LIQUID FEED PUMP AND LIQUID FEED METHOD

Japanese Patent JP2023158680

A

To determine a disturbance without acquiring a control signal of an external device and to properly perform feedback control on a compression rate parameter.SOLUTION: A controller of a liquid feed pump calculates a first compression amount of a solvent by a first plunger in one drive cycle based on a compression rate parameter, controls so that the first plunger compresses the solvent with the first compression amount in the one drive cycle. In the case where a value regarding a pressure value measured by a pressure sensor in the one drive cycle is smaller than a threshold value (S305:No, S311:No), the compression rate parameter is changed according to the value regarding the pressure value (S306, S312), and based on the compression rate parameter after change, a second compression amount of the solvent by the first plunger in the next drive cycle is calculated. In the case where a value regarding the pressure value in the one drive cycle is larger than the threshold value (S305:Yes, S311:Yes), based on the compression rate parameter, a third compression amount of the solvent by the first plunger in the next drive cycle is calculated.SELECTED DRAWING: Figure 3

JPH07167106	HYDRAULIC DEVICE
JPH0343679	ADJUSTING VALVE FOR HYDRAULICALLY ADJUSTABLE CONTROL PUMP
JPS56143380	COOLING WATER CONTROLLER FOR MULTISTAGE COMPRESSOR

KAWABE SHUNSUKE
TSUKADA NAGAHIRO
SUGIYAMA MASUYUKI
HARADA YUJI
KANAI DAISUKE

JP2022068588A

October 31, 2023

April 19, 2022

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HITACHI HIGH TECH CORP

F04B49/08; G01N30/32

Patent Attorney Corporation Hiraki International Patent Office

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