Range hood and volute thereof

The utility model discloses a range hood and a volute thereof. The range hood comprises a case, a volute, a wind wheel and an outer switching cover plate, wherein a first outer air exhaustion hole and a second outer air exhaustion hole are formed in the case; the volute is arranged in the case; a volute body of the volute comprises a bottom plate, a top plate and a side coaming arranged between the bottom plate and the top plate; an outer air outlet communicated with the first outer air exhaustion hole and the second outer air exhaustion hole is formed in the volute body; an opening direction of the outer air outlet is orthogonal to that of the second outer air exhaustion hole; the wind wheel is arranged in the volute body; the outer switching cover plate is movably arranged on the volute or the case between a first position in which the first outer air exhaustion hole is opened and the second outer air exhaustion hole is closed and a second position in which the first outer air exhaustion hole is closed and the second outer air exhaustion hole is opened; an included angle alpha between the outer switching cover plate and the second outer air exhaustion hole at the second position is more than zero and less than 90 degrees. The range hood provided by the embodiment of the utility model has the advantages of small air volume, small wind pressure loss, high efficiency of the wind wheel, low pneumatic noise and the like.