JPH0276921A - Bearing oil feed device for rotary electric machine - Google Patents

Abstract

PURPOSE:To cool a bearing unit by providing a rotating fluid reservoir, with a passage through which lubricating fluid circulates and heat is radiated, outside a fluid reservoir in which a guide bearing is housed and by circulating the lubricating fluid repeatedly. CONSTITUTION:As a rotating shaft 1 is rotated, a rotating fluid reservoir 16 mounted on it is rotated simultaneously and the lubricating fluid in the passage formed between the rotating fluid reservoir 16 and a fluid reservoir 6 is subject to a centrifugal force due to rotation of the shaft to flow the lubricating fluid outwards into the fluid reservoir through a hole 6b in the fluid reservoir 6. The lubricating fluid near a bearing 1 comes forcibly from the inside of the fluid reservoir 6 into the passage formed between the rotating fluid reservoir 16 and the fluid reservoir 6. When the hot lubricating fluid passes through the passage, it emits heat through the rotating fluid reservoir 16 into the atmosphere and, after cooled, it returns back to the fluid reservoir 6 through the hole 6b at the top of the outer surfaces of the fluid reservoir 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Field of Application)] The present invention relates to a bearing device for a rotating machine in which the heat dissipation of a lubricating fluid is improved.

(Prior art) In hydraulic machines such as water turbines and pump turbines, a guide bearing that guides a rotating shaft in the radial direction is housed in a fluid tank, and the bearing is lubricated by lubricating fluid filled in this fluid tank. That's what I do.

As a conventional bearing device for a rotating machine, one having a structure as shown in FIG. 6 is known.

In the figure, a guide bearing 2 that supports a rotating shaft 1 in its radial direction is supported by an upper cover 3. As shown in FIG.

A sealing cylinder portion 6a protruding upward from the inner end of the fluid tank 6 disposed inside the upper cover is a skirt portion 1 of the rotating shaft 1.
It is inserted into the four parts 4 formed inside the sealing mechanism 5.
is formed.

The fluid tank 6 is filled with lubricating fluid to lubricate the inner surface of the guide bearing 2.

Since this lubricating fluid is heated by the heat generated by the sliding friction of the guide bearing 2, a cooling pipe 7 is disposed in the fluid tank 6, and the lubricating fluid is cooled by a cooling medium such as water flowing in this cooling pipe. be exposed.

In FIG. 6, reference numeral 8 is a bottom plate that closes the opening of the fluid tank 6, and 9 is a fluid tank cover that stores the lubricating fluid flowing out from between the rotating shaft 1 and the bearing 2.

For example, if the arrangement of the cooling pipes in the bearing device shown in FIG. 6 is further improved and the configuration is made more compact,
As shown in the figure, the guide bearings are connected to the upper bearing 2a and the lower bearing 2.
A two-part structure of b, and four parts 10 formed between them.
It is known that a cooling pipe 7 is placed inside the
5-161921).

According to this structure, the cooling effect can be enhanced by downsizing the fluid tank and providing the cooling pipe near the heat generation source.

However, the bearing devices described above still require a cooling pipe in order to exchange heat by passing cooling fluid into the cooling pipe 7 from the outside.

Moreover, a cooling fluid supply device must also be installed, and it is difficult to apply this method when there are restrictions on the installation location of the cooling piping and the supply device.

Securing cooling fluid is also an important issue. There is no problem if high-quality fluid such as fresh water can be secured, but if not, solid matter such as earth and sand contained in the cooling fluid or plants such as algae may accumulate in the cooling pipes or the filtration of strainers etc. It accumulates in the area and causes clogging.

If this happens, the required amount of cooling fluid will no longer pass through the cooling pipe, causing the bearing temperature to rise and risking the bearing metal burning out.

In addition, chlorine ions, sulfate ions, and
There is also a risk that various ions such as nitrate ions, ammonium ions, nitrite ions, phosphate ions, and bromine ions, as well as microorganisms such as iron bacteria that eat iron and steel, may attack the filtration parts of cooling pipe strainers and cooling fluid supply equipment. .

Therefore, if a high quality cooling fluid cannot be obtained, a device is required to remove solid matter such as earth and sand, plants such as algae, or various ions and bacteria.

If this is not possible, a so-called closed circuit system is used, in which the required amount of high-quality cooling fluid is secured from outside in advance, collected after it exits the cooling pipe, cooled in a separately installed heat exchanger, and used again.・A method must be adopted.

A bearing device having a structure in which a cooling pipe is provided has the above-mentioned problems.

On the other hand, as an example in which no cooling pipe is provided, for example, as shown in FIG. The water supply pipe 11.1 passes through the water pipe 15 branching from the water supply pipe 14.
2, and the cooling fluid is sprayed into the fluid tank 6 from small holes 11a and 12a opened on the inner circumferential surface or upper circumferential surface of these water injection pipes for cooling.
-17942).

In this structure, even if a cooling pipe is not used, it is necessary to secure cooling fluid as in the above example, and in this case, the problem is how to drain the cooling fluid. Also, since heat exchange is performed on the outer surface of the fluid tank, which is the distance from the heat generation source, there is a drawback that the cooling effect is not good.

(Problems to be Solved by the Invention) As mentioned above, conventional devices require the supply and treatment of cooling water for cooling the lubricating fluid, and devices that do not use cooling pipes have low cooling efficiency. There were drawbacks.

[Structure of the Invention] (Means for Solving the Problems) A bearing device for a rotating machine according to the present invention is a guide bearing device for a rotating machine having a rotating shaft and a guide bearing. The present invention is characterized in that a rotary fluid tank is provided with a flow path for circulating lubricating fluid and dissipating heat.

(Function) In the device of the present invention configured as described above, when the rotating shaft rotates, the rotating fluid tank attached to the rotating shaft also rotates. The fluid tank housed in this rotating fluid tank is stationary because it is attached to the upper cover.

Centrifugal force due to rotation acts on the lubricating fluid in the flow path formed between the rotating fluid tank and the fluid tank, and the lubricating fluid flows out in the outer circumferential direction. When the lubricating fluid that has flowed out reaches the outermost periphery of the rotating fluid tank, it is prevented from flowing out any further, and therefore flows into the fluid tank through a plurality of holes provided on the upper outer periphery of the fluid tank.

Since the lubricating fluid flows in this way, the lubricating fluid near the bearing is pushed out and overflows from inside the fluid tank, and moves to the flow path formed by the rotating fluid tank and the fluid tank. The lubricating fluid near the bearing has a high temperature due to the transfer of heat generated by the bearing, but when the high-temperature lubricating fluid moves through the flow path formed by the rotating fluid tank and the fluid tank,
Heat is released into the atmosphere via a rotating fluid bath. As a result, the lubricating fluid that has become low temperature returns to the fluid tank through a plurality of holes provided on the upper outer periphery of the fluid tank.

The lubricating fluid cools the bearing device by repeating the circulation as described above.

(Example) Next, the present invention will be explained in detail with reference to FIGS. 1 to 5. In these figures, the same parts 1:' as in FIG. 3 are designated by the same reference numerals, and explanations of overlapping parts will be omitted unless necessary.

In FIG. 1, the inner end of the rotating fluid tank 16 is attached to the rotating shaft 1. As shown in FIG. The fluid tank 6 is attached to the upper cover 3 so as to be accommodated in the rotating fluid tank 16. Fluid tank 6
The inside is filled with lubricating fluid, and a packing 17 is installed between the rotating fluid tank 16 and the outer peripheral portion of the fluid tank 6. A plurality of holes 6b are provided on the upper outer periphery of the fluid tank 6.

In the bearing device shaft of a rotating machine having such a configuration, when the rotating shaft 1 rotates, the rotating fluid tank 16 attached thereto also rotates at the same time. On the other hand, the fluid tank 6 is stationary because it is attached to the upper cover 3.

Centrifugal force due to rotation acts on the lubricating fluid in the flow path formed between the rotating fluid tank 16 and the fluid tank 6, and the lubricating fluid flows out toward the outer circumference. The lubricating fluid that has flowed out reaches the top of the outermost periphery of the fluid tank 6. Since there is a packing 17 at the top of the outermost periphery of the rotating fluid tank 16 and the fluid tank 6, the lubricating fluid is prevented from flowing upward any further and flows into the fluid tank 6 through the hole 6b drilled in the fluid tank 6. .

Since the lubricating fluid flows into the fluid tank 6 in this way,
The lubricating fluid near the bearing 1 is pushed out and overflows from the inside of the fluid tank 6, and the rotating fluid tank 16 and the fluid tank 6 are
and into the flow path formed by.

The lubricating fluid near the bearing 1 has a high temperature due to the heat generated by the bearing 1 being transferred, but when the high-temperature lubricating fluid moves through this flow path, it transfers heat to the atmosphere via the rotating fluid tank 16. It is discharged, becomes low temperature, and returns to the fluid tank 6 through the hole 6b formed in the upper part of the outer periphery of the fluid tank 6.

Note that the arrows in FIG. 1 indicate the circulation route of the lubricating fluid.

As explained above, according to the present invention, there is no need to install cooling piping or a cooling fluid supply device in order to release heat into the atmosphere when the lubricating fluid passes through the heat radiation flow path. There is no need to secure a cooling fluid, there is no need to drain the cooling fluid, and a bearing device with high cooling effect can be obtained.

Next, another embodiment of the present invention will be described with reference to FIGS. 2 and 5.

In the embodiment shown in FIGS. 2 and 3, the rotating shaft 1
A skirt fin 18 is attached to the lower part of the skirt portion 1a. In this embodiment, when the rotary shaft 1 rotates, the skirt fins 18 also rotate, and the lubricating fluid is forcibly fed into the flow path formed between the U-turn fluid tank 16 and the bearing fluid tank 6.

This further improves the cooling effect described above.

In the embodiment shown in FIGS. 4 and 5, radial rotating fluid tank fins 20 are attached to the upper surface of the bottom plate of the rotating fluid tank 16. In this embodiment, when the rotating shaft 1 rotates, the rotating fluid tank fins 20 also rotate, and the lubricating fluid is forcibly sent to the outermost periphery of the passage between the rotating fluid tank 16 and the fluid tank receiver 6.

[Effects of the Invention] As described above, in the bearing device for a rotating machine of the present invention, there is no need for cooling piping or a cooling fluid supply device, there is no need to secure high quality cooling fluid, there is no need for cooling fluid drainage, Moreover, a bearing device for a rotating machine with a high cooling effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the main parts of a bearing device for a rotating machine according to the present invention, FIGS. 2 and 4 are longitudinal sectional views showing the main parts of other embodiments of the invention, and FIG. FIG. 2 is a cross-sectional view of the embodiment, FIG. 5 is a cross-sectional view of the embodiment shown in FIG. 4, and FIGS. 6 to 8 are longitudinal cross-sectional views showing the main parts of a conventional bearing device for a rotating machine. It is. 1...Rotary shaft skirt part 2...
...Bearing 2a...Dobe bearing 2b...Lower bearing 3...Top cover 5...Seal mechanism 6... ......Fluid tank 7...Cooling pipe 8...Bottom plate 9...Fluid 1 unit Cover 10... ...Recessed portions 11.12...Water injection pipes 11a, 12a...Small holes 13...Water sealing device 14...Water sealing water supply pipe 15 ......Piping 16...Rotating fluid tank 17...Packing

Claims (1)

[Claims] A guide bearing device for a rotating machine having a rotating shaft and a guide bearing, characterized in that a rotating fluid tank is provided outside the fluid tank housing the guide bearing, and has a flow path for circulating lubricating fluid and radiating heat. Bearing devices for rotating machinery.