Screw pump is the use of screw rotation to suction and discharge liquid, due to the mutual engagement of the screw and screw with the inner wall of the liner in close cooperation between the suction and discharge of the pump will be separated into one or more sealed space . As the screw is rotated and engaged, these sealed spaces are constantly formed at the suction side of the pump, sealing the liquid in the suction chamber therein and continuously displacing in the axial direction of the screw from the suction chamber to the discharge end to be closed in the respective spaces Continued discharge of liquid, like a nut in the screw rotation is constantly moving forward, as the case, which is the basic working principle of the screw pump. When the screw pump is working, the liquid is sucked into the sealed space enclosed by the screw thread and the pump shell. When the driving screw rotates, the screw pump sealing volume increases the pressure of the screw pump under the extrusion of the screw thread and moves along the axial direction. Since the screw is rotating at a constant speed, the flow of liquid out is also uniform. Through the screw pump sleeve locking analysis of the media and the speed of the sleeve gap requirements, put forward to solve the shaft sleeve lock the rectification program. Proved by practice, after transformation of the equipment operating parameters are all normal. Analysis of the reasons: According to the work of sliding bearings, the general bushing hole and the shaft with the clearance fit, the size of the parts on the shaft diameter and bushing aperture size deviation, usually at an average operating temperature of 20 ℃ to ensure that the shaft and bushing hole With a reasonable change in the gap determined. Affect the sliding bearing overheating failure of many factors in the bearing structure design is reasonable, the material used in the right circumstances, the main bearing overheating is the radial clearance size of the improper assembly and improper use caused. Radial clearance of sliding bearings on the bearing overheating failure, the radial clearance of the sliding bearing is the difference between the diameter of the bearing hole and the journal diameter, the sliding bearing to leave a certain radial clearance, its role is as follows: is to achieve the shaft and bearing activity The minimum conditions for the connection; is to ensure the accuracy of the operation of the shaft; is an important condition for the formation of liquid lubrication. Therefore, the radial clearance of plain bearings is very important, too large or too small are extremely harmful. The gap is too small, it is difficult to form a lubricating film, the friction heat is not easy to be taken away, the bearing overheating, serious will hold the shaft; gap is too large, the oil film is difficult to form, will reduce the machine's operating accuracy, will produce severe vibration and noise, Lead to tile accident.