Inspection method of BA pump single stage single suction centrifugal pump

First, the single-stage single-suction cantilever centrifugal pump structure 1) The chemical pump is a single-stage single suction centrifugal pump, pump casing for the volute type. Axial suction radial discharge, the pump shell as the center support type, the connection of the pump housing and the base with transverse connection sliding pin expansion system, thus ensuring the pump after thermal expansion of the neutral. 2) pump shell as the center support type, do not have to remove the flange of the entrances and exits when overhauling, more convenient for maintenance. 3) Impeller with a wear ring, impeller wear, only replace the wear ring, reducing the cost of overhauling. In addition there is a balance hole in the impeller, you can automatically balance the axial thrust. 4) self-priming pump shaft supported by the rolling bearings, the use of shrink-fitting method (or heating method) to ball bearings and roller bearings fitted to the shaft. 5) shaft seal for the mechanical seal, by the elastic and elastic seal and liquid pressure to achieve the purpose of sealing. Second, the maintenance process decomposition coupling Remove the intermediate short section - Review and motor center - Loosen the volute and bracket bolts - Volute and pump separation - Remove the impeller - Remove the seal cover Separate gland - Pull out the mechanical seal shaft Cover - Remove the sealing cap - Remove the coupling - Pull the shaft and bearing out of the counter-pulley - Remove the bearing from the shaft. Third, the overhaul process 1, multi-stage pump mechanical seal installation (1) moving ring assembly; the spring follower ring into the stopper, the ring fitted with a seal ring embedded in the stopper, the ring should be coated A small amount of grease embedded in the moving ring of the stopper, the flange of which should be closely fitted with the stopper, fit the assembled stopper into the sleeve, measure the distance, and then fix the screw shaft Set in the groove, to prevent loose, and press the moving ring sealing surface 2-3 times, confirm the dynamic follow-up performance is good. (2) static ring assembly. Place the washer (sealant ring) in the stationary ring in the correct direction. Install the stationary ring into the sealing cap after the outer circumference of the washer and the seal cap are evenly coated with a small amount of grease. In this case, confirm that the positioning pin position. (3) mechanical seal assembly. Apply a little grease on the sealing surface of the static and dynamic seal rings and put the sealing cap and static ring together in the main shaft. Pay attention to the "0" ring when installed. When done, check that the pin fits into the groove of the stationary ring and that the stationary ring is beveled in. 2. Coupling disassembly method Because the coupling and the shaft cooperate with the interference fit, the coupling must be heated when disassembling the coupling. The heating temperature should not exceed 200 ℃. Demolition of the coupling, the hammer can not be directly struck, but should pad copper rod, and should hit the coupling hub and can not directly hit the outer edge of the coupling, because here easily broken. The ideal solution is to use a dedicated tool. (4) Rolling bearing inspection 1) Check the oil in the drain pump bearing, dip a little finger oil, first check the condition of oil, and then use your thumb and forefinger to rub each other to check whether there are hard impurities in the oil. If there is a description of the bearing to bad. 2) Check the cage is complete, the location is correct, the activities are free. If the cage damage can not be repaired, the new bearings should be replaced. 3) Check the rotation of the rolling bearing. Insert your finger into the hole and rotate the bearing, then let it decelerate and stop gradually. A good bearing should rotate steadily with a slight turning noise, but no vibration. If the bearing is poor, noise and vibration will occur when rotating. Slow down gradually, but suddenly stopped. 4) rolling body and raceway surface can not have spots, holes, dents, peeling, peeling and so on. (5) Rolling bearing clearance measurement Rolling motion play means that if a ferrule (inner ring or outer ring) is fixed, the other ferrule has a maximum radial or axial amount of motion. Due to the different bearing status, the clearance is divided into the original clearance, with clearance and work clearance. Original clearance refers to the bearing clearance before installation free state; with the clearance is the bearing installed on the shaft and the equipment after the clearance, due to interference with the relationship between the clearance is always less than the original clearance; Work clearance refers to the bearing in the working state of the actual clearance, under normal circumstances, work clearance greater than with the clearance. The clearance measurement method is: Radial clearance can be measured with feeler gauge or rolling under the ball once to measure the thickness; the inner ring can also be fixed, with the dial gauge measuring the value of the outer ring (axial and radial Ball bearing radial clearance (mm) Table Bearing diameter (mm) Radial clearance New ball bearings New column Bearing limit 20 ~ 30 35 ~ 50 55 ~ 80 85 ~ 120 130 ~ 150. 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