Fan assembly for vacuum cleaner

Abstract

The present invention relates to a fan assembly for a vacuum cleaner for reducing BPF noises. The fan assembly includes a motor, an impeller having a plurality of impeller blades, the impeller being rotated by the motor to suck air, and a diffuser disposed to wrap around an outer circumference of the impeller, the diffuser having a plurality of diffuser blades arranged in a predetermined interval. A ratio of an exit area of the diffuser to an entrance area of the diffuser is determined to reduce noise generated when the impeller rotates.

Description

REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit under 35 U.S.C. § 119(a) from Korean Patent Application No. 2005-114158 filed on Nov. 28, 2005 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a vacuum cleaner. More particularly, the present invention relates to a fan assembly for a vacuum cleaner. [0004] 1. Description of the Related Art [0005] Generally, a vacuum cleaner is an apparatus that sucks contaminants with air by suction force, and then, separates and collects contaminants from the sucked air using a contaminants collecting apparatus. An example of the vacuum cleaner is shown in FIG. 1. [0006] Referring to FIG. 1, the vacuum cleaner 1 includes a suction brush 2, an extension pipe assembly 3, and a main body 4. [0007] The suction brush 2 is provided with a suction port (not sh...

AI Technical Summary

Benefits of technology

[0010] The present invention has been developed in order to overcome the above drawbacks and other problems associated with the conventional arrangement. An aspect of the present invention is to provide a fan assembly for a vacuum cleaner to reduce noise, especially BPF noises, generated by an impeller. The above aspect and / or other feature of the present invention can substantially be achieved by providing a fan assembly for a vacuum cleaner, which includes a motor; an impeller having a plurality of impeller blades, the impeller being rotated by the motor to suck air, and a diffuser disposed to wrap around an outer circumference of the impeller, the diffuser having a plurality of diffuser blades arranged in a predetermined interval. A ratio of an exit area of the diffuser to an entrance area of the diffuser is determined to reduce noise generated when the impeller rotates.

[0014] The fan assembly for the vacuum cleaner according to an embodiment of the present invention as described above can reduce the BPF noises while minimizing the decrease of suction force.

[0015] Furthermore, with the fan assembly for the vacuum cleaner according to an embodiment of the present invention, it is easy to control a ratio of the diffuser exit area to the diffuser entrance area by controlling the number of the diffuser blades or an inclined angle of an entrance of the diffuser blade.

Problems solved by technology

However, the fan assembly 7 generates a loud noise because the impeller rotates at high speed inside the diffuser 8.

BPF noises do not greatly affect the whole noise level of the vacuum cleaner, but they cause users to feel ill because they are high frequency noises with strong tones.

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