JPS6020740A - Structure of bearing of rotary electric machine of vertical shaft type - Google Patents

Abstract

PURPOSE:To completely prepare a waterproof upper bearing by upward projecting an upper bearing retainer, and providing a rotary drain disc on a rotational shaft near the retainer. CONSTITUTION:A retainer 3A of the upper bearing 2 of an end bracket 3 is projected upward from the remainder of the end bracket. A rotary drain disc 4 is mounted near the retainer 3A on a rotational shaft 1 extending upward from the retainer 3A. Since the retainer 3A is projected upward from the surface of the remaining end bracket 3, water does not enter into the bearing 2 from between the retainer 3A and the disc 4. Water droplets dropped on the disc 4 are centrifugally scattered by the disc 4 through a space 10 and exhausted in a direction C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a structure of an upper bearing part of a shaft-mounted rotating machine, and particularly to a structure of an upper bearing part of a shaft-mounted rotating machine suitable for outdoor installation. It is related to.

[Prior art]

FIG. 1 shows an example of the waterproof structure of the upper bearing part of a conventional shaft-mounted outdoor rotating machine. In FIG. 1, 1 is a rotating shaft, 2 is an upper bearing, and 3 is an end bracket. On the rotating shaft 1,
The rotating draining disc 4 is attached close to the end bracket 3. A labyrinth 5 is formed between the rotating draining disc 4 and the end bracket 3. The water droplets shaken off by the rotary draining disc 4 are discharged through a plurality of holes 6 provided at the peripheral edge of the end bracket 3. However, in the structure of such a bearing part,
There are the following problems.

(1) When the amount of water droplets increases, there is a possibility that the water cannot be completely extracted by the drain hole 6 and accumulates on the upper surface of the end bracket 3, and the water may enter the bearing 2 through the labyrinth 5. In order to avoid this, if a large number of drainage holes 6 are provided with a narrow diameter, the strength of the end bracket 6 will be reduced.

(2) The structure is complicated, and the processing of the end bracket 3 and the rotary drain plate 4 requires a large number of man-hours.

(3) The upper bearing is not cooled properly.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure of a bearing section of an upward rotating machine that can completely waterproof the upper bearing section and effectively cool the upper bearing section. .

[Summary of the invention]

The structure of the bearing part of the shaft-up rotating machine according to the present invention is such that the upper bearing holding part is protruded upward from the end bracket, and a rotary drainage disc is provided on the rotating shaft close to the bearing holding part, and the bearing holding part is provided with a rotary drainage disc on the rotating shaft. A space is formed by holding an annular plate with an inner diameter larger than the inner diameter and a diameter V larger than the casing with a required gap between the end bracket and the water blown away by the rotating water draining disc through the space. Cooling air is discharged from the rotating machine and rises along the casing from an external fan attached to the lower side of the rotating machine, and is blown onto the bearing holding part through the space. It is a structure.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings. Second
The figure is a longitudinal cross-sectional view of an embodiment of the axially rotating machine of the present invention.

In this shaft-upward rotating machine, the rotating shaft 1 extends upward from the end bracket (upper part) 3, and a load (not shown) (
In the case of a generator, it is connected to the prime mover). The holding part 6A of the upper bearing 2 of the end bracket B protrudes upward from the remaining part of the end bracket.
The rotary draining disc 4 is installed close to A. A conventional labyrinth structure is not provided between the rotating draining disk 4 and the bearing holding portion 3A. Therefore, processing of both is easy. It is desirable that the diameter of the rotating draining disc 4 is larger than the diameter of the bearing holding part 6A, but even if it is smaller than the diameter of the bearing holding part 5A, the bearing holding part 3A will not protrude above the surface of the remaining end bracket 3. Therefore, water does not enter into the bearing 2 from between the bearing holding portion 3A and the rotary draining disc 4. A stepped portion 4 whose central portion is recessed inside the rotating draining disk 4
A, and if the bearing holding portion 3A is provided with a corresponding convex portion 6B and the convex portion 3B is loosely fitted into the recess of the rotary draining disc 4, water intrusion into the bearing 2 can be further reduced. This can be completely prevented and requires only a small amount of processing effort.

On the upper side of the end bracket 3, the inner diameter is 3A.
An annular plate (flange) 8 whose outer diameter is longer than the diameter of the casing 7 is held on the end bracket B by a support plate 8A while maintaining a required distance from the end bracket 3. A space 1 is formed between the annular plate 8 and the annular plate 8.
0 is formed. It is appropriate that the distance between the annular plate 8 and the end bracket 6 be approximately equal to the protruding length of the bearing holding portion 3A.

The water droplets that have fallen onto the rotary draining disk 4 are blown away by the rotating draining disk 4 and are discharged in the direction C through the space 1o. Water droplets that have fallen between the rotating draining disk 4 and the annular plate 8 are also discharged in the C direction along the same path, passing between the rotating draining disk 4 and the bearing holding part 3A, and the water droplets are prevented from entering the bearing 2 part. do not have.

In this rotating machine, as in conventional rotating machines, an external fan 9 is attached to the rotating shaft 1 that projects downward, and the cooling air generated by the external fan 9 or a part thereof is It is raised along the caisson 7 to cool the rotating machine from the outside. 7A is a cooling fin. In this rotating machine, the cooling air rising along the casing 7 collides with the lower surface of the annular plate 8 to branch in the directions of arrows A and B, and the cooling air flowing in the direction B further collides with the bearing holding portion 3A. In this way, the bearing holding portion 3A is cooled.

FIGS. 3 to 7 show an embodiment of the present invention in which only the upward rotation on the axis is smaller. In this embodiment as well, the bearing holding portion 3A remains at the end. FIG. 4 shows an embodiment in which a cylindrical cold air guide plate 8B surrounding the support plate 8A is attached to the lower side of the annular plate 8. By doing so, the cold air does not flow in the inlet direction, but instead flows in the B direction (see FIG. 2), thereby improving the cooling efficiency.

FIG. 5 shows an embodiment in which the outer peripheral edge of the annular plate 8 is made slightly lower and has a conical shape. As a result, more cooling air can be sent in the direction of arrow B than in the direction of arrow A, so that the cooling efficiency of the bearing can be increased.

FIG. 6 shows an embodiment in which the annular plate 8 is made higher and a labyrinth structure is formed between the rotary drain plate 4 and the bearing holding portion 3A.

FIG. 7 shows an embodiment in which the annular plate 8 and the support plate 8A are integrally cast with the end bracket 3.

〔Effect of the invention〕

The bearing portion of the shaft upward rotating machine of the present invention is configured as described above,
Since the upper bearing holder protrudes upward and the rotary drain disc is provided on the rotating shaft in close proximity to the upper bearing holder, there is no need for a labyrinth structure between the upper bearing holder and the rotary drain disc to prevent water from entering the bearing. Never enter. In addition, sufficient drainage from the end brackets prevents water from accumulating on the end brackets, and even if water does accumulate,
Since the bearing holding part protrudes upward, the bearing part is completely waterproof.

In addition, in the rotating machine of the present invention, the upper bearing holding part is made to protrude upward, and the cooling air rising along the casing is made to collide with this, so that the upper bearing is well cooled and the temperature of the bearing part is reduced. rise is reduced.

Furthermore, there is no need to create a labyrinth structure between the bearing holding portion and the rotary water draining disk, and the shape is simplified and the number of processing steps can be reduced.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of an example of the upper bearing part of a conventional axially rotating machine, FIG. 2 is a vertical sectional view of an embodiment of the axially rotating machine of the present invention, FIGS. 3 and 4, FIGS. 5, 6, and 7 are longitudinal sectional views of the upper bearing portion of different embodiments of the upward rotating machine of the present invention.

Claims (1)

[Claims] The upper bearing holding part of the shaft-upward rotating machine is made to protrude upward from the end bracket, and a rotary draining disk is provided on the rotating shaft in close proximity to the bearing holding part, and the inner diameter and casing are arranged closer to each other than the bearing holding part. An annular plate having a larger outer diameter is held at a required distance from the end bracket to form a space, through which the water blown off by the rotating drainage disc is discharged and , an axially rotating machine characterized in that cooling air rising along the recasing is blown from an external fan attached to the lower side of the rotating machine through the space and onto the bearing holding part. The structure of the bearing part.