Gas chromatograph and its multi-channel carrier gas path and gas path control method

Abstract

The invention discloses a gas chromatograph, a multi-channel carrier gas flow path, and a gas path control method; the multi-channel carrier gas flow path comprises a pressure-stabilizing valve, a multi-channel, a flow-stabilizing device and a ventilation pipeline, and the multi-channel is opened with a plurality of The air port, the pressure-stabilizing valve and the steady-flow device are respectively communicated with the plurality of air ports through the ventilation pipeline. Compared with the prior art, firstly, due to the use of multiple channels, the arrangement of the ventilation pipelines in the multi-channel carrier gas flow path is reduced, so that the structure is more compact and simple, and the occupied space is reduced, which is not only conducive to the centralized management of the multi-channel carrier gas control. , realize the modular management of flow path control, and also facilitate the miniaturization of the gas chromatograph; in addition, the integrated installation of the pressure-stabilizing valve and the flow-stabilizing device can realize the constant pressure and constant flow control of the carrier gas at the same time, and make the gas flow control more convenient. Accurate and convenient; in addition, the air flow is controlled by the pressure stabilizer valve and the stabilizer valve, which replaces the expensive electromagnetic proportional valve and sensor, and the failure points are also reduced, which greatly saves the manufacturing cost and maintenance cost.

Description

technical field [0001] The present invention relates to the field of gas chromatographic analysis, in particular to a gas chromatograph and its multiple carrier gas paths, and also relates to a gas path control method using the multiple carrier gas paths to control gas flow. Background technique [0002] Inside the gas chromatograph, depending on the detector, the required gas flow path control is also different. For existing gas chromatographs, generally one gas chromatograph requires multiple carrier gas paths for control. Now some foreign gas chromatographs, the multi-channel carrier gas flow is controlled by electromagnetic proportional valve, flow sensor and integrated electric board, the control is more accurate, but the structure is more complicated and the cost is high; in addition, the failure point of the multi-channel carrier gas flow More, the maintenance cost is higher, is unfavorable for promotion and application. However, in some domestic gas chromatographs,...

AI Technical Summary

Problems solved by technology

Now some foreign gas chromatographs, the multi-channel carrier gas flow is controlled by electromagnetic proportional valve, flow sensor and integrated electric board, the control is more accurate, but the structure is more complicated and the cost is high; in addition, the failure point of the multi-channel carrier gas flow Many, high maintenance cost, not conducive to popularization and application

However, in some domestic gas chromatographs, the control of the multi-channel carrier gas flow path is relatively simple, but the structure is not compact enough, it takes up a large space, and the accuracy is not high, which affects the analysis results of the gas chromatograph, and the reliability is low, which is not conducive to gas chromatography Miniaturization design of chromatograph

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