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Encyclopedia > Labyrinth seal
A simple labyrinth seal
A simple labyrinth seal

A labyrinth seal is a mechanical seal that fits around a shaft to prevent the leakage of oil or other fluids. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Compression seal example A mechanical seal is a device which helps join systems or mechanisms together by preventing leakage (e. ... A shaft can be Look up shaft in Wiktionary, the free dictionary. ...

A labyrinth seal is composed of many straight threads that press tightly inside another shaft, or stationary hole, so that the fluid has to pass through a long and difficult path to escape. Sometimes 'threads' exist on the outer and inner portion. These interlock, to produce the long characteristic path to slow leakage. For labyrinth seals on a rotating shaft, a very small clearance must exist between the tips of the labyrinth threads and the running surface.

Labyrinth seals on rotating shafts provide non-contact sealing action by controlling the passage of fluid through a variety of chambers by centrifugal motion, as well as by the formation of controlled fluid vortices. At higher speeds, centrifugal motion forces the liquid towards the outside and therefore away from any passages. Similarly, if the labyrinth chambers are correctly designed, any liquid that has escaped the main chamber, becomes entrapped in a labyrinth chamber, where it is forced into a vortex-like motion. This acts to prevents its escape, and also acts to repel any other fluid. Because these labyrinth seals are non-contact, they do not wear out.

mainly use high rpm spindle

Turbines use labyrinth seals due to the lack of friction, which is necessary for high rotational speeds. A Siemens steam turbine with the case opened. ...

Labyrinth seals are also found on pistons, which use them to store oil and seal against combustion explosions, as well as on other non-rotating shafts. In these applications, it is the long and difficult path and the formation of controlled fluid vortices plus some limited contact-sealing action that creates the seal.

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  Results from FactBites:
Seal means - Patent 4453722 (1093 words)
Sealing means as in claim 1 wherein said back-up seal is a piston-like ring bearing up against a sealing surface formed on said first annular member having sufficient tolerance to allow a predetermined leakage to flow therethrough when said bellows fails and permits the flow of air.
The back-up ring seal is disposed axially in a line-on-line relationship with the primary carbon seal to maintain a pressure balance on the carbon seal and allows a predetermined leakage should the bellows fail and leak.
The carbon seal is pressure balanced closed in the event of bellows failure and anti-rotational lugs serve to prevent the primary face seal from spinning as a result of being driven by the seal plate.
GMN Bearings Gap Seals technology (587 words)
Sealing principle: The basic principle of a labyrinth seal is based on the geometric shape of the labyrinth which causes some turns of the contaminant on its way to penetrate the seal.
With the GMN Gap Seal the efficiency of the centrifugal force to accelerate the contaminant radially to throw it away from the sealing gap is increased by the conic envelope of the labyrinth.
To penetrate the seal the contaminant has to overcome the centrifugal force by creeping from the larger labyrinth diameter facing the contaminant to the smaller diameter on the "dry" side of the seal.
  More results at FactBites »



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