凸舌油槽对摆线转子泵空化特性的影响  

Influence of Tongue Oil Groove on Cavitation Characteristics of Cycloid Gerotor Pump

作　　者：郑水华[1] 牟成琪 谷云庆[1] 牟介刚[1] 任芸[2] 陈真富 ZHENG Shuihua;MOU Chengqi;GU Yunqing;MOU Jiegang;REN Yun;CHEN Zhenfu(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Zhijiang College,Zhejiang University of Technology,Shaoxing 312030,China)

机构地区：[1]浙江工业大学机械工程学院,杭州310014 [2]浙江工业大学之江学院,绍兴312030

出　　处：《农业机械学报》2019年第3期412-419,426,共9页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51779226;51606167);浙江省自然科学基金项目(LY19E050003)

摘　　要：为了改善摆线转子泵的空化特性,提出一种增加极限进出油面积的凸舌油槽结构方案,建立摆线转子泵凸舌油槽结构模型,采用RNG k-ε湍流模型对不同工况下摆线转子泵的内部空化流动进行仿真模拟,分析摆线转子泵凸舌油槽结构在不同转速、不同转子位置时的空化特性,并对不同监测点的含气率及轴向含气率不均匀度进行分析,同时对不同旋转速度及不同进口压力条件下摆线转子泵的空化特性进行试验及对比分析。结果表明:凸舌油槽结构在3种转速下对空化均有所缓解,改善的空化位置主要位于靠近最大啮合容积处;高转速时凸舌油槽结构对转子区域内含气率改善最为明显,低转速下凸舌油槽结构对空化改善效果较小;空化沿轴向具有不均匀性,在进油侧最小齿间容积处、转子底部空化严重,而在较大的齿间容积处、转子中上部的空化更为严重。摆线转子泵的容积效率模拟值与试验值较为吻合,且变化趋势一致,不同进口压力下凸舌油槽的容积效率均高于原模型,凸舌油槽的空化特性优于原模型。In order to improve the cavitation characteristics of cycloidal gerotor pump,a convex tongue oil groove structure was put forward with an increasing limit of oil flow,and the structure model of cycloidal gerotor pump convex tongue was established.The RNG k-εturbulence model was used to simulate the internal cavitation flow of cycloidal gerotor pump under different working conditions,the cavitation characteristics of cycloidal gerotor pump convex tongue oil groove were analyzed at different speeds and rotor positions,and the gas rate and axial gas bearing rate of different monitoring points were further studied.And the cavitation characteristics of the cycloidal gerotor pump at different rotation speeds and different inlet pressure conditions were tested and compared.The results showed that the structure of the convex tongue can reduce the cavitation at three kinds of rotational speed,the improved cavitation position was mainly located near the maximum inter-tooth volume;the convexity groove had the most obvious improvement in the air rate of the rotor region at high speed,less effective at low speed;the cavitation along the axial direction had an inhomogeneity,the bottom cavitation was more serious in the minimum inter-tooth volume of the inlet side,and the cavitation in the upper part of the rotor was more serious in the larger tooth space.The volumetric efficiency simulation value of the cycloidal rotor pump was in good agreement with the experimental value.The volumetric efficiency of the tongue oil groove was higher than that of the original model under different inlet pressures,and the cavitation characteristics of the tongue oil groove were better than that of the original model.

关 键 词：摆线转子泵 凸舌油槽模型 空化 含气率 不均匀度 

分 类 号：TH326[机械工程—机械制造及自动化]