PROCESS MEASURING PARAMETERS OF MOTION OF BLADES OF HELICAL FAN Russian patent published in 2000 - IPC

FIELD: contactless monitoring of parameters of motion of blades of helical fan in process of testing and operation. SUBSTANCE: two eddy current converters are placed on stator of helical fan. Converters are so spaced along axis of helical fan that end face of blade does not fall outside sensitivity zone of converters. Converters are excited by sequences of groups of pulses. Number of groups of pulses equals number of blades of helical fan. Radial clearances between blades and converters are found by signals of converters. Given process makes it possible to determine angles of driving and setting of blades by difference of time intervals between synchropulse and moments of emergence of minimal clearances between blade and centers of both converters. EFFECT: improved reliability of determination of radial clearances between blades and converters. 3 dwg