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Binary pump and liquid chromatograph equipped with the same

A binary pump and pump technology, applied in the field of liquid chromatograph, can solve the problems of inability to obtain a mobile phase, delay in liquid delivery, etc., and achieve the effects of achieving liquid delivery accuracy and improving reproducibility

Active Publication Date: 2022-07-22
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such a backflow occurs, there is a problem that the liquid delivery delay occurs when the stopped pump unit is operated to start the liquid delivery, and the mobile phase with the desired mixing ratio cannot be obtained.

Method used

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  • Binary pump and liquid chromatograph equipped with the same
  • Binary pump and liquid chromatograph equipped with the same
  • Binary pump and liquid chromatograph equipped with the same

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Experimental program
Comparison scheme
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Embodiment Construction

[0042] Hereinafter, one embodiment of the switching valve, the binary pump, and the liquid chromatograph of the present invention will be described with reference to the accompanying drawings.

[0043] use figure 1 The flow path configuration of the liquid chromatograph according to an embodiment will be described.

[0044] The liquid chromatograph of this embodiment includes an analysis flow path 2 , a binary pump 4 , a mixer 14 , a sample injection unit 16 , an analysis column 18 , and a detector 20 . The binary pump 4 sends liquid A and liquid B as solvents to the mixer 14 , and the mixer 14 mixes the liquid A and liquid B sent by the binary pump 4 . The sample injection unit 16 is provided on the downstream side of the mixer 14 in the analysis flow path 2 , and injects the sample into the analysis flow path 2 . The analysis column 18 is provided on the further downstream side of the sample injection part 16 in the analysis flow path 2 , and separates the sample injected ...

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PUM

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Abstract

The binary pump of the present invention includes a switching valve that can switch between a state in which only one of the first pump part and the second pump part is connected to the output part (a first state, a second state), and a state in which only one of the first pump part and the second pump part is connected to the output part. 2 The state in which both pump parts are connected to the output part (third state), has the function of preventing backflow of the liquid by switching the state of the switching valve, especially preventing the use of both the first pump part and the second pump part. The function of liquid backflow during liquid.

Description

technical field [0001] The present invention relates to a binary pump provided with a switching valve, and a liquid chromatograph provided with such a binary pump as a liquid feeding device for feeding a mobile phase liquid. Background technique [0002] In liquid chromatography or supercritical fluid chromatography, there is a case where gradient analysis is performed in which the composition of the mobile phase is changed over time while the analysis is performed. In gradient analysis, the composition of the mobile phase is changed over time by feeding the two solvents while changing the flow rates of the two solutions. As a liquid feeding device for such gradient analysis, a binary pump is known. The binary pump is provided with two pump parts, and the liquids sent from the respective pump parts are combined and outputted (refer to Patent Document 1). [0003] prior art literature [0004] Patent Literature [0005] Patent Document 1: US Patent No. 7670480 SUMMARY O...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/32G01F1/00G01F1/34G01N30/26G01N30/86
CPCG01F1/00G01F1/34F04B49/22F04B49/08F04B23/02F04B23/06F04B11/005F04B1/02G01N30/34G01N2030/347F04B23/04F04B2205/05G01N30/32G01N30/8658G01N2030/326G01N2030/328
Inventor 藤崎真一
Owner SHIMADZU SEISAKUSHO CO LTD