公开(公告)号：US11905946B2

公开(公告)日：2024-02-20

申请号：US16183806

申请日：2018-11-08

Applicant: Shimadzu Corporation

Inventor： Toshiki Sano ,  Shinya Imamura ,  Masataka Nikko

IPC: F04B53/02 ,  F04B53/14 ,  F04B53/16 ,  F04B17/00 ,  F04B19/22

CPC classification number: F04B53/143 ,  F04B17/00 ,  F04B19/22 ,  F04B53/02 ,  F04B53/162

Abstract: A backup ring is for contacting with and supporting a plunger seal which is for sealing a pump chamber provided in a pump head of a plunger type liquid feeding pump. The backup ring includes a maximum outer diameter portion of a cylindrical shape and a smaller outer diameter portion. The maximum outer diameter portion includes a maximum outer diameter in a plunger seal supporting surface side that makes contact with a rear surface of the plunger seal. The smaller outer diameter portion includes a smaller outer diameter than the maximum outer diameter portion in at least one part of a portion other than the maximum outer diameter portion.

公开(公告)号：US11327056B2

公开(公告)日：2022-05-10

申请号：US16639432

申请日：2017-09-12

Applicant: SHIMADZU CORPORATION

Inventor： Masataka Nikko

IPC: G01N30/32 ,  F04B19/04 ,  G01L9/04

Abstract: A plunger pump includes, independently of a pump head, a pressure detection apparatus independently having a sensor part for detecting a fluid pressure, and the pump head and the pressure detection apparatus are detachably mounted with a communication member sandwiched between them. Therefore, when the pressure detection apparatus fails, only the pressure detection apparatus can be replaced, and the pump head can be used as it is without replacement.

公开(公告)号：US11307179B2

公开(公告)日：2022-04-19

申请号：US16648077

申请日：2017-10-23

Applicant: SHIMADZU CORPORATION

Inventor： Jun Yanagibayashi ,  Shinya Imamura ,  Keisuke Ogawa ,  Masataka Nikko ,  Shinichi Fujisaki

IPC: G01N30/32 ,  F04B49/20 ,  G01N30/34 ,  F04B23/06 ,  F04B49/06 ,  B01D15/16 ,  F04B11/00 ,  G01N30/02

Abstract: The liquid feeding device includes a discharge speed calculation part configured to calculate a discharge speed v of the plunger pump so that a converted value LATM under an atmospheric pressure of a flow rate LPRE of the mobile phase discharged to the discharge channel from the pump part becomes a set flow rate LSET using a volume V of the mobile phase in the pump chamber of the closing pump immediately before the precompression process is started, a volume ΔV reduced due to the precompression process of the mobile phase in the pump chamber of the closing pump, and a feeding pressure P; and a discharge operation controller configured to control a discharge speed of the plunger pump to a discharge speed v calculated by the discharge speed calculation part.

公开(公告)号：US12105069B2

公开(公告)日：2024-10-01

申请号：US17438421

申请日：2019-10-16

Applicant: SHIMADZU CORPORATION

Inventor： Tomohiro Gomi ,  Daisuke Kitabayashi ,  Shinya Imamura ,  Keisuke Ogawa ,  Masataka Nikko ,  Masahide Gunji

IPC: G01N30/86 ,  G01N30/02 ,  G01N30/32

CPC classification number: G01N30/8658 ,  G01N30/32 ,  G01N2030/027

Abstract: A liquid sending failure detector acquires periodically a liquid sending pressure of a liquid sending mechanism consecutively sends liquid using at least one plunger pump that sends liquid by reciprocally driving a plunger such that a fluctuation is read in one driving period of the liquid sending mechanism, and detect a liquid sending failure of the liquid sending mechanism using an acquired liquid sending pressure. The liquid sending failure detector executes a pulsation detection step of obtaining a fluctuation range of the liquid sending pressure in a certain driving period of the liquid sending mechanism and detecting pulsation on a condition that a count of consecutive periods in which the fluctuation range exceeds a predetermined reference value exceeds a predetermined reference count, and a liquid sending failure detection step of detecting a liquid sending failure of the liquid sending mechanism when the pulsation is detected in the pulsation detection step.