Design method of profile of volute of centrifugal fan

A design method and centrifugal fan technology, applied in the direction of mechanical equipment, machine/engine, liquid fuel engine, etc., can solve the problem of large deviation of the volute shape line, achieve the effect of improving efficiency, reducing the possibility of backflow, and rapid design
CN104696282AActive Publication Date: 2015-06-10BONAIRE AUTOMOTIVE ELECTRICAL SYST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BONAIRE AUTOMOTIVE ELECTRICAL SYST
Publication Date
2015-06-10

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Abstract

The invention discloses a design method of the profile of a volute of a centrifugal fan. According to the design method of the profile of the volute, R0 is the radius of an impeller of the centrifugal fan, and A is the opening of a spiral line. The method comprises steps as follows: 1) using CATIA software for establishing a group of points by the aid of polar coordinates in a CATIA software sketch, wherein the polar coordinates of the points are (R(theta), theta), R(theta)=R0*e<theta / K> is an equation I, e is a mathematical constant, equal to 1 plus 1 / (1!)plus 1 / (2!)plus 1 / (3!) plus...plus1 / (n!) and approximately equal to 2.71828, theta is any degree and is required to be converted into a radian unit, and K is a fixed constant and is calculated through A=R(360)-R0 and the equation I; 2) sequentially connecting all the points according to a spline command to establish a spline; 3) double-clicking the spline to pop up a 'spline definition' dialog box, defining all control points in the dialog box to be tangent, and finishing the establishment of the profile of the volute after definition. The noise value of the fan of an air conditioning system can be effectively deceased, and the efficiency of the centrifugal fan of the air conditioning system is improved.
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Description

technical field

[0001] The invention relates to the technical field of centrifugal fans, in particular to a method for designing a spiral case profile of a centrifugal fan. Background technique

[0002] The role of the volute of the centrifugal fan is to guide the gas leaving the impeller of the centrifugal fan to the outlet of the volute, and convert part of the dynamic pressure into static pressure.

[0003] The structure of the volute is a complex space surface body, and the shape of the volute is a helix, but it is difficult to draw because of the complicated structure of the helix. Therefore, the existing design is replaced by a simplified four-segment arc approximation. Whether it is the volute shape line drawn by the equimargin method or the volute shape line drawn by the unequal distance method, it is consistent with the Archimedes spiral. The deviation of the line is large.

[0004] Such as Figure 4 Shown is the equilateral primitive method to draw the design vol...

Claims

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