Shop Best Carbon Slurry Pump in CNSME PUMP

The wear-resistant slurry pump delivers a mixture of solid particles and water containing residue.But in principle, a slurry pump is a centrifugal pump, which is mainly used for the slurry transport of converter dust removal water, blast furnace gas washing water, continuous cast turbid circulating water, and rolled steel turbid circulating water systems.After cavitation occurs in the slurry pump runner component, how to deal with it to prevent similar phenomena from happening again?We need to start with the accessories of the slurry pump to avoid the occurrence of cavitation of the slurry pump!　　　　1. Use a double-suction impeller.2. Increase the import area of \u200b\u200bthe impeller.3. Increase the width of the blade import edge.4. Increase the radius of curvature at the turning of the front and rear covers of the impeller.5. The water inlet of the blade extends to the water-absorbing side.6. The impeller uses cavitation-resistant materials.7. Setting of the front inducer.For existing wear-resistant slurry pumps, measures to prevent cavitation are as follows.1. The cross-sectional change rate of the runner should be as small as possible, and the wall surface should be as smooth as possible.2. Reduce the geometric water absorption height hg (or increase the geometric pouring height).3. In order to reduce water absorption loss, try to increase the pipe diameter and minimize the length of the pipe, elbows and accessories. 4. Prevent long-term operation under large flow.5. At the same speed and flow rate, a double suction pump is used. Due to the reduced inlet flow rate, the pump is not prone to cavitation.6. When the pump is cavitated, the flow rate should be reduced or the speed should be reduced for operation.7. The condition of the water-absorbing bottom shell of the wear-resistant slurry pump has an important impact on the cavitation of the pump.8. For pumps operating under harsh conditions, cavitation-resistant materials can be used to avoid cavitation damage.

Five methods to regulate the flow of the slurry pump: 1. Exit throttling flow regulation This is one of the more common flow regulation methods.Closed some valves of any form on the outlet pipe will add a system pressure head, so the system pressure head curve will intersect the slurry pump pressure head curve at a small flow rate.The throttling at the outlet moves the operating point to a lower efficiency point and there is a power loss at the throttle valve.Throttled to the dead point may cause liquid in the pump to overheat, bypasses may be used to maintain the necessary minimum flow rate, or different adjustment devices may be used.2. Adjust the throttling flow rate at the suction inlet.Then some power can be saved by throttling in the suction pipe.Since outlet throttling will cause liquid to overheat or vaporize, jet engine fuel slurry pumps often use inlet throttling.At small flow rates, the impellers of these pumps are only partially filled with liquid.Therefore, when the outlet is throttling, the flow rate of the condensate pump with an input power and temperature rise of about 1/30 of the full operating position of the impeller is usually controlled by the immersion depth, which is equivalent to the inlet throttling.This particular design can reduce cavitation damage from these pumps to a minor extent, but the energy levels also become quite low.　　　　3. Adjust bypass adjustment　　　All or part of the flow can be diverted from the discharge pipeline of the slurry pump and directed to the suction port of the pump or other suitable points through the bypass pipe.One or more flow orifices and suitable control valves may be installed in the bypass.Metering bypass is usually used to reduce the flow of the boiler feed pump, mainly to prevent overheating.A considerable power saving can be saved if the excess flow of the bypass propeller pump is used instead of the outlet throttle.4. Speed \u200b\u200badjustment of flow rate adjustment　　　　　　　　　　　When adjusting the flow rate in this way, the required power can be reduced and overheating can be eliminated during the flow rate adjustment process.Steam turbines and internal combustion engines can easily adapt to speed adjustment at a very small additional cost.Various mechanical, magnetic, hydraulic transmissions, as well as DC and AC variable speed motors can be used to adjust the speed.Usually, variable speed motors are too expensive and can only be adjusted with adjustable blades when they have been proven to be worth it in special circumstances.After studying the adjustable guide vanes installed in front of the impeller, it was found that this method is effective in adjusting the pump at a specific speed of 5700 (2.086).The blades can produce forward pre-rotation, thereby reducing the indentation head, flow rate and efficiency.However, relatively small adjustment effects can be achieved only through the blades.With the constant change of the indenter and relatively small efficiency loss, a larger flow rate variation range can be obtained.5. Flow regulation and gas replenishment　　　　　　　　　　　　　　　　Supplying air to the suction port of the slurry pump is also a method to regulate the flow rate. Throttled flow can save some power compared to the outlet.Generally speaking, air is not desired in the conveyed liquid. Too much air is always at risk of causing the pump to lose the filling head, so this method is rarely used in practice except in a few occasions.

1. Motor heat or overcurrent

1. Model selection and design issues

Inspection items: The actual flow of the pump is greater than the design flow;

Troubleshooting measures: Reduce the flow of the pump (reduce the speed or replace the impeller with a smaller diameter, calculated according to the slurry pump impeller cutting theory).

Inspection items: The motor power is small or the slurry density is large;

Troubleshooting measures: Replace with a high-power motor.

2. Assembly, installation and use problems

Inspection items: mechanical friction between the impeller and the guard plate of the slurry pump;

Troubleshooting measures: adjust the gap and eliminate friction;

Inspection items: bearing damage;

Troubleshooting measures: replace the bearing;

Inspection items: friction between the gland or water seal ring and the sleeve at the shaft seal, or the packing is pressed too tightly;

Troubleshooting measures: overcome friction and adjust the tightness of the packing pressure;

Inspection items: the rotating shafts of the pump, coupling and motor are not concentric;

Troubleshooting measures: adjust the coaxiality of the rotating shaft of the pump and motor;

Inspection items: damage to the elastic rubber pad of the coupling;

Troubleshooting measures: replace the elastic pad.

2. The pump does not produce water or the output is insufficient
1. Device system problems

Inspection items: air inlet at the suction pipe or pump inlet flange;

Troubleshooting measures: overcome air inlet factors;

Inspection items: no shaft seal water or air inlet at the shaft seal;

Troubleshooting measures: add shaft seal water to overcome air inlet factors;

Inspection items: the outlet valve is not closed before starting or the outlet valve of the slurry pump is opened too quickly;

Troubleshooting measures: operate according to the slurry pump starting procedures;

Inspection items: the suction port of the slurry pump is blocked;

Troubleshooting measures: clear the blockage;

Inspection items: vacuum tank leaks or The size of the vacuum tank is unreasonable;

Troubleshooting measures: overcome the air intake factor or improve the size of the vacuum tank, please call Shijiazhuang Ruite Pump Industry for inquiries

2. Calculation problem of slurry pump selection

Inspection items: pump head is lower than the pipeline device head;

Troubleshooting measures: improve the pump head to match the pipeline;

Inspection items: pipeline cavitation margin is less than the required cavitation margin of the pump;

Troubleshooting measures: modify the pipeline device system to increase the pipeline cavitation margin or replace the pump with a cavitation performance that meets the pipeline requirements;

Inspection items: the slurry concentration is large and the selected pump is small;

Troubleshooting measures: replace Large-diameter slurry pump;

III. Short life of slurry pump

1. Slurry pump selection problem

Inspection items: Slurry pump head is higher than pipeline head;

Troubleshooting measures: Reduce pump head to match pipeline;

Inspection items: Slurry pump operates under cavitation state;

Troubleshooting measures: Increase the liquid level of the feed tank to increase the cavitation margin of the pipeline system;

Inspection items: The speed of the selected pump is too high or the pump is small;

Troubleshooting measures: Use a low-speed high-head pump or replace a large-diameter pump;

Inspection items: The single-stage head of the selected pump is too high;

Troubleshooting measures: Change to a series pump ;

Inspection items: The material of the slurry pump flow parts does not match the slurry characteristics;

Troubleshooting measures: Replace the flow parts materials that match the slurry;

2. Slurry pump manufacturing problems

Inspection items: The service life of the slurry pump flow parts varies;

Troubleshooting measures: Replace the flow parts with stable quality;

Inspection items: The slurry pump flow parts have local defects;

Troubleshooting measures: Replace qualified flow parts;

Inspection items: There are other quality problems such as cracking;

Troubleshooting measures: If there is this problem, it is generally a production quality problem, and you can ask the slurry pump manufacturer for a return or replacement.

3. Problems with the use of slurry pumps

Inspection items: Operation in the vacuum state;

Troubleshooting measures: Stabilize the pump flow or use the pump outlet valve to stabilize the pump flow;

Inspection items: Using the pump inlet valve to adjust the flow causes the pump to operate in the cavitation state;

Troubleshooting measures: Open the inlet valve and use the pump outlet to adjust the flow;

Inspection items: Unstable slurry concentration and particle size;

Troubleshooting measures: Control stable slurry characteristics;

Inspection items: Foreign matter entering the pump causes pump damage;

Troubleshooting measures: Use a grille to control foreign matter from entering the pump;

Inspection items: Reverse rotation to start the pump causes the impeller to fall off and damage the pump;

Troubleshooting measures: Reverse rotation is strictly prohibited.

4. Slurry pump vibration and noise
1. Slurry pump selection issues

Inspection items: Pump head is higher than pipeline head, causing pump evacuation;

Troubleshooting measures: Adjust the pump head to match the pipeline head;

Inspection items: Pump runs in cavitation state;

Troubleshooting measures: Increase pipeline cavitation margin or replace pump with good cavitation performance;

2. Slurry pump installation and use issues

Troubleshooting measures: The pump foundation is not firm or the pipeline installation and support are not firm;

Inspection items: Reinforce and install firmly;

Inspection items: Pump, coupler, motor shaft are not concentric;

Troubleshooting measures: Adjust the coaxiality of the pump coupler rotating shaft to the requirements;

Inspection item: Damage to the elastic pad of the coupling;

Troubleshooting: Replace the elastic pad;

Inspection item: The static imbalance of the impeller, coupling, and groove wheel exceeds the standard;

Troubleshooting: Redo the static balance;

Inspection item: Improper installation of the groove wheel;

Troubleshooting: Adjust the two shafts of the pump motor to be parallel, and the groove wheel of the pump motor to be centered;

Inspection item: Foreign matter blocks the impeller;

Troubleshooting: Eliminate foreign matter;

Inspection item: Using the pump inlet valve to adjust the flow causes pump cavitation;

Troubleshooting: Open the inlet valve and use the pump outlet valve to adjust the flow;

Inspection item: Bearing damage;

Troubleshooting: Replace the bearing.

5. Leakage
1. Slurry pump packing seal

Inspection items: No seal water or low seal water pressure;

Troubleshooting measures: Add seal water to ensure seal water pressure and water volume;

Inspection items: The seal water contains abrasive solid particles;

Troubleshooting measures: The seal water should be clean water at room temperature;

Inspection items: Packing installation is unqualified or maintenance is not timely;

Troubleshooting measures: Reinstall or replace according to requirements;

Inspection items: Slurry pump sleeve wear;

Troubleshooting measures: Replace the sleeve;

Inspection items: Slurry pump packing is too hard or too soft;

Troubleshooting measures: Generally, oil-immersed asbestos packing is commonly used;

2. Slurry pump mechanical seal

Inspection items: Seal box installation Not perpendicular to the center line of the pump shaft;

Troubleshooting: Reinstall to the requirements;

Inspection items: Flush water was not added as required;

Troubleshooting: Add flush water as required to maintain water pressure;

Inspection items: Mechanical seal design or structure is not suitable for slurry pump;

Troubleshooting: Replace the mechanical seal that meets the operating requirements of the slurry pump;

3. Slurry pump auxiliary impeller shaft seal

Inspection items: High pump inlet pressure;

Troubleshooting: Generally, when using auxiliary impeller shaft seal, the pump inlet pressure should be less than 0.1 times the pump head H;

Inspection items: The gap between the slurry pump impeller and the rear guard plate is too large;

Troubleshooting: Adjust the pump impeller axial clearance to the requirements;

Inspection items: Pump start and stop Frequent, solids precipitate into the sealing box, causing premature leakage of the sealing box;

Troubleshooting measures: transport clean water before stopping to completely discharge the slurry out of the pipeline or rinse the sealing box with clean water before starting;

VI. Slurry pump bearing heat and oil leakage
1. Slurry pump bearing part

Inspection items: single-row tapered bearing assembly slurry pump, bearing clearance is too small;

Troubleshooting measures: adjust the bearing clearance;

Inspection items: improper grease addition or improper amount of grease added;

Troubleshooting measures: grease-lubricated bearing assemblies should generally be added with lithium-based grease;

Inspection items: pump, coupling, motor rotating shafts are not concentric;

Troubleshooting measures: re-adjust the coaxiality of the pump, coupling, and motor to the requirements;

Inspection items: coupling Loss of elastic pad of the device;

Troubleshooting measures: Replace with new elastic pad;

Inspection items: Damage to the bearing retainer of the slurry pump (generally because the quality of the slurry pump bearing does not meet the standards);

Troubleshooting measures: Replace with new bearings from regular manufacturers;

Inspection items: The lubricating oil is too dirty;

Troubleshooting measures: Replace with clean lubricating oil;

2. Oil leakage

Inspection items: Too much oil;

Troubleshooting measures: Add oil according to the specified position of the oil mark;

Inspection items: The return oil area is too small or blocked;

Troubleshooting measures: Increase the flow area of ​​the return oil and remove the blocking factors;

Inspection items: Unreasonable design or unqualified manufacturing and installation;

Troubleshooting measures: Change the design structure and improve the quality of manufacturing and installation.

VII. Slurry pump transmission part
1. Short life of V-belt

Inspection items: The slurry pump runs at a large flow rate, exceeding the power that the V-belt can transmit;

Troubleshooting measures: Adjust the pump flow rate to the flow rate specified in the contract;

Inspection items: The pump motor groove wheel is not installed correctly;

Troubleshooting measures: Adjust the pump motor to parallel the two shafts and align the two wheels;

Inspection items: V-belt slippage;

Troubleshooting measures: Tighten the V-belt until it does not slip;

Inspection items: The lengths of the V-belts are uneven and vary greatly;

Troubleshooting measures: Replace the length of the V-belts and use them in groups.

2. Coupling (direct drive)

Inspection items: Short life of elastic rubber pads;

Troubleshooting measures: Adjust the two shafts of the pump motor to be coaxial, adjust the flow rate to the contract value, and replace the new elastic rubber pads;

The above content is a summary of common faults and solutions of slurry pumps for you. I hope that you can find out the faults on the spot as soon as possible when you encounter problems when using slurry pumps. If you still cannot solve the problem, please contact the slurry pump manufacturer as soon as possible.