| 摘要 |
PURPOSE: A spiral type ventilator with a bell mouth is provided to induce a pressure difference and an air flow direction by generating a vortex by rotating a first fan which comprises a rotary plate and blades, thereby maximizing exhaust efficiency. CONSTITUTION: A spiral type ventilator with a bell mouth comprises a housing(10), a motor(60), a rotary shaft(50), a first fan(30), a bell mouth(34), and a second fan(40). The housing is formed into a hollow cylindrical shape in which the diameter of one end portion is larger than the diameter of the other end portion. The motor is comprised in the inside of the housing. The rotary shaft is mounted in the motor. The first fan is mounted in the rotary shaft and comprises a rotary plate and blades. The rotary plate is formed into a curved shape in which an outer edge portion is bent toward a motor and a central portion is closed. The blades are arranged along the outer edge portion of the rotary plate and fixed by being erected to a radial direction. The bell mouth covers the first fan from below of the first fan.
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