Working principle of screw air compressor

Working principle of screw air compressor The screw type air compressor is a machine used to increase gas pressure and transport gas, and belongs to a working machine that converts the power energy of the prime mover into gas pressure energy. There are many types of screw air compressors and a wide range of uses. At present, in addition to piston compressors, other types of screw air compressors, such as centrifugal, twin screw air compressors, rolling rotor and spiral lamps are effectively The development and utilization provide users with more possibilities in the selection of screw air compressor models. With the development of economy, my country's screw air compressor design and manufacturing technology has also made great progress, and the technical level of certain aspects of screw air compressors has also reached the international advanced level. At present, the domestic centrifugal screw air compressors cannot meet the domestic needs in terms of high technology and special product lights. In addition, there is still a gap between the screw air compressor and foreign countries in terms of technical level/quality/set of lights. With the ever-expanding requirements of China's petrochemical production scale, and with the development of new technologies, new gas seals, magnetic bearings and non-lubricated couplings, the development trend of turbo screw air compressors is mainly manifested in: continuous development of high pressure And small flow products; further study the ternary flow theory and apply it to the design of the impeller and vane diffuser lamp originals, in order to achieve high efficiency units; reduce noise, adopt noise protection to improve the operating environment. Generally, the air compressor station is composed of aborted screw air compressors, and each screw air compressor is driven by a motor and is independently controlled. In the actual work of the screw air compressor, the air compressor station is designed according to the maximum working load, so when the gas consumption is small, start one or two screw air compressor units, and when the gas consumption is large, start multiple parallel operations. The air compressor system presets the pressure value of the pipe network. The screw air compressor system will automatically load and unload according to the lower and upper limits of the preset pressure value to meet the gas consumption. The control method of the screw air compressor air compressor station brings many problems. The existing screw air compressor air compressor station control usually uses the following three methods to adjust the exhaust volume; the screw air compressor will protect the compressed air from air, which will cause A lot of energy is wasted, compressed air will be put into the atmosphere. Stopping the motor to adjust the pressure is only used in screw compressors with small capacity. Frequent start and stop of the motor consumes a lot of energy and shortens the service life of the screw compressor. Close the suction valve to adjust the pressure. Most screw air compressors close the suction valve to make the motor idle to adjust the pressure. However, the screw air compressor still drives the compressor during idling. At this time, the energy consumption accounts for about 30% of the full operation of the screw air compressor. —50%. The energy consumed when the motor starts is a large inertia load. The power required when the motor is started without load is roughly equivalent to 2-3 times the full-load operation. The screw air compressor frequently impacts the power grid during start-up control. Extend the service life of screw air compressor equipment. The pressure of the screw air compressor system converts the pressure of the pipe network into an electrical signal through the pressure transmitter and transmits it to the PID unit for comparison with the set value, and performs calculation according to the size of the difference according to the established control mode, so that the inverter of the screw air compressor outputs The corresponding speed is used to control the motor of the compressor, so that the actual pressure is equal to the setting to achieve the purpose of constant pressure, and the continuous adjustment of the air supply is realized to ensure the stability of the official website pressure. The above is provided by okmarts.com.