The invention relates to a range hood. Brand new design is adopted for a mechanical structure, a working mode, a purification mode, a
flue structure, a circulation mode and a
control mode of an existing range hood. Efficiency, energy-saving performance and cleaning performance are higher. The range hood comprises a range hood body 1, a straight-through gas duct and a hemispherical and double-arc
plasma electrostatic blade 7, a valve capable of being opened and closed, an indoor gas outlet 8 capable of being linked, a venturi principle gas inlet and gas outlet
flue 9, an
exhaust gas recirculation pipeline 11, an EGR control valve 12, a venturi tube type EGR
system 13, an
exhaust gas circulating
system 14 with a
machine turbochargning device and a turbocharging device, a flow guide vane 15 with an adjustable section, an
exhaust pipe 16 allowing a hole in an exhaust tube for exhausting circulation of the range hood, a 4-2-1 exhaust tube 17, a single-
turbine double-vortex tube 18 and a
smoke machine shell cavity integrated type pipeline 19, wherein a
centrifugal fan 2 is replaced with a movable vane adjustable axial flow fan and a
mixed flow (oblique flow) booster fan; the fans can also be connected in parallel and connected in series, and the rotating speed can be adjusted; an
impeller adopts three-element flow blade design 4; guide grooves 5 and a
fan blade fairing 6 are arrangedon the
impeller; and a sawtooth shape 10 is adopted at the
tail edge of the contraction section of an exhaust port.