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Ultrasonic flowmeter and ultrasonic flow rate measurement method

A flow measurement and ultrasonic technology, applied in the field of ultrasonic flowmeters, can solve the problems of reducing measurement accuracy and achieve the effects of improving measurement accuracy, low cost, and reducing production and installation costs

Active Publication Date: 2007-03-07
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0032] As described so far, since the conventional method of measuring the flow rate using a single measuring instrument using the pulse Doppler method or the transit time method faces the technical problem of lowering the measurement accuracy, or changes depending on the velocity of the fluid that is the object of measurement or conditions such as including air bubbles Cannot be measured, both pulse Doppler and transit time methods have advantages and disadvantages

Method used

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  • Ultrasonic flowmeter and ultrasonic flow rate measurement method
  • Ultrasonic flowmeter and ultrasonic flow rate measurement method
  • Ultrasonic flowmeter and ultrasonic flow rate measurement method

Examples

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no. 1 example

[0082] FIG. 3 is a conceptual diagram illustrating an ultrasonic flow meter including an ultrasonic flow meter for performing an ultrasonic flow measurement method according to an embodiment of the present invention.

[0083] The ultrasonic flowmeter according to the present embodiment installed on a pipe 50 in which a fluid 51 to be measured flows includes a plurality of detectors 41, 42, and 43 (ie, sensor units) including piezoelectric elements and the like, each detecting The transmitter acts as an ultrasonic transmitter & receiver. That is, each of the detectors 41, 42 and 43 includes a piezoelectric element 40a for performing mutual conversion between an acoustic signal such as ultrasonic oscillation and an electric signal, and a wedge 40b positioned on the wedge 40b and the outer wall surface of the pipe 50 In between, it is used to send the ultrasonic oscillation generated by the piezoelectric element 40a into the pipe 50 at a predetermined incident angle, so as to sen...

no. 2 example

[0098] FIG. 4 is a conceptual diagram illustrating an ultrasonic flowmeter according to another embodiment of the present invention. The outline shown in FIG. 4 exemplifies placing the detector changeover switch 35 at the front stage of the received signal amplification control unit 21 included in the pulse Doppler method unit 20, and the pulse Doppler in the outline described in FIG. 3 The case where the Le method unit 20 shares a pair of the detector 41 (ie, the first sensor unit) and the detector 42 (the second sensor unit).

[0099] That is, the exemplary scheme shown in FIG. 4 shares one of the detector pairs 41 and 42 used by the transit time method unit 10 by connecting the detector pair to the pulse Doppler method unit 20 through the detector changeover switch 35. As a result of one or two, the detector 43 dedicated to the pulse Doppler method unit 20 is eliminated, and the number of detectors can be reduced from three to two as shown in FIG. 3 .

[0100] There are tw...

no. 3 example

[0108] FIG. 6 is a block diagram illustrating an outline of an ultrasonic flowmeter according to another embodiment of the present invention, and FIGS. 7 and 8 are conceptual diagrams describing exemplary operations thereof.

[0109] The embodiment shown in FIG. 6 is configured so that the detector 41 is positioned axially downstream on the same side of the pipeline 50, and the detector 42 is positioned upstream so that when the measurement is made by the transit time method unit 10, according to the central axis of the pipeline 50 As a result of the wall reflection on the other side, the propagation paths of the ultrasonic waves emitted from the detectors 41 and 42 form a V shape. Such detector layout methods are collectively referred to as "V methods".

[0110] In the embodiment shown in FIG. 6 , the transit time method unit 10 makes the detector 41 emit ultrasonic waves and, after the ultrasonic waves are reflected by the wall on the other side, measures the pipeline by det...

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PUM

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Abstract

A flowmeter includes: a propagation time difference method unit having a sensor and a reception signal amplification control unit and a flow rate calculation unit which are connected to the sensor via a sensor selector switch; a pulse Doppler method unit having a reception signal amplification control unit and an integration calculation unit which are connected to the sensor; a transmission / reception timing control unit common to them; a measurement method selection control unit for controlling switching between the propagation time difference method unit and the pulse Doppler method unit and parallel operation; and a measurement value output selector switch for selecting the output of the propagation time difference method unit and the pulse Doppler method unit. That is, the single flowmeter can perform flow rate measurement by the propagation time difference method having no restriction on the measurement range as well as the pulse Doppler method having an upper limit of the measurement range but enabling a highly accurate measurement.

Description

technical field [0001] The present invention relates to an ultrasonic flow meter for measuring the flow rate of a fluid by emitting ultrasonic waves into a fluid as an object of measurement, and more particularly, to an ultrasonic flow meter and an ultrasonic flow measurement method, which are effectively applicable to various Flow measurement of fluids, etc. Background technique [0002] The clamp-on type is used to install detectors on the outer wall of the pipe, emit ultrasonic waves from the outside of the pipe into the fluid flowing in the pipe, and measure the flow rate inside the pipe by measuring the change of ultrasonic waves propagating in the fluid. ) ultrasonic flowmeters have many advantages, such as no specific installation work required for existing piping, and minimal influence by fluid temperature or pressure or its corrosiveness. [0003] There are known techniques as flow measurement methods for such flowmeters, such as the pulse Doppler method and the tr...

Claims

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Application Information

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IPC IPC(8): G01F1/66
Inventor 木代雅巳萩原幸治山本俊广矢尾博信大室善则平山纪友
Owner FUJI ELECTRIC CO LTD
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