Adjustable rotary pump with reduced wear

摘要

A rotary pump having a variable delivery volume, including: a casing; a delivery chamber formed in the casing; at least one delivery rotor which is rotatable in the delivery chamber; an actuating member which is arranged facing a front face of the delivery rotor or surrounds the delivery rotor, and is moveable in the casing for adjusting the delivery volume; the actuating member chargeable with an actuating force which is dependent on a fluid requirement; a track which is formed in the casing and guides the actuating member on an actuating member sliding surface in a sliding contact; and a sliding material which forms at least one of the track and the actuating member sliding surface.

主权项

1. A rotary pump having a variable delivery volume, comprising:
a casing; a delivery chamber formed in the casing and comprising an inlet for a fluid on a low-pressure side and an outlet for the fluid on a high-pressure side of the pump; at least one delivery rotor which can be rotated in the delivery chamber about a rotational axis; a first actuating member which is arranged facing a front face of the delivery rotor, and can be moved back and forth in the casing for adjusting the delivery volume; the first actuating member being chargeable, in the direction of its mobility, with an actuating force which is dependent on a fluid requirement; a first track which is formed in the casing and guides the first actuating member on a first actuating member sliding surface in a sliding contact; a sliding material which forms at least one of the first actuating member sliding surface and the first track; the first actuating member, a second actuating member and the delivery rotor are part of an adjusting unit which can be moved as a whole back and forth in the casing; the first and second actuating members are each arranged facing one of the front faces of the delivery rotor, and a second track is formed in the casing which guides the second actuating member on its second actuating member sliding surface in a sliding contact; at least one of the second actuating member sliding surface of the second actuating member and the second track consists of the sliding material; wherein the sliding material is a thermoplastic modified with a lubricant; wherein the sliding material is a polymer compound of at least one heat-resistant polymer filled with carbon fibers and a sliding additive comprising at least one of graphite and fluoropolymer.