渣浆泵/河北渣浆泵/渣浆泵厂家/潜水渣浆泵/河北沐阳泵业有限公司
全国客服热线
18631165157
渣浆泵叶轮入口边磨损对汽蚀特性的影响

渣浆泵叶轮入口边磨损对汽蚀特性的影响

作者:admin    来源:未知    发布时间:2019-10-04 10:52    浏览量:
渣浆泵叶轮入口边磨损对汽蚀特性的影响
下面评价叶片入口边磨损对汽蚀特性的影响,利用上面例子中泵的参数。
叶片磨损前叶轮入口叶片圆周速度
液流径向速度叶片磨损前泵的汽蚀会量
叶轮叶片入口边磨损后,圆周速度增大,等于18.8m (参阅上述例子),而径向速度减小,等于1.71m/s. 这时参数(e/u)tan(p/2)减到0.0244. 但是速度头u/2g增大,ml/2g-18. 8m.
     利用图3-7-12,得到叶片入口边磨损100mm后,2g0h/ui -0.24,于是sh-(ut/2g)X0.24=4.33,即由于叶片入口边磨损,允许吸上高度大约减小0.5m。
     在运行过程中产生的叶片工作面磨损对扬程变化没有影响,直到叶片出口边开始磨损之前,因为叶片出口边磨损实际上导致叶片出口直径减小。根据车削叶轮出口真径的公式(P. A.鲍格尼茨卡娅试验得到的公式)计算泵扬程和流量下降值

因为在运行过程中密封件磨损,所以为防止固体颗粒进入泵的前腔,要供给冲洗水。但是,根据E H.柯热夫尼柯娃资料,为了完全避免颗粒进入密封处,冲洗水量应为泵流量的10%左右。在运行实践中,很少考虑到这么大的水量(因而有很大的附加能耗)。在中小型渣浆泵上一般不供给冲洗水。
    强制降低冲洗水量,将会导致密封件磨损和间隙相应地增大。在混合物中存在大量的泥沙小颗粒时,它们将进入密封间隙。由于密封表而磨损,间隙增大,因而溢流量增大。同时,当液体流量在叶轮内为定值时,泵流最减少了附加溢流量q,在保持扬程和功率相同时(图3-7-13), 泵每个性能点移向小流量区。如果管网系统性能保持不变,那么系统中的流量就要下降。在各种结构的固液泵上,预先考虑运行过程中调节密封间隙的可能性(在泵上移动相应密封件,小泵上移动整个转子),这就有可能在相当长的时间内保持泵泵特性实际上的恒定.渣浆泵

Influence of impeller side wear on cavitation erosion characteristics of slurry pump
The influence of blade inlet side wear on cavitation characteristics is evaluated, and the parameters of the pump in the above example are used.
Impeller circumference speed before blade wear
Cavitation capacity of pump before blade wear of radial velocity of liquid flow
After the wear of the impeller blades, the circumferential speed increases, equal to 18.8m (see the above example), while the radial velocity decreases, equal to 1.71m/s., when the parameter (e/u) Tan (p/2) is reduced to 0.0244., but the velocity head u/2g increases, ml/2g-18. 8m..
Using figure 3-7-12, the 2g0h/ui -0.24 and sh- (ut/2g) X0.24=4.33 after the wear of 100mm at the inlet edge of the blade is obtained, that is to say, due to the wear of the blade inlet side, the suction height is allowed to decrease approximately 0.5m.
The blade working face wear during operation has no effect on the head change, until the blade outlet edge begins to wear, because the blade outlet edge wear actually causes the blade outlet diameter to decrease. According to the formula of the true diameter of the turning impeller outlet (P. A. Baughnitskaya test formula), the drop value of pump head and flow is calculated.
 
In order to prevent solid particles from entering the front chamber of the pump, flushing water should be supplied because of the wear and tear of the seals during operation. However, according to e H. Kozhevnikova, in order to completely avoid particles entering the seal, the flushing water volume should be about 10% of the pump flow. In practice, little consideration has been given to such a large amount of water (hence a large additional energy consumption). Flushing water is not usually supplied on small and medium-sized slurry pumps.
Forced reduction of flushing water will lead to wear and clearance of seals increased accordingly. When there are a large number of small sediment particles in the mixture, they will enter the sealing gap. Because of the wear and tear of the sealing table, the clearance increases and the overflow increases. At the same time, when the liquid flow rate is fixed in the impeller, the additional overflow q is minimized. When the head and power are the same (Fig. 3-7-13), each performance point of the pump moves to a small flow area. If the performance of the network system remains unchanged, the flow in the system will decrease. On the solid-liquid pumps with various structures, the possibility of adjusting the seal clearance during operation (moving the corresponding seal on the pump and moving the whole rotor on the small pump) is considered in advance, which makes it possible to keep the pump characteristics virtually constant for a considerable period of time.

相关新闻推荐

在线客服 :

服务热线:18631165157

电子邮箱: 415130881@qq.com

公司地址:河北省保定市安国市南阳工业区177号

河北沐阳泵业有限公司 ,位于河北省安国市南阳工业区,地理位置优越、交通便利。公司注册资金300万元,专业生产 渣浆泵 等各类泵产品及配件,是目前国内渣浆泵行业技术实力优厚的生产厂家之一,拥有自己的生产经营实体企...

友情链接: 河北鼎峰桩工   
Copyright © 2002-2017 河北沐阳泵业有限公司 版权所有 Power by DeDe58