How to remove the impeller of large circulating water pump?
The rotor of the pump is composed of an impeller, a shaft, a flat key, a left and right locating sleeve and a threaded sleeve. Although the impeller and shaft fit for clearance (phi 165D/d), due to the impeller and shaft matching, large surface (181335mm2), the impeller, hole, shaft and key shape error, resulting in the demolition of the impeller more difficult. At the same time, because the rotor runs longer, the gap between the positioning sleeve and the shaft has been corroded and dirt deposition medium filling plug die, location alone can not remove the cover, only with the impeller removed together, thus increased the difficulty of removing the impeller. In view of the rotor structural characteristics and actual use, we have adopted the "top pressure method" and "temperature difference method" and the "demolition" program, and achieved good results. The demolition of the basic process is: firstly, the rotor is placed in a mould disassembly, the impeller is fixed, and then put pressure on the top axis, while the impeller hub is heated expansion, the axial force from the impeller and the hole. 2 removing die design according to the rotor structure and stress analysis, considering the bearing ability and stability, mold production difficulty, with No. 16 steel mould frame welded to the bottom frame above the thick Q235 steel plate reinforcement 8 = 20, push-pull structure for two top force beam the activities of the 14 materials for heavy rail
In the demolition, the rotor on the tire and then put in the beam entrance surface of the impeller, the jack on the top of the pressure shaft, the rotor vertically upward, the fixed beam when the beam and the mold upper frame on both sides of the contact, it serves to limit the upward movement of the role of the impeller. As the rotor jack under the press, when the pressure exceeds the combination between the impeller and shaft resistance, will make the impeller and shaft to slip off until.
Abstract: the rotor of circulating water pump has large structure, local shape and position errors, and the disassembly of impeller is difficult. This paper introduces the structure and characteristics of the special mold disassembling method. 1 overview of our company circulating water pump is produced by the Changsha water pump factory single-stage double suction centrifugal pump, model 32SHA - 10, medium for the production of ammonia and urea production with recycled water
