Cutter apparatus for centrifugal pump

摘要

A centrifugal pump with a cutter mechanism consisting of a toothed cutter rotor, integral with the impeller wear ring, affixed to the impeller and a toothed cutter stator affixed to the casing, separately from the casing wear ring. A cutter mechanism consisting of a stator and rotor set such that they may be installed on the centrifugal pump impeller and casing as original equipment or as a retrofit. A cutter mechanism such that when installed in a centrifugal pump they prevent stringy materials, garbage and other agglomerated soft wastewater solids from partially restricting or totally blocking the inlet to the pump impeller. A cutter mechanism such that when it prevents solids from restricting or blocking the impeller inlet, it does so without significant decrease of flow throughput or significant increase in absorbed hydraulic horsepower.

主权项

1. A cutter device for a centrifugal pump, comprising:
an impeller concentrically located in a volute of the centrifugal pump, the volute having a front wall with a front annular flange defining an inlet port, said impeller having a rotational axis about which said impeller rotates within the volute, said impeller having an inlet end that extends into and sits concentrically within the front annular flange, said inlet end including a notch; a cutter ring releasably attached to said impeller, said cutter ring concentric with said impeller and including a first set of teeth extending inwards towards the rotational axis of said impeller, said cutter ring including a projection machined to fit into said notch as a keyed engagement between said cutter ring and said impeller; a wear ring about said cutter ring between said cutter ring and the volute; a stationary cutter plate releasably attached to the volute, concentric with and adjacent to said cutter ring, said stationary cutter plate including a plate ring and including a second set of teeth having at least one tooth extending inwards from the plate ring towards the rotational axis of said impeller, said second set of teeth being in shearing communication with said first set of teeth to shear apart solids in the inlet port of the volute.