Every time the screw rotor of the oil-free screw vacuum pump stops pumping, it can be divided into the following stages: contraction suction, equal volume transportation, adiabatic contraction and equal pressure exhaust. In each stage, the physical parameters such as quality, volume, temperature, pressure and internal energy of the pumped gas will be changed. And the exhaust power consumption and exhaust temperature of oil-free screw vacuum pump with equal pitch change with the change of inlet pressure.
Inspiratory phase. The air storage volume at the front end of the two screw rotors is indirectly connected with the air inlet of the screw pump. In the process of the screw migration and transformation, and the suction slot moving backward, the air storage volume continuously shrinks and expands. The pumped gas outside the pump enters the air storage volume under the influence of the pressure difference. The cut off air storage volume and the gas sucked outside the pump inherit and move backward to stop the air inlet of the pump Gas delivery process to pump discharge port.
The austerity phase. The compression stage is the process of gas pressure rising from suction pressure to exhaust pressure. When the contraction phase stops, the total mass of the gas in the storage space increases greatly. The pressure is the exhaust pressure, and the temperature is the hybrid temperature of the two sectors. The total energy, enthalpy and entropy are also the sum of the two sectors.
Exhaust phase. When the air storage space is connected with the exhaust port, the exhaust process of the screw pump has started. The screw rotor does the most work on the gas, which is ultimately transformed into the kinetic energy, internal energy and heat release of the exhaust gas and disappears in the cooling system and exhaust situation space of the pump.
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