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US 5,244,361 AGranted
Pump for reverse osmosis system
AssigneeProduct Research and Development
InventorDonald F. Solomon
Life of this patent
Estimating the term…
Abstract
A pump connectible to fluid under pressure comprising a housing having a cavity and a differential area piston reciprocable in the cavity on pumping and reset strokes and dividing the cavity into an inlet chamber, an outlet chamber and a reversing chamber. The housing has an inlet port communicating with the inlet chamber and connectible to the fluid under pressure, a water port communicating with the outlet chamber and a reversing port communicating with the reversing chamber. The piston has a passage leading from the inlet chamber to the outlet chamber. A first valve opens and closes the passage and a second valve is provided in the housing. A cam assembly opens and closes the first and second valves as a function of the position of the piston in the cavity.
Claims20
A pump connectible to a source of fluid under pressure comprising:
- a housing having a cavity and a differential area piston reciprocable in the cavity on pumping and reset strokes and dividing the cavity into an inlet chamber, an outlet chamber and a reversing chamber, said piston having an inlet face in the inlet chamber, an outlet face in the outlet chamber and a reversing face in the reversing chamber, said inlet face being of larger area than the outlet face;
- said housing having an inlet port communicating with the inlet chamber and connectible to the source of fluid under pressure, a water port communicating with the outlet chamber and a reversing port communicating with the reversing chamber;
- said piston having a passage leading from the inlet chamber to the outlet chamber;
- a first valve for opening and closing said passage;
- and
- a cam assembly for opening and closing said first valve as a function of the position of the piston in the cavity.
3 more elements
A pump connectible to a source of fluid under pressure comprising:
- a housing having a cavity and a differential area piston reciprocable in the cavity on pumping and reset strokes and dividing the cavity into an inlet chamber, an outlet chamber and a reversing chamber, said piston having an inlet face in the inlet chamber, an outlet face in the outlet chamber and a reversing face in the reversing chamber, said inlet face being of larger area than the outlet face;
- said housing having an inlet port communicating with the inlet chamber and connectible to the source of fluid under pressure, a water port communicating with the outlet chamber and a reversing port communicating with the reversing chamber, said piston being movable on the pumping stroke by the fluid under pressure;
- a reset spring for urging the piston to move on the reset stroke;
- an elongated member in said housing, said elongated member having first and second cam surfaces;
- a carrier coupled to the piston for movement with the piston;
- a cam follower carried by the carrier;
- means for resiliently biasing the cam follower toward the elongated member;
- said cam follower cooperating with the first cam surface during an initial portion of the pumping stroke to store energy in the biasing means;
- said cam follower cooperating with the second cam surface near the end of the pumping stroke for providing valve operating motion to at least one of the carrier and the elongated member;
- and
- a first valve carried by the housing and operable in response to said valve operating motion, the operation of the first valve at least assisting in causing the piston to reverse.
8 more elements
A pump connectible to a source of fluid under pressure comprising:
- a housing having a cavity and a differential area piston reciprocable in the cavity on pumping and reset strokes and dividing the cavity into an inlet chamber, an outlet chamber and a reversing chamber, said piston having an inlet face in the inlet chamber, an outlet face in the outlet chamber and a reversing face in the reversing chamber, said inlet face being of larger area than the outlet face;
- said housing having an inlet port communicating with the inlet chamber and connectible to the source of fluid under pressure, a water port communicating with the outlet chamber and a reversing port communicating with the reversing chamber, said piston being movable on the pumping stroke by the fluid under pressure;
- a reset spring for urging the piston to move on the reset stroke;
- means for storing energy during an initial portion of the pumping stroke;
- means driven by the stored energy near the end of the pumping stroke for providing valve operating motion;
- and
- a first valve carried by the housing and operable in response to said valve operating motion, the operation of the first valve at least assisting in causing the piston to reverse.
4 more elements
A pump connectible to a source of fluid under pressure comprising:
- a housing having a cavity and a differential area piston reciprocable in the cavity on pumping and reset strokes and dividing the cavity into an inlet chamber, an outlet chamber and a reversing chamber, said piston having an inlet face in the inlet chamber, an outlet face in the outlet chamber and a reversing face in the reversing chamber, said inlet face being of larger area than the outlet face;
- said housing having an inlet port communicating with the inlet chamber and connectible to the source of fluid under pressure, a water port communicating with the outlet chamber and a reversing port communicating with reversing chamber, said piston being movable on the pumping stroke by the fluid under pressure;
- a reset spring for urging the piston to move on the reset stroke;
- an energy storage device for storing energy during an initial portion one of said strokes, the energy storage device releasing the stored energy near the end of said one stroke for providing valve operating motion;
- and
- a first valve operable in response to said valve operating motion to at least assist in causing the piston to reverse.
3 more elements
Dependencies are inferred from the claim text.