AIR SUPPLY UNIT

摘要

Air supply capacity, silent properties, and the like, can be sustained at higher levels as compared with the prior art when a reduced scroll chamber is designed. In an air supply unit designed such that the dimensions of a spiral scroll chamber (20) letting air flow generated by a fan (4) pass are enlarged in the radial and axial directions, enlargement ratio of cross-sectional area of the scroll chamber (20) varies to become larger in the range of first winding angle ? or above than the enlargement ratio in the range smaller than the first winding angle ?, and the axial dimension of the scroll chamber (20) is enlarged in the range of first winding angle ? or above.