JPH0341219A - Bearing cooling device - Google Patents

Abstract

PURPOSE:To eliminate complicated cooling piping and simplify a facility by connecting a heat pipe between a lubricating oil tank and the flowing water level in a turbine casing, etc., transferring to and radiating from the flowing water a heat in the lubricating oil heated by frictional heat of a bearing by means of the heat pipe. CONSTITUTION:A heat pipe 1 is inserted into a lubricating oil tank 3 at a position where the most effective endothermic can be obtained, and the opposite side of the heat pipe 1 is made in contact with flowing water through the wall of a turbine casing 2. When the heat generated in a turbine bearing 4 is accumulated in the lubricating oil in the oil tank 3 and the temperature of oil in the oil tank rises, the heat is absorbed by the heat pipe 1 and the refrigerant sealed in the pipe 1 is bolted to become steam which is moved to and cooled at a heat radiating section and returned as condensate. This procedure is made repeatedly to cool the lubricating oil in the oil tank 3. Thus, an water supply and drain facility for cooling the bearing section 4 can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bearing cooling device, and particularly to a bearing cooling device suitable for low-speed large bearings such as water turbines and pump water turbines.

[Conventional technology]

Conventional cooling devices for bearings have mainly been systems that take power generation water, so-called river water, and cool it by passing it into a lubricating oil tank through a dedicated water supply and drainage facility.

This method, as described in Japanese Patent Publication No. 63-163095, installs a bearing cooling pipe in an oil tank, transfers the frictional heat generated on the sliding surface of the bearing from the lubricating oil to the cooling pipe, and cools the cooling pipe. It has a structure that radiates heat to the outside through.

River water contains fallen leaves, dead wood, plastic debris, earth and sand, etc. In order to remove and purify these unnecessary substances, strainers and other protective devices are installed, as well as water flow. It consisted of piping equipment and various equipment for regulating and managing water flow. Furthermore, the lubricating oil tank has a complicated structure including a plurality of water pipes to appropriately dissipate heat within a limited narrow space.

[Problem to be solved by the invention]

The above conventional technology requires dedicated large-scale water supply and drainage equipment to cool the bearing, and has a structure in which complicated cooling pipes are arranged inside the bearing lubricating oil tank. Foreign objects can clog the water supply and drainage equipment, causing the main engine to stop or take time to clear the blockage, or water droplets can form in the cooling water pipes in the lubricating oil tank and get mixed into the lubricating oil, causing problems such as maintenance, inspection, and
There were some difficulties in management.

The purpose of the present invention is to eliminate the need for these maintenance inspections and management. Therefore, in order to eliminate the need for maintenance, it is necessary to eliminate the objects to be maintained. Another object of the present invention is to simplify the equipment system by eliminating the cooling water pipe structure in the lubricating oil tank, and to provide an inexpensive, high-quality bearing lubrication mechanism.

[Means to solve the problem]

In order to achieve the above objectives, we focused on the fact that a self-cooling bearing system that uses rotating heat pipes to cool the thrust bearings of horizontal shaft small-capacity water turbines has been put into practical use and has achieved good results.
This heat pipe with excellent heat transport properties is connected between the lubricating oil tank and the flowing water surface of the water turbine casing, etc., and the heat in the lubricating oil tank heated by the frictional heat of the bearing is transferred to the flowing water inside the water turbine casing etc. using the heat pipe. It is designed to transport and radiate heat. In order to further improve the heat dissipation effect,
It has multiple heat pipes installed.

[Effect]

FIG. 4 shows the operating principle of a heat pipe in which a refrigerant such as water or fluorocarbon is sealed in a pressure-regulated pipe. That is, the heated heat is absorbed by the heating portion 1h of the heat pipe 1. Refrigerant 14 sealed in the pipe
is boiled by this amount of heat, becomes steam 16, and moves to the heat radiation section 1Q, which is a lower temperature region. Since this heat dissipation section IQ section is in a state suitable for heat dissipation, the steam that has reached this section is cooled and becomes condensed liquid 18, and returns to the heating section 1h side. Cooling is achieved by this repeated action of heat absorption and heat release.

In this way, by connecting a heat pipe with heat transport properties and self-cooling ability to a lubricating oil tank and a flowing water part such as a water turbine casing, the heat generated between the main shaft and bearings is transferred to the lubricating oil, heat pipe, casing, etc. Heat can be easily dissipated through cold water. This heat transport makes it possible to eliminate the need for conventional large-scale water supply and drainage equipment for cooling the bearing.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. As shown in FIG. 1, the heat pipe 1 is inserted through the outer wall of the lubricating oil tank 3 at the position where it has the most heat absorption effect, and
The opposite side is in contact with running water through the outer wall of the water turbine casing 2, and is connected at a position where the heat dissipation effect is most effective. As shown in FIG. 4, one embodiment of the mounting part consists of a backing 7, a backing presser 8° and a tightening bolt 9, each of which has a structure to prevent leakage of lubricating oil and running water to the outside. The lubricating oil level is placed at a position suitable for absorbing rotational friction heat between the main shaft 5 and the bearing 40 of the water turbine. Therefore, when the main engine starts operating, a calorific value Q consisting of bearing loss Qb and stirring loss Qc is generated in the lubricating oil tank 3. A portion of this heat is radiated to the atmosphere through the lubricating oil outer wall, but most of it is accumulated in the lubricating oil within the oil tank. Further, when the temperature inside the lubricating oil tank rises, heat is absorbed by the heat pipe 1, and the refrigerant sealed within the pipe boils, exerting a heat transport effect. Here, K is the heat transfer rate, Tw is the lubrication temperature, To is the cooling part temperature, A is the contact area,
When N is the number of pipes, the heat radiation amount q of the heat pipe is q
" K (Tw - To) A N, it can be seen that in order to obtain a large heat dissipation effect, the larger the difference between the lubricating oil temperature Tw and the cooling part temperature To, and the larger the heat transfer rate, the better. Therefore, According to this embodiment, since the cooling part is in contact with the flowing water of the casing, the temperature difference and heat transfer rate are large, and the cooling effect is remarkable.Furthermore, the steam boiled in the heat absorption part is easy to move, In addition, heat transfer loss can be reduced by installing a heat pipe at a slightly upward slope on the heat dissipation section in a suitable state so that the steam that reaches the heat dissipation section is easily returned to the heat absorption section as a cooled condensate. Fig. 2 shows a modification of the above-described embodiment.A water intake pipe 10 is attached to the water wheel top cover 6 provided with a cooling water intake.
0 is provided with a valve 11 for adjusting the amount of cooling water. Further, a water receiver ↓2 is provided at the upper part of the water intake pipe 10 to ensure an appropriate amount of cooling water and from which an appropriate amount can flow out. A cooling water discharge port is provided in the upper part of the water receiver 12, and a discharge pipe 13 is connected to a position suitable for discharge from the water turbine cover 6. In addition, at the bottom of the cooling water outlet of the upper water receiver 2, there is a fourth pipe connected to the heat pipe connected from the lubricating oil tank 3.
Connect as shown in the diagram. The cooling effect after the main engine is started is as described above. In the embodiment shown in FIG. 2, since the length of the heat pipe 1 can be shortened, heat transfer loss can be reduced, and furthermore, a large cooling effect can be obtained.

Further, FIG. 3 shows an example in which the present invention is applied to a Kabran water turbine. The structure is such that the heat pipe 1 is removed between the outer wall of the lubricating oil tank 3 and the water wheel top cover 6, and the structure for preventing external leakage of lubricating oil and running water is the same as that shown in FIG. 4 described above. Thereby, heat exchange is performed between the lubricating oil in the lubricating oil tank 3 and the flowing water near the water wheel upper cover 6 using the heat pipe 1, and the lubricating oil in the lubricating oil tank 3 is cooled. FIG. 6 shows a modification of the heat pipe structure. On the heat-receiving side, a heat-absorbing tank 9 having a size suitable for obtaining a suitable heat-absorbing effect is provided, and a pipe 1u for transferring vapor after boiling of the refrigerant is connected to the upper part of the heat-absorbing tank 9.

On the heat dissipation side, a condensate transfer pipe ld is connected to the upper part of the heat dissipation tank 20, which is sized to obtain a suitable heat dissipation effect. A condensate transfer pipe ↓d is connected to the lower part of the heat radiation tank 20 so that the condensate that has been forcibly cooled by external cooling water can be circulated to the heat absorption tank 19. With such a heat pipe structure, since the passages for steam and condensate are independent, passage loss can be reduced, and a greater cooling effect can be obtained. The method of attaching the heat pipe is the same as that shown in FIGS. 1 to 3.

〔Effect of the invention〕

According to the present invention, since the cooling effect of the bearing part can be suitably carried out by the heat pipe alone, there is no need for large-scale water supply and drainage equipment dedicated to cooling the bearing, and the equipment cost can be reduced, thereby providing an inexpensive hydraulic mechanical equipment. I can do it.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, FIG. 2, FIG. 3 is a cross-sectional view of another embodiment of the present invention, FIG. 4 is a cross-sectional view showing a heat pipe connection situation, and FIG. FIG. 6, an explanatory diagram of the heat transport principle of a heat pipe, is an explanatory diagram of a heat pipe for further increasing the heat conduction effect. 1...Heat pipe, 2...Water wheel casing, 3.
...Lubricating oil tank, 4...Water wheel bearing, 5...Water wheel main shaft,
6...Water wheel top cover, 7...Backing, 8...
Backing presser foot 9...tightening bolt.

Claims (1)

[Claims] 1. A bearing for smoothly stopping the behavior of a rotating shaft, and a bearing support capable of fixing the bearing in a suitable state;
In a bearing structure of a hydraulic machine consisting of a lubricating oil that dissipates frictional heat between the rotating shaft and the bearing, and a lubricating oil tank that stores the lubricating oil, the inside of the lubricating oil tank and a flowing water surface of a water turbine casing or a water turbine cover, etc. In between, one or more heat pipes are installed to optimize heat dissipation, eliminating the need for conventional cooling water pipes for cooling bearing lubricating oil and water supply and drainage equipment for these, and making the lubricating oil tank unique. A bearing cooling device characterized by having a cooling function.