Patent ID: 8784035

Claim:
A bladeless pump comprising: a rotor housing, including walls defining a volute, the volute having a knife edge, a volute fluid outlet, and walls defining a rotor feed opening; fluid inlet walls, including walls defining a fluid inlet and passageway walls for carrying fluid from the fluid inlet to the rotor feed opening; a rotor assembly, including a multiplicity of rotors, each rotor having a runner portion, the runner portion having a first thickness T 1 , walls defining a multiplicity of central openings, and a multiplicity of spokes, the spokes including walls defining an axle opening, the spokes having a second thickness T 2 , the second thickness greater than the first thickness Ti; an axle; and a retaining collar; and wherein the rotors engage on the axle; wherein the rotor housing substantially encloses the runner portions of the rotor assembly; and wherein the spokes of the rotors include alignment locking means.