Static Seals

Flitney, Robert

doi:10.1016/b978-0-08-099416-1.00002-4

Cited by 10 publications

(12 citation statements)

References 8 publications

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“…Lip seals are widely used to seal rotating shafts such as hydraulic turbine shafts, stern shafts of large ships, engine crankshafts of formula cars, output shafts of gearboxes, and shafts of air compressors. [1][2][3] As shown in Figure 1, The lip seal used in this study is a PTFE seal, with a sealing lip material made of a highly wear-resistant PTFE compound. Additionally, it is a double-lip shape, which has better pressure resistance and sealing performance than a single lip by adding an additional sealing lip.…”

Section: Introductionmentioning

confidence: 99%

A design based on centrifugal inertia of rotational oil film for reducing pressure at shaft hole

Shen,

Xu,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Shaft seal covers a very wide range of machinery and applications. Lip seals, which are used for sealing shafts against the exit or ingress of liquids, are a type of shaft seal. Reducing the wear of the sealing ring and extending its service life can increase the time interval for machine maintenance and inspection. In this paper, a disk structure for reducing the pressure difference between the inside and outside of the lip seals is proposed. The disk structure forms a layer of rotating oil film on the seal ring, so the oil pressure near the seal ring is less than in a sealing chamber. First, based on the similarity principle and the hypothesis of von Kármán, a theoretical model of the rotating oil film was established, and the dominant influence of inertia of circumferential velocity and viscosity of radial velocity on pressure distribution was expounded. Then, an experimental device that can measure pressure distribution and temperature was constructed, and a pressure distribution measurement experiment was conducted. Based on theoretical models and experiments, it was proved that the rotating disk could generate a pressure drop and the pressure drop was a function of the square of the rotating speed. The influence of temperature and oil film thickness was studied, and it was found that the increase in the temperature and oil film thickness weakened rotational flow inertia and enhanced radial flow viscosity, increasing pressure within the oil film. Additionally, it was observed that the oil in the sealing chamber produced a sunken liquid level due to the stirring of the rotating disk, which would reduce the boundary pressure at the periphery of the oil film and produce a greater pressure drop inside the oil film.

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Section: Introductionmentioning

confidence: 99%

A design based on centrifugal inertia of rotational oil film for reducing pressure at shaft hole

Shen,

Xu,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The primary function of radial shaft seals (RSS) is to keep the lubricant inside a machine while allowing for the relative motion of a shaft at its exit from the machine. 1 During shaft rotation, the friction in the sealing contact will cause a significant overtemperature. 2 The tribological conditions in the contact zone accelerate interactions between the rubber material of the seal and the lubricant and may impair the functionality of the sealing system.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Radial Shaft Seal Swelling Using a Special Tribometer and Magnetic Resonance Imaging

et al. 2022

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Compatibility between the rubber material of radial shaft seals and the lubricants to be sealed is an important requirement that customers demand of their lubricant suppliers. Among other effects that may result from incompatibility, the penetration of lubricant components into the rubber (swelling) can impair the seal’s functionality due to changes in its geometry and mechanical behavior. Typically, the penetration of a lubricant into an elastomer is evaluated after an immersion test using volumetric, gravimetric, and extraction measurements. Due to the small changes that need to be detected, such methods may not be sufficient to obtain meaningful results. In this contribution, we use magnetic resonance imaging (MRI) to investigate swelling on special tribometer samples as well as a radial shaft seal that were previously used in component tests. Several combinations of rubbers and lubricants that have proven to be compatible were tested in addition to combinations with expected incompatibilities in real applications. The results indicate that MRI measurements can be used to quantify the penetration depth and potentially also the velocity with which the lubricant diffuses into the rubber, thereby yielding detailed insights into the swelling process of the seal.

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“…However, they are also used in the case of gases and a lack of lubricant, but then the seal is made of a special material, such as polytetrafluoroethylene or plastic. 1…”

Section: Introductionmentioning

confidence: 99%

“…These asperities are deformed by the shaft rotation and become, in effect, micro hydrodynamic wedges and serve to both lift the elastomer surface and, at the same time, pump the oil towards the lip. 1 This phenomenon occurs on both sides of the lip and provides a lubrication film. Due to the fact that the asperity area on the airside is bigger, the inward pumping effect is stronger than the outward pumping one.…”

Section: Introductionmentioning

confidence: 99%

Research into the lubrication of a rotary lip seal using ferrofluid

Szczęch

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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The paper presents the results of research into a hybrid seal which is a combination of standard rotary lip seals and a magnetic fluid seal. To maintain the magnetic fluid in the friction zone region, either a specially shaped pole piece was used or the shaft was modified accordingly. The research study concerns the allowable operating pressure and lubrication conditions in short-term and durability tests after which shaft wear was also assessed. Magnetic fluids with different rheological and magnetic properties were considered. The test results showed that the long-term operation of a hybrid seal is possible. The requirements, however, are the appropriate value of the magnetic field and dynamic viscosity of the magnetic fluid.

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Static Seals

Cited by 10 publications

References 8 publications

A design based on centrifugal inertia of rotational oil film for reducing pressure at shaft hole

A design based on centrifugal inertia of rotational oil film for reducing pressure at shaft hole

Investigation of Radial Shaft Seal Swelling Using a Special Tribometer and Magnetic Resonance Imaging

Research into the lubrication of a rotary lip seal using ferrofluid

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