Patent ID: 6616426
Filing Date: 2003-09-09
Classification: F04B

Abstract:
An airlift piston mechanism comprising:a cylindrical casing having a piston chamber, an air inlet adapted for guiding outside air into said piston chamber, an air outlet adapted for guiding air from said piston chamber to the outside, and a check valve installed in said air inlet for enabling outside air to pass to said piston chamber and prohibiting inside air from escaping out of said piston chamber to the outside; a piston slidably mounted in said piston chamber for reciprocating motion, said piston comprising an air accumulation chamber, an air hole in communication between said air accumulation chamber and said piston chamber, a check valve mounted in said air hole to let air pass from said piston chamber to said air accumulation chamber and to prohibit air from escaping out of said air accumulation chamber to said piston chamber, at least one annular groove extended around the periphery thereof, and an air passage in communication between said at least one annular groove and said air accumulation chamber; at least one seal ring respectively mounted in the at least one annular groove of said piston, said at least one seal ring each having at least one radial through hole; and a link coupled to said piston and adapted for reciprocating said piston in said piston chamber.