摘要
现有电动涡旋压缩机的动涡盘沿主轴轴线方向受到轴向气体力和轴向平衡力作用,而轴向平衡力由于电动涡旋压缩机经常在变转速工况条件下运行而频繁变化,导致动涡旋盘轴向受力的不稳定性,进而影响压缩机性能。针对这一问题,利用FLUENT滑移网格技术,模拟了平衡块在不同转速下对背压腔内润滑油搅动的瞬态过程,得到了润滑油的速度云图和流线图,并发现平衡块搅动会引起轴向平衡力周期性波动,且随转速的增大,轴向平衡力幅度增大,而平均轴向平衡力减小。最后结合轴向平衡力与轴向气体力随主轴转角的变化规律,提出了变相位协调叠加轴向力的优化设计方法,计算发现该方法可使轴向平衡力振幅减小,动涡盘运行更加平稳,可为电动涡旋压缩机设计提供依据。
The orbiting scroll of the existing electric scroll compressor is subjected to axial gas force and axial balance force in the direction of the spindle axis,and the axial balance force frequently changes due to the operation of the electric scroll compressor often under variable speed conditions,resulting in instability of the axial stress of the orbiting scroll,which further influences the compressor performance.For this problem,the transient process of lubricating oil stirring in the back pressure chamber of the balance weight at different speeds was simulated using FLUENT sliding grid technology,and the speed cloud and streamline diagram of the lubricating oil were obtained,and it was found that the stirring of the balance weight would cause periodical fluctuation of the axial balance force,and as the rotational speed increases,the axial balance force increases and the average axial balance force decreases.Finally,in combination with the variation law of axial balance force and axial gas force with the rotation angle of the main shaft,the optimization design method of coordinated superposition of variable phase and axial force was proposed.It was found that the method can reduce the amplitude of the axial balance force and make the orbiting scroll run more smoothly,which can provide a basis for the design of the electric scroll compressor.
作者
刘兴旺
万春焕
康小兵
Liu Xingwang;Wan Chunhuan;Kang Xiaobing(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《流体机械》
CSCD
北大核心
2019年第11期19-25,共7页
Fluid Machinery
关键词
电动涡旋压缩机
动涡盘
平衡块
轴向平衡力
优化
electric scroll compressor
rotary scroll member
balance weight
axial balance force
optimization
