Patent ID: 6911142
Filing Date: 2005-06-28
Classification: B01D,B23Q,Y10T

Abstract:
1. An overhead return pipe system for circulating coolant liquid between at least one machine tool and a filter unit, said return pipe system comprising: a collector for receiving used coolant liquid from each machine tool; a common overhead return line; a return riser leading from each collector to the overhead return line; a return pump for pumping used coolant from each collector through the associated return riser to the overhead return line; a filter unit comprising an upper dirty liquid chamber, a lower clean liquid chamber, and a liquid permeable filter member interposed between said dirty liquid chamber and said clean liquid chamber; a downpipe leading from a first end of said overhead return line to said dirty liquid chamber of said filter unit; a common overhead clean liquid supply line; a clean liquid riser leading from said clean liquid chamber to said overhead supply line; a supply pump for pumping clean liquid from said clean liquid chamber of said filter unit to said overhead supply line; a branch supply line leading form said overhead supply line to each machine tool; a sealed flush tank communicating with a second end of said overhead return line; a flush valve interposed between said flush tank and said overhead return line; a liquid bleed line communicating between said overhead supply line and said flush tank; a flush supply valve on said liquid bleed line; a pressurized gas supply line communicating between a source of pressurized gas and said sealed flush tank; and a gas supply valve on said pressurized gas supply line.