Cross pollution-free sample introduction device and control method thereof

Abstract

The invention discloses a cross pollution-free sample introduction device and a control method thereof. The sample introduction device comprises a syringe pump, a multiported valve, a cleaning fluid container, a reagent container and a waste liquid container. The syringe pump is provided with a first pipe port and a second pipe port and the first and second pipe ports are communicated with the cavity of the syringe pump. The first pipe port is connected to the cleaning fluid container through a first pipe with a control valve. The second pipe port is connected to a main connection port of the multiported valve through a second pipe. Branched interfaces of the multiported valve comprise an air inlet, a waste liquid outlet, a liquid outlet connected to the external container and several sample introduction ports. The sample introduction ports are connected to the reagent container. Through gas obstruction of a multiported valve core and a solution in a reagent pipe, in sample introduction, valve core grooves do not contact with residual reagents in the sample introduction ports so that cross pollution is prevented and test analysis accuracy is effectively improved. The cross pollution-free sample introduction device has a novel design, is convenient for operation, can be implemented easily and is convenient for promotion and use.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a cross-contamination-free sampling device and a control method thereof. Background technique [0002] The sample injector is a chemical instrument through which the sample to be tested can be placed into the analysis container, and it is widely used in many fields such as medical drug analysis, environmental protection monitoring, inspection and quarantine, etc. In the case of many types of samples or reagents to be analyzed, the injector is usually used in conjunction with a multi-way (reversing) valve, but when the multi-way valve switches the liquid inlet, the spool rotates to connect the main port and the branch inlet. The groove of the liquid port will have the opportunity to contact the reagent solution remaining in the non-target branch liquid inlet, which will easily cause cross-contamination when the reagents share the main interface, and affect the accuracy of the test...

AI Technical Summary

Problems solved by technology

In the case of many types of samples or reagents to be analyzed, the injector is usually used in conjunction with a multi-way (reversing) valve, but when the multi-way valve switches the liquid inlet, the spool rotates to connect the main port and the branch inlet. The groove of the liquid port will have the opportunity to contact the reagent solution remaining in the liquid inlet of the non-target branch, which will easily cause cross-contamination of the reagents in the process of sharing the main interface, which will affect the accuracy of the test analysis to a certain extent

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