Ceiling type ventilation fan

Abstract

The invention discloses a ceiling type ventilation fan. The ceiling type ventilation fan comprises an air ventilating structure. The air ventilating structure comprises a multi-vane impeller, a snail shell, an impeller drive motor and a motor installation frame. The snail shell comprises a shell body, an air inlet and an air outlet. The multi-vane impeller is arranged inside the shell body in the vertical direction. The motor installation frame is arranged above the multi-vane impeller and is separated from the multi-vane impeller. The bottom middle area, away from the direction of the multi-vane impeller, of the shell body protrudes and forms a first concave portion. The air inlet is formed in the bottom of the first concave portion, and the air inlet and the first concave portion form a first annular boss-shaped structure. The lower end of the multi-vane impeller extends into the first annular boss-shaped structure, is opposite to the air inlet, and is further isolated from the inner wall of the first concave portion and the air inlet. Under the conditions that the ventilation fan is communicated with a long outdoor pipeline or the external wind pressure is large, the multi-vane impeller can be prevented from touching the motor installation frame or the snail shell, and when the multi-vane impeller of the same performance is adopted, air reverse flow and abnormal sounds are reduced.

Description

technical field [0001] The invention relates to the technical field of indoor ventilation equipment, in particular to a ceiling-mounted ventilation fan capable of increasing static pressure and reducing noise. Background technique [0002] A ventilator is a common ventilation device, and a ceiling-mounted ventilator is a type of device that is placed on a ceiling frame to draw indoor air from above the ceiling. [0003] figure 1 What is shown is an existing ceiling-mounted ventilation fan, which includes a box-shaped casing 100 and an exhaust structure disposed inside the casing 100 . Wherein, the air draft structure includes a multi-wing impeller 120, a snail shell 130, an impeller driving motor 140 and a motor mounting frame 150; the snail shell 130 includes a housing 134, an air inlet 131 and an air outlet 132; the motor mounting frame 150 It is arranged on the top of the housing 134; the impeller drive motor 140 is fixed on the motor mounting frame 150, and drives the ...

AI Technical Summary

Problems solved by technology

[0006] In the case of a long pipe connected to the outside or a high external wind pressure, the exhausted air is prone to reverse flow, and then flows back to the air inlet 131 through the above-mentioned gap H, and then conflicts with the inhaled airflow at the air inlet 131, which will not only cause Abnormal sound is produced, and it will also cause a certain pressure loss

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