GA series oil injection screw air compressor
The GA series meets multiple standards, lower operating costs, and longer service life.
Contains a new generation of innovative oil-injected screw rotors
Equipped with superior screw rotors and high-efficiency motors, the life-cycle cost of the compressor is reduced. Compared with GA fixed-frequency models, GA VSD has remarkable energy-saving effect.
GA on-site air systems are delivered ready to use. No need for a separate compressor room. Quiet operation, compact size and integrated air handling. Optional options are available to significantly reduce pressure drop and save energy.
The compact, integrated design of the GA 5-500 compressor incorporates internal piping, cooler, electric motor, lubrication and control systems all into an off-the-shelf package. The equipment has the characteristics of low failure frequency and short debugging time. Plug in and go
The GA FF all-in-one model has an integrated dryer and oil-water separator to protect your compressed air network. High-quality air extends equipment life, improves efficiency and ensures end product quality.
industry
Match your special requirements
GA oil-injected screw compressors deliver superior performance, flexible operation and high productivity at a low cost of ownership to reduce your energy bills. A wide range of compressors allows you to find the air solution that better suits your specific requirements. Ingersoll Rand GA compressors work in harsher environments to keep your production running efficiently.
Ingersoll Rand’s VSD⁺ technology enables air demand to be closely tracked by automatically adjusting motor speed to match compressed air supply to demand. Combining the GA VSD⁺ with the innovative iPM internal permanent magnet motor (IE4) technology, compared with GA’s fixed frequency models, the GA VSD⁺ model has a significant energy saving effect, which greatly reduces the total life cycle cost of the compressor. In addition to energy savings, the GA VSD⁺ offers increased displacement (FAD) over GA fixed speed models, resulting in increased efficiency and improved performance.
Advantages of oil-injected screw air compressor:
Oil-injected screw air compressors have become the new mainstream in the development of air compressors today, with excellent and reliable performance, low vibration, low noise, high efficiency, and no wearing parts. The precise cooperation between the male and female rotors and between the rotors and the shell of the body reduces the leakage of gas backflow and improves the efficiency; only the mutual meshing of the rotors, without the reciprocating motion of the cylinder, reduces the source of vibration and noise; the unique lubrication method brings many advantages:
With the pressure difference generated by itself, lubricating oil is continuously injected into the compression chamber and bearing, which simplifies the complicated mechanical structure.
The injected lubricating oil can form an oil film between the rotors, which has the effect of lubricating and cooling the equipment. The auxiliary rotor can be directly driven by the main rotor without using high-precision synchronous gears.
The sprayed lubricating oil can further increase the airtight effect to improve the volumetric efficiency of the air compressor.
Lubricating oil can reduce the noise generated by high frequency compression.
During the use of the air compressor, the oil supply is in the form of mist and is fully mixed with high-temperature compressed gas. The lubricating oil is repeatedly heated and cooled at a high circulation rate, and the water vapor and corrosive gases in the air are accelerated. Oxidative deterioration of oil. Therefore, the use of synthetic lubricating oil can not only absorb a large amount of compression heat, but also prevent the exhaust temperature from being too high, and there will be no friction between the rotor and the casing due to the difference in thermal expansion coefficient.
Of course, in some specific industries, the oil and gas in the compressed air will also cause problems in use. Even after the treatment of precision filters, it cannot achieve a completely oil-free state. Although the energy efficiency of oil-filled air compressors is higher, however, Equipping a precision filter in some application scenarios will result in additional purchase and replacement costs and a certain pressure loss.
Working principle of oil injection screw air compressor
Intake process
The screw air compressor has no intake and exhaust valve groups, and the intake is only regulated by the opening and closing of a regulating valve. When the tooth groove space of the main and auxiliary rotors is transferred to the opening of the air inlet wall of the casing, the space is very large. At this time, the tooth groove space under the rotor communicates with the free air of the air inlet, because the air in the tooth groove is exhausted after exhausting. It is completely discharged, and the tooth groove is in a vacuum state. When it is transferred to the air inlet, the outside air is sucked in, and flows into the tooth groove of the main and auxiliary rotors along the axial direction. When the air fills the entire tooth groove, the end surface of the intake side of the rotor is turned away from the air inlet of the casing, and the air between the tooth grooves is sealed. The above is the “intake process”.
Closing and conveying process
When the air intake is completed, the tooth peaks of the main and auxiliary rotors are sealed with the casing, and the air in the tooth grooves no longer flows out, which is the “closed process”. The two rotors continue to rotate, and the tooth peaks and tooth grooves match at the suction end, and the matching surface gradually moves to the exhaust end, which is the “transportation process”.
Compression and injection process
During 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 gradually decreases, the air in the tooth groove is gradually compressed, and the pressure gradually increases, which is the “compression process”. While compressing, lubricating oil is also sprayed into the compression chamber to mix with air due to the pressure difference.
exhaust process
When the end surface of the exhaust port of the rotor communicates with the casing (the pressure of the compressed air is very high at this time), the compressed air starts to be discharged until the meshing surface of the tooth crest and the tooth groove moves to the exhaust end surface of the casing. When the space between the meshing surface of the two rotors and the exhaust port of the casing is zero, the “exhaust process” is completed. At the same time, the tooth groove length between the meshing surface of the rotor and the air inlet of the casing reaches the longest again, thus, a new compression cycle begins.
