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秋霞电影网在线观看伦
添加時間:2020.03.02

秋霞电影网在线观看伦
   
當揚程或流減需要降低15%以上或泵過大時,如采用切割葉輪方式進行調,可能造成效率下降很多,不經濟。此時可通過更換一個較小尺寸葉輪來實現流量調節,換下來的葉輪留待以後恢複流量、揚程時使用。對于多級泵,可考慮在排出端拆去一個葉輪,並加定距套,不能在進口端拆去葉輪,以免增加進口阻力而出現汽蝕現象。

除上述工況調節方法外,還有改變葉片角度的調節、改變前置導葉葉片角度的調節以及入口管路節流調節等。前兩種方法多用于軸流泵和混流泵中,後者使用時應注意防止離心泵的汽蝕。
   
另外,在長輸管道運行管理過程中,經常采用大小泵搭配、拆級運行(多級泵)和調速的方法,使適應輸送量的變化。

Can the flow head of slurry pump be adjusted by changing impeller

When the head or flow reduction needs to be reduced by more than 15% or the pump is too large, if the impeller is cut for adjustment, it may cause a lot of efficiency reduction and uneconomical. At this time, the flow can be adjusted by replacing a smaller impeller. The replaced impeller will be used when the flow and head are recovered later. For multi-stage pump, it can be considered to remove an impeller at the discharge end, and add a distance sleeve. It is not allowed to remove the impeller at the inlet end, so as to avoid cavitation caused by increasing the inlet resistance.

In addition to the above regulation methods, there are also the regulation of changing the blade angle, the regulation of changing the blade angle of the front guide vane and the throttle regulation of the inlet pipeline. The first two methods are mostly used in axial flow pump and mixed flow pump, while the latter should be used to prevent cavitation of centrifugal pump.

In addition, in the process of long-distance pipeline operation and management, the method of matching large and small pumps, dismantling stage operation (multi-stage pump) and speed regulation is often used to make the slurry pump adapt to the change of transportation capacity.







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