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Title:
LIQUID FEED DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/008617
Kind Code:
A1
Abstract:
A liquid feed device comprising: a primary-side plunger pump; a secondary-side plunger pump connected in series to the primary-side plunger pump downstream the primary-side plunger pump; a check valve provided between an outlet of the primary-side plunger pump and an inlet of the secondary-side plunger pump; a primary-side pressure sensor that communicates with a pump chamber of the primary-side plunge pump and that detects the pressure in the pump chamber of the primary-side plunger pump; a liquid feed control unit configured to control the operation of the primary-side plunger pump and the secondary-side plunger pump; and a leakage detection unit configured to detect a leak in the check valve on the basis of a change in an output value from the primary-side pressure sensor during an idle time in which the primary-side plunger pump is in stoppage without operating. The liquid feed control unit controls the operation of the primary-side plunger pump such that said idle time coincides with a period following the termination of a suction operation of the primary-side plunger pump while a discharge operation of the secondary-side plunger pump is in progress.

Inventors:
OGAWA Keisuke (1 Nishinokyo-kuwabaracho, Nakagyo-ku, Kyoto-sh, Kyoto 11, 〒6048511, JP)
IMAMURA Shinya (1 Nishinokyo-kuwabaracho, Nakagyo-ku, Kyoto-sh, Kyoto 11, 〒6048511, JP)
Application Number:
JP2017/024291
Publication Date:
January 10, 2019
Filing Date:
July 03, 2017
Export Citation:
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Assignee:
SHIMADZU CORPORATION (1 Nishinokyo-kuwabaracho, Nakagyo-ku Kyoto-sh, Kyoto 11, 〒6048511, JP)
International Classes:
F04B49/10; F04B1/16; F04B13/00; F04B53/00; G01N30/26
Domestic Patent References:
WO2017094097A12017-06-08
Foreign References:
JPH07133894A1995-05-23
Attorney, Agent or Firm:
NOGUCHI Daisuke (Noguchi Patent Office, Rapport Nanba Bldg. 9F 8-1, Motomachi 2-chome, Naniwa-ku, Osaka-sh, Osaka 16, 〒5560016, JP)
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