Gas and liquid contact apparatus – Fluid distribution – Pumping
Patent
1979-11-06
1981-02-24
Chiesa, Richard L.
Gas and liquid contact apparatus
Fluid distribution
Pumping
261109, 261DIG11, 415 17, 416 39, B01F 304
Patent
active
042527511
ABSTRACT:
A fan control system for cooling apparatus such as cooling tower in which water and air are brought into contact together. According to this system, the running speed of the fan is continuously and proportionally changed responsive to the temperature of the cooling water or the external atmospheric conditions, to substantially control the cooling capacity of the cooling apparatus. The control system consists of a main fan motor, an electronic adjustment circuit and a power transmission means consisting of a variable pitch diameter belt speed changing means and a constant pitch belt reduction device, whereby the speed changing ratio of the belt speed chaning means is continuously and proportionally changed depending upon the control signals from the adjustment circuit. Further, the adjustment circuit may have a soft-start control circuit.
REFERENCES:
patent: 2253406 (1941-08-01), Wagner
patent: 2287297 (1942-06-01), Dewey
patent: 2669404 (1954-02-01), Howard
patent: 2939687 (1960-06-01), Goettl
patent: 3130557 (1964-04-01), McFarlan
patent: 3494109 (1970-02-01), Blazer et al.
patent: 3630496 (1971-12-01), Hurst et al.
patent: 3637194 (1972-01-01), Swimmer et al.
patent: 3637195 (1972-01-01), Blazer et al.
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