【摘要】 特高压输电技术具有较高安全性和可靠性,且输电效率高,是近年来具有较大发展潜力的新技术。安装导线的管道在运行过程中会产生热胀冷缩变形,所以需要采用膨胀节进行管道位移补偿。而膨胀节种类较多,不同结构的膨胀节对输送管线的影响也有所不同,因此选择合适的膨胀节类型显得尤为重要。为了探究膨胀节结构对特高压输送管线强度的影响,文中采用CaesarⅡ软件对特高压输电管线进行了柔性分析,比较了管线中安装单式轴向型和直管压力平衡型膨胀节两种方案的应力分布和支座反力。结果表明,直管压力平衡型膨胀节方案管线的一次应力较单式轴向型膨胀节方案大,二次应力两者基本相同。单式轴向型方案的固定支架处反力远远大于直管压力平衡型方案。更多还原

【Abstract】 UHV transmission technology has the advantage of high safety and reliability as well as high transmission efficiency,and it is a new technology with great development potential in recent years.The pipeline of the installation wire will generate the deformation because of the thermal expansion and contraction during the operation,so the expansion joint is required to compensate the displacement of the pipeline.There are many types of expansion joints,and the expansion joints of different structures have different effects on the pipeline.Therefore,it is particularly important to choose the appropriate type of expansion joint.In order to study the effect of expansion joint structure on the strength of UHV transmission pipelines,Caesar II software is used to analyze the flexibility of UHV transmission pipelines in the paper,and the stress distribution and reaction force are compared while the single axial expansion joint and the straight-pipe pressure balanced expansion joint are installed on the pipeline respectively.The results show that the primary stress of the pressure balanced expansion joint is larger than that of the single axial expansion joint,but the secondary stress is almost the same.The reaction force of the single axial expansion joint is much larger than that of the pressure balanced expansion joint.更多还原