| 摘要 |
The unit (1) comprises - a positive-displacement compressor (2) including: * a prime mover (4) , * a rotatable shaft (5) rotatable by the prime mover (4) , and * at least one cylinder (7-10) in which an associated piston (11, 12) , coupled to the shaft (5) by means of a crank mechanism (13, 14) , is mounted for sliding in a leaktight manner ; and - a heat-exchanger unit (3) for receiving and cooling the compressed fluid produced by the compressor (2) . The unit comprises at least one tapping duct (41; 41a, 41b) extending between the heat-exchanger unit (3) and that region of the at least one cylinder (7-10) which is disposed between the associated piston and the shaft (5) , the duct being suitable for supplying a flow of compressed fluid to that region in operation in a manner such that the flow of fluid can expand and be cooled further in that region. |
