一、前言随着我国社会主义建设事业突飞猛进的发展,石油化学工业、电力工业等部门采用的成套设备日益大型化,原有配套设备用泵暴露出越来越多的弱点,如大型化肥工业成套设备用泵:甲铵泵、液氨泵等要求的使用压力很高(P=140～225公斤/厘米~2),而流量却显得很小(Q=10～25米~3/时)。这种高扬程小流量泵 I. INTRODUCTION With the rapid development of China’s socialist construction cause, the complete sets of equipment used in the petrochemical industry, power industry and other departments have been increasingly large. The original auxiliary equipment pumps exposed more and more weaknesses, such as large-scale fertilizer industry complete sets Equipment pumps: Ammonia pump, liquid ammonia pump and other requirements of the use of high pressure (P = 140 ~ 225 kg / cm ~ 2), while the flow was very small (Q = 10 ~ 25 m ~ 3 / h). This high-lift low-flow pump