Range hood centrifugal fan with double air inlet structure

Abstract

The invention discloses a range hood centrifugal fan with a double air inlet structure. The range hood centrifugal fan comprises a volute and an impeller arranged in the volute, the volute comprises a front cover plate, a rear cover plate, an annular middle shell and volute tongues, the annular middle shell is connected between the front cover plate and the rear cover plate, a motor is arranged at the center of the impeller, each volute tongue is provided with a volute tongue surface projecting along a direction far away from the joint of the volute tongue and the shell, each volute tongue surface comprises a front inclined curved surface and a rear inclined curved surface which are asymmetric and are in smooth transition connection, and the intersecting line of the two inclined curved surfaces is the outermost projection of the volute tongue surface. By the aid of the bidirectionally inclined volute tongues, distribution of the inclined curved surfaces conforms to airflow velocity distribution, a new noise source generated at the volute tongue more effectively offsets part of original noise, and noise reduction capacity is improved. The intersecting line of the two inclined curved surfaces of each bidirectionally inclined volute tongue is aligned to a central disk of the impeller as far as possible, the inclined directions of the volute tongues corresponding to air inlets in two sides of the double air inlet impeller are consistent, and better noise reduction effects are achieved.

Description

technical field [0001] The invention relates to a range hood, in particular to a range hood centrifugal fan with a double air inlet structure. Background technique [0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Generally, range hoods include top-suction and side-suction types. Top-suction range hoods are neat, light, and take up less space. It has more and more widespread applications. The top-suction range hood usually includes a fume collection hood, a fan casing positioned on the fume collection hood, and a volute, an impeller and a motor for driving the impeller are installed in the fan casing. The air inlet of this range hood is located on the side of the volute, that is, one-sided air intake, the air intake area is small, and the amount of oil fume exhaust is not very satisfactory. For this reason, some range hoods with double-side air intake have also been disclosed at present, and air inlets are all opened on the fr...

AI Technical Summary

Problems solved by technology

However, due to the uneven axial distribution of the impeller outlet airflow of the centrifugal fan, the flow velocity of the single-inlet impeller outlet gradually increases from the end ring to the rear disk, while the flow velocity of the double-inlet impeller outlet gradually increases from the front ring to the middle disk. , and then gradually becomes smaller from the middle plate to the rear end ring, so this structure is reasonable for a single-inlet centrifugal fan, but it is not suitable for a centrifugal fan with double-sided air intake. Only one-way inclined volute tongue is sufficient Does not conform to the velocity distribution of the airflow, and the noise reduction effect is limited

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