초록 ▼

A centrifugal slurry pump is disclosed which includes a specifically designed impeller having three circumferentially spaced vanes mounted between a back disc shaped shroud and a front open annular shroud. The vanes are thick in cross-section for wear-resistance and channels formed between adjacent

A centrifugal slurry pump is disclosed which includes a specifically designed impeller having three circumferentially spaced vanes mounted between a back disc shaped shroud and a front open annular shroud. The vanes are thick in cross-section for wear-resistance and channels formed between adjacent ones of the vanes permit a relatively large sphere, or sphere-like objects, to pass therethrough, the sphere having a diameter of in excess of 14 inches, while maintaining an efficiency in excess of 80% and a head in excess of 30 feet. The vanes have a mixed pitch and a negative overlap, with quite large channels formed between adjacent vanes so as to pass the large spheres which are encountered during dredging operations.

대표청구항 ▼

[ We claim:] [1.] A centrifugal pump adapted to pump a slurry of water and solids therethrough, said pump comprising:a shell in the form of a semi-volute collector formed about a central axis, said shell having:a substantially circular front wall and a spaced substantially circular back wall;a gener

[ We claim:] [1.] A centrifugal pump adapted to pump a slurry of water and solids therethrough, said pump comprising:a shell in the form of a semi-volute collector formed about a central axis, said shell having:a substantially circular front wall and a spaced substantially circular back wall;a generally continuous outer side wall extending between said front wall and said rear wall;a discharge nozzle disposed tangentially with respect to said side wall;a discharge opening at a terminal end of said discharge nozzle;a circular suction inlet defined in said front wall about said axis for allowing the slurry to enter said shell;an impeller rotatably supported within said shell about said central axis, said impeller including:a circular back shroud;a spaced parallel annular shroud; anda plurality of vanes each having a proximal end fastened to said back shroud, a spaced distal end fastened to said annular shroud, a leading edge extending between said proximal and distal ends and inclined in a direction of said impellers' path of rotation about said axis, and a spaced trailing edge, said vanes being equally spaced from each other and defining impeller channels therebetween;a circular opening defined by said annular shroud about said central axis in fluid communication with said suction inlet, said circular opening having a diameter approximately equal to the diameter of said suction inlet; anda central shaft rotatably supported on said shell and extending along said axis, said shaft being operably engaged with said back shroud for rotating said impeller about said axis;wherein said proximal end of each vane extends along an arc of approximately 105.degree. from said trailing edge to said leading edges said distal end of each vane extends along an arc of approximately 80.degree. from said trailing edge to said leading edge, and each respective one of said impeller channels is sized and shaped to pass at least one of the solids therethrough.