CN103969288B - A kind of low-temperature space test device of thermal conductivity coefficient - Google Patents
A kind of low-temperature space test device of thermal conductivity coefficient Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 82
- 239000007788 liquid Substances 0.000 claims abstract description 60
- 238000009413 insulation Methods 0.000 claims abstract description 44
- 238000005485 electric heating Methods 0.000 claims abstract description 14
- 238000009835 boiling Methods 0.000 claims abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 239000010935 stainless steel Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 44
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 38
- 229910052757 nitrogen Inorganic materials 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 17
- 230000001681 protective effect Effects 0.000 claims description 11
- 230000033228 biological regulation Effects 0.000 claims description 9
- 229910052743 krypton Inorganic materials 0.000 claims description 6
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
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- 238000000034 method Methods 0.000 description 12
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- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
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- 239000012774 insulation material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- WWYNJERNGUHSAO-XUDSTZEESA-N (+)-Norgestrel Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](CC)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 WWYNJERNGUHSAO-XUDSTZEESA-N 0.000 description 1
- 239000010963 304 stainless steel Substances 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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Abstract
The invention provides a kind of low-temperature space test device of thermal conductivity coefficient, comprise low-temperature heat-insulation pressure container and gas concentration unit, electric heating supercharging device and bracing frame is provided with bottom low-temperature heat-insulation pressure container, bracing frame is provided with test suite container, low-temperature heat-insulation pressure container top is provided with thermally insulated container lid, and thermally insulated container covers and is provided with air intake opening, relief valve connection, central tap interface, sensor interface and exhausr port successively; Test gas cylinder is connected with air intake opening by feed liquor motorized valve, and relief valve connection is connected with safety valve, and test suite lead-in wire is connected with central tap interface by stainless steel flexible hose; Also be provided with the liquid level sensor and temperature sensor that are connected with computing machine by going between in low-temperature heat-insulation pressure container, gas concentration unit is positioned at the endpiece of exhausr port; The present invention adopts the combination of multiple liquid gas medium, the principle corresponding with environmental pressure according to boiling point of liquid, overcomes single liquid gas by the not high problem of the accuracy of flow control temperature.
Description
Technical field
The present invention relates to low temperature environment field tests, particularly a kind of low-temperature space test device of thermal conductivity coefficient.
Background technology
Coefficient of heat conductivity is one of elementary heat physical parameter of material.At present, along with the fast development of cryogenic technique, the cryogenic liquids such as liquid nitrogen, liquid oxygen and LNG are more and more extensive in the application of each field such as domestic life, industry, medical treatment, Aero-Space, transport and preserve these cryogenic liquids and need the solid insulating material that coefficient of heat conductivity is extremely low, and the data of thermal insulation material coefficient of heat conductivity in low-temperature space quite lack, make troubles to research work.
The measuring method of coefficient of heat conductivity has steady state method and cold store enclosure two kinds, and when measuring Measurement of Low Temperature Thermal Conductivity, any one method all needs stable low temperature environment.At present, each research institute, unit of company adopt this Single Medium of liquid nitrogen as Environmental cold source mostly, realize low temperature environment by controlling liquid nitrogen input quantity.After required environment temperature is higher than liquid nitrogen boiling point, temperature reality is controlled by low temperature nitrogen, but the thermo parameters method that this method realizes is uneven, and temperature accuracy is not high.
Summary of the invention
For solving the not high problem of single low-temperature receiver control temperature degree of accuracy, the invention provides a kind of low-temperature space test device of thermal conductivity coefficient realizing temperature and accurately control, this device adopts the pressure controlled method of multiple cold-producing medium, only need calculate the force value that environment temperature required (boiling temperature of refrigerant liquid) is corresponding, by controlling electric heating supercharging device and pressure regulation motorized valve, namely realize the object of precise control of temperature, the present invention is achieved through the following technical solutions:
A kind of low-temperature space test device of thermal conductivity coefficient, is characterized in that, be provided with electric heating supercharging device and bracing frame bottom low-temperature heat-insulation pressure container, bracing frame is provided with test suite container; Low-temperature heat-insulation pressure container top is provided with thermally insulated container lid, and thermally insulated container covers and is provided with air intake opening, relief valve connection, central tap interface, sensor interface and exhausr port successively; Test gas cylinder is connected with air intake opening by feed liquor motorized valve, and safety valve is connected with internal tank by relief valve connection, and test suite lead-in wire is connected with central tap interface by stainless steel flexible hose; Also be provided with liquid level sensor and temperature sensor in low-temperature heat-insulation pressure container, their lead-in wire is connected with computing machine through signal conversion and control module respectively by sensor interface, and the endpiece of exhausr port is connected with gas concentration unit.
Preferably; in the present invention; electric heating supercharging device comprises circular electrical-heating film, protective housing and electric wire; wherein; circular electrical-heating film is close to protective housing upper surface; protective housing is welded on low-temperature heat-insulation pressure container bottom centre and is provided with electric wire opening, and electric wire is crossed electric wire opening and is connected with programmable power supply with sensor interface, and controls the break-make of power supply by computing machine.
Preferably, in the present invention, be also provided with heat exchanger between the pipeline of test gas cylinder and feed liquor motorized valve, heat exchanger is connected with liquid nitrogen bottle by motorized valve.
Preferably, in the present invention, described test gas cylinder is built with liquid nitrogen; One in Krypton, cold-producing medium R23 or cold-producing medium R125.
Preferably, in the present invention, described gas concentration unit of stating comprises buffer container and collection container, buffer container top is provided with the first air intake opening and first row gas port, first row gas port endpiece is provided with the second hand valve and the 3rd pressure transducer successively, collection container top is provided with the second air intake opening, and the second inlet port end is connected with the second pressure transducer and the 3rd hand valve successively, and the 3rd hand valve inlet end is provided with four-way; Endpiece, the second manual valve outlet port end of exhausr port are equipped with threeway, the endpiece of exhausr port by threeway through pipeline, one tunnel first hand valve docks with four-way, and a road is docked with the first air intake opening through the first pressure transducer, pressure regulation motorized valve, the first retaining valve successively; Second manual valve outlet port end is by threeway through pipeline, and a road is docked with four-way through compressor, and a road is docked with four-way through the second retaining valve, vacuum pump successively.
In the present invention, described low-temperature heat-insulation pressure container manufactures according to heavy caliber liquid nitrogen container GB/T14174-2012 standard.
The present invention utilizes the boiling point of liquid to change according to the change of residing environmental pressure, when pressure increase suffered by liquid, and the elevation of boiling point; When pressure reduces, boiling point reduces.By changing the pressure environment in container, obtaining corresponding liquid boiling temperature, adding heat and external environment condition by the inside of test suite and adding heat heating and make it to be stabilized in boiling point.Heating power, external environment add heat and test suite to low-temperature heat-insulation pressure container (comprising connecting line) add heat sum and are more than or equal to liquid in low-temperature heat-insulation pressure container and remain on heat needed for boiling temperature.
Compared with prior art, the invention has the advantages that:
(1) regulate pressure in low temperature insulation container by control electric heating supercharging device and pressure regulation motorized valve, make liquid gas be in boiling temperature all the time, improve control accuracy;
(2) be in the liquid of boiling temperature, the temperature homogeneity of its inside will be better than gas greatly, improves the stability of environment temperature;
(3) the present invention is applicable to the low-temperature stabilization environment realizing steady state method and Transient Method heat conducting coefficient measuring simultaneously, has general applicability;
(4) the present invention can be according to actual needs, any selection liquid gas working medium, as realized-195.8 ~-153 DEG C of warm areas with liquid nitrogen, liquid krypton realizes-153 ~-82 DEG C of warm areas, cold-producing medium R23 realizes-82 ~-48 DEG C of warm areas, cold-producing medium R125 realizes-48 ~ 25 DEG C of warm areas, can by the multiple liquid gas working medium of collocation to obtain the warm area under low temperature widely;
(5) low temperature insulation container manufactures according to GB/T14174-2012 standard, and insulation effect is good, is conducive to the stable of temperature environment.
Accompanying drawing explanation
Fig. 1 is Liquid level principle schematic.
Fig. 2 is Stress control principle schematic.
Fig. 3 is compressor control principle schematic.
Fig. 4 is the test device of thermal conductivity coefficient control principle schematic diagram of low-temperature space.
Fig. 5 is the test device of thermal conductivity coefficient structural representation of low-temperature space.
Wherein, 1-1 test gas cylinder, 1-2 liquid nitrogen bottle, 1-3 motorized valve, 1-4 heat exchanger, 1-5 feed liquor motorized valve, 1-6 inlet, 1-7 safety valve, 1-8 relief valve connection, 1-9 test suite goes between, 1-10 central tap interface, 1-11 sensor interface, 1-12 exhausr port, 1-13 first pressure transducer, 1-14 pressure regulation motorized valve, 1-15 liquid level sensor, 1-16 bracing frame, 1-17 temperature sensor, 1-18 electric heating supercharging device, 1-19 test suite container, 1-20 low-temperature heat-insulation pressure container; 1-21 stainless steel flexible hose, 1-22 thermally insulated container lid;
2-1 buffer container, 2-2 first retaining valve, 2-3 first hand valve, 2-4 compressor, 2-5 second hand valve, 2-6 second retaining valve, 2-7 vacuum pump, 2-8 the 3rd hand valve, 2-9 second pressure transducer, 2-10 collection container, 2-11 second air intake opening, 2-12 first row gas port, 2-13 first air intake opening, 2-14 the 3rd pressure transducer.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described, and embodiment is implemented premised on technical solution of the present invention, gives detailed embodiment and concrete operating process but protection scope of the present invention is not limited to following embodiment.
Embodiment 1 carries out low-temperature space Determination of conductive coefficients for stable state Guarded hot plate to test thermal insulation material
As shown in Figure 5, low-temperature space test device of thermal conductivity coefficient comprises low-temperature heat-insulation pressure container 1-20 and gas concentration unit, be provided with electric heating supercharging device 1-18 and bracing frame 1-16 bottom low-temperature heat-insulation pressure container 1-20, test suite container 1-19 is positioned on bracing frame 1-16; Low-temperature heat-insulation pressure container 1-20 top is provided with thermally insulated container lid 1-22, and thermally insulated container lid 1-22 is provided with inlet 1-6, relief valve connection 1-8, central tap interface 1-10, sensor interface 1-11 and exhausr port 1-12; Test gas cylinder 1-1 is connected with inlet 1-6 by feed liquor motorized valve 1-5, heat exchanger 1-4 is also provided with between test gas cylinder 1-1 and feed liquor motorized valve 1-5 pipeline, heat exchanger 1-4 is connected with liquid nitrogen bottle 1-2 by motorized valve 1-3, safety valve 1-7 is connected with low-temperature heat-insulation pressure container 1-20 inside by relief valve connection 1-8, and test suite lead-in wire 1-9 draws low-temperature heat-insulation pressure container 1-20 by stainless steel flexible hose 1-21, central tap interface 1-10; Liquid level sensor 1-15 and temperature sensor 1-17 is also provided with in low-temperature heat-insulation pressure container 1-20, their lead-in wire causes low-temperature heat-insulation pressure container 1-20 by sensor interface 1-11 and is connected with computing machine through signal conversion and control module respectively more outward, and described signal conversion and control module comprises programmable logic controller (PLC) (PLC), D/A module and A/D module; The endpiece of exhausr port 1-12 is connected with gas concentration unit;
In the present embodiment, gas concentration unit comprises buffer container 2-1 and collection container 2-10, buffer container 2-1 top is provided with the first air intake opening 2-13 and first row gas port 2-12, first row gas port 2-12 endpiece is provided with the second hand valve 2-5 and the 3rd pressure transducer 2-14, collection container 2-10 top is provided with the second air intake opening 2-13, second air intake opening 2-13 inlet end is connected with the second pressure transducer 2-9 and the 3rd hand valve 2-8 successively, and the 3rd hand valve 2-8 inlet end is provided with four-way; Endpiece, the second hand valve 2-5 endpiece of exhausr port 1-12 are equipped with threeway, the endpiece of exhausr port 1-12 by threeway through pipeline, one tunnel first hand valve 2-3 docks with four-way, and a road is docked with the first air intake opening 2-13 through the first pressure transducer 1-13, pressure regulation motorized valve 1-14, the first retaining valve 2-2 successively; Second hand valve 2-5 endpiece is by threeway through pipeline, and a road is docked with four-way through compressor 2-4, and a road is docked with four-way through the second retaining valve 2-6, vacuum pump 2-7 successively.
In the present embodiment, electrical heating supercharging device 1-18 comprises: circular electrical-heating film, protective housing, electric wire, and wherein: circular electrical-heating film is close to protective housing upper surface, its heating power is 20W; Protective housing is welded on low-temperature heat-insulation pressure container bottom centre and is provided with electric wire opening, and electric wire is crossed electric wire opening and is connected with programmable power supply by sensor interface, and controls the break-make of power supply by computing machine.
In the present embodiment, low-temperature heat-insulation pressure container 1-20 manufactures according to heavy caliber liquid nitrogen container GB/T14174-2012 standard, and ensure good heat-insulating property, its design pressure is 3.5Mpa, and pressure opened by safety valve is 3Mpa, ensures safety,
In the present embodiment, test gas cylinder 1-1 is for providing the cryogenic liquid needed for test environment, in-built high pressure Krypton, after being converted into liquid gas by heat exchanger 1-4, enter in low-temperature heat-insulation pressure container 1-20 by feed liquor motorized valve 1-4 again, heat exchanger 1-4 provides liquid nitrogen as required cooling medium by liquid nitrogen bottle 1-2.
In the present embodiment, test suite container 1-19, buffer container 2-1 and collection container 2-10 make by austenite 304 stainless steel, the inner installation testing assembly of test suite container 1-19, buffer container 2-1 exit second hand valve 2-5 opens when working always, close after end-of-job, disassemble from here when regaining gas; Collection container 2-10 design pressure 20Mpa, the second pressure transducer 2-9, for experiencing the pressure of collection container 2-10, are sent to computing machine through signal conversion and control module, are convenient to monitoring, prevent superpressure.3rd hand valve 2-8 operationally opens, and closes during end-of-job, and from then on position dismounting collection container 2-10.
In the present embodiment, protective heat plate test suite structure requires assembling according to GB/T10294-2008/ISO8302:1991 " mensuration-Guarded hot plate of Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics ", cold drawing is close to test suite container 1-19 top and bottom, to ensure good heat-transfer effect.
The course of work of the present embodiment:
Inspection information is combined into the liquid gas scheme realized needed for temperature range, determine the temperature spot needing to control, and calculate the pressure corresponding with temperature, interface parameters is set by the PID in KingView program, provide set-point, separately design job control interface, data acquisition storehouse etc., again all kinds of lead-in wire is connected with signal conversion module, and post debugging KingView program work is normal.
The present embodiment realizes the warm area of-145 ~-105 DEG C with high pressure Krypton, is a reference mark with every 10 DEG C, calculates corresponding force value as shown in the table, is worked out by following temperature as Non-follow control point in KingView program.
Protective heat plate test suite is installed in built-in test assembly container 1-19 by GB/T10294-2008/ISO8302:1991 standard group, cold drawing is close to test suite container top and bottom, to ensure good heat-transfer effect, test suite lead-in wire 1-9, namely heater wire and temperature sensor wires through stainless steel flexible hose 1-21, central tap interface 1-10 respectively with test power and signal conversion and control model calling to heat and image data.
Open the first hand valve 2-3, second hand valve 2-5 and the 3rd hand valve 2-8, open vacuum pump 2-7 by low-temperature heat-insulation pressure container 1-20, vacuum pump 2-7 is closed after buffer container 2-1 and collection container 2-10 is evacuated to 10-3Pa, close the first hand valve 2-3 simultaneously, control feed liquor motorized valve 1-5 and motorized valve 1-3 by the liquid level information in KingView program by signal conversion and control module to open simultaneously, liquid gas is filled with in low-temperature heat-insulation pressure container, first temperature value-145 DEG C preset is selected in KingView program, liquid krypton is seethed with excitement in electric heating supercharging device 1-18 heating and the information gathered by the first pressure transducer 1-13 sends instruction to signal conversion and control module as calculated after machine contrast controls pressure regulation motorized valve 1-14 and make pressure stability at the 0.186MPa of correspondence, again according to temperature sensor 1-17, the information that first pressure transducer 1-13 and liquid level sensor 1-15 gather carries out PID control through signal conversion and control module transfer to the liquid level information of computing machine and KingView program initial setting and force value, send instruction by KingView program to work opportunity through programmable power supply control electrical heating supercharging device 1-18, after signal conversion module sends signal, control pressure regulation motorized valve 1-14 simultaneously, feed liquor motorized valve 1-5 and motorized valve 1-3 opens opportunity, temperature environment is stablized, after fluid temperature in low-temperature heat-insulation pressure container 1-20 is stable, until after the temperature value that the temperature sensor in test suite gathers is stable, implement according to double-test-piece stable state Guarded hot plate test philosophy, and gather first group of experimental data by the database in KingView program, after end, in KingView program, manual switchover to the second temperature spot-135 DEG C, carries out successively.After the warm area realized when a kind of working medium completes, open the first hand valve 2-3 and the 3rd hand valve 2-8, collection container 2-10 can collect the gas through exhausr port 1-12, the first hand valve 2-3 and the 3rd hand valve 2-8 discharge in low temperature insulation container 1-20, after liquid gas in low temperature insulation container 1-20 drains, clean, change other cryogenic liquid test gas cylinders of splendid attire.
Feed liquor motorized valve 1-5 is arranged in liquid gas inlet ductwork, motorized valve 1-3 is arranged between liquid nitrogen bottle 1-2 and heat exchanger 1-4, its principle of work as shown in Figure 1, in computing machine KingView program, write Liquid level standard in advance: open feed liquor motorized valve 1-5 feed liquor when liquid level is reduced to 85% of low-temperature heat-insulation pressure container 1-20 internal height, close when liquid level is increased to 90% of low-temperature heat-insulation pressure container 1-20 internal height; Liquid level information transmission extremely input A/D module (modular converter EM231) in low-temperature heat-insulation pressure container 1-20 is gathered again by liquid level sensor 1-15, be connected to KingView program by programmable logic controller (PLC) PLC (CPU224) again, after contrast, send instruction by program again controlling its opening and closing simultaneously through exporting D/A module (modular converter EM232) to feed liquor motorized valve 1-5 and motorized valve 1-3.
As shown in Figure 2, electric heating increases device 1-18 and heats the pressure information gathered by the first pressure transducer 1-13 opportunity and transfer to force value that signal conversion and control module presets to computing machine and KingView program again and contrast and determine afterwards, when low-temperature heat-insulation pressure container 1-20 force value is less than temperature spot corresponding pressure, computing machine sends instruction and heats supercharging through programmable power supply to electric heating supercharging device 1-18, when low-temperature heat-insulation pressure container 1-20 force value reaches temperature spot corresponding pressure, programmable power supply power-off; When testing a temperature spot and needing to heat up (i.e. supercharging), program can connect programmable power supply automatically makes electric heating supercharging device 1-18 be that liquid gas heating makes it evaporate, to reach to the object of vessel pressurization, and heating makes the temperature of liquid refrigerant keep stable as required.
Compressor 2-4 is used for the gas in buffer container 2-1 to be evacuated to collection container 2-10, its principle of work as shown in Figure 3, preset in KingView program: when in buffer container 2-1, pressure equals pressure in low-temperature heat-insulation pressure container 1-20, compressor 2-4 is energized work; By the 3rd pressure transducer 2-14 gather information through A/D model calling to computing machine, after in KingView program, preset value contrasts, computing machine sends instruction through D/A module to compressor, realize controlling, second retaining valve 2-6, when compressor operating, prevents from the gas of extraction to be back to compressor 2-4 porch through the pipeline of vacuum pump 2-7.
Fig. 4 is the present embodiment device principle of work schematic diagram.
The present embodiment is according to GB/T10294-2008/ISO8302:1991 " mensuration-Guarded hot plate of Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics " described measuring method, its principle is based on one-dimensional steady-state heat transfer, when test material two sides is in different temperature, measure the heat flux flowing through effective heat transfer area of test material, the temperature difference and thickness between test material two surface, calculate its coefficient of heat conductivity.
Wherein heat flux is the heating power by calculating the well heater between embedding two pieces metering heating plate, to determine the heat flux by test material; Measure respectively with the temperature of cold drawing contact side test material and with the temperature of metering heater contacts side test material to obtain the temperature difference of test material upper and lower surface; Test material thickness passes through kind of calliper; Useful area is obtained by measuring heater diameter.
Test container is special according to the size of test suite, the internal height of test container equals the height of test suite, when guaranteeing to assemble, the container cover of test container can engaged test assembly top completely, and compress test suite, to make to obtain good heat-transfer effect between each assembly by the pretightning force of bolt during installation testing container cover.The heat that metering heating plate produces axially by test material, and is delivered to two cold drawings in outside.
The coefficient of heat conductivity of test material calculates according to the Fourier law of one-dimensional steady-state heat transfer:
Wherein: Q-passes to the heat (unit: W) of test material; The coefficient of heat conductivity (unit: W/mK) of λ-test material; A-test material useful area (unit: m
2); The Δ T-test material upper and lower surface temperature difference (unit: K); D-test material average thickness (unit: m).
The present embodiment is two test material protection hot plate apparatus, draws:
Upper and lower test material is identical, and namely thickness is equal, then heat conduction is expressed as:
Embody rule approach of the present invention is a lot; the above is only one embodiment of the present invention; in specific operation process, liquid nitrogen, cold-producing medium R23 or cold-producing medium R125 can be housed in test gas cylinder; specifically should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvement, these improvement also should be considered as protection scope of the present invention.
Claims (5)
1. a low-temperature space test device of thermal conductivity coefficient, comprises low-temperature heat-insulation pressure container and gas concentration unit, it is characterized in that, is provided with electric heating supercharging device and bracing frame bottom low-temperature heat-insulation pressure container, and bracing frame is provided with test suite container; Low-temperature heat-insulation pressure container top is provided with thermally insulated container lid, and thermally insulated container covers and is provided with the 3rd air intake opening, relief valve connection, central tap interface, sensor interface and second exhaust port successively; Test gas cylinder is connected with the 3rd air intake opening by feed liquor motorized valve, and relief valve connection is connected with safety valve, and test suite lead-in wire is connected with central tap interface by stainless steel flexible hose; Also be provided with the liquid level sensor and temperature sensor that are connected with computing machine by going between in low-temperature heat-insulation pressure container, gas concentration unit is positioned at the endpiece of second exhaust port;
Described gas concentration unit comprises buffer container and collection container, buffer container top is provided with the first air intake opening and first row gas port, first row gas port endpiece is provided with the second hand valve and the 3rd pressure transducer successively, collection container top is provided with the second air intake opening, second inlet port end is connected with the second pressure transducer and the 3rd hand valve successively, and the 3rd hand valve inlet end is provided with four-way; Endpiece, the second manual valve outlet port end of second exhaust port are equipped with threeway, the endpiece of second exhaust port by threeway through pipeline, one tunnel first hand valve docks with four-way, and a road is docked with the first air intake opening through the first pressure transducer, pressure regulation motorized valve, the first retaining valve successively; Second manual valve outlet port end is by threeway through pipeline, and a road is docked with four-way through compressor, and a road is docked with four-way through the second retaining valve, vacuum pump successively;
Test gas cylinder is for providing the cryogenic liquid needed for test environment, after being converted into liquid gas by heat exchanger, enter in low-temperature heat-insulation pressure container by feed liquor motorized valve again, by controlling pressure in electric heating supercharging device and pressure regulation motorized valve adjustment low temperature insulation container, liquid gas is made to be in boiling temperature all the time.
2. low-temperature space test device of thermal conductivity coefficient according to claim 1; it is characterized in that; described electric heating supercharging device comprises circular electrical-heating film, protective housing and electric wire; wherein; circular electrical-heating film is close to protective housing upper surface; protective housing is welded on low-temperature heat-insulation pressure container bottom centre and is provided with electric wire opening, and electric wire is crossed electric wire opening and is connected with programmable power supply.
3. low-temperature space test device of thermal conductivity coefficient according to claim 2, it is characterized in that, described heat exchanger is arranged between described test gas cylinder and feed liquor motorized valve pipeline, and heat exchanger is connected with liquid nitrogen bottle by motorized valve.
4. low-temperature space test device of thermal conductivity coefficient according to claim 3, it is characterized in that, described test gas cylinder is built with the one in liquid nitrogen, Krypton, R23 or R125.
5. according to one of claim 1-4 described low-temperature space test device of thermal conductivity coefficient, it is characterized in that, described low-temperature heat-insulation pressure container manufactures according to heavy caliber liquid nitrogen container GB/T14174-2012 standard.
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| US6824306B1 (en) * | 2002-12-11 | 2004-11-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Thermal insulation testing method and apparatus |
| CN1867799A (en) * | 2003-10-17 | 2006-11-22 | 梅塞尔集团有限公司 | Method for filling a pressure vessel with gas |
| CN102324205B (en) * | 2011-08-30 | 2013-07-31 | 华北电力大学 | Experimentally runnable pressurized water reactor and steam generator simulation model thereof |
| CN102788815A (en) * | 2012-08-24 | 2012-11-21 | 中煤科工集团重庆研究院 | Exploding tank used for ultralow temperature gas explosion characteristic test |
| CN103115941A (en) * | 2013-01-25 | 2013-05-22 | 上海交通大学 | Novel closed heat conductivity coefficient testing device |
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2014
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Inventor after: Zhu Chunling Inventor after: Cai Yufei Inventor after: Zhang Tao Inventor after: Zhang Tao Inventor after: Liu Zhijian Inventor after: Xu Annan Inventor before: Zhu Chunling Inventor before: Cai Yufei Inventor before: Zhang Tao Inventor before: Zhang Tao |
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