Liquid delivery device

A technology of liquid feeding device and side pump, which is applied in pump device, measuring device, liquid variable capacity machine, etc., can solve problems such as flow change

Active Publication Date: 2018-05-11
SHIMADZU SEISAKUSHO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After the suction operation of the primary side pump for liquid suction is completed, immediately switch the suction and discharge operations of the primary side pump and the secondary side pump. The pressure in the pump chamber of the pump is low, so the check valve does not open until the pressure in the pump chamber of the primary side pump becomes higher than the pressure in the pump chamber of the secondary side pump, resulting in flow fluctuation (pulsating flow)

Method used

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Embodiment Construction

[0027] A preferred embodiment of the liquid delivery device of the present invention is further comprising: an acquisition frequency data holding unit for distributing the acquisition frequency and the acquisition frequency of signals acquired from the primary side pressure sensor and the secondary side pressure sensor to the preloading operation during the preloading operation. The relationship between the length of the preload time of the operation is held as the fetch frequency data; the fetch frequency determination unit determines the preload time based on the fetch frequency held by the fetch frequency data holding unit when the preload time is determined by the preload time determiner. The acquisition frequency is determined based on the data, and the preload operation unit is configured to acquire signals from the primary side pressure sensor and the secondary side pressure sensor at the acquisition frequency determined by the acquisition frequency determination unit.

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Abstract

The liquid delivery device has a primary-side pump and a secondary-side pump, wherein an outlet part of the primary-side pump and an inlet part of the secondary-side pump are connected together via acheck valve. The device is provided with a primary-side pump pressure sensor for detecting the pressure in a pump chamber of the primary-side pump and a secondary-side pressure sensor for detecting the pressure in a pump chamber of the secondary-side pump, and is configured so as to capture a signal from the primary-side pressure sensor, and a signal from the secondary-side pressure sensor, aftera suction operation of the secondary-side pump ends and before a discharge operation of the primary-side pump ends, and to execute a preload operation on the basis of the captured signals such that the primary-side pump is driven toward the discharge side until the pressure in the pump chamber of the primary-side pump becomes substantially the same as the pressure in the pump chamber of the secondary-side pump. The amount of time to be allocated for the preload operation is determined on the basis of a predetermined liquid delivery flow rate, and the capture frequency is determined on the basis of prepared capture frequency data when the preload time is determined by a preload time determination part.

Description

technical field [0001] The invention relates to a liquid delivery device using two plunger pumps for liquid delivery. Background technique [0002] As a liquid-feeding device for liquid-feeding a mobile phase in a liquid chromatograph, there is a device in which two plunger pumps are connected in series. A check valve is installed between the plunger pump (primary pump) on the front stage and the plunger pump (secondary pump) on the rear stage, and the check valve is opened while the primary pump is discharging liquid. , the liquid from the primary side pump is sent via the secondary side pump. While the primary side pump is discharging liquid, the secondary side pump is performing liquid suction operation, and a part of the liquid discharged from the primary side pump is sucked by the secondary side pump. Liquid is sent at the flow rate of the discharge flow rate of the side pump minus the suction flow rate of the secondary side pump. [0003] After the discharge operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B13/00
CPCF04B1/02F04B11/0075F04B13/00F04B23/06F04B49/065G01N30/36G01N2030/326F04B11/0058F04B17/03F04B49/20
Inventor 今村信也
Owner SHIMADZU SEISAKUSHO CO LTD
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