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US 12,497,954 B2Granted
Compact volumetric pump
AssigneeDana Italia S.R.L.
InventorsMichelangelo Marini, Matteo Dallapiccola, Pier Paolo Rinaldi
Life of this patent
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Abstract
Methods and systems for a mechanically driven pump are provided. The mechanically driven pump may apply a piston simultaneously to operate as a guillotine blocking valve and a component to transfer motive force. A spring may apply a force to the piston to oppose a force that is applied to the piston via a cam lobe. The mechanically driven pump exhibits a differential pressure at a calibrated orifice during two working phases of the pump (expansion and compression), which provides for a non-zero volumetric efficiency of the mechanically driven pump.
Claims18
A pump, comprising:
- a spring;
- a piston configured to receive the spring;
- a pump body including a cylindrical cavity configured to receive the spring;
- a cylindrical protrusion positioned within the cylindrical cavity, the cylindrical protrusion having outer sides that are straight and vertical along a longitudinal cross-section of the cylindrical protrusion and a top side with a flat surface, the outer straight vertical sides and the top side enclosing a second cylindrical cavity, the top side thicker than the outer straight vertical sides, the top side offset from a top of the cylindrical cavity so that the cylindrical protrusion is positioned entirely inside the spring except for a first gap at a first portion of the spring which is level with a top end of the spring and a second gap at a second portion of the spring which is level with a bottom end of the spring when the piston is seated in the pump body;
- and
- an outlet port positioned at the top side of the cylindrical protrusion;
- wherein the outer straight vertical sides of the cylindrical protrusion are parallel to inner straight vertical sides of a bore of the pump along a longitudinal cross-section of the bore.
4 more elements
A method for a pump, comprising:
- rotating a cam lobe to move a piston and selectively extend and compress a spring according to a position of the cam lobe relative to the piston, wherein the spring and the piston are configured to slide over a cylindrical protrusion during operation of the pump, the cylindrical protrusion positioned within a cylindrical cavity of a pump body and having outer sides that are straight and vertical along a longitudinal dimension of the cylindrical protrusion and a top side with a flat surface, the outer straight vertical sides and the top side enclosing a second cylindrical cavity, the top side thicker than the outer straight vertical sides, the top side offset from a top of the cylindrical cavity so that the cylindrical protrusion is positioned entirely inside the spring except for a first gap at a first portion of the spring which is level with a top end of the spring and a second gap at a second portion of the spring which is level with a bottom end of the spring when the piston is seated in the pump body, and wherein an outlet port is positioned at the top side of the cylindrical protrusion;
- and
- pumping a liquid through the outlet port positioned at the top side of the cylindrical protrusion while blocking a flow of the liquid via the piston.
A self-priming pump, comprising:
- a cam lobe;
- a spring;
- a piston configured to receive the spring and interact with the cam lobe;
- a pump body including a cylindrical cavity configured to receive the spring;
- a cylindrical protrusion positioned within the cylindrical cavity and having outer sides that are straight and vertical along a longitudinal dimension of the cylindrical protrusion and a top side with a flat surface, the outer straight vertical sides and the top side enclosing a second cylindrical cavity, the top side thicker than the outer straight vertical sides, the top side offset from a top of the cylindrical cavity so that the cylindrical protrusion is positioned entirely inside the spring except for a first gap at a first portion of the spring which is level with a top end of the spring and a second gap at a second portion of the spring which is level with a bottom end of the spring when the piston is seated in the pump body;
- and
- an outlet port positioned at the top side of the cylindrical protrusion.
4 more elements
Dependencies are inferred from the claim text.