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井下涡轮发电机轴系减振阻尼器设计与分析
姚本春1,2,张仕民1,谈建平2,张金泽2,田朕2,范进朝3
(1.中国石油大学(北京)机械与储运工程学院,北京 102249;2.中国石油大学(北京)克拉玛依校区工学院,新疆克拉玛依 834000;3.中国石油集团工程技术研究院有限公司,北京 102206)
摘要:
提出一种新型阻尼器以减小基础激励下发电机的轴承力,该阻尼器由周向油膜的挤压效应与端面节流流道的节流效应协同产生阻尼,端面节流流道采用特斯拉阀结构,具有一定单向导通性,既可产生正向阻尼,又可减小油液反流阻力,缓解油膜空化问题;采用内置密封储油腔,整体结构紧凑。对阻尼器结构进行设计,采用数值方法研究阻尼特性及减振性能。结果表明:阻尼系数总体上具有一定非线性,但在低速低频区具有良好的线性度;阻尼器显著减小基础摆动产生的惯性载荷,与未安装阻尼器的对照组相比,径向轴承力下降至53.51%,支撑刚性下降至0.038倍,轴系径向振动位移和速度增长至14.63倍,但二者之积仍小于1,说明支撑刚性下降导致的轴系振动位移增长趋势被抑制,轴系得以有效减振。
关键词:  阻尼器  特斯拉阀  单向导通性  减振  井下涡轮发电机
DOI:10.3969/j.issn.1673-5005.2024.02.021
分类号:
文献标识码:A
基金项目:
YAO Benchun1,2, ZHANG Shimin1, TAN Jianping2, ZHANG Jinze2, TIAN Zhen2, FAN Jinchao3
(1.College of Mechanical and Transportation Engineering in China University of Petroleum (Beijing), Beijing 102249, China; ;2.Faculty of Engineering in China University of Petroleum (Beijing) at Karamay, Karamay 834000, China;3.CNPC Research Institute of Petroleum Engineering Company Limited, Beijing 102206, China)
Abstract:
A new type of damper was proposed to reduce the bearing force of the generator under the basic excitation, in which the damping is generated by the squeeze film effect of the circumferential oil film and the throttling effect of the end throttling flow channel. The end throttling flow channel adopted the Tesla valve structure, which has a certain one-way conductivity. It can not only generate forward flow damping, but also reduce the oil reflux resistance and alleviate the cavitation of oil film. Meanwhile, the damper employed a built-in sealed oil storage chamber, and made the overall structure compact. A damper model was designed and numerical simulation was carried out to study the damping characteristics and the vibration reduction performance. It shows that the damping coefficient is generally nonlinear, but the damping force has good linearity in the low speed and low frequency region. The damper significantly reduces the inertial load generated by the base swing. Compared with the control group without the damper, the radial bearing force decreases to 53.51 %, the support stiffness decreases to 0.038 times, and the radial vibration displacement and speed of the shafting increase to 14.63 times. However, the product of the two is still less than 1, indicating that the growth trend of the shafting vibration displacement caused by the decrease of the support stiffness is suppressed, and the shafting can be effectively reduced.
Key words:  damper  Tesla valve  one-way conductivity  vibration attenuation  downhole turbine generator
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