Application of Thermal Spray Technology in Reciprocating Compressor Industry

       In the reciprocating compressor industry, thermal spraying technology is mainly used in the manufacture and repair of surface wear-resistant (anti-corrosion) enhanced coatings of parts and components, and the size recovery of parts and components.



(1) The piston rod is an important part of the reciprocating compressor. During the process of the equipment, the friction surface continuously rubs against the packing, which is easy to cause wear and scratches of the piston rod. The conventional materials of the piston rod are 38CrMoAlA, 42CrMo, 20Crl3, 17-4PH (only for H^S corrosion environment), etc. In this case, the damaged piston rod can be repaired by arc spraying technology; The supersonic flame spraying process, spraying the carbide bustard wear-resistant coating, can greatly improve the wear resistance of the piston rod. After continuous verification, this thermal spraying process can be used not only for surface strengthening of new piston rods, but also for repairing old piston rods, and the metallographic structure of the matrix does not change during processing, maintaining the original mechanical properties; parts during processing Low temperature, no deformation; good applicability, almost not limited by part size; good polishability; simple process and short production cycle.



 



(2) The crankshaft is the main component of the reciprocating compressor. Due to the failure of the lubrication system, the main bearing and connecting rod bearing will be burned, causing strain or burns on the shaft diameter and turning diameter surface of the crankshaft, and a whole circle of groove-shaped scratches will appear. Or cracks, severe burns will appear crack-like micro-cracks throughout the entire radial surface. The conventional way to deal with this kind of damage to the crankshaft is to directly grind off the damage of the shaft diameter and re-install the thickened bearing bush. However, the disadvantage is that the diameter of the shaft will become smaller and smaller, which will eventually lead to insufficient safety factor of the crankshaft; secondly, the thickness and size of the bearing bush will be diversified, which is not conducive to the maintenance of the compressor and the purchase of the bearing bush. In this case, the damaged crankshaft can also be repaired by arc spraying technology. After the repair, it is restored to the original size of the crankshaft, which ensures the versatility of the bearing bush, does not need to re-purchase thickened pads, and facilitates maintenance and procurement management. If the damage occurs again, the coating can be ground off and new sprayed to ensure the long-term serviceability of the crankshaft.



Thermal spraying technology has experienced more than 20 years of development in the reciprocating compressor industry, and is gradually recognized by the market. Through the calculation of the strength of the compressor parts, under the premise of meeting the safety requirements, it has irreplaceable advantages as a component to repair the size, meet and improve various performance requirements.