Patent ID: 6533622
Filing Date: 2003-03-18
Classification: B63H

Abstract:
A jet propulsion pump having a pump chamber, a shaft, a propeller mounted on the shaft for axial rotation, means to support the shaft for axial rotation with the propeller positioned within the pump chamber, an aperture in the pump chamber, and a downwardly inclined outlet connected to the aperture in the pump chamber, wherein the pump chamber comprises a cylindrical inlet located within the pump chamber and the propeller being mounted in the cylindrical inlet, an inner circumferential wall, an outwardly spiralling outer wall portion having an upper edge, the inner circumferential wall defining a space integral with the cylindrical inlet, the pump chamber further having a base wall, the inner circumferential wall and the outwardly spiralling outer wall portion having respective lower edges which are substantially horizontally aligned with one another and which are interconnected by the base wall, and an upper wall integral with the upper edge of the outwardly spiralling outer wall portion, the arrangement being such that, in use, fluid is lifted by the propeller into the pump chamber through the cylindrical inlet and then caused to flow radially along the upper wall and conjoining surfaces to pass through the aperture into the outlet.