CN105758495B - A kind of air pressure sensing liquidometer and its measurement method - Google Patents
A kind of air pressure sensing liquidometer and its measurement method Download PDFInfo
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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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Abstract
The present invention is a kind of air pressure sensing liquidometer, comprising: surveys pressure air hose, the upper end for surveying pressure air hose connects pressure guiding pipe；Manometric module, in manometric module measurement pipe gas pressure intensity and in managing gas pressure intensity and submerged depth corresponding relationship；Computing module, the computing module calculate the liquid level numerical value of fluid to be measured；First demarcating module and the second demarcating module, the first demarcating module are used for marked gas pressure, and the second demarcating module is used for marked gas pressure；What is connect with computing module is used to show the display module of numerical value.The invention also discloses the measurement methods of air pressure sensing liquidometer, including system parameter setting, calibration, computing module foundation and level gauging step.The present invention can substantially reduce the sensibility to environment, and when measurement is protected from environmental small, improve measurement accuracy.
Description
Technical field
The invention belongs to liquid measure fields, are related to a kind of liquid level emasuring device and its application method, more particularly to one
Kind air pressure sensing liquidometer and its measurement method.
Background technique
The existing measuring device to the liquid level in container mainly has differential pressure type liquid level meter, and differential pressure type liquid level meter makes
Used time first measures the pressure of container bottom, and the specific gravity inverse using pressure and fluid to be measured goes out liquid level, is equivalent to by right
The pressure signal of container bottom is reprocessed obtains liquid level signal again, or even is directly exactly a pressure gauge scene instruction, pressure
The perception part principal mode of pressure used in differential liquid level gauge has following several:
A) diaphragm type: pressure is surveyed with a hydraulically full membrane cavity, separates pressure measuring chamber and fluid to be measured, what survey pressure was surveyed is film
The pressure of chamber, this requires the liquid thermal expansion coefficient very little in membrane cavity, film itself cannot generate tension or tension it is found that and
Pressure measuring chamber must be with membrane cavity in sustained height, if pressure measuring chamber is higher or lower than membrane cavity, fill liquid can generate static pressure, cause to survey
Deviation is measured, therefore this kind of sensor must be made of one with pressure measuring chamber, extension is signal cable, in complicated building ring
Under border, the stability of sensor is not high, influences the precision of measurement；
B) isobaric leather diaphragm type: lead-out wire including sensor and thereon and the snorkel and flange that are connected with sensor
Disk, sensor structure are a rectangle cavitys, there is sensor outer housing interconnected, bottom plate, auxiliary splint, the sense of sensor two sides
Pressure surface experiences the pressure being tested at liquid level point in tested ullage air pressure and liquid medium by bottom plate, auxiliary splint respectively,
When the pressure of measured medium each leads into the pressure-sensitive face of sensor high and low voltage chamber, the pressure-sensitive face of two sides generates unequal position
It moves, displacement is directly proportional with pressure difference, and by the pressure signal of lead-out wire output measurement on sensor, which proposes sealing performance
Very high requirement is gone out, has been acted upon by temperature changes also very big.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, propose a kind of air pressure sensing liquidometer and its
Measurement method, the air pressure sensing liquidometer and its measurement method can substantially reduce the sensibility to environment, by environment when measurement
Influence it is small, improve measurement accuracy.
The technical problem to be solved by the present invention is to what is be achieved through the following technical solutions.The present invention is a kind of air pressure sensing liquid
Position meter, it is characterized in that, comprising:
Air hose is pressed in survey for being vertically inserted into the fluid to be measured in container, and the upper end of the survey pressure air hose connects
Connect pressure guiding pipe；
The manometric module being connect with the upper end of the pressure guiding pipe, when surveying in pressure air hose lower end insertion fluid to be measured,
Gas pressure intensity and survey pressure air hose in surveying gas pressure intensity in the pipe of pressure air hose described in the manometric module measurement and managing
The corresponding relationship of submerged depth in fluid to be measured；
The computing module that signal input part is connect with the signal output end of the manometric module, the computing module is according to survey
The characterisitic parameter of gas pressure intensity data and survey pressure air hose calculates the liquid level of fluid to be measured in the collected pipe of die block
Numerical value；
The first demarcating module and the second calibration mold that signal output end is connect with the signal input part of the computing module
Block, submerged depth that first demarcating module is used to demarcate survey when air hose being pressed to be in known high liquid level point and corresponding
The gas pressure intensity in pressure air hose is surveyed, when second demarcating module is in known low liquid level point for demarcating survey pressure air hose
Submerged depth and corresponding survey pressure air hose in gas pressure intensity；
What is connect with the computing module is used to show the display module of numerical value.
In a kind of air pressure sensing liquidometer technical solution of the present invention, further preferred technical solution is characterized in: described
It surveys outside pressure air hose and is arranged with casing, the lower end of the casing is close to the lower end of the survey pressure air hose, the set
The liquid level of fluid to be measured is stretched out in the upper end of pipe.
In a kind of air pressure sensing liquidometer technical solution of the present invention, further preferred technical solution is characterized in: described
The bottom for surveying pressure air hose is equipped with air bag, and the port of the air bag is connect with the lower port of the survey pressure air hose.
In a kind of air pressure sensing liquidometer technical solution of the present invention, further preferred technical solution is characterized in: described
The bottom sides of container are circumscribed with the closed container with container composition linker, and the air bag is located at the closed container
It is interior.
The invention also discloses a kind of measurement methods of above-mentioned air pressure sensing liquidometer, it is characterized in that, including it is as follows
The step of:
(a) system parameter of air pressure sensing liquidometer is set: by the sectional area S for surveying pressure air hose and surveying pressure air hose volume
V0Numerical value input data memory module in storage；
(b) demarcating steps: it is respectively H that the lower end of the survey pressure air hose, which is successively directed at known submerged depth,1And H2
High liquid level point and low liquid level point, pipe corresponding when pressure air hose is in two positions is then measured by manometric module
Interior gas pressure intensity P1And P2, then pass through the first demarcating module and the second demarcating module for H1, P1And H2、P2Numerical value input data
Storage in memory module；
(c) liquid level is established by computing module and seeks equation: according to the state equation of perfect gas:
And the parameter characteristic of pressure air hose is surveyed, obtain the equation of the atmospheric pressure surveyed in pressure air hose and liquid level depth:
P0.V0=Pi.Vi=(P0+pi).Vi (1)
Wherein, P0For standard atmospheric pressure, with mmH2O meter；
V0Air hose original volume is pressed to survey, with mmH2O meter,
PiThe air pressure absolute pressure variable in pressure air hose is surveyed when to survey pressure condition, with mmH2O meter,
piThe air pressure in pressure air hose is surveyed when to survey pressure condition with respect to pressure variable, with mmH2O meter,
ViGas volume variable in pressure-measuring pipe when to survey pressure condition, with mm3Meter；
According to the characteristic for surveying pressure air hose, there is Vi=V0Δ H.S=V0-(Hi-pi) .S (2),
Wherein, Δ H is into the depth of water variable in pressure-measuring pipe, with mmH2O meter,
S is the sectional area for surveying pressure air hose, with mm2Meter,
HiTo survey the submerged depth variable for pressing air hose, in terms of mm；
It brings (2) formula into (1) formula, obtains P0.V0=Pi.Vi=(P0+pi).[V0-(Hi-pi) .S)], abbreviation is obtained presses about survey
The submerged depth variable H of air hoseiEquation:
Computing module is by gas pressure intensity P in pipe corresponding to the high liquid level point and low liquid level point in step (b)1And P2Number
Value and submerged depth H1 and H2Numerical value bring formula (3) into, acquire V0And P0Value VcAnd Pc；
By V0And p0Substitution (3) formula, can obtain:
(d) level gauging step: the bottom surface of the bottom end contact of the survey pressure air hose container is pressed by surveying
Gas pressure intensity p in the pipe in pressure air hose is surveyed in module measurementiNumerical value, then pass through computing module for piNumerical value inputs formula (4) and calculates
H outiValue, the HiValue is exactly the liquid level of fluid to be measured in container.
Compared with prior art, the present invention has the following technical effect that: the present invention by survey pressure air hose, pressure guiding pipe,
Manometric module, computing module, the first demarcating module, the second demarcating module and display module are organically combined and constitute one
Kind air pressure sensing liquidometer, due to using above-mentioned structure, the electronic module of apparatus of the present invention such as manometric module and calculating mould
Block is isolated with fluid to be measured, the level detection component as liquid buoyancy sensor to the property of environment and fluid to be measured not
Sensitivity, be protected from environmental it is small, guarantee measurement accuracy, but also have it is cheap, it is adaptable, it is easy to maintain the advantages that,
It is particularly suitable for the liquid level inspection of corrosive liquids, high-temp liquid, the aqueous chemical raw material storage tanks such as sewage, acid-alkali salt strong oxidizing property etc.
It surveys.
Detailed description of the invention
Fig. 1 is the embodiment of the present invention structural schematic diagram；
Fig. 2 is 2 structural schematic diagram of the embodiment of the present invention；
Fig. 3 is 4 structural schematic diagram of the embodiment of the present invention.
Specific embodiment
Referring to the drawings, further describe the specific technical solution of the present invention, in order to those skilled in the art into
Understand the present invention to one step, the limitation without constituting its power.
Embodiment 1, referring to Fig.1-3, a kind of air pressure sensing liquidometer, comprising:
Air hose 3 is pressed in survey in fluid to be measured 2 for being vertically inserted into container 1, and the shape of pressure-measuring pipe is preferably regular,
The partial cross section product that liquid enters cannot change, and otherwise can generate measured deviation, and the upper end connection of the survey pressure air hose is drawn
Pressure pipe 31；
The manometric module 57 connecting with the upper end of the pressure guiding pipe 31 is inserted into fluid to be measured 2 when surveying pressure air hose lower end
When interior, the manometric module 57 measures gas pressure intensity in the pipe of the survey pressure air hose and manages interior gas pressure intensity and the survey pressure
The corresponding relationship of submerged depth of the air hose in fluid to be measured, manometric module 57 use the gas pressure of model XGZP6847
Transmitter module；
The computing module 54 that signal input part is connect with the signal output end of the manometric module, the computing module 54
The liquid of fluid to be measured is calculated according to gas pressure intensity data in the collected pipe of manometric module 57 and the characterisitic parameter for surveying pressure air hose
Position height number, computing module 54 use model CC2530 chip；
The first demarcating module 51 and the second mark that signal output end is connect with the signal input part of the computing module 54
Cover half block 52, submerged depth that first demarcating module 54 is used to demarcate survey when air hose being pressed to be in known high liquid level point and
Gas pressure intensity in corresponding survey pressure air hose, second demarcating module 52 are in known for demarcating survey pressure air hose
The gas pressure intensity in submerged depth and corresponding survey pressure air hose when low liquid level point, computing module 54 can be with wireless transmission
Module 56 connects, and the result that computing module 54 is calculated is by being wirelessly transmitted to client terminal；
What is connect with the computing module 54 is used to show the display module 5 of numerical value.Display module can use display screen
5。
The container 1 can be such as corrosive liquids, high-temp liquid, aqueous chemical raw material storage tank.
Embodiment 2, as shown in Fig. 2, air hose 3 is pressed in the survey in a kind of air pressure sensing liquidometer described in embodiment 1
Outside is arranged with casing 32, the lower end of the casing 32 close to the lower end of the survey pressure air hose, the casing it is upper
The liquid level of fluid to be measured 2 is stretched out at end.By the way that protective jacket is arranged, it can prevent from surveying and press air hose 3 in liquid level change procedure or water
Stream impact is lower there is a situation where toppling, tilting, drift about, and the factor that measurement result has an adverse effect may be proposed by eliminating these
High measurement accuracy.
Embodiment 3, as shown in Fig. 2, air hose is pressed in the survey in a kind of air pressure sensing liquidometer described in embodiment 1
Bottom be equipped with air bag 6, the port of the air bag presses the lower port of air hose 3 to connect with described survey.
Embodiment 4, as shown in figure 3, in a kind of air pressure sensing liquidometer described in embodiment 1, the bottom of the container 1
Side is circumscribed with the closed container 7 with container composition linker, and the air bag 6 is located in the closed container 7.
The invention also discloses the measurement methods of the air pressure sensing liquidometer of above-described embodiment, comprise the following steps that
(a) system parameter of air pressure sensing liquidometer is set: by the sectional area S for surveying pressure air hose and surveying pressure air hose volume
V0Numerical value input data memory module in storage；
(b) demarcating steps: first selecting submerged depth is respectively H1 and H2High liquid level point and low liquid level point, measure H1 and H2
Numerical value, the lower end of the described survey pressure air hose is successively then directed at the high liquid level point and low liquid level point, then by surveying pressure
Gas pressure intensity P in the pipe that pressure air hose is in corresponding when two positions is surveyed in module measurement1And P2, then pass through the first calibration
Module and the second demarcating module are by H1, P1And H2、P2Numerical value input data memory module in storage；
(c) liquid level is established by computing module and seeks equation: according to the state equation of perfect gas:
And the parameter characteristic of pressure air hose is surveyed, obtain the equation of the atmospheric pressure surveyed in pressure air hose and liquid level depth:
P0.V0=Pi.Vi=(P0+pi).Vi (1)
Wherein, P0For standard atmospheric pressure, with mmH2O meter；
V0Air hose original volume is pressed to survey, with mmH2O meter,
PiThe air pressure absolute pressure variable in pressure air hose is surveyed when to survey pressure condition, with mmH2O meter,
piThe air pressure in pressure air hose is surveyed when to survey pressure condition with respect to pressure variable, with mmH2O meter,
ViGas volume variable in pressure-measuring pipe when surveying pressure condition, with mm3Meter；
According to the characteristic for surveying pressure air hose, there is Vi=V0Δ H.S=V0-(Hi-pi) .S (2),
Wherein, Δ H is into the depth of water variable in pressure-measuring pipe, with mmH2O meter,
S is the sectional area for surveying pressure air hose, with mm2Meter,
HiTo survey the submerged depth variable for pressing air hose, in terms of mm；
It brings (2) formula into (1) formula, obtains P0.V0=Pi.Vi=(P0+pi).[V0-(Hi-pi) .S)], abbreviation is obtained presses about survey
The submerged depth variable H of air hoseiEquation:
Computing module is by gas pressure intensity P in pipe corresponding to the high liquid level point and low liquid level point in step (b)1And P2Number
Value and submerged depth H1 and H2Numerical value bring formula (3) into, acquire V0And P0Value VcAnd Pc；
By V0And p0Substitution (3) formula, can obtain:
(d) level gauging step: the bottom surface of the bottom end contact of the survey pressure air hose container is pressed by surveying
Gas pressure intensity p in the pipe in pressure air hose is surveyed in module measurementiNumerical value, then pass through computing module for piNumerical value inputs formula (4) and calculates
H outiValue, the HiValue is exactly the liquid level of fluid to be measured in container.
It can choose any liquid level in demarcating steps to be demarcated, but proving operation is, it is specified that scale liquid position for convenience
H1=1000mmH2O, H2=500mmH2O (can certainly use other values.The biggish value of calibration standard depth selection is can
To expand measurement range, but many difficulties can be encountered on proving operation, generally the smallest load cell is 10kPa,
Select h=1000mm that can meet general conditions well).
The length and diameter of level detection stick can select according to actual needs in the above embodiments, air pressure of the invention
Transmitter liquid level meter further includes that demarcating module such as demarcates button；Output module: including the wireless biography for sending digital liquid level signal
Defeated module 56, liquid-level switch amount output end 55；Power supply module 53, protection shell, mounting fixing parts and mark: CCC, LOGO, type
Number and two dimensional code.
Liquidometer measurement is numerical value, the only on-off model that liquid-level switch provides, in nearly all situation, liquid
Position meter can replace liquid-level switch to work.But with liquidometer replace liquid-level switch be it is uneconomic, it is needed numerical value conversion
For switching value.If the direct liquid feeding bit switch amount output end 55 of intelligent air pressure sensing liquidometer can be increased many fields
The application of conjunction.Generally, liquid-level switch has HH, H, M, L, LL five, can only generally be had using other liquid-level switches 2 position H,
L just needs to install more liquid-level switches if necessary to more multidigit.The liquid-level switch of multidigit output also has, but generally can be more expensive.
If the direct liquid feeding bit switch amount of intelligent air pressure sensing liquidometer exported, be in general it is fairly simple, do not increase more
Few cost.
Claims (4)
1. a kind of air pressure sensing liquidometer characterized by comprising
Air hose is pressed in survey for being vertically inserted into the fluid to be measured in container, and the upper end connection of the survey pressure air hose is drawn
Pressure pipe；
The manometric module being connect with the upper end of the pressure guiding pipe, it is described when surveying in pressure air hose lower end insertion fluid to be measured
The manometric module measurement survey pressure air hose pipe in gas pressure intensity and in managing gas pressure intensity and survey pressure air hose in quilt
Survey the corresponding relationship of the submerged depth in liquid;
The computing module that signal input part is connect with the signal output end of the manometric module, the computing module is according to survey pressing mold
The characterisitic parameter of gas pressure intensity data and survey pressure air hose calculates the liquid level numerical value of fluid to be measured in the collected pipe of block；
The first demarcating module and the second demarcating module that signal output end is connect with the signal input part of the computing module, institute
The first demarcating module stated, which is used to demarcate to survey, presses air hose to be in submerged depth and corresponding survey pressure when oneself knows high liquid level point
Gas pressure intensity in the pipe of air hose, second demarcating module, which is used to demarcate to survey, presses air hose to be in when oneself knows low liquid level point
Gas pressure intensity in the pipe of submerged depth and corresponding survey pressure air hose;
What is connect with the computing module is used to show the display module of numerical value；
It is comprised the following steps that using the method that air pressure sensing liquidometer measures
(a) system parameter of air pressure sensing liquidometer is set: by the sectional area S for surveying pressure air hose and surveying pressure air hose volume Vo's
Storage in numerical value input data memory module;
(b) demarcating steps: the high liquid level point and low liquid level point that submerged depth is respectively H1 and H2 are first selected, H1 and H2 is measured
Numerical value, the lower end of the described survey pressure air hose is successively then directed at the high liquid level point and low liquid level point, then by surveying pressure
Gas pressure intensity P1 and P2 in the pipe that pressure air hose is in corresponding when two positions are surveyed in module measurement, then pass through the first mark
Cover half block and the second demarcating module by H1, P1 and H2, P2 numerical value input data memory module in store;
(c) liquid level is established by computing module and seeks equation: according to the state equation of perfect gas:And survey pressure
The parameter characteristic of air hose obtains the equation of the atmospheric pressure surveyed in pressure air hose and liquid level depth:
Wherein, P0 is standard atmospheric pressure, with mmH2O meter;
V0 is to survey pressure air hose original volume, with mmH2O meter,
Pi is the air pressure absolute pressure variable surveyed in pressure air hose when surveying pressure condition, with mmH2O meter,
pI is to survey to press the air pressure in air hose with respect to pressure variable when surveying pressure condition, with mmH2O meter,
Gas volume variable in pressure-measuring pipe when Vi is survey pressure condition, with mm3Meter;
According to the characteristic for surveying pressure air hose, have
Wherein, Δ H is into the depth of water variable in pressure-measuring pipe, with mmH2O meter,
S is the sectional area for surveying pressure air hose, with mm2Meter,
Hi is the submerged depth variable for surveying pressure air hose, in terms of mm;
It brings (2) formula into (1) formula, obtains
Abbreviation obtains the equation about the submerged depth variable Hi for surveying pressure air hose:
Computing module by the numerical value of gas pressure intensity P1 and P2 in pipe corresponding to the high liquid level point and low liquid level point in step (b) and
The numerical value of submerged depth H1 and H2 bring formula (3) into, acquire the value Vc and Pc of V0 and P0;
By substitution (3) formula of V0 and P0, can obtain:
(d) level gauging step: by the bottom surface of the bottom end contact of the survey pressure air hose container, by surveying pressing mold
Gas pressure intensity pi numerical value in the pipe in pressure air hose is surveyed in block measurement, then is calculated pi numerical value input formula (4) by computing module
Hi value out, the Hi value are exactly the liquid level of fluid to be measured in container.
2. air pressure sensing liquidometer according to claim 1, it is characterised in that: it is arranged with outside the survey pressure air hose
Casing, close to the lower end of the survey pressure air hose, fluid to be measured is stretched out in the upper end of the casing for the lower end of the casing
Liquid level.
3. air pressure sensing liquidometer according to claim 1, it is characterised in that: the bottom of the survey pressure air hose is equipped with
Air bag, the port of the air bag are connect with the lower port of the survey pressure air hose.
4. air pressure sensing liquidometer according to claim 3, it is characterised in that: the bottom sides of the container are circumscribed with
With the closed container of container composition linker, the air bag is located in the closed container.
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| TWI638980B (en) | 2017-08-24 | 2018-10-21 | 中華電信股份有限公司 | Air pressure water level gauge and measuring method thereof |
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| CN109882929B (en) * | 2019-02-15 | 2022-06-07 | 佛山市顺德区美的电子科技有限公司 | Liquid level detection method, liquid level detection device, air conditioner and computer readable storage medium |
| CN109870213B (en) * | 2019-02-15 | 2020-07-03 | 美的集团武汉制冷设备有限公司 | Liquid level detection method, liquid level detection device, air conditioner and computer readable storage medium |
| CN109932019B (en) * | 2019-03-08 | 2020-10-27 | 河海大学 | Liquid level measuring device based on air pressure sensor and liquid level measuring method thereof |
| CN112130594A (en) * | 2019-06-24 | 2020-12-25 | 佛山市顺德区美的饮水机制造有限公司 | Water tank assembly, liquid level control method, water supply device, and computer storage medium |
| CN111896068B (en) * | 2020-07-08 | 2022-09-30 | 惠州拓邦电气技术有限公司 | Method and device for detecting water consumption of equipment and cleaning equipment |
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| CN201434711Y (en) * | 2009-07-02 | 2010-03-31 | 中国水电顾问集团华东勘测设计研究院 | Anti-surge water level measuring device |
| CN204459765U (en) * | 2015-03-03 | 2015-07-08 | 河北中信防腐工程有限公司 | Pressure gas tank superpressure self-alarming device |
| CN205068181U (en) * | 2015-08-04 | 2016-03-02 | 山西晋城无烟煤矿业集团有限责任公司 | Industry liquid -level monitoring device |
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