JPS60241515A - Thrust bearing device - Google Patents

Abstract

PURPOSE:To restrain an impact force of a thrust shoe in a thrust bearing by providing an elastic support for damping the impact force caused by the thrust shoe colliding with a support body through rotary frictional force. CONSTITUTION:Thrust shoes 1 are segmental and mounted on a bearing bed 2 through a plurality of springs 3. Support bodies 4 are provided on portions opposed to the thrust shoes 1 with plate-like elastic support portions 6. Thus, since the elastic support portions 6 elastically deformed by peak frictional force in starting are provided, a impact force given to the support body 4 by the damping action of these elastic support portions 6 is restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a thrust bearing device that slidingly supports a rotating body that rotates reversibly, and particularly to a thrust bearing device that elastically supports an impact force at the time of startup.

[Technical background of the invention and its highlights] Rotating machines such as water turbines (including pump water turbines) and water turbine generators (including motor generators) are equipped with thrust bearings.

The thrust bearings of these large rotating machines generally have island-shaped thrust shoes arranged in an annular shape, on which the rotating body slides.

Each thrust shoe is mounted on a bearing stand via a support member or the like at a support portion tI- so that various deformations and inclinations during operation are not restricted. Deformations of the thrust shoe include concave deformation of the sliding surface that occurs when stopped or rotating at low speed (with Ni-thrust carts), and convex deformation of the sliding movement that occurs due to frictional heat during operation.

In addition, there is an inclination in the circumferential direction due to the wedge-shaped oil bridge formed between the rotating body and the rotating body.

Due to the IHi between the thrust shoe and the support body, a small gap is appropriately provided so as not to restrict their movements.-1 The thrust shoe is allowed to move freely within the range of this small gap.

By the way, for example, a pump-turbine for pumping water generation or 1! which is equipped with a thrust bearing of the above-mentioned configuration and performs reversible rotation operation. In power generators, etc., as the reversible operation is repeated, the circumferential rain contact surface of the thrust shoe and support body receives the impact force of the thrust shoe every time it is started, resulting in erosion and small gaps. It is expanding abnormally.

When this small gap is enlarged, the impact force becomes larger and may damage the mounting member that fixes the support to the bearing stand.
There is also the problem that abnormal noises are generated when starting up.

[Object of the Invention] An object of the present invention is to provide a thrust bearing device for reversible rotation that allows the thrust shoe to swing and suppresses the impact force of the thrust shoe that occurs during startup.

[Summary of the Invention 9] In order to achieve the above object, the thrust bearing device of the present invention includes a split-type thrust shoe that supports a rotating body that rotates reversibly, and a bearing metal ( = The thrust shoe is provided with a supporting body that supports the thrust shoe, and in order to allow the thrust shoe to swing freely, the thrust shoe is rotated and shaken at least in the circumferential direction (with a predetermined small gap between the thrust shoe and the support body). Embodiments of the Invention] Examples of the present invention will be described below with reference to the drawings.

Embodiment 1 FIGS. 1 and 2 show a general spring support type thrust bearing device, in which 1 is a thrust shoe. This thrust shoe 1 has a fan shape and is placed on a bearing stand 2 via a plurality of springs 3.

These thrust shoes 1 are attached to a circumferential weight wedge-shaped support 4.
The rotating body 10 is slidably arranged through the rotating body 10 in an annular manner. Support 4 is a dowel pin or bolt (not illustrated)
It is fixed to the bearing stand 2 by a fixing member 5 such as the like.

There is a small gap (0
, 1-0.2m) gl, g9 are provided. This small gap is provided to allow the aforementioned thrust shoe 1 to freely thermally deform and swing during operation.

The support body 4 is provided with a plate-shaped elastic support portion 6 having a thickness t and a height h, as shown in FIG. 2, at a portion facing the thrust shoe 1. The elastic supporting portion 6 is elastically deformed in response to the peak M vibration force when the rotating body 10 is started, and is prevented from deforming when the rotational speed increases and the repulsive force decreases.
2. Set each as appropriate.

Next, the effect will be explained. In FIG. 2, if the rotating body 10 is first rotated in the clockwise direction indicated by the arrow a, the thrust shoes 1 move toward the rotation direction, that is, to the left, and are in close contact with each other by a small gap g at the time of startup. Next, when the rotating body IO is rotated in the counterclockwise direction indicated by the arrow, the thrust shoe 1 moves by the gap (g + gB) on both sides, and the support 4
collide with Therefore, since this support body 4 is provided with an elastic support part 6 that elastically deforms against the peak frictional force at the time of startup, the @electric power received by the support body 4 is suppressed by the buffering action of this elastic support part 6, resulting in reversible operation. Even if this is done frequently, the mounting members 5 such as bottles and bolts (not shown) will not be damaged, and erosion of the contact surfaces can be prevented.

Furthermore, since there is no possibility of miners in the gaps, there will be no abnormal noises.

Embodiment 2 FIG. 3 corresponds to FIG. 2 of Embodiment 1, and this Embodiment 2 has a plate-shaped elastic support portion 6 on the side surface of the thrust shoe 1.
It has been established. Even if this is done, the above-mentioned Example 1
It is possible to obtain the same effect as in Example 3, but when integrating the thrust shoe 1 and the elastic support part 6, care must be taken to select a material with an elastic limit such as mild steel.Example 3 Fig. 4 1 shows a thrust bearing device of a pivot support type, in which a cylindrical support 7 is fixed to the lower surface of a thrust shoe 1 that supports a rotating body consisting of a thrust runner that rotates reversibly as shown by arrows a and b. The support 7 is swingably supported on the bearing stand 2 via a pivot 8.

The friction force applied to the thrust shoe 1 is caused by the force between the limiting plate 9 and the support l
] It is supported by a bearing stand 2 via a support body A that has a zigzag structure.

A hole 9a is provided between the thrust shoe 1 and the bearing stand 2, which has an annular shape surrounding a rotating shaft (not shown), and which passes freely through the support 7. This hole 9a
Its diameter is determined so as to have a predetermined small gap g between it and the support support 7.

A plurality of restriction plates 9 are provided in the widthwise direction, placed on a round rod support 11 fixed to the bearing stand 2 by welding or the like, and firmly fixed by fixing members 5 such as bolts and knock pins.

A thin-necked elastic support portion 6 having a diameter d and a height h is provided on each support column IJ.

As explained in d and hFi Example 1 of this elastic support part 6, when it receives the peak frictional force at the time of starting, it deforms elastically,
Set the stiffness so that it recovers after passing the peak.

In addition, if the 11 supporting columns can be attached and the rigidity can be set to the desired rigidity as described above, a simple shape with a uniform cross section can be used.

In this way, the thrust shoe 1 can freely swing during operation, and even if the support 7 moves by a small gap (2xg) together with the thrust shoe 1 and collides with the restriction plate 9 at the start of each reversible rotation. The support column 1.1 exerts an appropriate buffering effect and does not cause damage to any one member.

In addition, although the above-mentioned valley embodiment is described as providing the elastic support part 6 in a part of the support body 4, the present invention is not limited to this, and the thrust shoe 1 can have the same function as the elastic support part 6. Of course, it may be supported on the support body 4 via a spring material.

[Effects of the Invention] As detailed above, the present invention can provide a thrust bearing device for reversible rotation that maintains sliding performance and can prevent damage to members due to impact force that occurs during startup. .

[Brief explanation of the drawing]

Fig. 1 is a plan view of a thrust bearing showing Embodiment 1 of the present invention, Fig. 2 is a front view taken along the low ■ line in Fig. 1 in the direction of the arrow, and Fig. 3 shows Embodiment 2 of the present invention. A front view of the thrust bearing, FIG. 4 is a front view of the thrust bearing showing the same <Embodiment 3. 1... Thrust 7 U 2... Bearing stand 4... Support body 6... Elastic support part 10... Rotating body agent Patent attorney Noriyuki Chika 0't or 1 person) No. 1
Figure ♂ Figure 2

Claims (1)

[Claims] 1) A split-type thrust shoe that supports a rotating body that rotates reversibly, and Mt in the rotational direction that is applied to this thrust shoe.
In a thrust bearing device, a thrust bearing device is provided with a support body that supports friction force on a bearing stand, and a predetermined small gap is provided at least in the circumferential direction between the thrust shoe and the support body to allow free rocking of the thrust shoe. A thrust bearing device characterized in that the shoe is provided with an elastic support portion that buffers the impact force that collides with the support body due to rotational friction force. 2) The thrust bearing device yt, 0 according to claim 1, wherein the elastic support portion is provided on the support body.