College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu, China.
School of Intelligent Manufacturing Engineering, Chongqing University of Arts and Sciences, Chongqing, China.
PLoS One. 2022 Jul 28;17(7):e0270979. doi: 10.1371/journal.pone.0270979. eCollection 2022.
As a medium and low pressure gear machine without automatic compensation structure for axial and radial clearances, the friction pairs in the straight conjugate internal gear pumps (SCIGPs) depend on the fixed small clearances to seal, lubricate and transfer the force. The oil film design of the friction pairs has become an important part of gear pump design. However, there has never been a publicly published research on the oil film design of the SCIGP in past literature. This paper applies orthogonal test to the oil film design of the SCIGP for the first time to determine the best working clearances. With this goal, the paper first provides the mathematical models for analyzing the internal leakage flow and the viscous friction loss, which elucidate the relationships between the leakage and the friction loss with working conditions. After that, the orthogonal test scheme for numerical simulation was designed on the basis of determining the range of oil film thickness. The paper also propounds the viewpoints of using the range-method to estimate the primary and secondary relationship of factors and determining the optimal combination according to the test target. Based on this concept, the main factors affecting the target are procured and the optimal working clearances of the friction pairs are determined. For the purpose of verifying the model, the redesigned prototype was tested and compared with the simulation results. The results validate the applicability of the simulation model and the correctness of the simulation method. Finally, the paper summarizes the ways to improve the total efficiency and the working conditions at the highest efficiency.
作为一种没有自动补偿轴向和径向间隙结构的中低压齿轮泵，直齿共轭内齿轮泵（SCIGP）中的摩擦副依靠固定的小间隙来实现密封、润滑和传递力。摩擦副的油膜设计已成为齿轮泵设计的重要组成部分。然而，在过去的文献中，从未有过关于 SCIGP 油膜设计的公开研究。本文首次将正交试验应用于 SCIGP 的油膜设计，以确定最佳工作间隙。为此，本文首先提供了用于分析内部泄漏流量和粘性摩擦损失的数学模型，阐明了工作条件下泄漏和摩擦损失之间的关系。之后，在确定油膜厚度范围的基础上，设计了数值模拟的正交试验方案。本文还提出了使用范围法估计因素的主次关系以及根据试验目标确定最佳组合的观点。基于这一概念，获取了影响目标的主要因素，并确定了摩擦副的最佳工作间隙。为了验证模型，对重新设计的原型进行了测试，并将结果与模拟结果进行了比较。结果验证了模拟模型的适用性和模拟方法的正确性。最后，本文总结了提高总效率和最高效率工作条件的方法。
