Mechanical seal use precautions-2
4. There is no reasonable setting for the auxiliary flushing system or the auxiliary flushing system. The auxiliary flushing system for mechanical seals is essential. It can effectively protect the sealing surface and cool, lubricate and wash away debris. However, sometimes the designer does not properly configure the auxiliary flushing system to achieve the sealing effect; sometimes, although the designer designs the auxiliary system, the flow rate and pressure of the flushing fluid are insufficient due to impurities in the flushing fluid, and the design of the flushing port is unreasonable. Also, the sealing effect is not achieved.
Fifth, the cause of pump cavitation. Due to the unreasonable operation of the system and the poor cavitation performance of the pump inlet, and the high speed of the pump, local cavitation occurs at the inlet of the pump. After the cavitation occurs, there will be bubbles in the water, which will impact the mechanical sealing surface on the one hand. The outer surface causes damage to the surface; on the other hand, a flowing film of the matching surface of the static and dynamic ring also contains bubbles, which cannot form a stable
Sixth, the machining accuracy is not enough. The machining accuracy is not enough for many reasons. Some of them have insufficient machining precision of the mechanical seal itself. The reason for this is easy to attract people's attention and easy to find. However, sometimes the processing precision of other parts of the pump is not enough, and the reason for this is not easy to attract people's attention. For example, the pump shaft, the bushing, the pump body, and the sealing cavity have insufficient precision. The presence of these causes is very detrimental to the sealing effect of the mechanical seal.