Submersible slurry pumps utilize centrifugal force to generate pressure. The main medium transported by these pumps is a mixture of solid particles (including slag) and water, hence the name “submersible slurry pump.” The impeller is a semi-open type, with agitator blades extending from the impeller suction side.
Applications of Submersible Slurry Pumps: Widely used in petroleum, chemical, power, metallurgy, mineral processing, coal, and building materials industries to transport slurries formed by mixing solid particles and water.
Proper Installation of Submersible Slurry Pumps:
1. Install the double-row bearing onto the pump shaft, followed by the bearing spacer and the inner ring of the upper bearing.
2. Install the pump shaft containing the bearing into the bearing housing, and install the bearing sealing cap and water baffle ring.
3. Install the upper bearing, bearing cap, bearing sleeve, and locking nut in sequence.
4. Adjust the bearing clearance: Adjust the shaft to the lower end of the bearing housing until it cannot be adjusted further. Fix one nut, leave the other nut loose, and use a pry bar and dial indicator to adjust the axial clearance, generally to 0.015–0.025 mm. Then, tighten the nut and install the pump coupling. (Retains the instructional, imperative tone.)
5. Install and secure the connecting pipe, mounting plate, rear cover, impeller, pump body, elbow, and outlet pipe. Note: The clearance between the impeller and the front end of the pump casing should be 2–2.5 mm.
6. Install the motor mount and the motor with electrical connection.
Inspection and Maintenance of Submersible Slurry Pumps:
1. Observe whether the pump’s installation foundation is stable and whether all bolts are tightened.
2. Check whether the pump’s axial clearance has been adjusted correctly.
3. Fill the oil gauge with calcium-based grease.
4. Check whether the motor’s rotation direction is correct.
5. Start the motor, open the pressure gauge cock, and when the pump is operating at full speed, adjust the gate valve opening to the required range.
6. When the pump stops working, first stop the motor, then close the pressure gauge cock.
7. If the pump is to be stopped for a long period of time, disassemble the pump, clean it, apply anti-rust oil, and store it properly.
8. Within the first month of operation, or after 100 hours of operation, the grease in the motor support oil cup should be replaced. Thereafter, replace it every 2000 hours of operation.
9. After 6 hours of pump operation, check the mechanical seal and repair or replace it according to the degree of wear; otherwise, damage to the pump shaft and bearings will occur.
