Piston pump for oral douches

摘要

In a piston pump for oral douches, the piston pump of which, which is designed as an injection-moulded part, can be displaced, via a reducing gear and an eccentric drive, in a cylinder, arranged on the pump housing, with inlets and outlets for the pump medium, the cylinder is, in order to produce a wear-resistant pump cylinder with a smooth cylinder-wall surface, formed by a tubular piece (4) made of a material of great hardness and fixed undisplaceably on the pump housing (1) by a holding member (6) which can be connected to the pump housing (1), and the tubular piece (4) is supported in a sealed manner on the pump housing (1) by a sealing body (7) mounted on the end of the tubular piece (4) which is brought close to the inner end position of the pump piston. <IMAGE>