JPH0733817B2 - Bearing cooling device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cooling structure for a bearing that supports a rotary shaft that directly connects a horizontal turbine and a horizontal rotating electric machine.

[Conventional technology]

Generally, a water-cooled oil cooler is usually used for cooling the bearing of the horizontal axis rotating electric machine.

FIG. 5 is a vertical cross-sectional view of a conventional horizontal shaft water turbine equipped with a journal bearing and a horizontal shaft rotating electric machine (not shown) that supports a common rotary shaft, and FIG. 6 is a horizontal sectional view of the same bearing. . In the figure, the heat generated in the journal bearing 2 in the bearing 1 is absorbed by the lubricating oil O circulated by the oil circulation pump 3 arranged separately, and the heat of this lubricating oil O is a water-cooled oil cooler provided in the oil circulation circuit. At 4, the heat is radiated to the cooling water. In the figure, 5 is a rotary shaft common to the turbine and the rotating electric machine, 6 is a turbine casing, 7 is a turbine runner, and 8 is a sealing device.

[Problems to be solved by the invention]

In this type of bearing cooling device, if the water-cooled oil cooler 4 is used to cool the bearing lubricating oil O, the water supply pump 3 and the water supply device are required to supply the cooling water, which requires a facility location and increases the facility cost. However, there are some drawbacks, such as a lot of labor and maintenance work.

The present invention has been made in view of the above-mentioned drawbacks, and an object thereof is to provide a simple and inexpensive bearing cooling device which does not require facility location, expensive facility cost, and maintenance and inspection.

[Means for solving problems]

In the present invention, it is convinced that a satisfactory cooling device can be obtained by using a heat pipe without using an oil cooler for achieving the above-mentioned object, and the following arrangement is made. . That is, one end is in contact with the lubricating oil of the oil tank and the other end is higher than the one end on the outer wall of the drainage pipe that is connected to the ring that serves as a water passage for the water leakage and covers the rotating shaft between the turbine casing and the water seal device. A hollow pipe that comes into contact with each other at a position is provided to enclose the working fluid, and a heat pipe is formed with the one end side serving as a heat receiving portion and the front front other end side serving as a heat radiating portion.

[Action]

The heat of the lubricating oil in the oil tank of the bearing device is absorbed by the heat receiving part of the heat pipe, the working liquid in the heat receiving part evaporates, and this working vapor passes through the heat pipe to the heat radiating part, where the heat is drained. The working vapor is condensed into working fluid and returned to the heat receiving section.

〔Example〕

1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a side sectional view of a bearing device, FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. 4 is a sectional view of FIG. FIG. 5 is a sectional view taken along the line BB of FIG.
The same parts as those shown in FIG. 6 and FIG. 6 are designated by the same reference numerals and the description thereof is omitted. A feature of the cooling device according to the present invention is that the heat pipe 11 is used. That is, the heat receiving portion 11a of the heat pipe 11 is formed like a kind of oil cooler and is arranged near the bearing 2 to absorb the heat of the warm lubricating oil O in the oil tank 13. The heat radiating portion 11b is a ring that covers the rotating shaft 5 between the water sealing device 8 and the water turbine casing 6 that is provided on the rotating shaft 5 that seals the water leakage from the water turbine casing 6, and forms a water passage for the water leakage. It is closely fixed to the outer wall of the drain pipe 10 connected to 9, and has the function of irradiating the heat of the working steam from the heat receiving portion 11a to radiate it to the outer wall of the drain pipe 10.
It should be provided at a position higher than the heat receiving portion 11a. To explain the cooling operation of the bearing, the heat generated in the journal bearing 1 is absorbed by the lubricating oil O circulated by the viscous pump 12. The lubricating oil O that has absorbed the heat reaches the heat pipe heat receiving portion 11a forming a kind of oil cooler, and is radiated there to be cooled and returned to the oil tank 13. When the heat is transferred to the heat receiving part 11a, the heat receiving part 11a is heated, the working fluid inside is evaporated, the internal pressure of the heat receiving part 11a is increased, and the working steam moves. When the working steam reaches the heat dissipation portion, heat is released through the outer wall of the cold drain pipe 10 into the water flowing in the drain pipe 10, and at the same time, the working steam is condensed. Since the heat radiating portion 11b is provided at a higher position than the heat receiving portion 11a as described above, the working fluid condensed in the heat radiating portion 11b naturally falls due to gravity and returns to the heat receiving portion 11a again. By repeating the above cycle, the heat generated in the journal bearing 1 is cooled without using cooling water.

〔The invention's effect〕

According to the present invention, the heat receiving portion of the heat pipe releases the heat of the lubricating oil holding the heat generated in the journal bearing,
By contacting the heat radiating part of the heat pipe with the outer wall of the drainage pipe through which the cold water from the turbine flows, there is no need for a water-cooled oil cooler and no oil circulation pump, so there is no need for equipment location, maintenance and inspection. It is possible to provide a bearing cooling device with low equipment cost.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and is a longitudinal sectional view of a horizontal axis water turbine and a bearing. FIG. 2 is a longitudinal sectional view of the bearing of FIG.
FIG. 4 is a sectional view taken along the line AA in FIG. 2, and FIG. 4 is a sectional view taken along the line B- in FIG.
FIG. 5 is a sectional view taken along the arrow B, FIG. 5 is a longitudinal sectional view of a conventional horizontal shaft water turbine and bearings, and FIG. 6 is a transverse sectional view of the bearing of FIG. 2: Bearing, 5: rotating shaft, 6: casing, 8: water seal device, 10: drain pipe, 11: heat pipe. 11a: Heat receiving part, 11b: Heat dissipation part, 13:
Oil tank.

Continuation of the front page (56) Reference JP-A-55-64166 (JP, A) JP-A-55-51965 (JP, A) JP-A-62-223473 (JP, A) Actual development Sho-58-137127 (JP , U)

Claims (1)

[Claims] 1. A bearing for axially supporting a rotary shaft directly connected to a water turbine and a rotating electric machine, an oil tank for containing lubricating oil for cooling the bearing, and a sealing device for sealing water leakage from the turbine casing on the rotary shaft. In the horizontal-axis water turbine and the horizontal-axis rotating electric machine, a ring that comes into contact with the lubricating oil in the oil tank at one end and covers the rotary shaft between the water turbine casing and the water sealing device at the other end to serve as the water passage for the leaked water. On the outer wall of the drain pipe connected to, a heat pipe having a hollow pipe tightly fixed at a position higher than the one end to enclose the working fluid, the one end side being a heat receiving portion and the other end side being a heat radiating portion, A bearing cooling device characterized by being formed.