Axial flow pump packing seal mechanism

Axial flow pump packing seal mechanism
     When the packing is loaded into the packing chamber, it is axially compressed by the gland. When the shaft and the packing have relative movement, the radial force is generated by the plasticity of the packing and is in close contact with the shaft. At the same time, the impregnated lubricant in the filler is extruded to form an oil film between the contact surfaces. As the contact state is not particularly uniform, the contact area will be "border lubrication" state, known as the "bearing effect"; and not contact the concave to form a small oil tank, a thick oil film, contact parts and non-contact parts together Rules of the maze, from the role of preventing leakage of liquid flow, which is called "maze effect". This is the mechanism of packing. Obviously, a good seal is to maintain the "bearing effect" and "maze effect". That is to say, to maintain good lubrication and proper compression. If the lubrication is bad, or pressure too tight will make the oil film interruption, resulting in dry friction between the filler and the shaft, and finally lead to burning shaft and serious wear and tear.