APPARATUS FOR VACUUM DRYING LUMBER Russian patent published in 2007 - IPC F26B9/06 F26B5/04 F26B21/04 

FIELD: drying solid materials.

SUBSTANCE: apparatus comprises drying chamber, gas blower, circuits for drying agent, recuperator, devices for reversing flow of drying agent, and device for providing vacuum drying regime. The device for providing vacuum drying regime is made of two four-way flow switchers mounted on the sucking and pressure sides of the gas blower. Three connecting pipes of the switchers are connected with the gas blower, main, and additional circuit of circulation, respectively. The fourth connecting pipe is in communication with the atmosphere and is provided with the controlled throttle member.

EFFECT: simplified structure.

7 dwg