A volumetric pump comprising a driving mechanism

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

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F04B 7/00 (2006.01) F04B 19/02 (2006.01)

Patent

CA 2653981

A volumetric pump comprises at least one piston (1) inside a cylindrical housing (2) and means to cause a relative to-and-fro linear movement between the cylindrical housing (2) and the piston (1) in order to produce a stroke of the volumetric pump. This pump further comprises a bi-directional angular rotatable disc (4) acting as a valve which connects alternately at least one inlet port and at least one outlet port (5, 5') to a least one pump chamber (6, 6') located inside the housing (2), and a driving mechanism arranged to dissociate at least partially the bi-directional angular movement of the rotatable disc (4) with the to-and-fro linear movement of the housing (2). This driving mechanism is arranged such that the rotatable disc (4) reaches an angular position at which it opens and/or closes the inlet and/or outlet ports (5, 5') when there is no relative to-and-fro linear movement between the cylindrical housing (2) and the piston (1).

L'invention concerne une pompe volumétrique comportant au moins un piston (1) à l'intérieur d'une enveloppe cylindrique (2) et un moyen de provoquer un mouvement relatif linéaire alterné entre l'enveloppe cylindrique (2) et le piston (1) afin de donner une course de la pompe volumétrique. Ladite pompe comporte en outre un disque rotatif (4) angulaire bidirectionnel faisant fonction de soupape qui relie alternativement au moins un orifice d'entrée et au moins un orifice de sortie (5, 5') à au moins une chambre (6, 6') de pompe située à l'intérieur de l'enveloppe (2), ainsi qu'un mécanisme d'entraînement agencé de façon à dissocier au moins partiellement le mouvement angulaire bidirectionnel du disque rotatif (4) du mouvement linéaire alterné de l'enveloppe (2). Ledit mécanisme d'entraînement est agencé de telle sorte que le disque rotatif (4) atteigne une position angulaire dans laquelle il ouvre et / ou ferme les orifices d'entrée et / ou de sortie (5, 5') lorsqu'il n'existe aucun mouvement relatif linéaire alterné entre l'enveloppe cylindrique (2) et le piston (1).

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