| 摘要 |
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.
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