CN105445046B - A kind of refrigeration and pressure charging system for pipeline structure environmental simulation - Google Patents

A kind of refrigeration and pressure charging system for pipeline structure environmental simulation Download PDF

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CN105445046B
CN105445046B CN201410382817.XA CN201410382817A CN105445046B CN 105445046 B CN105445046 B CN 105445046B CN 201410382817 A CN201410382817 A CN 201410382817A CN 105445046 B CN105445046 B CN 105445046B
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helium
heat exchanger
level
liquid
entrance
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CN105445046A (en
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严鲁涛
李红
苏玉磊
周家屹
卞荣耀
刘玥
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China Academy of Launch Vehicle Technology CALT
Beijing Institute of Structure and Environment Engineering
Tianjin Aerospace Ruilai Technology Co Ltd
Beijing Aerostandard Technology Co Ltd
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China Academy of Launch Vehicle Technology CALT
Beijing Institute of Structure and Environment Engineering
Tianjin Aerospace Ruilai Technology Co Ltd
Beijing Aerostandard Technology Co Ltd
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Abstract

The present invention is a kind of refrigeration and pressure charging system for pipeline structure environmental simulation.Including:High-pressure helium entrance (16), level-one Recuperative heat exchanger (7), two level Recuperative heat exchanger (10), liquid nitrogen heat exchanger (8), liquid helium heat exchanger (9);Wherein, high-pressure helium entrance (16) inputs normal temperature high voltage helium, is exported after level-one Recuperative heat exchanger (7), liquid nitrogen heat exchanger (8), two level Recuperative heat exchanger (10), liquid helium heat exchanger (9) to test object successively;Test object return-air is recycled again after two level Recuperative heat exchanger (10), level-one Recuperative heat exchanger (7) successively;Liquid nitrogen recycles after liquid nitrogen heat exchanger (8), and liquid helium is recycled after liquid helium heat exchanger (9), two level Recuperative heat exchanger (10), level-one Recuperative heat exchanger (7) successively.Can simulated pressure and low temperature integrated environment, can also simulated high-pressure, low temperature, cooling, heating actual environment.

Description

A kind of refrigeration and pressure charging system for pipeline structure environmental simulation
Technical field
The invention belongs to utilize liquid nitrogen and liquid helium multi-stage refrigerating and its control method, available for structures such as pipeline, housing, cabins Pressure and low temperature environment simulation, belong to refrigerant system design and control technical field.
Background technology
Pipe-line system be pipe, pipe connections, valve and pipeline support etc. connect into for conveying gas, liquid or with solid The device of the fluid of body particle.With the rapid development of China's industry, pipe-line system be applied to more and more widely plumbing, In the various commercial plants such as heat supply, gas supply, long distance delivery, agricultural irrigation, hydraulic engineering.In aerospace field, engine Pipeline is mainly used for the conveying of the media such as hydraulic oil, fuel, lubricating oil and air, is the important composition portion of engine accessory power rating device Point.The cryogenic liquid of condition (certain temperature, pressure, flow etc.) needed for cryogenic pipe to outlet offer, in LNG ship oceangoing ship, liquid Propellant rocket and its ground loading system, spacecraft space environmental simulation equipment etc. are widely used in fields.
Due to the use of the influence of the external environments acute variation such as the vibration of environment and temperature, pressure, these integrated environments Often cause pipe-line system that various vibration faults or even the destruction for causing pipeline often occurs and causes serious thing Therefore.Therefore, it first has to consider comprehensively the characteristic of pipe-line system in the design phase of pipe-line system, and verifies the hand of design rationality Section is exactly to simulate true working environment, and carry out environmental test.Result of the test will directly expose design defect, will be more effective Design, therefore pipeline environment simulation system implementation have very big theory value and practical meaning in engineering.
The present invention provides a kind of refrigeration and pressure charging system for pipeline structure environmental simulation, with cycle helium to testpieces It is cooled down and is pressurized, refrigeration can meet low-temperature space more than liquid nitrogen temperature and the profound hypothermia area below liquid nitrogen temperature, press Power is adjusted.For profound hypothermia area, the present invention makes full use of the cold that liquid helium exports and test object exports, uses the technology of rising again Liquid helium usage amount is reduced, and improves refrigerating efficiency.
Invention content
The object of the present invention is to provide a kind of refrigeration and pressure charging system for pipeline structure environmental simulation, with cycle helium Testpieces is cooled down and is pressurized, refrigeration can meet low-temperature space more than liquid nitrogen temperature and the depth below liquid nitrogen temperature Low-temperature space, pressure adjustable section.In addition, a kind of refrigeration and pressure charging system for pipeline structure environmental simulation provided by the invention is also Available for cavity, storage tank, the isostructural working environment simulation in cabin.
The present invention is a kind of refrigeration and pressure charging system for pipeline structure environmental simulation, wherein, including:High-pressure helium enters Mouth, level-one Recuperative heat exchanger, two level Recuperative heat exchanger, liquid nitrogen heat exchanger, liquid helium heat exchanger;Wherein, high-pressure helium entrance inputs Normal temperature high voltage helium, successively after level-one Recuperative heat exchanger, liquid nitrogen heat exchanger, two level Recuperative heat exchanger, liquid helium heat exchanger It exports to test object;Test object return-air carries out again after two level Recuperative heat exchanger, level-one Recuperative heat exchanger successively Cycle;Liquid nitrogen recycles after liquid nitrogen heat exchanger, and liquid helium is successively by liquid helium heat exchanger, two level Recuperative heat exchanger, level-one backheat It is recycled after heat exchanger;
Wherein, level-one Recuperative heat exchanger is tentatively pre- by normal temperature circulation helium using the cold of liquid helium and test object return-air Cold, two level Recuperative heat exchanger utilizes liquid helium outlet and the further cooling cycle helium of test object return-air cold;Liquid nitrogen heat exchanger For recycling the heat exchange of helium and liquid nitrogen, liquid helium heat exchanger is used to recycle the heat exchange of helium and liquid helium.
A kind of refrigeration and pressure charging system for pipeline structure environmental simulation as described above, wherein, it further includes:Helium follows Ring pumps;Surge tank shut-off valve;Surge tank;By-passing valve;Room temperature intake valve;Room temperature return-air valve;Main road flowmeter;Bypass flow meter; Helium air bleeding valve;
Low temperature air inlet valve;Low temperature return-air valve;Inlet temperature;Inlet pressure;Outlet temperature;Air bleeding valve;High-pressure helium entrance; High pressure helium air valve;Liquid nitrogen valve;Liquid nitrogen entrance;Liquid nitrogen exports;Liquid helium valve;Liquid helium entrance;Liquid helium exports;Helium recovery unit;
Also, level-one Recuperative heat exchanger includes:Level-one Recuperative heat exchanger liquid helium entrance;Level-one Recuperative heat exchanger liquid helium goes out Mouthful;Level-one Recuperative heat exchanger room temperature helium entrance;Level-one Recuperative heat exchanger room temperature helium exports;Level-one Recuperative heat exchanger recycles helium Gas return air inlet;Level-one Recuperative heat exchanger recycles helium return air outlet;
Liquid nitrogen heat exchanger includes:Liquid nitrogen heat exchanger helium entrance;Liquid nitrogen heat exchanger helium exports;Liquid nitrogen heat exchanger liquid nitrogen enters Mouthful;Liquid nitrogen heat exchanger liquid nitrogen exports;
Liquid helium heat exchanger includes:Liquid helium heat exchanger liquid helium entrance;Liquid helium heat exchanger liquid helium exports;Liquid helium heat exchanger helium enters Mouthful;Liquid helium heat exchanger helium exports;
Two level Recuperative heat exchanger includes:Two level Recuperative heat exchanger liquid helium entrance;Two level Recuperative heat exchanger liquid helium exports;Two level Recuperative heat exchanger helium entrance;Two level Recuperative heat exchanger helium exports;Two level Recuperative heat exchanger recycles helium return air inlet;Two level Recuperative heat exchanger recycles helium return air outlet;
Wherein, circulated helium pump is power source;Helium is recycled through liquid nitrogen heat exchanger and liquid helium heat exchanger by liquid nitrogen and liquid helium The cold of generation is brought to test object;Circulated helium pumps helium to be driven to recycle in pipeline and test object, and exchange liquid The cold of nitrogen and liquid helium cools down test object;
Surge tank stablizes the flow of circulated helium pump generation and the pulsation of pressure;The upper end of surge tank is provided with high-pressure helium Valve and high-pressure helium entrance, for the input of high-pressure helium;The lower end of surge tank is provided with surge tank shut-off valve;
The level-one Recuperative heat exchanger, liquid nitrogen heat exchanger, liquid helium heat exchanger, two level Recuperative heat exchanger are integrated in Dewar It is interior;
Circulated helium pump discharge is connected with surge tank shut-off valve, room temperature intake valve, bypass flow meter, surge tank shut-off valve The other end is connected with surge tank, and high pressure helium air valve is connected to surge tank and high-pressure helium entrance;
Room temperature intake valve is connected to circulated helium pump and main road flowmeter, and one in the other end and Dewar of main road flowmeter Level-one Recuperative heat exchanger room temperature helium entrance on grade Recuperative heat exchanger is connected, the outlet of level-one Recuperative heat exchanger room temperature helium and liquid Nitrogen heat exchanger helium entrance connects, and the outlet of liquid nitrogen heat exchanger helium is connected with two level Recuperative heat exchanger helium entrance, two level backheat The outlet of heat exchanger helium is connected with liquid helium heat exchanger helium entrance;Low temperature air inlet valve both ends are connected to liquid helium heat exchanger helium respectively Outlet and inlet temperature and inlet pressure test point;Low temperature return-air valve is connected to test object exhaust outlet and two level Recuperative heat exchanger Recycle helium return air inlet;Two level Recuperative heat exchanger recycles helium return air outlet and enters with level-one Recuperative heat exchanger cycle helium return-air Mouth is connected, and level-one Recuperative heat exchanger cycle helium return air outlet is connected with room temperature return-air valve and air bleeding valve;Recycle returning for helium pump Gas port is connected with by-passing valve and by-passing valve;The by-passing valve other end is connected to bypass flow meter;
For liquid helium circuit, liquid helium valve both ends connection liquid helium entrance and liquid helium heat exchanger liquid helium entrance, liquid helium heat exchanger liquid Helium out connects two level Recuperative heat exchanger liquid helium entrance, and the outlet of two level Recuperative heat exchanger liquid helium enters with level-one Recuperative heat exchanger liquid helium Mouth is connected, and helium air bleeding valve is connected to the outlet of level-one Recuperative heat exchanger liquid helium and liquid helium outlet, and liquid helium outlet is arranged on helium time On receiving apparatus;
Cycle helium in system is provided with two branches, monitors helium using main road flowmeter and bypass flow meter respectively Flow;Helium is used to carry the cold cooling test object of liquid nitrogen and liquid helium in main road, and main road total flow can be other by adjusting Port valve is adjusted;
The cycle helium of main road is expressed as follows:The high-pressure helium generated by circulated helium pump is adjusted through room temperature intake valve presses Power, and flow is shown by main road flowmeter, enter level-one Recuperative heat exchanger from level-one Recuperative heat exchanger room temperature helium entrance, from one Enter liquid nitrogen heat exchanger through liquid nitrogen heat exchanger helium entrance after the outlet discharge of grade Recuperative heat exchanger room temperature helium fully to change with liquid nitrogen Heat;Cycle helium enters the heat exchange of two level backheat after liquid nitrogen heat exchanger helium outlet discharge through two level Recuperative heat exchanger helium entrance Device, and enter liquid helium heat exchanger through liquid helium heat exchanger helium entrance by two level Recuperative heat exchanger helium outlet discharge;It is changed from liquid helium The cycle helium of hot device helium outlet discharge enters test object, and monitor inlet temperature and entrance after the adjustment of low temperature air inlet valve Pressure;The cycle helium of test object discharge recycles helium return air inlet after the adjustment of low temperature return-air valve through two level Recuperative heat exchanger Into two level Recuperative heat exchanger and by the cycle helium return air outlet discharge of two level Recuperative heat exchanger;Hereafter, cycle helium is through level-one Recuperative heat exchanger cycle helium return air inlet enters level-one Recuperative heat exchanger and exchanges heat with initial cycle helium;It is changed from level-one backheat Circulated helium pump is back to through room temperature return-air valve complete cycle after hot device cycle helium return air outlet discharge;
The circulated helium of bypass is expressed as follows:The high-pressure helium part generated by circulated helium pump is after by-passing valve adjusts Circulated helium pump is directly back to, this road flow is monitored by bypass flow meter.
The present invention proposes a kind of refrigeration and pressure charging system for pipeline structure environmental simulation, the advantage is that, system makes It is pressurized with liquid nitrogen and liquid helium two-stage refrigeration, and by high-pressure helium, plays pressure stabilization function using surge tank in system, pressure can be simulated The integrated environment of power and low temperature, can also simulated high-pressure, low temperature, cooling, the actual environment to heat up.System is provided with main road and branch Road can adjust main road flow by by-passing valve, realize the purpose for adjusting the test object temperature difference.There is provided level-one backheats to change for system Hot device, two level Recuperative heat exchanger make full use of the cold of rising again of cycle helium in liquid helium and test specimen, and cycle helium is tentatively made It is cold, it realizes and reduces liquid helium dosage, and improve the purpose of refrigerating efficiency.
Description of the drawings
Fig. 1 is used for the refrigeration of pipeline structure environmental simulation and pressure charging system principle;
Fig. 2 low-temperature space environmental simulation flows;
Fig. 3 profound hypothermias area's environmental simulation flow.
1 circulated helium pumps;2 surge tank shut-off valves;3 surge tanks;4 by-passing valves;4a room temperature intake valves;4b room temperature return-air valves; 5a main road flowmeters;5b bypass flow meters;6 helium air bleeding valves;7 level-one Recuperative heat exchangers;7a level-one Recuperative heat exchanger liquid heliums enter Mouthful;7b level-one Recuperative heat exchangers liquid helium exports;7c level-one Recuperative heat exchanger room temperature helium entrances;7d level-one Recuperative heat exchanger room temperature Helium exports;7e level-ones Recuperative heat exchanger recycles helium return air inlet;7f level-ones Recuperative heat exchanger recycles helium return air outlet;8 Liquid nitrogen heat exchanger;8a liquid nitrogen heat exchanger helium entrances;8b liquid nitrogen heat exchangers helium exports;8c liquid nitrogen heat exchanger liquid nitrogen entrances;8d Liquid nitrogen heat exchanger liquid nitrogen exports;9 liquid helium heat exchangers;9a liquid helium heat exchanger liquid helium entrances;9b liquid helium heat exchangers liquid helium exports;9c liquid Helium heat exchanger helium entrance;9d liquid helium heat exchangers helium exports;10 two level Recuperative heat exchangers;10a two level Recuperative heat exchanger liquid heliums Entrance;10b two level Recuperative heat exchangers liquid helium exports;10c two level Recuperative heat exchanger helium entrances;10d two level Recuperative heat exchanger helium Gas exports;10e two levels Recuperative heat exchanger recycles helium return air inlet;10f two levels Recuperative heat exchanger recycles helium return air outlet; 11a low temperature air inlet valves;11b low temperature return-air valves;12 inlet temperatures;13 inlet pressures;14 outlet temperatures;15 air bleeding valves;16 high pressures Helium entrance;16a high pressure helium air valves;17 liquid nitrogen valves;18a liquid nitrogen entrances;18b liquid nitrogen exports;19 liquid helium valves;20a liquid helium entrances; 20b liquid heliums export;21 helium recovery units.
Specific embodiment
The present invention is described further with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of refrigeration and pressure charging system for pipeline structure environmental simulation, using cycle helium to experiment Part is cooled down and is pressurized, and can realize that the depth more than following liquid helium region of low-temperature space and liquid nitrogen temperature more than liquid nitrogen temperature is low Warm area, and realize the accurate adjusting of pressure.
Including circulated helium pump 1;Surge tank shut-off valve 2;Surge tank 3;By-passing valve 4;Room temperature intake valve 4a;Room temperature return-air valve 4b;Main road flowmeter 5a;Bypass flow meter 5b;Helium air bleeding valve 6;Level-one Recuperative heat exchanger 7;Level-one Recuperative heat exchanger liquid helium enters Mouth 7a;Level-one Recuperative heat exchanger liquid helium exports 7b;Level-one Recuperative heat exchanger room temperature helium entrance 7c;Level-one Recuperative heat exchanger room temperature Helium exports 7d;Level-one Recuperative heat exchanger cycle helium return air inlet 7e;Level-one Recuperative heat exchanger cycle helium return air outlet 7f; Liquid nitrogen heat exchanger 8;Liquid nitrogen heat exchanger helium entrance 8a;Liquid nitrogen heat exchanger helium exports 8b;Liquid nitrogen heat exchanger liquid nitrogen entrance 8c;Liquid Nitrogen heat exchanger liquid nitrogen exports 8d;Liquid helium heat exchanger 9;Liquid helium heat exchanger liquid helium entrance 9a;Liquid helium heat exchanger liquid helium exports 9b;Liquid helium Heat exchanger helium entrance 9c;Liquid helium heat exchanger helium exports 9d;Two level Recuperative heat exchanger 10;Two level Recuperative heat exchanger liquid helium entrance 10a;Two level Recuperative heat exchanger liquid helium exports 10b;Two level Recuperative heat exchanger helium entrance 10c;Two level Recuperative heat exchanger helium goes out Mouth 10d;Two level Recuperative heat exchanger cycle helium return air inlet 10e;Two level Recuperative heat exchanger cycle helium return air outlet 10f;It is low Warm intake valve 11a;Low temperature return-air valve 11b;Inlet temperature 12;Inlet pressure 13;Outlet temperature 14;Air bleeding valve 15;High-pressure helium Entrance 16;High pressure helium air valve 16a;Liquid nitrogen valve 17;Liquid nitrogen entrance 18a;Liquid nitrogen exports 18b;Liquid helium valve 19;Liquid helium entrance 20a;Liquid Helium out 20b;Helium recovery unit 21.
Wherein, circulated helium pump 1 is power source, makes helium that fluid resistance be overcome to be recycled in pipeline, and realize requirement Flow.Cycle helium brings the cold that liquid nitrogen and liquid helium generate to test object through liquid nitrogen heat exchanger 8 and liquid helium heat exchanger 9.Helium Gas circulating pump 1 exchanges the cold cooling test pair of liquid nitrogen and liquid helium for helium to be driven to be recycled in pipeline and test object As.
Surge tank 3 be used for stablize circulated helium pump 1 generate flow and pressure pulsation, also to system boost, be depressured Journey plays cushioning effect, and pressure and flow is made not to generate mutation.The upper end of surge tank 3 is provided with high pressure helium air valve 16a and high pressure Helium entrance 16 for the input of high-pressure helium, realizes the purpose of supercharging.The lower end of surge tank 3 is provided with surge tank shut-off valve 2, when closing surge tank shut-off valve 2 after the test, the helium in surge tank 3 can be stored, in case next time, experiment used, it is main Syllabus is the usage amount for saving helium, and shorten the time of gas displacement in pipeline.Surge tank 3 is compressible and swollen using gas Swollen characteristic, alternate storage or release, achieve the purpose that reduce flow and pressure fluctuation in pipeline.
To reduce system leakage heat, the level-one Recuperative heat exchanger 7, liquid nitrogen heat exchanger 8, liquid helium heat exchanger 9, two level backheat Heat exchanger 10 is integrated in Dewar.
Normal temperature circulation helium is tentatively pre-chilled using the cold of liquid helium and test object return-air for level-one Recuperative heat exchanger 7, and two Grade Recuperative heat exchanger 10 utilizes liquid helium outlet and the further cooling cycle helium of test object return-air cold.Liquid nitrogen heat exchanger is used for The heat exchange of helium and liquid nitrogen is recycled, liquid helium heat exchanger is used to recycle the heat exchange of helium and liquid helium.
Level-one Recuperative heat exchanger 7 is provided with level-one Recuperative heat exchanger liquid helium entrance 7a, level-one Recuperative heat exchanger liquid helium exports 7b, level-one Recuperative heat exchanger room temperature helium entrance 7c, level-one Recuperative heat exchanger room temperature helium outlet 7d, level-one Recuperative heat exchanger follow Ring helium return air inlet 7e, level-one Recuperative heat exchanger cycle helium return air outlet 7f;
Liquid nitrogen heat exchanger 8 is provided with liquid nitrogen heat exchanger helium entrance 8a, liquid nitrogen heat exchanger helium outlet 8b, liquid nitrogen heat exchanger Liquid nitrogen entrance 8c, liquid nitrogen heat exchanger liquid nitrogen outlet 8d;
Liquid helium heat exchanger 9 is provided with liquid helium heat exchanger liquid helium entrance 9a, liquid helium heat exchanger liquid helium outlet 9b, liquid helium heat exchanger Helium entrance 9c, liquid helium heat exchanger helium outlet 9d;
Two level Recuperative heat exchanger 10 is provided with two level Recuperative heat exchanger liquid helium entrance 10a, two level Recuperative heat exchanger liquid helium goes out Mouth 10b, two level Recuperative heat exchanger helium entrance 10c, two level Recuperative heat exchanger helium outlet 10d, two level Recuperative heat exchanger cycle Helium return air inlet 10e, two level Recuperative heat exchanger cycle helium return air outlet 10f.
1 outlet of circulated helium pump is connected with surge tank shut-off valve 2, room temperature intake valve 4a, bypass flow meter 5b, and surge tank is cut Only the other end of valve 2 is connected with surge tank 3, and high pressure helium air valve 16a is connected to surge tank 3 and high-pressure helium entrance 16.
Room temperature intake valve 4a is connected to circulated helium pump 1 and main road flowmeter 5a, the other end of main road flowmeter 5a and Du Level-one Recuperative heat exchanger room temperature helium entrance 7c on level-one Recuperative heat exchanger 7 in watt is connected, level-one Recuperative heat exchanger room temperature Helium outlet 7d is connected with liquid nitrogen heat exchanger helium entrance 8a, liquid nitrogen heat exchanger helium outlet 8b and two level Recuperative heat exchanger helium Entrance 10c is connected, and two level Recuperative heat exchanger helium outlet 10d is connected with liquid helium heat exchanger helium entrance 9c.Low temperature air inlet valve 11a Both ends are connected to liquid helium heat exchanger helium outlet 9d and 13 test point of inlet temperature 12 and inlet pressure respectively.Low temperature return-air valve 11b is connected to test object exhaust outlet and two level Recuperative heat exchanger cycle helium return air inlet 10e.Two level Recuperative heat exchanger recycles Helium return air outlet 10f is connected with level-one Recuperative heat exchanger cycle helium return air inlet 7e, level-one Recuperative heat exchanger cycle helium Return air outlet 7f is connected with room temperature return-air valve 4b and air bleeding valve 15.Recycle the gas returning port of helium pump 1 and by-passing valve 4 and by-passing valve 4 It is connected.4 other end of by-passing valve is connected to bypass flow meter 5b.
For liquid helium circuit, 19 both ends of liquid helium valve connection liquid helium entrance 20a and liquid helium heat exchanger liquid helium entrance 9a, liquid helium change Hot device liquid helium exports 9b connection two level Recuperative heat exchanger liquid helium entrance 10a, and two level Recuperative heat exchanger liquid helium outlet 10b is returned with level-one Heat exchanger liquid helium entrance 7a is connected, and helium air bleeding valve 6 is connected to level-one Recuperative heat exchanger liquid helium outlet 7b and liquid helium outlet 20b, liquid helium outlet 20b are arranged on helium recovery unit 21.
Cycle helium in system is provided with two branches, is monitored respectively using main road flowmeter 5a and bypass flow meter 5b Helium gas flow.Helium is used to carry the cold cooling test object of liquid nitrogen and liquid helium in main road, and main road total flow can pass through tune Section by-passing valve 4 is adjusted.
The cycle helium of main road is expressed as follows:The high-pressure helium generated by circulated helium pump 1 is adjusted through room temperature intake valve 4a Pressure, and flow is shown by main road flowmeter 5a, enter the heat exchange of level-one backheat from level-one Recuperative heat exchanger room temperature helium entrance 7c Device 7 enters liquid nitrogen heat exchanger 8 after level-one Recuperative heat exchanger room temperature helium outlet 7d discharges through liquid nitrogen heat exchanger helium entrance 8a It fully exchanges heat with liquid nitrogen.Helium is recycled after liquid nitrogen heat exchanger helium outlet 8b discharges through two level Recuperative heat exchanger helium entrance 10c enters two level Recuperative heat exchanger 10, and by two level Recuperative heat exchanger helium outlet 10d discharges through liquid helium heat exchanger helium entrance 9c enters liquid helium heat exchanger 9.It is laggard in low temperature air inlet valve 11a adjustment from the cycle helium of liquid helium heat exchanger helium outlet 9d discharges Enter test object, and monitor inlet temperature 12 and inlet pressure 13.The cycle helium of test object discharge is through low temperature return-air valve 11b Enter two level Recuperative heat exchanger 10 through two level Recuperative heat exchanger cycle helium return air inlet 10e after adjustment and exchanged heat by two level backheat Device cycle helium return air outlet 10f discharges.Hereafter, cycle helium enters through level-one Recuperative heat exchanger cycle helium return air inlet 7e Level-one Recuperative heat exchanger 7 exchanges heat with initial cycle helium.After the cycle helium return air outlet 7f discharges of level-one Recuperative heat exchanger Circulated helium pump 1, which is back to, through room temperature return-air valve 4b completes cycle.
The circulated helium of bypass is expressed as follows:The high-pressure helium part generated by circulated helium pump 1 is adjusted through by-passing valve 4 It is directly back to circulated helium pump 1 afterwards, this road flow is monitored by bypass flow meter 5b.
Liquid nitrogen injection embodiment is as follows:Liquid nitrogen is entered by liquid nitrogen entrance 18a, and adjusts flow through liquid nitrogen valve 17, is passed through Liquid nitrogen heat exchanger liquid nitrogen entrance 8c enters liquid nitrogen heat exchanger 8, and in liquid nitrogen heat exchanger 8, liquid nitrogen fully exchanges heat with cycle helium.Liquid Nitrogen endothermic gasification exports 8d through liquid nitrogen heat exchanger liquid nitrogen and exports 18b discharges by liquid nitrogen.
Liquid helium injection embodiment is as follows:Liquid helium enters pipeline by liquid helium entrance 20a, and flow is adjusted through liquid helium valve 19, by Liquid helium heat exchanger liquid helium entrance 9a enters liquid helium heat exchanger 9.In liquid helium heat exchanger 9, liquid helium and cycle helium sufficient heat exchange. Helium is recycled by liquid helium heat exchanger liquid helium outlet 9b discharges, enters two level backheat by two level Recuperative heat exchanger liquid helium entrance 10a Heat exchanger 10, in two level Recuperative heat exchanger 10, recycle the return-air of helium with the discharge gas of liquid helium with cycle helium Air inlet heat exchange.It recycles after helium is discharged by two level Recuperative heat exchanger liquid helium outlet 10b through level-one Recuperative heat exchanger liquid helium entrance 7a enters level-one Recuperative heat exchanger 7, by being adjusted after level-one Recuperative heat exchanger liquid helium outlet 7b discharges through helium air bleeding valve 6, and by Liquid helium outlet 20b enters helium recovery unit 21.The flow of liquid helium can be adjusted by liquid helium valve 19 and helium air bleeding valve 6.
The pressure of pressure namely cycle helium inside test object can jointly be adjusted by high-pressure helium and air bleeding valve, When cycle helium pressure is relatively low, high-pressure helium enters through high-pressure helium entrance, and enters after high-pressure helium pressure regulating valve Surge tank enters cycle helium pipeline after voltage stabilizing through surge tank shut-off valve.When cycle helium pressure is higher, air bleeding valve row is opened Gas, and the inlet pressure of monitoring and test object after reaching desired value, close air bleeding valve.Because of the pressure stabilization function of surge tank, entirely Adjustment process, pressure and flow change more steady.
Temperature inside test object, the low-temperature space and the following liquid helium temperature of liquid nitrogen temperature being divided into more than liquid nitrogen temperature Above profound hypothermia area.When needing the temperature environment simulated for low-temperature space environment, then close liquid helium valve and stop liquid helium supply, it is only necessary to Liquid nitrogen provides cold.Then liquid helium is needed to supply for profound hypothermia area environment when needing the temperature environment simulated.
The process simulated is summarized as follows first:
(1) gas displacement in pipeline:It is pressurized after the experiment preparation stage by high-pressure helium entrance until increasing to displacement Pressure, voltage stabilizing detect whether vacuum degree reaches requirement for a period of time afterwards by being vented valve exhaust, after exhaust, if not up to Then pressurising and being vented is repeated the above process until reach vacuum level requirements again.
(2) system boost:It is pressurized by helium entrance until increasing to the goal pressure of test requirements document, and pass through inlet pressure Monitoring, then continues pressurising if the goal pressure for reaching test requirements document, passes through air bleeding valve exhaust decompression if being more than goal pressure.
(3) system cools down:Liquid nitrogen is added in by liquid nitrogen entrance, starts cycle helium pump, cycle helium is in liquid nitrogen heat exchanger Interior and liquid nitrogen heat exchange, cycle helium bring cold into test object.
When experiment is the simulation of profound hypothermia area, after above-mentioned temperature is down to liquid nitrogen temperature, liquid helium is entered by liquid helium entrance Pipeline, cycle helium exchange heat with liquid helium in liquid helium heat exchanger, and cycle helium brings the cold of liquid helium into test object.When experiment is When low-temperature space is simulated, then the operation of above-mentioned liquid helium supply is not needed to.
Because in the process cycle helium be cooled volume reduction, pressure reduction, when inlet pressure detects pressure reduction, lead to The supercharging of high-pressure helium entrance is crossed until inlet temperature and inlet pressure reach test requirements document.
(4) the entrance temperature difference adjusts:By inlet pressure and the entrance temperature difference of outlet pressure monitoring and test object, work as temperature When degree difference is larger, adjusts by-passing valve and monitor main road flowmeter, with the entrance temperature difference of the increase test object of main road flow Reduce, until reaching test requirements document.
(5) after experiment reaches and want seeking time, surge tank shut-off valve is closed, stops circulated helium and pumps, by being vented valve exhaust Decompression, test object are risen again naturally, off-test.
The present invention proposes a kind of refrigeration and pressure charging system for pipeline structure environmental simulation, the advantage is that, system makes It is pressurized with liquid nitrogen and liquid helium two-stage refrigeration, and by high-pressure helium, plays pressure stabilization function using surge tank in system, pressure can be simulated The integrated environment of power and low temperature, can also simulated high-pressure, low temperature, cooling, the actual environment to heat up.System is provided with main road and branch Road can adjust main road flow by by-passing valve, realize the purpose for adjusting the test object temperature difference.There is provided level-one backheats to change for system Hot device, two level Recuperative heat exchanger make full use of the cold of rising again of cycle helium in liquid helium and test specimen, and cycle helium is tentatively made It is cold, it realizes and reduces liquid helium dosage, and improve the purpose of refrigerating efficiency.
Detailed process is described as follows:
Low-temperature space environmental simulation flow is with reference to Fig. 2:
(1) it tests the preparation stage, at the external air source, liquid nitrogen entrance 18a at connecting test object, high-pressure helium entrance 16 Liquid nitrogen source, liquid helium entrance 20a liquid helium, confirm main road flowmeter 5a, bypass flow meter 5b, 12 sensor of inlet temperature, enter 13 sensor of mouth pressure, 14 normal operation of sensor of outlet temperature.
(2) high-pressure helium is injected by high-pressure helium entrance 16, and enters surge tank after passing through high pressure helium air valve 16a adjustment 3, circulation line is entered by surge tank shut-off valve 2, realizes the supercharging of replacement process.Pass through inlet pressure 13 during being somebody's turn to do and monitor pressure Power when pressure is more than goal pressure, is opened air bleeding valve 15 and is vented.After pressure increases to displacement pressure, high pressure helium air valve is closed 16a, steady pressure for a period of time, after no pressure variation, are opened air bleeding valve 15 and are vented.Vacuum degree is detected after pressure release, such as not up to Vacuum level requirements are then pressurized and are vented again, until reaching vacuum level requirements.
(3) high-pressure helium is injected by high-pressure helium entrance 16, realizes the supercharging of process of refrigerastion.It is supervised by inlet pressure 13 Measuring pressure when pressure is more than goal pressure, is opened air bleeding valve 15 and is vented.Liquid nitrogen is entered by liquid nitrogen entrance 18a, and through liquid nitrogen valve 17 adjustment flows, enter liquid nitrogen heat exchanger 8 by liquid nitrogen heat exchanger liquid nitrogen entrance 8c, are exported after gasification by liquid nitrogen heat exchanger liquid nitrogen 8d is simultaneously discharged through liquid nitrogen outlet 18b.
(4) start circulated helium pump 1, cycle helium fully exchanges heat, and it is cold to carry cold in liquid nitrogen heat exchanger 8 with liquid nitrogen But liquid helium heat exchanger 9, test object, two level Recuperative heat exchanger 10 and level-one Recuperative heat exchanger 7.Since temperature reduces, helium is recycled The pressure of gas will decrease, and be monitored according to inlet pressure 13, when pressure decreases, inject high pressure by high-pressure helium entrance 16 Helium steady pressure.According to 12 monitoring temperature of inlet temperature until temperature is down to desired value.When inlet temperature 12 is higher than target temperature When spending, the aperture of liquid nitrogen valve 17 is increased, increases liquid nitrogen flow;When inlet temperature 12 is less than target temperature, reduce liquid nitrogen valve 17 Aperture, reduce liquid nitrogen flow.
According to the entrance temperature difference requirement of test object, the temperature difference is tested by inlet temperature 12 and outlet temperature 14.Work as survey When trying the temperature difference more than target temperature difference, reduce the aperture of by-passing valve 4, increase main road flow (can be monitored by main road flowmeter 5a), Until the test temperature difference reaches target temperature difference.When testing the temperature difference less than target temperature difference, increase the aperture of by-passing valve 4, reduce main road Flow (can be monitored) by main road flowmeter 5a, increase bypass flow (can be monitored by bypass flow meter 5b), until test temperature Difference reaches target temperature difference.According to test requirements document, the requirement of temperature, pressure, the temperature difference is maintained, completes test period, until experiment knot Beam.
(5) after the test, 15 exhaust decompression of air bleeding valve is opened, test object is risen again, supervised by inlet temperature 12 naturally It surveys, until test object rises to natural temperature.
Environmental simulation flow in profound hypothermia area is with reference to Fig. 3:
(1) it tests the preparation stage, at the external air source, liquid nitrogen entrance 18a at connecting test object, high-pressure helium entrance 16 Liquid nitrogen source, liquid helium entrance 20a liquid helium, confirm main road flowmeter 5a, bypass flow meter 5b, 12 sensor of inlet temperature, enter 13 sensor of mouth pressure, 14 normal operation of sensor of outlet temperature.
(2) high-pressure helium is injected by high-pressure helium entrance 16, and enters surge tank after passing through high pressure helium air valve 16a adjustment 3, circulation line is entered by surge tank shut-off valve 2, realizes the supercharging of replacement process.Pass through inlet pressure 13 during being somebody's turn to do and monitor pressure Power when pressure is more than goal pressure, is opened air bleeding valve 15 and is vented.After pressure increases to displacement pressure, high pressure helium air valve is closed 16a, steady pressure for a period of time, after no pressure variation, are opened air bleeding valve 15 and are vented.Vacuum degree is detected after pressure release, such as not up to Vacuum level requirements are then pressurized and are vented again, until reaching vacuum level requirements.
(3) high-pressure helium is injected by high-pressure helium entrance 16, realizes the supercharging of process of refrigerastion.It is supervised by inlet pressure 13 Measuring pressure when pressure is more than goal pressure, is opened air bleeding valve 15 and is vented.Liquid nitrogen is entered by liquid nitrogen entrance 18a, and through liquid nitrogen valve 17 adjustment flows, enter liquid nitrogen heat exchanger 8 by liquid nitrogen heat exchanger liquid nitrogen entrance 8c, are exported after gasification by liquid nitrogen heat exchanger liquid nitrogen 8d is simultaneously discharged through liquid nitrogen outlet 18b.
(4) start circulated helium pump 1, cycle helium fully exchanges heat, and it is cold to carry cold in liquid nitrogen heat exchanger 8 with liquid nitrogen But liquid helium heat exchanger 9, test object, two level Recuperative heat exchanger 10 and level-one Recuperative heat exchanger 7.Since temperature reduces, helium is recycled The pressure of gas will decrease, and be monitored according to inlet pressure 13, when pressure decreases, inject high pressure by high-pressure helium entrance 16 Helium steady pressure.According to 12 monitoring temperature of inlet temperature until the temperature of test object is down to liquid nitrogen temperature.Work as inlet temperature 12 when being higher than liquid nitrogen temperature, increases the aperture of liquid nitrogen valve 17, increases liquid nitrogen flow;When inlet temperature 12 is less than liquid nitrogen temperature, Reduce the aperture of liquid nitrogen valve 17, reduce liquid nitrogen flow.
(5) liquid helium is injected into pipeline by liquid helium entrance 20a, flow is adjusted through liquid helium valve 19, by liquid helium heat exchanger liquid Helium entrance 9a enters liquid helium heat exchanger 9.In liquid helium heat exchanger 9, the heat of liquid helium absorption cycle helium, heating gasification, cycle Helium brings the cold of liquid helium to test object.
According to 12 monitoring and test object temperature of inlet temperature until temperature is down to desired value.When inlet temperature 12 is higher than target During temperature, the aperture of liquid helium valve 19 is increased, increases liquid helium flow;When inlet temperature 12 is less than target temperature, reduce liquid helium valve 19 aperture reduces liquid helium flow.
According to the entrance temperature difference requirement of test object, the temperature difference is tested by inlet temperature 12 and outlet temperature 14.Work as survey When trying the temperature difference more than target temperature difference, reduce the aperture of by-passing valve 4, increase main road flow (can be monitored by main road flowmeter 5a), Until the test temperature difference reaches target temperature difference.When testing the temperature difference less than target temperature difference, increase the aperture of by-passing valve 4, reduce main road Flow (can be monitored) by main road flowmeter 5a, increase bypass flow (can be monitored by bypass flow meter 5b), until test temperature Difference reaches target temperature difference.According to test requirements document, the requirement of temperature, pressure, the temperature difference is maintained, completes test period, until experiment knot Beam.
(6) after the test, 15 exhaust decompression of air bleeding valve is opened, test object is risen again naturally, is closed liquid helium valve 19 and is stopped Liquid helium is supplied.It is monitored by inlet temperature 12, until test object rises to natural temperature.
The embodiment of the present invention is explained in detail above, the above embodiment is only most highly preferred embodiment of the invention, It, within the knowledge of a person skilled in the art, can also be but the present invention is not limited to above-described embodiment It is made a variety of changes under the premise of not departing from present inventive concept.

Claims (2)

1. a kind of refrigeration and pressure charging system for pipeline structure environmental simulation, which is characterized in that including:High-pressure helium entrance (16), level-one Recuperative heat exchanger (7), two level Recuperative heat exchanger (10), liquid nitrogen heat exchanger (8), liquid helium heat exchanger (9);Wherein, it is high Helium entrance (16) is pressed to input normal temperature high voltage helium, is returned successively by level-one Recuperative heat exchanger (7), liquid nitrogen heat exchanger (8), two level It is exported after heat exchanger (10), liquid helium heat exchanger (9) to test object;Test object return-air exchanges heat successively by two level backheat It is recycled again after device (10), level-one Recuperative heat exchanger (7);Liquid nitrogen recycles after liquid nitrogen heat exchanger (8), and liquid helium is successively It is recycled after liquid helium heat exchanger (9), two level Recuperative heat exchanger (10), level-one Recuperative heat exchanger (7);
Wherein, normal temperature circulation helium is tentatively pre-chilled using the cold of liquid helium and test object return-air for level-one Recuperative heat exchanger (7), Two level Recuperative heat exchanger (10) utilizes liquid helium outlet and the further cooling cycle helium of test object return-air cold;Liquid nitrogen heat exchanger (8) for recycling the heat exchange of helium and liquid nitrogen, liquid helium heat exchanger (9) is for recycling the heat exchange of helium and liquid helium.
2. a kind of refrigeration and pressure charging system for pipeline structure environmental simulation as described in claim 1, which is characterized in that also Including:Circulated helium pumps (1);Surge tank shut-off valve (2);Surge tank (3);By-passing valve (4);Room temperature intake valve (4a);Room temperature returns Air valve (4b);Main road flowmeter (5a);Bypass flow meter (5b);Helium air bleeding valve (6);
Low temperature air inlet valve (11a);Low temperature return-air valve (11b);Inlet temperature (12);Inlet pressure (13);Outlet temperature (14);Row Air valve (15);High-pressure helium entrance (16);High pressure helium air valve (16a);Liquid nitrogen valve (17);Liquid nitrogen entrance (18a);Liquid nitrogen exports (18b);Liquid helium valve (19);Liquid helium entrance (20a);Liquid helium exports (20b);Helium recovery unit (21);
Also, level-one Recuperative heat exchanger (7) includes:Level-one Recuperative heat exchanger liquid helium entrance (7a);Level-one Recuperative heat exchanger liquid helium It exports (7b);Level-one Recuperative heat exchanger room temperature helium entrance (7c);Level-one Recuperative heat exchanger room temperature helium exports (7d);Level-one is returned Heat exchanger cycle helium return air inlet (7e);Level-one Recuperative heat exchanger cycle helium return air outlet (7f);
Liquid nitrogen heat exchanger (8) includes:Liquid nitrogen heat exchanger helium entrance (8a);Liquid nitrogen heat exchanger helium exports (8b);Liquid nitrogen exchanges heat Device liquid nitrogen entrance (8c);Liquid nitrogen heat exchanger liquid nitrogen exports (8d);
Liquid helium heat exchanger (9) includes:Liquid helium heat exchanger liquid helium entrance (9a);Liquid helium heat exchanger liquid helium exports (9b);Liquid helium exchanges heat Device helium entrance (9c);Liquid helium heat exchanger helium exports (9d);
Two level Recuperative heat exchanger (10) includes:Two level Recuperative heat exchanger liquid helium entrance (10a);Two level Recuperative heat exchanger liquid helium exports (10b);Two level Recuperative heat exchanger helium entrance (10c);Two level Recuperative heat exchanger helium exports (10d);Two level Recuperative heat exchanger Recycle helium return air inlet (10e);Two level Recuperative heat exchanger cycle helium return air outlet (10f);
Wherein, circulated helium pump (1) is power source;Recycle helium through liquid nitrogen heat exchanger (8) and liquid helium heat exchanger (9) by liquid nitrogen and The cold that liquid helium generates is brought to test object;Circulated helium pumps (1) for helium to be driven to be recycled in pipeline and test object, and Exchange the cold cooling test object of liquid nitrogen and liquid helium;
Surge tank (3) stablizes the flow of circulated helium pump (1) generation and the pulsation of pressure;The upper end of surge tank (3) is provided with height Helium valve (16a) and high-pressure helium entrance (16) are pressed, for the input of high-pressure helium;The lower end of surge tank (3) is provided with buffering Tank shut-off valve (2);
The level-one Recuperative heat exchanger (7), liquid nitrogen heat exchanger (8), liquid helium heat exchanger (9), two level Recuperative heat exchanger (10) collection Into in Dewar;
Circulated helium pump (1) outlet is connected with surge tank shut-off valve (2), room temperature intake valve (4a), bypass flow meter (5b), is buffered The other end of tank shut-off valve (2) is connected with surge tank (3), and high pressure helium air valve (16a) is connected to surge tank (3) and high-pressure helium enters Mouth (16);
Room temperature intake valve (4a) is connected to circulated helium pump (1) and main road flowmeter (5a), the other end of main road flowmeter (5a) It is connected with the level-one Recuperative heat exchanger room temperature helium entrance (7c) on the level-one Recuperative heat exchanger (7) in Dewar, level-one backheat is changed Hot device room temperature helium outlet (7d) connects with liquid nitrogen heat exchanger helium entrance (8a), liquid nitrogen heat exchanger helium outlet (8b) and two level Recuperative heat exchanger helium entrance (10c) is connected, two level Recuperative heat exchanger helium outlet (10d) and liquid helium heat exchanger helium entrance (9c) is connected;Low temperature air inlet valve (11a) both ends be connected to respectively liquid helium heat exchanger helium outlet (9d) and inlet temperature (12) and Inlet pressure (13) test point;Low temperature return-air valve (11b) is connected to test object exhaust outlet and recycles helium with two level Recuperative heat exchanger Gas return air inlet (10e);Two level Recuperative heat exchanger cycle helium return air outlet (10f) is returned with level-one Recuperative heat exchanger cycle helium Gas entrance (7e) is connected, level-one Recuperative heat exchanger cycle helium return air outlet (7f) and room temperature return-air valve (4b) and air bleeding valve (15) It is connected;The gas returning port of cycle helium pump (1) is connected with by-passing valve (4) and by-passing valve (4);By-passing valve (4) other end is connected to side Through-flow gauge (5b);
For liquid helium circuit, liquid helium valve (19) both ends connection liquid helium entrance (20a) and liquid helium heat exchanger liquid helium entrance (9a), liquid helium Heat exchanger liquid helium outlet (9b) connection two level Recuperative heat exchanger liquid helium entrance (10a), two level Recuperative heat exchanger liquid helium outlet (10b) It is connected with level-one Recuperative heat exchanger liquid helium entrance (7a), helium air bleeding valve (6) is connected to the outlet of level-one Recuperative heat exchanger liquid helium (7b) and liquid helium export (20b), and liquid helium outlet (20b) is arranged on helium recovery unit (21);
Cycle helium in system is provided with two branches, is monitored respectively using main road flowmeter (5a) and bypass flow meter (5b) Helium gas flow;Helium is used to carry the cold cooling test object of liquid nitrogen and liquid helium in main road, and main road total flow can pass through tune By-passing valve (4) is saved to adjust;
The circulated helium of main road is expressed as follows:The high-pressure helium that (1) generation is pumped by circulated helium is adjusted through room temperature intake valve (4a) Pressure, and flow is shown by main road flowmeter (5a), from level-one Recuperative heat exchanger room temperature helium entrance (7c) into level-one backheat Heat exchanger (7) enters after level-one Recuperative heat exchanger room temperature helium outlet (7d) discharge through liquid nitrogen heat exchanger helium entrance (8a) Liquid nitrogen heat exchanger (8) fully exchanges heat with liquid nitrogen;Helium is recycled after liquid nitrogen heat exchanger helium outlet (8b) discharge through two level backheat Heat exchanger helium entrance (10c) is discharged into two level Recuperative heat exchanger (10), and by two level Recuperative heat exchanger helium outlet (10d) Through liquid helium heat exchanger helium entrance (9c) into liquid helium heat exchanger (9);From the cycle of liquid helium heat exchanger helium outlet (9d) discharge Helium enters test object, and monitor inlet temperature (12) and inlet pressure (13) after low temperature air inlet valve (11a) adjustment;Test The cycle helium of object discharge recycles helium return air inlet after low temperature return-air valve (11b) adjustment through two level Recuperative heat exchanger (10e) is discharged into two level Recuperative heat exchanger (10) and by two level Recuperative heat exchanger cycle helium return air outlet (10f);Hereafter, It recycles helium and recycles helium return air inlet (7e) into level-one Recuperative heat exchanger (7) and initial cycle through level-one Recuperative heat exchanger Helium exchanges heat;Helium is back to after discharging from level-one Recuperative heat exchanger cycle helium return air outlet (7f) through room temperature return-air valve (4b) to follow Ring pump (1) completes cycle;
The circulated helium of bypass is expressed as follows:The high-pressure helium part that (1) generation is pumped by circulated helium is adjusted through by-passing valve (4) It is directly back to circulated helium pump (1) afterwards, this road flow is monitored by bypass flow meter (5b).
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