| 摘要 |
PURPOSE:To prevent the separation in fluid so as to reduce noise, miniaturize the motor fan, and improve the relationship between air quantity and pressure by making roundness on the shoulder part directed to the moving blade of the rotor part of a motor. CONSTITUTION:In a motor fan 1, since the shoulder part directed to the moving blade 3 of the rotor part 2a of a motor 2 have roundness, the flow D passing through the space within the blade 3 is, as shown in figure, removed from the condition of sparation nearby a boss (hub) F. As a result, the fan 1 is translated to an axial symmetric stall prior to a turning stall, thereby a drop curve E in the characteristic curve related to air quantity Q and pressure P, being peculiar to an axial fan, is eliminated so that the relationship between the air quantity and pressure is improved and it is possible to reduce noise. As the blade 3 is integratedly connected to the rounded part of the rotor part 2a, the cause of the separation is furthermore reduced. With this arrangement, it is possible to reduce the noise, improve the relationship between the air quantity are pressure, and miniaturize the fan 1.
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