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AssigneeHitachi High-Tech Corporation
InventorsNobuhiro Tsukada, Daisuke Akieda, Sho Iwasa, Yusuke Yota, Yuichiro Hashimoto
Estimating the term…
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. The control unit calculates the rate of change in the pressure of the liquid on the basis of the past compression distances of the plunger for when the liquid was compressed by the first plunger pump and the pressure at the completion of compression, predicts the compression distance of the first plunger on the basis of the rate of change in pressure and the present discharge pressure, and determines the timing at which the compression performed by the first plunger will be completed on the basis of the predicted compression distance.
A liquid feeding pump comprising:
A liquid feeding method performed by a control unit that controls a liquid fed by a liquid feeding pump, the liquid feeding pump including a first plunger pump including a first plunger, a second plunger pump including a second plunger and connected to the first plunger pump in series, and a single pressure sensor disposed downstream from the second plunger pump and measuring a discharge pressure of a liquid of the second plunger pump, the method comprising:
Dependencies are inferred from the claim text.