The Relationship between Sealing Performance of Mechanical Seals and Composition of Coolants for Automotive Engines

2009 ◽  
pp. 215-215-19 ◽  
Author(s):  
K Kiryu ◽  
O Hirata ◽  
A Yoshino ◽  
K Okada ◽  
H Hirabayashi
Keyword(s):  
Mechanical Seals ◽  
Automotive Engines ◽  
Sealing Performance ◽  
The Relationship

scholarly journals Analysis of Sealing and Leakage Performance of the Subsea Collet Connector with Lens-Type Sealing Structure

2020 ◽  
Vol 8 (6) ◽  
pp. 444
Author(s):  
Feihong Yun ◽  
Gang Wang ◽  
Zheping Yan ◽  
Peng Jia ◽  
Xiujun Xu ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Gain Coefficient ◽  
Leakage Rate ◽  
One Dimensional ◽  
Mechanics Model ◽  
Sealing Performance ◽  
Width Measurement ◽  
Pressure Experiment ◽  
The One ◽  
The Relationship

The contact mechanics model of the metal lens-type sealing gasket is established on the basis of Hertz theory on the macroscopical scale in this paper. The relationship among sealing width, contact pressure, and preload is solved. Based on the structural characteristics of the subsea collet connector, the self-locking characteristics are analyzed to determine the gain coefficient of the sealing structure for the loading thrust. On the microscopic scale, the contact characteristics of the turning lens-type sealing gasket and the hub structure are analyzed by the equivalent replacement of the peak cut coefficient of the one-dimensional sinusoidal wave. The influence of different leakage forms on sealing performance is discussed from both radial and circumferential leakage, and the leakage rate of the lens-type sealing structure is calculated. The hydrostatic pressure experiment of the subsea collet connector with lens-type sealing gasket is carried out, and the correctness of the theoretical analysis is verified from the results of the pressure maintaining, sealing width measurement, and preload conversion.

Analysis of Carrying Capacity and Friction Torque of Friction Pair Fluid-Film for High Parameter Bellows Mechanical Seal

2013 ◽  
Vol 455 ◽  
pp. 207-211
Author(s):  
Mutellip Ahmat ◽  
Zhi Wei Niu ◽  
Guzaiayi Abudoumijiti
Keyword(s):  
Carrying Capacity ◽  
High Speed ◽  
Influence Factor ◽  
Friction Pair ◽  
Scientific Basis ◽  
Friction Torque ◽  
Fluid Film ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
The Relationship

The friction pair for bellows mechanical seal as a friction element is one of the key components for it. In this research, by based on the computational fluid dynamics (CFD) numerical theory, using the Fluent software, corresponding model and parameters, the fluid-film between the clearance of the sealing ring friction pair for the bellows mechanical seal under such the high-temperature, high-pressure, high-speed as complex working conditions is numerically simulated, the relationship between the carrying-capacity of the fluid-film and the temperature, the viscosity of the fluid-film, the relationship between friction torque of the fluid-film and the speed, viscosity of the fluid-film, the influence factor of leakage are obtained. The researching results provide the scientific basis for the optimization designing of the high parameter bellows mechanical seals.

Gas Sealing Performance Study of Metal W Shaped Seal Ring

2014 ◽  
Vol 633-634 ◽  
pp. 68-73 ◽  
Author(s):  
Min Jie Xing ◽  
Qing Xue ◽  
Shuang Fu Suo ◽  
Chun Yan Liu
Keyword(s):  
Rough Surface ◽  
Seal Ring ◽  
Performance Study ◽  
Equipment Operation ◽  
Sealing Performance ◽  
Object Based ◽  
Metal Seal ◽  
Security And Reliability ◽  
Rough Surface Contact ◽  
The Relationship

Gas sealing performance of metal seal ring directly affects the security and reliability of equipment operation. Gas static seals of W-ring is taken as a study object, based on the theory of rough surface contact model and the theory of gas average flow model in the rough surface gap, the gas sealing leakage model is established to analyze the relationship between the leakage and the sealing load and surface roughness parameters.

Enhanced sealing performance with CVD nanocrystalline diamond films in self-mated mechanical seals

2008 ◽  
Vol 17 (7-10) ◽  
pp. 1132-1136 ◽  
Author(s):  
F. Mubarok ◽  
J.M. Carrapichano ◽  
F.A. Almeida ◽  
A.J.S. Fernandes ◽  
R.F. Silva
Keyword(s):  
Diamond Films ◽  
Nanocrystalline Diamond ◽  
Mechanical Seals ◽  
Nanocrystalline Diamond Films ◽  
Sealing Performance

Sealing Performance Evaluation for Bolted Flange Joint with Spiral Wound Gasket Based on the Bolt Force

2019 ◽  
Vol 795 ◽  
pp. 246-253
Author(s):  
Fa Kun Zhuang ◽  
Xiao Peng Li ◽  
Guo Shan Xie ◽  
Jin Shi ◽  
Yian Wang
Keyword(s):  
Performance Evaluation ◽  
Internal Pressure ◽  
Chemical Plant ◽  
Leakage Rate ◽  
Flange Joint ◽  
Rate Model ◽  
Rate Parameter ◽  
Sealing Performance ◽  
Bolted Flange ◽  
The Relationship

Leakage accidents often occur at the bolted flange joints, which are widely used in the petro-chemical plant. This is mainly resulted by the reduction of bolt force during operation. Therefore, bolt force is very important for sealing performance of the joints in service. Based on the leakage rate parameter, the relationship between the bolt force and gasket stress was derived. Moreover, the leakage rate model was established on the basis of bolt force. With this model, the leakage rate can be directly calculated through the bolt force, and the sealing performance can be evaluated. In order to verify this model, corresponding experiments have been performed. It shows that with the internal pressure increasing, the bolt force increases and the gasket stress reduces. There exists a monotonic relationship between the bolt force and gasket stress. The theoretical gasket stress value corresponds well with the experimental value. The calculated leakage rates for the joints also agree well with the experimental value. Then, it is feasible to evaluate the sealing performance for the bolted flange joints based on the bolt force.

Effects of Nut Thinning due to Corrosion on the Sealing Performance in Bolted Flange Joints Under Internal Pressure

2018 ◽  
Author(s):  
Tsutomu Kikuchi ◽  
Hirokazu Tsuji ◽  
Daichi Tsurumi
Keyword(s):  
Internal Pressure ◽  
Damage Evaluation ◽  
Track Record ◽  
A Value ◽  
Sealing Performance ◽  
Bolted Flange ◽  
The Relationship

In the damage evaluation (and analysis) of the bolted flange joints, it is most important to evaluate the reduction in the sealing performance. Although the marginal nut height found by Alexander’s theory [1] serves as a value smaller about 20% than standard nut height, even if it becomes thin 20% or more on a track record and experience, leakage does not occur. In this study the effects of nut thinning due to corrosion on the sealing performance in 3-inch bolted flange joints under internal pressure by use of FEM calculations. The following results are obtained the relationship between stripping bolt load and nut height is developed, and the marginal nut height for the sealing performance is calculated.

Influence of Geometry on Rotordynamic Coefficients of Brush Seal

2017 ◽  
Vol 34 (2) ◽  
Author(s):  
Yuan Wei ◽  
Earl H. Dowell ◽  
Zhaobo Chen ◽  
Yinghou Jiao ◽  
Zhouqiang Zhang
Keyword(s):  
Aerodynamic Force ◽  
Dynamic Pressure ◽  
Reaction Force ◽  
Operating Conditions ◽  
Rotordynamic Coefficients ◽  
Geometric Configurations ◽  
Brush Seal ◽  
Sealing Performance ◽  
Flow Features ◽  
The Relationship

AbstractIt has been observed that the geometry of a brush seal has a significant effect on the sealing performance. However, the relationship between rotordynamic coefficients and geometry factors of the brush seal itself are rarely considered. In this article, the rotordynamic coefficients of a typical single-stage brush seal for different geometries and operating conditions were numerically analyzed using CFD RANS solutions coupled with a non-Darcian porous medium model. The reaction force which plays an essential role in rotordynamic coefficients was obtained by integrating the dynamic pressure distribution. The influence of the bristle pack thickness, fence height, clearance size and other working condition parameters on aerodynamic force, stiffness coefficients, and damping coefficients of brush seal were presented and compared. In addition, the effects of various geometric configurations on pressure and flow features were also discussed.

A Stress Analysis of Pipe Flange Connections

1991 ◽  
Vol 113 (4) ◽  
pp. 497-503 ◽  
Author(s):  
T. Sawa ◽  
N. Higurashi ◽  
H. Akagawa
Keyword(s):  
Maximum Stress ◽  
Three Dimensional ◽  
Theory Of Elasticity ◽  
Contact Stresses ◽  
Load Factor ◽  
Dimensional Theory ◽  
Body Contact ◽  
Sealing Performance ◽  
Three Body ◽  
The Relationship

The use of pipe flange connections is standardized in the codes of JIS, ASME, DIN and so on. However, these codes are almost entirely dependent on experience, and subsequently some problems concerning pipe flange connections have been encountered. In the present paper, the distribution of contact stresses which governs the sealing performance is analyzed as a three-body contact problem, using an axisymmetrical three-dimensional theory of elasticity. The effects of the stiffness and the thickness of raised face metallic gaskets on the contact stresses and the effective gasket seating width are shown by numerical calculation. Moreover, stresses produced on the hub, the load factor (the relationship between an increment of bolt axial force and an internal pressure), and the maximum stress caused in bolts are analyzed. For verification, experiments are carried out. The analytical results are satisfactorily consistent with the experimental results.

The Effect of Anisotropy on the Percolation Threshold of Sealing Surfaces

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Zhimeng Yang ◽  
Jianhua Liu ◽  
Xiaoyu Ding ◽  
Feikai Zhang
Keyword(s):  
Fourier Transform ◽  
Theoretical Result ◽  
Fast Fourier Transform ◽  
Percolation Threshold ◽  
Rough Surface ◽  
Conjugate Gradient ◽  
Surface Anisotropy ◽  
Sealing Performance ◽  
The Relationship ◽  
Theoretical Results

The percolation threshold strongly affects sealing performance. This paper investigates the relationship between the percolation threshold and the rough surface anisotropy, which is represented by the Peklenik number, γ. A series of anisotropic rough surfaces were generated and the conjugate gradient-fast Fourier transform (CG-FFT) method was used to determine the percolation threshold. The percolation threshold was found to be A/A0≈0.484±0.009 (averaged over 45 surfaces) was established for an isotropic rough surface (γ=1). Furthermore, it was also found that the percolation threshold decreased from A/A0≈0.528±0.011 to A/A0≈0.431±0.008 as 1/γ increased from 0.6 to 2. Our results differ from the theoretical result of Persson et al., where A/A0=γ/(1+γ). Comparing our calculated results with the theoretical results established the presence of an intersection value of 1/γ that was related to the effect of elastic deformation on the percolation threshold. When 1/γ was smaller than the intersection value, our calculated results were lower than the theoretical ones; and when 1/γ was greater than the intersection value, our calculated results were higher than the theoretical ones.

Optimization of depositing uniform and wear-resistant diamond films on massive mechanical seals

2018 ◽  
Vol 70 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Yun He ◽  
Fanghong Sun ◽  
Xuelin Lei
Keyword(s):  
Diamond Films ◽  
Nanocrystalline Diamond ◽  
Dynamics Simulation ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
Diamond Coatings ◽  
Wear Resistant ◽  
Content Type ◽  
Substrate Rotation ◽  
Sealing Performance

Purpose This study aims to obtain diamond-coated mechanical seals with improved sealing performance and considerable cost. To achieve this purpose, the study focuses on depositing uniform, wear-resistant and easily polished diamond coatings on massive mechanical seals in a large-scale vacuum chamber. Design/methodology/approach The computational fluid dynamics simulation test and its corresponding deposition experiment are carried out to improve the uniformity of diamond films on massive mechanical seals. The polishing properties and sealing performance of mechanical seals coated with three different diamond films (microcrystalline diamond [MCD], nanocrystalline diamond [NCD] and microcrystalline/nanocrystalline diamond [MNCD]) and uncoated mechanical seals are comparatively studied using the polishing tests and dynamic seal tests to obtain the optimized diamond coating type on the mechanical seals. Findings The substrate rotation and four gas outlets distribution are helpful for depositing uniform diamond coatings on massive mechanical seals. The MNCD-coated mechanical seal shows the advantages of high polishing efficiency in the initial polishing process and excellent wear resistance and self-lubrication property in the follow-up polishing period because of its unique composite diamond film structures. The MNCD-coated mechanical seal shows the longest working life under dry friction condition, about 14, 1.27 and 1.9 times of that for the uncoated, MCD and NCD coated mechanical seals, respectively. Originality/value The effect of substrate rotation and gas outlets distribution on temperature and gas flow field during diamond deposition procedure is simulated. The MNCD-coated mechanical seal exhibits a superior sealing performance compared with the MCD-coated, NCD-coated and uncoated mechanical seals, which is helpful for decreasing the operating system shut-down frequency and saving operating energy consumption.

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