JPH0246318A - Bearing cooling device for revolving electric machine - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of a bearing part with an extremely simple structure by forming a bearing bracket in which a plurality of external open ventilating holes covered with a dust protective net are provided at a bearing part of a revolving electric machine. CONSTITUTION:A rotor 4 held by an armature shaft 2 has an armature ventilation flue 4a, and is supported by a bearing 3. The cooling wind inside the revolving electric machine cools the armature 4 and so on passing through the armature ventilation flue 4a from the outside of the revolving electric machine, as indicated by an arrow B. By forming a bearing bracket 1 provided with a plurality of external open ventilating holes 1a covered with a dust protective net 1b, the cooling wind is induced into a negative pressure part of the space 5 from the external open ventilating hole 1a, as indicated by an arrow A, and the bearing bracket 1 is thus cooled. In this way, a bearing part can be cooled with a structure made as simply as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating electric machine having an internal ventilation passage, and particularly to a cooling device suitable for preventing a rise in temperature of a bearing portion.

[Conventional technology]

As described in Japanese Utility Model Application Publication No. 56-38545, the conventional device was not designed to incorporate the bearing cooling device into the rotating electric machine.

[Problem to be solved by the invention]

The above-mentioned conventional technology requires a large space for providing ventilation holes for cooling the bearing portion, and does not take into account small-sized rotating electric machines, so there is a problem in applying it to all types of rotating electric machines.

An object of the present invention is to reduce the space required for providing ventilation holes for cooling a bearing portion and to improve cooling efficiency.

[Means to solve the problem]

The above object is achieved by providing a plurality of externally open ventilation holes in the bearing bracket and introducing cooling air into the rotating electric machine.

[Effect]

Cooling air inside the rotating electric machine is taken in from the outside and discharged outside the machine. At this time, the internal cooling air discharge part, that is,
The bearing section is under negative pressure relative to the external atmospheric pressure. Therefore, by providing a bearing bracket with a ventilation hole open to the outside, outside air is drawn into the machine through the ventilation hole and cools the bearing section.

Furthermore, between the in-machine ventilation path and the bearing part, a partition plate or
The effect can be improved by providing a fan that also serves as a partition plate.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

A rotor 4 supported by an armature shaft 2 has an armature ventilation passage 4a and is supported by a bearing 3.

The bearing 3 is a rotating electrical machine held by the bearing bracket 1.

Here, the cooling air inside the rotating electrical machine passes from the outside of the rotating electrical machine through the armature ventilation path 4a as shown by arrow B, cools the armature 4, etc., and is discharged from the bearing bracket 1 to the outside of the rotating electrical machine. In this way, since the cooling air inside the rotating electric machine cools the armature 4 and the like, the temperature is highest near the bearing on the discharge side, thereby warming the bearing. Further, the space 5 between the rotating armature 4 and the stationary bearing bracket 1 has a negative pressure relative to the atmospheric pressure near the armature shaft 2.

A dustproof net 1b is attached to the bearing part of a rotating electric machine having such a configuration.
By providing the bearing bracket 1 with a plurality of external open ventilation holes 1a covered with
A is sucked into the negative pressure part of the space 5 as shown by arrow A, and the bearing bracket 1 is cooled.

According to this embodiment, there is an effect of reducing the temperature rise of the bearing portion on the cooling air discharge side that is warmed by the cooling air inside the rotating electric machine.

The partition plate 6 in FIG. 2 blocks the cooling air B inside the rotating electric machine and the cooling air A of the bearing bracket 1, and the space 5a is
The negative pressure is even greater than that in the space 5 in FIG. 1, and more cooling air is sucked in through the externally open ventilation holes 4a, improving the cooling effect.

The impeller 7 in FIG. 3 also serves as the partition plate 6 in FIG. 2, and is configured to forcibly suck in the cooling air A of the bearing bracket 1 through the external open ventilation hole 4a. , which has an improved cooling effect.

Note that the bearing bracket 1 provided with an externally open ventilation hole can be applied not only to a device in which cooling air inside a rotating electric machine is ventilated from the outside, but also to a device in which a rotating electric machine is self-cooled.

〔Effect of the invention〕

According to the present invention, the bearing can be cooled with an extremely simple structure.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a bearing cooling device for a rotating electrical machine according to one embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views of other embodiments of the present invention. 1... Bearing bracket, 2... Armature shaft, 3...
Bearing, 4... Armature, 5... Space, 6... Shielding plate,
7... Impeller, 1a... External open ventilation hole, 4a...
・Armature ventilation path. lbFigure 1Figure 2Figure 3

Claims (1)

[Scope of Claims] 1. A bearing cooling device for a rotating electric machine, characterized in that, in a bearing portion that supports an armature shaft, an externally open ventilation hole is provided in a bearing bracket that supports the bearing. 2. The bearing for a rotating electric machine according to claim 1, wherein a partition plate is provided between the bearing bracket provided with the external open ventilation hole and the internal cooling air passage of the rotating electric machine. Cooling system. 3. Claim 1, characterized in that a fan that also serves as a partition plate is provided between the bearing bracket provided with the external open ventilation hole and the internal cooling air passage of the rotating electric machine.
A bearing cooling device for a rotating electrical machine as described in .