Patent ID: 6564593
Filing Date: 2003-05-20
Classification: D06F

Abstract:
A system for controlling oxygen in an internal atmosphere of a dry cleaning process comprising:a dry cleaning machine having an internal space; a circulation fan means connected by a conduit with said internal space, said circulation fan means for drawing air from said internal space; a first heat exchanger having a cooling coil and a heating coil and a condensate tank, said fan means passing a portion of the drawn air into said first heat exchanger; a valve means having a first branch and a second branch, said valve means connected to said circulation fan so as to receive another portion of the drawn air; a second heat exchanger connected to said first branch of said valve means; a burner connected to said second heat exchanger, said burner having a heating means and a catalytic mass, said heating means for heating said another portion of the drawn air so as to catalytically burn oxygen with solvent vapors, said second heat exchanger connected to an outlet of said burner so as to receive the heated another portion of the drawn air; a first lambda sensor means fitted inside said burner for measuring an oxygen concentration from the internal atmosphere in said dry cleaning machine, said first lambda sensor means interactive with said valve means for sending a closure signal to said valve means if the oxygen concentration corresponds to a pre-set amount; and a second lambda sensor means installed directly in said internal space of said dry cleaning machine and interactive with said valve means for re-opening said valve means relative to an oxygen concentration in said internal space.