Patent ID: 7799106

Claim:
A gas intake zone ( 1 ) of a divisible gas filter housing which supports a replaceable filter element ( 3 ) and serves as a prefilter having a plurality of cyclone collectors arranged side-by-side, each receiving oncoming flow axially and each having spin-generating elements ( 7 ) in their intake zones and axially immersed gas outlet immersion tubes ( 9 ) on the outlet end in their respective interior within annular channels ( 10 ) provided between these immersion tubes ( 9 ) and the respective cyclone outside walls for preseparation of dirt particles separated radially outward due to centrifugal forces in the individual cyclones, wherein the totality of the cyclones comprises a unit made up of three zones ( 1 ′, 5 ′, 2 ′), namely a first zone ( 1 ′) which is molded in one piece with the filter housing and has first spin-generating partial elements, a second zone ( 5 ′) designed as an insert part ( 5 ) with a second spin-generating component element adjacent to the first spin-generating component elements, which together with the first spin-generating component elements form the spin-generating element ( 7 ) and hollow cylindrical flow channels ( 8 ) situated downstream from the spin-generating element ( 7 ), a third zone ( 2 ′) which is likewise designed as a part to be inserted and contains the immersion tubes ( 9 ) with a bottom surrounding the immersion tubes ( 9 ) to form a dirt particle collecting space ( 11 ) connected to the annular channels ( 10 ) of the cyclones within the filter housing ( 1 ); and the zones ( 1 ′, 2 ′, 5 ′) are each formed by a one-piece-component and produced by a plastic injection moulding process.