LIQUID FEEDING PUMP AND LIQUID FEEDING METHOD

Title:

LIQUID FEEDING PUMP AND LIQUID FEEDING METHOD

Document Type and Number:

WIPO Patent Application WO/2021/149325

Kind Code:

A1

Abstract:

Provided is a technology for reducing the capacity of a liquid feeding pump and enabling liquid feeding with little pulsation. A liquid feeding pump according to the present disclosure is provided with: a first plunger pump having a first plunger; a second plunger pump having a second plunger and connected in series with the first plunger pump; a pressure sensor disposed downstream of the second plunger pump; and a control unit that accepts the input of a liquid discharge pressure measured by the pressure sensor and that controls the driving of the first plunger and the driving of the second plunger, wherein when the liquid is compressed by the first plunger pump, the control unit drives the first plunger at a first speed and then, before the compression is finished, reduces the speed to a second speed, which is slower than the first speed, and drives the second plunger concurrently with the driving of the first plunger, whereby the liquid is discharged from the second plunger pump.

Inventors:

TSUKADA NOBUHIRO (JP)
AKIEDA DAISUKE (JP)
HASHIMOTO YUICHIRO (JP)
IWASA SHO (JP)
YOTA YUSUKE (JP)

Application Number:

PCT/JP2020/041326

Publication Date:

July 29, 2021

Filing Date:

November 05, 2020

Export Citation:

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Assignee:

HITACHI HIGH TECH CORP (JP)

International Classes:

F04B23/06; F04B49/06; G01N30/32; G01N30/34

Domestic Patent References:

WO2005050190A2	2005-06-02
WO2018198234A1	2018-11-01

Foreign References:

JP2009053098A	2009-03-12
JP5624825B2	2014-11-12
JP2008291848A	2008-12-04

Other References: