JPH0229801Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field of invention] The present invention relates to draining water from a vertical rotating electric machine.

[Technical background of the invention and its problems] Conventionally, a drain hole was provided in the lower bearing bracket of a vertical rotating electric machine to drain water that accumulates inside the machine due to breathing action to the outside, as shown in Figures 1 and 2. It looked like Figure 2.

In FIGS. 1 and 2, 1 is a rotating shaft, 2 is a bearing fitted to the rotating shaft 1, 3 is a bearing bracket that supports the bearing 2, 4 is a drain hole drilled in the bearing bracket 3, and 5 is a bearing bracket that supports the bearing 2. numeral 6 is a plug screwed into the drain hole 4 from the outside of the rotating electric machine, and 6 is the main body of the rotating electric machine. Generally, the lower bearing bracket 3 is provided with radial reinforcing ribs 3a inside to provide strength. Therefore, the internal space of the lower bearing bracket 3 is divided by the reinforcing ribs 3a, and the number of divided spaces is 8 in FIGS. 1 and 2.
It is individual. Water accumulates in the spaces 3b in the lower bearing bracket 3 divided by the reinforcing ribs 3a, and in order to guide this accumulated water to the drain hole 4,
A through hole 7 was provided at the bottom of each reinforcing rib 3a.

However, in this configuration, since the lower bearing bracket 3 is generally made of cast iron, a core is required to provide the through hole 7 at the lowest part of the reinforcing rib 3a, which not only complicates the mold, but also It takes a lot of casting time and is expensive.
Another disadvantage is that molding sand is baked into the through hole 7 after casting, and it takes a lot of time to remove it.

[Purpose of the invention] The present invention was made in order to eliminate the above-mentioned drawbacks, and provides a bearing bracket for a vertical rotating electric machine that does not require a core during casting and has a structure that allows accumulated water inside the machine to be easily guided to the drain hole. The purpose is to provide.

[Summary of the invention] The structure has reinforcing ribs arranged radially on the outer periphery of the bearing housing boss of the lower bearing bracket and on the inner periphery of the inner wall, respectively, and there is a gap at the tip of the reinforcing rib, and this gap is alternately arranged. A rotating electric machine that allows water to pass through the bearing bracket in a staggered manner while cooling it and reach the drain hole.This rotating electric machine also has the function of improving the cooling effect of the bearing bracket by easily guiding accumulated water to the drain hole without using a core during casting. bearing bracket.

[Embodiment of the invention] The invention will be described with reference to the drawings of one embodiment. Fig. 3 is a longitudinal sectional front view of a bearing bracket for a vertical rotating electric machine according to the present invention, and Fig. 4 is a -
FIG. 3 is a cross-sectional view taken along the line. Note that parts that are the same as those in the prior art will be explained using the same reference numerals. In the figure,
Bearing housing boss 3 of lower bearing bracket 3
From c, a triangular reinforcing rib 8a is integrated with one side of the triangle excluding the oblique side to the bearing housing boss 3c and the bottom of the bearing bracket 3, so that a gap 9a is formed between the tip of the reinforcing rib and the inner wall 3d. A plurality of them (the figure shows four) are provided radially. Further, a reinforcing rib 8 is inserted from the inner wall 3d of the lower bearing bracket 3.
b, each side of the triangle excluding the hypotenuse is the inner wall 3d
A plurality of reinforcing ribs (four shown in the figure) are provided radially so as to form a gap 9b between the tip of the reinforcing rib 8b and the bearing housing boss 3c. The ribs 8a and 8b are arranged alternately.

The function of the reinforcing ribs 8a and 8b configured in this way will be explained. Since the cooling air generated by the fan effect due to the rotation of the rotating shaft 1 circulates in the circumferential direction on the reinforcing ribs 8a and 8b, the pressure of this circulating cooling air causes water to accumulate in the space 3b divided by the reinforcing ribs 8a and 8b. The water passes through the gaps 9a and 9b in a staggered manner to the drain hole 4, and is discharged from the inside of the machine by pulling out the plug 5. In this way, the reinforcing rib 8
The upper parts of a and 8b are oblique sides of a triangle, which become sloped and lower toward the tips, and have gaps 9a and 9b at the tips, so that the cooling air reaches above the bottom of the bearing bracket 4 and eliminates the pooling in the space 3b. It acts to circulate water in a staggered manner in the circumferential direction, and this circulation also removes heat from the bearing bracket 4 and cools it.

On the other hand, conventionally, the reinforcing rib 3a is continuous between the bearing housing boss 3c and the inner wall 3d.
The reinforcing rib 3a acts as a wall and prevents the cooling air from reaching above the bottom of the bearing bracket 4. For this reason, the standing water in the space 3b does not circulate over the bottom of the bearing bracket, but flows only due to the difference in height, so that recovery of the standing water is poor and the bearing bracket 4 cannot be expected to be cooled by cooling air.

That is, the triangular reinforcing ribs 8a and 8b having gaps 9a and 9b in this embodiment facilitate the discharge of accumulated water and improve the cooling effect of the bearing bracket 4.

Further, the reinforcing ribs 8a and 8b do not require the through holes 7 as in the conventional case, and when casting the bearing bracket, no core is required, the mold is simple, the casting time is short, and the workability is easy.

Although the above description has been made with the reinforcing ribs 8a and 8b having triangular shapes, even if the gaps 9a9b are formed vertically as rectangles, the same effects such as guiding the accumulated water to the drainage holes and eliminating the need for a core can be obtained. .

[Effects of the invention] As described above, according to the invention, the water that accumulates in the gap provided at the tip of the reinforcing rib passes through the gap provided at the tip of the reinforcing rib in a staggered manner and is guided to the drain hole, so that less water accumulates in the space. Water can be easily removed and the cooling efficiency of the bearing bracket is also improved. Additionally, since there are no through holes in the reinforcing bridge, no core is required when casting the bearing bracket, which simplifies the molding process.
Rotating electric machines are easy to manufacture and finish.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of the main part of the lower bearing bracket of a conventional vertical rotating electric machine, and Figure 2 is the same as that shown in Figure 1.
3 is a vertical sectional front view of the main part of the lower bearing bracket of the vertical rotating electric machine of the present invention,
FIG. 4 is a sectional view taken along the line - in FIG. 3. 1...Rotating shaft, 3...Bearing bracket, 3b...
...Space, 3c...Bearing housing boss, 3d...
Inner wall, 4...Drain hole, 8a, 8b...Reinforcement rib, 9a, 9b...Gap.

Claims (1)

[Scope of utility model registration request] In a bearing bracket having a bearing housing boss into which a bearing of a vertical rotating electric machine is fitted and an inner wall formed substantially concentrically and integrally on the outside of the bearing housing boss, a reinforcing rib provided on the inner periphery of the inner wall and the bearing bracket are provided. Reinforcement ribs provided on the outer periphery of the bearing housing boss and the inner wall are arranged in opposing directions, and the tips of the reinforcing ribs are arranged with gaps with the bearing housing boss and the inner wall, respectively, and these gaps are arranged alternately, and water drain holes penetrating the inner wall are arranged. 1. A bearing bracket for a vertical rotating electric machine, comprising: