中高压外啮合齿轮泵端面间隙的理论计算  

Theoretical calculation of axial clearance in medium or high pressure external gear pumps

作　　者：李玉龙[1] 孙付春[1] 

机构地区：[1]成都大学工业制造学院,四川成都610106

出　　处：《排灌机械工程学报》2012年第2期147-152,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：安徽省自然科学基金资助项目(2004KJ317);成都大学人才引进基金资助项目(20804)

摘　　要：在浮动轴套(侧板)受力分析的基础上,通过其内侧油膜挤压力、困油力、工作油压力和其外侧补偿力等的计算,构建出浮动轴套(侧板)轴向的动力学模型.利用龙格-库塔法在一个啮合周期内的迭代运算,获得端面间隙的动态仿真结果,并就压紧力系数、工作油压的不同分布和困油压力对端面间隙的影响进行分析.结果表明:案例工况参数下的端面间隙值一般在0.13 mm左右,与实际情况比较吻合;同一压紧系数下浮动侧板内侧因工作油压的不同分布所引起的总油压力越大,端面间隙则越小;在其他条件不变的情况下,压紧系数越大,端面间隙越小;油压的不同分布、压紧系数的大小对端面间隙具有明显的影响,而困油压力的影响较小;总体而言,中、高压外啮合齿轮泵的端面间隙实际上波动较小,可采用动态端面间隙的均值以简化后续计算.The study on theoretically estimating variable axial clearance in a medium or high pressure external gear pump is rare yet, thus a dynamics model for determining such a clearance was established in the paper based on an analysis on forced acted on a floating axial sleeve （ side plate）, which consisted of the pressure in squeezed film, the outside compensated forces on the sleeve, the pressure in trapped oil and the working oil pressure. Then variable axial clearances were iteratively estimated from the model in a meshing cycle by using the Runge - Kutta method. Subsequently, an analysis on the influence of compression ratio, different distributions of working oil pressure and trapped oil pressure on the clearance value was conducted. The results show that the axial clearance is about 0.13 mm in all the cases, and it is consistent with the actual value. The greater the total force of oil pressure due to the different distributions of operating oil pressure at the same compression ratio, the smaller the axial clearance. As the other conditions remain unchanged, the higher the compression ratio, the smaller the axial clearance. Moreover the operating oil pressure and compression ratio have a significant impact on the clearance, but the trapped oil pressure just has slight effect on it. Generally, in a medium or high pressure external gear pump the axial clearance really shows less variable, so that the mean value of the variable clearances can be applied in design to simplify subsequent calculations.

关 键 词：齿轮泵 端面间隙 浮动轴套 轴向振动 困油压力 

分 类 号：S277.9[农业科学—农业水土工程] TH325[农业科学—农业工程]