An Analysis of Self-Energized Hydrostatic Shaft Seals

1969 ◽  
Vol 91 (4) ◽  
pp. 658-667 ◽  
Author(s):  
M. L. Adams ◽  
R. J. Colsher
Keyword(s):  
Incompressible Fluid ◽  
Laminar Regime ◽  
Sample Problem ◽  
Shaft Seal ◽  
Maximum Stiffness ◽  
Shaft Seals ◽  
Orifice Size

An analysis of a self-energized hydrostatic shaft seal operating with incompressible fluid in the laminar regime is presented. Dimensionless results are optimized for maximum stiffness. Comparisons are made between full annulus and sectored annulus recess configurations. It is shown that translational and torsional stiffnesses are critically dependent upon orifice size. A sample problem is included to demonstrate use of equations, design curves and criteria developed.

Analysis of Fluid Flow in the Sealing Gap of Radial Shaft Seals and Elastic Deformation of the Sealing Surface

2021 ◽  
pp. 1-19
Author(s):  
Markus Schulz ◽  
Marius Hagmayer ◽  
Matthias Baumann ◽  
Frank Bauer
Keyword(s):  
Fluid Flow ◽  
Elastic Deformation ◽  
Research Methodology ◽  
Test Procedure ◽  
Shaft Seal ◽  
Rotation Direction ◽  
Testing Facility ◽  
Shaft Seals ◽  
Evaluation Matrix ◽  
Sealing Gap

Abstract The function of a radial shaft seal bases on interactions between the sealing edge and the shaft counterface. To better understand these mechanisms, a look inside the sealing contact was taken. The procedure and the testing facility are presented in this paper. In addition, a research methodology was developed, to systematically analyse the fluid flow and the distortion of the sealing surface of shaft seals. The results of the test procedure are documented in an evaluation matrix that allows the comparison of sealing systems with different worn sealing edges. For example, the tests show an influence of the rotation direction of the shaft during running-in on the formation of leakage channels or oil collecting chambers within the sealing contact.

Fluid Inertia Effects on the Load Capacity of Spherical Spiral Groove Bearings

1986 ◽  
Vol 108 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Yuichi Sato
Keyword(s):  
Incompressible Fluid ◽  
Centrifugal Force ◽  
Load Capacity ◽  
Inertia Force ◽  
Laminar Regime ◽  
Fluid Inertia ◽  
Spiral Groove ◽  
Centrifugal Effect ◽  
Inertia Effects ◽  
Theoretical Results

The effects of centrifugal force on the load capacity of inwardly and outwardly spherical spiral groove bearings, operated in laminar regime and lubricated with incompressible fluid, have been investigated. The narrow groove theory has been generalized to include the centrifugal effect of lubricant. The analysis demonstrates that the fluid inertia force reduces the load capacity of an inwardly pumping bearing, whereas it increases the load capacity of an outwardly pumping bearing. The theoretical results are compared with the experimental ones.

Advanced Screw Pumps for Heavy Fuel Oil Conditioning Systems

2003 ◽  
Author(s):  
Christoph K. Schneider ◽  
Hans-J. Naucke ◽  
Ju¨rgen M. Wolf
Keyword(s):  
State Of The Art ◽  
Magnetic Coupling ◽  
Systematic Investigation ◽  
Fuel Oil ◽  
Shaft Seal ◽  
Heavy Fuel Oil ◽  
Marine Fuel ◽  
Counter Measures ◽  
Current State ◽  
Shaft Seals

Failures of screw pumps in marine fuel oil conditioning systems are some of the most frequent incidents affecting a ship’s availability. In order to identify the possible reasons a systematic investigation was initiated. The result makes obvious that most of the defects are related to shaft seal failures. The respective scenarios of seal defects are discussed in detail as well as possible counter measures. However, the results finally have revealed that pump designs with mechanical shaft seals will always incur a distinct risk of breakdown. A decisive step forward in solving this problem is to completely avoid the shaft seal. The alternative technology of hermetically sealed pumps with magnetic coupling will be presented in its current state of the art.

ZILLOY 15

Alloy Digest ◽  
1959 ◽  
Vol 8 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
New Jersey ◽  
Physical Properties ◽  
Tensile Properties ◽  
Base Alloy ◽  
Heat Treating ◽  
Alloy Strip ◽  
Maximum Stiffness

Abstract Zilloy 15 is a zinc-base alloy strip recommended for drawn or mildly formed parts requiring maximum stiffness. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as casting, forming, heat treating, and joining. Filing Code: Zn-6. Producer or source: New Jersey Zinc Company.

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