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在真空系统设计中,常常要根据真空泵的抽速曲线来计算抽气时间。然而如果抽速按照常数计算则会有较大的误差,因此作者对真空泵抽速曲线数值化进行了研究。针对各种真空泵抽速曲线的特点,本文选用曲线拟合的方法对旋片泵抽速曲线中已知点进行重构,再借助Visual Basic6.0语言来编译拟合曲线中取样点的压力-抽速值,可以实现对真空泵抽速曲线的数值化。经实例2XZ-8旋片泵抽速曲线拟合后,计算得到的抽气时间精度提高约22%。结论表明,对旋片泵抽速曲线进行数值化能有效提高抽气时间,管道平均压力等参数的计算精度。
In vacuum system design, it is often necessary to calculate the pumping time based on the pumping speed curve of the vacuum pump. However, if the pumping speed is calculated according to a constant there will be a greater error, so the author of the vacuum pumping speed curve numerical study. In view of the characteristics of pumping speed curve of various vacuum pumps, this paper selects the curve fitting method to reconstruct the known points in the pumping speed curve of the rotary vane pump, then compiles the pressure of the sampling points in the fitting curve with Visual Basic 6.0, Pumping speed value, you can achieve on the vacuum pumping speed curve of the numerical. After the example 2XZ-8 rotary vane pumping speed curve fitting, calculated accuracy of the extraction time increased by about 22%. The conclusion shows that numerical calculation of pumping speed curve of rotary vane pump can effectively improve the calculation accuracy of parameters such as pumping time and average pressure of pipeline.