CN113551737B - Liquid level measuring device and measuring method - Google Patents
Liquid level measuring device and measuring method Download PDFInfo
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- CN113551737B CN113551737B CN202110831544.2A CN202110831544A CN113551737B CN 113551737 B CN113551737 B CN 113551737B CN 202110831544 A CN202110831544 A CN 202110831544A CN 113551737 B CN113551737 B CN 113551737B
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- 239000007788 liquid Substances 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 20
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- 230000000875 corresponding effect Effects 0.000 claims abstract description 42
- 230000004044 response Effects 0.000 claims abstract description 42
- 238000012545 processing Methods 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 100
- 230000008859 change Effects 0.000 claims description 11
- 239000002912 waste gas Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 14
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 230000002285 radioactive effect Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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- 239000000941 radioactive substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- G01F23/14—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 measurement of pressure
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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
- G01F23/14—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 measurement of pressure
- G01F23/18—Indicating, recording or alarm devices actuated electrically
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention relates to the technical field of liquid level measurement, in particular to a liquid level measuring device and a liquid level measuring method, which comprise a closed container, an air source, an air inlet pipeline, an air outlet pipeline, a pressure response action unit and an electric signal processing unit, wherein the air source is connected with the air inlet pipeline; the pressure response action unit is arranged at the part of each air outlet pipeline outside the closed container and is electrically connected with the electric signal processing unit; the pressure response action unit responds to the airflow of each air outlet pipeline to perform corresponding action; the electric signal processing unit receives each action signal, processes and judges the relationship between the height position of one end of each corresponding air outlet pipeline in the closed container and the liquid level of the liquid to be detected. When the invention is used for measurement, only the closed container is in an extreme environment, the rest parts are in a normal environment, and no electronic device is arranged in the closed container, so that the corrosion resistance, the corrosion resistance and the like are greatly improved, the service life is prolonged, the result is reliable, and the invention is used for measuring the liquid level in a narrow closed radioactive space.
Description
Technical Field
The invention relates to the technical field of liquid level measurement based on a pneumatic technology, in particular to a liquid level measuring device and a liquid level measuring method.
Background
When liquid level measurement and monitoring of liquid (including corrosive and high and low temperature liquid) are performed in environments of high radioactivity, extreme temperature and the like, due to the structure and the measurement principle of the liquid level meter or the liquid level sensor on the market at present, electronic elements on the liquid level meter or the liquid level sensor are also exposed in environments of high radioactivity, extreme temperature and the like during measurement, and due to the fact that the electronic elements are not resistant to irradiation, corrosion and the like, the existing liquid level meter or the liquid level sensor cannot normally work in extreme environments, or is short in service life, unreliable in detection results and the like.
When the liquid level measurement and monitoring of liquid are carried out in a narrow closed space, the existing liquid level meter or liquid level sensor does not meet the installation condition due to large volume or other reasons.
Disclosure of Invention
The first purpose of the invention is to provide a liquid level measuring device, which solves the technical problem that the existing liquid level measuring device can not meet the measuring requirements under the conditions of high radioactivity, extreme temperature, narrow closed space and the like.
The invention is realized by the following technical scheme: the device comprises a closed container, an air source, an air inlet pipeline, an air outlet pipeline, a pressure response action unit and an electric signal processing unit;
the air source is communicated with the air inlet pipeline, one end of the air inlet pipeline is inserted into the closed container, the air inlet pipeline is provided with a pressure reducing valve, two ends of each air outlet pipeline respectively enter and penetrate out of the closed container, the pressure response action unit is arranged at the part of each air outlet pipeline outside the closed container, and the pressure response action unit is electrically connected with the electric signal processing unit;
the pressure response action unit responds to the pressure change of each air outlet pipeline to perform corresponding action and outputs each action signal to the electric signal processing unit;
the electric signal processing unit receives each action signal output by the pressure response action unit, processes and judges the height position relation between one end of each corresponding air outlet pipeline positioned in the closed container and the liquid level of the detected liquid, and outputs a liquid level state signal of the detected liquid based on the height position relation.
Preferably, the pressure response action unit is composed of a plurality of pressure response action devices, the output end of each pressure response action device is connected with the corresponding input end of the electric signal processing unit, the pressure response action devices are correspondingly arranged on the gas outlet pipelines, and the depths of the gas outlet pipelines extending into the closed container are different.
Preferably, each pressure response action device is a pressure switch, and each pressure switch responds to the pressure change in each air outlet pipeline to perform corresponding response action.
Preferably, a first one-way valve is further arranged on the air inlet pipeline, the first one-way valve is located between the pressure reducing valve and one end, located inside the closed container, of the air inlet pipeline, and a second one-way valve is arranged at one end, far away from the closed container, of each air outlet pipeline.
Preferably, the air inlet pipeline is further provided with a filter and a dryer, the filter is located between the air source and the pressure reducing valve, and the dryer is located between the pressure reducing valve and the first one-way valve.
Preferably, one end of each gas outlet pipeline, which is positioned outside the closed container, is communicated with a gas collection pipeline, and the gas collection pipeline is communicated with the waste gas treatment unit.
Preferably, the liquid-feeding device further comprises a liquid feeding pipe and a liquid discharging pipe, wherein the two ends of the liquid feeding pipe and the two ends of the liquid discharging pipe are respectively located inside and outside the closed container, and the parts of the liquid feeding pipe and the liquid discharging pipe located outside the closed container are respectively provided with a first stop valve and a second stop valve.
Preferably, the closed container, the air inlet pipe and the air outlet pipe are all made of metal materials.
The second object of the present invention is to provide a liquid level measuring method, based on the above liquid level measuring device, including the following steps: the gas source conveys gas into the gas inlet pipeline, the gas enters the closed container through the pressure reducing valve, and then stays in the closed space or flows into the gas outlet pipeline higher than the liquid level of the liquid to be detected and triggers the corresponding pressure response action unit on the gas outlet pipeline to perform corresponding action, the electric signal processing unit receives and processes the corresponding action signal, judges the height position relation between one end of each corresponding gas outlet pipeline in the closed container and the liquid level of the liquid to be detected according to whether each action signal is received or not, and outputs a liquid level state signal of the liquid to be detected based on the height position relation;
the device also comprises a gas collecting pipeline for collecting the gas flowing out of each gas outlet pipeline and treating the gas by a waste gas treatment unit communicated with the gas collecting pipeline.
Preferably, the gas drying device further comprises a filter and a dryer, wherein the filter is arranged between the gas source and the pressure reducing valve, and the dryer is arranged between the pressure reducing valve and the first one-way valve.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) According to the invention, the air source, the air inlet pipeline, the air outlet pipeline, the pressure response action unit and the electric signal processing unit are arranged, the electronic device is not arranged in the closed container, only the closed container is positioned in a radioactive region or an extreme temperature region or a strong radiation environment during measurement, and other parts are positioned in a normal environment, so that the electronic device is prevented from being arranged in the extreme environment, the performances of corrosion resistance, corrosion resistance and the like of the device are greatly improved, the service life is prolonged, the detection result is reliable, the installation requirement is low, the structure is simple, and the maintenance and the overhaul are convenient. And when the device is used for measurement in a narrow closed space, the pneumatic components are all arranged outside as only the closed container needs to be plugged, so that the device is also suitable. Based on the above, the invention can perform discontinuous measurement and monitoring of the liquid level under extreme conditions.
(2) The plurality of air outlet pipelines are arranged, and the pressure response action devices are correspondingly arranged, so that the states of the air outlet pipelines are monitored and are not interfered with each other, and the accuracy and reliability of the measurement result are ensured.
(3) The arrangement of the first one-way valve and the second one-way valve avoids interference caused when airflow in an external environment enters the measuring device, and prevents gas in the closed container from diffusing to the outside in an unexpected situation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: the device comprises an air source 1, a filter 2, a pressure reducing valve 3, a dryer 4, a first one-way valve 5, a first stop valve 6, a liquid inlet pipe 7, a liquid outlet pipe 8, a second stop valve 9, a gas inlet pipeline 10, a first gas outlet pipeline 11, a second gas outlet pipeline 12, a third gas outlet pipeline 13, a first pressure switch 14, a second pressure switch 15, a third pressure switch 16, a second one-way valve 17, an electric signal processing unit 18, an exhaust gas processing unit 19 and a closed container 20.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1:
a liquid level measuring device comprises a closed container 20, and further comprises an air source 1, an air inlet pipeline 10, an air outlet pipeline, a pressure response action unit and an electric signal processing unit 18.
The gas source 1 may be a gas tank filled with purified air, nitrogen or other inert gas to ensure that the gas flowing out of the gas source 1 is insoluble or poorly soluble in the liquid to be measured and does not react with the liquid to be measured. The gas source 1 is communicated with a gas inlet pipeline 10, one end of the gas inlet pipeline 10 is inserted into a closed container 20, and the closed container 20 is used for containing the liquid to be detected. The air inlet pipeline 10 is provided with a pressure reducing valve 3, the pressure of the gas flowing out from the gas source 1 is adjusted by the pressure reducing valve 3, two ends of each air outlet pipeline respectively enter and penetrate out of the closed container 20, and each air outlet pipeline and the air inlet pipeline 10 are hermetically connected with the closed container 20. The number of the outlet pipes can be 2, 3, 4, 5 or other numbers according to the requirement, and the depth of each outlet pipe extending into the closed container 20 can be equal, can be different, and preferably can be different. And in particular the depth to which each of the outlet lines is inserted into the closed vessel 20 may be set as desired. In this embodiment, three outlet pipes are provided as an example, a first outlet pipe 11, a second outlet pipe 12, and a third outlet pipe 13 are provided, and the depths of the first outlet pipe 11, the second outlet pipe 12, and the third outlet pipe 13 inserted into the sealed container 20 are sequentially increased.
The pressure response action unit is disposed at a portion of each gas outlet pipeline located outside the closed container 20, the pressure response action unit is composed of a plurality of pressure response action devices, such as a plurality of pressure switches or pressure relays, and is preferably configured as a pressure switch in this embodiment, the first pressure switch 14, the second pressure switch 15, and the third pressure switch 16 are respectively corresponding to the first gas outlet pipeline 11, the second gas outlet pipeline 12, and the third gas outlet pipeline 13, and the signal output end of each pressure switch is electrically connected with the corresponding signal input end of the electrical signal processing unit 18. And when the triggering condition that the state changes is not met, each pressure switch does not respond, is always in the original state and does not change the state. And when each pressure switch is triggered to respond and the state changes, if the triggering condition disappears, each pressure switch can automatically return to the original state until being triggered again and the state changes. In the invention, the triggering condition for the state change of each pressure switch is that the pressure in each air outlet pipeline changes. Each pressure switch performs a corresponding response action in response to a pressure change caused by gas flowing through the corresponding gas outlet pipeline, and outputs each action signal to the electric signal processing unit 18. For example, when there is airflow in the first air outlet pipeline 11, the pressure change triggers the first pressure switch 14 to perform a response action, the response action is received by the electrical signal processing unit 18 in the form of an electrical signal, and after the first pressure switch 14 performs the response action, after the detection is finished, the air source 1 does not continue to deliver air, the first air outlet pipeline 11 does not have airflow any more, the pressure does not change any more, and the first pressure switch 14 automatically resets. When no gas flows through the first outlet pipeline 11, the pressure in the first outlet pipeline 11 is not changed, the first pressure switch 14 does not perform a response action, and the electric signal processing unit 18 does not receive the electric signal.
The electric signal processing unit 18 receives each action signal output by the pressure response action unit, processes and judges the height position relation between one end of each corresponding gas outlet pipeline positioned in the closed container 20 and the liquid level of the measured liquid, and outputs a liquid level state signal of the measured liquid based on the height position relation.
Such as: when the liquid level of the liquid to be measured is higher than the end of the first outlet pipeline 11 located at the closed container 20, because the end of each outlet pipeline is located below the liquid level of the liquid to be measured, no gas flows through the first outlet pipeline 11, the second outlet pipeline 12 and the third outlet pipeline 13, so that the pressure in each outlet pipeline is unchanged, each corresponding pressure switch is in an original state, no corresponding response action is performed, and the electrical signal processing unit 18 does not receive a corresponding electrical signal.
When the liquid level of the measured liquid is lower than that of the first gas outlet pipeline 11 and higher than that of the second gas outlet pipeline 12, gas can pass through and be discharged from the first gas outlet pipeline 11, the pressure in the pipeline changes, the corresponding first pressure switch 14 responds to output a corresponding electric signal, no gas is discharged from the second gas outlet pipeline 12 and the third gas outlet pipeline 13, and no electric signal is output from the corresponding second pressure switch 15 and the corresponding third pressure switch 16. The electrical signal processing unit 18 receives the electrical signal output by the first pressure switch 14, processes the electrical signal, determines that the liquid level of the detected liquid is lower than the first gas outlet pipeline 11 and higher than the second and third gas outlet pipelines according to the electrical signal received by the first pressure switch 14 and the electrical signals output by the second and third pressure switches, and outputs the determined liquid level state of the detected liquid to a subsequent component in the form of an electrical signal, where the subsequent component may be a display, a printer, or the like, and then presents the liquid level state, and certainly may be other signal receiving components, or other wireless transmission modes, and the like.
When the liquid level of the liquid to be measured is lower than the second gas outlet pipeline 12 and higher than the third gas outlet pipeline 13, gas can pass through and be discharged from the first gas outlet pipeline and the second gas outlet pipeline, the pressure in the pipelines changes, the corresponding first pressure switch and the corresponding second pressure switch respond and output corresponding electric signals, no gas is discharged from the third gas outlet pipeline 13, and no electric signal is output from the third pressure switch 16. The electric signal processing unit 18 determines that the liquid level of the liquid to be measured is lower than the first and second gas outlet pipelines and higher than the third gas outlet pipeline 13 according to the fact that the electric signals of the first and second pressure switches are received but the electric signal output by the third pressure switch 16 is not received, and outputs the determined liquid level state of the liquid to be measured to subsequent components in the form of the electric signal.
Similarly, if the electrical signal processing unit 18 receives an electrical signal of the pressure switch corresponding to a certain gas outlet pipeline, it indicates that the height of the gas outlet pipeline is higher than the liquid level of the liquid to be measured, and if the electrical signal processing unit 18 does not receive an electrical signal of the pressure switch corresponding to a certain gas outlet pipeline, it indicates that the height of the gas outlet pipeline is lower than the liquid level of the liquid to be measured. The state that the height of any one of the gas outlet pipelines is higher or lower than the position relation of the liquid level of the liquid to be detected is the liquid level state of the liquid to be detected.
Those skilled in the art should understand that the electrical signal processing unit 18 in the present embodiment is a known technology, and can be obtained by connecting one or more processors, the processing program in the processor is preset according to the processing requirement of the present invention, and the electrical signal processing unit 18 performs the corresponding processes of processing, determining, outputting, and the like according to the program command.
Example 2:
on the basis of the embodiment 1, the further technical scheme is as follows: the air inlet pipeline 10 is also provided with a first one-way valve 5, the first one-way valve 5 is positioned between the reducing valve 3 and one end of the air inlet pipeline 10 in the closed container 20, and one end of each air outlet pipeline, which is far away from the closed container 20, is provided with a second one-way valve 17. The first check valve 5 and the second check valve 17 can make the gas in the device flow in a single direction, and avoid the interference of the external environment.
The air inlet pipeline 10 is also provided with a filter 2 and a dryer 4, the filter 2 is positioned between the air source 1 and the pressure reducing valve 3, and the dryer 4 is positioned between the pressure reducing valve 3 and the first one-way valve 5. The filter 2 is internally provided with a filter screen which plays a role in filtering gas, and the drier 4 is filled with a drying agent for drying the gas and eliminating the influence of moisture in the gas.
One end of each air outlet pipeline outside the closed container 20 is communicated with a gas collecting pipeline, and the gas collecting pipeline is communicated with a waste gas treatment unit 19. The exhaust gas treatment unit 19 treats the exhausted gas to prevent the radioactive substances carried by the gas flowing through the closed container 20 in the radioactive region from flowing into the environment, thereby causing environmental pollution and personal safety threat.
The closed container 20 is also connected with a liquid inlet pipe 7 and a liquid outlet pipe 8, and the two ends of the liquid inlet pipe 7 and the liquid outlet pipe 8 are respectively positioned inside and outside the closed container 20 and are respectively used for pouring in and flowing out of the liquid to be measured. The lengths of the liquid inlet pipe 7 and the liquid outlet pipe 8 can be set as required, and the parts of the liquid inlet pipe 7 and the liquid outlet pipe 8 outside the closed container 20 are correspondingly provided with a first stop valve 6 and a second stop valve 9.
The closed container 20, the air inlet pipe and the air outlet pipe are all made of metal materials so as to resist irradiation, low temperature, corrosion and the like.
If the measured liquid level state of the measured liquid needs to be increased or reduced, the number of the air outlet pipelines and the corresponding one-way valves, pressure switches or pressure relays is increased or reduced according to the situation.
Example 3:
a liquid level measuring method was performed based on the liquid level measuring apparatuses of examples 1 and 2.
The method comprises the following steps:
when liquid level measurement is carried out, the first stop valve 6 and the second stop valve 9 on the liquid inlet pipe 7 and the liquid outlet pipe 8 are closed at first, so that the whole gas flowing channel is in a closed state. Open air supply 1, nitrogen gas or other entering air inlet pipeline 10 of inertia, in filter 2's filtration, relief pressure valve 3, desicator 4's drying, first check valve 5 enter into airtight container 20 in proper order, if the height of each air outlet pipeline all is less than the liquid level of the liquid of being surveyed, then nitrogen gas can be detained in airtight space, signal of telecommunication processing unit 18 can not receive the signal of telecommunication, then close air supply 1, open the stop valve on feed liquor pipe 7, the drain pipe 8.
If the height of a certain gas outlet pipeline is higher than the liquid level of the liquid to be measured, gas can be discharged through the gas outlet pipeline, meanwhile, the corresponding pressure switch carries out response action, the electric signal processing unit 18 receives and processes corresponding electric signals and judges that the height of the gas outlet pipeline is higher than the liquid level of the liquid to be measured. The discharged gas is discharged after being treated in the exhaust gas treatment unit 19.
During measurement, only the closed container 20 is in a radioactive region, and the rest parts, such as the gas source 1, the first one-way valve 5, the electric signal processing unit 18, the waste gas processing unit 19, the gas outlet pipeline, the liquid inlet pipe 7 and the liquid outlet pipe 8, are in a normal environment outside the closed container 20.
It should also be understood by those skilled in the art that the measurement in fig. 1 is shown in a radioactive environment, and may be in an extreme temperature environment, a narrow enclosed space, a strong radiation environment, etc., or in a superimposed area of two, three, or four of these environments, as well as a conventional environment.
Those skilled in the art will appreciate that all or part of the steps of the above-described facts and methods can be implemented by a program instructing relevant hardware to perform the steps, and the related program or the described program can be stored in a computer-readable storage medium, and the program, when executed, includes the steps of: corresponding method steps are introduced, and the storage medium can be ROM/RAM, magnetic disk, optical disk, etc.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A liquid level measuring device, includes airtight container, its characterized in that: the device also comprises an air source, an air inlet pipeline, an air outlet pipeline, a pressure response action unit and an electric signal processing unit;
the air source is communicated with the air inlet pipeline, one end of the air inlet pipeline is inserted into the closed container, the air inlet pipeline is provided with a pressure reducing valve, two ends of each air outlet pipeline respectively enter and penetrate out of the closed container, the pressure response action unit is arranged at the part of each air outlet pipeline outside the closed container, and the pressure response action unit is electrically connected with the electric signal processing unit;
the pressure response action unit responds to the pressure change of each air outlet pipeline to perform corresponding action and outputs each action signal to the electric signal processing unit;
the electric signal processing unit receives each action signal output by the pressure response action unit, processes and judges the height position relation between one end of each corresponding air outlet pipeline positioned in the closed container and the liquid level of the detected liquid, and outputs a liquid level state signal of the detected liquid based on the height position relation;
the pressure response action unit is composed of a plurality of pressure response action devices, the output end of each pressure response action device is connected with the corresponding input end of the electric signal processing unit, the pressure response action devices are correspondingly arranged on each air outlet pipeline, and the depths of the air outlet pipelines extending into the closed container are different; each pressure response action device is a pressure switch, and each pressure switch responds to the pressure change in each air outlet pipeline to perform corresponding response action;
when the liquid level of the detected liquid is higher than the end part of any one of the air outlet pipelines, no pressure change exists in the air outlet pipeline, and no action signal is output by the pressure switch corresponding to the air outlet pipeline; when the liquid level of the detected liquid is lower than the end part of any one of the air outlet pipelines, pressure change exists in the air outlet pipeline, and the pressure switch corresponding to the air outlet pipeline outputs an action signal.
2. A liquid level measuring device according to claim 1, characterized in that: the air inlet pipeline is also provided with a first one-way valve, the first one-way valve is positioned between the pressure reducing valve and one end of the air inlet pipeline, which is positioned in the closed container, and one end of each air outlet pipeline, which is far away from the closed container, is provided with a second one-way valve.
3. A liquid level measuring device according to claim 2, characterized in that: the air inlet pipeline is also provided with a filter and a dryer, the filter is positioned between the air source and the pressure reducing valve, and the dryer is positioned between the pressure reducing valve and the first one-way valve.
4. A liquid level measuring apparatus according to claim 1, wherein: one end of each air outlet pipeline, which is positioned outside the closed container, is communicated with a gas collecting pipeline, and the gas collecting pipeline is communicated with a waste gas treatment unit.
5. A liquid level measuring device according to claim 1, characterized in that: the liquid inlet pipe and the liquid outlet pipe are respectively positioned inside and outside the closed container, and the parts of the liquid inlet pipe and the liquid outlet pipe outside the closed container are respectively provided with a first stop valve and a second stop valve.
6. A liquid level measuring device according to claim 1, characterized in that: the closed container, the air inlet pipe and the air outlet pipe are all made of metal materials.
7. A liquid level measuring method based on the liquid level measuring apparatus of claim 1, characterized by comprising the steps of:
the gas source conveys gas into the gas inlet pipeline, the gas enters the closed container through the pressure reducing valve, and then stays in the closed space or flows into the gas outlet pipeline higher than the liquid level of the liquid to be detected and triggers the corresponding pressure response action unit on the gas outlet pipeline to perform corresponding action, the electric signal processing unit receives and processes the corresponding action signal, judges the height position relation between one end of each corresponding gas outlet pipeline in the closed container and the liquid level of the liquid to be detected according to whether each action signal is received or not, and outputs a liquid level state signal of the liquid to be detected based on the height position relation;
the device also comprises a gas collecting pipeline for collecting the gas flowing out of each gas outlet pipeline and treating the gas by a waste gas treatment unit communicated with the gas collecting pipeline.
8. A liquid level measuring method according to claim 7, characterized in that: the gas drying device further comprises a filter and a dryer, wherein the filter is arranged between the gas source and the pressure reducing valve, and the dryer is arranged between the pressure reducing valve and the first one-way valve.
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| US6513376B1 (en) * | 2001-10-10 | 2003-02-04 | Lsi Logic Corporation | Liquid level height measurement system |
| CN205615969U (en) * | 2016-04-20 | 2016-10-05 | 河北方矩自动化设备科技有限公司 | Safe storage metering device |
| CN107340027B (en) * | 2016-05-03 | 2020-04-24 | 神华集团有限责任公司 | Material level detection device and container for high-temperature solid material |
| CN107702761A (en) * | 2017-09-11 | 2018-02-16 | 江苏远望仪器集团有限公司 | Closed vessel liquid level measurement apparatus |
| CN109708707B (en) * | 2019-02-20 | 2020-10-13 | 中国海洋石油集团有限公司 | Gas flow measuring device and measuring method |
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