Papers by Author: Xu Dong Peng

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Authors: Xu Dong Peng, S.E. Sheng, J.Y. Li, X.M. Pan, S.X. Bai
Abstract: A Reynolds equation is presented for the hydrodynamic pressure components between the two faces of a partially or fully laser surface textured mechanical seal (LST-MS) by considering the hydrostatic and hydrodynamic characteristics and cavitation within the sealing fluid film. Galerkin’s method is used to set up the finite element model for the Reynolds equation. The effects of geometric parameters of the spherical dimple on seal performance of a LST-MS are studied. The texturing parameters are numerically optimized to obtain the maximum opening force and/or the maximum ratio of fluid film stiffness to leakage rate. It is shown that a full LST-MS has stronger hydrodynamic effect and lower frictional torque between the two faces than that of a partial LST-MS, but the latter works at a less leakage and a more stable working state. Thus a partial LST-MS is recommended for practical application for its better comprehensive seal performance.
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Authors: Xin Liu, Xu Dong Peng, Xiang Kai Meng
Abstract: Based on the principle of a screw seal, a new type of seal consisting of a series of screw seals was developed and named as an axial pumping baffle seal. A theoretical analysis model was presented for such a seal which was developed to be used in nuclear coolant pumps. The feasibility of sealing high-pressure medium for such a seal had been proved. The variation of leakage rate and pressure distribution between a tooth and a sleeve with the number of seal stages and the geometrical parameters of screws was studied. The sealing mechanism was presented. The results showed that such a new seal maybe replace the first stage seal of a series mechanical seal used in a nuclear pump. When the number of screw seals is about 9, the reliability is ensured by the cooperation of the “attack” of the screw seal and the “defense” of the 180° sharp back bend.
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