Diaphragm pump, particularly for the generation of vacuum

US3947156A · kind A · utility

Inventor

• Erich Becker · Springe, DE

Key dates

• Filing date: May 16, 1974
• Grant date: Mar 30, 1976
• Expiry date: May 16, 1994

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B45/04
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A diaphragm pump, especially a vacuum pump, in which a diaphragm of elastomeric material is clamped at its outer peripheral portion against a peripheral portion of a rigid wall which has, radially inwardly of the clamped portion, a concavely curved spherical surface forming with the diaphragm a pumping chamber with which inlet and outlet ports, each provided with a one-way valve, communicate. A central substantially rigid portion of the diaphragm is moved between a suction stroke increasing the volume of the pumping chamber, and a compression stroke. The wall surface and the diaphragm are constructed and arranged relative to each other that the volume of the pumping chamber is reduced substantially to zero at the end of the compression stroke and so as to permit easy sliding movement of portions of the diaphragm and the surface of the wall as the diaphragm approaches the end of the compression stroke.