JPS596128Y2 - Protection device for rotating electrical machines - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a protection device for a rotating electric machine.

An example of the secondary rice will be explained with reference to FIGS. 1 and 2.

Fig. 1 is a cross-sectional view showing the lower half of the anti-load side bearing bracket of an external fan-shaped rotating electric machine, with the lower half cut away, and Fig. 2 is a cover of the discharge port seen from the direction of the arrow - I in Fig. 1. FIG.

Reference numeral 1 denotes a grease discharge reservoir of the bearing bracket, which is configured by a cover 3 fixed to the grease discharge port 2 with a fixing bolt 4, and a fan power bar 7 covering an external fan 6 fixed to one end of the rotating shaft 5. There is.

Also, is the lower part of the fan power bar 7 the front? It is usual to provide a cutout opening 8 facing the grease outlet 2.

In the above arrangement, grease accumulates in the reservoir 1 and can be removed periodically by removing the cover 3 of the grease outlet 2 through the notch opening 8 of the fan power bar 7 and removing the accumulated grease.

There is a gap L1 between the peripheral edge 9 of the notch opening 8 and the outer peripheral edge of the cover 3, and a gap L2 between the back surface of the cover 3 and the notch opening 8.

During grease removal, fingertips or solid foreign matter may enter through the gaps L and L2 and come into contact with the outer fan 6.

Further, as shown in FIGS. 3 and 4, in order to compensate for the drawbacks mentioned in the above example, a structure is provided in which a shielding wall 10 is protruded from the fan power bar 7 between the grease outlet 2 and the external fan 6. I was using it.

However, in this structure, the cooling air generated by the rotation of the external fan 6 is blocked by the protective shielding wall 10, which poses a major problem in cooling the rotating electric machine.

The present invention was developed in view of the above-mentioned circumstances, and is designed to prevent fingertips or solid foreign matter from getting into the rotating part of the external fan during the grease removal process, and to reduce the amount of cooling air generated by the external fan. It is an object of the present invention to provide a protection device for a rotating electrical machine that effectively guides the outer circumference of the rotating electrical machine.

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

FIGS. 5 and 6 are one embodiment of the present invention, and FIGS.
For the same parts as in the figures, the same reference numerals are used and detailed explanations are omitted.

FIG. 5 shows a sectional view of a protection device for a rotating electrical machine showing an embodiment of the present invention, in which a notch opening 8 provided in a fan power bar 7 between an outer fan 6 and a grease discharge port 2 is shown. Width a at the edge
A shielding wall 11 is disposed inside the fan power bar 7, and the shielding wall 11 has a U-shaped strip plate having an opening 12 in the axial direction.

The distance between the shielding wall 11 and the grease discharge port 2 is set close to a position sufficient for protecting the structure.

Further, the width a of the shielding wall 11 can be arbitrarily set to an appropriate width a depending on the position and distance between the notch opening 8 of the fan power bar 7 and the outer fan 6.

With the above structure, the gap between the notch opening 8 of the fan power bar 7 and the outer fan 6 is no longer directly connected, and the distance can be made relatively long.

This makes it possible to prevent fingertips and solid foreign matter from entering the outer fan 6 through the notch opening 8.

Moreover, since the shielding wall 11 defines the opening 12 in the axial direction,
The cooling air generated by the external fan 6 can flow to the outer periphery of the rotating electric machine without any obstructions, so that the cooling effect is not impaired.

It goes without saying that the shielding wall 11 of the present invention is not limited to a U-shape, but can also have an arcuate shape as shown in FIG.

By adopting the present invention, it is possible to prevent fingertips or solid foreign objects from touching the outer fan during maintenance and inspection of a rotating electric machine.

Furthermore, it is possible to obtain a protective structure that improves the cooling function of the rotating electric machine.

[Brief explanation of the drawing]

1 to 4 are conventional protection devices, FIGS. 1 and 3 are sectional views, and FIG. 2 is a front view as viewed from the II-III arrow in FIG.
Fig. 4 is a front view taken from the I■-■■ arrow in Fig. 3, Fig. 5 is a sectional view of the protective device of the present invention, and Fig. 6 is a front view taken from the ■I-■I arrow shown in Fig. 5. FIG. 7 is a front view showing another embodiment. 2... Grease discharge port, 3... Cover, 5... Rotating shaft, 6... Outer fan, 7...
...Fan power bar, 8...Notch opening,
10.11... Shielding wall, 12... Opening.

Claims (1)

[Scope of utility model registration request] an outer fan disposed on the outside of a bearing fitted into one end of a rotating shaft; a cover for closing a grease discharge port of a bearing bracket surrounding the bearing; and a fan power bar surrounding the outer fan and the bearing bracket. In the protection device for a rotating electric machine, which is provided with a notch opening for attaching and detaching the cover, a strip plate is provided at the edge of the notch opening provided in the fan power bar between the outer fan and the grease discharge port. A protection device for a rotating electric machine, characterized in that a gate-shaped shielding wall having an opening in the axial direction is disposed inside the fan power bar.