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Research on Numerical Analysis and Optimization of Mechanical Sealing Performance

Author: ZhuXueMing
Tutor: LiuZhengLin
School: Wuhan University of Technology
Course: Vehicle Operation Engineering
Keywords: Mechanical seal Thermal - structural coupling analysis Frictional heat Thermal transient analysis Sealing performance optimization
CLC: TB42
Type: Master's thesis
Year: 2005
Downloads: 691
Quote: 17
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Abstract


Under heavy load conditions, the mechanical seal faces prone to local high-temperature and high-stress, serious impact on the overall performance of the sealing device. As the traditional theoretical calculation of limited sealing performance parameters accuracy, it is therefore an urgent need for a scientific system performance calculation model of the mechanical seal. Based on ANSYS software platform, comprehensive new achievements in the theoretical study of the mechanical seal performance at home and abroad, from the static structure, steady-state thermal - structural coupling and transient three angles established a finite element model of the the calculated mechanical seal performance, and The sealing performance optimization. Static analysis of the structure, as the starting point deformation analysis, analysis of isolated body and the overall lack of bonding method, based on the overall contact contact theory, ensure the coordination of the end face of force and deformation, the end face of the contact force automatic solution and static seal rings (floating rings) balance. Structural analysis showed that the sealing face is tapered in the forces and torques generated deformation, to form a contact closure area and a tapered opening area, and stress concentration in the contact zone. Heat - structure coupling steady-state analysis, the direct coupling of thermal and structural field; the friction thermal load based on contact pressure, Add the APDL functional, two basic equivalent coupling temperature degrees of freedom and the definition of a large contact thermal conductivity The method of allocation, and improve loading accuracy based on cyclic iteration. The steady-state analysis results indicate that the soft and hard material pairing vice, the frictional heat leads to the conical deformation of the seal face is increased, the contact area reduced, and the contact area within the local temperature, high contact pressure and high stress, wherein due to the movable ring material elastic modulus a large amount of its end face of stress is high, especially in the weeks to highlight the compressive stress. Ideas and Table thermal - structural coupling transient analysis, using the definition of a small time step program to avoid too large due the frictional heat load repeated calculation led to the initial moment, and the contact pressure is calculated based on the previous time, one time thermal load The array of ways to achieve the dynamic frictional heat add. The ideal transient analysis examples show that the seal face loading process to produce the effect of the heat engine, stable end face of the parameters a steady decrease in the load shedding process. Wear and friction state project actual load shedding sealing performance depends primarily on the end face of the liquid film stability, fast load shedding due to end taper change easily lead to the liquid film instability and deterioration of the sealing performance. Sealing performance optimization, the angle from contact uniformity within the type of contact, with the ANSYS optimization module optimized computing stationary ring axial extension length optimization to improve the contact uniformity in ensuring contact conditions; for the problem of the local temperature rise of the sealing face, the appropriate washing and rinsing the limits to the performance of the seal faces, the results show that appropriate flushing can significantly improve the seal performance, rinse limit can also improve the sealing performance, to but currently far can not be achieved.

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CLC: > Industrial Technology > General industrial technology > Industrial common technology and equipment > Sealing technology
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