JPS6040897A - Thrust bearing - Google Patents

Abstract

PURPOSE:To facilitate the welding of an oil feed pipe for supplying cooled lubricating oil to the sliding surface of a bearing shoe, prevent the bearing shoe from being burned due to the pulling-out of sludge, and protect externally installed pump rotary vanes from damage, by placing the downstream end of the oil feed pipe inside a bracket. CONSTITUTION:The downstream end of an oil feed pipe 8 is placed inside a bracket 6. The oil feed pipe 8 comprises a pipe 8f, through which cooled lubricating oil 9' is supplied, a ring header 8i provided at the downstream end of the pipe 8f, and a branch pipe 8j for connecting the ring header to sliding surfaces. For that reason, the welding space for the members for constituting the oil feed pipe 8 is enlarged so that the members can be continuously welded to each other. A bearing shoe 3 is thus prevented from being burned due to the pulling-out of sludge which would be produced in discontinuous welding.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a thrust bearing device for a vertical shaft rotating machine such as a water turbine generator, and more particularly to a thrust bearing device that supplies cooled lubricating oil to the sliding surface of a bearing shoe. 6 [Background of the Invention] Fig. 1 shows a conventional example of a main part of a thrust bearing device V of a vertical shaft water turbine generator. A runner 2 is fixed to the rotating shaft 1, and the runner 2 is connected to a plurality of bearing shoes 3 and the WI 111b.

This bearing shoe 3 is swingably supported by a pivot 4, and the load is supported and transmitted from the bracket 6 to the foundation 12 via the frame 5 and key lo.

The bracket 6 is formed into an annular body with a triangular cross section,
Lubricating oil 9' is stored in an oil tank 9 inside the annular body. The lubricating oil 9' in which the bearing shoe 3 is immersed is transferred from the vibrator 7 to the oil cooler P by an external pump or the like.
C (not shown) and cooled. The lubricating oil 9' cooled by the oil cooler P is supplied to the sliding surface between the runner 2 and the bearing shoe 3 (hereinafter referred to as the sliding surface of the bearing shoe 3) through the oil supply pipe 8. That is, the oil is supplied to the sliding surface of the bearing shoe 3 from the pipe 8a through the ring header 8g and the branch pipe 8j provided on the sliding surface of the bearing shoe 3. After the sliding surfaces have been cooled and lubricated, they are returned to the oil cooler P.

After cooling, it is ready for use. This lubricating oil 9' circulation circuit is often used in large-capacity, high-speed water turbine generators, etc.
This has had a significant effect on improving bearing performance. However, since this bearing device is used as a large-capacity, high-speed machine, the radial dimension, that is, the length of the base of the triangular bracket, is shortened, and the height is also reduced to increase the rigidity in the radial direction. Therefore, pipe 8f installed inside the bracket
The installation welding work of the ring header 8g and the branch pipe 8h is extremely difficult. On the other hand, welding in the normal oil tank 1 is continuous welding to prevent damage to the bearing shoe sliding surface due to sludge (metal powder, metal pieces, etc.) being pulled out from the unwelded area after welding. Therefore, the welding inside the bracket should be continuous welding, but as mentioned above, the work area inside the bracket is narrow, and as shown in Figure 2, there are many structures inside the bracket. This means that there will be many welding points for connecting objects. Therefore, welding tends to be discontinuous due to poor workability, and there are unwelded parts. In the worst case scenario, there was a possibility that one generator would have to be stopped due to the blades being caused to J7j f'gj.

[Purpose of the invention]

The purpose of the present invention is to facilitate the welding work of the oil supply pipe that supplies cooled lubricating oil to the sliding surface of the bearing shoe, thereby preventing burnout of the bearing 7 due to sludge extraction and damage to the externally installed pump rotating blade. The purpose of the present invention is to provide a thrust bearing device that prevents this.

[Summary of the invention]

The gist of the present invention is that the tip of the oil supply pipe is provided on the inner wall of the bracket, the pipe to which cooled lubricating oil is supplied, the ladder provided to the ring provided at the tip of this pipe, and the ladder and slide to this ring. This is because it is formed with branch pipes that communicate with the moving surface.

[Embodiments of the invention]

An embodiment of the present invention is shown in FIGS. 3 and 4. In this embodiment, the oil supply pipe 8 is provided with its tip on the inner wall of the bracket 6,
It is formed by a pipe 8f to which cooled lubricating oil 9' is supplied, a ring header 81 provided at the tip of this pipe 8f, and a branch pipe 8j that communicates the ring header 81 with the sliding surface of the bearing shoe 3. be done. That is, a pipe 8f for guiding the lubricating oil 9' cooled by the oil cooler P is provided so that its tip is located on the inner and outer walls of the triangular annular body of the bracket 6, and a link is attached to the tip of the pipe 8f. A header 81 is provided. A branch pipe 8j is provided to communicate the ring header 81 and the sliding surface of the bearing shoe 3. By doing this, most of the structures of the oil supply pipe that supplies cooled lubricating oil to the sliding surface of the bearing shoe 3,
Since it is installed on the inner and outer walls of the triangular annular body of the bracket 6, the work area for welding the structures constituting the fuel supply pipe is wide, and work efficiency is improved. For this reason, the welding between structures that form one oil supply pipe is continuous welding, and it is necessary to prevent burnout of the IIBII Uke/knee 3 due to the extraction of sludge that occurs during discontinuous welding. Can be done.

〔Effect of the invention〕

According to the present invention, the welding work between the structures forming the oil supply pipe becomes easy, and a thrust bearing device in which the oil supply pipe structures can be easily welded together can be obtained.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional thrust bearing device, and Figure 2 is a vertical cross-sectional view of a conventional thrust bearing device.
3 is a longitudinal sectional view of one embodiment of the thrust bearing device of the present invention, and FIG. 4 is a plan view of FIG. 3. 6... Bracket, 8... Oil supply pipe, sg, si
...No. 1 Prisoner No. 2 Zuho 4 mouths

Claims (1)

[Claims] 1. A runner fixed to a rotating shaft and divided into a plurality of parts in the circumferential direction, a bearing shoe that makes sliding contact with the runner, a pivot that swingably supports this bearing shoe, and this pivot. an annular bracket supported through a frame; the bracket is provided in a lubricating oil tank surrounding the bearing shoe; and the lubricating oil is provided on the sliding surface of the runner and the bearing shoe. The thrust bearing device is supplied with oil via an oil supply pipe, the oil supply pipe having a tip thereof installed through an inner wall of the bracket, a ring header provided at the tip of the oil supply pipe, and the ring header. A thrust bearing device characterized in that it comprises a branch pipe that communicates with the sliding surface.