JPS62239838A - Rotor with air duct - Google Patents

Abstract

PURPOSE:To enable a device to be uniformly cooled, by providing axis- directional ventilation flues formed between the adjacent core brackets of a spider type rotary shaft, with axis-directional regulating plates for regulating the distribution of air quantity flowing into a plurality of air ducts. CONSTITUTION:On the outer periphery of a rotary shaft 1, rotor cores 3a having a plurality of air ducts 4 via radial brackets 2 are fitted, and axis-directional ventilation passageways 10 between adjacent brackets 2 are provided with axis-directional air guides (regulating plates)11 dividing the passageways 10 into two properly in the diameter direction. The air guides 11 are formed in a concentric-circular shape together with the rotary shaft 1 between the external sector 9 side end surfaces of the brackets 2 and the almost central sections of the rotor cores 3a. As a result, the distribution of air quantity flowing into the air ducts can be regulated, and the internal section of the main unit of the external sector type rotary electric machine of internal air circulating type can be uniformly cooled.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to a rotor with an air duct for an external fan-shaped rotating electric machine, and a method for uniformly cooling the inside of the electric machine body by adjusting the distribution of the amount of air flowing into the air duct. Concerning what has been made possible.

[Prior art and its problems]

A conventional example of an external fan-shaped rotating electric machine using a rotor with an air duct will be explained based on FIG. This figure shows the basic configuration of the internal air circulation type.
As shown enlarged in the figure, a plurality of axially long support arms 2 are radially fixed by welding or the like, and a squirrel cage rotor 3 is fitted around the outer periphery of the support arms 2. A bar conductor 3b is inserted into a groove on the outer periphery (not shown) of the rotor core 3a, and a plurality of radial air ducts 4 are provided by inserting a plurality of spacing pieces (not shown) radially at appropriate positions in the axial direction. There is.

The stator 5 that surrounds the rotor 3 also has an air duct 6 radially opposed to the air duct 4 provided in the iron core part. is fixed inside. An axial type inner fan 8 is fixed to the rotating shaft 1 adjacent to both ends of the support arm 2, and a centrifugal type outer fan 9 is attached to one end protruding from the electric machine body.
is fixed.

The inside air of the rotating electrical machine is drawn into the axial direction formed between both ends of the stator 5 and the adjacent support arms 2 by the fan action of the inner fan 8, the bar conductor 3b, and the spacing piece (not shown) as the rotating shaft 1 rotates. The air circulates uniformly from the air passage 10 to the left and right in the axial direction as shown by the dotted arrows through the radial air ducts 4 and 6.
This cools the inside of the rotor core 3a, the conductor 3b, and the stator 5 surrounding them.

The inside air whose temperature has increased due to this cooling is cooled by exchanging heat with the cooling air passing through the outer circumference of the frame 7 as shown by the solid arrow by the action of the outside fan 9.

In such a structure, the temperature of the cooling air from the external fan 9 rises while passing through the outer periphery of the frame 7, making it impossible to uniformly cool the inside air on both sides. The drawback was that it could not be done.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a rotor with an air duct that can adjust the distribution of the amount of air flowing into the air duct.

[Key points of the invention]

In order to achieve the above object, the present invention has an axial air passage formed between adjacent core support arms of a spider-shaped rotating shaft to adjust the distribution of the amount of air flowing into a plurality of core air ducts. An adjustment plate is provided.

[Embodiments of the invention]

FIG. 1 and FIG. 2 show an embodiment of this invention.
Components designated by the same reference numerals as in FIGS. 5 to 7 are the same parts. In these figures, a rotor core 3a having a plurality of air ducts 4 is fitted around the outer periphery of a rotating shaft 1 via radial support arms 2, and an axial air passage 1 is formed between adjacent support arms 2.
0 is provided with an axial air guide (adjustment plate) 11 that appropriately divides it into two in the radial direction. This air guide 11
is formed in the shape of an arc concentric with the rotating shaft 1 from the end surface of the support arm 2 on the side of the outer fan 9 described in the conventional example to approximately the center of the rotor core 3a.

According to the embodiment, the inner fan 8 described in the conventional example on the outer fan 9 side
The inside air sent into the ventilation path 10 is divided by the air guide 11, and the amount of air flowing into the air duct 4 on the side of the outer fan 9 is reduced, and the amount of air flowing into the air duct 4 on the side opposite to the outer fan 9 is increased accordingly. By increasing the cooling effect of the rotor 3 and the stator 5 surrounding the rotor 3 on the side opposite to the outer fan 9, it is possible to uniformly cool the inside of the main body of the inner air circulation type outer fan-shaped rotating electric machine.

In FIGS. 3 and 4 showing the embodiment of the pond, an axial closing plate (adjusting plate) 31 that partially closes the air duct 4 on the side of the outer fan 9 is installed in the ventilation passage 10 inside the rotor core 3a. Zhou Q
This is fixed by welding or the like. According to this embodiment, the ventilation resistance of the air duct 4 on the side of the outer fan 9 increases and the amount of air flowing in decreases, and the amount of air flowing into the air duct 4 on the side opposite to the outer fan 9 increases accordingly.

〔Effect of the invention〕

This invention relates to a rotor with an air duct, in which an axial air passage is formed between adjacent iron core support arms of a spider-shaped rotating shaft, and an axial air passage for adjusting the distribution of the amount of air flowing into a plurality of air ducts. In order to install an adjustment plate for the strainer 1,
Using this rotor, for example, in an internal air circulation type external fan-shaped rotating electric machine, it is possible to uniformly cool the inside of the main body.

[Brief explanation of drawings]

Fig. Si51 is an R sectional view of an embodiment of the present invention, Fig. 2 is a longitudinal sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a longitudinal sectional view of another embodiment of the invention, and Fig. 4 is an RLi plane view along the IV-IV line in Fig. 3, Fig. 5 is a basic configuration diagram of the conventional example, and Fig. 6 is
5 is an enlarged vertical cross-sectional view of the main part of FIG. 5, and FIG. 7 is a vertical cross-sectional view of No. 61 along the line ˜'u-vn. 1... Rotating shaft, 2... Support arm, 3... Rotor, 3a
...Rotor core, 4...Air duct, 10...Air passage, 11°31..., Ij1 adjustment plate.
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：゛：Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 6shi1 Figure 7

Claims (1)

[Claims] 1) A rotor core having a plurality of radial air ducts is fitted to the outer periphery of the rotating shaft via axially long radial support arms, and the air ducts are connected to the axial air passages formed between adjacent support arms. A rotor with an air duct, characterized in that it is provided with an axial adjustment plate that adjusts the distribution of the amount of air flowing into the rotor.