How mechanical seals work! What are the technical requirements

How mechanical seals work! What are the technical requirements?

Mechanical seals are shaft seals for rotating machinery. The drive shaft passes through the inside and outside of the equipment, so there is a circumferential gap between the shaft and the equipment. The medium in the device leaks out through the gap. If the pressure inside the device is below atmospheric pressure, air will leak into the device and must be stopped. Shaft seal leaks, this time you need a mechanical seal to keep the fluid in place to prevent fluid leakage! Mechanical seal parts are relatively precise parts, usually consisting of a stationary ring, a rotating ring, a spring element, a spring seat, and a rotating assist Composition of the sealing ring. First, there is sufficient strength and stiffness: it will not be damaged under working conditions such as pressure, temperature and bone velocity, the deformation should be as small as possible, and the sealing condition can be maintained when the working conditions fluctuate. That is, the sealing end face of the housing must have sufficient strength and certain corrosion resistance to ensure a satisfactory service life of the product. Second, it has good thermal shock ability: Therefore, the material is required to have high thermal conductivity and small linear expansion coefficient, and will not crack when subjected to thermal shock. Third, the smaller the friction coefficient: the sealing ring accessories should have a smaller friction coefficient Fourth, good self-lubricating If friction occurs for a short time during the working process, the sealing face will not be damaged. Therefore, the sealing ring should have good self-lubricating properties, and the material and sealing fluid of the sealing ring should have good full lubricating properties. Fifth, mechanical seal, its structure is simple The structure of the sealing ring should be simple and symmetrical. It is preferred to use an integral structure or a combined (eg mounted) sealing ring to avoid the use of a sealed face spray structure. Sixth, the sealing ring should be easy to manufacture and manufacture. The mechanical seal is easy to install and maintain, and the price is low.