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采用DN75硬聚氯乙烯(PVC-U)伸顶通气系统排放粉碎后厨余垃圾时,低楼层区域出现正压过大的现象是限制该系统排放性能提高的主要原因之一。将底部两个45°弯头换成DN75×DN110的90°大曲率变径弯头,探究在该情况下,不同高度系统中正压过大的现象是否得到缓解,以提高DN75立管系统的排水能力。试验表明,改造后系统最大正、负压明显减小,系统排放性能得到大幅度提高;改造后最大正、负压的绝对值接近,系统最大正压不再是唯一限制厨余垃圾排放系统排放性能的因素。
When using DN75 rigid PVC (PVC-U) overhead ventilation system to discharge comminuted kitchen waste, the phenomenon of excessive positive pressure in the low floor area is one of the main reasons for limiting the emission performance of the system. The bottom of the two 45 ° elbow replaced DN75 × DN110 90 ° curvature reducer elbow to explore the situation in different height system overpressure is too large to alleviate the phenomenon to improve DN75 riser system Drainage capacity. The test shows that the maximum positive and negative pressure of the system is significantly reduced and the system discharge performance is greatly improved. The absolute value of the maximum positive and negative pressure after the reconstruction is close to the maximum positive pressure of the system is no longer the only limit on the discharge of the kitchen waste discharge system Performance factors.