Diaphragm pump with noise intercepting insert

US4993925A · kind A · utility

Assignee

• KNF Neuberger GmbH · DE

Inventors

• Erich Becker · Springe, DE
• Heinz Riedlinger · Glückstadt, DE

Key dates

• Filing date: Nov 13, 1989
• Grant date: Feb 19, 1991
• Expiry date: Nov 13, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B43/02
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A diaphragm pump wherein that side of the diaphragm which faces away from the pumping chamber is adjacent a noise intercepting insert. The insert is traversed by the connecting rod of the drive which oscillates the central portion of the diaphragm to draw a fluid into and to expel the drawn fluid from the pumping chamber. A deformable wall of the insert has a marginal portion which is attached to the housing, and this wall is separated from the diaphragm by an elastic distancing cushion of foam rubber or other sound absorbing material. The cushion can constitute a ring or it can consist of a set of projections which are affixed to or integral with the wall and face of the diaphragm. The cushion is compressed between the head of the connecting rod and the wall so that the latter is maintained in stressed condition. The stress upon the wall is selected in such a way that the wall does not perform natural oscillations in response to oscillations which are carried out by the diaphragm as a result of pressure changes in the pumping chamber.