Multi-stage diaphragm suction pump

US9004877B2 · kind B2 · utility

Assignee

• KNF Neuberger GmbH · DE

Inventors

• Erich Becker · Springe, DE
• Erwin Hauser · Emmendingen, DE

Key dates

• Filing date: Aug 18, 2010
• Grant date: Apr 14, 2015
• Expiry date: Oct 13, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B45/047
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A multi-stage diaphragm suction pump, includes at least two pump chambers, each having a inlet having at least one inlet valve, and a outlet having at least one outlet valve, and a suction line, which connects the fluid inlets of the pump chambers. Successive pump chambers are connected to one another by at least one connection line such that, when a differential pressure in the suction line is reached/exceeded, the diaphragm pump changes from parallel to an operating mode that is at least also serial. At least one check valve, which opens to a downstream pump stage, is interposed in each of the inflow and outflow regions of the at least one connection line. A suction-side opening or a pressure-side opening of the connection line is arranged in a region of the pump chamber on which a diaphragm associated with the pump chamber rolls first during a pump cycle.