Catalytic burner with dual mode venturis
OwnerMichael D. Leshnerinventor
Life of this patent
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Abstract
The present invention relates to a two stage venturi for a catalytic burner wherein a large exit aperture size and a small air entrainment opening are used to provide a low velocity, rich fuel/air mixture for the pre-heating process followed by a small exit aperture size and a large air entrainment opening to provide a high velocity, lean fuel/air mixture for the catalytic combustion process. Concentric rotating sleeves are used to vary the size of the exit apertures and the air entrainment openings.
Claims8
A venturi for a gas burner comprising:
- a venturi having an elongated tubular member;
- means at one location on said tubular member for receiving gas fuel under pressure;
- variable sized gas exit apertures at a second location on said tubular member;
- an air inlet aperture at a third location having means for varying the size thereof;
- and means operable by a user for simultaneously increasing the size of said exit apertures and decreasing the size of said air inlet aperture so that a gas exit velocity is less than a flame speed, and for simultaneously decreasing the size of said exit apertures and increasing the size of said inlet aperture so that the gas exit velocity is greater than the flame speed.
A venturi for a gas burner, said venturi comprising variable diameter exit apertures whereby a user may select an exit aperture of a first diameter whereby a gas exit velocity is less than a flame speed and exit apertures of a second diameter whereby a gas exit velocity is greater than a flame speed and further comprising:
- an inner hollow cylindrical sleeve with apertures of said first diameter and said second diameter;
- and
- an outer hollow cylindrical sleeve relatively rotably concentric with said inner hollow cylindrical sleeve, said outer hollow cylindrical sleeve having apertures of said first diameter and said second diameter.
Dependencies are inferred from the claim text.