CN107271715A - A kind of device and measuring method for measuring pipeline rate of flow of fluid - Google Patents
A kind of device and measuring method for measuring pipeline rate of flow of fluid Download PDFInfo
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- CN107271715A CN107271715A CN201710427397.6A CN201710427397A CN107271715A CN 107271715 A CN107271715 A CN 107271715A CN 201710427397 A CN201710427397 A CN 201710427397A CN 107271715 A CN107271715 A CN 107271715A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
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Abstract
The invention discloses a kind of device and measuring method for measuring pipeline rate of flow of fluid, speed measuring device includes acoustic resonance part, electricity resonance portion and acoustic-electric conversion equipment, wherein, acoustic resonance part includes slender pipeline and standing wave tube；Slender pipeline is acoustic resonant cavity, transducer and numeral microphone are acoustic-electric conversion equipment, electricity resonance portion is amplified and filtering process to electric signal, rate of flow of fluid is calculated by measuring two-way higher order resonance frequencies skew, standing wave tubular construction solves two-way resonance loop using the acoustic characteristic of node antinode while the problem of the interfering with each other that work.The present invention uses two-way high-order acoustic resonance principle, solves conventional acoustic velocity-measuring system and the problem of measurement accuracy deficiency, is conducive to lifting small-bore pipeline flow velocity measurement accuracy in small-bore, low flow velocity pipeline.
Description
Technical field
The present invention relates to a kind of apparatus and method for measuring pipeline rate of flow of fluid, more particularly to one kind are humorous using higher acoustic
Principle of shaking measures small-bore pipeline fluid speed measurement apparatus and method, belongs to flow measurement technology field.
Background technology
Small-bore pipeline in commercial Application for caliber scope between 12mm~50mm, is limited by caliber, sound
Very high requirement can not be reached by learning the measurement accuracy of flowmeter.Famous both acoustic flowmeters production company domestic and international at present is main all
It is the application scenario measured for gas flow, applicable caliber is all larger, therefore is substantially not present on the market for tubule at present
Footpath, the quality product of low flow velocity pipeline flow measurement.
The essence of acoustic measurement pipeline fluid flow velocity is to measure rate of flow of fluid to the modulating action of acoustical signal, works as pipe diameter
When smaller, flow velocity is relatively low, flow velocity is very faint to the modulating action of sound wave, wants accurate measurement very difficult.When in the duct
When constructing acoustic resonance loop, rate of flow of fluid is reflected in the skew of resonant frequency, by choosing higher order resonance frequencies, not
On the basis of measurement by magnification error, amplify the frequency shift (FS) caused by flow velocity, reduction measurement difficulty improves measurement accuracy.Utilize
Standing wave tube acoustic characteristic ensures that two-way resonance loop works simultaneously, is made the difference, can effectively eliminated by just reverse resonant frequency
Influence and systematic error of the temperature to the velocity of sound.Existing many scholar's research are directed to the ultrasonic flowmeter of large diameter pipeline at present,
But do not show and researched and proposed the two-way acoustic resonance measuring principle of high-order, it is moreover, real using standing wave tube acoustic characteristic
Now the correlative study of positive reverse synchronous work, which also has no, has been reported that.
The content of the invention
The technical problems to be solved by the invention are that solve conventional acoustic flowmeter surveys in small-bore, low flow velocity pipeline
There is provided a kind of device and measurement that pipeline rate of flow of fluid is measured using two-way higher acoustic resonance principle for the problem of accuracy of measurement is not enough
Method.
To achieve the above object, the present invention uses following technical scheme：
A kind of device that pipeline rate of flow of fluid is measured using two-way higher acoustic resonance principle, including acoustic resonance part,
Electricity resonance portion, transducer and digital microphone, continuous double frequency two-direction sine resonance is realized in this four parts jointly；Its feature
It is, the acoustic resonance part includes slender pipeline and positive standing wave tube installed in the slender pipeline two ends and reverse
Standing wave tube；The slender pipeline passes through the positive standing wave tube from the first positive frequencies antinodal point, from the first reverse frequency antinode
Put through reverse standing wave tube；
The transducer includes positive transducer and reverse transducer, and the digital microphone includes positive digital microphone
With reverse digital microphone；
One end of the positive standing wave tube is installed by positive transducer, and the Acoustic Wave Propagation side produced in the positive standing wave tube
To consistent with fluid flow direction in slender pipeline；Reverse digital microphone is also installed on the positive standing wave tube, it is described reverse
Digital microphone is located at the coincidence point of positive frequencies nodal point and the second reverse frequency antinodal point；One end of the reverse standing wave tube
The Acoustic Wave Propagation direction produced in reverse transducer, and the reverse standing wave tube is installed opposite with described fluid flow direction；
The reverse standing wave tube also installs positive digital microphone, and the positive digital microphone is located at reverse frequency nodal point and second
The coincidence point of positive frequencies antinodal point.
Further, the electricity resonance portion includes front end amplification module, filtering modeling module, automatic growth control mould
Block and push-pull type power amplifier module, the output signal of the digital microphone are connected to the front end amplification module, described to push away
The output of pull power amplifier module directly drives the transducer.
Further, on the slender pipeline and the positive standing wave tube, the side wall of the reverse standing wave tube intersection location
Eight strip sulculuses are equably opened up, facilitate sound wave to pass in and out the slender pipeline.And reduce as far as possible to standing wave tube standing internal wave
The influence of distribution.
Present invention additionally comprises a kind of method that use aforementioned means measure pipeline rate of flow of fluid.
The higher order resonance frequencies that this method is produced by electricity resonance portion to acoustic resonance part are screened so that
It is forward and inverse that continuous sinusoidal resonance is carried out with the resonant frequencies of different orders to resonant tank, using different frequency node in standing wave tube,
Anti-node location different acoustic characteristic suppresses the sound wave that this pipe sound source is sent so that digital microphone is received from distant place
Weak signal, reduction by two resonant tanks are interfered with each other, so that realize that two way circuit works simultaneously, it is forward and inverse to humorous by measuring
Vibration frequency is poor, eliminates influence of the temperature to measurement result, change in flow is calculated in real time.
Those skilled in the art know, in the electricity resonance portion in the propagation time of electric signal and acoustic resonance part
The propagation time of acoustical signal, compared to very short, can be ignored, acoustic resonance loop can be equivalent to ring resonator, resonance
Fundamental frequency is the inverse of ultrasonic transmission time, when the gain of whole resonant tank and phase meet condition, resonator can realize from
Also there are many higher order resonance frequencies in Induced Oscillation, resonator, flow velocity changes the equivalent length of ring resonator, that is, changes humorous
Vibration frequency, the frequency shift (FS) that higher order resonance frequencies cause flow velocity is amplified, by the mathematic interpolation stream for measuring two-way resonance frequency
Rate of flow of fluid.The reverse sound wave that positive numeral microphone can not sent when positive sound wave is received by nearby reverse transducer
Influence, reverse numeral microphone can be when reverse sound wave be received not by the positive sound wave shadow that nearby positive transducer is sent
Ring.
Further, sinusoidal acoustical signal is converted to sinusoidal electric signals by the digital microphone, by front end amplification module
Processing enters filtering modeling module, selects different higher order resonance frequencies, and automatic growth control module causes sinusoidal electric signals to have
There is stable amplitude, the sinusoidal electric signals after conditioning are changed into the adjustable square-wave signal of dutycycle by comparison circuit, controlled with this
Push-pull type power amplifier module exports the high-voltage signal driving transducer of similar sine wave, converts electrical signals to acoustical signal.
Further, the sound wave that positive transducer is produced can form stable standing wave in positive standing wave tube, and first
Positive magnitudes of acoustic waves at positive frequencies antinodal point is maximum, and positive sound wave propagates to reverse standing wave tube by slender pipeline, and
Stable standing wave is formed in reverse standing wave tube；
The sound wave that reverse transducer is produced can form stable standing wave in reverse standing wave tube, and in the first reverse frequency antinode
Reverse magnitudes of acoustic waves at point is maximum, and reverse sound wave propagates to positive standing wave tube by slender pipeline, and in positive standing wave tube
Form stable standing wave；Amplitude maximum of the positive sound wave at positive digital microphone, amplitude is approximately zero to reverse sound wave here；
Amplitude maximum of the reverse sound wave at reverse digital microphone, amplitude is approximately zero to positive sound wave here.
Two-way higher acoustic resonance velocimetry proposed by the present invention is formed in acoustic resonance part and electricity resonance portion
Continuous and complete sinusoidal resonance, can reflect the change of rate of flow of fluid by the real-time change of resonant frequency.High-order is humorous
Vibration frequency is chosen so that velocity-measuring system is more sensitive for microflow rate, is favorably improved small-bore, low flow velocity pipeline system
Rate of flow of fluid measurement accuracy in system.Standing wave tube acoustic characteristic realizes the synchronous working in two-way resonance loop, eliminates traditional sound
The error that two loop alternations are introduced in speed-measuring method is learned, also enables two loops completely continuously to work.It is two-way
Loop synchronisation works, and can eliminate influence of the temperature for measurement result precision by measurement frequency difference, suppress measurement result
Temperature drift, further improves measurement accuracy.
Brief description of the drawings
Fig. 1 is that two-way higher acoustic the resonance method measures device structure schematic diagram；
Fig. 2 is that higher acoustic the resonance method measures principle schematic；
In figure：Acoustic resonance part 1, electricity resonance portion 2, front end amplification module 5, filtering modeling module 6, automatic gain
Control module 7, push-pull type power amplifier module 8, slender pipeline 11, positive transducer 121, reverse transducer 122, first are positive
Frequency antinodal point 123, the first reverse frequency antinodal point 124, reverse digital microphone 125, positive digital microphone 126, forward direction
Standing wave tube 127, reverse standing wave tube 128, positive frequencies nodal point 129, the second reverse frequency antinodal point 130, reverse frequency node
The 131, second positive frequencies antinodal point 132 of point, fluid flow direction 133.
Embodiment
More see clear for the purpose, technical scheme and advantage that make the embodiment of the present invention, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described.Obviously, the embodiment is this hair
Bright a part of embodiment, rather than whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art are not having
The other embodiment obtained under the premise of creative work is made, protection scope of the present invention is belonged to.
As shown in figure 1, a kind of device that pipeline rate of flow of fluid is measured using two-way higher acoustic resonance principle, including acoustics
Resonance portion 1, electricity resonance portion 2, transducer and digital microphone, it is characterised in that realize jointly continuous in this four parts
Double frequency two-direction sine resonance；
The acoustic resonance part 1 includes slender pipeline 11 and the positive standing wave installed in the two ends of slender pipeline 11
Pipe 127 and reverse standing wave tube 128；The slender pipeline 11 passes through the positive standing wave tube from the first positive frequencies antinodal point 123
127, pass through reverse standing wave tube 128 from the first reverse frequency antinodal point 124；
The transducer includes positive transducer 121 and reverse transducer 122, and the digital microphone includes positive numeral
Microphone 126 and reverse digital microphone 125；
The positive transducer 121 is installed in one end of the positive standing wave tube 127, and is produced in the positive standing wave tube 127
Raw Acoustic Wave Propagation direction is consistent with fluid flow direction 133 in the slender pipeline 11；Also pacify on the positive standing wave tube 127
The reverse digital microphone 125 is filled, it is reverse that the reverse digital microphone 125 is located at positive frequencies nodal point 129 and second
The coincidence point of frequency antinodal point 130；The reverse transducer 122 is installed in one end of the reverse standing wave tube 128, and described reverse
The Acoustic Wave Propagation direction produced in standing wave tube 128 is opposite with described fluid flow direction 133；In the reverse standing wave tube 128
The positive digital microphone 126 is also installed, the positive digital microphone 126 is located at reverse frequency nodal point 131 and second
The coincidence point of positive frequencies antinodal point 132.
The electricity resonance portion 2 includes front end amplification module 5, filtering modeling module 6, the and of automatic growth control module 7
Push-pull type power amplifier module 8, the output signal of the digital microphone is connected to the front end amplification module 5, described to recommend
The output of formula power amplifier module 8 directly drives the transducer.
On the slender pipeline 11 and the positive standing wave tube 127, the side wall of the reverse intersection location of standing wave tube 128
Eight strip sulculuses are opened up evenly, facilitate sound wave to pass in and out the slender pipeline 11, and reduce as far as possible to standing wave tube standing internal wave
The influence of distribution.
Present invention additionally comprises a kind of method that use aforementioned means measure pipeline rate of flow of fluid.
The higher order resonance frequencies that this method is produced by electricity resonance portion 2 to acoustic resonance part 1 are screened so that
It is forward and inverse that continuous sinusoidal resonance is carried out with the resonant frequency of different orders to resonant tank, utilize different frequencies in standing wave tube 127,128
The different acoustic characteristic of rate node, anti-node location suppresses the sound wave that this pipe sound source is sent so that digital microphone 126,125 connects
The weak signal from distant place is received, interfering with each other for two resonant tanks of reduction, so as to realize that two way circuit works simultaneously, passes through
Measurement is forward and inverse poor to resonant frequency, eliminates influence of the temperature to measurement result, change in flow is calculated in real time.
Those skilled in the art know, in the electricity resonance portion in the propagation time of electric signal and acoustic resonance part
The propagation time of acoustical signal, compared to very short, can be ignored, acoustic resonance loop can be equivalent to ring resonator, resonance
Fundamental frequency is the inverse of ultrasonic transmission time, when the gain of whole resonant tank and phase meet condition, resonator can realize from
Also there are many higher order resonance frequencies in Induced Oscillation, resonator, flow velocity changes the equivalent length of ring resonator, that is, changes humorous
Vibration frequency, the frequency shift (FS) that higher order resonance frequencies cause flow velocity is amplified, by the mathematic interpolation stream for measuring two-way resonance frequency
Rate of flow of fluid.The reverse sound wave that positive numeral microphone can not sent when positive sound wave is received by nearby reverse transducer
Influence, reverse numeral microphone can be when reverse sound wave be received not by the positive sound wave shadow that nearby positive transducer is sent
Ring.
Sinusoidal acoustical signal is converted to sinusoidal electric signals by the digital microphone 126,125, and mould is amplified by the front end
The processing of block 5 enters the filtering modeling module 6, selects different higher order resonance frequencies, and the automatic growth control module 7 causes
Sinusoidal electric signals have stable amplitude, and the sinusoidal electric signals after conditioning are changed into the adjustable square wave of dutycycle by comparison circuit and believed
Number, transducer 121,122 is driven with the high-voltage signal that this controls the push-pull type power amplifier module 8 to export similar sine wave,
Convert electrical signals to acoustical signal.
The sound wave that the positive transducer 121 is produced can form stable standing wave in the positive standing wave tube 127, and in institute
The positive magnitudes of acoustic waves stated at the first positive frequencies antinodal point 123 is maximum, and the positive sound wave is passed by the slender pipeline 11
Cast to the reverse standing wave tube 128, and the stable standing wave of formation in the reverse standing wave tube 128；
The sound wave that the reverse transducer 122 is produced can form stable standing wave in the reverse standing wave tube 128, and in institute
The reverse magnitudes of acoustic waves stated at the first reverse frequency antinodal point 124 is maximum, and the reverse sound wave is passed by the slender pipeline 11
Cast to the positive standing wave tube 127, and the stable standing wave of formation in the positive standing wave tube 127；
Amplitude maximum of the positive sound wave at the positive digital microphone 126, reverse sound wave width here
Value is approximately zero；Amplitude maximum of the reverse sound wave at the reverse digital microphone 125, the positive sound wave is here
Amplitude is approximately zero.
Those skilled in the art can hold very much according to word description provided by the present invention, accompanying drawing and claims
Easily in the case where not departing from thought of the invention and range of condition that claims are limited, a variety of changes and change can be made.
Every technological thought and the substantive any modification carried out to above-described embodiment, equivalent variations according to the present invention, belongs to this hair
Within the protection domain that bright claim is limited.
Claims (6)
1. a kind of device that pipeline rate of flow of fluid is measured using two-way higher acoustic resonance principle, including acoustic resonance part (1),
Electricity resonance portion (2), transducer and digital microphone, continuous double frequency two-direction sine resonance is realized in this four parts jointly.Its
It is characterised by：
The acoustic resonance part (1) includes slender pipeline (11) and the forward direction installed in the slender pipeline (11) two ends is stayed
Wave duct (127) and reverse standing wave tube (128) etc.；The slender pipeline (11) passes through institute from the first positive frequencies antinodal point (123)
Positive standing wave tube (127) is stated, reverse standing wave tube (128) is passed through from the first reverse frequency antinodal point (124)；
The transducer includes positive transducer (121) and reverse transducer (122), and the digital microphone includes positive numeral
Microphone (126) and reverse digital microphone (125)；
The positive transducer (121) is installed in one end of the positive standing wave tube (127), and in the positive standing wave tube (127)
The Acoustic Wave Propagation direction of generation is consistent with fluid flow direction (133) in the slender pipeline (11)；
The reverse digital microphone (125), the reverse digital microphone are also installed on the positive standing wave tube (127)
(125) it is located at the coincidence point of positive frequencies nodal point (129) and the second reverse frequency antinodal point (130)；
The reverse transducer (122) is installed in one end of the reverse standing wave tube (128), and in the reverse standing wave tube (128)
The Acoustic Wave Propagation direction of generation is opposite with described fluid flow direction (133)；
The reverse standing wave tube (128) also installs the positive digital microphone (126), the positive digital microphone (126)
Positioned at reverse frequency nodal point (131) and the coincidence point of the second positive frequencies antinodal point (132).
2. device according to claim 1, wherein, the electricity resonance portion (2) includes front end amplification module (5), filter
Ripple modeling module (6), automatic growth control module (7) and push-pull type power amplifier module (8), the output of the digital microphone
Signal is connected to the front end amplification module (5), and the output of the push-pull type power amplifier module (8) directly drives the transducing
Device.
3. device according to claim 2, it is characterised in that：The slender pipeline (11) and the positive standing wave tube
(127) eight strip sulculuses equably, are opened up on the side wall of reverse standing wave tube (128) intersection location, facilitate sound wave to enter
Go out the slender pipeline (11).
4. a kind of method that use Claims 2 or 3 described device measures pipeline rate of flow of fluid, it is characterised in that pass through electricity
The higher order resonance frequencies that resonance portion (2) is produced to acoustic resonance part (1) are screened so that it is forward and inverse to resonant tank with
The resonant frequency of different orders carries out continuous sinusoidal resonance, utilizes the standing wave tube (127,128) interior different frequency node, antinode
The different acoustic characteristic in position suppresses the sound wave that this pipe sound source is sent so that digital microphone (126,125) receives comes from
The weak signal of distant place, two resonant tanks of reduction are interfered with each other, so as to realize that two way circuit works simultaneously, by measure just,
Reverse resonant frequency is poor, eliminates influence of the temperature to measurement result, change in flow is calculated in real time.
5. method according to claim 4, it is characterised in that：Sinusoidal acoustical signal is converted to sine by the digital microphone
Electric signal, enters the filtering modeling module (6) by front end amplification module (5) processing, selects different higher order resonances
Frequency, the automatic growth control module (7) causes sinusoidal electric signals to have stable amplitude, the sinusoidal electric signals warp after conditioning
Cross comparison circuit and be changed into the adjustable square-wave signal of dutycycle, control push-pull type power amplifier module (8) output similar with this
The high-voltage signal of sine wave drives the transducer (121,122), converts electrical signals to acoustical signal.
6. method according to claim 5, it is characterised in that the sound wave that the positive transducer (121) produces can be in institute
State and stable standing wave is formed in positive standing wave tube (127), and in the positive sound wave width at the first positive frequencies antinodal point (123) place
Value is maximum, and the positive sound wave propagates to the reverse standing wave tube (128) by the slender pipeline (11), and described reverse
Stable standing wave is formed in standing wave tube (128)；
The sound wave that the reverse transducer (122) produces can form stable standing wave in the reverse standing wave tube (128), and in institute
The reverse magnitudes of acoustic waves for stating the first reverse frequency antinodal point (124) place is maximum, and the reverse sound wave passes through the slender pipeline
(11) the positive standing wave tube (127), and the stable standing wave of formation in the positive standing wave tube (127) are propagated to；
The positive sound wave is in the amplitude maximum at described positive digital microphone (126) place, reverse sound wave amplitude here
It is approximately zero；
The reverse sound wave is in the amplitude maximum at reverse digital microphone (125) place, positive sound wave amplitude here
It is approximately zero.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710427397.6A CN107271715B (en) | 2017-06-08 | 2017-06-08 | A kind of device and measurement method measuring pipeline fluid flow rate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710427397.6A CN107271715B (en) | 2017-06-08 | 2017-06-08 | A kind of device and measurement method measuring pipeline fluid flow rate |
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| CN107271715A true CN107271715A (en) | 2017-10-20 |
| CN107271715B CN107271715B (en) | 2019-08-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116124229A (en) * | 2023-04-17 | 2023-05-16 | 丹氏生物科技成都有限公司 | Method for detecting pipeline flow of liquid nitrogen tank by adopting passive resonant cavity |
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