推导了换向器流量特性曲线的函数表达式。从表达式知,当换向器分流隔板经过喷嘴出口作匀速运动时,得到近似呈线性关系的最优流量特性曲线。指出了比留科夫曲线的缺陷。提出了换向器计时误差Δt的实质是安装不对称性和流量特性不对称性造成的计时差,而非行程差。推导了JJG 164—2000中流量计法公式和ISO 4185中静态称量法2种计时差测试计算公式。设计了步进电机驱动系统,并对换向器安装不对称性进行了实验。实验结果表明,当换向器分流隔板提前触发时,计时差产生负偏差;而当分流隔板滞后触发时,计时差产生正偏差;且偏离中心点距离越大,计时差绝对值越大。
Abstract
The function expression of the flow characteristics of the rotary flow diverter was deduced. It can be seen from the expression that when the splitter plate of the diverter moves at a constant speed through the nozzle slot, the optimal flow characteristic curve with an approximately linear relationship is obtained. A flaw of the Biryukov curves was pointed out. It was also proposed that the essence of the flow diverter timing error Δt is the error caused by the installation asymmetry and the flow characteristic asymmetry, not the travel difference. The tow computational equations of the timing error were deduced, the equation in JJG 164—2000(flowmeter method) and the one in ISO4185 standard (static weighing method). A stepper motor drive system was designed, and experiments on the installation asymmetry of the diverter were carried out. The experimental results show that when the diverter splitter plate is triggered in advance, the timing error produces a negative deviation while lag trigger produces a positive deviation; and the greater the distance from the center point, the greater the absolute value of the timing error.
关键词
计量学 /
换向器 /
比留科夫曲线 /
最优流量特性 /
计时差
Key words
metrology /
flow diverter /
Biryukov curve /
optimal flow characteristics /
timing error
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