Repair scheme of mechanical seal for kettle

Mechanical seal repair scheme for kettles With the requirements of production safety and environmental protection, the application of mechanical seals is becoming more and more extensive. At present, most of the rotating equipment of enterprises use mechanical seals to protect the leakage between the dynamic and static sealing surfaces, but mechanical seals are relatively precise components in the equipment, and the requirements for technicians in the process of operation and maintenance are compared. Gao, let me explain a few problems of mechanical seal repair. 1. The installation of mechanical seals The main reason for the quality of operation and the length of life of mechanical seals during use is that the equipment itself gives the working environment of mechanical seals. Therefore, it is necessary to carefully check the equipment before installing the mechanical seal, which will reduce the possibility of failure of the mechanical seal and improve the service life of the mechanical seal. The equipment needs to be checked in the following aspects: (1) The diameter and depth of the seal cavity It should be the same as the size on the installation drawing of the seal assembly, and the general tolerance is within ±0.13mm; the dimensional deviation between the shaft and the shaft sleeve should be within ±0.0.3-±0.05. The axial movement of the shaft needs to be checked, and the total movement theory can not exceed 0.25mm; the radial runout of the shaft is generally less than 0.05mm. Excessive radial runout may cause wear between the seal sleeve and the shaft; the self-checking leakage of the sealing surface increases, which affects the overall working environment of the seal and reduces the service life of the seal (2) Check the curvature of the shaft, and the maximum curvature Should be less than 0.07mm. (3) Check the alignment between the sealing cavity hole and the shaft, and the misalignment should be less than 0.13mm. Misalignment between the seal cavity hole and the shaft will affect the dynamic load between the seal faces, thereby reducing the seal operating life. 2. Check the seal before installation. Whether it is a new mechanical seal or a repaired mechanical if, it is necessary to carefully check the following items: check all parts, the parts should be clean and free of scale, especially the sealing surface; check the rotating parts, transmission pins and The spring pin master moves freely; check the set screws of the rotating parts. 3. The start-up operation and correct use of the mechanical seal are critical to the service life of the mechanical seal. Generally, the following precautions are used for trial use with most mechanical seals (1) Most mechanical seals are designed to work in a liquid environment, so The sealing surface must be immersed in the liquid before driving, and dry running may damage the sealing surface and affect the service life. Jogging equipment has little effect, but at full speed it is necessary to ensure that the sealing equipment is in the working fluid. (2) When turning on the cooling or flushing system, no matter whether the equipment is running or not, it is best not to cut off the cooling or flushing system, especially when the heat medium transported by the equipment will crystallize after cooling. (3) It is normal for the newly installed equipment to have a slight leakage at the first operation. With the running-in of the seal, the leakage will be reduced to no leakage.