Fume exhauster device

The fume exhauster device according to claim 8 or claim 32, including a filter ring concentrically arranged to said radial impeller rotor for passage therethrough of the air current exiting from said radial impeller rotor prior to reaching said exit opening.

A fume exhauster device comprising means for generating an air current directed substantially axially, and for directing an air current concentrically surrounding said air current directed axially and having one axial flow-component directed substantially opposite to the flowing direction of said air current directed axially and a second circulating flow-component surrounding said air current directed axially, characterized in that said means comprises a substantially annular exit opening defined at least along its outer periphery by a peripheral boundary surface extending in axial direction for forming said air current concentrically surrounding said air current directed axially into a cylindrical integral shroud, the outer diameter of which is substantially equal to the outer diameter of said exit opening, all of said axially generated air current being directed into an air current concentrically surrounding said air current directed axially and said means comprises a housing defining a substantially annular exit opening.

A fume exhauster device comprising means for generating an air current directed substantially axially, and for directing an air current concentrically surrounding said air current directed axially and having one axial flow-component directed substantially opposite to the flowing direction of said air current directed axially and a second circulating flow-component surrounding said air current directed axially in combination with a wall causing a secant-shaped disturbance of said concentric air current, characterized in that a baffle extending substantially in the axial direction of said concentric air current is disposed on said wall in such a manner that the air flow separating from said wall in the circumferential direction of said concentric air current impinges on said baffle and is deflected thereby substantially back to the original circumferential direction, said means comprises a substantially annular exit opening defined at least along its outer periphery by a peripherical surface extending in axial direction for forming said air current concentrically surrounding said air current directed axially into a cylindrical integral shroud the outer diameter of which is substantially equal to the outer diameter of said exit opening.

A fume exhauster device comprising means for generating an air current directed substantially axially, and for directing an air current concentrically surrounding said air current directed axially and having one axial flow-component directed substantially opposite to the flowing direction of said air current directed axially and a second circulating flow-component surrounding said air current directed axially in combination with a wall causing a secant-shaped disturbance of said concentric air current, characterized in that said wall has associated therewith a curved baffle gradually sloping away from said wall in the axial direction of said concentric air current and operative to slightly tilt said second air current away from said wall with respect to its original axis, said means comprises a substantially annular exit opening defined at least along its outer periphery by a peripherical surface extending in axial direction for forming said air current concentrically surrounding said air current directed axially into a cylindrical integral shroud the outer diameter of which is substantially equal to the outer diameter of said exit opening.