A compact wide-chord high-head small-flow axial flow cooling fan for motors

Abstract

The invention relates to a compact axial-flow cooling fan for a small-flow motor with a wide chord and high pressure head, which includes a blade, a hub and a casing; The smooth transition between the blade and the small-diameter end is adopted; the blade is a blade with a wide chord and a large turning angle; the casing is a hollow columnar body, and the inner wall is stepped, and the plane formed by the circumferential rotation of the blade is located in the cavity of the large-diameter end; the blade Facing the heating area of ​​the external generator, the airflow enters the heating area through the rotating blades to dissipate heat for the generator. The invention adopts the expanded meridian flow channel, which improves the fan's ability to work on the air flow; the blade adopts the bending and twisting orthogonal design method, and adopts the design means of wide chord, large turning angle and large consistency, which can effectively resist the relatively large reverse flow in the fan flow channel. The pressure gradient can avoid the separation of the boundary layer on the blade surface and improve the cooling effect of the fan. The stepped casing improves the heat dissipation efficiency of the fan and saves processing costs.

Description

technical field [0001] The invention relates to a small-flow high-pressure-head axial-flow fan used for cooling high-power-density motors, which is installed on the main shaft of a generator to dissipate heat and cool the heating parts of the generator, and is especially suitable for high-power generators with compact spaces in the aviation field. Background technique [0002] The kinetic energy of the generator rotor is converted into magnetic field energy storage increment, heat loss and electrical energy. There are four sources of heat generation. The basic copper loss refers to the heat generated by the resistance of the winding coil; the iron loss refers to the magnetic energy loss of the alternating magnetic field; mechanical friction, such as heat generated by bearings; and built-in rectifier diodes generate heat. The internal air flow channel of the motor is narrow, if the cooling of the motor is insufficient, the heat of the motor will accumulate and the temperature...

AI Technical Summary

Problems solved by technology

For simple casings, in order to control the processing cost, the gap between the blades and the casing is usually large. When the wind pressure of the fan is high, the pressure difference between the suction and pressure surfaces of the rotating blades is very large, resulting in serious leakage losses, and the leakage vortex is reduced. Fan efficiency, reduced fan stability margin and pressure rise capability

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