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渣漿泵的功率和效率
1. 機(jī)械效率
離心泵的機(jī)械效率是指水力功率Ph與軸功率P之比，用來(lái)衡量機(jī)械損失功率△Pm的大小,用7來(lái)表示:
2.容積效率
離心泵的容積效率是指實(shí)際流量Q與理論流量Qt之比,用來(lái)衡量離心泵流量損失的大
小，用η來(lái)表示:
ηv=Q/QT=1-q/Qt
3.水力功率和水力效率
離心泵的水力功率是指單位時(shí)間內(nèi)葉輪給出的能量,用Ph來(lái)表示:
Ph= pgQrHr
式中Ht----理論揚(yáng)程 ,m;
Qt----理論流量，指不考慮流量損失時(shí)的流量,m2/s。
離心泵的水力效率是指有效揚(yáng)程H與理論揚(yáng)程Ht之比，用來(lái)衡量流動(dòng)損失的大小，用ηh來(lái)表示:
ηh=H/HT
4.軸功率和總效率
軸功率與以上各種功率之間的關(guān)系為: 渣漿泵廠家
式(1-43)說(shuō)明，泵的總效率η等于容積效率ηv，水力效率ηh和機(jī)械效率ηm三者的乘積。要提高泵的效率，就必須從設(shè)計(jì)、制造和運(yùn)行等諸方面考慮、減少各種損失。一般離心泵各種效率的參考值列于表1-3中。
Power and efficiency of slurry pump
1. Mechanical efficiency
The mechanical efficiency of centrifugal pump refers to the ratio of hydraulic power pH to shaft power P, which is used to measure the magnitude of mechanical loss power △ PM, expressed by 7:
2. Volumetric efficiency
The volume efficiency of centrifugal pump refers to the ratio of actual flow Q to theoretical flow QT, which is used to measure the large flow loss of centrifugal pump
Small, denoted by η:
ηv=Q/QT=1-q/Qt
3. Hydraulic power and efficiency
The hydraulic power of centrifugal pump refers to the energy given by impeller in unit time, which is expressed in pH:
Ph= pgQrHr
Where HT - Theoretical lift, m;
QT - theoretical flow, refers to the flow without considering the flow loss, m2 / s.
The hydraulic efficiency of centrifugal pump refers to the ratio of effective head h to theoretical head HT, which is used to measure the flow loss, expressed by η H:
ETA h=H/HT
4. Shaft power and total efficiency
The relationship between shaft power and above power is: slurry pump manufacturer
Formula (1-43) shows that the total efficiency η of the pump is equal to the product of volumetric efficiency η V, hydraulic efficiency η h and mechanical efficiency η M. In order to improve the efficiency of the pump, we must consider and reduce all kinds of losses from the aspects of design, manufacture and operation. The reference values of various efficiency of general centrifugal pump are listed in table 1-3.
