Extend the service life of mechanical seal what method
1 transverse slot: high pressure and high speed machine to maintain liquid film between the friction surface is difficult, the liquid film is often high pressure and high speed friction heat generated.
In this case, the slot form taken to strengthen the lubrication is very effective.
Ring and static ring can be slotted, typically in the wear-resisting material.
Ring and static ring should not be at the same time slot, because that would reduce the lubrication effect.
In order to make the dirt or abrasive dust as far as possible not to enter the friction surface, the liquid flow in the centrifugal force direction for (
Flow of sealing, slot should be open in the static ring, in order to avoid the effect of centrifugal force to the introduction of the dirt friction surface.
On the other hand, the liquid to reverse direction of the centrifugal force (
Flow, slot should be open on the ring, the centrifugal force will help dirt from slot.
Low friction surface open slot are rectangular, wedge, or other shape.
Trough shoulds not be too much or too deep, otherwise it will increase the leakage.
2 pressure lubrication: so-called hydrostatic lubrication is there will be pressure lubricating liquid directly into the friction surface to have the effect of lubrication.
Introduced lubricating liquid liquid by a separate source supply, such as hydraulic pump, etc.
With the pressure of lubricant and the fluid pressure inside the mechanical counter, this form is usually referred to as hydrostatic pressure seal.
The gas medium mechanical seal measures should be taken to establish a gas film lubrication, such as using gas static pressure controlled membrane mechanical seal or solid lubrication, namely choose self lubricating materials as a dynamic or static ring.
As long as conditions permit, should as far as possible put the gas medium conditions into liquid medium, so convenient for lubrication and seal.
3 surface eccentric: general mechanical seal, the center of the center of the ring and static ring and the shaft centerline are on a straight line, if the one of dynamic or static ring ring made with transverse center shaft centerline offset distance, can make the ring rotates continuously into the lubricant to the lubrication between the sliding surface.
It should be noted is that eccentric size not too big, especially for high pressure, eccentric pressure can make face uneven, and cause uneven wear.
For high speed seal, unfavorable use ring as eccentric ring, or due to centrifugal force balance will result in vibration of machine.