CN104089680B - The measuring method and device of liquid level height - Google Patents
The measuring method and device of liquid level height Download PDFInfo
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- CN104089680B CN104089680B CN201410361671.0A CN201410361671A CN104089680B CN 104089680 B CN104089680 B CN 104089680B CN 201410361671 A CN201410361671 A CN 201410361671A CN 104089680 B CN104089680 B CN 104089680B
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Abstract
The invention provides a kind of measuring method and device of liquid level height, including：At least two pressure/force sensors are set in the liquid that liquid measure cylinder is held, and the value calculating liquid pressure measured according to sensor is poor；Wherein, the position of two sensors has default difference in height；In liquid measure cylinder, at least two pressure/force sensors are set, and the value calculating gas pressure intensity measured according to sensor is poor outside liquid levels；Wherein, the position of two sensors has default difference in height；According to liquid pressure is poor, the vertical range between gas pressure intensity difference and sensor, the height value of liquid level is calculated；In the present invention using sensor can direct measurement liquids and gases value, it is so that easy to use, and sensor is all its vertical direction measured to gas and liquid, therefore the angle of inclination of the liquid measure cylinder has no effect to the result measured, therefore can effectively reduce the measurement error caused by being tilted when liquid measure cylinder is installed.
Description
Technical field
The present invention relates to level gauging field, in particular to a kind of measuring method and device of liquid level height.
Background technology
The device of traditional measurement liquid level is to use differential pressure type level gauge.Wherein, differential pressure type level gauge is to utilize liquid liquid
Static pressure caused by potential difference changes to measure liquid level.
Specifically, as shown in figure 1, its operation principle is as follows：It is quiet as caused by fluid column when being changed using the liquid level in container
Press the also principle of respective change and work, as shown in Figure 1；Liquid phase, another termination gas phase are terminated by the one of differential pressure transmitter.If
Upper vessel portion space is dry gas, and its pressure is P1, base pressure P+；Then P+=P1+H ρ g；In formula, H is liquid level；
ρ is Media density；G is acceleration of gravity；As available from the above equation:△ P=P+-P1=Hpg；Wherein, the density p of measured medium is
Know, pressure difference △ P are directly proportional to liquid level H, and mechanical or fluid pressure type switching mechanism (pressure gauge etc.) is measured pressure difference and is known that
Tested liquid level.
But traditional differential pressure type level gauge bothers when coming into operation, water must be filled in transmitter pressure guiding pipe or waits water to steam
Airsetting knot could accurately come into operation after being full of pressure guiding pipe, and the limited precision of transmitter measurement differential pressure, along with sampling line
The factor such as unstable of middle fluid column causes the composition error that actually measures larger.
The content of the invention
It is an object of the invention to provide a kind of measuring method and device of liquid level height, to solve above-mentioned ask
Topic.
A kind of measuring method of liquid level height is provided in an embodiment of the present invention, for measuring in liquid measure cylinder
The height value of liquid level；Including：
At least two pressure/force sensors are set in the liquid that liquid measure cylinder is held, and according to pressure/force sensor
It is poor that the pressure/force value measured calculates liquid pressure；Wherein, the position of two pressure/force sensors has default height
Difference；
In liquid measure cylinder, at least two pressure/force sensors are set, and are sensed according to pressure/force outside liquid levels
It is poor that the pressure/force value that device measures calculates gas pressure intensity；Wherein, the position of two pressure/force sensors has default height
Degree is poor；
According to liquid pressure is poor, the vertical range between gas pressure intensity difference and pressure/force sensor, liquid liquid is calculated
The height value of position.
Further, in this method, according to liquid pressure is poor, between gas pressure intensity difference and pressure/force sensor
Vertical range, the height value of liquid level is calculated, including：
It is poor according to liquid pressure, the liquid pressure variable quantity of unit of account height, obtain the first result of calculation；
It is poor according to gas pressure intensity, the gas pressure intensity variable quantity of unit of account height, obtain the second result of calculation；
According to the vertical range between the first result of calculation and the second result of calculation and pressure/force sensor, calculate
The height value of liquid level.
Further, this method also includes：
The height value of each pressure/force sensing station is gathered, and pressure/force is calculated according to the height value of position
Vertical range between sensor；
Further, in this method, the pressure/force value calculating liquid pressure measured according to pressure/force sensor is poor,
Including：
The pressure/force value that pressure/force sensor is sent is received, and it is poor according to pressure/force value calculating liquid pressure
With gas pressure difference.
Further, in this method, after the height value for calculating liquid level, in addition to：
By the height value of liquid level compared with the preset height value that itself is stored；Wherein preset height value includes：
Highest preset value and minimum predetermined value；
When the height value of liquid level exceedes highest preset value, control warning device alarm, and control liquid to flow out valve
Door is opened, to be discharged water for liquid measure cylinder；
When the height value of liquid level is less than minimum predetermined value, control warning device alarm, and control liquid to flow out valve
Door is opened and/or control liquid injection valve door is closed, to be discharged water for liquid measure cylinder.
A kind of measurement apparatus of liquid level height is provided in an embodiment of the present invention, for measuring in liquid measure cylinder
The height value of liquid level；Including：
For holding the liquid measure cylinder of liquid；
The multiple pressure/force sensors being arranged in the liquid that liquid measure cylinder is held；It is arranged in liquid measure cylinder, liquid levels
Outer multiple pressure/force sensors；Wherein, where each two pressure/force sensor in liquid and outside liquid levels
Position is respectively provided with default difference in height；Pressure/force sensor, the pressure of the liquid/gas for measuring present position/
Pressure value；
Pressure/force value for being measured according to pressure/force sensor calculates liquid pressure difference and gas pressure difference, and
According to liquid pressure is poor, the vertical range between gas pressure intensity difference and pressure/force sensor, the height of liquid level is calculated
The harvester of value.
Further, the device also includes：Liquid flows out valve and liquid flows into valve；
Delivery port and water inlet are provided with liquid measure cylinder；Delivery port is connected with liquid outflow valve；Water inlet and liquid
Valve is flowed into be connected；Wherein, water inlet is more than delivery port to the vertical of liquid measure cylinder bottom to the vertical range of liquid measure cylinder bottom
Distance.
Further, the device also includes controller and the warning device being electrically connected with the controller；
Controller, for by the height value of liquid level compared with the preset height value that itself is stored；It is wherein default
Height value includes：Highest preset value and minimum predetermined value；When the height value of liquid level exceedes highest preset value, control alarm
Device is alarmed, and controls institute's liquid outflow valve to open, to be discharged water for liquid measure cylinder；When the height value of liquid level is less than minimum
During preset value, control warning device alarm, and control institute liquid to flow into valve and open, to for liquid measure cylinder water storage.
Further, in the device, a pressure/force sensor is provided with liquid measure cylinder, above delivery port；Liquid measure
In cylinder, a pressure/force sensor is provided with above water inlet；
The top of liquid measure cylinder is provided with opening；In liquid measure cylinder, the position of opening is provided with a pressure/force sensing
Device；In liquid measure cylinder, a pressure/force sensor is provided with above liquid level.
Further, in the device, the default height of two pressure/force sensors in the liquid that liquid measure cylinder is held
The default difference in height of two pressure/force sensors outside difference and liquid levels is the 1/6-1/9 of liquid measure cylinder height；
Two outside the default difference in height and liquid levels of two pressure/force sensors in the liquid that liquid measure cylinder is held
The default difference in height of individual pressure/force sensor is equal in magnitude.
The measuring method and device of a kind of liquid level height provided in an embodiment of the present invention, including：Held in liquid measure cylinder
Liquid at least two pressure/force sensors, and the pressure/force value meter measured according to pressure/force sensor are set
It is poor to calculate liquid pressure；Wherein, the position of two pressure/force sensors has default difference in height；In liquid measure cylinder, liquid liquid
At least two pressure/force sensors are set outside face, and the pressure/force value measured according to pressure/force sensor calculates gas
Body pressure difference；Wherein, the position of two pressure/force sensors has default difference in height；According to liquid pressure is poor, gas pressure
Vertical range between strong poor and pressure/force sensor, calculate the height value of liquid level, compared with prior art in biography
The differential pressure type level gauge of system is bothered when coming into operation, and water must be filled in transmitter pressure guiding pipe or waits Water vapor condensation to be full of pressure guiding pipe
After could accurately come into operation, and the limited precision of transmitter measurement differential pressure, along with sampling line fluid column it is unstable etc.
Factor causes the larger scheme of composition error actually measured, can direct measurement liquid using pressure/force sensor in the present invention
With the pressure/force value of gas, without filling water or waiting Water vapor condensation so that using simple, conveniently, and pressure/force
Sensor is all the pressure/force of its vertical direction of measurement to gas and liquid, therefore the angle of inclination of the liquid measure cylinder is to surveying
The result measured has no effect, therefore can effectively reduce the measurement error caused by being tilted when liquid measure cylinder is installed.
Brief description of the drawings
Fig. 1 shows the measurement apparatus for the liquid level that correlation technique provides；
Fig. 2 shows a kind of front view of the measurement apparatus of liquid level provided in an embodiment of the present invention；
Fig. 3 shows a kind of structural representation of the measurement apparatus of liquid level provided in an embodiment of the present invention.
Embodiment
The present invention is described in further detail below by specific examples of the implementation and with reference to accompanying drawing.
The embodiments of the invention provide a kind of measuring method of liquid level height, for measuring the liquid in liquid measure cylinder 101
The height value of position；Including：
At least two pressure/force sensors 102 are set in the liquid that liquid measure cylinder 101 is held, and according to pressure/force
It is poor that the pressure/force value that sensor 102 measures calculates liquid pressure；Wherein, the position tool of two pressure/force sensors 102
There is default difference in height；
In liquid measure cylinder 101, at least two pressure/force sensors 102 are set outside liquid levels, and according to pressure/pressure
It is poor that the pressure/force value that force snesor 102 measures calculates gas pressure intensity；Wherein, the position of two pressure/force sensors 102
With default difference in height；
According to liquid pressure is poor, the vertical range between gas pressure intensity difference and pressure/force sensor 102, liquid is calculated
The height value of body fluid position.
A kind of measuring method of liquid level height provided in an embodiment of the present invention, including：In the liquid that liquid measure cylinder 101 is held
At least two pressure/force sensors 102, and the pressure/force value measured according to pressure/force sensor 102 are set in vivo
It is poor to calculate liquid pressure；Wherein, the position of two pressure/force sensors 102 has default difference in height；In liquid measure cylinder 101
It is interior, at least two pressure/force sensors 102, and the pressure measured according to pressure/force sensor 102 are set outside liquid levels
It is poor that by force/pressure value calculates gas pressure intensity；Wherein, the position of two pressure/force sensors 102 has default difference in height；Root
According to liquid pressure is poor, the vertical range between gas pressure intensity difference and pressure/force sensor 102, the height of liquid level is calculated
Angle value, compared with prior art in traditional differential pressure type level gauge bothered when coming into operation, water must be filled in transmitter pressure guiding pipe
Or wait Water vapor condensation accurately to be come into operation after being full of pressure guiding pipe, and the limited precision of transmitter measurement differential pressure, add
The factor such as unstable of fluid column causes the larger scheme of composition error actually measured in sampling line, in the present invention using pressure/
Pressure sensor 102 can direct measurement liquids and gases pressure/force value, without filling water or waiting Water vapor condensation so that
Using simple, conveniently, and pressure/force sensor 102 is all pressure/pressure of its vertical direction of measurement to gas and liquid
Power, therefore the angle of inclination of the liquid measure cylinder 101 has no effect to the result measured, therefore can effectively reduce due to liquid measure
Measurement error caused by being tilted when cylinder 101 is installed.
Specifically, pressure/force sensor 102 is set in the liquid that liquid measure cylinder 101 is held on the position of different height,
It is to measure the liquid pressure value of different height position, it is poor that liquid pressure is then calculated according to the liquid pressure value；Meanwhile
In liquid measure cylinder 101, pressure/force sensor 102 is set, also for the different height of measurement outside liquid levels in different height
The gas pressure intensity value of position is spent, it is then poor according to gas pressure intensity value calculating gas pressure intensity, so as to gentle subsequently according to the liquid
Body pressure difference calculates the height value of the liquid level in liquid measure cylinder 101.Wherein, if liquid measure cylinder 101 is in the state of normal temperature, press
What by force/pressure sensor 102 measured is the pressure values of air (i.e. normal temperature atmospheric pressure), if liquid measure cylinder 101 is in the shape of high temperature
Under state, then what pressure/force sensor 102 measured is the pressure values for the gas that heated liquid volatilization becomes.
In the present embodiment, illustrate：If the pressure transducer used, pressure transducer direct measurement pressure can be used
The liquid of sensor position or the pressure values of gas；If using pressure sensor, pressure sensor place is measured first
The liquid of position or the pressure value of gas, then according to pressure formula P=F/S, calculate pressure values.
In addition, default difference in height described in the present embodiment, is set according to the liquid measure cylinder 101 of different size
, i.e., the liquid measure cylinder 101 of same specification, a corresponding fixed height difference；The height difference is according to constantly experiment time
Numerical value obtained from number, the liquid level height calculated according to the difference in height are the most accurate.
Wherein, default difference in height can corresponding to multigroup position, what specific pressure/force sensor 102 was placed
Position can arbitrarily be set.Every time during measurement, only select one group of defined location, one group of position that then can be in liquid or
One group of position outside person's liquid levels sets one or more pressure/force sensors 102, sets multiple pressure/forces to sense
Device 102, the average value of pressure is measured, can make it that follow-up result of calculation is more accurate.
Further, in this method, according to liquid pressure is poor, between gas pressure intensity difference and pressure/force sensor 102
Vertical range, calculate the height value of liquid level, including：
It is poor according to liquid pressure, the liquid pressure variable quantity of unit of account height, obtain the first result of calculation.
Specifically, the pressure difference of any one group of position in liquid or outside liquid levels and the default height of this group of position
The ratio of degree difference is liquid pressure variable quantity.
It is poor according to gas pressure intensity, the gas pressure intensity variable quantity of unit of account height, obtain the second result of calculation.
Likewise, the pressure difference of any one group of position in gas or outside liquid levels and the default height of this group of position
The ratio of degree difference is gas pressure intensity variable quantity.
According to the vertical range between the first result of calculation and the second result of calculation and pressure/force sensor 102, meter
Calculate the height value of liquid level.
Specifically, the liquid level of liquid level degree of precision is calculated according to principle algorithm and backoff algorithm, the principle algorithm and benefit
Repaying algorithm is：Liquid levels and the height difference of a pressure/force sensor 102 nearest apart from liquid levels are multiplied by unit
The variable quantity of the gas pressure intensity of height, obtain the first pressure difference；Liquid level height value is multiplied by the liquid pressure of unit height
Variable quantity, obtain the second pressure difference；First pressure difference, the second pressure difference with a pressure nearest apart from liquid levels/
Surveyed the gas pressure intensity value of pressure sensor 102 and equal to a pressure/force sensor 102 nearest apart from liquid levels
The liquid pressure value measured.
All it is the given value of measurement in addition to liquid level height value according to above-mentioned principle, therefore can be in terms of beyond all doubt
Calculation obtains liquid level height value (its specific explanations refers to Fig. 2 and the subsequently explanation to Fig. 2).
Further, this method also includes：
Gather the height value of each position of pressure/force sensor 102, and according to the height value of position calculate pressure/
Vertical range between pressure sensor 102.
Specifically, the height value of each position of pressure/force sensor 102 is gathered by harvester 201, and according to this
The height value of position calculates the vertical range between each two pressure/force sensor 102.If liquid level is highly Hx, then
Each pressure/force sensor 102 distance Hx vertical range can also be calculated according to the height value of the position.
Further, in this method, the pressure/force value measured according to pressure/force sensor 102 calculates liquid pressure
Difference, including：
The pressure/force value that pressure/force sensor 102 is sent is received, and liquid pressure is calculated according to pressure/force value
Difference and gas pressure difference.
Specifically, harvester 201 receives the pressure/force value that pressure/force sensor 102 is sent, then according to institute
Pressure/force value is stated, calculates liquid pressure difference and gas pressure difference.
Further, in this method, after the height value for calculating liquid level, in addition to：By the height value of liquid level
Compared with the preset height value of itself storage；Wherein preset height value includes：Highest preset value and minimum predetermined value；Work as liquid
When the height value of body fluid position exceedes highest preset value, control warning device 401 is alarmed, and controls liquid outflow valve 104 to open
And/or control liquid injection valve door 103 is closed, to be discharged water for liquid measure cylinder 101；When the height value of liquid level is less than minimum pre-
If during value (such as 1/20 of liquid measure cylinder height), control warning device 401 is alarmed, and is controlled institute's liquid to flow into valve 103 and is opened,
To for the water storage of liquid measure cylinder 101.
Control liquid outflow valve 104 opens and/or controlled liquid injection valve door 103 to close, when under normal rest state
Liquid level when highly exceeding preset value, it is only necessary to control liquid outflow valve 104 to open, to be discharged water for liquid measure cylinder 101；
When make it that liquid level has exceeded preset value during for the water storage of liquid measure cylinder 101, then in control liquid outflow valve 104
While opening, closing liquid is also wanted to flow into valve 103.
Wherein, highest preset value is depended primarily in liquid measure cylinder, and the nearest distance of the liquid levels external distance chaotropic body page is (such as
Sensor C position in Fig. 2), the eternal position no more than sensor C of height of liquid level, once because liquid level exceedes
Sensor C, sensor C and D just can not measure the pressure difference of gas (vapour) body, and the height Hx errors now measured will be very big, very
To being wrong.Therefore, highest preset value is generally the height of sensor C points and subtracts d (d >=20cm, liquid measure cylinder is longer, and d is got over
Greatly).
Specifically, controller 301 itself prestores liquid level preset height value in liquid measure cylinder 101, the preset height value is same
It is to be set according to the liquid measure cylinder 101 of different size；Specifically, the corresponding different liquid level of the liquid measure cylinder 101 of same specification is pre-
If height value.The concrete numerical value of liquid level preset height value can be configured according to user's request.
The embodiment of the present invention additionally provides a kind of measurement apparatus of liquid level height, for measuring in liquid measure cylinder 101
The height value of liquid level；As shown in figure 3, including：For holding the liquid measure cylinder 101 of liquid；It is arranged on the liquid that liquid measure cylinder 101 is held
Interior multiple pressure/force sensors 102；It is arranged in liquid measure cylinder 101, multiple pressure/force sensors outside liquid levels
102；Wherein, the position where each two pressure/force sensor 102 in liquid and outside liquid levels is respectively provided with default height
Degree is poor；Pressure/force sensor 102, the pressure/force value of the liquid/gas for measuring present position.
Pressure/force value for being measured according to pressure/force sensor 102 calculates liquid pressure difference and gas pressure intensity
Difference, and according to liquid pressure is poor, the vertical range between gas pressure intensity difference and pressure/force sensor 102, calculate liquid liquid
The harvester 201 of the height value of position.
A kind of measurement apparatus of liquid level height provided in an embodiment of the present invention, including：In the liquid that liquid measure cylinder 101 is held
At least two pressure/force sensors 102, and the pressure/force value measured according to pressure/force sensor 102 are set in vivo
It is poor to calculate liquid pressure；Wherein, the position of two pressure/force sensors 102 has default difference in height；In liquid measure cylinder 101
It is interior, at least two pressure/force sensors 102, and the pressure measured according to pressure/force sensor 102 are set outside liquid levels
It is poor that by force/pressure value calculates gas pressure intensity；Wherein, the position of two pressure/force sensors 102 has default difference in height；Root
According to liquid pressure is poor, the vertical range between gas pressure intensity difference and pressure/force sensor 102, the height of liquid level is calculated
Angle value compared with prior art in traditional differential pressure type level gauge bothered when coming into operation, must be filled in transmitter pressure guiding pipe water or
Could accurately it be come into operation after being full of pressure guiding pipe Deng Water vapor condensation, and the limited precision of transmitter measurement differential pressure, along with taking
The factor such as unstable of fluid column causes the larger scheme of composition error actually measured in sample pipeline, and pressure/pressure is used in the present invention
Force snesor 102 can direct measurement liquids and gases pressure/force value, without filling water or waiting Water vapor condensation so that make
With simple, conveniently, and pressure/force sensor 102 is all pressure/pressure of its vertical direction of measurement to gas and liquid
Power, therefore the angle of inclination of the liquid measure cylinder 101 has no effect to the result measured, therefore can effectively reduce due to liquid measure
Measurement error caused by being tilted when cylinder 101 is installed.
Further, as shown in Fig. 2 the device also includes：Liquid flows out valve 104 and liquid flows into valve 103；
Delivery port and water inlet are provided with liquid measure cylinder 101；Delivery port is connected with liquid outflow valve 104；Water inlet
Valve 103 is flowed into liquid to be connected；Wherein, water inlet is more than delivery port to liquid measure to the vertical range of the bottom of liquid measure cylinder 101
The vertical range of 101 bottoms of cylinder.
Specifically, setting delivery port and water inlet on liquid measure cylinder 101, and correspond to respectively and liquid outflow valve 104 and liquid
Body flows into valve 103 and is connected, in order to controls the liquid level of the liquid in liquid measure cylinder 101, makes the liquid level of liquid high
Degree should not be too high or too low.
Further, as shown in figure 3, the device also includes controller 301 and the warning device electrically connected with controller 301
401；
Controller 301, for by the height value of liquid level compared with the preset height value that itself is stored；It is wherein pre-
If height value includes：Highest preset value and minimum predetermined value；When the height value of liquid level exceedes highest preset value, control report
Alarm device 401 is alarmed, and controls institute's liquid outflow valve 104 to open, to be discharged water for liquid measure cylinder 101；When the height of liquid level
When angle value is less than minimum predetermined value, control warning device 401 is alarmed, and is controlled institute liquid to flow into valve 103 and opened, to for liquid
The water storage of graduated cylinder 101.
Further, as shown in Fig. 2 in the device, a pressure/pressure is provided with liquid measure cylinder 101, above delivery port
Force snesor 102；A pressure/force sensor 102 is provided with liquid measure cylinder 101, above water inlet；
The top of liquid measure cylinder 101 is provided with opening；In liquid measure cylinder 101, the position of opening is provided with a pressure/pressure
Force snesor 102；In liquid measure cylinder 101, a pressure/force sensor 102 is provided with above liquid level.
Specifically, two pressure/force sensors 102 in the liquid of liquid measure cylinder 101 are separately positioned on the upper of delivery port
Side and the top of water inlet, the convenient setting to pressure/force sensor 102, and avoid water inlet and water outlet stream
Dynamic liquid has an impact to the pressure/force value that pressure/force sensor 102 measures.
Further, as shown in Fig. 2 in the device, two pressure/forces sensing in the liquid that liquid measure cylinder 101 is held
The default difference in height of two pressure/force sensors 102 outside the default difference in height and liquid levels of device 102 is liquid measure
The 1/6-1/9 of 101 height of cylinder；
The default difference in height and liquid levels of two pressure/force sensors 102 in the liquid that liquid measure cylinder 101 is held
The default difference in height of two outer pressure/force sensors 102 is equal in magnitude.
A kind of measurement apparatus of liquid level height provided by the invention is illustrated with reference to Fig. 2：
As shown in Fig. 2 it is A points, water inlet to set the position above delivery port where pressure/force sensor 102 respectively
Top pressure/force sensor 102 where position be B；The vertical range of A points and B points is H2；It is arranged close to be open respectively
Pressure/force sensor 102 where position be D points, where the pressure/force sensor of the top of liquid level 102
Position is C points；The vertical range of D points and C points is H4.
Wherein, H2 and H4 size is both preferably 1/8 (H2 and H4 equal in magnitude) of the height of liquid measure cylinder 101, and choosing should
Under height, the liquid pressure difference and gas pressure difference that the position where can making pressure/force sensor 102 measures are more accurate.
In measurement process, normal level is between B points and C points, is to be in gaseous state forever between C points and D points；
Specifically, according to formula：DPG=(PC-PD)/H4, the gas pressure intensity variable quantity of unit of account height；
Wherein, dPG is the variable quantity of the gas pressure intensity of unit height；PC is the pressure of the C points measured by pressure transducer；
PD is the pressure of the D points measured by pressure transducer；
According to formula：DPL=(PA-PB)/H2, the liquid pressure variable quantity of unit of account height；
Wherein, dPL is the liquid pressure variable quantity of unit height；PA is the pressure of the A points measured by pressure transducer；PB
For the pressure of the B points measured by pressure transducer.
In the present embodiment, if the liquid level of liquid is Hx, then according to principle algorithm and backoff algorithm calculate liquid level compared with
High-precision liquid level, according to formula PB=PC+ (H3-Hx) * dPG+Hx*dPL, obtain
Wherein, H2 is the vertical range of A points and B points；H3 is the vertical range of B points and C points；H4 is the vertical of C points and D points
Distance；PA, PB, PC and PD are respectively the pressure values of A points, B points, C points and D points.
Specifically, H2, H3 and H4 are known quantities, its value will determine with the determination of pressure sensor installation site；PA、
PB, PC and PD are also given value, and its value is gone out by pressure sensor direct measurement or converted by measured value.Known to as more than
Amount can calculate unknown quantity Hx, therefore actual liquid liquid level height value can be calculated.
The measuring method and device of a kind of liquid level height provided by the invention, can be produced the advantage that：
1st, the measurement error caused by being tilted when liquid measure cylinder 101 is installed can be effectively reduced.Due to either gas
The pressure of pressure or liquid, is all its vertical direction pressure of measurement when measuring it, therefore the inclination angle of the liquid measure cylinder 101
Spend and the result measured is had no effect；
2nd, using harvester 201, pressure/force sensor 102 and liquid measure cylinder 101, cost is cheap and circuit is simple：By
In the fast development of state's external pelivimetry pressure and pressure chip technology, the type chip price is set significantly to decline, in addition, the type
Chip periphery circuit is simple, it is not necessary to and complicated collection change-over circuit and process circuit, therefore, the cost of liquid measure cylinder 101 are cheap,
Circuit is simple.
Obviously, those skilled in the art should be understood that above-mentioned each device of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored
Performed in the storage device by computing device, either they are fabricated to respectively each integrated circuit modules or by they
In multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific
Hardware and software combines.
The preferred embodiments of the present invention are these are only, are not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. measuring method of liquid level height, for measuring the height value of the liquid level in liquid measure cylinder；Characterized in that, bag Include：At least two pressure/force sensors are set in the liquid that the liquid measure cylinder is held, and passed according to the pressure/force It is poor that the pressure/force value that sensor measures calculates liquid pressure；Wherein, the position of two pressure/force sensors has pre- If difference in height；In the liquid measure cylinder, at least two pressure/force sensors are set outside the liquid levels, and according to the pressure/ It is poor that the pressure/force value that pressure sensor measures calculates gas pressure intensity；Wherein, the position of two pressure/force sensors With default difference in height；It is poor, described according to the pressure/force value of two pressure/force sensors measure in the liquid, the liquid pressure Pressure/force value that two pressure/force sensors outside liquid levels measure, the gas pressure intensity be poor and the pressure/ Vertical range between pressure sensor, calculate the height value of liquid level；Wherein, between the pressure/force sensor Vertical range refers to two pressure/forces sensing outside two pressure/force sensors and the liquid levels in the liquid Device position from low to high, the vertical range between adjacent pressure/force sensor two-by-two.
- 2. according to the method for claim 1, it is characterised in that according to two pressure/force sensors in the liquid The pressure that the pressure/force value of measure, the liquid pressure be poor, two pressure/force sensors outside the liquid levels measure By force/pressure value, the gas pressure intensity be poor and the pressure/force sensor between vertical range, calculate liquid level Height value, including：It is poor according to the liquid pressure, the liquid pressure variable quantity of unit of account height, obtain the first result of calculation；It is poor according to the gas pressure intensity, the gas pressure intensity variable quantity of unit of account height, obtain the second result of calculation；According to first result of calculation, second result of calculation, the pressure/force sensor institute nearest apart from liquid levels Liquid pressure value that the gas pressure intensity of survey, the pressure/force sensor nearest apart from liquid levels measure and the pressure/ Vertical range between pressure sensor, calculate the height value of liquid level.
- 3. according to the method for claim 2, it is characterised in that also include：The height value of each pressure/force sensing station is gathered, and according to calculating the height value of the position Vertical range between pressure/force sensor.
- 4. according to the method for claim 3, it is characterised in that the pressure measured according to the pressure/force sensor By force/pressure value calculating liquid pressure is poor, including：The pressure/force value that the pressure/force sensor is sent is received, and the liquid is calculated according to the pressure/force value Body pressure difference.
- 5. according to the method for claim 4, it is characterised in that after the height value for calculating liquid level, in addition to：By the height value of the liquid level compared with the preset height value that itself is stored；Wherein described preset height value bag Include：Highest preset value and minimum predetermined value；When the height value of the liquid level exceedes the highest preset value, control warning device alarm, and control the liquid Body outflow valve is opened and/or control liquid injection valve door is closed, to be discharged water for the liquid measure cylinder；When the height value of the liquid level is less than the minimum predetermined value, the warning device is controlled to alarm, and control institute State liquid and flow into valve and open, to for the liquid measure cylinder water storage.
- A kind of 6. measurement apparatus of liquid level height, for measuring the height value of the liquid level in liquid measure cylinder；Characterized in that, bag Include：For holding the liquid measure cylinder of liquid；The multiple pressure/force sensors being arranged in the liquid that the liquid measure cylinder is held；It is arranged in the liquid measure cylinder, liquid Multiple pressure/force sensors outside liquid level；Wherein, pressure/force described in each two in liquid and outside liquid levels Position where sensor is respectively provided with default difference in height；The pressure/force sensor, for measuring present position The pressure/force value of liquid/gas；Pressure/force value for being measured according to the pressure/force sensor calculates liquid pressure difference and gas pressure difference, and The pressure/force value that is determined according to two pressure/force sensors in the liquid, the liquid pressure are poor, the liquid Pressure/force value that two pressure/force sensors outside liquid level measure, the gas pressure intensity be poor and the pressure/force Vertical range between sensor, calculate the harvester of the height value of liquid level；Wherein, the pressure/force sensor Between vertical range refer to two pressure/pressures outside two pressure/force sensors and the liquid levels in the liquid Force snesor position from low to high, the vertical range between adjacent pressure/force sensor two-by-two.
- 7. device according to claim 6, it is characterised in that also include：Liquid flows out valve and liquid flows into valve；Delivery port and water inlet are provided with the liquid measure cylinder；The delivery port is connected with liquid outflow valve；It is described Water inlet flows into valve with the liquid and is connected；Wherein, the water inlet is more than to the vertical range of the liquid measure cylinder bottom Vertical range of the delivery port to the liquid measure cylinder bottom.
- 8. device according to claim 7, it is characterised in that the report electrically connected also including controller and with the controller Alarm device；The controller, for by the height value of the liquid level compared with the preset height value that itself is stored；Wherein The preset height value includes：Highest preset value and minimum predetermined value；When the height value of the liquid level exceedes the highest During preset value, control the warning device to alarm, and control institute's liquid outflow valve to open, to be discharged water for the liquid measure cylinder； When the height value of the liquid level is less than the minimum predetermined value, the warning device is controlled to alarm, and control institute's liquid Flow into valve to open, to for the liquid measure cylinder water storage.
- 9. device according to claim 6, it is characterised in that in the liquid measure cylinder, one is provided with above delivery port The pressure/force sensor；In the liquid measure cylinder, a pressure/force sensor is provided with above water inlet；The top of the liquid measure cylinder is provided with opening；In the liquid measure cylinder, it is provided with close to the position of the opening described in one Pressure/force sensor；In the liquid measure cylinder, a pressure/force sensor is provided with above liquid level.
- 10. device according to claim 9, it is characterised in that two pressures in the liquid that the liquid measure cylinder is held Two pressure/force sensors outside the default difference in height and the liquid levels of by force/pressure sensor it is default Difference in height is the 1/6-1/9 of the liquid measure cylinder height；The default difference in height for the pressure/force sensor of two in liquid that the liquid measure cylinder is held and the liquid liquid The default difference in height of two pressure/force sensors outside face is equal in magnitude.
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