Patent ID: 7703700
Filing Date: 2010-04-27
Classification: B05B

Abstract:
1. A rotary atomizing head type coating machine, comprising: a tubular housing internally defining a motor compartment; an air motor accommodated in said motor compartment of said housing to drive a rotational shaft by a turbine; a rotary atomizing head mounted on a fore end portion of said rotational shaft of said air motor on the front side of said housing; a paint passage carrying a paint to be supplied to said rotary atomizing head; a turbine air passage provided in said housing and carrying turbine air for driving a turbine of said air motor; and a dual passage extended through said housing from a turbine chamber of said air motor, said dual passage including inner and outer passages arranged in concentric relation with each other; wherein said inner passage of said dual passage is an exhaust air passage provided in said housing and carrying exhaust air which is discharged from the turbine chamber of said air motor after driving said turbine and finally discharged out of the machine; wherein said outer passage of said dual passage is a first part of a heat insulating air passage that carries heat insulating air that is at a higher temperature as compared with said exhaust air; and an upstream end of the heat insulating air flowing into said outer passage is provided at the position in the proximity of said air motor and a discharging end opening serving as the downstream end of the heat insulating air discharging from said outer passage; and wherein said outer passage is not in fluid communication with the inner passage over its entire length.