Pump, pump for liquid chromatography, and liquid chromatography apparatus
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United States of America Patent
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Mar 13, 2007
Grant Date -
Mar 24, 2005
app pub date -
Jul 30, 2004
filing date -
Sep 18, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The invention provides a pump for liquid chromatography excellent in feeding liquid stably at an extremely low flow rate and in discharging bubbles at startup.In a pump for liquid chromatography including a cylinder and a plunger that reciprocates in the cylinder to suck and discharge fluid, the pump further includes a large-flow-rate pump that feeds liquid by the plunger, a small-flow-rate pump that feeds the liquid by the plunger, motion conversion means that converts the rotational motion of a motor to a reciprocating motion, an actuator that directly drives the plunger, and a drive part that drives the actuator, and selectively switches means for driving the plunger.
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