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渣浆泵工作状态对叶片磨损的影响举例

渣浆泵工作状态对叶片磨损的影响举例

作者:admin    来源:未知    发布时间:2019-10-01 11:06    浏览量:
渣浆泵工作状态对叶片磨损的影响举例
现在研究泵工作状态即速度C。对叶片入口边磨损不均匀影响的例子。假定求最佳状态的流量Q=4000m3/h;固液混合物由粗颗砂和砾石组成系数C=0.5;叶轮入口直径D。=600mm;固液混合物在叶轮入口流速co=3.93m/s。
    确定叶片入口边磨损不均勾度的参数。叶轮叶片入口磨损不均匀系数K=1.18.这就表明,入口边最大线性磨损(根据列举数据);比平均磨损量大18%,即叶片沿着宽度方向磨损相当均匀。将流量增加40%,入口速度即为co=5.5m/s,。叶片入口边磨损不均匀系数K=1.34,叶片入口最大线性磨损比平均磨损量大34%。
    因而,流量的增加将导致叶片入口边磨损不均匀度增大,而泵在小流量工作时,入口边磨损将更加均匀。
迎面阻力系数C可以采用水力输送计算时推荐值,表3-7-4列出混合物中不同颗粒粒径的系数C值。
除了叶片之外,叶轮的前盖板和后盖板磨损相当严重,而且它们表面磨损的分布很不均匀,出现局部很深的磨损坑,相对于叶片布置,这些坑位置是被严格限定的。局部磨损是叶片入口边绕流时产生的脱流的结果。在脱流区产生反向流动,在这种情况下,同一个颗粒可能不止一次地与磨损表面接触。
    固液混合物液流在叶轮入口转向是固体颗粒在后盖板处浓度增高和前盖板处浓度降低的原因。随着泵流量的增加,固体颗粒沿着叶片宽度上分布不均匀性增加和后盖板处颗粒数量增加,这将导致局部磨损增强。同时固体颗粒在前盖板处的浓度相应降低,也就是说前盖板磨损减小。
   参数店VC/gD。可以作为评价前后盖板相对磨损强度的判据。
    根据詹德曼的试验资料,在泵输送砾石混合物时,得到后盖板最大磨损量(82) 和前盖板最大磨损量(8、) (按照磨损深度)之出8218与因子JC1gD.之间的关系,见表3 -7-5。
    盖板磨损不影响泵的性能,当出现穿孔时,护板就损坏。
    从上述资料可以看出,在参数JC/gDa 值较小时,即在泵小流量状态,前盖板比后盖板磨损快。反之,参数VC/gD.有较小值时,首先导致后盖板磨损。应该注意,在较大流量状态,叶轮后盖板磨损比前盖板快1~2倍,而在很小流量状态,前盖损坏比后盖板早,这就是由于较之后盖板有较大冲角所引起的较强脱流所致。渣浆泵


Examples of the influence of slurry pump working condition on blade wear
Now the working state of the pump, i. e. speed C, is studied. The effect of uneven wear on the inlet edge of the blade is illustrated. It is assumed that the flow rate of the optimum state is Q=4000m3/h; the composition of solid liquid mixture is composed of coarse sand and gravel, and the impeller inlet diameter is C=0.5 D. =600mm; solid-liquid mixture at impeller inlet velocity co=3.93m/s.
The parameters of wear and tear of the inlet edge of the blade are determined. The wear coefficient of impeller blade inlet is K=1.18., which indicates that the maximum linear wear at the inlet side (according to the enumeration data) is 18% larger than the average wear volume, that is, the blade wears fairly uniformly along the width direction. Increase the flow rate by 40%, and the entry speed is co=5.5m/s. The wear coefficient of the blade inlet is K=1.34, and the maximum linear wear of the blade inlet is 34% larger than that of the average wear.
As a result, the increase of flow rate will lead to the increase of non-uniform degree of wear at the inlet edge of the blade, and the wear of the inlet side will be more uniform when the pump works at low flow rate.
The head-on drag coefficient C can be calculated using the recommended values for hydraulic conveying. Table 3-7-4 shows the coefficient C values for different particle sizes in mixtures.
In addition to the blades, the wear of the front and rear cover plates of impellers is quite serious, and their surface wear distribution is very uneven, and there are local deep wear pits. Compared with the layout of the blades, the location of these pits is strictly limited. Local wear is the result of the decurrent produced by the flow around the inlet of the blade. In this case, the same particle may contact the worn surface more than once.
The diversion of solid-liquid mixture flow at impeller inlet is the reason for the increase of solids concentration at the rear cover plate and the decrease of concentration at the front cover plate. With the increase of pump flow rate, the non-uniform distribution of solid particles along the blade width increases and the number of particles at the back cover plate increases, which will lead to increased local wear. At the same time, the concentration of solid particles at the front cover decreases correspondingly, that is to say, the wear of the front cover decreases.
Parametric store VC/gD. It can be used as a criterion for evaluating the relative wear strength of front and rear cover plates.
According to Jandman's test data, the relationship between the maximum wear volume of the rear cover plate (82) and the maximum wear volume (8) of the front cover (8) and the factor JC1gD. is shown in Table 3 -7-5.
The wear of the cover does not affect the performance of the pump. When perforation occurs, the guard plate will be damaged.
From the above data, it can be seen that the front cover wears faster than the back cover when the JC/gDa value is small, that is, in the condition of small flow rate of the pump. On the contrary, when the parameter VC/gD. has a small value, the wear of the rear cover plate is the first cause. It should be noted that the wear of the rear cover plate of impeller is 1-2 times faster than that of the front cover plate in the larger flow rate state, while in the smaller flow rate state, the damage of the front cover is earlier than that of the back cover plate, which is due to the stronger discharge caused by the larger angle of attack of the back cover plate.

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