CN104766513B - A kind of pressure signal flow measurement device and flow-measuring method - Google Patents

A kind of pressure signal flow measurement device and flow-measuring method Download PDF

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CN104766513B
CN104766513B CN201510152116.1A CN201510152116A CN104766513B CN 104766513 B CN104766513 B CN 104766513B CN 201510152116 A CN201510152116 A CN 201510152116A CN 104766513 B CN104766513 B CN 104766513B
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pressure
measurement
water tank
gas shift
liquid gas
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CN104766513A (en
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毛欣炜
毛根海
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HANGZHOU YUANLIU TECHNOLOGY Co Ltd
Zhejiang University ZJU
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HANGZHOU YUANLIU TECHNOLOGY Co Ltd
Zhejiang University ZJU
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/06Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
    • G09B23/08Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
    • G09B23/12Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of liquids or gases
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects
    • G01F1/34Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/363Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction with electrical or electro-mechanical indication

Abstract

The invention discloses a kind of pressure signal flow measurement device and high-precision flow-measuring method is carried, the device includes:Take the Experimental Water Tank of head piece out of, the water stabling aperture board that work of intaking is partitioned into inhalant region and steady water workspace is provided with Experimental Water Tank;The liquid gas shift pressure measurement cylinder of steady water workspace in Experimental Water Tank is arranged on, the top of pressure measurement cylinder is communicated with positioning pipe, and the bottom surface of the connection positioning pipe is located at out on the axis horizontal plane of head piece;Differential fluid pressure sensor for detecting the liquid gas shift pressure measurement cylinder compressed air and outside air pressure difference;Pressure difference signal for differential fluid pressure sensor to be detected is converted into out the micro computer of head piece flow.Apparatus of the present invention and method can automatically reset and return to zero in real time, improve accuracy of detection, the momentum testing equipment and aperture and aperture in ozzle experiment instrument and the jet flow of ozzle in accurate measurement hydrodynamics basic experiment can be easily digitized, and with good teaching efficiency.

Description

A kind of pressure signal flow measurement device and flow-measuring method
Technical field
The present invention relates to experimental measurement field, and in particular to a kind of pressure signal flow measurement device and carry high-precision Flow-measuring method.
Background technology
Hydraulics and hydrodynamics are a main specialized core courses of many specialties of engineering and polytechnic universities.Modern hydraulics is to build Stand in experiment, theory, calculate on three big pillars, therefore, experiment is indispensable content in teaching link.Wherein, aperture It is one of important study content of the teaching field with vertical water outflowing jet.The perforate on container vertical wall, fluid flows out by aperture Flow phenomenon orifice outflow, it can determine going out under stream or varying head under head to go out stream that it goes out stream condition, can be stream In entering in air, or flowing into the fluid of same medium.One length is installed on the circumference in aperture and is about orifice diameter 3 ~4 times of short tube, such short tube claims cylindrical outer tube mouth.Ozzle can be divided into shape:Streamlined ozzle, cylindrical outer tube Mouth, conical ozzle.Fluid flows through the short tube, and forms full-section pipe-flow in Outlet Section, and this flow phenomenon is referred to as vertical water outflowing jet.
As hydraulic facilities common in engineering --- aperture ozzle, the important Hydrodynamics in Teaching related to aperture ozzle Experiment just has aperture ozzle experiment and momentum law.The domestic piston type momentum law of this 2 kinds of experiment teaching instruments The aperture ozzle experiment instrument of instrument and Tape movement contact is used by domestic hundreds of universities and colleges for representative, in actual experiment teaching all Need to measure the aperture vertical water outflowing jet flow under multigroup different heads, to verify the hydrodynamics philosophy of correlation.Conventional measurement Needed in the case where head is stablized when determining aperture ozzle flow, with gravimetric method (i.e. by manual time-keeping, the downstream of vertical water outflowing jet in aperture Tank goes out head piece water drum and accesses a water, and electronic scale conversion of weighing obtains water volume, then can be obtained divided by timing time To going out stream flow) or volumetric method (directly access out flowing water with big graduated cylinder, and use manual time-keeping) go to measure going out for aperture ozzle Stream flow, wastes time and energy, experimental situation also easily do it is wet do dirty, student learns 1~2 time to the flow-measuring method of this quasi-tradition Can reach experimental teaching purpose later, it is not necessary to which each hydrodynamic calculations are repeated with the traditional measurement side of this kind of craft Method, easily wastes the valuable experimental implementation time.Meanwhile, traditional flow-measuring method also cannot in real time measure going out for aperture ozzle Stream flow.
With the development of modern measurement technology, the laboratory apparatus in other every profession and trade fields modern measurement technology innovation and Using upper far ahead of hydrodynamics class experiment teaching instrument.And it is this kind of for the experiment of aperture ozzle and momentum law Laboratory apparatus wants to realize that comprehensively digitlization measures the network remote even realized in the future towards MOOC and tests, and the first step will be solved Being how certainly realizes the digitlization real-time measurement of aperture vertical water outflowing jet flow.
And this kind of electric measuring instrument, it is often necessary to real-time check for zero, such as after electronic scale weighing, removing weight can just verify it Zero point, and this instrument zero point quite stable.However, for the flowmeter that pipe stream and water tank go out stream, due to experiment During influenceed by temperature and Fluid Pressure Field, thus zero point is not very stable.Traditional flowmeter is needing zeroing Or when check for zero, generally require to carry out barrier gate in the case of pipe full current, make in-pipe flow transfixion, water Case initial water level can just be carried out when being zero.This can halfway stop experimental implementation for teaching experiment, come back to reality Test in the state of beginning, re-start experiment, it is very inconvenient.Therefore, it is possible in experimentation, it is not necessary to the situation of shutdown Under, zeroing or check for zero are extremely important in real time.
A variety of modern measurements the about pipeline, open channel liquid flow measurement are shown with public technology data on the market to fill Put and patent of invention, but also You nothing preferable for the aperture vertical water outflowing jet flow under desktop type laboratory apparatus low pressure head High-precision digital real-time measurement apparatus.
The content of the invention
The invention provides a kind of pressure signal flow measurement device, in that context it may be convenient to digitize accurate measurement hydrodynamics Momentum testing equipment and aperture and aperture in ozzle experiment instrument and the jet flow of ozzle in basic experiment, and with religion well Learn effect.
A kind of pressure signal flow measurement device, including:
Side cornice goes out the Experimental Water Tank of head piece, be provided with described Experimental Water Tank Experimental Water Tank is divided into water workspace and The weir divider of overflow area, is provided with the steady water that work of intaking is partitioned into inhalant region and steady water workspace in described Experimental Water Tank Orifice plate;
It is arranged on the liquid gas shift pressure measurement cylinder of steady water workspace in the Experimental Water Tank, the bottom of the liquid gas shift pressure measurement cylinder Portion connects with the inner space of the Experimental Water Tank, and the top of the liquid gas shift pressure measurement cylinder is communicated with positioning pipe, the connection The bottom surface of positioning pipe goes out on the axis horizontal plane of head piece described in being located at;
It is connected with liquid gas shift pressure measurement cylinder, it is empty with the external world for detecting the liquid gas shift pressure measurement cylinder compressed air The differential fluid pressure sensor of draught head;
It is connected with the differential fluid pressure sensor, the pressure difference signal for differential fluid pressure sensor to be detected is converted into out The micro computer of head piece flow.
In the present invention, when Experimental Water Tank passes through water pump water-filling, the swing that liquid level has larger fluctuation rises, now pressure measurement cylinder Can equally be intake by bottom water inlet, but by bottom one or more small water inlets current stabilization filtered water inlet, pressure measurement can be made Cylinder water level inside rises very steadily, and pressure measurement cylinder inner air can then run away upwardly through connection positioning pipe, with outside experiment water Water level is raised and higher than pressure measurement cylinder, water level steadily rises the contour connection positioning pipe bottom for touching top in correspondence pressure measurement cylinder in case During plane, pressure measurement cylinder top can close one section of air column cannot be discharged, and now pressure measurement cylinder water level inside is no longer raised, in pressure measurement cylinder Water can flow out from the connection positioning pipe at the top of it and be connected with Experimental Water Tank water body.But due to air has compressibility, but Can be calculated the head height relative error that the hollow air pressure contracting of pressure measurement cylinder brings it is limited (<0.12%), in this way it can be considered that pressure measurement The compressed air pressure of cylinder inner sealing is Water in Water Tanks body phase for aperture and the acting head of ozzle axis horizontal plane.
But when Experimental Water Tank liquid level is higher, liquid level can produce absolute error higher, such as pressure measurement cylinder initial sealing in cylinder Air column height 3cm, during 2 meters of heads of measurement, just has the absolute error of 0.5cm.Aerating resetting means pair can now be passed through Liquid gas shift pressure measurement cylinder aerating resets, i.e., made in liquid gas shift pressure measurement cylinder to liquid gas shift pressure measurement cylinder press-in air by air pump After liquid level declines disengaging connection positioning pipe, then air pump is disconnected, close the pipeline of connection air pump, needless compression air can pass through in cylinder Connection positioning pipe drain upwards, in accurate holding cylinder liquid gas interface with connect positioning pipe bottom surface same level face, with orifice tube Mouth axis same level face.Such aerating can eliminate liquid level in the cylinder that aforementioned air compression strap is come and raise error after resetting, greatly The precision of whole measurement apparatus is improved greatly.
In Experimental Water Tank during fixed level, after electrical measuring instrument measures the acting head pressure based on ozzle and aperture, then With gravimetric method, measure aperture and ozzle goes out flow, can form one group of nominal data.
Physics law according to aperture and ozzle and go out to flow flow formula:
Wherein, QvIt is aperture or vertical water outflowing jet flow, A is aperture ozzle area, H0To act on the axis in aperture and ozzle The head height of horizontal plane, μ is the coefficient related to aperture ozzle necked-down section etc. (for the aperture of same breed laboratory apparatus Although the aperture of ozzle design or ozzle shape size are consistent, because of reality processing error, the μ values of every are all different).
By upper, on a casing vertical sidewall fixed aperture and ozzle penetrate flowing out stream flow only with act on this and go out stream Mouthful acting head it is related, for every fixed orifice only need to one group of Q with the laboratory apparatus of ozzlev-H0Nominal data, i.e., μ values are can determine that, by the micro computer of the nonlinear conversion write-in electrical measuring instrument of the flow formula equation, you can in real time by measuring work For the acting head pressure of aperture ozzle, converted by inside, the LED gauge outfits carried in micro computer show aperture ozzle Real-time traffic.
It is following as currently preferred technical scheme:
A logical air of measurement mouth in described differential fluid pressure sensor, another survey in described differential fluid pressure sensor Amount mouth is tightly connected by conduit with liquid gas shift pressure measurement cylinder, and the automatically controlled zeroing gas communicated with air is connected with the conduit Valve.Automatically controlled zeroing air valve can specifically use automatically controlled three-way air valve.By automatically controlled zeroing Air Valve Control, can be by differential fluid pressure sensor In another measurement mouth also lead to air, at this moment, the measurement of differential pressure pickup 2 mouths logical air simultaneously now can be to fluid pressure difference The pressure difference signal of sensor output is returned to zero in real time.This function provides one in real time for pressure signal flow measurement device The effect of zeroing, it is to avoid when detection zero point is needed during measuring traditional instrument must fully closed flow velocity or flow valve just can enter The trouble of row verification, this real-time detection function is especially necessary in teaching experiment.
Described liquid gas shift pressure measurement cylinder is connected with aerating resetting means, and described aerating resetting means includes:Air pump, institute The exhaust nozzle for stating air pump is connected with liquid gas shift pressure measurement cylinder compressed air.Described air pump and the liquid gas shift pressure measurement Path between cylinder is provided with automatically controlled aerating air valve.Described automatically controlled aerating air valve can specifically use automatically controlled two breather valve.Work as gas Pump is opened, and automatically controlled aerating air valve is opened, and air pump starts and to liquid gas shift pressure measurement cylinder gas injection, in liquid gas shift pressure measurement cylinder under liquid level Drop.After power-off, liquid level automatically restores to the position location of connection positioning pipe in liquid gas shift pressure measurement cylinder.Must be provided with reset dress The reason for putting has two, and one is to find gas at the top of liquid gas shift pressure measurement cylinder sometimes because taking over or sensing in practical probation Micro- gas leakage of device air-channel system causes liquid level to rise, and causes measurement error, such case accidentally to occur in the case where time-out is tested.
If without this resetting means, experimenter must shut down pass water makes liquid in Experimental Water Tank and liquid gas shift pressure measurement cylinder Position is all reduced to below position line, could be tested again.Two is that, when the liquid level of Experimental Water Tank is higher, can make liquid gas shift pressure measurement Liquid level generation 0.5mm's or so is higher in cylinder, generates less than 0.5% zero point error, is answered under Experimental Water Tank high level Position, can eliminate this error, improve experimental precision.
Described goes out head piece for aperture or ozzle.
The bottom surface of described connection positioning pipe is horizontal plane.
Described water stabling aperture board is higher than the weir divider, and described water stabling aperture board separates less than the portion of weir divider height There is multiple rows of steady water hole.
The bottom of inhalant region is provided with water inlet in described Experimental Water Tank, and overflow area is provided with water outlet in described Experimental Water Tank Mouthful.
Described weir divider is provided with spout hole, and stopper is plugged with the spout hole.
Described conduit insert the liquid gas shift pressure measurement cylinder one end be located at the bottom surface of the connection positioning pipe with it is described Between the top surface of liquid gas shift pressure measurement cylinder, and higher than the bottom surface of the connection positioning pipe.
One kind carries high-precision flow-measuring method, and using described pressure signal flow measurement device, the method includes:
1) test initially, Experimental Water Tank is not yet intake, the pressure difference signal to differential fluid pressure sensor output is initially adjusted Zero;
2) Experimental Water Tank water inlet, before needing measurement experiment data on flows into experimental work state, first booster air pump and beats Automatically controlled aerating air valve is opened, by water level pressure in liquid gas shift pressure measurement cylinder less than behind the bottom surface for connecting positioning pipe, you can close air pump With the automatically controlled aerating air valve of closing, the operation that resets is completed;
3) micro computer being read again after the operation that resets, the pressure difference signal that differential fluid pressure sensor is detected is converted into out stream The data of mouth flow, you can be improved the empirical flow data after precision.
Compared with prior art, the invention has the advantages that:
Cleverly coordinate modern measurement technology using the acting head conversion of aperture ozzle, realize the real-time of aperture ozzle Flow detection, realizes aperture and digitizes inspection with the real-time traffic of ozzle first for this kind of experimental teaching quasi-instrument of hydrodynamics Survey, the upgrading even data network for being easy to overall instrument from now on is remotely transmitted, remote web experiment lays the first stone.
By the liquid gas voltage stabilizing switch technology of pressure measurement cylinder, for the measurement of low pressure head within routine 1m on experimental bench, keep away The liquid for having exempted to cause due to there are the minute bubbles for being difficult to empty when liquid is directly contacted with differential pressure pickup airtight connection pipe glues The pressure error of almost 10% rank that stagnant power is brought.The Common fluids differential pressure pickup under 1m heads is substantially increased in low pressure Fluid pressure accuracy of detection under head pressure.
Reference elevation relative to aperture ozzle acting head can be automatically determined by the connection positioning pipe at the top of pressure measurement cylinder, That is elevation zero on the basis of the axis horizontal plane of aperture ozzle.The work of aperture ozzle is will act on by liquid gas shift pressure measurement cylinder again Differential pressure pickup is conducted to by compressed air with head pressure, due to differential pressure pickup measurement be relatively large air pressure pressure By force, thus can direct convenience measure the acting head pressure for acting on aperture ozzle.This ingenious utilization fluid mechanics principle The front end measurement apparatus of design also have good teaching efficiency while DATA REASONING is simple direct.Such as current-stabilizing structure Using, large aperture connection positioning breather pipe principle, the hydrostatic pressure transfer theory of liquid gas shift, aperture ozzle flow rate calculation principle Deng being particularly suitable for the innovative teaching of teaching and experiment equipment.
To liquid gas shift pressure measurement cylinder aerating reset function, can be prevented effectively from real time in actual use, due to for a long time Under experiment, liquid gas shift pressure measurement cylinder top causes liquid level because of adapter or micro- gas leakage of differential fluid pressure sensor connection air-channel system The measurement error that rising is caused, tests again without shutting down pass water;Secondly, coordinate special measuring method, air pressure can be eliminated Liquid level exceedes the connection positioning pipe bottom surface i.e. zero elevation of aperture ozzle axis horizontal plane in it and positions in the pressure measurement cylinder that contracting brings Error, improves final empirical flow certainty of measurement.
Real-time zeroing function provides an effect for zeroing in real time for pressure signal flow measurement device of the present invention, it is to avoid When needing to detect zero point during measurement traditional instrument must the trouble that can just be verified of fully closed flow velocity or flow valve, it is this Real-time detection function is especially necessary in teaching experiment.
Brief description of the drawings
Fig. 1 is the structural representation of pressure signal flow measurement device of the present invention.
Specific embodiment
As shown in figure 1, a kind of pressure signal flow measurement device, including:Side cornice goes out the Experimental Water Tank 6 of head piece 7, goes out stream Mouth 7 is aperture or ozzle;It is arranged on the liquid gas shift pressure measurement cylinder 2 in Experimental Water Tank 6, the bottom of liquid gas shift pressure measurement cylinder 2 and reality The bottom surface for testing water tank 6 is fixed, and the bottom of liquid gas shift pressure measurement cylinder 2 is communicated with mouth 1, and for being connected with Experimental Water Tank 6, liquid gas turns The top for changing pressure measurement cylinder 2 is communicated with positioning pipe 5, and the bottom surface of the connection positioning pipe 5 is located at out on the axis horizontal plane 3 of head piece 7, The bottom surface for connecting positioning pipe 5 is horizontal plane;It is connected with liquid gas shift pressure measurement cylinder 2, for detecting compression in liquid gas shift pressure measurement cylinder 2 The differential fluid pressure sensor 10 of air and outside air pressure difference;It is connected with differential fluid pressure sensor 10, for fluid pressure difference to be passed The pressure difference that sensor 10 is detected calculates the micro computer of head piece flow.Electrical measuring instrument 14, including;Differential fluid pressure sensor 10 and with The micro computer of the connection of differential fluid pressure sensor 10, the logical air of measurement mouth in differential fluid pressure sensor 10, fluid pressure difference sensing Another measurement mouthful in device 10 is tightly connected with liquid gas shift pressure measurement cylinder 2.Another measurement mouthful in differential fluid pressure sensor 10 is logical Conduit (hollow pressure conducting tube 12, flexible pipe 9 and breather pipe 4) is crossed to be connected with liquid gas shift pressure measurement cylinder 2, and conduit insertion liquid gas One end of conversion pressure measurement cylinder 2 is located between the top surface of the bottom surface of connection positioning pipe 5 and liquid gas shift pressure measurement cylinder 2, and higher than connection The bottom surface of positioning pipe 5.
The automatically controlled zeroing air valve communicated with air is connected with conduit (hollow pressure conducting tube 12, flexible pipe 9 and breather pipe 4) 26.Automatically controlled zeroing air valve 26 can specifically use automatically controlled three-way air valve.Switched by controlling the gas circuit of automatically controlled three-way air valve, you can real Zeroing function when real.The first via of automatically controlled three-way air valve 26 is connected with the measurement mouth of differential fluid pressure sensor 10 1, automatically controlled three ventilation The tunnel of valve 26 second is tightly connected with liquid gas shift pressure measurement cylinder 2, and the tunnel of automatically controlled three-way air valve 26 the 3rd communicates with air.Real work When, under the unpowered state of automatically controlled three-way air valve 26, the first via of automatically controlled three-way air valve 26 is communicated with the second tunnel, differential fluid pressure sensor 10 normal measurement experiment pressure difference signals;When needing zeroing in real time, automatically controlled three-way air valve 26 is powered, switching gas circuit, the first via and the Three tunnels communicate.2 measurement mouths of differential fluid pressure sensor 10 lead to air simultaneously, and now differential fluid pressure sensor 10 can be exported Pressure difference signal returned to zero in real time.This functional imperative signaling traffic measurement apparatus provides an effect for zeroing in real time, keeps away When having exempted to need to detect zero point during measuring traditional instrument must the trouble that can just be verified of fully closed flow velocity or flow valve, This real-time detection function is especially necessary in teaching experiment.
Liquid gas shift pressure measurement cylinder 2 is connected with aerating resetting means, and aerating resetting means includes:Air pump 25, the row of air pump 25 Valve is connected by connecting tube 23 with liquid gas shift pressure measurement 2 compressed airs of cylinder.Between air pump 25 and liquid gas shift pressure measurement cylinder 2 (i.e. connecting tube 23) is provided with automatically controlled aerating air valve 24 on path.Automatically controlled aerating air valve 24 can specifically use automatically controlled two breather valve.Gas Pump 25 is connected with automatically controlled aerating air valve 24 and liquid gas shift pressure measurement 2 top connecting tubes 23 of cylinder successively.When air pump 25 and automatically controlled Aerating air valve 24 is resetted when pressing logical button and giving power supply with one, and automatically controlled aerating air valve 24 is turned on, and air pump 25 starts and to liquid gas Conversion pressure measurement 2 gas injections of cylinder, liquid level declines in liquid gas shift pressure measurement cylinder 2.After power-off, liquid level is automatically extensive in liquid gas shift pressure measurement cylinder 2 The multiple position location to connection positioning pipe 5.The reason for must be provided with the resetting means has two, and one is that liquid is found in practical probation The gas at the top of gas shift pressure measurement cylinder 2 because adapter or micro- gas leakage of sensor air-channel system cause liquid level to rise, is made sometimes Into measurement error, such case can accidentally occur in the case where time-out is tested.
If without this resetting means, experimenter must shut down pass water to be made in Experimental Water Tank and liquid gas shift pressure measurement cylinder 2 Liquid level is all reduced to below position line, could be tested again.Two is that, when the liquid level 8 of Experimental Water Tank 6 is higher, can survey liquid gas shift Liquid level generation 0.5mm's or so is higher in pressure cylinder 2, generates less than 0.5% zero point error, is answered under water tank high level Position, can eliminate this error, improve experimental precision.
It is provided with Experimental Water Tank 6 and Experimental Water Tank 6 is divided into weir divider 15 into water workspace and overflow area, weir divider 15 are arranged in Experimental Water Tank 6, are fixed on the bottom surface of Experimental Water Tank 6, will be divided into two parts inside Experimental Water Tank 6, and a part is Water inlet workspace, liquid gas shift pressure measurement cylinder 2 is arranged on into water workspace, and the head piece 7 that goes out of Experimental Water Tank 6 is also disposed at into water conservancy project In making area.
The water stabling aperture board 22 that work of intaking is partitioned into inhalant region and steady water workspace is provided with Experimental Water Tank 6, liquid gas turns Change pressure measurement cylinder 2 and be arranged in Experimental Water Tank 6 steady water workspace, water stabling aperture board 22 is higher than weir divider 15, and water stabling aperture board 22 is less than The part of the height of weir divider 15 is provided with multiple rows of steady water hole.
The bottom of inhalant region is provided with water inlet 16 in Experimental Water Tank 6, and overflow area is provided with delivery port 17 in Experimental Water Tank 6.Go out The mouth of a river 17 is arranged on the bottom of overflow area in Experimental Water Tank 6, facilitates draining.
Weir divider 15 is provided with two highly different spout holes, and stopper 18, stopper 19 are plugged with spout hole.Work as needs During adjustment overflow position, can be realized by opening stopper, so as to preferably adjust flood level.
The Experimental Water Tank 6 of measurement of discharge is treated with a fenestrated or vertical water outflowing jet, such Experimental Water Tank on a large scale should With:Generally there is a water inlet 16, one piece of weir divider 15 less than tank height is by water tank internal insulation into 2 parts, water tank Liquid level goes out higher than weir divider 15 i.e. overflow after water inlet, and Experimental Water Tank 6 is flowed out by delivery port 17.In order to obtain multiple overflows Constant water level, this kind of Experimental Water Tank can open up several overflow macropores on weir divider 15 in different height, and with stopper 18, fill in Son 19 is clogged, and the overflow constant water level that different height stopper just can adjust different height is pulled out as needed.Horizontal plane 8 is not pull out Fall overflow constant water level during stopper.
A liquid gas shift pressure measurement cylinder 2 for transparent organic glass material, liquid gas shift pressure measurement cylinder 2 are provided with Experimental Water Tank 6 It is a diameter 5cm or so cylinder, shaft horizontal line in the aperture ozzle (going out head piece 7) of stream is highly gone out higher than Experimental Water Tank 6 3cm, organic seal glass lid, without bottom surface, aperture ozzle is left, distance glue bonding is fixed on the bottom of Experimental Water Tank 6 farther out Face.Pressure measurement cylinder sidewall bottom be provided with semicircle connected entrance 1 (sidewall bottom along bottom one circle can open several small connected entrances more, play Filtering current stabilization water inlet effect, it is ensured that fluid level stabilization rises in cylinder), can be communicated with the water of Experimental Water Tank 6.Liquid gas shift pressure measurement cylinder 2 top seals are inserted with 2 hollow pipes, and a larger hollow pipe in root hole footpath is the connection positioning pipe 5 of lucite material, outer wall with Lid perforate inwall is bonded by glue sealing on liquid gas shift pressure measurement cylinder 2, is vertically connected, and internal diameter is about 5mm, its bottom circle Plane of a loop is smooth, and is flushed with the aperture ozzle axis horizontal plane 3 for going out stream, and upper end outlet is communicated with the water storage space of Experimental Water Tank 6. Another thinner hollow pipe is the hollow stainless steel breather pipe 4 of internal diameter 1.5mm, and the hollow outer wall of stainless steel breather pipe 4 passes through 502 glue and liquid gas shift pressure measurement 2 top perforate inwall hermetic seal adhesions of cylinder, with the interior top for sealing of liquid gas shift pressure measurement cylinder 2 Air column is communicated, and the outer valve protrusion liquid gas shift pressure measurement 2 about 1cm or so of cylinder of cylinder, the PVC transparent that salable overcoat is adapted to internal diameter is soft Pipe connects flexible pipe 9 (i.e. PVC pressure measurement flexible pipe 9) as ventilation pressure measurement, and PVC pressure measurement flexible pipe 9 possesses preferable elasticity, can be tightly it is outer Be enclosed within the outside of stainless steel breather pipe 4, be compared with low pressure in 1.1 times of atmospheric pressures in this experiment, PVC pressure measurement flexible pipe 9 with it is stainless Steel breather pipe 4 can be accomplished to be tightly connected well.PVC pressure measurement flexible pipe 9 is about 80cm, draws the outer other end of Experimental Water Tank 6 tight It is tightly placed on an interface hollow pressure conducting tube 12 of differential fluid pressure sensor 10, differential fluid pressure sensor 10 is relative pressure Sensor, with 2 hollow pressure conducting tubes 11 and 12, hollow pressure conducting tube 11 is communicated with air.
During experiment, desktop level is mixed up, put Experimental Water Tank 6 on the table by water pump from the water-filling of water inlet 16, liquid level Can be swung with undaform and risen, now liquid gas shift pressure measurement cylinder 2 makes liquid by the synchronous current stabilization filtered water inlet of bottom connected entrance 1 Gas shift pressure measurement 2 water level insides of cylinder steadily rise, and 2 inner airs of liquid gas shift pressure measurement cylinder can be upwardly through the connection row of positioning pipe 5 Fall, with outside Experimental Water Tank 6, water level is raised and higher than liquid gas shift pressure measurement cylinder 2, water level in correspondence liquid gas shift pressure measurement cylinder 2 When steadily rising connection 5 baseplane of positioning pipe at the top of contour touching, 2 tops of liquid gas shift pressure measurement cylinder can close one section of air Post cannot be discharged, and now pressure measurement 2 water level insides of cylinder are no longer raised, and water can be determined from the connection at the top of it in liquid gas shift pressure measurement cylinder 2 Outflow is connected with the water body of Experimental Water Tank 6 in the pipe 5 of position.Therefore differential fluid pressure sensor 10 is led to by the hollow stainless steel that gas circuit is connected Tracheae 4, survey be exactly the pressure measurement of liquid gas shift cylinder 2 in the relatively large air pressure of seal compression air column pressure.Differential fluid pressure sensor In the 10 pressure signal feeding micro computers for measuring, after being converted by calibration formula through micro computer inside, microcomputer-recognized intelligent gauge outfit 13 LED screen on show aperture ozzle flow number.
Placed against experiment instrument side, the convenient electrical measuring instrument 14 being connected with pressure measurement PVC pressure measurement flexible pipe 9, electrical measuring instrument 14 includes Differential fluid pressure sensor 10 and the micro computer digital display meter head 13 of programmable storage, the pressure signal that differential pressure pickup 10 is measured can be with It is input in micro computer, is changed through internal A/D, and goes out to flow the Program transformation of flow formula by micro computer inner orifice or ozzle Outflow data are directly displayed in micro computer digital display meter head 13.
During specific implementation, often aperture and ozzle class pressure signal flow measurement device of the set based on acting head are in experiment water Under case stabilization head, one group of Q is to flow detectorv-H0Nominal data, i.e., go out to flow flow formula according to aperture and ozzleThe μ values of every are calculated to calibrate and is come, be stored in the program arrange parameter of micro computer gauge outfit.Mark A μ value fixed constant is determined, you can demarcate a pressure difference signal for Experimental Water Tank and go out the non-linear corresponding of head piece flow Relation, so according to the acting head H for measuring in real time0, you can the aperture in real-time measurement experiment instrument each stage or vertical water outflowing jet Flow.
One kind carries high-precision flow-measuring method, and using above-mentioned pressure signal flow measurement device, the method includes:
1) test initially, Experimental Water Tank 6 is not yet intake, the pressure difference signal to the output of differential fluid pressure sensor 10 is carried out initially Zeroing;
2) Experimental Water Tank 6 is intake, before needing measurement experiment data on flows into experimental work state, the He of first booster air pump 25 Automatically controlled aerating air valve 24 is opened, behind bottom surface of the water level pressure less than connection positioning pipe 5 in liquid gas shift pressure measurement cylinder 2, you can pass Pump 25 of holding one's breath resets and operates with automatically controlled aerating air valve 24, completion is closed;
3) micro computer is read again after the operation that resets to be converted into out the pressure difference signal that differential fluid pressure sensor 10 is detected The data of head piece flow, the display data on flows of micro computer digital display meter head 13, you can be improved the empirical flow data after precision.
Finally it should be noted that:Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and simultaneously The non-restriction to implementation method.For those of ordinary skill in the field, can also do on the basis of the above description Go out the change or variation of other multi-forms.There is no need and unable to be exhaustive to all of implementation method.And thus drawn Obvious change that Shen goes out or among changing still in protection scope of the present invention.

Claims (9)

1. a kind of pressure signal flow measurement device, it is characterised in that including:
Side cornice goes out the Experimental Water Tank of head piece, is provided with described Experimental Water Tank and Experimental Water Tank is divided into water workspace and overflow The weir divider in area, is provided with the steady water hole that work of intaking is partitioned into inhalant region and steady water workspace in described Experimental Water Tank Plate;
Be arranged on the liquid gas shift pressure measurement cylinder of steady water workspace in the Experimental Water Tank, the bottom of liquid gas shift pressure measurement cylinder with The inner space connection of the Experimental Water Tank, the top of the liquid gas shift pressure measurement cylinder is communicated with positioning pipe, connection positioning The bottom surface of pipe goes out on the axis horizontal plane of head piece described in being located at;
It is connected with liquid gas shift pressure measurement cylinder, for detecting the liquid gas shift pressure measurement cylinder compressed air and outside air pressure Poor differential fluid pressure sensor;
It is connected with the differential fluid pressure sensor, the pressure difference signal for differential fluid pressure sensor to be detected is converted into out head piece The micro computer of flow;
Described liquid gas shift pressure measurement cylinder is connected with aerating resetting means, and described aerating resetting means includes:Air pump, the gas The exhaust nozzle of pump is connected with liquid gas shift pressure measurement cylinder compressed air.
2. pressure signal flow measurement device according to claim 1, it is characterised in that described differential fluid pressure sensor In a measurement logical air of mouth, another measurement mouthful in described differential fluid pressure sensor surveyed by conduit with the liquid gas shift Pressure cylinder is tightly connected, and the automatically controlled zeroing air valve communicated with air is connected with the conduit.
3. pressure signal flow measurement device according to claim 1, it is characterised in that described air pump and the liquid gas Path between conversion pressure measurement cylinder is provided with automatically controlled aerating air valve.
4. pressure signal flow measurement device according to claim 1, it is characterised in that the bottom of described connection positioning pipe Face is horizontal plane.
5. pressure signal flow measurement device according to claim 1, it is characterised in that described water stabling aperture board is higher than institute Weir divider is stated, described water stabling aperture board is provided with multiple rows of steady water hole less than the part of weir divider height.
6. pressure signal flow measurement device according to claim 1, it is characterised in that intake in described Experimental Water Tank The bottom in area is provided with water inlet, and overflow area is provided with delivery port in described Experimental Water Tank.
7. pressure signal flow measurement device according to claim 1, it is characterised in that described weir divider is provided with Spout hole, stopper is plugged with the spout hole.
8. pressure signal flow measurement device according to claim 2, it is characterised in that described conduit inserts the liquid One end of gas shift pressure measurement cylinder is located between the bottom surface of the connection positioning pipe and the top surface of liquid gas shift pressure measurement cylinder, and high In the bottom surface of the connection positioning pipe.
9. one kind carries high-precision flow-measuring method, it is characterised in that surveyed using the pressure signal flow described in claim 3 Amount device, the method includes:
1) test initially, Experimental Water Tank is not yet intake, the pressure difference signal to differential fluid pressure sensor output is initially returned to zero;
2) Experimental Water Tank water inlet, before needing measurement experiment data on flows into experimental work state, first booster air pump and opening are electric Control aerating air valve, after water level pressure in liquid gas shift pressure measurement cylinder is less than into the bottom surface of connection positioning pipe, you can close air pump and pass Automatically controlled aerating air valve is closed, the operation that resets is completed;
3) micro computer being read again after the operation that resets, the pressure difference signal that differential fluid pressure sensor is detected is converted into out head piece stream The data of amount, you can be improved the empirical flow data after precision.
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