JPS59144336A - Outer fan type rotary electric machine with air cooler - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency by equalizing the outer diameter of approx. 3/4 or larger of the outer periphery of an outer fan cover to the outer diameter of a motor body, and gradually increasing the axial size of a vent passage between the outer fan and the outer fan cover in a rotating direction. CONSTITUTION:The size of the outer diameter of approx. 3/4 of the outer periphery of an outer fan cover 45 for covering the outer fan 3 is equalized to the outer diameter of a motor body, and the axial size of a vent passage 46 between the outer fan 3 and the cover 45 is gradually increased. Thus, an air guide 47 is sequentially moved toward the rotating shaft direction in a direction of an arrow A, thereby increasing the size W1 to W3. An exhaust port 45b is formed at the remaining 1/4 part of the outer periphery, and air is fed to a heat exchanger (not shown). An air suction hole 45a is formed on the side face of the cover 45. In this manner, the air resistance of the vent passage is reduced to improve the efficiency of the outer fan 3 and to reduce the size of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an external fan-shaped rotating electrical machine with an air cooler that is capable of improving the fan efficiency of the external fan.

A conventional example of an external fan-shaped rotating electrical machine with an air cooler will be explained based on FIGS. 1 and 2. Referring to these figures, a centrifugal outer fan 8 is fixed to the end of the rotating shaft 2 protruding from the end face of the electric machine body 1, and cooling air from the outer fan 8 flows through the inside of the electric machine body 1. A box-shaped air cooler 4 for cooling air is attached to the outer periphery of the electric machine body 1. The outer fan cover 6 that surrounds the outer fan 8 is provided with an intake port 5a on a side surface, and a discharge port 5b for feeding cooling air toward the air cooler 4 on a part of the outer periphery.

In such a structure, the ventilation passage 6 formed between the outer periphery of the outer fan cover 5 and the outer fan cover 5 has the same cross-sectional area over approximately half the circumference of the outer fan cover 5, so the ventilation resistance is large, which reduces the fan efficiency. The disadvantage was that it decreased. If a spiral air guide 86 shown in FIG. 8 is used to reduce the ventilation resistance of the ventilation path 6, the outer diameter of the outer fan cover 5 will increase, resulting in an increase in the size of the electric machine, or the outer diameter of the outer fan 8 will increase. There was a drawback that if the value of the fan was made smaller, the fan effect would be reduced.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide an outer fan-shaped rotating electrical machine with an air cooler that can improve the fan efficiency of the outer fan without increasing the outer diameter.

Hereinafter, embodiments of the invention will be described based on the drawings.

FIG. 4 shows the main parts of an external fan-shaped rotating electric machine with an air cooler according to the present invention, and the same parts as in FIGS. 1 to 3 are denoted by the same reference numerals. The rotating military aircraft in this diagram is
The outer diameter of approximately 8/4 or more of the outer circumference of the outer fan cover 45 surrounding the outer fan 8 is formed to have substantially the same size as the outer diameter of the electric machine main body 1, and the remaining outer circumference is provided with a discharge port 45b. An air intake port 45& is provided on the side surface of the outer fan cover 45, and an air kite 47 that gradually increases the dimensions W1 to W8 in the direction of the side plate in the direction of rotation is attached integrally with the outer fan cover 45 at an angle. The air guide 47 is formed such that its inner circumference follows the outer circumference of the suction pipe 45d of the intake port 45a. A tongue end piece 458 is provided at the entrance of the ventilation passage 46 to maintain an appropriate gap with the outer periphery of the outer fan 8 and to reduce the gap at the tip end.

According to the above-mentioned embodiment, ventilation provided with the tongue end piece 456 As described above, according to the present invention, in the external fan-shaped rotating electric machine with an air cooler, the outer diameter of the outer fan cover is approximately 8/4 or more of the outer circumference. It is formed with almost the same dimensions as the outer diameter of the electric machine body, and
The axial dimension of the ventilation passage between the outer fan and the outer fan cover is gradually increased in the rotational direction, and a cooling air outlet is provided on the outer periphery of the remaining outer fan cover, so that the cross-sectional area of the ventilation passage is increased. By gradually increasing the rotation direction, the ventilation resistance is reduced, and this has the effect of improving the fan efficiency of the outside fan and making it possible to downsize the electric machine.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical cross-sectional view showing a conventional external fan-shaped rotating electric machine with an air cooler, Fig. 2 is a longitudinal cross-sectional view taken along line T in Fig. 1, and Fig. 3 is a schematic diagram showing another conventional example. FIG. 4 is a longitudinal sectional view showing the main parts of the external fan-shaped rotating electrical machine with an air cooler according to the present invention, and FIGS. 9 to 7 are A-0 in FIG. 4, respectively.
FIG. DESCRIPTION OF SYMBOLS 1...Electric machine body, 8...Outside fan, 4...Air cooler, 45...Outside fan cover, 45b...Discharge port, 46...
...Ventilation duct. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1) An external air cooler with an external fan that sends cooling air from a part of the outer periphery of the outer fan cover that surrounds the centrifugal outer fan toward the air cooler provided on the outer periphery of the electric machine body. In a fan-shaped rotating electric machine, approximately 8/8 of the outer circumference of the outer fan cover
4 or more with an outer diameter that is approximately the same as the outer diameter of the electric machine main body, and the axial dimension of the ventilation passage between the outer fan and the outer fan cover is gradually increased in the rotation direction to gradually increase the cross-sectional area, An external fan-shaped rotating electric machine with an air cooler, characterized in that a cooling air outlet is provided on the outer periphery of the remaining external fan cover.