News Digest:What are the wear principle of dredge pump impeller, dredge pump for sale, sand pump parts, china do pump. Dredge pump impeller is also named as sand pump impeller, dredging pump impeller, on board dredge pump impeller, submersible sand pump impeller, lad
What are the wear principle of dredge pump impeller
Dredge pump impeller is also named as sand pump impeller, dredging pump impeller, on board dredge pump impeller, submersible sand pump impeller, ladder pump impeller, booster pump impeller. The impeller is the heart to the sand dredge pump, therefore, what are the wear principle of dredge pump impeller takes an important role of pump study.
To understand the wear principle of the dredge pump impeller, we need to understand the change of the trajectory of the sand after entering the dredge pump impeller.
We know that when the sand solid flows into the impeller, the direction of movement of the solid particles in the sand slurry will change from axial to radial;
Under the action of centrifugal force, most of the solid particles will move to the periphery, and the concentration of solid particles will also produce a new distribution, resulting in the wear of the impeller rear cover being much larger than that of the front cover, especially the inlet side of the blade. The wear at the intersection with the rear cover is more serious.
Due to the different solid particle sizes entering the dredge pump, the inertia forces of those small solid particles are correspondingly smaller;
Of course, the wear life of the dredge pump has a lot to do with the design of the dredge pump.
First, the impact of small solid particles wear
When a small solid particle enters the pump body, it has a certain pre-spin similar to the liquid particle, and the steering of the solid particle is the same as the steering of the impeller, so the small solid particle does not have a large impact velocity on the inlet edge of the blade. The wear and tear is not great.
In the pump body, the small solid particles have a small centrifugal force, so in the flow channel, its movement trajectory always adheres to the blade working surface;
The motion curvature of the particles is also not much different from the circumferential curvature of the blade.
When solid particles flow out of the channel opening, the radial velocity and flow angle of the small solid particles are small;
Therefore, when the dredge pump is working, the blade working face and the outlet side of the dredge pump will be subject to the wear of solid small particles, and it can be known through observation that the wear on the outlet side is more serious.
Classification, material and structure classification of dredge pump impeller
Second, the impact of large solid particles
Large solid particles have a greater inertial force. When those solid particles enter the pump body, they do not have a pre-spin similar to the liquid particle. Under the action of rotation, they will impinge on the inlet side of the blade at various angles of attack. So that most of the particles collide with the inlet edge, so that a part of the solid particles are squeezed to the back of the blade.
Similarly, when large particles enter the pump body, large solid particles will leave the blade working surface due to large centrifugal force;
The curvature of the particle motion is also naturally different from the circumferential curvature of the blade. They cause a more intense impact on the blade. When the particle reaches the blade exit, the large solid particle also has a large radial velocity. At the same time, it has a large flow angle;
It can be seen that the large solid particles cause severe wear on the pump body, causing severe wear from the blade inlet to the blade outlet. Moreover, since some solid particles are squeezed to the back of the blade, the back surface of the blade is also caused to some extent. abrasion.
Through experiments, we can find that the wear tendency of solid particles on the blade is that the wear position is close to the trailing edge of the blade from the leading edge of the blade, and it will cause great wear at the trailing edge, which is more serious than the leading edge.
In addition, the working face of the blade is more severely worn than the back of the blade due to the friction and impact of the particles.
There are many types of dredge pumps, and the impellers of each dredge pump product are not the same, but the wear mechanism is almost the same.
The middle and late wear of the dredge pump impeller
In the operation of the dredge pump, the disk of the dredge pump is also subject to wear, and the most severely worn place occurs between the working face of the blade and the back of the blade;
At the same time, the intersection of the working face of the blade and the wheel is also a serious wear place. After continuous wear, the wheel will have a long groove, and the groove will also be formed at the intersection of the back of the blade and the wheel, but The degree of wear is not as severe as the former, and the impeller wear changes as shown in the figure above.
The experimental results show that, in terms of wear time, when the wear time is about 3/7 of the total wear time, the wear of the dredge pump impeller is about 63.8% of the total wear, which has exceeded the total wear. 1/2.
When the wear time is about 2/7 of the total wear time, the wear rate of the impeller reaches the highest, which means that the impeller will wear the fastest at this stage. As the wear increases, it will directly affect the lift of the dredge pump.
Better known What are the wear principle of dredge pump impeller, contact dredge pump for sale - China Do Pump at info@dopumogroup.com or call us at +8615031104888.
