隔膜计量泵的改良设计与汽蚀性能的提高

针对应用于石油化工装置上的进口隔膜计量泵容易产生的汽蚀问题，对隔膜泵复合隔膜、柱塞密封副、液压平衡与补偿阀结构进行了改良设计，采用较大承载能力的机座、独特阶梯式活塞、加大直径的活塞、PTFE＋NBR复合隔膜，改良放气安全阀及油浸没式补偿系统等方法，提高了隔膜计量泵的汽蚀性能；通过对改造的隔膜计量泵与原有的计量泵进行的汽蚀试验对比，给出了隔膜计量泵性能与现场使用的最佳匹配工况。改良的结构设计和新型材料的选用大大提高了计量泵的汽蚀性能。

Improvement on cavitation performance of diaphragm metering pump

Concerning with the problem of cavitation easily occurring on the imported diaphragm metering pump in petrochemical plant,an improvement design is made on the composite membrane of diaphragm pump,pair of plunger seals,structure of hydraulic balance and compensating valve.Methods are taken such as to improve the safety relief valve and oil immersion type compensation system,to adopt pump base with bigger bearing capacity and unique staged plunger,to increase piston diameter and to adopt PTFE NBR composite membrane,etc.To improve the cavitation performance of diaphragm metering pump,a comparison of cavitation test is made between the modified diaphragm metering pump and the original measuring pump.The improved structural design and adoption of new materials have greatly improved the cavitation performance of metering pump.