How To Solve These Three Common Problems In The Use Of Slurry Pumps?

Slurry pumps are common machinery that increases the energy of solid-liquid mixed media by the help of centrifugal force, and are mainly used in mining, metallurgy, construction and other fields.As a common practical auxiliary tool, there are three common problems during use of slurry pumps, namely unstable flow, cavitation, and seal failure, which leads to slurry leakage of slurry pumps. So how do you solve such problems? Let’s take a look at the following science! 1. How to solve the unstable flow of slurry pumps? There are roughly the following reasons for unstable flow of slurry pumps: 1. Air leakage of the suction pipe or bottom valve, or blockage of the water inlet, which is a common cause of insufficient flow.The air leakage source of the suction pipe and the bottom valve must be checked and blocked in time, or the silt or blockage at the water inlet must be cleaned.2. If the voltage is too low, the slurry pump speed will decrease, resulting in insufficient flow of the slurry pump. At this time, the power supply voltage should be checked and adjusted in time.3. If the pipeline leaks or there is air in the pump body, just discharge the air in the pipeline in time.4. Severe wear of the sealing ring or impeller will also lead to unstable flow of the slurry pump. The severely worn sealing ring and impeller should be checked and replaced in time.5. If the bottom valve enters the water depth, resulting in air entering during pumping. The bottom valve depth should be adjusted according to the suction range of the slurry pump.6. If the slurry pump works normally for a period of time, but then the current gradually drops and the flow rate is obviously insufficient, this problem still occurs after restarting and normal operation for a period of time. Most of the time is that slurry or other debris are accumulated in the suction tube, causing cavitation of the slurry pump. In severe cases, there will be a large noise in the slurry pump and the pump head vibrates significantly. At this time, the front pool and suction tube should be cleaned to reduce the length below the elbow, or the stirring device should be added to reduce the sedimentation of the slurry.2. How to solve the problem of cavitation in the slurry pump? At a certain temperature, when the liquid pressure drops below the saturated gas pressure, boiling gasification will occur. This is the characteristic of the liquid itself. At a certain temperature, the saturated gas pressure is constant and increases with the increase of temperature.For centrifugal pumps such as slurry pumps, reducing the suction inlet pressure can make the liquid suction into the pump. When the suction inlet pressure is lower than the saturated gas pressure corresponding to the water temperature, the inhaled liquid will undergo a gasification reaction.The bubbles formed by gasification gather in the low pressure position in the slurry pump, that is, the back of the blade above the impeller inlet. As the surrounding liquid goes outward, the impact of the liquid will cause noise and vibration, which will cause damage to the impeller after a long time.Generally speaking, the measures to solve the cavitation phenomenon are: 1. Control the suction liquid level pressure to prevent the liquid level pressure from being too low.2. Control the flow rate of the suction inlet so that the slurry pump can work under the specified amount of beat.3. Appropriately reduce the installation height of the slurry pump.4. The suction valve is fully open and the filter is cleaned frequently.3. How to solve the failure of slurry pump seal? In different operating stages, the causes of failure of slurry pump seal are different. Next, we will analyze them one by one.1. Leakage of slurry pump during assembly　　The slurry pump is prone to problems during installation. Generally, it is necessary to observe whether the slurry pump is leaking through static pressure tests. The leakage volume is small. There are problems with the dynamic ring or static ring sealing ring during small shifts. If the leakage volume is large, there are problems with the friction pairs of the dynamic and static rings.Leakage media is sprayed axially, which is mostly a problem with the dynamic ring sealing ring. If the leakage media is sprayed around or leaked from the water cooling port, most of the problems are caused by the static ring sealing ring. At this time, you should observe carefully, determine the problem and make timely adjustments.2. Leakage during the trial operation of the slurry pump. After the static pressure test, the cause of the leakage of the slurry pump is generally caused by damage to the friction pair of the dynamic and static rings.There are many reasons for this phenomenon, generally: axial forces caused by abnormal phenomena such as cavitation, evacuation, and pressure hold, excessive compression during installation of seals, excessive tight or loose ring seals of the dynamic ring or static ring seals, and particles entering the friction pairs in the working medium.The main solution is to redisassemble and replace the seal.3. Sudden leakage during normal operation of the slurry pump　　In this case, a few are caused by normal wear or the slurry pump reaches its service life, but most are caused by changes in working conditions or improper operation and maintenance.The main reasons are: evacuation cavitation or long-term pressure holding, actual output is too small, sealed cooling water interrupted, long-term shutdown and restarting without turning, increasing corrosion, polymeric or gelatinous substances in the medium, violent changes in the working environment of the slurry pump, frequent adjustment of working conditions, etc.When using the slurry pump, you need to pay attention to the usage specifications. The shaft sealing must be turned on before use. The pump can be shut down for five minutes before shutting down. When the pump is shut down for a long time, you need to clean the pump chamber and machine seal with clean water before shutting down. Manually turn on the slurry pump when restarting to extend the service life of the slurry pump.Above we have summarized some common problems during the use of slurry pumps. In order to avoid problems during use, the use process of slurry pumps should be standardized and checked regularly. In case of abnormal situations, the cause should be identified and adjusted in time can be ensured to ensure the normal use of the equipment and the normal operation of the factory selection.