罗茨真空泵试验方法的研究

Study on testing method of Roots pump

罗茨泵的抽气速率和极限压力是泵的主要性能,但它在很大程度上要依赖于前级泵的型式和性能,因此它并不是罗茨泵本身特有的性能。能代表罗茨泵特征性能,而又与前级泵无关的是零流量压缩比、最大允许压差与溢流阀压差、漏率和噪声,它们与罗茨泵的真空状态、抽气性能和运行质量有着极其密切的关系。文中对特征性能的试验方法和装置进行了分析和研究,提出了有异于国内外现行标准的,更精粹、独特的见解。

The pumping speed and ultimate pressure is the basic performance of a Roots pump,but both rely on the type and performance of its backing pump to a great extent.It implies that the two parameters cannot represent the essential characteristics of Roots pumps.What represent the essential characteristics of Roots pumps include the zero flow compression ratio,maximum permissible differential pressure and the differential pressure of overflow valve,leakage rate and noise,and all of them are irrelevant to the backing pump but closely relevant to the vacuum conditions,evacuating capacity and operating conditions of Roots pumps.The testing methods and relevant devices of Roots pumps＇ characteristic properties are investigated and,as a result,some penetrating and distinctive ideas dissimilar to existing domestic/foreign standards are put forward.