Patent ID: 6336788
Filing Date: 2002-01-08
Classification: F02M,F04D,F05B

Abstract:
A regenerative type pump apparatus, including an impeller having a plurality of blade grooves formed along a perimeter of the impeller and a pump casing for rotatably housing the impeller, the pump casing having an inlet port, a discharge port, a passage groove extending from the inlet port to the discharge port along a traveling path of the blade grooves of the impeller, and a partition formed between the inlet port and the discharge port,wherein an opening end face of the discharge port on a side of the impeller has a width tapered portion and a damping portion, the width tapered portion having an opening width that gradually decreases along a direction of rotation of the impeller, and the damping portion being continuous with a downstream side of the width tapered portion and having an opening width that is substantially constant along the direction of rotation of the impeller.