JPH02292514A - Slide bearing device - Google Patents

Abstract

PURPOSE:To get rid of the occurrence of a friction whip and vibration by providing movably in a rotary direction at the inner perimeter surface of a bearing slide portions buttable against the shaft slide surface of a rotary shaft, and preventing the occurrence of the force of torque by means of the movement of the slide portions. CONSTITUTION:A bearing 11 idly puts on a rotary shaft 12, and a plurality of slide pieces 13 are arranged at its inner perimeter surface. These slide pieces 13 are retained in such a way that they are able to move reciprocally between fixed distances along the inner perimeter surface of the bearing 11. The inside surface of a slide piece 13 is made to be a circular arc bearing slide surface 15. As the rotary shaft 12 rotates, a shaft center A makes a circle movement which makes a clearance l its diameter, and the contact point C of an imbalanced weight 16 and a slide portion (a slide piece) 13 moves in a rotary direction and the occurrence of the force of torque is prevented, so the occurrence of a friction whip and vibration are deterred.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sliding bearing used in a submersible bearing such as a vertical shaft pump.

BACKGROUND OF THE INVENTION Conventionally, submerged bearings for vertical shaft pumps have been lubricated by self-pumped water. These bearings function without lubrication for a short time until self-pumped water reaches the bearings when the pump is started.

Problems to be Solved by the Invention However, in the conventional configuration described above, is it possible to operate a bearing lubricated by self-pumped water for a long time without lubrication? This causes problems such as an increase in the temperature of the bearing and vibration of the main shaft. In addition, since general non-lubricated bearings are designed for low circumferential speeds and high surface pressures, when used as bearings used at relatively high circumferential speeds and low surface pressures, such as in vertical shaft pumps, friction whip There was a problem with vibration.

The principle by which this vibration occurs will be explained based on FIGS. 4 to 6. In FIG. 4, the rotating shaft 1 is rotating in a counterclockwise direction. During normal operation, the shaft sliding surface 2 of the rotating shaft 1 slides into contact with the bearing sliding surface 4 of the sliding bearing 3, and the friction state between the shaft sliding surface 2 and the bearing sliding surface 4 becomes dynamic friction. , the reaction force that the rotating shaft 1 receives from the bearing sliding surface 4 in the direction opposite to the rotational direction becomes small. Therefore, the fifth
As shown in the figure, during normal operation, the position of the unbalanced weight α moves from B1 to B2, and the position of the axis of the rotating shaft 1 is A.
Move from ■ to A2. The movement of the axis of this rotating shaft 1 is
Bearing clearance in the same direction as the rotating direction of rotating shaft 1! It is a circular motion with a diameter of .

Then, when Frixi Sweet Whip occurs, the rotating shaft 1
The shaft sliding surface 2 rolls into contact with the bearing sliding surface 4, and the friction state between the shaft sliding surface 2 and the bearing sliding surface 4 becomes static friction.
The reaction force that the rotating shaft 1 receives from the bearing sliding surface 4 in the direction opposite to the rotational direction increases.

Therefore, as shown in FIG. 6, when friction whip occurs, the position of the unbalanced weight α moves from B1 to B3, and the position of the axis of the rotating shaft 1 moves from A1 to A3. This movement of the axis of the rotary shaft 1 is a circular motion in the clockwise direction Y, which is opposite to the rotational direction of the rotary shaft 1, with the bearing gap being the diameter, and a torsional force acts on the rotary shaft 1. However, in this state, it is impossible for the rotating shaft 1 to remain in continuous contact with the bearing sliding surface 4, and in order to release the torsional force generated on the rotating shaft 1, the rotating shaft 1 must be rotated during one rotation. It separates from the bearing sliding surface 4 several times. In this way,
When the frixian whip occurs, the shaft sliding member 2 of the rotating shaft 1 and the bearing sliding surface 4 of the sliding bearing 3 are not always in contact with each other, and the rotating shaft 1 vibrates.

The reason why the torsional force acts on the rotating shaft 1 is that the contact point C3 between the shaft sliding surface 2 and the bearing sliding surface 4 is A, as shown in FIG.
This is because the contact point C2 is not located on the line A2-B3 as shown in FIG. 5, and no twisting force is generated on the rotating shaft 1. Therefore, even when the shaft sliding surface 2 of the rotating shaft 1 rolls into contact with the bearing sliding surface 4 of the sliding bearing 3, the contact point C is at the position A of the axis of the rotating shaft 1.
If it is located on the line connecting the position B of the unbalanced weight α and the unbalanced weight α, normal operation will be achieved.

The present invention solves the above problems, and even when the shaft sliding surface of the rotating shaft rolls into contact with the bearing sliding surface of the plain bearing, the contact point between the shaft sliding surface and the bearing sliding surface is It is an object of the present invention to provide a sliding bearing device that can be positioned on a line connecting the position of the axis of a rotating shaft and the position of unbalanced weight.

Means for Solving the Problems In order to solve the above problems, the present invention provides a sliding bearing that can come into contact with the sliding surface of the rotating shaft, on the inner circumferential surface of the bearing that is loosely fitted onto the rotating shaft. A sliding portion having a surface is provided so as to be movable in the rotational direction of the rotating shaft.

Effect With the above-described configuration, the sliding portion moves together with the rotating shaft in the rotational direction of the rotating shaft due to the frictional force generated between the shaft sliding surface of the rotating rotating shaft and the bearing sliding surface of the sliding portion. Therefore, the contact point between the rotating shaft and the sliding part moves in the direction of rotation of the rotating shaft in synchronization with the rotation of the rotating shaft, preventing the generation of torsional force on the rotating shaft and preventing the generation of frixicon whip and vibration. be done.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, a bearing I1 is loosely fitted onto a rotating shaft 12, and a plurality of sliding pieces 13 are arranged on the inner peripheral surface of the bearing 11 at appropriate intervals in the circumferential direction. The sliding piece I3 is held by the bearing I1 so as to be able to reciprocate over a certain distance along the inner circumferential surface of the bearing If, and is held on the rotating shaft I2.
The shaft sliding surface! The inner surface of the sliding piece I3, which faces the bearing sliding surface 15, has an arcuate shape. Further, the bearing II has a built-in biasing means (not shown) such as a spring that presses the sliding piece 13 in a direction opposite to the rotational direction Z of the rotating shaft l2. Further, l6 indicates the unbalanced weight of the rotating shaft l2.

Hereinafter, the effects of the above configuration will be explained.

When the rotating shaft l2 rotates while slidingly contacting each sliding piece 13,
The axis A of the rotating shaft 12 is located between the shaft sliding surface l4 and the bearing sliding surface 15.
Perform a circular motion with the gap 1 as the diameter. At this time, the sliding portion l3 rotates together with the rotating shaft 12 due to the frictional force generated between the shaft sliding surface l4 of the rotating rotating shaft l2 and the bearing sliding surface 15 of the sliding portion l3. Move in direction 2. Then, each sliding piece 13 is moved to its initial position by the pressing force of the urging means (not shown) when the contact point C between the shaft sliding surface 14 and the bearing sliding surface l5 is transferred to the adjacent sliding piece 13. will be returned to. Therefore, the contact point C between the rotating shaft I2 and the sliding part 13 is
It moves in the rotation direction of the rotary shaft 12 in synchronization with the rotation of the rotary shaft I2, that is, while being located on the line connecting the axis A of the rotary shaft 12 and the position B of the unbalanced weight 18, and the torsional force on the rotary shaft I2 is generated. This prevents the occurrence of Flixiron whip and vibration.

FIG. 2 shows another embodiment of the present invention, and members having the same functions as those in the previous embodiment are given the same reference numerals and explanations thereof will be omitted. In FIG. 2, inside the bearing 11, an annular movable ring 2l is provided as a sliding piece so as to be rotatable around the axis of the bearing 1l. The movable ring 2I is loosely fitted onto the rotating shaft 12, and has an inner circumferential surface formed as a bearing sliding surface 22.

According to this configuration, as the movable ring 2l rotates, the contact point C between the shaft sliding surface l4 of the rotating shaft l2 and the bearing sliding surface 22 of the movable ring 2l is connected to the axis A of the rotating shaft l2 and the unbalanced weight l6. It moves in the rotational direction of the rotating shaft 12 while being located on the line connecting the position B of . This prevents the generation of torsional force on the rotating shaft 12, as in the previous embodiment, and prevents the generation of friction whip and vibration.

FIG. 3 shows still another embodiment of the present invention, in which a plurality of cylindrical bodies 3 are provided as sliding pieces on the inner peripheral surface of the bearing 11.
1 are arranged at appropriate intervals along the circumferential direction of the inner circumferential surface of the bearing 11, and each cylindrical body 3l is rotatable around an axis parallel to the axis of the rotation axis l2. is maintained. The circumferential surface of the cylindrical body 31 is the bearing sliding surface 3.
It is formed in 2.

According to this configuration, when the cylindrical body 31 rotates,
The shaft sliding surface 14 of the rotating shaft I2 and the bearing sliding surface 3 of the cylindrical body 31
The contact point C with the rotary shaft 12 moves in the rotational direction of the rotary shaft 12 while being located on the line connecting the axis A of the rotary shaft 12 and the position B of the unbalanced weight l6. This prevents the generation of torsional force on the rotating shaft 12, as in the previous embodiment, and prevents the generation of friction whip and vibration.

Effects of the Invention As described above, according to the present invention, the point of contact between the sliding part and the rotating shaft moves in the rotational direction of the rotating shaft, thereby preventing the generation of torsional force on the rotating shaft, thereby improving the flexibility of the Flixiron whip and the rotating shaft. It is possible to prevent vibration from occurring.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIG. 2 is an overall configuration diagram showing another embodiment of the invention, and FIG. 3 is an overall configuration diagram showing still another embodiment of the invention. , Figures 4 to 6
Each figure is an action diagram showing the operation of a conventional sliding bearing. DESCRIPTION OF SYMBOLS 11... Bearing, 12... Rotating shaft, 13... Sliding piece, 14... Shaft sliding surface, 15, 22. 32... Bearing sliding surface, 21... Movable ring, 31... Cylindrical body.

Claims (1)

[Claims] 1. A sliding part that has a bearing sliding surface that can come into contact with the shaft sliding surface of the rotating shaft is movable in the rotational direction of the rotating shaft on the inner peripheral surface of the bearing that is loosely fitted to the rotating shaft. A sliding bearing device characterized in that it is provided in.