七流道球型止回阀的结构设计及性能分析

Structural design and performance research of seven-channel spherical check valve

针对当前止回阀在使用过程中普遍存在的问题和缺点,对管道直径DN≥200 mm管道系统,开发设计了一种七流道球型止回阀,并在止回阀的后阀体设计中采用异型锥形体结构,有效地改善了钢心胶球在球阀全开时的颤抖,减小整个球阀水力损失;优化了球罩的长度尺寸L和关阀路径S,控制突然停泵时止回阀关闭产生的水锤压力大小,减轻对管道系统的破坏.同时利用UG软件建立止回阀的三维模型,采用Fluent软件对七流道球型止回阀的内部流动进行了数值模拟,并在同一水锤试验台上,在相同的测试条件下,对DN=500 mm的七流道球型止回阀和旋启式止回阀进行了水锤和水力损失对比试验.结果表明:在突然停泵时,同口径的七流道球型止回阀与旋启式止回阀相比,阀体前的最大水锤压力只为旋启式止回阀的1/2,其阀门的关阀时间延长了1倍以上,并且,在相同的过流条件下,其水力损失只为旋启式止回阀的10%.

A seven-channel spherical check valve was designed to solve the prevailing problem and to overcome disadvantages of check valves for DN≥200 mm piping system.UG software was used to establish the model of the seven-channel spherical check valve.By using CFD technique,the internal flow of the seven-channel spherical check valve was numerically simulated.On the same water hammer test rig,the water hammers and hydraulic losses of spherical and swing check valves were tested and compared.The results show that the maximum water hammer pressure of the seven-channel spherical check valve is only half of the swing check valve,the closing time of the former is double of the latter,with the same diameter for hard shutdown condition of the pump.In the same throughout flow condition,the hydraulic loss of the former is only 10% of the latter.