JPS6217463B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved structure of a cooling fan in a rotating electric machine.

2. Description of the Related Art In a conventionally known cooling fan for a rotating electric machine, blades are formed by cutting a metal plate from the outer periphery, as shown in FIG. This type of conventional fan can be made to function as an axial fan that sends air in the axial direction or as a centrifugal fan that sends air in the centrifugal direction by changing the angle of the blades at the folded part. However, when using a mixed flow fan that functions in both directions, sufficient air volume could not be obtained. Furthermore, once the dimensions of the metal plate for the cooling fan are determined, the size of the blades is almost fixed, and as the dimensions of the metal plate for the cooling fan become smaller, the air volume decreases, making it difficult to obtain sufficient air volume for a small, high-output generator. First, it was not possible to obtain a satisfactory result in terms of temperature rise.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of conventional cooling fans, an object of the present invention is to increase cooling air and provide efficient cooling air to the stator coil and rotor using a single cooling fan.

In the present invention, the end surface portion is composed of a single plate-like body having a substantially U-shaped cross section and having a disk-shaped end surface portion and a cylindrical outer diameter portion continuous to the outer periphery of the disk-shaped end surface portion. A plurality of equally spaced and radially formed first parts, each of which is partially cut into a U-shape and bent toward the inner surface.
A plurality of blades having a U-shaped or L-shaped cut in a part of the outer diameter part and bent toward the inner diameter side of the outer diameter part so as to be located in the middle of the first blade. Provided is a cooling fan for a rotating electrical machine, characterized in that the end face of the plate-like body is concentrically attached to the axial end face of the rotor of the rotating electrical machine.

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 2 shows a front view of the cooling fan of the present invention, in which a metal plate 81 serving as a fan substrate has a disk-shaped end face 82 with a hole in the center for passing the shaft 5 of the rotating electric machine, and It has a cylindrical outer diameter part 83 whose outer circumferential part is bent, and has a U-shaped cross section as shown by diagonal lines in FIG. The first blade 84 has a plurality of U-shaped notches radially spaced at equal intervals on the end surface 82 of the metal plate 81, and as shown in FIG. All the notches are raised using the line connecting both ends of the notches as a fulcrum so that they are at the 82'' position.

The first blade 84 has a certain inclination and operates as an axial fan that sends air in the axial direction. The second blade 85 has a plurality of U-shaped cuts in the outer diameter portion 83 of the metal plate 81, and as shown in FIG. All the cut portions are bent at a certain angle in the inner radial direction using the line connecting both ends of the cut as a fulcrum.The position of the second blade 85 is
It is placed between the blades of the fan and acts as a centrifugal fan.

FIG. 5 is a sectional view of a vehicle alternator using a cooling fan according to the present invention. The front end frame 1 and the rear end frame 2 each have a substantially U-shaped cross section, and a stator 3
It is fixed with screw bolt 4. A rotor 6 is connected to the shaft 5 inside the stator 3, and a slip ring 7 is connected to the side thereof. A cooling fan 8 according to the present invention is attached to the rotor 6. After the shaft 5 is passed through the hole, the cooling fan 8 is fixed to the axial end surface of the rotor 6 by, for example, welding. The shaft is supported by bearings 9 and 9' on both sides and is supported by end frames 1 and 2.
is fixed. Further, a pulley 10 is attached to the shaft on the outside of the end frame 1.

Next, the operation of the cooling fan according to the present invention will be explained. In FIG. 5, when the pulley 10 is driven from the outside, the shaft 5 rotates. The rotation of the shaft 5 causes the rotor 6 to rotate, and the cooling fan 8 coupled to the rotor 6 to rotate. As the cooling fan rotates, the first blade 84 generates an axial wind as shown by arrow A in FIG. 4, and the second blade 85 generates a centrifugal wind as shown by arrow A in FIG. . The flow of air by these blades is shown in FIG. 5, in which cooling air is introduced from the window 2' of the end frame 2 as shown by the arrow C, and after cooling the rectifying device 11, it is transferred by the first blade 84 and the second blade 85. The wind in the axial direction mainly cools the rotor coil, and the wind in the centrifugal direction mainly cools the stator coil, and is discharged from the window 1' of the end frame 1 as shown by arrow D.

In the above-described embodiments, a metal plate was used as the material for the cooling fan, but it may also be made of a non-metallic casting. Furthermore, although the present invention has been described as a centrifugal fan and an axial fan, which have the function of sending air in both directions, it is also possible to design a design that particularly increases the amount of air in either direction by changing the angle of the blades. It is possible. Further, the mounting position of the cooling fan of the present invention on the rotating electric machine can be selected as appropriate, such as mounting on one side or both ends of the pole core axial direction end surfaces of the rotor 6.

According to the present invention, cooling air can be increased by using a structure in which an axial fan and a centrifugal fan are stacked, each having a plurality of two types of blades provided on a plate-like body having a U-shaped cross section. Wind can be generated in two directions, and cooling air can always be efficiently sent to the stator coils and rotor.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional cooling fan, in which a is a front view, b is a partially omitted perspective view, FIG. 2 is a front view of a cooling fan according to the present invention, and FIG. 3 is a line shown in FIG. ’ cross-sectional view, Figure 4 is the 2nd
FIG. 5 is a cross-sectional view taken along line -' in the figure, and is a cross-sectional view of a rotating electric machine using a cooling fan according to the present invention. 1, 2... End frame, 1', 2'... Ventilation window, 3... Stator, 4... Thru bolt, 5... Shaft, 6... Rotor, 7... Slip ring,
8...Cooling fan, 9,9'...Bearing, 1
0... Pulley, 11... Rectifier, 81... Metal plate, 82... End face portion of metal plate, 83... Outer diameter portion of metal plate, 84... First blade, 85... Second blade. Feather.

Claims (1)

[Claims] 1 A substantially U-shaped cross-section with a disc-shaped end face and a cylindrical outer diameter extending to its outer periphery.
It has a plurality of equally spaced and radially formed first blades in which a part of the end face is cut into a U-shape and bent toward the inner surface, and the outer diameter A plurality of second blades are formed with a U-shaped or L-shaped cut in a part of the outer diameter part and are bent toward the inner diameter side of the outer diameter part so as to be located between the first blades. A cooling fan for a rotating electric machine, characterized in that an end face portion of the plate-like body is attached concentrically to an axial end face of a rotor of the rotating electric machine.