一、发展与应用欧洲:十九世纪未至二十世纪初,设计出水环式真空泵的雏型,继而单作用型(叶轮每转一周完成一次吸气和排气)水环式真空泵的产品问世。美国:几乎与欧洲同时,另一种双作用型(叶轮每转一周完成两次吸气和排气)水环式真空泵也研制成功。日本:二次世界大战前只有仿制泵,且泵的效率低、应用仅限于水泵吸水和造纸厂中的真空脱水等。1954年双作用型水环式真空泵产品被标准化。随着工业的发展,对水环式真空泵的需要量也不断增加,特别是作为真空源,被广泛应用于化工厂的蒸发、蒸馏、干燥、脱 First, the development and application of Europe: the nineteenth century until the early twentieth century, the design of the water ring vacuum pump prototype, followed by a single role (impeller per revolution per intake and exhaust) water ring vacuum pump products come out . United States. At the same time as Europe, another double-acting water-ring vacuum pump (suction and exhaust performed twice a turn per revolution) was also developed. Japan: Before World War II, only the imitation pump, and the pump efficiency is low, the application is limited to water pump suction and vacuum dehydration in the paper mill. 1954 double-acting water ring vacuum pump products are standardized. With the development of industry, the demand for water ring vacuum pump is also increasing, especially as a vacuum source, which is widely used in the evaporation, distillation, drying,