| 摘要 |
A forced draught fuel burner for use with gas or oil fuel and adapted to operate without swirl is disclosed in which a first inner cylindrical tube substantially concentric with and spaced from a blast tube defines an outer annular space having baffle means positioned within the outer annular space at the outlet ends of the pair of tubes, said baffle means having a substantially perpiheral circular opening of uniform cross-section for discharge of secondary combustion air, a second inner cylindrical tube having means for mounting said second inner tube substantially concentrically within said first inner tube for axial reciprocal travel therein, said second inner cylindrical tube having an inlet end and an outlet end and said second inner tube defining an inner annular space with said first inner tube, a diffuser ring having an outside diameter smaller than the diameter of the first inner cylindrical tube defining a narrow circular slot of uniform cross-section at the periphery of the inner annular space and a plurality of equispaced openings mounted at the outlet end of said second inner tube adapted to be seated within the inner annular space for discharge of primary combustion air from the said inner annular space, said second inner tube defining a central conduit, and closure means mounted in proximity to the inlet end of said second inner cylindrical tube for opening and closing said central conduit whereby an additional flow of primary combustion air through said central conduit can be adjusted.
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