Abstract The present invention provides an improved burner performance adapting air-swirling vane device comprising air blades fixedly supported and arranged in cone shape between an inner supporting ring and an outer supporting ring, and a restriction ring connected to the inner ring or integrally formed therewith in such a manner that the outlet area of air outgoing through the blades is smaller than the inlet area of air entering into the blades, whereby the widening of the air reversal zone behind the swirling is restricted to a necessary extent, the flame shape is held small, the stability of the holding flame is improved, the range of an oscillating burning is reduced, and an appropriate counter air flow velocity is reduced in the reversal zone for improving the combustion loading. Furthermore, if necessary, a plurality of small holes are formed along a circumference of substantially the middle of the inner ring integrally formed with the restriction ring or along a circumference of the inside diameter side of the restriction ring when this is connected to the inner ring to allow the flow of air to prevent carbon deposit from being accumulated on the vane device.
An air swirler for a burner comprising air swirling vanes of mixed flow type arranged with their tips offset downstream of the roots, an inner ring member supporting the roots, an outer ring member supporting the tips, the inner ring and the outer ring being substantially parallel with the axial direction of the swirler so as to flow the air axially, the positions of the inner ring being offset from the position of the outer ring in the aXial direction upstream of the roots, and a flow restriction ring connected to the inner ring and arranged to restrict the air outlet area of the swirler at the downstream end of the vanes to a dimension less than that of the air inlet area of the swirler at the upstream end of the vanes.
Claim 2
Dependent Claim
133 words
An air swirler for a burner comprising air swirling vanes of mixed flow type arranged with their tips offset downstream of the roots, an inner ring member supporting the roots, an outer ring member supporting the tips, the inner ring and the outer ring being substantially parallel with the axial direction of the swirler so as to flow the air axially, the positions of the inner ring being offset from the position of the outer ring in the aXial direction upstream of the roots, and a flow restriction ring connected to the inner ring and arranged to restrict the air outlet area of the swirler at the downstream end of the vanes to a dimension less than that of the air inlet area of the swirler at the upstream end of the vanes.
Claim 3
Dependent Claim
35 words
An air swirler as claimed in claim 1, in which a plurality of small openings are provided at a circumference in the neighborhood of the junction between the inner ring and the flow restriction ring.
Claim 4
Dependent Claim
35 words
An air swirler as claimed in claim 1, in which a plurality of small openings are provided at a circumference in the neighborhood of the junction between the inner ring and the flow restriction ring.