Intelligent sensors are equipped with dedicated computers, whose rapid development has improved the safety performance of air compressors to an unprecedented height. With the development of micro-electronics and micro-mechanical processing technology, sensors are developing in the direction of miniaturization, multi-function and intellectualization. Industry experts are optimistic about the development prospects of air compressor sensors in China. They believe that the increase in the number of air compressors and the use of sensors on each air compressor will determine that the market capacity of sensors in China will increase from time to time, and the sensor market in China is entering a booming period.
Air compressor is a necessary equipment in various factories, roads, mines and construction industries. It is mainly used to provide compressed air with a certain pressure from time to time, such as air supply to pneumatic valves, and air supply to process flow that needs a certain pressure gas. There are many kinds of air compressors, such as screw air compressor, piston air compressor, centrifugal air compressor, scroll air compressor and so on. The market potential of screw air compressor is great, and it has been widely used in many industries. In the control of air compressor, the loading-unloading valve is used to control the air supply of air compressor. Because of the difference of working cycle or consuming technology of Air-using equipment, the air consumption is shaken. Sometimes, the air compressor is frequently loaded and unloaded. After unloading, the air compressor still operates at power frequency, which not only wastes electricity but also increases the mechanical wear of the equipment, and loading is a sudden process, which will have a great impact on the equipment and power grid. Therefore, the transformation of air compressor stop frequency conversion has the effect of improving motor start-up and operation, reducing mechanical wear of equipment and saving electric energy in a certain range. Vortex Flowmeter
Application of Pressure Sensor in Air Compressor Control System
Taking the single screw air compressor as an example, the working principle of the air compressor is expounded. The working process of the screw air compressor is divided into four processes: suction, sealing and delivery, contraction and exhaust. When the screw rotates in the shell, the tooth grooves of the screw and the shell mesh with each other, the air is inhaled by the intake port, and the oil is inhaled at the same time. Because the meshing surface of the tooth groove rotates, the inhaled oil and gas are sealed and delivered to the exhaust port. During the process of the delivery, the meshing clearance of the tooth groove decreases gradually and the oil and gas are compressed. When the meshing surface of the tooth groove rotates to the exhaust port of the shell, Exhaust the body.
The air compressor exhaust volume can be adjusted by changing the speed of screw rotor. When the air volume changes, the air compressor exhaust volume can be adjusted by changing the speed of frequency converter to achieve the purpose of constant exhaust pressure and energy saving.
In the control system of air compressor, the pressure sensor installed in the outlet pipe of the back end of air compressor is used to control the pressure of air compressor. When the air compressor starts, the loading solenoid valve is in the closed state, the loading cylinder does not move, and the frequency converter drives the motor to run without load. After a period of time (which can be set arbitrarily by the controller and set here to 10S), the loading solenoid valve opens and the air compressor runs with load. When the air compressor starts to operate, if the air consumption of the back-end equipment is large and the compressed pressure in the storage tank and the back-end pipeline does not reach the upper limit of pressure, the controller operates the loading valve, opens the intake port, and the motor operates under the load, and from time to time produces compressed air to the back-end pipeline. If the back-end gas equipment stops using gas, the compressed gas pressure in the back-end pipeline and storage tank increases slowly. When the upper limit of pressure is set, the pressure sensor sends out the unloading signal, loads the solenoid valve to stop working, the intake filter closes, and the motor runs without load.
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