Fan for the ventilation of buildings, e.g. stables

Claim 2

Apparatus for the ventilation of a building, comprising an injection duct; and exhaust duct disposed within said injection duct in substantially concentric relation therewith, said exhaust duct having an aperture in communication with said injection duct; and axial flow fan having a first set of vanes disposed in said exhaust duct and adapted to effect air flow from the building through said exhaust duct when said fan is driven, and a second set of vanes secured to and surrounding said first set of vanes, said second set of vanes being disposed in said injection duct and being adapted to effect an air flow into the building through said injection duct when said fan is driven; means for driving said fan; and damping means movably mounted in said injection duct and being adjustable to effect opening and closing of said injection duct and simultaneous closing and opening, respectively, of said exhaust duct aperture; said damping means comprising a first section movably mounted in said exhaust duct to effect opening and closing of said exhaust duct simultaneously with the opening and closing, respectively, of said injection duct, said first section of said damping means being tubular and having a cross section corresponding to that of said exhaust duct and being in longitudinal alignment therewith, said first section being longitudinally movable toward and away from said exhaust duct aperture to effect closing and opening thereof.

Claim 3

Apparatus according to claim 1 wherein said exhaust duct comprises an inlet opening extending substantially transversely to the longitudinal axis thereof, and wherein said first section of said damping means is movable into and out of the flow path through said inlet opening to effect closing and opening of said exhaust duct.

Claim 4

Apparatus according to claim 2 wherein said injection duct comprises an exit opening extending substantially transversely to the longitudinal axis thereof, and said damping means comprises a second tubular section disposed in surrounding substantially concentric relation with said first tubular section and secured thereto for movement therewith, said second tubular section being disposed in said injection duct and being longitudinally movable into and out of the flow path through said exit opening to effect closing and opening of said injection duct.

Claim 5

Apparatus according to claim 3 wherein said damping means is disposed between said exhaust duct aperture and said inlet and exit openings of said exhaust and injection ducts, whereby movement of said damping means to close or open said exhaust duct aperture results, respectively, in simultaneous opening or closing of sAid exhaust and injection ducts.

Claim 6

Apparatus for the ventilation of a building, comprising an injection duct, an exhaust duct disposed within said injection duct in substantially concentric relation therewith, said exhaust duct having an aperture in communication with said injection duct; and axial flow fan having a first set of vanes disposed in said exhaust duct and adapted to effect air flow from the building through said exhaust duct when said fan is driven, and a second set of vanes secured to and surrounding said first set of vanes, said second set of vanes being disposed in said injection duct and being adapted to effect an air flow into the building through said injection duct when said fan is driven; the flow area of said injection duct being reduced at the portion thereof adjacent said second set of vanes; means for driving said fan; and damping means movably mounted in said injection duct and being adjustable to effect opening and closing of said injection duct and simultaneously closing and opening, respectively, of said exhaust duct aperture.

Claim 7

Apparatus for the ventilation of a building, comprising an injection duct, an exhaust duct disposed within said injection duct in substantially concentric relation therewith, said exhaust duct having an aperture in communication with said injection duct; and axial flow fan having a first set of vanes disposed in said exhaust duct and adapted to effect air flow from the building through said exhaust duct when said fan is driven, and a second set of vanes secured to and surrounding said first set of vanes, said second set of vanes being disposed in said injection duct and being adapted to effect an air flow into the building through said injection duct when said fan is driven; the flow area of said injection duct being reduced at the portion thereof adjacent said second set of vanes; means for driving said fan; and damping means movably mounted in said injection duct and being adjustable to effect opening and closing of said injection duct and simultaneously closing and opening, respectively, of said exhaust duct aperture.

Claim 8

Apparatus for the ventilation of a building, comprising an injection duct; and exhaust duct disposed within said injection duct in substantially concentric relation therewith, said exhaust duct having an aperture in communication with said injection duct; and axial flow fan having a first set of vanes disposed in said exhaust duct and adapted to effect air flow from the building through said exhaust duct when said fan is driven, and a second set of vanes secured to and surrounding said first set of vanes, said second set of vanes being disposed in said injection duct and being adapted to effect an air flow into the building through said injection duct when said fan is driven; said first and second sets of vanes being connected by an annular member that is U-shaped in cross section, with an inner annular branch secured to said first set of vanes and an outer annular branch secured to said second set of vanes, said inner branch being substantially the same size as an in axial alignment with said exhaust duct, said outer branch being disposed within said injection duct, and said branches being connected by an annular connecting portion at the end thereof closest to the intake of said injection duct; means for driving said fan; and damping means movably mounted in said injection duct and being adjustable to effect opening and closing of said injection duct and simultaneous closing and opening, respectively, of said exhaust duct aperture.

Claim 9

Apparatus for the ventilation of a building, comprising an injection duct; and exhaust duct disposed within said injection duct in substantially concentric relation therewith, said exhaust duct having an aperture in communication with said injection duct; and axial flow fan having a first set of vanes disposed in said exhaust duct and adapted to effect air flow from the building through said exhaust duct when said fan is driven, and a second set of vanes secured to and surrounding said first set of vanes, said second set of vanes being disposed in said injection duct and being adapted to effect an air flow into the building through said injection duct when said fan is driven; said first and second sets of vanes being connected by an annular member that is U-shaped in cross section, with an inner annular branch secured to said first set of vanes and an outer annular branch secured to said second set of vanes, said inner branch being substantially the same size as an in axial alignment with said exhaust duct, said outer branch being disposed within said injection duct, and said branches being connected by an annular connecting portion at the end thereof closest to the intake of said injection duct; means for driving said fan; and damping means movably mounted in said injection duct and being adjustable to effect opening and closing of said injection duct and simultaneous closing and opening, respectively, of said exhaust duct aperture.

Claim 10

Apparatus for the ventilation of a building, comprising: an injection duct having approximately 10 to 15 nozzles at the exit end thereof, the axes of said nozzles lying in a plane which is perpendicular to the longitudinal axis of said injection duct, like radii of a circle that is concentric with said injection duct, and separately adjustable throttling means in each of said nozzles; an exhaust duct disposed within said injection duct in substantially concentric relation therewith, said exhaust duct having an aperture in communication with said injection duct; an axial flow fan having a first set of vanes disposed in said exhaust duct and adapted to effect air flow from the building through said exhaust duct when said fan is driven, and a second set of vanes secured to and surrounding said first set of vanes, said second set of vanes being disposed in said injection duct and being adapted to effect an air flow into the building through said injection duct when said fan is driven; means for driving said fan; and damping means movably mounted in said injection duct and being adjustable to effect opening and closing of said injection duct and simultaneous closing and opening, respectively, of said exhaust duct aperture.

Claim 11

Apparatus for the ventilation of a building, comprising: an injection duct having approximately 10 to 15 nozzles at the exit end thereof, the axes of said nozzles lying in a plane which is perpendicular to the longitudinal axis of said injection duct, like radii of a circle that is concentric with said injection duct, and separately adjustable throttling means in each of said nozzles; an exhaust duct disposed within said injection duct in substantially concentric relation therewith, said exhaust duct having an aperture in communication with said injection duct; an axial flow fan having a first set of vanes disposed in said exhaust duct and adapted to effect air flow from the building through said exhaust duct when said fan is driven, and a second set of vanes secured to and surrounding said first set of vanes, said second set of vanes being disposed in said injection duct and being adapted to effect an air flow into the building through said injection duct when said fan is driven; means for driving said fan; and damping means movably mounted in said injection duct and being adjustable to effect opening and closing of said injection duct and simultaneous closing and opening, respectively, of said exhaust duct aperture.