提高活塞式单机双级制冷压缩机K_e值及可靠性研究

The Research to Improve on the Keand Reliability of Single-Machine Double-Stage Reciprocating Refrigerating Compressors

目的研究提高活塞式单机双级制冷压缩机在低温工况下的单位功率制冷量Ke值.方法采用数值计算及试验的方法对制冷压缩机的性能进行分析研究,优化气阀结构,用有限元法进行结构强度设计.结果在工质为R717、缸径100 mm、缸数比2/6、行程100 mm、转速1 485 r/min、名义工况35℃/-40℃条件下,研制的新型单机双级制冷压缩机S810AC的Ke实测值达1.77 k W/k W,此类型单机双级制冷压缩机国际上单位功率制冷量Ke实测值仅达1.69 k W/k W.结论通过对比气阀运动规律的实验数据和模拟结果,显示出两者具有较高的吻合度,模型单机双级制冷压缩机能较真实地反映气阀实际运动规律,证明所建立的模型准确可靠.气阀运动规律的试验测定值可以用模拟计算代替,提出了压缩机部件的结构参数,压缩机的计算机辅助设计模型也能对压缩机的合理设计有一定的指导作用.

This paper aims at improving that the refrigeration capacity per unit power（ Ke ）of recip- rocating single-machine double-stage refrigerating compressor in the working condition of low tem- perature. Using numerical value calculation and experimentation to analyze and research the per- formance of the compressor and to optimize the valve structure ,finite element method（FEM）is a- dopted to devise structure strength. As a result, the Ke measured value of the new single-machine double-stage reciprocating refrigerating compressor S810AC can up to 1.77 kW/kW, under the condition which the refrigerant is R717, cylinder bore is 100mm, cylinder ratio is 2/6, stroke is 100 mm, rev is 1 485 r/min and nominal condition of ＋ 35 ℃/-40 ℃. International measured value of per power refrigerating capacity Ke of this kind single-machine double-stage reciprocating refriger- ating is only 1.69kW/kW. Through compared the experimental data with simulation results, it is indicated that both of them have high goodness of fit. The model single-machine double-stage re- ciprocating refrigerating compressor can truly reflect the gas valve locomotion rule. The model are prove to be reliable. Experimental value of movement law of the gas valve can be replaced with simulation calculation. The structural parameters of the compressor parts is proposed. The CAD （ computer aided design） calculating model has the guiding rule for the rational design of the com- pressor.