Patent ID: 9671312
Date: 2017-06-06
CPC Classifications: B24B,F01D,F05D,G01B,G01M,G01S,Y10T

Claim:
1. A method for determining the diameter of a rotor of a turbomachine, which rotor is equipped with rotor blades, comprising: setting the rotor with a number of rotor blades forming a rotor blade ring in rotation, arranging a first clearance measuring device, which is assigned to the rotor blade ring, outside a region of the rotor blade ring, measuring a distance from the first clearance measuring device to the rotor blades of the rotor blade ring which are rotating past the first clearance measuring device, and using the measured distance for determining the diameter of the rotor, displacing the first clearance measuring device in the axial direction of the rotor along a central axis, arranging a third clearance measuring device, which is assigned to a second rotor blade ring, outside the region of the rotor blade ring, and measuring the distance from the third clearance measuring device to the rotor blades of the second rotor blade ring which are rotating past the third clearance measuring device, wherein, during measuring, the rotational speed is identical to, almost identical to or higher than a setpoint rotational speed of the rotor for operation.