Single impellor axial fan of traction electric machine brake cooling system

Abstract

The invention relates to a single-impeller axial fan in a dragging electric machine brake cooling system, replacing the two-stage impeller series operating structure with a single-impeller structure added with front guide vane, adopting a technical solution of front guide vane + impeller + rear guide vane, adding a reverse guide vane in front of the impeller, then changing axial support plate of the electric machine into streamlined guide plate designed according to air flow direction and improving vane profile design for the impeller, where the vane is wide outside and narrow inside and of a bent-swept combined shape, and the vanes are not equidistantly arranged. For improving flow field, it can further install the electric machine on the end cover of an inner cylinder body and the inner cylinder body is connected with the machine casing through the rear guide vane. As the fan runs, the air is pre-rotated through the reverse front guide vane and then flows into the impeller, thus improving work doing ability of the impeller, and the novel streamlined electric machine support plate and vane can improve fan operating conditions, raise fan efficiency, reduce air flow separation and save energy and reduce noises by a larger margin.

Description

technical field [0001] The invention relates to an axial flow fan, in particular to a single impeller axial flow fan of a traction motor brake cooling system, which belongs to the technical field of fluid engineering. Background technique [0002] With the rapid development of the country's economic construction, urban rail transit is playing a very important role as a city's transportation hub. At present, urban rail transit is developing vigorously and has entered a new period of development. It has become a key project in many cities . Huge construction funds have become a major bottleneck in the development of urban rail transit. The primary problem before us is to adopt domestic technology and equipment, reduce project costs, and promote the rapid development of urban rail transit. [0003] In the brake cooling system of the subway traction motor, the axial flow fan is used as the cooling air source. Due to the compact size of the locomotive, the space for installing ...

AI Technical Summary

Problems solved by technology

The fan with this structure has the disadvantage of high noise

Since the motor is installed between the two impellers, the axial arrangement of the support plate of the motor support will interfere with the airflow, resulting in air separation when the airflow flows around the support plate, and a large vortex area will be formed on the back of the support plate, which will not only It affects the additional resistance, and also seriously affects the working ability of the rear impeller, which eventually leads to the wind pressure generated by the front and rear two-stage impellers being lower than twice the wind pressure generated by the single-stage impeller, while the noise increase is greater than 3dB(A)

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