CN104952324B - A kind of Venturi meter experimental provision for possessing synchronous flow digital display - Google Patents
A kind of Venturi meter experimental provision for possessing synchronous flow digital display Download PDFInfo
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- CN104952324B CN104952324B CN201510324385.1A CN201510324385A CN104952324B CN 104952324 B CN104952324 B CN 104952324B CN 201510324385 A CN201510324385 A CN 201510324385A CN 104952324 B CN104952324 B CN 104952324B
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Abstract
The invention discloses a kind of Venturi meter experimental provision for possessing synchronous flow digital display, including：Venturi general style experiment instrument, includes：Venturi general style experiment instrument experimental channel, one section in venturi general style experiment instrument experimental channel is differential flow signal generator for producing pressure difference signal；The high-end liquid gas shift cylinder of pressure difference and pressure difference low side liquid gas shift cylinder being connected with differential flow signal generator；For detecting the differential pressure pickup of the high-end liquid gas shift cylinder compressed air of pressure difference and the pressure difference of pressure difference low side liquid gas shift cylinder compressed air；It is connected with differential pressure pickup, the pressure difference signal for differential pressure pickup to be detected is converted into the micro computer digital display meter of flow.The present invention possesses the flow digital display of teaching efficiency, in optimal technical scheme, moreover it is possible to is returned to zero in real time in normal flow measurement experimentation, is experiment low discharge high-precision flow instrument.
Description
Technical field
The present invention relates to experimental measurement field, and in particular to a kind of Venturi meter experiment for possessing synchronous flow digital display
Device.
Background technology
Venturi meter is so as to calculating liquid in pipe or gas stream by Venturi measuring fluid pressure difference
A kind of device of amount, is that Italian physicist G.B. venturi is invented, therefore named.Venturi tube therein is first to shrink then
The pipeline gradually expanded.The pressure differential at its entrance section and smallest cross-sectional is measured, flow can be obtained with Bernoulli's theorem.
Bernoulli equation is the energy equation of incompressible liquid steady flow, is that hydraulics and hydrodynamics three are important greatly
One of equation.Therefore, venturi general style experiment instrument can train students Venturi meter measurement pipeline flow
Technology, and can further learn the application and calculating of Bernoulli equation.
As the experiment of student's hands-on, wherein a critically important experimental physics measurement parameter is experimental channel
Flow., it is necessary in stability of flow during tradition measure experimental channel flow, (i.e. by manual time-keeping, penetrated with gravimetric method in ozzle
The downstream tank outflow port of stream accesses a water with water drum, and electronic scale conversion of weighing obtains water volume, then divided by during timing
Between can obtain out stream flow) or volumetric method (directly access out flowing water with big graduated cylinder, and with manual time-keeping) go measurement experiment
Pipeline goes out flow, wastes time and energy, and experimental situation, which is also easily done, wet does dirty, flow-measuring method of the student to this quasi-tradition
Experimental teaching purpose is can reach after practising 1~2 time, it is not necessary to which it is traditional to repeat this kind of craft to each hydrodynamic calculations
Measuring method, can by the valuable experimental implementation time of saving preferably for experimental principle probe into in study.Meanwhile tradition
Flow-measuring method also can not measurement experiment in real time pipeline go out 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.Venturi is applied as venturi general style experiment instrument is this kind of
Pipe measures the conventional method of flow, on the one hand needs traditional pressure-measuring pipe connection measurement pressure difference to calculate flow, allows student to understand that it is former
Reason, while also it is necessary to adopt the synchronous flow of digit display in real time of modern measurement technology to compare.And it is used as experiment teaching instrument should
The applied fluid mechanics general principle solves the high-precision of the small-bore experiment tube low discharge of desktop type venturi general style experiment instrument
If spending measurement problem, teaching efficiency can be had more.
On actual market, 15 millimeters of left sides of venturi Comprehensive Experiment instrument experimental channel uniform segment experiment caliber are can be applied to
The right side, the water flow scope 10-300ml/s high-precision flow of digit display measurement apparatus of low discharge, is currently in space state.Religion
Learn and experimentally generally use based on such as traditional weight chronometry or volume chronometry hand dipping.If it is equipped with modern measuring instrument
When, by taking typical differential flow instrument as an example, but there are many problems in experimental teaching application.Differential flow instrument it is differential
Most of flow signal pressure difference caused by signal generator (example venturi, orifice plate etc.) is only 0.1-50 centimeter water columns, and is showed
It is that the pressure tap of sensor and pressure difference signal generator is joined directly together into logical, the pressure of sensor by water pipe communicating pipe to have flow instrument
Power is transmitted by water body, and sensor side is sealing, inside has air barrier, the pressure water post in communicating pipe can not directly be made
With on the pressure chip of sensor, and because the pressure communication channel in sensor is very tiny, thus on liquid gas interface
Very big surface tension is produced, its value can reach 1-5 centimeter water columns, even more greatly, make the pressure error of flow signal up to 10%
More than, low and middle-end flow error can be caused to reach 10%-30%, thus, such flow instrument is not used to the religion of high-precision requirement
Learn on experimental provision；Also have the non-differential flow instrument such as turbine flowmeter of supply pipe with small pipe diameter currently on the market, but at present this
The flow measurement range of type flow meter 1%-2% above precision, it is the 70%-100% of its full scale, is all not below 30%
Applicable, and venturi comprehensive test instrument empirical flow scope is just in less than 30%, so and can not select.
By upper, innovation is carried out to venturi Comprehensive Experiment instrument, develops the corresponding text for possessing synchronous flow digital display
Flowmeter experimental provision is the increasingly urgent demand of current hydrodynamic calculations teaching innovation in mound.
The content of the invention
It is an object of the invention to provide a kind of Venturi meter experimental provision for possessing synchronous flow digital display, preferred
In technical scheme, moreover it is possible to returned to zero in real time in normal flow measurement experimentation, be low voltage difference high-precision flow instrument.
A kind of Venturi meter experimental provision for possessing synchronous flow digital display, including：
Venturi general style experiment instrument, includes：Venturi general style experiment instrument experimental channel, described venturi synthesis
One section in type experiment instrument experimental channel is differential flow signal generator for producing pressure difference signal；
The high-end liquid gas shift cylinder of pressure difference and pressure difference low side liquid gas shift being connected with the differential flow signal generator
Tin, a deflating valve is respectively provided with the high-end liquid gas shift cylinder of described pressure difference and pressure difference low side liquid gas shift cylinder, this two deflation
Mouth is externally connected with movable sealing plug；Movable sealing plug is opened, then 2 liquid gas shift cylinders can intake；
Liquid gas shift cylinder and pressure difference low side liquid gas shift cylinder high-end with the pressure difference is tightly connected, for detecting the pressure difference
The differential pressure pickup of high-end liquid gas shift cylinder compressed air and the pressure difference of pressure difference low side liquid gas shift cylinder compressed air；
It is connected with the differential pressure pickup, the pressure difference signal for the differential pressure pickup to be detected is converted into flow
Micro computer digital display meter.
In the present invention, venturi general style experiment instrument refers to《Applied fluid mechanics is tested》(Mao Genhai is edited, high religion
Educate publishing house's publication, 2008-01-01 versions) basic structure of venturi general style experiment instrument introduced in teaching material P48~53 page and
Principle designs.
The venturi general style experiment instrument experimental channel includes one section of Venturi tube, the comprehensive reality of described venturi
Instrument is tested also to include：
Self-loopa supply tank；
Constant pressure water tank, described constant pressure water tank side connect with the self-loopa supply tank, opposite side and the venturi
General style experiment instrument experimental channel connects；
It is arranged in the self-loopa supply tank and is used for the electric control pump to be supplied water to the constant pressure water tank；
It is arranged on the flow control valve of the afterbody of the venturi general style experiment instrument experimental channel；
The afterbody for accepting the venturi general style experiment instrument experimental channel is connected and is used for the self-loopa supply tank
The self-loopa water recovery apparatus of water outlet；
The double-U-shaped multitube being connected with two pressure taps in the venturi general style experiment instrument experimental channel in Venturi tube
Differential manometer.Double-U-shaped multitube pressure difference is calculated as double-U-shaped air-water multitube differential manometer, has 4 surveys to be connected together by one half bend
Pressure pipe, on rack of measuring pressure, and it is furnished with slide rule, the pressure of two pressure taps in Venturi tube can be measured by slide rule reading
Poor head numerical value.
Described Venturi tube is the experiment pipeline section of pipe diameter size change, and specific is first to shrink the pipe then gradually expanded
Road, can be poor by measuring 2 point pressures at its entrance section and smallest cross-sectional, and experimental channel can be obtained with Bernoulli's theorem
Flow.
The present invention has differential flow signal generator, connects that pressure difference is high-end and the independent double-cylinder type of pressure difference low side respectively
Liquid gas shift cylinder, differential pressure pickup and micro computer digital display meter.Micro computer digital display meter (i.e. equipped with intelligent digital display voltmeter), energy
The method that can be fitted the signal voltage of input by array is realized, output is changed into corresponding flow magnitude of physical quantity digital display defeated
Go out.Measurement accuracy is improved using liquid gas shift cylinder, is a kind of high-accuracy flowrate measuring tool of low voltage difference.
Described differential flow signal generator is the flow measurement pipeline section that can produce pressure difference signal.Differential flow letter
Number generator can use venturi, ozzle, orifice-plate type etc. to write several hydrodynamics measurement flow of textbook over 100 years
Substantially differential front end measurement structure, venturi general style experiment instrument of the present invention in experimental channel itself because be designed with venturi
Pipe tests pipeline section, therefore the preferably Venturi tube experiment tube section is as differential flow signal generator.
Preferably, described differential flow signal generator is provided with pressure difference high side pressure conducting tube and pressure difference low side
Pressure transmission pipe, the pressure difference high side pressure conducting tube are located at the caliber maximum of the Venturi tube, the pressure difference low side pressure
Power conducting tube is located at the caliber minimum of the Venturi tube；
The high-end liquid gas shift cylinder of described pressure difference is provided with the water inlet connected with the pressure difference high side pressure conducting tube；
Described pressure difference low side liquid gas shift cylinder is provided with the water inlet connected with the pressure difference low side pressure transmission pipe.
Further preferably, the water inlet of the high-end liquid gas shift cylinder of described pressure difference is located at the high-end liquid gas shift cylinder of the pressure difference
Sidewall bottom；
The water inlet of described pressure difference low side liquid gas shift cylinder is located at the sidewall bottom of the pressure difference low side liquid gas shift cylinder.
Further preferably, the deflating valve of the high-end liquid gas shift cylinder of described pressure difference is arranged on the high-end liquid gas shift of the pressure difference
The side wall of cylinder and the water inlet for being higher than the described high-end liquid gas shift cylinder of pressure difference；
The deflating valve of described pressure difference low side liquid gas shift cylinder is arranged on the side wall of the pressure difference low side liquid gas shift cylinder simultaneously
Higher than the water inlet of described pressure difference low side liquid gas shift cylinder.
Preferably, it is respectively provided with a gas on the high-end liquid gas shift cylinder of described pressure difference and pressure difference low side liquid gas shift cylinder
Mouth, the valve of the high-end liquid gas shift cylinder of described pressure difference are the connection of the described high-end liquid gas shift cylinder of pressure difference and differential pressure pickup
Interface, the valve of described pressure difference low side liquid gas shift cylinder are the company of described pressure difference low side liquid gas shift cylinder and differential pressure pickup
Connection interface；
The valve of the high-end liquid gas shift cylinder of described pressure difference is higher than the deflating valve of the described high-end liquid gas shift cylinder of pressure difference；
The valve of described pressure difference low side liquid gas shift cylinder is higher than the deflating valve of described pressure difference low side liquid gas shift cylinder.
Further preferably, the deflating valve of the high-end liquid gas shift cylinder of described pressure difference and described pressure difference low side liquid gas shift cylinder
Deflating valve it is contour.
Further preferably, the described Venturi meter experimental provision for possessing synchronous flow digital display, in addition to：Pressure difference is high
Hold the control of electric control valve, pressure difference low side electric control valve and the high-end electric control valve of the control pressure difference and pressure difference low side electric control valve
Circuit processed；
The high-end electric control valve of described pressure difference is connected on the described high-end liquid gas shift cylinder of pressure difference and is connected with differential pressure pickup
Between in gas circuit；Described pressure difference low side electric control valve is connected on described pressure difference low side liquid gas shift cylinder and connected with differential pressure pickup
Between connecing in gas circuit；
The high-end electric control valve of described pressure difference comprises at least three tunnels, the high-end electric control valve of described pressure difference all the way with it is described
The valve connection of the high-end liquid gas shift cylinder of pressure difference, the another way of the high-end electric control valve of described pressure difference and the differential pressure pickup the
One measurement mouth connection, is also turned on air all the way；
Described pressure difference low side electric control valve comprises at least three tunnels, described pressure difference low side electric control valve all the way with it is described
The valve connection of pressure difference low side liquid gas shift cylinder, the another way of described pressure difference low side electric control valve and the differential pressure pickup the
Two measurement mouth connections, are also turned on air all the way.
When the high-end electric control valve of pressure difference and pressure difference low side electric control valve are powered so that the pressure measurement end of differential pressure pickup with
Air turns on, and can return to zero in real time.
Compared with prior art, the invention has the advantages that：
1st, the present invention possesses the ingenious applied fluid mechanics principle solution of Venturi meter experimental provision of synchronous flow digital display
Certainly problem is measured during the high-precision real of the small-bore experiment tube low discharge of venturi general style experiment instrument：Double-cylinder type liquid gas is devised to turn
Changing device, the mode of pressure will be directly transmitted between flow signal generator and sensor by the liquid in communicating pipe, pass through liquid
The bitubular of gas shift, is changed into the medium of gas, sends pressure to sensor, completely eliminates on sensor connecting path
Surface tension effects, make the precision of low discharge can bring up to 1% by 10%, and have filled up as venturi general style experiment instrument is such
The high-precision digital-display flow instrument blank of desktop type miniature fluid Experiments of Machanics instrument；
2nd, this experimental provision is because the pressure transmission medium of high precision sensor is air, thus makes cell pressure chip remote
From water or corrosivity hydraulic fluid so that sensor service life greatly improves；
3rd, the differential flow signal generator of venturi that this experimental provision is configured, is to write to teach in the last hundred years for a long time
The flowmeter of the conventional fluid mechanics principle application of book.Experimental teaching is introduced, there are good theoretical connected applications to student
Practise effect；
4th, this experimental provision cleverly applies automatically controlled miniature Standard Valve Design gas circuit to lead to after using liquid gas shift pressure measurement cylinder
Disconnected switching system, all logical air of 2 pressure measurement interfaces of differential pressure pickup can be made at any time, venturi general style experiment instrument can be made in reality
Real-time, tunable zero during testing, avoiding traditional instrument when needing to detect zero point during measuring must fully closed flow valve ability
The trouble verified, this real-time detection function are especially necessary in teaching experiment.
5th, micro computer digital display meter (the flow of digit display electrical measuring instrument i.e. with microcomputer chip) is configured with, can be by flow simulation voltage
Real-time flow data is changed into by chip modulus non-linear conversion, digital display is shown, intuitive and convenient；The venturi pressure measurement surveyed with traditional hand
Pipe method compares, and while Students ' Learning modern measurement technology is allowed, has more deepened the grasp of Fluid Mechanics knowwhy
Study.
Brief description of the drawings
Fig. 1 is the structural representation for the Venturi meter experimental provision that the present invention possesses synchronous flow digital display；
Fig. 2 is the structural representation of double-cylinder type high-precision flow digital display instrument in the present invention；
Fig. 3 is the circuit diagram of the high-end electric control valve of pressure difference of the present invention, pressure difference low side electric control valve and control circuit.
Embodiment
As shown in figure 1, a kind of Venturi meter experimental provision for possessing synchronous flow digital display, including：Venturi integrates
Type experiment instrument and double-cylinder type high-precision flow digital display instrument 14.
Wherein venturi general style experiment instrument refers to《Applied fluid mechanics is tested》(Mao Genhai is edited, Higher education publishing
Society publishes) basic structure of venturi general style experiment instrument introduced in teaching material P48~53 page, as shown in figure 1, venturi integrates
Type experiment instrument, includes：Venturi general style experiment instrument experimental channel 8, venturi general style experiment instrument experimental channel 8 include
One section of Venturi tube 9, one section (i.e. Venturi tube 9) in venturi general style experiment instrument experimental channel 8 are for producing pressure difference
The differential flow signal generator 41 of signal；Self-loopa supply tank 3；Constant pressure water tank 5, constant pressure water tank 5 are placed on desk 4,
Bottom surface is connected with self-loopa supply tank 3 by upper and lower water pipe, and opposite side connects with venturi general style experiment instrument experimental channel 8；
The stabilier 7 and overflow plate 6 being arranged in constant pressure water tank 5, stabilier 7 are provided with current stabilization hole；It is arranged in self-loopa supply tank 3
And the electric control pump for being supplied water to constant pressure water tank 5；Venturi general style experiment instrument experimental channel 8 is arranged on away from constant pressure water tank
The flow control valve 11 of the afterbody of 5 sides；It is connected with self-loopa supply tank 3 and for accepting the experiment of venturi general style experiment instrument
The afterbody of pipeline 8 exports the self-loopa water recovery apparatus 13 of 12 water outlets；With venturi in venturi general style experiment instrument experimental channel 8
1., 2. double-U-shaped air-water multitube differential manometer 10 that two pressure taps on pipe 9 connect, there are 4 and connected together by one half bend
Pressure-measuring pipe, on rack of measuring pressure, and be furnished with slide rule, two pressure measurement in Venturi tube 9 can be measured by slide rule reading
The pressure difference head numerical value of point 1., 2..
Venturi tube 9 is first to shrink the pipeline then gradually expanded, can be by measuring its entrance section and smallest cross-sectional
2 point pressures at place are poor, and experimental channel flow can be obtained with Bernoulli's theorem.
The course of work of venturi general style experiment instrument is：Open electric control pump to supply water to constant pressure water tank 5, and keep overflowing
Flowing, under water supply constant pressure head, water body flows through venturi general style experiment instrument experimental channel 8 and is connected on the Venturi tube 9 of the inside,
Flow in Flow-rate adjustment valve regulation experimental channel, pass through full packages in double-U-shaped 10 measurable Venturi tube 9 of air-water multitube differential manometer
2 pressure tap pressure difference heads of stream, so as to convert to obtain flow by Bernoulli equation.
As shown in figure 1, possesses the Venturi meter experimental provision of synchronous flow digital display for the present invention, as shown in Fig. 2 should
Double-cylinder type high-precision flow digital display instrument 14 includes the differential flow signal generator 41 for producing pressure difference signal；With pressure difference
The high-end liquid gas shift cylinder 44 of pressure difference and pressure difference low side liquid gas shift cylinder 48 that formula flow signal generator 41 connects, the high-end liquid of pressure difference
A deflating valve 43 is respectively provided with gas shift cylinder 44 and pressure difference low side liquid gas shift cylinder 48；Liquid gas shift cylinder 44 high-end with pressure difference and
Pressure difference low side liquid gas shift cylinder 48 connects, for detecting the high-end compressed air of liquid gas shift cylinder 44 of pressure difference and pressure difference low side liquid gas
The differential pressure pickup 46 of the pressure difference of the compressed air of changeover bobbin 48；It is connected with differential pressure pickup 46, for by differential pressure pickup 46
The pressure difference signal detected is converted into the micro computer digital display meter 50 of flow.
Double-cylinder type high-precision flow digital display instrument 14, in addition to：The high-end electric control valve 51 of pressure difference, pressure difference low side electric control valve 52
And the control circuit of the high-end electric control valve 51 of control pressure difference and pressure difference low side electric control valve 52.The high-end electric control valve 51 of pressure difference to
Include three tunnels less, the high-end electric control valve 51 of pressure difference connects with the high-end compressed air of liquid gas shift cylinder 44 of pressure difference all the way, pressure difference
The another way of high-end electric control valve 51 is connected with differential pressure pickup 46, is also turned on all the way with air.Pressure difference low side electric control valve
52 comprise at least three tunnels, and pressure difference low side electric control valve 52 connects with the compressed air of pressure difference low side liquid gas shift cylinder 48 all the way,
The another way of pressure difference low side electric control valve 48 is connected with differential pressure pickup 46, is also turned on all the way with air.
As shown in figure 3, control circuit includes power supply and by pass 53 is opened up, connect by the positive pole for opening up 53 one end of pass and power supply
Connect, the positive pole of other end electric control valve 51 high-end with pressure difference and the positive pole of pressure difference low side electric control valve 52 are connected, the high-end electricity of pressure difference
The negative pole of air control valve 51 and the connection of the negative pole of the negative pole of pressure difference low side electric control valve 52 and power supply.
Differential flow signal generator 41 is the flow measurement pipeline section that can produce pressure difference signal.Specifically use this self-loopa
In venturi experiment instrument experimental channel pressure tap 5.~8. between one section of Venturi tube 9 test pipeline section.
The maximum inner diameter tube wall that Venturi tube 9 on differential flow signal generator 41 tests pipeline section is provided with pressure difference height
Pressure difference low side pressure transmission pipe is provided with end pressure conducting tube and contraction section minimum diameter.
The high-end liquid gas shift cylinder 44 of pressure difference and pressure difference low side liquid gas shift cylinder 48 are respectively provided with a water inlet 45, and pressure difference is high-end
Water inlet on liquid gas shift cylinder 44 connects with pressure difference high side pressure conducting tube；Water inlet on pressure difference low side liquid gas shift cylinder 48
Connected with pressure difference low side pressure transmission pipe.The water inlet of the high-end liquid gas shift cylinder 44 of pressure difference is located at the high-end liquid gas shift cylinder 44 of pressure difference
Sidewall bottom；The water inlet of pressure difference low side liquid gas shift cylinder 48 is located at the sidewall bottom of pressure difference low side liquid gas shift cylinder 48.
The deflating valve of the high-end liquid gas shift cylinder 44 of pressure difference is arranged on the side wall of the high-end liquid gas shift cylinder 44 of pressure difference and higher than pressure
The water inlet of the high-end liquid gas shift cylinder 44 of difference；The deflating valve of pressure difference low side liquid gas shift cylinder 48 is arranged on pressure difference low side liquid gas shift
The side wall of cylinder 48 and the water inlet for being higher than pressure difference low side liquid gas shift cylinder 48.
A valve 42 is respectively provided with the high-end liquid gas shift cylinder 44 of pressure difference and pressure difference low side liquid gas shift cylinder 48, pressure difference is high-end
The valve electric control valve 51 high-end with pressure difference of liquid gas shift cylinder 44 is connected, and the valve of pressure difference low side liquid gas shift cylinder 48 is low with pressure difference
End electric control valve 52 connects.
The valve of the high-end liquid gas shift cylinder 44 of pressure difference is higher than the deflating valve of the high-end liquid gas shift cylinder 44 of pressure difference；Pressure difference low side liquid
The valve of gas shift cylinder 48 is higher than the deflating valve of pressure difference low side liquid gas shift cylinder 48；The deflating valve of the high-end liquid gas shift cylinder 44 of pressure difference
It is contour with the deflating valve of pressure difference low side liquid gas shift cylinder 48.
Double-cylinder type high-precision liquid flow instrument in the present invention, there is differential flow signal generator 41, in real time zeroing
Electric control valve unit and its control circuit (the i.e. high-end electric control valve 51 of pressure difference, pressure difference low side electric control valve 52 and control pressure difference
The control circuit of high-end electric control valve 51 and pressure difference low side electric control valve 52), it is high-end only with pressure difference low side that pressure difference is connected respectively
Vertical double-cylinder type liquid gas shift cylinder 44 and 48, differential pressure pickup 46 and micro computer digital display meter 50.
Embodiment is further described below：
1st, the bottom of the bitubular is respectively provided with water inlet 45, and the height pressure side with differential flow instrument signal generator 41 respectively
Pressure tap (being respectively equipped with pressure difference high side pressure conducting tube and pressure difference low side pressure transmission pipe) be connected, top is respectively provided with valve
42, respectively the pressure measurement mouth with differential pressure pickup 46 be connected, deflating valve 43 is provided with the elevation such as middle part respectively, deflating valve 43 can be put
Gas makes liquid level highest in cylinder be raised to the position of deflating valve 43.When deflating valve 43 is closed, water pipe communicating pipe 47 is full of continuous bubble-free
Pressure water body when, the press water of high low side pressure tap is converted into gas pressure by the bitubular, and is respectively acting on pressure difference sensing
The height pressure side of device 46, it is gas to make the pressure transmission medium in differential pressure pickup 46 and its gas circuit connecting pipe 49.Due to pressure
Exist in gap sensor 46 and gas circuit connecting pipe 49 without water body, thus also completely eliminate that sensor conventional method connected it is logical
Surface tension effects on road, make the precision of low discharge can bring up to 1% by 10%., need to be by deflating valve 43 when measuring beginning
(can specifically use bleed screw mouth, bleed screw mouth is connected with movable sealing plug) opens exhaust, until the mouthpiece of deflating valve 43 has
Water body flows out, and liquid level in cylinder is no longer increased, this operation should be all carried out respectively to the bitubular, due to the deflating valve 43 of each
In on same elevation, therefore in cylinder after being vented feed liquor, liquid level can keep same level (with edge on deflating valve 43
Same level face), now, if full-section pipe-flow flow is zero in venturi general style experiment instrument experimental channel 8, in two pressure measurement cylinders
Air pressure it is equal, returned to zero using traditional sensor, compensation circuit is initially returned to zero to differential pressure pickup.
2nd, (i.e. the high-end electric control valve 51 of pressure difference, pressure difference low side are automatically controlled for zeroing electric control valve unit and its control circuit in real time
Air valve 52 and the control circuit of the high-end electric control valve 51 of control pressure difference and pressure difference low side electric control valve 52) it is in differential pressure pickup
On the pipeline of the gas circuit connecting pipe 49 of 46 pressure measurement mouths, one or more automatically controlled three-way air valves are connected to, an automatically controlled three-way air valve can
Combined and replaced using two automatically controlled two breather valves and threeway, and have control circuit, realize what differential pressure pickup 46 returned to zero in real time
Electric control function.By the high-end electric control valve 51 of pressure difference, pressure difference low side electric control valve 52 use automatically controlled three-way air valve exemplified by, as Fig. 2,
Shown in Fig. 3.The common port of the high-end electric control valve 51 of pressure difference (automatically controlled three-way air valve) is connected with the high-pressure side of differential pressure pickup 46,
Normally opened end is connected with the valve of the high-end liquid gas shift cylinder 44 of pressure difference；The public affairs of pressure difference low side electric control valve 52 (automatically controlled three-way air valve)
End is connected with the low-pressure end of differential pressure pickup 46 altogether, normally opened end is connected with the valve of pressure difference low side liquid gas shift cylinder 48；Fig. 3
Real-time zeroing electric control valve unit electrical control circuit schematic diagram, when by open up close 53 and press when, the high-end electric control valve 51 of pressure difference (electricity
Control three-way air valve) it is powered with pressure difference low side electric control valve 52 (automatically controlled three-way air valve), liquid gas shift cylinder 44 high-end with pressure difference and pressure
The connected normally opened end of the valve of poor low side liquid gas shift cylinder 48 is closed, and logical atmosphere end is connected with common port, and then pressure difference passes
The both ends of sensor 46 lead to air, and now flow indication value should be zero, if not zero, then it is adjustable as zero.This function is the bitubular
Formula high-precision liquid flow instrument provides an effect returned to zero in real time, avoids tradition instrument when needing to detect zero point during measuring
Device must the trouble that could be verified of fully closed flow valve, this real-time detection function is especially that have very much must in teaching experiment
Want.
3rd, differential pressure pickup 46 is connected to traditional sensor zeroing compensation circuit, can use prior art, can realize pressure difference
It is zero that sensor 46, which inputs pressure difference signal, and when output voltage is not zero, compensating approach is the function of no-voltage output.Traditional
Sensor zeroing compensation circuit cardinal principle is to utilize potentiometer change sensor to export the magnitude of voltage to intellect digital display, is made micro-
The signal negative terminal voltage that computer digital display table receives can be adjusted, so that the show value of micro computer digital display meter 50, is adjustable as
Zero.
The digital display voltmeter (i.e. micro computer digital display meter 50) of the 4th, intelligent (with microcomputer chip), its function,
The method that can be fitted the signal voltage of input by array can be realized, output is changed into corresponding flow magnitude of physical quantity.It is this
Micro computer digital display meter 5 is conventional commercial instrument, and easily buying, can use prior art.
Claims (8)
- A kind of 1. Venturi meter experimental provision for possessing synchronous flow digital display, it is characterised in that including：Venturi general style experiment instrument, includes：Venturi general style experiment instrument experimental channel, the comprehensive reality of described venturi One section tested in instrument experimental channel is the differential flow signal generator for producing pressure difference signal；The high-end liquid gas shift cylinder of pressure difference and pressure difference low side liquid gas shift cylinder being connected with the differential flow signal generator, institute A deflating valve is respectively provided with the high-end liquid gas shift cylinder of pressure difference and pressure difference low side liquid gas shift cylinder stated, is connected outside two deflating valves It is connected to movable sealing plug；Liquid gas shift cylinder and pressure difference low side liquid gas shift cylinder high-end with the pressure difference is tightly connected, high-end for detecting the pressure difference The differential pressure pickup of liquid gas shift cylinder compressed air and the pressure difference of pressure difference low side liquid gas shift cylinder compressed air；It is high-end automatically controlled that pressure difference is in series with connection gas circuit between the high-end liquid gas shift cylinder of pressure difference and the differential pressure pickup Air valve, the high-end electric control valve of pressure difference comprise at least three tunnels, and the valve with the high-end liquid gas shift cylinder of the pressure difference connects all the way, Another way is connected with the differential pressure pickup first measurement mouth, is also turned on all the way with air；It is automatically controlled that pressure difference low side is in series with connection gas circuit between the pressure difference low side liquid gas shift cylinder and the differential pressure pickup Air valve, the pressure difference low side electric control valve comprise at least three tunnels, and the valve with the pressure difference low side liquid gas shift cylinder connects all the way, Another way is connected with the differential pressure pickup second measurement mouth, is also turned on all the way with air；It is connected with the differential pressure pickup, the pressure difference signal for the differential pressure pickup to be detected is converted into micro- electricity of flow Brain digital display meter.
- 2. the Venturi meter experimental provision according to claim 1 for possessing synchronous flow digital display, it is characterised in that institute The differential flow signal generator stated is provided with pressure difference high side pressure conducting tube and pressure difference low side pressure transmission pipe, the pressure difference High side pressure conducting tube is located at the caliber maximum of the Venturi tube of the venturi general style experiment instrument experimental channel, the pressure Poor low side pressure transmission pipe is located at the caliber minimum of the Venturi tube；The high-end liquid gas shift cylinder of described pressure difference is provided with the water inlet connected with the pressure difference high side pressure conducting tube；Described pressure difference low side liquid gas shift cylinder is provided with the water inlet connected with the pressure difference low side pressure transmission pipe.
- 3. the Venturi meter experimental provision according to claim 2 for possessing synchronous flow digital display, it is characterised in that institute The water inlet for the high-end liquid gas shift cylinder of pressure difference stated is located at the sidewall bottom of the high-end liquid gas shift cylinder of the pressure difference；The water inlet of described pressure difference low side liquid gas shift cylinder is located at the sidewall bottom of the pressure difference low side liquid gas shift cylinder.
- 4. the Venturi meter experimental provision according to claim 2 for possessing synchronous flow digital display, it is characterised in that institute The deflating valve for the high-end liquid gas shift cylinder of pressure difference stated is arranged on the side wall of the high-end liquid gas shift cylinder of the pressure difference and higher than described The water inlet of the high-end liquid gas shift cylinder of pressure difference；The deflating valve of described pressure difference low side liquid gas shift cylinder is arranged on the side wall of the pressure difference low side liquid gas shift cylinder and is higher than The water inlet of described pressure difference low side liquid gas shift cylinder.
- 5. the Venturi meter experimental provision according to claim 1 for possessing synchronous flow digital display, it is characterised in that institute A valve, the high-end liquid gas of described pressure difference are respectively provided with the high-end liquid gas shift cylinder of pressure difference and pressure difference low side liquid gas shift cylinder stated The valve of changeover bobbin be the described high-end liquid gas shift cylinder of pressure difference and differential pressure pickup connecting interface, described pressure difference low side liquid The valve of gas shift cylinder is the connecting interface of described pressure difference low side liquid gas shift cylinder and differential pressure pickup；The valve of the high-end liquid gas shift cylinder of described pressure difference is higher than the deflating valve of the described high-end liquid gas shift cylinder of pressure difference；The valve of described pressure difference low side liquid gas shift cylinder is higher than the deflating valve of described pressure difference low side liquid gas shift cylinder.
- 6. the Venturi meter experimental provision according to claim 5 for possessing synchronous flow digital display, it is characterised in that institute The deflating valve of the deflating valve for the high-end liquid gas shift cylinder of pressure difference stated and described pressure difference low side liquid gas shift cylinder is contour.
- 7. the Venturi meter experimental provision according to claim 1 for possessing synchronous flow digital display, it is characterised in that institute State venturi general style experiment instrument experimental channel and include one section of Venturi tube, described venturi general style experiment instrument also includes Have：Self-loopa supply tank；Constant pressure water tank, described constant pressure water tank side connect with the self-loopa supply tank, and opposite side integrates with the venturi Type experiment instrument experimental channel connects；It is arranged in the self-loopa supply tank and is used for the electric control pump to be supplied water to the constant pressure water tank；It is arranged on the flow control valve of the afterbody of the venturi general style experiment instrument experimental channel；The afterbody water outlet for accepting the venturi general style experiment instrument experimental channel is connected and is used for the self-loopa supply tank Self-loopa water recovery apparatus；The double-U-shaped multitube pressure difference being connected with two pressure taps in the venturi general style experiment instrument experimental channel in Venturi tube Meter.
- 8. the Venturi meter experimental provision according to claim 7 for possessing synchronous flow digital display, it is characterised in that institute The Venturi tube stated is the experiment pipeline section of pipe diameter size change.
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| CN201510324385.1A CN104952324B (en) | 2015-06-12 | 2015-06-12 | A kind of Venturi meter experimental provision for possessing synchronous flow digital display |
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| CN201510324385.1A CN104952324B (en) | 2015-06-12 | 2015-06-12 | A kind of Venturi meter experimental provision for possessing synchronous flow digital display |
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| CN104952324B true CN104952324B (en) | 2018-01-02 |
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| CN105590538B (en) * | 2016-02-27 | 2017-07-14 | 山东大学（威海） | A kind of gas flow measurement experimental provision |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3122803A1 (en) * | 1981-06-09 | 1983-01-05 | Dietmar 3300 Braunschweig Brüsch | Model for illustrating the operation of a carburettor |
| CN101191738A (en) * | 2006-12-02 | 2008-06-04 | 刘志壮 | Differential pressure type liquid flowmeter |
| CN201307043Y (en) * | 2008-08-29 | 2009-09-09 | 西南交通大学 | Hydrostatic pressure and vacuum device |
| CN202281632U (en) * | 2011-11-03 | 2012-06-20 | 北京昊科航科技有限责任公司 | Differential pressure type virtual flowmeter |
| CN204791694U (en) * | 2015-06-12 | 2015-11-18 | 浙江大学 | Venturi meter experimental apparatus that possesses synchronous flow digital display |
-
2015
- 2015-06-12 CN CN201510324385.1A patent/CN104952324B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3122803A1 (en) * | 1981-06-09 | 1983-01-05 | Dietmar 3300 Braunschweig Brüsch | Model for illustrating the operation of a carburettor |
| CN101191738A (en) * | 2006-12-02 | 2008-06-04 | 刘志壮 | Differential pressure type liquid flowmeter |
| CN201307043Y (en) * | 2008-08-29 | 2009-09-09 | 西南交通大学 | Hydrostatic pressure and vacuum device |
| CN202281632U (en) * | 2011-11-03 | 2012-06-20 | 北京昊科航科技有限责任公司 | Differential pressure type virtual flowmeter |
| CN204791694U (en) * | 2015-06-12 | 2015-11-18 | 浙江大学 | Venturi meter experimental apparatus that possesses synchronous flow digital display |
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| CN104952324A (en) | 2015-09-30 |
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