CN104748801A - Water tank outflow volume measurement device - Google Patents
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- CN104748801A CN104748801A CN201510151339.6A CN201510151339A CN104748801A CN 104748801 A CN104748801 A CN 104748801A CN 201510151339 A CN201510151339 A CN 201510151339A CN 104748801 A CN104748801 A CN 104748801A
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Abstract
The invention discloses a water tank outflow volume measurement device. The water tank outflow volume measurement device comprises an experiment water tank, a liquid-gas conversion pressure measurement cylinder, a fluid differential pressure sensor and a microcomputer, wherein one side wall of the experiment water tank is provided with an outflow port; the liquid-gas conversion pressure measurement cylinder is arranged inside the experiment water tank, the bottom of the liquid-gas conversion pressure measurement cylinder is communicated with the inside space of the experiment water tank, the side wall of the liquid-gas conversion pressure measurement cylinder is provided with a gas outlet water drainage port, and the upper edge of the gas outlet water drainage port is flush with the middle axis horizontal plane of the outflow port; the fluid differential pressure sensor is connected with the liquid-gas conversion pressure measurement cylinder and is used for detecting the differential pressure between compressed air inside the liquid-gas conversion pressure measurement cylinder and external air; the microcomputer is connected with the fluid differential pressure sensor and is used for converting the differential pressure detected by the fluid differential pressure sensor into the outflow of the outflow port. The water tank outflow volume measurement device can conveniently and accurately measure the jet flow volume of orifices in a momentum experiment instrument and orifices and pipe mouths in a pipe mouth experiment instrument in a hydromechanics fundamental experiment in a digitalized mode.
Description
Technical field
The present invention relates to experimental measurement field, particularly a kind of aperture based on acting head and ozzle class water tank go out the flow measurement device of stream.
Background technology
Hydraulics and fluid mechanics are main specialized core courses of the many specialties of engineering and polytechnic universities.Modern hydraulics is based upon experiment, theory, calculates on three large pillars, and therefore, experiment is content indispensable in teaching link.Wherein, aperture and vertical water outflowing jet are one of important learning contents of this teaching field.Perforate on container upright wall, the flow phenomenon that fluid flows out through aperture orifice outflow, its go out stream condition can be determine under head go out stream or varying head under go out stream, can be flow in air, also can be flow in the fluid of same medium.The circumference in aperture is installed the short tube that a length is about orifice diameter 3 ~ 4 times, and such short tube claims cylindrical outer tube mouth.Ozzle can be divided into by its shape: streamlined ozzle, cylindrical outer tube mouth, conical ozzle.Fluid flows through this short tube, and forms full-section pipe-flow at Outlet Section, and this flow phenomenon is called vertical water outflowing jet.
As hydraulic facilities common in engineering---aperture ozzle, the important hydrodynamics teaching experiment relevant to aperture ozzle just has aperture ozzle to test and momentum law.These 2 kinds of experiment teaching instruments domestic with the aperture ozzle experiment instrument of the piston type momentum law tester of patent of invention number and Tape movement contact for representative is adopted by universities and colleges of domestic hundreds of institute, the aperture vertical water outflowing jet flow under the different head of group more than measuring all is needed, to verify relevant fluid mechanics philosophy in actual experiment teaching.Tradition needs under stable head when measuring aperture ozzle flow, (namely manual time-keeping is passed through by gravimetric method, go out head piece water drum at the downstream tank of aperture vertical water outflowing jet and access a water, and obtain water volume with electronic scale weighing conversion, stream flow can be obtained out divided by timing time again) or volumetric method (directly access out flowing water with large graduated cylinder, and with manual time-keeping) remove to measure aperture ozzle go out flow, waste time and energy, experimental situation also easily do wet do dirty, the flow-measuring method study of student to this quasi-tradition can reach experimental teaching object 1 ~ 2 time later, do not need to repeat the traditional measuring method of this kind of craft to each hydrodynamic calculations, the experimental implementation time that easy waste is valuable.Meanwhile, what conventional flow measuring method also cannot measure aperture ozzle in real time goes out flow.
Along with the development of modern measurement technology, the experimental apparatus in other every profession and trade fields on the Innovation and application of modern measurement technology far ahead of fluid mechanics class experiment teaching instrument.And even future, realization was tested towards the network remote of MOOC to want to realize comprehensive digitizing measurement for the experiment of aperture ozzle and this kind of experimental apparatus of momentum law, what the first step will solve is exactly the digitizing real-time measurement how realizing aperture vertical water outflowing jet flow.
A variety of respective ducts, the modern measuring equipment of open channel liquid flow measurement and patent of invention is shown on the market with public technology data, but for the high-precision digital real-time measurement apparatus that also has nothing good of the aperture vertical water outflowing jet flow under desktop type experimental apparatus low pressure head.
Summary of the invention
The invention provides the flow measurement device that a kind of water tank goes out stream, can the jet flow of aperture and ozzle in momentum testing equipment easily in digitizing accurate measurement fluid mechanics basic experiment and aperture and ozzle experiment instrument, and there is good teaching efficiency.
Water tank goes out a flow measurement device for stream, comprising:
Sidewall takes the Experimental Water Tank of head piece out of;
Be arranged on the liquid gas shift pressure measurement cylinder in described Experimental Water Tank, the bottom of described liquid gas shift pressure measurement cylinder is communicated with the inner space of described Experimental Water Tank, the sidewall of described liquid gas shift pressure measurement cylinder is provided with freeing port of giving vent to anger, the upper edge of this freeing port of giving vent to anger with described go out the axis surface level of head piece flush;
Be connected with described liquid gas shift pressure measurement cylinder, for detecting the fluid pressure difference sensor of described liquid gas shift pressure measurement cylinder compressed air and outside air pressure reduction;
Be connected with described fluid pressure difference sensor, the pressure reduction for being detected by fluid pressure difference sensor changes into out the micro computer of head piece flow.
In the present invention, during experiment, Experimental Water Tank is by water pump water-filling, the swing that liquid level has larger fluctuation is risen, now liquid gas shift pressure measurement cylinder (be called for short pressure measurement cylinder) by the water inlet (can be established one or more) of enough flows of bottom together with stepping water, bottom water inlet mode can allow Experimental Water Tank wave water have current stabilization effect, pressure measurement cylinder water level inside can be made to increase very steady.Along with liquid gas shift pressure measurement cylinder water level inside and Experimental Water Tank middle water level synchronously rise, in liquid gas shift pressure measurement cylinder, air can be upwards discharged in the protection straight tube of outside by freeing port of giving vent to anger, is more upwards discharged by protection straight tube.Along with outside Experimental Water Tank middle water level rising and higher than pressure measurement cylinder, in corresponding pressure measurement cylinder water level steadily rise in the contour freeing port of giving vent to anger touching upper portion side wall along time, pressure measurement cylinder top can be closed one section of air column and cannot discharge, and now pressure measurement cylinder water level inside no longer raises.
In the little water tank of this kind of desktop type, due to head not high (being less than 100cm water column), very limited (the <0.12% of the head height error that in pressure measurement cylinder, air compressing brings, can ignore), so the compressed air pressure of pressure measurement cylinder inner sealing is the acting head relative to aperture and ozzle axis surface level of water body in Experimental Water Tank.
But here, an insulation blocking pipe why will be added outside freeing port of giving vent to anger? although water level rising basic synchronization but still have several millimeters of gaps in Experimental Water Tank and pressure measurement cylinder, and because also have surge to swing when Experimental Water Tank middle water level rises, if without insulation blocking pipe, the freeing port of giving vent to anger of pressure measurement cylinder sidewall does not also wait air in cylinder to be emptied to edge on aperture, will be sealed one step ahead by the liquid level that rises in Experimental Water Tank, due to the surface tension overlaying influence of aperture, in pressure measurement cylinder, air column puts in place with regard to being difficult to discharge, the acting head error that this sample liquid gas shift records will be very large, can more than 10% be reached.There is the insulation blocking pipe that this root seals; because bottom inlet opening is very little; in protection tube, liquid level rising lags far behind liquid level ascending velocity in pressure measurement cylinder; therefore be equivalent to give vent to anger freeing port and Experimental Water Tank water body to keep apart and define a unimpeded exhaust passage; ensure that liquid level rises to along front in freeing port of giving vent to anger in pressure measurement cylinder, what in cylinder, air can be unimpeded is discharged by this isolation air flue.And when liquid level in pressure measurement cylinder arrives out edge in freeing port of giving vent to anger, after sealing pressure measurement cylinder upper air post, in pressure measurement cylinder, water flows out by freeing port of giving vent to anger again and communicates with extraneous Experimental Water Tank water body.
Whole experimental provision want measurement of discharge also will through demarcation: after Experimental Water Tank overflow fixed level, by fluid pressure difference sensor and micro computer, the acting head pressure based on ozzle and aperture can be recorded, then use gravimetric method, what record aperture and ozzle goes out flow, just can form one group of nominal data.
According to the physics law of aperture and ozzle with go out to flow flow formula:
Wherein, Q
vfor aperture or vertical water outflowing jet flow, A is aperture ozzle area, H
0for acting on the head height of the axis surface level of aperture and ozzle, μ be the coefficient relevant to aperture ozzle necked-down section etc. (although the aperture designed for the aperture ozzle of same breed experimental apparatus or ozzle shape size consistent, but because of actual mismachining tolerance, the μ value of every platform is all different).
By upper, it is only relevant with acting on this acting head going out head piece that aperture fixing on a casing vertical sidewall and the jet of ozzle go out flow, and the experimental apparatus for every platform fixed orifice and ozzle only needs one group of Q
v-H
0nominal data, can determine μ value, and this flow formula equation is write micro computer by program, in real time by measuring the acting head pressure acting on aperture ozzle, can convert, demonstrate the real-time traffic of aperture ozzle in LED gauge outfit through internal processes.
As preferably, the outer wall of described liquid gas shift pressure measurement cylinder is fixed with the insulation blocking straight tube of freeing port of giving vent to anger described in protection, the bottom of described insulation blocking straight tube is with bottom surface, and with Inlet and outlet water through hole on this bottom surface, the top of described insulation blocking straight tube is empty.The top of described insulation blocking straight tube flushes with the end face of described liquid gas shift pressure measurement cylinder.The periphery of freeing port of giving vent to anger described in described insulation blocking straight tube is arranged on also is fixed on the outer wall of described liquid gas shift pressure measurement cylinder.
As preferably, the described head piece that goes out is aperture or ozzle.
As preferably, the bottom of described liquid gas shift pressure measurement cylinder is provided with the connected entrance communicated with the inner space of described Experimental Water Tank, for being communicated with described Experimental Water Tank.The described bottom of liquid gas shift pressure measurement cylinder and the bottom surface of described Experimental Water Tank are fixed, or the described sidewall of liquid gas shift pressure measurement cylinder and the sidewall of described Experimental Water Tank are fixed.
As preferably, the weir divider be divided into by Experimental Water Tank into water workspace and overflow area is provided with in described Experimental Water Tank, weir divider is arranged in Experimental Water Tank, be fixed on the bottom surface of Experimental Water Tank, Experimental Water Tank inside is divided into two parts, a part is water inlet workspace, and liquid gas shift pressure measurement cylinder is arranged on in water workspace, and the head piece that goes out of Experimental Water Tank is also arranged on in water workspace.
Further preferably, the bottom of the workspace that intakes in described Experimental Water Tank is provided with water inlet, and in described Experimental Water Tank, overflow area is provided with water delivering orifice.The water that water inlet workspace overflows is discharged by water delivering orifice.
Further preferred, described water delivering orifice is arranged on the bottom of overflow area in described Experimental Water Tank, facilitates draining.
Described weir divider is provided with spout hole, is plugged with stopper in this spout hole.When needs adjustment overflow position, realize by opening stopper.Different spout holes can be set on the differing heights of weir divider, thus better adjust flood level.
As preferably, one in described fluid pressure difference sensor is measured mouth and is led to air, and another in described fluid pressure difference sensor is measured mouth and be tightly connected by conduit and described liquid gas shift pressure measurement cylinder.
Further preferably, described conduit inserts one end of described liquid gas shift pressure measurement cylinder between the upper edge of described freeing port of giving vent to anger and the end face of described liquid gas shift pressure measurement cylinder, and higher than the upper edge of described freeing port of giving vent to anger.
Compared with prior art, tool of the present invention has the following advantages:
The conversion of the acting head of aperture ozzle is utilized to coordinate modern measurement technology cleverly, the real-time traffic achieving aperture ozzle detects, this kind of experimental teaching quasi-instrument of fluid mechanics is achieved first to the real-time traffic digital measuring of aperture and ozzle, be convenient to the upgrading even long-range transmission of data network of overall instrument from now on, 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 1m conventional on experiment table, avoid the pressure error of almost 10% rank that the surface tension of liquid that causes owing to there are very difficult emptying minute bubbles when liquid directly contacts with the airtight connecting pipe of fluid pressure difference sensor brings.Substantially increase the fluid pressure accuracy of detection of Common fluids differential pressure pickup under low pressure head pressure under 1m head.
To be given vent to anger the benchmark elevation that freeing port can determine relative to aperture ozzle acting head automatically by the UNICOM on pressure measurement cylinder top location, namely the axis surface level of aperture ozzle is benchmark elevation zero.By liquid gas shift pressure measurement cylinder, the acting head pressure acting on aperture ozzle is conducted to differential pressure pickup by pressurized air again, what measure due to differential pressure pickup is the pressure of relative atmospheric pressure, therefore can direct convenience record the acting head pressure acting on aperture ozzle, then by simple demarcate just by micro computer convert demonstrate aperture ozzle go out flow.This ingenious front end measurement mechanism utilizing fluid mechanics principle to design, simple directly simultaneously in DATA REASONING, also there is good teaching efficiency.The hydrostatic force transfer theory, aperture ozzle flow rate calculation principle etc. of the application of such as current-stabilizing structure, isolation snorkel principle, liquid gas shift, be particularly suitable for the innovative teaching of teaching and experiment equipment.
Accompanying drawing explanation
Fig. 1 is the structural representation that water tank of the present invention goes out the flow measurement device of stream.
Embodiment
As shown in Figure 1, for water tank of the present invention goes out the flow measurement device of stream, comprising: the Experimental Water Tank 7 taking head piece 8 out of; Be arranged on the liquid gas shift pressure measurement cylinder 2 in Experimental Water Tank 7, the bottom of liquid gas shift pressure measurement cylinder 2 is communicated with the inner space of Experimental Water Tank 7, the sidewall of liquid gas shift pressure measurement cylinder 2 is provided with freeing port 5 of giving vent to anger, and the upper edge of this freeing port 5 of giving vent to anger flushes with the axis surface level 20 going out head piece 8; Be connected with liquid gas shift pressure measurement cylinder 2, for detecting the fluid pressure difference sensor 10 of liquid gas shift pressure measurement cylinder 8 compressed air and outside air pressure reduction; Be connected with fluid pressure difference sensor 10, the pressure reduction for being detected by fluid pressure difference sensor 10 changes into out the micro computer of head piece 8 flow.
The outer wall of liquid gas shift pressure measurement cylinder 2 is fixed with the semicircle insulation blocking straight tube 3 protecting freeing port 5 of giving vent to anger, the bottom of semicircle insulation blocking straight tube 3 is with bottom surface, and with Inlet and outlet water through hole 6 on this bottom surface, the top of semicircle insulation blocking straight tube 3 is empty.The top of semicircle insulation blocking straight tube 3 flushes with the end face of liquid gas shift pressure measurement cylinder 2.Semicircle insulation blocking straight tube 3 is arranged on the periphery of freeing port 5 of giving vent to anger and is fixed on the outer wall of liquid gas shift pressure measurement cylinder 2.Go out head piece 8 for aperture or ozzle.
The bottom of liquid gas shift pressure measurement cylinder 2 is provided with the connected entrance 1 communicated with the inner space of Experimental Water Tank 7, for being communicated with Experimental Water Tank 7.The bottom of liquid gas shift pressure measurement cylinder 2 and the bottom surface of Experimental Water Tank 7 are fixed.
The weir divider 15 be divided into by Experimental Water Tank 7 into water workspace and overflow area is provided with in Experimental Water Tank 7, weir divider 15 is arranged in Experimental Water Tank 7, be fixed on the bottom surface of Experimental Water Tank 7, Experimental Water Tank 7 inside is divided into two parts, a part is water inlet workspace, liquid gas shift pressure measurement cylinder 2 is arranged on in water workspace, and the head piece that goes out of Experimental Water Tank 7 is also arranged on in water workspace.
Intake in Experimental Water Tank 7 bottom of workspace is provided with water inlet 16, and in Experimental Water Tank 7, overflow area is provided with water delivering orifice 17.The water that water inlet workspace overflows is discharged by water delivering orifice 17.
Water delivering orifice 17 is arranged on the bottom of overflow area in Experimental Water Tank 7, facilitates draining.
Weir divider 15 is provided with spout hole, is plugged with stopper 18, stopper 19 in this spout hole.Different spout holes can be set on the differing heights of weir divider 15, thus better adjust flood level.When needs adjustment overflow position, by opening stopper 18, stopper 19 realizes.
In fluid pressure difference sensor 10 one is measured mouth and is led to air, and another measurement mouth in fluid pressure difference sensor 10 is tightly connected by conduit (hollow pressure conducting tube 12, flexible pipe 9 and snorkel 4) and liquid gas shift pressure measurement cylinder 2.Conduit inserts one end of liquid gas shift pressure measurement cylinder 2 between the upper edge of freeing port 5 of giving vent to anger and the end face of liquid gas shift pressure measurement cylinder 2, and higher than the upper edge of freeing port 5 of giving vent to anger.
The flow measurement device that water tank of the present invention goes out stream is specially the flow measurement device going out stream based on the aperture of acting head and ozzle class water tank, there is the Experimental Water Tank 7 that a fenestrated or vertical water outflowing jet treat measurement of discharge, this type of Experimental Water Tank large-scale application: usually have a pump intake 16, water tank internal insulation is become 2 parts by one piece of weir divider 15 lower than tank height, after water tank water intake, liquid level goes out higher than weir divider 15 i.e. overflow, discharges Experimental Water Tank 7 by water delivering orifice 17.In order to obtain multiple overflow constant water level, this kind of Experimental Water Tank can offer several overflow macropore at differing heights on weir divider 15, and clogs with stopper 18,19, pulls out the overflow constant water level of differing heights stopper with regard to adjustable differing heights as required.Surface level 21 is overflow constant water level when not pulling out stopper.
The liquid gas shift pressure measurement cylinder 2 (being also called for short pressure measurement cylinder 2) of a transparent organic glass material is provided with in Experimental Water Tank 7, pressure measurement cylinder 2 is diameter about a 5cm right cylinder, height goes out the aperture ozzle axis horizontal line 1cm of stream higher than Experimental Water Tank 7, there is sealer glass cover, without bottom surface, in the bottom surface leaving aperture ozzle more remote glue bonding and be fixed on Experimental Water Tank 7.Pressure measurement cylinder sidewall bottom has the little UNICOM mouth 1 (sidewall bottom can open several little UNICOMs mouth along bottom one circle more, plays and filters current stabilization water inlet effect, ensures the stable rising of fluid level in cylinder) of semicircle, can lead to Experimental Water Tank 7 aqueous phase.Pressure measurement cylinder 2 upper portion side wall has a freeing port 5 of giving vent to anger; freeing port of giving vent to anger 5 flushes with the aperture ozzle axis surface level 20 going out to flow along the horizontal plane; this give vent to anger freeing port 5 outer wall also vertical seal be bonded with the semicircle insulation blocking straight tube 3 that slices off half sidewall; sealing bottom surface is had bottom semicircle insulation blocking straight tube 3; bottom surface has an Inlet and outlet water aperture 6, end face is empty.
Pressure measurement cylinder 2 top seal is inserted with 1 thinner stainless steel hollow vent pipe 4, internal diameter is about 1.5mm, snorkel 4 outer wall is by 502 glue and pressure measurement cylinder 2 top perforate inwall hermetic seal adhesion, communicate with the 2 upper air posts sealed in pressure measurement cylinder, the outer valve of cylinder protrudes pressure measurement cylinder 2 about about 1cm, salable overcoat is applicable to the PVC transparent flexible pipe of internal diameter as ventilation pressure measurement connecting hose 9 (being also PVC hose 9), PVC hose 9 possesses good elasticity, can tightly outer be enclosed within outside stainless steel snorkel, in this experiment comparatively infrabar i.e. 1.1 times of atmospheric pressures, PVC hose 9 and stainless steel snorkel 4 can be accomplished well to be tightly connected.PVC hose 9 is about 80cm, drawing the outer other end of Experimental Water Tank 7 is tightly enclosed within an interface hollow pressure conducting tube 12 of fluid pressure difference sensor 10, fluid pressure difference sensor 10 is relative pressure sensor, have 2 hollow pressure conducting tubes 11 and 12, hollow pressure conducting tube 11 communicates with air.
During experiment, mix up desktop level, put Experimental Water Tank 7 on the table by water pump water-filling, liquid level can swing with undaform and rise, now pressure measurement cylinder 2 is by the synchronous current stabilization filtered water inlet of bottom water inlet 1, and make pressure measurement cylinder water level inside basic synchronization steadily increase, pressure measurement cylinder 2 inner air can upwards be discharged by freeing port 5 of giving vent to anger, upwards drain through insulation blocking straight tube 3 again, along with outside Experimental Water Tank 7 middle water level to increase to in freeing port 5 of giving vent to anger along the horizontal plane, insulation blocking straight tube 3 due to inlet opening, bottom 6 smaller, in pipe, water level rises slowly, an isolation airway can be formed, freeing port 5 water level in pressure measurement cylinder that can make to give vent to anger to be elevated on aperture 5 before edge, firmly can not to be given vent to anger freeing port 5 by water seal in extraneous Experimental Water Tank, 2 air in pressure measurement cylinder are avoided not to be discharged to the systematic error of bit strip.When in pressure measurement cylinder 2, water level steadily to rise in freeing port 5 of giving vent to anger along the horizontal plane, when namely going out the aperture ozzle axis surface level 20 of stream, pressure measurement cylinder 2 top can be closed one section of air column and cannot discharge, now pressure measurement cylinder 2 water level inside no longer raises, in pressure measurement cylinder 2, water can flow out from the freeing port 5 of giving vent to anger of sidewall, with Experimental Water Tank 7 water body UNICOM.Therefore fluid pressure difference sensor 10 is by the hollow tubular 4 of gas circuit UNICOM, survey be exactly the pressure of seal compression air column relative atmospheric pressure in pressure measurement cylinder 2.The pressure signal that fluid pressure difference sensor 10 records is sent in micro computer, after converting by calibration formula in micro computer inside, the LED screen of microcomputer-recognized intelligent gauge outfit 13 shows aperture ozzle flow number.
Place near experiment instrument limit, the convenient electric pilot 14 being connected PVC hose 9 with pressure measurement and being connected, electric pilot 14 includes the micro computer digital display meter head 13 of fluid pressure difference sensor 10 and storage able to programme, the pressure signal that fluid pressure difference sensor 10 records can be input in micro computer, change through inner A/D, and directly demonstrate data on flows by the Program transformation going out to flow flow formula of micro computer inner orifice or ozzle in gauge outfit.
During concrete enforcement, often overlap and go out the flow measurement device of stream under certain stable head of Experimental Water Tank based on the aperture of acting head and ozzle class water tank, one group of Q is done to flow detector
v-H
0nominal data, goes out to flow flow formula namely according to aperture and ozzle
the μ value of every platform is calculated demarcation out, stored in the programming parameter of micro computer gauge outfit.Demarcate a μ value fixed constant, can according to real-time acting head H
0, the aperture in real-time experiments of measuring instrument each stage or vertical water outflowing jet flow.
Last it is noted that obviously, above-described embodiment is only for example of the present invention is clearly described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (10)
1. water tank goes out a flow measurement device for stream, it is characterized in that, comprising:
Sidewall takes the Experimental Water Tank of head piece out of;
Be arranged on the liquid gas shift pressure measurement cylinder in described Experimental Water Tank, the bottom of described liquid gas shift pressure measurement cylinder is communicated with the inner space of described Experimental Water Tank, the sidewall of described liquid gas shift pressure measurement cylinder is provided with freeing port of giving vent to anger, the upper edge of this freeing port of giving vent to anger with described go out the axis surface level of head piece flush;
Be connected with described liquid gas shift pressure measurement cylinder, for detecting the fluid pressure difference sensor of described liquid gas shift pressure measurement cylinder compressed air and outside air pressure reduction;
Be connected with described fluid pressure difference sensor, the pressure reduction for being detected by fluid pressure difference sensor changes into out the micro computer of head piece flow.
2. water tank according to claim 1 goes out the flow measurement device of stream; it is characterized in that; the outer wall of described liquid gas shift pressure measurement cylinder is fixed with the insulation blocking straight tube of freeing port of giving vent to anger described in protection; the bottom of described insulation blocking straight tube is with bottom surface; with Inlet and outlet water through hole on this bottom surface, the top of described insulation blocking straight tube is empty.
3. water tank according to claim 2 goes out the flow measurement device of stream, it is characterized in that, the top of described insulation blocking straight tube between the upper edge and the end face of described Experimental Water Tank of described freeing port of giving vent to anger, and higher than the upper edge of described freeing port of giving vent to anger.
4. water tank according to claim 1 goes out the flow measurement device of stream, and it is characterized in that, the described head piece that goes out is aperture or ozzle.
5. water tank according to claim 1 goes out the flow measurement device of stream, and it is characterized in that, the bottom of described liquid gas shift pressure measurement cylinder is provided with the connected entrance communicated with the inner space of described Experimental Water Tank.
6. water tank according to claim 1 goes out the flow measurement device of stream, it is characterized in that, is provided with the weir divider be divided into by Experimental Water Tank into water workspace and overflow area in described Experimental Water Tank.
7. water tank according to claim 6 goes out the flow measurement device of stream, and it is characterized in that, the bottom of the workspace that intakes in described Experimental Water Tank is provided with water inlet, and in described Experimental Water Tank, overflow area is provided with water delivering orifice.
8. water tank according to claim 6 goes out the flow measurement device of stream, and it is characterized in that, described weir divider is provided with spout hole, is plugged with stopper in this spout hole.
9. water tank according to claim 1 goes out the flow measurement device of stream, it is characterized in that, in described fluid pressure difference sensor one is measured mouth and is led to air, and another measurement mouth in described fluid pressure difference sensor is tightly connected by conduit and described liquid gas shift pressure measurement cylinder.
10. water tank according to claim 9 goes out the flow measurement device of stream, it is characterized in that, described conduit inserts one end of described liquid gas shift pressure measurement cylinder between the upper edge of described freeing port of giving vent to anger and the end face of described liquid gas shift pressure measurement cylinder, and higher than the upper edge of described freeing port of giving vent to anger.
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| CN109506734A (en) * | 2017-09-15 | 2019-03-22 | 玛珂系统分析和开发有限公司 | Method for measuring fill level |
| CN109443454A (en) * | 2018-11-12 | 2019-03-08 | 北京市水科学技术研究院 | A kind of flow monitoring device and method suitable for the confined space |
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