Coffee roaster for roasting small quantities of coffee bean, comprises cylindrical roasting chamber, blower with an opening for sucking air for the supply of air into chamber, exhaust port, heating mechanism and rotary nozzle tube

摘要

The coffee roaster for roasting small quantities of coffee bean, comprises a cylindrical roasting chamber, blower with an opening for sucking air for the supply of air into chamber, an exhaust port, a heating mechanism (13) and a rotary nozzle tube. The exhaust port is arranged upstream to a separator for the coffee bean residues transported with the exhaust air and a heating mechanism in air-supply pipe (11). A part of air is blown through a tubing gap, which is formed by the air-supply pipe and a drive pipe (12) and is heated up by the exhaust gases. The hot-air is blown into the roasting chamber over the rotary nozzle tube. The hot-air is deflected at 30-45[deg] towards the bottom of the roasting chamber by means of a nozzle (15). The air pressure adjustment takes place according to the raw coffee quantity, by bypassing the pressure- and the suction side of the lateral channel compressor by means of an adjustable flap. A bleed valve is intended in air-supply duct to limit the air pressure of the supply air during filling of raw coffee into the roasting chamber. A stop valve (41) is intended in the nozzle tube to reduce blow-off volume during the emptying of the roasting chamber.