-GA series oil injection screw air compressor
-GA series oil injection screw air compressor
► product model
GA and GA + (5-500 kW)
GA VSD (37 -315 kW)
GA Vsd-Plus (7-160 kW)
ø Advantages of oil injection screw air compressor:
Oil injection screw air compressor has become the new mainstream of the development of today's air compressor. It has excellent and reliable performance. Its operation has small vibration, low noise, high efficiency and no wearing parts. The precise fit between Yin and Yang rotors and between rotors and the body shell reduces the gas backflow leakage and improves the efficiency. Only the mutual meshing of the rotor, no reciprocating movement of the cylinder, reducing the source of vibration and noise; The unique lubrication method brings many advantages:
By means of the pressure difference generated by itself, lubricating oil is continuously injected into the compression chamber and bearings, simplifying the complex mechanical structure.
The lubricating oil injected can form an oil film between the rotors, which has the function of lubricating and cooling the equipment. The auxiliary rotor can be directly driven by the main rotor, without the help of high precision synchronous gear.
The lubricating oil injected can increase the role of air tightness and be used to improve the volumetric efficiency of the air compressor.
Lubricating oil can reduce the noise caused by high frequency compression.
In the use of air compressor, the oil supply is foggy and fully mixed with high temperature compressed gas. The lubricating oil is heated and cooled repeatedly at a high circulation speed. At the same time, the water and corrosive gases in the air accelerate the oxidation and deterioration of oil products. Therefore, the use of synthetic lubricating oil, not only can absorb a lot of compression heat, and the exhaust temperature is not too high, the rotor and the housing will not produce friction due to the different coefficient of thermal expansion.
Of course, in some specific industries, the oil and gas in compressed air will also cause problems in the use of oil. Even after the treatment of precision filters, it can not reach the level of completely oil-free. Although the energy efficiency of oil air compressors is higher, however, in some application scenarios, the installation of precision filters will generate additional acquisition, replacement costs and certain pressure losses.
► Working principle of oil injection screw air compressor
The screw air compressor has no intake and exhaust valve group, and the intake only depends on the opening and closing of a regulating valve. When the groove space of the main and secondary rotors is transferred to the opening of the housing inlet wall, the space is very large. At this time, the space of the groove below the rotor is communicated with the free air of the air inlet, because the air in the groove is completely discharged when the exhaust is finished, and the groove is in a vacuum state. When the air is transferred to the air inlet, the outside air is inhaled and flows along the axial direction into the groove of the main and secondary rotors. When the air is filled with the whole tooth groove, the air inlet side face of the rotor is turned away from the air inlet of the housing, and the air between the tooth groove is closed. The above is the "air intake process".
Sealing and conveying process
When the air intake is completed, the main and secondary rotor teeth are sealed with the housing, and the air in the tooth groove is no longer flowing out, which is the "sealing process". The two rotors continue to rotate, and the tooth peak and tooth groove anastomosis at the inspiratory end, and the anastomotic surface gradually moves to the exhaust end, which is the "conveying process".
Compression and injection process
In the conveying process, the meshing surface gradually moves to the exhaust end, so that the tooth groove space between the meshing surface and the exhaust port is gradually reduced, the air in the tooth groove is gradually compressed, and the pressure is gradually increased, which is the "compression process". At the same time of compression, lubricating oil is also injected into the compression chamber and mixed with air due to the effect of pressure difference.
When the end face of the exhaust port of the rotor is communicated with the housing (the pressure of compressed air is high at this time), the compressed air begins to discharge until the meshing surface of the tooth peak and tooth groove moves to the end face of the exhaust end of the housing. At this time, the space of tooth groove between the meshing surface of the two rotors and the exhaust port of the housing is zero, that is, the "exhaust process" is completed. At the same time, the tooth groove length between the meshing surface of the rotor and the inlet of the housing reaches the longest, and thus a new compression cycle begins.
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