WATER-LUBRICATED OIL-FREE COMPRESSOR APPARATUS

摘要

<P>PROBLEM TO BE SOLVED: To provide a water-lubricated oil-free compressor apparatus adapted to suppress power consumption increase needed for cooling the compressor within an allowable range even at a high ambient air temperature. Ž<P>SOLUTION: The water-lubricated oil-free compressor apparatus includes: a water-lubricated oil-free (screw) compressor 1 to suck and compress air; a separator 6; an air-cooled heat exchanger 10; and a refrigerating cycle 27 to circulate refrigerant. The apparatus includes a passage 8 for discharging compressed air and water from the compressor to the separator; a first passage 9 for feeding the water separated by the separator to the air-cooled heat exchanger; and a second passage for supplying the water cooled by the air-cooled heat exchanger from the air-cooled heat exchanger to a bearing 2 and a compression chamber of the compressor. A three-way valve 25 is installed in the second passage. The apparatus includes a branch passage extending from the three-way valve and passing through a heat exchanger 33 of the refrigerating cycle and then returning to the second passage; air discharge passages; and an aftercooler 11. The compressed air separated by the separator passes through the air discharge passages 17 and 19 and is cooled by the aftercooler and then discharged to the outside of the apparatus. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž