Low noise axial fan with rotary deflecting ring

Abstract

The invention relates to a low noise axial fan with rotating flow guide ring, comprising electric machine, vane, machine casing, bracket and wheel hub, where the wheel hub is arranged at the lower part of the machine casing, the electric machine is arranged above the wheel hub and coaxially connected with the wheel hub and fixed on the inner surface of the machine casing, the section of the bracket is streamlined, the vane is of an integral fixed vane angle profile and of a forward-swept shape, wide outside and narrow inside, and these vanes are not equidistantly arranged, and the link line of gravity centers of various sections of the vane forms an included angle <=30 deg. with its radial straight line. The lower inlet end of the machine casing is provided with rotating flow guide ring rotating with the vanes, the upper cylinder body of the flow guide ring is integrated with the vane circumference, and keeps a rotating gap from the inner diameter of the machine casing, a bottom circular arc flow guide ring is of a 1 / 4 ellipse in shape, and the lower annular end surface of the machine casing is arranged in the flow guide ring and forms an axial gap from a platform in the flow guide ring to be good for relatively rotating. The invention has remarkable noise-reducing and energy-saving effects.

Description

technical field [0001] The invention relates to an axial flow fan, in particular to a low-noise axial flow fan with a rotating guide ring, which is applied to a train air conditioner condenser and 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. The train air conditioner is an important facility on the rail transit train. The train air-conditioning device for urban rail transit requires compact size ...

AI Technical Summary

Problems solved by technology

The train air-conditioning device for urban rail transit requires compact size and low noise, but the inlet of the fan in service is in the shape of a sudden contraction, and there is a serious disadvantage of eddy current at the suction end. Therefore, a higher technology is proposed for the axial flow fan used in the air-conditioning condenser Require

[0003] The most representative of the train air conditioner condenser fans currently used is the train air conditioner condenser fan imported from Germany in service. Its sound pressure level is relatively high. Relatively high, there is a disadvantage of serious noise pollution

Therefore, in the whole process of vehicle operation, as long as the air conditioning and refrigeration system is running, the noise pollution will continue to exist, seriously affecting the comfort of passengers

In addition, the motor bracket is close to the fan impeller, and the eddy current generated when the airflow flows around will affect the working ability of the impeller.

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