Cooling fan for engine of motor train unit

Abstract

The invention provides a cooling fan for an engine of a motor train unit. A method for combining a traditional one-dimensional heating power design with three-dimensional numerical simulation is adopted to perform the pneumatic design for an impeller of a centrifugal cooling fan for the engine of the motor train unit; the cooling fan for the engine of the motor train unit mainly consists of an impeller and a casing, wherein the impeller is a main part of a centrifugal fan, and the impeller adopts an inclined wheel disc, so that the consideration is given to high flow and high full pressure, the streamline form in the impeller is more accordant with the flowing characteristics, and the flowing loss is reduced; an inlet fairing is additionally mounted on a wheel hub, so that the air flowing condition in an inlet of the impeller is improved, and the noise of the fan caused by the inlet impact is reduced; and the increment of the blade length is equal to increase the effective acting area of single blade, so that the number of blades is decreased, the cascade solidity is decreased, and the impeller machining difficulty is reduced. Compared with an import fan with the same type, the fan is largely improved in performance; and under the conditions of invariable shape and size and reduced rotating speed by 25.5%, the full pressure is increased by 11.8%.

Description

technical field [0001] The invention relates to the field of machinery and control, in particular to a cooling fan for an engine of an EMU. Background technique [0002] With the development of my country's railway electrification line construction and the increase of train speed, EMUs have gradually become the main traction power and transportation means in my country. The EMU is a power dispersion technology. It is not only driven by the locomotive, but also powered by the car itself, which can achieve high-speed results. Due to the advantages of good safety performance, large transport capacity, no need to turn the head of the car back and forth, low pollution, energy saving, and self-powered power, the EMUs are favored by domestic and foreign markets. The cooling fan for the engine of the EMU is an important part of the EMU. Generally, each EMU is equipped with four traction centrifugal cooling fans and two composite axial flow cooling fans. The EMU cooling fan require...

AI Technical Summary

Problems solved by technology

In the case of providing high total pressure and large flow, the present invention overcomes the defects of low operating efficiency and high energy consumption of the traditional fan at the large flow working point, and further improves the aerodynamic efficiency, device efficiency and use efficiency of the fan to reduce its consumption The proportion of the power in the auxiliary power of the locomotive improves the overall operating efficiency of the locomotive