Motor fan housing

Abstract

The invention provides a motor fan housing which is arranged at a rear end cover of a motor. A plurality of lugs are uniformly distributed on the outer circumference of the rear end cover. The motor fan housing includes a fan housing cylinder. A circular truncated cone shaped deflector shield is coaxially arranged in the fan housing cylinder. The large-diameter end of the deflector shield is connected with the rear end of the fan housing cylinder. A fan is coaxially arranged in the deflector shield, and the rotating shaft of the fan is coaxially connected with the motor shaft. The front end of the fan housing cylinder is coaxially sleeved with a flange which is fixedly connected with the outer circumference of the fan housing cylinder. The front end face of the flange is adhered to the rear end faces of the lugs, and the flange and the lugs are connected through rabbet fit. The coaxiality between the fan housing cylinder and the fan is ensured. Vortex flow is avoided. The efficiency of the fan is improved. The motor cooling capacity is improved. The ventilation noise is reduced.

Description

technical field [0001] The invention belongs to the technical field of motor wind shields, and in particular relates to a motor wind shield. Background technique [0002] The cooling method is the cylindrical motor with IC411 structure (fully enclosed, self-contained fan cooling), the rear end of the rotating shaft of the motor is equipped with an external fan, and the outer fan is equipped with a windshield connected with the rear end cover of the motor , to form an external air path that flows from the back to the front. When the external air path flows through the surface of the motor frame, it takes away the surface heat to achieve the effect of cooling the motor. Common hoods are mainly composed of hood tubes, suction nozzles, and net windows, such as figure 1 As shown, the rear end of the windshield tube 1 is provided with a rear side wall, and a suction port is coaxially provided on the rear side wall, and a suction nozzle is coaxially arranged in the suction port; t...

AI Technical Summary

Problems solved by technology

Obviously, in the current windshield structure, even if the interference between the suction nozzle and the fan blade is avoided, the result of low coaxiality accuracy between the two cannot be avoided

The coaxiality accuracy of the fan and the suction nozzle is low. When the motor is running, the fan rotates, which will form eddy currents, resulting in low fan efficiency, affecting the cooling and heat dissipation of the motor, and aggravating the eddy current noise of the ventilation.

And for this windshield structure, when the fan rotates with the motor shaft, the wind enters the windshield from the rear end, part of the wind flows out from the front end of the windshield tube, and then flows through the cooling fins on the surface of the machine base to cool the motor, and the other part of the wind is It will circulate inside the windshield, forming a vortex, causing losses, resulting in low fan efficiency and loud ventilation noise

[0005] In short, due to the unreasonable connection between the current windshield structure and the rear end cover of the motor, and the unstable structure of the windshield itself, there are disadvantages such as low ventilation efficiency, large ventilation noise, and easy interference with the fan.

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