INDUCTOR-TYPE HIGH-FREQUENCY PLASMA GENERATOR Russian patent published in 2004 - IPC

FIELD: electrical engineering.

SUBSTANCE: proposed plasma generator has cylindrical discharge chamber in the form of shaped longitudinal metal sections placed in dielectric shielding shell, inductor enclosing the latter, as well as main and heat-protection gas inlet units mounted in end part of discharge chamber. Heat-protection gas inlet unit is made in the form of one or more coaxial ring rows of longitudinal metal tubes, their quantity being same as that of shaped longitudinal metal sections. Tubes disposed on inductor end have shaped gas outlet clearance as well as longitudinal clearance relative to adjacent tubes in row spacing them apart through minimum one inner diameter of discharge chamber starting from closest turn of inductor. Tubes are soldered or welded on side surface to radially arranged longitudinal metal tubes of adjacent coaxial ring row, longitudinal metal tubes of adjacent row closest to longitudinal shaped metal sections being soldered or welded on side surface to adjacent section. Main gas inlet unit has diaphragm on inductor end spaced at least one inner diameter of discharge chamber from closest turn of inductor and provided with at least one gas passing hole. Butt ends of gas-outlet longitudinal metal tubes are disposed in each row beyond inductor area and are equally spaced from its closest turn; distance between butt ends of gas-outlet longitudinal metal tubes and closest turn of inductor increases with distance between coaxial ring row and shaped longitudinal metal sections. Longitudinal metal tubes are arranged on surfaces of adjacent radial longitudinal metal tubes; longitudinal metal tubes of coaxial ring row closest to shaped longitudinal metal sections are disposed on surfaces of adjacent sections. Diaphragm mounted on inductor end and longitudinal metal tubes of closest coaxial ring row form annular clearance for gas passage; height of annular gas-passage clearance is smaller than that of shaped clearance for gas outlet from longitudinal metal tubes of closest coaxial ring row. Proposed design of this plasma generator that functions as low-temperature plasma generator in jet-plasma processes for treatment of dispersed materials has enabled building effective plasma reactor plants for uncovering finely dispersed crude raw, spheroidizing dispersed materials, and producing highly dispersed oxide powders due to generation of nonswirling plasma jets at plasma generator thermal efficiency over 80%.

EFFECT: enhanced service life and efficiency of plasma generator.

16 cl, 5 dwg