A movable magnet type pump, wherein a magnet moving body having at least one axially magnetized permanent magnet and an axially extending through liquid passage is arranged so as to be slidable inside a liquid introducing chamber; a plurality of coils are fixed so as to enclose the liquid introducing chamber; a first check valve is arranged on a liquid introducing side of the liquid introducing chamber; a second check valve is arranged on a liquid discharge side of the through liquid passage; and the magnet moving body is caused to reciprocate by interaction between current applied to the respective coils and magnetic flux from the magnet moving body cutting across the respective coils. Magnetic pumpsA movable magnet type pump comprising: a magnet moving body having at least one axially magnetized permanent magnet and an axially extending liquid passage extending from an upstream end of said magnet moving body to a downstream end of said magnet moving body, Suber-water pumpsthe magnet moving body being disposed within a liquid introducing chamber so as to be slidable therewithin; a plurality of coils being fixed so as to enclose the liquid introducing chamber; a first check valve being disposed on a liquid passage communicating with the liquid introducing chamber; a second check valve being disposed on the axially extending liquid passage of the magnet moving body and including a valve seat at a downstreammost end surface of said magnet moving body at which said magnet moving body terminates, said valve seat including a downstreammost opening, and wherein said second check valve includes a valve body closure member which is larger than said downstreammost opening of said valve seat; the movable magnet type pump further including a discharge member having a discharge path therein, and wherein said valve body closure member is disposed between said downstreammost opening of said valve seat and said discharge path of said discharge member, said discharge member located downstream of said magnet moving body, and wherein the valve body closure member is between the downstreammost end surface of the magnet moving body and the discharge path of the discharge member; wherein the magnet moving body includes at least two permanent magnets having like poles which confront each other and wherein the magnet moving body is caused to reciprocate by interaction between current applied to each of the plurality of coils and magnetic flux from the magnet moving body cutting across each of the plurality of coils.

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2011-12-30

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