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Liquid delivery 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: 2022-06-21
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 delivery device and fluid chromatograph
  • Liquid delivery device and fluid chromatograph
  • Liquid delivery device and fluid chromatograph

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

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

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

[0045] In the analysis flow path 102 , the portion on the upstre...

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Abstract

The present invention provides a liquid sending device comprising: a discharge speed calculation unit configured to use the volume (V) of the mobile phase in the pump chamber of the sealed pump immediately before the start of the preload stroke, and the volume of the closed pump reduced by the preload stroke. The volume (ΔV) of the mobile phase in the pump chamber and the delivery pressure (P) are used to obtain the discharge velocity (v) of the plunger pump so that the flow rate (L PRE ) conversion value at atmospheric pressure (L ATM ) becomes the set flow rate (L SET ); a discharge operation control unit configured to operate the plunger pump based on the discharge speed (v) obtained by the discharge speed calculation unit.

Description

technical field [0001] The present invention relates to a liquid feeding device for stably transporting a mobile phase by operating a plurality of plunger pumps in a complementary manner, and a high-performance liquid chromatograph (HPLC) or a supercritical fluid chromatograph (SFC) using the liquid feeding device Isofluidic chromatograph. Background technique [0002] Liquid delivery devices used in HPLC systems require the ability to stably deliver mobile phases under high pressure. Therefore, a double-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 piston pump on the upstream side and the secondary side piston pump on the downstream side of a liquid feeding device in which two piston pumps are connected in series operate complementarily. The liquid stroke and the liquid delivery stroke of the secondary side plunger pump. [0004] In the discharge stroke of the...

Claims

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Application Information

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Patent Type & Authority Patents(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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