Screw pump shaft sleeve lock reason and solution

Screw pump shaft sleeve lock reason and solution - 2019 09 - 19 screw pump is a unique way to construct the positive displacement pump, mainly by the drive motor and speed reducer, connecting shaft rod and connecting rod box, stator and rotor parts. Analysis by screw pump shaft sleeve, holding in death of the medium and the rotation speed of shaft sleeve clearance requirements, puts forward the solution to the shaft sleeve lock improvement scheme. A screw pump, the analysis of the causes of shaft sleeve lock according to the performance of the sliding bearing, the general bushing hole and shaft is clearance fit, the diameter of axle parts graph and the bushing aperture size deviation, are generally according to the average temperature of 20 ℃ ensure reasonable clearance between shaft and bushing hole change and uncertain. Many factors affect the sliding bearing overheating fault in bearing structure design is reasonable, the materials to choose the right circumstances, the size of the sliding bearing overheating mainly bearing radial clearance improper assembly and improper use. Sliding bearing radial clearance of bearing overheating fault, the influence of radial clearance of sliding bearing & Delta; Is the difference between the axis neck diameter and the diameter of bearing hole, sliding bearing should have certain radial clearance, its action is as follows: is the realization of shaft and bearing activity join at least conditions; Is the assurance of running accuracy control shaft; Is the important condition of formation fluid lubrication. Sliding bearing radial clearance, therefore, very important, too big or too small are extremely harmful. Gap is too small, it is difficult to form oil film, friction heat is not easy to be taken away, the bearing temperature, serious when 'holding shaft; Clearance is too large, the oil film also difficult to form, can reduce the running accuracy of machine can produce violent vibration and noise, and even lead to the tile burning failure. Bearing the actual use process, because the gap is too small, friction heat is not easy to be taken away, and lubricating oil as medium residue, impurity is more, easy entry clearance, bearing overheating, serious when 'holding shaft, a tile burning phenomenon. Second, the shaft sleeve, holding in death of the prevention and improvement measures in order to prevent bearing overheating fault, if the large radial clearance, & Delta; = 0. 03ｍｍ。 When the bearing vice although it can work normally, but greatly shorten its service life, therefore when determining bearing radial clearance, should guarantee the bearing on the premise of normal work leave less as far as possible. After the bearing assembly, first of all should be in accordance with the running-in test run specifications in terms of the good and the test run, then gradually loading speed, the shaft and bearing with surface bulge smooth, and then put into normal operation. Otherwise, even if the gap is not small, but try not to get up to speed after because assembly operation, and put into normal operation, which can lead to bearing overheating or even burning. To this, the sliding bearing radial clearance should be controlled in 0. 10毫米~ 0。 15ｍｍ。 Sliding bearing radial clearance of bearing overheating and life influence is very big, so for the radial clearance, must be strictly controlled in a reasonable range. In determining the bearing radial clearance, should fully consider factors that affect the radial clearance, besides considering shaft diameter, rotational speed, load and the precision of the machine, also should consider the following: a> , bearing materials. Bearing material is different, different expansion coefficient, clearance is different also. ｂ> And roughness on the surface of the shaft and bearing. ｃ> , journal and bearing geometry and mutual position error ( Namely, roundness, cylindricity, alignment, etc. ) 。 ｄ> And the bearing temperature. ｆ> , a sudden change in the starting conditions.