CN202956153U - Ultrasonic gas flow meter through time difference method - Google Patents
Ultrasonic gas flow meter through time difference method Download PDFInfo
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- CN202956153U CN202956153U CN 201220513931 CN201220513931U CN202956153U CN 202956153 U CN202956153 U CN 202956153U CN 201220513931 CN201220513931 CN 201220513931 CN 201220513931 U CN201220513931 U CN 201220513931U CN 202956153 U CN202956153 U CN 202956153U
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Abstract
The utility model discloses an ultrasonic gas flow meter through a time difference method. The ultrasonic gas flow meter comprises a measuring tube, an ultrasonic transducer group for measuring downstream time during downstream spread and countercurrent time during countercurrent spread of ultrasonic waves in gas to be measured is arranged at the section of the measuring tube, two static speed tubes which are communicated with the section of the ultrasonic transducer group on the measuring tube and used for facilitating free diffusion of the gas to be measured in the section is fixedly connected onto the measuring tube, the two static speed tubes are provided with ultrasonic transducers for measuring propagation speeds of the ultrasonic waves in the static speed tubes respectively, the two static speed tubes are provided with measuring sonic paths arranged corresponding to the ultrasonic transducers in the static speed tubes respectively, and the lengths of the two measuring sonic paths on the static speed tubes differ by one time. By means of the flow meter, online detection of the propagation speeds of the ultrasonic waves is achieved, the gas in the static speed tubes and the gas to be measured in the measuring tube are always under the same state, the measuring accuracy is improved, and the flow meter is applicable to measurement of gas flow under various environments.
Description
Technical field
The utility model belongs to the gas flow measurement technical field, is specifically related to a kind of ultrasonic gas flowmeter based on time difference.
Background technology
The measuring ultrasonic wave flow technology be a kind of when utilizing ultrasonic signal in fluid, to propagate the flow rate information of fluid measure the measuring technique of fluid flow, it has the characteristics such as non-contact measurement, measuring accuracy is high, measurement range is wide, convenient for installation and maintenance.According to the principle to input, the Time-difference Ultrasonic Flow pick-up unit is broadly divided into the types such as time difference method, frequency-difference method, wave beam deflection method, Doppler method, wherein most widely used flow detector based on time difference method at present.
In fact, because ultrasonic signal is compared with static medium in fluid media (medium), the velocity of propagation of ultrasonic signal increases during following current, travel-time reduces, the velocity of propagation of ultrasonic signal reduces during adverse current, travel-time increases, thereby so that the travel-time life period of concurrent-countercurrent direction ultrasonic signal is poor.And transit time ultrasonic flow meters exists the linear dependence principle to measure according to flow velocity and mistiming of fluid media (medium), therefore as long as Accurate Determining following current time and adverse current time, flow velocity and the linear dependence of following current time and adverse current time according to fluid media (medium), can obtain the flow velocity of fluid media (medium), and then obtain the flow of gas to be measured.As being to disclose a kind of transit time ultrasonic flow meters in the Chinese utility model patent application of CN101886939A at application publication number, this ultrasonic flow meter comprises measuring tube, on the pipeline section of measuring tube along measuring tube axially and be the correlation structure fabric and be equipped with two transceivers and mutually alternately corresponding as radiated element with receive two ultrasonic transducers of original paper, the note mistiming is Δ t, Δ t=t
2-t
1, t wherein
2Be adverse current time, t
1Be the following current time, wherein,
Then obtain following equation:
Δt=t
2-t
1 （2）
v′=vf(θ) （3）
Wherein, τ represents the time delay of ultrasonic signal in ultrasonic transducer and circuit, t
2-t
1Can eliminate the impact of τ, S is according to the measured propagation sound path that obtains of the layout of ultrasonic transducer group in the device for detecting ultrasonic wave flow, C
fBe the velocity of propagation of ultrasound wave in fluid media (medium), θ is the sound channel angle, and v is the flow velocity of fluid media (medium), and v ' then is the component velocity of flow velocity on the ultrasonic propagation direction of fluid media (medium), and f (θ) is trigonometric function.For aforesaid equation (1) and (2), the flow velocity v of fluid media (medium) and Δ t, S, C
f, and f (θ) relevant, wherein S and f (θ) just can directly measure in the certain situation of structure of ultrasonic flowmeter, only need to measure calculating Δ t and C
fGet final product, and Δ t can pass through t
2-t
1Measurement calculates, and only has C
fNeeding compensation to calculate just can obtain.
Ultrasonic transducer on the measuring tube of the device for detecting ultrasonic wave flow that adopts in the above-mentioned patent documents of quoting is the correlation structural arrangement, and when actual measurement, the all right V-shaped reflection configuration of ultrasonic transducer on the measuring tube or other structural arrangement, and calculate following current time and adverse current during the time, at formula when adopting other arrangement forms
And
In that change is exactly the component velocity v ' of flow velocity on the ultrasonic propagation direction of sound path S and fluid media (medium), and sound path S and f (θ) all can directly measure according to concrete arrangement form.So no matter adopt which kind of arrangement form, finally also need to determine the velocity of propagation C of ultrasound wave in fluid media (medium)
f
And the velocity of propagation C of ultrasound wave in fluid media (medium)
fUltrasonic velocity is subject to the impact of various environmental factors, comprises gas composition to be measured, temperature, pressure etc., and in common environmental factor, temperature is the most serious on the impact of ultrasonic velocity, and pressure also has important impact to ultrasonic velocity.So must carry out various compensation calculates just can draw and calculates the velocity of propagation C of ultrasound wave in fluid media (medium)
f, such as, in air, temperature can be according to formula c on the impact of ultrasonic velocity
Air=331.45+0.61t(t Celsius temperature) calculate, and pressure can be according to formula on the impact of the velocity of sound
(v is the speed of sound wave in gas to be measured, and k is gas coefficient of heat insulation to be measured, and p is gas pressure intensity to be measured, and ρ is gas density to be measured) weighed.And gas composition to be measured is to the velocity of propagation C of ultrasound wave in fluid media (medium)
fImpact only also can't realize by ultrasonic flow device self at present, can only solve and pipeline gas composition to be measured changes by on-site proving, the ultrasonic flow device is realized that Measurement accuracy has brought very large difficulty.
The utility model content
The purpose of this utility model is to provide a kind of ultrasonic gas flowmeter based on time difference, need to compensate calculating for various environmental factors and just can draw real ultrasound wave velocity of propagation and affect the technical matters of measuring accuracy in fluid media (medium) to solve in the prior art.
For achieving the above object, ultrasonic gas flowmeter based on time difference provided by the utility model adopts following technical scheme: ultrasonic gas flowmeter based on time difference, comprise measuring tube, be furnished with for measuring the following current time of ultrasound wave when gas following current to be measured is propagated and the ultrasonic transducer group of the adverse current time of adverse current when propagating at the pipeline section of measuring tube, being fixed with two on the described measuring tube is connected with pipeline section that measuring tube is provided with the ultrasonic transducer group, and the quiet speed pipe for the gas free diffusing to be measured in this pipeline section, arrange respectively the ultrasonic transducer that is used for measuring at quiet fast pipe ultrasonic propagation velocity on two quiet fast pipes, have respectively in the two quiet fast pipes by the ultrasonic transducer in the quiet fast pipe of correspondence and arrange the measurement sound path of determining, the length that two on the described two quiet fast pipes are measured sound path differs 1 times.
One of them quiet fast pipe in described two quiet fast pipes by the first anemostat be connected with measuring tube, another quiet fast pipe is connected with measuring tube by the second anemostat.
Ultrasonic transducer group on the described measuring tube comprises two transceivers and alternately correspondence is as the ultrasonic transducer that transmits and receives element, and two ultrasonic transducers that are the transceiver structure on the described measuring tube are the correlation structure or the V-shaped reflection configuration that intersect with the measuring tube axioversion and are disposed axially on the pipeline section of measuring tube along measuring tube.
Ultrasonic transducer on described two quiet speed pipes or one of them quiet fast pipe adopts following arrangement: the ultrasonic transducer on the quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and one of them in two ultrasonic transducers on the described quiet fast pipe is radiated element, another is receiving element.
Ultrasonic transducer on described two quiet fast pipes or one of them quiet fast pipe adopts following arrangement: the ultrasonic transducer on the quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and two ultrasonic transducers on the described quiet fast pipe are transceiver structure and mutual alternately as transmitting and receiving element.
Ultrasonic transducer on described two quiet speed pipes or one of them quiet fast pipe adopts following arrangement: the ultrasonic transducer on the quiet fast pipe is the transceiver structure, the ultrasonic transducer that is the transceiver structure on the described quiet fast pipe is arranged in the axial end of quiet speed pipe, is furnished with hyperacoustic reflecting part of launching from ultrasonic transducer for reflection at the axial other end of quiet speed pipe.
The beneficial effects of the utility model are: transit time ultrasonic flow meters provided by the utility model, two quiet speed pipes be communicated with the gas free diffusing to be measured that supplies in this pipeline section on the measuring tube in the pipeline section that is provided with the ultrasonic transducer group are furnished with for the ultrasonic transducer of measuring ultrasonic propagation velocity at each quiet fast Guan Zhongjun.During use, measure following current time and the adverse current time of ultrasound wave following current when propagating by being arranged in ultrasonic transducer group on the measuring tube, and measurement calculates the velocity of propagation of ultrasound wave in the gas to be measured of quiet fast pipe in quiet fast pipe, then bring following current time, adverse current time and ultrasonic propagation velocity into calculate gas to be measured in the respective party formula flow velocity, and then obtain gas flow to be measured.In the pick-up unit provided by the utility model, be provided with quiet speed pipe at measuring tube, during measurement, gas free diffusing to be measured in the measuring tube is in quiet fast pipe, the quiet speed residing environmental factor of pipe such as gas composition, temperature, the factors such as pressure are consistent with environmental factor in the measuring tube, the measured ultrasonic propagation velocity that calculates is the velocity of propagation in the gas of ultrasound wave at measuring tube in quiet fast pipe, eliminate gas composition by directly measuring the velocity of propagation of ultrasound wave in gas to be measured at quiet speed pipe like this, temperature, the impact of the factors such as pressure, realize self-compensating function, save the various compensation that need in the prior art to consider various environmental factors and do and calculate.Simultaneously, two quiet speed pipes are worked simultaneously when measuring, and the ultrasonic transducer on the two quiet fast pipes is corresponding measures hyperacoustic velocity of propagation C in the quiet fast pipe separately
F1And C
F2, then utilize the ultrasonic propagation velocity C that in two quiet fast pipes, records
F1And C
F2Carry out related operation, obtain final accurate higher ultrasonic propagation velocity C
fStructure of the detecting device provided by the utility model is realized the online detection to ultrasonic propagation velocity, guarantee that gas and the gas to be measured in the measuring tube in the quiet fast pipe are under the same state all the time, improve the accuracy of measuring, the measurement of being convenient to use the gas flow under the various environment.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of ultrasonic gas flowmeter based on time difference provided by the utility model.
Embodiment
As shown in Figure 1, a kind of embodiment of ultrasonic gas flowmeter based on time difference, gas meter among this embodiment comprises puts the measuring tube 2 that comprises that confession gas flow to be measured is crossed, be furnished with for measuring the following current time of ultrasound wave when gas following current to be measured is propagated and the ultrasonic transducer group of the adverse current time of adverse current when propagating at the pipeline section of measuring tube 2, this ultrasonic transducer group comprises two transceivers, and alternately corresponding conduct transmits and receives the ultrasonic transducer 1 of element, and the V-shaped reflection configuration of the ultrasonic transducer of two transceivers is along on the axial arranged measuring tube of measuring tube herein.Being fixed with two on the described measuring tube 2 is connected with pipeline section that measuring tube is provided with the ultrasonic transducer group, and the quiet speed pipe for the gas free diffusing to be measured in this pipeline section, two quiet fast pipes are first quiet speed pipe the 3 and second quiet speed pipe 6, wherein, the first quiet speed pipe 3 is connected on the measuring tube by the first anemostat 5, and the first quiet fast pipe is connected with measuring tube by the first anemostat, and the second quiet speed pipe 6 is connected on the measuring tube by the second anemostat 8, and the second quiet fast pipe is connected with measuring tube by the second anemostat, the first anemostat herein and the second anemostat axially are furnished with two along quiet speed pipe respectively, and apart more closely to prevent gas pulsation occurring in the quiet fast pipe.Be furnished with in the quiet fast pipe of correspondence emission and receive ultrasound wave to be used for measuring the first ultrasonic transducer 4 of ultrasonic propagation velocity at the first quiet speed pipe 3.And be furnished with in the quiet fast pipe of correspondence emission and receive ultrasound wave to be used for measuring the second ultrasonic transducer 7 of ultrasonic propagation velocity at the second quiet speed pipe 6, ultrasonic transducer in two quiet fast pipes herein adopts identical arrangement: the ultrasonic transducer on the quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and one of them in two ultrasonic transducers on the described quiet fast pipe is radiated element, another is receiving element.Arrange the first measurement sound path of determining at the first ultrasonic transducer 4 that the first quiet speed pipe 3 has by this in quiet fast pipe, manage 6 the second ultrasonic transducers 7 that have by this in quiet fast pipe in the second quiet speed and arrange the second measurement sound path of determining, the first length of measuring sound path and the second measurement sound path herein differs one times.
Measurement sound path in above-described embodiment refers to that ultrasound wave is sent by the ultrasonic transducer as radiated element, then by receive as the ultrasonic transducer of receiving element the distance of process.Measure sound path and determine that by the layout of the ultrasonic transducer in the quiet fast pipe ultrasonic transducer is being installed in quiet fast Guan Shanghou, the measurement sound path in this quiet fast pipe is determined value.
During measurement, behind the quiet speed pipe 3,6 of the gas free diffusing to two to be measured in the buret to be measured, the ultrasonic transducer in the two quiet fast pipes is started working, and then measurement calculates the ultrasonic propagation velocity C of two ultrasound waves in gas to be measured in two quiet fast pipes
F1And C
F2, to the measured ultrasonic propagation velocity C that calculates
F1With bring in the lower computing formula:
Can obtain the ultrasonic propagation velocity C of ultrasound wave in gas to be measured
f, and then with C
fIn the corresponding calculation equation of substitution, can obtain the flow velocity of gas to be measured to be measured, and then record the flow of gas to be measured in measuring tube.
In above-described embodiment, two ultrasonic transducers in the ultrasonic transducer group in the measuring tube are 45 ° of V-types to be arranged, in other embodiments, the V-type that also can be other angles is arranged.
In above-described embodiment, the V-shaped reflection configuration of two ultrasonic transducers in the ultrasonic transducer group in the measuring tube is arranged, in other embodiments, also can adopt the arrangement form that is the correlation structure that intersects with the measuring tube axioversion of the prior art, can not affect its measurement result.
In above-described embodiment, the V-shaped reflection configuration of two ultrasonic transducers in the ultrasonic transducer group in the measuring tube is arranged, in other embodiments, also can adopt the arrangement form that is four ultrasonic transducers of X-type two-channel layout of the prior art.Four ultrasonic transducers that are the X-type layout on the measuring tube are the transceiver structure, because four ultrasonic transducers form two and measure sound channel, like this for each sound channel, as long as a radiated element and a receiving element are arranged, certainly, four ultrasonic transducers can be separately radiated element or receiving element also, only otherwise following current time and the adverse current time of impact when measuring ultrasound wave and in the fluid of measuring tube, propagating get final product.
In above-described embodiment, the V-shaped reflection configuration of two ultrasonic transducers in the ultrasonic transducer group in the measuring tube is arranged, in other embodiments, can also be on measuring tube be that the ultrasonic reflections position is furnished with the ultrasonic sensor as receiving element in the ultrasonic transducer of two V-shaped layouts over against side center position place, this form at three ultrasonic transducers of measuring tube layout can be eliminated whole ultrasonic detection device and install the time delay of bringing because of self, can farthest improve following current time and adverse current measurement of time precision.
In above-described embodiment, the arrangement of the ultrasonic transducer on the quiet fast pipe can also be furnished with two at the axial two ends of quiet speed pipe for: the ultrasonic transducer on the described quiet fast pipe, and two ultrasonic transducers on the described quiet fast pipe are transceiver structure and mutually alternately corresponding to transmitting and receiving element.
Perhaps adopt following arrangement: the ultrasonic transducer on the described quiet fast pipe is the transceiver structure, the ultrasonic transducer that is the transceiver structure on the described quiet fast pipe is arranged in the axial end of quiet speed pipe, is furnished with hyperacoustic reflecting part of launching from ultrasonic transducer for reflection at the axial other end of quiet speed pipe.
In the above-mentioned arrangement of enumerating, ultrasonic transducer on the quiet fast pipe all adopts the correlation structure, in other embodiments, ultrasonic transducer on the quiet fast pipe can also adopt V-type reflection configuration layout or other layouts, as long as can measure sound path and the travel-time of ultrasound wave in quiet fast pipe.
Direct measurement when ultrasonic gas flowmeter provided by the utility model has realized that ultrasound wave is propagated in tested gas has guaranteed the accuracy of the measured velocity of sound by quiet fast pipe, and whole device is simple and reliable.
Claims (6)
1. ultrasonic gas flowmeter based on time difference, comprise measuring tube, be furnished with for measuring the following current time of ultrasound wave when gas following current to be measured is propagated and the ultrasonic transducer group of the adverse current time of adverse current when propagating at the pipeline section of measuring tube, it is characterized in that, being fixed with two on the described measuring tube is connected with pipeline section that measuring tube is provided with the ultrasonic transducer group, and the quiet speed pipe for the gas free diffusing to be measured in this pipeline section, arrange respectively the ultrasonic transducer that is used for measuring at quiet fast pipe ultrasonic propagation velocity on two quiet fast pipes, have respectively in the two quiet fast pipes by the ultrasonic transducer in the quiet fast pipe of correspondence and arrange the measurement sound path of determining, the length that two on the described two quiet fast pipes are measured sound path differs 1 times.
2. ultrasonic gas flowmeter based on time difference according to claim 1, it is characterized in that, one of them the quiet fast pipe in described two quiet fast pipes by the first anemostat be connected with measuring tube, another quiet fast pipe is connected with measuring tube by the second anemostat.
3. ultrasonic gas flowmeter based on time difference according to claim 1, it is characterized in that, ultrasonic transducer group on the described measuring tube comprises two transceivers and alternately correspondence is as the ultrasonic transducer that transmits and receives element, and two ultrasonic transducers that are the transceiver structure on the described measuring tube are the correlation structure or the V-shaped reflection configuration that intersect with the measuring tube axioversion and are disposed axially on the pipeline section of measuring tube along measuring tube.
4. according to claim 1 and 2 or 3 described ultrasonic gas flowmeter based on time difference, it is characterized in that, ultrasonic transducer on described two quiet speed pipes or one of them quiet fast pipe adopts following arrangement: the ultrasonic transducer on the quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and one of them in two ultrasonic transducers on the described quiet fast pipe is radiated element, another is receiving element.
5. according to claim 1 and 2 or 3 described ultrasonic gas flowmeter based on time difference, it is characterized in that, ultrasonic transducer on described two quiet fast pipes or one of them quiet fast pipe adopts following arrangement: the ultrasonic transducer on the quiet fast pipe is furnished with two at the axial two ends of quiet speed pipe, and two ultrasonic transducers on the described quiet fast pipe are transceiver structure and mutual alternately as transmitting and receiving element.
6. according to claim 1 and 2 or 3 described ultrasonic gas flowmeter based on time difference, it is characterized in that, ultrasonic transducer on described two quiet speed pipes or one of them quiet fast pipe adopts following arrangement: the ultrasonic transducer on the quiet fast pipe is the transceiver structure, the ultrasonic transducer that is the transceiver structure on the described quiet fast pipe is arranged in the axial end of quiet speed pipe, is furnished with hyperacoustic reflecting part of launching from ultrasonic transducer for reflection at the axial other end of quiet speed pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220513931 CN202956153U (en) | 2012-09-29 | 2012-09-29 | Ultrasonic gas flow meter through time difference method |
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|---|---|---|---|
| CN 201220513931 CN202956153U (en) | 2012-09-29 | 2012-09-29 | Ultrasonic gas flow meter through time difference method |
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| CN202956153U true CN202956153U (en) | 2013-05-29 |
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| CN 201220513931 Expired - Lifetime CN202956153U (en) | 2012-09-29 | 2012-09-29 | Ultrasonic gas flow meter through time difference method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103948400A (en) * | 2014-05-20 | 2014-07-30 | 夏云 | Disposable ultrasonic breathing tube |
-
2012
- 2012-09-29 CN CN 201220513931 patent/CN202956153U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103948400A (en) * | 2014-05-20 | 2014-07-30 | 夏云 | Disposable ultrasonic breathing tube |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee after: GLTECH Co.,Ltd. Address before: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee before: ZHEJIANG GUANGLI TECH DEVELOPMENT Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130529 |