涡旋压缩机滑环式防自转机构的摩擦磨损研究
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摘要
十字滑环的摩擦磨损对涡旋压缩机动静涡旋盘的精确啮合和整机的高效运行均有很大影响,为探究十字滑环的摩擦磨损特性,根据动涡旋盘和十字滑环所受力的平衡方程,推导出十字滑环凸键处所受正压力的计算方法,代入样机数据计算得到了十字滑环所受摩擦力的变化规律。利用有限元软件模拟了做变速往复运动的十字滑环的摩擦接触,分析了十字滑环的实时接触状态和摩擦力分布情况,并计算出十字滑环的摩擦损失功率。结果表明:十字滑环在动涡旋盘滑槽处受到的摩擦力随主轴转角按类似正、余弦函数规律变化,十字滑环在机架滑槽处受到的摩擦力在一个运动周期内基本不变;十字滑环与动涡旋盘接触的凸键处受力随主轴转角变化而有规律地发生改变,不断对十字滑环凸键键端处造成冲击,这是致使十字滑环容易磨损的主要原因;十字滑环摩擦应力变化显著处是十字滑环与动涡旋盘接触的凸键部位,凸键部位的键端处是十字滑环最易磨损的部位;十字滑环摩擦损失功率约为20~90W,占整机摩擦损失功率的比例约10%。
The cross slip ring's friction and wear has a great influence on both scroll plate's precise meshing and scroll compressor's efficient operation. In order to explore wear and friction loss of the cross slip ring,having force-balance equation for the orbiting scroll and cross slip ring based to work out a calculation method for positive pressure at the cross slip ring's convex key was implemented,including having prototype data based to get friction's periodic variation of the cross slip ring. Through making use of the finite element software to analyze friction contact of the cross slip ring in reciprocating motion,and its real time contact status and the friction force distribution,the cross slip ring's friction loss power was obtained. The results show that,at the orbiting scroll,the friction force of the cross slip ring changes with the principle axis which varies like the sine and the cosine function,and the end of cross slip ring's convex key is impacted continuously,this mainly incurs the wear of the cross slip ring; and at the rack's sliding chute,the friction force of cross slip ring keeps steady in a period of motion; and the end of convex key of cross slip ring area that contacting with orbiting scroll is easy to be worn; the cross slip ring's frictional loss stays at 20 to 90 W which accounting for about 10% of the total friction loss.
The cross slip ring's friction and wear has a great influence on both scroll plate's precise meshing and scroll compressor's efficient operation. In order to explore wear and friction loss of the cross slip ring,having force-balance equation for the orbiting scroll and cross slip ring based to work out a calculation method for positive pressure at the cross slip ring's convex key was implemented,including having prototype data based to get friction's periodic variation of the cross slip ring. Through making use of the finite element software to analyze friction contact of the cross slip ring in reciprocating motion,and its real time contact status and the friction force distribution,the cross slip ring's friction loss power was obtained. The results show that,at the orbiting scroll,the friction force of the cross slip ring changes with the principle axis which varies like the sine and the cosine function,and the end of cross slip ring's convex key is impacted continuously,this mainly incurs the wear of the cross slip ring; and at the rack's sliding chute,the friction force of cross slip ring keeps steady in a period of motion; and the end of convex key of cross slip ring area that contacting with orbiting scroll is easy to be worn; the cross slip ring's frictional loss stays at 20 to 90 W which accounting for about 10% of the total friction loss.
引文
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[3]李超,孙照岚,赵嫚.无油润滑涡旋压缩机动静涡旋端面摩擦测试装置[J].化工机械,2014,41(2):180~183.
[4]曹霞,陈芝久,刘振全.立式高压型涡旋压缩机摩擦副分析[J].上海交通大学学报,2000,34(9):1228~1232.
[5]刘兴旺,刘振全,李超,等.涡旋压缩机摩擦损耗和泄漏损耗研究[J].压缩机技术,2006,(3):1~4.
[6]王国梁,高秀峰,冯诗愚,等.涡旋压缩机防自转机构载荷改善分析[J].流体机械,2000,28(8):39~41.
[7]胡旭,屈宗长,于漠南,等.平动回转式压缩机的几何理论[J].中国机械工程,2011,22(16):1896~1900.
[8]李超,郑尚书,赵嫚,等.涡旋压缩机小曲拐防自传机构动力特性分析[J].中国机械工程,2014,25(2):236~241.
[9]温诗铸,黄平.摩擦学原理[M].北京:清华大学出版社,2002.
[10]余洋.涡旋压缩机动力特性及仿真模拟研究[D].兰州:兰州理工大学,2014.
[11]刘佐民.摩擦学理论与设计[M].武汉:武汉理工大学出版社,2009.