Single-sided air intake and two-direction multi-blade centrifugal fan impeller

Abstract

The invention discloses a single-sided air intake and two-direction multi-blade centrifugal fan impeller. The single-sided air intake and two-direction multi-blade centrifugal fan impeller comprises awheel disc, a lower layer blade, an upper layer blade, a first wheel cover, a second wheel cover and a third wheel cover located on the wheel disc, wherein, the first wheel cover, the lower layer blade, the second wheel cover, the upper layer blade are the third wheel cover are distributed in sequence from top to bottom, blades in the lower layer blade are arranged in the circumferential direction, blades in the upper layer blade are arranged in the circumferential direction, and the upper layer blade and the lower layer blade are symmetrically distributed in the radial direction; and the inlet mounting angle beta1 of the upper layer blade is 70-90 degrees, the outlet mounting angle beta2 of the lower layer blade is 150-180 degrees, each blade in the upper layer blade is the front bend blade, each blade in the lower layer blade is the back bend blade, and the height ratio K of the upper layer blade to the lower layer blade is 0.6:1. The single-sided air intake and two-direction multi-blade centrifugal fan impeller has the characteristics that the structure is simple, the air volume of a multi-blade centrifugal fan can be effectively, and the pressure pulsation of the blade surfaceand the vortex noise of the blade channel 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 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 bidirectional 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 fans ha...

AI Technical Summary

Problems solved by technology

The air volume of this kind of blade impeller is small, the pressure coefficient is low, the pressure under the same conditions can only be achieved by high speed or large impeller diameter, and increasing the diameter of the impeller will be limited by space, increasing the speed will increase 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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