A rectifying wind
barrel of a
cooker hood is provided with a rectangular shape, comprising a fume canal base plate, an upper cover, a left side plate, a right side plate and a
turbine housing. An
electric motor is fastened on the
turbine housing side plate of the rectifying wind
barrel, a blade wheel which is covered by the
turbine housing is disposed on the
electric motor shaft, and a fume rectifying part is disposed in the wind
barrel. The rectifying wind barrel rectifies fume by the fume rectifying part, and a wind
inlet flow guiding plate is disposed at the initial position; a flow guiding cover is disposed at the
upper segment of the fume canal formed by a turbine housing wind inlet side plate and the fume canal base plate; the
throat portion of the fume canal outlet is formed by sequentially connecting a wind discharging segment and a wind charging segment of the turbine casing wall, and the turbine housing wind inlet side plate, the wind discharging segment of the turbine housing changes to a curve surface from the housing wall horizontal center, the wind charging segment of the turbine housing wall changes to a curve surface from a folding point upwards, the part of the turbine housing wind inlet side plate adjacent to the
throat portion changes to a curve surface from the horizontal center; and a valve sheet protrudes in the connection barrel on the wind outlet
throat portion. The invention is provided with a simple structure, big extraction force, energy saving little turbulent current forming probability.