Bearing material and structure for slurry pump

When the shaft rotates, the low temperature liquid outside the bearing is sucked into the bearing by the screw action and the pressure difference between the two ends of the bearing. After the bearing is lubricated and cooled, it flows into the teeth which are just disengaged to form a spiral with sufficient lubrication and fast heat dissipation. Self-priming low pressure lubrication system. The advantage of this lubrication method is that the lubricating fluid entering the bearing is all low-temperature medium, and the viscous lubricating fluid is easy to form a dynamic pressure oil film with strong bearing capacity. A large amount of lubricating fluid circulation continuously removes the heat of the bearing and provides good lubrication and cooling for the bearing. Since there is sufficient liquid to fill the root of the gear that has just been disengaged, the self-priming performance of the gear pump is greatly improved, and the suction phenomenon is avoided, which not only improves the volumetric efficiency, but also reduces cavitation and reduces noise. The design institute uses the sliding bearing to be immersed in the medium and forced lubrication through special holes. This technology has been successfully applied in gear pumps in the fields of vinyl, polyester, rubber, resin and fertilizer.

The material of the bearing is usually made of tool steel and is surface hardened to improve its resistance to gluing. If the conveying medium contains abrasive particles, a very hard bearing material such as ceramics should be used. In recent years, GS-1 polytetrafluoroethylene steel composites have been considered as ideal sliding bearing materials.

It is composed of a cold-rolled steel sheet (base), a sintered spherical porous bronze powder or a copper mesh (intermediate layer), and a polytetrafluoroethylene (surface layer) three-layer material, which combines the advantages of metal and polytetrafluoroethylene plastic. Based on this material, the Institute developed a SF-type three-layer composite self-lubricating material with better performance. It replaced the bronze powder layer with a bronze wire mesh, and the plastic formula of the surface layer was carefully selected. The bearing material has the advantages of fatigue resistance, high bearing capacity, small friction coefficient and long service life, and is a novel bearing material for improving the technical performance of the gear pump.
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