Patent ID: 8545174

Claim:
A nose dome for a turbomachine rotor, comprising: a coupling device having a projection with a cylindrical outer wall, wherein the turbomachine includes an impeller which is arranged in an overhung manner in relation to a bearing point of the turbomachine rotor, wherein in order to guide an axial inflow and/or an axial outflow of the impeller the nose dome is axially connected to the impeller, wherein the impeller and the nose dome are radially mechanically coupled using the coupling device so that a vibrational behavior of the turbomachine rotor is effected, wherein the impeller includes a shaft bore, which is accessible from the outside, the shaft bore has a cylindrical inner wall, wherein the projection is inserted into the shaft bore forming a cylindrical annular gap between the cylindrical outer wall of the projection and the cylindrical inner wall of the shaft bore, and wherein a pressurizing device is used so that the annular gap is pressurized with a pressurizing gas for damping a vibration of the turbomachine rotor, wherein the pressurizing device includes a passage system which is formed in the nose dome, wherein the passage system feeds the pressurizing gas into the annular gap, and wherein the pressurizing gas flows into the annular gap through the cylindrical outer wall of the projection.