Patent ID: 7927395

Claim:
A centrifugal separator for cleaning of gas from solid or liquid particles suspended therein which are of greater density than the gas, which centrifugal separator comprises: a rotor housing which delimits a separation chamber and has a gas inlet to the separation chamber and a gas outlet from the separation chamber, a rotor which by means of a driving device is rotatable around a rotational axis and adapted, during operation, to bring the gas into rotation in the separation chamber, wherein the rotor comprises a stack of frustoconical separation discs which are disposed coaxially with one another and concentrically with the rotational axis and which by means of spacing elements are arranged at mutual spacing such that they delimit between them interspaces for gas to flow through, an inlet space arranged centrally in the stack of separation discs, which inlet space communicates with the gas inlet and with radially inner parts of the interspaces between the separation discs, and an annular flow space which surrounds the rotor and is delimited radially by the rotor housing, which annular flow space communicates with radially outer parts of the interspaces between the separation discs and with the gas outlet; and the interspaces have substantially no obstruction to flow in the circumferential direction throughout the entire outer radial parts of the interspaces and that mutually adjacent separation discs are arranged at mutual spacing such that rotation of the rotor causes in the interspaces a pumping action which drives the gas from the gas inlet, through the interspaces between the separation discs and out via the gas outlet.