Title:
LIQUID FEED DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/245767
Kind Code:
A1
Abstract:
Provided is a liquid feed device that has a simple configuration and can effectively suppress pulsation. This liquid feed device comprises: a first pump and a second pump which are pumps that have a pump head, a pump chamber formed inside the pump head, and a plunger inserted into the pump chamber in a reciprocative manner and that are connected to a discharge flow passage; a strain sensor that detects, as a fluid pressure in the pump chamber, a stress received by the plunger from the pump chamber in a suction operation in which the plunger reciprocates in the pump chamber and thereby the first pump or the second pump suctions a fluid, or in a discharge operation in which the plunger reciprocates in the pump chamber and thereby the fluid suctioned by the first pump or the second pump is discharged to a discharge flow passage; and a control device having a discharge control unit that, immediately before the other pump terminates the discharge operation, raises the fluid pressure of the pump chamber in the suction operation detected by the strain sensor in one pump to the fluid pressure of the pump chamber in the discharge operation detected by the strain sensor of the other pump, thereby controlling the discharge operation by the one pump.
Inventors:
NAKAMURA SATOSHI (JP)
SHIMIZU TAKAFUMI (JP)
SHIMIZU TAKAFUMI (JP)
Application Number:
PCT/JP2020/021690
Publication Date:
December 09, 2021
Filing Date:
June 02, 2020
Export Citation:
Assignee:
FLOM CORP (JP)
International Classes:
F04B23/06; F04B13/00
Foreign References:
| JP2012031817A | 2012-02-16 | |||
| JP2005090410A | 2005-04-07 | |||
| JP2009180617A | 2009-08-13 | |||
| JP2001254684A | 2001-09-21 |
Attorney, Agent or Firm:
WAKUI Kenichi et al. (JP)
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