US 9,810,520 B2
Measuring relative concentricity deviations in a confined space between two circumferential elements
Piotr Krzysztof Dzięcioł, Warsaw (PL); Paul Howard Davidson, Schenectady, NY (US); Adrian Adam Klejc, Warsaw (PL); and Jean-Marie Deschamps, Belfort (FR)
Assigned to GENERAL ELECTRIC COMPANY, Schenectady, NY (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Oct. 5, 2015, as Appl. No. 14/875,024.
Prior Publication US 2017/0097225 A1, Apr. 6, 2017
Int. Cl. G01B 7/14 (2006.01); G01B 7/312 (2006.01)
CPC G01B 7/312 (2013.01) [G01B 7/14 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A tool for measuring relative concentricity deviations in a confined space between a turbine rotor and a turbine diaphragm, the tool comprising:
a housing;
a sensor coupled with the housing, the sensor measuring a distance from the housing to one of the turbine rotor and the turbine diaphragm;
an axial spring plunger connected to the housing;
a radial spring plunger connected to the housing and orthogonal to the axial spring plunger; and
a sliding or rolling surface on a side of the housing opposite from one of the axial spring plunger and the radial spring plunger,
wherein the housing is sized to fit in an L-shaped groove formed in the turbine diaphragm, and wherein the housing comprises an axial step section protruding axially from the housing and extends substantially to a floor of the groove such that the housing is shaped corresponding to the L-shaped groove in the turbine diaphragm.