Multiple piston pump

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

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F04B 1/16 (2006.01) F04B 1/14 (2006.01) F04B 1/18 (2006.01) F04B 1/28 (2006.01) F04B 9/04 (2006.01) F04B 11/00 (2006.01)

Patent

CA 2213194

A reciprocating piston pump (10) provides pulseless delivery of liquid. It is suitable for use in compact environments or for the delivery of small amounts of liquid. The pump includes two pistons (18, 48) with pumping chambers that are alternately connected to inflow and outflow lines through a control valve (100). The control valve moves between a first position in which inflow is directed to the first piston chamber and outflow to the second piston chamber, and a second position in which outflow is directed to the first piston chamber and inflow is directed to the second piston chamber. A rotating cam (80) moves the pistons of the pump and the control valve between their operating positions described above. The cam rotates around an axis that is parallel to the axis of movement of the piston pumps. A control surface is carried by and rotated by the cam in one embodiment.

Pompe (10) à piston alternatif assurant le débit d'un liquide sans à-coups. Ladite pompe convient pour un usage en environnements compacts ou pour libérer de petites quantités de liquide. Elle comporte deux pistons (18, 48) avec des chambres de pompage reliées alternativement à des lignes d'admission et de décharge par un clapet de commande (100). Celui-ci se déplace entre une première position dans laquelle le flux d'admission est dirigé vers la première chambre de piston et le flux de décharge vers la seconde chambre de piston, et une seconde position dans laquelle le flux de décharge est dirigé vers la première chambre de piston et le flux d'admission vers la seconde. Une came rotative (80) fait se déplacer les pistons de la pompe et le clapet de commande entre les positions de fonctionnement décrites ci-dessus. Ladite came tourne autour d'un axe parallèle à l'axe de déplacement des pompes à piston. Dans un mode de réalisation, une surface de commande est supportée par la came, qui la fait tourner.

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