Technical requirements for mechanical seals during installation2

Technical requirements for mechanical seals during installation The mechanical seal is a high-precision mechanical component, and its correct installation and operation have a great impact on its service life. We generally follow the standards of the Ministry of Petrochemical Industry. The technical requirements for the cooperation part of the pump and the mechanical seal installed with the mechanical seal are as follows: 1. Shaft curvature: not more than 0.05 mm; 2. Rotor vibration: the proximity of the shaft sleeve at the moving ring seal ring is not more than 0.06 mm; 3. The axial movement of the shaft is not allowed to exceed ±0.5 mm. If there is a shaft sleeve, the shaft sleeve is not allowed to be loose; 4. The alignment error of the coupling: for the gear coupling, it is not more than 0.08 ~ 0.10 mm (P2008C) , for the elastic coupling is not more than 0.05 ~ 0.06 mm; (customary practice end jump<0.05, radial jump<0.10) 5. The concentricity tolerance of the gland (static ring seat) and the seal cooperating stop to the shaft center line is 0.05 mm, and the perpendicularity value of the plane contacting the gasket to the center line is 0.03 ~ 0.05 mm, if it reaches If the requirements are not met, the sealing cavity should be processed; 6. The end of the shaft sleeve of the movable ring seal of the device and the end of the gland (or shell) of the static ring of the device should be chamfered and smoothed. 1. Be careful when installing and disassembling the mechanical seal. It is forbidden to use a hand hammer and a flat shovel to avoid damage to the sealing element. If the scale cannot be disassembled, it should be cleaned and then disassembled. 2. If mechanical seals are used at both ends of the pump, take care of each other during assembly and disassembly to avoid being stretched. 3. For the mechanical seal that has been used, if the gland is loose and the seal moves, the dynamic and static ring parts must be replaced, and should not be re-tightened for continued use. Because the working track of the conflicting copy will change after loosening, the sealing of the contact surface is easily damaged.