Rotary kinetic fluid motors or pumps – With inspection – signaling – indicating or measuring means
Patent
1994-06-01
1996-12-24
Kwon, John T.
Rotary kinetic fluid motors or pumps
With inspection, signaling, indicating or measuring means
4151821, F04D 2900
Patent
active
055868614
ABSTRACT:
A centrifugal fan is provided with an inlet cone that serves to measure air flow through the fan. The inlet cone has a flared inlet for receiving air, a narrow throat, and a flared outlet for expelling air into the center of a rotating fan wheel. Pressure taps are provided to measure the static pressure at the inlet and the throat. The difference between these pressures, adjusted for the empirically determined characteristics of the inlet cone, can be used as an indication of air flow. In one aspect of the invention, a controller monitors the pressure differential, calculates a flow rate based on the characteristics of the cone, and adjusts the fan speed to maintain a desired air flow.
REFERENCES:
patent: 1490976 (1924-04-01), Huff
patent: 1831218 (1931-11-01), Winter et al.
patent: 1897858 (1933-02-01), Peck
patent: 2922431 (1960-01-01), Jensen
patent: 3650633 (1972-03-01), Benoit
patent: 4228753 (1980-10-01), Davis et al.
patent: 4859140 (1989-08-01), Passadore
Publication entitled "The Air Monitor VOLU-probe.TM./F--Fan Inlet Airflow Traverse Probes," 6 pages, Air Monitor Corporation, Santa Rosa, California, copyrighted 1987.
ANSI/AMCA Standard 210-85, ANSI/ASHRAE Standard 5-1985.
Kwon John T.
PACE Company
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