Reasons for the low actual displacement of screw air compressors
The customer did not change the pipeline on the grounds that it was “still usable”, and the multiple air leakage points found at this time became the main reason for the low actual displacement of the screw air compressor. So, what are the reasons for the low actual displacement of the screw air compressor? To sum up for you as follows:
- Leaks In addition to the above-mentioned leaks in the compressed air pipes, there are also rotor leaks. There is no contact between the rotors and between the rotors and the casing during operation, and the gap is maintained, so gas leakage will occur. When the gas with increased pressure leaks through the gap to the suction pipe and the suction groove, the exhaust volume will be reduced. In order to reduce the amount of leakage, sealing teeth are made on the tooth top of the driven rotor, sealing grooves are opened at the tooth root of the driving rotor, and ring-shaped or strip-shaped sealing teeth are also processed on the end face. If these seal lines are worn, the leakage will increase and the exhaust will decrease.
- Suction state The screw air compressor is a positive displacement compressor, and the suction volume remains unchanged. When the suction temperature rises, or the suction line resistance is too large to reduce the suction pressure, the density of the gas decreases, and the discharge volume of the gas will be reduced accordingly.
- Cooling effect The temperature of the gas will increase during the compression process, and the temperature of the rotor and the casing will also increase accordingly, so during the suction process, the gas will be heated by the rotor and the casing and expand, so the suction will be reduced accordingly. air volume. Some of the rotors of screw air compressors use oil cooling, and the casing is cooled with water, one of the purposes is to reduce its temperature. When the cooling effect is not good, the temperature will increase and the exhaust volume will decrease.
4.Speed The displacement of the screw air compressor is proportional to the speed, and the speed often changes with the voltage and frequency of the power grid. When the voltage is lowered or the frequency is lowered, the rotational speed will drop, reducing the air volume.
Sollant Group-Professional Compressed Gas Solutions Provider