CN106768588A - A kind of Pneumatic water pressure measuring device - Google Patents
A kind of Pneumatic water pressure measuring device Download PDFInfo
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- CN106768588A CN106768588A CN201611107336.3A CN201611107336A CN106768588A CN 106768588 A CN106768588 A CN 106768588A CN 201611107336 A CN201611107336 A CN 201611107336A CN 106768588 A CN106768588 A CN 106768588A
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- pressure
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- pipe
- water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
Abstract
A kind of Pneumatic water pressure measuring device, including gas path device, gas path device top is two tracheaes, two tracheae bottom is connected at the top mouth of pipe of a three-way pipeline, wherein one upper tracheal is connected with pressure gas source in two tracheaes, and another upper tracheal is connected with a relative pressure sensor；The lower section mouth of pipe of the three-way pipeline is arranged at liquid level lower section；When two tracheal strips gassies, by water-stop at the mouth of pipe of lower section；Air is injected in the wherein one tracheae side from pressure gas source toward tracheal strips all the time；The relative pressure sensor of another tracheae connection can in real time measure the change of gas pressure intensity；By automatically controlling for pressure gas source, endotracheal air pressure is intended to keep balance with the hydraulic pressure of sealing all the time；Using the measured value of relative pressure sensor as the input variable of processing unit, the water depth value and/or water level value of real-time change at the gas outlet of gas circuit lower end are obtained according to automatic computing unit.
Description
Technical field
The present invention relates to technical field of liquid level measurement, particularly a kind of Pneumatic water pressure measuring device.
Background technology
Measurement monitoring is needed to water levels such as channel, reservoirs in water conservancy and hydropower industry, or in petroleum chemical industry, it is right
The oil level of container is also required to measurement monitoring.General measure water level or oil level are measured by pressure resistance type liquid level sensor, example
As Authorization Notice No. for the Chinese patent of CN2449208Y disclose one kind be immersed in fluid to be measured exportable one with it is tested
Standard electric signal that liquid level is directly proportional and the pressure-resistance type liquid level transmitters for being easy to other instrument or computer networking, pressure sensing
In pedestal 2, water guide first 1 is connected on the one end of pedestal 2 to device 3, and the other end of pedestal 2 is sealed connected together with shell cap 5, amplifying circuit
7 signal input parts weld together with the terminal pin of pressure sensor 3, and its signal output part welds together with cable 12,
And sealed between shell cap 5 and cable 12, protective cover 6 is also equipped with outside amplifying circuit 7.Wherein sensing equipment must be placed directly
In measurement point position, if site environment is more severe, pressure sensing device is easily subjected to broken by lightning, and debris are such as in water in addition
Mud etc. can also block the pressure-sensitive part of sensing equipment, cause measurement inaccurate, and easy care is not changed.
The content of the invention
In order to overcome the drawbacks described above of prior art, the invention provides a kind of Pneumatic water pressure measuring device.
A kind of Pneumatic water pressure measuring device of the invention uses following technical scheme：
A kind of Pneumatic water pressure measuring device, including gas path device, gas path device top are two tracheaes, under two tracheaes
Portion is connected at the top mouth of pipe of a three-way pipeline, and wherein one upper tracheal connects with pressure gas source in two tracheaes
Connect (referred to as " air supply pipe "), another upper tracheal is connected with a relative pressure sensor (referred to as " measurement pipe ")；The threeway
The lower section mouth of pipe of pipeline is arranged at liquid level lower section；When two tracheal strips gassies, by water-stop at the mouth of pipe of lower section；Institute
State wherein air supply pipe side and inject air from pressure gas source toward tracheal strips all the time；The relative pressure sensor of measurement pipe connection can be with
The change of gas pressure intensity is measured in real time；If gas path device external water pressure is higher than tracheal strips air pressure, the air of injection can be detained
In tracheal strips, it is used to keep the rising of air pressure；It is endotracheal unnecessary if gas path device external water pressure is less than tracheal strips air pressure
Air can be discharged by low side opening；By automatically controlling for pressure gas source, endotracheal air pressure is intended to and sealing all the time
Hydraulic pressure keep balance；By the measured value P of relative pressure sensorSurveyAs the input variable of processing unit, according to automatic calculating
Unit obtains the water depth value and/or water level value of real-time change at the gas outlet of gas circuit lower end.
Further, two upper tracheals are connected with a manual three position five-way valve simultaneously, the relative pressure sensing
Device is also connected to the exhaust outlet of the manual three position five-way valve, and the air inlet of manual three position five-way valve is connected with gas in turn by pipeline
Body flow control valve, manual two-position five-way valve, pressure-reducing valve, pressure gas source.
Further, the pressure gas source is air compressor.
A kind of Pneumatic water pressure measuring device of the invention, make use of in the state of the equilibrium, the gas sealed in container
Pressure is equal in magnitude with the external pressure closed to it all the time, and gas pressure intensity transferability principle, from city
Ripe part is combined, and becomes an efficient system, and liquid pressure at measured point is equivalent into sealing container
Gas pressure intensity.With the tracheal strips gas pressure intensity that the change (i.e. the change of the external action pressure of sealing container) of water level is sealed
Change therewith, so that the size for measuring tracheal strips gas pressure intensity can calculate the water depth value at enclosed point, and then obtain water level
Value.
Using the arrangement of gas circuit, alloing sensitive electronic surveying element --- pressure sensor is arranged into versus environmental peace
Full interior.For sensing element, the safety of running environment, can effective extension device service life, and make equipment replacement
Safeguard more convenient.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is depth of water schematic diagram calculation of the invention.
Fig. 2 is of the invention to wash away tracheae pattern diagram；
Fig. 3 is buffer mode schematic diagram of the invention；
Fig. 4 is drying measurement pipe pattern diagram of the invention；
Fig. 5 is normal measurement mode schematic diagram of the invention；
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme to the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this hair
Bright a part of embodiment, rather than whole embodiments.Based on described embodiments of the invention, ordinary skill
The every other embodiment that personnel are obtained on the premise of without creative work, belongs to the scope of protection of the invention.
A kind of Pneumatic water pressure measuring device of the invention, as shown in figure 1, including gas path device, gas path device top is
Two tracheaes, two tracheae bottoms are connected at the top mouth of pipe of a three-way pipeline, are wherein supplied in two tracheaes
Pipe top is connected with pressure gas source, and another measurement pipe top is connected with a relative pressure sensor.Under the three-way pipeline
Square tube mouth is arranged at liquid level lower section.When two tracheal strips gassies, by water-stop at the mouth of pipe of lower section.It is described wherein to supply
Air is injected in tracheae side from pressure gas source toward tracheal strips all the time；The relative pressure sensor of measurement pipe connection can be measured in real time
The change of gas pressure intensity.If gas path device external water pressure is higher than tracheal strips air pressure, the air of injection can be stranded in tracheal strips,
It is used to keep the rising of air pressure；If gas path device external water pressure is less than tracheal strips air pressure, endotracheal additional air can lead to
Discharged at too low end opening.By automatically controlling for pressure gas source, endotracheal air pressure is intended to be protected with the hydraulic pressure of sealing all the time
Maintain an equal level weighing apparatus.
As shown in figure 1, be depth of water schematic diagram calculation of the invention, wherein：
P0:Atmospheric pressure；
PWater:The pressure that water gravity is produced at threeway gas outlet；
PGas:The pressure that weight of air is produced at threeway gas outlet；
PSurvey:Pressure sensor measures pressure (relative to the pressure of atmospheric pressure)；
H:Depth displacement at pressure sensor and gas outlet；
h:Depth displacement at the water surface and gas outlet.
When tracheal strips air pressure and hydraulic pressure are reached under poised state, gas pressure intensity is at threeway gas outlet：PSurvey+P0+PGas, hydraulic pressure
Qiang Wei：PWater+P0
Due in poised state, therefore：PSurvey+P0+PGas=PWater+P0
I.e.：PSurvey+PGas=PWater
I.e.：ρWaterGh=PSurvey+ρGas·g·H
I.e.：
If ignoring the minor way of temperature Change, according to local temperature on average and absolute elevation throughout the year, calculate gravity and add
Speed g, ρWater、P0As constant, H is the difference in height of sensor and measuring point (i.e. at the threeway mouth of pipe) under water, according to actual gas
The mounting arrangements on road obtain constant H；Obtained by the density formula of gas(wherein ρ0=
1.293kg/m3, when temperature is 0 DEG C, pressure is the density of dry air under 1.013MPa states).
By the measured value P of relative pressure sensorSurveyBecome as the input of processing unit by analog quantity or digital quantity signal
Amount, programs according to above formula to processing unit, can obtain the water depth value of real-time change at the gas outlet of gas circuit lower end, such as
Absolute elevation of the fruit plus measuring point (i.e. at the threeway mouth of pipe) under water, it is also possible to obtain water level value.
Further, as shown in Figure 2-5, in a preferred embodiment, two upper tracheals simultaneously with the other hand
Dynamic three position five-way valve connection, the relative pressure sensor is connected to the exhaust outlet of manual three position five-way valve, manual 3 position-5 way
The air inlet of valve is connected with gas flow control valve, manual two-position five-way valve, pressure-reducing valve, pressure gas source in turn by pipeline, excellent
Selection of land, the pressure gas source is air compressor, preferably miniature piston type air compressor machine, with automatic start-stop function, can be long-term
On-line operation reliability.Preferred brand：ALTLAS COPCO (Atlas Copco).
Because the pressure of air compressor gas cylinder is often higher and unstable, therefore, increase a pressure-reducing valve, to pneumatics
The exit gas decompression of machine, pressure is generally adapted to the measured point pressure plus 2bar of maximum.Pressure-reducing valve preferred brand：Bu Lute.
The gas flow control valve can be realized to endlessly supplementing air in gas circuit.Flow control valve can be adjusted
Amount of restriction size, one flow of redundancy of size adjustment according to gas volume in the speed and gas circuit of SEA LEVEL VARIATION.Should protect
Card can in time supply the pressure of gas air in tube due to the rising of hydraulic pressure, ensure that gas is unlikely to excessive waste again.Stream
The flow control valve of the preferred Beijing Po Te Instrument Ltd. manufacture of control valve.
Further, to realize the fortune of rinse mode, buffer mode, drying pattern and the mode of operation of pneumatic air system
OK, the switching for enabling gas circuit flexible, it is special to select one two five logical hand-operated valve and a 3 position-5 way hand-operated valves.First-selected product
Board：German Festo or Taiwan Ya De visitor (AirTAC).
As shown in Fig. 2 rinse mode
The position of two-position five-way valve is adjusted to right position；The position of three position five-way valve is adjusted to middle position；
When needing flushing tracheae pipeline, or first use to need to discharge tracheal strips liquid, gas is directly discharged into confession
Tracheae and measurement pipe, the as needed general operation of the step 20-30 seconds.
As shown in figure 3, buffer mode
The position of two-position five-way valve is adjusted to left position；The position of three position five-way valve is adjusted to middle position；
Finished when tracheae pipeline is rinsed, tracheal strips are buffered with small tolerance, and gas is directly discharged into supply by flow control valve
Pipe and measurement pipe, the step generally require operation 30 seconds.
As shown in figure 4, drying pattern
The position of two-position five-way valve is adjusted to left position；The position of three position five-way valve is adjusted to right position；
Gas by flow control valve enter mode of operation under " measurement pipe ", from mode of operation under " air supply pipe " will press
Force feedback is drying return line to pressure transmitter, which purpose, is run 2 days.
As shown in figure 5, in mode of operation：The position of two-position five-way valve is adjusted to left position, and the position of three position five-way valve is adjusted to
Left position.A constant air pressure is obtained by pressure-reducing valve after gas output in air compressor machine gas cylinder, gas is defeated through two-position five-way valve
Inbound traffics valve, constant air-flow via air supply pipe is input into after three position five-way valve, according to tracheal strips air pressure and the height difference of hydraulic pressure,
The gas of supplement is discharged by threeway lower ending opening or is trapped in tracheal strips and raises intratracheal pressure, reaches the balance of pressure.
By pressure feedback to pressure transmitter, the transmitter measures the pressure of measurement pipe to measurement pipe in real time.
Although it should be understood that with reference to its exemplary embodiment, particularly shown and description is carried out to the present invention,
It should be understood by those skilled in the art that without departing substantially from by spirit of the invention as defined in the claims and model
Under conditions of enclosing, the change of various forms and details can be wherein carried out, any combination of various embodiments can be carried out.
Claims (3)
1. a kind of Pneumatic water pressure measuring device, it is characterised in that including gas path device, gas path device top is two tracheaes,
Two tracheae bottom is connected at the top mouth of pipe of a three-way pipeline, in two tracheaes wherein one upper tracheal with
Pressure gas source connects (referred to as " air supply pipe "), and another upper tracheal is connected with a relative pressure sensor (referred to as " measurement
Pipe ")；The lower section mouth of pipe of the three-way pipeline is arranged at liquid level lower section；When two tracheal strips gassies, lower section threeway
By water-stop at the mouth of pipe；Air is injected in the wherein air supply pipe side from pressure gas source toward tracheal strips all the time；Measurement pipe connection
Relative pressure sensor can in real time measure the change of gas pressure intensity；If gas path device external water pressure is higher than tracheal strips air pressure
When, the air of injection can be stranded in tracheal strips, be used to keep the rising of air pressure；If gas path device external water pressure is less than tracheal strips
During air pressure, endotracheal additional air can be discharged by the threeway mouth of pipe of bottom；By automatically controlling for pressure gas source, tracheae
Interior air pressure is intended to keep balance with the hydraulic pressure of sealing all the time；Using the measured value of relative pressure sensor as processing unit
Input variable, the water depth value and/or water level value of real-time change at the gas outlet of gas circuit lower end are obtained according to automatic computing unit.
2. a kind of Pneumatic water pressure measuring device according to claim 1, it is characterised in that：Two upper tracheals are same
The manual three position five-way valve connections of Shi Yuyi, the relative pressure sensor is also connected to the exhaust outlet of the manual three position five-way valve,
The air inlet of manual three position five-way valve by pipeline be connected with turn gas flow control valve, manual two-position five-way valve, pressure-reducing valve,
Pressure gas source.
3. a kind of Pneumatic water pressure measuring device according to claim 1 and 2, it is characterised in that：The pressure gas source is
Air compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611107336.3A CN106768588A (en) | 2016-12-06 | 2016-12-06 | A kind of Pneumatic water pressure measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611107336.3A CN106768588A (en) | 2016-12-06 | 2016-12-06 | A kind of Pneumatic water pressure measuring device |
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| Publication Number | Publication Date |
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| CN106768588A true CN106768588A (en) | 2017-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201611107336.3A Pending CN106768588A (en) | 2016-12-06 | 2016-12-06 | A kind of Pneumatic water pressure measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462379A (en) * | 2017-09-19 | 2017-12-12 | 合肥通用机械研究院 | A kind of automatic testing equipment of valve leak rate |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5052222A (en) * | 1990-11-05 | 1991-10-01 | Teledyne Exploration | Multiple-unit water depth sensor system |
| CN2175413Y (en) * | 1993-11-05 | 1994-08-24 | 李荣贵 | Observing glass for showing level of liquid |
| CN2261016Y (en) * | 1996-01-22 | 1997-08-27 | 水利部电力工业部机电研究所 | Air-blowing type water-level meter |
| CN101344449A (en) * | 2007-07-10 | 2009-01-14 | 陈镜图 | Pressure test device |
| CN202748095U (en) * | 2012-08-22 | 2013-02-20 | 武汉钢铁(集团)公司 | Liquidometer |
| CN105675252A (en) * | 2015-12-29 | 2016-06-15 | 浙江大学 | Pressure measurement device with liquid level control, composite set and method thereof |
| CN205506293U (en) * | 2016-02-05 | 2016-08-24 | 北京汽车股份有限公司 | Pressure sensor calibration device |
-
2016
- 2016-12-06 CN CN201611107336.3A patent/CN106768588A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5052222A (en) * | 1990-11-05 | 1991-10-01 | Teledyne Exploration | Multiple-unit water depth sensor system |
| CN2175413Y (en) * | 1993-11-05 | 1994-08-24 | 李荣贵 | Observing glass for showing level of liquid |
| CN2261016Y (en) * | 1996-01-22 | 1997-08-27 | 水利部电力工业部机电研究所 | Air-blowing type water-level meter |
| CN101344449A (en) * | 2007-07-10 | 2009-01-14 | 陈镜图 | Pressure test device |
| CN202748095U (en) * | 2012-08-22 | 2013-02-20 | 武汉钢铁(集团)公司 | Liquidometer |
| CN105675252A (en) * | 2015-12-29 | 2016-06-15 | 浙江大学 | Pressure measurement device with liquid level control, composite set and method thereof |
| CN205506293U (en) * | 2016-02-05 | 2016-08-24 | 北京汽车股份有限公司 | Pressure sensor calibration device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462379A (en) * | 2017-09-19 | 2017-12-12 | 合肥通用机械研究院 | A kind of automatic testing equipment of valve leak rate |
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Application publication date: 20170531 |
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