College of Mechanical Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China.
Sci Rep. 2022 Oct 3;12(1):16544. doi: 10.1038/s41598-022-20871-8.
The high resistance characteristic of the grease delivery process makes the centralized lubrication system easy to cause pipeline blockage during the grease supply process. The main objective of the present article is to design a non-spool relief valve device based on the round pipe. The plug shape characteristics of the grease flow in the tube are established by combining the hydrodynamic equation and the grease rheological model. The mathematical model, whose relationship between velocity and flow is derived, is established with the core pipe of the grease spool-less relief valve of flow resistance, so the factors affecting grease pipe flow are obtained. The numerical simulation method is used to simulate the lipid overflow process of the simplified model with different influence parameters. Tecplot 360 EX 2015 R1 is used as a post-processing software to derive velocity and pressure clouds for grease flow in a circular tube, to investigate the factors influencing the relief pressure and relief capacity of the relief valve, to derive general rules for grease relief pressure, grease relief capacity and grease flow pattern distribution, and to establish an evaluation model for the relief pressure and relief capacity of the relief valve. The performance research test platform of the grease spool-less relief valve is built, and NLGI1 lithium grease is selected to carry out the experimental study on the performance of the grease relief valve under different influence parameters. The safety, stability, and feasibility of the overflow valve working with the pumping system are verified.
油脂输送过程中的高阻力特性使得集中润滑系统在油脂供应过程中容易发生管道堵塞。本文的主要目的是设计一种基于圆管的无滑阀式减压阀装置。通过结合流体动力学方程和油脂流变学模型，建立了管内油脂流动的塞形状特征。建立了基于油脂无滑阀式减压阀核心管道的速度与流量关系的数学模型，从而得出影响油脂管道流动的因素。采用数值模拟方法，对不同影响参数的简化模型的脂质溢出过程进行模拟。使用 Tecplot 360 EX 2015 R1 作为后处理软件，得出了圆形管道中油脂流动的速度和压力云图，研究了影响减压阀 Relief 压力和 Relief 能力的因素，得出了减压阀 Relief 压力、油脂 Relief 能力和油脂流动模式分布的一般规律，并建立了减压阀 Relief 压力和 Relief 能力的评价模型。搭建了油脂无滑阀式减压阀的性能研究测试平台，选用 NLGI1 锂基脂，对不同影响参数下油脂减压阀的性能进行了实验研究。验证了溢流阀与泵送系统一起工作的安全性、稳定性和可行性。
