Anti -drop's bell jar formula hood

The utility model discloses there is the hood head to present hood and easily drops, influence the normal continuous operation's of boiler problem, and provide an anti -drop's bell jar formula hood. Include hood head, hood connecting pipe and sleeve pipe component, the hood head is the open casing of upper portion closed bottom, and there are a plurality of holes of airing exhaust the lower part of hood head by the edge, and hole along the circumference evenly distributed that airs exhaust, hood connecting pipe are the pipe form, and the top of hood connecting pipe is located to the hood headgear, overlaps the sleeve pipe that is equipped with certain length outside the hood connecting pipe upper end, the hole below of airing exhaust of hood head, be equipped with the loop type boss that extends to hood head inner chamber apart from hood head bottom certain distance department, the sleeve pipe lower part is equipped with outside boss, circle clearance fit in the inboard loop type boss of the excircle of boss