Piston pump

Abstract

The invention relates to a piston pump whose piston (4), via its upper and lower piston faces, delimits the working space inside the pump cylinder (5) on both sides. The working space (c) is joined via a lever system (19, 22, 25, 28, 31) to two force-guided inlet valves (14, 16) and two force-guided outlet valves (10, 12) that each alternately open and close for filling or discharging the working volume upon reaching both final positions of the piston. An additional working volume, which is reduced by the volume portion of the piston rod, is obtained by the piston being acted upon twice per working stroke as described by the invention thus nearly doubling the efficiency and resulting in a delivery flow with few pulsations. A small residual pulsation remains only from the short period of time during which the valves change from open to closed upon reaching both end positions of the piston inside the cylinder. According to the invention, the design of the piston pump makes it possible for two or more piston pumps to be synchronously operated by coupling their drive levers (31, 40) to a common piston rod (35) and that, in doing this, different stroke lengths can be set by modifying the lever ratios.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This is a 371 national phase application of International Application No. PCT / CH2004 / 000327 filed 01 Jun. 2004, which claims priority to Swiss Application Number 1169 / 03 filed 02 Jul. 2003, the contents of which are incorporated herein by reference.FIELD OF THE INVENTION [0002] The invention is with regard to a piston pump with a pump casing and a piston that narrows the working chamber in a pump cylinder through an elevating motion, in accordance with the preamble of patent claim 1. The invention preferably deals with a piston pump to convey or meter fluid media of the most varied nature. BACKGROUND OF THE INVENTION [0003] Piston pumps are generally established in a multiplicity of design versions and serve the most varied conveying or driving requirements (hydraulics). Piston pumps established in process engineering utilize only one front surface of the piston to fill and eject the pump medium. This results in unwanted pulsation which...

AI Technical Summary

Benefits of technology

[0005] The task of the invention, therefore, is to make a piston pump of the type initially described available, which is low on pulsation and functions efficiently with just one piston, possesses positively controlled suction and pressure valves and has a simple, compact design.

Problems solved by technology

In the case of a crank assembly, the supply stream is however sinusoidal with a negative impact on the Net Positive Suction Head NPSH.

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