Denoising volute for enlarging outlet area of centrifugal fan

An outlet area, centrifugal fan technology, applied in the components of the pumping device for elastic fluids, mechanical equipment, machines/engines, etc., can solve the problems of increased flow loss, large flow loss, inconvenient pipe network, etc. Small size, reduced fan noise, and easy layout

Active Publication Date: 2015-04-29
滁州熙诚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, there are often cases where the opening of the fan outlet is smaller than the corresponding length of the air duct, and the area of ​​the volute outlet is smaller than the area of ​​the air duct inlet. It is necessary to use an additional connecting pipe to connect the volute outlet a

Method used

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  • Denoising volute for enlarging outlet area of centrifugal fan
  • Denoising volute for enlarging outlet area of centrifugal fan
  • Denoising volute for enlarging outlet area of centrifugal fan

Examples

Experimental program
Comparison scheme
Effect test

Example

[0018] Test plan one (traditional structure fan):

[0019] According to the 6-31 fan aerodynamics sketch, the fan model with a modelling ratio of 8, the fan outlet is connected to the additional connecting pipe 6, the connecting pipe inlet matches the fan outlet (width W is 412.8mm), and the connecting pipe outlet The width L is 600mm, and the expansion angle α of the connecting pipe is 120°. The results are shown in Table 1.

Example

[0020] Test plan two (the structure fan of the present invention)

[0021] Based on the fan model with a modelling ratio of 8 based on the 6-31 fan aerodynamic sketch, keep the volute tongue, the first arc, the second arc, and the third arc unchanged. The opening tangent point and the inclined outlet straight section are structured to increase the volute outlet (width L), so that the inclined outlet section has a straight line deflection angle β of 16.7° in the opposite direction of the air flow. The results are listed in Table 1.

[0022] Table 1

[0023] Test program

[0024] From the comparison data in Table 1, it can be seen that the volute after the fan outlet optimized by the present invention is compared with the traditional volute with additional connecting pipes, the fan's full pressure and efficiency are improved, and the fan noise is also reduced. Therefore, the present invention solves the technical problem to be solved by the present invention on the basis of ensurin...

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Abstract

The invention discloses a denoising volute for enlarging the outlet area of a centrifugal fan. The denoising volute comprises a volute tongue, a first arc section, a second arc section, a third arc section, a fourth arc section and an outlet line section which are in smooth connection. The denoising volute is characterized in that on the basis of the four approximate helix arc sections made by a traditional inequilateral base method, the fourth arc section is opened in advance, the tangent outlet line section inclines towards the reverse direction of airflow circling as compared with a traditional design scheme, the width in the radial direction of a line opening of the volute is larger than that of the opening of the conventional volute, and the increase ratio is up to 45.3%. Due to the fact that the outlet area of the centrifugal fan is effectively increased under the condition that aerodynamic performance of the fan is unaffected, the outlet of the centrifugal fan can be better connected with a pipe network, and noise of the centrifugal fan is lowered to some extent.

Description

technical field [0001] The invention relates to a volute structure of a centrifugal fan. Background technique [0002] As one of the main components of the centrifugal fan, the volute is to concentrate and divert the gas leaving the impeller, and convert part of the kinetic energy of the gas into static pressure. The existing centrifugal fan volute is generally designed according to the Archimedes spiral or the logarithmic spiral; in practical applications, it is approximately divided into the first The first arc, the second arc, the third arc, and the fourth arc are smoothly connected between each part. The straight line section of the last outlet of the volute extends after being tangent to the end point of the fourth arc of the volute near 90°, which belongs to the traditional design structure of the centrifugal fan (see figure 1 , figure 2 ). [0003] As a general-purpose machine, centrifugal fans are widely used in ventilation, dust removal and cooling in factories...

Claims

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Application Information

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IPC IPC(8): F04D29/42F04D29/66
CPCF04D29/4226F04D29/663
Inventor 李景银陈聪聪耿文倩
Owner 滁州熙诚环保科技有限公司
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