文档介绍：摘要
给水泵最小流量控制装置是给水泵的自动保护装置.
,几何高度已成定值,吸水管的阻力随水泵流量的减少而减少,,给水泵总的必需气蚀余量,却随着流量的减少,,除了给水在泵中获得一定能量外,,,引起进水温度的升高,提高了相应的汽化压头,从而加大了总的气蚀余量,这个现象随着流量的减少,水泵效率的降低,耗功转化为热能的愈增多而愈甚,直到总的必需气蚀余量等于有效的气蚀余量时为止,该流量叫做最小允许流量.
关键词:给水泵,最小流量控制,流量阀
Abstract
The control device of minimum flow of the feed water pump is the automatic protector of the feed water pump. Rk the surplus of effective cavitation erosion water pump is the automatic protector of the feed water pump. In operating the power plant, the geometirc height has already e definite value, the resistance of sucking the water pipe is reduced with reduction of the flow of the water pump, so cavitate effectively the surplus increase with the reduction of the flow instead. But feed water pump must cavitate surplus while being total, with the reduction of the flow, increase after reducing. This is because the axle power, to flowing through the nearly pressing under heat insulation of the water pump, except supplying water and obtaining certain energy in the pump, other wasted work are turned into heat energy. Will cause Wen Sheng of pump water when surfacing can't totally take it away ing. It because and not last surfacing and the end at impeller rings sealed first and after equilibrium device let out if turning on the water , last water pump entry , cause into the rising of water temperature , press the head after improving the corresponding vaporization , thus strengthened the total surplus of cavitation erosion , this phenomenon, with the reduction of the flow, the reducing of the water pump efficiency, the wasted work is transformed for increase of healing of heat energy, until the fact that a total one must cavitate surplus equal to effective cavitation erosion at the surplus, this flow is named allowing the flow minimumly[18]
Keyword: feed water pump, the minimum flow is co