JPH0245660A - Bearing cooling device for cylindrical type water wheel power generator - Google Patents

Abstract

PURPOSE:To eliminate the need of maintenance by obviating the need of a special water supply device and an oil cooler by introducing the lubricating oil on a bearing into an oil tank having an inspecting shaft of double wall structure and cooling said lubricating oil by cold water. CONSTITUTION:A lubricating oil inlet 11 is formed in the lower part of an inspection shaft 6, and a lubricating oil outlet 12 is formed in the upper part. An oil guide 6c which is set aslantly between an inspection shaft outer cylinder 6a and an inspection shaft inner cylinder 6b. Lubricating oil is introduced from the lubricating oil inlet 11 and gradually rises along an oil guide 6c in an oil tank 16, and reaches a thrust bearing 4, passing through a piping 17 from a lubricating oil outlet 12. At this time, the lubricating oil is cooled by the water flowing on the outer periphery of an oil tank 16. Therefore, the lubricating oil is cooled by the flowing water which flows on the outer periphery of the oil tank 16. Therefore, the lubricating oil on a bearing 4 can be cooled without installing a special oil cooler and water feeding device. Therefore, the maintenance and inspection for the bearing cooling device can be made unnecessary.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a bearing cooling device for cooling the bearings of a cylindrical water turbine generator.

[Conventional technology]

FIG. 3 is a layout diagram showing a conventional bearing cooling device for a cylindrical water turbine generator. A generator stator 2, a generator rotor 3, and a thrust bearing 4 are accommodated in the cylindrical valve 5, and the water turbine runner 1 is rotated by flowing water to drive the generator rotor 3. Reference numeral 6 denotes a cylindrical inspection shaft provided in the valve 5, which is used to go in and out of the valve to inspect the inside of the cylindrical water turbine generator. Rotating parts such as the water turbine runner 1 and the generator rotor 3 are supported by one bearing each placed on the water turbine side and the generator side. Compared to other horizontal shaft turbines, cylindrical water turbines have a large water thrust relative to the turbine output, so the thrust bearing generates a large amount of heat, making it difficult to apply self-contained self-cooling bearings that dissipate heat from the bearing surface. It is customary to use a forced lubrication system with an external oil cooler and oil circulation system. Inspection shaft 6 from thrust bearing 4 to external oil collection tank 10
The lubricating oil was circulated by an electric pump 8 through piping, and an oil cooler 9 was placed in the middle of the piping, and the oil cooler 9 was cooled by being supplied with water from the water supply device 7.

[Problem to be solved by the invention]

However, the conventional bearing cooling system described above requires a water supply system consisting of a strainer, a sand separator, and an electric pump in order to send cooling water to other oil coolers, resulting in a complicated cooling system. As a result, there were the following drawbacks. (1) These auxiliary machines raise the price of the cylindrical water turbine generator, making the equipment expensive. (2) The number of regular maintenance and inspection items increases, making maintenance and inspection time-consuming. (3) In areas where there is a heavy influx of fallen leaves, or where there is significant soil and sand mixed in during floods, the strainer itself may become clogged, requiring the machine to be stopped and cleaned, reducing the annual operating rate. An object of the present invention is to provide a bearing cooling device that cools bearing lubricating oil using running water for power generation, does not require a special water supply device or oil cooler, and does not require maintenance.

[Means to solve the problem]

In order to achieve the above object, according to the present invention, the inspection shaft protruding below the valve of the cylindrical water turbine generator has a double wall structure to form an oil tank, and the oil tank and the bearing of the cylindrical water turbine generator This is achieved by providing two pipes connecting the oil tank, cooling the lubricating oil in the oil tank by running water flowing around the outer circumference of the valve, and circulating the lubricating oil in the oil tank to the bearing.

[For use]

In this invention, the inspection shaft has a double-walled structure to form an oil tank, and the lubricating oil for the bearing is guided to this oil tank and cooled by running water. This eliminates the need for a special oil cooler and water supply device, making maintenance and inspection of auxiliary equipment easy. become.

【Example】

Embodiments of the present invention will be described below based on the drawings. 1st
The figure is a layout diagram showing a bearing cooling device for a cylindrical water turbine generator according to an embodiment of the present invention, and the same parts as in FIG. 3 are given the same numbers. In FIG. 1, a water turbine runner 1 is rotated by running water to drive a generator rotor 3. valve 5
A generator stator 2, a generator rotor 3, and a thrust bearing 4 are accommodated therein, and a cylindrical inspection shaft 6 is provided below the valve 5 and projects into the flowing water. This inspection shaft 6 has a double structure consisting of an inspection shaft outer cylinder 6a and an inspection shaft inner cylinder 6b to form an oil tank 16, and this oil tank 16 and the thrust bearing 4 are connected by two pipes 17. . FIG. 2 is a plan view of the inspection shaft 6 shown in FIG. 1, as seen from the inner cylinder side of the inspection shaft.
There is a lubricating oil outlet 11 below the inspection shaft 6, and a lubricating oil outlet 12 above it. There is an oil guide 6C running diagonally between the inspection shaft outer cylinder 6a and the inspection shaft inner cylinder 6b, and lubricating oil enters from the lubricating oil port 11 and gradually rises inside this oil tank 16 along the oil guide 6c. Exit 1
2, passes through a pipe 17 and reaches the thrust bearing 4. During this time, the lubricating oil is cooled by running water flowing around the outer periphery of the oil tank 16. 13 is an air vent for the oil tank 16. The lubricating oil in the thrust bearing 4 is circulated between the oil tank 16 and the oil tank 16 through the piping 17 due to the bearing's self-pumping action. When the rotational speed of the generator is low (the self-pumping action of the bearing is not sufficient), an electric pump is installed in the valve to circulate lubricating oil between the bearing and the bearing. The inspection shaft of the water turbine generator has a double structure to form an oil tank, and the lubricating oil for the bearings is led to the oil tank via piping and cooled by running water, so there is no need for a special oil cooler or water supply device. It is possible to cool the lubricating oil of the bearing.Therefore, maintenance and inspection of the bearing cooling device can be made unnecessary.

[Brief explanation of the drawing]

Fig. 1 is a layout diagram showing a bearing cooling device for a cylindrical water turbine generator according to an embodiment of the present invention, Fig. 2 is an exploded view of the inspection shaft of Fig. 1, and Fig. 3 is a cylindrical water turbine generator according to a conventional example. FIG. 3 is a layout diagram showing a bearing cooling device of FIG. 4 Ni-last bearing, 5: Valve, 6: Inspection shaft, 6
a: Inspection shaft outer cylinder, 6b: Inspection shaft outer cylinder, 16
: Oil tank, 17: Piping.

Claims (1)

[Claims] 1) The inspection shaft protruding below the valve of the cylindrical water turbine generator has a double wall structure to form an oil tank, and two pipes are provided to connect this oil tank and the bearing of the cylindrical water turbine generator, and A bearing cooling device for a cylindrical water turbine generator, characterized in that the lubricating oil in the oil tank is cooled by flowing water flowing around the outer periphery of the valve, and the lubricating oil in the oil tank is circulated to the bearing.