Fan impeller and fan adopting same

Abstract

The invention discloses a fan impeller. The fan impeller comprises a rear impeller disc and blades, the bottoms of the blades are installed on the disc surface of the rear impeller disc, and the blades are sequentially arranged in the circumferential direction of the rear impeller disc; the outer side edge of each blade serves as an air outlet edge, wherein an included angle alpha formed between the projection of the outer side edge on the outer circumference face of the rear impeller disc and the normal line of the rear impeller disc is larger than or equal to minus 60 degrees and smaller than or equal to 60 degrees; the inner side edge of each blade serves as an air inlet edge, wherein an included angle beta formed between the projection of the inner side edge on the outer circumference face of the rear impeller disc and the normal line of the rear impeller disc is larger than or equal to 20 degrees and smaller than or equal to 70 degrees; an included angle theta formed between a connecting line between the bottom end of each outer side edge and the circle center of the rear impeller disc and a connecting line between the bottom end of each inner side edge and the circle center of the rear impeller disc is larger than or equal to 10 degrees and smaller than or equal to 65 degrees, and the vertical height h1 of the vertex point of each outer side edge relative to the rear impeller disc is smaller than the vertical height h2 of the vertex point of each inner side edge relative to the rear impeller disc. The invention further discloses a fan adopting the fan impeller. The fan impeller has the advantages of being novel in structure and good in pneumatic performance; the fan adopting the impeller has the advantages of being compact in structure, high in fan efficiency and air pressure and large in generated negative pressure gradient.

Description

technical field [0001] The invention relates to a fan, in particular to a fan impeller and a fan using the impeller. Background technique [0002] The fan is an important part of the range hood. The impeller of the fan plays the role of energy conversion. The performance of the impeller directly affects the performance of the range hood. At present, the traditional impellers for range hoods are generally formed by flat stamping and connected by fastening at both ends. Generally, the blades can only be made into circular arcs with uniform thickness. Since the impeller speed generally exceeds 800RPM, the actual fluid separation between the blades And the backflow is obvious, and because the impeller has a pre-rotation effect on the gas and the direction of the gas will gradually change during the 90° turning process of the gas flowing into the impeller, the purely consistent inlet and outlet angles are not good for the actual working ability of the impeller. In order to impro...

AI Technical Summary

Problems solved by technology

At present, the traditional impellers for range hoods are generally formed by flat stamping and connected by fastening at both ends. Generally, the blades can only be made into circular arcs with uniform thickness. Since the impeller speed generally exceeds 800RPM, the actual fluid separation between the blades And the backflow is obvious, and because the impeller has a pre-rotation effect on the gas and the direction of the gas will gradually change during the 90° turning process of flowing into the impeller, the purely consistent inlet and outlet angles are not good for the actual working ability of the impeller

In order to improve the efficiency of the fan, although people have also made many improvements in the blade structure, these improvements are still limited to the binary flow technology, and the efficiency of the fan is relatively limited. The level of ordinary binary flow impeller technology seriously affects the fan. Performance, so it is still impossible to fundamentally overcome the defects of the above-mentioned binary impeller

In addition, if the impeller structure is not fundamentally changed, under the same wind pressure, the overall structure of the fan is not compact enough and the volume is relatively large

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