微灌多级复合网式过滤器的设计和试验

The Design and Test of Multi-stage Composite Screen Filter for Micro-irrigation

网式过滤器是微灌系统上广泛应用的过滤装置之一,微灌上常将不同过滤精度的过滤器组合使用以达到更好的过滤效果,但这同时也导致过滤器组出现了占据空间大、连接件多、清洗不便等问题。基于此,在分析网式过滤器过滤机理的基础上,设计了一种微灌多级复合网式过滤器,将不同过滤精度的筛网有效集中在同一壳体内,同时设计了对多级滤网进行清洗的刷体,并设计了控制装置。在设计的基础上,试制了样机,展开了水力性能试验,结果表明:自主研发的复合网式过滤器清洁压降变化规律仍近似于网式过滤器,可用幂函数表示;在过流量30 m^3/h情况下,复合网式过滤器的水头损失仅1.5 m,证明了其结构的合理性。

Mesh filter is one of the filter devices widely used in the micro-irrigation system.In order to achieve better filtering effect,filters with different filtering precision are often combined in the micro-irrigation system.However,it also leads to problems such as large space occupied by the filter group,many connecting parts and inconvenient cleaning.In response to these issues,based on the analysis of the filter mechanism of the mesh filter,a micro-irrigation multi-stage composite mesh filter was designed to effectively concentrate the screens with different filtration precision in a same casing,and a brush body for cleaning the multi-stage filter was designed and a control device was also designed.On the basis of the design,the prototype was produced and the hydraulic performance test was carried out.The results showed that the clean pressure drop curve of the self-developed composite mesh filter still conformed to the mesh filter,which could be expressed by a power function.The head loss was only 1.5 m in the case of over flow 30 m^3/h,which proved the rationality of its structure.