Patent ID: 7651316

Claim:
A conveying member including one of a rotor or stator for conveying a flowable, medium, the conveying member comprising: a plurality of blades arranged following each other with a circumferential distance around a central axis, wherein either a first circumferential distance or a second circumferential distance differing from the first circumferential distance between a blade and a respective blade following said blade in the circumferential direction is provided in a group of blades directly following each other in a circumferential direction, said group comprising at least part of the blades, and wherein the first circumferential distance is provided between at least two of said blades located directly adjacent to one another, and the second circumferential distance is provided between at least two blades located directly adjacent to one another; a sequence of the first circumferential distance and the second circumferential distance in the circumferential direction corresponds to a pseudostatistical binary sequence for the blades of the group of the blades, wherein each of the two binary states corresponds to one of the circumferential distances of the first circumferential distance and the second circumferential distance, the number n of the blades being defined by n= 2 Z −1, in which: Z=2, 3, 4, 5, 6 . . . .