Energy Saving Control Strategy of Switching Solenoid Valve

Solenoid valve is a common control component in industrial equipment. It is an automatic basic component used to control fluid and belongs to actuator, not limited to hydraulic and pneumatic. It is used in industrial control system to adjust the direction, flow, speed and other parameters of medium. The solenoid valve can cooperate with different circuits to achieve the desired control, and the control accuracy and flexibility can be guaranteed. There are many kinds of solenoid valves. Different solenoid valves play a role in different positions of the control system. The most commonly used are one-way valves, safety valves, direction control valves, speed control valves, etc.

This paper introduces the switching solenoid valve. As the name implies, the input electrical signals of the switching solenoid valve are rated voltage and zero voltage, and the output hydraulic/pneumatic signals are also in the maximum and minimum states. When the switching solenoid valve works, the coil always works at the maximum electrical signal or the minimum electrical signal. For the solenoid valve working at the maximum electrical signal for a long time, on the one hand, the control signal is always at the maximum. On the other hand, the heating of the solenoid valve during a long time operation will also significantly affect the service life of the solenoid valve. I checked the data of some manufacturers and sorted out two common energy-saving controls to share with you. On the one hand, it can reduce power consumption; on the other hand, it can significantly reduce coil heating and improve the service life of the solenoid valve.

The switch solenoid valve has experienced three stages from being energized to being fully opened, namely, starting, opening and keeping open. The reverse forces faced by the three stages are different, so we can understand that the electromagnetic forces required by the three stages are different, so the control signals required are different. As shown in the figure below, the output signal of the microcontroller is divided into three stages. In this case, the first two stages are strategic for 2s, and then the solenoid valve works in the third stage for a long time and maintains the control signal. At this time, the control signal is 40% of the start signal; Therefore, the consumption of control signal is reduced by 60%, the heating will be significantly reduced, and the service life will also be significantly improved. The disadvantage is that the control output pin of the microcontroller to the switching solenoid valve needs to be a proportional value, not a switching value.

It can be seen from the frame diagram and the consumption diagram of the input signal that we can understand the energy-saving plug as a microcontroller integrated in the plug. In this way, the input signal of the plug still uses the switch signal, and the actual output signal is similar to that described in "Method 1". This scheme will significantly reduce the consumption of the solenoid valve and improve the service life of the solenoid valve without changing the external control signal.

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