Outer rotor permanent magnet motor multi-stage impeller axial flow ventilating device

Abstract

The invention provides an outer rotor permanent magnet motor multi-stage impeller axial flow ventilating device which is composed of a rectifying cylinder, a front machine base, a rear machine base, amiddle wind cylinder and an outer rotor permanent magnet motor. The rectifying cylinder and the front machine base are fixedly connected. The front machine base and the middle wind cylinder are fixedly connected. The middle wind cylinder and the rear machine base are fixedly connected. The front machine base and the rear machine base are used for fixing the outer rotor permanent magnet motor multi-stage impeller axial flow ventilating device and a foundation. A front supporting disc is arranged at the front end of a motor shaft of the outer rotor permanent magnet motor. A front supporting piece is arranged on the front supporting disc. A rear supporting disc is arranged at the rear end of the motor shaft of the outer motor permanent magnet motor. A rear supporting piece is arranged on therear supporting disc. The outer rotor permanent magnet motor is fixed into the wind cylinder through the front supporting piece and the rear supporting piece. Multiple stages of impellers are installed on a motor outer cylinder of the outer rotor permanent magnet motor in series and rotate along with the motor outer cylinder to generate wind flow. A plurality of guide blades are arranged on the inner wall of the middle wind cylinder. On the condition of the same machine base, by increasing or decreasing the stage number of the impellers, more axial flow ventilators with different powers, windcapacities and wind pressures can be combined.

Description

technical field [0001] The invention relates to an axial flow ventilation device, in particular to an axial flow ventilation device of a series-connected multi-stage impeller outer rotor permanent magnet motor. Background technique [0002] The mine ventilation system is an important part of the mine and tunnel excavation, and it is the basic guarantee for the safe production of the mine. The function of the local fan ventilator is to continuously transport fresh air to the underground and tunnel face, dilute and remove harmful gases and dust. The health and safety of workers. [0003] Traditional local fans generally use axial flow fans. In order to obtain larger air volume and air pressure, 2-pole motors and counter-rotation methods are generally used. The resulting noise is as high as 100-120 decibels, which greatly exceeds the national standard. Affect the physical and mental health of workers. To this end, various manufacturers have taken some noise reduction measures...

AI Technical Summary

Problems solved by technology

[0003] Traditional local fans generally use axial flow fans. In order to obtain larger air volume and air pressure, 2-pole motors and counter-rotating methods are generally used. The resulting noise is as high as 100-120 decibels, which greatly exceeds the national standard and seriously Affect the physical and mental health of workers

To this end, various manufacturers have taken some noise reduction measures and added auxiliary facilities such as: noise reduction devices (diffusion cylinders, mufflers and diffusion towers) and sound-absorbing cotton, etc., which not only result in bulky volume, but also due to the dust attached to the sound-absorbing cotton, Sound-absorbing materials fail within a year, or even a few months

[0004] In addition, for the counter-rotating axial flow fan, because the two-stage impellers of the counter-rotating fan are very close, and they rotate in the opposite direction at a relatively high speed (2950r / min), the relative linear velocity is very large, which greatly deteriorates the noise characteristics of the fan. , the noise is very high; and the power and efficiency of the front and rear fans are difficult to design and match, and the power of the rear fan is often large, resulting in the phenomenon of burning the motor

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