平衡式双定子泵的理论分析与实验研究

发布时间：2018-05-24 13:08

本文选题：平衡式双定子泵 + 密封容积　；参考：《燕山大学》2015年硕士论文

【摘要】：液压泵是将机械能转换为液压能的装置,是液压系统的心脏。目前广泛应用的叶片泵均由一个转子对应一个定子组成一个泵,双联泵亦是如此,这限制了叶片泵功率质量比进一步提升的空间。双定子结构通过将独立的叶片泵径向布置,使两泵共用一个转子与一根泵轴,打破了转子与定子的一一对应关系,使大幅提高叶片泵的功率质量比成为可能。然而,由于同时受内、外泵中高压油液的双重影响,作用于转子上的轴向与径向不平衡液压力对双定子泵的影响十分严重。由此,本课题研究了平衡式双定子泵方案。首先,提出了本课题研究的背景与意义,指出了双定子泵与双联泵的区别,介绍了目前国内外容积式液压泵特别是容积式叶片泵的创新与发展趋势和本课题的主要研究内容及面临的难点。其次,阐述了平衡式双定子泵的工作过程与连接方式,针对双定子泵特有的密封容积形成过程,对叶片结构进行了受力分析。研究了不同工况下平衡式双定子泵赖以工作的密封容积的形成机理。对平衡式双定子泵进行了结构设计,通过分别将双定子泵内、外泵中的吸压油窗口对称设计并连接在一起的方法,使转子径向受力处于动态平衡之中;采用液压压力平衡的方法,将转子轴向受力减至最小。推出了转子径向受力的表达式,同时校核了叶片结构。再次,对平衡式双定子泵的输出特性进行了研究,推出了该泵在三种不同工况下的排量、瞬时流量公式,探讨了多作用双定子泵中由于流量叠加而对泵输出特性的影响。在对该泵输出特性分析的基础上,得出了泵输出脉动最小时的进出油口位置。考虑了滞后角对平衡式双定子泵整体输出特性的影响。同时,还分析了该泵的内泄途径及不同内泄途径的泄漏量,得到了不同工况下该泵的泄漏量表达式。最后,搭建了平衡式双定子泵实验平台,进行了原理性实验,验证了平衡式双定子泵的可行性。为以后平衡式双定子泵的优化奠定了基础。
[Abstract]:Hydraulic pump is a device that converts mechanical energy to hydraulic energy and is the heart of hydraulic system. At present, vane pumps are widely used to form a pump with a rotor corresponding to a stator, as is the case with a dual pump, which limits the room for further improvement of the power and mass ratio of the vane pump. Through the radial arrangement of the independent vane pump, the dual stator structure makes the two pumps share a rotor and a pump shaft, which breaks the one-to-one relationship between the rotor and the stator, and makes it possible to greatly improve the power mass ratio of the vane pump. However, due to the double influence of high pressure oil in the internal and external pumps, the axial and radial unbalanced hydraulic forces acting on the rotor have a very serious effect on the double-stator pump. Therefore, the balanced double stator pump scheme is studied in this paper. First of all, the background and significance of this research are put forward, and the difference between double stator pump and dual pump is pointed out. This paper introduces the innovation and development trend of the displacement hydraulic pump at home and abroad, especially the displacement vane pump, and the main research contents and difficulties in this subject. Secondly, the working process and connection mode of the balanced double stator pump are expounded, and the blade structure is analyzed according to the forming process of the sealing volume of the double stator pump. The forming mechanism of sealing volume of balanced double stator pump under different working conditions is studied. The structural design of the balanced double-stator pump is carried out. Through the symmetrical design and connection of the suction window in the double-stator pump and the external pump, the radial force of the rotor is in dynamic balance. The axial force of the rotor is minimized by hydraulic pressure balance. The expression of radial force on rotor is derived, and the blade structure is checked at the same time. Thirdly, the output characteristics of the balanced double-stator pump are studied, the displacement and instantaneous flow formulas of the pump under three different working conditions are deduced, and the effect of the multi-action double-stator pump on the pump output characteristics due to the superposition of the flow rate is discussed. Based on the analysis of the pump output characteristics, the position of the inlet and outlet when the pump output pulsation is minimum is obtained. The effect of lag angle on the output characteristics of balanced double stator pump is considered. At the same time, the leakage amount of the pump and the leakage of different internal discharge ways are analyzed, and the expression of the leakage rate of the pump under different working conditions is obtained. Finally, the experimental platform of balanced double stator pump is built, and the principle experiment is carried out to verify the feasibility of the balanced double stator pump. It lays a foundation for the optimization of the balanced double stator pump in the future.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH137.51

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