GRAIN DRYING APPARATUS Russian patent published in 2007 - IPC F26B11/14 

FIELD: agricultural engineering, in particular, grain drying technique.

SUBSTANCE: apparatus has heat-insulating casing, cylindrical perforated housing concentrically secured within casing, perforated sleeve fixed within housing at the side adjoining charging hopper, discharge window, spring-type transportation device disposed for rotation within annular gap between housing and sleeve, fan communicating through air duct with sleeve inner cavity, filter located between air duct and fan, and drive for transportation device. Sleeve and housing perforations are made in the form of cuts arranged so that they extend from charging hopper to discharge window along helical lines, in offset relation with respect to one another. Width of cuts is reducing from charging hopper to discharge window. End surface of heat-insulating casing is made dead at the side adjoining charging hopper and perforated at the side adjoining discharge window. Heating members are provided at outer surface of perforated housing and inner surface of sleeve along cuts for regulation of their heating temperature lengthwise of apparatus.

EFFECT: reduced heat losses, improved quality of grain drying process, and improved working conditions for personnel.

1 dwg