CN216867298U - Active control tilting pad bearing - Google Patents

Abstract

The utility model discloses an active control tilting pad bearing, which comprises a shell and a plurality of pads, wherein the shell is of a hollow cylindrical structure, a plurality of mounting grooves are formed in the inner wall of the shell along the circumferential direction of the shell, and the back of each pad is provided with a pad root embedded in the mounting groove and enables the pad to move in the radial direction of an inner cavity of the shell; the outer wall of the shell is provided with a first throttling hole communicated with the mounting groove, so that when a high-pressure lubricating medium introduced from the outside to the first throttling hole is brought into a gap between the shell and the tile block, an outer layer fluid static pressure film capable of supporting the tile block to float in the radial direction of the tile block is formed to control the floating displacement of each tile block in the radial direction of the tile block, and through a second throttling hole and a third throttling hole formed in the outer wall of the shell, the external high-pressure lubricating medium is introduced into the gap between the shell and the tile block to form another outer layer fluid static pressure film, so that the swing angle of the tile block is adjusted, and the tile block has self-adaptive energy-saving force along with the change of load to reduce vibration and eliminate vibration of the rotor, and the effect of active vibration reduction is achieved.

Description

Active control tilting pad bearing

Technical Field

The utility model relates to the technical field of bearings, in particular to an active control tilting pad bearing.

Background

Tilting pad bearings have high rotational speed and stability and are widely used in turbomachinery. However, the existing tilting pad bearing usually adopts a mechanical fulcrum to support the pad, so that the tilting pad bearing is complex to mount and has high fulcrum contact stress and fatigue in a working state, the damping coefficient of the cross rigidity of the bearing can be increased, and unstable factors are brought. Tilting pad bearings using fluid fulcrums instead of traditional mechanical fulcrums have been introduced in the market to eliminate wear of pad mechanical fulcrums. However, the existing tilting pad bearing adopting a fluid fulcrum has an unreasonable structural design, and when a rotor is seriously impacted and a shaft neck thereof is seriously inclined, a pad block cannot be adaptively adjusted in the radial direction of the rotor, so that the pad block contacting with the shaft neck of the rotor is unevenly stressed in the radial direction, the pad block is greatly stressed in the direction of the inclined side of the shaft neck of the rotor, and a pad surface is crushed in serious cases, so that the bearing bush is collided and rubbed, and the equipment stops running.

SUMMERY OF THE UTILITY MODEL

In view of the defects of the prior art, the present invention provides an actively controlled tilting pad bearing, which can make the pad block have adaptive adjustment capability along with the change of load in the radial direction thereof to damp and eliminate vibration of the rotor, so as to achieve the effect of active vibration damping, and increase the damping vibration damping characteristic of the bearing in the radial direction.

The purpose of the utility model is realized by adopting the following technical scheme:

an actively-controlled tilting pad bearing comprises a shell and a plurality of pads, wherein the shell is of a hollow cylindrical structure, a plurality of mounting grooves are formed in the inner wall of the shell along the circumferential direction of the shell, and a pad is arranged at the back of each pad and embedded in the mounting grooves and can move in the radial direction of an inner cavity of the shell; and a first throttling hole communicated with the mounting groove is formed in the outer wall of the shell, so that when a high-pressure lubricating medium introduced from the outside to the first throttling hole is brought into a gap between the shell and the pads, an outer layer fluid static pressure film capable of supporting the pads to float in the radial direction of the pads is formed, and the displacement of each pad floating in the radial direction is controlled.

Furthermore, a first static pressure cavity is formed in the mounting groove and is arranged along the axial direction of the shell.

Further, the shell is provided with a second throttling hole from the outer wall to the inner wall direction, and the second throttling hole is located on the first side of the mounting groove and faces the pad at the inner wall end of the shell.

Further, the housing is provided with a third throttling hole from the outer wall to the inner wall, and the third throttling hole is positioned on the second side of the mounting groove and faces the tile block at the inner wall end of the housing.

Further, a second static pressure cavity is arranged on the inner wall of the shell, and the second static pressure cavity is arranged at the port of the inner wall of the shell corresponding to the second throttling hole.

Further, the second static pressure cavity is circular or rectangular in shape.

Further, the third throttling hole and the second throttling hole are symmetrically arranged by taking the axial direction of the mounting groove as a reference.

Further, a third static pressure cavity is arranged on the inner wall of the shell, and the third static pressure cavity is arranged at the port of the inner wall of the shell corresponding to the third throttling hole.

Further, the third static pressure cavity is circular or rectangular in shape.

Further, the mounting groove is a T-shaped groove, and the tile root is of an inverted T-shaped structure.

Compared with the prior art, the utility model has the beneficial effects that:

according to the tilting pad bearing, the pad roots of the pads are embedded into the mounting groove of the shell, so that the flexible pivot of the tilting pad bearing is in a separated design, and the pads can move in the radial direction of the inner cavity of the shell; based on the above, when the rotor of the tilting pad bearing rotates to bring the introduced high-pressure lubricating medium into the gap between the housing and the pad, an outer layer fluid static pressure film capable of supporting the pad to float in the radial direction can be formed, so that the displacement of each pad floating in the radial direction is controlled, and the pad can have adaptive adjustment force along with the change of load in the radial direction to damp and eliminate vibration of the rotor (the adaptive adjustment force of the pad in the radial direction is adjusted according to the pressure of the high-pressure lubricating medium introduced from the outside), so that the active damping effect is achieved, and the damping vibration attenuation characteristic of the bearing in the radial direction is improved.

Drawings

Fig. 1 is a schematic perspective view of a tilting pad bearing according to the present invention;

FIG. 2 is a schematic structural diagram of a tilting pad bearing according to the present invention;

FIG. 3 is a schematic structural diagram of a housing according to an embodiment of the present invention;

FIG. 4 is a perspective view of a portion of a housing according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a tile in an embodiment of the present invention.

In the figure: 1. a housing; 10. mounting grooves; 100. a first hydrostatic chamber; 11. a first orifice; 12. a second orifice; 120. a second hydrostatic pocket; 13. a third orifice; 130. a third hydrostatic pocket; 2. a tile; 20. root of wampee; 21. an anti-friction layer; 22. a tile back substrate; 3. and a rotor.

Detailed Description

The present invention will be described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the following description, various embodiments or technical features may be arbitrarily combined to form a new embodiment without conflict.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The implementation mode is as follows:

as shown in fig. 1-5, the present invention shows an active control tilting pad bearing, which comprises a housing 1, a rotor 3 and a plurality of pads 2, wherein the housing 1 is a hollow cylindrical structure, the inner wall of the housing 1 is provided with a plurality of mounting grooves 10 along the circumferential direction thereof, the back of each pad 2 is provided with a pad 20, the pad 20 is embedded in the mounting groove 10 and enables the pad 2 to move in the radial direction of the inner cavity of the housing 1, and the pads 2 are annularly and uniformly distributed around the central axis of the housing 1, so that the flexible pivot of the tilting pad bearing forms a separate design, replaces the mechanical pivot of the conventional tilting pad bearing, and ensures that the pad 2 can move in the radial direction of the inner cavity of the housing 1.

Specifically, the mounting groove 10 is a T-shaped groove, and the shoe root 20 is an inverted T-shaped structure, that is, the flexible pivot of the pad 2 of the tilting pad bearing of the present invention is designed to be an inverted T-shaped structure, and is embedded into the T-shaped groove of the housing 1, and there is a certain gap between the flexible pivot of the inverted T-shaped structure and the T-shaped groove of the housing 1, so that the pad 2 can move radially in the inner cavity of the housing 1, but is limited within a certain range. Of course, the rotor is arranged within the annular structure formed by the pads 2; the housing 1 may be an integral structure or a split structure, and the housing 1 of this embodiment is a split structure, that is, a hollow cylindrical structure formed by connecting two semicircular housings 1. In addition, the tilting pad bearing can be divided into a multi-pad tilting pad bearing such as three-pad, four-pad or five-pad tilting pad bearing.

On the basis of the above structure, the outer wall of the shell 1 is provided with a first orifice 11 communicated with the mounting groove 10, that is, the shell 1 is provided with the first orifice 11 from the outer wall to the inner wall direction, and the first orifice 11 is communicated with the mounting groove 10, so that when a high-pressure lubricating medium introduced from the outside to the first orifice 11 is brought into the gap between the shell 1 and the pads 2, an outer layer fluid static pressure film capable of supporting the pads 2 to float in the radial direction is formed, and the displacement of each pad 2 floating in the radial direction is controlled. That is, it can be understood that the high-pressure lubrication medium of the external high-pressure lubrication system enters the gap between the shell 1 and the pad 2 through the first orifice 11 to form a hydrostatic fulcrum, which is an outer hydrostatic film, and the outer hydrostatic film is a first outer hydrostatic film. When the rotor is used, under the condition that the rotor is seriously impacted, and the shaft neck of the rotor is seriously inclined, the pressure of the first outer layer fluid static pressure membrane is adjusted to control the pad 2 to have self-adaptive energy-saving force along with the change of the load in the radial direction so as to damp and eliminate vibration of the rotor (the pressure and the flow of a high-pressure lubricating medium can be adjusted and controlled according to the external load), so that the active vibration damping effect is achieved, the damping vibration damping characteristic of the bearing in the radial direction is improved, and the fault that the pad 2 is in collision and abrasion with the shaft neck of the rotor is avoided.

Therefore, the hydrostatic pressure active control flexible support bearing adopts a composite support form of a hydrostatic fulcrum and a flexible fulcrum which are forcibly floated by an external high-pressure fluid lubricating medium, and the pressure and the flow of the high-pressure fluid lubricating medium can be adjusted and controlled according to external loads, so that the effect of avoiding collision and abrasion faults between the pad 2 and a shaft neck of a rotor is achieved.

It should be noted that, since the rotor is statically supported on the pad 2 in the initial state, when the rotor starts to rotate, the lubricating medium is brought to the wedge-shaped gap between the rotor and the pad 2, so as to form an inner layer dynamic pressure lubricating film floating the rotor, and at the same time, the external high pressure lubricating system is started, and the lubricating medium such as high pressure lubricating oil, gas and water is forced to be brought into the gap between the housing 1 and the pad 2 through the first throttle hole 11 of the housing 1 by a high pressure pump or a hydraulic control valve, so as to form a first outer layer hydrostatic film supporting the pad 2 to float, i.e. a hydrostatic fulcrum. Of course, in order to constantly and stably support the pad 2 to float at a certain height, the high-pressure lubricating medium (gas, oil, water, etc.) continuously enters the gap between the housing 1 and the pad 2 from the first orifice 11 and continuously flows out from the gap between the pad 2 and the two ends of the housing 1, and the flowing-in and flowing-out are subject to the balance principle of the flow rate of the lubricating medium.

It is worth mentioning that the tile 2 has the anti-friction layer 21 and the tile back base 22, the tile root 20 is arranged on the tile back base 22, and the anti-friction layer 21 is fixedly arranged on the end face of the tile back base 22 opposite to the rotor, so that a fluid lubricating film can be formed better. Of course, the pad 2 has a certain preload coefficient, and when the lubricating medium is oil, the antifriction layer 21 of the pad 2 is a babbitt layer; when the lubricating medium is gas, the antifriction layer 21 of the tile 2 is an aluminum tin alloy layer or other wear-resistant material layer; when the lubricating medium is water, the antifriction layer 21 of the shoe 2 is a carbon graphite layer, and therefore, the inventors can change the material of the antifriction layer 21 of the shoe 2 according to the actual use, and therefore the present invention is not limited thereto.

As a preferred embodiment of the present invention, the present invention may also have the following additional technical features: a first static pressure chamber 100 is opened on the mounting groove 10, and the first static pressure chamber 100 is arranged along the axial direction of the housing 1. That is, it can be understood that the lubricating medium introduced into the gap between the housing 1 and the shoe 2 through the first orifice 11 is accumulated in the first hydrostatic pocket 100 so as to form the first outer hydrostatic film described above. Of course, the inventors may change the number of the first throttle holes 11 and the first hydrostatic pockets 100 according to the actual usage, and therefore, the utility model is not limited thereto.

In this embodiment, the housing 1 has a second orifice 12 formed from the outer wall toward the inner wall, and the second orifice 12 is located on the first side of the mounting groove 10 and faces the pad 2 at the inner wall end of the housing 1. That is, it can be understood that the introduction of the high-pressure lubricating medium into the second restriction hole 12 from the outside can adjust the swing angle of the pads 2, and thus the effect of adjusting the relative positions of the annular spaces formed by the pads 2 and the central axis of the housing 1 can be achieved. Therefore, as can be understood by those skilled in the art, when the journal of the rotor is subjected to severe working conditions such as inclined swinging and the like, the pressure of the dynamic pressure lubricating film of the inner layer can be changed by adjusting the swinging angle of the shoe, and better inner layer rigidity and damping can be obtained, so that the aim of vibration reduction of the rotor is fulfilled, and the effect of active vibration reduction is further achieved. In addition, in order to be able to accumulate the high-pressure lubricating medium introduced from the outside, the second static pressure chamber 120 is provided on the inner wall of the housing 1, and the second static pressure chamber 120 is provided at the inner wall port of the housing 1 corresponding to the second orifice 12. The second static pressure cavity 120 is mainly used for accumulating and introducing external high-pressure lubricating media to control the swing angle of the pad 2, the swing angle of the pad 2 can be changed by adjusting the pressure of the second static pressure cavity 120, and the effect of actively controlling the tilting pad bearing to actively damp vibration is further achieved.

In this embodiment, the housing 1 is provided with a third throttling hole 13 from the outer wall to the inner wall, and the third throttling hole 13 is located at the second side of the mounting groove 10 and faces the pad 2 at the inner wall end of the housing 1. It will be appreciated that the introduction of high pressure lubricating medium from the outside into the third orifice 13 adjusts the angle of oscillation of the pads 2, which further has the effect of adjusting the relative position of the annular space formed by the pads 2 with respect to the central axis of the housing 1. So far, as can be understood by those skilled in the art, when the journal of the rotor is inclined, the purpose of damping and eliminating vibration of the rotor can be further achieved by adjusting the swing angle of the pad 2, and further the effect of active vibration reduction is achieved. In addition, in order to be able to accumulate the high-pressure lubricating medium introduced from the outside, a third static pressure chamber 130 is provided on the inner wall of the housing 1, and the third static pressure chamber 130 is provided at the inner wall port of the housing 1 corresponding to the third orifice 13. The third static pressure cavity 130 is mainly used for accumulating and introducing an external high-pressure lubricating medium to control the swing angle of the pad 2, the swing angle of the pad 2 can be changed by adjusting the pressure of the third static pressure cavity 130, and further the effect of actively controlling the tilting pad bearing to actively damp vibration is achieved. Therefore, the active control effect of the flexible support tilting pad 2 is achieved by adjusting the pressure of the static pressure cavities at the left end and the right end of the flexible fulcrum.

It is worth explaining that through the second and third throttling holes formed in the outer wall of the shell, an external high-pressure lubricating medium is introduced into a gap between the shell and the tile, and an outer layer fluid static pressure film is formed, wherein the outer layer fluid static pressure film is the second outer layer fluid static pressure film, so that the swing angle of the tile is adjusted, the tile can have self-adaptive capacity along with the change of load in the swing direction, the active vibration reduction effect is further achieved, and the damping vibration reduction characteristic of the bearing in the radial direction is improved.

In this embodiment, the third orifice 13 and the second orifice 12 are symmetrically disposed with respect to the axial direction of the mounting groove 10, so that the swing angle of the pad 2 can be uniformly adjusted by the hydrostatic pressure formed at the left and right ends of the flexible fulcrum. In addition, the shapes of the second static pressure cavity 120 and the third static pressure cavity 130 are both circular or rectangular, in this embodiment, the second static pressure cavity 120 and the third static pressure cavity 130 are both rectangular, the second orifice 12 is located at the center of the second static pressure cavity 120 at the inner wall port of the housing 1, and the third orifice 13 is located at the center of the third static pressure cavity 130 at the inner wall port of the housing 1, so that the high-pressure lubricating medium at the left end and the right end of the flexible fulcrum can uniformly adjust the swing angle of the pad 2. Of course, in other embodiments, the shape of the second hydrostatic pressure chamber 120 and the third hydrostatic pressure chamber 130 may be modified by the inventor according to the actual use condition, and thus, the shape of the second hydrostatic pressure chamber and the third hydrostatic pressure chamber 130 is not limited to the structure shown in the following drawings.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (10)

1. An active control tilting pad bearing comprises a shell (1) and a plurality of pads (2), wherein the shell (1) is of a hollow cylindrical structure, a plurality of mounting grooves (10) are formed in the inner wall of the shell (1) along the circumferential direction of the shell, a pad root (20) is arranged at the back of each pad (2), and the pad root (20) is embedded in the mounting grooves (10) and enables the pads (2) to move in the radial direction of an inner cavity of the shell (1); the method is characterized in that: the outer wall of the shell (1) is provided with a first throttling hole (11) communicated with the mounting groove (10), so that when a high-pressure lubricating medium introduced from the outside to the first throttling hole (11) is brought into a gap between the shell (1) and the pads (2), an outer layer fluid static pressure film capable of supporting the pads (2) to float in the radial direction of the pads is formed, and the displacement of each pad (2) floating in the radial direction of the pad is controlled.

2. An actively controlled tilting pad bearing according to claim 1 wherein: a first static pressure cavity (100) is formed in the mounting groove (10), and the first static pressure cavity (100) is arranged along the axial direction of the shell (1).

3. An actively controlled tilting pad bearing according to claim 1 wherein: the shell (1) is provided with a second throttling hole (12) from the outer wall to the inner wall direction, and the second throttling hole (12) is positioned on the first side of the mounting groove (10) and faces the pad (2) at the inner wall end of the shell (1).

4. An actively controlled tilting pad bearing according to claim 3 wherein: the shell (1) is provided with a third throttling hole (13) from the outer wall to the inner wall direction, and the third throttling hole (13) is located on the second side of the mounting groove (10) and faces the tile block (2) at the inner wall end of the shell (1).

5. An actively controlled tilting pad bearing according to claim 3 wherein: and a second static pressure cavity (120) is arranged on the inner wall of the shell (1), and the second static pressure cavity (120) is arranged at the port of the inner wall of the shell (1) corresponding to the second throttling hole (12).

6. An actively controlled tilting pad bearing according to claim 5 wherein: the second static pressure cavity (120) is circular or rectangular in shape.

7. An actively controlled tilting pad bearing according to claim 4 wherein: and the third throttling hole (13) and the second throttling hole (12) are symmetrically arranged by taking the axial direction of the mounting groove (10) as a reference.

8. An actively controlled tilting pad bearing according to claim 4 wherein: a third static pressure cavity (130) is arranged on the inner wall of the shell (1), and the third static pressure cavity (130) is arranged on the port of the inner wall of the shell (1) corresponding to the third throttling hole (13).

9. An actively controlled tilting pad bearing according to claim 8 wherein: the third static pressure cavity (130) is circular or rectangular in shape.

10. An actively controlled tilting pad bearing according to claim 1 wherein: the mounting groove (10) is a T-shaped groove, and the tile root (20) is of an inverted T-shaped structure.

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