Multi-channel mixed gas formulating system

Abstract

The present invention is a multi-way mixed gas preparation system. The system is formed in the way that an input end of an upper computer is connected with a multi-way and large-flow measuring controller group and multi-way and small-flow measuring controller group respectively to control a gas flow; gas output ends of the multi-way and large-flow measuring controller group and the multi-way and small-flow measuring controller group are connected with a gas mixing chamber to mix gases; an input end of a gas analyzer is connected with an output end of the gas mixing chamber; an output end of the gas analyzer is connected with an input end of the upper computer to acquire a concentration signal. The present invention can both control a total flow of the mixed gas and reach the target component concentration requirement. Moreover, the present invention can realized the mixed preparation of multi-way and large-flow gases under a high-resolution closed-loop control condition. During a preparation course, the gas source is stable, the repeatability is good, the system automation is high, the operation is simple and convenient and the gas preparation precision is quite high.

Description

technical field [0001] The invention relates to a mixed gas preparation system. In particular, it relates to a kind of mixed gas preparation under the condition of high-resolution closed-loop control of multi-channel and large-flow gas, and the gas distribution gas source is stable, the repeatability is good, the system has a high degree of automation, simple and convenient operation, and has high gas distribution. Precision multi-channel mixed gas preparation system. Background technique [0002] In production, testing, etc., it is often necessary to configure a mixed gas with a specific flow rate and component concentration. For example, in the activity evaluation test process of a motor vehicle exhaust catalytic converter, it is necessary to configure a certain flow rate and require a mixed gas with a specific component concentration to simulate Engine exhaust. The traditional gas distribution method is: each gas flows through a flow controller, and then mixed in parall...

AI Technical Summary

Problems solved by technology

The weakness of this method lies in the low control accuracy in large flow and multi-gas mixing applications

Because the absolute value of the error of the conventional flow controller increases with the increase of the range, the absolute value of the resolution of the flow control also increases, and it is impossible to achieve high-precision control under the condition of large flow; Feedback correction, the component concentration is only guaranteed by the accuracy of the flow controllers of each gas path, so with the increase of the gas types in the mixed gas, that is, the increase in the number of gas paths, the errors normally existing in the flow controllers of each gas path will be accumulated, thus Directly affect the control accuracy of the final mixture component concentration

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