| 摘要 |
PURPOSE:To enhance the blowing efficiency by furnishing an exhaust hole, which is opened and closed by the pressure difference between inside and outside the motor body, at the casing of a motor-driven blower machine in such a position as nearer the impeller than the armature. CONSTITUTION:Four exhaust holes 32 for the air discharged by a blower machine are provided in the neighborhood of a brush 29 situated oppositely to a bracket 22 about an armature 31. Eight opening/closing exhaust holes 33 and movable exhaust doors 36 are furnished in such positions as nearer the said bracket 22 than the armature 31. The discharged air Q passes through an exhaust passage 25b to be introduced into the motor, where that portion of the air stream which is not needed for cooling the motor is discharged to the outside through the abovementioned opening/closing exhaust hole 33 by moving the movable exhaust doors 36 without significant flow resistance. This can reduce the back pressure on the discharge side of the blower machine to a great extent.
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