CN109374090A - A kind of level monitoring system based on ultrasound - Google Patents
A kind of level monitoring system based on ultrasound Download PDFInfo
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- CN109374090A CN109374090A CN201811236457.7A CN201811236457A CN109374090A CN 109374090 A CN109374090 A CN 109374090A CN 201811236457 A CN201811236457 A CN 201811236457A CN 109374090 A CN109374090 A CN 109374090A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 238000002604 ultrasonography Methods 0.000 title claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 382
- 239000007788 liquid Substances 0.000 claims abstract description 216
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 191
- 239000007789 gas Substances 0.000 claims description 11
- 239000011358 absorbing material Substances 0.000 claims description 4
- 239000013589 supplement Substances 0.000 description 13
- 238000005259 measurement Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000011897 real-time detection Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 238000005339 levitation Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002887 superconductor Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The present invention provides a kind of level monitoring system based on ultrasound, which includes: ultrasonic sensor, controller, auto-pressurizing nitrogen storage tank, main solenoid valve, secondary solenoid valve, pressure charging valve, exhaust reducing valve and exhaust valve.The level value of the liquid nitrogen in liquid nitrogen container can be measured in real time and be shown using the present invention, and realize the function of carrying out automatic liquid supply to liquid nitrogen container.
Description
Technical field
This application involves liquid level monitoring technical field more particularly to a kind of level monitoring systems based on ultrasound.
Background technique
In high-temperature superconducting magnetic levitation technology, usually superconduction block material is immersed in liquid nitrogen, is lowered into its temperature
Superconducting state, superconduction block material and external magnetic field into superconducting state can reach stable suspersion.In high temperature superconductor magnetic levitation vehicle
Whole service during, it is necessary to assure superconduction block material is the liquid nitrogen being immersed in liquid nitrogen container (for example, vehicle-mounted Dewar) always
The inside is just avoided that and quenches phenomenon.High-temperature superconductor, which quenches to will lead to train and lose suspending power and track, occurs friction very
To derailing.
However, can not be detected by an unaided eye in liquid nitrogen container due to the metal material and vacuum insulation characteristic of liquid nitrogen container
Remaining liquid nitrogen liquid level you must use suitable liquid nitrogen level monitoring system and carry out to the liquid nitrogen level in liquid nitrogen container
Monitoring, to judge whether to need to fill liquid nitrogen in time.
Currently, liquid nitrogen level monitoring method in the prior art is usually all to measure liquid nitrogen appearance using the method for contact
Liquid level in device, and liquid nitrogen level has been obtained and then by being converted in closed and not visible liquid nitrogen container in measurement
Liquid level.By the way that highest and lowest liquid level, fluid infusion and drain when needed, to control in liquid nitrogen container is arranged
Liquid nitrogen level height is in default range.
But since monitoring method in the prior art is using contact type measurement, it is therefore desirable to by cable and sensing
Device is introduced into liquid nitrogen container, this will increase heat transfer to increase the loss of liquid nitrogen.On the other hand, liquid nitrogen is that temperature is extremely low
Liquid and readily volatilized therefore high for the material requirements of the hardware such as the sensor of contact type measurement, lead, and liquid nitrogen
The huge temperature difference inside and outside container will lead to sensor surface and frost occurs, to would necessarily affect entire monitoring system
Precision and long-time stability are not suitable for measuring for a long time so easily causing measurement error.In addition, in the prior art to liquid nitrogen liquid
The monitoring in face is a kind of automanual monitoring scheme, needs the participation of people, cannot achieve the real-time detection to liquid nitrogen level, low
Liquid level warning, liquid nitrogen auto-filling, full of the functions such as automatically cutting off and remind.
Summary of the invention
In view of this, the present invention provides a kind of level monitoring systems based on ultrasound, so as to liquid nitrogen container
The level value of interior liquid nitrogen is measured in real time and shows, and realizes the function that automatic liquid supply is carried out to liquid nitrogen container.
Technical solution of the present invention is specifically achieved in that
A kind of level monitoring system based on ultrasound, the system include: ultrasonic sensor, controller, auto-pressurizing
Nitrogen storage tank, main solenoid valve, secondary solenoid valve, pressure charging valve, exhaust reducing valve and exhaust valve；
The ultrasonic sensor is arranged in the top of the gas outlet of the liquid nitrogen container for holding liquid nitrogen, and with the control
The analog input channel of device processed connects；
The controller respectively with ultrasonic sensor, main solenoid valve, secondary solenoid valve, exhaust reducing valve, pressure charging valve, exhaust
Valve is connected with host computer；
One end of first liquid-transport pipe-line is protruded into the liquid nitrogen in auto-pressurizing nitrogen storage tank, described in other end stretching
Auto-pressurizing nitrogen storage tank is connect with the main solenoid valve；
One end of the main solenoid valve is connect with first liquid-transport pipe-line, and one end of the other end and the liquid filling pipeline connects
It connects；
The other end of the liquid filling pipeline is connect with one end of the secondary solenoid valve；
The other end of the secondary solenoid valve is connect with one end of second liquid-transport pipe-line；
The bottom of second liquid-transport pipe-line is protruded into the liquid nitrogen container, and the liquid nitrogen container and described time are stretched out in top
Solenoid valve connection；
The exhaust valve is arranged on the liquid filling pipeline；
The bottom of the gas relief line is protruded into the auto-pressurizing nitrogen storage tank, and the auto-pressurizing liquid is stretched out at top
Nitrogen holding vessel is connect with the exhaust reducing valve；
The bottom of the pressure pipeline is protruded into the auto-pressurizing nitrogen storage tank, and the auto-pressurizing liquid is stretched out at top
Nitrogen holding vessel is connect with the pressure charging valve.
Preferably, being additionally provided with sound-absorbing material at the gas outlet of the liquid nitrogen container.
Preferably, the system also includes: one or more signal lamps；
The controller is connect with each signal lamp respectively, and the on-off of each signal lamp is controlled by control signal.
Preferably, the controller is programmable logic controller (PLC).
Preferably, the host computer is PC, server or control centre.
As above as it can be seen that in level monitoring system based on ultrasound in the present invention, due to being using supersonic sensing
Device monitors the liquid level in liquid nitrogen container, it is not necessary that cable and sensor to be introduced into liquid nitrogen container, therefore is a kind of non-contact
The measurement method of formula, and it is not contact type measurement mode, so as to be effectively prevented from the heat of leakage caused by contact type measurement
Problem avoids the loss of liquid nitrogen caused by heat transfer；Moreover, because ultrasonic sensor does not need contact liquid nitrogen container,
Therefore the phenomenon that also avoiding sensor surface frosting caused by the huge temperature difference inside and outside liquid nitrogen container, monitoring accuracy is higher,
It is more acurrate, improve the precision and long-time stability of entire monitoring system.In addition, level monitoring system in the present invention can be with
The liquid level in liquid nitrogen container arrived according to real-time detection, supplements liquid nitrogen from trend liquid nitrogen container, to realize full automatic liquid
Nitrogen auto-filling, without the participation of staff, but also can reduction filling time and liquid nitrogen loss.In addition, this
Filling and prompting etc. is automatically stopped after level monitoring system in invention can also further realize low liquid level warning, liquid nitrogen is full of
Function.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the level monitoring system based on ultrasound in the embodiment of the present invention.
Specific embodiment
For technical solution of the present invention and advantage is more clearly understood, below in conjunction with drawings and the specific embodiments, to this
Invention is described in further detail.
Fig. 1 is the structural schematic diagram of the level monitoring system based on ultrasound in the embodiment of the present invention.
As shown in Figure 1, the level monitoring system based on ultrasound in the embodiment of the present invention include: ultrasonic sensor 4,
Controller 14, auto-pressurizing nitrogen storage tank 12, main solenoid valve 9, secondary solenoid valve 6, pressure charging valve 11, exhaust reducing valve 10 and exhaust
Valve 7；
The ultrasonic sensor 4 is arranged in the top of the gas outlet 3 of the liquid nitrogen container 2 for holding liquid nitrogen 1, and with institute
State the analog input channel connection of controller 14；
The controller 14 respectively with ultrasonic sensor 4, main solenoid valve 9, secondary solenoid valve 6, exhaust reducing valve 10, pressurization
Valve 11, exhaust valve 7 and host computer 13 connect；
One end of first liquid-transport pipe-line 21 is protruded into the liquid nitrogen in auto-pressurizing nitrogen storage tank 12, and the other end stretches out
The auto-pressurizing nitrogen storage tank 12 is connect with the main solenoid valve 9；
One end of the main solenoid valve 9 is connect with first liquid-transport pipe-line 21, and the one of the other end and the liquid filling pipeline 8
End connection；
The other end of the liquid filling pipeline 8 is connect with one end of the secondary solenoid valve 6；
The other end of the secondary solenoid valve 6 is connect with one end of second liquid-transport pipe-line 22；
The bottom of second liquid-transport pipe-line 22 is protruded into the liquid nitrogen container 2, and the liquid nitrogen container 2 and institute are stretched out in top
Time solenoid valve 6 is stated to connect；
The exhaust valve 7 is arranged on the liquid filling pipeline 8；
The bottom of the gas relief line 23 is protruded into the auto-pressurizing nitrogen storage tank 12, and top is stretched out described from pressurization
Formula nitrogen storage tank 12 is connect with the exhaust reducing valve 10；
The bottom of the pressure pipeline 24 is protruded into the auto-pressurizing nitrogen storage tank 12, and top is stretched out described from pressurization
Formula nitrogen storage tank 12 is connect with the pressure charging valve 11.
In above-mentioned level monitoring system based on ultrasound, ultrasonic sensor can emit sound wave, and the sound wave is logical
The gas outlet for crossing liquid nitrogen container enters the inside of liquid nitrogen container, reflects at the liquid level in liquid nitrogen container.When ultrasonic wave passes
When sensor detects the echo being reflected back, ultrasonic sensor transmitting sound wave and the time for receiving sound wave can pass through control
The analog input channel of device is input in controller.
Difference between sending time and receiving time of the controller by calculating sound wave, can according to the difference and
The distance at the liquid level in ultrasonic sensor to liquid nitrogen container is calculated in the velocity of sound.Then, further according to the ultrasonic sensor
Mounting height and liquid nitrogen container height, the current level value of the liquid nitrogen in liquid nitrogen container can be calculated.The control
The current level value of liquid nitrogen in liquid nitrogen container can be sent to host computer (for example, being sent to by PC/PPI cable by device
Position machine) so that user can be by host computer come the level value of the liquid nitrogen in real-time monitoring liquid nitrogen container.
In addition, due to the controller also respectively with main solenoid valve, secondary solenoid valve, exhaust reducing valve, pressure charging valve, exhaust valve and
Host computer connection, therefore the controller can also be by control signal (for example, the digital output channel by controller exports
High level or low level) control the on-off of main solenoid valve, secondary solenoid valve, exhaust reducing valve, pressure charging valve and exhaust valve, so as to
Further to realize the function to liquid nitrogen container automatic liquid supply.
For example, when controller emits sound wave according to ultrasonic sensor and receives time and the supersonic sensing of sound wave
The mounting height of device and the height of liquid nitrogen container, are calculated after the current level value of the liquid nitrogen in liquid nitrogen container, Ke Yigen
It determines the need for supplementing liquid nitrogen into liquid nitrogen container according to the current level value of the liquid nitrogen in liquid nitrogen container.For example, working as liquid nitrogen
When the current level value of liquid nitrogen in container is less than preset minimum level value, it can start to supplement liquid nitrogen into liquid nitrogen container.
When needing to supplement liquid nitrogen into liquid nitrogen container, controller can be made on liquid filling pipeline 8 by controlling signal
(when not needing to supplement liquid nitrogen into liquid nitrogen container, the exhaust valve 7 is in the open state, to guarantee to fill for the normally opened closing of exhaust valve 7
Air pressure in liquid pipe road 8 is the pressure of a safety, to prevent in liquid filling pipeline 8 air pressure excessive and lead to 8 quilt of liquid filling pipeline
It destroys；And when needing to supplement liquid nitrogen into liquid nitrogen container or liquid filling pipeline 8 is pre-chilled, in order to guarantee in liquid filling pipeline 8
There are enough air pressures, liquid nitrogen to be pressed into liquid nitrogen container or liquid filling pipeline 8 using pressure difference, it is therefore desirable to close the exhaust valve
7), so that the normally opened exhaust reducing valve 10 in auto-pressurizing nitrogen storage tank 12 is closed (is not needing to supplement into liquid nitrogen container
When liquid nitrogen, the exhaust reducing valve 10 is in the open state), and make the normally closed pressure charging valve 11 in auto-pressurizing nitrogen storage tank 12
Open (when not needing to supplement liquid nitrogen into liquid nitrogen container, which is in close state).At this point, external heat will pass through
Pressure charging valve and pressure pipeline enter auto-pressurizing nitrogen storage tank, so that the liquid nitrogen in auto-pressurizing nitrogen storage tank is accelerated to steam
Hair, so that the air pressure in auto-pressurizing nitrogen storage tank increases, to achieve the purpose that pressurization.
When the air pressure in auto-pressurizing nitrogen storage tank increases, liquid nitrogen in auto-pressurizing nitrogen storage tank will be along the
One liquid-transport pipe-line rises.In addition, before supplementing liquid nitrogen into liquid nitrogen container needing that first liquid filling pipeline is pre-chilled.Therefore,
Controller can the normally closed main solenoid valve on the first liquid-transport pipe-line open (not need to liquid nitrogen by controlling signal at this time
In container when supplement liquid nitrogen, which is in close state), and the secondary solenoid valve on the second liquid-transport pipe-line is closed,
Therefore the liquid nitrogen in auto-pressurizing nitrogen storage tank will enter liquid filling pipeline by main solenoid valve along the first liquid-transport pipe-line
In.Since main solenoid valve is opened at this time, and secondary solenoid valve is in closed state, therefore enters the liquid nitrogen in liquid filling pipeline
It will promptly vaporize, so that the temperature of liquid filling pipeline is promptly reduced.At this point, controller can be opened by control signal
Liquid filling pipeline will be discharged from the exhaust valve 7 in exhaust valve 7 on liquid filling pipeline 8, the liquid nitrogen after vaporization.
After preset duration is pre-chilled, controller can by control signal-off liquid filling pipeline 8 on exhaust valve 7, and
The secondary solenoid valve on the second liquid-transport pipe-line is opened, so that the liquid nitrogen of liquid filling pipeline 8 flows into liquid nitrogen container 2, is started to liquid
Liquid nitrogen is supplemented in nitrogen cascade 2.
When no longer needing to supplement liquid nitrogen into liquid nitrogen container 2 (for example, the current level value of the liquid nitrogen in liquid nitrogen container is big
When preset highest fluid value), controller can pass through the secondary electromagnetism on control the second liquid-transport pipe-line of signal-off
Valve closes the main solenoid valve on the first liquid-transport pipe-line, and opens the exhaust valve 7 on liquid filling pipeline 8, stops into liquid nitrogen container 2
Liquid nitrogen is supplemented, and each solenoid valve is made to be restored to the state before fluid infusion, is automatically stopped filling after liquid nitrogen is full of so as to realize
The function of dress.At this point, controller can also send prompting message by position machine further up, to inform that user has been completed liquid nitrogen
Auto-filling.
In addition, in the inventive solutions, when not needing to supplement liquid nitrogen into liquid nitrogen container, auto-pressurizing liquid nitrogen
Exhaust reducing valve 10 on holding vessel 12 be it is in the open state, so as to discharge the gas in auto-pressurizing nitrogen storage tank
Pressure, to maintain the pressure in auto-pressurizing nitrogen storage tank to be in steady state.And when needs supplement liquid nitrogen into liquid nitrogen container
When, controller can make the exhaust reducing valve 10 close by controlling signal, and open pressure charging valve 11, so that auto-pressurizing liquid
Liquid nitrogen in nitrogen holding vessel accelerates evaporation, so that the air pressure in auto-pressurizing nitrogen storage tank increases, so that from increasing
Liquid nitrogen in pressure type nitrogen storage tank is by air pressure indentation liquid filling pipeline 8.
In addition, in the inventive solutions, when the current level value of the liquid nitrogen in liquid nitrogen container is less than preset report
When alert fluid value, controller can also send warning message to host computer, with remind user current level value already below report
Alert fluid value, needs to supplement liquid nitrogen into liquid nitrogen container.
According to foregoing description it is found that can not only be held to liquid nitrogen by above-mentioned level monitoring system based on ultrasound
The level value of liquid nitrogen in device is measured in real time, and can also realize that low liquid level warning, liquid nitrogen auto-filling, liquid nitrogen are full of afterwards certainly
It is dynamic to stop the filling and functions such as prompting.
In addition, preferably, in one particular embodiment of the present invention, being also set up at the gas outlet 3 of the liquid nitrogen container 2
There is sound-absorbing material 5.Returning for other field emissions in ultrasonic sensor full transmitting angle can be effectively reduced in the sound-absorbing material 5
Wave interference, to further improve the accuracy of the monitored results of system.
In addition, preferably, in one particular embodiment of the present invention, in the level monitoring system based on ultrasound
It can further include: one or more signal lamps 15；
The controller 14 connect respectively with each signal lamp 15 (for example, by the digital output channel of controller with
The connection of each signal lamp), and control by control signal the on-off of each signal lamp 15, so as to realize liquid level instruction,
Low liquid level warning such as is automatically reminded at the functions after being full of.
In addition, preferably, in one particular embodiment of the present invention, the controller can be Programmable logical controller
Device (PLC).
In addition, preferably, in one particular embodiment of the present invention, the host computer can be PC, service
The various equipment such as device or control centre.By the way that configuration software is arranged in the host computer, the host computer can be according to reception
The data arrived, real-time display liquid nitrogen level can also further generate Historical Alerts and related data report etc..
Further, since temperature is affected to the spread speed of sound wave, therefore to the current of the liquid nitrogen in liquid nitrogen container
When liquid level is monitored, it can also further consider the huge temperature difference inside and outside liquid nitrogen container to the shadow of the accuracy of monitoring result
It rings.
It is therefore advantageous to, it in one particular embodiment of the present invention, can be with after ultrasonic sensor is set
Temperature-compensating is carried out to the ultrasonic sensor.
For example, temperature-compensating can be carried out to the ultrasonic sensor by step as described below:
Step 1, after ultrasonic sensor installation being fixed, the liquid level of the liquid nitrogen in liquid nitrogen container is adjusted to highest liquid level
Value.
Step 2, the current level value of the liquid nitrogen in liquid nitrogen container is obtained by ultrasonic sensor measurement, and this is current
Level value is as the first level value.
Step 3, the liquid level of the liquid nitrogen in liquid nitrogen container is adjusted to minimum level value.
Step 4, the current level value of the liquid nitrogen in liquid nitrogen container is obtained by ultrasonic sensor measurement, and this is current
Level value is as the second level value.
Step 5, according to highest fluid value, minimum level value, the first level value and the second level value is calculated and liquid nitrogen
The corresponding temperature compensation value of each level value of liquid nitrogen in container.
Therefore, in the inventive solutions, when the liquid level of the liquid nitrogen in liquid nitrogen container is in minimum level value and most
When any position between high liquid level (HLL) value, the first level value and the second level value may be by carry out temperature-compensating.
In the inventive solutions, above-mentioned temperature-compensating only need to be carried out when ultrasonic sensor is installed for the first time,
Hereafter it then no longer needs to carry out above-mentioned temperature-compensating.
In conclusion in the inventive solutions, due to being monitored in liquid nitrogen container using ultrasonic sensor
Liquid level, it is not necessary that cable and sensor to be introduced into liquid nitrogen container, therefore be a kind of contactless measurement method, and not
Contact type measurement mode, so as to be effectively prevented from leakage heat problem caused by contact type measurement, avoid heat transfer and
The loss of caused liquid nitrogen；Moreover, because ultrasonic sensor does not need contact liquid nitrogen container, therefore also avoid liquid nitrogen container
Caused by the inside and outside huge temperature difference the phenomenon that sensor surface frosting, monitoring accuracy is higher, more acurrate, improves entire monitoring
The precision and long-time stability of system.In addition, the liquid nitrogen that the level monitoring system in the present invention can also be arrived according to real-time detection
Liquid level in container supplements liquid nitrogen from trend liquid nitrogen container, so that full automatic liquid nitrogen auto-filling is realized, without work
Make the participation of personnel, but also can reduction filling time and liquid nitrogen loss.In addition, the level monitoring system in the present invention is also
Low liquid level warning can be further realized, is automatically stopped after liquid nitrogen is full of filling and the functions such as reminds.In addition, in skill of the invention
In art scheme, since further temperature-compensating can also be carried out to ultrasonic sensor, the standard of level gauging can be improved
Exactness and precision.So the above-mentioned liquid level monitoring based on ultrasound compared with the relevant technologies in the prior art, in the present invention
The degree of automation of system is very high, and the ability for adapting to electromagnetic environment is strong, and man-machine interface is friendly, therefore is particularly suitable for magnetic suspension train
It is engineered this specific application scenario；Moreover, using controller (for example, PLC) plus host computer (for example, personal in the present invention
Computer) monitor mode, the complex electromagnetic environment being well suited on magnetic suspension train.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (5)
1. a kind of level monitoring system based on ultrasound, which is characterized in that the system include: ultrasonic sensor, controller,
Auto-pressurizing nitrogen storage tank, main solenoid valve, secondary solenoid valve, pressure charging valve, exhaust reducing valve and exhaust valve；
The ultrasonic sensor is arranged in the top of the gas outlet of the liquid nitrogen container for holding liquid nitrogen, and with the controller
Analog input channel connection；
The controller respectively with ultrasonic sensor, main solenoid valve, secondary solenoid valve, exhaust reducing valve, pressure charging valve, exhaust valve and
Host computer connection；
One end of first liquid-transport pipe-line is protruded into the liquid nitrogen in auto-pressurizing nitrogen storage tank, and the other end stretches out described from increasing
Pressure type nitrogen storage tank is connect with the main solenoid valve；
One end of the main solenoid valve is connect with first liquid-transport pipe-line, and the other end is connect with one end of the liquid filling pipeline；
The other end of the liquid filling pipeline is connect with one end of the secondary solenoid valve；
The other end of the secondary solenoid valve is connect with one end of second liquid-transport pipe-line；
The bottom of second liquid-transport pipe-line is protruded into the liquid nitrogen container, and the liquid nitrogen container and the secondary electromagnetism are stretched out in top
Valve connection；
The exhaust valve is arranged on the liquid filling pipeline；
The bottom of the gas relief line is protruded into the auto-pressurizing nitrogen storage tank, and the auto-pressurizing liquid nitrogen storage is stretched out at top
Tank is deposited to connect with the exhaust reducing valve；
The bottom of the pressure pipeline is protruded into the auto-pressurizing nitrogen storage tank, and the auto-pressurizing liquid nitrogen storage is stretched out at top
Tank is deposited to connect with the pressure charging valve.
2. system according to claim 1, it is characterised in that:
Sound-absorbing material is additionally provided at the gas outlet of the liquid nitrogen container.
3. system according to claim 1, which is characterized in that the system also includes: one or more signal lamps；
The controller is connect with each signal lamp respectively, and the on-off of each signal lamp is controlled by control signal.
4. system according to claim 1, it is characterised in that:
The controller is programmable logic controller (PLC).
5. system according to claim 1, it is characterised in that:
The host computer is PC, server or control centre.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114995559A (en) * | 2022-04-11 | 2022-09-02 | 西南石油大学 | Control system and control method of intelligent biological sample repository |
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