CN110375823A - Contactless static pressure liquid level meter and level measuring method - Google Patents
Contactless static pressure liquid level meter and level measuring method Download PDFInfo
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- CN110375823A CN110375823A CN201910751825.XA CN201910751825A CN110375823A CN 110375823 A CN110375823 A CN 110375823A CN 201910751825 A CN201910751825 A CN 201910751825A CN 110375823 A CN110375823 A CN 110375823A
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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 application discloses contactless static pressure liquid level meter and level measuring method, is related to water resource business scope, and liquidometer includes: level gauging pipe, the first static pressure transducer, the second static pressure transducer, temperature sensor and processor；Level gauging pipe includes the first end and second end being arranged along its length, and first end includes a gap that is open and being connected to and be located at level gauging pipe side wall with opening；First end is for being placed in testing liquid bottom；When first end is placed in testing liquid bottom, the first static pressure transducer, the second static pressure transducer, temperature sensor and processor are located at the liquid level of testing liquid far from the side of first end；First static pressure transducer is connected with the lumen of level gauging pipe, the absolute pressure of the pipe chamber air for acquiring liquid level measurement pipe；Second static pressure transducer is connected to ambient atmosphere, for acquiring the absolute pressure of liquid level measurement pipe outside atmosphere.Sensor is isolated with testing liquid when such level gauging, avoids phenomena such as sensor corrosion occurs.
Description
Technical field
This application involves water resource business scopes, specifically, being related to a kind of contactless static pressure liquid level meter and liquid level is surveyed
Amount method.
Background technique
When the height (hereinafter referred to as liquid level) of liquid measures in container, more commonly used device is static pressure liquid level
Meter.In general, traditional static pressure liquid level meter needs to put into the bottom of fluid to be measured, there are many drawbacks for this mode:
When static pressure liquid level meter to be put into the bottom of fluid to be measured, corresponding sensor is also needed in merging liquid, in this way
The pressure-sensitive diaphragm that will lead to sensor is easily stained, blocks, and water impact is also possible to cause the measured value of sensor inaccurate, if
If liquid is corrosive liquids, it is also possible to cause to corrode to static pressure liquid level meter, further reduced the accuracy of measured value.
Summary of the invention
In view of this, the application provides a kind of contactless static pressure liquid level meter and level measuring method, in level gauging,
Only liquid bottom need to be immersed in one end of level gauging pipe, each sensor is held in outside testing liquid, is solved existing
There are the various deficiencies of the contact static pressure liquid level meter in technology.
In order to solve the above-mentioned technical problem, the application has following technical solution:
In a first aspect, the application provides a kind of contactless static pressure liquid level meter, comprising: level gauging pipe, the first static pressure pass
Sensor, the second static pressure transducer, temperature sensor and processor, first static pressure transducer, second static pressure transducer
It is electrically connected respectively with the processor with the temperature sensor；
The level gauging pipe includes the first end and second end being arranged along its length, and the first end includes one spacious
Mouth and the gap that the level gauging pipe side wall is connected to and be located at the opening；The first end is for being placed in testing liquid
Bottom, the length of the level gauging pipe are greater than the liquid level depth of the testing liquid；When the first end is placed in prepare liquid
When body bottom, first static pressure transducer, the second static pressure transducer, temperature sensor and processor are located at the liquid of testing liquid
Side of the face far from the first end；
First static pressure transducer is connected with the lumen of the level gauging pipe, for acquiring the level gauging pipe
Pipe chamber air absolute pressure；Second static pressure transducer is connected to ambient atmosphere, for acquiring the level gauging
The absolute pressure of pipe outside atmosphere；The temperature sensor is for acquiring thermodynamic temperature.
Optionally, in which:
First static pressure transducer, second static pressure transducer, the temperature sensor and the processor are integrated
In same accommodating inside cavity, the accommodating cavity is fixed on the second end of the level gauging pipe far from the one of the first end
Side.
Optionally, in which:
The accommodating cavity includes the first gas chamber, the second gas chamber and the first cavity being isolated from each other, along the accommodating cavity
Length direction, first gas chamber is located at side of first static pressure transducer far from first cavity, described second
Gas chamber is located at side of second static pressure transducer far from first cavity；First static pressure transducer and described first
Gas chamber is connected, and second static pressure transducer is connected with second gas chamber, the temperature sensor and the processor
In first cavity；
The second end includes the first air hole towards the side of first gas chamber, and first gas chamber is towards the liquid
The side of position measurement pipe includes the second air hole, and second air hole is connected to first air hole, first static pressure
Sensor is connected by first air hole and second air hole with the lumen of the level gauging pipe；
Side of second gas chamber far from first gas chamber includes third air hole, and second static pressure transducer is logical
The third air hole is crossed to be connected with ambient atmosphere.
Optionally, in which:
First static pressure transducer, second static pressure transducer, the temperature sensor and the processor are integrated
In same accommodating inside cavity, the accommodating cavity is fixed in the lumen of the level gauging pipe close to the one of the second end
Side.
Optionally, in which:
The accommodating cavity includes the first gas chamber, the second gas chamber and the first cavity being isolated from each other, along the accommodating cavity
Length direction, first gas chamber is located at side of first static pressure transducer far from first cavity, described second
Gas chamber is located at side of second static pressure transducer far from first cavity；First static pressure transducer and described first
Gas chamber is connected, and second static pressure transducer is connected with second gas chamber, the temperature sensor and the processor
In first cavity；；
First gas chamber includes the 4th air hole towards the side of the first end, and first static pressure transducer passes through
4th air hole is connected with the lumen of the level gauging pipe；The second end of the level gauging pipe includes the 5th ventilative
Hole, second static pressure transducer are connected by the 5th air hole with ambient atmosphere.
Optionally, in which:
The level gauging pipe includes metal material, and the metal material is noncorroding metal material, alternatively, in the gold
The surface for belonging to material is covered with corrosion-resistant material.
Optionally, in which:
Along the length direction of the level gauging pipe, the height of the gap is L1, wherein 2mm≤L1≤3mm。
Second aspect, the application provide a kind of level gauging based on any of the above-described contactless static pressure liquid level meter
Method, wherein the contactless static pressure liquid level meter include: level gauging pipe, the first static pressure transducer, the second static pressure transducer,
Temperature sensor and processor, the level measuring method include:
By the bottom of container where the first end merging testing liquid of the level gauging pipe, and make the level gauging
Manage it is vertical with the liquid level of testing liquid, first static pressure transducer, the second static pressure transducer, temperature sensor be located at described in
It surveys except liquid levels；
First static pressure transducer acquires the absolute pressure P of the pipe chamber air of the level gauging pipe in real timeIt is interior, described
Second static pressure transducer acquires the absolute pressure P of ambient atmosphere in real timeOutside, the temperature sensor acquires thermodynamic temperature in real time；
The processor periodically acquires first static pressure transducer, second static pressure transducer and the temperature and passes
The data of sensor, and liquid level depth is calculated, specifically:
Work as PIt is interior=POutsideWhen, liquid level depth is less than or equal to the gap height L of the level gauging pipe1；
Work as PIt is interior≠POutsideWhen, testing liquid enters the liquid in the level gauging pipe and being located in the level gauging pipe
Depth is greater than the gap height L1, it is assumed that liquid in the level gauging pipe be located at outside the level gauging pipe
The depth difference of liquid is h1, then h1=(PInterior 1-POutside)/ρ g, wherein PInterior 1The liquid level currently measured for the first static pressure transducer
The absolute pressure of the pipe chamber air of measurement pipe, POutsideFor the absolute pressure for the atmosphere that the second static pressure transducer currently measures, ρ be to
Survey the density of liquid, g 9.8N/kg；
According to formula PInterior 0×L0/T0=PInterior 1×(L0-△L)/T1, the depth △ of the liquid in level gauging pipe is calculated
L, wherein L0For the initial length of level gauging pipe gas chamber, PInterior 0P is measured for the processor last timeIt is interior=POutsideWhen liquid level survey
Absolute pressure in buret, T0P is measured for the last side of the processorIt is interior=POutsideWhen thermodynamic temperature, PInterior 1For current level
Absolute pressure in measurement pipe, T1For the thermodynamic temperature currently measured；
According to formula H=h1+ △ L+L1Obtain liquid level depth H.
Optionally, in which:
The processor obtains last time and measures PIt is interior=POutsideWhen level gauging pipe in absolute pressure and last time
Measure PIt is interior=POutsideWhen thermodynamic temperature method are as follows:
Processor acquires the primary period according to every 100ms, acquires first static pressure transducer, second static pressure passes
The data of sensor and the temperature sensor obtain the absolute pressure P of current atmospheric pressureOutside, absolute pressure in level gauging pipe
PIt is interiorAnd current thermodynamic temperature T；
Work as PIt is interior=POutside, then the P currently readIt is interiorIt is stored as PInterior 0, T is stored as T0；A P is updated every the period of 0.1sInterior 0
And T0, until PIt is interior≠POutside；
Work as PIt is interior≠POutsideWhen, no longer update PInterior 0And T0, when detecting P for the first timeIt is interior≠POutsideWhen, last updated PInterior 0And T0As
Last time measures PIt is interior=POutsideWhen level gauging pipe in absolute pressure and last time measure PIt is interior=POutsideWhen thermodynamics temperature
Degree.
Compared with prior art, contactless static pressure liquid level meter and level measuring method described herein, reached as
Lower effect:
Contactless static pressure liquid level meter provided herein and level measuring method, liquidometer include level gauging pipe,
Processor and three sensors being electrically connected with processor, three sensors are namely for measuring inside level gauging pipe lumen
First static pressure transducer of pressure, the second static pressure transducer for measuring atmospheric pressure and the temperature for measuring thermodynamic temperature
Spend sensor；It, only need to be by the first end of level gauging pipe perpendicular to testing liquid liquid level when measuring the liquid level of testing liquid
Direction be placed in testing liquid bottom, processor and three sensors are in the outside of testing liquid, without entering
In liquid level to be measured, therefore each sensor not will receive the influence of the factors such as property, the water impact of testing liquid, thus favorably
In the accuracy for promoting level gauging result.In addition, pressure data and temperature data of the application using the acquisition of each sensor, knot
Liquid level depth can be calculated by closing corresponding formula, simple and easy to use, but also not will increase the cost of static pressure liquid level meter.
Detailed description of the invention
Bright attached drawing described herein is used to provide further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 show a kind of structural schematic diagram of contactless static pressure liquid level meter provided by the embodiment of the present application；
Fig. 2 show one kind of processor and sensor in contactless static pressure liquid level meter provided by the embodiment of the present application
Electrical connection figure；
Fig. 3, which is shown, is integrated in a kind of intracorporal structural representation of same accommodating cavity for three static pressure transducers and processor
Figure；
Fig. 4 show another structural schematic diagram of contactless static pressure liquid level meter provided by the embodiment of the present application；
Fig. 5 show a kind of flow chart of level measuring method provided by the embodiment of the present application；
Fig. 6 show a kind of schematic diagram that the first end of level gauging pipe is entered to liquid level to be measured bottom.
Specific embodiment
As used some vocabulary to censure specific components in the specification and claims.Those skilled in the art answer
It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims are not with name
The difference of title is as the mode for distinguishing component, but with the difference of component functionally as the criterion of differentiation.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer within the acceptable error range, those skilled in the art can within a certain error range solve described in
Technical problem basically reaches the technical effect.Specification subsequent descriptions are to implement the better embodiment of the application, so described
Description is being not intended to limit the scope of the present application for the purpose of the rule for illustrating the application.The protection scope of the application
As defined by the appended claims.
When the height (hereinafter referred to as liquid level) of liquid measures in container, more commonly used device is static pressure liquid level
Meter.In general, traditional static pressure liquid level meter needs to put into the bottom of fluid to be measured, there are many drawbacks for this mode:
When static pressure liquid level meter to be put into the bottom of fluid to be measured, corresponding sensor is also needed in merging liquid, in this way
The pressure-sensitive diaphragm that will lead to sensor is easily stained, blocks, and water impact is also possible to cause the measured value of sensor inaccurate, if
If liquid is corrosive liquids, it is also possible to cause to corrode to static pressure liquid level meter, further reduced the accuracy of measured value.
In view of this, the application provides a kind of contactless static pressure liquid level meter and level measuring method, in level gauging,
Only liquid bottom need to be immersed in one end of level gauging pipe, each sensor is held in outside testing liquid, is solved existing
There are the various deficiencies of the contact static pressure liquid level meter in technology.
It is described in detail below with reference to the drawings and specific embodiments.
Fig. 1 show a kind of structural schematic diagram of contactless static pressure liquid level meter provided by the embodiment of the present application, please join
See Fig. 1, the application provides a kind of contactless static pressure liquid level meter 100, comprising: level gauging pipe 10, the first static pressure transducer 21,
Second static pressure transducer 22, temperature sensor 23 and processor 24, the first static pressure transducer 21, the second static pressure transducer 22 and temperature
Degree sensor 23 is electrically connected with processor 24 respectively；
Level gauging pipe 10 includes the first end and second end that is arranged along its length, first end include an opening 11 with
And the gap 12 of 10 side wall of level gauging pipe is connected to and is located at opening 11；First end is for being placed in testing liquid bottom, liquid level
The length of measurement pipe 10 is greater than the liquid level depth of testing liquid；When first end is placed in testing liquid bottom, the first static pressure sensing
Device 21, the second static pressure transducer 22, temperature sensor 23 and processor 24 are located at the liquid level of testing liquid far from the one of first end
Side；
First static pressure transducer 21 is connected with the lumen of level gauging pipe 10, for acquiring the lumen of liquid level measurement pipe 10
The absolute pressure of interior air；Second static pressure transducer 22 is connected to ambient atmosphere, for acquiring 10 outside atmosphere of liquid level measurement pipe
Absolute pressure；Temperature sensor 23 is for acquiring thermodynamic temperature.
It should be noted that Fig. 1 only representatively illustrates the first static pressure transducer 21, the second static pressure transducer 22, processing
A kind of relative position relation figure of device 24 and level gauging pipe 10, does not embody actual connection relationship, does not represent reality yet
The size and number on border.In contactless static pressure liquid level meter 100 provided herein, the company of processor 24 and three sensors
The relationship of connecing can be found in Fig. 2, wherein Fig. 2 show in contactless static pressure liquid level meter 100 provided by the embodiment of the present application and handles
A kind of electrical connection figure of device 24 and sensor, processor 24 can (such as human-computer interaction be set by communication line and external equipment
It is standby 30) to connect, for realizing the communication with external equipment, such as level gauging result etc. can be transmitted to external equipment.This Shen
Please in temperature sensor 23 measure be 23 position of temperature sensor thermodynamic temperature, be similar to atmospheric temperature.This
MCU etc. can be used in processor in application, and the application is to this without specifically limiting.In addition, the application is by level gauging pipe 10
When being placed in testing liquid, the container inner wall or and prepare liquid that immobilising device is fixed on testing liquid is can be used in level gauging pipe 10
On the adjacent wall of body, the fixation of level gauging pipe is realized with this.Above-mentioned immobilising device for example may include anchor ear and expanding screw
Anchor ear is fixed on container inner wall or wall by bolt, anchor ear for covering in level gauging pipe periphery, then by expansion bolt.
Specifically, continuing with referring to Fig. 1, contactless static pressure liquid level meter 100 provided herein, including level gauging
Pipe 10, processor 24 and three sensors being electrically connected with processor 24, three sensors are namely for measuring level gauging
First static pressure transducer 21 of 10 lumen internal pressure of pipe, the second static pressure transducer 22 for measuring atmospheric pressure and for surveying
Measure the temperature sensor 23 of thermodynamic temperature；It, only need to be by the first end of level gauging pipe 10 when measuring the liquid level of testing liquid
Be placed in testing liquid bottom with the direction perpendicular to testing liquid liquid level, when by the first end of level gauging pipe 10 be placed in
When surveying in liquid, since the length of level gauging pipe 10 is greater than the liquid level depth of liquid level to be measured, processor 24 and three biographies
Sensor will be in the outside of testing liquid, and without entering in liquid level to be measured, therefore each sensor not will receive prepare liquid
The influence of the factors such as property, the water impact of body efficiently solves existing to be conducive to be promoted the accuracy of level gauging result
There are various deficiencies present in the static pressure liquid level meter 100 in technology.In addition, the pressure data that the application utilizes each sensor to obtain
And temperature data, liquid level depth can be calculated in conjunction with corresponding formula, simple and easy to use, the requirement to operator is not
Height, but also not will increase the cost of static pressure liquid level meter 100.
In some optional embodiments, it show incorporated by reference to Fig. 1 and Fig. 3, Fig. 3 by three static pressure transducers and processor 24
A kind of structural schematic diagram being integrated in same accommodating cavity 20, the first static pressure transducer 21, the second static pressure transducer 22, temperature
Sensor 23 and processor 24 are integrated in inside same accommodating cavity 20, and accommodating cavity 20 is fixed on the second of level gauging pipe 10
Hold the side far from first end.
In the actual production process, accommodating cavity 20 and level gauging pipe 10 can make respectively, again will after completing
But the two is sealed fixation, seals fixed mode for example and can be screw thread installation, welding etc., also after again aligning the two
In the outer surface of the two, the specific material of winding is sealed fixed etc., and the application is to this without specifically limiting.
In some optional embodiments, continuing with Fig. 1 and Fig. 3 is combined, accommodating cavity 20 includes the first gas being isolated from each other
Room 31, the second gas chamber 32 and the first cavity 33, along the length direction of accommodating cavity, the first gas chamber 31 is located at the first static pressure transducer
21 sides far from the first cavity 33, the second gas chamber 32 are located at one of the second static pressure transducer 22 far from first cavity 33
Side；First static pressure transducer 21 with
First gas chamber 31 is connected, and the second static pressure transducer 22 is connected with the second gas chamber 32, temperature sensor 23 and place
Reason device 24 is located in the first cavity 33；
The second end of level gauging pipe 10 includes the first air hole 41,31 court of the first gas chamber towards the side of the first gas chamber 31
It include the second air hole 42 to the side of level gauging pipe 10, the second air hole 42 is connected to the first air hole 41, the first static pressure
Sensor 21 is connected by the first air hole 41 and the second air hole 42 with the lumen of level gauging pipe 10；
Side of second gas chamber 32 far from the first gas chamber 31 includes third air hole 43, and the second static pressure transducer 22 passes through the
Three air holes 43 are connected with ambient atmosphere.
It should be noted that Fig. 1 and Fig. 3 only schematically illustrate each air hole, actual structure is not represented
And size.Air hole mentioned in each embodiment of the application can be single through-hole structure, can also be reticular structure, purpose
It is that the lumen of the first gas chamber 31 and level gauging pipe 10 where guaranteeing the first static pressure transducer 21 remains connected to lead to, so that the
One gas chamber 31 is consistent with the pressure in the lumen of level gauging pipe 10, so that the first static pressure transducer 21 can be accurate
Measure the pressure in the lumen of level gauging pipe 10.In addition, in side setting the of second gas chamber 32 far from the first gas chamber 31
Three air holes 43, so that the second gas chamber 32 is connected with ambient atmosphere, the third air hole 43 being so located in the second gas chamber 32
The pressure of ambient atmosphere can be accurately measured.About the first air hole 41, the ruler of the second air hole 42 and third air hole 43
It is very little, guarantee the first gas chamber 31 can and level gauging pipe 10 lumen keep being connected to while guarantee the second gas chamber 32 can with it is outer
Boundary's atmosphere keep connection under the premise of, it is the smaller the better, for example, when air hole use single through-hole structure when, air hole it is straight
Diameter can be designed in 1cm-2cm, in this way, accommodating cavity 20 can be as much as possible by the first static pressure transducer and the second static pressure transducer
22 claddings, so that the first static pressure transducer 21 and the second static pressure transducer 22 are played the role of being effectively protected and be fixed, keep away
Exempt from the first static pressure transducer 21 and the influence exposed and by extraneous factor of the second static pressure transducer 22.
It is also pointed out that the pressure that the first static pressure transducer 21 and the second static pressure transducer 22 in the application are monitored
It is by force absolute pressure.
It should be noted that the first static pressure transducer and the second static pressure transducer in the application can be used pressure-sensitive diaphragm with
The mode of signal wire electrical connection is constituted, and in actual installation process, pressure-sensitive diaphragm is as measuring surface, towards the first gas chamber or second
Gas chamber, for measuring the pressure in the first gas chamber or the second gas chamber；The side of signal wire is electrically connected towards the first cavity with processor
It connects, to realize the signal transmitting between static pressure transducer and processor.Assuming that the first static pressure transducer includes first pressure film
Piece, the second static pressure transducer include second pressure diaphragm, then first pressure diaphragm and second pressure diaphragm can be by accommodating cavities
Body is divided into the first gas chamber, the first cavity and the second gas chamber, and the first gas chamber, the first cavity and the second gas chamber three are not connected,
Temperature sensor and processor are placed in first cavity.The depth of first gas chamber and the second gas chamber can be very small, as long as air
It can sufficiently be contacted with static pressure transducer after air hole entrance.
In above-described embodiment, for placing the first static pressure transducer 21, the second static pressure transducer 22,23 and of temperature sensor
The accommodating cavity 20 of processor 24, be with level gauging pipe 10 it is relatively independent, in addition to such implementation, in some optional realities
It applies in example, refers to Fig. 4, Fig. 4 show another knot of contactless static pressure liquid level meter 100 provided by the embodiment of the present application
Structure schematic diagram, the first static pressure transducer 21, the second static pressure transducer 22, temperature sensor 23 and processor 24 are integrated in same appearance
It sets inside cavity 20, accommodating cavity 20 is fixed on the side in the lumen of level gauging pipe 10 close to second end.
Embodiment illustrated in fig. 4 gives for placing the first static pressure transducer 21, the second static pressure transducer 22, temperature sensing
One of the lumen of level gauging pipe 10 situation is arranged in the accommodating cavity 20 of device 23 and processor 24, in such embodiment
In, for placing the accommodating cavity of the first static pressure transducer 21, the second static pressure transducer 22, temperature sensor 23 and processor 24
20 are located inside the lumen of level gauging pipe 10, and close to the second end of level gauging pipe 10, need that cavity 20 will be accommodated at this time
Size design the internal diameter no more than level gauging pipe 10, and accommodate the energy inside the lumen of level gauging pipe 10 of cavity 20
Reliable fixation is accessed, fixed form is, for example, gluing, is also possible to be mechanically connected, and the application is to this without specifically limiting
It is fixed.When adopting the structure the contactless static pressure liquid level meter 100 to be formed measurement liquid level, processor 24 and the same energy of each sensor
It is enough to be isolated with testing liquid, solve various deficiencies existing in the prior art.
In some optional embodiments, continuing with referring to fig. 4, accommodating cavity 20 include the first gas chamber 31 being isolated from each other,
Second gas chamber 32 and the first cavity 33, along the length direction of the accommodating cavity 20, the first gas chamber 31 is located at the first static pressure sensing
Side of the device 21 far from the first cavity 33, the second gas chamber 32 are located at side of second static pressure transducer 22 far from the first cavity 33；
First static pressure transducer 21 is connected with the first gas chamber 31, and the second static pressure transducer 22 is connected with the second gas chamber 32, and temperature passes
Sensor 23 and processor 24 are located in first cavity 33；；
First gas chamber 31 includes the 4th air hole 44 towards the side of first end, and the first static pressure transducer 21 is saturating by the 4th
Stomata 44 is connected with the lumen of level gauging pipe 10；The second end of level gauging pipe 10 includes the 5th air hole 45, and second is quiet
Pressure sensor 22 is connected by the 5th air hole 45 with ambient atmosphere.
It should be noted that needing when that will accommodate cavity 20 and be placed in the lumen of level gauging pipe 10 by the second gas chamber
32 are isolated with the intraluminal air pressure of level gauging pipe 10, and the mode of isolation for example can be by the outer wall of the second cavity and lumen
Inner wall seamless connection, such as will be bonded by packaging plastic, fixed effect can be realized, and can realize the effect of air pressure isolation.
In embodiment illustrated in fig. 4, to realize being connected for the second static pressure transducer 22 and ambient atmosphere, in the second gas chamber 32
Side far from the first gas chamber 31 may be disposed at the corresponding air hole 46 of the 5th air hole 45.First gas chamber 31 and the second gas chamber 32
On the diameter of air hole can design in 1cm-2cm, in this way, accommodating cavity 20 can be as much as possible by the first static pressure transducer 21
It is coated with the second static pressure transducer 22, so that the first static pressure transducer 21 and the second static pressure transducer 22 are played and be effectively protected
And fixed effect, avoid the first static pressure transducer 21 and the influence exposed and by extraneous factor of the second static pressure transducer 22.
It should be noted that embodiment illustrated in fig. 4 show by the first static pressure transducer 21, the second static pressure transducer 22,
The situation in same accommodating cavity 20 is arranged in temperature sensor 23 and processor 24, in some other embodiments of the application
In, each sensor and processor 24 also can be located separately in different accommodating cavities, then uniformly be placed in the lumen of level gauging pipe 10
Interior corresponding position, the application is to this without specifically limiting.
In some optional embodiments, level gauging pipe 10 includes metal material, and metal material is noncorroding metal material,
Such as stainless steel material；Alternatively, being covered with corrosion-resistant material on the surface of metal material, such as zinc-plated etc..Liquid in the application
No matter position measurement pipe 10 enables to the application non-contact using noncorroding metal material or corrosion-resistant material being deposited
Static pressure liquid level meter 100 can be preferably applied in the measurement of corrosive liquids, and reduction testing liquid is to liquid level to the full extent
The corrosion of measurement pipe 10 is conducive to the service life for promoting the contactless static pressure liquid level meter 100 of the application.
In some optional embodiments, referring to Figure 1 and Fig. 4, along the length direction of level gauging pipe 10, the height of gap 12
Degree is L1, wherein 2mm≤L1≤3mm。
Specifically, gap 12 is arranged in the first end of level gauging pipe 10 in the application, and the gap 12 is for realizing prepare liquid
Connection inside body and lumen, the height by gap 12 along the length direction of level gauging pipe 10 are arranged in 2mm≤L1≤ 3mm,
When level gauging pipe 10 to be placed in testing liquid, the gap 12 of such size can guarantee that testing liquid slowly enters lumen
Inside, so that the pressure inside lumen is slowly varying, the phenomenon that avoiding lumen internal pressure from mutating, so that the
One static pressure transducer 21 can accurately measure the pressure in 10 lumen of level gauging pipe, to be conducive to improve level gauging
Accuracy.
It should be noted that further to promote the accuracy of level gauging and reducing the production of static pressure liquid level meter 100
Process, level gauging pipe 10 provided by the embodiment of the present application are chosen as vertical tubular structure, level gauging pipe 10 in the application
Length can be also configured according to actual needs according to actual measurement demand flexible setting, internal diameter and pipe thickness, this
Application is to this without specifically limiting.
Based on the same inventive concept, the application also provides a kind of based on contactless quiet provided by any of the above-described embodiment
The level measuring method of liquidometer 100 is pressed, incorporated by reference to Fig. 1-Fig. 6, wherein Fig. 5 show liquid level provided by the embodiment of the present application
A kind of flow chart of measurement method, Fig. 6, which is shown, shows one kind that the first end of level gauging pipe 10 enters liquid level to be measured bottom
It is intended to, contactless static pressure liquid level meter 100 includes: level gauging pipe 10, the first static pressure transducer 21, the second static pressure transducer
22, temperature sensor 23 and processor 24, level measuring method include:
Step 101, the bottom that the first end of level gauging pipe 10 is placed in 200 place container of testing liquid, and make liquid
Position measurement pipe 10 is vertical with the liquid level of testing liquid 200, the first static pressure transducer 21, the second static pressure transducer 22, temperature sensing
Device 23 is located at except 200 liquid level of testing liquid；
Step 102, the first static pressure transducer 21 acquire the absolute pressure P of the pipe chamber air of liquid level measurement pipe 10 in real timeIt is interior,
Second static pressure transducer 22 acquires the absolute pressure P of ambient atmosphere in real timeOutside, the real-time acquisition thermodynamic temperature of temperature sensor 23；
Step 103, processor 24 periodically the first static pressure transducer 21 of acquisition, the second static pressure transducer 22 and temperature sensing
The data of device 23, and liquid level depth is calculated, specifically:
Work as PIt is interior=POutsideWhen, liquid level depth is less than or equal to the 12 height L of gap of level gauging pipe 101；
Work as PIt is interior≠POutsideWhen, testing liquid 200 enters the liquid in level gauging pipe 10 and being located in level gauging pipe 10
Depth is greater than 12 height L of gap1, it is assumed that the liquid in level gauging pipe 10 and the liquid outside level gauging pipe 10
Depth difference is h1, then h1=(PInterior 1-POutside)/ρ g, wherein PInterior 1The level gauging pipe 10 currently measured for the first static pressure transducer 21
Pipe chamber air absolute pressure, POutsideFor the absolute pressure for the atmosphere that the second static pressure transducer 22 currently measures, ρ is prepare liquid
The density of body 200, g 9.8N/kg；
According to formula PInterior 0×L0/T0=PInterior 1×(L0-△L)/T1, the depth of the liquid in level gauging pipe 10 is calculated
△ L, it is contemplated that the height L of gap 121Very little almost can be ignored, therefore herein regard △ L in level gauging pipe 10 as
Liquid depth, for accurate, △ L refers to the distance at the liquid level to 12 position of gap of liquid in level gauging pipe 10.On
It states in formula, L0For the initial length of 10 gas chamber of level gauging pipe, PInterior 0P is measured for 24 last time of processorIt is interior=POutsideWhen liquid level
Absolute pressure in measurement pipe 10, T0P is measured for the last side of processor 24It is interior=POutsideWhen thermodynamic temperature, PInterior 1For current liquid
Absolute pressure in the measurement pipe 10 of position, T1For the thermodynamic temperature currently measured；
According to formula H=h1+ △ L+L1Obtain liquid level depth H.
It specifically, in the actual operation process, only need to be by liquid level in level measuring method provided by the embodiment of the present application
For the first end of measurement pipe 10 to be placed in testing liquid 200 perpendicular to testing liquid 200, testing liquid 200 will be by being located at liquid
The gap 12 of position 10 first end of measurement pipe slowly enters in the lumen of level gauging pipe 10.First static pressure transducer 21 will be adopted in real time
Collect the intraluminal absolute pressure of liquid level measurement pipe 10, the second static pressure transducer 22 will acquire the absolute pressure of ambient atmosphere in real time
By force, temperature sensor 23 will acquire thermodynamic temperature in real time.The processor 24 being electrically connected with these three sensors will periodically
The data of these three sensors are acquired, and judge actual liquid level according to collected data.
When the first static pressure transducer 21 and the equal collected pressure of the second static pressure transducer 22, i.e. PIt is interior=POutsideWhen, it says
Bright testing liquid 200 does not flood gap 12, i.e. height L of the liquid level depth less than or equal to gap 121, the pipe of level gauging pipe 10
It still remains connected to lead to ambient atmosphere in chamber.Work as PIt is interior≠POutsideWhen, illustrate that testing liquid 200 injects level gauging pipe by gap 12
Do not had gap 12 after in 10, by gas confinement in lumen and compressed, air pressure in lumen is caused to increase.To in level gauging pipe 10
Pressure when keeping stablizing, liquid in figure in level gauging pipe 10 can be obtained by liquid pressure formula P=ρ gh and be located at liquid
Depth difference h1=(the P of liquid outside the measurement pipe 10 of positionInterior 1-POutside)/ρ g, wherein 200 density p of testing liquid is known and fixed, and g is
Definite value 9.8N/kg, PInterior 1For the metal intraductal pressure that static pressure type liquid level sensor currently measures, POutsideFor the atmospheric pressure currently measured
By force.In view of final liquid level H=h1+ △ L+L1, wherein △ L be level gauging pipe 10 in liquid depth, at present h1 and
L1It is known that final liquid level depth can be obtained in the depth △ L that need to only measure the liquid in level gauging pipe 10.Level gauging
The depth △ L of liquid in pipe 10 can be according to formula PInterior 0×L0/T0=PInterior 1×(L0-△L)/T1It obtains.Since processor 24 is
Periodically acquire the data of each sensor, the P in formulaInterior 0P is measured for 24 last time of processorIt is interior=POutsideWhen level gauging
Absolute pressure in pipe 10, T0P is measured for the last side of processor 24It is interior=POutsideWhen thermodynamic temperature, PInterior 1For current level survey
Absolute pressure in buret 10, T1For the thermodynamic temperature currently measured.In the depth for obtaining the liquid in level gauging pipe 10
After △ L, according to formula H=h1+ △ L+L1Final liquid level depth can be obtained.
It should be noted that above-mentioned formula PInterior 0×L0/T0=PInterior 1×(L0-△L)/T1It is according to The Ideal-Gas Equation
It obtains.The Ideal-Gas Equation is pV=nRT, and wherein p refers to the pressure of gas, and V is the volume of gas, and n indicates gas
The amount of substance, T indicate the thermodynamic temperature of perfect gas, and it is constant that R, which is ideal gas constant,.When the liquid of static pressure liquid level meter 100
When position 10 first end of measurement pipe is immersed among liquid, the amount n for the gaseous matter being enclosed in pipe will not change, and become constant,
Assuming that metal tube sectional area is constant S, then meet (P before immersion liquidInterior 0×S×L0)/T0=nR；Meet after immersion liquid
(PInterior 1×S×(L0-△L))/T1=nR, since nR is constant, so (PInterior 0×S×L0)/T0=(PInterior 1×S×(L0-△L))/T1
Above-mentioned formula P is obtained from thisInterior 0×L0/T0=PInterior 1×(L0-△L)/T1。
In some optional embodiments, in above-mentioned steps 103, processor 24 obtains last time and measures PIt is interior=POutsideWhen liquid level
Absolute pressure and last time in measurement pipe 10 measure PIt is interior=POutsideWhen thermodynamic temperature method are as follows:
Processor 24 acquires the primary period according to every 100ms, acquires the first static pressure transducer 21, the second static pressure transducer
22 and temperature sensor 23 data, obtain the absolute pressure P of current atmospheric pressureOutside, absolute pressure P in level gauging pipe 10It is interior
And current thermodynamic temperature T；
Work as PIt is interior=POutside, then the P currently readIt is interiorIt is stored as PInterior 0, T is stored as T0；A P is updated every the period of 0.1sInterior 0
And T0, until PIt is interior≠POutside；
Work as PIt is interior≠POutsideWhen, no longer update PInterior 0And T0, when detecting P for the first timeIt is interior≠POutsideWhen, last updated PInterior 0And T0As
Last time measures PIt is interior=POutsideWhen level gauging pipe 10 in absolute pressure and last time measure PIt is interior=POutsideWhen thermodynamics
Temperature.
As long as that is, PIt is interior=POutside, just the P currently newly readIt is interiorIt is stored as PInterior 0, T is stored as T0, until PIt is interior≠POutside
When, it no longer updates, and detects PIt is interior≠POutsideAdjacent PInterior 0And T0P is as measured for the last timeIt is interior=POutsideWhen level gauging pipe 10 in
Absolute pressure and last time measure PIt is interior=POutsideWhen thermodynamic temperature.
It should be noted that all having the execution of processor 24 to the acquisition of pressure data and temperature data, without artificial
Interfered, the processor 24 can external human-computer interaction device 30, operator can be by human-computer interaction device 30 to processor
24 send instruction, so that it is started the measurement work of liquid level, and level gauging result is sent to human-computer interaction device 30 and is shown, grasp
Make simple, convenient, fast.
As can be seen from the above embodiments beneficial effect existing for the application is:
Contactless static pressure liquid level meter provided herein and level measuring method, liquidometer include level gauging pipe,
Processor and three sensors being electrically connected with processor, three sensors are namely for measuring inside level gauging pipe lumen
First static pressure transducer of pressure, the second static pressure transducer for measuring atmospheric pressure and the temperature for measuring thermodynamic temperature
Spend sensor；It, only need to be by the first end of level gauging pipe perpendicular to testing liquid liquid level when measuring the liquid level of testing liquid
Direction be placed in testing liquid bottom, processor and three sensors are in the outside of testing liquid, without entering
In liquid level to be measured, therefore each sensor not will receive the influence of the factors such as property, the water impact of testing liquid, thus favorably
In the accuracy for promoting level gauging result.In addition, pressure data and temperature data of the application using the acquisition of each sensor, knot
Liquid level depth can be calculated by closing corresponding formula, simple and easy to use, but also not will increase the cost of static pressure liquid level meter.
It should be understood by those skilled in the art that, embodiments herein can provide as method, apparatus or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
Above description shows and describes several preferred embodiments of the present application, but as previously described, it should be understood that the application
Be not limited to forms disclosed herein, should not be regarded as an exclusion of other examples, and can be used for various other combinations,
Modification and environment, and the above teachings or related fields of technology or knowledge can be passed through within that scope of the inventive concept describe herein
It is modified.And changes and modifications made by those skilled in the art do not depart from spirit and scope, then it all should be in this Shen
It please be in the protection scope of appended claims.
Claims (9)
1. a kind of contactless static pressure liquid level meter characterized by comprising level gauging pipe, the first static pressure transducer, second quiet
Pressure sensor, temperature sensor and processor, first static pressure transducer, second static pressure transducer and the temperature pass
Sensor is electrically connected with the processor respectively；
The level gauging pipe includes the first end and second end being arranged along its length, the first end include one it is open with
And the gap of the level gauging pipe side wall is connected to and is located at the opening；The first end is for being placed in testing liquid bottom
Portion, the length of the level gauging pipe are greater than the liquid level depth of the testing liquid；When the first end is placed in testing liquid
When bottom, first static pressure transducer, the second static pressure transducer, temperature sensor and processor are located at the liquid level of testing liquid
Side far from the first end；
First static pressure transducer is connected with the lumen of the level gauging pipe, for acquiring the pipe of the level gauging pipe
The absolute pressure of chamber air；Second static pressure transducer is connected to ambient atmosphere, for acquiring outside the level gauging pipe
The absolute pressure of portion's atmosphere；The temperature sensor is for acquiring thermodynamic temperature.
2. a kind of contactless static pressure liquid level meter according to claim 1, which is characterized in that the first static pressure sensing
Device, second static pressure transducer, the temperature sensor and the processor are integrated in same accommodating inside cavity, the appearance
It sets cavity and is fixed on the second end of the level gauging pipe far from the side of the first end.
3. a kind of contactless static pressure liquid level meter according to claim 2, which is characterized in that the accommodating cavity includes that
The first gas chamber, the second gas chamber and the first cavity of this isolation, along the length direction of the accommodating cavity, first gas chamber is located at
Side of first static pressure transducer far from first cavity, it is remote that second gas chamber is located at second static pressure transducer
Side from first cavity；First static pressure transducer is connected with first gas chamber, the second static pressure sensing
Device is connected with second gas chamber, and the temperature sensor and the processor are located in first cavity；
The second end includes the first air hole towards the side of first gas chamber, and first gas chamber is surveyed towards the liquid level
The side of buret includes the second air hole, and second air hole is connected to first air hole, the first static pressure sensing
Device is connected by first air hole and second air hole with the lumen of the level gauging pipe；
Side of second gas chamber far from first gas chamber includes third air hole, and second static pressure transducer passes through institute
Third air hole is stated to be connected with ambient atmosphere.
4. a kind of contactless static pressure liquid level meter according to claim 1, which is characterized in that the first static pressure sensing
Device, second static pressure transducer, the temperature sensor and the processor are integrated in same accommodating inside cavity, the appearance
It sets cavity and is fixed on the side in the lumen of the level gauging pipe close to the second end.
5. a kind of contactless static pressure liquid level meter according to claim 4, which is characterized in that the accommodating cavity includes that
The first gas chamber, the second gas chamber and the first cavity of this isolation, along the length direction of the accommodating cavity, first gas chamber is located at
Side of first static pressure transducer far from first cavity, it is remote that second gas chamber is located at second static pressure transducer
Side from first cavity；First static pressure transducer is connected with first gas chamber, the second static pressure sensing
Device is connected with second gas chamber, and the temperature sensor and the processor are located in first cavity；；
First gas chamber includes the 4th air hole towards the side of the first end, and first static pressure transducer passes through described
4th air hole is connected with the lumen of the level gauging pipe；The second end of the level gauging pipe includes the 5th air hole,
Second static pressure transducer is connected by the 5th air hole with ambient atmosphere.
6. a kind of contactless static pressure liquid level meter according to claim 1, which is characterized in that the level gauging pipe includes
Metal material, the metal material is noncorroding metal material, alternatively, being covered with anticorrosive material on the surface of the metal material
Material.
7. a kind of contactless static pressure liquid level meter according to claim 1, which is characterized in that along the level gauging pipe
Length direction, the height of the gap are L1, wherein 2mm≤L1≤3mm。
8. a kind of level measuring method of any contactless static pressure liquid level meter based on claim 1-7, feature
It is, the contactless static pressure liquid level meter includes: level gauging pipe, the first static pressure transducer, the second static pressure transducer, temperature
Sensor and processor, the level measuring method include:
By the bottom of container where the first end of level gauging pipe merging testing liquid, and make the level gauging pipe with
The liquid level of testing liquid is vertical, and first static pressure transducer, the second static pressure transducer, temperature sensor are located at the prepare liquid
Except body fluid face；
First static pressure transducer acquires the absolute pressure P of the pipe chamber air of the level gauging pipe in real timeIt is interior, described second
Static pressure transducer acquires the absolute pressure P of ambient atmosphere in real timeOutside, the temperature sensor acquires thermodynamic temperature in real time；
The processor periodically acquires first static pressure transducer, second static pressure transducer and the temperature sensor
Data, and calculate liquid level depth, specifically:
Work as PIt is interior=POutsideWhen, liquid level depth is less than or equal to the gap height L of the level gauging pipe1；
Work as PIt is interior≠POutsideWhen, testing liquid enters the depth for the liquid in the level gauging pipe and being located in the level gauging pipe
Greater than the gap height L1, it is assumed that the liquid in the level gauging pipe and the liquid outside the level gauging pipe
Depth difference be h1, then h1=(PInterior 1-POutside)/ρ g, wherein PInterior 1The level gauging currently measured for the first static pressure transducer
The absolute pressure of the pipe chamber air of pipe, POutsideFor the absolute pressure for the atmosphere that the second static pressure transducer currently measures, ρ is prepare liquid
The density of body, g 9.8N/kg；
According to formula PInterior 0×L0/T0=PInterior 1×(L0-△L)/T1, the depth △ L of the liquid in level gauging pipe is calculated,
In, L0For the initial length of level gauging pipe gas chamber, PInterior 0P is measured for the processor last timeIt is interior=POutsideWhen level gauging pipe
Interior absolute pressure, T0P is measured for the last side of the processorIt is interior=POutsideWhen thermodynamic temperature, PInterior 1For current level measurement
Absolute pressure in pipe, T1For the thermodynamic temperature currently measured；
According to formula H=h1+ △ L+L1Obtain liquid level depth H.
9. level measuring method according to claim 8, which is characterized in that the processor obtains last time and measures PIt is interior
=POutsideWhen level gauging pipe in absolute pressure and last time measure PIt is interior=POutsideWhen thermodynamic temperature method are as follows:
Processor acquires the primary period according to every 100ms, acquires first static pressure transducer, second static pressure transducer
With the data of the temperature sensor, the absolute pressure P of current atmospheric pressure is obtainedOutside, absolute pressure P in level gauging pipeIt is interiorWith
And current thermodynamic temperature T；
Work as PIt is interior=POutside, then the P currently readIt is interiorIt is stored as PInterior 0, T is stored as T0；A P is updated every the period of 0.1sInterior 0And T0,
Until PIt is interior≠POutside；
Work as PIt is interior≠POutsideWhen, no longer update PInterior 0And T0, when detecting P for the first timeIt is interior≠POutsideWhen, last updated PInterior 0And T0As last
It is secondary to measure PIt is interior=POutsideWhen level gauging pipe in absolute pressure and last time measure PIt is interior=POutsideWhen thermodynamic temperature.
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