Electromagnetically driven diaphragm pump
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United States of America Patent
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Jul 6, 2004
Grant Date -
N/A
app pub date -
Jun 20, 2002
filing date -
Jun 20, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump (10) has a housing which forms a pump chamber (17) having a wall (18). Inlet and outlet valve assemblies (19, 20) communicate with the chamber (17) and, respectively, allow fluid to be received in, and discharged from, the chamber (17). An armature (27) carries a plunger (28) and is reciprocatably moved by an electromagnetic coil assembly (25). A coil spring (44) biases the plunger (28) toward a stop surface (41) positioned adjacent to the plunger (28). Upon activation of the coil assembly (25), the plunger. (28) is moved against the force of the spring (44) such that a diaphragm (31) carried by the plunger (28) moves into the chamber (17) without engaging the wall (18) to discharge fluid through the outlet valve assembly (20). When the coil assembly (25) is deactivated, the spring (44) moves the plunger (28) toward the stop surface (41) without allowing it to engage the stop surface (41) to draw fluid in through the inlet valve assembly (19). In another embodiment, a second coil spring (45) is positioned so as to bias the plunger (28) away from the stop surface (41) to prevent the plunger (28) from engaging the stop surface (41) during priming of the pump (10).
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