What causes water pump shaft wear?
A water pump is a machine that transports liquid or pressurizes liquid. It transmits the mechanical energy of the prime mover or other external energy to the liquid, so that the liquid energy is increased, and is mainly used to transport liquids including water, oil, acid and alkali liquids, emulsions, suspension emulsions and liquid metals. Pumps in the long-term operation process, there will often be pump shaft wear problems. Comprehensive analysis, pump shaft wear is caused by the following reasons:
1. when assembling the bearings, the bearing inner ring and the main shaft lack of sufficient interference or no interference;
2. the pump rotor and motor rotor centering deviation is too large, the operation process produces excessive vibration, aggravate the bearing wear or even generate the phenomenon of hysteresis resulting in wear shaft;
3. Compared with mechanical seals, traditional packing seals have poor wear resistance and short service life, once the amount of water leakage from the shaft seal increases, the water retaining ring fails to block the water, resulting in water ingress into the bearing chamber, leading to damage to the bearings;
4. bearing oil shortage, oil seal failure, inhalation of foreign matter caused by bearing stagnation, impurities in the lubricating oil leading to a sharp rise in temperature caused by high temperature sintering.
When we encounter the pump shaft wear problem, how should we solve it? What are the repair techniques?
When the pump shaft wear problems, the traditional solution is to fill welding or brush plating after machining repair, but both have certain disadvantages: fill welding high temperature thermal stress can not be eliminated, easy to cause damage to the material, resulting in bending or fracture of the parts; and brush plating by the thickness of the coating is limited, easy to flake, and the above two methods are metal repair metal, can not change the "hard-to-hard", "hard-to-hard", "hard-to-hard", "hard-to-hard", "hard-to-hard", "hard-to-hard", "hard-to-hard". "Hard to hard" relationship, in the combined effect of the forces, will still cause wear again.
Sole carbon nanopolymer materials to repair the pump shaft wear the advantages of high bond strength, good mechanical properties, corrosion resistance, easy to mold, can be processed, and the technology is similar to a cold welding technology, on-line repair process will not produce high temperature, to avoid the impact of the thermal stress of the filler weld, and the repair process is not subject to the limitations of the shaft of a single side of the amount of wear. In addition, the material itself has the pressure resistance, bending resistance, ductility and other comprehensive advantages, can effectively absorb the impact of external forces, greatly dissolve and offset the radial impact of the bearing on the shaft, and to avoid the possibility of gap, to avoid the equipment due to the gap increase caused by the relative motion of the wear and tear, to avoid the possibility of wear again.
Water pump shaft wear repair case:
An enterprise water pump shaft support side, positioning side bearing position wear problems, wear size of 108.5mm, wear depth of radial 1.5mm, bearing type 6322, equipment speed of 1400/min, equipment operating temperature of 65 ℃. Sole technology to repair the water pump shaft wear process is as follows:
1. Measure shaft wear on site;
2. surface treatment: use oxygen acetylene to bake the surface oil, moisture, make the surface dry. Then polish the surface to remove the oxidized layer, the surface to achieve a rough and clean state, and use anhydrous ethanol to clean. 3.
3. Wipe SD7000 mold releasing agent on the inner surface of the tooling, then mix and blend the Soray carbon nanopolymer material according to the ratio, and apply the material evenly to the repair surface, the thickness of the coating is greater than the depth of abrasion;
4. Install the tooling and allow the material to cure;
5. After curing, remove the tooling, remove excess material from the surface and check the dimensions of the repair;
6. After checking the dimensions, reinstall the bearing and complete the repair.
