Production and sealing of chemical pumps

Production and sealing of chemical pumps Leak-free is the eternal pursuit of chemical equipment. It is this requirement that has contributed to the expansion of the application of magnetic pumps and canned motor pump mechanical seals. However, there is still a long way to go to truly achieve no leakage, such as the life problems of magnetic pump isolation sleeves and shielding pump shielding sleeves, material pitting corrosion problems, static seal reliability problems, and so on. Now some basic information about the seal is briefly introduced as follows: 1. For static seals, there are usually only two types of seals and seals, and the O-ring is the most widely used seal; the viscosity of the medium affects the pump. The performance impact of the pump is great. When the viscosity increases, the head curve of the pump decreases, and the head and flow rate of the best working conditions decrease, while the rate of the mechanical seals increases, thus reducing the efficiency. Generally, the parameters on the sample are the performance when transporting clean water, and should be converted when transporting viscous media. For the transportation of high viscosity slurries, pastes and viscous liquids, screw pumps are recommended. 2. Sealing material Chemical pump static seal material is generally fluorine rubber, and PTFE material is used in special circumstances; the material configuration of mechanical seal dynamic and static ring is more critical. It is not that cemented carbide is the best to cemented carbide, and the price is high. On the one hand, it is unreasonable that there is no difference in hardness between the two, so it is best to treat them differently according to the characteristics of the medium. For dynamic seals, chemical pumps rarely use packing seals, mainly mechanical seals. Mechanical seals are divided into single-end and double-end, balanced and unbalanced types. The balanced type is suitable for the sealing of high-pressure media (usually the pressure is greater than 1.0MPa), the double-end machine seal is mainly used for high temperature, easy to crystallize, viscosity, particle-containing and toxic and volatile media. The double-end machine seal should inject isolating fluid into the sealed cavity, and its pressure is generally higher than the medium pressure by 0.07~0.1 MPa. Keywords: mechanical seals, mechanical seals