Frequency converter interference solution and measurement system for ultrasonic flowmeter

A solution method and measurement system technology, applied in the field of frequency conversion interference in the ultrasonic flowmeter, can solve the problems of the flowmeter not working, the power input interference of the ultrasonic flowmeter, affecting the received signal, etc., so as to avoid the influence of the flow measurement and the circuit principle. Simple and practical, low cost effect

Inactive Publication Date: 2016-02-03
DALIAN UNIV OF TECH +1
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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 and measurement system for ultrasonic flowmeter

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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 solutions and accompanying drawings.

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

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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 calculates the instantaneous flow velocity of water by using the time difference of the sound wave in the downstream and upstream propagation, and then obtains the instantaneous flow rate when the water flows according to the cross-sectional area of ​​the pipeline, and then obtains the cumulative flow rate when the water flows by integrating the 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 through the downstream probe to obtain the downstream propagation time, and then send the signal ...

Claims

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Application Information

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Patent Type & Authority Patents(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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