Patent ID: 8858203

Claim:
A scroll fluid machine comprising: a cylindrical casing with an opening at either axial end thereof; a fixed scroll provided at the opening on one end of the casing, with a fixed wrap extending toward the casing; an orbiting scroll provided in the casing and having an orbiting wrap with a compression chamber formed between the fixed wrap of the fixed scroll and the orbiting wrap; a rotating shaft with one end engaging with the orbiting scroll to allow the orbiting scroll to perform an orbiting motion, and another end protruding from the opening of another end of the casing; and a discharging centrifugal fan provided on the other end of the rotating shaft; the scroll fluid machine including: a fixed cooling passage provided on a rear of the fixed scroll, with a fixed inlet opened to outside on one radial side of the fixed scroll and a fixed outlet on another radial side of the fixed scroll; an orbiting cooling passage provided on a rear of the orbiting scroll, with an orbiting inlet opened to outside on one radial side of the casing and an orbiting outlet on another radial side of the casing; a cooling air passage with one end communicating with the fixed outlet and the orbiting outlet, and another end communicating with an inner peripheral side of the centrifugal fan through an outer periphery of the other end of the casing; and a fan cover surrounding the centrifugal fan, with an inner peripheral portion connected to the other end of the cooling air passage and with an outer peripheral portion having an exhaust port for discharging a cooling medium coming from the centrifugal fan; wherein there is provided a common inlet duct connected to both the fixed inlet and the orbiting inlet.