Piston pump for a high-pressure cleaning appliance

Abstract

A piston pump for a high-pressure cleaning appliance is provided, including a plurality of pump chambers into each of which one piston which is movable back and forth plunges, and which are each in flow connection via a suction valve with a suction inlet and via a pressure valve with a pressure outlet, the pistons each being surrounded by a sealing ring which is supported in the radial direction by a ring wall and in the axial direction by a support ring. In order to develop the piston pump in such a way that it can be manufactured and assembled more cost-effectively, it is proposed that the piston pump includes a one-piece support shield which forms the support rings and surrounds the ring walls in the circumferential direction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of international application number PCT / EP2012 / 050867, filed on Jan. 20, 2012, which is incorporated herein by reference in its entirety and for all purposes.BACKGROUND OF THE INVENTION[0002]The invention relates to a piston pump for a high-pressure cleaning appliance, comprising a plurality of pump chambers into each of which one piston which is movable back and forth plunges, and which are each in flow connection via a suction valve with a suction inlet and via a pressure valve with a pressure outlet, the pistons each being surrounded by a sealing ring which is supported in the radial direction by a ring wall and in the axial direction by a support ring.[0003]A liquid, preferably water, can be pressurized and directed at an article to be cleaned or a surface to be cleaned by means of such piston pumps. For this purpose, the pistons can be reciprocatingly driven, for example, by means of a swash plate, ...

AI Technical Summary

Benefits of technology

This patent is about a new piston pump design that simplifies assembly and reduces material usage while maintaining high mechanical stability. The design features a one-piece support shield that includes all of the support rings that support the sealing rings around each piston in the circuit. This support shield is supported by a guide shield that guides the pistons and acts as a cover for the swash plate housing. This configuration increases the mechanical stability of the guide shield and reduces its material thickness. The guide shield also functions to cover the swash plate housing where a swash plate is located, and the pistons interact with the swash plate to change the volumes of the pump chambers.

Problems solved by technology

Furthermore, the relatively high material thickness has the consequence that the housing of the piston pump, which is usually manufactured in a casting process, undergoes a lengthy cooling process during the manufacture, which limits the production rate of the housing.

This also increases the manufacturing costs of the piston pump.

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