Mechanical seal requirements and installation

Mechanical seal requirements and installation

(1) The use of mechanical seals (1) Pay attention to the rotation direction of the mechanical seal, whether the coupling is centered, whether the lubricating oil in the bearing parts is properly added, and whether the piping is correct. (2) Before the operation of the mechanical seal, first open the medium and cooling mechanical seal water valve, check whether the gas in the seal cavity is fully discharged, and prevent leakage caused by the static mechanical shaft seal pressure, and then start the operation. (3) Whether the mechanical seal works normally and stably after driving, whether there is abnormal torque of the mechanical seal caused by the rotation of the shaft, as well as abnormal noise and overheating. (4) When the temperature of the conveying medium of the mechanical seal is too high, too low, or contains impurity particles, flammable, explosive or toxic, corresponding measures such as blocking, flushing, cooling, and filtration must be taken. (5) Before the mechanical seal is running, turn it by hand, pay attention to whether the torque is too large, whether there is friction and abnormal sound. (2) The installation and installation method of the mechanical seal varies with the type of mechanical seal and the type of machine, but the installation methods of the mechanical seal are almost the same. The installation steps and precautions of the mechanical seal are as follows: (1) The mechanical seal is installed Before cleaning, the shaft (shaft sleeve) and gland should be free of burrs, and the bearing should be in good condition; the seals, shaft, sealing cavity and gland should be cleaned. In order to reduce frictional resistance, the part where the mechanical seal is installed on the shaft should be coated with a thin layer of oil for lubrication. Considering the compatibility of rubber O-rings, if oil is not suitable, soapy water can be applied. The structure of floating static ring without anti-rotation pin should not be oiled, and should be installed in the gland dry. (2) Install the static ring of the mechanical seal together with the gland on the shaft, being careful not to collide with the shaft, and then install the moving ring assembly. The set screw of the spring seat or transmission seat should be evenly tightened several times. Before the gland is not fixed, push the compensation ring by hand for axial compression. After loosening, the compensation ring can automatically spring back without jamming, and then the gland bolts are evenly locked. (3) Determination of the installation size of the mechanical seal When installing the mechanical seal, the installation size of the mechanical seal should be guaranteed according to the product instruction manual or sample.

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