Effects of stable clearances on backflow in the variable-pitch screw vacuum pump

Effects of various clearances of variable-pitch screw vacuum pump on gas backflow of internal flow field of the pump cavity is studied. The theoretical tooth surfaces of screw rotor are optimized by radial, normal equidistance modifications, and four types of stable clearances of rotor circumferenti...

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Autores principales:	Zhang Li, Zhang Yongju, Chen Ziyun
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	variable-pitch screw vacuum pump stable clearances backflow interstage numerical simulation Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/8bdc25f79c97487082435d441464bb6e
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spelling	oai:doaj.org-article:8bdc25f79c97487082435d441464bb6e2021-11-12T11:45:15ZEffects of stable clearances on backflow in the variable-pitch screw vacuum pump2257-77772257-775010.1051/meca/2021046https://doaj.org/article/8bdc25f79c97487082435d441464bb6e2021-01-01T00:00:00Zhttps://www.mechanics-industry.org/articles/meca/full_html/2021/01/mi210050/mi210050.htmlhttps://doaj.org/toc/2257-7777https://doaj.org/toc/2257-7750Effects of various clearances of variable-pitch screw vacuum pump on gas backflow of internal flow field of the pump cavity is studied. The theoretical tooth surfaces of screw rotor are optimized by radial, normal equidistance modifications, and four types of stable clearances of rotor circumferential, radial, tooth shape and tooth sides are obtained. The backflow calculation model in clearances considering Couette backflow and orifice backflow is improved. The three-dimensional model of variable-pitch screw vacuum pump is designed, and the experimental prototype and test device are developed. The internal backflow of vacuum pump is analyzed by using the commercial software Ansys-Fluent® and the calculation model. The results show that the smaller the clearances, the smaller the backflow and the higher the vacuum degree. Among the four types of clearances, the circumferential clearance plays the primary roles. The backflow is directly proportional to the inlet pressure and rotating speed. Predictions are validated by the experimental data with satisfied agreement.Zhang LiZhang YongjuChen ZiyunEDP Sciencesarticlevariable-pitchscrew vacuum pumpstable clearancesbackflowinterstagenumerical simulationMaterials of engineering and construction. Mechanics of materialsTA401-492ENMechanics & Industry, Vol 22, p 46 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	variable-pitch screw vacuum pump stable clearances backflow interstage numerical simulation Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	variable-pitch screw vacuum pump stable clearances backflow interstage numerical simulation Materials of engineering and construction. Mechanics of materials TA401-492 Zhang Li Zhang Yongju Chen Ziyun Effects of stable clearances on backflow in the variable-pitch screw vacuum pump
description	Effects of various clearances of variable-pitch screw vacuum pump on gas backflow of internal flow field of the pump cavity is studied. The theoretical tooth surfaces of screw rotor are optimized by radial, normal equidistance modifications, and four types of stable clearances of rotor circumferential, radial, tooth shape and tooth sides are obtained. The backflow calculation model in clearances considering Couette backflow and orifice backflow is improved. The three-dimensional model of variable-pitch screw vacuum pump is designed, and the experimental prototype and test device are developed. The internal backflow of vacuum pump is analyzed by using the commercial software Ansys-Fluent® and the calculation model. The results show that the smaller the clearances, the smaller the backflow and the higher the vacuum degree. Among the four types of clearances, the circumferential clearance plays the primary roles. The backflow is directly proportional to the inlet pressure and rotating speed. Predictions are validated by the experimental data with satisfied agreement.
format	article
author	Zhang Li Zhang Yongju Chen Ziyun
author_facet	Zhang Li Zhang Yongju Chen Ziyun
author_sort	Zhang Li
title	Effects of stable clearances on backflow in the variable-pitch screw vacuum pump
title_short	Effects of stable clearances on backflow in the variable-pitch screw vacuum pump
title_full	Effects of stable clearances on backflow in the variable-pitch screw vacuum pump
title_fullStr	Effects of stable clearances on backflow in the variable-pitch screw vacuum pump
title_full_unstemmed	Effects of stable clearances on backflow in the variable-pitch screw vacuum pump
title_sort	effects of stable clearances on backflow in the variable-pitch screw vacuum pump
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/8bdc25f79c97487082435d441464bb6e
work_keys_str_mv	AT zhangli effectsofstableclearancesonbackflowinthevariablepitchscrewvacuumpump AT zhangyongju effectsofstableclearancesonbackflowinthevariablepitchscrewvacuumpump AT chenziyun effectsofstableclearancesonbackflowinthevariablepitchscrewvacuumpump
_version_	1718430563706077184

Effects of stable clearances on backflow in the variable-pitch screw vacuum pump

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