Patent ID: 7419371

Claim:
A scroll fluid machine comprising: a driving shaft having an eccentric axial portion at one end and having an axial cooling hole through which cooling external air sucked from a front end flows to cool the driving shaft and is discharged from a rear end; a fixed scroll having a spiral fixed wrap on one side and a cooling fin at the other side; an orbiting scroll having a spiral orbiting wrap which engages with the fixed wrap to form a compressing chamber between the fixed and orbiting wraps, the orbiting scroll being rotatably secured around the eccentric axial portion of the driving shaft; and a cooling fan rotatably secured on the driving shaft and comprising a base plate that has a main fin on one side surface facing a side surface of said fixed scroll and a plurality of auxiliary fins on the other side, the driving shaft enabling the cooling fan to rotate to cool a side of the fixed scroll by the main fin, said plurality of auxiliary fins preventing invasion of cooling-finished air into the cooling hole of the driving shaft from an outer circumference of the cooling fin of the fixed scroll.