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空气芯水膜旋转流下水立管是法国建筑科学技术中心在进行多次试验的基础上于1967年提出来的。它取消了外部的辅助通气管,但没有取消必须的通气,反而加强了管内的通气作用。因而仍符合法国规范规定。下水立管中空气芯水膜旋转流是由一种名叫塞克斯蒂阿(Sextia)的管道接头配件产生的。它能使从立管中流下来的水、从横支管中流入的水沿管壁旋转而下,同时使立管从上到下始终形成一个空气芯,这空气芯约占管道横截面积的80％左右。正因为立管
The rotation of the air core water film into the water riser was proposed by the French Architecture Science and Technology Center in 1967 on the basis of several tests. It eliminated the external auxiliary ventilation tube, but did not cancel the necessary ventilation, but instead enhanced the ventilation effect within the tube. It is still in compliance with French regulations. The swirling flow of the air core water film in the riser is produced by a pipe joint fitting called Sextia. It can make the water flowing down from the riser and the water flowing from the horizontal pipe rotate down the pipe wall, and at the same time make the riser always form an air core from top to bottom. This air core accounts for about 80 of the pipe cross-sectional area. %about. Because of the riser