A kind of impeller of single-sided air-intake two-way multi-blade centrifugal fan

Abstract

The invention discloses an impeller of a single-air-inlet bidirectional multi-blade centrifugal fan. The impeller comprises a wheel disc, a lower-layer blade, an upper-layer blade, a first wheel cover, a second wheel cover and a third wheel cover, wherein the lower-layer blade, the upper-layer blade, the first wheel cover, the second wheel cover and the third wheel cover are positioned on the wheel disc; the first wheel cover, the lower-layer blade, the second wheel cover, the upper-layer blade and the third wheel cover are sequentially distributed from top to bottom; various blades in the lower-layer blade are arranged in the circumferential direction; various blades in the upper-layer blade are arranged in the circumferential direction; the upper-layer blade and the lower-layer blade aresymmetrically distributed in the radial direction; an inlet mounting angle beta1 of the upper-layer blade is 70 to 90 degrees, and an outlet mounting angle beta2 of the lower-layer blade is 150 to 180 degrees; the various blades of the upper-layer blade are all of front-bending blades; and the various blades of the lower-layer blade are of back-bending blades. According to the impeller, the air volume of the multi-blade centrifugal fan can be effectively improved, and surface pressure pulsation of the blades and vortex noises of blade channels are reduced.

Description

technical field [0001] The invention belongs to the technical field of bathroom ventilation, and relates to an impeller of a single-sided air-intake bidirectional multi-blade centrifugal fan. Background technique [0002] At present, the performance of the two-way centrifugal fan embedded in the bathroom ventilation device generally has the problem of low performance, which cannot be compared with the one-way fan. Today, the heating and ventilation industry is increasingly miniaturizing products, which has seriously hindered the application and development of positive and negative centrifugal fans in ventilation devices, and it is necessary to improve their performance. At present, the performance of the one-way multi-blade centrifugal fan with the same volume of the wind wheel and the air duct is more than twice that of the two-way. [0003] In view of the characteristics of large flow coefficient, high pressure coefficient and compact structure, multi-blade centrifugal fa...

AI Technical Summary

Problems solved by technology

The air volume of this kind of blade impeller is small, the pressure coefficient is low, and the pressure under the same conditions can only be realized by high speed or large impeller diameter, and increasing the diameter of the impeller is limited by the space, and increasing the speed increases the noise, and In the leaf path of the blade, due to the serious blockage of the flow channel, it is easy to form a vortex, which affects the air output of the fan, and due to the existence of the vortex, the vortex noise of the fan is increased

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