GEAR MEASURING VIBRATION AMPLITUDES OF SHROUDED BLADES OF TURBINE BY DISCRETE-PHASE METHOD Russian patent published in 1999 - IPC

FIELD: power engineering, gas steam turbines. SUBSTANCE: gear incorporates magnets installed in nonmagnetic bodies located within bounds of shrouded flanges of blades, three immobile induction transmitters ( one circulating and two peripheral ). Transmitters are connected to recording and analyzing equipment. Cross-section of cores of peripheral transmitters has shape of stretched right-angled triangle with relation of sides 10 ≥b/a ≥ 3, where a and b are width and length of cross-section of core. Angle between axis of least rigidity of cross-section of core of one peripheral transmitter and axis of turbine is equal to α and between similar axis of the other peripheral transmitter and axis of turbine is equal to - α, where 30 deg ≥α≥ 60 deg. Circumferential distance between peripheral transmitters is less than space of working blades. Two or four pairs of similar peripheral transmitters can be installed which ensures possibility of measurement of amplitudes of both separation and multiple vibrations of shrouded blades at constant revolutions of turbine. EFFECT: possibility of measurement of amplitudes of both separation and multiple vibrations of shrouded blades at constant revolutions of turbine. 2 cl, 5 dwg