1. Roots pump is the key part of the rotor, and the rotor is the key to its profile. The outline of the rotor cross-section is the rotor's profile. Pump work, the rotor surface does not touch, but the gap between the rotor to maintain a certain, so the rotor must be made of conjugate curve. In the actual design of the rotor type selection, in addition to be able to meet the above movement requirements, but also consider the following conditions: (1) pump rotor volume utilization factor should be as large as possible, that is, the rotor occupies a smaller volume (2) rotor Should have a good geometric symmetry, to ensure smooth operation, good interchangeability (3) to ensure that the rotor has sufficient strength (4) the rotor should be easy to process, easy to get higher accuracy commonly used rotor profile arc arcuate , Involute tooth and cycloid tooth type and so on. In recent years, Northeastern University put forward a "arc → involute → cycloid" type of rotor air resistance, improve the performance of the pump at low pressure to improve the pumping efficiency of the pump, has been more widely used. I believe there will be a newer and better Rotor pump rotor profile, the Roots pump performance further improved. 2. In order to control the pump rotor asked, the gap between the rotor and the pump housing, bearing axial, radial displacement control within a certain range. In the design, should be the correct choice of bearing accuracy, and select the type of bearing suitable for pump working conditions. Considering the effect of axial thermal expansion of the rotor, the rotor shaft should have a live end (usually a gear end) to allow axial movement of the shaft due to thermal expansion and other factors. The axial clearance between the rotor and the side end of the shaft can be selected to be larger, while the axial clearance between the rotor and the end cover of the shaft should be chosen to be smaller. 3. Require gear wear resistance, smooth transmission, the gap between the teeth should not be too large. Gear accuracy often use 5 to 6 levels. In order to make the transmission smooth, low noise, commonly used helical gear. In order to make the gear assembly and adjust the gap between the rotor convenient, choose the structure of the gap adjusting gear and the gear between the shaft and the box upskirts connection.
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