Study of the thermo-mechanical couple deformation of the meshing pairs of a single-screw compressor

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.

Statistical mechanical analysis of the electromechanical coupling in an electrically-responsive polymer chain

Polymers that couple deformation and electrostatics have potential application in soft sensors and actuators for robotics and biomedical technologies. This paper applies statistical mechanics to study their coupled electromechanical response.

Research on Thermal Analysis of Pillow Spindle System with Multi Axes Rotary Spindle Head

Based on the theory of finite-element method, a model of pillowed multiple axes rotary spindle head is built. Taking both temperature and structure load into account of the model, a calculation is made on thermal couple deformation under the combined action of the two kinds of load. A prediction on the rationality during system designing is put forward, which has gotten a wider use.