Centrifugal Air Blower, Air Blowing Device, Air Conditioning Device, And Refrigeration Cycle Device

Abstract: This centrifugal air blower is provided with: a fan that has a disk-like main plate and a plurality of blades; and a scroll casing that accommodates the fan. The scroll casing is provided with: a discharge part; and a scroll part having a side wall, peripheral walls, and a tongue section. The peripheral walls include a curved peripheral wall and a flat peripheral wall. When comparing the present invention with a centrifugal air blower comprising a reference peripheral wall that has a logarithm spiral shape as a shape in a cross section perpendicular to a rotary shaft of a fan, the curved peripheral wall is configured such that the distance L1 between the axis of a rotary shaft and the peripheral walls is, at a first end which is the boundary between the peripheral walls and the tongue section and a second end which is the boundary between the peripheral walls and the discharge part, equal to the distance L2 between the axis of the rotary shaft and the reference peripheral wall, the distance L1 is, between the first end and the second end of the peripheral wall, equal to or greater than the distance L2, and a plurality of expansion sections in each of which the length of the difference LH between the distance L1 and the distance L2 provides a maximum point are included between the first end and the second end of the peripheral wall. The flat peripheral wall is formed in at least a part of the curved peripheral wall.

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