In the general friction pair of the mechanical part of the slurry pump, the normal wear process is roughly divided into three stages:
1.Run-in phase.
2.Normal wear and tear phase.
3.Severe wear phase.
After a certain run-in phase, the surface gradually smooths out, the wear rate slows down, and gradually transitions to the normal stable wear stage. Abrasion during the break-in phase is a favorable abrasion process. The normal wear stage belongs to the stable wear process of the normal operation of the machine, and the amount of wear is relatively stable at this time. In order to ensure that the parts have a high service life, various effective measures should be taken to reduce the wear rate of the parts at this stage as much as possible and strive to extend their uptime. Normal wear and tear reaches a certain time, or due to accidental external factors, the size of the parts changes greatly, and the surface quality of the material deteriorates, so that the amount of wear increases greatly, so that the parts quickly fail or break. There are many factors that affect wear, and the main factors are abrasive hardness, particle size and shape, speed, etc.
It has a certain plasticity, and can produce a certain radial force under the action of compressive force, which is in close contact with the shaft.
It has sufficient chemical stability, does not pollute the medium, the packing material is not swollen by the medium, the impregnating agent in the packing is not dissolved by the medium, and the packing itself does not corrode the sealing surface.
Good self-lubricating performance, wear resistance, low friction coefficient.
When there is a small amount of eccentricity in the shaft, the packing should have sufficient floating elasticity.
It is easy to make and easy to fill.