Pump cavity anticorrosion protection and rotor shaft keyway damage as an important part of the Roots fan often meet some of the problems encountered during the use of Roots fan, about these issues Roots fan small make up to take you to understand.
1. Anti-corrosion protection of the pump chamber of the Roots fan
Forms of metal corrosion can be divided into two categories: general corrosion and localized corrosion. The former occurs more uniformly over the entire surface of the fan, and the latter occurs only locally. For example, pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion cracking, corrosion fatigue, hydrogen corrosion cracking, abrasion corrosion, delamination corrosion and so on. This is especially true in the petroleum and chemical industries and in the marine atmospheric environment.
For the corrosion of Roots fan, replacement of equipment components is a common method used by enterprises, but the equipment is affected by the material and processing technology with high general value, such as glass lined equipment and other high-value metals, PTFE components and titanium materials. Materials such as the use of polymer composites to prevent surface organic coating is one of the effective corrosion protection measures. Surface bonding protection can be widely used for wear, cavitation, corrosion repair and preventive coatings. Compared with the traditional pressure vessel welding repair, it has good chemical resistance, excellent mechanical properties and adhesive properties. It has the characteristics of simple structure, low cost, safe performance and good repair effect.
2, Roots fan rotor shaft keyway damage
Due to the equipment operating environment and other factors, Roots fans often suffer from wear and tear of the shaft head and keyway. After the problem occurs, it is repaired by conventional methods after repair welding or brush plating. However, the thermal stress generated by the high temperature of repair welding cannot be completely eliminated, and it is easy to bend or break; the brush plating layer is limited by the thickness of the coating, and it is easy to peel off. Moreover, the above methods all use metal to repair metal, and cannot change the “difficult to harden” partnership, under the joint action of various forces, will still cause re-wear.
Bearing cavity wear can be repaired quickly and effectively without machining using polymer composites. Repair welding thermal stress has no effect and the repair thickness is not limited. At the same time, the product's metal material is not acceptable, absorbs shock vibrations from the equipment and allows the mating surfaces to be in contact with 100%, thus avoiding the possibility of re-wear.