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換葉輪能不能調(diào)節(jié)渣漿泵流量揚(yáng)程
當(dāng)揚(yáng)程或流減需要降低15%以上或泵過大時(shí)，如采用切割葉輪方式進(jìn)行調(diào)，可能造成效率下降很多，不經(jīng)濟(jì)。此時(shí)可通過更換一個(gè)較小尺寸葉輪來實(shí)現(xiàn)流量調(diào)節(jié)，換下來的葉輪留待以后恢復(fù)流量、揚(yáng)程時(shí)使用。對(duì)于多級(jí)泵,可考慮在排出端拆去一個(gè)葉輪，并加定距套，不能在進(jìn)口端拆去葉輪，以免增加進(jìn)口阻力而出現(xiàn)汽蝕現(xiàn)象。
除上述工況調(diào)節(jié)方法外,還有改變?nèi)~片角度的調(diào)節(jié)、改變前置導(dǎo)葉葉片角度的調(diào)節(jié)以及入口管路節(jié)流調(diào)節(jié)等。前兩種方法多用于軸流泵和混流泵中，后者使用時(shí)應(yīng)注意防止離心泵的汽蝕。
另外，在長(zhǎng)輸管道運(yùn)行管理過程中,經(jīng)常采用大小泵搭配、拆級(jí)運(yùn)行(多級(jí)泵)和調(diào)速的方法,使渣漿泵適應(yīng)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.
