Reciprocating piston pump with bleed passages

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

Patent

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Details

F04B 53/12 (2006.01) F04B 47/02 (2006.01) F04B 49/035 (2006.01)

Patent

CA 2231643

A pump which has a piston (30) which is reciprocatingly moved inside a tubular housing (32) to extract fluid from the bottom of a well (29). The piston (30) is driven by motor (12) and has a horizontally extending base plate (50) with opening (52) provided with a plug/check valve (64). As the fluid is pumped, the plug (64) is raised and the fluid flows into a high pressure reservoir (35). When the pressure inside reservoir (35) exceeds a specified level, the base plate (50) is moved downward against an upward biasing force. This opens an annular port (51) exposing bleed ducts (56) and allows some fluid in reservoir (35) to flow back into low pressure chamber (37). Grooves (43) are also provided on the peripheral surface of base plate (50) for allowing small amounts of fluid to continuously escape from the reservoir (35) as long as pressure in the reservoir (35) is higher than in low pressure chamber (37). This allows the pump to idle at start-up and starts the pump smoothly, as well as preventing overpressure conditions.

L'invention concerne une pompe comprenant un piston (30) qui se déplace en va-et-vient à l'intérieur d'un corps tubulaire (32) pour extraire le fluide du fond d'un puits (29). Le piston (30) est commandé par un moteur (12) et présente une plaque de base (50) s'étendant dans le sens horizontal, comprenant une ouverture (52) dotée d'une soupape à boisseau/unidirectionnelle (64). A mesure que le fluide est pompé, le boisseau (54) monte et le fluide s'écoule dans un réservoir haute pression (35). Lorsque la pression à l'intérieur du réservoir (35) dépasse un niveau spécifié, la plaque de base (50) descend à l'encontre d'une force de sollicitation par ressort ascendante, ce qui ouvre un orifice annulaire (51) qui expose les conduits de désaération (56) et permet à une certaine quantité de fluide contenu dans le réservoir (35) de refluer dans la chambre basse pression (37). Des rainures (43) prévues sur la surface périphérique de la plaque de base (50) permettent à des petites quantités de fluide de s'échapper du réservoir (35) en continu tant que la pression dans le réservoir (35) est supérieure à celle dans la chambre basse pression (37). Ainsi, cela permet à la pompe de marcher au ralenti au démarrage et démarrer doucement, et d'empêcher les surpressions.

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