Electronic control of compressor unloader and air dryer purge

Details Electronic control of compressor unloader and air dryer purge Electronic control of compressor unloader and air dryer purge

1996-06-07

1997-01-14

Sollecito, John M.

Drying and gas or vapor contact with solids

Apparatus

With automatic control

34 80, 96114, F04B 4102, F04B 3906

Patent

active

055927548

ABSTRACT:
An electronically controlled compressed air system (10) includes an air dryer (16) which dries compressed air before the compressed air is communicated to a reservoir (26). The air dryer (16) includes a desiccant (18) which is purged by using air stored in the reservoir (26). A pressure transducer (13) is installed on the reservoir (26) and transits an electrical signal, indicative of the pressure in the reservoir (26) to an electric controller (11). Electric controller (11) transmits signals at various selected pressure levels to solenoid value (28) to control loading and unloading of the compressor (12), to solenoid valve (36) to control purging of the air dryer (16), and to the warning light (40) to alert an operator of a low air pressure condition. The valve (36) is operated to permit purging only when the compressor (12) is unloaded and only until a reservoir pressure is reached which is a predetermined pressure drop below the reference pressure level at which the compressor (12) is unloaded, whereupon purging is terminated.

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