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Title: Low torque hydrodynamic lip geometry for rotary seals

Abstract

A hydrodynamically lubricating geometry for the generally circular dynamic sealing lip of rotary seals that are employed to partition a lubricant from an environment. The dynamic sealing lip is provided for establishing compressed sealing engagement with a relatively rotatable surface, and for wedging a film of lubricating fluid into the interface between the dynamic sealing lip and the relatively rotatable surface in response to relative rotation that may occur in the clockwise or the counter-clockwise direction. A wave form incorporating an elongated dimple provides the gradual convergence, efficient impingement angle, and gradual interfacial contact pressure rise that are conducive to efficient hydrodynamic wedging. Skewed elevated contact pressure zones produced by compression edge effects provide for controlled lubricant movement within the dynamic sealing interface between the seal and the relatively rotatable surface, producing enhanced lubrication and low running torque.

Inventors:
;
Publication Date:
Research Org.:
Kalsi Engineering Inc., Houston, TX (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1195937
Patent Number(s):
9,086,151
Application Number:
13/242,107
Assignee:
Kalsi Engineering Inc. (Houston, TX) CHO
DOE Contract Number:
FG02-05ER84206
Resource Type:
Patent
Resource Relation:
Patent File Date: 2011 Sep 23
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Dietle, Lannie L., and Schroeder, John E.. Low torque hydrodynamic lip geometry for rotary seals. United States: N. p., 2015. Web.
Dietle, Lannie L., & Schroeder, John E.. Low torque hydrodynamic lip geometry for rotary seals. United States.
Dietle, Lannie L., and Schroeder, John E.. 2015. "Low torque hydrodynamic lip geometry for rotary seals". United States. doi:. https://www.osti.gov/servlets/purl/1195937.
@article{osti_1195937,
title = {Low torque hydrodynamic lip geometry for rotary seals},
author = {Dietle, Lannie L. and Schroeder, John E.},
abstractNote = {A hydrodynamically lubricating geometry for the generally circular dynamic sealing lip of rotary seals that are employed to partition a lubricant from an environment. The dynamic sealing lip is provided for establishing compressed sealing engagement with a relatively rotatable surface, and for wedging a film of lubricating fluid into the interface between the dynamic sealing lip and the relatively rotatable surface in response to relative rotation that may occur in the clockwise or the counter-clockwise direction. A wave form incorporating an elongated dimple provides the gradual convergence, efficient impingement angle, and gradual interfacial contact pressure rise that are conducive to efficient hydrodynamic wedging. Skewed elevated contact pressure zones produced by compression edge effects provide for controlled lubricant movement within the dynamic sealing interface between the seal and the relatively rotatable surface, producing enhanced lubrication and low running torque.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 7
}

Patent:

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  • A hydrodynamically lubricating geometry for the generally circular dynamic sealing lip of rotary seals that are employed to partition a lubricant from an environment. The dynamic sealing lip is provided for establishing compressed sealing engagement with a relatively rotatable surface, and for wedging a film of lubricating fluid into the interface between the dynamic sealing lip and the relatively rotatable surface in response to relative rotation that may occur in the clockwise or the counter-clockwise direction. A wave form incorporating an elongated dimple provides the gradual convergence, efficient impingement angle, and gradual interfacial contact pressure rise that are conducive tomore » efficient hydrodynamic wedging. Skewed elevated contact pressure zones produced by compression edge effects provide for controlled lubricant movement within the dynamic sealing interface between the seal and the relatively rotatable surface, producing enhanced lubrication and low running torque.« less
  • A hydrodynamically lubricating geometry for the generally circular dynamic sealing lip of rotary seals that are employed to partition a lubricant from an environment. The dynamic sealing lip is provided for establishing compressed sealing engagement with a relatively rotatable surface, and for wedging a film of lubricating fluid into the interface between the dynamic sealing lip and the relatively rotatable surface in response to relative rotation that may occur in the clockwise or the counter-clockwise direction. A wave form incorporating an elongated dimple provides the gradual convergence, efficient impingement angle, and gradual interfacial contact pressure rise that are conducive tomore » efficient hydrodynamic wedging. Skewed elevated contact pressure zones produced by compression edge effects provide for controlled lubricant movement within the dynamic sealing interface between the seal and the relatively rotatable surface, producing enhanced lubrication and low running torque.« less
  • A hydrodynamic sealing assembly including a first component having first and second walls and a peripheral wall defining a seal groove, a second component having a rotatable surface relative to said first component, and a hydrodynamic seal comprising a seal body of generally ring-shaped configuration having a circumference. The seal body includes hydrodynamic and static sealing lips each having a cross-sectional area that substantially vary in time with each other about the circumference. In an uninstalled condition, the seal body has a length defined between first and second seal body ends which varies in time with the hydrodynamic sealing lipmore » cross-sectional area. The first and second ends generally face the first and second walls, respectively. In the uninstalled condition, the first end is angulated relative to the first wall and the second end is angulated relative to the second wall. The seal body has a twist-limiting surface adjacent the static sealing lip. In the uninstalled condition, the twist-limiting surface is angulated relative to the peripheral wall and varies along the circumference. A seal body discontinuity and a first component discontinuity mate to prevent rotation of the seal body relative to the first component.« less
  • A seal for the vertical rotary shafts of centrifugal pumps is designed so that the pump can be used for long periods, e.g., in the presence of radioactivity, without maintenance other than oiling the motor or shaft. The seal has one side exposed to the atmosphere and the other to the pump intake and means for feeding lubricant to the side toward the atmosphere and for preventing suction of the lubricant to the other side in the case of seal leakage. (D.L.C.)
  • A metallic regenerator seal is provided having multi-layer coating comprising a NiCrAlY bond layer, a yttria stabilized zirconia (YSZ) intermediate layer, and a ceramic high temperature solid lubricant surface layer comprising zinc oxide, calcium fluoride, and tin oxide. Because of the YSZ intermediate layer, the coating is thermodynamically stable and resists swelling at high temperatures. 2 figs.