CN110262587A - Intelligent controllable temperature formula Hopkinson pressure bar test low temperature loading device and temperature control method - Google Patents
Intelligent controllable temperature formula Hopkinson pressure bar test low temperature loading device and temperature control method Download PDFInfo
- Publication number
- CN110262587A CN110262587A CN201910454782.9A CN201910454782A CN110262587A CN 110262587 A CN110262587 A CN 110262587A CN 201910454782 A CN201910454782 A CN 201910454782A CN 110262587 A CN110262587 A CN 110262587A
- Authority
- CN
- China
- Prior art keywords
- temperature
- liquid nitrogen
- controller
- thermocouple
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 411
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 205
- 239000007788 liquid Substances 0.000 claims abstract description 143
- 238000012360 testing method Methods 0.000 claims abstract description 81
- 238000009834 vaporization Methods 0.000 claims abstract description 61
- 230000008016 vaporization Effects 0.000 claims abstract description 61
- 238000005485 electric heating Methods 0.000 claims abstract description 18
- 238000002474 experimental method Methods 0.000 claims abstract description 16
- 230000005619 thermoelectricity Effects 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 31
- 238000012545 processing Methods 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000005304 joining Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 description 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 2
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 description 2
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 230000002631 hypothermal effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
A kind of intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device, it includes liquid nitrogen container (17), liquid nitrogen vaporization bottle (12) and low-temperature test case (1), it is characterized in that being equipped with the first electric heating wire (13) in liquid nitrogen vaporization bottle (12), the first thermocouple (10) are installed in the outlet end of liquid nitrogen vaporization bottle (12), second electric heating wire (6) are installed in low temperature nitrogen delivery pipe (7), second thermocouple (30) are installed in low-temperature test case (1), second thermoelectricity side (30) is connected with the second thermoelectricity side Wireless connector system (31) communicated wirelessly with temperature controller (25), temperature controller (25) receives the temperature of the second thermocouple (30), to the working condition of control the second electric heating wire (6).The present invention effectively can provide uniform ultralow temperature for Hopkinson pressure bar experiment and test environment, and temperature range reduces the waste of liquid nitrogen at RT ~ -190 DEG C, achievees the purpose that energy saving.
Description
Technical field
The present invention relates to a kind of intelligent measuring technology, especially a kind of pair of test materials dynamically to ring under Different hypothermia state
The Hopkinson pressure bar test technology answered, specifically a kind of intelligent controllable temperature formula Hopkinson pressure bar test are loaded with low temperature
Device and temperature control method.
Background technique
Split hopkinson press bar (Split Hopkinson Pressure Bars, SHPB) experimental technique is research
Middle high strain-rate (102~104s-1) under material mechanical performance most important experimental method, be explosion with shock dynamics test
The important component of technology.Its core concept be the stress wave propagated in test club and meanwhile undertake load box test function,
Stress-displacement versus time relation that rod piece Yu sample end face are solved according to the information of stress wave propagation in bar, to obtain sample
Strain-stress relation.Therefore, since over half a century, split hopkinson press bar, which tests to have obtained, to be thoroughly discussed and extensively
General application.
With the progress of science and technology and the requirement of Clean Cutting, using liquid nitrogen as the advanced machining of effective coolant
Technology receives the extensive concern of people, including deep cooling cutting technology, cold grmding technology and low temperature micro-scale abrasive wear
Technology etc..Such as: when carrying out erosion processing to PDMS material with low temperature Micro abrasive jet, since PDMS material is in low temperature shape
Glassy transition under state and make its hardness improve 40 ~ 60%, to greatly reduce abrasive material insertion journey in process
Degree；For another example: diamond cutter cannot be used to process ferrous metal.And one scholar of the U.S. uses stainless steel using liquid nitrogen cooling system
Diamond cutter carries out turnery processing and greatly reduces tool wear since low temperature inhibits the diffusion and graphitization of carbon atom,
And achieve fabulous processing quality.But people are deep not enough to the understanding of the Material Removal Mechanism under low-temperature condition.Study carefully
The reason is that material processed low-temperature condition mechanical property compared with having relatively big difference under room temperature.Therefore, to material under low-temperature condition
The dynamic mechanical response test of material just has this very important engineering and significance of scientific research.
Currently, not yet specifically for the refrigeration system of Hopkinson bar experimental facilities, researcher is carrying out low temperature
Under state Hopkinson bar test in use refrigeration system is essentially all to require and designed, designed according to specific experiments.
Notification number is that the patent of CN104913971A discloses a kind of Hopkinson bar low temperature test device, which includes
Nitrogen gas generating device, heat insulation experiment device and nitrogen conduit obtain the experimental temperature of range relatively wide (RT ~ -175 DEG C)；Bulletin
Number a kind of temperature-compensating for real-time cryogenic separation formula Hopkinson pressure bar experiment is disclosed for the patent of CN108776060A
Device, the device include environmental chamber at low temperature, low temperature liquid nitrogen bottle and pulsometer.The device by adjust pressure regulator valve to required pressure simultaneously
Stablize output gas, obtains RT ~ -100 DEG C of low-temperature test environment.Hopkinson bar disclosed in above-mentioned two patent is with low
Warm loading device can provide required a certain range of low temperature environment in test process, but be inevitably present following three aspects
Problem: 1. it is difficult to provide effectively ultralow temperature test environment；2. being difficult to carry out real-time monitoring to the temperature of test environment；3. due to
Low temperature nitrogen is directly accessed in incubator, it is difficult to required low-temperature test environment is built in incubator in the short time, and low
Warm environment temperature field distribution is uneven.
Summary of the invention
The purpose of the present invention is exist to be difficult in short-term for existing Hopkinson bar experimental rig low temperature loading device
It is interior to build uniform low-temperature test environment and be difficult to the technical problems such as real-time temperature control, design a kind of intelligent controllable temperature formula Hope gold
Gloomy compression bar test low temperature loading device, while a kind of corresponding temperature control method being provided.
Technical solution of the present invention first is that:
A kind of intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device, it includes liquid nitrogen container 17, liquid nitrogen vaporization bottle
12 and low-temperature test case 1, liquid nitrogen container 17 is connected by liquid nitrogen delivery hose 18 with liquid nitrogen vaporization bottle 12, and liquid nitrogen vaporization bottle 12 passes through
Low temperature nitrogen is sent into low-temperature test case 1 and is carried out to test sample 38 by low temperature nitrogen delivery pipe 7 and corresponding law temperature joining pipe
It is cooling, it is characterized in that the first electric heating wire 13 is installed in liquid nitrogen vaporization bottle 12, the first electric heating wire 13 and 20 electricity of controller
Gas connection, controller 20 are electrically connected with the liquid nitrogen solenoid valve 16 being mounted on liquid nitrogen delivery hose 18 simultaneously；In liquid nitrogen vaporization
The outlet end of bottle 12 is equipped with the first thermocouple 10, and the first thermocouple 10 is connected with first communicated wirelessly with controller 20
Thermocouple Wireless connector system 11, controller 20 is according to the temperature control of 12 outlet end of liquid nitrogen vaporization bottle of the first thermocouple measurement
Make the on-off of the first electric heating wire 13 and the unlatching of liquid nitrogen solenoid valve 16；Second electricity is installed to add in low temperature nitrogen delivery pipe 7
Heated filament 6, the second electric heating wire 6 are electrically connected with temperature controller 25, are equipped with the second thermocouple 30 in low-temperature test case 1, and second
Thermoelectricity side 30 is connected with the second thermoelectricity side Wireless connector system 31 communicated wirelessly with temperature controller 25, and temperature controller 25 receives
The temperature of second thermocouple 30, thus the working condition of the second electric heating wire 6 of control.
The law temperature joining pipe is pipe screw thread connecting tube 5 or low temperature nitrogen delivery pipe 38；Pipe screw thread connecting tube 5 and installation
The inlet end of spiral low temperature nitrogen delivery pipe 36 in low-temperature test case 1 is connected, spiral low temperature nitrogen delivery pipe 36
It is wrapped in input lever 2 and projects on bar 32；The outlet side of low temperature nitrogen delivery pipe 38 is directly connected with low-temperature test case 1,
The low temperature fan 40 of samming is symmetrically installed with around low-temperature test case 1.
The spiral low temperature nitrogen delivery pipe 36 medial surface opposite with test sample 37 is equipped with venthole 33, with
It is directly acted on test sample 37 convenient for low temperature nitrogen.
Spiral low temperature nitrogen delivery pipe arrival end insulating layer 4 is coated in the pipe screw thread connecting tube 5, described is low
Low temperature nitrogen delivery pipe insulating layer 30 is coated in warm nitrogen delivery pipe 38.
Second thermocouple 30 is mounted at 5-8 millimeters from 37 surrounding of test sample, and the second thermocouple 30 will measure
Sample ambient temperature transmitted in the form of radio wave the second thermoelectricity side Wireless connector system 31, by temperature controller
Radio receiving module 29 in 25 is received.
The liquid nitrogen delivery hose 18 passes through the inlet end of right flange 14 and right flange gasket 15 and liquid nitrogen vaporization bottle 12
It is connected；Low temperature nitrogen delivery pipe 7 is connected by left flange 8 and left flange gasket 9 with the outlet side of liquid nitrogen vaporization bottle 12；Institute
12 outside wall surface of liquid nitrogen vaporization bottle stated is applied with heat-insulating material, controls the low temperature nitrogen excessive temperature rise being vaporized, and improves liquid nitrogen vapour
Change the precision of efficiency
The installation site of first thermocouple 10 is slightly above the left air outlet bottom of liquid nitrogen vaporization bottle 12, in order to which basis should
The temperature of position carries out real-time control to the filling of liquid nitrogen, and liquid nitrogen is avoided to enter in low temperature nitrogen delivery pipe 7.
Radio receiving module 23 in controller 20 receives the temperature signal that the first thermocouple 10 is surveyed, and is transmitted
To controller signals processing module 22, by the signal comparator in controller signals processing module 22 by 10 institute of the first thermocouple
The temperature signal of survey and T=- 196 °C of liquid nitrogen temperature of setting compare, the comparing result in controller signals processing module 22
Liquid nitrogen solenoid valve controller 21, the control of liquid nitrogen solenoid valve controller 21 and liquid nitrogen solenoid valve 16 will be sent to as electronic signals
Device electrical connection processed, then carries out real-time control to the on-off of liquid nitrogen solenoid valve 16；Radio in temperature controller 25 receives mould
After block 29 receives temperature signal measured by the second thermocouple 30, it is transformed into electric signal and sends at temperature controller signal
Module 28 is managed, observed temperature and set temperature are compared processing, its comparing result passed by temperature controller signal processing module 28
Current regulating module 27 is given, current regulating module 27 is electrically connected with the second heating wire controller 26, then controls
The calorific value of two heating wire 6 is realized and carries out on-line intelligence adjusting to the temperature in low-temperature test case 1.
The thermal discharge Q of second heating wire 62 putIt is determined by Hopkinson pressure bar test experiments environment required temperature,
That is: Q2 put=cm△t；
In formula: c is the specific heat capacity of nitrogen: 1.083KJ/ (KG. DEG C)；M is the conveying quality of liquid nitrogen；△ t is the second thermocouple institute
The difference of setting value in thermometric angle value and temperature controller；
The first thermocouple Wireless connector system 11 and the second thermocouple Wireless connector system 31 carry out different address
Coding, it is ensured that it issues the radio wave with temperature signal can be respectively by controller radio receiving module 23 and temperature control
Instrument radio receiving module 29 is received, and avoids interfering with each other.
Technical solution of the present invention second is that:
A kind of temprature control method of Hopkinson pressure bar experiment low temperature loading device, it is characterized in that it includes the following steps:
(1) firstly, a heating wire is fixedly mounted in liquid nitrogen vaporization bottle and low temperature nitrogen delivery pipe；
(2) secondly, installing a thermocouple at slightly above liquid nitrogen vaporization bottle left end gas outlet and in low-temperature test case respectively, and
Temperature measured by thermocouple is transferred to the thermocouple wireless connector with radio transmitting module, thermocouple by conducting wire
Wireless connector sends measured temperature signal in the form of radio wave；
(3) third installs radio reception module on controller and temperature controller, for receiving the first thermocouple and the second thermoelectricity
Temperature signal measured by idol；
(4) the radio receiving module in controller receives the radio wave of the first thermocouple wireless connector sending, passes through
Controller radio processing module, by measured temperature ask set temperature compare with control the unlatching of liquid nitrogen solenoid valve with
Closure can close liquid nitrogen solenoid valve if the temperature value that measurement obtains is equal to setting value (T=- 196 °C of liquid nitrogen temperature), if
Measured obtained temperature value is lower than setting value (T=- 196 °C of liquid nitrogen temperature), then keeps the opening state of liquid nitrogen solenoid valve；
(5) the radio receiving module in temperature controller receives the radio wave of the second thermocouple wireless connector sending, passes through
Measured temperature is made the difference with set temperature, and its difference is scaled electric current tune by temperature controller radio processing module
Signal is saved, the calorific value of the second heating wire is controlled by the current regulating module in temperature controller.
Beneficial effects of the present invention:
The present invention can effectively be Hopkinson by the temperature in effectively control liquid nitrogen vaporization and intelligent control low-temperature test case
Compression bar experiment provides uniform ultralow temperature and tests environment, and temperature range is at RT ~ -190 DEG C.It is uneven to change previous through type refrigeration
The drawbacks such as even and effect is poor, reduce the waste of liquid nitrogen, achieve the purpose that energy saving.
The present invention is connected with the thermocouple of radio transmitting system using configuration in liquid nitrogen vaporization bottle and low-temperature test case
Actual measurement carried out to liquid nitrogen vaporization bottle outlet temperature and low-temperature test the temperature inside the box respectively, and by measured actual temperature
Signal is wirelessly transferred in a manner of different frequency range.Two kinds of different frequency range radio waves with temperature signal are installed in temperature
Control instrument is received with the radio wave receiving module in controller, then is transmitted to corresponding signal processing module, by temperature
Signal sends corresponding control module to, and the calorific value of on-off and the second heating wire to liquid nitrogen solenoid valve controls, then
Accomplish to carry out accuracy controlling to the temperature in low-temperature test case.Pass through uniformly leachy spiral low temperature in low-temperature test case
Nitrogen delivery pipe is quickly obtained in test two fans of chamber interior wall balanced configuration come the mode for accelerating the gas inside it to flow
Obtain required uniform temperature atmosphere.It, can be effective by effectively controlling the temperature in liquid nitrogen vaporization and intelligent control low-temperature test case
Ground provides uniform ultralow temperature for Hopkinson pressure bar experiment and tests environment, and temperature range reduces liquid nitrogen at RT ~ -190 DEG C
Waste achievees the purpose that energy saving.
The interim cold cooling unit that the present invention also can be used as article uses.
Detailed description of the invention
Fig. 1 is the device of the invention operation principle schematic diagram.
Fig. 2 is liquid nitrogen vaporization apparatus structure schematic diagram of the invention.
Fig. 3 is spiral low-temperature test box structure schematic diagram of the invention.
Fig. 4 is circulation type low-temperature test box structure schematic diagram of the invention.
Fig. 5 is low temperature temperature measurement box schematic diagram of base structure of the invention.
Fig. 6 is that liquid nitrogen vaporization device China liquid nitrogen of the invention effectively vaporizes service routine flow chart.
Control flow chart when Fig. 7 is low-temperature test case environment temperature intelligent control of the invention.
In figure: 1, low-temperature test case；2, input lever；3, compression bar is perforated；4, spiral low temperature nitrogen delivery pipe arrival end is protected
Warm layer；5, pipe screw thread connecting tube；6, the second electric heating wire；7, low temperature nitrogen delivery pipe；8, Zuo Falan；9, left flange gasket；10,
First thermocouple；11, the first thermocouple Wireless connector system；12, liquid nitrogen vaporization bottle；13, the first electric heating wire；14, right method
It is blue；15, right flange gasket；16, liquid nitrogen solenoid valve；17, liquid nitrogen container；18, liquid nitrogen delivery hose；19, liquid nitrogen container pressure gauge；20,
Controller；21, liquid nitrogen solenoid valve control module；22, controller radio processing module；23, controller radio receiving module；
24, the first electric heating wire control module；25, temperature controller；26, the second electric heating wire control module；27, temperature controller current regulation mould
Block；28, temperature controller radio processing module；29, temperature controller radio receiving module；30, the second thermocouple；31, the second thermoelectricity
Even Wireless connector system；32, bar is projected；33, venthole；34, low-temperature test bottom seat；35, adjusting foot stand；36, spiral
Low temperature nitrogen delivery pipe；37, test sample；38, low temperature nitrogen delivery pipe；39, low temperature nitrogen delivery pipe insulating layer；40, low temperature
Fan.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
Embodiment one.
As shown in Figs. 1-5.
Fig. 1 show a kind of working principle signal of intelligent controllable temperature formula Hopkinson pressure bar test low temperature loading device
Figure, the device include being pressurized the structures such as liquid nitrogen container 17, liquid nitrogen vaporization bottle 12, low-temperature test case 1 certainly, including have radio
The thermocouple 10/30(model of module can are as follows: the UWRTD-2 model of OMEGA company, T-type thermocouple), radio receiving module
23/29(model can are as follows: the UWTC-REC1 multi-channel industrial recipient of OMEGA company), the first heating wire temperature controller 20,
Temperature controller current regulating module (being realized using pulse width modulation type schematic circuit) 26, spiral low temperature nitrogen delivery pipe
36 or low temperature dedicated fan 40, the controller 20 is responsible for providing power supply to the first heating wire 13, and adjusts liquid nitrogen vaporization effect
Rate avoids having little time to vaporize from the liquid nitrogen excess outflow in pressurization liquid nitrogen container 17, flows into low-temperature test case 1, interfere low temperature
The accuracy that temperature regulates and controls in test box 1；The temperature controller 25 is warm by the temperature surveyed to the second thermocouple 30 and setting
The comparison of degree then adjusts the temperature in low-temperature test case 1 to adjust the calorific value of the second heating wire 6.
Details are as follows:
A kind of intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device, it includes:
One liquid nitrogen vaporization device, the liquid nitrogen vaporization device mainly include from pressurization liquid nitrogen container 17, liquid nitrogen vaporization bottle 12, right company
Acting flange 14, left connecting flange 8, the first heating wire 13, liquid nitrogen delivery hose 18 and low temperature nitrogen delivery pipe 7, the liquid nitrogen
Vaporization bottle 12 is carried out detachably by right flange 14 with left flange 8 with liquid nitrogen delivery hose 18 and low temperature nitrogen delivery pipe 7 respectively
Connection, 12 bottom of liquid nitrogen vaporization bottle is configured with the first heating wire 13, wherein controlling the electrical connection of the first heating wire 13
Line is pierced by the bellmouth of liquid nitrogen vaporization bottle container wall by sealing-plug, also arrangement the at 12 left end of liquid nitrogen vaporization bottle
One thermocouple 10, position is slightly above the left air outlet bottom of liquid nitrogen vaporization bottle 12, in order to which the temperature according to the position is to liquid
The filling of nitrogen carries out real-time control, and liquid nitrogen is avoided to enter in low temperature nitrogen delivery pipe 7；
One liquid nitrogen vaporization control system, the liquid nitrogen vaporization system mainly includes the first thermocouple 10, the first thermocouple is wireless
Connector 11, controller 20 and controller radio receiving module 23, controller processing module 22 and the first heating wire control mould
Block 24, the liquid nitrogen flow into liquid nitrogen vaporization bottle 12 from from pressurization liquid nitrogen container 17 by liquid nitrogen delivery hose 18, liquid nitrogen vapour
Changing the first heating wire 13 in bottle 12 has fixed heating power, and the first heating wire 13 provides heat and promotes liquid nitrogen fast and effective
Vaporization, so that liquid nitrogen vaporization is the low temperature nitrogen that temperature is -190 °C, it is effectively cold in order to be carried out for next step low-temperature test case 1
But；
One intelligent temperature control system, the intelligent temperature control system mainly include the second heating wire 6, second the 30, second heat of thermocouple
Galvanic couple wireless connector 31, temperature controller 25, temperature controller radio receiving module 29 and the second heating wire control module 26, by liquid
After nitrogen vaporizes the vaporization of bottle 12, low temperature nitrogen enters in low-temperature test case 1 by cryogenic transfer pipe 7, in the cryogenic transfer pipe 7
Arrange the second heating wire 6, calorific value is controlled by the second heating wire control module 26.The thermal discharge Q of second heating wire 62 putBy suddenly
Pu Jinsen compression bar test experiments environment required temperature determines,
That is: Q2 put=cm△t；
In formula: c is the specific heat capacity of nitrogen: 1.083KJ/kg (KG. DEG C)；M is the conveying quality of liquid nitrogen, kg；△ t is the second heat
The difference of setting value in galvanic couple measured temperature value and temperature controller.
Arrange that the second thermocouple 30, the second thermocouple 30 carry out the temperature in low-temperature test case 1 real in low-temperature test case 1
When measure, and the radio wave for having temperature signal, the nothing in temperature controller 25 are issued by the second thermocouple wireless connector 31
Line electricity receiving module 29 is for receiving the collected temperature signal of the second thermocouple institute；
One low-temperature test case 1, low-temperature test case 1 are mounted on low-temperature test bottom seat 34, the lower part of low-temperature test bottom seat 34
Adjusting foot stand 35 is installed, as shown in Figure 5.When it is implemented, low-temperature test case can be there are two types of implementation:
Mode one: spiral low temperature nitrogen delivery pipe 36 by low-temperature test case 1 incident bar 2, project bar 32 and test sample
37 are surrounded, and the inner wall of spiral low temperature nitrogen delivery pipe 36 processes venthole 33.As shown in Figure 3.
Mode two: the left and right sides in low-temperature test case 1 is respectively arranged a low temperature dedicated fan 40, the dedicated wind of low temperature
Fan needs balanced configuration, and the common effect of two ways is that the quick temperature control of the ambient enviroment of test sample can be enable, and
Uniformity of temperature profile.As shown in Figure 4.
The inlet of the liquid nitrogen vaporization bottle 12 and gas outlet pass through right flange 14 and left flange 8 respectively and liquid nitrogen conveys
Hose 18 is detachably connected with low temperature nitrogen delivery pipe 7, and first thermocouple 10 electrically connects with the first heating wire 13
Wiring is pierced by from the bellmouth of liquid nitrogen vaporization bottle container wall by sealing-plug.As shown in Figure 2.
In the left flange 8 of liquid nitrogen vaporization bottle 12, right flange 14 and liquid nitrogen delivery hose 18, the company of low temperature nitrogen delivery pipe 7
Low temperature flange gasket 15 is installed to be sealed between junction.As shown in Figure 2.
The first thermocouple 10, position and liquid nitrogen vaporization bottle 12 are configured at the 12 left end gas outlet of liquid nitrogen vaporization bottle
Left air outlet bottom flushes, and the first thermocouple 10 and the first thermocouple wireless connector 11 are electrically connected, the first thermocouple 10
Measured temperature signal is issued in the form of radio wave, and is received by the radio receiving module 23 in controller.
The first thermocouple 10 is installed at the 12 left end gas outlet of liquid nitrogen vaporization bottle, with measurement liquid nitrogen vaporization bottle
Temperature at 12 left ends gas outlet indicates liquid nitrogen spilling when measurement temperature reaches liquid nitrogen temperature (T=- 196 °C), and through liquid
Nitrogen vaporizes the outlet of 12 left end of bottle and enters in low temperature nitrogen delivery pipe 7,10 real-time measurement liquid nitrogen vaporization bottle of the first thermocouple, 12 left end
Temperature and display at gas outlet are on the controller.
By controller 20 to the temperature at 12 left end gas outlet of liquid nitrogen vaporization bottle compared with set temperature, to control liquid
The on-off of nitrogen solenoid valve 16 then controls effective vaporization of liquid nitrogen, prevents liquid nitrogen from entering in low-temperature test case.
The second heating wire 6 is configured in the low temperature nitrogen delivery pipe 7, the electrical cable of the second heating wire 6 is equally logical
Sealing-plug is crossed to be pierced by from the bellmouth of low temperature nitrogen conveying tube wall.
The low-temperature test case, mode convey first is that configuring a spiral low temperature nitrogen in low-temperature test case 1
Pipe 36, inner surface of tube wall have been evenly arranged venthole 33.Spiral low temperature nitrogen delivery pipe 36 is made of brass material, passes through
Change the screw pitch of the delivery pipe to realize that the uniformity cooling to low-temperature test case 1 is adjusted.Experiment shows: screw pitch exists
Cold air heat exchange when 3 ~ 5cm is more uniform.The spiral low temperature nitrogen delivery pipe 36 carries out removable with low temperature nitrogen delivery pipe 7
Unload the pipe screw thread connection of formula.
The low-temperature test case, mode first is that the left and right sides in low-temperature test case 1 be respectively arranged one it is low
Warm dedicated fan 40, low temperature dedicated fan 40 need balanced configuration, and the common effect of two ways is that test sample can be made
Ambient enviroment can quick temperature control, and uniformity of temperature profile.
It there also is provided the second thermocouple 30 in the low-temperature test case, the position of the second thermocouple 30 is located at around sample
At 5 ~ 8mm, the second thermocouple 30 transmits the sample ambient temperature measured by way of radio wave, by temperature controller
Radio receiving module 29 received.
The Hopkinson pressure bar experiment is RT with the available effective uniform low-temperature environment temperature of low temperature loading device
~-190°C。
Embodiment two.
As illustrated in figs. 5-7.
A kind of temprature control method of Hopkinson pressure bar experiment low temperature loading device, it includes the following steps:
(1) firstly, a heating wire is fixedly mounted in liquid nitrogen vaporization bottle 12 and low temperature nitrogen delivery pipe 7；
(2) secondly, installing a thermoelectricity at slightly above 12 left end gas outlet of liquid nitrogen vaporization bottle and in low-temperature test case 1 respectively
It is even, and temperature measured by thermocouple is transferred to by the thermocouple wireless connector with radio transmitting module by conducting wire,
Thermocouple wireless connector sends measured temperature signal in the form of radio wave；
(3) third installs radio reception module on controller 20 and temperature controller 25, for receiving the first thermocouple 10 and the
Temperature signal measured by two thermocouples 30；
(4) the radio receiving module 23 in controller receives the radio wave of the first thermocouple wireless connector 10 sending,
By controller radio processing module 22, ask that set temperature is compared to control liquid nitrogen solenoid valve 16 for measured temperature
Open the light and be closed, if the temperature value that measurement obtains is equal to setting value (T=- 196 °C of liquid nitrogen temperature), liquid nitrogen electricity can be closed
Magnet valve 16 keeps liquid nitrogen solenoid valve 16 if measured obtained temperature value is lower than setting value (T=- 196 °C of liquid nitrogen temperature)
Opening state；
(5) the radio receiving module 29 in temperature controller 25 receives the radio of the second thermocouple wireless connector 31 sending
Wave makes the difference measured temperature with set temperature, and its difference is converted by temperature controller radio processing module 28
For current regulating signal, the calorific value of the second heating wire 6 is controlled by the current regulating module 27 in temperature controller.
Although above-mentioned have been shown and described the embodiment of the present invention, it is to be understood that above-described embodiment is example
Property, it should not be understood as limitation of the invention, those skilled in the art is not the case where departing from the principle of the present invention and objective
Under can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.
Part that the present invention does not relate to is the same as those in the prior art or can be realized by using the prior art.
Claims (10)
1. a kind of intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device, it includes liquid nitrogen container (17), liquid nitrogen vapour
Change bottle (12) and low-temperature test case (1), liquid nitrogen container (17) is connected by liquid nitrogen delivery hose (18) with liquid nitrogen vaporization bottle (12), liquid
Nitrogen vaporizes bottle (12) and low temperature nitrogen is sent into low-temperature test case by low temperature nitrogen delivery pipe (7) and corresponding law temperature joining pipe
(1) test sample (38) is cooled down in, it is characterized in that the first electric heating wire (13) are installed in liquid nitrogen vaporization bottle (12),
First electric heating wire (13) and controller (20) are electrically connected, controller (20) simultaneously be mounted on liquid nitrogen delivery hose (18)
Liquid nitrogen solenoid valve (16) electrical connection；It is equipped with the first thermocouple (10) in the outlet end of liquid nitrogen vaporization bottle (12), the first heat
Galvanic couple (10) is connected with the first thermocouple Wireless connector system (11) communicated wirelessly with controller (20), controller
(20) on-off of the first electric heating wire (13) is controlled according to the temperature of liquid nitrogen vaporization bottle (12) outlet end of the first thermocouple measurement
And the unlatching of liquid nitrogen solenoid valve (16)；Second electric heating wire (6), the second electric heating are installed in low temperature nitrogen delivery pipe (7)
Silk (6) and temperature controller (25) are electrically connected, and are equipped in low-temperature test case (1) the second thermocouple (30), the second thermoelectricity side
(30) it is connected with the second thermoelectricity side Wireless connector system (31) communicated wirelessly with temperature controller (25), temperature controller (25) connects
The temperature of the second thermocouple (30) is received, thus the working condition of control the second electric heating wire (6).
2. intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device according to claim 1, it is characterized in that
The law temperature joining pipe is pipe screw thread connecting tube (5) or low temperature nitrogen delivery pipe (38)；Pipe screw thread connecting tube (5) be mounted on
The inlet end of spiral low temperature nitrogen delivery pipe (36) in low-temperature test case (1) is connected, spiral low temperature nitrogen delivery pipe
(36) it is wrapped in input lever (2) and projects on bar (32)；The outlet side of low temperature nitrogen delivery pipe (38) directly with low-temperature test case
(1) it is connected, the low temperature fan (40) of samming is symmetrically installed with around low-temperature test case (1).
3. intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device according to claim 2, it is characterized in that
The spiral low temperature nitrogen delivery pipe (36) and test sample (37) opposite medial surface is equipped with venthole (33), so as to
It is directly acted on test sample (37) in low temperature nitrogen.
4. intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device according to claim 2, it is characterized in that
Spiral low temperature nitrogen delivery pipe arrival end insulating layer (4), the cryogenic nitrogen are coated in the pipe screw thread connecting tube (5)
Low temperature nitrogen delivery pipe insulating layer (30) is coated on letter shoot (38).
5. intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device according to claim 1, it is characterized in that
Second thermocouple (30) is mounted at surrounding 5-8 millimeters from test sample (37), and the second thermocouple (30) is by what is measured
Sample ambient temperature is transmitted in the form of radio wave the second thermoelectricity side Wireless connector system (31), by temperature controller
(25) the radio receiving module (29) in is received.
6. intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device according to claim 1, it is characterized in that
The liquid nitrogen delivery hose (18) passes through the inlet end of right flange (14) and right flange gasket (15) and liquid nitrogen vaporization bottle (12)
It is connected；Low temperature nitrogen delivery pipe (7) passes through the outlet side of left flange (8) and left flange gasket (9) and liquid nitrogen vaporization bottle (12)
It is connected；Described liquid nitrogen vaporization bottle (12) outside wall surface is applied with heat-insulating material, controls the low temperature nitrogen excessive temperature rise being vaporized,
Improve the precision of liquid nitrogen vaporization efficiency.
7. intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device according to claim 1, it is characterized in that
The installation site of first thermocouple (10) is slightly above the left air outlet bottom of liquid nitrogen vaporization bottle (12), in order to which basis should
The temperature of position carries out real-time control to the filling of liquid nitrogen, and liquid nitrogen is avoided to enter in low temperature nitrogen delivery pipe (7).
8. intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device according to claim 1, it is characterized in that
Radio receiving module (23) in controller (20) receives the temperature signal that the first thermocouple (10) are surveyed, and is transferred to
Controller signals processing module (22), by the signal comparator in controller signals processing module (22) by the first thermocouple
(10) temperature signal surveyed and the liquid nitrogen temperature of setting (T=- 196 °C) compare, in controller signals processing module (22)
Comparing result will send to as electronic signals liquid nitrogen solenoid valve controller (21), liquid nitrogen solenoid valve controller (21) and liquid
The control device of nitrogen solenoid valve (16) is electrically connected, and then carries out real-time control to the on-off of liquid nitrogen solenoid valve (16)；Temperature controller
(25) after the radio receiving module (29) in receives temperature signal measured by the second thermocouple (30), it is transformed into electricity
Signal is simultaneously sent to temperature controller signal processing module (28), and temperature controller signal processing module (28) is by observed temperature and set temperature
Processing is compared, its comparing result is sent to current regulating module (27), current regulating module (27) and the second heating wire
Controller (26) is electrically connected, and the calorific value of the second heating wire (6) is then controlled, and is realized in low-temperature test case (1)
Temperature carries out on-line intelligence adjusting.
9. intelligence controllable temperature formula Hopkinson pressure bar test low temperature loading device according to claim 1, it is characterized in that
The thermal discharge Q of second heating wire (6)2 putIt is determined by Hopkinson pressure bar test experiments environment required temperature,
That is:；Q2 put=cm△t
In formula: c is the specific heat capacity of nitrogen: 1.083KJ/ (KG. DEG C)；M is the conveying quality of liquid nitrogen；△ t is the second thermocouple institute
The difference of setting value in thermometric angle value and temperature controller；
The first thermocouple Wireless connector system (11) and the second thermocouple Wireless connector system (31) carry out differently
The coding of location, it is ensured that it issues the radio wave with temperature signal can be respectively by controller radio receiving module (23)
Received with temperature controller radio receiving module (29), avoids interfering with each other.
10. a kind of Hopkinson pressure bar experiment temprature control method of low temperature loading device, it is characterized in that it includes following step
It is rapid:
(1) firstly, a heating wire is fixedly mounted in liquid nitrogen vaporization bottle and low temperature nitrogen delivery pipe；
(2) secondly, installing a thermocouple at slightly above liquid nitrogen vaporization bottle left end gas outlet and in low-temperature test case respectively, and
Temperature measured by thermocouple is transferred to the thermocouple wireless connector with radio transmitting module, thermocouple by conducting wire
Wireless connector sends measured temperature signal in the form of radio wave；
(3) third installs radio reception module on controller and temperature controller, for receiving the first thermocouple and the second thermoelectricity
Temperature signal measured by idol；
(4) the radio receiving module in controller receives the radio wave of the first thermocouple wireless connector sending, passes through
Controller radio processing module, by measured temperature ask set temperature compare with control the unlatching of liquid nitrogen solenoid valve with
Closure can close liquid nitrogen solenoid valve if the temperature value that measurement obtains is equal to setting value (T=- 196 °C of liquid nitrogen temperature), if
Measured obtained temperature value is lower than setting value (T=- 196 °C of liquid nitrogen temperature), then keeps the opening state of liquid nitrogen solenoid valve；
(5) the radio receiving module in temperature controller receives the radio wave of the second thermocouple wireless connector sending, passes through
Measured temperature is made the difference with set temperature, and its difference is scaled electric current tune by temperature controller radio processing module
Signal is saved, the calorific value of the second heating wire is controlled by the current regulating module in temperature controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454782.9A CN110262587B (en) | 2019-05-29 | 2019-05-29 | Low-temperature loading device and temperature control method for intelligent temperature-controllable Hopkinson pressure bar test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454782.9A CN110262587B (en) | 2019-05-29 | 2019-05-29 | Low-temperature loading device and temperature control method for intelligent temperature-controllable Hopkinson pressure bar test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110262587A true CN110262587A (en) | 2019-09-20 |
| CN110262587B CN110262587B (en) | 2023-11-03 |
Family
ID=67915759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910454782.9A Active CN110262587B (en) | 2019-05-29 | 2019-05-29 | Low-temperature loading device and temperature control method for intelligent temperature-controllable Hopkinson pressure bar test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110262587B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816350A (en) * | 2021-02-08 | 2021-05-18 | 天津大学 | Dual-purpose freeze thawing test box capable of being combined with Hopkinson bar |
| CN116255767A (en) * | 2023-03-27 | 2023-06-13 | 无锡爱思科仪器有限公司 | Liquid nitrogen freezing box for chip test |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203981478U (en) * | 2014-07-14 | 2014-12-03 | 湖南科技大学 | A kind of cooling system of realizing Hopkinson pressure bar low-temperature impact |
| CN104390847A (en) * | 2014-11-26 | 2015-03-04 | 苏州市职业大学 | Freezing apparatus for separated Hopkinson pole experiment measurement |
| CN105353811A (en) * | 2015-12-14 | 2016-02-24 | 丹东通达科技有限公司 | Intelligent temperature control system used for liquid nitrogen low temperature device and control method thereof |
| CN207351646U (en) * | 2017-10-27 | 2018-05-11 | 中车青岛四方机车车辆股份有限公司 | A kind of low temperature automates Hopkinson bar experimental provision |
| KR101884121B1 (en) * | 2017-04-12 | 2018-07-31 | 국방과학연구소 | Temperature test device of split hopkinson tensile bar |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913971A (en) * | 2015-06-26 | 2015-09-16 | 中国民用航空飞行学院 | Hopkinson rod low-temperature experiment device |
-
2019
- 2019-05-29 CN CN201910454782.9A patent/CN110262587B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203981478U (en) * | 2014-07-14 | 2014-12-03 | 湖南科技大学 | A kind of cooling system of realizing Hopkinson pressure bar low-temperature impact |
| CN104390847A (en) * | 2014-11-26 | 2015-03-04 | 苏州市职业大学 | Freezing apparatus for separated Hopkinson pole experiment measurement |
| CN105353811A (en) * | 2015-12-14 | 2016-02-24 | 丹东通达科技有限公司 | Intelligent temperature control system used for liquid nitrogen low temperature device and control method thereof |
| KR101884121B1 (en) * | 2017-04-12 | 2018-07-31 | 국방과학연구소 | Temperature test device of split hopkinson tensile bar |
| CN207351646U (en) * | 2017-10-27 | 2018-05-11 | 中车青岛四方机车车辆股份有限公司 | A kind of low temperature automates Hopkinson bar experimental provision |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816350A (en) * | 2021-02-08 | 2021-05-18 | 天津大学 | Dual-purpose freeze thawing test box capable of being combined with Hopkinson bar |
| CN116255767A (en) * | 2023-03-27 | 2023-06-13 | 无锡爱思科仪器有限公司 | Liquid nitrogen freezing box for chip test |
| CN116255767B (en) * | 2023-03-27 | 2023-10-20 | 无锡爱思科仪器有限公司 | Liquid nitrogen freezing box for chip test |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110262587B (en) | 2023-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20090095451A1 (en) | Method and apparatus for temperature change and control | |
| CN110262587A (en) | Intelligent controllable temperature formula Hopkinson pressure bar test low temperature loading device and temperature control method | |
| CN103792974B (en) | A kind of can the heating plate of quick meticulous adjustment temperature field space distribution and control method | |
| CN103344777B (en) | High-temperature and low-pressure oxygen dissociation environment test device for heat protection material | |
| CN107024946B (en) | High precision temperature control device and its temperature control method based on particle accelerator material irradiation | |
| CN101382478A (en) | Gravitational thermal analysis method and device for heating sample by microwave | |
| KR20030049836A (en) | Apparatus for heating and cooling semiconductor in handler for testing semiconductor | |
| CN108204994A (en) | A kind of material thermal shock resistance examination test device of superhigh temperature controlled atmosphere | |
| CN103677011B (en) | One is applicable to extend blackbody wide temperature range control system under vacuum condition | |
| CN108717029A (en) | Low-temperature control system and control method for vacuum QCM | |
| CN102176796B (en) | Non-contact heating method and device for high-temperature material | |
| US20210027927A1 (en) | Circulating device for cooling and heating superconducting magnet components at a controllable rate | |
| CN103853203A (en) | Cooling device | |
| CN106596150B (en) | Connection system is tested suitable for two cabins of spacecraft and antenna combined vacuum heat test | |
| US10627050B1 (en) | Cryogenic heating system | |
| CN116337929A (en) | Experimental device and method for testing heat transfer limit of non-uniform-power high-temperature heat pipe | |
| US3365563A (en) | Brazing tool | |
| CN102175665A (en) | Experiment device for simulating atomic oxygen oxidation ground of super-high temperature heat-protection material | |
| JP2000095198A (en) | Temperature control base plate and control method for the same | |
| KR101289013B1 (en) | The vacuum heat treatment apparatus which is possible to control a rapid temperature and the atmosphere | |
| JP2022127372A (en) | Superconducting magnet device | |
| CN204988323U (en) | Adjustable ultra -low temperature environment test device | |
| CN103808560B (en) | For 500-4.2K material static mechanical properties temperature control test macro | |
| CN212124151U (en) | Thermal forming equipment for plastic pipe fittings | |
| CN109799850B (en) | Temperature control system and temperature control method for multiple QCMs |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |