An impeller for a fan and a fan and a range hood using the impeller

Abstract

The invention discloses an impeller for a fan. The impeller has a central axis, and comprises a static impeller; the static impeller comprises at least two first blades arranged around the central axis, and the first blades and the central axis extend in the same direction; the impeller is characterized in that the impeller further comprises a movable impeller comprising at least two second blades, and each second blade corresponds to each first blade; one ends of the second blades are connected with the first blades rotatably, and accordingly the second blades can rotated around the connection position with the first blades toward or far away from the central axis. The invention further discloses a fan and a range hood applying the above impeller, and a control method for the range hood.Through arrangement of the movable impeller and the static impeller which can be rotated relatively, a negative pressure zone can be incased through rotation of the impellers, and the air volume is increased; and the inherent frequency of the impellers is changed, and the grease separation degree is improved.

Description

technical field [0001] The invention relates to a power device, especially an impeller for a fan, a fan with the impeller, and a side suction range hood with the fan. Background technique [0002] Centrifugal fans, relying on the input mechanical energy, use the high-speed rotating impeller to accelerate the gas entering the impeller in the axial direction, then decelerate, change direction, flow out of the impeller radially, and finally exit through the air outlet of the volute. The multi-blade centrifugal fan has a high air volume and pressure, and a small impeller outlet diameter can achieve a large air volume and pressure, low speed and low noise. It is often used in range hoods, suction and exhaust and other fields. [0003] The performance of the impeller directly affects the performance of the range hood. Existing impellers mainly include single-layer and double-layer impellers. At present, the double-layer impeller is mainly composed of front and rear end rings, a m...

AI Technical Summary

Problems solved by technology

The existing impellers have the following problems: 1) When the airflow enters the interior of the multi-blade centrifugal fan impeller, the degree of separation cannot meet the actual needs; 2) The suction ports of traditional side suction range hoods are mainly concentrated in the middle and diffused through the filter. It often results in a place far away from the air inlet, where the negative pressure is not enough, and there will be oily smoke escaping

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