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Chemical pump to prevent leakage of sealing applications
Chemical pump leak-free is the eternal pursuit of chemical equipment, it is this requirement contributed to the growing use of magnetic pumps and shielded pumps. However, there is still a long way to go without leakage, such as the life span of the magnetic pump isolation sleeve and shielding pump shielding sleeve, the material pitting problem, the reliability of static sealing, and the like. Now some of the basic aspects of the seal is briefly described as follows: 1. Seal For the static seal, seal and seal are usually only two forms, and O-ring seal again the most widely used; medium viscosity of the pump Of the performance impact is great, when the viscosity increases, the pump head curve down, the best conditions of the head and flow are decreased, while the power is then increased, thus reducing efficiency. The parameters on the general sample are the performance when conveying water and should be converted when transporting viscous media. For the viscosity of the pulp, paste and viscous liquid delivery, it is recommended to use screw pump. 2. Sealing material Chemical pump static sealing materials generally use fluorine rubber, special circumstances only use PTFE material; mechanical seal ring static material configuration is more critical, not cemented carbide is the best on the cemented carbide, the price is high On the one hand, the hardness difference between the two is not reasonable, so it is best to distinguish between media characteristics. For the dynamic seal, the chemical pump seldom used packing seal, the main mechanical seal, mechanical seal and single-sided and double-ended, balanced and unbalanced type, balanced type for high pressure medium seal (usually refers to the pressure greater than 1.0MPa), double-end machine seal is mainly used for high temperature, easy crystallization, viscosity, containing particles and toxic volatile medium, double seal should be injected into the sealed chamber isolation liquid, the pressure is generally higher than the medium pressure 0.07 ~ 0.1 MPa.