Denoising volute for enlarging outlet area of centrifugal fan

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...

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 and the air duct inlet, which not only increases the flow loss. , and will cause an increase in noise

Especially when the space size of the entire air duct system is limited, the extra connecting pipes will cause great inconvenience to the layout of the pipe network; It will cause excessive flow loss and increased noise.

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