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渣漿泵軸向力的產(chǎn)生原因
(1)葉輪前后兩側(cè)因壓力不同，前蓋板側(cè)壓力低，后蓋板側(cè)壓力高，產(chǎn)生了從葉輪后蓋板指向入口處的軸向力F1,如圖1- 66所示。其中p1為時(shí)輪吸入口前壓力，P2為葉
輪出口處壓力，密封環(huán)半徑為r1，葉輪外徑為r2，輪轂半徑為rh，ab及cd曲線為葉輪兩側(cè)的壓力分布曲線。
(2)由于液流進(jìn)入葉輪和流出葉輪的方向及速度不同而產(chǎn)生的動(dòng)反力F2，其方向與F1相反。
此外，對(duì)于入口壓力較高的懸臂式單吸泵，還要考慮作用在軸端上的入口壓力引起的軸向壓力，其方向與F1相反。對(duì)于立式離心泵,其轉(zhuǎn)子的部分質(zhì)量力作用于軸向。
2. 軸向力的計(jì)算
(1)葉輪前后壓力引起的軸向方F1可按下式估算:
F1=kπ(r1-rh)(p2- p1)
(2)液體作用于葉輪入口的動(dòng)反力F2為:
F2=GCo
式中G---進(jìn)入葉輪中流體的質(zhì)量流量；
Co---葉輪進(jìn)口處的速度。
總的軸向力為:
F=F1-F2
一般來說F1較大，所以渣漿泵廠家軸向力一般指向進(jìn)口，只有在啟動(dòng)時(shí)，由于正常的軸向力還沒有建立，動(dòng)反力比較明顯。
Causes of axial force of slurry pump
(1) Due to different pressures at the front and rear sides of the impeller, the pressure at the front cover plate side is low, and the pressure at the rear cover plate side is high, resulting in the axial force F1 from the rear cover plate of the impeller to the inlet, as shown in Figure 1-66. Where P1 is the pressure in front of the suction port of the wheel, P2 is the blade
The radius of sealing ring is R1, the outer diameter of impeller is R2, the radius of hub is RH, the curves of AB and CD are the pressure distribution curves on both sides of impeller.
(2) The dynamic reaction force F2 produced by the different direction and speed of liquid flow entering and leaving the impeller is opposite to F1.
In addition, for cantilever single suction pump with high inlet pressure, the axial pressure caused by the inlet pressure acting on the shaft end should be considered, and its direction is opposite to F1. For vertical centrifugal pump, part of the mass force of the rotor acts on the axial direction.
2. Calculation of axial force
(1) The axial square F1 caused by the front and rear pressure of impeller can be estimated as follows:
F1=kπ(r1-rh)(p2- p1)
(2) The dynamic reaction force F2 of the liquid acting on the impeller inlet is:
F2=GCo
Where G is the mass flow of fluid into impeller;
Co --- speed at impeller inlet.
The total axial force is:
F=F1-F2
Generally speaking, F1 is large, so the axial force of slurry pump manufacturer generally points to the inlet. Only when starting, because the normal axial force has not been established, the dynamic reaction force is obvious.
