Electromagnetic drive type plunger pump

Details Electromagnetic drive type plunger pump Electromagnetic drive type plunger pump

2006-08-22

2006-08-22

Freay, Charles G. (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

Reexamination Certificate

active

07094041

ABSTRACT:
With structure comprising a cylinder, a magnetic circuit to exert a mountain-shaped thrust, and a feeding spring to exert an urging force to a plunger during a feeding process, fuel is sucked by movement of the plunger and energy is accumulated in the feeding spring during a powering state, the fuel is fed by movement of the plunger by the urging force of the feeding spring during a non-powering state, a spring constant of the feeding spring is set to generate an urging force larger than a thrust in an early range of the mountain-shaped thrust, and a second spring is disposed to exert an urging force in a direction against the urging force of the feeding spring to make the urging force smaller than the thrust, at least in the early range. In this manner, with an electromagnetically driven type plunger pump of a non-powering feeding type, an effective stroke is enlarged and a feeding amount is increased.

REFERENCES:
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patent: 4343597 (1982-08-01), Brown
patent: 4389169 (1983-06-01), De Dionigi
patent: 6413057 (2002-07-01), Hong et al.
patent: 6942470 (2005-09-01), Versini
patent: 2003/0017064 (2003-01-01), Kawahara et al.
patent: 57-97191 (1982-06-01), None
patent: 1-318768 (1989-12-01), None

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