主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2021, Vol. 40 ›› Issue (5): 775-777.

• • 上一篇    

重型汽车空调散热器烧毁原因分析与验证

吴冰冰1.2，邓番林1，曾志卫1，王君兆1.2   

  1. 1. 深圳市美信咨询有限公司，广东深圳518108；2. 深圳市美信检测技术股份有限公司，广东深圳518108
  • 出版日期:2021-05-15 发布日期:2021-05-15
  • 作者简介:吴冰冰（1988-），男，深圳市美信咨询有限公司失效分析工程师，主要从事机械产品失效分析以及金属材料性能表征的研究工作，广东省深圳市宝安区石岩街道松白公路北侧北大科创园A5 栋一楼，518108。

Analysis and verification of the causes of the burning of truck air conditioner radiator

WU Bing-bing1,2, DENG Fan-lin1, ZENG Zhi-wei1, WANG Jun-zhao1,2   

  1. 1. Meixin Consulting Co.，Ltd., Guangdong Shenzhen 518108, China; 2. Meixin Testing Technology Co.，Ltd., Guangdong Shenzhen 518108, China
  • Online:2021-05-15 Published:2021-05-15

摘要： 通过对重型汽车空调散热器风扇电机烧毁事故应用宏观、微观、金相等测试方法进行原因分析，找出其烧毁的根本原因。利用模拟验证分析烧毁原因，并复现烧毁过程。结果表明，引起电机铜线瞬时一次熔断的根本原因为铜线表面存在裂纹，电机高速运转时裂纹疲劳扩展导致铜线截面积减小，启动时瞬间电流过大引起铜线高温熔断。铜线瞬时一次熔断后，熔断一端在停机后卡在电机转子与定子之间，再次启动时，由于启动扭矩过低使电机无法转动而过负荷，最终烧毁。

关键词: 电机, 一次熔断, 火灾调查

Abstract: This report analyzed the cause of the fan motor burnout through macroscopic, microscopic, and metallographic test methods to find out the root cause. The simulation verification was used to analyze the cause of burnout and replicate the burnout process. The results showed that the root cause of the primary short circuited of the copper wire was the existence of cracks on the surface of the copper wire. When the motor was running at high speed, the fatigue propagation of the crack caused the wire cross- sectional area to decrease. Excessive instantaneous current during startup caused high temperature fusing of the copper wire. After the copper wires fused, the fuse end was stuck between the rotor and the stator of the motor after stopping. When restarting, the motor could not rotate due to the low starting torque and was overloaded and eventually burned.

Key words: motor, primary fuse, fire investigation