内镶片式齿型迷宫滴头抗堵塞试验研究

Experimental study on anti-clogging performance of dental labyrinth flow passage of drip emitters

依据ISO滴头堵塞检测方法中"短周期堵塞测试程序",测试了国内外15种内镶片式齿型迷宫滴头的抗堵塞性能。结果表明:用单一结构参数(流道宽度W、流道深度D、齿高度h和齿角度θ)表征其抗堵塞性能存在局限性;结构特征参数(断面最小尺寸min(D,W)、水力半径R和齿间距l)能较好反映滴头流道横、纵断面的结构特征,在不同程度上表征了流道的抗堵塞性能,且在试验条件下各自均存在抗堵塞临界值;滴头额定流量Qr和迷宫滴头径粒比η与抗堵塞性能相关性较好,且存在抗堵塞临界值。当各参数小于其临界值时,滴头极易堵塞,且抗堵塞性能随结构特征参数、额定流量和迷宫滴头径粒比的增大而明显提高;反之,滴头抗堵塞性能较强,滴头抗堵塞性能对各参数的增大不敏感。该试验结果可为滴头流道优化设计提供参考。

Based on ＂short term clogging test procedure＂ in ISO clogging test methods for drip emitters, 15 kinds of dental labyrinth drip emitters from home and abroad were tested for anti-clogging ability. The results show that single structure parameters （width and depth of flow path/passage, and height, and angle of dentations） are local and difficult to represent the anti-clogging ability of emitters. Characteristic structure parameters（minimum size of cross section, hydraulic radius and dentitions spacing） can represent the anti-clogging ability of emitters in a sense. There are anti-clogging critical values under the test. Rated flow Qr and the ratio of diameter of labyrinth passage to diameter of particle η are well cor related to the anti-clogging ability and have anti-clogglng critical values too. The emitters are easy to be clogged and the antl-clogging ability increases with the increase of characteristic structure parameters, rated flow and the ratio of diameter of labyrinth passage to diameter of parti- cle when the parameters are less than the critical values. Contrariwise, the emitters have stronger anti-clogging ability. The anti-clogging ability is no longer sensitive to the increase of the parameters. The research results provide references for optimization design of dental labyrinth drip emitters.