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Liquid feeding device and fluid chromatograph

A liquid sending device and liquid sending technology, which are applied in the field of fluid chromatography, and can solve the problems of reduced liquid sending flow rate and reduced stability of liquid sending flow rate, etc.

Active Publication Date: 2020-02-18
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this state, if the discharge pump is switched from the secondary plunger pump to the primary plunger pump, the liquid will not be discharged from the primary plunger pump until the pressure in the pump chamber of the primary plunger pump rises. When the pressure reaches the same pressure as the system pressure, the liquid delivery flow rate temporarily decreases as a result, and the stability of the liquid delivery flow rate decreases.

Method used

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  • Liquid feeding device and fluid chromatograph
  • Liquid feeding device and fluid chromatograph
  • Liquid feeding device and fluid chromatograph

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] First, use Figure 5 An example of a liquid chromatograph as one of fluid chromatographs will be described.

[0044] The liquid chromatograph 100 includes a liquid delivery device 1 , an analysis channel 102 , a sample injection unit 104 , an analysis column 106 , and a detector 108 . The liquid delivery device 1 is used to deliver the mobile phase in the analysis channel 102 . The sample injection unit 104 injects the sample into the analysis channel 102 , for example, by an autosampler. Analytical column 106 is arranged downstream of sample injection part 104 on analysis flow path 102, and is used to separate the sample injected into analysis flow path 102 through sample injection part 104; The analytical column 106 on the flow path 102 is further downstream, and is used to detect the sample components separated by the analytical column 106 .

[0045] In the analysis flow path 102 , a portion upstream of the analysis column 106 is at a high pressure (a pressure hig...

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Abstract

A liquid feeding device is provided with a discharge rate calculation unit configured to use the volume V of a mobile phase inside a pump chamber of a closed pump just before starting a pre-compression stroke, the volume delta(V) of the mobile phase inside the pump chamber of the closed pump after being decreased by the pre-compression stroke, and a liquid feeding pressure P, and obtain a plungerpump discharge rate v at which a conversion value LATM, under atmospheric pressure, of the flow rate LPRE of the mobile phase discharged to a discharge flow passage from a pump unit becomes a set flowrate LSET; and a discharge operation control unit configured to operate the plunger pump at the discharge rate v obtained by the discharge rate calculation unit.

Description

technical field [0001] The present invention relates to a liquid delivery device that stably transports a mobile phase by operating a plurality of plunger pumps in a complementary manner, and a high-speed liquid chromatograph (HPLC) or a supercritical fluid chromatograph (SFC) using the liquid delivery device and other fluid chromatographs. Background technique [0002] Liquid delivery devices for HPLC systems require the ability to deliver mobile phases stably at high pressures. Therefore, a dual-plunger type liquid feeding device in which two plunger pumps are connected in series or in parallel is generally used. [0003] For example, the primary side plunger pump on the upstream side of the liquid feeding device in which two plunger pumps are connected in series and the secondary side plunger pump on the downstream side complement each other. The liquid stroke and the liquid delivery stroke of the secondary plunger pump. [0004] During the discharge stroke of the prim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/32F04B1/26G01N30/34
CPCG01N30/32B01D15/40F04B23/06F04B49/08F04B49/20G01N30/34G01N2030/027G01N2030/326F04B49/065F04B2201/0202B01D15/163F04B11/0058
Inventor 柳林润今村信也小川佳祐日光政隆藤崎真一
Owner SHIMADZU SEISAKUSHO CO LTD
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