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Doppler-type ultrasonic flowmeter and ultrasonic flowmeter measuring method

一种多普勒式、流量计测的技术，应用在测量流量/质量流量、流体速度测量、液体/流体固体测量等方向，能够解决不优选、设计及成本不优选、不能充分发挥等问题

Inactive Publication Date: 2010-01-06
TOKYO ELECTRIC POWER CO HLDG INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Furthermore, due to the ultrasonic velocity Cw in the measured fluid, the fundamental frequency f of the ultrasonic pulse 0 , Ultrasonic pulse incident angle α, etc. for the most suitable measurement settings vary depending on the type of fluid to be measured, the thickness and material of the pipe, etc., so it is necessary to perform preliminary measurements, that is, to match these settings to the measurement object However, finding the most suitable value and preparing for measurement requires some effort. As a result, the current situation cannot fully utilize the characteristics of measuring with a small error even if there is no "flow rate correction factor".
[0014] On the other hand, it is also possible to design a Doppler type ultrasonic flowmeter equipped with a variety of hardware to match the measurement object and the measurable range, for example, with a variety of hardware according to the size of the pipe diameter and the range of the maximum flow velocity. However, it is not preferable from the point of view of design and cost
[0015] In addition, the measurable distance can be extended by increasing the upper limit of the measurable part, but from the viewpoint of measuring the responsiveness of the flow rate that changes in a short time, there are restrictions on hardware performance and economics
Assuming that even if it can break through the performance and economical limits of hardware, it is too specialized for the current measurable range, and it is not preferable
[0016] On the other hand, conventional Doppler-type ultrasonic flowmeters are configured to be able to measure even if there is a partial reverse flow, that is, a liquid flow with a negative flow velocity. In , the probability of reverse flow is extremely low even if there is some
Therefore, if a flowmeter is made on the premise that there is no backflow, it is possible to expand the measurable speed range, but at this time, there is a problem that there is no mechanism for confirming that there is no backflow

Method used

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  • Doppler-type ultrasonic flowmeter and ultrasonic flowmeter measuring method

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no. 1 Embodiment approach

[0126] figure 1 It is a schematic diagram schematically showing the configuration example of the Doppler ultrasonic flowmeter according to the first embodiment of the present invention, that is, the configuration of the Doppler ultrasonic flowmeter 10 .

[0127] The Doppler type ultrasonic flowmeter 10 is configured to be able to measure the flow velocity distribution of the fluid to be measured 12 (liquid or gas) flowing in the fluid pipe 11 and to measure the flow rate instantaneously over time. The Doppler type ultrasonic flowmeter 10 has: an ultrasonic flow velocity distribution measurement unit (hereinafter referred to as Udflow unit) 13 for non-contact measurement of the flow velocity of the measured fluid 12 flowing in the fluid piping 11; and a computer 14 for Perform arithmetic processing on the electrical signal (data) output from the Udflow unit 13, perform arithmetic processing on the flow velocity distribution of the measured fluid 12 in order to measure the flow ...

no. 2 Embodiment approach

[0147] image 3 It is a schematic diagram schematically showing the configuration example of the Doppler ultrasonic flowmeter according to the second embodiment of the present invention, that is, the configuration of the Doppler ultrasonic flowmeter 50 .

[0148] The Doppler ultrasonic flowmeter 50 is a configuration example of a Doppler ultrasonic flowmeter configured to increase the S / N ratio of reflected waves instead of selecting an optimum frequency of ultrasonic pulses incident into the fluid piping 11 .

[0149] In order to increase the S / N ratio of the reflected wave, it is also possible to change the wall thickness of the fluid pipe 11 to generate a resonant transmission phenomenon, but it is practically impossible to change the wall thickness of the fluid pipe 11 . Therefore, in this configuration example, a method is adopted in which the installation angle of the ultrasonic transducer 20 is changed to have an effect equivalent to that of changing the wall thickness ...

no. 3 Embodiment approach

[0162] Figure 4 to Figure 6 It is a schematic diagram schematically showing the configuration example of the Doppler ultrasonic flowmeter according to the third embodiment of the present invention, that is, the configuration of the Doppler ultrasonic flowmeter 60 .

[0163] Doppler ultrasonic flowmeter 60 as Figure 4 As shown, the Doppler frequency is used to calculate the velocity component V of the measured fluid 12 flowing in the fluid pipe 11 in the direction of the ultrasonic incident angle (entry angle) 2 , based on the calculated Doppler frequency, the flow velocity distribution along the measurement line ML is obtained by the line measurement method, and the flow rate of the measured fluid 12 is calculated.

[0164] In this Doppler type ultrasonic flowmeter 60, the velocity vector V along the ultrasonic line direction (measurement line ML) is calculated from the Doppler frequency 2 , and the velocity vector V 2 Calculate the velocity vector V along the axial direc...

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Abstract

To provide technique as to a Doppler type ultrasonic flowmeter allowing more precise flow measurement even when a measured value of a flow velocity distribution is dispersed. This flowmeter is provided with an output operation monitor provided with a flow velocity distribution outputting means for outputting, on a screen, the flow distribution of a measured fluid in a measuring area, a central display means for displaying the center of a measured point in the measured fluid with respect to the flow velocity distribution displayed on the screen by the flow velocity distribution outputting means, and a divided distribution selecting means for making a user select one of flow velocity distributions divided into two using the central display as a boundary, to be output. A flow rate computing means executes computation using the one divided distribution selected using the divided distribution selecting means, and executes multiplication by two to measure a flow rate of the measured fluid in the measuring area.

Description

[0001] This application is a divisional application. The application number of the parent case is 03817870.2. The application date of the parent case is June 3, 2003. Measurement method and flow measurement procedure used in this Doppler ultrasonic flowmeter". technical field [0002] The present invention relates to a Doppler type ultrasonic flowmeter which uses ultrasonic pulses to measure the velocity distribution and flow rate of a fluid, a flow measurement method and a flow measurement program using the Doppler type ultrasonic flowmeter, and in particular to a method capable of non-contact measurement of various A Doppler-type ultrasonic flowmeter for flow velocity distribution and flow rate of a fluid, a flow measurement method using the Doppler-type ultrasonic flowmeter, and a flow measurement program used in the flowmeter. Background technique [0003] As a Doppler-type ultrasonic flowmeter utilizing the Doppler effect of ultrasonic pulses, there is a technique discl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/66G01P5/24
Inventor 武田靖森治嗣
Owner TOKYO ELECTRIC POWER CO HLDG INC
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