Comparative study of bearing loads for different twin screw compressor rotor configurations

10th International Conference on Compressors and their Systems

Buckney, D.^1 ; Anderson, C.^1

Howden Compressors, Glasgow, United Kingdom^1

关键词: Bearing loads;    Chamber model;    Comparative studies;    Length to diameter ratio;    Rotor profiles;    Rotor stiffness;    Screw compressors;    Specific loads;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/232/1/012025/pdf
DOI  :  10.1088/1757-899X/232/1/012025

来源: IOP

【 摘 要 】

Designing rotor geometry is a critical stage in the design of a twin screw compressor which has a significant impact on: capacity; leakage characteristics; thermodynamics; rotor stiffness; dynamics; and loading on the bearings. The focus of this paper is on bearing loads. In order to design screw compressors that can operate at higher pressures the bearings quickly become a limiting factor. With the need to house the bearings adjacent to one another on each of the parallel rotor shafts at a given centre distance there is an inherent limit to the bearing geometry envelope. In this investigation the 'rotor configuration' refers to the rotor lobe combination, length to diameter ratio (L/D), and wrap angle. The geometry of the transverse rotor profiles is kept constant, as far as possible, allowing conclusions to be drawn based on a manageable number of variables. A procedure to calculate bearing specific loads based on results from a thermodynamic chamber model is presented and results for a range of rotor configurations are discussed.