摘要
设计了一种叶片可缩回式叶片泵。通过子母式叶片泵与插装式液控换向阀的组合,实现叶片泵供油和卸荷两种状态的切换,同时换向阀的阻尼作用为高压区叶片的伸出提供条件。建立单侧轴向间隙泄漏模型,计算泄漏功率损失及油膜剪切功率损失,建立总功率损失与轴向间隙的关系方程式,求得最佳轴向间隙。提出的该型叶片泵卸荷状态下叶片缩回的条件,并基于热楔油膜理论验算了油膜剪切所造成的温升,以及该温升下油膜膨胀对叶片的作用力,验算叶片泵卸荷时叶片缩回条件,得出叶片可缩回的结论。
In this paper,the design of a blade retractable vane pump was demonstrated. The combination of a vane pump with a plug-in type pilot-operated directional control valve can achieve the shift between the two states of oil supply and unloading of the vane pump. In addition,the damping effect of the directional valve makes it possible for the extension of the vane even in the high pressure portion. The axial clearance model was established to calculate the leakage power loss and the shear loss of the oil film. The relationship between the total power loss and the axial clearance was set up to obtain the optimal axial clearance.Furthermore,the condition of blade retraction under unloaded state was concluded and the temperature increase caused by oil film shear was calculated based on the theory of hot wedge oil film. Force exerted on the blade due to oil film expansion under the increased temperature was also verified. The conclusion of blade retraction condition during unloading of the vane pump enables the potential for future applications and further researches.
引文
[1]李壮云.液压元件与系统[M].北京:机械工业出版社,2011:47.LI ZhuangYun.Hydraulic components and systems[M].Beijing:Mechanical Industry Press,2011:47(In Chinese).
[2]张海平.国外液压研发动态介绍[J].液压气动与密封,2012(01):9-15.ZHANG Hai Ping.Introduction of hydraulic research and development in foreign countries[J].Hydraulics Pneumatics and Seals,2012(01):9-15(In Chinese).
[3]张萍.液压泵闸流变量研究[J].液压与气动,2001(11):3-5.ZHANG Ping.Hydraulic and pneumatic hydraulic variable pump of[J].Thyristor,2001(11):3-5(In Chinese).
[4]郑澈.变量双作用叶片泵研究[J].液压与气动,2002(06):35-37.ZHENG Chen.Research on variable double acting vane pump[J].Hydraulics and Pneumatics,2002(06):35-37(In Chinese).
[5]马金河,胡凯,王新彪.高压节能叶片泵的研制[J].液压与气动,2014(2):114-116.MA JinHe,HU Kai,WANG XinBiao.Development of high pressure energy saving vane pump[J].Hydraulics and Pneumatics,2014(2):114-116(In Chinese).
[6]那焱青,王峥嵘,李少年,等.高压子母叶片泵流量均匀性[J].机械工程学报,2007(10):234-238.NA Yan Qing,Wang ZhengRong,LI ShaoNian,et al.High pressure vane pump flow uniformity of[J].Journal of Mechanical Engineering,2007(10):234-238(In Chinese).
[7]那焱青,李少年,王峥嵘,等.关于子母叶片泵叶片的受力分析[J].兰州理工大学学报,2004(04):61-63.NA YanQing,LI ShaoNian,WANG ZhengRong,et al.Stress on the blade vane pump analysis[J].Journal of Lanzhou University of Technology,2004(04):61-63(In Chinese).
[8]张海竹,卢勇,张薇,等.高压叶片泵流体泄漏研究[J].流体机械,2009(03):1-5.ZHANG Hai Zhu,LU Yong,ZHANG Wei,et al.High pressure vane pump fluid leakage of[J].Fluid Machinery,2009,(03):1-5(In Chinese).
[9]许耀铭.油膜理论与液压泵和马达的摩擦副设计[M].北京:机械工业出版社,1987:81-86.XU Yao Ming.Theory of oil film and friction pair design of hydraulic pump and motor[M].Beijing:Mechanical Industry Press,1987:81-86(In Chinese).
[10]袁春英,杨沛然,等.平行间隙的热楔承载机理分析[J].摩擦学学报,2010(04):392-398.YUAN ChunYing,YANG PeiRan,et al.Analysis of the mechanism of heat transfer between parallel gaps[J].Tribology,2010(04):392-398(In Chinese).
[11]高创宽,周谋,亓秀梅.齿面摩擦力对齿轮接触应力的影响[J].机械强度,2003(06):642-645.GAO ChuangKuan,ZHOU Mou,QI Xiu Mei.Effect of friction of tooth surface contact stress of gears[J].Journal of Mechanical Strength,2003(06):642-645(In Chinese).