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我国广大的北方地区井灌十分普遍。因此,如何发挥这些机井的作用?增加它的出水量?值得认真讨论研究。 1.机井合理配泵的两个基本条件 (1)井泵合理配套。机井出水量最好和水泵最优工况点的流量(注在铭牌上)相等,如不等,应使水泵“工作点”居于水泵的高效率区内(泵样本上有此推荐范围)。 (2)扬程合理配套。水泵的实际安装高程Hg和损失扬程之和必须保证不超过泵样本上规定的允许吸上真空高度Hs。从水泵的汽蚀性能试验知道,当水泵吸程超过临界吸上真空高度时,泵的扬程、流量、功率急剧下降,机组剧烈振动甚至断流。长期在此区内工作,过流部件会迅速损坏。所以泵样本中一般均根据试验的临界吸上真空高度,考虑0.3～0.5米的余量,确定水泵的
Well irrigation in the vast northern areas of our country is very common. Therefore, how to play the role of these wells? To increase its water output? It is worth serious study. 1. Well with a reasonable rationing pump two basic conditions (1) well pump reasonable package. The best water pump wells and pumps the best working conditions of the traffic (Note on the nameplate) is equal, if not, should make the pump “working point ” living in the pump’s high efficiency area (pump samples have this recommended range ). (2) Lifting a reasonable package. The sum of the actual installation elevation Hg of the pump and the head of loss must be guaranteed not to exceed the allowable suction height Hs specified on the pump specimen. From the cavitation performance test of the pump, it is known that when the pump suction exceeds the critical suction vacuum height, the lift, flow and power of the pump drop sharply, and the unit violently vibrates and even stops. Long-term work in this area, over-current components will be rapidly damaged. Therefore, the pump samples are generally based on the critical height of the vacuum suction test, taking into account the margin of 0.3 to 0.5 meters to determine the pump