Fuel burner, arrangement and sleeve therefor and methods

摘要

An adjustable air shutter arrangement for a tubular fuel burner wherein a sleeve is telescoped on the tubular burner for sliding relative thereto to progressively cover and uncover air inlet openings of the fuel burner, the sleeve having a longitudinal slot splitting the sleeve from one opposed end to the other opposed end thereof to define two adjacent longitudinal slot edges of the sleeve. The sleeve has a natural bias that causes the sleeve to grip the tubular burner and tend to move the longitudinal edges thereof together whereby the sleeve tends to frictionally remain in its telescoped position on the tubular burner by its natural gripping bias. The sleeve has tabs on the longitudinal edges to facilitate the spreading apart of the longitudinal edges to thereby permit easy sliding of the sleeve relative to the tubular burner. The sleeve has opposed stops for respectively engaging a projection of the burner that extends through the slot of the sleeve to limit longitudinal sliding movement of the sleeve in opposite directions on the tubular burner. The stops comprise inward steps in the longitudinal edges of the sleeve.