Leakage: there is a gap between the rotor, the rotor and the shell when it is working and running. It is not a direct contact, so gas leakage will occur. When the pressure increases, the gas will leak to the suction pipe and the suction grooved slot through the gap. Therefore, to minimize the amount of leakage, a sealing tooth is made on the top of the driven rotor, the root of the active rotor has a sealing groove, and the end of the rotor has a ring or strip seal. However, if the sealing line is worn, the leakage will also increase and the exhaust volume will decrease.
Two, suction state: screw compressor is a volume compressor, suction volume unchanged. When the suction temperature increases or the suction line resistance is too large and the suction pressure decreases, the density of the gas decreases, which reduces the gas displacement accordingly.
Three, cooling effect: when the gas is compressed, the temperature will rise, and the temperature of the rotor and the shell will also rise. During the suction process, the gas is expanded by the heating of the rotor and the shell, reducing the suction. Sometimes the rotor of the air compressor is cooled by oil, and the shell is cooled by water. The main reason is that the temperature drops. If the cooling capacity is poor, the temperature will increase and the exhaust volume will decrease.
Four, rotate speed: the displacement of the screw compressor is directly proportional to the speed. The speed will vary with the voltage and frequency of the grid. When the voltage is reduced (asynchronous motor) or the frequency is reduced, the speed will decrease and the volume of gas will be reduced.
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