Tilting pad bearing

Abstract

The utility model provides a tilting pad bearing which comprises a bearing body, a tilting pad and a cushion block, the tilting pad is arranged in the bearing body, the cushion block is arranged between the tilting pad and the bearing body, a concave hole is formed in the middle of the outer side wall of the cushion block, a damping part is arranged in the concave hole, and the damping part is arranged in the bearing body. The bearing body is provided with an adjusting through hole corresponding to the concave hole, a fastening piece is arranged in the adjusting through hole, and the end, close to the tilting pad, of the fastening piece can be inserted into the concave hole and abuts against the vibration reduction piece in a pressing mode. The damping ratio of the bearing can be increased by arranging the damping part, so that the amplitude of the bearing is reduced, a good damping effect is achieved, and the stability and safety of unit operation can be improved.

Description

Technical Field

[0001] This application belongs to the field of sliding bearing technology, specifically relating to a tilting pad bearing. Background Technology

[0002] Tilting pad bearings are a type of sliding bearing that swings along the bearing shaft. They typically consist of 3 to 5 or more arc-shaped pads that can tilt freely at the fulcrum, hence the name "live support multi-pad bearing". Because the pads can swing freely with changes in rotational speed, load, and bearing temperature, multiple oil wedges are formed around the journal, and the oil film pressure always points towards the center, resulting in high stability and low power consumption. They are widely used in the field of centrifugal compressors.

[0003] During the operation of a centrifugal compressor, when the rotor speed exceeds the critical speed, the rotor amplitude becomes too large. However, the existing tilting pad bearings have relatively small damping, resulting in poor rotor amplitude reduction and thus posing a significant safety hazard to the centrifugal compressor. Utility Model Content

[0004] Therefore, the technical problem to be solved by this application is to provide a tilting pad bearing that can increase the bearing damping ratio by setting vibration damping components, so as to improve the vibration of centrifugal compressors.

[0005] To address the aforementioned problems, this application provides a tilting pad bearing, comprising a bearing body, tilting pads, and a pad. The tilting pads are disposed within the bearing body, and the pad is disposed between the tilting pads and the bearing body. A recess is formed in the middle of the outer side wall of the pad, and a vibration damping element is disposed within the recess. An adjustment through hole corresponding to the recess is formed on the bearing body, and a locking element is disposed within the adjustment through hole. One end of the locking element near the tilting pad can be inserted into the recess and pressed against the vibration damping element.

[0006] Optionally, a groove is provided on the outer wall of the tiltable tile, and at least part of the pad is disposed in the groove.

[0007] Optionally, the outer wall surface of the pad near the bearing body is arc-shaped.

[0008] Optionally, the pad has a retaining edge on the side near the bearing body, the retaining edge being used to limit the pad in the radial direction of the bearing body toward the tilting pad.

[0009] Optionally, the fastening element includes a screwing section having an external thread, and the adjusting through hole having an internal thread. The adjusting through hole and the screwing section are connected by the internal thread and the external thread.

[0010] Optionally, the fastening member further includes a limiting section, which is disposed on the side of the screwing section near the tilting tile, and the end of the limiting section near the tilting tile is movably disposed in the recess.

[0011] Optionally, a plurality of tilting pads are provided, and the plurality of tilting pads are evenly arranged along the circumferential direction of the bearing body.

[0012] Optionally, the bearing body includes a first housing and a second housing, the first housing and the second housing being semi-circular arc-shaped, and the bearing body being formed by connecting the first housing and the second housing together.

[0013] Optionally, the vibration damper is made of nitrile rubber.

[0014] Optionally, the tilting pad bearing further includes oil retaining rings, and two oil retaining rings are provided, which are respectively provided at both ends of the bearing body along the axial direction of the bearing body.

[0015] Beneficial effects

[0016] The tilting pad bearing provided in the embodiments of this utility model can increase the damping ratio of the bearing by setting vibration damping components, thereby reducing the amplitude of the bearing and having a good vibration reduction effect, which can improve the stability and safety of unit operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the tilting pad bearing according to an embodiment of this application;

[0018] Figure 2 for Figure 1 A magnified view of the location of the central vibration damper;

[0019] Figure 3 This is a schematic diagram of the structure of the pad block according to an embodiment of this application.

[0020] The reference numerals in the attached figures are as follows:

[0021] 1. Bearing body; 11. Adjustment through hole; 2. Tilting pad; 21. Groove; 3. Pad; 31. Concave hole; 32. Edge retainer; 4. Vibration damping component; 5. Fastening component. Detailed Implementation

[0022] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] See also Figures 1 to 3 As shown, according to an embodiment of this application, a tilting pad bearing is provided, including a bearing body 1, a tilting pad 2, and a pad 3. The tilting pad 2 is disposed inside the bearing body 1, and the pad 3 is disposed between the tilting pad 2 and the bearing body 1. A recessed hole 31 is provided in the middle of the outer side wall of the pad 3, and a damping member 4 is disposed in the recessed hole 31. An adjustment through hole 11 corresponding to the recessed hole 31 is provided on the bearing body 1, and a fastening member 5 is disposed in the adjustment through hole 11. One end of the fastening member 5 near the tilting pad 2 can be inserted into the recessed hole 31 and pressed against the damping member 4.

[0027] The tilting pad bearing provided in the embodiments of this utility model can increase the damping ratio of the bearing by setting the vibration damping element 4, so as to reduce the amplitude of the bearing and have a good vibration reduction effect, thereby improving the stability and safety of the unit operation.

[0028] The unit can be a centrifugal compressor, meaning that tilting pad bearings can be used in centrifugal compressors.

[0029] The unit includes a rotor, and a bearing body 1 is sleeved on the rotor. The bearing body 1 is the rotor's bushing and is used to support the rotor.

[0030] Specifically, the bearing body 1 is roughly cylindrical. The bearing body 1 can determine the radial position of the rotor and provide radial support to the rotor during the rotor rotation, bear the radial load, support the rotor weight and the centrifugal force caused by the rotor mass imbalance.

[0031] In one embodiment, the bearing body 1 is an integral unit, providing good sealing; in another embodiment, the bearing body 1 is a split unit, facilitating rotor installation. In this embodiment, the bearing body 1 is a split unit, comprising a first housing and a second housing, which are connected together to form the bearing body 1.

[0032] Specifically, the first housing and the second housing are semi-circular arc-shaped. In this embodiment, the bearing body 1 installation steps include first fixing the first housing onto the unit base, then placing the rotor on the first housing, and finally connecting the first housing and the second housing. By setting the bearing body 1 as a split type, it is easier to install the rotor, thereby improving working efficiency.

[0033] The bearing body 1 is equipped with a tilting pad 2 on its inner wall, and the tilting pad 2 is located between the inner wall of the bearing body 1 and the outer wall of the rotor.

[0034] Specifically, the tilting pad 2 is roughly arc-shaped. The tilting pad 2 can swing freely according to the different rotational speed, load and bearing body 1 of the rotor, forming multiple oil wedges around the journal, and the pressure of each oil film always points to the center, which has high stability.

[0035] The tilting pads 2 can be set in three, four or five, etc., and this application does not make further limitations. In this embodiment, five tilting pads 2 are set, and the five tilting pads 2 are evenly arranged along the circumferential direction of the bearing body 1.

[0036] A pad 3 is provided between the tilting pad 2 and the bearing body 1. The pad 3 is located on the outer wall surface of the tilting pad 2 near the bearing body 1. The pad 3 is used to adjust the radial clearance between the tilting pad 2 and the rotor to ensure that the tilting pad 2 and the rotor can work stably.

[0037] It should be noted that by setting the pad 3, a certain gap is created between the outer wall of the tilting pad 2 and the inner wall of the bearing body 1, which can prevent the tilting pad 2 from rubbing or colliding with the bearing body 1 when it swings, thus extending the service life of the tilting pad bearing and improving the stability of the tilting pad bearing during operation.

[0038] Among them, the pad 3 has a recessed hole 31 on the outer wall of the side near the bearing body 1. The recessed hole 31 is roughly circular and is located in the middle of the pad 3.

[0039] The bearing body 1 has an adjustment through hole 11, which is roughly circular and extends through the bearing body 1 along the radial direction of the rotor.

[0040] Specifically, the through hole 11 and the concave hole 31 are arranged opposite each other in the radial direction of the rotor, that is, the central axis of the through hole 11 and the concave hole 31 coincides.

[0041] The adjusting through hole 11 is provided with a fastening member 5, and the end of the fastening member 5 near the tiltable tile 2 can extend into the recess 31.

[0042] Specifically, the locking element 5 can be a bolt or screw, etc., and this application does not further limit it. It is understood that when the end of the locking element 5 near the tilting pad 2 extends into the recess 31, the locking element 5 can limit the pad 3 in the circumferential direction of the bearing body 1. Since the pad 3 is mounted on the tilting pad 2, when the pad 3 is limited, the tilting pad 2 is also limited. That is to say, the locking element 5 can also limit the tilting pad 2 in the circumferential direction of the bearing body 1 to improve the stability of the tilting pad bearing operation.

[0043] The recess 31 is provided with a damping member 4. When the fastening member 5 extends into the recess 31, the end of the fastening member 5 near the tiltable tile 2 can press against the damping member 4.

[0044] Specifically, in one implementation, the damping element 4 is an elastic element, for example, it can be a spring; in another implementation, the damping element 4 is a flexible element, for example, it can be a flexible pad. In this embodiment, the damping element 4 is a flexible pad. When the rotor speed increases, the rotor amplitude increases, applying a radial force to the tilting pad 2. At this time, the flexible pad can deform to balance the radial force generated by the rotor vibration, thereby reducing the amplitude of the unit and improving the stability and safety of the unit operation.

[0045] It should be noted that by setting the damping element 4, the radial force generated by rotor vibration can be absorbed inside the tilting pad bearing, thereby preventing rotor vibration from causing unit vibration. In this embodiment, by setting the damping element 4, the tilting pad bearing can have a large damping ratio, i.e., vibration reduction capacity.

[0046] In some possible implementations provided in this disclosure, see [link to relevant documentation]. Figure 2 As shown, a groove 21 is provided on the outer wall of the tiltable tile 2, and at least part of the pad 3 is provided in the groove 21.

[0047] By creating a groove 21 on the outer wall of the tilting pad 2, the pad 3 can be embedded into the tilting pad 2 through the groove 21, thus achieving the same position of the pad 3 and the tilting pad 2 in the circumferential direction of the bearing body 1.

[0048] In this embodiment, the groove 21 has the same shape as the pad 3. In this embodiment, the groove 21 is rectangular.

[0049] Specifically, some of the pads 3 are located between the tilting pad 2 and the bearing body 1, which can prevent the outer wall of the tilting pad 2 from rubbing against the inner wall of the bearing body 1, thereby improving the stability of the tilting pad bearing and extending its service life; the other part of the pads 3 are set in the groove 21, which can make the pads 3 and the tilting pad 2 aligned in the circumferential direction of the bearing body 1, so that the fastener 5 can limit the pads 3 in the circumferential direction of the bearing body 1, and at the same time limit the tilting pad 2 in the circumferential direction of the bearing body 1, thereby improving the stability of the tilting pad bearing.

[0050] In some possible implementations provided in this disclosure, see [link to relevant documentation]. Figure 2 As shown, the outer wall surface of the pad 3 near the bearing body 1 is arc-shaped.

[0051] In this embodiment, the bearing body 1 is cylindrical, and the inner wall surface of the bearing body 1 corresponding to the pad 3 is arc-shaped.

[0052] Specifically, by setting the outer wall surface of the pad 3 near the bearing body 1 to be arc-shaped, it can be adapted to the cylindrical bearing body 1, thereby avoiding wear between the outer wall surface of the pad 3 near the bearing body 1 and the inner wall surface of the bearing body 1, which can improve the working stability of the tilting pad bearing and extend its service life.

[0053] In some possible implementations provided in this disclosure, see [link to relevant documentation]. Figure 3 As shown, the pad 3 has a retaining edge 32 on the side near the bearing body 1. The retaining edge 32 is used to limit the pad 3 in the radial direction of the bearing body 1 toward the tiltable pad 2.

[0054] By setting a retaining edge 32 on the side of the pad 3 close to the bearing body 1, the pad 3 can be limited in the radial direction of the bearing body 1 toward the tilting pad 2, which can prevent the tilting pad 2 from directly contacting the bearing body 1 and causing wear, thereby extending the service life of the tilting pad bearing.

[0055] Two flanges 32 are provided, and the two flanges 32 are arranged on both sides of the pad block 3 along the circumferential direction of the bearing body 1.

[0056] Specifically, the retaining edge 32 and the pad 3 can be integrally formed, with the retaining edge 32 located at the end of the pad 3 near the bearing body 1. When the pad 3 is embedded in the groove 21, the retaining edge 32 can rest on the outer wall surface of the tilting pad 2 near the bearing body 1, preventing the pad 3 from being completely embedded in the groove 21.

[0057] In some possible embodiments provided in this disclosure, the locking member 5 includes a screwing section having an external thread, and the adjusting through hole 11 having an internal thread. The adjusting through hole 11 and the screwing section are connected by the internal and external threads.

[0058] The fastening member 5 includes a head, which is positioned away from the tiltable tile 2.

[0059] Specifically, the part of the fastener 5 near its head is a screwing section. The outer peripheral wall of the screwing section is provided with an external thread, and the inner wall of the adjustment through hole 11 is provided with an internal thread that matches the external thread on the screwing section, so that the fastener 5 can move along the axial direction of the adjustment through hole 11 and be fixed in a preset position.

[0060] It should be noted that by setting the adjustment through hole 11 and the screwing section to be connected by internal and external threads, the operator can adjust the radial clearance between the rotor and the tilting pad 2 by screwing the fixing part 5 according to the rotor speed, thereby improving the working stability of the tilting pad bearing.

[0061] In some possible embodiments provided in this disclosure, the fastening member 5 further includes a limiting section, which is disposed on the side of the screwing section near the tiltable tile 2, and the end of the limiting section near the tiltable tile 2 is movably disposed in the recess 31.

[0062] The fastener 5 also includes a tail section, which is positioned close to the tiltable tile 2.

[0063] Specifically, the portion of the retaining member 5 near its tail is a limiting section. The outer diameter of the limiting section is smaller than the inner diameter of the adjusting through hole 11, so that the limiting section can penetrate the adjusting through hole 11 and extend into the recess 31. At the same time, the outer diameter of the limiting section is also smaller than the inner diameter of the recess 31. When the tilting pad 2 is affected by the radial force generated by the rotor vibration, the position of the tilting pad 2 and the pad 3 on it relative to the retaining member 5 will change under the action of the damping member 4, thereby reducing the radial force on the retaining member 5, so that the position of the retaining member 5 remains unchanged or only changes slightly, thus achieving the purpose of reducing the amplitude of the unit.

[0064] In some possible embodiments provided in this disclosure, the damper 4 is made of nitrile rubber.

[0065] Nitrile rubber is a copolymer of acrylonitrile and butadiene monomers. It has excellent oil resistance, high wear resistance, good heat resistance, and also has a certain degree of elasticity and strength.

[0066] Specifically, by making the damping component 4 with nitrile rubber, the service life of the damping component 4 can be extended, and frequent replacement of the damping component in the tilting pad bearing can be avoided.

[0067] In some possible embodiments provided in this disclosure, the tilting pad bearing further includes two oil retaining rings, which are respectively disposed at both ends of the bearing body 1 along the axial direction of the bearing body 1.

[0068] By setting oil retaining rings at both ends of the bearing body 1, the lubricating oil in the bearing body 1 cavity can be prevented from being thrown out, which can ensure that the amount of lubricating oil in the bearing body cavity meets the requirements of the tilting pad bearing, thereby improving the stability of the tilting pad bearing operation.

[0069] Two oil baffles are provided, and the two oil baffles are respectively located at both ends of the bearing body 1.

[0070] The tilting pad bearing provided in the embodiments of this utility model can increase the damping ratio of the bearing by setting the vibration damping element 4, so as to reduce the amplitude of the bearing and have a good vibration reduction effect, thereby improving the stability and safety of the unit operation.

[0071] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0072] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A tilting pad bearing, characterized in that, The device includes a bearing body (1), a tilting pad (2), and a pad (3). The tilting pad (2) is located inside the bearing body (1), and the pad (3) is located between the tilting pad (2) and the bearing body (1). A recess (31) is provided in the middle of the outer side wall of the pad (3). A damping member (4) is provided in the recess (31). An adjustment through hole (11) corresponding to the recess (31) is provided on the bearing body (1). A fastening member (5) is provided in the adjustment through hole (11). The end of the fastening member (5) near the tilting pad (2) can be inserted into the recess (31) and pressed against the damping member (4).

2. The tilting pad bearing according to claim 1, characterized in that, The outer wall of the tiltable tile (2) is provided with a groove (21), and at least part of the pad (3) is provided in the groove (21).

3. The tilting pad bearing according to claim 1, characterized in that, The outer wall surface of the pad (3) near the bearing body (1) is arc-shaped.

4. The tilting pad bearing according to claim 1, characterized in that, The pad (3) has a retaining edge (32) on the side near the bearing body (1), the retaining edge (32) being used to limit the pad (3) in the radial direction of the bearing body (1) toward the tilting tile (2).

5. The tilting pad bearing according to claim 1, characterized in that, The fastening member (5) includes a screwing section with an external thread, and the adjusting through hole (11) has an internal thread. The adjusting through hole (11) and the screwing section are connected by the internal thread and the external thread.

6. The tilting pad bearing according to claim 5, characterized in that, The fastening member (5) also includes a limiting section, which is disposed on the side of the screwing section near the tiltable tile (2), and the end of the limiting section near the tiltable tile (2) is movably disposed in the recess (31).

7. The tilting pad bearing according to claim 1, characterized in that, Several tiltable tiles (2) are provided, and the several tiltable tiles (2) are evenly arranged along the circumferential direction of the bearing body (1).

8. The tilting pad bearing according to claim 1, characterized in that, The bearing body (1) includes a first housing and a second housing, the first housing and the second housing are semi-circular arc-shaped, and the bearing body (1) is formed by connecting the first housing and the second housing together.

9. The tilting pad bearing according to claim 1, characterized in that, The vibration damping component (4) is made of nitrile rubber.

10. The tilting pad bearing according to claim 1, characterized in that, The tilting pad bearing also includes oil baffles, and two oil baffles are provided, which are respectively provided at both ends of the bearing body (1) along the axial direction of the bearing body (1).

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