Gas and liquid contact apparatus – Fluid distribution – Valved
Patent
1981-10-22
1982-11-30
Chiesa, Richard L.
Gas and liquid contact apparatus
Fluid distribution
Valved
137132, 137143, 137468, 236 44C, 261 26, 261 36R, 261 97, 261DIG34, 261DIG46, B01F 304
Patent
active
043615228
ABSTRACT:
Apparatus for periodically draining, flushing and replacing the operational water supply in an evaporative cooler during operation thereof and for completely draining the cooler when its operation is terminated. The apparatus includes a special siphon drain valve mounted in the sump of the cooler so as to be normally in an unprimed non-siphoning state and when in such a state, the evaporative cooler will operate in the normal manner. When the cooler is in normal operation, its water supply will increase in mineral salt concentration and other contaminants, such as dirt, bacteria and the like. At periodic intervals, such as under the control of a time clock, a normally closed solenoid operated valve is momentarily actuated from its normally closed state to an open state which directs water under pressure to an injector device associated with the siphon drain valve, and the injector device directs the received water under pressure into the siphon drain valve which causes positive priming thereof to switch it to its siphoning state which drains the water supply from the cooler. The usual make-up water supply device of the evaporative cooler will operate so that the incoming fresh water will dilute the draining water and will thus flush the sump. The drainage flow rate is greater than the flow rate of the incoming fresh water, thus, when the drainage is completed, the siphon drain valve will automatically loose its prime, which allows the sump to be refilled with incoming fresh water. The apparatus may also include a water evaporation rate sensor which increases the frequency rate of the operation of the apparatus when the water evaporation rate of the cooler decreases below a predetermined rate. To accomplish cooler drainage at the termination of cooler operation, the apparatus is operated in the same manner with the cooler's fresh water make-up device being shut off, so that the drained water supply will not be replaced.
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Chiesa Richard L.
Haynes, Jr. Herbert E.
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