Patent ID: 7559982

Claim:
A dust collector comprising: an upright tubular main body closed at top and bottom; a tubular partition wall of a reduced diameter concentrically arranged internally of said main body to define a centrally located filtration chamber and an annular cyclone chamber situated outwardly of said filtration chamber, the lower edge of said partition wall terminating upwardly away from the bottom of said main body so that said filtration chamber and said cyclone chamber are in communication with each other at a lower part thereof; a filter arranged in said filtration chamber and made of a filtration material for collecting submicron size particles; means for applying vacuum to a secondary side of said filter; an air inlet opening tangentially to an upper part of said cyclone chamber; a drain opening located at the bottom of the main body; spray means, provided at the upper part of said cyclone chamber, for forming a film of water flowing down along the inner circumferential surface of said main body and a film of water flowing down along the outer circumferential surface of said partition wall, respectively, to ensure that a swirling stream of air to be treated, drawn through said air inlet into said cyclone chamber, is brought into contact with said water films to thereby cause airborne dust and particles in the air to be treated to be captured therein and to cause captured dust and particles to be washed away, wherein said spray means directs substantially the entire amount of water supplied thereto onto the inner circumferential surface of said main body and the outer circumferential surface of said partition wall whereby said substantially entire amount of water is consumed in the formation of the water films, wherein said spray means is an annular member with a plurality of nozzles which spray the water horizontally onto the inner circumferential surface of said main body and onto the outer circumferential surface of said partition wall, thereby wetting the inner circumferential surface and the outer circumferential surface 360 degrees around; and wherein said air inlet is located below and spaced from said spray means.