JPH0914277A - Bearing device for vertical rotating machine - Google Patents

Abstract

PURPOSE: To provide a bearing device for a vertical rotating machine, that is an air-cooled type by self-ventilation and compact as a whole. CONSTITUTION: An oil circulating passage is so formed that oil in an oil tank 1 is fed to an automatic aligning thrust bearing 5 by an oil pump 2 and that the oil is returned into the oil tank 1 by a return pipe 7. A cooling fin 13 is provided at the periphery of the return pipe 7, and the oil tank 1 is provided with cooling pipes 10 vertically piercing the oil tank 1. The oil becoming high in temperature in the automatic aligning thrust bearing 5 is therefore cooled twice in the cooling fin 13 by the air blasting (cooling air) of blades 9 and in the cooling pipes 10. An adjusting screw 3 is provided at the intermediate part of an oil passage 11 reaching the automatic aligning thrust bearing 5 from the oil pump 2, and the circulating oil quantity is adjusted to the optimum oil quantity by the adjusting screw 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for a vertical rotating machine, and is particularly useful when applied to a large-sized and high-speed vertical rotating machine (motor or generator).

[0002]

2. Description of the Related Art In the case of a relatively small vertical rotating machine, as shown in FIG. 2, it is possible to sufficiently cool the bearings 31 and 32 by simply circulating oil (see the arrow in the figure). Yes, but large, high-speed vertical rotating machines (for example, thrust load 12
In the case of a ton, dN value of 170,000), the bearing loss becomes several KW and a special cooling means is required.

[0003] Therefore, in such a large-sized rotating type vertical rotating machine, conventionally, a separate circulation type lubricating unit (hydraulic pump, tank, water cooler is internally provided) is provided, or in the oil tank 21 of the bearing device shown in FIG. It had a water-cooled tube inside.

The outline of the bearing device shown in FIG. 3 will now be described. As shown in FIG. 3, an oil tank 21 is provided around the rotary shaft 12.
Is provided, and the oil in this oil tank 21 is
The path 11 (including the rotating portion 2a and the fixed portion 2b)
Is supplied to the thrust self-aligning bearing 5 via the return pipe 27 and then returned to the oil tank 21 via the return pipe 27. In addition, as described above, a water-cooled pipe is installed inside the oil tank 21.

[0005]

However, in the bearing device according to the above-mentioned prior art, since it is a water-cooled type, cooling water is used, so piping for it is required, and management items such as water leakage, water amount, water temperature, etc. are required. Many were extremely disadvantageous in terms of cost and maintenance.

Further, if the bearing device shown in FIG. 1 is simply air-cooled by self-ventilation, since the flow rate is small, the surface area is increased to increase the cooling capacity, resulting in a large size and increased weight. .

Therefore, in view of the above-mentioned prior art, it is an object of the present invention to provide a bearing device for a vertical rotating machine which is air-cooled by self-ventilation and is compact as a whole.

[0008]

[Means for Solving the Problems] First to achieve the above object
In the invention, the oil tank provided around the rotation shaft, the cooling pipe penetrating the oil tank in the vertical direction, and the rotating portion coupled to the rotation shaft rotate together with the rotation shaft to remove the oil in the oil tank. An oil pump for supplying the bearing of the rotating shaft, a return pipe arranged between the bearing and the oil tank for returning the oil supplied by the oil pump from the bearing to the oil tank, and connected to the rotating shaft. It is characterized in that it is provided with a blade that rotates together with the rotating shaft and sends cooling air to the outer circumference of the return pipe and into the cooling pipe.

A second invention is characterized in that, in the structure of the first invention, cooling fins are provided on the outer circumference of the return pipe so as to come into contact with the cooling air.

A third aspect of the invention is characterized in that, in the configuration of the first or second aspect of the invention, an adjusting screw for adjusting the amount of circulating oil is provided in the middle of the oil path from the oil pump to the bearing. And

[0011]

According to the first aspect of the present invention, by providing the cooling pipe penetrating the oil tank in the vertical direction, the surface area in contact with the cooling air is increased without increasing the size of the device. And
By cooling this cooling pipe and the return pipe at two points,
The oil can be cooled sufficiently.

Further, according to the second aspect of the present invention, by providing the cooling pipe penetrating the oil tank in the vertical direction and further providing the cooling fins provided on the outer periphery of the return pipe, the surface area in contact with the cooling air is further increased. . Then, the oil can be cooled more sufficiently by cooling at these two places of the cooling pipe and the cooling fin.

Further, according to the third aspect of the invention, by adjusting the circulating oil amount to an appropriate amount with the adjusting screw,
It is possible to easily prevent an increase in loss (oil loss power loss) in the oil pump and the bearing due to an excessive amount of circulating oil, and a burnout of the bearing due to an insufficient amount of circulating oil.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. The same parts as those in the prior art (FIG. 2) are designated by the same reference numerals.

FIG. 1 is a sectional view showing a bearing device for a vertical rotating machine according to an embodiment of the present invention. As shown in the figure, the bearing device according to the present embodiment is an air-cooling type device provided with a self-ventilation provided on an upper part of a main body 14 of a vertical rotating machine (electric motor or generator). It is configured.

An oil tank 1 is provided around a rotary shaft 12 of a vertical rotating machine, and an oil pump 2 which is a self-pump is provided in the oil tank 1. This oil pump 2 has a rotating part 2
It has a and the fixed part 2b. The rotating portion 2a is the rotating shaft 1
2 and a plurality of holes 2c are radially formed in the rotating disc thereof, and the oil in the oil tank 12 is rotated by the rotating shaft 12 so that the oil in the oil tank 12 is opened in the holes 2d of the fixed portion 2b.
Pump to. A specific gap is provided between the rotating portion 2a and the fixed portion 2b so as to face each other.
The dimensions and the number of c and 2d are set to the dimensions and the number required for the oil pump (self pump).

The oil pumped by the oil pump 2 is
It reaches the inner diameter side of the thrust self-aligning bearing 5 that supports the thrust load of the vertical rotary machine through the oil path (hole) 11.
Here, after the thrust self-aligning bearing 5 is lubricated and cooled, it is guided from the outer diameter side of the thrust self-aligning bearing 5 to the one end 7a of the return pipe 7.

The return pipe 7 has its one end 7a occupying the vicinity of the thrust self-aligning bearing 5, passes through the passage 6 for the cooling air blown by the blades 9, and has the other end 7b connected to the oil tank 1. There is. Therefore, the return pipe 6 returns the oil from the thrust self-aligning bearing 5 to the oil tank 1. The blade 9 is integrally provided on the rotary shaft 12, and by rotating together with the rotary shaft 12, the outside air is sucked and blown into the inside (cooling wind).

In order to increase the surface area in contact with the cooling air, a large number of cooling fins 13 are provided on the outer circumference of the return pipe 7 so as to come into contact with the cooling air, and the oil tank 1 is vertically moved. A large number of cooling pipes 10 penetrating therethrough are provided. Therefore, after the cooling air passes through the cooling fins 7,
Further, it passes through the inside of the cooling pipe 10. The cooling air that has passed through the cooling pipe 10 is discharged to the outside after cooling the main body 14.
After passing through the cooling pipe 10, it may be directly discharged to the outside.

An adjusting screw 3 is provided in the oil path 11 from the oil pump 2 to the thrust self-aligning bearing 5. The adjusting screw 3 is for adjusting the amount of oil supplied from the oil pump 2 to the thrust self-aligning bearing 5 (that is, the circulating oil amount).

Therefore, according to the bearing device of the vertical rotating machine having the above structure, the oil circulates through the oil tank 1, the oil pump 2, the path 11, the thrust self-aligning bearing 5, the return pipe 7 and the oil tank 1. At this time, the oil that lubricates the thrust self-aligning bearing 5 and cools it to reach a high temperature is cooled by the cooling air passing through the cooling fins 13 when passing through the return pipe 7, and the oil in the oil tank 1 is also reduced. When it returns to, the air is further cooled by the cooling air passing through the cooling pipe 10. Further, the amount of circulating oil is adjusted to an appropriate amount by the adjusting screw 3.

From the above, according to the present bearing device, the following effects can be obtained.

Even if the vertical rotating machine is large and has a high speed (for example, a thrust load of 12 tons and a dN value of 170,000),
By double cooling the cooling fins 13 and the cooling pipes 10, the oil can be sufficiently cooled by self-ventilation (cooling capacity is increased four times or more as compared with the conventional air cooling type). That is, an air-cooled bearing device by self-ventilation can be obtained. As a result, the range of air-cooled rotary machines that do not require cooling water can be expanded, and the installation work of piping, which was difficult for water-cooled types, becomes unnecessary, which shortens the construction period and eliminates the need to manage water leaks. Cost and maintenance can be saved. Moreover, the bearing device is compact without increasing in size. The adjusting screw 3 can be adjusted during operation so that the circulating oil amount becomes the optimum oil amount (as described above, when the circulating oil amount is too large, the power loss of the oil agitation becomes large, and when it is insufficient, the bearing burns out). . Since the performance of the oil pump (self-pump) has many unstable factors, it is often difficult to understand until it is completed. Therefore, it is difficult to optimally design the oil pump 2 in advance. Therefore, as described above, the provision of the adjusting screw 3 makes it possible to adjust the circulating oil amount during operation in the factory test, which is very excellent.

The cooling capacity may be further enhanced by providing a plurality of return pipes 7 or thickening the return pipes 7. Further, when the oil can be sufficiently cooled without providing the cooling fin 13, the cooling fin 13 may not be provided.

[0025]

According to the present invention, as will be described in detail with reference to the above embodiments, even a large-sized, high-speed vertical rotating machine can sufficiently cool oil by self-ventilation, and no cooling water is required. The range of air-cooled rotary machines can be expanded, cost reduction and maintenance labor saving can be achieved. Moreover, the bearing device is compact without increasing in size.

Further, the circulating oil amount can be easily adjusted to the optimum oil amount by the adjusting screw.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a bearing device of a vertical rotating machine according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a bearing device of a vertical rotating machine according to a conventional technique.

FIG. 3 is a partially cutaway front view of a vertical rotating machine equipped with a bearing device according to the related art.

[Explanation of symbols]

 1 Oil Tank 2 Oil Pump 2a Rotating Part 2b Fixed Part 3 Adjusting Screw 5 Thrust Self-Aligning Bearing 6 Cooling Air Passage 7 Return Pipe 9 Blades 10 Cooling Pipe 11 Oil Path 12 Rotating Shaft 13 Cooling Fin 14 Main Body of Vertical Rotating Machine

Claims (3)

[Claims] 1. An oil tank provided around a rotary shaft, a cooling pipe penetrating the oil tank in a vertical direction, and a rotating portion coupled to the rotary shaft rotates together with the rotary shaft to remove oil in the oil tank. An oil pump for supplying the bearing of the rotary shaft, a return pipe arranged between the bearing and the oil tank for returning the oil supplied by the oil pump from the bearing to the oil tank, and coupled to the rotary shaft A bearing device for a vertical rotating machine, comprising: a blade that rotates together with the rotating shaft and sends cooling air to the outer circumference of the return pipe and the inside of the cooling pipe. 2. The bearing device for a vertical rotating machine according to claim 1, wherein cooling fins are provided on the outer circumference of the return pipe so as to come into contact with the cooling air. 3. The bearing device for a vertical rotating machine according to claim 1, wherein an adjusting screw for adjusting the circulating oil amount is provided in the middle of an oil path from the oil pump to the bearing. Bearing device for vertical rotating machine.