Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Plural diverse condition responsive
Patent
1976-12-16
1979-01-23
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Plural diverse condition responsive
416 42, 415 48, F04D 2700
Patent
active
041358546
ABSTRACT:
The disclosed system detects the pressure rise across the fan and the flow rate in the system and integrates signals corresponding thereto, and outputs a signal to indicate to the user when the pressure rise exceeds a given level for a corresponding flow rate to warn of a condition within a given degree of a stall condition. The system outputs another signal to block any increase in fan blade pitch and substitutes a decrease pitch signal in response to a predetermined closer approach to a stall condition so that the pitch of the blades is reduced to a position in which the pressure rate rise and flow rate are reduced to a safe level with respect to a stall condition. The system also includes means responsive to the predetermined closer approach to stall to prevent the user from feeding a blade pitch increase signal following a reduction in the pressure rise across the fan until the user resets a bistable device.
REFERENCES:
patent: RE28946 (1976-08-01), Martz et al.
patent: 2407925 (1946-09-01), Gilfillan
patent: 2477954 (1949-08-01), Blanc
patent: 2661145 (1953-12-01), Heineman
patent: 2938536 (1960-05-01), Ehrenberg
patent: 3292845 (1966-12-01), Hens et al.
patent: 3744925 (1973-07-01), Kraemer
Binstock Morton H.
Stern Bertram H.
Arenz E. C.
Powell Jr. Everette A.
Westinghouse Electric Corp.
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