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A heat exchanger for mixtures of air and solid particles, particularly for woodworking shops, poultry farms and industrial environments of the like. The heat exchanger comprises a bank of staggered tubes through which warm air is exhausted, a casing with baffles enclosing the bank of tubes such that

A heat exchanger for mixtures of air and solid particles, particularly for woodworking shops, poultry farms and industrial environments of the like. The heat exchanger comprises a bank of staggered tubes through which warm air is exhausted, a casing with baffles enclosing the bank of tubes such that fresh air is forced between tubes in two or more successive passes, a series of cone-scrapper assemblies equally spaced on a rod inside each tube, and a pull frame connecting all rods, for reciprocating all scrapers in harmony.

대표청구항 ▼

A heat exchanger for air comprising; a bank of tubes through which warm air is blown, a casing with baffles, enclosing said bank of tubes such that fresh air to be heated is forced between all said tubes in two or more successive passes, a plurality of cones equally spaced on a rod inside each said

A heat exchanger for air comprising; a bank of tubes through which warm air is blown, a casing with baffles, enclosing said bank of tubes such that fresh air to be heated is forced between all said tubes in two or more successive passes, a plurality of cones equally spaced on a rod inside each said tube, a plurality of collapsible tube scrapers, each said scraper being mounted on said rod, next to each said cone, a pull frame connecting all said rods, and a pull frame reciprocating means, having a reciprocating stroke length slightly longer than said spacing of said cones, said collapsible tube scraper comprising, a pivot disc having four sockets, extending radially from said rod, and being spaced at 90°apart, and four wires having each a stem pivotally retained within each said socket, a sharp bend next to said stem a scraping portion formed according to the curvature of one-quarter of the circumference of said tube, and a tail end making an obtuse angle with said scraping portion, each said wire being installed in said pivot disc such that each said tail end intersects with said sharp bend of said adjacent wire when said scraper is being pulled in the scraping direction.