Through the performance test of screw air compressor by changing work conditions, analyzing the test results, investigating other air compressor basic parameters, several suggestion and reference about the Auxiliary equipment s design and choice of screw air compressor are presented.

Through analysing the struction and theory of explosion screw air compressor for coal mine,analysing the safety and economic of the system in usage in front and back,points out the importance that system in the modern well to produce and fix.

Application of screw air compressor oil on electric locomotives;

Screw air compressor oil is developed to meet the requirement that the new type railway passenger locomotive be equipped with screw air compressor.

Aptitude controller of screw air compressor jointly developed by the author and certain air compressor factory are studied.

The paper discusses about the basic performance and the character of oiljet screw air compressor and gives details about the main part and performance parameter of the lubricating oil system, lastly describes the common failures in the lubricating system and the treatment of the problems.

Througheut comparing screw air compressor oil that we developed independently with Shell Corena RS_(32) in physico-chemical performances we drawed the conclusion that screwair compressor oil show choice is superior to Shell Corena RS_(32) in some performance index and can be applied safely in the electric locomotive.