Volute molded line generation method, volute, fan system and extractor hood

Abstract

The invention discloses a volute molded line generation method which comprises the following steps: 1) determining at least three positioning points with characteristic meaning of a circle center, wherein the characteristic meaning is volute throat gap positioning, volute height or volute width; 2) taking the circle center as the original point, and determining a volute molded line in a curve fitting way according to coordinates of each positioning point; 3) after determining each positioning point, reversely deducing a coefficient m of Archimedes or log spiral, and fitting a curve graph withrespect to m-Phi by a smooth curve through an m value corresponding to each positioning point, wherein Phi is an included angle formed by the point and a starting radial section of the volute; 4) calculating to obtain values under different values through an Archimedes or log spiral formula: FORMULA, thereby obtaining a corresponding corrected volute molded line. The invention further discloses avolute generated by the method, a fan system applying the volute, and an extractor hood applying the fan system.

Description

technical field [0001] The invention relates to a power system, in particular to a method for generating a volute, a volute obtained by the method, a fan system using the volute, and a range hood using the fan system. Background technique [0002] A centrifugal fan is generally composed of a volute, a motor, and an impeller. The working principle of the centrifugal fan is that the motor drives the impeller to rotate to do work on the air flow, and it is discharged radially through the diffusion effect of the volute. [0003] The volute and volute profile of the existing centrifugal fans are usually designed using conventional logarithmic spirals and Archimedes spirals. For example, the Chinese patent application number 201510135345.2 discloses a volute of a range hood, including a volute front plate, a volute rear plate, a volute flange, and a volute coaming plate connecting the volute front plate and the volute rear plate , the volute coaming connects the volute front pla...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned traditional design methods assume that the flow parameters on the inlet circumference are uniformly distributed and the air flow moment in the volute is constant. The aerodynamic performance and noise performance of the fan system using this design idea on the range hood are not good; in addition, the volute The dimensions on the molding line are too strongly correlated. For example, increasing the width will inevitably affect the height, and the change of the volute tongue gap will inevitably affect the outlet size, which cannot be reasonably limited according to the requirements of the box body (often there are restrictions on height and width). The size of each dimension of the volute achieves the best performance

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