Single-screw compressor has attracted attentions from the scientific community due to its excellent performance. However, thermal deformations of the star wheel, screw, and casing substantially affect the clearance between the components, and hence reduce the performance of the single-screw compressor. In this study, the thermal deformation of a meshing pair of the single-screw compressor was investigated using a finite-element-based thermo-mechanical coupled model. This model was developed based on measured thermal boundary conditions during compressor operation. The effect of thermal deformation on the compressor sealing clearance was then studied. The results showed that the thermal deformation of the casing, screw, screw shaft, and star wheel significantly affected the clearance between the tooth tip and the groove bottom as well as the meshing pair clearance distribution. The change of clearance between the casing and screw is up to 0.03 mm while the change of the clearance between the star wheel tooth tip and screw groove is up to 0.05 mm. Furthermore, it was found that the spatial position meshing error caused by the thermal deformation was one of the major reasons for the wear of the meshing pair of the single-screw compressor. The simulated thermal deformation results agreed well with the experimental data. The clearances of the compressor were modified based on the thermal deformation in a single-screw compressor with a capacity of 6 m³/min and the results showed that the modified compressor can operate reliably. This indicated that the developed model could be used in the design of the single-screw compressor. It provides guidance for the design and optimization of large single-screw compressors.

单螺杆压缩机以其优异的性能受到科学界的关注。然而，星轮、螺杆和机壳的热变形会显着影响部件之间的间隙，从而降低单螺杆压缩机的性能。在这项研究中，使用基于有限元的热机械耦合模型研究了单螺杆压缩机啮合副的热变形。该模型是根据压缩机运行期间测得的热边界条件开发的。然后研究了热变形对压缩机密封间隙的影响。结果表明，套管、螺杆、螺杆轴的热变形、和星轮显着影响齿尖与槽底的间隙以及啮合副间隙分布。机壳与丝杠间隙变化可达0.03mm，星轮齿尖与丝杠槽间隙变化可达0.05mm。进一步研究发现，热变形引起的空间位置啮合误差是造成单螺杆压缩机啮合副磨损的主要原因之一。模拟热变形结果与实验数据吻合较好。根据容量为 6 m 的单螺杆压缩机的热变形修改了压缩机的间隙 03 mm，而星轮齿尖与丝杠槽间隙变化可达0.05 mm。进一步研究发现，热变形引起的空间位置啮合误差是造成单螺杆压缩机啮合副磨损的主要原因之一。模拟热变形结果与实验数据吻合较好。根据容量为 6 m 的单螺杆压缩机的热变形修改了压缩机的间隙 03 mm，而星轮齿尖与丝杠槽间隙变化可达0.05 mm。进一步研究发现，热变形引起的空间位置啮合误差是造成单螺杆压缩机啮合副磨损的主要原因之一。模拟热变形结果与实验数据吻合较好。根据容量为 6 m 的单螺杆压缩机的热变形修改了压缩机的间隙³ /min，结果表明改进后的压缩机运行可靠。这表明开发的模型可用于单螺杆压缩机的设计。它为大型单螺杆压缩机的设计和优化提供指导。