Volute

Abstract

The invention provides a volute. A molded line of a cavity adopts a log spiral, an included angle formed by a cutting line on an air outlet and a horizontal installation line is larger than or equal to 5 degrees, therefore, out air can be blown to the middle of a heat exchanger, heat exchange is uniform, and integral performance of the product is improved. Furthermore, an included angle formed by a tangent line of an end position of the log spiral at the lower end of the air outlet and the horizontal installation line is larger than or equal to 85 degrees, cutting effect of a volute tongue on high-speed air exhausted by centrifugal fan blade impellers is small, and noise level is lowered. Meanwhile, by changing the position of the volute tongue, air flow is evenly when rotary air supply is performed. Compared with the prior art, blast capacity of the volute is greatly improved by larger than 8%, the air flow is evenly when rotary air supply is performed, and the noise level is remarkably lowered by 2-3db.

Description

technical field [0001] The invention relates to the technical field of ventilation equipment for driving air flow, in particular to a volute used in conjunction with centrifugal fan blades. Background technique [0002] The quality and performance of the volute and centrifugal fan used in ventilation equipment are closely related to the inner cavity profile of the volute and the matching centrifugal fan blade shape. How to design the inner cavity profile of the volute is very important , the design of the inner cavity of the volute in the ideal solution will lead to an increase in the air volume of the ventilation equipment, but a decrease in the noise value. At present, the volute that matches the centrifugal fan blade generally adopts an involute helix as the inner cavity molding line, and the parameters of the helix line used for interception vary widely, resulting in uneven performance. At present, for the volute matched with centrifugal fan blades, the angle between th...

AI Technical Summary

Problems solved by technology

At present, the volute that matches the centrifugal fan blade generally adopts an involute helix in its inner cavity, and the parameters of the helix that are selected for interception vary widely, resulting in uneven performance.

At present, for the volute matched with centrifugal fan blades, the angle between the upper intercept line of the air outlet and the horizontal installation line is usually 0 degrees, and the air outlet cannot blow to the middle of the heat exchanger, resulting in uneven heat transfer; the involute helix at the lower end of the air outlet The angle between the tangent line at the end position and the horizontal installation line is usually less than 85 degrees, so the volute tongue has a strong cutting effect on the high-speed airflow discharged from the centrifugal fan impeller, resulting in a large noise value; Noise value

Therefore, the current volute structure makes the air volume and noise value of the ventilation equipment unsatisfactory, and the efficiency is not good

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