Structure Design And Dynamic Analysis Of A Triple Star-type Reciprocating Compressor

In order to improve the dynamic performance of W-type compressor, a new kinematically scheme of the triple star-type compressor is presented in this paper and its structure is designed. A new type of model is designed by the overall selection design, the thermodynamic calculation and the detailed structure design. Its working principle and the assembly drawing are introduced. The several key problems in the structure design such as interference between the kinematical parts, lubrication on the kinematical pairs, structure manufacturability and composability, are discussed. A major-minor connecting rods mechanism is applied in the main transmission system of the compressor and the crankshaft of the compressor is assigned to be vertical so as to splash lubrication can be used in the compressor. The dynamic performance of the designed compressor is better than the W-type compressor’s and its lubrication system is still simple just as the W-type compressor’s. The compressor’s structure is compact for its axial size is small.The main drive system of the triple star-type compressor is essentially composed of the major-minor linkage. In this paper, the main drive system of the triple star-type compressor and W-type compressor is studied in order to compare their dynamic performance. Their dynamic simulation models are established and solved in the same working condition by using ADAMS software. Their radial displacement of crankshaft journal center, and the trajectory of their crankshaft journal center are obtained. The calculation results show that:compared with the W-type compressor, the response amplitude of crankshaft journal center of the triple star-type compressor is reduced by 12.36%, the bearing counter force is reduced by 44.62%. The dynamic performance of the triple star-type compressor is better than the W-type compressor’s.In this paper, in order to study the problem of crankshaft counterweight optimization of the compressor, the mathematical model for the crankshaft counterweight optimization is established. Its objective function is the minimum response amplitude of crankshaft journal center, and the design variable is crankshaft counterweight. The optimal solution is obtained by using the ADAMS dynamics simulation software "optimization design" module. Optimization results show that the size of the crankshaft counterweight has a significant influence on the dynamic performance. The optimum target value of is lower 17.02%　than that of the original design point.The triple star-type compressor crankshaft counterweight is necessary to improve the dynamic performance.