Construction of Positive Displacement Pump without Sliding Friction

Positive displacement pump is a kind of pump that translate the fluid via changing the volume of closed space. Changing the volume of closed space is based on the relative movements between the mechanical structures composing such space. Now, all the positive displacement pump cannot avoid sliding frictions between these mechanical structures. If the sliding frictions can be replaced by rolling frictions, the forces of frictions can be greatly reduced, so that the efficient and life of pump can be improved. Avoiding frictions while keeping seal is a challenging geometric designing problem. With the regular octahedron as the basic structure, this structure is successfully realized by placing a specially shaped rotor and piston on its ribs and faces, and the working process of this structure is simulated using 3D geometric modeling software. This construction not only show the possibility of realizing a positive displacement pump without slide friction, and has great value for designing a kind of positive displace pump with highly efficient. © 2020 Journal of Mechanical Engineering.