Blade wheel structure of multiple wing type centrifugal blower fan

A centrifugal fan, multi-blade technology, used in mechanical equipment, non-variable-capacity pumps, machines/engines, etc., can solve the problem of uneven distribution of outlet speed along the axial direction, and achieve improved fan efficiency and uniform airflow speed distribution. , the effect of simple structure and shape
CN101363450BInactive Publication Date: 2011-06-01XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2011-06-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an impeller structure of a multi-wing centrifugal fan, comprising an impeller consisting of a plurality of aerofoil blades. The impeller structure is characterized in that: the chord length of the blade gradually reduces from the side of an impeller cover to the side of an impeller disk, or the chord length of the blade remains the same while the diameter of the impeller gradually reduces, thus leading to the result that the work capability of the blade along the side of the impeller cover to the side of the impeller disk gradually reduces. The impeller structure improved by the invention leads airflow speed of an outlet of the impeller to be more uniform distribution along the axial direction, reduces the secondary flow in a scroll casing, decreases flow losses, improves fan efficiency and reduces noise level. The impeller structure of the invention is simple in form, convenient in processing and low in manufacturing cost.
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Description

technical field

[0001] The invention relates to an impeller structure of a centrifugal fan, in particular to an impeller structure of a multi-blade centrifugal fan. Background technique

[0002] The multi-blade centrifugal fan has small size, large flow coefficient, high pressure coefficient and low noise, and is widely used in ventilation devices, electronic equipment, air conditioning and other systems. However, the flow loss of this type of fan is large, and the efficiency is generally low.

[0003] At present, multi-blade centrifugal fans mostly adopt the impeller structure of equal-chord straight blades, such as figure 1 As shown, that is, the inlet and outlet edges of the blade are parallel to the rotation axis of the impeller, and the size and shape of each section along the span direction are the same. This type of blade is simple to manufacture and low in production cost. However, due to the different airflow velocities at the blade inlet along the span direction,...

Claims

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