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

A gas system, program-controlled valve technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of unreasonable sealing surface structure, large dead volume, low stability, etc., and achieve excellent stability and reliability. The best sampling effect

Active Publication Date: 2020-09-11
SOUTHWEST RES & DESIGN INST OF CHEM IND
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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 se

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

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[0027] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0028] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0029] like Figure 1 ~ Figure 3 As shown, a program-controlled valve electrically driven with zero dead volume includes a valve body 1 , a transmission device and a driving motor 8 . The valve body 1 has a gas inlet and outlet 16 built in the valve body for gas inlet or outlet. The hardness of the metal material of the gas inlet and outlet 16 is less than that of the valve body, and the mating surface with the valve body reaches a certain degree of smoothness. Finally, the tapered sealing surface i...

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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...

Claims

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Application Information

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IPC IPC(8): G01N30/20
CPCG01N30/20G01N2030/201
Inventor 王少楠陈春玉谭依玲马昌宁唐霞梅方艾黎李威徐龙
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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