Air duct structure and fan

Abstract

The invention relates to an air duct structure and a fan, the air duct structure comprises an air outlet shell and a sprue spreader structure, a plurality of side air outlets are formed in the circumferential surface of the air outlet shell at intervals, an air outlet cavity and a plurality of side air outlet channels are formed in the air outlet shell, the sprue spreader structure is arranged in the air outlet cavity and comprises a plurality of side sprue spreaders, and all the side sprue spreaders are in a radial shape around a shunting axis; the flow dividing axis is parallel to the first direction, the part of each side flow dividing cone is located in one side air outlet channel, and an inter-cone flow channel is formed between the parts, located outside the side air outlet channels, of at least two adjacent side flow dividing cones. By means of the fluid Coanda effect, a spure spreader structure is adopted in an air outlet cavity in the air duct shell, multiple air inlet airflow flows into the corresponding side air inlet channels along side spure spreaders, and finally multiple air outlet airflow is formed at all side air outlets. On the basis of improving the air pressure of the air outlet and reducing the internal air resistance of the flow channel, an efficient, uniform and low-noise circumferential surrounding air supply function is realized.

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