CN104596612A - Method and device for detecting liquid level and liquid capacity - Google Patents
Method and device for detecting liquid level and liquid capacity Download PDFInfo
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- CN104596612A CN104596612A CN201510038280.XA CN201510038280A CN104596612A CN 104596612 A CN104596612 A CN 104596612A CN 201510038280 A CN201510038280 A CN 201510038280A CN 104596612 A CN104596612 A CN 104596612A
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Abstract
The invention relates to a method and a device for detecting liquid level and liquid capacity. The device comprises an opening type quartz liquid level detector, a diaphragm and a micro-differential pressure measuring and control circuit, wherein the opening type quartz liquid level detector consists of a quartz tube at the collecting end and a quartz tube at the testing end; the quartz tubes are integrally formed; the quartz tube at the collecting end is used for collecting information of the tested liquid, and the quartz tube at the testing end is electrically connected with the micro-differential pressure measuring and control circuit through the diaphragm, and the bottom end of the quartz tube at the collecting end is provided with an inclined surface. The method comprises the following steps of (1) calibrating the opening type quartz liquid level detector, and pre-storing the calibrated parameters into the micro-differential pressure measuring and control circuit; (2) enabling the micro-differential pressure measuring and control circuit to collect a differential pressure signal in the opening type quartz liquid level detector, and calculating the liquid level of the tested liquid according to the preset relation between the differential pressure value and the liquid level in the opening type quartz liquid level detector, meanwhile outputting the tested value to external display equipment, and completing the detection. The device and the method can be used for measuring different liquid levels.
Description
Technical field
The present invention relates to detection method and the device of a kind of liquid level and liquid capacity, particularly about a kind of detection method for detecting liquid level in fixed container or liquid capacity and device, be highly suitable for the liquid detecting of the faint change of liquid level or small size capacity.
Background technology
At present, the method for level detection is a lot, and the principle of detection is simple, and usual is optical method and electric method, and optical method utilizes the marked difference of the upper and lower light transmission of liquid level to detect, and the method can detect the change of liquid level; Electric method utilizes the electric conductivity of liquid to measure usually.Above-mentioned Method And Principle is simple, but there is following problem: no matter 1 optical method or electric method all need and liquid comes into contact, be not therefore suitable for the environment that liquid may react with light source or electric current generation physical/chemical.2, when liquid level have fluctuation, steadily time, the error that optical method and electric method two kinds of methods are measured is all larger.3, for some nonconducting liquid, electric method is limited very large.
Summary of the invention
For the problems referred to above, the object of this invention is to provide one can be applied to the comparatively large and liquid of non-conductive, liquid level shake and directly do not contact with detection source, avoid occurring the liquid level of disturbance reponse occasion and the detection method of liquid capacity and device, its method is simple, highly sensitive, reappearance is better, is very suitable for the detection of faint change.
For achieving the above object, the present invention takes following technical scheme: the sniffer of a kind of liquid level and liquid capacity, it is characterized in that: it comprises open type quartz level sensor, a diaphragm and a micro-pressure-difference and measures and control circuit, and described open type quartz level sensor is made up of integrated collection terminal quartz ampoule and test lead quartz ampoule; Described collection terminal quartz ampoule is for gathering fluid to be measured information, and described test lead quartz ampoule is measured with described micro-pressure-difference by described diaphragm and control circuit is electrically connected; Described collection terminal quartz ampoule bottom is set to an inclined-plane.
Described micro-pressure-difference is measured and control circuit comprises micro-pressure sensor, processing of signal sources circuit, data storage change-over circuit and LCDs, the described open type quartz level sensor internal pressure differences original signal collected transfers in described processing of signal sources circuit by described micro-pressure sensor, amplification process is carried out to the pressure differential original signal received and obtains pressure differential measuring-signal, and by described processing of signal sources circuit, pressure differential measuring-signal is transferred in described data storage change-over circuit; Described data store change-over circuit and described LCDs carries out information interaction.
Described inclined-plane optimum incline angle is 45 °.
Described open type quartz level sensor adopts cylindrical structural, and the diameter of described collection terminal quartz ampoule is much larger than the diameter of described test lead quartz ampoule.
Based on a detection method for the sniffer of above-mentioned liquid level and liquid capacity, it comprises the following steps: 1) demarcate open type quartz level sensor, and the parameter of demarcation is pre-deposited micro-pressure-difference and to measure and in control circuit; Wherein, to open type quartz level sensor demarcate be to open type quartz level sensor inner air pressure and external atmospheric pressure difference and liquid level relational expression in coefficient demarcate, the relational expression of liquid level H and pressure difference value is: Δ H=a Δ P+b, H=H
0+ Δ H, in formula, Δ H is liquid level changing value, and Δ P is the pressure of air and the difference of external atmospheric pressure in open type quartz level sensor, H
0for liquid level when original liquid level or zero pressure difference, be constant, a, b are the normal parameter obtained after demarcating open type quartz level sensor; 2) measured by micro-pressure-difference and control circuit gather open type quartz level sensor in differential pressure signal, and calculate tested liquid level by the pressure difference value be preset in micro-pressure-difference measurement and control circuit and liquid level relational expression, and externally display device exports test value, completes detection.
A sniffer for liquid level and liquid capacity, is characterized in that: it comprises a closed quartzy level sensor, the diaphragm of a permeable watertight, a micro-pressure-difference are measured and control circuit and two unidirectional micro pumps; Described closed quartzy level sensor top is measured with described micro-pressure-difference by described diaphragm and control circuit is electrically connected; Described closed quartzy level sensor top also connects one for the described unidirectional micro pump of influent by pipeline, described closed quartzy level sensor bottom connects another for discharging the described unidirectional micro pump of liquid by pipeline, and unidirectional micro pump described in two is measured and control circuit control work by described micro-pressure-difference; Described closed quartzy level sensor is made up of integrated described open type quartz level sensor, the outer arm of quartz, L-type quartz arm and straight quartzy arm, it is outside that the outer arm of described quartz is set in described open type quartz level sensor, and the test lead quartz ampoule outer wall of the top of the outer arm of described quartz and described open type quartz level sensor links into an integrated entity, described test lead quartz ampoule measures with described micro-pressure-difference and control circuit is electrically connected; The outer arm top of described quartz is provided with integrated described L-type quartz arm and straight quartzy arm with it, and described L-type quartz arm and straight quartzy arm lay respectively at described test lead quartz ampoule side; Described L-type quartz arm entrance point connects the described unidirectional micro pump of influent, the bottom of the outer arm of described quartz by pipeline connect discharge liquid another described in unidirectional micro pump.
The bottom of the outer arm of described quartz adopts funnel type structure, and described funnel type structure endpiece connects unidirectional micro pump described in another of discharge liquid by pipeline.
The endpiece of described L-type quartz arm is set to an inclined-plane, and described inclined-plane optimum incline angle is 45 °; The inclined-plane of described L-type quartz arm contacts with the tube wall of described test lead quartz ampoule, and leaves gap.
A detection method for the sniffer of above-mentioned liquid level and liquid capacity, it comprises the following steps: 1) demarcate the outer arm of quartz and open type quartz level sensor, and the parameter of demarcation pre-deposited in micro-pressure-difference measurement and control circuit; Wherein, demarcating the outer arm of quartz and open type quartz level sensor is that coefficient in the relational expression of open type quartz level sensor inner air pressure and the outer arm inner air pressure difference of quartz and liquid level is demarcated, the relational expression of pressure difference value and liquid level is: H=a Δ P+b, in formula, H is liquid level, Δ P is the pressure of air in open type quartz level sensor and the difference of the outer arm inner air pressure of quartz, and a, b are the normal parameter obtained after demarcating; 2) to be measured by micro-pressure-difference and control circuit controls the unidirectional micro pump work of influent, testing liquid flows in the outer arm of quartz by L-type quartz arm, measured by micro-pressure-difference and control circuit gather open type quartz level sensor in pressure signal, and calculate tested liquid level by the pressure difference value be preset in micro-pressure-difference measurement and control circuit and liquid level relational expression, and obtain liquid weight by fluid density calculating, and externally display device exports test value; 3) after completing this detection, to be measured by micro-pressure-difference and control circuit controls to discharge the unidirectional micro pump work of liquid, the liquid in outer for quartz arm is discharged.
The present invention is owing to taking above technical scheme, and it has the following advantages: 1, the present invention changes according to faint pressure owing to adopting, and measure the change of liquid level, pressure is by transfer of air, and therefore, liquid that the present invention surveys directly does not contact with detection source.2, the present invention is owing to adopting the pressure directly measured in quartzy level sensor, like this when liquid level have fluctuation, steadily time, measure still very stable, and existing optical method and the electric method measuring error when liquid fluctuating is all larger.3, the present invention is according to micro-pressure-difference principle, corresponding detector has been invented for unlimited system and closed system, be mainly used in that non-conductive, liquid fluctuating is large, the special occasions such as secondary reaction occur after liquid and light source/electrical power contacts, the method is simple, highly sensitive, favorable reproducibility, unlimited system and the closed system level sensor volume of invention are little, be convenient to install, practical.4, the present invention adopts open type quartz level sensor and closed quartzy level sensor respectively for open environment and enclosed environment. and open type quartz level sensor is applicable to the detection of liquid level under Large Copacity, large liquid level environment; Closed quartzy level sensor is applicable to the detection of liquid level and liquid capacity under closed system, little liquid level area environment.5, the present invention is owing to adopting 45 ° of angles of chamfer in the collection terminal quartz ampoule bottom of open type quartz level sensor, and while guaranteeing that open type quartz level sensor diameter is little, bottom can not being sealed by liquid film because of surface tension of liquid.6, the present invention adopts 45 ° of angles of chamfer due to the L-type quartz branch outlet end in closed quartzy level sensor, can go downstream along open type quartz level sensor tube wall when environmental liquids can be made like this to enter closed quartzy level sensor, avoid the low loss caused of drop and the shake reducing liquid level.7, open type of the present invention quartz level sensor and closed quartzy level sensor is applied widely, by changing the height of open type quartz level sensor, can be applied to the measurement of differing heights liquid level.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention adopts open type quartz level sensor;
Fig. 2 be the present invention adopt open type quartz level sensor time detection process schematic diagram, acquisition mode when wherein Fig. 2 (a) is zero liquid level, acquisition mode when Fig. 2 (b) is high liquid level (HLL), acquisition mode when Fig. 2 (c) is low liquid level;
Fig. 3 is the structural representation that the present invention adopts closed quartzy level sensor;
Fig. 4 is the detection process schematic diagram of the present invention when adopting closed quartzy level sensor, wherein Fig. 4 (a) is the state not having liquid in closed quartzy level sensor, i.e. virgin state, Fig. 4 (b) is the acquisition mode after injecting liquid in closed quartzy level sensor.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Embodiment one:
As shown in Figure 1, the diaphragm 2 and the micro-pressure-difference that the present invention includes open type quartz level sensor 1, permeable watertight are measured and control circuit 3, and wherein open type quartz level sensor 1 is made up of integrated collection terminal quartz ampoule 4 and test lead quartz ampoule 5.The collection terminal quartz ampoule 4 of open type quartz level sensor 1 is for gathering fluid to be measured information (comprising liquid level or liquid capacity), test lead quartz ampoule 5 to be measured with micro-pressure-difference by diaphragm 2 and control circuit 3 is electrically connected, to be measured by micro-pressure-difference and control circuit 3 gathers change value of pressure in open type quartz level sensor 1, and then complete the detection to height of liquid level inside container.The present invention adopts test lead quartz ampoule 5 to be electrically connected micro-pressure-difference through diaphragm 2 and measures and control circuit 3, burn micro-pressure-difference when can effectively prevent open type quartz level sensor 1 liquid too much to measure and control circuit 3, do not affect the pressure in open type quartz level sensor 1 simultaneously.
In above-described embodiment, collection terminal quartz ampoule 4 bottom of open type quartz level sensor 1 is set to an inclined-plane 6, and the inclined-plane optimum incline angle that the present invention adopts is 45 °.
In the various embodiments described above, micro-pressure-difference is measured and control circuit 3 comprises micro-pressure sensor, processing of signal sources circuit 32, data store change-over circuit 33 and LCDs 34, the open type collected quartz level sensor 1 internal pressure differences original signal transfers in processing of signal sources circuit 32 by micro-pressure sensor 31, the process such as amplification are carried out to the pressure differential original signal received and obtains pressure differential measuring-signal, and by processing of signal sources circuit 32, pressure differential measuring-signal is transferred in data storage change-over circuit 33, realize the storage to pressure differential measuring-signal, conversion process.Data store change-over circuit 33 also connecting fluid crystal display screen 34, and data store change-over circuit 33 and LCDs 34 carries out information interaction, realize the functions such as the real-time display of liquid level/liquid capacity, underlying parameter input, the inquiry of historical data.
In the various embodiments described above, open type quartz level sensor 1 adopts cylindrical structural, and the diameter of its collection terminal quartz ampoule 4 is much larger than the diameter of test lead quartz ampoule 5.
Detecting liquid level method of the present invention is based on above-mentioned liquid detection device, it utilizes level change can cause the air pressure of fluid-tight in open type quartz level sensor 1 that faint change occurs, there is certain linear relationship between the two in liquid level and air pressure variations value, Quantitative equation is set up by between liquid level and this change value of pressure, by the pressure change in Measurement accuracy open type quartz level sensor 1, liquid level at that time just can be obtained.Detecting liquid level method of the present invention comprises the following steps:
1) open type quartz level sensor 1 is demarcated, and the parameter of demarcation is pre-deposited in micro-pressure-difference measurement and control circuit 3;
Wherein, to open type quartz level sensor 1 demarcate be to open type quartz level sensor 1 inner air pressure and external atmospheric pressure difference and liquid level relational expression in coefficient demarcate, the relational expression of liquid level H and pressure difference value is:
ΔH＝aΔP+b
H＝H
0+ΔH
In formula, Δ H is liquid level changing value, and Δ P is the pressure of air and the difference of external atmospheric pressure in open type quartz level sensor 1, H
0for liquid level when original liquid level or zero pressure difference, be constant, a, b are the normal parameter obtained after demarcating open type quartz level sensor 1.
2) measured by micro-pressure-difference and control circuit 3 gather open type quartz level sensor 1 in differential pressure signal, and calculate tested liquid level by the pressure difference value be preset in micro-pressure-difference measurement and control circuit 3 and liquid level relational expression, and externally display device exports test value, completes detection.
In sum, as shown in Figure 2, the present invention is in detection process, and when zero liquid level, the pressure reduction being enclosed in air and the ambient atmosphere in open type quartz level sensor 1 is 0, and it is original liquid level, i.e. H that now micro-pressure-difference measurement and control circuit 3 export numerical value
0(as Suo Shi Fig. 2 (a)).When high liquid level (HLL), be enclosed in open type quartz level sensor 1 in air pressure higher than the pressure of ambient atmosphere, measured by micro-pressure-difference and control circuit 3 measure obtain this pressure difference value, calculate liquid level H by initial calibration coefficient
0+ H (as Suo Shi Fig. 2 (b)).When low liquid level, be enclosed in open type quartz level sensor 1 in air pressure lower than the pressure of ambient atmosphere, measured by micro-pressure-difference and control circuit 3 measure obtain this pressure reduction, calculate liquid level H by initial calibration coefficient
0-H (as Suo Shi Fig. 2 (c)).
Embodiment two:
As shown in Figure 3, diaphragm 2, micro-pressure-difference that the present invention includes closed quartzy level sensor 7, permeable watertight is measured and control circuit 3 and two unidirectional micro pumps 8.Closed quartzy level sensor 7 top to be measured with micro-pressure-difference by diaphragm 2 and control circuit 3 is electrically connected, and is measured and control circuit 3 gathers change value of pressure in open type quartz level sensor 1 by micro-pressure-difference, and then completes the detection to liquid in container weight.Closed quartzy level sensor 7 top also connects a unidirectional micro pump 8 by pipeline, for fluid to be measured being inputted in closed quartzy level sensor 7, closed quartzy level sensor 1 bottom connects another unidirectional micro pump 8 by pipeline, with with the liquid after testing is discharged the unidirectional micro pump 8 of closed quartzy level sensor 7, two and to measure by micro-pressure-difference and control circuit 3 controls work.
In above-described embodiment, closed quartzy level sensor 7 is made up of integrated open type quartz level sensor 1, the outer arm 9 of quartz, L-type quartz arm 10 and straight quartzy arm 11, in the present embodiment, the structure of open type quartz level sensor 1 is identical with the structure of the open type quartz level sensor 1 in embodiment one, does not repeat them here.It is outside that the outer arm 9 of quartz is set in open type quartz level sensor 1, and test lead quartz ampoule 5 outer wall of the top of the outer arm 9 of quartz and open type quartz level sensor 1 links into an integrated entity, and test lead quartz ampoule 5 measures with micro-pressure-difference and control circuit 3 is electrically connected.Outer arm 9 top of quartz is provided with L-type integrated with it quartz arm 10 and straight quartzy arm 11, and L-type quartz arm 10 and straight quartzy arm 11 lay respectively at test lead quartz ampoule 5 side; L-type quartz arm 10 entrance point connects the unidirectional micro pump 8 of influent, and straight quartzy arm 11 is for by outer for quartz arm 9 inner air and turned on outside.The bottom of the outer arm 9 of quartz connects another unidirectional micro pump 8 of discharging liquid by pipeline.
In above-described embodiment, micro-pressure-difference measures and control circuit 3 structure, principle measures with micro-pressure-difference in embodiment one and control circuit structure, principle are identical, does not repeat them here.
In the various embodiments described above, the bottom of the outer arm 9 of quartz adopts funnel type structure 12, and funnel type structure 12 endpiece connects another unidirectional micro pump 8 of discharging liquid by pipeline.
In the various embodiments described above, the endpiece of L-type quartz arm 10 is set to an inclined-plane, and the inclined-plane optimum incline angle that the present invention adopts is 45 °.Wherein, the inclined-plane of L-type quartz arm 10 contacts with the tube wall of test lead quartz ampoule 5, and leaves gap, so that when testing liquid is flowed into by L-type quartz arm 10, can flow down along the outer tube wall of open type quartz level sensor 1.
Detecting liquid level method of the present invention is based on above-mentioned liquid detection device, it utilizes liquid constantly to enter closed quartzy level sensor 7, the pressure differential of air in the quartzy level sensor 1 of air (i.e. external atmospheric pressure) and open type in the outer arm 9 of quartz can be caused to change, there is certain linear relationship between the two in liquid level and pressure differential changing value, Quantitative equation is set up by between liquid level and this change value of pressure, by the pressure change in the closed quartzy level sensor 7 of Measurement accuracy, just can obtain tested liquid level, if know the density of testing liquid, the liquid capacity be input in closed quartzy level sensor 7 can be conversed.Liquid capacity detection method of the present invention comprises the following steps:
1) the outer arm 9 of quartz and open type quartz level sensor 1 are demarcated, and the parameter of demarcation is pre-deposited in micro-pressure-difference measurement and control circuit 3;
Wherein, carrying out demarcation to the outer arm 9 of quartz and open type quartz level sensor 1 is demarcate the coefficient in the relational expression of arm 9 inner air pressure (i.e. external atmospheric pressure) difference and liquid level outside open type quartz level sensor 1 inner air pressure and quartz, and the relational expression of pressure difference value and liquid level is:
In H=a Δ P+b formula, H is liquid level, and Δ P is the pressure of air in open type quartz level sensor 1 and the difference of outer arm 9 inner air pressure of quartz, and a, b are the normal parameter obtained after demarcating.
2) to be measured by micro-pressure-difference and unidirectional micro pump 8 that control circuit 3 controls influent works, testing liquid flows in the outer arm 9 of quartz by L-type quartz arm 10, measured by micro-pressure-difference and control circuit 3 gather open type quartz level sensor 1 in pressure signal, and calculate tested liquid level by the pressure difference value be preset in micro-pressure-difference measurement and control circuit 3 and liquid level relational expression, and obtain liquid weight by fluid density calculating, and externally display device exports test value.
3) after completing this detection, to be measured by micro-pressure-difference and control circuit 3 controls to discharge the unidirectional micro pump 8 of liquid and works, the liquid in outer for quartz arm 9 is discharged.
In sum, as shown in Figure 4, the present invention is in detection process, (the virgin state when not having liquid in closed quartzy level sensor 7, as Suo Shi Fig. 4 (a)), the unidirectional micro pump 8 that micro-pressure-difference measurement and control circuit 3 control influent works, discontinuous liquid to be measured enters the arm 9 of quartz from L-type quartz arm 10 and flows down along open type quartz level sensor 1 outer tube wall, continuous accumulation, the air pressure be enclosed in open type quartz level sensor 1 is higher than the air pressure in the outer arm 9 of quartz, measured by micro-pressure-difference and control circuit 3 measure obtain this pressure reduction, liquid level H is calculated by initial calibration coefficient, because closed quartzy level sensor 7 is closed system, liquid weight can be calculated by fluid density, and measured by micro-pressure-difference and control circuit 3 constantly outwardly display device export liquid level or liquid weight.When fluid to be measured all inputs (as Suo Shi Fig. 4 (b)) in closed quartzy level sensor 7, before upper once testing liquid flows into, micro-pressure-difference is measured and the unidirectional micro pump 8 of control circuit 3 control discharge liquid works, liquid in outer for quartz arm 9 is discharged, when the recovering state in the outer arm 9 of quartz is to virgin state, the unidirectional micro pump 8 that micro-pressure-difference measurement and control circuit 3 control influent works, and starts liquid detection next time.
The various embodiments described above are only for illustration of the present invention; the structure of each parts and connected mode all can change to some extent; on the basis of technical solution of the present invention; all improvement of carrying out the connection of individual part and structure according to the principle of the invention and equivalents, all should not get rid of outside protection scope of the present invention.
Claims (10)
1. the sniffer of a liquid level and liquid capacity, it is characterized in that: it comprises open type quartz level sensor, a diaphragm and a micro-pressure-difference and measures and control circuit, and described open type quartz level sensor is made up of integrated collection terminal quartz ampoule and test lead quartz ampoule; Described collection terminal quartz ampoule is for gathering fluid to be measured information, and described test lead quartz ampoule is measured with described micro-pressure-difference by described diaphragm and control circuit is electrically connected; Described collection terminal quartz ampoule bottom is set to an inclined-plane.
2. the sniffer of a kind of liquid level as claimed in claim 1 and liquid capacity, it is characterized in that: described micro-pressure-difference is measured and control circuit comprises micro-pressure sensor, processing of signal sources circuit, data store change-over circuit and LCDs, the described open type quartz level sensor internal pressure differences original signal collected transfers in described processing of signal sources circuit by described micro-pressure sensor, amplification process is carried out to the pressure differential original signal received and obtains pressure differential measuring-signal, and by described processing of signal sources circuit, pressure differential measuring-signal is transferred in described data storage change-over circuit, described data store change-over circuit and described LCDs carries out information interaction.
3. the sniffer of a kind of liquid level as claimed in claim 1 and liquid capacity, is characterized in that: described inclined-plane optimum incline angle is 45 °.
4. the sniffer of a kind of liquid level as claimed in claim 2 and liquid capacity, is characterized in that: described inclined-plane optimum incline angle is 45 °.
5. the sniffer of a kind of liquid level as claimed in claim 1 or 2 or 3 or 4 and liquid capacity, it is characterized in that: described open type quartz level sensor adopts cylindrical structural, the diameter of described collection terminal quartz ampoule is much larger than the diameter of described test lead quartz ampoule.
6., based on a detection method for the sniffer of liquid level and liquid capacity as described in Claims 1 to 5 any one, it comprises the following steps:
1) open type quartz level sensor is demarcated, and the parameter of demarcation is pre-deposited in micro-pressure-difference measurement and control circuit;
Wherein, to open type quartz level sensor demarcate be to open type quartz level sensor inner air pressure and external atmospheric pressure difference and liquid level relational expression in coefficient demarcate, the relational expression of liquid level H and pressure difference value is:
ΔH＝aΔP+b，
H＝H
0+ΔH，
In formula, Δ H is liquid level changing value, and Δ P is the pressure of air and the difference of external atmospheric pressure in open type quartz level sensor, H
0for liquid level when original liquid level or zero pressure difference, be constant, a, b are the normal parameter obtained after demarcating open type quartz level sensor;
2) measured by micro-pressure-difference and control circuit gather open type quartz level sensor in differential pressure signal, and calculate tested liquid level by the pressure difference value be preset in micro-pressure-difference measurement and control circuit and liquid level relational expression, and externally display device exports test value, completes detection.
7. the sniffer of a kind of liquid level as claimed in any one of claims 1 to 5, wherein and liquid capacity, is characterized in that: it comprises a closed quartzy level sensor, the diaphragm of a permeable watertight, a micro-pressure-difference are measured and control circuit and two unidirectional micro pumps; Described closed quartzy level sensor top is measured with described micro-pressure-difference by described diaphragm and control circuit is electrically connected; Described closed quartzy level sensor top also connects one for the described unidirectional micro pump of influent by pipeline, described closed quartzy level sensor bottom connects another for discharging the described unidirectional micro pump of liquid by pipeline, and unidirectional micro pump described in two is measured and control circuit control work by described micro-pressure-difference;
Described closed quartzy level sensor is made up of integrated described open type quartz level sensor, the outer arm of quartz, L-type quartz arm and straight quartzy arm, it is outside that the outer arm of described quartz is set in described open type quartz level sensor, and the test lead quartz ampoule outer wall of the top of the outer arm of described quartz and described open type quartz level sensor links into an integrated entity, described test lead quartz ampoule measures with described micro-pressure-difference and control circuit is electrically connected; The outer arm top of described quartz is provided with integrated described L-type quartz arm and straight quartzy arm with it, and described L-type quartz arm and straight quartzy arm lay respectively at described test lead quartz ampoule side; Described L-type quartz arm entrance point connects the described unidirectional micro pump of influent, the bottom of the outer arm of described quartz by pipeline connect discharge liquid another described in unidirectional micro pump.
8. the sniffer of a kind of liquid level as claimed in claim 7 and liquid capacity, it is characterized in that: the bottom of the outer arm of described quartz adopts funnel type structure, and described funnel type structure endpiece connects unidirectional micro pump described in another of discharge liquid by pipeline.
9. the sniffer of a kind of liquid level as claimed in claim 7 or 8 and liquid capacity, is characterized in that: the endpiece of described L-type quartz arm is set to an inclined-plane, and described inclined-plane optimum incline angle is 45 °; The inclined-plane of described L-type quartz arm contacts with the tube wall of described test lead quartz ampoule, and leaves gap.
10., based on a detection method for the sniffer of liquid level and liquid capacity as described in claim 7 ~ 9 any one, it comprises the following steps:
1) the outer arm of quartz and open type quartz level sensor are demarcated, and the parameter of demarcation is pre-deposited in micro-pressure-difference measurement and control circuit;
Wherein, demarcating the outer arm of quartz and open type quartz level sensor is that coefficient in the relational expression of open type quartz level sensor inner air pressure and the outer arm inner air pressure difference of quartz and liquid level is demarcated, and the relational expression of pressure difference value and liquid level is:
H＝aΔP+b，
In formula, H is liquid level, and Δ P is the pressure of air in open type quartz level sensor and the difference of the outer arm inner air pressure of quartz, and a, b are the normal parameter obtained after demarcating;
2) to be measured by micro-pressure-difference and control circuit controls the unidirectional micro pump work of influent, testing liquid flows in the outer arm of quartz by L-type quartz arm, measured by micro-pressure-difference and control circuit gather open type quartz level sensor in pressure signal, and calculate tested liquid level by the pressure difference value be preset in micro-pressure-difference measurement and control circuit and liquid level relational expression, and obtain liquid weight by fluid density calculating, and externally display device exports test value;
3) after completing this detection, to be measured by micro-pressure-difference and control circuit controls to discharge the unidirectional micro pump work of liquid, the liquid in outer for quartz arm is discharged.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105758495A (en) * | 2016-03-30 | 2016-07-13 | 连云港大发环保科技有限公司 | Air pressure sensing level gauge and measuring method thereof |
| CN110530455A (en) * | 2019-09-25 | 2019-12-03 | 中国舰船研究设计中心 | A kind of liquid level measuring system and measurement method |
| CN112985506A (en) * | 2021-03-05 | 2021-06-18 | 北京科技大学 | Method for mutual calculation of mud layer height and mud layer pressure of deep cone thickener |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105758495A (en) * | 2016-03-30 | 2016-07-13 | 连云港大发环保科技有限公司 | Air pressure sensing level gauge and measuring method thereof |
| CN110530455A (en) * | 2019-09-25 | 2019-12-03 | 中国舰船研究设计中心 | A kind of liquid level measuring system and measurement method |
| CN112985506A (en) * | 2021-03-05 | 2021-06-18 | 北京科技大学 | Method for mutual calculation of mud layer height and mud layer pressure of deep cone thickener |
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Application publication date: 20150506 |