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Electromagnetic oscillating fluid pump

Electromagnetic oscillating fluid pump description/claims

This application is a continuation-in-part of U.S. patent application Ser. No. 10/957,585, filed Oct. 5, 2004.

The present invention relates to pumps, and more particularly to electromagnetically driven oscillating pumps.

Electromagnetic oscillating pumps are well known in the art. Typically, an electromagnetic coil is utilized to move an armature carried by an impeller relative to the frame assembly of the pump. Upon energization, a bellows-shaped discharge end of the impeller, defining a discharge chamber, is compressed, thereby decreasing the volume of the discharge chamber. This decrease in volume forces the liquid inside the chamber out of the pump through a one-way discharge valve.

Upon de-energization, a spring or permanent magnet returns the impeller to its original position or beyond, thereby increasing the volume of the discharge chamber. As a result, a partial vacuum is created inside the discharge chamber, and liquid is drawn from an inlet end of the impeller, past a center valve, and into the discharge chamber. The electromagnetic coil is then re-energized and the cycle is repeated, thereby producing a stop-and-go flow in one direction.

Currently, the oscillating pumps known in the art use alternation of magnetic polarity as the returning force. Han's U.S. Pat. No. 5,501,581, for example, discloses an electromagnetic oscillating pump using a valve pivotedly connected to a magnetic cylinder. Due to cylindrical shape of the magnetic cylinder, the valve must be connected at substantially single one pivoting point. Under a situation of frequently and periodically movement, the pivot between the valve and magnetic cylinder must tend to fail because of its structural weakness. Furthermore, such pumps as Han must be utilized in a specific direction, which is horizontal with pivot upward just as shown in his drawings. Therefore, the pump disclosed by Han is less useful.

A primary object of the present invention is to provide an electromagnetic oscillating fluid pump, which can be employed in any direction without limits.

Another object of the present invention is to provide an electromagnetic oscillating fluid pump, which avoids using pivoting connection between valve and piston for extending durability.

FIG. 1 is a longitudinal cross section of an electromagnetic oscillating fluid pump according to one preferred embodiment of the present invention showing the pump in a static status;

FIG. 2 is a longitudinal cross section showing a first motion status; and

FIG. 3 is a longitudinal cross section showing a second motion status.

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• Utility Patent

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