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An electromagnetic fluid pump comprising an electromagnet motor unit for producing a magnetic field of reversing polarity to drive a fluid pump unit to pump fluid such as air. The fluid pump unit comprises a generally cup-shaped pump casing having its open end closed by a flexible diaphragm to defin

An electromagnetic fluid pump comprising an electromagnet motor unit for producing a magnetic field of reversing polarity to drive a fluid pump unit to pump fluid such as air. The fluid pump unit comprises a generally cup-shaped pump casing having its open end closed by a flexible diaphragm to define a fluid pumping chamber. A permanent magnet is mounted on the diaphragm, and the pump unit is mounted directly on the electromagnet motor unit with the permanent magnet and the electromagnet motor unit positioned at opposite ends of the fluid pumping chamber. In operation, the reversing magnetic field alternately repels and attracts the permanent magnet to displace the diaphragm to expand and contract the volume of the fluid pumping chamber. Expansion of the fluid pumping chamber draws fluid into the chamber through an inlet port including a one-way valve, and contraction of the fluid pumping chamber expels the fluid from the chamber through an outlet port including a one-way valve. In one alternative embodiment, the pump casing and the motor unit are movably mounted in a pump housing for reciprocating movement toward and away from the reciprocating permanent magnet to increase pump output, whereas in another alternative embodiment two of the fluid pumps are connected back-to-back for relatively vibration-free reciprocation of their permanent magnets in equal and opposite directions.

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An electromagnetic fluid pump, comprising: an electromagnet motor unit having an electromagnet with an E-shaped core and a coil fitting around a center leg of said core to be energized by a source of alternating current; and a pumping unit to be driven by said electromagnet motor unit, and comprisin

An electromagnetic fluid pump, comprising: an electromagnet motor unit having an electromagnet with an E-shaped core and a coil fitting around a center leg of said core to be energized by a source of alternating current; and a pumping unit to be driven by said electromagnet motor unit, and comprising: a cup-shaped plastic pump casing having an end wall disposed against said electromagnet, a side wall, an opening in its end opposite said end wall, and inlet and outlet ports opening into the interior of said casing, one-way valves permitting inlet and outlet fluid flows through said inlet and outlet ports, respectively, a flexible diaphragm secured to said casing over said opening at one end of the pump and cooperating with said casing to define a pumping chamber, at least one weight of a magnetizable material carried by said diaphragm, and a permanet magnet secured to said diaphragm to be reciprocated by said electromagnet from across said pumping chamber when the latter is energized, thereby alternating to attract and repel said permanent magnet to reciprocate said diaphragm in and out with respect to said pumping chamber to pump fluid through said chamber.