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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

Active Publication Date: 2015-06-10
BONAIRE AUTOMOTIVE ELECTRICAL SYST
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Problems solved by technology

[0017] The existing equilateral primitive method drawing design and unequilateral primitive method drawing design are all replaced by simplified four-segment arc approximation, and the designed volute has a relatively small deviation from the Archimedes spiral. Big

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  • Design method of profile of volute of centrifugal fan
  • Design method of profile of volute of centrifugal fan
  • Design method of profile of volute of centrifugal fan

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Embodiment Construction

[0035] The specific implementation manner of the present invention will be described in further detail below by describing the embodiments with reference to the accompanying drawings.

[0036] Such as figure 1 with figure 2 As shown, the high-efficiency and low-noise centrifugal fan volute profile design method, using CATIA software to design the volute profile effectively reduces the noise of the air-conditioning system and improves the efficiency of the centrifugal fan.

[0037] The centrifugal fan volute designed by CATIA software is an equiangular helix, which can be approximately equivalent to the Archimedes helix. The whole curve is uniform and smooth, and the curve is accurate.

[0038] The CATIA parametric design is introduced into the design of the centrifugal fan volute profile, which improves the drawing efficiency and design quality of the centrifugal fan volute profile. At the same time, the reference of the logarithmic equation makes the radius R(θ) of the po...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42
CPCF04D29/4206
Inventor 方向华张仕伟
Owner BONAIRE AUTOMOTIVE ELECTRICAL SYST
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