On the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter

Lip seals made of PTFE compound are used due to their high thermal and chemical stability for the sealing of shaft interfaces in housings. For a better dynamic leak-tightness hydrodynamic sealing aids are manufactured on the sealing lip. Thus a PTFE lip seal is capable of back-pumping fluid from the...

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Autores principales:	Nino Dakov, Simon Feldmeth, Mario Stoll, Frank Bauer
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2019
Materias:	shaft seal sealing aid ptfe lip seal i-ehl flow resistance pressure drag back-structured shaft seal pumping rate Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/f1956b49218e4713ab116844d5f4635f
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spelling	oai:doaj.org-article:f1956b49218e4713ab116844d5f4635f2021-11-05T09:17:25ZOn the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter1881-219810.2474/trol.14.359https://doaj.org/article/f1956b49218e4713ab116844d5f4635f2019-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/5/14_359/_pdf/-char/enhttps://doaj.org/toc/1881-2198Lip seals made of PTFE compound are used due to their high thermal and chemical stability for the sealing of shaft interfaces in housings. For a better dynamic leak-tightness hydrodynamic sealing aids are manufactured on the sealing lip. Thus a PTFE lip seal is capable of back-pumping fluid from the air to the fluid side. The pumping rate serves as an important parameter for the dynamic leaktightness of seals with a unidirectional sealing aid design. The correlation of pumping rate and dynamic leak-tightness for bi-directional sealing aid designs is deficient. A new hydrodynamic parameter is introduced to assess the dynamic leak-tightness of a sealing aid design. The so called pressure drag is the force resulting from the integral of the hydrodynamic pressure over the surface of the sealing aid. A hypothesis is proposed, stating that in order to guarantee a dynamically leak-tight shaft seal, two conditions should be satisfied. First, the pumping rate should be greater than zero. Second, the axial pressure drag should be directed entirely towards the fluid side. The hypothesis is verified on different types of unidirectional and bi-directional sealing aid design. In conclusion the axial pressure drag is shown to be a suitable performance parameter for the sealing aid design.Nino DakovSimon FeldmethMario StollFrank BauerJapanese Society of Tribologistsarticleshaft sealsealing aidptfe lip seali-ehlflow resistancepressure dragback-structured shaft sealpumping ratePhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 5, Pp 359-366 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	shaft seal sealing aid ptfe lip seal i-ehl flow resistance pressure drag back-structured shaft seal pumping rate Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	shaft seal sealing aid ptfe lip seal i-ehl flow resistance pressure drag back-structured shaft seal pumping rate Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Nino Dakov Simon Feldmeth Mario Stoll Frank Bauer On the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter
description	Lip seals made of PTFE compound are used due to their high thermal and chemical stability for the sealing of shaft interfaces in housings. For a better dynamic leak-tightness hydrodynamic sealing aids are manufactured on the sealing lip. Thus a PTFE lip seal is capable of back-pumping fluid from the air to the fluid side. The pumping rate serves as an important parameter for the dynamic leaktightness of seals with a unidirectional sealing aid design. The correlation of pumping rate and dynamic leak-tightness for bi-directional sealing aid designs is deficient. A new hydrodynamic parameter is introduced to assess the dynamic leak-tightness of a sealing aid design. The so called pressure drag is the force resulting from the integral of the hydrodynamic pressure over the surface of the sealing aid. A hypothesis is proposed, stating that in order to guarantee a dynamically leak-tight shaft seal, two conditions should be satisfied. First, the pumping rate should be greater than zero. Second, the axial pressure drag should be directed entirely towards the fluid side. The hypothesis is verified on different types of unidirectional and bi-directional sealing aid design. In conclusion the axial pressure drag is shown to be a suitable performance parameter for the sealing aid design.
format	article
author	Nino Dakov Simon Feldmeth Mario Stoll Frank Bauer
author_facet	Nino Dakov Simon Feldmeth Mario Stoll Frank Bauer
author_sort	Nino Dakov
title	On the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter
title_short	On the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter
title_full	On the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter
title_fullStr	On the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter
title_full_unstemmed	On the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter
title_sort	on the estimation of the dynamic leak-tightness of shaft seals with hydrodynamic sealing aids through a hydrodynamic parameter
publisher	Japanese Society of Tribologists
publishDate	2019
url	https://doaj.org/article/f1956b49218e4713ab116844d5f4635f
work_keys_str_mv	AT ninodakov ontheestimationofthedynamicleaktightnessofshaftsealswithhydrodynamicsealingaidsthroughahydrodynamicparameter AT simonfeldmeth ontheestimationofthedynamicleaktightnessofshaftsealswithhydrodynamicsealingaidsthroughahydrodynamicparameter AT mariostoll ontheestimationofthedynamicleaktightnessofshaftsealswithhydrodynamicsealingaidsthroughahydrodynamicparameter AT frankbauer ontheestimationofthedynamicleaktightnessofshaftsealswithhydrodynamicsealingaidsthroughahydrodynamicparameter
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On the Estimation of the Dynamic Leak-Tightness of Shaft Seals with Hydrodynamic Sealing Aids through a Hydrodynamic Parameter

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