Reciprocating piston pump operating on pressure medium

Abstract

The present invention relates to a reciprocating piston pump comprising: at least one cylinder with an inlet for a pressure medium; a piston slidable in the cylinder between a first and a second position, and forming a pressure chamber in the cylinder; a first valve member which is received in the piston and which in an open position mutually connects the cylinder spaces on either side of the piston; a second valve member which is received in the piston and which in an open position connects a pressure medium passage formed in the piston to an outlet of the pump; a resilient member urging the piston in the first position; an actuating member connected to the valve members and which are embodied such that in the first position the first valve member is closed and the second valve member is opened and in the second position the first valve member is opened and the second valve member is closed, wherein the piston is moved to the second position by the pressure medium.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. § 119 to application serial number 07075373.6 filed in the European Patent Office on May 15, 2007 entitled “RECIPROCATING PISTON PUMP OPERATING ON PRESSURE MEDIUM,” which is incorporated by reference into the instant application as if set forth verbatim.FIELD OF THE INVENTION[0002]The present invention relates generally to pumps, and more particularly to reciprocating piston pumps operated with a pressure medium.BACKGROUND OF THE INVENTION[0003]Existing reciprocating piston pumps are used to transport a medium from a pump inlet connected to a tank to a pump outlet opening. These pumps are driven by a motor that slidably moves a piston of the pump in the cylinder, thereby forming a pressure chamber in the cylinder. By opening and closing valves at the appropriate times, the pressurized fluid is propelled out of the pump. However, existing pumps require separate motors and connecting m...

AI Technical Summary

Benefits of technology

[0018]A fluid, like water, used for the pressure medium would allow for movement of the piston in the cylinder. Furthermore, as the piston is moved due to the resilient means, the fluid is transported to the pump outlet and preferably mixed with one or two other media like, for example, soap concentrate. Such soap concentrate may constitute of a mix of various chemicals with a rather large variation of molecular weight. This concentrate may be taken from a storage tank. Typically, after a relatively short period of time, such as about 5 minutes, it is possible to distinguish an upper part of, for example, 60% low density concentrate and a lower part of, for example, 40% higher density concentrate. To achieve a consistent outflow of soap at the pump outlet such a mixture must reflect the differences in density of the soap concentrate. In the example mentioned here, 60% of the soap concentrate has to be taken from the upper part by the t

Problems solved by technology

However, existing pumps require separate motors and connecting

Images