US 4,592,700 AGranted

Vortex pump

AssigneeEbara Corporation

InventorsSeiichi Toguchi, Makoto Kobayashi

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Abstract

A vortex pump is provided wherein an impeller is of an open type and plural blades are grouped into two or more groups, the axial width of each group of blades being different from the others so that the blades belonging to a certain group extend into a vortex chamber so as to directly drive the liquid in the vortex chamber while relatively large pieces of foreign matter are permitted to pass through the pump.

Claims8

Dependent claims

A vortex pump comprising:

a pump casing consisting of an impeller chamber and a vortex chamber communicating with said impeller chamber, said vortex chamber being provided with a suction opening at a portion opposite said impeller chamber and a discharge opening, said impeller chamber and said suction opening being axially aligned;
a motor supported on said casing and having a shaft, the distal end of which extends into said impeller chamber in axially aligned relation therewith;
and
an impeller of an open type having a main plate and plural blades on one side of said main plate and mounted on said distal end of said shaft so as to be disposed in said impeller chamber so that said blades face said suction opening;
said vortex pump being characterized in that:
said plural blades are grouped into at least two groups, one being a group of wide blades and the other being a group of narrow blades, the axial width of each of said wide blades being broader than the axial width of each of said narrow blades so that the open end edges of said wide blades extend into said vortex chamber, each of the blades being shaped to have an open end edge comprising a parallel portion parallel to said main plate and a slanted portion inclined upwardly from a region near the center of the impeller toward said parallel portion, said wide and narrow blades being arranged circumferentially while keeping an equiangular relationship with each other so as to provide a dynamic and hydraulic balance to said impeller, the number and configuration of the wide and narrow blades being selected and determined so that a flow passage is formed from said suction opening to said discharge opening through said vortex chamber to allow the passing of a sphere having a diameter equivalent to the distance between the open end edges of said narrow blades and the inner surface of the wall of said vortex chamber provided with said suction opening, whereby any foreign material sucked into the suction opening is discharged out of the suction opening, the inclined angle of said slanted portion relative to said main plate being greater in the said wide blade than the inclined angle in said narrow blade.

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Dependencies are inferred from the claim text.

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Abstract

A vortex pump comprising:

a pump casing consisting of an impeller chamber and a vortex chamber communicating with said impeller chamber, said vortex chamber being provided with a suction opening at a portion opposite said impeller chamber and a discharge opening, said impeller chamber and said suction opening being axially aligned;
a motor supported on said casing and having a shaft, the distal end of which extends into said impeller chamber in axially aligned relation therewith;
and
an impeller of an open type having a main plate and plural blades on one side of said main plate and mounted on said distal end of said shaft so as to be disposed in said impeller chamber so that said blades face said suction opening;
said vortex pump being characterized in that:
said plural blades are grouped into at least two groups, one being a group of wide blades and the other being a group of narrow blades, the axial width of each of said wide blades being broader than the axial width of each of said narrow blades so that the open end edges of said wide blades extend into said vortex chamber, each of the blades being shaped to have an open end edge comprising a parallel portion parallel to said main plate and a slanted portion inclined upwardly from a region near the center of the impeller toward said parallel portion, said wide and narrow blades being arranged circumferentially while keeping an equiangular relationship with each other so as to provide a dynamic and hydraulic balance to said impeller, the number and configuration of the wide and narrow blades being selected and determined so that a flow passage is formed from said suction opening to said discharge opening through said vortex chamber to allow the passing of a sphere having a diameter equivalent to the distance between the open end edges of said narrow blades and the inner surface of the wall of said vortex chamber provided with said suction opening, whereby any foreign material sucked into the suction opening is discharged out of the suction opening, the inclined angle of said slanted portion relative to said main plate being greater in the said wide blade than the inclined angle in said narrow blade.

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