SHF DEVICE FOR DRYING OF CORN AND GRANULAR DIELECTRIC MATERIALS Russian patent published in 1994 - IPC

FIELD: SHF devices. SUBSTANCE: the SHF device uses two SHF generators, two resonator hoppers, excitation facilities, pneumatic conveyer; the two resonator hoppers are spaced in height and connected in succession along the flow of the product being treated, they are excited in parallel from one or two generators by means of slotted waveguide exciters connected directly to the flanges of truncated cone transitions of the resonator hoppers and have 3-5 elements of distributed air inlets, and the pneumatic conveyer with its one end is connected to the upper hopper through an outside pipe, and with the other end - to the outlet duct of the lower hopper through a flexible hose via a throw-over mechanical switch of product flow, having "loading", "Circulation" positions; each resonator hopper is connected to a cyclone through an outside pipe. The throw-over mechanical switch has two parallel-connected branch-pipes hinge-joined by a suspension to a symmetrical shoulder of a third branch pipe; fitted on the lower ends of the branch-pipes are flexible hoses, one of which is vacant, and the other is connected to the outlet duct of the lower resonator hopper, and in one of the positions the mechanical switch forms a closed circulation circuit of heated product. Each slotted waveguide exciter has two half-wave slots on the wider wall extending mutually perpendicularly and making up an L-shaped coupling element, and each element of distributed inlet of cooling or heated air is made as a pipe of square or round section closed from one end and has a perforated wall that is common for the resonator hopper. EFFECT: facilitated procedure. 4 cl, 3 dwg