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Volute casing of forward curved multi-blades centrifugal fan

A centrifugal fan and volute technology, applied in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problem of uneven circumferential airflow at the outlet of the guide ring, and achieve the effect of improving fan performance and reducing noise

Inactive Publication Date: 2010-06-02
GUANGDONG SUNWILL PRECISING PLASITC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a volute for a forward multi-blade centrifugal fan, which can not only improve the circumferential unevenness of the air flow at the outlet of the guide ring, but also reduce the problem of the vortex intensity in the area of ​​the impeller near the guide ring, so as to effectively reduce the noise

Method used

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  • Volute casing of forward curved multi-blades centrifugal fan
  • Volute casing of forward curved multi-blades centrifugal fan
  • Volute casing of forward curved multi-blades centrifugal fan

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 2 As shown, the volute of a forward multi-blade centrifugal fan includes a volute 1, a guide ring 3 located on the worm plate 2, and an outlet 2 located on the worm plate. The guide ring 3 is oval-like, and the guide ring 3 The center coincides with the center of the impeller.

[0022] An ellipse whose major semiaxis is on the Y axis and whose minor semiaxis is on the X axis is called a vertical ellipse, otherwise it is called a horizontal ellipse;

Embodiment 2

[0024] Such as image 3 As shown, the guide ring 3 is in the shape of a transverse ellipse.

Embodiment 3

[0026] Such as Figure 4 , Figure 5 As shown, a multi-blade centrifugal fan volute includes a worm plate 1, a guide ring 3 located on the worm plate 2, and an outlet 2 located on the worm plate. The centers coincide. The long semi-axis 5 of the guide ring 3 has an included angle θ with the Y axis, one end of the long semi-axis 5 is close to the outlet 2 area on the snail plate 1, and one end of the short semi-axis 4 is close to the volute tongue 6 area of ​​the snail plate 1; Said, the guide ring 3 is in the shape of a vertical ellipse turning counterclockwise at a certain angle.

[0027] The present invention is a volute of a forward multi-wing fan, the semi-major axis 5 of the guide ring 3 is slightly smaller than the outer radius of the impeller, and the semi-major axis 5 of the guide ring 3 has an included angle θ with the Y axis, and the range is 0 °-30°;

[0028] Or the semi-minor axis 4 of the guide ring 3 is slightly smaller than or equal to the inner radius of th...

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Abstract

The invention relates to a volute casing of a forward curved multi-blades centrifugal fan, comprising a volute plate, a guide ring arranged on the volute plate and an outlet arranged on the volute plate. The volute casing is characterized in that the guide ring is in a like-ellipsoid shape, wherein the short radius of the elliptic guide ring is slightly smaller than or equal to the inner radius of an impeller, and the short radius is close to a volute tongue area. Because the structure of the volute casing can take both the uniformity of inlet air and the vortex intensity of the impeller close to the guide ring into account, the inlet air condition of the volute tongue area is improved, and an area away from the volute tongue and close to the outlet of the volute casing has a better inlet air condition, thus the vortex intensity and fan noise can be reduced. Because the vortex intensity of the impeller close to the guide ring can be reduced and the circumferential uniformity of air flows of an outlet of the guide ring can be improved, through regulating the position of the elliptic guide ring on the circumference of the volute casing, the requirements of effectively reducing the noise and improving the performance of the fan can be conveniently met.

Description

technical field [0001] The invention relates to a forward multi-blade fan, in particular to a volute of a forward multi-blade fan. Background technique [0002] Existing technologies such as figure 1 As shown, a volute of a multi-blade centrifugal fan includes a volute 1 , a guide ring 3 located on the volute 1 and an outlet 2 located on the volute 1 . Generally, the section of the guide ring is circular, and the diameter of the guide ring has three structures. The first structure is less than or equal to the inner diameter of the impeller; the second structure is between the inner diameter and the outer diameter of the impeller; the third structure is greater than or equal to the outer diameter of the impeller. Since the airflow at the outlet of the multi-wing fan guide ring 3 is unevenly distributed in the circumferential direction, the air intake of the impeller is also uneven. The air intake conditions are better in the area far away from the volute tongue and close to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42
Inventor 温选锋杨昕祁大同陈望明
Owner GUANGDONG SUNWILL PRECISING PLASITC CO LTD
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