CN108479865A - It is a kind of can simulated high altitude climatic environment experimental rig - Google Patents
It is a kind of can simulated high altitude climatic environment experimental rig Download PDFInfo
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- CN108479865A CN108479865A CN201810149789.5A CN201810149789A CN108479865A CN 108479865 A CN108479865 A CN 108479865A CN 201810149789 A CN201810149789 A CN 201810149789A CN 108479865 A CN108479865 A CN 108479865A
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- supply line
- chamber
- valve
- heat sink
- high altitude
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
- B01L1/02—Air-pressure chambers; Air-locks therefor
- B01L1/025—Environmental chambers
Abstract
The present invention it is a kind of can simulated high altitude climatic environment experimental rig, including chamber, refrigeration system, vacuum system and control system, refrigeration system is core, and refrigeration system, which passes through, adjusts gas GN in pipeline2With LN2Flow to reach target temperature after so that it is mixed with certain proportion, then by blending agent be sent into it is heat sink in, the heat sink environment temperature by outside radiation control chamber.The present invention can the device of simulated high altitude climatic environment take heat sink radiation heat transfer to add faint heat convection, solve traditional compressor air cooling refrigeration temperature drift problems under low pressure, the control accuracy of temperature greatly improves.
Description
Technical field
It is a kind of to introduce heat sink temperature adjustment and come simulated high altitude low pressure, low temperature gas the present invention relates to reliability environment test equipment
Wait the experimental rig of environment.
Background technology
Plateau climate environment is special, and with air pressure, low, rarefaction of air, solar irradiation are strongly, earth's surface temperature is low, is air-dried
The characteristics of.These complex environment factors have the influence that can not be despised for the product to work herein, therefore product is put into
It can not ignore using a series of preceding reliability environment tests of progress.
It is contemplated that low pressure within the scope of (troposphere：Mid latitudes are in earth surface 12Km), product spoke
It penetrates heat dissipation proportion to increase, heat loss through convection proportion reduces, empty around the product that radiates additionally due to the reduction of atmospheric density
Gas ingredient will also change, and steam is easier to be attached to product surface to frosting.Due to complex environment shape under low pressure
The mechanically and electrically performance of state, product can be all greatly affected, and sometimes result in the damage of product, therefore in product design rank
Section must just carry out the verification for receiving high/low temperature low pressure test (LPT), and product quality can just be guaranteed.
The test method and device of simulation high/low temperature and pressure at present, refrigeration are by compressor and heating with heating
Silk achieves the goal, and also needs to cooperation vacuum pump when being controlled into trip temperature in this way and carries out pressure adjusting, and in a low voltage state
If by air-cooled carry out temperature control, first, easily causing temperature drift, it is unfavorable for temperature stabilization；Second is that in air-cooled or it is more or
There can be steam less, result in occurring frost in chamber in this way.
Invention content
The present invention propose it is a kind of can simulated high altitude climatic environment experimental rig, pass through heat sink control under hypobaric
Temperature change substitutes traditional compressor air cooling refrigeration, and to solve under low pressure, frosting is asked in temperature drift problems and chamber
Topic.
Technical solution of the invention is：
Can simulated high altitude climatic environment device, including chamber 1, refrigeration system, vacuum system and control system are special
Different place is：
The refrigeration system includes heat sink 2, liquid nitrogen supply line 3, gaseous nitrogen supply line 4 and mixing supply line 5；
Described heat sink 2 are set in chamber 1, and described heat sink 2 include heat sink pipeline, the liquid nitrogen supply line 3, gas
It is both provided with valve, the liquid nitrogen supply line 3 and gaseous state in state nitrogen supply pipeline 4, mixing supply line 5 and vacuum system
The outlet of nitrogen supply pipeline 4 is connect with the entrance of mixing supply line 5, the outlet of the mixing supply line 5 and heat sink pipe
The medium inlet in road connects, and the media outlet of heat sink pipeline leads on the outside of chamber；
The control system includes PLC control unit, data collecting system, temperature sensor 8 and pressure sensor 9；Institute
State detection of the temperature sensor 8 for mixing blending agent temperature in supply line 5；The pressure sensor 9 is used for chamber 1
The detection of interior pressure；The input terminal of the PLC control unit passes through data collecting system and temperature sensor 8 and pressure sensor
9 connections, the output end of the PLC control unit and liquid nitrogen supply line 3, mix supply line 5 at gaseous nitrogen supply line 4
And the valve connection being arranged in vacuum system.
Further, it is the appearance for further preventing frost, further includes nitrogen exchange system, the nitrogen substitution line
System includes chamber air bleeding valve D4 and gas exhaust piping 10, rows of the chamber air bleeding valve D4 for gas in Control experiment case 1
Go out；Gas exhaust piping valve D3, entrance and the gaseous nitrogen supply pipe of the gas exhaust piping 10 are additionally provided on the gas exhaust piping 10
Road 4 connects, and the outlet of the gas exhaust piping 10 leads to inside chamber 1；The control system further includes humidity sensor 11, institute
Detection of the humidity sensor 11 for humidity in chamber 1 is stated, the output end of the humidity sensor 11 is acquired by data is
System is connect with the input terminal of PLC control unit, and the gas exhaust piping valve D3 and chamber air bleeding valve D4 are and PLC control unit
Output end connection.
Further, it is contemplated that flat to make the pressure in chamber reach dynamic the problem of testing equipment leakproofness itself
Weighing apparatus, the vacuum system includes the air extractor being connect with chamber 1, making-up air device, electric control valve D6 and electric control valve
D5；The air extractor is connect by electric control valve D5 with making-up air device, and the air extractor passes through electricity with making-up air device
Dynamic regulating valve D6 is connect with chamber 1, and electric control valve D5 is connect with the output end of electric control valve D6 and PLC control unit.
Further, the air extractor is screw pump 12, and the making-up air device is molecular pump 13.
Further, the temperature sensor 14 for detecting experiment the temperature inside the box is additionally provided on the heat sink pipeline.
Further, the stream for monitoring gaseous nitrogen and liquid nitrogen mixture is additionally provided on the mixing supply line 5
The mass flowmenter 15 of amount.
Further, it is additionally provided with the heater being connect with PLC control unit output end on the gaseous nitrogen supply line 4
16.There are two effects for heater, are adjusted first, liquid nitrogen is converted to gaseous nitrogen and participates in heat sink temperature.Second is that in experimental test
Gaseous nitrogen is sent into chamber with the state of room temperature to replace air in case when case gas displacement.
Compared with prior art, the present invention advantage is：
1, it is of the invention can simulated high altitude climatic environment experimental rig, it is faint that temperature control takes heat sink radiation heat transfer to add
Heat convection, solves traditional compressor air cooling refrigeration temperature drift problems under low pressure, and the control accuracy of temperature carries significantly
It is high.
2, it is of the invention can simulated high altitude climatic environment experimental rig, by nitrogen exchange system by the sky of complicated component
Gas is replaced into elementary gas nitrogen, has further prevented the appearance of frost.
Description of the drawings
Fig. 1 be the embodiment of the present invention can simulated high altitude climatic environment device composite structural diagram；
Fig. 2 be the embodiment of the present invention can simulated high altitude climatic environment device control structure figure.
Wherein reference numeral is：1- chambers, 2- is heat sink, 3- liquid nitrogen supply lines, 4- gaseous nitrogen supply lines, and 5- is mixed
Close supply line, 8- temperature sensors, 9- pressure sensors, 10- gas exhaust pipings, 11- humidity sensors, 12- screw pumps, 13-
Molecular pump, 14- thermocouple temperature sensors, 15- mass flowmenters, 16- heaters, 17- vaporizers, 18- corrugated flexible hoses.
Specific implementation mode
It elaborates to a preferred embodiment of the present invention below in conjunction with attached drawing 1-2.
As shown in Figure 1, the present invention can simulated high altitude climatic environment device mainly include chamber 1, refrigeration system, nitrogen
Exchange system, vacuum system and control system.
The present invention essentially consists in the comprehensive variation of simulation low pressure and temperature, and under hypobaric, gas molecule is thin,
Heat loss through convection institute accounting reduces, and convection type heat exchange has no longer been mainstream heat exchange mode, and heat convection easily causes temperature
Drift, therefore rely primarily on radiation heat transfer and carry out heat exchange.
Comprehensive all factors, refrigeration system of the invention no longer use traditional compressor air cooling refrigeration.Introduce heat sink 2 pairs of examinations
Temperature is controlled in tryoff 1, and heat sink 2 be a kind of device of simulated space cold black background, is built centainly by radiating
Environment temperature, mainly Control experiment the temperature inside the box, vacuum pipe by refrigerant temperature change in vacuum pipe in structure
Can according to experiment box shape design, then brush it is pitch-dark be fixed on chamber pressure-bearing inner wall, as shown in Figure 1, solid on experiment chamber door
It is connected by corrugated flexible hose 18 between fixed hot dirt pipeline and the fixed heat sink pipeline of experiment casing inner wall.
Arrange temperature sensor 14 for chamber inner ring border temperature in monitoring test on heat sink 2；Refrigerant liquid
N2It is divided into two-way, wherein first passing through vaporizer 17 all the way is changed into GN2, then the motorized adjustment that is connected with control system by one
Valve D1 and heater 16 control GN2Temperature,；And another way LN2By being supplied with the gaseous nitrogen of the first via after an electric control valve D2
Pipeline 4 is answered to converge, the gas-liquid mixture of mixing supply line 5 passes through a mass flowmenter being connected with control system 15 and temperature
Sensor 8 is spent, temperature pipe perforator 8 is platinum resistance temperature sensor, and adjusting mass flowmenter according to required temperature makes gas-liquid
It is mixed in a certain ratio to reach the temperature value of needs；Finally blending agent is sent into heat sink pipeline, chamber 1 is carried out
Temperature controls, because relying primarily on radiation heat transfer, temperature is opposite sufficiently stable with heat convection, to solve convective zone under low pressure
The temperature drift come.Temperature is adjustable in+50 DEG C~-100 DEG C, temperature fluctuation ± 1 DEG C.
Nitrogen exchange system (dehumidification system) is made of vaporizer 17, gas exhaust piping 10 and chamber air bleeding valve D4, experiment
Case air bleeding valve D4 is electric control valve.In order to ensure carry out simulation test when, heat sink 2 and 1 surface of chamber will not be because of humidity
Excessive and frosting, therefore need to control humidity in chamber 1 before being tested.Nitrogen exchange system is through overflash
Device 17 is by LN2It is converted to GN2The gas exhaust piping valve D3 being connected with controller by one is sent into chamber, gas exhaust piping valve
Door D3 is electric control valve.Since it is desired that keeping standard atmospheric pressure constant, so gas exhaust piping can be beaten according to pressure in chamber
Push And Release closes gas exhaust piping valve D3 and chamber air bleeding valve D4, can be tested when humidity is below 1%.
Vacuum system is by screw pump 12, molecular pump 13, electric control valve D5, electric control valve D6 and drying nitrogen group
At deflating since it is considered that product is placed under environment under low pressure or the problem of testing equipment leakproofness itself, simulating a certain magnitude
When pressure reaches desired value, extract system is worked at the same time with air compensating system, i.e., by electric control valve D6 bleeding regulatings rate and
Feed rate makes what whole system reached that a kind of dynamic equilibrium can stablize to meet simulated conditions, and pressure can be in 0Pa~104Pa
It adjusts.
Refrigeration system, nitrogen exchange system, vacuum system are connect with control system, and control system is according to feedback information pair
Each subsystem is controlled.
Embodiment：Experimental condition：Simulate environment at China plateau elevation 4267m.By being obtained to height above sea level conversion：Gas
Pressure value：59514Pa, environment mean temperature：-12.7℃.
1, given the test agent is placed in chamber on objective table, closes chamber door；Liquid nitrogen accumulator tank hand valve is opened, liquid nitrogen is made to pass through
Vaporizer 17, heater 16 are converted into room temperature GN2, open gas exhaust piping valve D3 and chamber air bleeding valve D4 (keep one big
Air pressure is constant, maintains certain pressure constant when the speed of exhaust is identical as deflation rate using principle of mobile equilibrium) into promoting the circulation of qi
Body is replaced, and chamber air bleeding valve D4 is electric control valve, and the humidity fed back according to humidity sensor 11 is to gas exhaust piping valve D3
And chamber air bleeding valve D4 is adjusted, and thinks to replace completely when humidity is less than 1% or less, control system will be closed and is vented
Pipe valve D3 and chamber air bleeding valve D4 complete replacement process.
2, simulated environment pressure, opening screw pump 12 first opens electric control valve D6, to experiment after gas displacement completely
Case is evacuated, and when reaching near target pressure value 59514Pa, the value of feedback that pressure sensor 9 obtains is adjusted by PID and is vented
Pipe valve D3, electric control valve D6 and chamber air bleeding valve D4 reach dynamic equilibrium to maintain target pressure value constant.Due to
When reaching dynamic equilibrium, air inflow is very faint, therefore its influence to entire environment temperature later can be ignored.
3, heat sink simulated environment temperature is passed through LN in heat sink pipeline2And GN240 DEG C of temperature is arranged in mixture, heater 16
~50 DEG C to its heating of nitrogen.Just having started mixture temperature can continue to reduce, when platinum sensor feedback temperature reaches -12.7 DEG C
When left and right, PID is adjusted electric control valve D1, electric control valve D2 and flowmeter by feedback temperature, to which control is mixed
Complex ratios make platinum resistance temperature sensor feedback temperature stablize, and then hybrid refrigeration medium, which is passed through in heat sink vacuum pipe, makes
Experiment the temperature inside the box maintains in target temperature range.
4, when off-test, first by LN2Stopping is passed through heat sink, restores heat sink temperature to room temperature, then by heater
It opens gas exhaust piping valve D3 and is passed through GN into chamber2System is set to restore to normal pressure.
Claims (7)
1. it is a kind of can simulated high altitude climatic environment experimental rig, including chamber (1), refrigeration system, vacuum system and control
System, it is characterised in that：
The refrigeration system includes heat sink (2), liquid nitrogen supply line (3), gaseous nitrogen supply line (4) and mixing supply line
(5)；
Heat sink (2) are set in chamber (1), and heat sink (2) include heat sink pipeline, the liquid nitrogen supply line
(3), valve, the liquid nitrogen supply are both provided in gaseous nitrogen supply line (4), mixing supply line (5) and vacuum system
Pipeline (3) is connect with the entrance of mixing supply line (5) with the outlet of gaseous nitrogen supply line (4), the mixing supply pipe
The outlet on road (5) is connect with the medium inlet of heat sink pipeline, and the media outlet of heat sink pipeline leads on the outside of chamber；
The control system includes PLC control unit, data collecting system, temperature sensor (8) and pressure sensor (9)；Institute
State detection of the temperature sensor (8) for mixing the interior blending agent temperature of supply line (5)；The pressure sensor (9) is used for
The detection of chamber (1) interior pressure；The input terminal of the PLC control unit passes through data collecting system and temperature sensor (8)
And pressure sensor (9) connection, output end and liquid nitrogen supply line (3), the gaseous nitrogen supply line of the PLC control unit
(4), the valve connection being arranged in supply line (5) and vacuum system is mixed.
2. it is according to claim 1 it is a kind of can simulated high altitude climatic environment experimental rig, it is characterised in that：
Further include nitrogen exchange system, the nitrogen exchange system includes chamber air bleeding valve D4 and gas exhaust piping (10), described
Chamber air bleeding valve D4 is used for the discharge of Control experiment case (1) interior gas；It is additionally provided with exhaust pipe on the gas exhaust piping (10)
The entrance of road valve D3, the gas exhaust piping (10) are connect with gaseous nitrogen supply line (4), the outlet of the gas exhaust piping (10)
It is internal towards chamber (1)；
The control system further includes humidity sensor (11), and the humidity sensor (11) is for chamber (1) interior humidity
The output end of detection, the humidity sensor (11) is connected by the input terminal of data collecting system and PLC control unit, described
Gas exhaust piping valve D3 and chamber air bleeding valve D4 are connect with the output end of PLC control unit.
3. it is according to claim 1 or 2 it is a kind of can simulated high altitude climatic environment experimental rig, it is characterised in that：
The vacuum system includes the air extractor being connect with chamber (1), making-up air device, electric control valve D6 and motorized adjustment
Valve D5；The air extractor is connect by electric control valve D5 with making-up air device, and the air extractor passes through with making-up air device
Electric control valve D6 is connect with chamber (1), and the output end of electric control valve D5 and electric control valve D6 and PLC control unit connects
It connects.
4. it is according to claim 3 it is a kind of can simulated high altitude climatic environment experimental rig, it is characterised in that：
The air extractor is screw pump (12), and the making-up air device is molecular pump (13).
5. it is according to claim 1 it is a kind of can simulated high altitude climatic environment experimental rig, it is characterised in that：It is described heat sink
At least one thermocouple temperature sensor (14) for detecting experiment the temperature inside the box is additionally provided on pipeline.
6. it is according to claim 1 it is a kind of can simulated high altitude climatic environment experimental rig, it is characterised in that：The mixing
The mass flowmenter (15) for monitoring gaseous nitrogen and liquid nitrogen mixture flow rate is additionally provided on supply line (5).
7. it is according to claim 1 it is a kind of can simulated high altitude climatic environment experimental rig, it is characterised in that：The gaseous state
The heater (16) being connect with PLC control unit output end is additionally provided on nitrogen supply pipeline (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810149789.5A CN108479865A (en) | 2018-02-13 | 2018-02-13 | It is a kind of can simulated high altitude climatic environment experimental rig |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810149789.5A CN108479865A (en) | 2018-02-13 | 2018-02-13 | It is a kind of can simulated high altitude climatic environment experimental rig |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988018A (en) * | 2019-12-10 | 2020-04-10 | 南京玻璃纤维研究设计院有限公司 | Ultralow-temperature demisting temperature control box and detection method |
| CN111957358A (en) * | 2020-07-01 | 2020-11-20 | 重庆哈丁环境试验技术股份有限公司 | Comprehensive environmental test box capable of simulating plateau environment |
| CN112924876A (en) * | 2021-02-24 | 2021-06-08 | 重庆阿泰可科技股份有限公司 | Environmental test equipment suitable for hydrogen fuel new energy automobile engine |
| CN113368920A (en) * | 2021-06-07 | 2021-09-10 | 上海交通大学 | Large-scale high low temperature environment simulation test system of two cold sources |
| CN113405268A (en) * | 2021-06-16 | 2021-09-17 | 中科美其（天津）科技有限公司 | Refrigerating system based on environmental simulation test box |
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