CN108981832A - A kind of wastewater flow measuring circuit and device - Google Patents
A kind of wastewater flow measuring circuit and device Download PDFInfo
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- CN108981832A CN108981832A CN201810847811.3A CN201810847811A CN108981832A CN 108981832 A CN108981832 A CN 108981832A CN 201810847811 A CN201810847811 A CN 201810847811A CN 108981832 A CN108981832 A CN 108981832A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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- Physics & Mathematics (AREA)
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- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention belongs to field of measuring technique, a kind of wastewater flow measuring circuit and device are provided.The circuit includes: Microwave transceiver unit, for the transmitting detection microwave signal into the ducts, and receives the retroeflection microwave signal of return；Signal processing unit is connect with the Microwave transceiver unit, and the signal processing unit is used to carry out signal processing to retroeflection microwave signal；D/A conversion unit is connect with the signal processing unit, and the signal that the signal processing unit exports is converted to digital signal；Control unit is connect with the Microwave transceiver unit and the D/A conversion unit, is controlled the signal transmitting of the Microwave transceiver unit, is received the digital signal, export wastewater flow signal according to the digital signal；Wireless communication unit is connect with described control unit, for the wastewater flow signal to be sent to host computer.
Description
Technical field
The invention belongs to field of measuring technique more particularly to a kind of wastewater flow measuring circuit and devices.
Background technique
Waste water includes sanitary wastewater and trade effluent, and the discharge of waste water lacks effectively metering, and wastewater discharge is often root
According to water consumption estimation, causes sewage discharge responsibility unknown, be to cause environmental pollution one of the major reasons.Due to discharge of wastewater at
Divide multiplicity, and usually flowing, belongs to the multiphase flow that complex condition includes solid and foam
Dynamic, domestic and international market does not have at low cost, precision high and widely applied waste water stream meter product at present.
Non-intrusion type wastewater flow measurement is a kind of mode using non-broken wall detects in pipeline whether have waste water flowing simultaneously
The method that wastewater flow in pipeline can be calculated.It is currently used primarily in the non-intrusion type waste water stream meter that sewage treatment plant uses
Including open channel supersonic flowmeter, electromagnetism waste water stream meter and ultrasonic wave waste water stream meter.Open channel supersonic flowmeter is suitable for
Flow is larger, water level is higher, the wider open-channel flow measurement of width of the channel, is not suitable for the substance that containing a large amount of floating substances and easily deposits
Medium-small flow measurement, such as not applicable flow measurement with municipal wastewater underground pipe network monitors.Electromagnetic flowmeter is based on faraday
The law of electromagnetic induction and it is manufactured, can accomplish non-intrusion measurement；But probe directly contacts detected fluid；Therefore probe vulnerable to
Pollution influences measurement accuracy, increases maintenance cost；Furthermore measurement accuracy is influenced by fluid dielectric constant, conductivity etc., uncomfortable
Synthesis point waste water complicated and changeable；Electromagnetic flowmeter also requires to be completely filled with liquid in measurement pipeline, and life and industrial wastewater
It is usually non-full pipe flowing in pipeline, therefore is not able to satisfy this basic demand of electromagnetic flowmeter.Ultrasonic flowmeter be with
" speed difference method " is principle, measures the instrument of fluid flow in round tube.Since sound wave is in the reflection of gas-liquid interface, containing solid and
The sensitivity and precision of sensor will be greatly reduced in the multiphase medium of foam；Furthermore ultrasonic flowmeter also requires that measurement pipeline
It is inside completely filled with liquid, therefore is not suitable for the wastewater flow metering of non-full pipe under normal conditions.
Summary of the invention
The purpose of the present invention is to provide a kind of wastewater flow measuring circuit and devices, it is intended to solve traditional technical solution
Present in be applicable in the problems such as scene condition is harsh, and measuring accuracy is low.
A kind of wastewater flow measuring circuit, is set in ducts, and the circuit includes:
Microwave transceiver unit, for the transmitting detection microwave signal into the ducts, and the retroeflection for receiving return is micro-
Wave signal；
Signal processing unit is connect with the Microwave transceiver unit, and the signal processing unit is used to believe retroeflection microwave
Number carry out signal processing；
D/A conversion unit is connect with the signal processing unit, and the signal that the signal processing unit is exported is converted
For digital signal；
Control unit is connect with the Microwave transceiver unit and the D/A conversion unit, controls the microwave transmitting and receiving
The signal of unit emits, and receives the digital signal, exports wastewater flow signal according to the digital signal；
Wireless communication unit is connect with described control unit, for the wastewater flow signal to be sent to host computer.
In one embodiment, the Microwave transceiver unit includes multiple microwave transceivers, the multiple microwave transmitting and receiving
Device ladder on waste pipe extending direction is arranged.
In one embodiment, the detection microwave signal frequency of the multiple microwave transceiver transmitting is identical, described more
A microwave transceiver emits detection microwave signal according to fixed time sequence.
In one embodiment, the detection microwave signal frequency of each spontaneous emission of the multiple microwave transceiver is different,
The multiple microwave transceiver emits detection microwave signal simultaneously.
In one embodiment, the inner and outer surfaces of the tube wall of the ducts are uniformly coated with antiradar coatings.
In one embodiment, the inner wall of the ducts is coated with fixed coating, the roughness of the coating
It is constant, guarantee that the roughness of inner wall is constant.
It in one embodiment, further include display unit, the display unit is connect with described control unit, described aobvious
Show unit for showing current wastewater flow data.
In one embodiment, the ducts and waste pipe are at certain inclination angle, the model at the inclination angle
It encloses for 0 to 60 degree.
In addition, additionally provide a kind of wastewater flow measuring device, the wastewater flow measuring device include: ducts with
And it is set to the above-mentioned wastewater flow measuring circuit in the ducts.
Above-mentioned wastewater flow measuring circuit, by sending microwave at bottom signal and receiving microwave at the top of waste pipe
Reflect signal, according to microwave reflection signal strength calculate between microwave receiving-transmitting device and the waste water water surface or microwave reflection block away from
From to calculate water surface elevation in waste pipe, control unit calculates waste water flow velocity according to water surface elevation in pipeline pipeline, most
Water flow is calculated by waste water flow velocity and liquid level afterwards, calculated result wireless communication module transmits the result to long-range end
End, measurement accuracy is high, is applicable in for the waste water measurement under a variety of situations, and can be by remotely monitoring wastewater flow situation.
Detailed description of the invention
Fig. 1 is the wastewater flow measuring device structural schematic diagram that present pre-ferred embodiments provide；
Fig. 2 is the electrical block diagram of wastewater flow measuring circuit in wastewater flow measuring device shown in FIG. 1；
Fig. 3 is the wastewater flow measuring device diagrammatic cross-section that present pre-ferred embodiments provide；
Fig. 4 is another diagrammatic cross-section of wastewater flow measuring device that present pre-ferred embodiments provide；
Fig. 5 is the circuit diagram for the signal processing unit that present pre-ferred embodiments provide.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows the structural schematic diagram of the wastewater flow measuring device of present pre-ferred embodiments offer, for the ease of
Illustrate, only the parts related to this embodiment are shown, and details are as follows:
A kind of wastewater flow measuring device 100, the wastewater flow measuring device 100 include: ducts 2 and are set to
Wastewater flow measuring circuit 1 in the ducts 2.The ducts 2 are integrally formed with waste water tunnel and are set to waste water
The installation cavity of channels peripheral, wastewater flow measuring circuit 1 are set in the installation cavity.
Wherein, wastewater flow measuring circuit 1 includes: Microwave transceiver unit 10, signal processing unit 20, D/A conversion unit
30, control unit 40 and wireless communication unit 50.
Microwave transceiver unit 10 for the transmitting detection microwave signal into the ducts 2, and receives the retroeflection of return
Microwave signal flows through the wastewater flow in ducts 2 using the detection microwave signal detection of transmitting.Specifically, microwave is received
Bill member 10 includes multiple microwave transceivers, and multiple microwave transceiver ladder on 2 extending direction of ducts is arranged.It is preferred that
, Microwave transceiver unit 10 includes at least three microwave transceiver, by taking the scheme of 3 microwave transceivers as an example, for sustained height
Waste water liquid level will form corresponding 3 different height d1、d2、d3, i.e. 3 microwave transceivers and waste water liquid level form 3 differences
Reflective distance, due to receive signal intensity with reflective distance increase in periodically concussion decaying, thus in exhausted water
The detection microwave signal of 3 varying strengths is generated on face, and the detection microwave signal of 3 varying strengths can uniquely determine one
A liquid level value.
Simultaneously as the detection microwave signal frequency of multiple microwave transceiver transmittings is identical, in order to avoid microwave transceiver
Between interfere with each other, multiple microwave transceivers according to fixed time sequence emit detection microwave signal, in this way, the same time can only be same
Mono- microwave transceiver of Shi Yunhang will not generate signal interference between different microwave transceivers.Preferably, between microwave transceiver
Signal transmitting use lesser time interval, error caused by avoiding liquid level from quickly changing.In another preferred embodiment, more
The detection microwave signal frequency of each spontaneous emission of a microwave transceiver is different, and multiple microwave transceivers emit detection microwave letter simultaneously
Number, interference will not be generated between the detection microwave signal of different frequencies, without accurately being controlled microwave transceiver.
Signal processing unit 20 is connect with Microwave transceiver unit 10, signal processing unit 20 be used for retroeflection microwave signal into
Row signal processing.Specifically, signal processing unit 20 include preceding sequentially connected first amplification module 21, frequency mixing module 22,
Filter module 23 and the second amplification module 24, the first amplification module 21 to the received retroeflection microwave signal of signal processing unit 20 into
Row enhanced processing, the signal that frequency mixing module 22 is used to export the first amplification module 21 carry out Frequency mixing processing, and frequency mixing module 22 is defeated
Signal out by the filtering processing of filter module 23, the second amplification module 24 secondary enhanced processing after output to digital-to-analogue conversion
Unit 30.D/A conversion unit 30 is connect with signal processing unit 20, and the signal that signal processing unit 20 exports is converted to mould
Quasi- signal, so that control unit 40 is further processed signal.
Control unit 40 is connect with Microwave transceiver unit 10 and D/A conversion unit 30, controls Microwave transceiver unit 10
Signal transmitting, and receive D/A conversion unit 30 output analog signal signal, according to analog signal output wastewater flow believe
Number.The inner and outer surfaces of the tube wall of ducts 2 are uniformly coated with antiradar coatings, when being flowed in ducts 2 without waste water, inspection
Surveying microwave signal will be absorbed by the tube wall of ducts 2, and transceiver only needs a microwave transceiver without echo-signal
Determine the waste water flow regime in ducts 2.When detecting does not have water flow in pipeline, circuit will enter battery saving mode,
Only one microwave transceiver is in running order in a power-save mode, other microwave transceivers will not open operation, when
One microwave transceiver detects in pipeline again when having water flow, and circuit is by turn-on flow rate detection pattern, all microwave transmitting and receivings
Device will be restarted and be run under the control of control unit 40.
Further, wireless communication unit 50 is connect with control unit 40, for wastewater flow signal to be sent to host computer；
It further include display unit and operation module, display unit is connect with control unit 40, and display unit is for showing current waste water
Data on flows, operation module are connect with described control unit 40, and administrative staff is facilitated to carry out attended operation and maintenance.
It is understood that wastewater flow measuring device 100 provided by the embodiment of the present invention matches casing using dedicated
Road 2, ducts 2 and waste pipe are at certain inclination angle, specifically, the range at inclination angle is 0 to 60 degree, to guarantee to measure
As a result consistent.In actual application, for waste pipe currently in use, when installation, can cut off a segment pipe, and with this
Ducts 2 in inventive embodiments substitute.The inner wall of ducts 2 is coated with fixed coating, and the roughness of coating is constant,
Guarantee that the roughness of inner wall is constant, to improve the accuracy of measurement.
The wastewater flow measuring circuit 1 of the bright embodiment of the present invention from the principle below:
Microwave transceiver unit 10 is micro- to exhausted water surface launching specific wavelength by transmitting antenna using single-frequency microwave generator
Wave.Assuming that the frequency of Microwave emission signal, initial phase are respectively f0Φ0, t is the time, then emits signal VT, echo-signal VR
It can indicate respectively are as follows:
VT(t)=Acos (2 π f0t+Φ0)
VR(t)=η Acos (2 π f0t+Φ0-Φ)
In formula: A is the amplitude for emitting signal, and η is the attenuation coefficient of echo signal amplitude, arrives reflecting surface with transmitting antenna
Distance is related, and Φ is the phase difference between echo-signal and transmitting signal.
Finally obtained signal is after signal processing circuit
VR(t)*VT(t)=12 η A*A [cos (4 π f0t+2Φ0-Φ)+cos(Φ)]
Above-mentioned formula can further abbreviation are as follows:
Wherein, VoutFor received signal strength, V0It is transmitting antenna and reflecting surface (wastewater surface) for average signal strength L
Distance, k1, k2For parameter to be measured, for fixed structure, which is constant.
After wastewater surface height is calculated in control unit 40, the waterpower half of waste water can be calculated by the program prestored
Diameter.Roughness corresponding to ducts 2 can be found out by the material of ducts 2, it can be with according to the angle value at inclination angle
Waste water waterpower slope line slope is obtained, current waste water flow velocity can be calculated by Manning formula.Manning formula expression formula is as follows:
Wherein: V is the average speed (m/s) in section；K is conversion coefficient；N is Gauckler- Manning coefficient, is zero dimension
Amount；RhFor hydraulic radius (m)；S is the slope of waterpower slope line or linear headloss, if the depth of water is certain value, value
Equal to the slope of pipeline.N depends on the roughness of ducts 2, is the coarse situation of concentrated expression pipe duct wall surface to water currents
A coefficient, value generally measures by experimental data, and when use can table look-up selection.It can be calculated by waste water mean flow rate
Wastewater flow Q:
Q=v × A
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of wastewater flow measuring circuit, is set in ducts, which is characterized in that the circuit includes:
Microwave transceiver unit for the transmitting detection microwave signal into the ducts, and receives the retroeflection microwave letter of return
Number；
Signal processing unit is connect with the Microwave transceiver unit, the signal processing unit be used for retroeflection microwave signal into
Row signal processing；
D/A conversion unit is connect with the signal processing unit, and the signal that the signal processing unit exports is converted to number
Word signal；
Control unit is connect with the Microwave transceiver unit and the D/A conversion unit, controls the Microwave transceiver unit
Signal transmitting, receive the digital signal, according to the digital signal export wastewater flow signal；
Wireless communication unit is connect with described control unit, for the wastewater flow signal to be sent to host computer.
2. wastewater flow measuring circuit as described in claim 1, which is characterized in that the Microwave transceiver unit includes multiple micro-
Wave transceiver, the multiple microwave transceiver ladder on waste pipe extending direction are arranged.
3. wastewater flow measuring circuit as claimed in claim 2, which is characterized in that the inspection of the multiple microwave transceiver transmitting
It is identical to survey microwave signal frequency, the multiple microwave transceiver emits detection microwave signal according to fixed time sequence.
4. wastewater flow measuring circuit as claimed in claim 2, which is characterized in that the multiple microwave transceiver it is each spontaneous
The detection microwave signal frequency penetrated is different, and the multiple microwave transceiver emits detection microwave signal simultaneously.
5. wastewater flow measuring circuit as described in claim 1, which is characterized in that the tube wall of the ducts it is inside and outside
Surface is uniformly coated with antiradar coatings.
6. wastewater flow measuring circuit as described in claim 1, which is characterized in that the inner wall of the ducts is coated with solid
The roughness of fixed coating, the coating is constant, guarantees that the roughness of inner wall is constant.
7. wastewater flow measuring circuit as described in claim 1, which is characterized in that further include display unit, the display is single
Member is connect with described control unit, and the display unit is for showing current wastewater flow data.
8. wastewater flow measuring circuit as described in claim 1, which is characterized in that the ducts and waste pipe are at one
Fixed inclination angle, the range at the inclination angle are 0 to 60 degree.
9. a kind of wastewater flow measuring device, which is characterized in that the wastewater flow measuring device includes: ducts and sets
The wastewater flow measuring circuit as claimed in any one of claims 1 to 8 being placed in the ducts.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810847811.3A CN108981832B (en) | 2018-07-27 | 2018-07-27 | Waste water flow measuring circuit and device |
| PCT/CN2019/097528 WO2020020242A1 (en) | 2018-07-27 | 2019-07-24 | Wastewater flow measuring circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810847811.3A CN108981832B (en) | 2018-07-27 | 2018-07-27 | Waste water flow measuring circuit and device |
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| Publication Number | Publication Date |
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| CN108981832A true CN108981832A (en) | 2018-12-11 |
| CN108981832B CN108981832B (en) | 2020-04-21 |
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| CN201810847811.3A Active CN108981832B (en) | 2018-07-27 | 2018-07-27 | Waste water flow measuring circuit and device |
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| WO (1) | WO2020020242A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020020242A1 (en) * | 2018-07-27 | 2020-01-30 | 南方科技大学 | Wastewater flow measuring circuit and device |
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| Publication number | Publication date |
|---|---|
| CN108981832B (en) | 2020-04-21 |
| WO2020020242A1 (en) | 2020-01-30 |
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