Program control valve electrically driven by zero dead volume and sample injection gas path system

Abstract

The invention discloses a program control valve electrically driven by zero dead volume. The program control valve mainly comprises a valve body, a transmission device and a driving motor, wherein thevalve body is provided with a gas inlet / outlet arranged in the valve body; the hardness of the metal material of the gas inlet / outlet is smaller than the hardness of the material of the valve body, and after the matching surface between the gas inlet / outlet and the valve body reaches a certain degree of finish, a conical sealing surface is formed between the gas inlet / outlet and the valve body ina press fit mode. The invention also provides a sample injection gas path system. Sample injection is realized through match between the program control valve and the gas path. The valve body is connected with the gas circuit through a zero dead volume sealing joint, the gas circuit is designed to have a small drift diameter ranging from 0.5 mm to 1 mm, and the tolerance of the outer diameter ofa pipeline used for gas circuit connection is within + / -0.002 mm. The external power supply drives the motor to rotate, and the driving motor drives the transmission device to drive the valve elementof the valve body to rotate so as to achieve the purpose of valve switching. According to the program control valve and the sample injection gas path system, the dead volume can be controlled to be 0.15 muL or below.

Description

technical field [0001] The invention belongs to the technical field of valves, in particular to a zero-dead-volume electric-driven program-controlled valve and a sampling gas path system. Background technique [0002] The large dead volume causes the gas path to replace the dead angle, which makes the analysis equipment unable to obtain representative samples, and finally distorts the analysis results. In the analysis, the dead volume of the world-class zero dead volume programmable valve is controlled below 0.15μL. [0003] At present, there is no zero-dead-volume electric-driven program-controlled valve suitable for high-end online chromatographs. The main technical problems are as follows: 1) The dead volume is relatively large, usually greater than 100 μL; 2) The sealing surface structure is unreasonable, almost flat or round The cylinder-type sealing method will cause leakage after long-term operation; 3) The number of continuous operation of the valve is about tens of...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no zero-dead-volume electric-driven program-controlled valve suitable for high-end online chromatographs. The main technical problems are as follows: 1) The dead volume is relatively large, usually greater than 100 μL; 2) The sealing surface structure is unreasonable, almost flat or round The cylindrical sealing method will cause leakage after long-term operation; 3) The number of continuous operation of the valve is about tens of thousands of times, and the stability is not high

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