Air compressor safety management system is also widely used in the field of sensors. Acceleration sensor and pressure sensor are two schemes to control side airbag of air compressor.

Authoritative data show that compared with acceleration sensors, pressure sensors are nearly three times faster than acceleration sensors in detecting side impact speed, and the probability of misoperation is smaller. It is worth mentioning that the micro-sensor uses micro-machining technology to integrate micron-scale sensitive elements, signal conditioners and data processing devices into a chip. Because of its small size, low price and easy integration, the system testing accuracy can be improved. For example, by integrating the micro pressure sensor with the micro temperature sensor, and simultaneously measuring the pressure and temperature, the temperature effect in the pressure measurement can be eliminated through in-chip operation. At present, there are many micro sensors, such as pressure sensors. Intelligent sensors are equipped with dedicated computers, whose rapid development has raised the safety performance of air compressors to an unprecedented height. With the development of microelectronics and micromachining technology, sensors are developing towards 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 continue to increase. Air compressors are essential equipment for various factories, roads, mines and construction industries in the booming period of the sensor market in China. They are mainly used to provide sources of energy. Breaking compressed air with certain pressure, such as supplying air to pneumatic valves, provides gas source for process flow requiring 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, loading and unloading valves are used to control the air supply of air compressor. Because of the difference of working cycle or production process of air equipment, the air consumption fluctuates, sometimes it will cause frequent loading and unloading of air compressor. After unloading, the air compressor still operates at power frequency, which not only wastes electric energy but also increases the mechanical wear of the equipment. Moreover, loading is a sudden process, which will cause great impact on the equipment and power grid. Therefore, the frequency conversion transformation of air compressor has the effect of improving the start-up and operation of motor, reducing the mechanical wear of equipment and saving electric energy in a certain range.

The application of pressure sensor of vortex flowmeter in the control system of air compressor illustrates the working principle of air compressor with single screw air compressor as an example. The working process of screw air compressor is divided into four processes: suction, sealing and conveying, compression and exhaust. When the screw rotates in the shell, the teeth 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 teeth groove rotates, the inhaled oil and gas are sealed and transported to the exhaust port. During the transmission process, the meshing clearance of the teeth groove becomes smaller and the oil and gas are compressed; when the meshing surface of the teeth Gro At the exhaust port, the higher pressure of the oil-gas mixture is discharged from the body. The use of frequency converter can change the exhaust volume by changing the rotational speed of screw rotor. When the air volume changes, the frequency converter changes the rotational speed to adjust the exhaust volume of air compressor, so as to achieve the goal 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 closed, the loading cylinder does not move, the frequency converter drives the motor to run without load. After a period of time (which can be set arbitrarily by the controller, set here to 10S), the loading solenoid valve opens and the air compressor runs with load. When the air compressor starts to run, if the compressed air pressure in the storage tank and the back-end pipeline does not reach the upper limit of the pressure, the controller acts to load the valve, opens the intake port, and the motor loads, and continuously generates compressed air to the back-end pipeline. If the back-end gas equipment stops using gas, the compressed pressure in the back-end pipeline and storage tank gradually increases. When the upper limit of pressure is set, the pressure sensor sends out the unloading signal, the loading solenoid valve stops working, the intake filter closes, and the motor runs without load. When the air compressor is running continuously, the main body temperature of the compressor will rise. When the temperature reaches a certain level, the system is set to 80 C (which can be set by the controller according to the application environment) and the fan starts to run, which is used to reduce the working temperature of the main engine. When the fan runs for a period of time, the temperature of the main engine decreases and the fan stops running below 75 C. DPI701/702 pressure sensor is commonly used in air compressor in Baissde instrument family on the market at present. This kind of product is mainly used in air compressor, nitrogen machine, hydrogen and oxygen generator, hydraulic equipment, central air conditioning refrigeration unit, pipeline fluid, diesel generator, water treatment equipment, engineering machinery, liquidity liquid. Pressure measurement has the characteristics of high sensitivity, easy installation and good stability. Therefore, the product is widely used in high-demand industrial equipment.

DPI701 Pressure Transmitter