High pressure pump for fine liquid metering

US5653876A · kind A · utility

Inventor

• Herbert Funke · Krailling, DE

Key dates

• Filing date: Jun 11, 1995
• Grant date: Aug 5, 1997
• Expiry date: Jun 11, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B53/164
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In order to reduce the overall size of serial pump arrangements, several block-disk-like building elements are used. These building elements are made of a non-metallic material and lie against each other with their control surfaces in a sandwich like stack. Two of the block-disk-like building elements have displacement chambers oriented transversely to the axis of the stack, in each of which is guided a push piston. Inflow and outflow bores in which the high pressure mass flow, for example a chemical buffer, is created, extend parallel to the stack axis. Both building elements form two serially arranged pumping units of the serial pump arrangement and ensure a constant and continuous mass flow. Check valves are provided at the suction and delivery sides of both pumping units. Besides saving space, this arrangement ensures a highly constant and continuous mass flow, as the throughflow paths are as short as possible. The building elements may be made of metal-free but highly stable materials, including sapphire. Because of their shortness a minimal dead volume is obtained, and because of the metal-free materials there is practically no elasticity.