Pump, pump for liquid chromatography, and liquid chromatography apparatus
First Claim
1. A pump including a cylinder and a plunger that reciprocates in the cylinder to suck and discharge liquid comprising:
- a motor;
motion conversion means that converts a rotational motion of the motor to a reciprocating motion and drives the plunger;
an actuator that drives the plunger by more minute displacement than the motion conversion means;
a drive part that drives the actuator, anda controller that selectively switches between operation of the motor and operation of the drive part.
1 Assignment
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Accused Products
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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Citations
15 Claims
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1. A pump including a cylinder and a plunger that reciprocates in the cylinder to suck and discharge liquid comprising:
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a motor; motion conversion means that converts a rotational motion of the motor to a reciprocating motion and drives the plunger; an actuator that drives the plunger by more minute displacement than the motion conversion means; a drive part that drives the actuator, and a controller that selectively switches between operation of the motor and operation of the drive part. - View Dependent Claims (2, 3, 4)
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5. A pump including a cylinder and a plunger that reciprocates in the cylinder to suck and discharge liquid, comprising:
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a first pump having a first cylinder and a first plunger reciprocating in the first cylinder; and a second pump having a second cylinder, a second plunger reciprocating in the second cylinder, a motor, motion conversion means that converts a rotational motion of the motor to a reciprocating motion and drives the second plunger, an actuator that drives the second plunger by more minute displacement than the motion conversion means, and a drive part that drives the actuator; and a controller that selectively switches between operation of the first pump and operation of the second pump, and, at the same time, selectively switches, within the first pump, between operation of the motor and operation of the drive part, wherein, a flow rate of liquid is greater in the first pump than in the second pump. - View Dependent Claims (6, 7)
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8. A pump for liquid chromatography including a cylinder and a plunger that reciprocates in the cylinder to suck and discharge liquid, comprising:
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a motor; motion conversion means that converts a rotational motion of the motor to a reciprocating motion and drives the plunger; an actuator that directly drives the plunger by more minute displacement than the motion conversion means; a drive part that drives the actuator; and a controller that selectively switches between operation of the motor and operation of the drive part. - View Dependent Claims (9)
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10. A pump for liquid chromatography including a cylinder and a plunger that reciprocates in the cylinder to suck and discharge liquid, comprising:
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a first pump having a first cylinder and a first plunger reciprocating in the first cylinder; and a second pump having a second cylinder, a second plunger reciprocating in the second cylinder, a motor, motion conversion means that converts a rotational motion of the motor to a reciprocating motion and drives the second plunger, an actuator that drives the second plunger by more minute displacement than the motion conversion means; and
a drive part that drives the actuator; anda controller that selectively switches between operation of the first pump and operation of the second pump, and, at the same time, selectively switches, within the first pump, between operation of the motor and operation of the drive part, wherein, a flow rate of liquid is greater in the first pump than in the second pump. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification