Fluid reaction surfaces (i.e. – impellers) – With measuring – testing – signalling or inspection means
Patent
1977-04-26
1979-05-08
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With measuring, testing, signalling or inspection means
415118, 416 1, F01D 2100
Patent
active
041533887
ABSTRACT:
A pulse generator is used to emit a pulse train of specific frequency while two pick-ups--one adjacent a circumferential array of control lugs on the rotor and the other adjacent the blades--emit start counting and stop counting pulses. The number of pulses generated by an external pulse generator are counted during the time interval for the passage of two lugs past a pick-up and the time interval for the passage of two adjacent blades past a pick-up for each revolution of the rotor. A quotient is then obtained from the two pulse numbers for each revolution and the difference between the maximum and minimum values of the quotients obtained during continued rotation is determined. If the difference exceeds a preset critical value, an activity signal is generated, for example to set off an alarm.
REFERENCES:
patent: 1502904 (1924-07-01), Campbell
patent: 2677273 (1954-05-01), Johnson
patent: 2745969 (1956-05-01), Keller
patent: 3467358 (1969-09-01), Zablotsky et al.
patent: 3573520 (1971-04-01), Dorshimer
patent: 4056748 (1977-11-01), Cross et al.
Maurer Andreas
Naegeli John P.
Powell Jr. Everette A.
Sulzer Brothers Limited
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