Basic forms of mechanical seals
Thread Content
This post was last edited by Black gold on 2010-8-10 at 16:19. The most commonly used shaft end seal for ordinary centrifugal pumps is a mechanical seal. 1. Basic structure: A mechanical seal consists of two sealing elements that fit together on smooth and straight surfaces perpendicular to the axis, and they rotate relative to each other to create a seal. Primary seals——moving ring and stationary ring; Auxiliary seals——sealing rings and gaskets; Compression elements——springs, push rings, etc.; Transmission elements——assembly sleeves, transmission pins (or keys), etc. 2. Flushing and cooling of mechanical seals: Mechanical seals rely on the friction surfaces between the moving and stationary rings as their primary sealing surfaces. Friction occurs at these surfaces, generating frictional heat; in addition, heat from the medium and some heat from the main shaft also contribute to raising the temperature of these friction pairs. An increase in temperature can have adverse effects on mechanical seals. (1) The viscosity of the liquid film between the friction surfaces decreases, leading to vaporization and thus dry friction operation. (2) The liquid film between the friction surfaces deteriorates. (3) The corrosiveness of the fluid increases. (4) The sealing rings or gaskets age, decompose, or soften. (5) The vapor pressure of the fluid between the friction surfaces rises, resulting in leaks. (6) The friction pairs undergo thermal deformation
Mechanical seal 1 Definition: A device that prevents fluid leakage, consisting of at least one pair of end faces perpendicular to the axis of rotation, which remain in close contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, along with the assistance of auxiliary seals. 2 Features: The axial seal, which is prone to leakage, is replaced with a static seal that is less likely to leak, as well as a dynamic seal based on radial contact at the end faces.
Could we discuss flushing and cooling in detail?