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兩臺不同性能的渣漿泵串聯(lián)有什么影響
如圖1- 46所示,(H-Q)1和(H-Q)ll分別為兩臺不同性能泵的性能曲線,串聯(lián)后總性能曲線的畫法與圖1- 45相同，在流量相同的各點把揚程疊加起來，得到(H-Q)1+u性能曲線。它與管路特性h- Q曲線的交點M為串聯(lián)后的工作點。過M點作垂線，分別與(H一Q)1和(H- Q)π曲線交于A，和A2點，即兩泵串聯(lián)后的工作點，其參數(shù)仍然符與單泵在管路中工作時相比，流量增加，而揚程降低了，所以串聯(lián)后的總揚程H1.小于兩泵單獨工作時的揚程之和，減小的程度與管路特性徒峭度有關(guān)。
若管路特性曲線h - Q與串聯(lián)后性能曲線(H-Q)1.n交于C點,這時的流量和揚在與第一臺泵單獨工作時相同，第二臺泵不起作用，只消耗功率。若管路特性移到圖1-46中(h- Q)c的位置時,這時流量和揚程都小于只有第一臺渣漿泵單獨工作的流量和揚程。其原因是第二臺泵相當于裝置的過流元件，增加了阻力,減少了輸送流量。為此，C 點可以作為極限狀態(tài)，工作點只有在C點左側(cè)時串聯(lián)工作才是合理的。
What is the effect of two slurry pumps with different performance in series
As shown in Fig. 1-46, (H-Q) 1 and (H-Q) ll are the performance curves of two different performance pumps respectively. The drawing method of the total performance curve after series connection is the same as that in Fig. 1-45, and the head is superposed at each point with the same flow rate to obtain (H-Q) 1 + U performance curve. The intersection point m between it and H-Q curve is the working point after series connection. When the two pumps are connected in series, their parameters are still consistent with that of the single pump working in the pipeline, the flow rate increases, and the head decreases. Therefore, the total head H1 after the connection is smaller than the sum of the two pumps working alone, and the degree of reduction is related to the kurtosis of the pipeline characteristics.
If the pipeline characteristic curve H-Q and the performance curve after series connection (H-Q) 1. N intersect at point C, then the flow and lift are the same when the first pump works alone, the second pump does not work, only consumes power. If the pipeline characteristics are moved to the position (H-Q) C in Fig. 1-46, the flow and head are smaller than the flow and head of the first slurry pump working alone. The reason is that the second pump is equivalent to the flow element of the device, which increases the resistance and reduces the delivery flow. Therefore, point C can be regarded as the limit state, and it is reasonable to work in series only when the working point is on the left side of point C.
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