CN109668924A - Submerged gas liquefaction deep cooling experimental provision and its experimental method - Google Patents
Submerged gas liquefaction deep cooling experimental provision and its experimental method Download PDFInfo
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- CN109668924A CN109668924A CN201910055596.8A CN201910055596A CN109668924A CN 109668924 A CN109668924 A CN 109668924A CN 201910055596 A CN201910055596 A CN 201910055596A CN 109668924 A CN109668924 A CN 109668924A
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- 238000001816 cooling Methods 0.000 title claims abstract description 35
- 238000002474 experimental method Methods 0.000 title claims description 5
- 238000005057 refrigeration Methods 0.000 claims abstract description 37
- 238000007789 sealing Methods 0.000 claims abstract description 28
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002309 gasification Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 68
- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000006424 Flood reaction Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000002631 hypothermal effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
Abstract
A kind of cooling temperature control works well, easy to disassemble and replacement submerged gas liquefaction deep cooling experimental provision, including pedestal, mounting, refrigeration machine, the outside of refrigeration machine is provided with vacuum cylinder, the inside of vacuum cylinder has vacuum chamber, hollow cryogenic liquefying chamber is provided on the cold head of refrigeration machine, sealing edge of a knife blind flange is installed above cryogenic liquefying chamber, sealing edge of a knife blind flange has the annular edge of a knife, the section of the annular edge of a knife is wedge shaped, the annular edge of a knife passes through the pre- means of press seals of sealing surface of screw and cryogenic liquefying chamber, the percent thermal shrinkage for sealing edge of a knife blind flange is less than the percent thermal shrinkage of cryogenic liquefying chamber, so that the wedge-shaped cross section of the annular edge of a knife is gradually bonded closely as temperature is reduced with the sealing surface of cryogenic liquefying chamber, heat block and temperature sensor are installed on cryogenic liquefying chamber, heat block and temperature sensor are connected with temperature controller respectively, temperature The control instrument temperature intracavitary to accurately control cryogenic liquefying according to the temperature data control heat block that temperature sensor is passed back.
Description
Technical field
The invention belongs to the technical fields for Methods of The Properties of Materials At Low Temperature.
Background technique
In the Physical Properties of Low Temperature research of various metal materials and nonmetallic materials, require using liquid gas to material into
The method that row floods immersion, this method constantly cools down to cryogenic liquefying chamber under high vacuum environment by refrigeration machine, when temperature reaches
To the three phase point of gas, as the continuous injection liquefaction of gas is until cryogenic liquefying is intracavitary hydraulically full and floods tests exemplar,
This requires submerged gas liquefaction deep cooling experimental provisions to need to have the function of good vacuum environment and the external heat radiation of shielding,
It is also desirable to have the function of heating and cooling and inflation/deflation, and tests exemplar need to be easily changed.Cryogenic liquefying chamber is placed on refrigeration
On the second level cold head of machine, if but large-sized tests exemplar, cryogenic liquefying chamber inner space is limited and refrigeration machine power limit,
This just proposes requirements at the higher level to the thermal shielding capability of the heating and cooling of cryogenic liquefying chamber, cryogenic shield cover.
Summary of the invention
In order to solve the heating and cooling of cold liquefaction chamber, the thermal shielding capability of shielding case, the object of the present invention is to provide a kind of drops
Control temp works well, submerged gas liquefaction deep cooling experimental provision easy to disassemble and replacement.
The present invention provides submerged gas liquefaction deep cooling experimental provision, including pedestal, there is seat above the pedestal
Frame is vertically arranged with refrigeration machine on the mounting, and the outside of the refrigeration machine is provided with vacuum cylinder, the vacuum
The inside of cylinder has vacuum chamber, is provided with hollow cryogenic liquefying chamber, the cryogenic liquid on the cold head of the refrigeration machine
Change and sealing edge of a knife blind flange is installed above chamber, the sealing edge of a knife blind flange has the annular edge of a knife, the endless knife
The section of mouth is wedge shaped, and the annular edge of a knife passes through the pre- means of press seals of sealing surface of screw and cryogenic liquefying chamber, the sealing
The percent thermal shrinkage of edge of a knife blind flange is less than the percent thermal shrinkage of cryogenic liquefying chamber, so that the wedge-shaped cross section of the annular edge of a knife is dropped with temperature
It is low to be gradually bonded closely with the sealing surface of cryogenic liquefying chamber；Wherein, heat block and temperature are installed on the cryogenic liquefying chamber
Sensor, the heat block and temperature sensor are connected with temperature controller respectively, and the temperature controller is according to the temperature
The temperature data control that sensor is passed back the heat block temperature intracavitary to accurately control cryogenic liquefying；The depth
Cold liquefaction chamber has the first gas circuit, and first gas circuit is connected with inflation system, and the vacuum chamber has the second gas circuit, institute
The second gas circuit stated is connected with vacuum system, is provided with third gas circuit between first gas circuit and the second gas circuit, described
It is provided with third valve in first gas circuit, the first valve is provided in second gas circuit, is arranged in the third gas circuit
There is the second valve, the inflation system is provided with the 4th valve.
Preferably, the vacuum cylinder is connected and fixed by vacuum base flange with refrigeration machine.
Preferably, flange support rod, the flange they sup-port are provided with below the vacuum base flange
In on the pedestal.
Preferably, the refrigeration machine is G-M refrigeration machine.
Preferably, upper cover is installed, the upper cover is closely enclosed in vacuum by bolt at the top of the vacuum cylinder
Above room.
Preferably, the temperature controller is 4.2k ~ 20k ± 1mk to the control precision of the temperature of cryogenic liquefying chamber.
Preferably, first gas circuit is fixed on cryogenic liquefying chamber by laser welding.
Preferably, the outside of the refrigeration machine is provided with level-one cryogenic shield, and the cryogenic liquefying chamber is located at described
Level-one cryogenic shield inside, the level-one cryogenic shield is located at the internal vacuum chamber.
Preferably, the sealing surface of the cryogenic liquefying chamber is rough surface.
According to another aspect of the present invention, a kind of submerged gas liquefaction deep cooling experimental method is provided, including is walked as follows
It is rapid:
Vacuum step: in the intracavitary placement tests exemplar of cryogenic liquefying, start vacuum system, and open the first valve, the second valve
Door, third valve are closed the 4th valve, are vacuumized simultaneously to vacuum chamber and cryogenic liquefying chamber, pumpdown time >=6 hour；
Gas displacement step: when vacuum degree reaches 5 × 10-4After Pa, the second valve is closed, opens the 4th valve, starting inflation system
System needs liquefied gas to intracavitary be filled with of cryogenic liquefying, to normal pressure after close inflation system, close the 4th valve, open the
Three valves, the gas being filled with is extracted out, and vacuum degree reaches 5 × 10-4After Pa, it is repeated two more times identical inflation replacement process, is guaranteed
The intracavitary free from admixture gas of cryogenic liquefying；
Cooling step: refrigeration machine is opened, the temperature of level-one cryogenic shield is set as≤120k, the temperature of cryogenic liquefying chamber is set
It is set to the triple point of required liquefied gas, accurate temperature controlling cryogenic liquefying chamber temperature reaches the three phase point of frozen gas；
It inflates liquefaction step: closing the second valve, open third valve, the 4th valve, start inflation system, to cryogenic liquefying chamber
It is inside filled with and needs liquefied gas, liquid level is gradually increasing until flooding tests exemplar and full of cryogenic liquefying chamber, closes inflation system
System and the 4th valve, tests exemplar keep set test period in liquefied gas；
End step: opening the first valve, the second valve, third valve, while heating up to cryogenic liquefying chamber, temperature setting
To make liquid gasification greater than gas three phase point and evacuating, after the intracavitary pressure of cryogenic liquefying is lower than normal pressure, third is closed in order
Valve, the second valve, the first valve close vacuum system, and cryogenic liquefying chamber is risen again to after room temperature naturally, to vacuum chamber and deep cooling
It liquefies after intracavitary deflation, with atmospheric pressure balance, removes the upper cover of vacuum chamber, remove the sealing edge of a knife flange on cryogenic liquefying chamber
Lid, finally takes out tests exemplar.
Structure of the invention is simpler, is easy to make, and cooling temperature control works well, and easy to disassemble and replacement is suitable for a variety of
Gas.
Detailed description of the invention
Attached drawing 1 is that the master of submerged gas liquefaction deep cooling experimental provision of the invention cuts open schematic diagram；
Attached drawing 2 is the partial enlargement diagram in attached drawing 1 at A；
Attached drawing 3 is the perspective cross-sectional schematic diagram of submerged gas liquefaction deep cooling experimental provision of the invention.
1, pedestal；2, mounting；3, flange support rod；4, vacuum base flange；5, refrigeration machine；6, vacuum chamber；7, level-one is low
Temperature shielding；8, the first gas circuit；9, cryogenic liquefying chamber；10, tests exemplar；11, heat block；12, temperature sensor；13, sealed knife
Mouth blind flange；14, upper cover；15, the first valve；16, the second valve；17, third valve；18, the 4th valve；19, vacuum system；
20, inflation system；21, temperature controller；22, vacuum cylinder；23, the annular edge of a knife；24, the second gas circuit；25, third gas circuit.
Specific embodiment
The preferred embodiments of the present invention will be described in detail below so that advantages and features of the invention can be easier to by
It will be appreciated by those skilled in the art that so as to make a clearer definition of the protection scope of the present invention.
Referring to attached drawing 1, attached drawing 1 cuts open schematic diagram for the master of submerged gas liquefaction deep cooling experimental provision of the invention, including
Pedestal 1 has mounting 2 above pedestal 1, is vertically arranged with refrigeration machine 5 on mounting 2, the outside of refrigeration machine 5 is provided with vacuum cylinder
Body 22, the inside of vacuum cylinder 22 have vacuum chamber 6, are provided with hollow cryogenic liquefying chamber 9, vacuum on the cold head of refrigeration machine 5
Cylinder 22 is connected and fixed by vacuum base flange 4 with refrigeration machine 5, and the lower section of vacuum base flange 4 is provided with flange support rod
3, flange support rod 3 is supported on pedestal 1.The top of vacuum cylinder 22 is equipped with upper cover 14, and upper cover 14 is closely sealed by bolt
Above vacuum chamber 6.The outside of refrigeration machine 5 is provided with level-one cryogenic shield 7, and cryogenic liquefying chamber 9 is located in level-one cryogenic shield 7
Portion, level-one cryogenic shield 7 are located inside vacuum chamber 6.
Refrigeration machine 5 is G-M refrigeration machine, and G-M refrigeration machine is mainly by compressor set (including helium compressor, low pressure gas storage
Tank, high pressure tank, cooler), expanding machine (including cylinder, pushing piston), valve actuating mechanism (including driving mechanism, intake valve,
Exhaust valve), regenerator and cold header heat exchanger composition.It is connected between the component of compressor set by pipeline, inlet and outlet valve is all located
At room temperature, by its opening and closing of machinery/air pressure drive control, with control by the air-flow of regenerator and expanding machine, circulating pressure and
Volume.Cool storage materials, the hot and cold air such as filling phosphor-copper net, shot periodically alternately pass through it in regenerator, play storage and
Recycle the effect of cooling capacity.The effect of cold header heat exchanger is output cooling capacity.The cylinder and pushing piston of expanding machine by piston ring come
Sealing cooperation, prevents the gas between cold and hot chamber from collaborating.Moving up and down for pushing piston is controlled by small crankshaft, it and into
The control mechanism of exhaust valve is combined, and is driven by a micromotor.The opening and closing and passage of air inlet and exhaust valve are lived
Cooperate between the shift position of plug according to certain phase angle, to guarantee the thermodynamic cycle of refrigeration machine.
G-M refrigeration machine is to realize refrigeration by simon expansion (adiabatic degassing principle), and ideal thermodynamic cycle can be with
It is divided into 4 processes: insulation boosting, isobaric air inlet, adiabatic degassing and isobaric exhaust.Wherein simon expansion generates cooling capacity, cold-storage
Device plays the role of exchanging heat between realization hot and cold air, to obtain alap cryogenic temperature.In another implementation of the invention
In example, separate unit high power refrigeration machine or multiple chillers parallel connection can also be used to improve the heat shielding of refrigeration work consumption and shielding case
Cover ability.
Attached drawing 2 is the partial enlargement diagram in attached drawing 1 at A, and the top of cryogenic liquefying chamber 9 is equipped with sealing edge of a knife flange
Lid 13, sealing edge of a knife blind flange 13 have the annular edge of a knife 23, and the section of the annular edge of a knife 23 is wedge shaped, and the annular edge of a knife 23 passes through screw
With the pre- means of press seals of sealing surface of cryogenic liquefying chamber 9, the percent thermal shrinkage for sealing edge of a knife blind flange 13 is less than the heat receipts of cryogenic liquefying chamber 9
Shrinkage, the sealing surface of cryogenic liquefying chamber 9 are rough surface, and under profound hypothermia state, the wedge-shaped cross section of the annular edge of a knife 23 is with temperature
Reduction is gradually bonded the sealing that closely ensure that the gas and liquid gas that are filled with the sealing surface of cryogenic liquefying chamber 9.
Attached drawing 3 is the perspective cross-sectional schematic diagram of submerged gas liquefaction deep cooling experimental provision of the invention.Cryogenic liquefying chamber 9
On heat block 11 and temperature sensor 12 are installed, heat block 11 and temperature sensor 12 are connected with temperature controller 21 respectively, temperature
Controlling instrument 21 is 4.2k ~ 20k ± 1mk to the control precision of the temperature of cryogenic liquefying chamber 9, and temperature controller 21 is according to 12 institute of temperature sensor
The temperature data control heat block 11 passed back is to accurately control the temperature in cryogenic liquefying chamber 9.
Cryogenic liquefying chamber 9 has the first gas circuit 8, and the first gas circuit 8 is connected with inflation system 20, and vacuum chamber 6 has the second gas
Road 24, the second gas circuit 24 are connected with vacuum system 19, and third gas circuit 25 is provided between the first gas circuit 8 and the second gas circuit 24, the
It is provided with third valve 17 in one gas circuit 8, the first valve 15 is provided in the second gas circuit 24, is provided with second in third gas circuit 25
Valve 16, inflation system 20 are provided with the 4th valve 18.First gas circuit 8 is fixed on cryogenic liquefying chamber 9 by laser welding.
Submerged gas liquefaction deep cooling experimental method of the invention, includes the following steps:
Vacuum step: the placement tests exemplar 10 in cryogenic liquefying chamber 9, starting vacuum system 19, and the first valve 15 of opening,
Second valve 16, third valve 17 close the 4th valve 18, vacuumize, vacuumize simultaneously to vacuum chamber 6 and cryogenic liquefying chamber 9
Time >=6 hour；
Gas displacement step: when vacuum degree reaches 5 × 10-4After Pa, the second valve 16 is closed, opens the 4th valve 18, starting is filled
Gas system 20 is filled with into cryogenic liquefying chamber 9 and needs liquefied gas, to normal pressure after close inflation system 20, close the 4th valve
Door 18 opens third valve 17, and the gas being filled with is extracted out, and vacuum degree reaches 5 × 10-4After Pa, it is repeated two more times identical inflation
Replacement process guarantees free from admixture gas in cryogenic liquefying chamber 9；
Cooling step: refrigeration machine 5 is opened, the temperature of level-one cryogenic shield 7 is set as≤120k, by the temperature of cryogenic liquefying chamber 9
Degree is set as the triple point of required liquefied gas, and 9 temperature of accurate temperature controlling cryogenic liquefying chamber reaches the three phase point of frozen gas；
It inflates liquefaction step: closing the second valve 16, open third valve 17, the 4th valve 18, start inflation system 20, Xiang Shen
It is filled in cold liquefaction chamber 9 and needs liquefied gas, the gas liquefaction after saturated vapour pressure and temperature of gas meet liquefaction condition,
Constantly injecting and liquefying with gas, liquid level are gradually increasing until flooding tests exemplar 10 and full of cryogenic liquefying chamber 9, close
Inflation system 20 and the 4th valve 18, tests exemplar 10 keep set test period in liquefied gas；
End step: opening the first valve 15, the second valve 16, third valve 17, while heating up to cryogenic liquefying chamber 9,
Temperature is set greater than gas three phase point and makes liquid gasification and evacuate, and the gas of liquid is unsatisfactory for required liquid due to saturated vapour pressure
Change condition, liquid gas will gradually gasify and be extracted out by vacuum system, until all gasification evacuates liquid gas, cryogenic liquefying chamber
Pressure in 9 closes third valve 17, the second valve 16, the first valve 15 in order, closes vacuum system lower than after normal pressure
19, cryogenic liquefying chamber 9 is risen again to after room temperature naturally, to deflating in vacuum chamber 6 and cryogenic liquefying chamber 9, after atmospheric pressure balance,
The upper cover 14 for removing vacuum chamber 6 removes the sealing edge of a knife blind flange 13 on cryogenic liquefying chamber 9, finally takes out tests exemplar 10.
The technical concepts and features of embodiment of above only to illustrate the invention, its object is to allow be familiar with technique
People understands the contents of the present invention and is implemented, and it is not intended to limit the scope of the present invention, all spiritual according to the present invention
The equivalent change or modification that essence is done is allincluded in the scope of the present invention.
Claims (10)
1. a kind of submerged gas liquefaction deep cooling experimental provision, it is characterised in that: including pedestal (1), the pedestal (1) top
It with mounting (2), is vertically arranged on the mounting (2) refrigeration machine (5), the outside of the refrigeration machine (5) is provided with
The inside of vacuum cylinder (22), the vacuum cylinder (22) has vacuum chamber (6), sets on the cold head of the refrigeration machine (5)
It is equipped with hollow cryogenic liquefying chamber (9), sealing edge of a knife blind flange (13), institute are installed above the cryogenic liquefying chamber (9)
The sealing edge of a knife blind flange (13) stated has the annular edge of a knife (23), and the section of the annular edge of a knife (23) is wedge shaped, described
The annular edge of a knife (23) passes through the pre- means of press seals of sealing surface of screw and cryogenic liquefying chamber (9), the sealing edge of a knife blind flange (13)
Percent thermal shrinkage be less than the percent thermal shrinkage of cryogenic liquefying chamber (9) so that the wedge-shaped cross section of the annular edge of a knife (23) is reduced with temperature
It is gradually bonded closely with the sealing surface of cryogenic liquefying chamber (9)；Wherein,
Heat block (11) and temperature sensor (12) be installed on the cryogenic liquefying chamber (9), the heat block (11) and
Temperature sensor (12) is connected with temperature controller (21) respectively, and the temperature controller (21) is according to the temperature sensor (12)
The temperature data control passed back the heat block (11) is to accurately control the temperature in cryogenic liquefying chamber (9)；
The cryogenic liquefying chamber (9) has the first gas circuit (8), and first gas circuit (8) is connected with inflation system (20), institute
The vacuum chamber (6) stated has the second gas circuit (24), and second gas circuit (24) is connected with vacuum system (19), and described first
It is provided between gas circuit (8) and the second gas circuit (24) third gas circuit (25), is provided with third valve in first gas circuit (8)
(17), it is provided with the first valve (15) in second gas circuit (24), is provided with the second valve in the third gas circuit (25)
Door (16), the inflation system (20) are provided with the 4th valve (18).
2. submerged gas liquefaction deep cooling experimental provision according to claim 1, it is characterised in that: the vacuum cylinder
(22) it is connected and fixed by vacuum base flange (4) with refrigeration machine (5).
3. submerged gas liquefaction deep cooling experimental provision according to claim 2, it is characterised in that: the vacuum base
It is provided with below flange (4) flange support rod (3), the flange support rod (3) is supported on the pedestal (1).
4. submerged gas liquefaction deep cooling experimental provision according to claim 1, it is characterised in that: the refrigeration machine
It (5) is G-M refrigeration machine.
5. submerged gas liquefaction deep cooling experimental provision according to claim 1, it is characterised in that: the vacuum cylinder
(22) it is equipped at the top of upper cover (14), the upper cover (14) is closely enclosed in above vacuum chamber (6) by bolt.
6. submerged gas liquefaction deep cooling experimental provision according to claim 1, it is characterised in that: the temperature controller
It (21) is 4.2k ~ 20k ± 1mk to the control precision of the temperature of cryogenic liquefying chamber (9).
7. submerged gas liquefaction deep cooling experimental provision according to claim 1, it is characterised in that: first gas circuit
(8) it is fixed on cryogenic liquefying chamber (9) by laser welding.
8. submerged gas liquefaction deep cooling experimental provision according to claim 1, it is characterised in that: the refrigeration machine
(5) outside is provided with level-one cryogenic shield (7), and the cryogenic liquefying chamber (9) is located in the level-one cryogenic shield (7)
Portion, it is internal that the level-one cryogenic shield (7) is located at the vacuum chamber (6).
9. submerged gas liquefaction deep cooling experimental provision according to claim 1, it is characterised in that: the cryogenic liquefying
The sealing surface of chamber (9) is rough surface.
10. a kind of submerged gas liquefaction deep cooling experimental method, for the submerged gas liquefaction as described in claim 1 to 9
Deep cooling experimental provision, characterized by the following steps:
Vacuum step: placing tests exemplar (10) in cryogenic liquefying chamber (9), starts vacuum system (19), and opens first
Valve (15), the second valve (16), third valve (17) close the 4th valve (18), to vacuum chamber (6) and cryogenic liquefying chamber
(9) it vacuumizes simultaneously, pumpdown time >=6 hour；
Gas displacement step: when vacuum degree reaches 5 × 10-4It after Pa, closes the second valve (16), opens the 4th valve (18), open
Dynamic inflation system (20) are filled with into cryogenic liquefying chamber (9) and need liquefied gas, to normal pressure after close inflation system (20),
The 4th valve (18) is closed, is opened third valve (17), the gas being filled with is extracted out, vacuum degree reaches 5 × 10-4After Pa, then weigh
Multiple inflation replacement process identical twice, guarantees cryogenic liquefying chamber (9) interior free from admixture gas；
Cooling step: it opens refrigeration machine (5), the temperature of level-one cryogenic shield (7) is set as≤120k, by cryogenic liquefying chamber
(9) temperature is set as the triple point of required liquefied gas, and accurate temperature controlling cryogenic liquefying chamber (9) temperature reaches frozen gas
Three phase point；
It inflates liquefaction step: closing the second valve (16), open third valve (17), the 4th valve (18), start inflation system
(20), it is filled with into cryogenic liquefying chamber (9) and needs liquefied gas, liquid level is gradually increasing until flooding tests exemplar (10) and filling
Full cryogenic liquefying chamber (9), close inflation system (20) and the 4th valve (18), tests exemplar (10) keep institute in liquefied gas
The test period of setting；
End step: open the first valve (15), the second valve (16), third valve (17), while to cryogenic liquefying chamber (9) into
Row heating, temperature are set greater than gas three phase point and make liquid gasification and evacuate, and the pressure in cryogenic liquefying chamber (9) is lower than normal pressure
Afterwards, third valve (17), the second valve (16), the first valve (15) are closed in order, are closed vacuum system (19), cryogenic liquefying
Chamber (9) is risen again to after room temperature naturally, to deflating in vacuum chamber (6) and cryogenic liquefying chamber (9), after atmospheric pressure balance, is removed
The upper cover (14) of vacuum chamber (6) removes the sealing edge of a knife blind flange (13) on cryogenic liquefying chamber (9), finally by tests exemplar
(10) it takes out.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556231A (en) * | 2020-12-08 | 2021-03-26 | 河南工学院 | Temperature fluctuation suppression device |
| CN112944777A (en) * | 2019-12-10 | 2021-06-11 | 苏州阿奎睿思机器人科技有限公司 | Low-temperature environment preparation device |
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