1. Countermeasures against bad behavior
O-rings are first used for chemical mechanical seal, which have good wear resistance and rubber elasticity, can still maintain their inherent shape and size when slightly damaged, and continue to maintain the sealing effect. The O-rings generally used for sealing are mostly rubber or polytetrafluoroethylene. PTFE mainly has a corrosive effect and can be used as a corrugated gasket or V-shaped pipe. If it is under high temperature or low temperature conditions, stainless steel and other bellows are generally used as the sealing ring. If a rotating mechanical seal is required, the seal ring should slide to seal.
We can consider a static mechanical seal with a long service life, the static ring is installed on one side of the shaft, and the dynamic ring is installed on one side of the housing, so as not to affect the equipment due to mechanical deformation, and maintain a flat structure. At the same time, the spring of this installation method does not contact the sealing liquid, and the action is well improved, which provides great convenience in the process of removing the slurry and maintaining the flatness and machine precision of the seal. Chemical heat has a great influence on chemical mechanical seal. Heating can cause material denaturation and part deformation, resulting in changes in load capacity, which can greatly reduce seal performance and burn. The treatment method needs to be determined by the size of the heat, such as natural cooling, inner circulation cooling, outer flushing cooling and inner circulation cooling, etc., and the temperature of the sealing is controlled to achieve the best sealing effect.
2. Countermeasures against sliding surfaces
In terms of equipment maintenance and maintenance, carefully check the equipment for wear and slip marks to ensure the accuracy of the static ring surface. At the same time, the use of static mechanical seals can solve the problem of wear and tear very well. Another method to solve the thermal deformation of the seal due to the change of the material stress of the sliding part is to change the retaining method of the O-ring or the graphite ring of the sealing ring from the sliding form to the plug-in type.
3. Countermeasures to prevent dry sliding
If the sliding surface is damaged due to insufficient cooling during sliding and heating, we can choose to configure better sealing fluid, cooling water and temperature control unit. At the same time, we also need to check the supply pipes to prevent blockages. When choosing a chemical mechanical seal, it is best to use a static mechanical seal with good pulp resistance to better prevent dry friction. In addition, maintaining the integrity and normal operation of machinery is very important for strengthening the operation management of rotating machinery, checking parameters and states such as mechanical seal pressure in a timely manner, and solving related problems in a timely manner.
To sum up, the leakage of chemical mechanical seal is a very important problem, which is directly related to the safety of the entire chemical production. Once leakage occurs, it is likely to cause major accidents. Therefore, on the issue of mechanical seals, we need to focus on exploring and researching better maintenance and prevention policies.
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