Research On Seal Fluid Excitation And Tower Pipeline Vibration Damping Technology

Vibration problem is one of the most important factors which result in the equipment becoming invalid. Rotating machinery seal excitation and pipeline vibration are the important components of engineering vibration problems. Two important causes which lead to seal excitation are fluid circumferential flow and rotor eccentricity. Aiming at these two reasons, the damping seal technology and a seal rotor eccentric adaptive adjusting device was researched and designed in this article.(1) The mechanism of labyrinth seal excitation was analyzed. With using CFD software, the gap flow field of turbine pump centrifugal wheel comb labyrinth was simulated and pressure or velocity distribution in the gap were obtained. The reason that labyrinth seal is easy to cause fluid excitation was well explained. In the meantime, the effect rules of different structural parameters (rotor eccentricity ratio, seal clearance, tooth thickness, sealing teeth and entry pre-whirl) on seal leakage and dynamic characteristics were systematically studied. Finally, the theoretical basis for turbine pump labyrinth seal structure design and optimization were provided.(2) The comb seal was promoted to hole-pattern damper seal and the mechanism how damper seal (hole-pattern seal and honeycomb seal) suppresses the fluid excitation was studied. The hole-pattern damper seal gap fluid flow field was simulated with using CFD software. Reasons that the damper seal can suppress fluid excitation or improve the rotor-seal system stability are analyzed. Furthermore, the influence rules of different hole-pattern damper seal structural parameters (holes arrangement way, holes number in circumferential direction, hole depth and seal clearance) on damper seal leakage and dynamic characteristic are systematically studied. A theoretical basis for hole-pattern seal structure design or optimization and fluid excitation inhibition are provided.(3) Aiming at the rotor eccentricity which leads to the seal fluid excitation from the source, a seal eccentric adaptive adjusting device was designed and its seal excitation inhibition effects under different rotate speeds or spring stiffness was experimentally researched.(3) Aiming at the heavy vibration problem on long-thin pipelines of high tower equipment, the vibration inhibition effect on pipeline by using viscous damper was studied. Through understanding the locale tower piping layout and vibration situation or using the finite element analysis software ANSYS and SAP2000, the cause of pipeline vibration was analyzed. In the meantime, vibration control effects under different viscous damper installation locations were simulated. A reasonable vibration damping plan was determined and its locale installation got the guide. Finally, the plan makes a significant damping effect.