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一、前言为了满足喷灌事业发展的需要,根据中国科学院一九七六年至一九八五年全国科学技术发展规划重点项目第五项《我国北方干旱、半干旱地区水利资源的开发利用》中灌溉新技术规划,一九七六年成立了“全国喷灌自吸泵联合设计组”,承担研制2英寸和2.5英寸喷灌自吸泵的任务。按规定的设计指标计算,这两种泵的比转数较低(分别为44.1与49.5),要求的水泵效率较高(分
I. Preface In order to meet the needs of the development of sprinkler irrigation, according to the fifth item of “Key Projects of National Science and Technology Development Plan” from 1976 to 1985 in Chinese Academy of Sciences for “Development and Utilization of Water Resources in Arid and Semi-arid Regions in North China” Irrigation new technology planning, in 1976 set up a “national sprinkler suction pump joint design team”, undertake the task of developing 2 inches and 2.5 inches sprinkler suction pump. Calculated according to the specified design specifications, the specific rotations of these two pumps are lower (44.1 and 49.5, respectively) and the required pumps are more efficient