Electric blower and electric duct collector equipped with the same

Abstract

The efficiency improvement and the noise reduce of a blower have a tradeoff selectional relation, thus it is difficult to make them to be coexisted. Therewith, the aim of the invention is to provide an electric blower having a high efficiency and a low noise, and an electric duct collector equipped with the electric blower. By means of setting through holes on most external diameter positions and a rotating center of adjacent diffuser vanes and on a diffuser still foliar in a region encompassed b a fan guard in the blower, the vane sound for dominating the noise of the blower is interfered on the surface and the back face of the foliar to be reduced, and the airflow in the diffuser is rectified in the diffuser by the control of a boundary layer of the through holes, so as to improve the efficiency.

Description

technical field [0001] The present invention relates to an electric blower and an electric vacuum cleaner equipped with the electric blower, and more particularly to a through-hole provided on a blade surface of a diffuser on the outer peripheral side of the blower. Background technique [0002] Large suction power and low noise are important requirements for electric vacuum cleaners. [0003] In order to enhance the suction force under the condition of constant power consumption, the efficiency of the electric vacuum cleaner needs to be improved, and the noise reduction of the electric blower as the sound source is also required to be quiet. Here, the blower includes a rotary centrifugal impeller as a rotor directly driven by a motor, a diffuser and a return guide as a stator. Currently, an electric blower for an electric vacuum cleaner is characterized by adopting a self-cooling method of cooling a motor using airflow generated by the blower itself. [0004] As a measure...

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Problems solved by technology

[0006] However, the above-mentioned series of measures for improving efficiency increase the flow velocity inside the blower, increase the aerodynamic interference force between the moving and stationary blades that become the sound source of the blade sound, and directly emit the noise from the cover to the outside, so the result It is an electric vacuum cleaner that increases the noise of the electric blower and the equipped electric blower

Moreover, in the method of providing holes in the fan cover to release the air flow, the air volume for cooling the motor is insufficient, so there is an added risk that the reliability of the electric blower will decrease.

[0007] On the other hand, in the measure of providing through-holes on the outer diameter side of the diffuser for noise reduction, although blade sound can be suppressed, the leakage air flow on the through-holes hinders the deceleration of the main flow flowing inside the diffuser, thereby reducing the Blower efficiency

[0008] In this way, efficiency improvement and noise reduction have a trade-off relationship, and it is difficult to make them coexist in the prior art

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