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兩臺(tái)不同性能的渣漿泵并聯(lián)工作
圖4-5為兩臺(tái)不同性能泵并聯(lián)工作時(shí)的性能曲線。圖中曲線I、I為兩臺(tái)不同性能泵的性能曲線，曲線I+I為并聯(lián)后的性能曲線，畫法同上。III為裝置揚(yáng)程性能曲線，與并聯(lián)后的性能曲線I + I的交點(diǎn)M, M點(diǎn)就是并聯(lián)工作時(shí)的工作點(diǎn)，此時(shí)流量為Qm，揚(yáng)程為Hm。
確定并聯(lián)時(shí)單臺(tái)泵的運(yùn)行工況，可由M點(diǎn)作橫坐標(biāo)的平行線交于A、B兩點(diǎn)，即為每臺(tái)泵并聯(lián)工作時(shí)的單臺(tái)泵工作點(diǎn)，流量為Qa、Qb揚(yáng)程為H，、Hh。并聯(lián)工作的特點(diǎn)是:揚(yáng)程彼此相等，即H =H =H。，總流量為每臺(tái)聚輸送流量之和，即Qm=Qa+Qb。
并聯(lián)前每臺(tái)泵的單獨(dú)工作點(diǎn)為C、D兩點(diǎn)，流最為0c、Q。.揚(yáng)程為H、H。由圖4-5看出：
這說明兩臺(tái)不同性能泵并聯(lián)式總流量Qm等于并聯(lián)后各臺(tái)泵流量之和，即QM=QA+Qb，但總流量小于并聯(lián)前各臺(tái)泵單獨(dú)工作的流量之和，其減少的程度隨臺(tái)數(shù)的增加和設(shè)置揚(yáng)程特性曲線越陡直，則輸出的總流量就減少的越多。
由圖4-5可知，當(dāng)兩臺(tái)不同性能的泵并聯(lián)時(shí)，揚(yáng)程小的泵輸出流量很少。甚至輸送不出去，所以并聯(lián)效果不好，若并聯(lián)工作點(diǎn)在C點(diǎn)以左，即總流址0.小于0時(shí)應(yīng)該停用揚(yáng)程小的臺(tái)泵。 不同性能泵的并聯(lián) 工作較復(fù)雜，故實(shí)際中很少采用。
四、泵并聯(lián)工作時(shí)注意事項(xiàng)
(1)泵并聯(lián)工作時(shí)最好是泵的揚(yáng)程相同或相差較小，以避免揚(yáng)程小的那臺(tái)泵發(fā)揮作用很小或不發(fā)揮作用，應(yīng)盡量采用兩臺(tái)同性能的泵并聯(lián)工作。
(2)泵并聯(lián)工作時(shí)，泵的進(jìn)出口管路基本上要對(duì)稱相同，以避免管路阻力大的那臺(tái)泵作用減小。
(3)選擇泵的流量Q =效率點(diǎn)工作。
(4)泵的配用功率要注意，如果單臺(tái)泵運(yùn)行時(shí)流量為0。來選擇配用功率，以防原動(dòng)機(jī)超功率。
(5)為達(dá)到并聯(lián)后增加較多流量的目的，泵的性能曲線應(yīng)當(dāng)陡直一些較好。
(6)為達(dá)到并聯(lián)后增加較多流量的目的，裝置揚(yáng)程特性曲線越平坦越好，也就是應(yīng)增加出口管路直徑，減小阻力系數(shù)以適應(yīng)并聯(lián)后能增大流量的需要。渣漿泵廠家
Two slurry pumps with different performance work in parallel
Figure 4-5 shows the performance curve of two pumps with different performance in parallel. Curve I and I in the figure are the performance curves of two pumps with different performance, curve I + I is the performance curve after parallel connection, the drawing method is the same as above. III is the head performance curve of the device, M is the intersection point of the performance curve I + I after parallel connection, M is the working point during parallel operation, at this time, the flow is QM, and the head is HM.
To determine the operation condition of a single pump in parallel, the parallel line with m point as the abscissa can intersect with a and B points, that is, the single pump working point in parallel operation of each pump, with flow of QA and QB and head of H and H. The characteristic of parallel operation is that the lift is equal to each other, i.e. H = H = H. , the total flow is the sum of each aggregate transportation flow, i.e. QM = QA + QB.
Before parallel connection, the independent working point of each pump is C and D, and the flow is 0C and Q. . the lift is h, H. As shown in Figure 4-5:
This shows that the total flow QM of two parallel pumps with different performance is equal to the sum of the flow of each pump after parallel connection, that is, QM = QA + QB, but the total flow is less than the sum of the flow of each pump before parallel connection, and the degree of reduction is more with the increase of the number of pumps and the steeper the set head characteristic curve, the more the total output flow is reduced.
It can be seen from figure 4-5 that when two pumps with different performance are connected in parallel, the output flow of the pump with small head is small. If the parallel operation point is to the left of point C, i.e. the total flow address is 0. Less than 0, the pumps with small head should be stopped The parallel operation of pumps with different performance is complex, so it is rarely used in practice.
IV. precautions for parallel operation of pump
(1) when the pumps are in parallel operation, it is better to have the same or smaller difference in lift, so as to avoid that the pump with small lift has little or no effect. Two pumps with the same performance should be used as much as possible.
(2) when the pumps work in parallel, the inlet and outlet pipes of the pumps should be basically symmetrical and the same, so as to avoid the reduction of the function of the pump with large pipeline resistance.
(3) select pump flow Q = efficiency point to work.
(4) pay attention to the matching power of the pump, if the flow is 0 when a single pump is running. To select the matching power to prevent the prime mover from over power.
(5) in order to increase more flow after parallel connection, the performance curve of the pump should be steeper and straighter.
(6) in order to increase more flow after parallel connection, the flatter the head characteristic curve of the device is, the better. That is to say, the diameter of outlet pipeline should be increased and the resistance coefficient should be reduced to meet the need of increasing flow after parallel connection. Slurry pump manufacturer
