Reciprocating pumps with linear motor driver
First Claim
1. A reciprocating pump for liquids, said pump comprising:
- a cylinder including outer walls providing a closed interior compartment having opposed ends, a piston assembly having a dispensing end and an opposed end, said piston assembly being movably mounted within said compartment for movement in opposed linear directions between the opposed ends of the closed interior compartment, a sealing member between said piston assembly and said cylinder to maintain a dynamic fluid seal between the piston assembly and said cylinder as said piston assembly is moved in opposed linear directions between said opposed ends of said closed interior compartment, said sealing member separating said interior compartment into a dispensing chamber and a reservoir chamber;
a linear magnetic drive generating a linearly moving magnetic field for moving the piston assembly in said opposed linear directions;
a valve-controlled inlet conduit communicating with the dispensing chamber of the interior compartment for directing liquid into the dispensing chamber to fill the volume of the dispensing chamber as the piston assembly moves through a swept volume in one linear direction through a liquid-receiving suction stroke;
a valve-controlled outlet conduit communicating with the dispensing chamber of the interior compartment for directing pumped liquid out of the dispensing chamber as the piston assembly is moved through a swept volume in a direction opposed to said one linear direction through a liquid dispensing stroke, an energy storage and release media for storing energy as a result of the movement of the piston assembly through the suction stroke and for releasing the stored energy to said piston assembly as the piston assembly is moved through said dispensing stroke.
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Accused Products
Abstract
A reciprocating pump includes a cylinder with a closed interior compartment. A piston assembly has a dispensing end and an opposed end and is moveably mounted within the compartment for reciprocating movement in opposed linear directions between opposed ends of the closed interior compartment. A linear magnetic drive generates a linearly moving magnetic field for moving the piston assembly in opposed linear directions through a swept volume in each of said opposed linear directions, one of said linear directions being a dispensing stroke and the other of said linear directions being a suction stroke. A sealing member is provided between the cylinder and the piston assembly to divide the interior compartment of the cylinder into a dispensing chamber and a reservoir chamber. A valve-controlled inlet conduit communicates with the dispensing chamber from which liquid is dispensed and a valve-controlled outlet conduit communicates with the dispensing chamber for directing pumped liquid out of the interior compartment as the piston assembly is moved through the swept volume in a dispensing stroke. An energy storage and release media communicates with the reservoir chamber for storing energy as a result of movement of the piston assembly in a direction away from the dispensing end of the interior compartment and for releasing the stored energy as the piston assembly is moved in a direction toward the dispensing end of the interior compartment. In certain preferred embodiments, the pumps are hermetic and the energy storage and release media includes a gaseous substance in the reservoir chamber. Methods of pumping liquids with the pumps of this invention also constitute a part of the present invention.
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Citations
34 Claims
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1. A reciprocating pump for liquids, said pump comprising:
- a cylinder including outer walls providing a closed interior compartment having opposed ends, a piston assembly having a dispensing end and an opposed end, said piston assembly being movably mounted within said compartment for movement in opposed linear directions between the opposed ends of the closed interior compartment, a sealing member between said piston assembly and said cylinder to maintain a dynamic fluid seal between the piston assembly and said cylinder as said piston assembly is moved in opposed linear directions between said opposed ends of said closed interior compartment, said sealing member separating said interior compartment into a dispensing chamber and a reservoir chamber;
a linear magnetic drive generating a linearly moving magnetic field for moving the piston assembly in said opposed linear directions;
a valve-controlled inlet conduit communicating with the dispensing chamber of the interior compartment for directing liquid into the dispensing chamber to fill the volume of the dispensing chamber as the piston assembly moves through a swept volume in one linear direction through a liquid-receiving suction stroke;
a valve-controlled outlet conduit communicating with the dispensing chamber of the interior compartment for directing pumped liquid out of the dispensing chamber as the piston assembly is moved through a swept volume in a direction opposed to said one linear direction through a liquid dispensing stroke, an energy storage and release media for storing energy as a result of the movement of the piston assembly through the suction stroke and for releasing the stored energy to said piston assembly as the piston assembly is moved through said dispensing stroke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
- a cylinder including outer walls providing a closed interior compartment having opposed ends, a piston assembly having a dispensing end and an opposed end, said piston assembly being movably mounted within said compartment for movement in opposed linear directions between the opposed ends of the closed interior compartment, a sealing member between said piston assembly and said cylinder to maintain a dynamic fluid seal between the piston assembly and said cylinder as said piston assembly is moved in opposed linear directions between said opposed ends of said closed interior compartment, said sealing member separating said interior compartment into a dispensing chamber and a reservoir chamber;
Specification