序言: 用于井中之泵,不论水管深度(SETTING)若何,一般人概称之为深井泵。今加一「特」字(为文之杜撰),系指管长650英尺以上者而言。在此以上,调节法不能凭经验,要有计算方可。水管深度四五十年来停滞于1500英尺左右,主要原因在于叶轮调节困难之故,又特深井泵概用闭式叶轮与闭式传动轴,绝无例外。 Preamble: For wells in the pump, regardless of the depth of the pipe (SETTING) how, most people call it a deep well pump. The word “special” is added hereafter to refer to the person who is over 650 feet in length. At this point, the regulatory law can not be based on experience, have to calculate before. The water depth has stagnated at about 1,500 feet in four or five decades. The main reason is that the impeller is difficult to adjust, and there is no exception to the closed-type impeller and closed-type drive shaft that are specially designed for deep well pumps.