Patent ID: 9726160
Date: 2017-08-08
CPC Classifications: F04B

Claim:
1. A fluid pump comprising: a housing defining a first cavity and a second cavity in fluid communication with the first cavity, a volumetric displacement of the first cavity being different than a volumetric displacement of the second cavity, the housing having an outlet for discharging fluid out of the outlet; first and second pistons fixedly attached to each other, the first piston slideably seated within the first cavity, the second piston slideably seated within the second cavity, the first and second pistons collectively defining a secondary chamber which increases and decreases during reciprocal movement of the first and second pistons within the first and second cavities due to the different volumetric displacements of the first and second cavities, the outlet being in fluid communication with the secondary chamber, the first and second pistons are traversable between a compression stroke and a suction stroke for respectively enlarging and reducing a volume of a pumping chamber; a one-way valve formed in the second piston interconnecting the pumping chamber and the secondary chamber for flowing fluid from the pumping chamber to the secondary chamber during the compression stroke and stopping fluid flow between the pumping and secondary chambers during the suction stroke; a spring mounted between the first and second pistons and an electrical coil mounted to the housing for traversing the first and second pistons in the compression and suction strokes; and an orifice of the housing for flowing fluid into or out of a tertiary chamber defined by the first piston and the housing; wherein the electrical coil is disposed about the first cavity, and the spring is disposed about a shaft within the first cavity.