A diffuser and motor for centrifugal ventilation equipment

Abstract

The invention relates to the technical field of centrifugal ventilation equipment, and particularly to a diffuser used for the centrifugal ventilation equipment. The diffuser used for the centrifugal ventilation equipment comprises a diffuser main body, wherein multiple flow guide vanes are arranged on the upper end face of the diffuser main body; a circumferential locating ring is connected to the periphery of the diffuser main body in a sleeved manner; a gap exists between the circumferential locating ring and the diffuser main body; a noise reduction groove is formed in the outer sidewall of the gap; the noise reduction groove extends from the upper end face of the circumferential locating ring to the lower end face of the circumferential locating ring, and has the depth of quarter-wavelength of the noise which needs noise reduction. The invention also provides a motor which comprises an impeller outer cover and the diffuser, wherein the outer sidewall of the circumferential locating ring in the diffuser is attached to the inner sidewall of the impeller outer cover; the noise reduction groove in the diffuser and the inner sidewall of the impeller outer cover form a noise reduction cavity with an opening in the upper end. According to the quarter-wavelength pipe noise reduction principle, the purpose of reducing impeller passing frequency discrete noise in aerodynamic noise of a traditional centrifugal ventilator is realized.

Description

technical field [0001] The invention relates to the technical field of centrifugal ventilation equipment, in particular to a diffuser and a motor for centrifugal ventilation equipment. Background technique [0002] The parts of the general existing centrifugal ventilation motor (vacuum cleaner motor) mainly include impeller housing, impeller, diffuser, bearing frame, stator, rotor, motor housing and so on. The high-speed centrifugal ventilation motor has a lot of noise, generally at 95dB, and noise has always been one of the problems to be solved urgently for vacuum cleaners; its noise is mainly divided into aerodynamic noise, mechanical noise and electromagnetic noise; and the aerodynamic noise generated by the centrifugal fan due to the rotation of the impeller Much larger than electromagnetic noise and mechanical noise, it is the main noise. It is usually difficult to reduce the aerodynamic noise of the centrifugal fan under the same output power, and the noise reduction...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention proposes a diffuser for centrifugal ventilation equipment, which is used in conjunction with the impeller cover, and uses the principle of pipeline noise reduction to solve how to reduce the passing frequency of the impeller in the aerodynamic noise of the traditional centrifugal fan. The Problem with Discrete Noise

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