A universal rotor design method for twin-rotor fluid machines with a parameterized sealing line considering inter-lobe clearances

Hoang, Minh Thuan; Wu, Yuh-Renn; Nguyen, Trong Linh

doi:10.1016/j.vacuum.2021.110276

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…a universal method [11] for the rotors development on the basis of the parametrized contact line is suggested. This approach makes it possible to develop both multi-lobe rotors of the Roots type and rotors of other non-contact pumps.…”

Section: Zusammenfassungmentioning

confidence: 99%

Roots multi‐lobe vacuum pumps with external compression

Raykov,

Salikeev,

Burmistrov

et al. 2024

Vak Forsch Prax

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SummaryThe influence of the number of lobes on the working process of Roots vacuum pump is examined using the production vacuum pump NVD‐200 with a rotor profile based on an elliptical curve as a prototype. Design with two‐lobe, three‐lobe and four‐lobe rotor profiles was considered. Calculation of the main parameters characterizing profile quality (area‐utilizing ratio and conductance of rotor mechanism clearances) was carried out. The influence of rotor “plumpness” on pumping characteristics was studied. It is shown that the number of lobes providing the maximal pumping speed is different depending on the geometric parameters of the rotor.

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Section: Zusammenfassungmentioning

confidence: 99%

Roots multi‐lobe vacuum pumps with external compression

Raykov,

Salikeev,

Burmistrov

et al. 2024

Vak Forsch Prax

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“…Therefore, the conical rotor is considered the most advanced internal compression structure. 16,21 However, the study on the rotor profile suitable for conical rotors is still in lack. To enhance the performance of conical rotors, the profile should be designed with different radiuses and tooth widths under different axial positions.…”

Section: Generation and Analysis Of Typical Qrpsmentioning

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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“…The geometric constraints for constructing the pre-defined sealing line are given by previous studies. 10,12,14 Therefore, this sub-section presents three geometric constraints of the pre-defined sealing line proposed in sub-section 2.1, including the continuity of the pre-defined sealing line, the distance between two axes of rotors, and the interference of rotor profile (pre-defined sealing line).…”

Section: Generation Of Rotor Profile Based On Pre-defined Sealing Linementioning

confidence: 99%

“…However, that study did not provide the general equation of sealing line for generating various claw-type rotor profiles of vacuum pumps. Recently, Hoang et al 14 proposed the parameterized sealing line to generate various rotor profiles of twin-rotor fluid machines. The parameterized sealing line, however, does not generate the claw-type rotor with an asymmetric profile on one side, such as the rotor profile shown in previous literature.…”

Section: Introductionmentioning

confidence: 99%

Methodology for generating a general profile of asymmetrical rotors of twin-screw vacuum pumps with point meshing feature by a pre-defined sealing line

Hoang

Tran

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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The sealing line is one of the key influences on twin-screw rotor vacuum pump performance. The design of a rotor profile based on a sealing line for an asymmetrical rotor of a vacuum pump can be studied further to generate varied rotor profiles and improve pump performance. Therefore, this study proposes a mathematical model for a pre-defined sealing line to design and optimize varied rotor profiles of vacuum pumps. The general sealing line, pre-defined by explicit equations of straight lines and elliptic curves, is proposed to generate various rotor profiles with different numbers of lobes. The functions for parameter variables of the pre-defined sealing line are constructed and directly variated along the rotor length to form the screw rotor with a variable pitch and a variable cross-section. The proposed pre-defined sealing line is also applied in the optimal design of a rotor profile to enhance pump performance. Numerical examples are performed to verify the flexibility and practicability of the proposed method.

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A universal rotor design method for twin-rotor fluid machines with a parameterized sealing line considering inter-lobe clearances

Cited by 10 publications

References 16 publications

Roots multi‐lobe vacuum pumps with external compression

Roots multi‐lobe vacuum pumps with external compression

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

Methodology for generating a general profile of asymmetrical rotors of twin-screw vacuum pumps with point meshing feature by a pre-defined sealing line

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