CN105067058A - Non-contact measuring system and method for drainage pipeline fluid flow - Google Patents

Non-contact measuring system and method for drainage pipeline fluid flow Download PDF

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Publication number
CN105067058A
CN105067058A CN201510512537.0A CN201510512537A CN105067058A CN 105067058 A CN105067058 A CN 105067058A CN 201510512537 A CN201510512537 A CN 201510512537A CN 105067058 A CN105067058 A CN 105067058A
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fluid
drainage pipeline
liquid level
ultrasonic
measuring system
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陈德莉
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Upper Hainan Airlines Are Levied Tt&c System Co Ltd
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Upper Hainan Airlines Are Levied Tt&c System Co Ltd
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Abstract

The invention provides a non-contact measuring system and method for drainage pipeline fluid flow. The measuring method comprises the steps that the surface flow rate of fluid is calculated according to the frequency of a transmitting wave and the frequency of radar echo with the combination of the angle of the jet liquid surface of the fluid; the liquid level of the fluid is calculated according to the sending and receiving time interval of ultrasonic pulses; the average flow rate of fluid inside the drainage pipeline is calculated according to the surface flow rate and the liquid level; the flow passage area of the fluid is calculated according to the liquid level and the radius of the pipeline; the instantaneous flow rate of the fluid is calculated according to the average flow rate and the flow passage area. Compared with the prior art, by the adoption of the non-contact measuring method, the surface flow rate and liquid level of the fluid inside the pipeline are measured, and then the instantaneous flow of the fluid is worked out. Due to the non-contact measurement, the problem of sludge sedimentation is avoided, and no periodic cleaning is needed. In addition, the measuring device is small in occupied space, low in total power consumption and convenient to install.

Description

A kind of measuring system of contactless drainage pipeline fluid flow and method
Technical field
The present invention relates to the liquid surface fluid-velocity survey fields such as a kind of water, mud, particularly relate to a kind of measuring system and method for contactless drainage pipeline fluid flow.
Background technology
The detection of current China unwatering system is in the starting stage.Drainage pipeline networks comprises rainwater-collecting pipe network and sewage network, for a long time, the existing scheme overwhelming majority does not have the quantification monitoring carrying out fluid in pipeline, flow measurement in current only several places pipeline also all adopts the measuring method of contact, that is, survey sensor is put in the middle of liquid to obtain speed and the liquid level of fluid.This contact method is provided with very high requirement to equipment, and installation must be deep into duct bottom, and the professional of corresponding qualification must be had to operate, and the installation operation in drainage pipeline has certain danger.In addition, if measuring object is the fluid flow in sewage network, survey sensor after a period of operation, its surface is often covered by mud, make measuring accuracy reduce or even lost efficacy, operating personnel have to by equipment take out clean up reinstall to again duct bottom can continue measure.
In view of this, how designing a kind of solution measuring the fluid flow of drainage pipeline, effectively to improve or to eliminate above-mentioned defect, is a current problem urgently to be resolved hurrily.
Summary of the invention
The above-mentioned defect existing for fluid flow of drainage pipeline is measured, the measuring system of that the invention provides a kind of novelty, contactless drainage pipeline fluid flow and method for the survey sensor based on contact of the prior art.
According to one aspect of the present invention, provide a kind of measuring method of contactless drainage pipeline fluid flow, comprise the following steps:
According to the frequency of radar emission wave frequency and radar return, in conjunction with the angle of the incident fluid level of described radar transmitting wave, calculate the surface velocity of described fluid;
According to the delivery time of ultrasonic pulse and the time interval between the time of reception, calculate the liquid level of described fluid;
According to surface velocity and the liquid level of described fluid, calculate the mean flow rate of the fluid in described drainage pipeline;
According to the liquid level of described fluid and the pipe radius of described drainage pipeline, calculate the flow area of described fluid; And
According to described mean flow rate and described flow area, calculate the instantaneous delivery of described fluid.
An embodiment wherein, the surface velocity v of described fluid meets following relational expression:
v = c × f d 2 f × c o s θ
Wherein, c is the aerial velocity of propagation of radar wave, f dfor the Doppler frequency difference between radar transmitting wave f and radar return f ', wherein f d=| f-f ' |, θ is the angle of the incident fluid level of radar transmitting wave f.
An embodiment wherein, the liquid level of described fluid meets following relational expression: L=CT/2, wherein L represents the liquid level of fluid and the distance value of ultrasonic level gage, C is hyperacoustic speed, and T is for ultrasonic level gage is from launching ultrasonic pulse to the time interval received needed for ultrasonic pulse.
An embodiment wherein, described ultrasonic level gage is installed on the top of described drainage pipeline, and the liquid level h of described fluid equals the setting height(from bottom) D of described ultrasonic level gage and the difference of described distance value L.
An embodiment wherein, the flow area of described fluid meets following relational expression:
S = ( π 2 + a r c s i n h - R R ) R 2 + ( h - R ) R 2 - ( h - R ) 2
Wherein, h is the liquid level of described fluid, and R is the pipe radius of described drainage pipeline, and S is the flow area of described fluid.
According to another aspect of the present invention, provide a kind of measuring system of contactless drainage pipeline fluid flow, comprising:
One ultrasonic level gage, is installed on the top of described drainage pipeline, and it comprises a probe, also receives for launching ultrasonic pulse the ultrasonic echo reflected by described flow surface, exports the voltage signal of the liquid level of the described drainage pipeline of reflection; And
One electric flow meter, comprises antenna plate and signal-processing board, and described antenna plate receiving antenna signal also exports a difference frequency signal after amplification, mixing and filtering; Described signal-processing board is connected with described antenna plate, for sampling to the difference frequency signal received, in conjunction with the tilt angles of antenna plate, determine surface velocity and the flow direction of described fluid, and according to from described ultrasonic level gage, reflect that the voltage signal of the liquid level of described drainage pipeline calculates the instantaneous delivery information of described fluid.
An embodiment wherein, described electric flow meter and described ultrasonic level gage are fixedly mounted on same corrosion resistant plate by screw, and the frequency of operation of described electric flow meter is 24GHz, and the ultrasonic pulse frequency of described ultrasonic level gage is 40kHz.
An embodiment wherein, described measuring system also comprises a remote-terminal unit (RemoteTerminalUnit, and a high power lithium battery RTU), described remote-terminal unit is connected with described electric flow meter, described high power lithium battery and an omnidirectional antenna, for the data that receive from described omnidirectional antenna and the data sent from described electric flow meter.
An embodiment wherein, remote-terminal unit is the SIM card of mobile communication terminal.
An embodiment wherein, described electric flow meter also comprises a mechanical interface and an electric connector, and described mechanical interface is used for mounting and fixing bracket, and described electric connector is for connecting described remote-terminal unit.
Adopt measuring system and the method for contactless drainage pipeline fluid flow of the present invention, first according to radar emission wave frequency, the angle calculation of the frequency of radar return and the incident fluid level of radar transmitting wave obtains surface velocity, then the liquid level of fluid is calculated according to the transmission of ultrasonic pulse and the time interval of reception, then the mean flow rate of fluid is calculated according to the surface velocity of fluid and liquid level, the flow area of fluid is calculated again according to the liquid level of fluid and the pipe radius of drainage pipeline, finally according to the instantaneous delivery of mean flow rate and flow area Fluid Computation.Compared to prior art, the present invention adopts contactless measuring method, measures the surface velocity of fluids within pipes and liquid level, and then calculate the instantaneous delivery of fluid, owing to being non-contact measurement mode, thus the problems such as mud alluvial can not be brought, without the need to periodic cleaning.Measurement mechanism mainly comprises electric flow meter and ultrasonic level gage, and its general assembly (TW) is less than 1kg, lightweight and portable in volume.In addition, the overall power consumption of measurement mechanism is low, and the total power consumption of electric flow meter and ultrasonic level gage is less than 1W.Moreover the installation of measurement mechanism only needs at manhole constructing, reduces the difficulty of construction of operating personnel, eliminate the danger of the inner long-time underground construction of drainage pipeline.
Accompanying drawing explanation
Reader, after having read the specific embodiment of the present invention with reference to accompanying drawing, will become apparent various aspects of the present invention.Wherein,
Fig. 1 illustrates the application scenarios schematic diagram of the measuring system of contactless drainage pipeline fluid flow of the present invention;
Fig. 2 illustrates the electric flow meter of the measuring system of Fig. 1 and the structural representation of ultrasonic level gage;
Fig. 3 illustrates the structure composition schematic diagram of the electric flow meter of Fig. 2;
Fig. 4 illustrates the mutual schematic diagram of data message in the measuring system of Fig. 1;
Fig. 5 illustrates the schematic diagram of the liquid level of the fluid of the measuring system of Fig. 1; And
Fig. 6 illustrates according to one embodiment of the present invention, the FB(flow block) of the measuring method of contactless drainage pipeline fluid flow.
Embodiment
The technology contents disclosed to make the application is more detailed and complete, and can refer to accompanying drawing and following various specific embodiment of the present invention, mark identical in accompanying drawing represents same or analogous assembly.But those of ordinary skill in the art should be appreciated that hereinafter provided embodiment is not used for limiting the scope that contains of the present invention.In addition, accompanying drawing, only for being schematically illustrated, is not drawn according to its life size.
With reference to the accompanying drawings, the embodiment of various aspects of the present invention is described in further detail.
Fig. 1 illustrates the application scenarios schematic diagram of the measuring system of contactless drainage pipeline fluid flow of the present invention.Fig. 2 illustrates the electric flow meter of the measuring system of Fig. 1 and the structural representation of ultrasonic level gage.Fig. 3 illustrates the structure composition schematic diagram of the electric flow meter of Fig. 2.Fig. 4 illustrates the mutual schematic diagram of data message in the measuring system of Fig. 1.Fig. 5 illustrates the schematic diagram of the liquid level of the fluid of the measuring system of Fig. 1.
Composition graphs 1 to Fig. 5, in an illustrative examples, measuring system of the present invention mainly comprises ultrasonic level gage and electric flow meter.Wherein, ultrasonic level gage is installed on the top of drainage pipeline, and it comprises a probe, and this probe also receives for launching ultrasonic pulse the ultrasonic echo reflected by flow surface, exports the voltage signal of the liquid level of reflection drainage pipeline.Electric flow meter comprises antenna plate and signal-processing board, and antenna plate receiving antenna signal also exports a difference frequency signal after amplification, mixing and filtering.Signal-processing board is connected with antenna plate, for sampling to the difference frequency signal received, and in conjunction with the tilt angles of antenna plate, determine surface velocity and the flow direction of fluid, and according to from ultrasonic level gage, the voltage signal of liquid level of reflection drainage pipeline calculates the instantaneous delivery information of fluid.
As shown in Figure 2, electric flow meter and ultrasonic level gage are fixedly mounted on same corrosion resistant plate by screw, and respectively there are 4 Ф 6 through holes the front and back of corrosion resistant plate, adopt screw that electric flow meter and ultrasonic level gage are fixed to steel plate.The afterbody of electric flow meter leaves the mechanical interface of mounting and fixing bracket tubing, has different specifications according to the different-diameter of tubing.The frequency of operation of electric flow meter is 24GHz, and the ultrasonic pulse frequency of ultrasonic level gage is 40kHz, and the ultrasonic pulse that the radar wave of thus electric flow meter transmitting and ultrasonic level gage are launched can't form interference each other.
At a specific embodiment, this measuring system also comprises remote-terminal unit (RemoteTerminalUnit, RTU) and a high power lithium battery.Remote-terminal unit is connected with electric flow meter, high power lithium battery and omnidirectional antenna, for the data that receive from omnidirectional antenna and the data sent from electric flow meter, as shown in Figure 4.Such as, remote-terminal unit is the SIM card of mobile communication terminal.Mobile phone signal is sent to drainage pipeline Survey control platform by omnidirectional antenna by remote-terminal unit, then carrys out loopback instruction to remote-terminal unit by Survey control platform, is controlled by remote-terminal unit according to loopback instruction to whole measuring system.In addition, the supplying cell in system should take into full account security performance, and such as acid-proof is anticorrosion, waterproof, blast protection, generally selects high power lithium battery to power here.In FIG, as previously mentioned, electric flow meter and ultrasonic level gage are arranged on the mounting bracket of corrosion resistant plate material, and its axis direction and water (flow) direction should be consistent in orientation.In inspection shaft, fix two square plates with expansion bolt in the position being positioned at import, one for hanging mounting bracket, another is for laying remote-terminal unit, and battery is suspended on the iron ladder of the borehole wall, and the omnidirectional antenna of communication is arranged near inspection well cover.
With reference to Fig. 3, electric flow meter comprises antenna plate and signal-processing board.Antenna plate comprises power amplifier, dielectric oscillator, frequency mixer and intermediate frequency amplifier.Transmitting and receiving antenna is planar microstrip array antenna, is all the array of 4 × 16, and the back side of antenna plate is transmitter and receiver.After receiving antenna receives aerial signal, after linear amplifier LNA amplification, frequency mixer mixing, intermediate frequency amplifier filtering, difference frequency signal is delivered to signal-processing board.Signal-processing board is sampled to the difference frequency signal received by A/D sampling unit, carries out signal transacting after sampling by signal processing chip (such as ARM chip), in conjunction with the tilt angles that inclinometer provides, determines flow velocity and the flow direction of fluid.
From the above, the present invention adopts contactless metering system to measure the surface velocity of fluids within pipes and liquid level, and then calculates the instantaneous delivery of fluid, owing to being non-contact measurement, can not bring the problems such as mud alluvial, without the need to periodic cleaning.
Fig. 6 illustrates according to one embodiment of the present invention, the FB(flow block) of the measuring method of contactless drainage pipeline fluid flow.
With reference to Fig. 6, in this embodiment, first fluid measurement method performs step S101, according to the frequency of radar emission wave frequency and radar return, in conjunction with the angle of the incident fluid level of radar transmitting wave, and the surface velocity of Fluid Computation.Specifically,
The surface velocity v of fluid meets following relational expression:
v = c × f d 2 f × c o s θ
Wherein, c is the aerial velocity of propagation of radar wave, f dfor the Doppler frequency difference between radar transmitting wave f and radar return f ', wherein f d=| f-f ' |, θ is the angle of the incident fluid level of radar transmitting wave f.
Then step S103 is performed, according to the delivery time of ultrasonic pulse and the time interval between the time of reception, the liquid level of Fluid Computation.In one embodiment, the liquid level of fluid meets following relational expression: L=CT/2.Wherein, L represents the liquid level of fluid and the distance value of ultrasonic level gage, and C is hyperacoustic speed, and T is for ultrasonic level gage is from launching ultrasonic pulse to the time interval received needed for ultrasonic pulse.When ultrasonic level gage is installed on the top of drainage pipeline, the liquid level h of fluid equals the setting height(from bottom) D of ultrasonic level gage and the difference of above-mentioned distance value L, as shown in Figure 5.
Then perform step S105, according to surface velocity and the liquid level of fluid, calculate the mean flow rate of the fluid in drainage pipeline.Following execution step S107, according to the liquid level of fluid and the pipe radius of drainage pipeline, the flow area of Fluid Computation.Particularly, the flow area of fluid meets following relational expression:
S = ( π 2 + a r c s i n h - R R ) R 2 + ( h - R ) R 2 - ( h - R ) 2
Wherein, h is the liquid level of fluid, and R is the pipe radius of drainage pipeline, and S is the flow area of fluid.The technology of this area is to be understood that, drainage pipeline corresponding to above-mentioned fluid flow area corresponds to circle, after amendment mathematical model, the drainage pipeline of other cross sectional shapes can calculate the flow area of its fluid equally based on the pipeline relative dimensions of the liquid level of fluid and drainage pipeline.
Last according to step S109, utilize mean flow rate and flow area, the instantaneous delivery of Fluid Computation.Such as, the result after the mean flow rate that the instantaneous delivery Q of fluid equals fluid is multiplied with flow area.
Adopt measuring system and the method for contactless drainage pipeline fluid flow of the present invention, first according to radar emission wave frequency, the angle calculation of the frequency of radar return and the incident fluid level of radar transmitting wave obtains surface velocity, then the liquid level of fluid is calculated according to the transmission of ultrasonic pulse and the time interval of reception, then the mean flow rate of fluid is calculated according to the surface velocity of fluid and liquid level, the flow area of fluid is calculated again according to the liquid level of fluid and the pipe radius of drainage pipeline, finally according to the instantaneous delivery of mean flow rate and flow area Fluid Computation.Compared to prior art, the present invention adopts contactless measuring method, measures the surface velocity of fluids within pipes and liquid level, and then calculate the instantaneous delivery of fluid, owing to being non-contact measurement mode, thus the problems such as mud alluvial can not be brought, without the need to periodic cleaning.Measurement mechanism mainly comprises electric flow meter and ultrasonic level gage, and its general assembly (TW) is less than 1kg, lightweight and portable in volume.In addition, the overall power consumption of measurement mechanism is low, and the total power consumption of electric flow meter and ultrasonic level gage is less than 1W.Moreover the installation of measurement mechanism only needs at manhole constructing, reduces the difficulty of construction of operating personnel, eliminate the danger of the inner long-time underground construction of drainage pipeline.
Above, the specific embodiment of the present invention is described with reference to the accompanying drawings.But those skilled in the art can understand, when without departing from the spirit and scope of the present invention, various change and replacement can also be done to the specific embodiment of the present invention.These change and replace and all drop in claims of the present invention limited range.

Claims (10)

1. a measuring method for contactless drainage pipeline fluid flow, is characterized in that, this measuring method comprises the following steps:
According to the frequency of radar emission wave frequency and radar return, in conjunction with the angle of the incident fluid level of described radar transmitting wave, calculate the surface velocity of described fluid;
According to the delivery time of ultrasonic pulse and the time interval between the time of reception, calculate the liquid level of described fluid;
According to surface velocity and the liquid level of described fluid, calculate the mean flow rate of the fluid in described drainage pipeline;
According to the liquid level of described fluid and the pipe radius of described drainage pipeline, calculate the flow area of described fluid; And
According to described mean flow rate and described flow area, calculate the instantaneous delivery of described fluid.
2. measuring method according to claim 1, is characterized in that, the surface velocity v of described fluid meets following relational expression:
v = c × f d 2 f × cos θ
Wherein, c is the aerial velocity of propagation of radar wave, f dfor the Doppler frequency difference between radar transmitting wave f and radar return f ', wherein f d=| f-f ' |, θ is the angle of the incident fluid level of radar transmitting wave f.
3. measuring method according to claim 1, is characterized in that, the liquid level of described fluid meets following relational expression: L=CT/2,
Wherein, L represents the liquid level of fluid and the distance value of ultrasonic level gage, and C is hyperacoustic speed, and T is for ultrasonic level gage is from launching ultrasonic pulse to the time interval received needed for ultrasonic pulse.
4. measuring method according to claim 3, is characterized in that, described ultrasonic level gage is installed on the top of described drainage pipeline, and the liquid level h of described fluid equals the setting height(from bottom) D of described ultrasonic level gage and the difference of described distance value L.
5. measuring method according to claim 1, is characterized in that, the flow area of described fluid meets following relational expression:
S = ( π 2 + a r c s i n h - R R ) R 2 + ( h - R ) R 2 - ( h - R ) 2
Wherein, h is the liquid level of described fluid, and R is the pipe radius of described drainage pipeline, and S is the flow area of described fluid.
6. a measuring system for contactless drainage pipeline fluid flow, is characterized in that, described measuring system comprises:
One ultrasonic level gage, is installed on the top of described drainage pipeline, and it comprises a probe, also receives for launching ultrasonic pulse the ultrasonic echo reflected by described flow surface, exports the voltage signal of the liquid level of the described drainage pipeline of reflection; And
One electric flow meter, comprises antenna plate and signal-processing board, and described antenna plate receiving antenna signal also exports a difference frequency signal after amplification, mixing and filtering; Described signal-processing board is connected with described antenna plate, for sampling to the difference frequency signal received, in conjunction with the tilt angles of antenna plate, determine surface velocity and the flow direction of described fluid, and according to from described ultrasonic level gage, reflect that the voltage signal of the liquid level of described drainage pipeline calculates the instantaneous delivery information of described fluid.
7. measuring system according to claim 6, it is characterized in that, described electric flow meter and described ultrasonic level gage are fixedly mounted on same corrosion resistant plate by screw, and the frequency of operation of described electric flow meter is 24GHz, and the ultrasonic pulse frequency of described ultrasonic level gage is 40kHz.
8. measuring system according to claim 6, it is characterized in that, described measuring system also comprises a remote-terminal unit (RemoteTerminalUnit, and a high power lithium battery RTU), described remote-terminal unit is connected with described electric flow meter, described high power lithium battery and an omnidirectional antenna, for the data that receive from described omnidirectional antenna and the data sent from described electric flow meter.
9. measuring system according to claim 8, is characterized in that, described remote-terminal unit is the SIM card of mobile communication terminal.
10. measuring system according to claim 8, is characterized in that, described electric flow meter also comprises a mechanical interface and an electric connector, and described mechanical interface is used for mounting and fixing bracket, and described electric connector is for connecting described remote-terminal unit.
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