JPH0449370Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a bearing device for a vertical rotating machine such as a gas compressor, and more specifically, the invention relates to a bearing device for a vertical rotating machine such as a gas compressor. Regarding bearing devices.

2. Description of the Related Art A conventional example of a bearing device for a vertical rotating machine is shown in FIG. 2, for example.

In FIG. 2, the rotating shaft 1 extends vertically inside the casing 12 of the vertical rotating machine, and
It is supported by upper and lower rolling bearings 2A, 2B. And each rolling bearing 2A,
Bearing holders 3A and 3B are interposed between the radial outer circumference of 2B and the casing 12, respectively, and these bearing holders 3A and 3B allow the rolling bearings 2A and 2B to move in the axial direction with respect to the casing 12. However, it is fixed so that it cannot move in the radial direction.

In addition, the lower bearing holder 3B and the casing 12
A spring 8 is interposed between the rollers and the bottom of the roller bearings 2A and 2B to apply pressure in the axial direction to the rolling bearings 2A and 2B. Further, a main oil tank 9 is provided at the bottom of the casing 12, and the rotating shaft 1 is contained in the lubricating oil in the main oil tank 9.
The lower end of is immersed.

Problems to be Solved by the Invention Incidentally, in a vertical rotating machine, it is not possible to completely remove the amount of unbalance of the rotating shaft, so the rotating shaft tends to move in the radial direction due to this residual unbalance.

However, in the conventional bearing device having the above-mentioned configuration, since the rotating shaft 1 is restrained from moving in the radial direction by the rolling bearings 2A, 2B and the bearing holders 3A, 3B, it is subject to rotational bending fatigue due to reaction force. There was a problem that the lifespan was short, as there was a risk of breakage when the fatigue life was reached.

The present invention was made to solve the problems of the conventional technology, and by making the rotating shaft movable not only in the axial direction but also in the radial direction, it is possible to reduce rotational bending stress generated in the rotating shaft. I did it like this,
The purpose of the present invention is to provide a bearing device for a vertical rotating machine.

Means for Solving the Problems In order to solve the above problems, the present invention supports a rotating shaft that extends vertically within the casing of a vertical rotating machine with upper and lower rolling bearings, and supports each rolling bearing. A bearing holder is interposed between the radial outer circumferential portion and the casing, and a spring is interposed between the lower bearing holder and the bottom of the casing, and a spring is interposed for applying axial pressure to the rolling bearing. In a bearing device in which the lower end of the rotating shaft is immersed in lubricating oil in a main oil tank provided at the bottom of the casing, dampers are interposed between the radial outer circumferences of the upper and lower bearing holders and the casing, respectively. A steel ball is inserted into the steel ball receiving recess formed on the upper surface of the upper bearing holder, and a steel ball receiving seat is provided in the casing to hold the steel ball from above, and a portion of the lubricating oil in the main oil tank is An oil jetting passage is formed inside the rotating shaft to suck up oil and jet it out toward the steel ball receiving recess.

Effect: According to the above means, when the rotating shaft tries to move in the radial direction due to residual unbalance, the damper between the bearing holder and the casing can be compressed, and the rotating shaft can be moved in a manner that compresses the damper between the bearing holder and the casing. The axial preload on the bearing is received by the casing via the steel balls and rigid ball seats, allowing smooth movement. As a result, the rotational bending stress acting on the rotating shaft is reduced, and the service life is significantly extended. Further, a portion of the lubricating oil ejected from the oil ejection passage of the rotating shaft enters the steel ball receiving recess and lubricates the steel balls.

An embodiment of the present invention will now be described in detail with reference to Fig. 1. In Fig. 1, the same parts as those shown in Fig. 2 are designated by the same reference numerals, and duplicated explanations will be omitted.

As shown in FIG. 1, according to the present invention, dampers 7A and 7B made of rubber or the like are interposed between the radial outer circumferences of the upper and lower bearing holders 3A and 3B and the casing 12, respectively. has been done.
Further, a steel ball receiving recess 4 is formed on the upper surface of the upper bearing holder 3A, and a steel ball 5 is placed in this recess 4. A steel ball seat 6 that presses the steel ball 5 from above is provided on the casing 12.

Therefore, when the rotating shaft 1 attempts to move in the radial direction due to residual unbalance, the bearing holder 3
Damper 7A between A, 3B and casing 12,
7B, and the axial preload on the rolling bearings 2A and 2B is received by the casing 12 via the steel balls 5 and rigid ball seats 6, allowing smooth movement. .
As a result, the rotational bending stress acting on the rotating shaft 1 is reduced, and the life of the rotating shaft 1 is significantly extended.

Furthermore, according to the present invention, the oil ejection passage that sucks up a part of the lubricating oil in the main oil tank 9 and ejects it toward the steel ball receiving recess 4 of the upper bearing holder 3A is provided on the rotating shaft 1.
It is located inside the.

That is, according to this embodiment, this oil jet passage is made up of an oil hole 10 and a plurality of oil jet holes 11A, and the oil hole 10 opens at the lower end of the rotating shaft 1, and at least the upper bearing holder 3A. The rotary shaft 1 is bored so as to extend upward in the axial direction beyond the upper surface of the rotary shaft 1. Then, at a level slightly higher than the upper surface of the upper bearing holder 3A, a plurality of oil spout holes 1 are provided.
1A is drilled so as to extend in the radial direction from the oil hole 10. Therefore, a part of the lubricating oil in the main oil tank 9 is sucked up through the oil hole 10 of the rotating shaft 1, and is jetted out in the radial direction toward the steel ball receiving recess 4 from the plurality of oil jet holes 11A, and one of the Part of the oil enters the recess 4 to lubricate the steel ball 5, and the remaining oil lubricates the upper rolling bearing 2A.

Further, according to this embodiment, the lower bearing holder 3B
A plurality of other oil jetting holes 11B are drilled at a level slightly higher than the top surface so as to extend in the radial direction from the oil hole 10. The bearing 2B is also lubricated.

Effects of the Invention As described above, according to the bearing device of the present invention, the rotating shaft of the vertical rotating mechanism is movable in the radial and axial directions, and rotational bending stress generated in the rotating shaft can be reduced. As a result, the fatigue life of the rotating shaft can be significantly extended, and the force acting on the bearing can also be reduced, resulting in the effect of extending the life of the bearing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a bearing device according to the present invention, and FIG. 2 is a sectional view showing a conventional bearing device. 1... Rotating shaft, 2A, 2B... Rolling bearing,
3A, 3B... Bearing holder, 4... Steel ball receiving recess, 5... Steel ball, 6... Steel ball receiving seat, 7A, 7B...
...Damper, 8...Spring, 9...Main oil tank, 1
0...Oil hole, 11A, 11B...Oil spout hole, 12
……casing.

Claims (1)

[Scope of utility model registration request] A rotating shaft extending vertically within the casing of a vertical rotating machine is supported by upper and lower rolling bearings, and a bearing holder is interposed between the radial outer circumference of each rolling bearing and the casing,
A spring is interposed between the lower bearing holder and the bottom of the casing to apply pressure in the axial direction to the rolling bearing. In the bearing device, dampers are interposed between the radial outer circumferential parts of the upper and lower bearing holders and the casing, and steel balls are inserted into the steel ball receiving recesses formed on the upper surface of the upper bearing holder. At the same time,
A steel ball seat for pressing the steel ball from above is provided in the casing, and an oil spout passage is formed inside the rotating shaft for sucking up a portion of the lubricating oil in the main oil tank and spouting it toward the steel ball receiving recess. A bearing device for a vertical rotating machine characterized by: