Patent · US Active

Radial gap measurement on turbines

US7889119B2 · kind B2 · utility

15Cited by

27References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Daniel Evers · Oviedo, US
Andreas Ziroff · Munich, DE

Key dates

Filing date	Jul 19, 2007
Grant date	Feb 15, 2011
Priority date	—
Expiry date	Feb 20, 2028

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF05D2260/80
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

Radial gap measurement on turbines by a microwave measuring method and an evaluation of a Doppler effect which varies according to the size of the radial gap is described. At least one radar sensor embodied as a transmission and reception unit is provided in the wall of a turbine housing which is radially oriented towards the centre of the turbine. The relative speed of an outer end of a turbine blade, dependent on the size of the radial gap, is evaluated many times in relation to the radar sensor during the passage of the blade end past the same, and the course of the relative speed over time on the zero crossing constitutes a measure for the radial gap on the basis of the relation between the absolute value of the relative speed and the incline thereof in the zero crossing.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.