摘要
离心式压缩机是离心式冷水机组的核心设备,气悬浮离心式制冷压缩机具有高速,无油,成本低等优点,是离心式压缩机的重要发展方向之一。气悬浮离心式制冷压缩机高速、紧凑的结构使其散热环境更加恶劣,需要更有效的冷却方式。建立了压缩机电机数学模型,数值模拟了不同进出口条件下制冷剂流场与电机温度场的分布。结果表明:绕组中心位置温度最高,靠近电机腔出口侧的端部冷却效果好于空腔侧,顺时针45°-180°方向冷却效果最好;增大入口压力会增强冷却效果,入口压力每增大93kPa,绕组温度下降2℃左右;入口干度在0-0.6之间冷却效果变化较小,入口干度大于0.6时冷却效果明显下降;增大回气压力会降低冷却效果,回气压力每增大40kPa时绕组温度升高3℃-4℃。通过研究压缩机电机轴向和周向的冷却差异,及不同进出口条件下压缩机电机的冷却情况,为不同工况下气悬浮离心式制冷压缩机电机冷却方案提供了思路。
Centrifugal compressor is the core equipment of centrifugal chiller. Centrifugal refrigeration compressor with gas bearing has the advantages of high speed, oil-free and low cost. It is one of the important development directions of centrifugal compressor. The high speed and compact structure of centrifugal refrigeration compressor with gas bearing makes its heat dissipation environment worse, and requires more effective cooling methods. The mathematical model of compressor motor is established, and the distribution of refrigerant flow field and motor temperature field under different inlet and outlet conditions are numerically simulated. The results show that the temperature in the center of the winding is the highest, the cooling effect of the winding end near the outlet of the motor cavity is better than that of the winding end on the other side, and the cooling effect is the best in the direction of 45°-180°clockwise with the outlet as the reference point in the circumferential direction;Increasing the inlet pressure will enhance the cooling effect. For every 93 k Pa increase in the inlet pressure, the winding temperature will drop by about 2℃;When the inlet dryness fraction is between 0 and 0.6, the cooling effect changes little. When the inlet dryness fraction is greater than 0.6, the cooling effect decreases significantly;Increasing the returning pressure will reduce the cooling effect, and the winding temperature will increase by 3-4℃ when the returning pressure increases by 40 k Pa. By studying the axial and circumferential cooling difference of compressor motor and the cooling situation of compressor motor under different import and export conditions, an idea is provided for the cooling scheme of motor for centrifugal refrigeration compressor with gas bearing under different working conditions.
作者
刘义腾
刘广彬
高一鸣
裴瑾泽
Liu Yiteng;Liu Guangbin;Gao Yiming;Pei Jinze(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao,266061)
出处
《制冷与空调（四川）》
2022年第6期876-881,共6页
Refrigeration and Air Conditioning
基金
国家自然科学基金项目(52176010)。
关键词
气悬浮
制冷压缩机
数值模拟
电机冷却
Gas bearing
Refrigeration compressor
Numerical simulation
Motor cooling
