High Speed Internal Gear Pump

摘要

This document discloses an internal gear pump with a symmetrical casing and a head design that enables high pumping speeds, reduced turbulence and reduced risk or occurrence of cavitation. The head includes a boss that extends into the pump chamber to form an idler support and a crescent support. The crescent support includes a liquid directing step that extends from the crescent arcuately towards the inlet. The liquid directing step divides liquid incoming from the inlet into a portion directed to an idler feed slot and another portion directed to a rotor feed slot. The idler feed slot provides communication between the inlet and the roots of the idler and the rotor feed slot provides communication between the inlet and spaces between the rotor teeth.

主权项

1. An internal gear pump comprising:
a casing comprising an inlet, an outlet, an open outboard end and an inboard end through which a rotor shaft passes, the open outboard end enclosed by a head, the head and casing defining a pump chamber, the rotor shaft connected to a rotor disposed in the pump chamber, the head including an inner surface that faces the pump chamber, the inner surface connected to a boss that extends into the pump chamber, the boss comprising an idler support connected to a crescent support, the idler support rotatably connected to an idler, the crescent support partially covered by and connected to a crescent that extends away from the head and that is disposed below the idler, the crescent support further comprising a liquid directing step that extends from the crescent and towards the inlet, the boss comprising a lower wall disposed below the crescent support and that extends from the crescent support downward to the casing, the boss, inner surface of the head and casing defining a rotor feed slot between the liquid directing step and the casing and extending from the lower wall towards the inlet for providing communication between the inlet and the rotor.