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罗茨泵转子型线是罗茨泵的关键。零流量压缩比高的罗茨真空泵、湿式罗茨泵真空泵和罗茨鼓风机均要求泵工作时转子与壳体之间及两转子之间气体泄漏较小，这样可改善泵的低压下性能，即提高泵的抽气效率。转子型线为“圆弧－摆线－渐开线”就可以满足这一要求。文中给出了泵的参数选择图，从图中可以看出泵的参数选择范围，文中说明了该图边界的性状．由该图可查出泵的容积利用系数λ同转子顶圆半径Ｒｍ与节圆半径Ｒ之比 Ｒｍ／Ｒ以及同渐开线压力角α的关系。 λ＝ｆ（Ｒｍ／Ｒ，ａ）。图中用计算机绘出了几个比较特征参数下转子型线及其啮合情况，借此可根据实际需要来选择系的转子型线参数。此种转子型线工艺性良好。可仿型法加工（只需两个工位）。还可以用范成法加工其渐开线部分，余下部分用成型铣刀加工。若以范成法加工型线渐开线部分时，设计转子型线时可选取渐开线基圆半径ｒ为整数．以便于其工艺装备的设计。
Roots pump rotor profile is the key Roots pump. Roots vacuum pumps, wet Roots pump vacuum pumps and Roots blowers with high zero-flow compression ratios all require less gas leakage between the rotor and the housing and between the two rotors during pump operation, thus improving pump performance at low pressures, ie Improve pump suction efficiency. Rotor type line for the “arc - cycloid - involute” to meet this requirement. The paper gives the pump parameter selection chart, from the figure you can see the parameters of the pump range, the paper describes the boundaries of the figure traits. From this figure, it is possible to find out the relationship between the volume utilization factor λ of the pump and the ratio Rm / R of the radius Rm of the top circle of the rotor to the pitch radius R and the pressure angle α with the involute. λ = f (Rm / R, a). The figure uses computer to draw several characteristic parameters of the rotor under the line and its meshing situation, which can be based on the actual need to select the Department of the rotor profile parameters. This type of rotor technology is good. Can be imitation method of processing (only two stations). Fan can also be used to process its involute part, with the remaining part of the milling cutter processing. If Fan Cheng Fa processing involute part of the model, the design of the rotor profile can choose involute base radius r is an integer. In order to facilitate the design of its process equipment.