In the safety management system, the pressure sensor implements side airbag control. The air compressor safety management system is also a field in which sensors are widely used. The airbag side airbag is controlled by two methods: an acceleration sensor and a pressure sensor. Authoritative data shows that compared with accelerometers, pressure sensors are nearly three times faster in detecting side impacts than accelerometers, and the probability of malfunction is smaller.
It is worth mentioning that the miniaturized sensor uses micromachining technology to package micron-level sensitive components, signal conditioners, and data processing devices on a single chip. Due to its small size, low price, and easy integration, it can improve the system test accuracy. For example, by integrating the miniature pressure sensor and the miniature temperature sensor, and measuring the pressure and temperature, the pressure measurement can be eliminated by the on-chip operation. Temperature effect. At present, many miniature sensors have been available.
The smart sensor is equipped with a dedicated computer, and its rapid development has increased the safety of the air compressor to an unprecedented height. With the development of microelectronics technology and micromachining technology, sensors are developing towards miniaturization, multi-functionality and intelligence. 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 increase in the number of sensors used in each air compressor will determine the capacity of China's sensor market will continue to increase, and the Chinese sensor market is entering a period of booming.
Air compressors are essential equipment for a variety of plants, road construction, mining and construction industries. They are mainly used to provide a constant supply of compressed air with a certain pressure, such as supplying air to pneumatic valves, to provide a process that requires a certain pressure of gas. Gas source. There are many types of air compressors, such as screw air compressors, piston air compressors, centrifugal air compressors, scroll air compressors, etc., and screw air compressors have great market potential and many The industry is widely used. The air compressor adopts the loading and unloading valve to control the air supply of the air compressor in its control. Due to the working cycle of the gas equipment or the difference of the production process, the gas consumption fluctuates, which sometimes causes the air compressor to be frequently loaded and unloaded. . After the air compressor is unloaded, it still runs at the power frequency, which not only wastes electric energy but also increases the mechanical wear of the equipment, and the loading is a sudden process, which will cause a great impact on the equipment and the power grid. Therefore, the frequency conversion transformation of the air compressor has the effects of improving the starting and running of the motor, reducing the mechanical wear of the equipment, and saving electric energy within a certain range.
Application of Pressure Sensor in Air Compressor Control System
Taking the single-screw air compressor as an example to illustrate the working principle of the air compressor, the working process of the screw air compressor is divided into four processes: suction, sealing and conveying, compression and exhaust. When the screw rotates in the housing, the screw meshes with the groove of the housing, the air is sucked in by the air inlet, and the oil is also sucked in, and the sucked oil is sealed and transported to the exhaust port due to the rotation of the meshing surface; During the process, the meshing gap of the tooth groove gradually becomes smaller, and the oil and gas is compressed; when the meshing surface of the tooth groove rotates to the exhaust port of the casing, the higher pressure oil and gas mixed gas is discharged from the body.
The frequency converter can change the displacement of the screw by changing the speed of the screw rotor. When the volume of the gas changes, the inverter changes the speed of the air compressor to adjust the displacement of the air compressor to achieve constant discharge pressure and save energy. the goal of.
In the air compressor control system, the pressure sensor installed on the air outlet pipe at the rear end of the air compressor is used to control the pressure of the air compressor. When the air compressor starts, the loading solenoid valve is in the closed state, the loading cylinder does not move, and the inverter drives the motor to run at no load for a period of time (the controller can be arbitrarily set, here set to 10S), the loading solenoid valve is opened. The air compressor is running on load. When the air compressor starts running, if the back-end equipment uses a large amount of gas, and the pressure of the compressed gas in the gas storage tank and the rear-end pipeline does not reach the upper pressure limit, the controller acts to load the valve, open the intake port, and the motor load Run, continuously producing compressed air to the rear line. If the gas is stopped by the gas equipment at the back end, the pressure of the compressed gas in the rear end pipeline and the gas storage tank gradually increases. When the pressure upper limit value is reached, the pressure sensor sends an unloading signal, and the loading solenoid valve stops working, the air inlet The filter is turned off and the motor is running at no load.
When the air compressor is running continuously, the temperature of the compressor main body will rise. When the temperature reaches a certain level, the system is set to 80 °C (the controller can be set according to the application environment). The fan starts running and is used to reduce the working temperature of the main engine. . The fan runs for a period of time, the temperature of the main engine drops, and the fan stops below 75 °C.
At present, the pressure sensors on the air compressors commonly used in the market are pressure transmitters made of SSI chips of American SMI products and pressure sensors made by éœå°¼å¾®å°” MLH016BSB01B of the United States! These products are mainly used in air compressors, water treatment equipment, industrial equipment, buildings, HVAC, petroleum, automotive, etc., OEM factories.
PTY503 pressure transmitter characteristic parameters:
Pressure range 0 ~ 0.6MPa ~ 1MPa ~ 80MPa overload 3X.
Rated pressure electrical performance power supply 9 ~ 36DCV
Input impedance 500010%
Output impedance 50008%
Environmental conditions electrostatic damage (ESD)>10kv
Working temperature -20 ~ 150 ° C
Physical characteristics weight 0.10g
Compatible with clean, dry, non-corrosive gas specifications for media,
Zero output 10mV full output 6020mV linearity 0.20%
FS hysteresis and repeatability 0.10% FSO
Zero temperature coefficient 0.04% FSO/°C
Temperature coefficient of resistance 0.30% / °C
Sensitivity temperature coefficient -0.20VV%FSO/°C
Zero thermal hysteresis 0.10% FSO
Long-term stability 0.20% FSO
Note: 1. This series only provides absolute pressure type. The product adopts MEMS production process and high-performance test method to ensure the stability of its work to the greatest extent. It has ensured its superior performance, featuring high sensitivity, good dynamic response, high precision, easy miniaturization and integration. This product is therefore widely used in demanding industrial equipment!
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