A diversion device, a centrifugal fan and a range hood using the diversion device

Abstract

The invention discloses a flow guide device, which comprises a flow guide surface, the flow guide surface is jointly surrounded by a first curved section, a second curved section, a third curved section and a first straight line section, the first curved section, the third curved section segment, the first straight line segment and the second curved segment are connected end to end in turn, with the starting point of the first curved segment as the origin of coordinates, and the two perpendicular straight lines passing through the origin of the coordinates on the plane where the first curved segment is located are recorded as the X-axis and Y-axis, the Z-axis is perpendicular to the X-axis and Y-axis, the coordinates of the end point of the first curve segment are (x3, y3), and satisfy x3≠0, y3≠0, the starting point and end point of the first straight line segment None of the Z coordinates are equal to 0. Also disclosed are a centrifugal fan using the above-mentioned flow guiding device, and a range hood using the above-mentioned centrifugal fan. Compared with the prior art, the present invention has the advantages that: by making the guide surface of the guide device consist of three curves, it can effectively guide the airflow to turn, and reduce the turning energy loss and aerodynamic noise.

Description

technical field [0001] The invention relates to a power device, in particular to a flow guiding device, a centrifugal fan with the flow guiding device, and a range hood. Background technique [0002] Range hoods have become one of the indispensable kitchen appliances in modern families. The range hood uses the principle of fluid dynamics to work, sucks and exhausts the range hood through a centrifugal fan installed inside the range hood, and uses a filter to filter some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute and a motor that drives the impeller to rotate. When the impeller rotates, a negative pressure suction is generated in the center of the fan, and the oil fume under the range hood is sucked into the fan, and after being accelerated by the fan, it is collected by the volute and guided out of the room. [0003] For thin range hoods, the fan system is generally placed horizontally, and the air outlet is mainly from the...

AI Technical Summary

Problems solved by technology

[0006] Due to the complex airflow movement at the outlet of the volute, the airflow noise caused by it is relatively large, and the arc-shaped structure can only slightly reduce the noise, but there is no significant improvement

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