CN202734881U - Ultrasonic flow detection device - Google Patents
Ultrasonic flow detection device Download PDFInfo
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- CN202734881U CN202734881U CN201220421689.1U CN201220421689U CN202734881U CN 202734881 U CN202734881 U CN 202734881U CN 201220421689 U CN201220421689 U CN 201220421689U CN 202734881 U CN202734881 U CN 202734881U
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- ultrasonic
- ultrasonic transducer
- pipe
- quiet
- measuring tube
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Abstract
The utility model discloses an ultrasonic flow detection device. The ultrasonic flow detection device comprises a measuring tube, wherein an ultrasonic transducer group for measuring the direct flowing time of the ultrasonic during direct flow propagation in a to-be-measured gas and the reverse flowing time during reverse flow propagation in the to-be-measured gas is distributed on the tube section of the measuring tube; the ultrasonic transducer group comprises two pairs of ultrasonic transducers arranged on the tube section in X-shaped form; the measuring tube is fixedly connected with a static speed container; the static speed container intercommunicates with the tube section on which the ultrasonic transducer group is arranged, and is used for the to-be-measured gas in the tube section to diffuse freely; and the ultrasonic transducer for emitting and receiving the ultrasonic in a static speed tube to measure the propagation speed of the ultrasonic is arranged on the static speed tube. The environment factors for the static speed tube, such as gas constituent, temperature and pressure, are consistent to the environment factors for the measuring tube, and the propagation speed of the ultrasonic is directly measured at the static speed tube, thus, the influence of the factors, such as gas constituent, temperature and pressure, is eliminated.
Description
Technical field
The utility model belongs to the gas flow measurement technical field, is specifically related to a kind of device for detecting ultrasonic wave flow.
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, the characteristics such as it has 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 that the correlation structure fabric is equipped with two transceivers and mutually alternately 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) are in the situation that structure of ultrasonic flowmeter is certain just can directly measure, and 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, ultrasonic transducer on the measuring tube can also V-shaped reflection configuration and along measuring tube axial arranged or other arrangement form, be to be furnished with 4 ultrasonic transducers in the Chinese invention patent application instructions of CN102261937A on the disclosed transit-time ultrasonic flow meter to be X-type and to arrange arrangement forms that form two measurement sound channels etc. such as application publication number, 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 device for detecting ultrasonic wave flow, 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, device for detecting ultrasonic wave flow provided by the utility model adopts following technical scheme: 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, this ultrasonic transducer group comprises that being X-type is arranged in two pairs of ultrasonic transducers on the described pipeline section, be fixed with on the described measuring tube with pipeline section that measuring tube is provided with the ultrasonic transducer group and be connected, and for the quiet fast container of the gas free diffusing to be measured in this pipeline section, be furnished with in the quiet fast pipe emission and receive ultrasound wave to be used for measuring the ultrasonic transducer of ultrasonic propagation velocity at quiet fast pipe.
Described quiet fast pipe is connected with measuring tube by anemostat, and described anemostat is connected with the pipeline section that described measuring tube is provided with the ultrasonic transducer group.
Ultrasonic transducer on the described 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 the described 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 the transceiver structure and mutually replace as transmitting and receiving element.
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.
The beneficial effects of the utility model are: Time-difference Ultrasonic Flow pick-up unit provided by the utility model, at the quiet speed pipe that is 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, in quiet fast pipe, be furnished with for the ultrasonic transducer of measuring ultrasonic propagation velocity, 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 with the following current time, adverse current time and ultrasonic propagation velocity are brought the flow velocity that calculates gas to be measured in the respective party formula into, 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.Structure 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 device for detecting ultrasonic wave flow provided by the utility model;
Fig. 2 is the semisectional view (wherein the ultrasonic transducer on the measuring tube does not cut open) of Fig. 1.
Embodiment
As shown in Figure 1 and Figure 2, a kind of embodiment of the device for detecting ultrasonic wave flow for implementing the Time-difference Ultrasonic Flow detection method, pick-up unit among this embodiment comprises measuring tube 2, 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 that two pairs are the ultrasonic transducer 1 that the X-type two-channel is arranged, each ultrasonic transducer is the transceiver structure.Be fixed with on the described measuring tube 2 and be connected with pipeline section that measuring tube is provided with the ultrasonic transducer group and for the quiet speed pipe 3 of the gas free diffusing to be measured in this pipeline section, quiet speed pipe 3 is connected on the measuring tube 2 by anemostat 5, and quiet speed pipe 3 is connected with the pipeline section that the ultrasonic transducer group is installed of measuring tube by anemostat, anemostat herein axially is furnished with two along quiet speed pipe, and these two anemostats are apart more closely to prevent gas pulsation occurring in the quiet fast pipe.Be furnished with in the quiet fast pipe emission and receive ultrasound wave to be used for measuring the ultrasonic transducer 4 of ultrasonic propagation velocity at quiet speed pipe 3.The layout of the ultrasonic transducer in the quiet fast pipe herein is: the ultrasonic transducer 4 on the described 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.
In above-described embodiment, the layout 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 the transceiver structure and mutually alternately as transmitting and receiving element.
Perhaps adopt following layout: 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 layout 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.
In above-described embodiment, 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, so, in other embodiments, 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.
Direct measurement when the method and apparatus of measurement ultrasonic propagation velocity 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, measuring method and install simple and reliable.
Claims (5)
1. device for detecting ultrasonic wave flow, 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, this ultrasonic transducer group comprises that being X-type is arranged in two pairs of ultrasonic transducers on the described pipeline section, it is characterized in that, be fixed with on the described measuring tube with pipeline section that measuring tube is provided with the ultrasonic transducer group and be connected, and for the quiet fast container of the gas free diffusing to be measured in this pipeline section, be furnished with in the quiet fast pipe emission and receive ultrasound wave to be used for measuring the ultrasonic transducer of ultrasonic propagation velocity at quiet fast pipe.
2. device for detecting ultrasonic wave flow according to claim 1 is characterized in that, described quiet fast pipe is connected with measuring tube by anemostat, and described anemostat is connected with the pipeline section that described measuring tube is provided with the ultrasonic transducer group.
3. device for detecting ultrasonic wave flow according to claim 1 and 2, it is characterized in that, ultrasonic transducer on the described 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.
4. device for detecting ultrasonic wave flow according to claim 1 and 2, it is characterized in that, ultrasonic transducer on the described 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 the transceiver structure and mutually replace as transmitting and receiving element.
5. device for detecting ultrasonic wave flow according to claim 1 and 2, it is characterized in that, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220421689.1U CN202734881U (en) | 2012-08-23 | 2012-08-23 | Ultrasonic flow detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220421689.1U CN202734881U (en) | 2012-08-23 | 2012-08-23 | Ultrasonic flow detection device |
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| Publication Number | Publication Date |
|---|---|
| CN202734881U true CN202734881U (en) | 2013-02-13 |
Family
ID=47660571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220421689.1U Expired - Lifetime CN202734881U (en) | 2012-08-23 | 2012-08-23 | Ultrasonic flow detection device |
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|---|---|
| CN (1) | CN202734881U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701835A (en) * | 2021-08-30 | 2021-11-26 | 安徽理工大学 | High-precision self-correcting ultrasonic coal bed gas extraction pipe network flowmeter |
-
2012
- 2012-08-23 CN CN201220421689.1U patent/CN202734881U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701835A (en) * | 2021-08-30 | 2021-11-26 | 安徽理工大学 | High-precision self-correcting ultrasonic coal bed gas extraction pipe network flowmeter |
| CN113701835B (en) * | 2021-08-30 | 2023-12-08 | 安徽理工大学 | High-precision self-correction ultrasonic coal bed gas extraction pipe network flowmeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |
|
| CX01 | Expiry of patent term |