Patent ID: 7655063

Claim:
A can-filter structure of oxygen concentrator, comprising: a first can-filter, which comprises: a hollow first filter can, filled therein with filter material for filtering air passing therethrough, and having an entrance side and an exit side; an air inlet provided at the entrance side of the first filter can; a hollow first conical joint formed at the exit side of the first filter can; at least one recess provided on the outer surface of the first conical joint; a first tubular portion integrally formed at the narrow end of the first conical joint; and an airtight sealing ring provided around the periphery of the first tubular portion; a second can-filter, which comprises: a hollow second filter can, filled therein with filter material for filtering air from the first can-filter, and having an entrance side and an exit side; a hollow second conical joint formed at the entrance side of the second filter can, for coupling over the outer surface of the first conical joint; at least one resilient engaging hook provided on the inner surface of the second conical joint and corresponding to the at least one recess; and a second tubular portion connecting the entrance side of the second filter can and the narrow end of the second conical joint; and an outlet cover provided at the exit side of the second filter can and coupled to the second filter can by ultrasonic fusion; wherein the first conical joint and the second conical joint may be rotated relative to each other to a position where the at least one resilient engaging hook snaps into the at least one recess so as to form an engagement that detachably fastens the first conical joint and the second conical joint; wherein as the first can-filter and the second can-filter are coupled, the second tubular portion is mounted around the periphery of the first tubular portion, and the airtight sealing ring is disposed between the two tubular portions to provide an airtight effect.