JPH09329135A - Thrust bearing device for vertical shaft rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure an appropriate oil film pressure between a rotary plate and a static plate so as to stabilize the performance of a bearing by forming the shape of the joints of the split rotary plate, of a vertical surface and a horizontal surface arranged in the vicinity of the sliding surface side of the rotary plate. SOLUTION: A bearing device is equipped with a plurality of static plates 3 arranged around the circumference of a main shaft 2 and a split rotary plate 20 arranged on an upper side by being opposed to the static plates 3. Joints 21 formed on both sides of a pair of split surfaces of this rotary plate 20 respectively comprise two vertical surfaces 21a, 21b and a horizontal surface 21c. Then, during operation, the sliding surface side of the rotary plate 20 increases its temperature higher than a mounting surface side in a thrust collar 2a by frictional heat due to the sliding between the rotary shaft 20 and the static plates 3, and the sliding surface sides of the joints 21 are going to be opened by thermal expansion, however, the horizontal surface 21c arranged in the vicinity of the sliding surfaces of the joints 21 of the rotary plate 20 is tightly stuck to the sliding surface sides, thereby the mutual displacement of the static plates 3 and the rotary plate 20 can be suppressed and a clearance between the joints 21 can be kept zero. Therefore, an appropriate oil film pressure can be ensured among the rotary plate 20 and the static plates 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust bearing device for a vertical axis rotating electric machine such as a turbine generator.

[0002]

2. Description of the Related Art As a thrust bearing device for a vertical axis rotating electric machine which has been generally used, it has been considered that the thrust bearing device has a disassembled and assembled structure.
A rotating plate with a divided structure is often adopted.

FIG. 4 shows a thrust bearing device of a conventional vertical axis rotating electric machine which adopts the rotary plate 1 of the two-division structure, and includes a plurality of stationary plates 3 arranged around a spindle 2. And a rotary plate 1 having a two-divided structure provided on the upper side so as to face the stationary plate 3. The stationary plate 3 is arranged on a bearing stand 5 via a spring 4, and the bearing stand 5 is fixed on a bearing bracket 6. In addition, the rotary plate 1 is
A plurality of tightening bolts 7 are attached to the thrust color portion 2a of the main shaft 2. Reference numeral 8 indicates a lubricating oil that lubricates these members.

[0004]

A rotary plate 1 having a two-part configuration.
As shown in FIG. 5, the seam 1a is machined vertically to the sliding surface 1b with high accuracy so that the seam clearance when the rotary plate 1 is attached to the thrust collar portion 2a becomes zero. I am doing it. However, during operation, the sliding surface 1b side of the rotating plate 1 becomes higher in temperature than the mounting surface side of the thrust color portion 2a due to frictional heat generated by the sliding motion of the rotating plate 1 and the stationary plate 3, and therefore thermal expansion causes the joint to move. The slip surface 1b side opens, and as shown in FIG. 6, a phenomenon of generating a skimmer 1c occurs.

In the thrust bearing device, the lubricating oil 8 enters between the rotary plate 1 and the stationary plate 3 to generate an appropriate oil film pressure to support the thrust load, but at the joint of the rotary plate 1. When the skimmer 1c is generated, the oil film pressure in this portion is greatly decreased, the bearing performance is deteriorated, and a problem such as bearing burnout may be caused.

In order to cope with such a problem, conventionally, as shown in FIG. 7, a method of tightening the joint 1a of the rotary plate 1 by using both screw bolts 9, a special nut 10 and a special washer 11 has been studied. However, this method has the following drawbacks.

(1) Since the tightening parts 9, 10, 11 are built in the rotary plate 1, the drill holes 12, 13, shown in FIG.
It is economically disadvantageous because the processing of 14 is required, which is troublesome, the fastening parts are expensive, and a special tool is required for the fastening work.

(2) Rotating plate 1 having a relatively small thickness
In this case, since the strength of the rotary plate itself is remarkably reduced due to the built-in tightening parts 9, 10 and 11, it cannot be adopted.

(3) As shown in FIG. 9, the tightening bolt 9
It is difficult to arrange such elements very close to the sliding surface side of the rotating plate for reasons of strength and size, and therefore the gap 1 of the joint due to thermal expansion on the sliding surface side of the rotating plate 1
It is impossible to completely eliminate the occurrence of c.

For the above reasons, the method using the fastening parts has not been sufficient as a means for solving the problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a thrust bearing device for a vertical axis rotating electric machine, which has a rotary plate having a simple structure and in which a seam gap does not occur and which can maintain stable bearing performance. .

[0012]

A thrust bearing device for a vertical axis rotating electric machine according to the present invention includes a plurality of stationary plates arranged around a main shaft and two stationary plates disposed above the stationary plates so as to face each other.
In a thrust bearing device provided with a rotating plate having a divided structure, the joint shape of the rotating plate is configured by a vertical plane and a horizontal plane provided near the sliding surface side of the rotating plate. is there.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the thrust bearing device for a vertical rotating electric machine according to the present invention, a phenomenon in which the seam of the rotating plate tries to open due to thermal expansion on the slip surface side is provided near the slip surface side of the seam. Since the horizontal surfaces are in close contact with each other, the mutual changes are suppressed, so that it can be prevented. In the present invention, as described in claim 2, the joint shape of the rotary plate is two vertical planes and a horizontal plane connecting between the edges of the two vertical planes near the sliding surface side of the rotary plate. Can be composed of

[0014]

Embodiments of the present invention will be described below with reference to FIGS.

The thrust bearing device for a vertical axis rotating electric machine according to the present invention has a plurality of stationary plates 3 arranged around the main shaft 2 and a two-divided structure provided on the upper side so as to face the stationary plates 3. And a rotating plate 20. The stationary plate 3 is arranged on a bearing stand 5 via a spring 4, and the bearing stand 5 is fixed on a bearing bracket 6. Also, the rotary plate 20
Is attached to the thrust collar portion 2a of the main shaft 2 by a plurality of tightening bolts 7.

As shown in FIGS. 2 and 3, the seams 21 formed on both sides of the pair of divided surfaces of the rotary plate 20 have two vertical planes 21a and 21b, respectively, and a horizontal plane connecting the edges thereof. 21c. The two vertical planes 21a and 21b are formed at a slight interval in the circumferential direction of the rotary plate 20 (these are equal to the width of the horizontal plane 21c), and the upper end of the vertical plane 21a is on the upper surface of the rotary plate 20. The lower end of the vertical surface 21b is in contact with the lower surface of the rotary plate 20. Further, the edges on the other end side (inner end side) of these vertical surfaces 21a and 21b are connected by a horizontal surface 21c. In addition,
The height of the vertical surface 21a is considerably higher than the height of the vertical surface 21b, and therefore, the position of the horizontal surface 21c is set to the rotary plate 20.
It is formed near the slip surface 20b.

The rotary plate 20 has a plurality of tightening bolts 7 attached to the thrust collar portion 2a of the main shaft 2 in a state where the joints of the vertical planes 21a and 21b and the horizontal plane 21c are in close contact with each other.
It is attached by.

In the thrust bearing device of the present invention constructed as described above, the sliding surface 20b side of the rotary plate 20 is moved to the thrust color portion 2a by frictional heat generated by the sliding of the rotary plate 20 and the stationary plate 3 during operation. The temperature becomes higher than the mounting surface side,
The slip surface side of the seam tries to open due to thermal expansion, but a horizontal surface 21c provided near the slip surface of the seam of the rotary plate 1
By closely contacting each other, mutual displacement is suppressed, and it is possible to keep the joint gap at zero.
Therefore, an appropriate oil film pressure can be secured between the rotating plate and the stationary plate, and problems such as bearing burnout can be prevented.

[0019]

As described above, according to the present invention, it is possible to secure an appropriate oil film pressure between the rotary plate and the stationary plate by preventing the occurrence of the seam gap during the operation of the rotary plate of the two-division structure. Therefore, it is possible to provide a highly reliable thrust bearing device for a vertical axis rotating electric machine having stable bearing performance.

[Brief description of drawings]

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

FIG. 2 is a plan view showing an embodiment of a rotary plate in the device of the present invention.

3 is a vertical cross-sectional view showing the joint shape of the rotary plate in FIG.

FIG. 4 is a sectional view showing an example of a conventional thrust bearing device for a vertical axis rotating electric machine.

FIG. 5 is a vertical cross-sectional view showing a joint shape of a rotary plate in a conventional thrust bearing device.

FIG. 6 is a vertical cross-sectional view showing the behavior of a conventional rotating plate during operation of the seam.

FIG. 7 is an explanatory view illustrating a conventional joint tightening method for a rotary plate.

FIG. 8 is a cross-sectional view taken along the line I-I of FIG.

9 is a vertical cross-sectional view showing the behavior during operation of the seam of the rotary plate of FIG.

[Explanation of symbols]

 1, 20 ... Rotating plate 1b, 20b ... Sliding surface 1c ... Skimmer 2 ... Main shaft 2a ... Thrust color part 3 ... Stationary plate 4 ... Spring 5 ... Bearing base 6 ... Bearing bracket 7 ... Tightening bolt 8 …… Lubricating oil 9,10,11 …… Tightening parts 12,13,14 …… Drill hole 20b …… Slip surface 21 …… Match 21a, 21b …… Vertical surface 21c …… Horizontal surface

Claims (2)

[Claims] 1. A thrust bearing device comprising: a plurality of stationary plates arranged around a main shaft; and a rotating plate having a two-divided structure arranged above the stationary plates so as to face each other. 2. The thrust bearing device for a vertical rotating electric machine according to claim 1, wherein the joint shape is composed of a vertical plane and a horizontal plane provided near the sliding surface side of the rotary plate. 2. The shape of the seam of the rotary plate is composed of two vertical planes and a horizontal plane connecting the edges of the two vertical planes in the vicinity of the sliding surface side of the rotary plate. Item 3. A thrust bearing device for a vertical axis rotating electric machine according to Item 1.