Centrifugal fan

Abstract

The invention provides a centrifugal fan, which comprises a fan frame and an impeller accommodated in the fan frame, wherein the fan frame comprises a bottom plate, a cover plate and side plates, the side plates are positioned between the bottom plate and the cover plate, the bottom plate comprises an inner surface facing the impeller and an outer surface opposite to the inner surface, the middle part of the bottom plate is provided with a fixing seat, the impeller is rotationally and fixedly arranged on the fixing seat, the bottom plate is provided with a plurality of first air inlet openings penetrating through the inner surface and the outer surface on the outer periphery of the fixing seat, a first connecting arm is formed between the two adjacent first air inlet openings, and is connected between the fixing seat and the bottom plate, each first air inlet is provided with an arc-shaped outer side edge opposite to the fixing seat, the inner surface of the bottom plate is provided with first convex rings projecting and extending towards the impeller on the outer periphery of the first air inlet openings, the arc-shaped outer side edges of the first air inlet openings are coincident with the inner walls of the first convex rings, chamfered surfaces are formed on the outer surface at the edge of each first air inlet opening, and the chambered surfaces are inclined to face one side of the outer surface and have arc-shaped cross sections.

Description

technical field [0001] The invention relates to a fan, in particular to a centrifugal fan for cooling electronic components. Background technique [0002] With the rapid development of the computer industry, the heat dissipation problem derived from the pursuit of high speed, high function and miniaturization of CPU is becoming more and more serious, which is more prominent in electronic devices with small internal space such as notebook computers. If the heat generated by electronic components such as the CPU cannot be dissipated in a timely and effective manner, the performance of the electronic components will be greatly affected, and the service life of the electronic components will also be shortened. Therefore, it is necessary to dissipate heat from the electronic components. [0003] At present, the industry often uses centrifugal fans to dissipate heat from electronic components. An impeller in the accommodation space, the bottom plate and the cover plate are provid...

AI Technical Summary

Problems solved by technology

When the centrifugal fan is working, the high-pressure airflow generated by the impeller accumulates between the impeller and the side plate, part of the high-pressure airflow rebounds from the sidewall and flows into the impeller, and mixes with the natural airflow entering the impeller, which not only causes the pressure loss of the centrifugal fan , also cause noise

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