Abstract: ２D axisymmetric model of seal structure in compressor for air source heat pump heat unit was established by using nonlinearity finite element theory of large deformation and contact problem．Some typical parameters of the seal structure
which might have the impact on the sealing performance ，such as gap^,s dimension between flanges，chamfer radius of the groove，groove depth and groove width， were analyzed． It is show that the gap between flanges influences the maximum contact pressure and shear stress are very much，groove depth and groove width have a remarkable influence on the maximum
contact pressure and chamfer radius of the groove has a little impact on shear stress.

Key words: O－ ring , Contact problem , Seal performance , Non－linear FEM , Heat pump heat unit

摘要： 利用大变形、接触的非线性有限元理论建立了空气源热泵热水机组压缩机密封结构的二维轴对称模型，据此对影响密封性能的各结构参数进行了分析，讨论了上下法兰张开间隙、密封槽槽口倒角半径、密封槽深、密封槽宽等典型参数的影响。结果表明，上下法兰张开间隙对最大接触压应力和剪应力的影响较大，而密封槽槽口处倒角半径对剪切应力影响不大，密封槽深、密封沟槽宽度对密封面最大接触压力的影响较显著。

关键词: O 形密封圈 , 接触问题 , 密封性能 , 非线性有限元 , 热泵热水机组