Rotary piston pump is designed by the Wankel engine.The structure,working feature and sealing system of rotary piston pump are introduced.The mathematical model of the internal cylinder profile and the theoretical flow are obtained by analysing the structural characteristics of the new pump.The axial seal and face seal of the rotary piston pump and their structures are analysed.The force analysis of the sealing strip is carried out in various cases.It can be concluded from the analysis that,for axial sealing,the key parameters that affect seal strip wear are working pressure,rotate speed of the crankshaft and the friction coefficient between sealing strip and inner wall of the cylinder.For axial sealing,the force of the spring under the curved sealing strips,the size of the sealing rings and curved sealing strips and material of them are the key design parameters.
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