Design and evaluation of rotor clearances for oil-injected screw compressors

Buckney, David; Kovačević, Ahmed; Stošić, Nikola

doi:10.1177/0954408916660342

Cited by 7 publications

(8 citation statements)

References 3 publications

(5 reference statements)

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“…It is assumed that η is the angle between the line formed from the origin center of the female rotor to the pixel (x p1 ′ , y p1 ′ ), and the positive direction is the same with y-axis. When the pixel coordinates (x, y) at any point are substituted in equation (14) and after satisfying the following condition, the normal direction can be confirmed.…”

Section: 2mentioning

confidence: 99%

“…When the pixel coordinates (x p1 ′ , y p1 ′ ) from the actual profile of female rotor are substituted in equation (13), the corresponding normal line can be obtained. By the principle of normal direction judgment in equation (14), all pixels (x (m) ′ p2 , y (m) ′ p2 ) | m � 1, 2, . .…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…is method can be used to determine the initial contact position of the screw rotor pair and compute the clearance distribution diagram along the sealing line. A case study of an oil-injected compressor tested at elevated discharge temperatures with original and revised clearances was investigated by Buckney et al [14,15]. e nature of the contact between the load transferring surfaces in the screw mechanism was investigated by Jones and Velinsky [16] and Fu et al [17], which was necessary for the calculation of the contact positions and clearances between helical surfaces.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Engagement‐Pixel Tracking Method for Meshing Clearance Layout of Twin‐Screw Rotors

Cai

et al. 2019

Mathematical Problems in Engineering

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The performance of dry twin-screw compressors is primarily affected by the meshing clearance between a pair of meshing rotors. In this paper, a novel method for meshing clearance layout (MCL) is presented. The presented method is based on the engagement-pixel tracking (EPT) technique, which utilizes discrete-pixel curves generated by the two rotors. An algorithm for the proposed method is put forward. Firstly, when the profile of one rotor is known, the discrete point coordinates of the two rotor profiles and their thermal expansion profiles can be obtained. Secondly, the instantaneous contact models of the two rotors at special meshing positions are acquired under pixel coordinate system. Thirdly, through inspecting the pixels on the profile of a rotor and establishing the corresponding normal vector, the meshing clearance of the two rotors is extracted. Then, the meshing clearances can be generated by extracting the boundary pixels on the other rotor profile. Finally, the meshing clearance layout method is proposed. To verify the effectiveness of the presented method, a case study was conducted on a pair of meshing rotors to extract its meshing clearance. It was shown that the proposed method can be used as a tool for evaluating the clearance distribution of actual machined profiles.

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Section: 2mentioning

confidence: 99%

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Engagement‐Pixel Tracking Method for Meshing Clearance Layout of Twin‐Screw Rotors

Cai

et al. 2019

Mathematical Problems in Engineering

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“…8 Buckney researched on the local clearance deformation of screw machine at elevated discharge temperatures, creating the concept of "Rotor Boundary Map" with the help of non-dimensional chamber model. 9 A recommended assembling clearance was also given. Hsieh presented an experimental research on temperature distribution in the male and female rotors, on which basis the heat conduction in the rotors and the thermal deformation are discussed based on the calculated results.…”

Section: Introductionmentioning

confidence: 99%

A novel method for rotor profile optimization of high temperature screw expanders employed in waste heat recovery systems

et al. 2021

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High temperature expanders have always been employed in industrial waste heat recovery systems, where twin-screw expanders were frequently adopted.However, the significant thermal deformation of rotors contributes to much technical difficulty on the designation and manufacturing of high temperature twin-screw expanders. The profile should be optimized with consideration of its thermal deformation in high temperature working conditions. In this article, a novel method for twin-screw expander profile optimization is developed.The thermal deformation of rotors is considered with meshing pair rules and interlobe clearance presetting. Theoretical analysis on interlobe clearance is made any steam inlet temperature from 20 C to 400 C, while experimental facility was built to figure out its reliability at high temperature. The optimized profile proved the effectiveness of this method. The clearance decreases significantly, decreasing from 1.28 mm at the working temperature of 20 C to 0.16 mm at 400 C. The testing results illustrated that the significant thermal deformation of rotors causes much interlobe abrasion once the operating temperature reached 400 C. With clearance of 0.1 mm and the radius correction angle of 0.0758 , the screw expander was proved to be reliably working at 400 C.

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“…Buckney et al. 10 used single 2D rotor boundary map based on boundary conditional of non-dimensional chamber model to estimate local clearance distortions. Stošić 11 determined how assembly errors affect the inter-tooth clearance for twin-screw compressor rotors.…”

Section: Introductionmentioning

confidence: 99%

Inter-lobe clearance estimation for twin-screw rotor pairs with point-meshing features

Hoang

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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In practical production, it is impossible even to measure the inter-lobe (meshing) clearance of a screw rotor pair. However, understanding of the clearance distribution is essential since it is a major leakage path which greatly affects the twin-screw pump performance. Previous publications did not disclose explicit detail on how to calculate the meshing clearance for screw rotor pairs with point-meshing features. Therefore, this study proposes a meshing clearance calculation method for screw rotor pairs with point-meshing features. The complex meshing clearance can be simply determined by calculating the shortest distance between two normal-rack profiles generated using point-enveloping principle. Clearance distributions are much more intelligible to be exhibited on a 3-D contact line and the rotor profile. Due to its immeasurability in practice, the adaptability and the solution accuracy of the proposed numerical method are verified by applications on different rotor profiles and comparisons with measured results from a 3-D CAD model. The meshing clearance in a variable-pitch screw rotor pair and the clearance adjustability are also illustrated through the proposed examples.

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Design and evaluation of rotor clearances for oil-injected screw compressors

Cited by 7 publications

References 3 publications

A Novel Engagement‐Pixel Tracking Method for Meshing Clearance Layout of Twin‐Screw Rotors

A Novel Engagement‐Pixel Tracking Method for Meshing Clearance Layout of Twin‐Screw Rotors

A novel method for rotor profile optimization of high temperature screw expanders employed in waste heat recovery systems

Inter-lobe clearance estimation for twin-screw rotor pairs with point-meshing features

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