Vacuum dryer

Drying and gas or vapor contact with solids – Material treated by electromagnetic energy – Radio or high-frequency energy

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Details

34 73, 34 78, F26B 334

Patent

active

055750834

ABSTRACT:
This invention relates to a compact vacuum dryer for quickly and economically drying objects such as grain, industrial raw materials and thrash. The vacuum dryer includes a combined upper and lower chamber for accommodating the drying objects. A vacuum pump is connected to the upper chamber for drawing in air for creating the vacuum within the system. A direct heating apparatus is provided at one side of the combination of the upper and lower chambers to directly heat the drying objects. A dielectric heating apparatus indirectly heats the drying objects in combination with direct heating apparatus. A moisture removing apparatus is provided along a discharge passage between the upper chamber and the vacuum pump for preventing the vacuum pump from drawing in moisture from the chamber which may damage or disable the pump.

REFERENCES:
patent: 1726373 (1929-08-01), Voightlander
patent: 2325652 (1943-08-01), Bierwirth
patent: 3538616 (1970-11-01), Malling
patent: 4194296 (1980-03-01), Pagnozzi et al.
patent: 4426793 (1984-01-01), Kuboyama
patent: 4466198 (1984-08-01), Doll
patent: 4525935 (1985-07-01), Stuhmeier et al.
patent: 5353519 (1994-10-01), Kanamaru et al.
patent: 5377425 (1995-01-01), Kawakami et al.

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