JPS6143573B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thrust bearing device, and more particularly to a thrust bearing device having a bearing pad that includes a first layer base metal and a second layer base metal, and has an oil groove on the joint surface thereof. It is.

As is well known, a plurality of bearing pads of this type of thrust bearing device used in vertical shaft water turbine generators, vertical shaft generator motors, etc. are arranged in parallel around the rotating shaft.
They are arranged concentrically with the axis of rotation so that the whole forms a circle. Each bearing pad is usually supported by a point support such as a bolt having a spherical head or by a spring or the like so that it can tilt and swing in any direction. A thrust bearing arrangement with such a bearing pad is shown in FIGS. 1 and 2. FIG.

A rotating disk 2 is fixed to the rotating shaft 1, and both are formed to rotate together. These rotating parts are supported via an oil film by a bearing pad 3 having a Babbitt metal layer 10 thereon and a pivot 5 which swingably supports the bearing pad 3. These rotating parts, bearing pad 3, pivot 5, etc., are placed in an oil tank 6 and immersed in lubricating oil 7.
Since the bearing pad 3 and the rotating disc 2 need to be cooled themselves, the oil cooled by the oil cooler 12 is pumped through the oil supply pump 14 by the pump 13 to the bearing pad, as shown by the arrow in the figure. It is designed to be forcibly refueled between 3 and 3.

On the other hand, as shown in FIG. 2, the bearing pad 3 is designed to withstand the recent increase in capacity and speed of electric machines and to have little thermal deformation. That is, the bearing pad 3 is divided into two parts in the thickness direction, and the upper part has the Babbitt metal layer 10 thereon.
It is composed of a layer base metal 8 and a lower second layer base metal 9,
The first layer base metal 8 is designed so that the first layer base metal itself is not thermally deformed; A material with good thermal conductivity is used to prevent
The layer base metal 9 is made of a thick material so as not to be deformed due to load. In this case, the second layer base metal may also be thermally deformed due to heat transfer from the first layer base metal. Therefore, in order to sufficiently prevent thermal deformation of the second layer base metal, heat due to friction loss generated on the sliding surfaces of the rotating disk 2 and the bearing pad 3 is transferred to the second layer base metal through the first layer base metal. It is necessary to prevent this from being transmitted to the base metal 9. In order to prevent heat conduction from the first layer base metal 8 to the second layer base metal 9, the first layer base metal 8 and the second layer base metal 9 are
Although it is possible to expect a heat insulating effect due to contact thermal resistance, in order to more actively insulate heat, the oil groove 11
is preferably provided on the joint surface of the first layer base metal 8 and the second layer base metal 9, and is generally formed in this way.

In order for the bearing pad 3 having the oil groove 11 configured in this way to exhibit sufficient bearing performance without causing thermal deformation, the cooling oil must flow sufficiently well in the oil groove 11 and from the first layer base metal 8 to the first layer base metal 8. It is necessary to effectively remove the heat transferred to the second layer base metal 9. By the way, in order for oil to flow in the oil groove 11, a pressure difference must be created between the oil inlet and outlet of each bearing pad 3, but generally this pressure difference is created by utilizing the rotation of the rotating disk 2. There is. However, the energy of the oil flow in the circumferential direction by the rotating disk 2 is not generated enough to flow in the oil groove 11, and the cooling oil that is forcibly supplied between the bearing pads 3 by the oil supply pipe is also generated between the bearing pads 3. In many cases, the pressure is balanced between the pads 3, and the oil does not flow in the oil groove 11 but stagnates, and even if the oil groove 11 is provided, the first layer base metal 8 and the second layer base metal 9 There was a concern that the bearing pad 3 would be thermally deformed due to insufficient cooling between the two.

The present invention has been made in view of the above points,
The object is to provide a thrust bearing device of this type that has substantially the same configuration and can sufficiently prevent thermal deformation of the bearing pad.

That is, the present invention provides an upper oil supply hole that opens toward the rotating disk side in the upper vicinity of the oil supply pipe provided between the bearing pads, and an upper oil supply hole that opens toward the rotating disk side, and that faces the bearing pads and that A side oil supply hole opened in the direction of rotation of the plate is provided, and cooling oil is supplied from the upper oil supply hole and the side oil supply hole, and the oil is supplied from the side oil supply hole between the entrance and exit of the oil groove. It is designed to create a pressure difference between the two to achieve the intended purpose.

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 3 and 4. Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, an upper oil supply hole 15 is provided at the upper part of the oil supply pipe 14a provided between the bearing pads, and a side oil supply hole 15 is provided on one side facing the bearing pad near the upper part.
7, and cold oil was supplied from both oil supply holes. In this embodiment, the upper oil supply hole 15 is provided in a closing plate 16 that closes off the upper part of the oil supply pipe 14a. By forming the structure as described above, the cooling oil is discharged from the upper oil supply hole 15 and the side oil supply hole 17 as shown by the arrows in the figure.
Due to the discharge pressure, each bearing pad 3 and oil supply pipe 1
4a, a pressure difference occurs between the gap a and b,
That is, a pressure imbalance occurs between the oil inlet and outlet of the bearing pad 3, and the cooling oil is forced to flow within the oil groove 11. According to the results of the experiment, the amount of oil that is forcibly supplied from the upper oil supply hole 15 is approximately equal to the total amount of oil supplied.
30% of the cooling oil is sprayed onto the rotating disk 2 to cool the rotating disk 2 and reduce the oil temperature at the inlet of the sliding part of the bearing pad 3. On the other hand, about 70% of the remaining cooling oil is sprayed from the side oil supply hole 17. If the oil is forced to flow into the oil groove 11, the first
The space between the layered base metal 8 and the second layered base metal 9 is well cooled, that is, heat transfer from the first layered base metal 8 to the second layered base metal 9 is prevented, and the heat of the bearing pad 3 is prevented. Deformation was sufficiently prevented.

As mentioned above, the present invention enables oil supply of the oil supply pipe,
Since the oil supply hole is formed in the upper part and the side oil supply hole is provided in one side facing the bearing pad near the top, a pressure difference is created between the oil inlet and outlet of the bearing pad. Oil flows well in the oil groove, which improves the cooling and insulation of the bearing pad, and can sufficiently prevent thermal deformation of the bearing pad.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of a conventional thrust bearing device, FIG. 2 is a sectional view taken along line A-A in FIG. FIG. 4 is a perspective view of an oil supply pipe of an embodiment of the thrust bearing device of the present invention. 1... Rotating shaft, 2... Rotating disk, 3... Bearing pad, 8... First layer base metal, 9... Second layer base metal, 1
0... Babbitt metal layer, 11... Oil groove, 14a
... Oil supply pipe, 15 ... Upper oil supply hole, 16 ...
Closing plate, 17...side oil supply hole.

Claims (1)

[Claims] 1. A rotating disk fixed to a rotating shaft, a first layer base metal having a Babbitt metal layer in sliding contact with the lower part of the rotating disk, and a first layer base metal connected to the lower part of the first layer base metal via an oil groove. a second layer base metal, a plurality of bearing pads arranged at predetermined intervals in the circumferential direction around the entire lower part of the rotating disk; and a plurality of bearing pads disposed between these bearing pads; and an oil supply pipe that supplies cooling oil to the sliding surface of the bearing pad, the oil supply pipe has an upper oil supply hole that opens toward the rotating disk side in the upper vicinity of the oil supply pipe, and an upper side surface of the oil supply pipe. A side oil supply hole is provided opposite to the bearing pad and opened in the direction of rotation of the rotating disk, and cooling oil is supplied from the upper oil supply hole and the side oil supply hole, and the side oil supply hole is A thrust bearing device characterized in that a pressure difference is created between the entrance and exit of an oil groove by supplying oil from an oil supply hole.