挖掘机冷却系统热风回流分析与优化  

Analysis and optimization of hot air return in excavator cooling system

作　　者：冯涛 王飞 张孝天 邵国书 张乐涛 Feng Tao;Wang Fei;Zhang Xiaotian;Shao Guoshu;Zhang Letao(XCMG Excavation Machinery Co.,Ltd.)

机构地区：[1]徐州徐工挖掘机械有限公司

出　　处：《制冷与空调》2024年第9期22-28,79,共8页Refrigeration and Air-Conditioning

基　　金：国家重点研发计划(2020YFB1709900)。

摘　　要：针对某型挖掘机市场作业出现高温限扭问题,进行厂内热平衡试验研究。试验油耗百分比、扭矩百分比与市场高度相同,具备一致性、再现性。考虑隔热封板开裂引发热风回流所致,故试验方案设计为拆卸隔热封板、安装隔热封板和加装隔热棉。方案一水散、油散进气与环境的温差分别为8.8℃、9.7℃,大于限值5℃,吻合市场测试结果,经TRNSYS模拟验证,市场高温限扭问题定性为热风回流引起热平衡超标。而方案二、方案三虽有所改进,但热平衡仍未达标。采用更换7叶风扇以及增大机舱散热面积为0.32m^(2)进行热风回流优化,超标温度降至0.4℃、0.5℃,热平衡达标,风速、噪声也得到相应改善,从根本解决高温限扭问题。In view of the high temperature torque limiting problem of an excavator under market conditions,an in plant heat balance test was conducted.The test fuel consumption percentage and torque percentage are the same as those in the market,with consistency and reproducibility.Considering the problem of hot air backflow caused by the cracking of the heat insulation sealing plate,the test plan is designed to remove the heat insulation sealing plate,install the heat insulation sealing plate and add heat insulation cotton.In Scheme Ⅰ,the temperature difference between the inlet air of water dispersion and oil dispersion and the environment is 8.8℃ and 9.7℃ respectively,which is greater than the limit value of 5℃,which is consistent with the market test results.After TRNSYS simulation verification,the problem of high temperature torsion limit in the market is characterized as that the heat balance exceeds the standard due to hot air reflux.Although Scheme Ⅱ and Scheme Ⅲ have been improved,the heat balance is still not up to standard.The hot air return is optimized by replacing the 7-blade fan and increasing the cooling area of the engine room to 0.32 m^(2).The excessive temperature is reduced to 0.4℃ and 0.5℃,the heat balance is up to standard,and the wind speed and noise are also improved accordingly.The problem of high temperature torque limitation has been fundamentally solved.

关 键 词：高温限扭 热平衡 热风回流 试验 TRNSYS 

分 类 号：TU6[建筑科学—建筑技术科学]