渣浆泵载体参数对叶片磨损的影响

    载体密度和黏度变化对叶轮叶片磨损影响叙述如下。当液体密度增大时，落在入口边表面上的颗粒数量减少，即磨损下降。此外，这时颗粒在叶片之问流道内的水力粗度(即沉降速度)减少，因此在叶片工作表面上的浓度也减少，这就会导致叶片表面磨损下降。在黏度增加时，在其他条件相同时，雷诺数下降，迎面阻力系数增大，因此磨损下降。
    上述结论只对水力磨蚀性磨损有代表性，而不适合于浸蚀和汽蚀所产生的磨损。应该考虑到由于汽蚀和浸蚀使叶轮零件损坏比水力磨蚀性磨损小得多，只在输送轻磨蚀固液混合物的情况下，可能对泵零件寿命有影响。
    根据泵叶片尺寸和结构，对确定的工作状态一泵最佳或者接近最佳状态，即对最佳流量Q或者接近最佳流量进行了叶轮叶片磨损特征和强度的分析。输送磨蚀性固液混合物泵运行实践表明，在泵工作状态变化时，叶轮特别是叶轮入口段的磨损特征和强度变化

明显。

在相应加速度场内，固体颗粒运动特点和沉降速度，与载体介质中颗粒移动状态即与雷诺数有关。较大雷诺数表征颗粒运动的自模状态。这时颗粒运动阻力与其运动速度的二次方有关，迎面阻力系数C是常数值。较小雷诺数表征在固体颗粒运动状态下运动阻力不是速度的二次方函数，颗粒迎面阻力系数是变化的。
    在自模状态下，将有最大的颗粒迎面阻力，也就是说在这种情况下，向心加速度相同时，在叶轮入口运动的颗粒沉降速度小于颗粒运动阻力与其速度小于二次方成正比的非自模状态时的沉降速度。在相同加速度场时，较大颗粒以比小颗粒较大的速度运动，较大颗粒的雷诺数相应地大些。这就表明，大颗粒迎面阻力系数小于小颗粒阻力系数，即可以认为迎面阻力系数C间接地表征颗粒的粗度。
    B. r.詹德曼假定固体颗粒在叶轮叶片入口的浓度重新分布强度用Co JC/gD参数表征(式中，Co、D。为液体入口速度和叶轮入口直径)。
    固体颗粒分布不均匀度表征入口边磨损不均匀性，可以用下列方法加以评价。平均线性磨损等于叶片磨损表面面积与其沿着入口边的宽度之比。磨损不均匀性可以假定为叶片最大线性磨损量与其平均值之比。如果叶片边磨损是均匀的，那么叶片磨损表面将出现矩形形状，平均磨损等于最大值，即它们比值等于1;如果磨损表面为三角形，那么入口边磨损不均匀性等于2.
    詹德曼提出假定，由上述方法确定的磨损不均勾性是参数? JC1sD.的函数。这个假定可以概括试验研究资料。表3 7 3列出叶片边磨损不均匀性 Kn与参数比C/ED.之间的关系。
    从这些数据中可以看出，参数活JE/gD。的增大，导致叶片入口边较小的均句磨损。渣浆泵厂家

Effect of Slurry Pump Carrier Parameters on Blade Wear

The influence of carrier density and viscosity on the wear of impeller blades is described below. When the liquid density increases, the number of particles falling on the surface of the entrance decreases, that is, wear decreases. In addition, the hydraulic roughness (i.e. settling velocity) of particles in the runner between the blades decreases, so the concentration on the working surface of the blade decreases, which will lead to the decrease of the wear on the blade surface. When the viscosity increases, the Reynolds number decreases and the resistance coefficient increases under the same other conditions, so the wear decreases.

The above conclusions are representative of hydraulic abrasive wear, but not suitable for erosion and cavitation wear. It should be considered that the damage of impeller parts caused by cavitation and erosion is much less than that caused by hydraulic abrasion. It may affect the service life of pump parts only when conveying light abrasion solid-liquid mixture.

According to the size and structure of pump blades, the wear characteristics and strength of impeller blades are analyzed for the optimal or near optimal state of a pump, i.e. the optimal flow rate Q or near the optimal flow rate. The operation practice of the pump for conveying abrasive solid-liquid mixture shows that the wear characteristics and strength of impeller, especially the inlet section of impeller, change with the working state of the pump.

Obvious.

In the corresponding acceleration field, the movement characteristics and settling speed of solid particles are related to the particle movement state in the carrier medium, i.e. Reynolds number. The larger Reynolds number indicates the self-model state of particle motion. At this time, the particle motion resistance is related to the quadratic of its velocity, and the head-on drag coefficient C is a constant value. The smaller Reynolds number indicates that the moving resistance of solid particles is not a quadratic function of velocity, and the resistance coefficient of particles is variable.

In the self-model state, there will be the maximum particle head-on resistance, that is to say, in this case, when the centripetal acceleration is the same, the particle settlement velocity in the impeller inlet motion is less than that in the non-self-model state where the particle movement resistance is proportional to its velocity less than the quadratic square. At the same acceleration field, the larger particles move at a larger velocity than the smaller particles, and the Reynolds number of the larger particles is correspondingly larger. This shows that the resistance coefficient of large particles is smaller than that of small particles, that is to say, the resistance coefficient C indirectly represents the coarseness of particles.

B. R. Jendman assumed that the redistribution strength of solid particles at the inlet of impeller blades was characterized by Co JC/gD parameters (formulas, Co, D). For liquid inlet velocity and impeller inlet diameter.

The inhomogeneity of solid particle distribution represents the inhomogeneity of wear at the entrance, which can be evaluated by the following methods. The average linear wear is equal to the ratio of the wear surface area of the blade to its width along the inlet edge. The wear inhomogeneity can be assumed to be the ratio of the maximum linear wear of the blade to its average value. If the blade edge wear is uniform, then the wear surface of the blade will appear rectangular shape, the average wear is equal to the maximum value, that is, their ratio is equal to 1; if the wear surface is triangular, the wear inhomogeneity of the inlet edge is equal to 2.

Janderman proposed the assumption that the wear nonuniformity determined by the above method is a function of parameter JC1sD. This assumption can summarize the experimental data. Table 373 shows the relationship between Kn and C/ED.

From these data, we can see that the parameters are live JE/gD. The increase of the blade size leads to the smaller wear of the blade entrance. Slurry Pump Manufacturer