Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1998-05-13
1999-11-16
Wayner, William
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62 93, 62180, 95 19, 96402, F25D 2106, F25D 1706
Patent
active
059836512
ABSTRACT:
The present invention relates to a dryer for compressed air. The dryer employs two evaporators disposed in the compressed air pathway. The dryer uses a three-way valve to control the orientation of the compressed air current. A heat-exchanger is included in the cold-producing medium system for avoiding ice blockage of the compressed air outlet. The dryer provides the high-pressure cold-producing medium at a front portion with more potential cooling, so that the evaporators create a lower temperature for drying the compressed air better. A four-way valve is provided to control the two evaporators working alternately, so that the high-temperature cold-producing medium is directed into the iced idle evaporator by a solenoid valve, to melt the ice rapidly and drain it from the system immediately through an automatic drain valve. Two pressure-sensing devices are respectively located on the inlet and outlet of the compressed air pathway, and a temperature-sensing device is located on the cold-producing medium low-pressure return conduit. A microprocessor collects the values detected by all of the sensors to control the three-way valve, four-way valve and the solenoid valve, in a desired time sequence to obtain dryer compressed air.
REFERENCES:
patent: 4928498 (1990-05-01), Gossler
patent: 5794453 (1998-08-01), Barnwell
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