Ventilator
A technology of ventilating fans and air intakes, applied in the field of ventilating fans, can solve the problems of large volume, affecting the smoothness of the air flow, and the noise value is difficult to achieve an ideal state, and achieves the effect of reducing noise and good noise reduction.
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[0017] Figure 2A It is a schematic diagram of the first embodiment of the present invention. Figure 2B It is a schematic cross-sectional view of the first embodiment of the present invention. Such as Figure 2A As shown, the ventilation fan 100 includes: a frame 110 with an opening 111 , a snail shell 130 with an air suction port 120 disposed in the frame 110 , and a fan 131 disposed in the snail shell 130 . Also from the tongue 121 of the snail shell 130 to the direction opposite to the direction of rotation of the blower fan 131 turn 90 degrees (in Figure 2A and Figure 2B , within the range of arrow A rotating clockwise), a circuit board box 200 is fixed on the outer periphery of the air suction port 120 of the ventilator snail shell 130, and the circuit board box 200 is located on one side of the cover 210 on the air suction port side of the snail shell 211 matches the shape of the circumference of the air suction port, that is, after forming an arc-shaped chamfer, ...
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