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渣漿泵的串聯(lián)怎么工作
一、使用場合
泵的串聯(lián)工作就是將第一臺泵的出口與第一臺泵的入口相連接，以增加揚(yáng)程。常用于以下場合:
(1)單臺泵的揚(yáng)程不能滿足裝置壓力的需要時;
(2)同時要增加流量和壓力;
(3) 管路長距離輸送;
(4)改善后面一臺泵的汽蝕性能。
二、兩臺同性能泵串聯(lián)工作
圖4-2所示為相同性能泵串聯(lián)工作的運(yùn)行曲線圖，曲線I、II為兩臺泵的性能曲線，曲線I+II為串聯(lián)工作時的性能曲線，它是將單獨(dú)泵的性能曲線在同一流量下把楊程迭加起來得到的。與裝置揚(yáng)程特性曲線III相交于M點(diǎn)，M點(diǎn)即為串聯(lián)工作時的工作點(diǎn)。此時流量為Qm，揚(yáng)程為Hm。
串聯(lián)后每臺泵的運(yùn)行工況點(diǎn)可以從M點(diǎn)作縱坐標(biāo)的平行線交曲線I、II于B點(diǎn)，即為串聯(lián)后的每臺泵工作點(diǎn)。在B點(diǎn)的流量為Q1 =QII，揚(yáng)程為H ,Hm。顯然串聯(lián)工作的特點(diǎn)是流量彼此相等，即Qm = Q1=Qm,總揚(yáng)程為每臺揚(yáng)程的總和，即HM = Hq +Hm。
串聯(lián)前每臺泵的工作點(diǎn)為C點(diǎn)( Qc、He、Pc、ηc )，與串聯(lián)后的工作點(diǎn)B點(diǎn)參數(shù)相比較:
QM = Q1=QII> Qc
Hc<Hm<2Hc
(4)由于外界負(fù)荷變化很大，需要用泵的臺數(shù)來進(jìn)行調(diào)節(jié);
(5)減小備用泵的容量。
二、兩臺同性能泵并聯(lián)工作
圖4-4為兩臺同性能泵的并聯(lián)工作時的性能曲線。圖中曲線I、II為兩臺同性能泵的性能曲線，并聯(lián)工作時的性能曲線為I+II，III為裝置揚(yáng)程特性曲線。
并聯(lián)工作曲線I+II的畫法是將泵單獨(dú)的性能曲線在揚(yáng)程相等的條件下把流量迭加而成，它與裝置揚(yáng)程特性曲線皿相交于M點(diǎn)，即為并聯(lián)工作時的工作點(diǎn)，此時流量為Qm，揚(yáng)程為HM。
確定單個泵的工況，可由M點(diǎn)作橫坐標(biāo)的平行線與單臺泵性能曲線交于B點(diǎn)，即為每臺泵并聯(lián)工作時的單獨(dú)工作點(diǎn)，此時B點(diǎn)流量Qg=Q1 =Qπ，B點(diǎn)的揚(yáng)程Hn=Hq =Hye并聯(lián)工作的特點(diǎn)是:兩臺泵的揚(yáng)程相等，即Hx=Hp=Hq =Hπ,總流量為兩臺泵之和，即Qx=Qr +Qn =2Qb
未并聯(lián)前每臺泵單獨(dú)工作時的工作點(diǎn)為C (Qe、H、Pc、7。)，并聯(lián)后每臺泵的工作點(diǎn)(Q、H。、Pr、7n).比較并聯(lián)前每臺泵的參數(shù)和并聯(lián)后每臺泵的參數(shù)，可以看出:
Qb<Qc<QM<2Qc
Qm = 2Qb
Hb=Hm> Hc
這說明兩臺泵并聯(lián)工作時的流量Qm等于并聯(lián)運(yùn)行時各臺泵的流量之和，和并聯(lián)前一臺泵單獨(dú)工作時相比，兩臺泵并聯(lián)后的總流量QM小于一臺泵單獨(dú)工作時流量的2倍，而大于一臺泵單獨(dú)工作時的流量Qc。并聯(lián)后單臺泵工作的流量Qu比并聯(lián)前單臺泵工作的流量Qc小，而揚(yáng)程比并聯(lián)前單臺泵工作時高些，這是因?yàn)楣艿滥Σ翐p失隨流量的增加而增大了，就需要提高泵的揚(yáng)程來克服增加的損失，故Hb> Hc，因而流量就相應(yīng)減少了。 渣漿泵廠家
How to operate the slurry pump in series
I. use occasion
The series work of the pump is to connect the outlet of the first pump with the inlet of the first pump to increase the lift. Commonly used in the following situations:
(1) when the head of a single pump cannot meet the pressure requirements of the device;
(2) increase flow and pressure at the same time;
(3) long distance pipeline transportation;
(4) improve the cavitation performance of the latter pump.
Two pumps of the same energy operate in series
Figure 4-2 shows the operation curve of the same performance pump in series, curve I and curve II are the performance curves of two pumps, curve I + curve II are the performance curves of the two pumps in series, it is obtained by superposing the performance curves of individual pumps under the same flow. It intersects with the head characteristic curve III of the device at point m, which is the working point in series operation. At this time, the flow is QM and the lift is HM.
After series connection, the operating point of each pump can be from point m as the vertical coordinate of the parallel line intersection curve I and II to point B, that is, the operating point of each pump after series connection. The flow at point B is Q1 = QII, and the lift is h, HM. Obviously, the characteristic of series operation is that the flow is equal to each other, that is, QM = Q1 = QM, and the total head is the sum of each head, that is, HM = HQ + HM.
The working point of each pump before series connection is point C (QC, he, PC, η C), compared with the parameter of point B after series connection:
QM = Q1=QII> Qc
Hc<Hm<2Hc
(4) due to the great change of external load, the number of pumps shall be used for adjustment;
(5) reduce the capacity of standby pump.
Two pumps of the same energy operate in parallel
Figure 4-4 shows the performance curve of two pumps in parallel. The curves I and II in the figure are the performance curves of two same-sex energy pumps. The performance curves of parallel operation are I + II and III are the head characteristic curves of the device.
The drawing method of parallel working curve I + II is that the flow is superposed by the separate performance curve of the pump under the condition that the head is equal. It intersects with the head characteristic curve plate of the device at point m, that is, the working point in parallel working, at this time, the flow is QM and the head is HM.
To determine the working condition of a single pump, the parallel line with the abscissa of point m and the performance curve of a single pump can be intersected at point B, that is, the single working point of each pump in parallel operation. At this time, the flow of point B QG = Q1 = q π, and the lift of point B HN = HQ = hye in parallel operation are characterized by: the lift of two pumps is equal, that is, HX = HP = HQ = h π, and the total flow is the sum of two pumps, that is, QX = QR + QN = 2qb
Before parallel connection, the working point of each pump is C (QE, h, PC, 7). ）, working points (Q, H) of each pump after parallel connection. , PR, 7n). Comparing the parameters of each pump before and after parallel connection, we can see that:
Qb<Qc<QM<2Qc
Qm = 2Qb
Hb=Hm> Hc
This shows that the flow QM of two pumps in parallel operation is equal to the sum of the flow of each pump in parallel operation. Compared with the previous pump in parallel operation, the total flow QM of two pumps in parallel operation is less than 2 times of the flow of one pump in separate operation, and greater than the flow QC of one pump in separate operation. After parallel connection, the flow Qu of single pump is smaller than that of single pump before parallel connection, while the lift is higher than that of single pump before parallel connection. This is because the friction loss of pipeline increases with the increase of flow, so it is necessary to increase the lift of pump to overcome the increased loss, so HB > HC, so the flow is correspondingly reduced Slurry pump manufacturer
