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Title: Hydrodynamically Lubricated Rotary Shaft Having Twist Resistant Geometry

Abstract

A hydrodynamically lubricated squeeze packing type rotary shaft with a cross-sectional geometry suitable for pressurized lubricant retention is provided which, in the preferred embodiment, incorporates a protuberant static sealing interface that, compared to prior art, dramatically improves the exclusionary action of the dynamic sealing interface in low pressure and unpressurized applications by achieving symmetrical deformation of the seal at the static and dynamic sealing interfaces. In abrasive environments, the improved exclusionary action results in a dramatic reduction of seal and shaft wear, compared to prior art, and provides a significant increase in seal life. The invention also increases seal life by making higher levels of initial compression possible, compared to prior art, without compromising hydrodynamic lubrication; this added compression makes the seal more tolerant of compression set, abrasive wear, mechanical misalignment, dynamic runout, and manufacturing tolerances, and also makes hydrodynamic seals with smaller cross-sections more practical. In alternate embodiments, the benefits enumerated above are achieved by cooperative configurations of the seal and the gland which achieve symmetrical deformation of the seal at the static and dynamic sealing interfaces. The seal may also be configured such that predetermined radial compression deforms it to a desired operative configuration, even through symmetrical deformationmore » is lacking.« less

Inventors:
 [1];  [1]
  1. (Houston, TX)
Publication Date:
Research Org.:
Kalsi Engineering, Inc. (Sugarland, TX)
OSTI Identifier:
879186
Patent Number(s):
US 5230520
Application Number:
07/851532
Assignee:
Kalsi Engineering, Inc. (Sugar Land, TX) OAK
DOE Contract Number:
FG03-90ER80939
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Dietle, Lannie, and Gobeli, Jeffrey D. Hydrodynamically Lubricated Rotary Shaft Having Twist Resistant Geometry. United States: N. p., 1993. Web.
Dietle, Lannie, & Gobeli, Jeffrey D. Hydrodynamically Lubricated Rotary Shaft Having Twist Resistant Geometry. United States.
Dietle, Lannie, and Gobeli, Jeffrey D. 1993. "Hydrodynamically Lubricated Rotary Shaft Having Twist Resistant Geometry". United States. doi:. https://www.osti.gov/servlets/purl/879186.
@article{osti_879186,
title = {Hydrodynamically Lubricated Rotary Shaft Having Twist Resistant Geometry},
author = {Dietle, Lannie and Gobeli, Jeffrey D.},
abstractNote = {A hydrodynamically lubricated squeeze packing type rotary shaft with a cross-sectional geometry suitable for pressurized lubricant retention is provided which, in the preferred embodiment, incorporates a protuberant static sealing interface that, compared to prior art, dramatically improves the exclusionary action of the dynamic sealing interface in low pressure and unpressurized applications by achieving symmetrical deformation of the seal at the static and dynamic sealing interfaces. In abrasive environments, the improved exclusionary action results in a dramatic reduction of seal and shaft wear, compared to prior art, and provides a significant increase in seal life. The invention also increases seal life by making higher levels of initial compression possible, compared to prior art, without compromising hydrodynamic lubrication; this added compression makes the seal more tolerant of compression set, abrasive wear, mechanical misalignment, dynamic runout, and manufacturing tolerances, and also makes hydrodynamic seals with smaller cross-sections more practical. In alternate embodiments, the benefits enumerated above are achieved by cooperative configurations of the seal and the gland which achieve symmetrical deformation of the seal at the static and dynamic sealing interfaces. The seal may also be configured such that predetermined radial compression deforms it to a desired operative configuration, even through symmetrical deformation is lacking.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1993,
month = 7
}

Patent:

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  • A hydrodynamically lubricated squeeze packing type rotary shaft seal suitable for lubricant retention and environmental exclusion which incorporates one or more resilient protuberances which cooperate with the gland walls to hold the seal straight in its installation groove in unpressurized and low pressure lubricant retention applications thereby preventing skew-induced wear caused by impingement of abrasive contaminants present in the environment, and which also serve as radial bearings to prevent tipping of the seal within its installation gland. 14 figs.
  • A hydrodynamically lubricated squeeze packing type rotary shaft seal suitable for lubricant retention and environmental exclusion which incorporates one or more resilient protuberances which and cooperate with the gland walls to hold the seal straight in its installation groove in unpressurized and low pressure lubricant retention applications thereby preventing skew-induced wear caused by impingement of abrasive contaminants present in the environment, and which also serve as radial bearings to prevent tipping of the seal within its installation gland.
  • A hydrodynamically lubricated squeeze packing type rotary shaft seal suitable for lubricant retention and environmental exclusion which incorporates one or more resilient protuberances which and cooperate with the gland walls to hold the seal straight in its installation groove in unpressurized and low pressure lubricant retention applications thereby preventing skew-induced wear caused by impingement of abrasive contaminants present in the environment, and which also serve as radial bearings to prevent tipping of the seal within its installation gland. Compared to prior art, this invention provides a dramatic reduction of seal and shaft wear in abrasive environments and provides a significantmore » increase in seal life.« less
  • Flat-face seals can be hydrostatically balanced to give low leakage rates and moderately low contact loads at the faces but the seal balance is extremely sensitive to changes in operation conditions. An increase in temperature or a decrease in pressure is followed by D large decrease in leakage, making it difficult to maintain a proper balance over a wide range of conditions. Excessive unbalance causes scuffing of the faces which leads to a greater unbalance and ultimately to failure. Taper-face seals however, develop a hydrodynamic film between the faces that adjusts to changes in pressure and temperature and can bemore » designed to operate over a wider range oi conditions than the flat-face seals. They can be balanced so that the leak rate is almost independent of the system pressure and only slightly affected by a change in water temperature. On the other hand, the leak rate increases rapidly with speed and the balance must be adjusted to compensate for this. Starting is often difficult because the hydrodynamic film is not available to provide the proper balance, but this can be overcome. When the seals are properly balanced the friction torque of both flat-face and taper-face seals is less than 2 lb in. at 1900 rpm in water at 800lb/in/sup 2/. The results of numerous tests on both flat- face and taper-face seals operating under different conditions are presented in graphical form. (auth)« less
  • A fluid supply system for a rotary cutter head of mining machines comprises a plurality of nozzles for directing air flow inducing sprays in the vicinity of the cutter head, and sensor means for sensing a preselected operational condition of the fluid supply to the nozzles and for deriving a signal indicative of the sensed preselected condition.