What are the requirements for the sealing rings of mechanical seals?
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Sealing rings refer to the dynamic ring and the static ring collectively (the same below), and they are the main components that make up a mechanical seal. The sealing ring plays a significant role in determining the performance and lifespan of mechanical seals; therefore, certain requirements are placed on it. 1) It has sufficient strength and stiffness. It should not be damaged under operating conditions (such as pressure, temperature, and sliding speed), the deformation should be kept as minimal as possible, and it must maintain its sealing properties even when these operating conditions change. 2) The sealed end face should have sufficient hardness and corrosion resistance to ensure a satisfactory service life under operating conditions. 3) The sealing ring should have good heat shock resistance. To this end, the material is required to have a high thermal conductivity and a low linear expansion coefficient, so as not to crack under thermal shock. 4) The sealing ring should have a low friction coefficient and good self-lubricating properties; in addition, the material of the sealing ring must exhibit good wettability with the sealing fluid. Short-term dry friction during operation does not damage the sealing surface. 5) The sealing ring should be as simple and symmetrical as possible, with a monolithic structure being preferred. Combination-type (such as inlaid) sealing rings can also be used, and spray-type structures on the sealing end face should be avoided as much as possible. 6) The sealing ring should be easy to manufacture, convenient to install and maintain, and inexpensive.
The requirements for the sealing ring of a mechanical seal are as follows: 1) It must possess sufficient strength and stiffness: under operating conditions such as pressure, temperature, and sliding speed, the sealing ring should not be damaged, should deform as little as possible, and should still maintain good sealing performance even when these operating conditions change. 2) Good hardness and corrosion resistance: To ensure a long service life under operating conditions, the sealing surface must have sufficient hardness and the ability to resist corrosion. 3) Good heat shock resistance: The material needs to have a high thermal conductivity and a low coefficient of linear expansion, so that it does not crack easily when subjected to heat shock. 4) Low friction coefficient and good self-lubricating properties: The material of the sealing ring should have good wettability with the sealing fluid. The sealing end face cannot be damaged even under short-term dry friction. 5) Simple and symmetrical structural design: The sealing ring should preferably have an integral structure; a modular structure (such as an inlaid type) can also be used, but sealing end-face structures of the spray-type should be avoided as much as possible. 6) Easy to process, install, and maintain, with low costs: The production of sealing rings as well as their routine maintenance should be straightforward processes, and the associated costs should be relatively low. The above are some basic requirements for mechanical seal rings, in order to ensure the performance of the mechanical seal and extend its service life. .