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1.洗手池的排水管仔细观察一下洗手池的排水管(如图1所示),就会发现排水管不是竖直地通入地下,而是弯曲的U形管.U形管实际上是一个连通器.当洗手池中的水排完后,在U形管的AB部分总会有一段水柱,其作用是防止下水道中的臭气通过排水管进入室内.在U形管的下部留有孔,平时用螺栓塞住,可防止杂物通过排水管进入下水道.通过这个孔可以清理U形管中沉积的杂物.
1. Drainpipe in washbasin When you look closely at the drainpipe of the sink (as shown in Figure 1), you will find that the drainpipe does not go vertically into the ground but instead is a curved U-tube. The U-tube is actually A connected device. When the water in the sink is exhausted, there will always be a water column in the AB section of the U-shaped pipe. The function is to prevent the odor in the sewer from entering the room through the drain pipe. There is left in the lower part of the U-shaped pipe. Holes, usually plugged with bolts, prevent debris from entering the sewer through the drain. Through this hole you can clean up debris from U-tubes.