供水系统中的负压倒吸现象分析与对策

Investigation on the Inverted Suction Incurred by Negative Pressure in Water Supply System and the Countermeasures

供水系统间歇式供水方式会造成主管道内部产生负压,高位水池(水库)供水管道很长时也容易产生负压。负压会产生倒吸现象,使管道外部的污水和空气进入管道内部,污染水质且腐蚀管道内壁,严重影响管道的使用寿命。结合实例对负压产生的原因进行了探讨,指出了负压对供水系统造成损害的严重性、普遍性和隐蔽性,提出了应对负压倒吸现象的技术措施。

The intermittent supply mode in water supply system will lead to negative pressure in the main pipe, and the same phenomenon also exists in long downcomers of elevated basin (reservoir). The negative pressure sucks sewage and air from the outside into the pipe, which will contaminate water and corrode the inner wall of pipe, and thus bringing serious effect on service life of the pipe. The cause of negative pressure produced in pipe is investigated, and thus the severity, catholicity and concealment of the harm to water system incurred by negative pressure is pointed out; and finally the measures for solving the negative pressure are proposed.