CN111220447A - Preparation system for low-boiling-point sample light gas gun loading test and use method - Google Patents
Preparation system for low-boiling-point sample light gas gun loading test and use method Download PDFInfo
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- CN111220447A CN111220447A CN202010154697.3A CN202010154697A CN111220447A CN 111220447 A CN111220447 A CN 111220447A CN 202010154697 A CN202010154697 A CN 202010154697A CN 111220447 A CN111220447 A CN 111220447A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/42—Nitrogen or special cases, e.g. multiple or low purity N2
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Abstract
The invention relates to the technical field of impact compression, in particular to a preparation system and a use method of a low-boiling-point light gas gun loading test sample, which comprises a target device, a cooling mechanism and a sample preparation mechanism, wherein the target device comprises a sample chamber and a cooling chamber, the sample chamber is arranged in the cooling chamber, or the cooling chamber is arranged around the sample chamber, a sensor unit is arranged on the side wall of the sample chamber and used for detecting the temperature and the pressure in the sample chamber, and the cooling mechanism comprises a cooling liquid tank, a cooling liquid inlet pipe and a cooling liquid outlet pipe; the sample preparation mechanism comprises a sample gas storage tank, a sample injection pipe, a vacuum pump and a connecting pipe. The invention can reduce the sample temperature in the sample chamber of the target device to below zero and above hundred ℃ in a very short time according to the temperature requirement of an experiment, realizes the rapid preparation of pure and stable samples such as liquid nitrogen, liquid hydrogen and the like in a short time, and has important significance for promoting the high-pressure research of low-boiling-point samples such as liquid nitrogen, liquid hydrogen and the like.
Description
Technical Field
The invention relates to the technical field of impact compression, in particular to a preparation system and a use method of a low-boiling-point light gas gun loading test sample.
Background
High-voltage science and technology are emerging subjects in an accelerated development stage. Most of the condensed substances in the universe are under high pressure. Under the extreme condition of ultrahigh pressure, the atom/molecule distance in condensed substances is shortened, the interaction is obviously enhanced, electrons in the inner layer of atoms can participate in bonding, the original structure can be damaged, the structural phase change, the physical property change (the electromagnetic interaction state is changed) and the strong interaction between nuclei (nuclear reaction) are caused, and new materials are synthesized, even new physical phenomena appear. Therefore, the behavior research of substances under extreme conditions such as ultrahigh pressure is regarded as the research field which is most likely to make major scientific breakthrough in the future, and the method can be widely applied to the fields of national defense, new energy, new materials, geoscience, planetary science, chemistry, condensed state physics, biomedicine and the like. The most classical example of the application in the field of materials is the high-temperature and high-pressure synthesis of superhard materials such as artificial diamond and cubic boron nitride.
The liquid nitrogen has wide application, is usually obtained by a method of fractionating compressed liquid air in industrial production, can be used as a deep refrigerant, can be directly contacted with biological tissues due to chemical inertia, can be immediately frozen without destroying biological activity, and can be used for quickly freezing and transporting food or making ice products; performing low-temperature physics research; the low temperature state is demonstrated in scientific education. An object which is soft at normal temperature is soaked in liquid nitrogen and becomes brittle like glass; the energy of the double-component low-temperature liquid propellant consisting of liquid hydrogen and liquid oxygen is extremely high, and the double-component low-temperature liquid propellant is widely used for launching carrier rockets such as communication satellites, spacecrafts, space shuttles and the like. Liquid hydrogen can also form a high-energy propellant with liquid fluorine. In addition, the liquid hydrogen can also be used as fuel of new energy automobiles, and the elasticity and thermodynamic properties of nitrogen under the condition of the positive electrode end have very important significance in scientific fields of physics, chemistry, geophysical, celestial physics, material physics and the like. At present, high-pressure research on liquid nitrogen and liquid hydrogen is a very hot topic at home and abroad, and for the field of dynamic high pressure, how to prepare pure and stable liquid nitrogen and liquid hydrogen in a target is a difficult problem, and the existing technical literature is rarely involved.
Therefore, the preparation system and the use method for preparing the high-purity low-boiling-point sample based on the light gas gun are simple in structure and convenient and fast to use, the samples such as liquid nitrogen and liquid hydrogen can be quickly and effectively prepared in the target, and other samples obtained by low-temperature liquefaction of gas can be prepared for carrying out the loading test of the light gas gun.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation system and a use method of a low-boiling-point light gas gun loading test sample, which can reduce the sample temperature in a sample chamber of a target device to below zero and above hundred ℃ in a very short time according to the temperature requirement of an experiment, and simultaneously, the main body structure of the target device is made of a metal material, so that the deformation of the target device can be controlled at the low temperature of a liquid nitrogen environment and under the impact pressure of several megapascals, the sealing property and the stability of the target device in the low-temperature experiment process are ensured, pure and stable samples such as liquid nitrogen and liquid hydrogen are quickly prepared in a short time, and the preparation system and the use method have important significance for promoting high-pressure research of low-boiling-point samples such as liquid nitrogen and liquid hydrogen.
The purpose of the invention is realized by the following technical scheme:
a preparation system of a low-boiling-point light gas gun loading test sample comprises a target device, a cooling mechanism and a sample preparation mechanism, wherein the target device comprises a sample chamber and a cooling chamber, the sample chamber is arranged in the cooling chamber or the cooling chamber is arranged around the sample chamber, a sensor unit is arranged on the side wall of the sample chamber and used for detecting the temperature and the pressure in the sample chamber, the cooling mechanism comprises a cooling liquid tank, a cooling liquid inlet pipe and a cooling liquid outlet pipe, the cooling liquid outlet pipe is communicated with the cooling chamber, one end of the cooling liquid inlet pipe is communicated with the cooling liquid tank, and the other end of the cooling liquid inlet pipe is communicated with the cooling chamber; the system appearance mechanism includes sample gas holder, notes appearance pipe, vacuum pump and connecting pipe, the one end and the sample gas holder intercommunication of notes appearance pipe, the other end of notes appearance pipe passes through connecting pipe and sample room intercommunication, the vacuum pump passes through the middle part intercommunication of vacuum tube with notes appearance pipe, still is provided with first control valve on the notes appearance pipe, and the link setting of vacuum tube and notes appearance pipe is between connecting pipe and first control valve.
Further, system appearance mechanism still includes atmospheric pressure detecting element, atmospheric pressure detecting element sets up on annotating the appearance pipe, and atmospheric pressure detecting element sets up between first control valve and sample gas holder. Through set up atmospheric pressure detecting element on annotating the appearance pipe to set up atmospheric pressure detecting element between first control valve and sample gas holder, at the in-process of annotating appearance liquefaction, the user can observe annotating the appearance state through atmospheric pressure detecting element, if the pressure data that atmospheric pressure detecting element detected lasts the increase, can close first control valve, then whether the pressure data that looks atmospheric pressure detecting element detected changes, if do not change, then indicate to annotate the appearance and accomplish.
Further, the air pressure detection unit is an air pressure meter.
Furthermore, the material of notes appearance pipe is copper.
Furthermore, a second control valve is arranged at the connecting end of the sample injection pipe and the vacuum pipe, and the second control valve is arranged on the sample injection pipe or the vacuum pipe. In the process of vacuumizing the sample chamber, the first control valve is closed, the second control valve is opened, the vacuum pump sequentially passes through the vacuum tube, the sample injection tube and the connecting tube and is communicated with the sample chamber, then the vacuum pump works to vacuumize the sample chamber, the connecting tube and part of the sample injection tube, after the vacuum degree in the sample chamber reaches a preset value, the second control valve and the vacuum pump can be closed, the first control valve is opened, the sample gas storage tank sequentially passes through the sample injection tube and the connecting tube and is communicated with the sample chamber, as compressed gas is filled in the sample gas storage tank, the sample chamber is in a vacuum state, under the action of pressure difference, a gas sample in the sample gas storage tank can rapidly enter the sample chamber to be liquefied in a short time, the sample chamber can be rapidly filled with a pure liquid sample in a short time, and a light gas gun loading test.
Further, a third control valve is arranged on the cooling liquid inlet pipe. In the process of cooling the sample chamber, the first control valve and the second control valve are closed, then the third control valve is opened, liquid nitrogen in the cooling liquid tank enters the cooling chamber through the cooling liquid inlet pipe and is vaporized in the cooling chamber to take heat away, the temperature of the sample chamber is rapidly reduced in a short time, the temperature of the sample chamber can be rapidly reduced to minus hundred ℃ and the rapid cooling of the sample chamber is realized; and the vaporized nitrogen is discharged and collected through a cooling liquid outlet pipe.
Further, the connecting pipe is a copper hose.
Further, the sensor unit includes a temperature sensor and a pressure sensor. In the process of cooling or injecting the sample into the sample chamber, the temperature and the pressure of the sample chamber can be detected through the sensor unit, whether the gaseous sample in the sample chamber can be continuously maintained to be liquefied or not is checked, if the temperature in the sample chamber is too high, the amount of the liquid nitrogen introduced into the cooling chamber can be increased, the temperature of the cooling chamber and the temperature of the sample chamber are further reduced, if the temperature in the sample chamber is too low, the amount of the liquid nitrogen introduced into the cooling chamber can be properly reduced, and the temperature of the sample chamber is further adjusted.
Further, the target device is made of metal. The target device is made of metal, so that the deformation of the target device is still controllable even at low temperature of a liquid nitrogen environment and under impact pressure of several megapascals, and the sealing performance and the stability of the target device in the low-temperature experiment process are guaranteed.
Furthermore, the target device, the cooling liquid inlet pipe and the cooling liquid outlet pipe are respectively coated with heat insulating layers. Through at target device, cooling feed liquor pipe and cooling drain pipe cladding respectively the heat insulation layer, avoid the heat transfer in the environment to the coolant liquid, reduce the energy loss that the coolant liquid is the transportation in-process to let the heat of coolant liquid maximum efficiency take away the sample room, realize the rapid cooling of sample room.
The use method of the preparation system comprises the following steps:
step S100: before a light gas gun loading test is carried out on a low-boiling-point sample, closing the first control valve and the second control valve, opening a third control valve on the cooling liquid inlet pipe, introducing liquid nitrogen into the cooling chamber, and cooling the sample chamber to the liquefaction temperature of the sample;
step S200: adjusting or closing the third control valve, opening the second control valve, and starting a vacuum pump to vacuumize the sample chamber;
step S300: after the sample chamber is vacuumized, the vacuum pump is closed, the second control valve is closed, the first control valve is opened, and under the action of pressure difference, the gas sample in the sample gas storage tank enters the sample chamber and is liquefied to form a pure liquid sample;
step S400: and after the sample is liquefied in the sample chamber, carrying out a light gas gun loading test.
Furthermore, in the process of injecting the sample into the sample chamber, the air pressure detection unit is used for observing the sample injection state, if the pressure data detected by the air pressure detection unit continuously increases, the first control valve can be closed, then whether the pressure data detected by the air pressure detection unit changes or not is judged, and if the pressure data detected by the air pressure detection unit does not change, the sample injection is finished.
Further, the temperature of the sample chamber is adjusted by controlling the amount of liquid nitrogen introduced into the cooling chamber during the cooling or sample injection process of the sample chamber. Specifically, detect the temperature and the pressure of sample room through the sensor unit, look over whether can continuously maintain the liquefaction of gaseous state sample in the sample room, if the interior temperature of sample room is too high, then can increase the volume that the liquid nitrogen lets in the cooling chamber, further reduce the temperature of cooling chamber and sample room, if the interior temperature of sample room is low, then can suitably reduce the volume that the liquid nitrogen lets in the cooling chamber, and then adjust the temperature of sample room.
Further, in the process of injecting the sample, liquid nitrogen is continuously introduced into the cooling chamber, and the low-temperature environment of the sample chamber is maintained. In the sample injection process, the liquid nitrogen in the cooling liquid tank enters the cooling chamber through the cooling liquid inlet pipe by opening the third control valve, is vaporized in the cooling chamber, takes away heat, rapidly cools the sample chamber in a short time, can rapidly cool the sample chamber to minus and over hundred ℃, and achieves rapid cooling of the sample chamber; and the vaporized nitrogen is discharged and collected through a cooling liquid outlet pipe.
Further, the sample gas storage tank stores nitrogen or hydrogen.
After the technical scheme is adopted, the invention has the beneficial effects that:
according to the preparation system and the use method of the low-boiling-point light gas gun loading test sample, the temperature of the sample in the sample chamber of the target device can be reduced to zero or hundreds of degrees in a very short time according to the temperature requirement of an experiment, and meanwhile, the main body structure of the target device is made of a metal material, so that the deformation of the target device can be controlled at a low temperature of a liquid nitrogen environment and under the impact pressure of several megapascals, the sealing property and the stability of the target device in the low-temperature experiment process are ensured, the pure and stable samples such as liquid nitrogen, liquid hydrogen and the like can be quickly prepared in a short time, and the preparation system and the use method have important significance for promoting high-pressure research of the low-boiling-point samples such.
Drawings
FIG. 1 is a schematic view of a manufacturing system according to the present invention;
FIG. 2 is a schematic view of a manufacturing system in a sectional view of a target device according to the present invention;
FIG. 3 is a cross-sectional view of a sample injection tube of the present invention;
FIG. 4 is a diagram showing the state of the preparation system of the present invention in the sample chamber when liquid nitrogen is prepared;
in the figure, 1-target device, 101-sample chamber, 102-cooling chamber, 103-sensor unit, 2-cooling mechanism, 201-cooling liquid tank, 202-cooling liquid inlet pipe, 203-cooling liquid outlet pipe, 204-third control valve, 3-sample preparation mechanism, 301-sample storage tank, 302-sample injection pipe, 303-vacuum pump, 304-connecting pipe, 305-first control valve, 306-air pressure detection unit, 307-vacuum pipe, 308-second control valve.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1 to 3, a preparation system for a low-boiling point light gas gun loading test sample comprises a target device 1, a cooling mechanism 2 and a sample preparation mechanism 3, wherein the target device 1 comprises a sample chamber 101 and a cooling chamber 102, the sample chamber 101 is arranged in the cooling chamber 102, or the cooling chamber 102 is arranged around the sample chamber 101, a sensor unit 103 is arranged on the side wall of the sample chamber 101, the sensor unit 103 is used for detecting the temperature and pressure in the sample chamber 101, the cooling mechanism 2 comprises a cooling liquid tank 201, a cooling liquid inlet pipe 202 and a cooling liquid outlet pipe 203, the cooling liquid outlet pipe 203 is communicated with the cooling chamber 102, one end of the cooling liquid inlet pipe 202 is communicated with the cooling liquid tank 201, and the other end of the cooling liquid inlet pipe 202 is communicated with the cooling chamber 102; the sample preparation mechanism 3 comprises a sample gas storage tank 301, a sample injection pipe 302, a vacuum pump 303 and a connecting pipe 304, one end of the sample injection pipe 302 is communicated with the sample gas storage tank 301, the other end of the sample injection pipe 302 is communicated with the sample chamber 101 through the connecting pipe 304, the vacuum pump 303 is communicated with the middle of the sample injection pipe 302 through a vacuum pipe 307, the sample injection pipe 302 is further provided with a first control valve 305, and the connecting end of the vacuum pipe 307 and the sample injection pipe 302 is arranged between the connecting pipe 304 and the first control valve 305.
Specifically, the sample preparation mechanism 3 further includes an air pressure detection unit 306, the air pressure detection unit 306 is disposed on the sample injection tube 302, and specifically, the air pressure detection unit 306 is disposed between the first control valve 305 and the sample gas holder 301. By providing the air pressure detection unit 306 on the sample injection tube 302 and providing the air pressure detection unit 306 between the first control valve 305 and the sample storage tank 301, during the liquefaction of the sample injection, a user can estimate the sample injection state by the air pressure detection unit 306, if the pressure data detected by the air pressure detection unit 306 continuously increases, the first control valve 305 can be closed, and then whether the pressure data detected by the air pressure detection unit 306 changes or not is checked, and if the pressure data does not change, the completion of the sample injection is indicated.
Specifically, the air pressure detecting unit 306 is an air pressure gauge.
Specifically, the sample injection pipe 302 is made of copper. Specifically, the cooling liquid tank 201 is a liquid nitrogen tank.
Specifically, the connection end of the sample injection tube 302 and the vacuum tube 304 is further provided with a second control valve 308, and the second control valve 308 is arranged on the sample injection tube 302 or the vacuum tube 304. In the process of vacuumizing the sample chamber 101, the first control valve 305 is closed, the second control valve 308 is opened, the vacuum pump 303 is communicated with the sample chamber 101 through the vacuum pipe 307, the sample injection pipe 302 and the connecting pipe 304 in sequence, then the vacuum pump 303 works to vacuumize the sample chamber 101, the connecting pipe 304 and part of the sample injection pipe 302, after the vacuum degree in the sample chamber 101 reaches a preset value, the second control valve 308 and the vacuum pump 303 can be closed, the first control valve 305 is opened, the sample gas storage tank 301 is communicated with the sample chamber 101 through the sample injection pipe 302 and the connecting pipe 304 in sequence, as the sample gas storage tank 301 is compressed gas and the sample chamber 101 is in a vacuum state, under the action of pressure difference, the gas sample in the sample gas storage tank 301 can rapidly enter the sample chamber 101 in a short time and be cooled and liquefied, so that the sample chamber 101 is rapidly filled with pure liquid samples in a short time, light gas gun loading tests on liquid samples are facilitated.
Specifically, a third control valve 204 is disposed on the cooling liquid inlet pipe 202. In the process of cooling the sample chamber 101, the first control valve 305 and the second control valve 308 are closed, then the third control valve 204 is opened, liquid nitrogen in the cooling liquid tank 201 enters the cooling chamber 102 through the cooling liquid inlet pipe 202 and is vaporized in the cooling chamber 102 to take heat away, the temperature of the sample chamber 101 is rapidly reduced in a short time, the temperature of the sample chamber 101 can be rapidly reduced to minus hundred ℃ and hundreds of ℃, and the rapid cooling of the sample chamber 101 is realized; and the vaporized nitrogen is discharged through cooling outlet pipe 203 and collected. Preferably, the third control valve 204 is a control valve with a flow rate statistic function.
Specifically, the connection pipe 304 is a copper hose.
Specifically, the sensor unit 103 includes a temperature sensor and a pressure sensor. In the process of cooling or injecting the sample into the sample chamber 101, the temperature and the pressure of the sample chamber 101 can be detected through the sensor unit 103, whether the temperature in the sample chamber 101 can continuously maintain the liquefaction of the gaseous sample in the sample chamber 101 is checked, if the temperature in the sample chamber 101 is too high, the amount of liquid nitrogen introduced into the cooling chamber 102 can be increased, the temperatures of the cooling chamber 102 and the sample chamber 101 are further reduced, and if the temperature in the sample chamber 101 is too low, the amount of liquid nitrogen introduced into the cooling chamber 102 can be properly reduced, so that the temperature of the sample chamber 101 is adjusted.
Specifically, the target device 1 is made of a metal material. By setting the target device 1 to be made of metal, the deformation of the target device 1 is guaranteed to be controllable even under the low temperature of a liquid nitrogen environment and the impact pressure of several megapascals, and the sealing performance and the stability of the target device 1 in the low-temperature experiment process are guaranteed.
Specifically, the target device 1, the cooling liquid inlet pipe 202, and the cooling liquid outlet pipe 203 are respectively coated with heat insulating layers. Through having the heat insulation layer respectively in target device 1, cooling feed liquor pipe 202 and cooling drain pipe 203 cladding, avoid the heat transfer in the environment to the coolant liquid, reduce the energy loss that the coolant liquid is the transportation in-process to let the coolant liquid maximum efficiency take away the heat of sample room 101, realize the rapid cooling of sample room 101.
The specific method for preparing the low-boiling-point sample for the light gas gun loading test by using the preparation system comprises the following steps: before a light gas gun loading test is carried out on a low-boiling-point sample, liquid nitrogen is introduced into a cooling chamber 102, the temperature of a sample chamber 101 is reduced to the liquefaction temperature of the sample, then a first control valve 305 is closed, and a vacuum pump 303 is started to carry out vacuum pumping treatment on the sample chamber 101; after the vacuum pumping is finished, the vacuum pump 303 is closed, the first control valve 305 is opened, the gas sample in the sample gas storage tank 301 enters the sample chamber 101 under the action of the pressure difference, the gas sample is liquefied to form a pure liquid sample, and then the light gas gun loading test can be carried out.
The use method for preparing the low-boiling-point sample for the light gas gun loading test by using the preparation system specifically comprises the following steps:
step S100: before a light gas gun loading test is carried out on a low-boiling-point sample, closing a first control valve 305 and a second control valve 308, opening a third control valve 204 on a cooling liquid inlet pipe, introducing liquid nitrogen into a cooling chamber 102, and cooling a sample chamber 101 to the liquefaction temperature of the sample;
step S200: adjusting or closing the third control valve 204, opening the second control valve 308, and starting the vacuum pump 303 to vacuumize the sample chamber 101;
step S300: after the sample chamber 101 is vacuumized, the vacuum pump 303 is closed, the second control valve 308 is closed, the first control valve 305 is opened, and under the action of pressure difference, the gas sample in the sample gas storage tank 301 enters the sample chamber 101 and is liquefied to form a pure liquid sample;
step S400: after the sample is liquefied in the sample chamber 101, a light gas gun loading test is performed.
Specifically, during the process of injecting the sample into the sample chamber 101, the air pressure detecting unit 306 is used to observe the injection state, if the pressure data detected by the air pressure detecting unit 306 continuously increases, the first control valve 305 may be closed, and then whether the pressure data detected by the air pressure detecting unit 306 changes or not is observed, and if the pressure data does not change, the injection is completed.
Specifically, during cooling or sample injection of sample chamber 101, the temperature of sample chamber 101 is regulated by controlling the amount of liquid nitrogen introduced into cooling chamber 102. Specifically, the temperature and the pressure of the sample chamber 101 are detected by the sensor unit 103, whether the temperature in the sample chamber 101 can continuously maintain the liquefaction of the gaseous sample in the sample chamber 101 is checked, if the temperature in the sample chamber 101 is too high, the amount of the liquid nitrogen introduced into the cooling chamber 102 can be increased, the temperatures of the cooling chamber 102 and the sample chamber 101 can be further reduced, and if the temperature in the sample chamber 101 is too low, the amount of the liquid nitrogen introduced into the cooling chamber 102 can be appropriately reduced, so that the temperature of the sample chamber 101 can be adjusted.
Specifically, during the sample injection, liquid nitrogen is continuously introduced into the cooling chamber 102 to maintain the low-temperature environment of the sample chamber 101. In the process of injecting the sample, the liquid nitrogen in the cooling liquid tank 201 enters the cooling chamber 102 through the cooling liquid inlet pipe 202 by opening the third control valve 204, is vaporized in the cooling chamber 102, takes heat away, rapidly cools the sample chamber 101 in a short time, rapidly cools the sample chamber 101 to minus hundred ℃ and realizes rapid cooling of the sample chamber 101; and the vaporized nitrogen is discharged through cooling outlet pipe 203 and collected. Preferably, the flow rate of the coolant is adjusted by adjusting the opening degree of the third control valve 204.
Specifically, the sample gas holder 301 stores therein nitrogen or hydrogen.
In a specific embodiment, pure liquid nitrogen is selected as a sample for a light gas gun loading test, before the light gas gun loading test is performed on the pure liquid nitrogen sample, the first control valve 305 and the second control valve 308 are closed, then the third control valve 204 is opened, liquid nitrogen in the cooling liquid tank 201 enters the cooling chamber 102 through the cooling liquid inlet pipe 202, is vaporized in the cooling chamber 102, carries heat away, rapidly cools the sample chamber 101 in a short time, and can rapidly cool the sample chamber 101 to the liquefaction temperature of nitrogen; then the second control valve 308 is opened, the vacuum pump 303 passes through the vacuum tube 307, the sample injection tube 302 and the connecting tube 304 in sequence and is communicated with the sample chamber 101, then, the vacuum pump 303 is started to work, so that the sample chamber 101, the connecting pipe 304 and part of the sample injection pipe 302 can be vacuumized, after the vacuum degree in the sample chamber 101 reaches a preset value, the second control valve 308 and the vacuum pump 303 can be closed, the first control valve 305 can be opened, the sample gas holder 301 is communicated with the sample chamber 101 through the sample injection pipe 302 and the connecting pipe 304 in sequence, because the compressed nitrogen is in the sample gas storage tank 301, and the sample chamber 101 is in a vacuum state, under the action of pressure difference, nitrogen in the sample gas storage tank 301 can quickly enter the sample chamber 101 in a short time and is condensed and liquefied, as shown in fig. 4, the sample chamber 101 is quickly filled with pure nitrogen liquid in a short time, and then the first control valve 305 is closed to perform a light gas gun loading test study on the liquid nitrogen sample.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A preparation system of a low-boiling-point light gas gun loading test sample comprises a target device, a cooling mechanism and a sample preparation mechanism, and is characterized in that the target device comprises a sample chamber and a cooling chamber, the sample chamber is arranged in the cooling chamber, or the cooling chamber is arranged around the sample chamber, a sensor unit is arranged on the side wall of the sample chamber, the sensor unit is used for detecting the temperature and the pressure in the sample chamber, the cooling mechanism comprises a cooling liquid tank, a cooling liquid inlet pipe and a cooling liquid outlet pipe, the cooling liquid outlet pipe is communicated with the cooling chamber, one end of the cooling liquid inlet pipe is communicated with the cooling liquid tank, and the other end of the cooling liquid inlet pipe is communicated with the cooling chamber; the system appearance mechanism includes sample gas holder, notes appearance pipe, vacuum pump and connecting pipe, the one end and the sample gas holder intercommunication of notes appearance pipe, the other end of notes appearance pipe passes through connecting pipe and sample room intercommunication, the vacuum pump passes through the middle part intercommunication of vacuum tube with notes appearance pipe, still is provided with first control valve on the notes appearance pipe, and the link setting of vacuum tube and notes appearance pipe is between connecting pipe and first control valve.
2. The system for preparing the low-boiling-point light gas gun loading test sample according to claim 1, wherein a second control valve is further arranged at the connecting end of the sample injection pipe and the vacuum pipe, and the second control valve is arranged on the sample injection pipe or the vacuum pipe.
3. The system for preparing the low-boiling-point light gas gun loading test sample according to claim 2, wherein a third control valve is arranged on the cooling liquid inlet pipe.
4. The system for preparing the low boiling point light gas gun loading test sample according to claim 3, wherein the sample preparation mechanism further comprises an air pressure detection unit, the air pressure detection unit is arranged on the sample injection tube, and the air pressure detection unit is arranged between the first control valve and the sample gas storage tank.
5. The system for preparing a light gas cannon loading test sample according to claim 4, wherein the air pressure detection unit is an air pressure gauge.
6. The system for preparing the low-boiling-point light gas gun loading test sample according to claim 3, wherein the connecting pipe is a copper hose.
7. The system for preparing a low boiling point light gas gun loading test sample according to claim 3, wherein the sensor unit comprises a temperature sensor and a pressure sensor.
8. The system for preparing a low boiling point light gas gun loading test sample according to claim 3, wherein the target device is made of metal.
9. The system for preparing a low-boiling-point light gas gun loading test sample according to claim 3, wherein the target device, the cooling liquid inlet pipe and the cooling liquid outlet pipe are respectively coated with heat insulating layers.
10. A method of using the preparation system according to any one of claims 3 to 9, comprising the steps of:
step S100: before a light gas gun loading test is carried out on a low-boiling-point sample, closing the first control valve and the second control valve, opening a third control valve on the cooling liquid inlet pipe, introducing liquid nitrogen into the cooling chamber, and cooling the sample chamber to the liquefaction temperature of the sample;
step S200: adjusting or closing the third control valve, opening the second control valve, and starting a vacuum pump to vacuumize the sample chamber;
step S300: after the sample chamber is vacuumized, the vacuum pump is closed, the second control valve is closed, the first control valve is opened, and under the action of pressure difference, the gas sample in the sample gas storage tank enters the sample chamber and is liquefied to form a pure liquid sample;
step S400: and after the sample is liquefied in the sample chamber, carrying out a light gas gun loading test.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115877791A (en) * | 2023-02-08 | 2023-03-31 | 北京理工大学 | Self-cleaning control system and self-cleaning control method for light gas gun target chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115877791A (en) * | 2023-02-08 | 2023-03-31 | 北京理工大学 | Self-cleaning control system and self-cleaning control method for light gas gun target chamber |
| CN115877791B (en) * | 2023-02-08 | 2023-05-16 | 北京理工大学 | Self-cleaning control system and self-cleaning control method for light gas gun target chamber |
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