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Volute of centrifugal fan and centrifugal fan comprising same

A technology of centrifugal fan and volute, which is applied in the direction of machines/engines, parts of pumping devices for elastic fluids, mechanical equipment, etc., and can solve problems such as air flow loss, increased noise, and reduced total pressure of centrifugal fans , to achieve the effect of improving the running noise and reducing the flow loss

Inactive Publication Date: 2017-12-22
魏亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Through the wind field simulation experiment of the centrifugal fan, it is found that during the operation of the existing centrifugal fan, the vortex almost occupies the entire flow channel surface between the centrifugal fan and the volute, and the vortex is mainly distributed at the left and right ends. The existence of the vortex is the main reason for the loss of air flow in the centrifugal fan, and also the main reason for the vortex noise of the centrifugal fan. The macroscopic performance is that the total pressure of the centrifugal fan is reduced, the efficiency of the fan is reduced, and the noise is increased.

Method used

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  • Volute of centrifugal fan and centrifugal fan comprising same
  • Volute of centrifugal fan and centrifugal fan comprising same
  • Volute of centrifugal fan and centrifugal fan comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1, such as figure 1 figure 2As shown, the volute adopts a vortex cutting plate (7) with two equal outer surfaces (702) but unequal widths and an inner surface (701) in the shape of an arc; the contours of both ends of the vortex cutting plate (7) Both are linear; in this plan, the two vortex cutting plates (7) divide the inner side wall of the volute main casing (6) into three equal parts; in this plan, the narrower vortex cutting plate (7) It is mainly used to destroy the large vortex generated during the operation of the centrifugal fan, and the wider vortex cutting plate (7) is mainly used to destroy the smaller vortex generated during the operation of the centrifugal fan.

Embodiment 2

[0041] Example 2, such as image 3 Figure 4 As shown, in this embodiment, the volute adopts the case where the two outer sides (702) are equal in width and equal in size and the inner side (701) is arc-shaped equal-sized vortex cutting plate (7); The two vortex cutting plates (7) divide the inner side wall of the volute main casing (6) into three equal parts.

Embodiment 3

[0042] Example 3, such as Figure 5 Figure 6 As shown, in this embodiment, the volute adopts two equal-width vortex cutting plates (7) whose two outer sides (702) are equal and the inner side (701) is parallel to the outer side (702), and the inner side ( 701) is parallel to the outer surface (702), that is, the width of the vortex cutting plate (7) from the starting end to the end is equal; in the same scheme, the two vortex cutting plates (7) divide the main body of the volute The inner wall of the casing (6) is divided into three equal parts; this solution is mainly aimed at the case of a large centrifugal fan. When the centrifugal fan is large, in order not to make the vortex cutting plate (7) , and reduce its width; in this scheme, the inner surface (701) and the outer surface (702) can also be used, but the width is between the inner surface (701) and the inner surface (701) is arc-shaped and the inner surface (701) and the outer surface (702) between the widths when ...

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Abstract

The invention discloses a volute of a centrifugal fan. According to the volute of the centrifugal fan and the centrifugal fan comprising the same, in order to reduce a large vortex generated in the volute during operation of an existing centrifugal fan, at least one vortex reducing plate is arranged inside the volute, the vortex reducing plates are arranged perpendicular to the side face of the volute of the centrifugal fan or not, and the convex reducing plates comprises flat plates with equal thickness and plates with different thickness; and arcs of the outer sides of the vortex reducing plates are the same as the arc of the inner side of the part, on the installation position of the vortex reducing plates, of the volute, the arcs of the inner sides of the vortex reducing plates comprise circular arcs and non-circular arcs, and circle centers of the circular arcs of the inner sides of the vortex reducing plates are located on an axis of an air inlet of the volute. The large vortexes generated in the volute during operation of the centrifugal fan can be reduced and broken, flow resistance is reduced, the efficiency of the fan is improved, and meanwhile noise caused by the vortexes is reduced.

Description

technical field [0001] The invention belongs to the field of centrifugal fans, in particular to a volute of a centrifugal fan and a centrifugal fan including the volute. Background technique [0002] Through the wind field simulation experiment of the centrifugal fan, it is found that during the operation of the existing centrifugal fan, the vortex almost occupies the entire flow channel surface between the centrifugal fan and the volute, and the vortex is mainly distributed at the left and right ends. The existence of the vortex is the main reason for the loss of air flow in the centrifugal fan, and also the main reason for the vortex noise of the centrifugal fan. The macroscopic performance is that the total pressure of the centrifugal fan is reduced, the efficiency of the fan is reduced, and the noise is increased. Contents of the invention [0003] In order to reduce the large vortex generated in the volute of the existing centrifugal fan, the invention provides a volu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42F04D29/66
CPCF04D29/4226F04D29/667
Inventor 魏亮
Owner 魏亮