CN105606177A - Flow velocity and flow rate measuring device with intelligent digital display instrument and flow velocity and flow rate measuring method using device - Google Patents

Abstract

The invention discloses a flow velocity and flow rate measuring device with an intelligent digital display instrument and a flow velocity and flow rate measuring method using the device. The flow velocity and flow rate measuring device comprises a measuring hole, a connecting tube, an air exhausting device, a pressure stabilizing barrel, a liquid level detection rod, a pressure sensor, a pressure signal analyzer, a water storage tank and a tube nozzle, wherein the liquid level detection rod is hollow; the measuring hole is formed in one end of the liquid level detection rod; the other end of the liquid level detection rod is in sealing connection with the connecting tube; the connecting tube is connected with the pressure sensor and the pressure signal analyzer in sequence; the measuring hole is covered by the pressure stabilizing barrel; a plurality of exhaust holes are formed in the top of the pressure stabilizing barrel; a plurality of liquid inlets are formed in the lower part of the pressure stabilizing barrel; the air exhausting device is connected with the connecting tube and used for discharging liquid inside the connecting tube; the measuring hole is arranged in the water storage tank; the tube nozzle is arranged on the water storage tank. Through digital display of the pressure sensor and the digital display instrument, the flow velocity and flow rate measuring device is simple in structure, applicable to measurement and conversion of pressure of all liquids, good in universal applicability and simple and convenient to operate, and can realize liquid level measurement.

Description

A kind of flow velocity and flow rate-measuring device and method thereof with intelligent digital displaying

Technical field

The present invention relates to engineering survey and laboratory apparatus, relate in particular to a kind of flow velocity and flow with intelligent digital displayingDeterminator and method thereof.

Background technology

The measurement of liquid level, in engineering field and laboratory apparatus field, is the key element extensively existing, the metering of liquid levelBe one of part of measuring science technology, it and national economy, national defense construction, scientific research have closeRelation. The convenience of level gauging and accuracy, to ensureing product quality, improve engineering productivity ratio, advancing scienceThe development of technology all has important effect.

Traditional mechanical liquid level is measured, and in the majority is directly to survey and read, to the convenience deficiency in space. Also have logicalCross communicating pipe transfer and read with surveying, in communicating pipe, have carbonated drink combination, liquid-level pressure fluctuation but may existThe problems such as shakiness, if there is its air water combination, the data of the distortion that can lead to errors, pressure instability mayCause reading difficulty and the larger consequence of error. In addition, the accurate induction unit of the more employing of current checkout gearPart or probe, in liquid, must cause its sensitivity to reduce gradually this kind equipment Long term immersion, finally losesEffect. Thereby cause component wear, seriously may cause whole equipment need overhaul or directly scrap.

Summary of the invention

The object of the invention is to solve problems of the prior art, and provide a kind of with intelligent digital displayingFlow velocity and flow rate-measuring device. Concrete technical scheme is as follows:

Flow velocity with intelligent digital displaying and a flow rate-measuring device, it comprises measures mouth, tube connector, exhaust dressPut, voltage stabilizing bucket, level detection bar, pressure sensor and pressure signal analyzer; Level detection bar hollow, surveysAmount mouthful is opened in level detection bar one end, and the level detection bar other end is connected with tube connector is airtight, and tube connector successivelyBe connected with pressure signal analyzer with pressure sensor; Voltage stabilizing bucket covers in to be measured outside mouth, and top offers someIndividual steam vent, several inlet openings are offered in bottom; Exhaust apparatus is connected with tube connector, for discharging in tube connectorLiquid. Measure and mouthful be arranged in storage tank, and on storage tank with ozzle.

As preferably, described exhaust apparatus is air pump, and air pump communicates by pipeline with tube connector, and this section pipeRoad is provided with valve, and exhaust outlet is arranged on the pipeline between valve and air pump, and exhaust outlet arranges standard and is: work as surveyWhen amount mouthful is placed in testing liquid and utilizes air pump to carry out discharge opeing, the input tolerance of air pump is greater than from exhaust outlet dischargesTolerance.

As further preferably, be provided with air pressure tank between between described valve and air pump, described exhaust outlet is openedBe located on air pressure tank.

Another object of the present invention is to provide a kind of flow velocity and flow determining method that uses described device, stepAs follows: first by valve open, and by measuring mouthful a certain depth of testing liquid of putting into storage tank, will to connectGas in adapter is discharged from exhaust outlet, after level stability, pressure signal analyzer is carried out to school zero; School zero is completeCheng Hou, opens air pump tube connector is carried out to air-blowing, will connect liquid in pipe and discharge, and treats that pressure signal analyzer is aobviousWhen the reading showing tends towards stability, valve-off, the pressure value P that pressure signal analyzer is shown is carried out reading alsoThis force value is converted into and measures a mouthful liquid height H for top, and reduction formula is as follows:

$H=\frac{P}{\mathrm{\ρ}g}$

Wherein: ρ is testing liquid density, g is acceleration of gravity;

Measure again mouthful and the difference in height Δ H of ozzle, and flow according to the outlet that following formula is converted into ozzleSpeed v and flow Q:

$v={\mathrm{\μ}}_v\sqrt{2g(H+\mathrm{\Δ}H)}$

$Q={\mathrm{\μ}}_{Q}A\sqrt{2g(H+\mathrm{\Δ}H)}$

Wherein: μ_vAnd μ_QBe respectively aperture flow velocity and discharge coefficient, A is ozzle area.

Compared with prior art, tool has the following advantages in the present invention:

1) simple in structure, easy to operate, can will install the level gauging work that be applied to easily various liquidAuthor's flood, applied widely.

2) intuitive measurement results is reliable, in digitized mode, measurement result is shown.

3) device does not need precision instrument, and main equipment is positioned at outside testing liquid, and immerses liquid part knotStructure is very simple, does not have easily aging or induction spy of various parts in existing flow velocity and flow rate-measuring deviceThe problem that sensitivity declines.

Brief description of the drawings

Fig. 1 is a kind of flow velocity and flow rate-measuring device structural representation with intelligent digital displaying;

Fig. 2 is a kind of preferred form of exhaust apparatus of the present invention;

In figure: measure mouth 1, tube connector 2, exhaust apparatus 3, voltage stabilizing bucket 4, level detection bar 5, pressure biographySensor 6, pressure signal analyzer 7, air pump 301, valve 302 and air pressure tank 303.

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is further elaborated and is illustrated. Each enforcement side in the present inventionThe technical characterictic of formula is not having under conflicting prerequisite, all can carry out respective combination.

As shown in Figure 1, a kind of flow velocity and flow rate-measuring device with intelligent digital displaying, it comprise measure mouthful 1,Tube connector 2, exhaust apparatus 3, voltage stabilizing bucket 4, level detection bar 5, pressure sensor 6 and pressure signal analysisInstrument 7; Level detection bar 5 hollows, measure mouth 1 and are opened in level detection bar 5 one end, and level detection bar 5 is anotherOne end is connected with tube connector 2 is airtight, tube connector 2 successively with pressure sensor 6 and pressure signal analyzer 7Be connected; Voltage stabilizing bucket 4 covers in to be measured outside mouthful 1, and top offers several steam vents, and several are offered in bottomInlet opening; Exhaust apparatus 3 is connected with tube connector 2, for discharging the liquid in tube connector 2. Storage tank 8In-built have a testing liquid, measure mouthful 1 and be arranged in storage tank 8, and on storage tank 8 with ozzle 9.

The operation principle of this device is as follows: first the pressure sensor 6 induction pressure values of not placing feed liquor body are pressedPower is carried out record, then measurement mouth 1 is goed deep into certain height of testing liquid, in this stage, and gas in tube connector 2Constantly compressed, pressure sensor 6 induction pressure values, and signal is transferred to pressure signal analyzer 7, fromAnd measure air pressure. In the time of pressure level-off, by reading the relevant pressure under this state, and deduct previousReading, thus pressure differential obtained, and be scaled liquid level.

Measuring mouth 1 can directly be connected with tube connector 2, but for the ease of operation, adopts the rigidity liquid level of hollow to visitMeasuring staff 5, is convenient to stretch in testing liquid, is also conducive to the stable of measuring process, can be with the ripple of testing liquidMove and change.

Exhaust apparatus 3 can adopt various gas generating units, as inflator, air pump etc. In present embodiment, rowDevice of air 3 is air pump 301, and air pump 301 communicates by pipeline with tube connector 2, and this section of pipeline is provided with valveDoor 302, exhaust outlet is arranged on the pipeline between valve and air pump 301, and exhaust outlet arranges standard and is: work as measurementWhen mouth 1 is placed in testing liquid and utilizes air pump 301 to carry out discharge opeing, the input tolerance of air pump 301 is greater than from rowThe tolerance that gas port is discharged.

Above-mentioned exhaust outlet is preferably opened on the cavity of rigidity, therefore can be between between valve 302 and air pump 301Be provided with air pressure tank 303, described exhaust outlet is opened on air pressure tank 303. Air pressure tank 303 row of playing simultaneouslyThe effect of gas and voltage stabilizing.

The flow velocity and the flow determining method that use described device, step is as follows: first valve 302 opened,And will measure mouthful 1 a certain depth of testing liquid of putting into storage tank 8, by the gas in tube connector 2 from rowGas port is discharged, and after level stability, pressure signal analyzer 7 is carried out to school zero; After school zero completes, open air pump301 pairs of tube connectors 2 carry out air-blowing, and interior tube connector 2 liquid is discharged, and treat what pressure signal analyzer 7 showedWhen reading tends towards stability, valve-off 302, the pressure value P that pressure signal analyzer 7 is shown is carried out readingAnd this force value is converted into the liquid height H that measures mouthful 1 top, reduction formula is as follows:

$H=\frac{P}{\mathrm{\ρ}g}$

Wherein: ρ is testing liquid density, g is acceleration of gravity;

Measure again mouthful 1 with the difference in height Δ H of ozzle 9, and be converted into ozzle 9 according to following formulaExit velocity v and flow Q:

$v={\mathrm{\μ}}_v\sqrt{2g(H+\mathrm{\Δ}H)}$

$Q={\mathrm{\μ}}_{Q}A\sqrt{2g(H+\mathrm{\Δ}H)}$

Wherein: μ_vAnd μ_QBe respectively aperture flow velocity and discharge coefficient, A is ozzle area.

As can be seen here, flow velocity and the flow rate-measuring device with intelligent digital displaying disclosed by the invention, simple in structure,The scope of application can relate to all liq and press force measurement and conversion, has general applicability; And easy and simple to handle, useConvenient, can realize the digitlization of measuring liquid level.

Claims (4)

1. the flow velocity with intelligent digital displaying and a flow rate-measuring device, is characterized in that, it comprises measures mouth(1), tube connector (2), exhaust apparatus (3), voltage stabilizing bucket (4), level detection bar (5), pressure sensor(6), pressure signal analyzer (7), storage tank (8) and ozzle (9); Level detection bar (5) hollow,Measure mouthful (1) and be opened in level detection bar (5) one end, level detection bar (5) other end and tube connector (2)Airtight connection, tube connector (2) is connected with pressure signal analyzer (7) with pressure sensor (6) successively;Voltage stabilizing bucket (4) covers in to be measured outside mouthful (1), and top offers several steam vents, and several are offered in bottomInlet opening; Exhaust apparatus (3) is connected with tube connector (2), for discharging the liquid in tube connector (2);Measure mouthful (1) and be arranged in storage tank (8), and storage tank (8) is upper with ozzle (9).

2. flow velocity and the flow rate-measuring device with intelligent digital displaying as claimed in claim 1, is characterized in that,Described exhaust apparatus (3) is air pump (301), and air pump (301) communicates by pipeline with tube connector (2),And this section of pipeline is provided with valve (302), exhaust outlet is arranged at the pipe between valve (302) and air pump (301)Lu Shang, exhaust outlet arranges standard and is: be placed in testing liquid and utilize air pump (301) to enter when measuring mouthful (1)When row discharge opeing, the input tolerance of air pump (301) is greater than the tolerance of discharging from exhaust outlet.

3. flow velocity and the flow rate-measuring device with intelligent digital displaying as claimed in claim 2, is characterized in that,Between between described valve (302) and air pump (301), be provided with air pressure tank (303), described exhaust outlet is offeredOn air pressure tank (303).

4. use is installed as claimed in claim 3 flow velocity and a flow determining method, is characterized in that, stepRapid as follows: first valve (302) to be opened, and will be measured mouthful (1) and put into the to be measured of storage tank (8)The a certain depth of liquid, discharges the gas in tube connector (2) from exhaust outlet, after level stability to pressureSignal analyzer (7) carries out school zero; After school zero completes, open air pump (301) tube connector (2) is carried outAir-blowing, discharges interior tube connector (2) liquid, treats that the reading that pressure signal analyzer (7) shows tends towards stabilityTime, valve-off (302), the pressure value P that pressure signal analyzer (7) is shown is carried out reading also shouldForce value is converted into measures mouthful liquid height H of (1) top, and reduction formula is as follows:

$H=\frac{P}{\mathrm{\ρ}g}$

Wherein: ρ is testing liquid density, g is acceleration of gravity;

Measure again the difference in height Δ H that measures mouthful (1) and ozzle (9), and be converted into according to following formulaThe exit velocity v of ozzle (9) and flow Q:

$v={\mathrm{\μ}}_v\sqrt{2g(H+\mathrm{\Δ}H)}$

$Q={\mathrm{\μ}}_{Q}A\sqrt{2g(H+\mathrm{\Δ}H)}$

Wherein: μ_vAnd μ_QBe respectively aperture flow velocity and discharge coefficient, A is ozzle area.