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AIR MOTORS USES AND WORKING




Compressed air is used in wide variety of applications where use of electric motors of SI Engine is not permissible and where high safety is required to be met as in mining applications. Pneumatic breakers,   picks, spades, rammers, vibrators, riveters, etc., form a range of hand tools having wide use in construction work.

 Basically the cycle in the reciprocating expander is the reverse of that in the reciprocating compressor.   Air is supplied from an air receiver in which air is at approximately ambient air temperature. The state 1   is the point of cut -off. Air expands in the cylinder according to the low pv^n =c (where n = 1.3) pushing   the piston out and doing work against the surroundings till the point of release at 2. There is blowdown   of  air from 2 to 3 and air is exhausted from 3 to 4. The compression of trapped or cushion air begins at 4   and ends at 5 according to the pV^n = c and the compressed air is again admitted to repeat the cycle.      



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