ACOUSTICALLY IMPROVED BLOWER PACKAGE

摘要

A housing is formed of a block of sound absorbing material of sufficient density to retain its form. A scroll-shaped chamber is formed in the block of sound absorbing material for locating a blower. A passage is formed in the housing which extends from an outer surface thereof to the scroll chamber. The passage forms a built-in muffler in the block of material. A diffuser is formed in the block of material which leads from the scroll chamber to an outer surface of the housing. A thin material coating is applied to the inner surfaces of the sound absorbing material block to prevent the material from eroding and to present a low friction surface to air passing thereover. A stiff outer shell surrounds the housing and has a good sound reflective characteristic. The shell has openings therein corresponding to the inlet opening of the muffler passage and the outlet opening of the diffuser.