JPS59220041A - Bearing cooling apparatus for rotary electric machine - Google Patents

Abstract

PURPOSE:To effectively cool a bearing by disposing intake ports and exhaust ports such that the outside air flows in one direction. CONSTITUTION:Intake ports 4 are formed in only part of a fan 7 on its inner peripheral side, and on the other hand, exhaust ports 5 are formed in only part of the fan 7 on its outer peripheral side. In this case, the exhaust ports 5 are provided on the side substantially opposite to the intake ports 4 in relation to the axis. With this arrangement, the outside air sucked from the intake ports 4 flows along with not only the outer peripheral surface but also the side surface of a bearing 2 of a bracket 3A and then is discharged from the exhaust ports 5, whereby the cooling area is enlarged. Hence, the cooling of the bearing 2 is effectively performed.

Description

[Detailed description of the invention] rTechnical field to which the invention belongs] The present invention relates to a bearing cooling device for a rotating electric machine.

[Prior art and its problems]

In rotating electric machines that require a special device to cool the bearings because the bearing temperature is relatively low during operation, the area around the bearings is cooled by drawing outside air through an intake port on the bracket by rotating an internal fan. A bearing cooling device is used that exhausts air from an exhaust port. To illustrate this structure, Fig. 1 is a longitudinal sectional view of a bearing cooling device of this structure;
FIG. 2 is a cross-sectional view taken along the line II in FIG. 1.

In the figure, reference numeral 1 denotes a rotating shaft, which is supported by a bearing 2.

The bracket 3 that holds the bearing 2 has a plurality of radial intake ports 4 near the bearing 2, and a plurality of air intake ports 14i located far from the bearing 2.
A plurality of exhaust ports 5 are provided radially. The position of the fan 7 on the disc 6 is located between the intake port 4 and the exhaust port 5 on the side of the placket 3. In addition, a baffle plate 8 is provided that covers the entire circumference while maintaining a gap with the outer circumference of the disc 6, so that the outside air from the intake port 4 is not dispersed toward the outer circumference of the fan 7 due to the rotation of the fan 7, and the air is removed from the exhaust port 5. It serves as a guide.

In the bearing cooling device ζ as described above, heat generated in the bearing 2 during operation of the converter is conducted around the bearing of the bracket 3. Here, it is desirable that the L air taken in by the rotation of the fan 7 sufficiently cools the area around the bearing and then is exhausted from the exhaust port 5 in the direction of the solid arrow, but in reality, the outside air cools the area around the bearing sufficiently. There is a drawback that if the air is not used properly, it will short-circuit from the intake port 4 and escape to the exhaust port 5.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bearing cooling device for a rotating electrical machine having a structure that eliminates the above-mentioned drawbacks and sufficiently cools the area around the bearing.

[Key points of the invention]

Therefore, according to the present invention, the above object is such that the intake port is opened only in a part of the inner circumference side of the fan, and the exhaust port is opened only in a part of the outer circumference side of the fan, and the axial center This can be achieved by providing the air inlet on substantially opposite sides of the inlet, thereby making the flow of outside air from the inlet in one direction, cooling the area around the bearing, and exhausting the air through the exhaust port.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

3 is a longitudinal cross-sectional view of a bearing cooling device according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view taken in the direction of the [-if arrow in FIG. 3. In the drawings, parts corresponding to those of the conventional structure (FIGS. 1 and 2) are designated by the same reference numerals.

In this structure, the intake port 4 opens only in a part of the inner circumferential side of the fan 7, and the exhaust port 5 opens only in a part of the outer circumferential side of the fan 7, and is almost opposite to the inlet port 4 with respect to the axis. With this arrangement, the outside air taken in from the intake port 4 flows as shown by the arrow and is exhausted from the exhaust port 5, so the area around the bearing of the bracket 3 is not only the outer circumferential surface but also the side surface of the bracket 3. Outside air flows f-1. The bearing is cooled redundantly.

5 is a longitudinal cross-sectional view of a bearing cooling device according to another embodiment of the present invention, and FIG. 6 is a cross-sectional view taken in the direction of the arrow σ11-III in FIG. In this structure, the intake port 4 and the exhaust port 5
0) Although the position is similar to that shown in FIGS. 3 and 4, a cross-sectional shape F, An air guide 9 that guides the flow of outside air is arranged in an arcuate shape. By providing this arc-shaped air guide, the outside air taken in from the intake port 4 is guided by the air guide 9, flows in the direction of the arrow I9, and is exhausted from the exhaust port 5, so that the side surface of the bracket 3 around the bearing Cooling of the bearings is facilitated by a large amount of outside air flowing along the bearings.

Note that the intake ports and exhaust ports shown in FIGS. 3 to 6 are shown as having a plurality of circular shapes, but this shape is
It is also possible to use a small half-moon shaped intake port 4A and exhaust port 5A as shown in the figure. The positions of the intake and exhaust ports shown in Figures 3 to 6 are as follows: the intake port is above the diameter of one of the brackets (10), and the exhaust port is below the diameter of that bracket (iJ
! Although the illustration shows the intake port placed at the bottom side and the exhaust port at the top side, the intake port and the exhaust port may be arranged in the first opposite direction, each including the diameter of one of the brackets. It may be arranged laterally or diagonally. [Effects of the Invention] According to the structure of the present invention described above, the intake and exhaust ports are arranged so that the outside air flows in one direction. Because
A short-circuit phenomenon in which outside air flows directly from the intake port to the exhaust port does not occur, and the outside air flows not only along the outer peripheral surface of the bladder-soto bearing but also along the sides, increasing the cooling area, so the bearing can be cooled. This can be done more effectively and the fan can be made smaller.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a conventional bearing cooling device, Fig. 2 is a cross-sectional view taken along arrow I-1 at 16 in Fig. 1, and Fig. 3 is a partial cooling device according to an embodiment of the present invention. FIG. 4 is a longitudinal sectional view of the manufacturing process, FIG. 4 is a cross sectional view taken along the arrows ``--'' in FIG. 3, FIG. 5 is a lateral sectional view of a bearing cooling device according to another embodiment of the present invention, and FIG. FIG. 5 is a horizontal 1jvr view in the direction of arrow 2-IT in FIG. 5, and FIG. 7 is a cross-sectional view of a bearing cooling device having intake ports and exhaust ports of different shapes according to another embodiment of the present invention. 1: Rotating shaft, 2: Bearing, 3, 3A nib bracket, 4.4
A: Intake port, 5, 5A two exhaust ports, 72 fans, 8: Jail plate, 9: Air guide. Fang 1 Figure 2 4-1 Fang 5 Off view Fang 6

Claims (1)

[Claims] l) A bracket that supports a bearing of a rotating electric machine, a fan provided inside this bracket, a baffle plate surrounding the outer periphery of this fan, and an intake port and an exhaust port provided in the bracket. In the bearing cooling device, the intake port opens only on a part of the inner circumference side of the fan, and the exhaust port opens only on a part of the outer circumference side of the fan, and the air intake port opens only on a part of the outer circumference side of the fan. A bearing cooling device for a rotating electrical machine characterized by being provided on substantially opposite sides. 2. A bearing cooling device for a rotating electrical machine as set forth in claim 1, characterized in that an arcuate air guide is provided along the outer periphery of the intake port of the bracket and between the inner periphery of the opposing fan. .