CN112747260B - Ultrasonic flow measuring device capable of preventing noise interference - Google Patents
Ultrasonic flow measuring device capable of preventing noise interference Download PDFInfo
- Publication number
- CN112747260B CN112747260B CN202011607669.9A CN202011607669A CN112747260B CN 112747260 B CN112747260 B CN 112747260B CN 202011607669 A CN202011607669 A CN 202011607669A CN 112747260 B CN112747260 B CN 112747260B
- Authority
- CN
- China
- Prior art keywords
- pipeline
- fluid
- ultrasonic flow
- ultrasonic
- vibration damping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02709—Throttle passages in the form of perforated plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses an ultrasonic flow measuring device for preventing noise interference, wherein an upstream pipeline of a measured fluid is connected with a slow vibration structure and a downstream pipeline through a tee joint, the fluid enters the downstream after the upstream interference noise of the fluid is eliminated by the slow vibration structure, enters an energy converter and a display device for measurement after passing through a rectifying distributor, and the interference is eliminated by reflecting and absorbing ultrasonic noise generated due to external reasons in the fluid flow, so that a favorable measuring environment is provided for an ultrasonic flow meter, and high-precision and stable flow data are obtained.
Description
Technical Field
The invention belongs to the technical field of flow measurement, and particularly relates to an ultrasonic flow measurement device capable of preventing noise interference.
Background
In the modern industrial field, pressure, flow and temperature are regarded as three important detection parameters for industrial automation, and the flow meter is widely applied to the aspects of metallurgy, chemical engineering, natural gas transportation, petroleum transportation, civil water meters and the like. The demand for flow metering, whether industrial or commercial, is constantly increasing.
The traditional flowmeter performs flow measurement based on the functional relation between the resistance characteristic and the flow speed of fluid in the flowing process, such as a Venturi flowmeter, an orifice plate flowmeter and the like, and has the similar characteristics that the fluid is in direct contact with a measurement structure, the pressure loss is large, and the measurement range is small. The most serious disadvantages of this type of flowmeter are the sensitivity to wear of the firmware and the low measurement accuracy. With the development of ultrasonic technology and sensor technology, acoustic measurement technology is increasingly widely used. The ultrasonic flow meter has no movable parts, is non-contact, digitalized and electronized, and generally has higher measurement precision, better linearity, wider range ratio, high reliability and simple maintenance in performance, so the ultrasonic flow meter gradually enters various measurement and metering fields.
However, in different application places, the ultrasonic flowmeter is affected by the roughness of the inner wall of the upstream straight pipe section, gas components, the length of the upstream straight pipe section, the flow state of fluid upstream of the flowmeter, noise interference of a water pump and the like, airflow pulsation and the like in the use process, so that the measurement accuracy is affected. In order to overcome the external influence, although a filter is adopted to overcome part of interference, the effect is limited, and therefore other means are needed to reduce noise interference so as to improve the measurement accuracy.
Disclosure of Invention
The invention provides an ultrasonic flow measuring device for preventing noise interference, which eliminates interference by reflecting and absorbing ultrasonic noise generated by external reasons in fluid flow, provides a favorable measuring environment for an ultrasonic flow meter and acquires high-precision flow data.
In order to achieve the above object, the ultrasonic flow measuring device for preventing noise interference according to the present invention includes an ultrasonic flow meter mounted on a pipe to be measured, and a vibration damping structure, where the vibration damping structure includes a vibration damping chamber, a vibration damping film is disposed in the vibration damping chamber, and the vibration damping chamber is filled with air or inert gas.
Further, the vibration damping structure is installed in a direction close to the noise source.
Furthermore, the damping structure is connected to the fluid pipeline to be measured through a three-way joint, the fluid pipeline to be measured comprises an upstream pipeline and a downstream pipeline, and three interfaces of the three-way joint are respectively connected with the upstream pipeline, the downstream pipeline and the damping chamber.
Furthermore, a switch valve is arranged on the vibration damping chamber.
Further, the damping membrane is a movable piston or a fixed flexible plate.
Furthermore, a damping material coating is arranged on the vibration reduction membrane.
Furthermore, a rectifying distributor is installed on an upstream pipeline of the ultrasonic flowmeter and comprises a plate body, the shape of the plate body is the same as the shape and the size of the longitudinal section of the fluid pipeline to be measured, and a plurality of through holes through which fluid flows are formed in the plate body.
Further, the ultrasonic flowmeter comprises a first transducer, a second transducer and a display device, and is used for measuring and displaying the measured fluid.
Compared with the prior art, the invention has at least the following beneficial technical effects:
the invention provides an ultrasonic measuring device for preventing noise interference, wherein a damping film and a damping chamber form a damping system, vibration wave energy acts on the damping film after noise is transmitted by utilizing the compressibility of gas, the vibration wave energy is transmitted to the gas in the damping chamber through the microspur movement or vibration of the damping film, the gas is compressed and converted into heat energy, and the energy dissipation of noise sound waves is realized. By arranging the noise elimination mechanism, ultrasonic noise mixed by other sound sources such as pulsation of fluid flow, fluid interception, a pump and the like is reflected and absorbed, interference is eliminated, a favorable measurement environment is provided for the ultrasonic flowmeter, and accurate flow data is obtained. Compared with the existing ultrasonic flowmeter, the ultrasonic flowmeter has stronger anti-interference capability, and effectively improves the measurement precision and stability.
Furthermore, the damping structure is installed in the direction close to the noise source, and the noise reduction effect is improved.
Furthermore, the switch valve is arranged on the vibration damping chamber, so that the vibration damping chamber can be conveniently inflated or deflated.
Furthermore, a damping material coating is arranged on the damping diaphragm, so that the damping effect is further improved.
Furthermore, a rectification distributor is installed at the upper stream of the ultrasonic flowmeter, and comprises a plate body, wherein the shape of the plate body is the same as the shape and the size of the longitudinal section of the measured fluid pipeline, a plurality of through holes for flowing fluid are formed in the plate body, the elbow of the measured fluid pipeline is subjected to vortex rectification, and the requirement of installing a straight section before the ultrasonic flowmeter is shortened.
Drawings
FIG. 1 is a schematic structural view of an ultrasonic flow measuring apparatus for preventing noise interference according to the present invention;
FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic diagram of an ultrasonic flow meter measurement;
fig. 4 is a schematic diagram of an ultrasonic flow meter.
In the drawings: 1. the ultrasonic flow meter comprises an upstream pipeline, 2, a three-way joint, 3, a mounting flange, 4, a damping membrane, 5, a damping chamber, 6, a switch valve, 7, a rectifying distributor, 8, an ultrasonic flow meter, 9, a downstream pipeline, 10, a through hole, 11, a first transducer, 12, a second transducer, 13 and a through hole.
Detailed Description
In order to make the objects and technical solutions of the present invention clearer and more understandable. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The main principle of the invention for preventing noise interference is to utilize the characteristics of sound wave transmission reflection and damping absorption, and arrange a vibration reduction film with the functions of reflection and absorption in the main direction of noise sound wave transmission to reflect and absorb the transmission energy of the noise sound wave.
Example 1
Referring to fig. 1, an ultrasonic flow measuring device for preventing noise interference includes a measuring fluid pipe 1, a three-way joint 2, a mounting flange 3, a damping membrane 4, a damping chamber 5, a switching valve 6, a rectifying distributor 7, and an ultrasonic flow meter 8, where the ultrasonic flow meter 8 includes two transducers and a display screen.
The fluid measurement pipeline comprises an upstream pipeline 1 and a downstream pipeline 9, the upstream pipeline 1 is connected with a vibration damping structure and the downstream pipeline 9 through a three-way joint 2, an ultrasonic flowmeter 8 is installed on the downstream pipeline 9, fluid enters the downstream pipeline 9 after upstream interference noise is eliminated through the vibration damping structure, and enters the ultrasonic flowmeter 8 for measurement after passing through a rectifying distributor 7. When the downstream direction of the fluid flow is interfered by a noise source, the device of the same type can also be arranged to damp the downstream noise. The upstream of the measuring fluid line 1 communicates with the inlet of the three-way connection 2.
The vibration damping structure comprises a vibration damping chamber 5, a vibration damping membrane 4 and a switch valve 6, wherein the vibration damping chamber 5 and the upstream part of the measuring fluid pipeline 1 are coaxially arranged; the vibration damping chamber 5 is arranged at a first outlet of the three-way joint 2 through a mounting flange 3, and the vibration damping film 4 can be a piston type flexible plate which can freely move along the inner wall of the vibration damping chamber 5 or can be fixedly arranged, and has a larger damping coefficient. Filling air or inert gas into the vibration damping chamber 5 through the switch valve 6, wherein the filling pressure is approximately equal to the fluid pressure, and specifically, the fluid pressure is plus or minus 20 percent; the function of the elastic compression space is to balance the fluid pressure and form an elastic compression space. Extreme accidents need to be considered for selecting the gas, namely, the gas leaks to the main flow working medium when the damping film is damaged, and the accident expansion is not caused. The noise from the fluid upstream propagates along the fluid, and the sound wave reaches the damping membrane 4 and is reflected and absorbed by the damping membrane 4.
The damping diaphragm 4 and the damping chamber 5 form a damping system, the compressibility of gas is utilized, after noise is transmitted, vibration wave energy acts on the damping diaphragm, the gas is transmitted to the damping chamber 5 through the microspur movement or vibration of the damping diaphragm 4, and the gas is compressed and converted into heat energy, so that the energy dissipation of noise sound waves is realized.
Preferably, a damping material coating can be additionally arranged on the vibration damping film 4, so that the vibration damping effect is further improved.
The downstream pipeline 9 is provided with a rectifying distributor 7, and the rectifying distributor 7 is used for rectifying the vortex caused by the elbow of the measured fluid pipeline and shortening the requirement of installing a straight section in front of the ultrasonic flowmeter 8. The rectifier distributor 7 may not be installed depending on the requirements of installation space and the actual situation of the site.
Referring to fig. 2, the rectifying distributor 7 includes a plate body, the shape of the plate body is the same as the shape and size of the longitudinal section of the fluid pipeline to be measured, and a plurality of circular through holes 13 are formed in the plate body.
The fluid in the fluid pipeline 1 to be measured is a liquid or gas single-phase medium, and no phase change is generated in the fluid pipeline and the flowmeter. The measured fluid pipeline 1 is a round pipe or a square pipe.
Referring to fig. 3, the ultrasonic flow meter 8 includes a first transducer 11, a second transducer 12, and a display device for measuring and displaying the flow of the measured fluid.
The ultrasonic flowmeter is divided into the following parts according to the measurement principle: a propagation velocity difference method (simply referred to as a velocity difference method), a doppler effect method, a noise method, a correlation method, and the like, and the velocity difference method and the doppler effect method are commonly used. The Doppler method is used for determining the flow of fluid by measuring the ultrasonic Doppler frequency shift scattered by a scatterer in inhomogeneous fluid by using the acoustic Doppler principle, and is suitable for measuring the flow of two-phase flow containing suspended particles, bubbles and the like. The differential method comprises the following steps: the basic principle of the direct time difference method, the phase difference method and the frequency difference method is that the flow velocity of the fluid is reflected by measuring the difference between the forward and backward propagation velocities of ultrasonic pulse, wherein the frequency difference method and the time difference method overcome the error caused by the change of sound velocity along with the temperature of the fluid, have higher accuracy and are widely adopted. Ultrasonic gas flow meters typically use a differential method. The differential method is mainly applied to the measurement of single-phase fluid.
The following briefly introduces the basic measurement principle of the ultrasonic gas flowmeter by taking a time difference method as an example:
on the measuring tube section of the instrument, a pair of ultrasonic transducers are obliquely arranged: a first ultrasonic transducer 11 and a second transducer 12 which alternately transmit and receive ultrasonic pulses, as shown in fig. 3. In fig. 3: c is the speed of sound in the fluid medium; v is the flow rate of the fluid medium in the pipeline; l is the length of the sound path; theta is an included angle between the transducer and the axis of the pipeline; d is the diameter of the pipeline.
On the sound path L, the propagation velocity of the ultrasonic wave is the superposition of the sound velocity and the flow velocity component. Propagation time t in forward and reverse flow directions 1 、t 2 Respectively as follows:
the propagation time t in the forward and backward directions is measured 1 、t 2 The flow velocity V can then be calculated:
because of the measured forward and backward propagation times t 1 、t 2 Incorporating inherent electroacoustic delays τ produced by circuits, cables, transducers, etc 1 、τ 2 Since the influence is to be subtracted, equation (3) can be rewritten as:
the actual fluid flow velocity has flow velocity distribution on the pipeline loading surface due to friction and viscosity action of the pipe wall and the fluid inside, the measured flow velocity V of the single-channel ultrasonic flowmeter on the central line is actually the linear average velocity on the inner diameter of the pipeline section, and the surface average flow velocity V of the pipeline section is required for measuring the flow m They are not equal. According to the theory of fluid mechanics, when the reynolds number is greater than 4000, the fluid is in a turbulent state, and a kinetic factor K (a function of the reynolds number Re of the pipeline, which can be obtained by actual measurement in the process of calibrating the flowmeter) exists between the linear average flow velocity and the surface average flow velocity, that is:
so as to obtain the instantaneous volume flow Q Instant heating device ：
In continuous measurement, only Q to be measured is required one by one Instant heating device The value is integrated with time, so that the accumulated flow Q in any time period can be obtained Tired of After the volume flow is compensated by pressure and temperature, the mass flow Q can be obtained Quality of food ：
In the formula: rho 0 Is the density of the gas medium in a standard state; p 0 And P is the pressure in the standard state and the actual state respectively; t0 and T are temperatures in a standard state and an actual state respectively; and Z is the gas compression coefficient. As can be seen from the formulas (4) and (6), sound is producedTime t 1 、t 2 Is the key to flow measurement, at D, L, θ, τ 1 、τ 2 After K is determined, only t needs to be accurately measured 1 、t 2 Can accurately obtain the flow velocity V and the instantaneous flow Q in the pipeline Instant heating Further, the accumulated flow rate Q can be obtained Tired of Mass flow rate Q Quality of food 。
The schematic diagram of the ultrasonic flowmeter is shown in FIG. 4: the first transducer 11 and the second transducer 12 are respectively installed on two sides of a fluid line and are at a certain distance from each other, ultrasonic emission mainly comprises a master control oscillator, a switcher and the like, ultrasonic emission is achieved by a sawtooth wave voltage generator through signal processing of the master control oscillator, a sending pulse signal required by the transducers is obtained, the first ultrasonic transducer is driven to emit an ultrasonic signal, and when the transducers are in resonance due to the adoption of an inductance-capacitance matching circuit, piezoelectric ceramics generate enough vibration energy and send out a high-power ultrasonic signal. The function of the switcher is that the transceiving control circuit controls the transmitting and receiving of pulse signals, after ultrasonic signals transmitted by the first transducer 11 are transmitted to the second transducer 12, the switch of the switcher controls the second transducer 12, the second transducer 12 obtains received ultrasonic signals, the received waveforms and the transmitted waveforms pass through the receiving amplifier and the output gate to be subjected to logic processing of a digital circuit through a peak detector, a differential amplifier and the like through the receiving amplifier and the output gate, time signals are obtained, data processing and calculation are carried out, and finally flow data are obtained and displayed.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. An ultrasonic flow measuring device for preventing noise interference is characterized by comprising an ultrasonic flow meter (8) and a vibration damping structure, wherein the ultrasonic flow meter is installed on a measured pipeline, the vibration damping structure comprises a vibration damping chamber (5), a vibration damping film (4) is arranged in the vibration damping chamber (5), and air or inert gas is filled in the vibration damping chamber (5);
the damping structure is connected to a measured fluid pipeline through a three-way joint (2), the measured fluid pipeline comprises an upstream pipeline (1) and a downstream pipeline (9), and three interfaces of the three-way joint (2) are respectively connected with the upstream pipeline (1), the downstream pipeline (9) and a damping chamber (5); the vibration damping chamber (5) and the upstream pipeline (1) are coaxially arranged; the ultrasonic flowmeter (8) is mounted on a downstream pipeline (9);
the damping membrane (4) is a movable piston or a fixed flexible plate.
2. An ultrasonic flow measurement device against noise interference according to claim 1, wherein the vibration attenuating structure is installed in a direction close to the noise source.
3. An ultrasonic flow measuring device for preventing noise interference according to claim 1, wherein the damping chamber (5) is provided with a switching valve (6).
4. An ultrasonic flow measuring device for preventing noise interference according to claim 1, wherein the damping membrane (4) is provided with a coating of damping material.
5. An ultrasonic flow measuring device for preventing noise interference according to claim 1, wherein the rectifying distributor (7) is installed on the upstream pipeline of the ultrasonic flow meter (8), the rectifying distributor (7) comprises a plate body, the shape of the plate body is the same as the shape and the size of the longitudinal section of the pipeline for measuring the fluid, and a plurality of through holes (13) for the fluid to flow through are formed on the plate body.
6. An ultrasonic flow measurement device for noise immunity according to claim 1, wherein the ultrasonic flow meter (8) comprises a first transducer (11), a second transducer (12) and a display device for measuring and displaying the flow of the measured fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011607669.9A CN112747260B (en) | 2020-12-29 | 2020-12-29 | Ultrasonic flow measuring device capable of preventing noise interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011607669.9A CN112747260B (en) | 2020-12-29 | 2020-12-29 | Ultrasonic flow measuring device capable of preventing noise interference |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112747260A CN112747260A (en) | 2021-05-04 |
| CN112747260B true CN112747260B (en) | 2023-01-03 |
Family
ID=75649444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011607669.9A Active CN112747260B (en) | 2020-12-29 | 2020-12-29 | Ultrasonic flow measuring device capable of preventing noise interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112747260B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216056A (en) * | 2021-12-22 | 2022-03-22 | 华能酒泉发电有限公司 | Method for measuring local pressure loss of conveying steam pipe |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3922233B2 (en) * | 2001-10-31 | 2007-05-30 | 松下電器産業株式会社 | Ultrasonic flow measuring device |
| DE102004060065B4 (en) * | 2004-12-14 | 2016-10-20 | Robert Bosch Gmbh | Ultrasonic flow meter with guide elements |
| CN107014450B (en) * | 2017-04-29 | 2023-11-14 | 成都伦慈仪表有限公司 | Noise reduction rectifying structure and ultrasonic flowmeter comprising same |
| CN207850450U (en) * | 2017-12-05 | 2018-09-11 | 山东思达特测控设备有限公司 | A kind of Ultrasonic Wave Flowmeter noise reduction fairing |
| CN209085689U (en) * | 2018-10-24 | 2019-07-09 | 青岛和晟思壮测控技术有限公司 | A kind of ultrasonic flowmeter noise reduction fairing |
| CN210141903U (en) * | 2019-07-08 | 2020-03-13 | 大连普林斯电子有限公司 | Noise reduction device of gas ultrasonic flowmeter |
| CN210664616U (en) * | 2019-07-29 | 2020-06-02 | 大连圣世援测控技术有限公司 | Anti-interference device for ultrasonic flowmeter |
| CN111220223B (en) * | 2020-03-30 | 2021-09-28 | 江南大学 | Ultrasonic flowmeter based on micro-channel |
-
2020
- 2020-12-29 CN CN202011607669.9A patent/CN112747260B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112747260A (en) | 2021-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6575043B1 (en) | Method and apparatus for characterizing flows based on attenuation of in-wall propagating wave modes | |
| CN101084415B (en) | Ultrasonic flowmeter having a pressure sensor | |
| EP0681685B1 (en) | Fluid flow meter | |
| CN114088151B (en) | External clamping type multichannel ultrasonic flow detection device and detection method | |
| CN114001804B (en) | Calibration method and system of ultrasonic metering device based on time difference method | |
| CN112747260B (en) | Ultrasonic flow measuring device capable of preventing noise interference | |
| CN101793908A (en) | Ultrasonic flue gas flow rate meter | |
| CN102829829B (en) | A kind of Time-difference Ultrasonic Flow detection method and device | |
| WO2005083371A1 (en) | Doppler type ultrasonic flowmeter | |
| JP2006078362A (en) | Coaxial-type doppler ultrasonic current meter | |
| Li et al. | Design of miniature clamp-on ultrasonic flow measurement transducers | |
| CN102829830B (en) | Method and the device of ultrasonic propagation velocity is detected in detecting for ultrasonic flow | |
| CN102914333A (en) | Detection method of using ultrasonic waves for flow detection | |
| Johari et al. | Direct measurement of circulation using ultrasound | |
| US3204457A (en) | Ultrasonic flowmeter | |
| CN103674146A (en) | Mass flow meter based on ultrasonic flow meter | |
| RU2396518C2 (en) | Method and device for acoustic measurement of gas flow rate | |
| JPH11230799A (en) | Ultrasonic flowmeter | |
| KR102088845B1 (en) | Method for measuring flow rate of ultrasonic flow meter including recessed ultrasonic transducer | |
| RU2422777C1 (en) | Ultrasonic procedure for measurement of flow rate of liquid and/or gaseous mediums and device for its implementation | |
| CN107490406B (en) | Ultrasonic vortex street flowmeter | |
| CN202734881U (en) | Ultrasonic flow detection device | |
| Comes et al. | Ultrasonic flowmeter | |
| WO2007074779A1 (en) | Ultrasonic flowmeter and wedge for use in ultrasonic flowmeter | |
| CN202956153U (en) | Ultrasonic gas flow meter through time difference method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |