The vacuum pumping characteristic coefficient is the ratio of the effective pumping speed (L/s) of the vacuum pump to the square of the inlet diameter (cm) of the vacuum pump. For a given vacuum pump, as long as the pumping speed value at each pressure point is accurately measured, and the pumping speed-pressure characteristic curve of the pump is plotted according to the data, the exact Z value and any pressure at each pressure point are obtained. The Z value on the point. Here we must point out that no matter whether the effective pumping speed of the vacuum pump is determined or the pumping speed characteristic coefficient of the vacuum pump is determined, their pressure point or pressure interval must be marked to have clear meaning.
Evaluating and Selecting the Characteristic Coefficient of Vacuum Pumping Speed ​​In actual test work, we can see that the actual pumping speed of the vacuum pump at each pressure point can be said to be completely different, especially in the field of oil vapor flow vacuum pumps. In order to obtain the Z value at each pressure point of the vacuum pump, the pumping speed value at each pressure point must be measured first, and then the pumping speed-pressure characteristic curve is drawn based on these data. According to the above test data and this curve, the pumping speeds at each pressure point and any pressure point can be obtained. According to the size of the given pump inlet diameter, the Z value at the corresponding pressure point can be obtained. In order to indicate the pumping speed characteristics of the vacuum pump, the law and characteristics of the Z value can be found out, and according to the standard requirements, the main Z value and the auxiliary Z value at a specific pressure point are determined.
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