High viscosity pump bearing construction

High-viscosity pump bearings are usually used in the sliding bearing, and non-bearing surface of the bearing wall specially designed spiral flow path, spiral groove and the steering shaft gear rotation the same. The outer end of the bearing communicates with the inlet of the pump, and the spiral groove at the inner end of the bearing communicates with the root of the gear (vacuum part). As the shaft rotates, the low temperature liquid outside the bearing is drawn into the bearing by means of the helical action and the pressure difference between the two ends of the bearing. After the bearing is lubricated and cooled, it flows into the tooth just disengaged to form a fully lubricated and heat-dissipating screw Self-priming low-pressure lubrication system. The advantages of the lubrication method are as follows: all the lubricating liquid entering the bearing is a low-temperature medium, and the viscous lubricating liquid tends to form a dynamic pressure oil film with a strong carrying capacity. A large number of lubricating fluid circulation continue to take the heat of the bearing, the bearing play a good role in lubrication and cooling. Because there is sufficient liquid to fill just off the meshing gear roots, greatly improving the pump self-priming performance, to avoid the phenomenon of suction, not only can improve the volumetric efficiency, but also help to reduce cavitation and reduce noise. Sichuan Machinery Research and Design Institute of the use of sliding bearings immersed in the medium, and forced lubrication through special channels, the technology has been in the vinylon, polyester, rubber, resins, fertilizers and other fields gear pump successfully applied. High-viscosity pump bearing materials commonly used tool steel and hardened to improve its anti-gluing capacity. If the conveying medium contains abrasive particles, a hard bearing material such as ceramic should be used. In recent years, GS-1 PTFE steel composite is considered as the ideal sliding bearing material. It is made of cold-rolled steel plate (substrate), sintered spherical porous bronze powder or copper mesh (intermediate layer), PTFE (surface layer) three layers of composite materials, both metal and PTFE plastic advantages. On the basis of this material, Shanghai Institute of Materials has also developed a better performance SF-type three-layer composite self-lubricating material, which uses bronze wire instead of bronze powder layer, the surface of the plastic formula carefully selected. This bearing material fatigue resistance, high load capacity, low friction coefficient, long service life, is to improve the technical performance of gear pump new bearing material.