Abstract
To increase the delivery capacity and flow stability of the screw pump and reduce wear between the stator and the rotor, a surface forming method of single-head cone screw-bush pair with equal cavities and large delivery capacity was investigated based on the conventional single cone screw theory. An equation of the cone screw-bush pair surface was established according to the space engagement theory. A flow equation of single cone screw bush pair was built based on the cone screw-bush pair section equation and the rule of its variation. The calculation method of the screw structure size at a given flow rate was determined as well. A kinematics equation of the single cone screw-bush pair was obtained after a kinematics analysis of the single cone screw-bush pair conducted. The movement formula of a single cone screw-bush pair with equal cavities and large delivery capacity was concluded. Three-dimensional model of a single cone screw and a bush was built and the motion simulation of the pair was conducted based on MATLAB and Pro/Mechanism. The kinematics rules were summarized at the same time. Moreover, a single cone screw and a bush solid model were processed based on the three-dimensional model of the cone screw-bush pair and the three-dimensional printing technology. The correctness of the equation of the single cone screw-bush pair surface was verified.
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