Mechanical analysis of key components and machine performance for the oil regeneration project compressor
Special scroll profiles among the functional general scroll profiles were chosen to make a study on the integrative performance of the scroll compressor. Based on such profiles, it was further researched for all factors working on the integrative performance of the scroll compressor and the analysis of gas power was made on the key components influencing the integrative performance and four basic parameters including height, spindle rotation, involute angle and radius parameter of base circle. It was analyzed that the relation of axial gas power, radial gas power tangential gas power, overturning torque and rotation torque of dynamic and static vortex plate by employing the Genetic Algorithms (GA) of MATLAB to obtain the restricted parameter range, and to conclude that there is a linear relationship among four basic parameters and the overall force. Instance calculation was conducted to prove the validity of the restricted range that compression ratio and volume utilization have been increased greatly after optimization, so as to avoid the blindness of parameter selection and consequently improve the integrative performance of the scroll compressor.
Numerical analysis on the effects of refrigerant injection on the scroll compressor
Abstract Refrigerant injection is an effective method to improve the performance of the scroll compressor and its system under high compression ratio working conditions. This paper intends to find the exhaustive relationship between the injection parameters and the compressor’s performance. Based on a thermodynamic model, the effects of various parameters of refrigerant injection on general performance and inner compression process of scroll compressor have been investigated. As a result, it is found that the injected scroll compressor will get the maximum indicated efficiency when the ratio of inner compression ratio and outer compression ratio is a right value. The right value is 1 for the isentropic compression process, and smaller than 1 for a real compression process. Finally, the effects of all the injection factors on the compression work, refrigerant mass flow rate, p–h diagram, volumetric efficiency, and indicated efficiency are investigated detailedly.
Numerical research on the scroll compressor with refrigeration injection
Abstract A general model for a scroll compressor with refrigerant injection is established in this paper. The model can be used to predict the macro performance and inner compression process of the injected scroll compressor. A series of experiments are conducted to validate the accuracy of the model. The results show that the model can precisely predict not only the general performance of the compressor but also the inner compression with or without refrigerant injection. Based on the thermodynamic model and the test bench, the injection process of the scroll compressor has been investigated and the thermodynamic essence is revealed. It is found that the refrigerant injection process can be considered as a continual parameter-varying “adiabatic throttling + isobaric mixture” time-varying process.