JPS60196427A - Damping device for rotor - Google Patents

Abstract

PURPOSE:To secure such a rotor damping device as capable of performing stable damping action, by constituting a connecting part between a support member and a slig rod locked to an oil tank and a connecting part between a movable body and the sling rod both with an articulated joint. CONSTITUTION:A support plate 11 is provided with plural circular concave parts 14 in a circumferential direction in its upper surface side, and at each concave part, a through hole 15 is installed in each bottom surface and that a concave spherical seat 16 is also installed. Concave parts 21 are installed in a movable body 13 like in case of the support plate 11 but so as to be reversed in direction. A sling rod 12 is provided with a semispheric engaging body 27 in its both ends, piercing through a hole 15 of the support plate 11 and a hole 17 of the concave spherical seat 16, and rockably supported on the support plate in a state that a convex spherical surface 27a of the semispherical engaging body is made to be fitted in a concave spherical surface 16a of the concave spherical seat. In addition, the movable body is rockably supported by the sling rod with a convex spherical surface 28a of one side semispherical engaging body 28 of the sling rod fitted in a concave spherical surface 23a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a vibration damping device for a rotating body that utilizes the shear resistance of an oil film as a damping force.

[Technical background of the invention and its problems]

Conventionally, as an allocation device for suppressing the vibration of a vertical rotating body,
Various methods have been considered, including one that utilizes the shear resistance of an oil film as a damping force. This liquid film shear type vibration damping device performs damping using the reaction force when a liquid film is forcibly sheared, and is characterized by excellent responsiveness.

Such a conventional vibration damping device for a rotating body is generally constructed as shown in FIG.

That is, numeral 1 in the figure is an oil tank whose upper surface is open and which stores lubricating oil P inside. The oil tank 1 is formed flat with high precision so that the inner surface of the bottom wall thereof becomes the pace surface 2. An annular support plate 3 is fitted into the opening of the oil tank 1 .

Thus, the movable body 4 is housed inside the oil tank 1 in a state submerged in the lubricating oil P. The movable body 4 is formed into a disk shape as a whole, and a suspension system made of a plurality of elastic materials is attached from the support plate 3 so that a small gap Q is formed between the lower surface of the movable body 4 and the base surface 2 in the figure. It is suspended by rod 5. A thrust bearing 7 that supports the lower end of a lower shaft 6 of a vertical rotating body (not shown) is fixed to the center of the upper surface of the movable body 4 in the figure.

This device exhibits a vibration damping function in the following manner. That is, when the vertical rotating body attempts to pass through the critical speed and a whirling force is generated in the vertical rotating body, the vibration of the lower shaft 6 increases, and as a result, the movable body 4 also vibrates in the horizontal direction. try to. In this case, since an oil film is formed within the minute gap Q, the movable body 4
When the oil film vibrates, the oil film is sheared, and the energy consumed during this shearing absorbs the vibration energy and exhibits a vibration damping function.

By the way, in the conventional allocation device configured as described above, the support plate 3, the movable body 4, and the hanging rod 5 are fixed 7 by welding. Therefore, when the rotating body vibrates as described above, the support plate 3, the movable body 4 and the hanging rod 5
Bending stress is generated in the connecting portion with the hanging rod 5 and the hanging rod 5 itself. As a result, when the rotating body is operated for a long period of time, cracks may occur in the connecting portions and the suspension rod 4, and there is a risk of serious damage to the allocation device.

[Purpose of the invention]

The present invention was made in view of such problems, and its purpose is to prevent the occurrence of bending stress in the movable body support means and to provide a rotational vibration damping function that is stable over a long period of time. An object of the present invention is to provide a body vibration damping device.

[Summary of the invention]

The present invention is characterized by the movable body support means.

That is, the movable body support means according to the present invention includes a support member fixed to an oil tank, a plurality of hanging rods for suspending the movable body from the support member, both ends of these hanging rods, the movable body, and the movable body. It is equipped with an articulated joint provided between the support member and the support member.

〔Effect of the invention〕

According to the present invention, the connecting portion between the support member fixed to the oil tank and the hanging rod and the connecting portion between the movable body and the hanging rod are each configured as an articulated joint.

Therefore, even if the movable body moves due to the vibration of the rotating body, the bending stress caused by the displacement of the support member and the hanging rod or the hanging rod and the movable body is absorbed by the sliding of the engagement surfaces in these joints. . Therefore, almost no bending stress is generated in the movable body support means. Therefore, the vibration damping device for a rotating body according to the present invention can maintain a stable allocation function over a long period of time.

[Embodiments of the invention]

Hereinafter, a vibration damping device for a rotating body according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4. Note that in FIG. 2, the same parts as in FIG. 1 are given the same reference numerals and detailed explanations will be omitted.

5. This embodiment differs from the conventional example in that the support plate 11 and the hanging rod 1
2 and the connecting portion between the hanging rod 12 and the movable body 13.

That is, in FIG. 2, the support plate 11 is provided with a plurality of circular recesses 14 in the circumferential direction on the upper surface side in the figure, and holes 15 penetrating from the bottom surface of each of these four parts 14 to the lower surface in the figure. ing. A concave spherical dust 16 is fitted into each of the four parts 14, as shown in FIG. The concave spherical dust 16 has a concave spherical surface 16a on the upper surface in the figure, and extends from the center of the concave spherical surface 16a to the hole 1 of the support plate 11.
It is formed with a conical hole 17 that communicates with the hole 5 .

The movable body 13 is provided with two recesses at circumferential positions corresponding to the recesses 14 on the lower surface side in the figure, and holes 22 penetrating from the bottom surface of each of these recesses 21 to the upper surface in the figure. ing. As shown in FIG. 4, concave spherical dust 23 is fixed in each of the recesses 21 as follows. That is, the concave spherical surface 23 has a concave spherical surface 23a on its lower surface as shown in 6- in the figure, and this concave spherical surface 23
A conical hole 24 is provided which communicates with the hole 22 of the movable body 13 from the center part of the movable body 13, and a flange portion 25 is provided at the edge of the upper surface in the figure. The concave spherical surface portion 23 is fixed to the flange portion 25 and the bottom peripheral edge of the four portions 2 by screws 26.

The hanging rod 12 is made of, for example, a relatively rigid material. Hemispherical engaging bodies 27 and 28 are fixed to both ends of the hanging rod 12 with their respective convex spherical surfaces 27a and 28a facing each other.

The hanging rod 12 passes through the hole 15 of the support plate 11 and the hole 17 of the concave spherical surface part 16, and the convex spherical surface 27a of the hemispherical engaging body 27 is fitted into the concave spherical surface 16a of the concave spherical surface part 16. It is swingably supported by a support plate 1. Furthermore, the movable body 13 allows the hanging rod 12 to pass through the hole 22 of the movable body 13 and the hole 24 of the concave spherical surface portion 23, and
The concave spherical surface 23a of the hemispherical engaging body 28 is fitted into the convex spherical surface 28a of the hemispherical engaging body 28, and is swingably supported by the hanging rod 12. That is, both ends of the hanging rod 12 are connected to the support plate 11 and the movable body 13 via joints.

With this configuration, when a displacement that causes bending stress occurs between the support plate 11 and the hanging rod 12, the hemispherical engagement body 27 rotates on the concave spherical spacer 16, causing the hanging rod 12 to rotate. Prevents bending stress from occurring. Furthermore, when a similar displacement occurs between the suspension rod 12 and the movable body 13, the hemispherical engagement body 2
8 and the concave spherical surface portion 23 rotate relative to each other, thereby preventing bending stress from occurring in the hanging rod 12.

In this way, according to this embodiment, even if vibration occurs in the rotating body and displacement occurs between the oil tank 1 and the movable body 13,
Since the connecting portion between the support plate 1 and the hanging rod 12 and the connecting portion between the hanging rod 12 and the movable body 13 rotate, bending stress is not generated in the hanging rod 12. Therefore, the above-mentioned effects can be obtained. In this case, the support plate 11
The connection between the hanging rod 12 and the hanging rod 12 and the movable body 13 can be made much simpler than in the past.

Note that the present invention is not limited to the above embodiments.

For example, as shown in FIG.
The assembling performance with the hanging rod 12 may be improved.

That is, in this case, the width of the support plate 1 extends from the inner circumference to the center of the four parts 14, and the width is equal to the length of the hanging rod 12.
Create 3 slits slightly wider than the trench, concave spherical part 1
6 is provided with a similar slit 32 extending from its outer periphery to its center. When attaching the hanging rod 12 to the support plate 11, the concave spherical surface portion 16 is rotated so that the slits 31 and 32 overlap. In this state, the hanging rod 12 is inserted into the slits 31 and 32. , set it in place. Thereafter, the concave spherical portion 16 is rotated 1800 revolutions to regulate the position of the hanging rod 12 in the circumferential direction.

Such a configuration has the effect that the support plate 11 and the hanging rod 12 can be assembled more easily.

In addition, in order to increase the automatic return force of the movable body, a permanent magnet may be embedded in the movable body and the oil tank in such a relationship that a magnetic attraction force acts between them.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional vibration damping device for a rotating body that utilizes shearing of a liquid film, FIG. 2 is a vertical cross-sectional view of a vibration damping device for a rotating body according to an embodiment of the present invention, and FIG. 4 is an enlarged view of the main parts of the same apparatus, and FIG. 5 is a plan view showing the main parts of another embodiment of the present invention. l... Oil tank, 2... Base surface, 3, 11... Support plate, 4.13... Movable body, 5, 12... Hanging rod, 6.
・Lower shaft, 7... Thrust bearing, 14.21... Recess, 15.17, 22.24... Hole, 16.23...
- Concave spherical surface part, 16a, 23a... Concave spherical surface, 25... Flange part, 27.28... Hemisphere engaging body, 27a, 28a...
・Convex spherical surface, 31.32...Slit, P...Lubricating oil,
Q...Minute gap. 10- 282'13Q21 --IRd--

Claims (1)

[Claims] an oil tank containing lubricating oil, a pace provided in a stationary state within the oil tank, and a thrust bearing arranged to be immersed in the lubricating oil in the oil tank and supporting a vertical rotating body. A small gap is provided between the movable body, the oil tank, and the movable body, and a minute gap is maintained between the movable body and the pace so as to form an oil film extending only in a direction perpendicular to the axis of the rotary body. A vibration damping device for a rotary body comprising a movable body support means for suspending and supporting the movable body so as to be movable only in the direction in which the oil film extends, the movable body support means comprising: a support member fixed to the oil tank; , a plurality of hanging rods for suspending the movable body from the supporting member, and joints interposed between both ends of these hanging rods and the movable body and the supporting member, respectively. Characteristic vibration damping device for rotating bodies.