In order to develop screw vacuum pump that works efficiently, runs safely, and can adapt to bad working conditions, a screw rotor with automatic dynamic balancing, which changes in volume, is built. The cylinder of variable pitch Helix parameter equation is calculated using Hermit’s interpolation theory. The variable relationship of variable pitch design parameters, tail compression stages and spiral angle are established. Through calculation, axial distribution of the optimized rotor mass is exhibited and dynamic balance is achieved well by itself without the weight subtraction at both ends and tooth tip of the rotor. The reliability of the design model is proven in the dynamic balance test and a good reference is provided for study on dynamic balance of screw vacuum pumps.
Key words
screw vacuum pump /
static balance /
dynamic balance /
screw rotor /
variable pitch
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Footnotes
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