JPS63302183A - Bearing cooling device for horizontal shaft water turbine generator - Google Patents

Abstract

PURPOSE:To enable cooling water in water pass to flow through a water pass pipe, by a method wherein a drain port is situated so that a distance in a radial direction from the center of a rotary shaft in a drain port can be adjusted to a value equal to or exceeding a distance in a radial direction from the center of a rotary shaft in an intake port. CONSTITUTION:The end part on the headrace side of each of a plurality of water pass pipes 27 in a rotary shaft heat pipe 6 is extended and bent radially outwardly. The tip is further bent in a horizontal direction to form an S-shape. A drain port 30 is situated so that a radial distance from the center of a rotary shaft in a drain port 30 at the tip of the water pass pipe 27 is adjusted to a value equal to or exceeding a radial distance from the center of a rotary shaft in on intake port 18. This constitution forces cooling water in the water pass pipe 19 to enter through the intake port 18 and be discharged through the drain port 30 to headrace 16 by means of the water pass pipe 27. The passage of water through the water pass pipe 27 causes cooling of working steam in a steam space 7 for condensation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to a bearing cooling device that utilizes a rotating shaft and a dowel of a horizontal-shaft water turbine generator.

[Prior Art] 1. FIG. 2 is a vertical cross-sectional view of a bearing cooling device for a horizontal shaft water turbine generator according to a conventional example, and FIG. 3 is a detailed cross-sectional view of the main part of FIG. 2.

In FIGS. 2 and 3, the rotating shaft heat vibro directly connected to the runner 5 is horizontally supported by a journal bearing 1 and a thrust bearing 3 housed in a bearing stand 2, and the other end of the rotating shaft heat vibro is not shown. connected directly to the generator.

The bearing stand 2 is filled with lubricating oil 4.

In FIG. 2, 8 is a casing, 9 is a speed ring, 10 is a guide vane, 11 is an upper lid, and 12 is a suction pipe. The rotating shaft heat vibro is a hollow rotating shaft 6 with a working fluid 13 sealed inside it.The journal bearing 1 and thrust bearing 3 sides are used as heat generating parts (evaporation parts), and the runner 5
The steam space on the side is used as a cooling part (condensation part), and an L-shaped water passage pipe 17 is installed in the steam space 7 near the runner 5 side of the rotating shaft heat vibro. There are multiple books installed in. This water pipe 17
Water is taken from the water intake 018 that opens in the radial direction to the water passage 19 formed between the rotating shaft and the back side of the runner 5 on the outer periphery of the pipe 6 and the upper cover 11, and passes through the straight part of the water pipe 17. It is discharged from a drainage port that penetrates the runner 5 and opens horizontally on the suction pipe 12 side.

In this bearing cooling device, most of the heat generated in the bearing parts 1 and 3 flows into the rotating shaft heat vibro as working steam.
It moves to the runner 5 side where the temperature drops, releases heat to the wall surface of the rotating shaft heat vibro, and condenses it. At this time, the heat transferred to the wall surface is radiated from the inside of the rotating shaft to the outside of the water passage portion by heat conduction.

On the other hand, cooling water to the water pipe 17 leaks from the gap between the runner 5 and the upper cover 11 and is collected in the water flow pipe 19. The vapor of the working fluid 13 in the heat vibro is cooled and condensed. The water that has cooled the vapor of the working fluid flows to the suction pipe 12 side. Further, the liquid in which the vapor of the working fluid is condensed is returned to the bearing side, which is the heat generating part, by centrifugal force.

[Problem that the invention seeks to solve]

In the bearing cooling device described above, the water pressure at the water intake port 18 opened in the radial direction of the water pipe 17 increases due to the rotation of the rotary shaft 6, and the difference between the water pressure in the water flow channel 19 becomes smaller.
On the other hand, the internal pressure in the water intake 018 becomes higher, so the water cooling function in which the water in the water passage 19 flows from the water intake 018 through the water pipe 17 and is discharged from the drainage port to the water channel 16 side is lost. There was a drawback to that.

In view of the above-mentioned drawbacks, the present invention aims to improve the structure of the water pipe so that the water pressure at the drain port I is equal to or higher than that of water 018 and flows into the water pipe n.

[Means for solving problems]

In this invention, in order to achieve the above-mentioned object, the structure of the water pipe is as follows. In other words, the drainage side ends of a plurality of water pipes are each bent radially outward, and the ends of the bent water pipes are bent horizontally to allow water to drain from the drain port into the waterway. The drain port is arranged such that the radial distance from the center of the rotation shaft is equal to or greater than the radial distance of the water intake from the center of the rotation shaft.

[Effect]

By arranging the drain port of the water pipe so that the radial distance of the drain port from the center of the rotating shaft is equal to or longer than the radial distance from the center of the water intake rotating shaft, the water pipe On the drainage side of the pipe, a centrifugal force equal to or greater than that on the water intake side is generated to cause the cooling water in the water pipe to flow.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, and the same parts as in FIG. 3 are designated by the same reference numerals and their explanation will be omitted. This embodiment differs from the conventional structure.

The ends of the water pipes n in the rotating shaft heat vibro are extended and bent radially outward, and the tips are further bent horizontally to form an S-shape as shown in the diagram. Form the drain port (9) at the tip of this water pipe.
The point is that the drain port No. ζ is arranged so that the radial distance from the center of the rotation axis of the water intake 018 is equal to or greater than the radial distance from the center of the rotation axis of the water intake 018.

For each water pump configured in this way, a water flow channel 19 is provided.
The cooling water enters from the water intake port 18, passes through the water pipe n, and is discharged from the drainage port into the waterway 16. By passing water through the water pipe n, the working steam is cooled and condensed in the steam space 7.

〔Effect of the invention〕

According to this invention, in order to eliminate the influence of pressure increase due to centrifugal force at the radial water pipe water intake that takes in the cooling water of the water flow channel, the drain side end of the water pipe is bent outward, and the tip of the water pipe is bent outward. By bending horizontally to drain water from the drain port, and making the radial distance of the drain port from the center of the rotating shaft approximately equal to or greater than the radial distance from the center of the rotating shaft of the water intake port, the water can be drained from the water intake side. It is possible to generate a centrifugal force equal to or greater than that of the cooling water in the water passage and to flow the cooling water through the water pipe.This water flow cools and condenses the working steam in the steam space, so the cooling part of the rotating heat pipe ( The condensing section) has the effect of functioning sufficiently.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a bearing cooling device which is an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of a bearing cooling device of a conventional horizontal shaft turbine generator, and Fig. 3 is a main part of Fig. 2. It is a detailed sectional view. l: Journal bearing, 3 Nilus thrust bearing, 5: Runner,
6: Rotating shaft (rotating shaft heat pipe), 13: Working fluid, 1
6: waterway, 17, 27 = water pipe. 18: Water intake, 20, 30: Drainage. Figure 1

Claims (1)

[Claims] 1) A hollow rotating shaft directly connected to the runner is horizontally supported by a journal bearing and a thrust bearing outside the casing, and the journal bearing and the thrust bearing are used as a heat generating part (evaporation part) inside the hollow rotating shaft, The runner exposed to the water channel is used as a cooling part (condensing part), and the working fluid is sealed to form a rotating shaft heat pipe. A horizontal shaft water turbine power generator equipped with a plurality of water pipes that take in water from an intake port that opens into a water flow channel formed between the shaft seal and drain the water into a waterway from a drain port that penetrates the runner and opens on the suction pipe side. In the machine, the drainage side ends of the water pipes are each bent radially outward, and the bent ends of the water pipes are bent horizontally to drain water from the drain port. A bearing cooling device for a horizontal shaft water turbine generator, characterized in that a drain port is arranged such that a radial distance from the center of the rotation shaft is equal to or greater than a radial distance from the center of the rotation shaft of the water intake.