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| Vibration Response and Structure Optimization of Rotor Bearing Dry Gas Seal System |
| Received:May 21, 2018 Revised:July 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.07.008 |
| KeyWord:nonlinear dry gas seal, stiffness vibration response structural optimization |
| Author | Institution |
| ZHANG Wei-zheng |
College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou , China |
| XUE Jian-xiong |
College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou , China |
| LI Jin-xiao |
College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou , China |
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| Abstract: |
| Objective To improve stability of dry gas sealing system under operating conditions and optimize the parameters of the sealed spiral groove. Methods A two degree of freedom vibration equation was established according to the axial vibration dynamics model of rotor bearing dry gas sealing system. Under specific conditions, the axial stiffness and damping of the film were obtained by multiple solutions of nonlinear equation with Maple software. The Runge-Kutta method in MATLAB software was used to numerically solve the third-order nonlinear vibration equation and draw time histogram and phase diagram under different helix angles. The vibration displacement of static ring under different helix angles was analyzed and compared. Results From the relationship between the spiral angle and the static ring vibration displacement, it can be seen that when α = 74.53°, the static ring vibration displacement was the smallest, its maximum amplitude was 7 μm, the maximum vibration speed was 7 μm/s; when α = 73.78°, the static ring vibration displacement was the largest, the maximum amplitude was 16.5 μm and the maximum vibration speed was 17 μm/s. Changing the helix angle could adjust and reduce the amplitude of the stationary ring. Conclusion Under the dry gas sealing system considering the aerodynamic force of the impeller rotor and the oil film bearing force, increase of the spiral angle can increase the stability of system operation. Increasing the spiral angle (0.5°~0.6°) achieves the best follow-up of the dynamic and static rings. It provides guidance for design of the hermetically sealed structure. |
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