部分负荷下螺杆压缩机电机内流动与换热研究  

Flow and Heat Transfer Analysis of the Motor in Screw Compressor

作　　者：陈文卿[1] 沈九兵[1] 吴华根[1] 邢子文[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《制冷技术》2012年第1期4-8,23,共6页Chinese Journal of Refrigeration Technology

摘　　要：制冷用耐氟利昂三相异步电动机广泛应用于半封闭螺杆制冷压缩机中,由压缩机吸气冷却电机。为研究冷媒对电机的冷却效果,考察冷媒流经电机后的温升及压力损失对压缩机性能的影响,确保电机安全可靠地长期运行,基于流体网络和等效热路理论建立了部分负荷下半封闭螺杆制冷压缩机用电机内流动与换热数学模型,并对其进行了试验验证,分析了不同负荷下定子绕组温度分布,冷媒温升和压降,以及压缩机功耗和容积效率等宏观性能参数的的变化趋势。研究表明,定子绕组温度和冷媒流经电机后的过热度随负荷下降而快速上升,不可逆损失增加,为保证电机绝缘可靠性和效率,应避免压缩机在过低负荷下长时间运行。Freon-resistant three phase asynchronous induction motor is widely used in semi-hermetic twin screw refrigeration compressor,and the motor is cooled by compressor suction refrigerant.To research cooling effects of the motor and influences of refrigerant temperature rise and pressure drop through the motor on performance of the compressor package,ensure reliable continuous operation,a mathematical model describing flow and heat transfer characteristics of the motor in semi-hermetic twin screw refrigeration compressor under part-load conditions is built based on fluid network and thermal equivalent circuit theories.Experimental research is implemented and the model is verified to be reasonable for temperature and pressure distribution evaluation inside the motor and investigation of their influences on performance of the compressor package,such as power consumption and volumetric efficiency,under part-load conditions.It can be concluded that stator winding temperatures and refrigerant superheat degree through the motor rise as the compressor loads off,irreversible losses increase although power consumption decreases.To keep the motor insulating reliability and efficiency,the compressor should be avoided to operate under too low load positions for long time.

关 键 词：部分负荷 半封闭螺杆制冷压缩机 电机 流动 换热 

分 类 号：TB652[一般工业技术—制冷工程]