Flue terminal gas extractor
OwnerAndre Amphouxinventor
Life of this patent
Estimating the term…
Abstract
A flue terminal extractor mounted at the discharge end of a flue comprises a lower unit mounted coaxially on the flue and an upper unit coaxial with and spaced from the lower unit. The lower unit comprises a downwardly facing frustoconical lower base having a central opening through which the flue extends and an upwardly facing frustoconical lower bonnet joined at its outer periphery with the outer periphery of the lower base and having a central opening in which the flue terminates. The upper unit comprises a downwardly facing conical upper base and an upwardly facing conical upper bonnet. The area of the free space for outward flow of gas between the lower unit and the upper unit is at least equal to the cross sectional area of the flue.
Claims11
A flue terminal gas extractor mounted at the discharge end of a flue and comprising a lower unit and an upper unit coaxial with said lower unit,
- said lower unit comprising a downwardly facing frustoconical lower base having a central opening through which said flue extends, an upwardly facing frustoconical lower bonnet joined at its outer periphery with the outer periphery of said lower base and having a central opening in which the discharge end of the flue terminates, and
- said upper unit comprising a downwardly facing conical upper base and an upwardly facing conical upper bonnet joined at their peripheries, and means mounting said upper unit in spaced relation to said lower unit with the distance between the end of said flue and a circular intersection of a projection of said flue with said upper base equal to at least one-fourth the diameter of said flue,
- said lower bonnet in combination with said upper base comprising venturi means producing an area of negative pressure on the discharge end of said flue upon a generally horizontal flow of air past said extractor, and said lower base in combination with said upper bonnet comprising means for increasing the height of said negative pressure area, said lower unit and upper unit cooperating to prevent back-flow in said flue.
A flue terminal gas extractor mounted at the discharge end of a flue and comprising a lower unit and an upper unit coaxial with said lower unit,
- said lower unit comprising a downwardly facing frustoconical lower base having a central opening through which said flue extends, an upwardly facing frustoconical lower bonnet joined at its outer periphery with the outer periphery of said lower base and having a central opening in which the discharge end of the flue terminates, and
- said upper unit comprising a downwardly facing conical upper base and an upwardly facing conical upper bonnet joined at their peripheries, and means mounting said upper unit in spaced relation to said lower unit with the distance between the end of said flue and a circular intersection of a projection of said flue with said upper base equal to at least one-quarter the diameter of said flue,
- the angle between a generatrix of the frustoconical surface of said lower bonnet and the axis of said flue being substantially equal to the angle between a generatrix of the conical surface of said upper base with the axis of said flue,
- each of said units being symmetrical with respect to a central plane perpendicular to the axis of said flue, the planes of symmetry of the respective units being parallel to one another,
- the angle between a generatrix of the lower base and a generatrix of the lower bonnet and the angle between a generatrix of the upper base and a generatrix of the upper bonnet being of the order of 30.degree. to 35.degree.,
- the outer diameter of said upper unit and said lower unit being about 2.5 to 3.5 times the diameter of said flue, and
- the distance between the end of said flue and a circular intersection of a projection of said flue with said upper base being 0.33 to 0.6 times the diameter of said flue,
- whereby said upper unit and said lower unit cooperate to produce an area of negative pressure on the discharge end of said flue upon a generally horizontal flow of air past said extractor and to prevent back-flow in said flue.
Dependencies are inferred from the claim text.