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The gears and shafts of high-viscosity pumps are made into one body, and their rigidity and reliability are higher than those of high viscosity pumps manufactured separately from gears and shafts. The gears of low-pressure high-viscosity pumps abroad often adopt a square structure, that is, the tooth width of the gear is equal to the diameter of the tooth tip circle. The tooth width of the SS high viscosity pump used in high-pressure occasions is smaller than the diameter of the addendum circle. This is to reduce the radial pressure area of the gear and reduce the load of the gear and bearing.
The bearings of high-viscosity pumps usually adopt sliding bearings, and the spiral flow channels are specially designed on the non-load bearing surface of the inner wall of the bearing. The rotation direction of the spiral groove is the same as that of the gear shaft. The outer end of the bearing communicates with the liquid inlet of the pump, and the spiral groove on the inner end of the bearing communicates with the root of the gear tooth (vacuum part). When the shaft rotates, the low temperature liquid outside the bearing is sucked into the bearing by the action of the screw and the pressure difference between the two ends of the bearing. After the bearing is lubricated and cooled, it flows into the teeth that have just been 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 all the lubricating fluid entering the bearing is a 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 constantly takes away the heat of the bearing, which plays a good role in lubricating and cooling the bearing. In this way, because there is enough liquid to fill the root of the gear teeth that just disengaged, the self-priming performance of the high-viscosity pump is greatly improved, and the phenomenon of suction is avoided, which can not only improve the volumetric efficiency, but also help reduce cavitation and reduce noise. Sichuan Mechanical Research and Design Institute adopts the immersion of sliding bearings in the medium and forced lubrication through special holes. This technology has been successfully applied to high-viscosity pumps in the fields of vinylon, polyester, rubber, resin, fertilizer and other fields.
The material of the bearing is usually tool steel, and the surface is hardened to improve its anti-gluing ability. If the conveying medium contains abrasive particles, very hard bearing materials such as ceramics should be used. In recent years, GS-1 polytetrafluoroethylene steel composite material is considered to be an ideal sliding bearing material. It is composed of cold-rolled thin steel plate (substrate), sintered spherical porous bronze powder or copper mesh (intermediate layer), and polytetrafluoroethylene (surface layer). It has the advantages of metal and polytetrafluoroethylene plastic. On the basis of this material, Shanghai Institute of Materials has developed an excellent SF type three-layer composite self-lubricating material. It replaces the bronze powder layer with a bronze wire mesh, and the plastic formula on the surface layer is carefully selected. This bearing material is resistant to fatigue, high load-carrying capacity, small friction coefficient, and long service life. It is a new bearing material that improves the technical performance of high viscosity gear pump.
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