Centrifugal fan with volute

Abstract

The invention relates to a centrifugal fan with a volute. The centrifugal fan comprises the volute, a volute type line comprises a first spiral line CD1, a second spiral line E1M and a Bezier curve D1E1, the Bezier curve D1E1 is disposed between the first spiral line CD1 and the second spiral line E1M, the first spiral line CD1 is an equiangular spiral line with a constant expansion angle, the second spiral line E1M is a variable-angle spiral line tapering at the expansion angle, and a point D1 and a point E1 of the curve D1E1 are respectively located on the upper side and the lower side of ahorizontal line OH1 passing through a volute center O, the point H1 is a control point used for controlling the bending direction of the curve D1E1, and the control point H1 is located on the curve D1E1. On the one hand, the left and right sizes of the volute are reduced, the smoothness of airflow collection and passing inside the volute is improved, the static pressure of the maximum static pressure and the effective air volume section is improved, the large volute effect is achieved at a small size, and pneumatic noise is reduced; and on the other hand, the Bezier curve is adopted for transition, so that the type line connection is smoother, the separation loss caused by the curvature mutation is reduced, and the aerodynamic noise caused by vortex is reduced.

Description

technical field [0001] The invention relates to a centrifugal fan with a volute, in particular to a centrifugal fan with a volute. Background technique [0002] Household range hoods use centrifugal fans to extract oily air from the kitchen and discharge it to the public flue or directly to the outside. Among them, centrifugal fans are widely used in range hoods due to their advantages of high suction, low noise and compact structure. . The volute is one of the core components of the centrifugal fan. Its function is to concentrate the gas leaving the impeller, export it to the outlet of the volute, and convert the dynamic pressure into static pressure. The volute structure of the existing centrifugal fan includes a volute top plate, a volute bottom plate, and a volute surrounding plate connecting the volute top plate and the volute bottom plate, wherein the volute top plate and the volute bottom plate have the same shape except for the volute tongue. The traditional volute...

AI Technical Summary

Problems solved by technology

The profiled lines of the centrifugal fan volute further reduce the left and right dimensions of the volute, improve the airflow collection inside the volute, and reduce the airflow resistance inside the volute, but the tangent line DE of the volute profile of the centrifugal fan is equivalent to reducing the right side of the volute Partial cuts are made, though, the cut edge DE of the cut may cause problems with airflow not flowing smoothly through the cut edge

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