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基于水泵停泵时的泵后非瞬时降压特性,给出了空气罐设置位置的选取原则和方法,结合工程算例,提出仅在管道中部设置空气罐防护方案和在管道中部开始串联设置空气罐防护方案,并通过数值模拟方法将这两种方案与常见的泵后设置空气罐防护方案进行水锤防护效果比较。结果表明,在防护效果相近的情况下,采用在管道中部开始串联设置空气罐的防护方案所需的空气罐容积最小,同时该方案下的罐内气体最大压力也相对较小,对空气罐的受力结构要求相对较低。在串联空气罐防护方案中,首端空气罐的主要作用是抑制管道压力降低,末端空气罐的主要作用是抑制管道压力升高。因此,在考虑串联空气罐的容积优化时,应结合输水系统水锤防护的实际需要,当输水管线的降压严重时,可考虑增大首端空气罐容积;当输水管线正压过大时,可考虑增大末端空气罐容积。
Based on the non-instantaneous pressure-reducing characteristics of pump after pump stoppage, the principle and method of choosing the location of air tank are given. Combined with engineering examples, it is proposed that only the air tank protection scheme should be set in the middle of the pipeline and air should be set in series in the middle of the pipeline Tank protection program, and through the numerical simulation method of these two programs with the common air pump after the pump protection programs for water hammer protection effect comparison. The results show that with the same protection effect, the minimum volume of air tank required for starting the air tank in the middle of the pipeline is the minimum, and the maximum pressure of the air in the tank under this scheme is relatively small. Force structure requires relatively low. In tandem air tank protection programs, the primary role of the head air tank is to suppress the pressure drop in the pipe. The main role of the end air tank is to suppress the pressure increase in the pipe. Therefore, when considering the volume optimization of tandem air tank, the actual needs of water hammer protection should be considered. When the depressurization of the water line is serious, the volume of the air tank at the head end may be increased. When the pressure of the water line is positive Too large, consider increasing the end of the air tank volume.