Coordinate transformation of screw rotor profile in different cross sections

Gan, Shuyi; Qingzhou, Yu; Cao, Qing; Zhang, Jun; Li, Bin

doi:10.1016/j.vacuum.2021.110494

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Zhang et al 9 presented a profile generation method combining hypocycloid and epicycloid and proposed a novel dynamic balance method by mass removing for the fixed-pitch Quimby-tooth rotor. Gan et al 10 proposed a coordinate transformation model to solve the rotor profile at different cross-sections. The profile they used was also generated by combining multiple cycloids.…”

Section: Introductionmentioning

confidence: 99%

Study on the Quimby-tooth rotor profile for dry screw vacuum pumps

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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This paper summarizes three Quimby-tooth rotor profile (QRP) generation models for dry screw vacuum pumps. Seven typical profiles are generated and compared to reveal their differences in curve structure, meshing line, parameter design range, and geometrical characteristics. The analysis indicates that there still is insufficient design flexibility for the typical profiles in the application of conical rotors. Therefore, a novel rotor profile is further proposed, in this paper, by modifying an existing profile. The advantage of the novel profile is identified through a specific design case. Results show that the summarized profile generation models provide an effective means to generate typical profiles and create novel profiles. In comparison with traditional profiles, the proposed profile achieves a 2.8% reduction of the contact line length and a 1% boost of the internal compression degree for conical rotors. This paper presents effective references for profile design and optimization of dry screw vacuum pumps. Graphic Abstract [Formula: see text]

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Section: Introductionmentioning

confidence: 99%

Study on the Quimby-tooth rotor profile for dry screw vacuum pumps

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Geometric design and performance analysis of conical-rotor screw vacuum pump with adjustable flow field clearances

Zhang

Liu

Yong-ju

et al. 2023

Vacuum

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Modeling Investigation on Gas Backflow Performances in Screw Vacuum Pump

Zhang,

Liu,

Zhang

et al. 2024

Processes

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Rotor structure has a great influence on the gas backflow in a screw vacuum pump. The characteristics of the gas main flow along the spiral groove of the screw rotor and the gas reverse flow along the tooth-shaped, tooth side, radial, and circumferential clearances are investigated. A new mathematical model of the pumping flow and backflow involved in a flow balance model is proposed to investigate the actions of the shearing force and pressure difference force. The calculated backflow is verified by comparing the experimental measured results. The relationships of the structural parameters of the screw rotor are established. The effects of the rotor parameters, such as pitch, diameter, and compression ratio, on backflow are revealed. The results show that the rotor diameter and compression ratio remain constant and that the influence of pitch on the backflow is slightly weak, with backflow variations of less than 3%, whereas the pitch, rotor length, and compression ratio are constant and the rotor addendum diameter is directly proportional to the backflow. The addendum diameter of rotor #4 is the largest, and its backflow is about 1.5 times larger than that of rotor #1. When the rotor radial sizes and the pitch of the suction end are constant, the compression ratio is inversely proportional to the backflow in the low-pressure region and proportional to the backflow in the high-pressure regions. Therefore, for a vacuum pump operating in low-pressure areas, the use of the compression ratio of 2.2 or higher is favorable for the reduction in backflow.

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Coordinate transformation of screw rotor profile in different cross sections

Cited by 3 publications

References 24 publications

Study on the Quimby-tooth rotor profile for dry screw vacuum pumps

Study on the Quimby-tooth rotor profile for dry screw vacuum pumps

Geometric design and performance analysis of conical-rotor screw vacuum pump with adjustable flow field clearances

Modeling Investigation on Gas Backflow Performances in Screw Vacuum Pump

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