I. Single-stage single-suction cantilever centrifugal pump structure 1) The chemical pump is a single-stage single-suction centrifugal pump , pump casing is 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, overhauling more convenient.
3) The impeller is equipped with 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 elasticity and elasticity and seal the pressure of the liquid to achieve the purpose of sealing.
2. Repair procedure Disassemble the coupling to remove the intermediate short section - Review and motor center - Loosen the volute and bracket bolts - Separate the volute from the pump body - Remove the impeller - Remove the sealing cap and separate the 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 into 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 the coupling is disassembled, and 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.
Four. Rolling bearing inspection 1) Check the drain pump bearing lubricant, dip a little finger oil, first check the status of oil, and then rub each other with thumb and index finger, check the oil for hard impurities if there is a description of the bearing Bad.
2) Check the cage is complete, the location is correct, the activities are free from If the cage damage can not be repaired, you should replace the new bearing.
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.
Five. Rolling bearing clearance measurement Rolling movement gap means; if a set of rings (inner or outer ring) is fixed, the other ring along the radial or axial maximum amount of activity. 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 a dial gauge measuring the value of the outer ring (axial and radial to)
Can be seen from the table commonly used single row radial ball bearings, radial clearance of 0.01 ~ 0.04mm, while the axial clearance of radial clearance value of 7 to 12 times. Roller bearing clearance than ball bearing clearance big.
Can be seen from the table commonly used single row radial ball bearings, radial clearance of 0.01 ~ 0.04mm, while the axial clearance of radial clearance value of 7 to 12 times. Roller bearing clearance than ball bearing clearance big.
Six. Rolling bearing damage Rolling bearing damage in two cases; First, the bearing has reached the life limit and wear and tear scrap; Second, due to poor quality maintenance, improper maintenance, resulting in premature damage. At present, most of the bearing damage is premature damage, the main reason is as follows;
1) poor installation, shaft centerline skew, causing the raceway surface local stress, rapid rolling raceway and rolling body.
2) The assembly of hard particles fall into the bearing, raceway distortion, when rolling through, resulting in raceway crush and metal spalling.
3) Poor lubrication. Including; lack of oil, oil emulsion and so on.
4) bearing inner ring and shaft interference is too small, resulting in inner ring and shaft wear.
5) there is a gap between bearing outer ring and bearing body, causing wear between outer ring and bearing body.
Seven fixed shaft head preparation method of impeller impeller shaft head cap size of the lock, directly affect the stability of the pump after maintenance operation, if the preparation of the cap tightness, the pump running for a period of time reserve cap loose, will cause the pump vibration, impeller Wear and other accidents, spare cap fastening force is too large, will damage the spindle thread. Therefore, the tight cap must be appropriate when tight, the first molybdenum disulfide coated in a spare cap, with 300? Long sleeve wrench to exert a certain force locking. Lock the lock washer onto the spare cap.
Eight. Spare cap and shaft biting deadbolt Spare shaft preparation is the preparation of hat cap and shaft biting death phenomenon may be because the screw into the debris or thread slight burr, can not take the hard nut rotation method. First of all, should be in the thread with bolt loosening agent, and then use a copper rod to beat the outer edge of the hat, the loosening agent? Into the spindle screw, whipped while rotating spare hat. If you use this method can not solve the problem. You can only choose to destroy the spare hat method, destroy the spare hat has the following two methods;
1) Use the torch to cut the symmetrical position of the spare cap. When cutting the nut, it is required that the spline of the spindle can not be bruised.
2) cut the hat will be prepared on both sides of cutting, cutting must be carefully observed cutting, different bump spindle screw. Then use flat 錾 will prepare the hat tick. Check the spindle for damage, if damaged, the screw should be repaired.
Nine. Efficacy Center Method Center for the correct installation of special tools for verification center work, the required circle less than or equal to 0.04 ?. The face is less than or equal to 0.04 ?. (Except for special requirements).
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