Cylinder piston arrangement for a fluid pump or a fluid engine

F - Mech Eng,Light,Heat,Weapons – 04 – B

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Details

F04B 53/10 (2006.01) F04B 53/02 (2006.01) F04B 43/08 (2006.01)

Patent

CA 2657348

The invention relates to a cylinder piston arrangement for an especially volumetric fluid pump or a fluid motor, preferably comprising at least one axial expansion tubular membrane piston defining at least one inner pulsating working chamber. A particular field of application for such pumps or motors is the operation thereof with fluids loaded with extraneous materials, especially abrasive granulated materials. Especially high-speed machines with high working pressures of between a few hundred to a thousand bar are required, the energetic and also volumetric degree of efficiency thus becoming highly important factors. The aim of the invention is therefore to create pumps or fluid motors which are characterised by high degrees of efficiency and long service lives. To this end, at least one clearance driving body (TK1) is actively connected to the pulsating working chamber (AR).

L'invention concerne un système cylindre-piston pour une pompe hydraulique ou un moteur hydraulique, notamment de type volumétrique, qui comprend de préférence au moins un piston à membrane tubulaire à extension axiale, qui délimite au moins une chambre de travail à pulsation, située à l'intérieur. L'invention se caractérise en ce qu'un domaine d'application essentiel de pompes ou de moteurs de ce type est l'exploitation avec des fluides chargés en corps étrangers, en particulier des granulats abrasifs, ce qui requiert des machines à grand rendement, avec des pressions de service de l'ordre de quelque centaines à un millier de bars. La question du rendement, tant énergétique que volumétrique, revêt alors beaucoup d'importance. L'invention vise par conséquent à mettre au point des pompes ou des moteurs hydrauliques se caractérisant à la fois par des rendements élevés et par de longues durées de vie. A cet effet, il est prévu selon l'invention au moins un corps de réduction d'espace mort (TK1), qui coopère avec la chambre de travail à pulsation.

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