机械

本文基于机械密封需要双向承压且对泄漏量有苛刻要求的工况,提出了采用双向平衡型上游泵送机械密封这一解决方案。该方案兼具双向平衡型和上游泵送的结构,既适应工况变化引起的内侧和外侧的压力变化,又可实现泵出口侧向电机侧的零泄漏。在详细设计时,以泄漏量为设计原则,基于零逸出泄漏模型,求解密封主要参数。在优化设计时,利用ANSYS软件对动环加载离心力、介质压力、环体温度,对静环加载介质压力、环体温度、弹簧力,实现离心应力、介质压力、热应力的耦合,模拟应用条件下的受力状态及变化规律,并根据变化规律调整应力分布,避免应力集中,优化端面变形,利于机械密封的正常、稳定、可靠运行。研究表明,合理选型和设置密封参数,耦合状态下的优化设计可实现内外侧压力交替变化下的零泄漏。

Based on the working conditions needs the mechanical seal bears bi-directional pressure and has harsh requirements for leakage, the paper proposes a solution of using two-way balanced and upstream pumping mechanical seal. This kind of mechanical seal has structures of both bi-directional balance and upstream pumping, which can not only cause change of internal and external pressures, but also can realize the zero leakage. With leakage amount as design principle and based on zero run-off & leakage model, main parameters of the seal are solved. In the optimization design, ANSYS software is used for the analysis. The centrifugal force, medium pressure and the ring body temperature are exerted on rotating ring; the medium pressure, the ring body temperature and spring force are exerted on static ring. The inlay structure of ring components can achieve the coupling of medium pressure, centrifugal force and heat load and simulation the stress state,also get its variation law under the application condition to adjust the stress distribution, optimization the face deformation, and avoid the stress concentration. All of the above has done to get the normal, stable and reliable operation of mechanical seal. Research shows that zero leakage under alternate change of internal and external pressures can be realized through reasonable model selection, setting of sealing parameters and details optimization.