Control method for adjusting accurate opening proportion of proportional valve and fluid proportional valve thereof

Abstract

The invention discloses a control method for adjusting an accurate opening proportion of a proportional valve and a fluid proportional valve thereof. A fluid circulating channel is arranged in a fluidcirculating part, a flow control hole is formed in the fluid circulating channel, and an electronic ranging device is fixed right below the flow control hole; an electric control driving device is fixed right above the flow control hole, the bottom end of a telescopic shaft is connected to a flow control plug, and a fluid control gap is formed between the orifice of the flow control hole and theflow control plug; the electric control driving device and the electronic ranging device are connected to a controller through wires; by setting the lowest point of a plug body of the flow control plug as a ranging position on the controller and the distance from the electronic ranging device to the lowest point of the plug body as a detected distance, the telescopic shaft is controlled by the controller to lift to control the electronic ranging device to detect the distance between the lowest point of the plug body of the flow control plug and the electronic ranging device, and an opening proportion of a fluid control gap is obtained by measuring the distance value therebetween.

Description

Technical field [0001] The invention relates to a flow control valve, in particular to a control method for adjusting the precise opening ratio of a proportional valve and a fluid proportional valve. Background technique [0002] The proportional valve is powered by the controller and the controller gives the signal to perform its work. However, the adjustment ratio is driven by the analog current signal of the proportional valve, and the analog current signal is coordinated by the magnetic induction coil and the magnet, and the magnetic induction coil will be affected by the current, The influence of voltage, temperature and humidity of the application environment; for example: set the opening ratio in the controller. If the current is too low or too high, the opening ratio will be inaccurate (low current will lead to a small magnetic induction value of the analog current signal, then The magnetic induction value of the current signal is small, resulting in a small opening ratio...

AI Technical Summary

Problems solved by technology

[0002] The proportional valve is powered by the controller and the signal is given by the controller to perform work. However, the adjustment ratio is driven by the analog current signal of the proportional valve, and the analog current signal works with the magnetic induction coil and the magnet, and the magnetic induction coil will be affected by the current, The influence of voltage, temperature and humidity of the application environment; for example: if the opening ratio is set in the controller, if the current is too low or too high, the opening ratio will be inaccurate (low current will cause the magnetic inductance value of the analog current signal to be small, then The magnetic inductance value of the current signal is small, resulting in a small opening ratio; on the contrary, the high current will lead to a large magnetic inductance value of the current signal, and the magnetic inductance value of the current signal is too large, resulting in a large opening ratio), because the opening gap of the control flow is small, This leads to inaccurate flow, perhaps loud noise during long-term cruise conversion, poor self-adaptive adjustment, and system closed-loop failure, which affects subsequent machine operation

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