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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
P.C:
310009
E-mail:
meem_contribute@163.com
Abstract: In order to solve the problem that altitude and temperature and humidity factors affect the gas flow collection accuracy, on the basis of studying the principle of orifice pressure differential flow control, the influence of temperature and humidity and atmospheric pressure on the gas collection flow accuracy, a flow control system based on orifice differential pressure flow method was proposed.Firstly, the structure of orifice plate was designed, the data acquisition and signal amplification circuit were developed, and the traditional temperature and humidity flow compensation formula was improved to enhance the measurement accuracy of orifice flow under different environmental conditions. Then, based on the pulse width modulation (PWM) air pump control algorithm, the proportional, integral and differential (PID) parameter dynamic adjustment algorithm and the differential pressure zero point self-calibration method were designed; the human-computer interfaces were designed to realize the flexible setting of sampling flow, orifice plate size and range parameters of differential pressure sensor. Finally,in order to verify the accuracy of the flow control system, a prototype of the flow control system was developed and a system experiment was carried out.The experimental and research results show that the indication error of the developed flow control system is within 1.12%, which meets the requirements of the flow calibration specification of the dust particle counter, overcomes the problem of large error of the gas collected flow caused by environmental factors, and it has a good application value in the field of dust particle counter.
Key words: dust particle counter; gas flow acquisition accuracy; orifice plates flow control; atmospheric pressure; data acquisition; automatic calibration of differential pressure zero
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