Slurry pump is a common machine which increases the energy of solid liquid mixed medium by centrifugal force. It is mainly used in mining, metallurgy, construction and other fields. As a common practical AIDS, slurry pump in the process of use there are three common problems, that is, flow instability, cavitation, seal failure, resulting in slurry pump leakage problem, so encounter such problems how do you solve it? Now let's do science!
One, slurry pump flow instability how to solve?
The reasons for the unstable flow of slurry pump are as follows:
1, water suction pipe or bottom valve leakage, or the inlet is blocked, this is a common cause of insufficient flow. It is necessary to check the air leakage source of the suction pipe and bottom valve and plug it in time, or to clean up the silt or blockage at the inlet.
2. If the voltage is too low, the speed of slurry pump will decrease, resulting in insufficient flow of slurry pump. At this time, check the power voltage and adjust it timely.
3. If there is air leakage in the pipeline or in the pump body, timely discharge the air in the pipeline.
4. Serious wear of the sealing ring or impeller will also lead to unstable flow of slurry pump. The sealing ring and impeller with serious wear should be timely checked and replaced.
5, the bottom valve into the water depth is insufficient, resulting in air entering when pumping, should be adjusted according to the slurry pump suction distance bottom valve depth.
6, if the slurry pump start work over a period of time, gradually decline, but after the current flow, restart the normal operation after a period of time still appear this kind of problem, mostly due to slurry or other sundries are suction tube, resulting in slurry pump cavitation, serious in the slurry pump will made a big noise and vibration pump head is so obvious, at this time should be thoroughly cleaned up before and suction pipe, reducing elbow length under, or increase the mixing device to reduce the slurry settlement.
Two, slurry pump cavitation phenomenon how to solve?
At a certain temperature, when the liquid pressure falls below the saturated pressure, boiling gasification will occur. This is the characteristic of the liquid itself. At a certain temperature, the saturated pressure is fixed and increases with the increase of temperature.
For slurry pump such centrifugal pump, reduce the inlet pressure to make the liquid suction pump, when the inlet pressure is lower than the water temperature corresponding to the saturated pressure, the liquid will be inhaled gasification reaction. The bubbles formed by gasification converge at the lowest pressure position in the slurry pump, namely the back of the blade above the impeller inlet. As the surrounding liquid moves outward, the impact of the liquid will cause noise and vibration, which will cause erosion damage to the impeller in the long run.
Generally speaking, measures to solve cavitation phenomenon include:
1. Control the suction level pressure to prevent the level pressure from being too low.
2. Control the flow rate of suction inlet to make the slurry pump work under the specified volume.
3. Appropriately reduce the installation height of slurry pump.
4, suction valve open enough, and often clean the filter.
Three, slurry pump seal failure how to solve?
In different operating stages, the reasons for seal failure of slurry pump are different. Next, we will analyze one by one.
1. Slurry pump leakage during assembly
Slurry pump in the installation process is prone to problems, generally need to observe the slurry pump leakage through static pressure test, leakage amount is small, small shift moving ring or static ring sealing ring problems, if the leakage amount is large, it is the dynamic, static ring friction pair problems. Leakage media along the axial injection, most of the moving ring seal ring problem, if the leakage media to spray around or leakage from the water cooling mouth, most of the static ring seal ring problems, at this time should be carefully observed, determine the problem and timely adjustment.
2. Leakage during slurry pump test run
After the static pressure test, the leakage of slurry pump is generally caused by the damage of friction pair of dynamic and static rings. Causes of this phenomenon are many, generally: cavitation, pumping, pressure and other abnormal phenomena caused by the axial force, the installation of sealing compression amount is too large, moving ring seal ring or static ring seal ring too tight or too loose, there are particles in the working medium into the friction pair and other reasons. The main solution is to reassemble and replace the seal.
3. Sudden leakage during normal operation of slurry pump
This situation, a small number of normal wear and tear or slurry pump to reach the service life caused by, but most of the working conditions change or operation, maintenance caused by improper. The main reasons are as follows: pumping cavitation or holding pressure for a long time, the actual output is too small, the sealing cooling water is interrupted, the operation is stopped for a long time and no turning is resumed, corrosive substances in the medium, the increase of agglomerating or cementing substances, the temperature in the working environment of the slurry pump changes sharply, the working conditions are adjusted frequently, etc. In the process of using slurry pump, it is necessary to pay attention to the use specifications. Before use, the shaft sealing water must be connected, and the pump can only be closed after stopping for five minutes. In the case of a long period of shutdown, the pump cavity and seal need to be cleaned with clean water before the shutdown.
Above, we have summarized some common problems in the use of slurry pump. In order to avoid problems in the use of slurry pump, we should standardize the use process of slurry pump, check it regularly, find out the cause of abnormal situation and make timely adjustments, so as to ensure the normal use of equipment and the normal operation of the selection plant.