CN112857488A - Ultrasonic gas flow measuring method and device - Google Patents
Ultrasonic gas flow measuring method and device Download PDFInfo
- Publication number
- CN112857488A CN112857488A CN201911194217.XA CN201911194217A CN112857488A CN 112857488 A CN112857488 A CN 112857488A CN 201911194217 A CN201911194217 A CN 201911194217A CN 112857488 A CN112857488 A CN 112857488A
- Authority
- CN
- China
- Prior art keywords
- gas
- ultrasonic
- air path
- gas flow
- gas channel
- 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.)
- Pending
Links
Images
Classifications
-
- 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
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to an ultrasonic gas flow measuring method and device, belonging to the technical field of fluid flow measurement, and the method comprises the following steps: the method comprises the following steps that a first air path and a second air path which have the same flow speed, opposite flow directions and the same length are formed by measured gas flow; transmitting ultrasonic signals at first ends of the first air path and the second air path, wherein the ultrasonic signals are transmitted along the first air path and the second air path; receiving ultrasonic signals transmitted along the first air path and the second air path at second ends of the first air path and the second air path respectively; and calculating the gas flow according to the time difference of the received ultrasonic signals. The invention adopts the common transducer to realize the homologous and synchronous acquisition of the transmitted signals, reduces the cost of the gas flow measuring device and improves the measuring precision.
Description
Technical Field
The invention relates to an ultrasonic gas flow measuring method and device, belonging to the technical field of fluid flow measurement.
Background
In the existing ultrasonic gas flow measuring method, a time difference method is adopted mostly. The time difference method is to measure the flow velocity of gas by using the time difference generated by forward flow propagation and backward flow propagation of ultrasonic signals in the gas, and the structural principle of the traditional device for measuring gas quantity by the time difference method is shown in fig. 1. In the figure, an ultrasonic transducer A and an ultrasonic transducer B both serve as a transmitter and a receiver, the receiving or sending state of the transducers is controlled by an analog switch, one transducer works in the sending state, and the other transducer works in the receiving state, so that forward flow timing and reverse flow are alternately performed in time. For example, the ultrasonic transducer a is firstly used as a transmitting end to transmit an ultrasonic signal in the downstream direction to the ultrasonic transducer B, and the ultrasonic transducer B is used as a receiving end to time after receiving the ultrasonic signal, so as to obtain the downstream time consumed by the ultrasonic signal; and then the ultrasonic transducer B is immediately used as a transmitting end to transmit an ultrasonic signal in the reverse airflow direction to the ultrasonic transducer A, the ultrasonic transducer A is used as a receiving end to time after receiving the ultrasonic signal, the downstream consumption time of the ultrasonic signal is obtained, the flow velocity of the gas to be detected is calculated according to the time difference between the downstream and the reverse flow, and the gas flow can be further obtained according to the pipe diameter.
When the traditional time difference method is used for measurement, the ultrasonic transducer not only serves as a transmitter, but also serves as a receiver, cannot work simultaneously, is in an intermittent sampling state, samples of forward flow and reverse flow are not simultaneous, and transmitting signals are different in source, so that the measurement precision is greatly influenced.
Chinese patent application publication No. CN108692777A discloses a novel time-difference ultrasonic flowmeter. As shown in fig. 2, this scheme employs a novel ultrasonic transducer (23, 25) having a two-sided structure, one for transmitting signals and one for receiving signals. By changing the installation mode of the ultrasonic flowmeter, the sampling of forward flow and backward flow has synchronism.
However, in the above scheme, the novel double-sided ultrasonic transducer must be used as an ultrasonic generator and an ultrasonic receiver to simultaneously and respectively work to realize synchronous sampling of forward flow and backward flow, which leads to the following problems: 1) the novel double-sided ultrasonic transducer needs to be customized, and the cost is high; 2) the two double-sided ultrasonic transducers need to be synchronously controlled, and the requirement on the synchronous precision of synchronous sampling is higher, so that the requirement on the control is higher; 3) the installation positions and angles of the ultrasonic transducers (23, 25) and the reflecting sheets (22, 24) are strict, a propagation sound channel of the ultrasonic wave needs to form a parallelogram, and the lengths of opposite sides of the parallelogram need to be consistent. The above requirements affect the accuracy and precision of the measurement if any deviation exists.
Chinese patent application publication No. CN108458761A discloses a multichannel time difference method ultrasonic flowmeter. As shown in FIG. 3, the scheme adopts an ultrasonic transducer C with a special fan-shaped matching layer, the ultrasonic transducer with the special fan-shaped matching layer is taken as an ultrasonic transmitter and is arranged on one side of a pipeline D, and ultrasonic receivers (A1, A2, A3, B1, B2 and B3) are arranged on two opposite sides of the ultrasonic transmitter, so that sampling of forward flow and backward flow is synchronous, data acquired by ultrasonic flow of a plurality of sound channels can be obtained, and the measurement accuracy is improved.
However, the above-mentioned solution requires an ultrasonic transmitting transducer with a special fan-shaped matching layer capable of forming six transmitting surfaces, and requires a high customization cost. And the angle difference between two adjacent emitting surfaces is 5 degrees, the ultrasonic receivers (A1, A2, A3, B1, B2 and B3) need to be respectively and accurately installed at the positions in the emitting range and adjusted to proper angles, so that accurate receiving of signals can be ensured, the process requirement is high, and the precision is reduced due to errors. In the scheme, the component of the ultrasonic signal in the flowing direction of the gas to be measured is the effective upstream or downstream to be measured, and the accuracy of measurement and subsequent calculation is reduced due to small measurement.
Disclosure of Invention
The invention aims to provide an ultrasonic gas flow measuring method and device, which are used for solving the problems of cost increase, complex process and incapability of further improving the measuring precision caused by synchronous sampling of forward flow and backward flow and homologous emission signals when the gas flow is measured in the prior art.
In order to achieve the above object, the scheme of the invention comprises:
the invention relates to an ultrasonic gas flow measuring method, which comprises the following steps:
1) the method comprises the following steps that a first air path and a second air path which have the same flow speed, opposite flow directions and the same length are formed by measured gas flow;
2) transmitting ultrasonic signals at first ends of the first air path and the second air path, wherein the ultrasonic signals are transmitted along the first air path and the second air path;
3) receiving ultrasonic signals transmitted along the first air path and the second air path at second ends of the first air path and the second air path respectively;
4) and calculating the gas flow according to the time difference of the received ultrasonic signals.
Each transducer adopted by the invention only works in one mode (a transmitting mode or a receiving mode), a switching circuit is not needed, the circuit is simplified, and the requirement on a chip is reduced. The main control MCU sends a primary excitation signal to complete downstream and upstream signal acquisition and realize signal acquisition synchronization; the same transducer is excited to generate ultrasonic signals, so that signal homology is realized, and the measurement precision is improved.
Further, the first air path and the second air path are parallel to each other.
Further, the first air path and the second air path are adjacently arranged.
The two gas paths are adjacently and closely arranged, so that the structure of the gas flow channel is simplified, and the occupied volume of the gas flow channel is reduced. And the air passages arranged in parallel can realize the calculation of the gas flow only through a common ultrasonic transducer, and the transducer does not need to be modified or additionally provided with a special structure, thereby reducing the cost.
The invention relates to an ultrasonic gas flow measuring device, which comprises a first gas channel and a second gas channel, wherein the first gas channel and the second gas channel have the same cross section and the same length; the gas flow in the first gas channel and the second gas channel is opposite in flow direction; the first gas channel and the second gas channel are provided with connected ends, an ultrasonic transmitter is arranged at the connected end of the first gas channel and the second gas channel, and an ultrasonic signal sent by the ultrasonic transmitter is transmitted along the first gas channel and the second gas channel; and the other ends of the first gas channel and the second gas channel are provided with ultrasonic receivers, and the ultrasonic receivers are used for receiving ultrasonic signals transmitted along the first gas channel and the second gas channel.
The invention can realize the calculation of the gas flow through the common ultrasonic transducer, and the transducer does not need to be modified or additionally provided with a special structure, thereby reducing the cost; each transducer only works in one mode (transmitting mode or receiving mode), and a switching circuit is not needed, so that the circuit is simplified, and the requirement on a chip is reduced. The main control MCU sends a primary excitation signal to complete downstream and upstream signal acquisition and realize signal acquisition synchronization; the same transducer is excited to generate ultrasonic signals, so that signal homology is realized, and the measurement precision is improved.
Further, the first gas channel and the second gas channel are connected at one end connected through a bent pipe with a set radian.
The first gas channel is connected with one end of the second gas channel, that is, one end of the first gas channel is connected with one end of the second gas channel through other channels which may be very long, and the scheme is that the first gas channel and the second gas channel are directly reversed and folded back and connected at the connected ends through a bent pipe, for example. The scheme simplifies the structure and improves the measurement precision.
Furthermore, the first gas channel, the second gas channel and the bent pipe form a U-shaped pipeline.
Furthermore, the first gas channel, the second gas channel and the bent pipe form a V-shaped pipeline.
Further, the first gas channel and the second gas channel are parallel to each other.
Further, the first gas passage and the second gas passage are adjacently disposed.
The two gas channels are adjacently and closely arranged, so that the structure of the gas channel is simplified, and the occupied volume of the gas channel is reduced.
Further, the first gas passage and the second gas passage are formed by providing a partition plate in one chamber.
Drawings
FIG. 1 is a schematic diagram of a prior art ultrasonic gas flow measurement;
FIG. 2 is a schematic structural view of an ultrasonic flow meter mounting disclosed in patent publication No. CN 108692777A;
FIG. 3 is a schematic structural view of an ultrasonic flow meter mounting disclosed in patent publication No. CN 108458761A;
FIG. 4 is a schematic diagram of an ultrasonic gas flow measurement of the present invention;
FIG. 5 is a schematic view of the gas passages of the ultrasonic gas flow measuring device of the present invention;
FIG. 6 is a timing diagram for ultrasonic gas flow measurement of the present invention;
FIG. 7 is a schematic view of a gas flow passage of an ultrasonic gas flow rate measuring device according to example 2 of the present invention;
fig. 8 is a schematic view of a gas flow passage of an ultrasonic gas flow rate measuring device according to embodiment 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
fig. 4 shows an ultrasonic gas flow measurement schematic diagram of the present invention, which includes a main control MCU, a transmitting transducer, two receiving transducers and a gas flow channel. The transmitting transducer and the receiving transducer are respectively arranged at two ends of the gas flow channel, the main control MCU is connected with the transmitting transducer (namely transducer A) through a transmitting amplifying circuit, and the main control MCU is connected with the two receiving transducers (namely transducer B and transducer C) through two receiving amplifying circuits respectively.
When the invention is used for measuring the gas flow, the main control MCU sends out an excitation signal, the transmission transducer (transducer A) is excited after passing through the transmission amplifying circuit, the transmission transducer (transducer A) transmits ultrasonic waves, the ultrasonic waves pass through a gas flow passage, since the flight direction of the ultrasonic waves is the same as (i.e. co-current) or opposite (i.e. counter-current) to the gas flow direction in the gas flow channel directly affects the flight speed of the ultrasonic waves, therefore, the two receiving transducers (transducer B and transducer C) can receive the ultrasonic signals successively, after any one receiving transducer receives the ultrasonic signals, the generated echo signals are amplified by the receiving and amplifying circuit and then are collected by the main control MCU and the collection time is recorded, when the main control MCU collects the echo signals of two receiving transducers (transducer B and transducer C), obtaining the flight time of the ultrasonic waves of forward flow and reverse flow flight according to the time of the master control MCU for transmitting the excitation signal; by comparing the receiving time of the two echo signals, the receiving time difference of the two echo signals can be obtained, the gas flow velocity in the gas flow channel is further calculated, the gas flow is obtained according to the pipe diameter of the pipeline in the gas flow channel, and one-time sampling measurement is completed. As shown in the measurement timing chart of fig. 6, the time TA is the time when the master MCU sends out the excitation signal, that is, the time when the transmitting transducer (transducer a) sends out the ultrasonic wave; the TB time is the time when the main control MCU acquires a first echo signal, namely the time when a receiving transducer (transducer B or transducer C) receives the downstream-flying ultrasonic wave; the TC time is the time when the main control MCU acquires a second echo signal, namely the time when a receiving transducer (transducer B or transducer C) receives the ultrasonic wave of the countercurrent flight; and TC-TB is the receiving time difference of the two echo signals.
The gas flow channel structure of the present invention and its specific arrangement relationship with the ultrasonic transducers are shown in fig. 5, and include a transducer a for transmission, a transducer B and a transducer C for reception, an inlet pipe 1 of the gas flow channel, an outlet pipe 4 of the gas flow channel, a first gas channel 2 and a second gas channel 3. The first gas channel 2 and the second gas channel 3 have the same length, the same cross-sectional area (same pipe diameter), and are arranged in parallel and closely, and the gas flow directions therein are opposite. Specifically, the pipeline structure can be formed by additionally arranging a partition plate D in a section of thick pipeline and arranging an air inlet and an air outlet (the air inlet is connected with the inlet pipeline 1, and the air outlet is connected with the outlet pipeline 4) on the upper side and the lower side of the partition plate at one end of the thick pipeline. One section of long straight pipe can be bent into a U shape, the two sections of straight pipes of the U-shaped pipeline respectively form a first gas channel 2 and a second gas channel 3, and the end parts of the two sections of straight pipes of the U-shaped pipeline are respectively provided with a gas inlet and a gas outlet in opposite directions (the gas inlet is connected with the inlet pipeline 1, and the gas outlet is connected with the outlet pipeline 4). The invention is not limited with respect to what process is used to form the first gas channel 2 and the second gas channel 3 in parallel and in close proximity. The pipe in the gas flow passage may be a circular pipe or a square passage, and the cross-sectional shape of the pipe in the gas flow passage is not limited in this embodiment. The ultrasonic transducer used in the embodiment is a common standard ultrasonic transducer. The method for installing the ultrasonic transducer on the gas channel comprises the steps that a round hole with a standard size is formed in the corresponding position of the gas channel, the ultrasonic transducer is embedded in the round hole in an interference fit mode through a rubber lining ring surrounding the outer peripheral surface, and meanwhile airtight fit is achieved.
The emitting port of the transducer A is arranged at one end (the right end in FIG. 5) of the first gas channel 2 and the second gas channel 3 towards the direction of the first gas channel 2 and the second gas channel 3, and the emitting range covers the whole end of the first gas channel 2 and the second gas channel 3; the receiving port of the transducer B is provided at the other end of the first gas passage 2 (the other end with respect to the end at which the transducer a is provided, the left end in fig. 5) toward the direction of the first gas passage 2, and its receiving range covers the end of the first gas passage 2; the receiving opening of the transducer C is provided at the other end of the second gas passage 3 (the other end with respect to the end at which the transducer a is provided, the left end in fig. 5) toward the second gas passage 3 with its receiving range covering the end of the second gas passage 3.
Gas flows into the gas flow path from the inlet pipe 1 and flows out of the gas flow path from the outlet pipe 4, and gas paths in the directions indicated by solid arrows in the drawing are formed in the first gas channel 2 and the second gas channel 3, respectively (gas paths from left to right in fig. 5 are formed in the first gas channel 2, and gas paths from right to left in fig. 5 are formed in the second gas channel 3). The transducer a acts as a transmitting transducer to transmit ultrasonic waves (transmitted from right to left, as indicated by the dashed arrow in fig. 5) along the axial direction of the first gas passage 2 and the second gas passage 3 after receiving the excitation signal, the flight path of the ultrasonic wave signal covers the first gas passage 2 and the second gas passage 3, the ultrasonic waves are transmitted in the first gas passage 2 in a counter-current manner (from the transducer a to the transducer B), and the ultrasonic waves are transmitted in the second gas passage 3 in a co-current manner (from the transducer a to the transducer C). The transducer B receives ultrasonic waves transmitted in a countercurrent mode and feeds back echo signals, the transducer C receives ultrasonic waves transmitted in a downstream mode and feeds back echo signals, and the master control MCU receives the two echo signals and then completes measurement.
The key point of the invention is that the air flow forms two air paths in opposite directions, one transducer is arranged at one end of the two air paths to be used as a transmitting end to realize homologous transmission, and the two transducers are respectively used for receiving at the other ends of the two air paths to realize synchronous receiving, namely, the sent ultrasonic signals respectively reach the two receiving transducers through forward flow and reverse flow through single-transmitting double-receiving.
It should be understood by those skilled in the art that the time-difference measurement of the gas flow is to calculate the gas flow rate first and then further calculate the gas flow rate according to the pipe diameter, so that the gas flow rates of the gas flow channels of the present invention should be the same (at least the gas flow rates in the first gas channel 2 and the second gas channel 3 should be the same and uniform everywhere). The mass and the flow of the gas flowing in the pipeline are fixed, and the average flow velocity of the gas in the pipeline is related to the pipe diameter, the temperature and the pressure. Therefore, if the channel in the gas flow channel is a circular cross-section pipe, the diameter of the pipe should be the same everywhere, while ensuring the temperature to be the same everywhere in the gas flow channel as much as possible. In addition, bends in the pipeline can cause secondary flows, which affect the velocity field and thus the measurement accuracy of the gas flow rate. As a preferred embodiment, the length of the gas channel, the diameter and the radian of the elbow are optimized, and the optimal bending diameter is selected to reduce the influence of secondary flow. In addition, the rule of the deviation of the measured data caused by the bent pipe can be searched based on the statistical data, and the flow correction is carried out through a correction algorithm, so that the calibration of the measurement precision is realized.
The invention is characterized in that:
1) by controlling 3 common ultrasonic transducers, single-transmitting and double-receiving are realized in the forward flow direction and the reverse flow direction, and the flight time of the forward flow direction and the reverse flow direction is obtained;
2) the same ultrasonic transducer is used as a transmitting transducer to send out ultrasonic signals, and the signals are sent to realize homology;
3) the homologous signals simultaneously fly in the forward flow direction and the reverse flow direction to reach the receiving transducer, so that the forward flow and the reverse flow synchronous sampling is realized;
4) one ultrasonic transducer sends an ultrasonic signal, the two ultrasonic transducers receive the ultrasonic signal, and each ultrasonic transducer is in a single sending or receiving state without controlling a sending and receiving state by an analog switch; the circuit design is optimized without an analog switch circuit, the working control time of the main control MCU is reduced, and the power consumption is reduced; meanwhile, (4) the peripheral circuit is simple, the requirement on the MCU is low, the MCU is not limited by a special chip, the selection range of the MCU chip is enlarged, and the chip cost is reduced;
6) the main control MCU sends a signal once to complete the signal acquisition of forward flow and reverse flow, and the signal homology is ensured; under the condition of sending signals with same source, the signals are influenced by conditions such as crystal oscillator frequency deviation, environment temperature and the like to be consistent, and the measurement precision is improved;
8) in the invention, the transmitting transducer and the receiving transducer both adopt common transducers, and the cost is reduced without customization or modification.
Example 2:
the present invention also has the following embodiments where the accuracy or cost is not required to be high. The modification of this embodiment lies in the structure of the gas flow path, as shown in fig. 7, and similar to embodiment 1, the gas flow path of this embodiment also forms a first gas channel 2 and a second gas channel 3 which have the same length, the same pipe diameter, are arranged in parallel, and have opposite gas flow directions. While the present embodiment is different from embodiment 1 in that there is a certain space (adjacent but not connected) between the first gas channel 2 and the second gas channel 3, it should be understood by those skilled in the art that, in order to ensure the measurement effect, the space between the first gas channel 2 and the second gas channel 3 should be as small as possible; when standard transducers are used for cost reduction, too large a spacing will result in too small a component of the ultrasonic wave emitted by the transmitting transducer a1 propagating along the first gas channel 2 and the second gas channel 3, and the ultrasonic signals received by the receiving transducers B1 and C1 will have too weak an influence on the measurement accuracy. In this embodiment, the spacer thickness is at least less than one third of the diameter of the transmitting transducer a 1. One ends of the first gas channel 2 and the second gas channel 3 are connected; the first gas channel 2 at the other end is connected with an inlet pipeline 1, and the second gas channel 3 is connected with an outlet pipeline 4. Specifically, the pipe can be formed by bending a section of pipe, or by connecting a plurality of sections of straight pipes and elbows.
A transmitting transducer A1 is arranged on one end of the first gas channel 2 connected with the second gas channel 3 and faces to the direction of the first gas channel 2 and the second gas channel 3; the other end of the first gas passage 2 is provided with a receiving transducer B1 toward the transmitting transducer A1, and the other end of the second gas passage 3 is provided with a receiving transducer C1 toward the transmitting transducer A1. The transducers A1, B1, C1 are each connected to a controller (master MCU).
The method for calculating the gas flow rate based on the gas flow channel of this embodiment is the same as that of embodiment 1, and will not be described herein again.
Example 3:
the present invention also has the following embodiments for the case where the cost requirement is not high. The present embodiment is different from embodiment 1 in that the structure of the pipeline in the gas flow channel, as shown in fig. 8, the first gas channel 2 and the second gas channel 3 which have the same length and the same pipe diameter and in which the gas flow directions are opposite (the "opposite flow directions" in the present embodiment should not be limited to the gas flow directions being collinear and absolutely opposite, and the components of the gas flow directions being opposite in the collinear can also be considered as "opposite flow directions") are also formed in the gas flow channel in the present embodiment, and different from the present embodiment, the first gas channel 2 and the second gas channel 3 in the present embodiment are not arranged in parallel and closely. One end of the first gas channel 2 is connected with one end of the second gas channel 3, and the other end of the first gas channel is opened with a certain included angle. The transmitting transducer A3 is arranged at one end where the first gas channel 2 and the second gas channel 3 are connected, and the transmitting surface is processed to emit ultrasonic waves with a certain included angle in two directions to fly along the first gas channel 2 and the second gas channel 3 respectively. The other ends of the first gas passage 2 and the second gas passage 3 are provided with receiving transducers B3, C3, respectively. The ultrasonic waves from the transmitting transducer A3 to the receiving transducer B3 fly in countercurrent and the ultrasonic waves from the transmitting transducer A3 to the receiving transducer C3 fly in cocurrent. The specific method for calculating the gas flow rate is the same as that in embodiment 1, and is not described herein again. In this embodiment, the standard ultrasonic transducer in embodiment 1 cannot be used, and the transducer needs to be modified to some extent, which increases the cost to some extent compared with embodiment 1.
Specifically, the method for processing the surface of the transmitting transducer A3 to enable the surface to transmit ultrasonic waves in two directions with a certain included angle may be to dispose a sector matching layer on the surface of the transmitting transducer A3, and the method is specifically described in chinese patent document with publication No. CN108458761A, and is not repeated in this embodiment.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (10)
1. An ultrasonic gas flow measuring method is characterized by comprising the following steps:
1) the method comprises the following steps that a first air path and a second air path which have the same flow speed, opposite flow directions and the same length are formed by measured gas flow;
2) transmitting ultrasonic signals at first ends of the first air path and the second air path, wherein the ultrasonic signals are transmitted along the first air path and the second air path;
3) receiving ultrasonic signals transmitted along the first air path and the second air path at second ends of the first air path and the second air path respectively;
4) and calculating the gas flow according to the time difference of the received ultrasonic signals.
2. A method of ultrasonic gas flow measurement according to claim 1, wherein the first and second gas paths are parallel to each other.
3. A method of ultrasonic gas flow measurement according to claim 2, wherein the first and second gas paths are arranged adjacently.
4. An ultrasonic gas flow measuring device is characterized by comprising a first gas channel and a second gas channel which have the same cross section and the same length; the gas flow in the first gas channel and the second gas channel is opposite in flow direction; the first gas channel and the second gas channel are provided with connected ends, an ultrasonic transmitter is arranged at the connected end of the first gas channel and the second gas channel, and an ultrasonic signal sent by the ultrasonic transmitter is transmitted along the first gas channel and the second gas channel; and the other ends of the first gas channel and the second gas channel are provided with ultrasonic receivers, and the ultrasonic receivers are used for receiving ultrasonic signals transmitted along the first gas channel and the second gas channel.
5. An ultrasonic gas flow measurement device according to claim 4, wherein the first and second gas passages are connected at one end where they are connected by an elbow of set curvature.
6. An ultrasonic gas flow measurement device according to claim 5, wherein the first and second gas passages and the elbow form a U-shaped conduit.
7. An ultrasonic gas flow measurement device according to claim 5, wherein the first and second gas passages and the elbow form a V-shaped conduit.
8. An ultrasonic gas flow measurement device according to claim 6, wherein the first and second gas passages are parallel to each other.
9. An ultrasonic gas flow measurement device according to claim 8, wherein the first and second gas passages are disposed adjacent to each other.
10. An ultrasonic gas flow measuring device according to claim 9, wherein the first gas passage and the second gas passage are formed by providing a partition in one chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911194217.XA CN112857488A (en) | 2019-11-28 | 2019-11-28 | Ultrasonic gas flow measuring method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911194217.XA CN112857488A (en) | 2019-11-28 | 2019-11-28 | Ultrasonic gas flow measuring method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112857488A true CN112857488A (en) | 2021-05-28 |
Family
ID=75995808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911194217.XA Pending CN112857488A (en) | 2019-11-28 | 2019-11-28 | Ultrasonic gas flow measuring method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112857488A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308434A (en) * | 2022-08-04 | 2022-11-08 | 新开普电子股份有限公司 | Ultrasonic speed measurement method and system |
| CN115325969A (en) * | 2022-07-18 | 2022-11-11 | 鹏城实验室 | Curvature detection sensor |
| CN117470329A (en) * | 2023-12-26 | 2024-01-30 | 福建哈德仪表有限公司 | High-precision gas ultrasonic flowmeter |
| CN118465056A (en) * | 2024-07-12 | 2024-08-09 | 上海先普气体技术有限公司 | Gas concentration measuring device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020062681A1 (en) * | 2000-11-30 | 2002-05-30 | Livingston Richard A. | Oxygen sensor and flow meter device |
| JP2017075834A (en) * | 2015-10-14 | 2017-04-20 | 東京電力ホールディングス株式会社 | Flow rate measurement device and flow rate measurement method |
-
2019
- 2019-11-28 CN CN201911194217.XA patent/CN112857488A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020062681A1 (en) * | 2000-11-30 | 2002-05-30 | Livingston Richard A. | Oxygen sensor and flow meter device |
| JP2017075834A (en) * | 2015-10-14 | 2017-04-20 | 東京電力ホールディングス株式会社 | Flow rate measurement device and flow rate measurement method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115325969A (en) * | 2022-07-18 | 2022-11-11 | 鹏城实验室 | Curvature detection sensor |
| CN115325969B (en) * | 2022-07-18 | 2024-07-23 | 鹏城实验室 | Crookedness detection sensor |
| CN115308434A (en) * | 2022-08-04 | 2022-11-08 | 新开普电子股份有限公司 | Ultrasonic speed measurement method and system |
| CN115308434B (en) * | 2022-08-04 | 2024-09-06 | 新开普电子股份有限公司 | Ultrasonic speed measurement method and system |
| CN117470329A (en) * | 2023-12-26 | 2024-01-30 | 福建哈德仪表有限公司 | High-precision gas ultrasonic flowmeter |
| CN117470329B (en) * | 2023-12-26 | 2024-03-15 | 福建哈德仪表有限公司 | High-precision gas ultrasonic flowmeter |
| CN118465056A (en) * | 2024-07-12 | 2024-08-09 | 上海先普气体技术有限公司 | Gas concentration measuring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112857488A (en) | Ultrasonic gas flow measuring method and device | |
| CN102288780B (en) | Ultrasound measurement of the flow speed of a fluid in a conduit | |
| WO2008004560A1 (en) | Flow velocity measurement device and ultrasonic flow rate meter | |
| CN114088151B (en) | External clamping type multichannel ultrasonic flow detection device and detection method | |
| JP2001356034A (en) | Method and apparatus for ultrasonic flow measurement | |
| CN113702662B (en) | Multichannel synchronous emission flow velocity measurement device and method | |
| CN104236648A (en) | ultrasonic flowmeter | |
| CN201795821U (en) | Ultrasonic flowmeter | |
| CN102095889B (en) | Three-channel ultrasonic time difference method for measuring flow velocity | |
| CN114543909A (en) | Multi-channel reflection type ultrasonic flowmeter with built-in rectifier and flow calculation method | |
| AU2015249080A1 (en) | Apparatus and a method for providing a time measurement | |
| CN102023038B (en) | Ultrasonic measurement method for pipeline flux | |
| CN104596601A (en) | Ultrasonic flow meter sensor with eight sound channels | |
| CN106556440B (en) | Time difference method ultrasonic flowmeter | |
| CN206291930U (en) | A kind of ultrasonic wave mass flowmenter | |
| CN104655211A (en) | Ultrasonic measuring device | |
| JP2005091332A (en) | Ultrasonic flowmeter | |
| CN204359371U (en) | Eight-channel ultrasonic flowmeter sensor | |
| CN114660170A (en) | Fluid measuring device | |
| CN106768104A (en) | A kind of ultrasonic wave mass flowmenter | |
| CN207215202U (en) | A kind of ultrasonic flowmeter | |
| RU2422777C1 (en) | Ultrasonic procedure for measurement of flow rate of liquid and/or gaseous mediums and device for its implementation | |
| CN103765170A (en) | An ultrasonic measurement device and a method for operating the same | |
| CN116989858A (en) | Method for setting transducer group of combined ultrasonic water meter | |
| KR102631133B1 (en) | Device and method for ultrasonic gas meter flow measurement |
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 |