Patent ID: 7234923

Claim:
A scroll fluid machine comprising: a drive shaft having an eccentric shaft portion at one end; a stationary scroll comprising a stationary end plate having a stationary wrap; an orbiting scroll comprising an orbiting end plate having an orbiting wrap rotatably mounted around the eccentric shaft portion of the drive shaft so that a sealed chamber may be formed between the stationary wrap and the orbiting wrap; a self-rotation preventing device for preventing the orbiting scroll from rotating on its axis; an annular groove formed on the stationary scroll, said annular groove having a wider portion being one part of said annular groove in a circumferential direction and having twice a width of said annular groove, a dust seal engaged in the annular groove and having length which is equal to a circumference and a circumferential length of the wider portion, ends of the dust seal being overlapped in the wider portion of the annular groove, circumferential end faces of the dust seal being contacted with or placed close to end faces of the wider portion of the annular groove.