The research article 'Analysis and numerical simulation of claw vacuum pumps with novel three-claw rotors' has been published in the journal Energy.

Abstract

The vacuum pumps play an important role in the vacuum system, and the rotor profiles of the vacuum pumps determine its working performance. The composition curves of the existing three-claw rotor profiles are complicated, and the compressed gas remaining in the carryover is recompressed, resulting in a remarkable increase of power consumption. For solving those problems, a sinusoidal curve was proposed to smoothly connect the addendum and dedendum arcs, and a novel three-claw claw rotor and its parametric equation were obtained. A novel discharge port was designed to avoid the secondary-compression of the gas in the carryover. The working process and the internal flow field of the new three-claw vacuum pump (TCVP) were revealed through numerical simulation. The mass flow rate at the proposed discharge port was also analyzed. Study results show that the proposed claw rotor has considerable advantages of simple profile, high internal volume ratio and small relative carryover. The designed discharge port realizes complete gas discharge without secondary-compression of the gas in the carryover. It reveals the phenomenon that part of the gas in the chamber formed by the separation of the compression chamber can flow back to the suction chamber in the compression process.

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