Abstract: An improved centrifugal impeller having between 20 and 26 rearwardly curved blades blades, a ratio of blade annulus width to wheel radius between 0.31 and 0.37, and an inlet blade angle in the range 32° to 36° and a discharge blade angle in the range 36° to 40°.

Abstract: A high speed centrifugal air impeller assembly with rearwardly curved blades has it impeller backplate directly cooperating with an adjacent housing wall portion to provide a narrow annular sound attenuating passageway from an impeller chamber to a motor and discharge chamber.

Abstract: A light-weight electric motor driven fluid pump assembly having a molded thermoplastic housing of two parts which form a fluid impervious rotor chamber, a stationary shaft journalled in the housing parts within the chamber and carrying a magnetic rotor and a fluid impeller driven thereby. The housing parts also define inlet and discharge ports in communication with the rotor chamber adjacent the impeller blades. One portion of the housing of one housing part defines a cylindrical thin walled tubular configuration with a cylindrical exterior surface for mounting a stator thereabout. The housing parts are welded together at mating surfaces with the result that neither static nor dynamic seals are required in the assembly.

Abstract: An axial flow fan comprises a hub rotatable on a central axis and a plurality of radial blades extending from the hub, each having a root portion adjacent the hub and each having tip portion space radially from the hub and surrounded by an annular band. The root portions are substantially equally spaced circumferentially at their junctions with the hub and at least some of the tip potions are substantially unevenly space circumferentially. The latter is due to the condition that blade centerlines are pivoted through unequal angles about points along the junctions between the hub and the blade root portions.

Abstract: An improved centrifugal impeller having between 20 and 26 rearwardly curved blades blades, a ratio of blade annulus width to wheel radius between 0.31 and 0.37, and an inlet blade angle in the range 32° to 36° and a discharge blade angle in the range 36° to 40°.

Abstract: A light-weight electric motor driven fluid pump assembly having a molded thermoplastic housing of two parts which form a fluid impervious rotor chamber, a stationary shaft journalled in the housing parts within the chamber and carrying a magnetic rotor and a fluid impeller driven thereby. The housing parts also define inlet and discharge ports in communication with the rotor chamber adjacent the impeller blades. One portion of the housing of one housing part defines a cylindrical thin walled tubular configuration with a cylindrical exterior surface for mounting a stator thereabout. The housing parts are welded together at mating surfaces with the result that neither static nor dynamic seals are required in the assembly.

Abstract: An axial flow air impeller for automotive radiator fan use and the like comprising a hub carrying a plurality of integrally formed similar circumaxially spaced and generally radially outwardly projecting air moving blades. Each blade has a root end portion integral with the hub and a radially outwardly disposed tip end portion with smoothly curving leading and trailing edges extending therebetween. The leading edge curves substantially forwardly while the trailing edge extends substantially radially to provide for a blade projected width at the tip end portion approximately 40% greater than at the root end portion. The thickness of each blade varies from a maximum at the root end portion to a minimum at the tip end portion with the latter being at least three times the thickness at the blade edge. An integral orifice ring circumscribes the plurality of blades and has a bell mouth at its upstream or downstream end.