Screw rotor is a vital factor affecting the working efficiency of twin screw air compressor. Therefore, a type of twin screw air compressor in coal mine production process is taken as the research object. Firstly, the working principle and process of female and male rotor was introduced and analyzed. Then, according to the principle of parameter selection of the female and male rotor, the relevant design parameters of the female and male rotor are given. Finally, the vector equation and the tooth surface equation of the segmented line are deduced and established respectively for the end face profile and end face tooth surface of the rotor, the area and volume of the tooth are also calculated. The equation of the tooth surface is set up by rotation of rotor’s tooth direction, the inter-tooth area is composed of multi-section smooth curve and the top arc connected to form a circle, which can be obtained by means of analytical method. In order to better meet the requirements of the machining process, it is necessary to coordinate the female and male rotor profile on the coordinate axis when the end face of the rotor is non-symmetrical. This paper provides an important reference for selecting parameters of the rotor of the female and male and calculation of rotor profile.
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