Papers by Keyword: Mechanical Seal

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Authors: Jing Hao Li, Xiang Feng Liu, Wei Feng Huang, Yu Ming Wang
Abstract: A finite element cavitation algorithm to Reynolds equation is presented for the calculation of the flow field in the film between the faces of the mechanical seal. As using free mesh, the algorithm is particularly useful for the computational domain which shape is complex. The JFO boundary condition which satisfies mass conservation is implemented by introducing Kumar and Booker’s algorithm. A non-traditional finite element method is derived to avoid the process of the functional analysis and can obtain the flow rate on boundaries conveniently. The results show that the algorithm is reliable, effective and correspond to the literature results. Moreover, the algorithm can be also used for the sliding bearings lubrication problem which shows the well adaptability.
Authors: Yi Bo Fan, Feng Shou Gu, Andrew Ball
Abstract: This paper presents the use of the MUSIC algorithm improved by higher order statistics (HOS) to extract key features from the noisy acoustic emission (AE) signals. The low signal-to-noise ratio of AE signals has been identified as a main barrier to the successful condition monitoring of pump mechanical seals. Since HOS methods can effectively eliminate Gaussian noise, it is possible in theory to identify a change in seal conditions from AE measurements even with low signal-to-noise ratios. Tests conducted on a test rig show that the developed algorithm can successfully detect the AE signal generated from the friction of seal faces under noisy conditions.
Authors: Min Zhou, Hua Bin Wen, Wen Hui Wang, Yong Hu, Yan Shi, Liang Li
Abstract: Regarding the issue of short service life of mechanical seal of HITM pump in polyester production, this paper analyzes its causes, carries out the modeling, theoretical analysis, and discussion concerning the temperature flow field of seal faces, and puts forward the measure for improving the mechanical seal unit.
Authors: Mikiko Oyabu, Jun Tomioka
Abstract: A new average flow model to analyze the lubrication characteristics of mechanical seals with parallel sealing faces is proposed. The present model determines the flow factors considering the side leakage under the operating condition equivalent to that in the mechanical seal. The correction factor for the expected hydrodynamic pressure generated by the relative motion of rough surfaces is also defined. The results are compared with those based on the Patir’s average flow model and show that the present model can be effective for the analysis of the lubrication characteristics of mechanical seals with parallel sealing faces.
Authors: Mutellip Ahmat, Zhi Wei Niu, Guzaiayi Abudoumijiti
Abstract: 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.
Authors: Hai Yang Zhang, Wei Bing Zhu, Zhou Gang
Abstract: According to the fluid hydrodynamic lubrication theory, and the structural characteristics of the convergence gap seal is combined, the effect of differential pressure and centrifugal force should be considered, then the convergent wedge gap mechanical seals flow field numerical model is established and the influence of the leakage factors are researched, including the geometric parameters and operating parameters. Research has shown that the amount of leakage and the seal clearance were positively correlated. And the larger turning Angle is, the bigger correlation becomes, however, it is negatively correlated with speed and turning radius, the seal leakage is impeded by the centrifugal force and the larger turning radius is, the smaller leakage becomes.
Authors: Xin Qi Yu, Pei Ying Peng, Hui Qin Gao, He Fang Zhang
Abstract: A calculation model is developed for mechanical seals with a laser-textured micro-pore face. The dimensionless hydrodynamic pressure distribution on the seal face at various operating conditions and micro-pore geometry parameters is obtained from a solution of the Reynolds equation by the finite difference method. An optimum micro-pore geometry parameter is found and consistent with experimental results. Results of parametric study demonstrate that the substantial hydrodynamic effect can be produced on the seal face with micro-pores.
Authors: Jing Jing Zhai, Ying Liu, Zhi Gao, You Bin Lin
Abstract: Due to film thickness is one of important parameters which has great influence on the performance of mechanical seal, the accuracy of thickness measurement is significant on mechanical seal condition monitoring and performance study. Some limitations were faced when common sensors were used under water of seal face. As new type sensor, FOS has many advantages such as smaller diameter, higher sensitivity, better anti-jamming ability, larger applicable scope than common sensors. In this paper, an enclosed and rotatable calibration test-bed was designed to imitate seal structure by which the feasibility and specifications of FOS application to measuring the seal film thickness had been discussed
Authors: Jie Gao, Peng Yun Song, Xiao Yun Hu, Fang Bo Ma
Abstract: It is a key technology in the design and application of mechanical seals as how to determine and control its face temperature. According to the explicitly defined heat conduction angle, supposed the surfaces of the stator ring are insulation, and the heat produced by friction of seal faces transfers only through the rotor ring along the heat conduction angle, an approximate analytical method calculating the end face temperature distribution of mechanical seal was developed for mixed friction condition in this paper. The heat conduction angle, angular velocity, contact pressure and other factors and its law on end face temperature distribution have also been analyzed in this paper. The results of this method for calculating the end face temperature are much closer to the reality, compared with other approximate analytical methods.
Authors: Jian Feng Zhou, Bo Qin Gu
Abstract: The thermo-hydrodynamic effect in the spiral groove mechanical seal was investigated. The coupling analysis of the fluid film and the thermal deformation of sealing rings was carried out, the separation angle obtained, and the shape of the gap between the two deformed end faces determined. The results indicate that the increase of the temperature of the fluid film and the thermal deformation of the sealing rings cause the increase of the leakage rate. There exists a critical rotating speed, when the rotating speed is lower than the critical speed, the bearing force increases with the increase of the rotating speed, and once the rotating speed is higher than the critical speed, the bearing force decreases reversely. The thermal deformation weakens the hydrodynamic effect of the spiral groove mechanical seals.
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