水槽式与嵌入式洗碗机水力性能对比

Comparative study on hydraulic performance of sink-type and embedded dishwashers

为对比研究水槽式洗碗机和嵌入式洗碗机内水泵、喷淋臂等水力部件的内流特性,以及洗碗机类型对扬程和水力效率的影响,基于SST k-ω湍流模型对2种洗碗机内部流场进行高精度数值模拟.研究结果表明:水槽式洗碗机创新实现蜗壳和喷淋臂结构二合一,有效去除管路系统,不仅避免了管路的藏污纳垢,且整机的水力效率比嵌入式洗碗机高2%,同时具有较高的整机扬程,但是其创新结构使得泵内复合式叶轮存在叶顶间隙涡、轴向旋涡等不利流动现象,其水力模型有待优化.嵌入式洗碗机则存在明显的“大马拉小车”现象,水泵和附加流道等过流部件均需改进和优化.对2种洗碗机内水泵水力性能对比分析的研究结果可为创新设计新型洗碗机提供参考.

In order to compare the internal flow performance of hydraulic components and the influence of dishwasher type on head and hydraulic efficiency,the internal flow field of pump,spray arm and other components in two kinds of dishwashers were compared and analyzed based on the SST k-ω turbulence model with high precision.The results show that the innovation of the sink-type dishwasher combines the two-in-one structure of the volute and the spray arm to effectively eliminate the pipeline system.The sink-type dishwasher avoids the accumulation of filth in the pipeline,improves the dish washer head,as well as increases the hydraulic efficiency by 2% than that of the embedded dishwasher.However,its innovative structure results in unfavorable flow phenomena such as the tip leakage vortex and axial vortex in the compound impeller of the pump.Therefore,its hydraulic model needs further optimization.Embedded dishwashers have an obvious phenomenon of″big horse pulling a small cart″,and the flow passage components such as water pumps and additional flow channels need to be improved.The comparison of the hydraulic performance of the water pump in two dishwashers reveals the advantages and disadvantages of sink-type and embedded dishwasher design,which provides a reference for the innovative design of new dishwashers.