空气侵入量对R32压缩机内可燃风险的影响

Influence of Air Intrusion in R32 Compressor on Combustible Risk

本文从R32压缩机内部安全运行的角度出发,在空调运行情况下,关闭冷凝器出口,采用实验和模拟研究相结合的方法,研究空气侵入过程中不同空气侵入量对R32压缩机内可燃风险的影响。研究结果表明:空气侵入量为压缩机吸气量的10%的情况对压缩机排气压力、排气温度的影响较小,可燃风险较低;空气侵入量大于压缩机吸气量的10%时,随着空气侵入量的增大,压缩机排气压力增大至超过额定压力的17%,增加了压缩机内的可燃风险;此时油池内润滑油温度超过100℃,生成积碳,增大了燃烧、爆炸风险;电机的线圈绕组温度超过绝缘材料的耐温极限120℃,加速绝缘材料的老化引发短路产生火花,增加压缩机内的可燃风险。

During the operation of the air conditioner,when the outlet of the air conditioner condenser is blocked,if there is a leak point in the front section of the compressor and the air is taken in,the mixture of R32 refrigerant and air will burn or explode when the temperature and pressure reach certain conditions.In this paper,in the view of the safe operation of the R32 compressor,when the air conditioner is running,close the condenser outlet.The combination of experimental and simulation studies is used to investigate the risk of flammability in the R32 compressor when the air intrusion is 10%,40%,or 60%of the compressor intake.The analysis results show that the air intrusion amount is 10%of the compressor suction,the impact on the compressor discharge pressure and exhaust temperature is small,and the flammability risk is low;When the amount of air intrusion is greater than 10%of the intake of the compressor,as the amount of air intrusion increases,the discharge pressure increases and when the air intrusion amount is 60%,the exhaust pressure exceeds 17%of the rated outlet pressure of the compressor.At this time,the temperature of the lubricating oil in the oil pool exceeds 100℃,generating the carbon deposit increases the risk of combustion and explosion;the coil winding temperature of the motor exceeds the temperature limit of the insulating material by 120℃,accelerating the aging of the insulating material to cause a short circuit to generate sparks,and increasing the flammability risk in the R32 compressor.