JPH0534211Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Purpose of invention] (Industrial application field) The present invention relates to a bearing cooling device for a rotating electric machine.

(Prior Art) In rotating electrical machines that operate at high speeds and continuously rotate, and require a dedicated device for cooling the bearings because the bearing temperatures are relatively high, a bearing cooling device is used in which the rotation of an internal fan draws in outside air through an intake hole in the bracket, cools the area around the bearings, and then exhausts the air through an exhaust hole. This is described as a conventional example in Japanese Patent Publication No. 61-5351. This structure is illustrated in Fig. 3, which is a vertical cross-sectional view of a bearing cooling device with this structure, and Fig. 4, which is a cross-sectional view taken along the line indicated by the arrow in Fig. 3. In the figure, a rotating shaft 1 is supported by a bearing 2, and a bracket 3 with a bearing housing 3a that holds the bearing 2 has a plurality of intake holes 4 radially arranged on the center side and a plurality of exhaust holes 5 radially arranged on the outer periphery side. The radial position of the disk 7 of the fan 6 is provided at a position equivalent to the distance between the intake hole 4 and the exhaust hole 5. A shield plate 8 is provided to cover the entire circumference of the disk 7 while maintaining a gap therebetween, and the air is prevented from being dissipated in the direction of the outer periphery of the fan 6 by the rotation of the fan 6 from the intake hole 4 by the exhaust hole 5.
It acts as a guide to allow water to be discharged from the

In the bearing cooling device as described above, heat generated in the bearing 2 during operation of the rotating electric machine is conducted around the bearing box 3a of the bracket 3. Here, it is desirable that the outside air sucked in by the rotation of the fan 6 cools the area around the bearing and then is discharged from the exhaust hole 5 in the direction of the solid line arrow. There was a drawback that a short circuit occurred from hole 4 and leaked to exhaust hole 5. Therefore,
In the invention disclosed in Japanese Patent Publication No. 61-5351, as shown in FIGS. 5 and 6, the intake hole 4 is opened only in a part of the inside of the fan 6, and the exhaust hole 5 is opened approximately at the center of the intake hole 4 with respect to the axis. A proposal has been made to open only a part of the outer circumferential side of the fan 6 on the opposing side, to cool the area around the bearing by making the flow of outside air from the intake hole 4 in one direction, and to short-circuit the outside air so that it does not flow to the exhaust hole 5. This seemed to be quite effective, but even if the short-circuit flow is eliminated, there is a possibility that the flow will flow away from the bearing area, so the original bearing cooling will not be improved, and the area of the intake hole 4 will be reduced by almost half. Therefore, in a state where a large amount of loss occurs, the amount of outside air is limited, and the cross-sectional shape L is formed on the outer circumferential side of the intake hole 4.
Even if the letter-shaped air guide 11 was provided in an arc shape, it was not possible to effectively cool the bearing.

(Problems to be Solved by the Invention) The object of this invention is to provide a bearing cooling device for a rotating electrical machine having a structure in which the area around the bearing is sufficiently cooled by eliminating the above-mentioned problem of insufficient cooling of the bearing. With the goal.

[Structure of the idea]

(Means for solving the problem) In this device, a circular plate fixed to the rotating shaft is provided inside a bearing box bracket that supports the bearings of a rotating electric machine, a fan is provided on the bracket side of the circular plate, and a cylindrical shield plate is provided which is fixed to the bracket, extends in the axial direction and maintains a gap with the outer periphery of the circular plate, the shield plate, the circular plate and the bracket form an outer casing for the fan, and the bracket is provided with an intake hole and an exhaust hole, in which a cylindrical inner casing is provided between the intake hole and the inner side of the fan, extending in the axial direction from the bracket and facing the circular plate and the inner side of the fan with a gap, and a number of axial cooling fins are provided between the inner circumference of the inner casing and the outer periphery and side of the bearing box.

(Function) With this configuration, the heat from the bearing box is released to the outside air by the cooling fins, and the inner casing effectively guides the outside air to the fan, thereby improving the cooling of the bearing.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a bearing cooling device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken in the direction of the - arrow in FIG. A disc 7 fixed to the rotating shaft 1 is provided inside a bracket 3 that supports a bearing 2 of a rotating electrical machine, and a fan 6 is provided on the bracket side of this disc 7, and is fixed to the bracket and extends in the axial direction. A cylindrical shield plate 8 is provided to maintain a gap with the outer periphery of the disc 7. This thin plate 8 and disk 7
The outer casing of the fan 6 is formed by the bracket 3 and the bracket 3 is provided with an intake hole 4 and an exhaust hole 5 to form a bearing cooling device, as shown in FIGS. 3 and 4.
It is the same as the conventional structure shown in the figure. However, in this embodiment, a cylindrical inner casing 9 extending in the axial direction between the intake hole 4 and the fan 6 is attached to the bracket 3, and the inner periphery of the inner casing 9 and the bearing box 3 are connected to each other.
A plurality of axial cooling fins 10 are provided between the outer periphery and the side surface of a.

With this configuration, the outside air taken in through the intake hole 4 flows as shown by the arrow and is exhausted from the exhaust hole 5, so that the cooling gas is separated from the outer peripheral surface of the bearing box 3a around the bearing 2 of the bracket 3. The heat generated in the bearing 2 passes through the bearing box 3a to the fin 1.
Since the cooling gas flows between the fins 10, the amount of heat exchanged on the surface of the fins 10 increases significantly, and the bearing 2 is sufficiently cooled.

[Effect of idea]

As explained above, according to the present invention, heat exchange with the outside air occurs not only on the outer circumferential surface of the bracket and bearing box, but also on the surfaces of multiple fins, which significantly increases the cooling area, making bearing cooling more effective. This can be done to make the fan smaller.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the bearing cooling device of the present invention, Fig. 2 is a transverse sectional view taken in the - arrow direction in Fig. 1, and Fig. 3 is a longitudinal sectional view of a bearing cooling device of conventional structure. , FIG. 4 is a cross-sectional view taken in the - arrow direction of FIG. 3, FIG. 5 is a longitudinal cross-sectional view of a bearing cooling device with a different conventional structure, and FIG. 6 is a cross-sectional view taken in the - arrow direction of FIG. . 1...Rotating shaft, 2...Bearing, 3...Bracket, 3a...Bearing box, 4...Intake hole, 5...Exhaust hole, 6...Fan, 7...Disc, 8...Shiya Height plate, 9...inner casing, 10...fin.

Claims (1)

[Scope of utility model registration request] A disc fixed to the rotating shaft is provided inside a bracket with a bearing box that supports a bearing of a rotating electric machine, a fan is provided on the bracket side of this disc, and a fan is fixed to the bracket and extends in the axial direction to extend in the axial direction. A cylindrical shielding plate is provided to maintain a gap with the outer periphery of the plate, and this shielding plate, the disk, and a bracket form the outer casing of the fan, and the bracket is provided with intake holes and exhaust holes. In the device, a cylindrical inner casing is provided between the intake hole and the inner circumferential side of the fan, and extends in the axial direction from the bracket and faces the disk and the inner circumferential side of the fan with a gap therebetween, and A bearing cooling device for a rotating electric machine, characterized in that a plurality of axial cooling fins are provided between an inner circumference and an outer circumference and side surface of a bearing box.