Diaphragm pump with chip resistant valve seats and low...

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

Patent

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Details

F04B 43/067 (2006.01)

Patent

CA 2233938

A diaphragm pump is provided having a plurality of piston inlets connecting a hydraulic fluid source with the piston chamber and a plurality of check valves each having a ball and valve seat disposed within the inlets. The valve seat includes a conical section sloped such that the tangential contact point between the ball and valve seat is located at a position outward from the inner edge of the valve seat. The distance the ball is permitted to move between the open and closed positions is such that the check valve closes substantially in conjunction with the piston beginning its power stroke and the ball is not able to generate a high closure velocity. A diaphragm plunger includes a spherical surface portion designed to impact a diaphragm stop at a position away from the edges of the stop and plunger. An isolation reservoir is connected to a piston reciprocating chamber such that hydraulic fluid completely fills the piston reciprocating chamber and further flows into the isolation reservoir. A sliding valve includes a housing which has at least one elongated slot to permit the flow of hydraulic fluid into the piston chamber.

Pompe à membrane comportant plusieurs admissions de piston reliant la source de fluide hydraulique à la chambre à piston et plusieurs clapets anti-retour, comportant chacun un siège et une boule, placés dans les admissions. Le siège comprend une section conique dont la pente est conçue de telle sorte que le point de contact tangentiel entre la boule et le siège se situe en un point extérieur par rapport au bord intérieur du siège. La course autorisée de la boule entre les positions d'ouverture et de fermeture est telle que le clapet anti-retour se ferme essentiellement lorsque le piston commence sa poussée et que la boule n'est pas en mesure de produire une vitesse de fermeture élevée. Le plongeur de la membrane comporte une pièce à surface sphérique conçue pour heurter la butée de la membrane en position d'éloignement des rebords de la butée et du plongeur. Un réservoir d'isolement est relié à la chambre abritant le mouvement alternatif d'un piston, de telle sorte que le fluide hydraulique remplit entièrement cette chambre puis s'écoule dans le réservoir d'isolement. Le robinet-vanne comporte un logement présentant au moins une fente allongée permettant l'écoulement du fluide hydraulique dans la chambre à piston.

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