Shimadzu Corporation

Shinichi Fujisaki

Jun Yanagibayashi

Shinya Imamura

Keisuke Ogawa

Masataka Nikko

A binary pump includes a switching valve that can be switched to a state (first state or second state) in which only one of a first pump part and a second pump part is connected to an output part, and a state (third state) in which both the first pump part and the second pump part are connected to the output part, and has a function of preventing a backflow of liquid by switching a state of the switching valve, in particular, a function of preventing a backflow of liquid when liquid delivery is performed by using both the first pump and the second pump.

Binary pump and liquid chromatograph provided with same

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 Lunder an atmospheric pressure of a flow rate Lof the mobile phase discharged to the discharge channel from the pump part becomes a set flow rate Lusing a volume V of the mobile phase in the pump chamber of the closing pump immediately before the precompression process is started, a volume &#x394;V 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.

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Kyoto, Japan

Shinichi Fujisaki