CN117191139A - Ultrasonic water meter - Google Patents
Ultrasonic water meter Download PDFInfo
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- CN117191139A CN117191139A CN202311464699.2A CN202311464699A CN117191139A CN 117191139 A CN117191139 A CN 117191139A CN 202311464699 A CN202311464699 A CN 202311464699A CN 117191139 A CN117191139 A CN 117191139A
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- temperature
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- water meter
- pipe section
- ultrasonic water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 30
- 239000000919 ceramic Substances 0.000 claims abstract description 24
- 239000012790 adhesive layer Substances 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 19
- 238000012360 testing method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention relates to the technical field of ultrasonic water meters, and discloses an integrated ultrasonic water meter, which comprises a control circuit, an integrated pipe section, 2 transducers and a reflecting mirror; the transducer comprises piezoelectric ceramics and an adhesive layer; the control circuit comprises a temperature calculation module, a flow calculation module and a temperature compensation module; the connection relation is as follows: the control circuit is connected with 2 piezoelectric ceramics through wires, the 2 piezoelectric ceramics are respectively adhered to the outer wall of the integrated pipe section through adhesive layers, and the reflecting mirror is arranged on the inner wall of the integrated pipe section. According to the invention, in the integrated pipe section, the temperature is calculated by transmitting radial vibration of the transducer in the pipe diameter, so that the influence of a water flow state on temperature measurement is avoided, high flow measurement precision is ensured, meanwhile, the temperature is compensated by increasing the temperature measurement frequency according to the temperature change condition, and the flow calculation error is reduced, thereby realizing the purpose of ensuring the accuracy of temperature measurement on the premise of not independently arranging a temperature measurement device.
Description
Technical Field
The invention relates to the technical field of ultrasonic water meters, in particular to an integrated ultrasonic water meter.
Background
The ultrasonic water meter has no movable parts, so that the ultrasonic water meter has no influence on the water flow state in the test process, and the like, and is widely focused in the water meter metering field. The ultrasonic water meter calculates the flow velocity in water by detecting the time difference of the forward flow and the backward flow of ultrasonic waves in the water, so as to deduce flow information.
Because the sound velocity of the water and the water temperature show related characteristics, the traditional ultrasonic water meter needs to be provided with a temperature sensor to compensate the flow calculation error caused by temperature change. In addition, the sound velocity of ultrasonic wave propagating in water can be calculated according to the ultrasonic wave transmitting and receiving time and the ultrasonic wave propagation distance (refer to Chinese patent CN 106679745B), and then the corresponding water temperature can be calculated according to the relationship between the underwater sound velocity and the temperature. In this case, similar to the flow rate calculation, the temperature calculation is affected by the water flow state, and the measurement accuracy is lowered when the water flow state is affected by bubbles, mirror scaling, or the like.
Disclosure of Invention
Aiming at the defects and drawbacks existing in the prior art, the invention provides the integrated ultrasonic water meter, the optimal solid propagation frequency of ultrasonic waves propagated in a pipe section is obtained through frequency sweep, the temperature in the water pipe is obtained by utilizing ultrasonic signal information in the pipe diameter, the influence of the water flow state on temperature measurement is avoided, the temperature measurement frequency is increased by monitoring the temperature change state, the temperature calculation is compensated, and the flow measurement precision of the ultrasonic water meter is improved.
The object of the invention can be achieved by the following technical scheme.
An integrated ultrasonic water meter comprises a control circuit, an integrated pipe section, 2 transducers and 2 or 3 reflectors.
The transducer comprises piezoelectric ceramics and an adhesive layer.
The control circuit comprises a temperature calculation module, a flow calculation module and a temperature compensation module.
The connection relation is as follows: the control circuit is connected with 2 piezoelectric ceramics through wires, and the 2 piezoelectric ceramics are respectively adhered to the outer wall of one side of the integrated pipe section through adhesive layers; when the total number of the reflectors is 2, 2 reflectors are arranged on the inner wall of the other side of the integral pipe section; when the total number of the reflectors is 3, 1 reflector is arranged on the inner wall of the same side of the integral pipe section, and the other 2 reflectors are arranged on the inner wall of the other side of the integral pipe section.
Preferably, the control circuit may emit 2 different frequency ultrasonic signals, a flow metering signal and a temperature metering signal, respectively.
Preferably, the flow metering signal frequency is the resonant frequency of the thickness vibration of the transducer, and the temperature metering signal frequency is the resonant frequency of the radial vibration of the transducer.
Preferably, the control circuit sweeps the upstream transducer when the maximum signal amplitude received by the downstream transducer is less than 40 dB; the frequency at this time is the latest temperature measurement signal frequency; the sweep frequency step length is0.5kHz; the sweep frequency range isWhere x is the flow metering signal frequency and n is the ratio of the piezoelectric ceramic diameter to the thickness.
Preferably, the flow metering signals are transmitted through each mirror, and the transmission route is U-shaped.
Preferably, the temperature measurement signal is transmitted through the pipe wall of the integrated pipe section.
Preferably, the flow calculation of the ultrasonic water meter comprises the following steps.
S1, ultrasonic water meter upstream transducer at t 0 Transmitting temperature measurement signals at the moment, and at t, the downstream transducer 1 The signal is received at the moment.
S2, recording the temperature measurement signal propagation time Δt=t 1 -t 0 。
And S3, calculating an instantaneous temperature T=k which is a time coefficient and is related to the propagation speed of sound in the integral pipe section.
S4, the upstream transducer and the downstream transducer transmit ultrasonic signals, and the instantaneous flow V is calculated according to the propagation time difference of the ultrasonic signals in water and the instantaneous temperature T.
Preferably, during normal operation of the ultrasonic water meter, when three consecutive instantaneous temperatures T are obtained n 、T n+1 、T n+2 Satisfy the following requirementsWhen the temperature compensation mode is started; in the temperature compensation mode, when meetingAnd when the device enters a normal working mode. One metering cycle in normal operation mode is "T n —V n "; one metering cycle in temperature compensation mode is "T n —V n —T n+1 ", the temperature coefficient used for flow measurement at this time。
The beneficial technical effects of the invention are as follows: in integral type pipeline section, propagate through transducer radial vibration in the pipe diameter and calculate the temperature, avoided rivers state to cause the influence to the temperature measurement, guarantee high flow measurement precision, simultaneously, to the temperature change condition, increase temperature measurement frequency and compensate the temperature, reduced flow calculation error to the realization is under the prerequisite that need not to set up temperature measurement device alone, guarantees temperature measurement's accuracy.
Drawings
Fig. 1 is a front cross-sectional view of an ultrasonic water meter according to embodiment 1 of the present invention.
Fig. 2 is a diagram showing signal transmission paths of temperature measurement and flow measurement in example 1 of the present invention.
Fig. 3 is a front view of a transducer of the present invention.
Fig. 4 is a top view of a transducer of the present invention.
FIG. 5 is a flow chart of the present invention.
FIG. 6 is a graph of the propagation time of a test thermometer signal versus ambient temperature in example 1 of the present invention.
Fig. 7 is a front cross-sectional view of an ultrasonic water meter in example 2 of the present invention.
Fig. 8 is a diagram showing the signal transmission paths of temperature measurement and flow measurement in example 2 of the present invention.
Reference numerals: 1 is a control circuit, 2 is an upstream transducer, 201 is piezoelectric ceramic, 202 is a glue layer, 3 is a downstream transducer, 4 is an integrated pipe section, 5 is an upstream mirror, 6 is a downstream mirror, and 7 is an intermediate mirror.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1: as shown in fig. 1, the integrated ultrasonic water meter comprises a control circuit 1, an integrated pipe section 4, an upstream transducer 2, a downstream transducer 3, an upstream reflecting mirror 5 and a downstream reflecting mirror 6.
The control circuit 1 comprises a temperature calculation module, a flow calculation module and a temperature compensation module.
The transducer comprises a piezoelectric ceramic 201, a glue layer 202.
The connection relation is as follows: the control circuit 1 is connected with 2 piezoelectric ceramics 201 through wires, and the piezoelectric ceramics 201 are connected with the integrated pipe section 4 through an adhesive layer 202.
As shown in fig. 3 and 4, in this embodiment, the thickness of the piezoelectric ceramic 201 is 8mm, the diameter is 1mm, and the piezoelectric ceramic 201 positioning groove is located on the same side of the integral pipe section 4, the adhesive layer 202 fills the positioning groove and overflows, and the outer diameter of the adhesive layer 202 is ensured to be larger than the outer diameter of the piezoelectric ceramic 201.
The control circuit 1 can emit 2 ultrasonic signals with different frequencies, namely a flow metering signal and a temperature metering signal.
The flow metering signal is the resonance frequency 2MHz of the thickness vibration of the transducer, and the temperature metering signal is the resonance frequency 262KHz of the radial vibration of the transducer.
As shown in fig. 2, the transmission route of the flow metering signal is "U", the propagation medium is an integral pipe section 4, water, an upstream mirror 5, and a downstream mirror 6, and the temperature metering signal is transmitted through the integral pipe section 4.
The control circuit 1 sweeps the frequency of the upstream transducer 2, the sweep frequency range is 200-330 kHz, the step length is 0.5KHz, the maximum signal amplitude received by the downstream transducer 3 is determined, and the frequency at the moment is 262KHz of the temperature measurement frequency.
During long-term service, the transducer has aging phenomenon, and the resonant frequency may shift, so when the amplitude of the signal received by the downstream transducer 3 is lower than 40dB, the frequency sweeping step is performed again, and the temperature measuring frequency is updated.
The flow calculation includes the following steps.
S1, ultrasonic water meter upstream transducer 2 at t 0 The temperature measurement signal is emitted at the moment, and the downstream transducer 3 at t 1 The signal is received at the moment.
S2, recording the temperature measurement signal propagation time Δt=t 1 -t 0 。
S3, the ultrasonic water meter temperature t=k×Δt, k being a time coefficient, wherein k is related to the propagation speed of sound in the integral pipe section 4.
As shown in fig. 6, the relationship between the temperature measurement propagation time and the ambient temperature is obtained by using the transducer radial vibration test, the solid line is the actual test result, the dotted straight line is the fitting result, and the near linear relationship proves the feasibility and the reliability of the temperature measurement mode.
S4, the upstream transducer and the downstream transducer transmit ultrasonic signals, and the instantaneous flow V is calculated according to the propagation time difference of the ultrasonic waves in water and the combination temperature T.
During normal operation of the ultrasonic water meter, when three continuous instantaneous temperatures T are obtained n 、T n+1 、T n+2 Satisfy the following requirementsWhen the temperature compensation mode is started; in the temperature compensation mode, when meetingAnd when the device enters a normal working mode. One metering cycle in normal operation mode is "T n —V n "; one metering cycle in temperature compensation mode is "T n —V n —T n+1 ", the temperature coefficient used for flow measurement at this time。
Example 2: as shown in fig. 7, the integrated ultrasonic water meter comprises a control circuit 1, an integrated pipe section 4, an upstream transducer 2, a downstream transducer 3, an upstream mirror 5, a downstream mirror 6 and an intermediate mirror 7.
The control circuit 1 comprises a temperature calculation module, a flow calculation module and a temperature compensation module.
The transducer comprises a piezoelectric ceramic 201, a glue layer 202.
The connection relation is as follows: the control circuit 1 is connected with 2 piezoelectric ceramics 201 through wires, and the piezoelectric ceramics 201 are connected with the integrated pipe section 4 through an adhesive layer 202.
As shown in fig. 3, in this embodiment, the thickness of the piezoelectric ceramic 201 is 8mm, the diameter is 1mm, and the piezoelectric ceramic 201 positioning groove is located on the same side of the integral pipe section 4, the adhesive layer 202 fills the positioning groove and overflows, so that the outer diameter of the adhesive layer 202 is ensured to be larger than that of the piezoelectric ceramic 201.
The control circuit 1 can emit 2 ultrasonic signals with different frequencies, namely a flow metering signal and a temperature metering signal.
The flow metering signal is the resonance frequency of the thickness vibration of the transducer, and the temperature metering signal is the resonance frequency of the radial vibration of the transducer.
As shown in fig. 8, the transmission line of the flow measurement signal is "W", and the propagation medium is an integral pipe section 4, water, an upstream mirror 5, an intermediate mirror 7, and a downstream mirror 6, and the temperature measurement signal is transmitted through the integral pipe section 4.
During long-term service, the transducer has aging phenomenon, and the resonant frequency may shift, so when the amplitude of the signal received by the downstream transducer 3 is lower than 40dB, the frequency sweeping step is performed again, and the temperature measuring frequency is updated.
The flow calculation includes the following steps.
S1, ultrasonic water meter upstream transducer at t 0 Transmitting temperature measurement signals at the moment, and at t, the downstream transducer 1 The signal is received at the moment.
S2, recording the temperature measurement signal propagation time Δt=t 1 -t 0 。
S3, the ultrasonic water meter temperature t=k×Δt, k being a time coefficient, wherein k is related to the propagation speed of sound in the integral pipe section 4.
As shown in fig. 6, the relationship between the temperature measurement propagation time and the ambient temperature is obtained by using the transducer radial vibration test, the solid line is the actual test result, the dotted straight line is the fitting result, and the near linear relationship proves the feasibility and the reliability of the temperature measurement mode.
S4, the upstream transducer and the downstream transducer transmit ultrasonic signals, and the instantaneous flow V is calculated according to the propagation time difference of the ultrasonic waves in water and the combination temperature T.
During normal operation of the ultrasonic water meter, when three continuous instantaneous temperatures are obtainedT n 、T n+1 、T n+2 Satisfy the following requirementsWhen the temperature compensation mode is started; in the temperature compensation mode, when meetingWhen the device is in a normal working mode; one metering cycle in normal operation mode is "T n —V n "; one metering cycle in temperature compensation mode is "T n —V n —T n+1 ", the temperature coefficient used for flow measurement at this time。
The above embodiments are illustrative of the specific embodiments of the present invention, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the invention, so that all such equivalent embodiments are intended to be within the scope of the invention.
Claims (8)
1. An integrated ultrasonic water meter is characterized by comprising a control circuit, an integrated pipe section, 2 transducers and 2 or 3 reflectors;
the transducer comprises piezoelectric ceramics and an adhesive layer;
the control circuit comprises a temperature calculation module, a flow calculation module and a temperature compensation module;
the connection relation is as follows: the control circuit is connected with 2 piezoelectric ceramics through wires, and the 2 piezoelectric ceramics are respectively adhered to the outer wall of one side of the integrated pipe section through adhesive layers; when the total number of the reflectors is 2, 2 reflectors are arranged on the inner wall of the other side of the integral pipe section; when the total number of the reflectors is 3, 1 reflector is arranged on the inner wall of the same side of the integral pipe section, and the other 2 reflectors are arranged on the inner wall of the other side of the integral pipe section.
2. The integrated ultrasonic water meter of claim 1, wherein the control circuit is capable of emitting 2 different frequency ultrasonic signals, a flow metering signal and a temperature metering signal, respectively.
3. The integrated ultrasonic meter of claim 2, wherein the flow metering signal frequency is a resonant frequency of thickness vibration of the transducer and the temperature metering signal frequency is a resonant frequency of radial vibration of the transducer.
4. The integrated ultrasonic water meter of claim 2, wherein the control circuit sweeps the upstream transducer when the maximum signal amplitude received by the downstream transducer is less than 40 dB;
the frequency at this time is the latest temperature measurement signal frequency; the sweep frequency step length is 0.5kHz; the sweep frequency range is；
Where x is the frequency of the flow metering signal and n is the ratio of the diameter to the thickness of the piezoelectric ceramic.
5. The integrated ultrasonic water meter of claim 1, wherein the flow metering signals are transmitted through each mirror in a "U" shape.
6. An integral ultrasonic water meter as defined in claim 1, wherein the temperature measurement signal is transmitted through the wall of the integral tube.
7. The integrated ultrasonic water meter of claim 1, wherein the flow calculation of the ultrasonic water meter comprises the steps of:
s1, ultrasonic water meter upstream transducer at t 0 Transmitting temperature measurement signals at the moment, and at t, the downstream transducer 1 Receiving the signal at the moment;
s2, recording the temperature measurement signal propagation time Δt=t 1 -t 0 ；
S3, calculating an instantaneous temperature T=k which is a time coefficient and is related to the propagation speed of sound in the integral pipe section;
s4, the upstream transducer and the downstream transducer transmit ultrasonic signals, and the instantaneous flow V is calculated according to the propagation time difference of the ultrasonic signals in water and the instantaneous temperature T.
8. An integrated ultrasonic water meter according to claim 7, wherein during normal operation of the ultrasonic water meter, when three consecutive instantaneous temperatures T are obtained n 、T n+1 、T n+2 Satisfy the following requirementsWhen the temperature compensation mode is started; in the temperature compensation mode, when +.>When the device is in a normal working mode;
one metering cycle in normal operation mode is "T n —V n "; one metering cycle in temperature compensation mode is "T n —V n —T n+1 ", the temperature coefficient used for flow measurement at this time。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311464699.2A CN117191139A (en) | 2023-11-07 | 2023-11-07 | Ultrasonic water meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311464699.2A CN117191139A (en) | 2023-11-07 | 2023-11-07 | Ultrasonic water meter |
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| Publication Number | Publication Date |
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| CN117191139A true CN117191139A (en) | 2023-12-08 |
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| CN202311464699.2A Pending CN117191139A (en) | 2023-11-07 | 2023-11-07 | Ultrasonic water meter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07139982A (en) * | 1993-11-18 | 1995-06-02 | Mitsubishi Heavy Ind Ltd | Ultrasonic flowmeter |
| JP2004264251A (en) * | 2003-03-04 | 2004-09-24 | Fuji Electric Retail Systems Co Ltd | Temperature measuring instrument |
| GB0922466D0 (en) * | 2009-12-21 | 2010-02-03 | Tecom Analytical Systems | Flow measuring apparatus |
| CN102749154A (en) * | 2012-07-27 | 2012-10-24 | 深圳市建恒测控股份有限公司 | Method, device and energy meter for measuring temperature of fluid medium by ultrasonic wave |
| WO2014021846A1 (en) * | 2012-07-31 | 2014-02-06 | Siemens Aktiengesellschaft | Indirect transducer temperature measurement |
-
2023
- 2023-11-07 CN CN202311464699.2A patent/CN117191139A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07139982A (en) * | 1993-11-18 | 1995-06-02 | Mitsubishi Heavy Ind Ltd | Ultrasonic flowmeter |
| JP2004264251A (en) * | 2003-03-04 | 2004-09-24 | Fuji Electric Retail Systems Co Ltd | Temperature measuring instrument |
| GB0922466D0 (en) * | 2009-12-21 | 2010-02-03 | Tecom Analytical Systems | Flow measuring apparatus |
| CN102749154A (en) * | 2012-07-27 | 2012-10-24 | 深圳市建恒测控股份有限公司 | Method, device and energy meter for measuring temperature of fluid medium by ultrasonic wave |
| WO2014021846A1 (en) * | 2012-07-31 | 2014-02-06 | Siemens Aktiengesellschaft | Indirect transducer temperature measurement |
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