4 Reasons for changes in the exhaust volume of screw compressors

What are the factors that affect the actual exhaust volume of screw compressors? Theoretically, the exhaust volume of screw compressors depends on the inter-tooth volume, the number of teeth and the rotation speed. The inter-tooth volume is determined by the geometric dimensions of the rotor. In practice, for screw compressors, there are four possible reasons why the actual exhaust volume is less than the theoretical exhaust volume:

1) Leakage.

The rotors and the rotors and the casing are not in contact during operation, and a gap is maintained, so gas leakage will occur. When the gas with increased pressure leaks through the gap to the suction pipe and the meshing groove being inhaled, the exhaust volume will be reduced. In order to reduce the leakage, sealing teeth are made on the top of the driven rotor, sealing grooves are opened on the root of the active rotor, and ring-shaped or strip-shaped sealing teeth are also processed on the end face. If these sealing lines are worn, the leakage will increase and the exhaust volume will decrease;

2) Inhalation state.

The screw 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 and the suction pressure is reduced, the density of the gas decreases, and the mass exhaust volume of the gas will be reduced accordingly;

3) Cooling effect.

The temperature of the gas will rise during the compression process, and the temperature of the rotor and the casing will also rise accordingly. Therefore, during the suction process, the gas will be heated by the rotor and the casing and expand, so the suction volume will be reduced accordingly. Some of the rotors of screw air compressors are cooled by oil, and the casing is cooled by water. One of the purposes is to reduce its temperature. When the cooling effect is not good, the temperature rises and the exhaust volume will decrease;

4) Speed.

The exhaust volume of the screw compressor is proportional to the speed. The speed often changes with the voltage and frequency of the power grid. When the voltage decreases (for asynchronous motors) or the frequency decreases, the speed will decrease, reducing the gas volume.

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There are roughly three levels of water removal in the exhaust of air compressors: