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一、概述本文研究的标准表法气体流量标准装置流量调节范围宽达(0.5~2000)m3/h,无论是变频风机法还是阀门节流法都难以达到理想效果,因此本文提出结合两种方法,且采用两台不同通径的调节阀,从而实现装置在全流量范围的精确调节。由于调节阀的气动阀门定位器定位准确度低且重复性差,同时超出量程的流量易损坏标准表罗茨流量计,直接进行实验研究风险较大,因此本文提出采用开环实验结合仿真模拟的
I. Overview This standard gas flow standard device standard flow rate adjustment range up to (0.5 ~ 2000) m3 / h, either variable frequency fan method or valve throttling method are difficult to achieve the desired effect, this paper proposes a combination of two methods , And the use of two different sizes of regulating valve, in order to achieve the device in the entire flow range of precise regulation. Because of the poor positioning accuracy and repeatability of the pneumatic valve positioner of the regulating valve, the flow exceeding the measuring range easily damages the standard table Roots flowmeter, and there is a large risk of carrying out direct experimental research. Therefore, this paper proposes to adopt the open-loop experiment combined with the simulation