Technology for spraying corrosion resistant coating on dry screw compressor rotor

A technology of dry screw compressors and spraying anti-corrosion coating, which is applied in the direction of mechanical equipment, machines/engines, rotary piston pumps, etc. It can solve problems such as uneven thickness, poor coating quality, and weak adhesion, and achieve coating The effect of uniform layer thickness, reasonable meshing gap and excellent adhesion

Inactive Publication Date: 2009-07-22
WUXI COMPRESSOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After using this kind of coating, the quality of the coating is poor, the adhesion is not strong, the thickness is uneven, and the color and luster and water corrosion resistance are sometimes not stable enough, which is easy to affect the service life of the coating.

Method used

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  • Technology for spraying corrosion resistant coating on dry screw compressor rotor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. The material of the rotor body is forged steel 35#, and the pretreatment is carried out first:

[0034] The first condition for the coating not to be damaged is to pre-treat the base material to be sprayed.

[0035] (1) Cut the rotor matrix material into the required rotor blank when calculating the profile of the rotor tool. The spiral surface of the rotor blank should reserve a coating value, and the coating value is: 0.02mm;

[0036] (2) After the rotor blank is processed, the test run is carried out, and the feasible meshing clearance of the rotor profile is tested; 0.28mm;

[0037] (3) The rotor blank is forged from the blank, and after rough machining, it must be treated with stress relief annealing, so as to avoid peeling off of the coating due to stress release due to temperature rise during sintering.

[0038] 2. Stress relief annealing heat treatment of rotor blank:

[0039] (1) Put the rotor blank into the furnace below 220°C;

[0040] (2) Afterwards, h...

Embodiment 2

[0058] 1. Pretreatment of the rotor matrix material:

[0059] The coating value is: 0.03mm; the meshing gap of the rotor profile is; 0.3mm;

[0060] 2. Stress relief annealing heat treatment of rotor blank:

[0061] (1) Put the rotor blank into the furnace below 220°C;

[0062](2) Afterwards, heat up to 600°C at a rate below 80°C / hour;

[0063] (3), when the temperature is: 580 ℃, heat preservation for 3 hours;

[0064] (4) Cool in the furnace to below 300°C;

[0065] (5) When the temperature in the furnace reaches below 300°C, take out the rotor blank from the furnace;

[0066] (6), then placed in the atmosphere to cool.

[0067] 3. Pre-treatment of spraying anti-corrosion layer:

[0068] (1) The surface of the rotor blank to be sprayed is cleaned with acetone or trichlorethylene;

[0069] (2) Sinter in an electric furnace after cleaning, and sinter at a temperature of 300°C for 3 hours;

[0070] (3) After sintering and cooling, the rotor blank is subjected to sandbla...

Embodiment 3

[0080] Using the process steps and process conditions in Embodiment 1 and Embodiment 2, the rotor coated with an anti-corrosion layer can also obtain the above effects. The thickness of the rotor spiral surface coating is 0.03mm, and it only needs to be sprayed once to reach the desired thickness, and then dried; the thickness of the rotor spiral end surface coating is 0.06mm, and the thickness of the outer circle coating of the rotor shaft seal is: 0.06mm (thickness above 0.03mm); therefore, when using a spray gun to spray the rotor helical end face and the outer circle of the rotor shaft seal, it must be sprayed more than two times, and pre-drying treatment should be carried out every time it is sprayed.

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Abstract

The invention relates to a processing method for spraying an anticorrosion layer on a rotor of a dry screw compressor, in particular to spraying a polytetrafluoroethylene anticorrosion layer on the outer surface of the rotor screw of a dry screw compressor, and belongs to the technical field of mechanical spraying technology. It mainly pre-treats the rotor matrix material, anneals the rotor blank for stress relief, then pre-treats the anti-corrosion layer by spraying it, sprays the polytetrafluoroethylene anti-corrosion layer, and finally performs sintering treatment and testing for the finished rotor. The coating thickness of the invention is uniform, the color is black, and has no corrosive effect on the base material of the substrate, the hardness is pencil hardness H-2H, the heat resistance is good, the meshing gap is reasonable, and the tetrafluoro layer is intact; the coating and the base have excellent adhesion Adhesion, no blistering, oxidation, and peeling; under normal operating conditions for dry screw compressors, the service life of the coating can reach more than 24,000 hours, which can ensure that the compression cavity (airway) of the rotor casing does not rust and Can provide pure compressed air.

Description

technical field [0001] The invention relates to a processing method for spraying an anticorrosion layer on a rotor of a dry screw compressor, in particular to spraying a polytetrafluoroethylene anticorrosion layer on the outer surface of the rotor screw of a dry screw compressor, and belongs to the technical field of mechanical spraying technology. Background technique [0002] The corrosion resistance of the air passage of the dry screw compressor and the purity of the gas are the key issues to obtain oil-free and clean compressed air in the dry screw compressor. Since the rotor is a moving part, its rotating speed is high, the spiral profile is complex, and the tolerance range is small. It is not easy to choose a suitable formula and a coating with qualified adhesion. If there is no correct rotor profile and practicable Engage the gap and the coating peels off easily. [0003] Before the present invention was made, in the prior art, the outer surface of the rotor helix of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C18/16
Inventor 周嵩荃
Owner WUXI COMPRESSOR CO LTD
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