| 摘要 |
A refurbishment process for a volumetric screw compressor of the ‘oil-free’ type, which comprises a male rotor and a female rotor, is described. The process comprises visually checking the wear condition of the rotors, treating their surface for removing the previous coating, and applying a new coating on the surface. The composition of the coating applied on the surface of the rotors consists of the following materials:;MaterialAmount (g)Polytetrafluoroethylene750 ÷ 850(954G 303 C Teflon, DuPont)Amorphous graphite powder300 ÷ 400Thinner for spray cleaning apparatuses200 ÷ 270(8595 thinner, DuPont)Methyl ethyl ketone (MEK)170 ÷ 220Cellosolve acetate coating additive200 ÷ 300(Syn Fac 800 resin) |
| 主权项 |
1. A refurbishment process of a volumetric screw compressor of the ‘oil-free’ type, said compressor comprising a pumping unit with an outer body and an inner chamber, comprising a first and a second seat adapted to accommodate respective male and female rotors provided with respective reversing helical screws meshing each other, said process comprising gradually disassembling the components of the compressor up to extraction of a rotor at a time from the respective seats of the chamber, visually checking the wear condition of the rotors, treating the rotor surface to remove the previous coating, applying a new coating on the surface of the rotors, repeating the operations of treating and applying a coating on the outer body of the pumping unit, inserting and then extracting one rotor at a time into the respective seat and checking for lack of interference, reassembling the pumping unit by meshing and inserting the two rotors inside the seats with further checking for lack of interference, reassembling the remaining components of the compressor,
said process being wherein the composition of the coating applied on the surface of the rotors consists of the following materials:AmountMaterial(g)Polytetrafluoroethylene750-850(954G 303 C Teflon, DuPont)Amorphous graphite powder300-400Thinner for spray cleaning200-270apparatuses(8595 thinner, DuPont)Methyl ethyl ketone (MEK)170-220Cellosolve acetate coating200-300additive(Syn Fac 800 resin) |
