Rapid flow control valve set based on PWM and PCM technologies and control method

Abstract

The invention relates to a rapid flow control valve set based on PWM and PCM technologies. A plurality of parallel throttling pipelines are arranged in a main pipeline. Each throttling pipeline is provided with a proportional switching valve connected with a programmable logic controller. A control method of the rapid flow control valve set includes the following steps that the opening areas of the proportional switching valves of all the throttling pipelines are sequentially set to be doubled clockwise according to the throttling pipelines; the programmable logic controller converts the throttling set valve of the main pipeline into a binary code, numerical values of all bits of the binary code are converted into pulse signals after the throttling pipelines are sequentially optimized so that stop valves arranged on all the throttling pipelines can be controlled to be opened and closed. The parallel throttling pipelines are arrayed in an annular mode with the axis of the main pipeline as the center instead of being arrayed on the same plane in parallel, and the differences between pipe resistance of the inlets of the throttling pipelines are eliminated; the PWM valve proportional control technology is combined with the traditional PCM gas strength control technology, and the rapid and accurate flow regulation of large-flow gas is achieved.

Description

technical field [0001] The invention relates to a fast flow control valve group and a control method thereof, in particular to a fast flow control valve group based on PWM and PCM technology and a control method thereof. Background technique [0002] The commonly used gas flow regulating device in the pipeline is a pressure-stabilizing valve or a regulating valve. The former integrates an automatic control mechanism, which changes the valve outlet caliber according to the set threshold, and has a faster response speed, but the caliber is small, which is only suitable for small flow gas control; Wide, suitable for large flow gas control, but the valve response speed is slow, there are serious dead zone and hysteresis nonlinear, not suitable for fast control. It can be seen that when a single valve is used for gas flow control, there is mutual restriction between the caliber and the response speed, and it is difficult to achieve the purpose of fast control of large flow gas. ...

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies in PCM flow control technology: (1) The calibers of the throttle pipes are usually different, resulting in differences in the pipe resistance loss generated by the airflow in each pipe, so that the equivalent throttle area is not 2 times proportional; (2) ) In the throttling pipeline, there are essentially two throttling devices, the throttling plate hole and the switch valve, which makes it difficult to form a 2-fold equivalence relationship in the actual throttling pipeline area distribution; (3) the throttling plate hole area is fixed, The maximum throttling area of ​​the entire gas pipeline is also fixed, the entire device is only suitable for one working condition, and the reusability is poor

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