Portable air filtration device

Claim 1

A portable breathing assist comprising: an external housing, an internal scroll housing within the external housing, the scroll housing comprising a central plate mounted in said external housing and having a central inlet for air and a cup-like member having a tangential outlet for air mounted to said central plate concentrically with said central inlet, said tangential outlet extending through said external housing as well, breathing tube means connected to said outlet; a radial impeller rotatably mounted within the scroll housing for moving air from said inlet to said outlet, an electrical motor within said external housing but outside said scroll housing and having means connected to said impeller for rotating the same, the external housing defining at least one opening, filter means mounted over said at least one opening for filtering all air passing therethrough; air manifold means within said external housing, the air manifold defining a passageway for air from said at least one opening to said central inlet, along which air can travel without encountering said electrical motor, said air manifold means having a first portion of rectangular cross-section comprised of said inner plate having said central inlet therethrough, two substantially parallel side plates connected perpendicularly to said inner plate and an outer plate substantially parallel with said inner plate and connected to said side plates, said air manifold means having a second portion comprised of conduit means fluidically connecting said at least one opening to said first portion, the said motor being located on the other side of the cup-like member from the inner plate.