1. The installation of the pump and the use of the relationship between
The test results show that all pump shaft bending pump, the installation of the verticality. If the upper end of the pump tilts, graphite PTFE bearing will be on the corner first generation of wear and tear, the stainless steel sleeve and graphite PTFE bearing in normal working state. With the bearing wear intensifies, the gap between the sleeve and the bearing is gradually increasing, so the cantilever pump shaft at the lower end of the produce deflection, this is the center of gravity of the impeller has and liquid pump shaft of the rotary center coincides. No matter how good the original design of the static balance, but also will have a greater imbalance of inertia force. FY type liquid pump speed is generally 2900rmin, it may be generated by the inertia force is very large. When the unbalance force exceeds the weight of the rotor, bearing the occurrence of strong motion will wear. And by bearing wear caused by unbalanced inertia force generated, and unbalance inertia force increased and increased the bearing wear, this vicious cycle will become more and more serious. When the unbalanced force is increased to a certain value, the "cantilever" will be placed in the pump shaft bending. So the difference of pump shaft sag is the root cause of its bending. The original structure of pump shaft was pipe cladding, is difficult to measure the verticality. The solution is in the vertical support tube at limit in 0.1mm, the actual use can avoid shaft bending. We will increase the accuracy of the installation, such failures in different environments significantly reduced.
2. Graphite PTFE bearing
As mentioned above, if the installation of the pump shaft tilt slightly, cylindrical bearing will soon wear. But if the bearing change is a spherical surface shaped structure, then regardless of the installation of the pump axis is tilted, convex spherical bearing of the concave spherical surface and the shaft sleeve will always uniform contact, wear uniform, this will greatly extend the service life of PTFE bearing and the pump installation requirements decreased, relaxed to 1mm even though squareness of pipe support value, also won't happen pump shaft bending phenomena. Also must be pointed out that, in order to facilitate the installation should be in the graphite PTFE bearing hole mounting sleeve with the gap, the length should be slightly larger than the ball sleeve diameter and width should be slightly larger than the sleeve length, the convex shape of the sleeve along into concave shape of the bearing.
