Patent ID: 8398362
Filing Date: 2013-03-19
Classification: F04D,F05D

Abstract:
1. A turbomolecular pump, comprising a housing ( 1 ) having a high-vacuum side ( 2 ) and a vacuum side ( 3 ); and a plurality of alternatively axially arranged one behind another, rotor and stator discs ( 8 , 9 ) provided with blades ( 10 ), wherein the blades ( 10 ) located in vicinity of the high-vacuum side ( 2 ) have a blade angle (α) that is steeper than a blade angle (α) of the blades ( 10 ) located in vicinity of the vacuum side ( 3 ), wherein the blade angle (α) of the blades ( 10 ) located in the vicinity of the vacuum side ( 3 ) amounts to less than 8°, and wherein an axial height (D) of the blades located in the vicinity of the vacuum side is less than 5 mm.