Centrifugal fan impeller for range hood

Abstract

The invention relates to a centrifugal impeller for a range hood. The centrifugal fan impeller comprises an end ring, a wheel disc and a plurality of blades; an outer edge part of one end of each blade is connected with an inner edge part of the end ring, and the other end face of each blade is connected with an outer edge part of the wheel disc; the centrifugal fan impeller is characterized in that: the cross section of each blade has an airfoil shape; a method for superposing the conventional symmetrical airfoil thickness on a central arched curve is adopted by a generation method for an airfoil molded line, and the central arched line of an airfoil consists of two sections of arcs BE and EF which are tangent to each other. A tangent point E of the arcs BE and EF is the maximum bending position of the airfoil. A projection point of E on a straight line BF where the chord length is is D point, the length of a segment BD is a, the length of the chord BF of the airfoil is c, the maximum bending of the airfoil structure is h, h / c is the maximum relative bending, the maximum thickness of the airfoil structure is L, and L / c is the maximum relative thickness of the airfoil structure. The centrifugal impeller can prevent flow separation in a blade channel or reduce the flow separation degree, the eddy current in the blade channel is reduced, flow loss in the blade channel is reduced, and the inlet loss and noise can be reduced.

Description

technical field [0001] The invention relates to a centrifugal fan impeller of a range hood. Background technique [0002] With the progress of society and the improvement of people's daily life, range hoods are widely used and spread to thousands of households. The fan is the heart and driving force of the range hood, and the impeller is the core component of the fan, and its performance directly affects the aerodynamic performance and noise of the range hood. At present, the range hoods on the market mostly use centrifugal fans, and the centrifugal impellers are mostly made of sheet metal materials, and the blades are mostly arc plate structures, such as the Chinese utility model patent "a fan impeller structure for deep range hoods" (patent No. ZL98225550.0) discloses a circular-arc-blade centrifugal impeller. The circular-arc-blade centrifugal impeller has a big disadvantage that the blade path is prone to flow separation, which leads to a decrease in the aerodynamic per...

AI Technical Summary

Problems solved by technology

At present, the range hoods on the market mostly use centrifugal fans, and the centrifugal impellers are mostly made of sheet metal materials, and the blades are mostly arc plate structures, such as the Chinese utility model patent "a fan impeller structure for deep range hoods" (patent No. ZL98225550.0) discloses a circular arc plate blade type centrifugal impeller. The circular arc plate blade type centrifugal impeller has a big disadvantage that the blade path is prone to flow separation, which leads to a decrease in the aerodynamic performance of the impeller and an increase in noise.

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