Patent ID: 11965526
Assignee: WEIR MINERALS AUSTRALIA LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 8:
9. The combination of claim 8 wherein the outer face of the front shroud of the impeller includes an outer region, an inner region and an intermediate region therebetween, the intermediate region being in a plane at right angles to the impeller rotation axis (X-X) and the inner region being inclined towards the pumping vanes; and wherein the surface of the second side of the pump front side part includes an outer region, the inner region and an intermediate region between the outer region of the second side and the inner region of the second side, the inner region of the pump front side part extending in a direction away from the intermediate region and in a direction away from the first side of the side wall section of the pump front side part and following the inner region of the outer face of the impeller front shroud, and
wherein the outer face of the impeller shroud and the surface of the second side of the pump front side part are arranged in use to be facing one another with a gap therebetween, the gap having an outer gap opening and an inner gap opening, the surface of the second side of the side wall section of the pump front side part being configured so that the cross-sectional dimension of the gap increases in a direction toward the impeller rotation axis (X-X) in the intermediate region of the second side of the pump front side part, and the inner region of the second side of the pump front side part terminates at the inner gap opening.