Bidirectional diffusion centrifugal fan

Abstract

The invention relates to a bidirectional diffusion centrifugal fan which comprises a volute assembly, an impeller assembly, an inlet air collector, a spindle nose stop device, a motor, a shock pad and a junction box device, wherein the impeller assembly is of a long-short blade combined structure, an outlet is of a bidirectional diffusion structure; the bidirectional diffusion centrifugal fan is used for reducing the annular flowing loss and airflow separation and improving the lifting capacity of an output pressure of impellers. The rapid diffusion of a high-speed airflow at the outlet of a blade is effectively reduced, the speed of the airflow at the outlet is stably reduced, and further the outlet pressure is increased and the formation of irregular eddy currents is reduced; a volute tongue of a volute is of an inclined volute tongue structure, so that the overlapping of noise fundamental frequencies can be reduced, the rotation noise is diffused, and the low-noise requirement can be kept. Meanwhile, the shock pad on an installing frame of the volute assembly plays roles in reducing vibration and isolating vibration. The measures ensures the main characteristics of low noise, small vibration, compact integral structure and stable performance of the bidirectional diffusion centrifugal fan, and thus the requirement of comfort degree of passengers in a motor train unit can be met.

Description

technical field [0001] The invention relates to a two-way diffuser centrifugal fan, which is a two-way diffuser centrifugal fan for cooling the traction motor of an EMU, and belongs to the field of fluid machinery. Background technique [0002] The traction motor is a key component that drives the high-speed operation of the EMU. When the traction motor is working, the internal winding of the motor generates a lot of heat. In order to prevent the traction motor from overheating and damage and ensure the normal operation of the EMU, a fan is required to force the traction motor to dissipate heat, which is an indispensable part of the traction system. [0003] The traction motor cooling centrifugal fan is installed in the mechanical compartment at the lower part of the passenger compartment. In view of the requirements for passenger comfort, the noise level of the sound-generating parts must be controlled below 80dB, otherwise it will cause harm to human health, so it must m...

AI Technical Summary

Problems solved by technology

In order to solve the above problems, it is necessary to develop a traction cooling fan with low noise, low vibration and compact overall structure that meets the requirements of the EMU, and minimize the impact of various derivative factors on passengers during its operation; the existing traction motor cooling centrifugal fan often cannot meet the requirements. Require

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