Self-priming pump

US10544795B2 · kind B2 · utility

Assignee

• GEA Tuchenhagen GmbH · DE

Inventors

• Stephan Dirks · Hamburg, DE
• Markus Pawlik · Bergneustadt, DE

Key dates

• Filing date: Mar 11, 2016
• Grant date: Jan 28, 2020
• Expiry date: May 16, 2036

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04D29/62
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A self-priming pump is described that has a housing, an inlet, and an outlet. A first impeller has a first pump section that is arranged in a first chamber, and a second impeller has a second pump section that is arranged in a second chamber. A shaft section is provided between the pump sections, and has a shaft end and penetrates an opening in a housing wall. To improve the net positive section head of the pump, the shaft section between a constriction and the shaft end is formed to taper from the shaft end toward the constriction, and the first impeller and shaft section between the constriction and first pump section has a smooth contour.