Air occupy a certain space,but it has no fixed shape and size.Airtight containers in the air pressure,the volume of air to be compressed so that the internal pressure increases.When the withdrawal of foreign forces,the internal air pressure in the role,will be restored to the original size.If the containers in the activities of an object,when the volume of air restoration,the objects will be containers air pressure to push up to.This principle is widely used in the production and life.For example:in the ball into the compressed air,gas,the feet,the ball hard; into the compressed air in the tyres,tyres will be able to bear a certain weight.In large cars,the use of compressed air brake switch and the door; use of compressed air pressure of the water pressure,in factories,compressed air used to activate GAS HAMMER Having in the coal mine,it drove Fenghao drilling eyes.Compressed air is also used piped liquid and granular objects.
Compressed air is the second largest after the power dynamic energy,is a multi-purpose process gas source,the application will cover the petroleum,chemical,metallurgical,power,machinery,light industry,textile industry,automobile manufacturing,electronics,food ,pharmaceutical,biochemical,defense,scientific research,and other sectors and departments.Compressed air is not ideal contains a considerable number of impurities,are:solid particles - in a typical environment of the cities in every cubic metre of the atmosphere contains about 100 million 4 10 million particles,of which about 80% smaller in size,2 μ m,air compressor suction filter unable to eliminate.In addition,air compressor system will continue to produce wear debris,rust and oil residue carbide,which will speed up wear and tear gas equipment,resulting in seal failure; water - relative humidity in the atmosphere as much as 65 percent above normal,The compression refrigeration,air becomes saturated wet,and a lot of entrainment of liquid water droplets,which are equipment,rusty pipes and valves of the root causes of the winter ice will be blocked holes in the pneumatic system access.It is worth noting that:even if the net is isolated in pure saturated air,as the temperature decreased,there is still a condensed water out岀,about one in 10 ℃ reduce their saturated water will be decreased by 50 per cent,or half of the water vapor transformed into liquid water drops (see table 1).Therefore,in the compressed air system in a multi-stage separation or compressed air filtration devices pretreatment into a certain relative humidity in the dry gas is very necessary; oils - high-speed,high-temperature operation of the air compressor used lubricating oil can play sealing and cooling,but the compressed air pollution.Use self-lubricating materials for the development of small oil and non-oil - and-oil-free compressed air while reducing the oil content,but also the resulting vulnerability of the lower life expectancy,machinery and internal pipeline corrosion and air system Press in the breaking-in period,wear period and the period could be reduced side effects such as increased oil content.This pursuit of high reliability automated production line is a threat.It should also be emphasized that岀:from the air compressor to the system of oil in any case no good.After repeated because the high temperature oxidation and condensate emulsified oil has been significantly reduced performance,and the acid,the follow-up lubrication equipment not only ineffective,it will undermine the normal lubrication; microorganisms - in the pharmaceutical,biotechnology,food manufacturers and packaging process,the bacteria and bacteriophage pollution should not be neglected.