WO2008004560A1 - dispositif de mesure de vitesse d'écoulement et débitmètre ultrasonique - Google Patents

dispositif de mesure de vitesse d'écoulement et débitmètre ultrasonique Download PDF

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Publication number
WO2008004560A1
WO2008004560A1 PCT/JP2007/063326 JP2007063326W WO2008004560A1 WO 2008004560 A1 WO2008004560 A1 WO 2008004560A1 JP 2007063326 W JP2007063326 W JP 2007063326W WO 2008004560 A1 WO2008004560 A1 WO 2008004560A1
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Prior art keywords
pipe
flow velocity
measurement
line
transmitter
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PCT/JP2007/063326
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English (en)
Japanese (ja)
Inventor
Yasushi Takeda
Original Assignee
Yasushi Takeda
Priority date (The priority date 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 date listed.)
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Application filed by Yasushi Takeda filed Critical Yasushi Takeda
Priority to JP2008523695A priority Critical patent/JP5122453B2/ja
Publication of WO2008004560A1 publication Critical patent/WO2008004560A1/fr

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    • 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
    • G01F1/665—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 of the drag-type

Definitions

  • the present invention relates to a flow velocity distribution measuring apparatus suitable for measuring a flow velocity distribution of a fluid to be measured flowing through a pipe, particularly a gas fluid, using an ultrasonic wave, and an ultrasonic flowmeter using the same.
  • the Doppler type ultrasonic flow meter disclosed in Patent Document 1 is configured so that the ultrasonic transducer 101 is flowed in the flow direction of the fluid 103 to be measured by an angle oc with respect to the diameter direction of the fluid pipe 102. Tilt to the position.
  • a reflector such as bubbles or foreign matters uniformly distributed in the fluid 103 to be measured on the measurement line ML, and is shown in Fig.
  • the reflected echo a is incident on the ultrasonic transducer 101.
  • symbol b is a multiple reflection echo reflected on the tube wall on the ultrasonic pulse incident side
  • symbol c is a multiple reflection echo reflected on the opposite tube wall.
  • the transmission interval of the ultrasonic pulse transmitted from the ultrasonic transducer 101 is lZFrpf.
  • the Doppler shift method when an ultrasonic pulse is radiated into the fluid 103 to be measured flowing in the fluid pipe 102, the ultrasonic wave is reflected in the fluid 103 to be measured by a mixed or uniformly distributed reflector.
  • the change in the flow velocity is measured from the fundamental frequency of the ultrasonic pulse incident on the fluid 103 to be measured and the frequency of the ultrasonic echo that has undergone Doppler shift, and the flow velocity distribution in the measurement region along the measurement line ML is calculated.
  • Distribution can be measured.
  • the Doppler type ultrasonic flowmeter can determine the flow velocity distribution in the measurement region instantaneously in a time-dependent manner, so that the flow rate of the fluid 103 to be measured can be accurately measured regardless of whether it is steady or unsteady. You can often ask.
  • Patent Document 1 JP 2003-130699 A
  • the Doppler type ultrasonic flowmeter needs to uniformly distribute (mix) the reflector that reflects the incident ultrasonic pulse in the measured fluid, the measured fluid is a gaseous fluid. If this is the case, the problem was that the flow velocity distribution could not be measured accurately.
  • the present invention has been made in view of the points to be applied, and even when the fluid to be measured flowing in the fluid piping is a gas fluid, the flow velocity distribution measuring apparatus capable of accurately measuring the flow velocity distribution and An object is to provide an ultrasonic flow meter.
  • the flow velocity distribution measuring apparatus of the present invention includes a transmitter installed on a pipe wall of a fluid pipe to generate an ultrasonic pulse and entering the fluid to be measured flowing in the fluid pipe, and the transmitter in the fluid pipe.
  • a plurality of receivers that are two-dimensionally installed on the tube wall opposite to each other and output detection signals having an amplitude corresponding to the received ultrasonic intensity, and detecting a plurality of receivers arranged in the tube axis direction among the receivers Signal force
  • the amount of displacement of the ultrasonic pulse in the tube axis direction is detected, and the angle between the outgoing end force of the transmitter and the line passing through the outgoing end and the center of the pipe is taken as the opening angle, and the transmitter
  • the displacement force detected for each of the two measurement lines with slightly different opening angles is also determined by the perpendicular from the center of the pipe to the two measurement lines.
  • a means to measure the flow velocity at the position It is characterized by comprising.
  • the displacement force detected for each of the two measurement lines having slightly different opening angles, the flow velocity at a predetermined position determined by the perpendicular from the pipe center to the two measurement lines is obtained. Even when the measurement fluid is a gaseous fluid, it is possible to accurately measure the flow velocity distribution without uniformly distributing (mixing) the reflector in the fluid to be measured.
  • the flow velocity distribution measuring apparatus of the present invention is arranged in a line along the pipe axis direction on the pipe wall of the fluid pipe.
  • a plurality of transmitters that are installed to generate ultrasonic pulses and enter the fluid to be measured flowing in the fluid pipe from different positions in the pipe axis direction, and a pipe wall facing the transmitter along the pipe circumferential direction
  • a plurality of receivers that are installed in a row and each output a detection signal having an amplitude corresponding to the received ultrasonic intensity, a maximum peak value of the detection signal for each of the receivers, and a receiver that indicates the maximum peak value
  • a displacement amount in the tube axis direction of the ultrasonic pulse is detected from the relative relationship with the transmitter position where the ultrasonic pulse is emitted at that time, and a line passing through the emission end and the pipe center as seen from the emission end of the transmitter.
  • the opening angle is determined based on the relative relationship between the transmitters arranged in a line along the pipe axis direction and the receivers arranged in a line along the pipe circumferential direction on the opposite side of the pipe. Since the displacement amount is calculated using two slightly different measurement lines, the total number of transmitters and receivers can be reduced.
  • the flow velocity distribution measuring apparatus of the present invention is disposed on the pipe wall of the fluid pipe, generates an ultrasonic pulse, and enters the measured fluid flowing in the fluid pipe, and faces the transmitter.
  • a plurality of receivers arranged in a line along the tube circumferential direction at a predetermined position in the tube axis direction of the tube wall, each outputting a detection signal having an amplitude corresponding to the received ultrasonic intensity, and detection of each of the receivers
  • the time of flight until the ultrasonic pulse emitted from the transmitter reaches each receiver is detected from the signal, and is formed by a line segment passing through the output end and the pipe center as viewed from the output end of the transmitter.
  • the time-of-flight force of the ultrasonic pulse detected for two measurement lines with slightly different opening angles can be obtained as the flow velocity at a predetermined position determined by the perpendicular to the two measurement lines. Even if the fluid to be measured is a gaseous fluid, the reflector is measured Accurate measurement of flow velocity distribution without uniform distribution (mixed) in the fluid
  • An ultrasonic flowmeter includes the flow velocity distribution measuring device, and measures a flow rate of a fluid to be measured flowing in the pipe based on a flow velocity distribution measured by the flow velocity distribution measuring device.
  • the flow velocity distribution can be accurately measured using ultrasonic waves.
  • FIG. 1 A diagram showing a state in which an ultrasonic pulse having a divergence angle is irradiated.
  • FIG.2 Diagram showing the state of ultrasonic pulses displaced
  • FIG.3 Diagram showing the beam axis tilted at an angle ( ⁇ ) in the tube axis direction
  • FIG. 4 A diagram showing a state in which an ultrasonic beam is launched with a diametric force angle ⁇ opened
  • FIG. 5 A diagram showing two measurement lines with different opening angles
  • FIG. 7 is an overall configuration diagram of the ultrasonic flowmeter according to the first embodiment.
  • FIG. 8 is a diagram showing an arrangement state of receiving transducers in the first embodiment.
  • FIG. 9 (a) Vertical sectional view of the pipe in the first embodiment, (b) Cross sectional view in the pipe axis direction of the pipe in the first embodiment.
  • FIG. 11 Overall configuration diagram of ultrasonic flowmeter according to embodiment 2.
  • FIG. 12 is an overall configuration diagram of the ultrasonic flowmeter according to the third embodiment.
  • FIG. 13 is a diagram showing an arrangement state of a transmitting transducer and a receiving transducer in the third embodiment.
  • FIG. 14 (a) Vertical sectional view of the pipe in the third embodiment, (b) Cross section in the pipe axis direction of the pipe in the third embodiment.
  • FIG. 15 (a) The pipe showing the receiving transducer in the pipe circumferential direction in the second measurement principle. Vertical cross-sectional view, (b) Pipe cross-sectional view in the pipe axis direction showing the receiving transducer in the pipe axis direction in the second measurement principle
  • FIG. 16 is a diagram for explaining the measurement principle of a conventional Doppler type ultrasonic flowmeter
  • an ultrasonic pulse is emitted from an ultrasonic transducer 11 serving as a transmitter installed on a pipe wall of a pipe 10 having a circular pipe force toward an opposite pipe wall.
  • the ultrasonic pulse is fired with an appropriate divergence angle with respect to the transducer axis.
  • the movement (displacement) of the ultrasonic pulse in the cross section in the tube axis direction will be described.
  • the emitted ultrasonic pulse goes straight in the firing direction (hereinafter referred to as the "beam axis"), and the opposite pipe wall of the pipe 10 To reach.
  • the emitted ultrasonic pulse is displaced downstream as indicated by W1 in the figure due to the flow of the gaseous fluid.
  • the displacement amount at this time includes the flow velocity information.
  • m (r) is the local Mach number, which is the velocity distribution V (r) divided by the speed of sound c. From the assumption of axial symmetry, it is a function of only the radial position.
  • D represents the diameter of the pipe
  • coordinate X represents the position on the beam axis with the head position of the ultrasonic transducer 11 as the origin (in this case, the position on the diameter of pipe 10).
  • the beam axis passes through the diameter of the pipe 10 and is at an angle in the tube axis direction (
  • ⁇ is a coordinate axis taken in the beam axis direction
  • L is a path length in the pipe 10.
  • the path length L is obtained by the following equation.
  • FIG. 5 shows two measurement lines (1, 2) with different opening angles ⁇ .
  • the amount of displacement of the ultrasonic beam at each measurement line 1 and 2 is as follows.
  • Equation 7 the first term is determined by the position of the measurement lines 1 and 2 set arbitrarily and is constant. Consider the integral difference of the second term in (Equation 7).
  • the flow velocity distribution is a function of only the radial position, so the integration on the beam axis is integral in the tube radial direction, twice the integration range from position h to radius R. equal.
  • the difference in displacement is equal to the integration of the flow velocity distribution between the two measurement lines 1 and 2 and the center distances hi and h2.
  • the distances hi and h2 are the distances from the center of the pipe to the intersection of the perpendicular lines drawn on the two measurement lines 1 and 2. Note that distance and position are synonymous because axial symmetry is assumed.
  • Equation 7 The force that can be assumed to be 12 (Equation 7) can be transformed as follows.
  • the flow velocity at hi, h2] is obtained as follows.
  • FIG. 7 is an overall configuration diagram of the ultrasonic flowmeter according to the first embodiment.
  • One transmitting transducer 11 is installed on one side of the tube wall of the pipe 10 that forms a circular pipe through which the fluid G to be measured flows, and an ultrasonic noise is placed on the opposite tube wall of the pipe 10.
  • a receiving transducer array comprising a plurality of receiving transducers 12 serving as receivers for receiving the signal is installed.
  • the transmitting transducer 11 is installed perpendicularly to the pipe wall outside or inside the pipe, and the center of the ultrasonic beam passes through the pipe center and faces the opposite pipe. Set the installation angle so that it is perpendicular to the wall.
  • the effective diameter of the transmitting transducer 11 is determined in consideration of the spread of the ultrasonic beam.
  • FIG. 8 and 9 (a) and 9 (b) are diagrams showing the arrangement state of the receiving transducer array.
  • the receiving transducer array is composed of a plurality of receiving transducers 12 arranged in a two-dimensional manner (planar) with reference to the position facing the transmitting transducer 11 correctly.
  • the receiving transducers 12 on both sides in the tube axis direction of the receiving transducer array are omitted.
  • the interval between the receiving transducers 12 constituting the receiving transducer array is selected so that the opening angle a of the beam axis of the ultrasonic beam is as small as possible.
  • the arrangement range of the receiving transducer in the tube axis direction shall be at least the radius of pipe 10.
  • the signal oscillator 13 outputs a transmission signal S1 to be supplied to the transmission transducer 11.
  • the fundamental frequency of the transmitted signal in the signal oscillator 13 is determined in consideration of the characteristics of the pipe wall material, the fluid to be measured, the spread of the ultrasonic pulse, and the like.
  • the signal waveform of the transmission signal is an acute triangular pulse signal, which is the same as the waveform used for the normal time difference method.
  • the repetition period f of the pulse signal is determined from the gas sound velocity, pipe diameter, average flow velocity, and so on. Pulse signal
  • the firing timing signal S2 is sent to the receiving side as a synchronization signal.
  • a detection circuit 14 is connected to the output terminal of each receiving transducer 12.
  • the detection circuit 14 includes a signal amplifier that amplifies a detection signal having a magnitude corresponding to the incident ultrasonic intensity output from the connected receiving transducer 12, and a peak detection circuit that reads a peak value of the signal amplifier output. Become. Since these detection circuits 14 obtain the flow velocity at a fast sampling rate, the outputs of the receiving transducers 12 are detected simultaneously.
  • Each detection circuit 14 has a pulse reception timing set by a timing signal S2 supplied from the signal oscillator 13.
  • the data acquisition circuit 15 includes a digital multiplexer that collects all peak values read by the detection circuits 14. Which detection in the data acquisition circuit 15 Decide whether to get as much information as the circuit.
  • the installation position of each detection circuit 14 can be converted into the opening angle (() of the measurement line and the position in the tube axis direction from the relationship with the corresponding receiving transducer 12.
  • Information on the installation position of the detection circuit 14 (or the installation position of the reception transducer 12) where the maximum peak value is detected among the plurality of reception transducers 12 arranged in the tube axis direction is output as a displacement amount detection signal.
  • the data processing device 20 includes a flow velocity distribution measuring circuit 21 that measures the flow velocity distribution as well as the displacement detection signal force output from the data acquisition circuit 15, and the flow velocity distribution data force measured by the flow velocity distribution measuring circuit 21 in the pipe 10.
  • a flow rate measurement circuit 22 that calculates the flow rate of the fluid to be measured flowing through and a display unit 23 that displays and outputs the measurement result.
  • the flow velocity distribution measurement circuit 21 calculates the average flow velocity m by performing data calculation based on the above-mentioned (Equation 11), the displacement force of two measurement lines with slightly different opening angles ⁇ .
  • a measurement trigger for instructing the signal oscillator 13 to start measurement is given.
  • the signal oscillator 13 applies a transmission signal S1 having a fundamental frequency to the transmission transducer 11 in response to a measurement trigger, and supplies a timing signal S2 to each detection circuit 14.
  • the transmission transducer 11 converts the transmission signal S1 into an ultrasonic pulse and enters the measured fluid G in the pipe 10. As shown in FIGS. 1 and 7, the ultrasonic pulse incident on the fluid G to be measured becomes an ultrasonic beam having a predetermined spread centered on the beam axis, and a receiving transducer array installed on the opposite tube wall. Is incident on. Each of the receiving transducers 12 constituting the receiving transducer array outputs a detection signal having an amplitude corresponding to the incident ultrasonic intensity.
  • All the detection circuits 14 use the timing signal S2 synchronized with the ultrasonic pulse emission time as a trigger, and determine the peak value of the detection signal output from each receiving transducer 12 that has received the first arrival wave. To detect.
  • the data acquisition circuit 15 takes in the peak value at each position (i, j) from all the detection circuits 14.
  • the spatial characteristics of the ultrasonic noise incident on the receiving transducer array will be described.
  • the spatial characteristics of the emitted ultrasonic pulse are centered on the beam axis. It has a Gaussian distribution shape.
  • the distribution in the tube axis direction has a substantially similar Gaussian distribution in terms of the opening angle.
  • Fig. 9 (b) shows the receiving transducer array in the tube axis direction where the ultrasonic beam of (a) is incident.
  • the detection signal output from the receiving transducer 12 installed at the position of the beam axis position force distance Zn
  • the peak value is the maximum value in the receiving transducer train shown in Fig. 9 (b). This distance Zn corresponds to the displacement Zi (0) in (Equation 5) or (Equation 6).
  • the data acquisition circuit 15 corresponds to each opening angle a of the ultrasonic beam axis, and the transducer array for reception in the tube axis direction shown in FIG.
  • the selected position is transmitted to the data processor 20 as the displacement Z from the original beam axis at the opening angle a.
  • the average flow velocity m force at each position in the different pipe diameter directions is also obtained as the flow velocity distribution v (r) in the pipe 10.
  • the flow rate measurement circuit 22 calculates the average flow rate in the pipe 10 based on the flow velocity distribution v (r) in the pipe 10 obtained by the flow velocity distribution measurement circuit 21 and outputs the average flow rate to the display unit 23.
  • the fluid G to be measured is a gaseous fluid such as a gas that does not include a reflector or is contained non-uniformly
  • the flow velocity is measured using ultrasonic waves. Distribution can be measured, and flow measurement with high accuracy becomes possible.
  • the transducer axis of the transmitting transducer 11 that emits the ultrasonic pulse is set perpendicular to the tube axis direction, and the amount of displacement of the ultrasonic pulse is determined by the receiving transducer provided on the opposite tube wall. Since it is configured to directly detect the flow velocity at a predetermined position on the vertical section of the pipe, it is possible to reduce the calibration work of the measurement value required for the conventional Doppler type ultrasonic flowmeter.
  • FIG. 11 is an overall configuration diagram of the ultrasonic flowmeter according to the second embodiment.
  • the arrangement of the transmitting transducer 11 and the receiving transducer 12 is the same as in the first embodiment.
  • the analog multiplexer 31 is connected to the output end of the receiving transducer 12, thereby reducing the number of M ⁇ N detection circuits 14 required in the first embodiment!
  • the analog multiplexer 31 operates to selectively input the detection signal from each receiving transducer 12 to the data acquisition circuit 32 at the subsequent stage.
  • the data acquisition circuit 32 is configured to include AD changes.
  • the peak value is detected from the detection signal converted into a digital signal by the AD conversion, and the receiving transducer 12 from which the information is obtained is determined, and the receiving transducer position of the maximum peak value is determined.
  • Information is output as a displacement detection signal.
  • a timing signal S2 for emitting a pulse signal is supplied to the data acquisition circuit 32 and used for sampling timing in AD conversion.
  • the ultrasonic flow meter configured as described above, detection from the receiving transducer 12 is performed. Signals are input to the data acquisition circuit 32 one by one via the analog multiplexer 31, and the peak value is detected. Each receiving transducer array force aligned in the tube axis direction detects the maximum peak value, and outputs position information (i, j) indicating the maximum peak value for each receiving transducer array to the flow velocity distribution measurement circuit 21 as displacement information. To do. The flow velocity distribution measurement circuit 21 calculates the average flow velocity m by substituting the displacement into (Equation 11).
  • the detection circuit 14 is reduced.
  • the circuit configuration can be simplified.
  • the detection signals of MXN reception transducers 12 are processed one by one, so that time is required as compared with the first embodiment, but the variation is small. Effective for measurement fluid G.
  • FIG. 12 is an overall configuration diagram of the ultrasonic flowmeter according to the third embodiment of the present invention.
  • One pipe wall of the pipe 10 is formed with a transmitting transducer array composed of a plurality of transmitting transducers 40 arranged in a line along the pipe axis direction.
  • a receiving transducer array composed of a plurality of receiving transducers 41 arranged in a line along the pipe circumferential direction at a predetermined position H in the direction is formed.
  • FIGS. 13 and 14 (a) and 14 (b) show the positional relationship between the transmitting transducer 40 and the receiving transducer 41.
  • FIG. FIG. 13 is an external view of the pipe 10, and a receiving transducer 41 indicated by a broken line is installed on the pipe wall opposite to the installation position of the transmitting transducer 40.
  • 14 (a) is a vertical sectional view with respect to the tube axis of the pipe 10, and
  • FIG. 14 (b) is a sectional view along the tube axis direction at the position of the transmitting transducer 40.
  • the receiving transducer 41 is continuously installed in the pipe circumferential direction.
  • the transducer array for reception is formed in the range of about 90 degrees when viewed from the center of the pipe.
  • a receiving transducer 41 is installed in the pipe circumferential direction.
  • the signal oscillator 42 generates a transmission signal S1 having a desired fundamental frequency for generating an ultrasonic pulse. Further, the transmitting transducer 40 supplies the timing signal S2 to the timing controller 45 described later in synchronization with the output of the transmitting signal S1.
  • each transmitting transducer 40 is installed perpendicular to the pipe wall outside or inside the pipe, and the center of the ultrasonic beam passes through the pipe center and is perpendicular to the opposite pipe wall. Set the installation angle so that it is incident on the. In addition, the effective diameter of the transmitting transducer 40 is reduced so that the directivity is as wide as possible.
  • the output terminals of all receiving transducers 41 installed in the pipe circumferential direction are connected to the receiving multiplexer 44.
  • the reception multiplexer 44 sequentially selects the detection signals output from the reception transducers 41 and outputs them to the data acquisition circuit 46.
  • the operation timing of the transmission multiplexer 43 and the reception multiplexer 44 is controlled by a timing controller 45.
  • the timing controller 45 controls the switching operation timing of the transmission multiplexer 43 and the reception multiplexer 44 using the timing signal S2 given from the signal oscillator 42 as a trigger. Specifically, when one transmission transducer 40 is selected by the transmission multiplexer 43, the transmission transducer 40 to be applied is not switched until the detection signal sampling is completed for all the reception transducers 41. Control as follows. When the sampling of the detection signals for all the receiving transducers 41 is completed, the next transmitting transducer 40 is selected by the transmitting multiplexer 43, and until the sampling of the detection signals for all the receiving transducers 41 is completed again. The transmitter 40 is controlled so as not to be switched. Such timing control is executed for all the transmission multiplexers 43.
  • the data acquisition circuit 46 is configured to include AD conversion. In data acquisition circuit 46 Detects the peak value from the detection signal converted into a digital signal by AD conversion, and stores the detected peak value in association with the transmitting transducer 40 selected by the transmitting multiplexer 43 at that time. To do.
  • the timing for switching the transmitting transducer 40 is given from the timing controller 45. For all the transmitting transducers 40, after acquiring information (peak values) regarding the ultrasonic reception intensity in the tube circumferential direction, the transmitting transducers 40 (in the tube axis direction) showing the maximum peak value at each opening angle (a).
  • the position information of the transmitting transducer 40 showing the maximum peak value is output as a displacement amount detection signal.
  • the displacement amount detection signal is output to the data processing device 20, but since it has the same configuration and function as those of the first and second embodiments, description thereof will be omitted.
  • the transmission signal S 1 is supplied from the signal oscillator 52 to the transmission multiplexer 43 and simultaneously the timing signal S 2 is supplied to the timing controller 45.
  • the timing controller 45 controls the transmitting multiplexer 43 so as to select the first transmitting transducer 40, and also controls the receiving multiplexer 44 so as to select the detection signal in order from the first receiving transducer 41. To do. Then, every time the reception multiplexer 44 finishes sampling the detection signals for all the reception transducers 41, the timing controller 45 switches the transmission transducer 40 to which the transmission signal S1 is applied.
  • the peak values of all the receiving transducers 41 are stored in correspondence with the respective transmitting transducers 40 (position information).
  • the data acquisition circuit 46 has a plurality of receiving positions with different launch angles (a) with respect to each launch position (position in the tube axis direction) of the ultrasonic beam shifted in the tube axis direction and each launch position.
  • the peak value of the ultrasonic reception intensity indicated by the transducer 41 is stored in association with each other.
  • the displacement amount in the tube axis direction is obtained by detecting the maximum peak values of a plurality of receiving transducers arranged in the tube axis direction.
  • the emission position of the ultrasonic beam (the position of the transmitting transducer 40 in the tube axis direction) is shifted, thereby making the relative
  • information equivalent to those in the first and second embodiments is obtained.
  • the data acquisition circuit 46 corresponds to each receiving transducer 41 to each launch position. Since the peak value at each position is stored, the launch position having the maximum peak value is specified from among the peak values. If the beam axis B shown in Fig. 12 is the reference position in the tube axis direction, the launch position showing the maximum peak value corresponds to the displacement of the ultrasonic beam. The data acquisition circuit 46 specifies the maximum peak value for all receiving transducers 41 with different opening angles), and sets the launch position showing the maximum peak value as the amount of displacement from the reference position in the tube axis direction. And output to the data processor 20 as a displacement detection signal.
  • the flow velocity distribution measurement circuit 21 assigns the displacement amount of the predetermined measurement lines 1 and 2 to (Equation 11) and calculates the average at each position. The flow velocity is obtained, and the flow meter measurement circuit 22 calculates the gas flow rate as well as the flow velocity distribution force in the vertical section of the pipe.
  • a line of transmitting transducers 40 is provided on the transmitting side in the tube axis direction, and a line of receiving transducers 41 is provided on the receiving side in the pipe circumferential direction. Since the amount of displacement of the ultrasonic beam can be detected, the number of transducers can be reduced compared to the first embodiment.
  • the displacement amount of the ultrasonic beam is used to directly determine the flow velocity distribution shape.
  • the flow velocity distribution shape is directly determined using the flight time of the ultrasonic pulse. You can also.
  • the second measurement principle for directly obtaining the flow velocity distribution shape using the time of flight of the ultrasonic pulse will be explained.
  • the fluid flowing in the pipe is assumed to be axisymmetric.
  • FIGS. 15 (a) and 15 (b) a receiving transducer arrangement as shown in FIGS. 15 (a) and 15 (b). That is, one transmitting transducer 50 is installed on one tube wall of the pipe 10 so that the beam axis is perpendicular to the tube wall, and a receiving transducer 51 is installed on the other opposite tube wall in the tube axis direction. It is assumed that one row is provided at position H in the pipe circumferential direction. The installation position in the tube axis direction of the receiving transducer 51 provided along the tube circumferential direction is such that the beam axis position force perpendicular to the tube wall is at a distance H in the tube axis direction as shown in Fig. 15 (b). Is provided.
  • T PZc.
  • This integrand with path length P can be approximated by using the fact that the local Mach number is 1 in the square root as follows.
  • the tilt angle 0 to the beam axis B is the beam launch angle necessary to reach the detection position, it is unknown at this stage.
  • the amount of displacement in this form is H, but the launch angle of the nozzle that reaches it can be obtained by reversing the following force.
  • Embodiment 4 in which the second measurement principle is applied to an ultrasonic flowmeter will be described. Since the ultrasonic flowmeter according to the fourth embodiment has substantially the same overall configuration as the ultrasonic flowmeter of the first embodiment (FIG. 7), the parts different from the first embodiment with reference to FIG. Mainly explained.
  • the arrangement of receiving transducers is different from that in the first embodiment.
  • one transmission transducer 50 is installed on one tube wall of the pipe 10 so that the beam axis is perpendicular to the tube wall, and the other tube facing the other. Only one row of receiving transducers 51 is provided on the wall in the tube circumferential direction at a position H in the tube axis direction.
  • each detection circuit 14 is connected to the output end of each receiving transducer 51 arranged in one line in the pipe circumferential direction.
  • Each detection circuit 14 includes a signal amplifier that amplifies a detection signal having a magnitude corresponding to the incident ultrasonic intensity output from the connected reception transducer 51, and a flight time T (transmission signal) from the signal amplifier output.
  • the delay time detection circuit detects the delay time from the S1 output timing.
  • the delay time detection circuit detects the flight time T until the ultrasonic pulse emitted from the transmitting transducer 50 reaches each receiving transducer 51 using the timing signal S1 input from the signal transmitter 13 as a reference time.
  • the flow velocity distribution measurement circuit 21 sets two measurement lines 1, 2 (Fig. 5) in the immediate vicinity, and the flight obtained from the output of the receiving transducer 51 corresponding to the two measurement lines 1, 2 Time T, T
  • the flow velocity distribution shape and flow rate can be obtained directly using the time of flight of ultrasonic pulses, and the number of receiving transducers that are difficult to install can be reduced. Is also possible.
  • the data acquisition circuit 32 detects the flight time T until the sound wave pulse reaches each receiving transducer 51, and the flow velocity distribution measurement circuit 21 determines that (Equation 14) and (Equation 15) Substituting flight times T and T to find the average flow velocity m at position [h, h]
  • the present invention is applicable to a flow velocity distribution measuring device and a flow meter of a gaseous fluid flowing in a pipe.

Abstract

L'invention concerne un dispositif de mesure de vitesse d'écoulement permettant de mesurer avec précision en utilisant une impulsion ultrasonique la distribution de la vitesse d'écoulement d'un gaz s'écoulant dans une tuyauterie de fluide. Une impulsion ultrasonique est amenée à passer d'un transducteur de transmission (11), placé sur une paroi de la tuyauterie de fluide (10), dans un fluide cible (G) s'écoulant dans la tuyauterie de fluide (10), et l'impulsion ultrasonique est détectée par des transducteurs de réception (12) disposés en deux dimensions sur la paroi opposée dans la tuyauterie de fluide (10). La quantité de déplacement, par rapport à la direction axiale de la tuyauterie, de l'impulsion ultrasonique est détectée à partir de signaux reçus par les transducteurs de réception parmi les transducteurs de réception (12) qui sont disposés dans la direction axiale de la tuyauterie. Deux lignes de mesure (1, 2) présentant des angles d'ouverture α légèrement différents les uns des autres sont définies, et les vitesses d'écoulement en des positions prédéterminées [h1, h2] sont chacune obtenues à partir d'une différence de quantités de déplacements et de temps de parcours détectée pour chaque ligne de mesure (1, 2).
PCT/JP2007/063326 2006-07-04 2007-07-03 dispositif de mesure de vitesse d'écoulement et débitmètre ultrasonique WO2008004560A1 (fr)

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JP2006183990 2006-07-04

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Cited By (26)

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KR101080711B1 (ko) 2010-08-20 2011-11-10 한국건설기술연구원 하천 연직 유속분포 측정 장치 및 방법
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US11135360B1 (en) 2020-12-07 2021-10-05 Icu Medical, Inc. Concurrent infusion with common line auto flush
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US8857269B2 (en) 2010-08-05 2014-10-14 Hospira, Inc. Method of varying the flow rate of fluid from a medical pump and hybrid sensor system performing the same
WO2012023668A1 (fr) * 2010-08-20 2012-02-23 한국건설기술연구원 Dispositif et procédé pour la mesure la distribution des vitesses verticales d'un fleuve
KR101080711B1 (ko) 2010-08-20 2011-11-10 한국건설기술연구원 하천 연직 유속분포 측정 장치 및 방법
JP2014507667A (ja) * 2011-03-07 2014-03-27 フレクシム フレクシブレ インドゥストリーメステヒニーク ゲーエムベーハー 超音波クランプオン式流量測定のための方法及び該方法を実行するための装置
US11599854B2 (en) 2011-08-19 2023-03-07 Icu Medical, Inc. Systems and methods for a graphical interface including a graphical representation of medical data
US11004035B2 (en) 2011-08-19 2021-05-11 Icu Medical, Inc. Systems and methods for a graphical interface including a graphical representation of medical data
US10430761B2 (en) 2011-08-19 2019-10-01 Icu Medical, Inc. Systems and methods for a graphical interface including a graphical representation of medical data
US10022498B2 (en) 2011-12-16 2018-07-17 Icu Medical, Inc. System for monitoring and delivering medication to a patient and method of using the same to minimize the risks associated with automated therapy
US11376361B2 (en) 2011-12-16 2022-07-05 Icu Medical, Inc. System for monitoring and delivering medication to a patient and method of using the same to minimize the risks associated with automated therapy
US11933650B2 (en) 2012-03-30 2024-03-19 Icu Medical, Inc. Air detection system and method for detecting air in a pump of an infusion system
US10578474B2 (en) 2012-03-30 2020-03-03 Icu Medical, Inc. Air detection system and method for detecting air in a pump of an infusion system
US11623042B2 (en) 2012-07-31 2023-04-11 Icu Medical, Inc. Patient care system for critical medications
US10463788B2 (en) 2012-07-31 2019-11-05 Icu Medical, Inc. Patient care system for critical medications
US10874793B2 (en) 2013-05-24 2020-12-29 Icu Medical, Inc. Multi-sensor infusion system for detecting air or an occlusion in the infusion system
US11433177B2 (en) 2013-05-29 2022-09-06 Icu Medical, Inc. Infusion system which utilizes one or more sensors and additional information to make an air determination regarding the infusion system
US10596316B2 (en) 2013-05-29 2020-03-24 Icu Medical, Inc. Infusion system and method of use which prevents over-saturation of an analog-to-digital converter
US10166328B2 (en) 2013-05-29 2019-01-01 Icu Medical, Inc. Infusion system which utilizes one or more sensors and additional information to make an air determination regarding the infusion system
US11596737B2 (en) 2013-05-29 2023-03-07 Icu Medical, Inc. Infusion system and method of use which prevents over-saturation of an analog-to-digital converter
US10342917B2 (en) 2014-02-28 2019-07-09 Icu Medical, Inc. Infusion system and method which utilizes dual wavelength optical air-in-line detection
US11344673B2 (en) 2014-05-29 2022-05-31 Icu Medical, Inc. Infusion system and pump with configurable closed loop delivery rate catch-up
US11344668B2 (en) 2014-12-19 2022-05-31 Icu Medical, Inc. Infusion system with concurrent TPN/insulin infusion
US10850024B2 (en) 2015-03-02 2020-12-01 Icu Medical, Inc. Infusion system, device, and method having advanced infusion features
JP2017075834A (ja) * 2015-10-14 2017-04-20 東京電力ホールディングス株式会社 流量計測装置および流量計測方法
US11246985B2 (en) 2016-05-13 2022-02-15 Icu Medical, Inc. Infusion pump system and method with common line auto flush
US11324888B2 (en) 2016-06-10 2022-05-10 Icu Medical, Inc. Acoustic flow sensor for continuous medication flow measurements and feedback control of infusion
US11280648B2 (en) 2017-11-14 2022-03-22 Flowbiz Research Inc. Ultrasonic flow-rate measurement device and ultrasonic flow-rate measurement method
JP6321316B1 (ja) * 2017-11-14 2018-05-09 有限会社フロウビズ・リサーチ 超音波流量測定装置及び超音波流量測定方法
WO2019097570A1 (fr) * 2017-11-14 2019-05-23 有限会社フロウビズ・リサーチ Dispositif de mesure de débit ultrasonore et procédé de mesure de quantité d'écoulement ultrasonore
US10656894B2 (en) 2017-12-27 2020-05-19 Icu Medical, Inc. Synchronized display of screen content on networked devices
US11029911B2 (en) 2017-12-27 2021-06-08 Icu Medical, Inc. Synchronized display of screen content on networked devices
US11868161B2 (en) 2017-12-27 2024-01-09 Icu Medical, Inc. Synchronized display of screen content on networked devices
JP2019090777A (ja) * 2018-02-22 2019-06-13 有限会社フロウビズ・リサーチ 超音波流量測定装置及び超音波流量測定方法
CN108593959A (zh) * 2018-06-12 2018-09-28 南京海普水文科技有限公司 一种基于adcp系统的发射检测电路
US11278671B2 (en) 2019-12-04 2022-03-22 Icu Medical, Inc. Infusion pump with safety sequence keypad
US11883361B2 (en) 2020-07-21 2024-01-30 Icu Medical, Inc. Fluid transfer devices and methods of use
US11135360B1 (en) 2020-12-07 2021-10-05 Icu Medical, Inc. Concurrent infusion with common line auto flush
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