In the use of some equipment, the medium will leak through the gap, which will have some influence on the normal use and use effect of the equipment. In order to avoid this kind of problem, a shaft sealing device to prevent leakage is needed. This device is our mechanical seal. What principle does it use to achieve the sealing effect?
The working principle of the mechanical seal: It is a shaft sealing device that relies on one or several pairs of end faces that are perpendicular to the shaft for relative sliding under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, and is equipped with auxiliary sealing to achieve leakage prevention. .
Common mechanical seal structure is composed of stationary ring (static ring), rotating ring (moving ring), spring seat of elastic element, set screw, auxiliary sealing ring of rotating ring and auxiliary sealing ring of stationary ring, etc. The anti-rotation pin is fixed on the gland To prevent the stationary ring from rotating.
"Rotating ring and stationary ring can also be called compensation ring or non-compensating ring according to whether they have axial compensation capability."
For example, centrifugal pumps, centrifuges, reactors, compressors and other equipment, because the drive shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment, and the medium in the equipment leaks out through the gap. If the pressure inside the equipment Below atmospheric pressure, air leaks into the equipment, so there must be a shaft sealing device to prevent leakage.