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Frequency converter interference solution for ultrasonic flowmeters and measurement system

A solution, flowmeter technology, applied in the field of frequency conversion interference in ultrasonic flowmeters, can solve the problems of affecting the receiving signal, flowmeter failure, ultrasonic flowmeter power input interference, etc., to achieve low cost and avoid flow measurement impact , The circuit principle is simple and practical

Inactive Publication Date: 2013-10-16
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

When the ultrasonic flowmeter is working, the corresponding water pump usually needs to be driven by a frequency converter, which will cause strong interference on the power input of the ultrasonic flowmeter, which will seriously affect the received signal and cause the flowmeter to fail to work.

Method used

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  • Frequency converter interference solution for ultrasonic flowmeters and measurement system

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Embodiment Construction

[0012] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solution and the drawings.

[0013] in figure 1 In the external power input, 220V AC input or 24V DC input can be selected. The two are converted by IC1 and IC2 respectively to obtain 5V power. After IC3 is converted, 3.3V is obtained for IC4. The 5V power is divided into two channels after switching by relay S1. One channel is +5V_1 and GND_1, which is used for channel A DC-DC power input. After IC5 conversion, +3.6V_A and GNDA are obtained, which are used for power supply of channel A measurement circuit. The other channel is +5V_2 and GND_2. B channel DC-DC power input, after IC8 conversion, get +3.6V_B and GNDB, which are used for the power supply of the B channel measurement circuit; the on and off of relay S1 is controlled by the CON pin of the CPU, two channels of S1 The normally closed point is connected to the positive and negative input terminals...

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Abstract

The invention discloses a frequency converter interference solution for ultrasonic flowmeters and a measurement system, and belongs to the field of instruments and meters. Two ultrasonic flowmeters are arranged in a pipeline under test in identical upstream and downstream mode; one ultrasonic flowmeter is operated through a rechargeable battery in an operation mode, the other ultrasonic flowmeter is in a ready mode, and a rechargeable battery of the ultrasonic flowmeter in the ready mode is in a charging mode; the operation modes of the two ultrasonic flowmeters are switched in certain switching period. The frequency converter interference solution is based on a low-power dissipation double-channel ultrasonic flowmeter technology, when an external power supply supplies power, power is supplied to two sound channels through batteries, measurement circulation switching is performed between the two sound channels, and that power is supplied to the sound channel which is currently measured through batteries is always ensured through switching, so that interference caused by the external power supply is avoided after a frequency converter is operated. The two sound channels adopt low-power dissipation design, and rechargeable batteries which can be repeatedly changed guarantee the long-term operation of the flowmeters.

Description

Technical field [0001] The invention belongs to the field of instruments and meters, and relates to a water flow measurement method, in particular to a solution to frequency conversion interference in an ultrasonic flowmeter. Background technique [0002] Ultrasonic flowmeter has the advantages of high measurement accuracy and convenient use, and has been widely used in water flow measurement. It uses the time difference between the propagation of sound waves in the forward and backward flow to calculate the instantaneous flow velocity of water, and then obtains the instantaneous flow when the water flows according to the cross-sectional area of ​​the pipeline, and then obtains the cumulative flow when the water flows through the integration of time. It can be seen that when the ultrasonic flowmeter is working, it needs to send a signal through the upstream probe and receive the signal by the downstream probe to obtain the downstream propagation time, and then send the signal thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66
Inventor 李卓函王超段同磊孟祥阳
Owner DALIAN UNIV OF TECH
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