热管理系统多通电子水阀的密封研究

为了降低新能源汽车热管理系统多通电子水阀内部泄漏量,分析泄漏产生原因,通过模拟仿真分析和实物样件试验测量,研究密封结构对泄漏量的影响。结果表明,通过优化阀芯、阀体、密封垫的结构设计,增加密封垫的压缩量,提高零件尺寸精度减小变形可以大幅降低阀的内部泄漏量,减少各通道之间串液和热交换,从而减少能量损失,对于提高热管理系统的能量利用率降低新能源汽车能耗有非常大的贡献。

电子水阀结构优化仿真及其试验研究

新能源汽车的电子水阀在冷却液流量调节过程中存在压力损失过大的问题,针对这一问题,对现有的电子水阀进行了流道结构优化、流动特性仿真分析和试验测试研究。首先,利用Design-Expert软件设计了四因素三水平正交试验;然后,利用CFD软件对优化前后的电子水阀流道结构进行了压降仿真分析,对不同阀门开度下电子水阀的流动特性进行了分析;最后,搭建了测试试验平台进行了电子水阀的压降试验,并结合试验结果对仿真结果进行了验证。研究结果表明:经过仿真分析,优化后的电子水阀直通压降最大可降低63%,旁通压降最大可降低54.3%,流场的压力分布和流速变化有明显改善;经过试验测试,电子水阀直通压降降低了57.5%,旁通压降降低了49.9%;试验值与仿真值的相对误差在15%以内,验证了仿真结果的正确性。

CTD型一体式电子排水阀

介绍了电子排水阀工作原理及CTD电子排水阀的特点。

Numerical and Experimental Study on Dynamic Performance of Heat Pump Water Heater with Electronic Expansion Valve

A series of experiments on the dynamic performance of the HPWH （heat pump water heater） unit with EXV （electronic expansion valve） under different environmental conditions were conducted. The dynamic heating capacity and COP （coefficient of performance） of the HPWH unit under different EXV openings were measured. The effects of the EXV opening on the performance of the HPWH unit were analyzed. Meanwhile, the dynamic performance of the HPWH with EXV was simulated and the results were compared with the experimental one. The experimental results indicate that during heating process, the COP increases firstly and then decreases for a fixed EXV opening, which is in good agreement with the numerical result. For different EXV openings, the COP and heating capacity of the system using larger EXV opening are superior to those using the smaller one in the initial heating stage. While in the late stage, the performance of system using smaller EXV opening is better. It is found that the system performance is improved significantly by changing the EXV opening in the different heating period and the average COP of the HPWH system is increased by 7.6%.