless tube 40 inboard welding with the foreign gas combination gas that is enclosed within air and liquid mixer cylindrical shell 39 peripheries respectively.The bottom is the liquid helium space in air and liquid mixer 21 divergent-cone walls, be filled with the potpourri of liquid helium and foreign gas solid granulates, upper space is gas helium space, occupy for hanging down wet helium and foreign gas, the cylinder body wall of air and liquid mixer lid 38 becomes two parts to the gas helium separated by spaces of air and liquid mixer 21, center section is the lower cold air helium space of temperature, gas helium space temperature between the inwall of the cylinder outer wall of air and liquid mixer lid 38 and the cylinder of air and liquid mixer cylindrical shell 39 is higher, and the ring vaccum groove of air and liquid mixer lid 38 plays heat-blocking action.
Before on-test, by the vacuum tightness that vacuum gauge 20 is measured in the vacuum chamber 25, the vacuum tightness in vacuum tank body 25 is lower than 5 * 10
-2During Pa, open 27 pairs of vacuum chambers 25 of vacuum pumping valve 28 unlatching vacuum pumps and vacuumize, the vacuum tightness in vacuum tank body 25 reaches 5 * 10
-2During Pa, close vacuum pump 27 and vacuum pumping valve 28.Open oxygen reduction valve 4, nitrogen reduction valve 5, helium reduction valve 6, helium then and fill that valve 9, nitrogen and oxygen fill valve 10, valve 16, sample valve 30, vent valve 31, transfusion helium valve 36 are propped up in the air inlet of B regeneration helium.Pure liquid helium is housed in the liquid helium Dewar 35, and pure liquid helium flows in the liquid helium space of air and liquid mixer 21 through transfusion helium valve 36, pure liquid helium feed tube 37 and low-temperature joint 34 from liquid helium Dewar 35; Foreign gas oxygen and nitrogen pass through oxygen reduction valve 4 and nitrogen reduction valve 5 respectively in nitrogen and oxygen flow meter 8 and nitrogen and the filled valve 10 inflow foreign gas precoolers of oxygen 17 coil pipes, helium as the foreign gas carrier also flows in the coil pipe of foreign gas precooler 17 by the filled valve 9 of helium reduction valve 6, helium gas flow meter 7 and helium, in foreign gas precooler 17, the temperature of foreign gas combination gas is reduced near liquid nitrogen temperature from room temperature, minimizing foreign gas combination gas is brought the heat in the air and liquid mixer 21 into, reduces the liquid helium loss; After 17 precoolings of foreign gas precooler, flow into the foreign gas combination gas by impurity gas connecting pipe 18 and distribute endless tube 40, and drain into equably by foreign gas combination gas draft tube 42 in the cylinder outer wall and the gas helium space between air and liquid mixer cylindrical shell 39 inwalls of air and liquid mixer lid 38, and the annular space between process air and liquid mixer lid 38 and the air and liquid mixer simplified 39 enters in the liquid helium space, nitrogen and oxygen solidify in liquid helium, form solid granulates, uncured nitrogen and oxygen enter the cold air helium space on air and liquid mixer 21 tops; Solid granulates and liquid helium that foreign gas forms mix in air and liquid mixer 21, mix the back and flow in the liquid helium filtrator 23 by impure liquid helium discharging tube 41.The heat interchanger 26 of flowing through of liquid chlorine after filtering carries out rewarming, and flow through then vent valve 31 and exhaust flow-meter 32 are discharged.In order to verify through filtering the impurity content in the helium of back, on gas exhaust duct, take a sample by 30 pairs of exhausts of sample valve, utilizing 29 pairs of gas chromatographs to discharge gas analyzes, if rear impurity content is lower than the requirement of liquid helium using system to impurity content in the liquid helium by analysis, illustrate that then this filtrator can be applicable to the liquid helium using system, otherwise can not use.A temperature sensor 22 and B temperature sensor 24 are measured the fluid temperature (F.T.) that flows into and flow out liquid helium filtrator 23, and A pressure transducer 12 and B pressure transducer 14 are measured the hydrodynamic pressure that flows into and flow out liquid helium filtrator 23.In filter process,, then need air release 11 is opened as if the gas that needs to discharge on the gas charging line.
When the pressure differential of filtrator import and export increased to certain value, filtrator needed regeneration, promptly needed the filtrator rewarming, make solid oxygen and nitrogen particle intensification gasification attached to filter surfaces.During regeneration, oxygen reduction valve 4, nitrogen reduction valve 5, helium reduction valve 6, the filled valve 9 of helium, nitrogen and the filled valve 10 of oxygen, sample valve 30, vent valve 31, transfusion helium valve 36 are closed.Valve 15 is propped up in air release 11, regeneration helium gas admittance valve 13, the air inlet of A regeneration helium, the air inlet of B regeneration helium is propped up valve 16 and is in opening.Helium is regenerated by regeneration helium gas admittance valve 13, A, and valve 15 is propped up in the helium air inlet, valve 16 outside surface and the inside surface of inflow filters are respectively propped up in the air inlet of B regeneration helium, heat to filtrator from surfaces externally and internally, the gas after the heating flows out through air and liquid mixer 21, foreign gas precooler 17, air release 11.
Claims (4)
1. experimental equipment for testing characteristic of liquid helium filter, comprise oxygen bottle (1), nitrogen steel cylinder (2), helium steel cylinder (3), oxygen reduction valve (4), nitrogen reduction valve (5), helium reduction valve (6), helium gas flow meter (7), nitrogen and oxygen flow meter (8), helium fills valve (9), nitrogen and oxygen fill valve (10), air release (11), A pressure transducer (12), regeneration helium gas admittance valve (13), B pressure transducer (14), valve (15) is propped up in the air inlet of A regeneration helium, valve (16) is propped up in the air inlet of B regeneration helium, foreign gas precooler (17), impurity gas connecting pipe (18), rupture disk (19), vacuum gauge (20), air and liquid mixer (21), A temperature sensor (22), liquid helium filtrator (23), B temperature sensor (24), vacuum chamber (25), heat interchanger (26), vacuum pump (27), vacuum pumping valve (28), gas chromatograph (29), sample valve (30), vent valve (31), exhaust flow-meter (32), safety valve (33), low-temperature joint (34), liquid helium Dewar (35), transfusion helium valve (36), pure liquid helium feed tube (37), the foreign gas combination gas distributes endless tube (40), it is characterized in that, vacuum pump (27) is connected with vacuum chamber (25) by vacuum pumping valve (28), low-temperature joint (34) is installed in vacuum chamber (25) top, rupture disk 19 and vacuum gauge (20) are installed on the vacuum chamber (25), foreign gas precooler (17), air and liquid mixer (21), liquid helium filtrator (23) is installed in the vacuum chamber (25); Filled with liquid nitrogen and be equipped with cooling coil in foreign gas precooler (17) housing, foreign gas combination gas distribute endless tube (40) to be sleeved on air and liquid mixer (21) periphery, top, and are connected with air and liquid mixer (21); Oxygen bottle (1) and nitrogen steel cylinder (2) are connected with foreign gas precooler (17) inner coil pipe import through nitrogen and the filled valve (10) of oxygen flow meter (8), nitrogen and oxygen more respectively by oxygen reduction valve (4), nitrogen reduction valve (5) back and connect; Helium steel cylinder (3) fills valve (9) by helium reduction valve (6), helium gas flow meter (7), helium and also is connected with foreign gas precooler (17) inner coil pipe import; Air release (11) is installed on the pipeline of foreign gas precooler (17) inflow point: foreign gas precooler (17) outlet distributes vertical connection of endless tube (40) by impurity gas connecting pipe (18) with the foreign gas combination gas; Pure liquid helium feed tube (37) one ends go deep in the vacuum chamber (25) by low-temperature joint (34), insert air and liquid mixer (21) bottom, and the other end is connected with liquid helium Dewar (35) outlet by transfusion helium valve (36); Impure liquid helium discharging tube (41) one ends are connected with air and liquid mixer (21) bottom, and the other end is connected with liquid helium filtrator (23) import, and liquid helium filtrator (23) outlet links to each other with heat interchanger (26) import; Heat interchanger (26) outlet communicates with atmosphere by vent valve (31), exhaust flow-meter (32); Gas chromatograph (29) is installed on heat interchanger (26) outlet conduit by sample valve (30); Safety valve (33) is positioned on outer liquid helium filtrator (23) outlet conduit of vacuum chamber (25), and A temperature sensor (22) and B temperature sensor (24) are installed in the import and export of liquid helium filtrator (23) respectively; A pressure transducer (12) is positioned at vacuum chamber (25) outside with B pressure transducer (14), A pressure transducer (12) links to each other with liquid helium filtrator (23) import by pipeline, and B pressure transducer (14) props up valve (16) by the air inlet of pipeline and B regeneration helium and exports with liquid helium filtrator (23) and link to each other; One end of regeneration helium gas admittance valve (13) is connected with regeneration helium air inlet source, the other end props up valve (15) and the B helium air inlet of regenerating with the air inlet of A regeneration helium respectively and props up valve (16) one ends and be connected, the other end that valve (15) is propped up in the air inlet of A regeneration helium is connected with liquid helium filtrator (23) housing by pipeline, and the other end that valve (16) is propped up in the air inlet of B regeneration helium is connected with liquid helium filtrator (23) outlet by pipeline.
2. experimental equipment for testing characteristic of liquid helium filter according to claim 1, it is characterized in that described liquid helium filtrator (23) comprises liquid helium filter cylinder (43), filter element (44), plectane (45), liquid helium filter cylinder (43) is the cylinder that two ends have end socket; Plectane (45) is the annular flat board of a center drilling, and plectane (45) places liquid helium filter cylinder (43) bottom, periphery and liquid helium filter cylinder (43) welding; Filter element (44) adopts the wire gauze filtration, is vertically welded on the plectane (45).
3. experimental equipment for testing characteristic of liquid helium filter according to claim 1, it is characterized in that described air and liquid mixer (21) comprises air and liquid mixer lid (38), air and liquid mixer cylindrical shell (39), 4 foreign gas combination gas draft tube (42), air and liquid mixer lid (38) is one to have the cylinder of flange and annular groove, air and liquid mixer cylindrical shell (39) top is a cylinder, the bottom is up big and down small turbination cylindrical shell, the flange portion of air and liquid mixer lid (38) and the welding of air and liquid mixer cylindrical shell (39) upper surface, one end of 4 foreign gas combination gas draft tube (42) respectively by circumferentially be 90 degree at interval radially level insert in the cylindrical shell of air and liquid mixer cylindrical shell (39) top and with the cylindrical shell welding, peripheral with being enclosed within air and liquid mixer cylindrical shell (39) the respectively foreign gas combination gas of the other end distributes that endless tube (40) is inboard to be connected.
4, experimental equipment for testing characteristic of liquid helium filter according to claim 1 is characterized in that it is to distribute endless tube (40) inboard to realize with being connected of 4 foreign gas combination gas draft tube (42) respectively by the foreign gas combination gas that described foreign gas combination gas distributes endless tube (40) and being connected of vapour-liquid mixer (21).
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