As one of the most widely used compressor types in the industrial field, screw air compressors are favored for their high efficiency, reliability, and low operating costs.
Overview of screw air compressors Screw air compressors are a type of positive displacement compressor that mainly relies on the rotation of a pair of intermeshing spiral rotors (male rotor and female rotor) to achieve gas compression.
Compared with other types of compressors, screw air compressors have the following significant advantages:
1: Since the exhaust temperature from the compressor is low (about 99°C), the lubricating oil in the air compressor unit or the user's air system will not carbonize.
2: The oil-injected screw air compressor has only two major moving parts. The structure is simple and there are few wearing parts.
3: The screw air compressor outputs pulse-free cold air, which extends the life of pneumatic tools.
4: Since the screw will not wear, the performance of the air compressor will not decrease.
5: The structure is compact, the unit size is small, and more air can be provided per square meter of land.
6: Since the transmitted air is pulse-free, the machine has low vibration during operation and does not require a special foundation. Therefore, the installation cost is low. Any relatively horizontal ground that can bear its weight can be installed.
7: The oil-injected screw air compressor can provide a continuously loaded air source, and can provide water-cooled and air-cooled models, with low investment.
8: The screw air compressor has better comprehensive operating economy than the reciprocating piston air compressor.
Working principle of screw air compressor：
Working process of screw air compressor: suction-compression-exhaust
1：Rotor rotation during suction process: The motor drives the male rotor to rotate, driving the female rotor (through synchronous gears or direct meshing) to rotate synchronously. The spiral tooth grooves continuously form new volume space during rotation.
Gas entry: Under the action of the pressure difference between the air inlet and the internal, the gas is sucked into the inter-tooth volume of the rotor. As the rotor continues to rotate, the inter-tooth volume increases to the maximum value, and the gas continues to fill.
2：Volume reduction and gas compression during compression: The rotor continues to rotate, and the gas enclosed in the inter-tooth volume is compressed due to the reduction in volume, causing its pressure and temperature to gradually increase.
Oil injection cooling (oil injection screw type): In this stage, lubricating oil is sprayed into the compression chamber (the amount of oil is controlled by the oil pressure regulating valve). The lubricating oil is mixed with the high-temperature and high-pressure gas to play a role in cooling, sealing, lubricating and noise reduction, effectively taking away the compression heat and reducing the gas temperature.
3： Gas discharge during exhaust process: When the inter-tooth volume rotates to the exhaust port, the internal gas pressure is higher than the exhaust pipe pressure, and the gas is discharged from the compressor until the gas in the volume is exhausted.
Lubricating oil separation (oil injection screw type): The discharged oil-gas mixture enters the oil-gas separator, and the lubricating oil is separated by centrifugal force, gravity and filtration. The separated lubricating oil is cooled and recycled; the compressed air enters the post-processing equipment (such as dryers, filters) for purification and is available to users.
KAPA has been focusing on screw air compressor solutions for 20 years.
Service hotline: +86-15986632735
Website: https://www.kapaac.com/
