CN210919849U

CN210919849U - Rotor bearing

Info

Publication number: CN210919849U
Application number: CN201921285402.5U
Authority: CN
Inventors: 陶海亮; 张陈慧; 王睿男
Original assignee: Siemens Ltd China
Current assignee: Siemens Ltd China
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2020-07-03
Anticipated expiration: 2029-08-08

Abstract

The utility model provides a rotor bearing, include: a bearing housing, the bearing further comprising: the elastic ring is mounted on the outer side mounting surface of the elastic ring and the bearing seat, a first boss is formed on the outer side mounting surface, and a second boss is formed on the inner side mounting surface; a pad mounted with an inner mounting surface of the elastic ring; first oilhole has been seted up on the first boss, first boss to the bearing frame is protruding, first oilhole with form first damping chamber between the bearing frame, the second oilhole has been seted up on the second boss, the second boss to the tile fragment is protruding, the second oilhole with form second damping chamber between the tile fragment, the utility model relates to a rotor bearing, through quantity and the thickness of adjusting the boss in order to adjust rigidity, still through the oil film damping that the damping chamber that forms respectively between elastic ring and bearing frame, the tile fragment provided, has reduced rotor vibration level, has improved rotating machinery's steady operation, improves the flexibility of rotor bearing design.

Description

Rotor bearing

Technical Field

The utility model relates to a rotor bearing, thereby in particular to the rotor bearing of the vibration level when thereby the critical speed of adjustable bearing's braced system rigidity regulation rotor and reduction rotor pass through critical speed.

Background

In the field of rotating machinery, in order to improve the efficiency and power density of equipment such as steam turbines, compressors, etc., rotors are often referred to as high aspect ratio, long span, high rotational speed, and therefore the rotor system may be equivalent to a flexible rotor system of rigid bearings. Thus placing extremely high demands on the structural design and stable operation of the rotor.

Typically, when the operating speed of such a rotor is higher than a first-order critical speed, i.e. the rotor passes through the critical speed, the bearing support system of the rotor cannot provide sufficient damping, resulting in a high rotor amplitude. Meanwhile, the working condition of the rotor operation is responsible, the rotating speed change interval is large, and in order to ensure that the critical rotating speed is excluded from the working rotating speed interval, the design requirement is met by adjusting the rotor structure or the bearing structure.

In order to overcome the above problems, a commonly adopted solution includes: from the perspective of ensuring that the rotor system has sufficient damping, sliding bearings may be employed to provide external damping. Alternatively, the bearing stiffness may be adjusted by adjusting the critical speed of the rotor outside the operating speed interval.

However, for solutions using sliding bearings to provide additional damping, the stiffness and damping of the bearings are mainly related to the bearing geometry, i.e. the damping of the bearings can be increased by reducing the radial clearance, but the stiffness of the bearings also increases so that the effective damping value of the rotor system cannot be increased significantly. Therefore, a bearing support system with adjustable stiffness and damping respectively is needed to obtain a bearing support system with high damping and low stiffness.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can solve above-mentioned and/or other technical problem's rotor bearing, can independently adjust the braced system's of bearing rigidity, and then adjust the critical speed of rotor and reduce the vibration level when the rotor passes through critical speed to guarantee that the rotor operation is stable safety, can improve the stable safe operation based on rotating machinery such as steam turbine, compressor, gas turbine, improve the flexibility of rotor design.

The utility model discloses a rotor bearing, include, the bearing frame, this bearing still includes: the elastic ring comprises an outer side mounting surface and an inner side mounting surface, the outer side mounting surface of the elastic ring is mounted with the bearing seat, a first boss is formed on the outer side mounting surface, and a second boss is formed on the inner side mounting surface; the pad is mounted with the inner side mounting surface of the elastic ring; the bearing seat is provided with a bearing block, the bearing block is provided with a bearing seat, the bearing block is provided with a bearing block, the bearing block is provided with a bearing hole, the bearing block is provided with a bearing seat, the bearing block is provided with a bearing hole, the bearing hole is provided. Therefore, the rigidity adjustment of the rotor bearing can be realized by adjusting the thickness and the number of the bosses, and the oil film damping provided by the damping cavity formed between the elastic ring and the bearing seat and the oil film damping provided by the damping cavity formed between the elastic ring and the pad block, so that the rigidity and the damping of the rotor bearing are improved, the critical rotating speed of the rotor is adjusted, the vibration level of the rotor passing through the critical rotating speed is reduced, and the stable and safe operation of the rotor is ensured.

Optionally, the first bosses of the rotor bearing are configured to be circumferentially spaced along the outer mounting surface, and the second bosses are configured to be circumferentially spaced along the inner mounting surface. Therefore, the rigidity of the rotor bearing can be adjusted by setting the number of the bosses.

Alternatively, the bearing housing of the rotor bearing is configured with a first oil groove corresponding to the first oil hole through which the lubricating oil flows. Therefore, in the rotor bearing, when the lubricating oil flows into the oil hole formed in the elastic ring through the oil groove formed in the bearing seat, the damping cavity formed between the bearing seat and the oil hole of the elastic ring is formed, so that oil film damping is formed, and the lubricating oil is ensured to flow into the damping cavity between the elastic ring and the pad through the oil hole of the elastic ring, so that another oil film damping is provided, and the vibration level of the rotor can be reduced.

Optionally, the bearing seat of the rotor bearing is configured with at least one positioning groove corresponding to the mounting position of the elastic ring on the bearing. Thus, the elastic ring of the rotor bearing can be fixedly connected to the bearing housing.

Optionally, the elastic ring of the rotor bearing is configured with a mounting lug at a position corresponding to the positioning slot, the mounting lug is configured with at least one mounting hole, and the mounting lug and the positioning slot are fixedly connected by being mounted in the mounting hole through at least one nut. Thus, the elastic ring of the rotor bearing can be fixedly connected to the bearing housing.

Optionally, at least one mounting hole is formed on an inner mounting surface of the rotor bearing where the elastic ring and the pad are mounted, the pad is formed with a bolt corresponding to the mounting hole, and the elastic ring and the pad are fixedly connected by being mounted in the mounting hole through the bolt.

Alternatively, the pad of the rotor bearing is configured with a second oil groove corresponding to the position of the second oil hole, and the lubricating oil flows into the second oil groove through at least the second oil hole. Thus, the lubricating oil flowing into the bearing shaft can be drained through the oil grooves on the pads.

Optionally, the pads of the rotor bearing are tilt pads. Therefore, the rotor bearing enables each pad to tilt in any direction due to the use of the tilting pads as the support surfaces, thereby providing stability in operation of the rotor bearing.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein the content of the first and second substances,

FIG. 1 is a cross-sectional view illustrating a rotor bearing according to an exemplary embodiment;

FIG. 2 is an assembled cross-sectional view illustrating a rotor bearing according to an exemplary embodiment;

FIG. 3 is an exploded view illustrating a rotor bearing according to an exemplary embodiment;

fig. 4 is a view illustrating an elastic ring structure of a rotor bearing according to an exemplary embodiment.

10: rotor bearing 1: bearing seat

101: oil groove 102: locating slot

2: the elastic ring 201: mounting ear

202: oil hole 203: first boss

204: second boss 3: tilting pad

301: bolt

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings, in which like reference numerals refer to like parts in the drawings.

Fig. 1 is a sectional view illustrating a rotor bearing according to an exemplary embodiment.

As shown in fig. 1, the rotor bearing 10 may include: a bearing support 1, a resilient ring 2 and a tilt pad 3. The bearing seat 1 and the elastic ring 2 are installed through an outer installation surface of the elastic ring 2. The inner mounting surface of the elastic ring 2 is mounted with the tilt pad.

Fig. 2 is an assembled sectional view illustrating a rotor bearing according to an exemplary embodiment, and fig. 3 is an exploded view illustrating a rotor bearing according to an exemplary embodiment.

As shown in fig. 2 and 3, the surface of the bearing seat 1 to which the elastic ring 2 is mounted is provided with a positioning groove 101 and an oil groove 102. The elastic ring 2 is provided with mounting lugs 201 and oil holes 202. The oil groove 102 may be located opposite to the oil hole 202 provided in the elastic ring 2 such that a damping cavity is formed between the oil hole 202 and the bearing housing 1, and when the lubricating oil may flow into the damping cavity formed between the oil hole 202 and the bearing housing through the oil groove 102, an oil film cavity is formed to provide oil film damping.

An oil groove is provided at a position opposite to the oil hole 202 provided on the tilting pad 3 and the elastic ring 2, so that another damping cavity is formed between the oil hole 202 and the tilting pad, and when the lubricating oil flows into the oil groove of the tilting pad 3 through the oil hole 202, i.e., into the damping cavity formed between the oil hole 202 and the tilting pad 3, another oil film cavity is formed to provide another additional oil film damping.

The fixed connection between the elastic ring 2 and the bearing seat 1 can be installed by matching between the installation lug 201 arranged on the elastic ring 2 and the positioning groove 101. Can set up a screw on the installation ear 201, can set up a screw on the relative position of constant head tank 101 and this screw for can fix through a bolt between installation ear 201 and the constant head tank 101, prevent that circumference and axial slip from appearing between elastic ring 2 and the bearing frame 1.

The fixed connection between the tilting pad 3 and the elastic ring 2 can be fixed by the bolt 301 arranged on the outer mounting surface of the tilting pad 3 and the mounting hole on the elastic ring 2 opposite to the bolt 301, so as to prevent the tilting pad 3 and the elastic ring 2 from sliding in the circumferential direction and the axial direction.

As shown in fig. 3, the elastic ring 2 may be provided with a plurality of first bosses 203, second bosses 204 in a direction along its circumferential direction, and at least one oil hole 202 is provided on each of the

bosses

203, 204.

As shown in fig. 4, the elastic ring 2 may be provided with a plurality of first bosses 203 and second bosses 204 in a direction along its circumferential direction. The first boss 203 and the second boss may be provided with oil holes 202, respectively. The first boss 203 may project in the direction of the carrier 1 and the second boss 204 may project in the direction of the tilt pad 3. The plurality of first bosses 203 projecting in the bearing 1 direction and the plurality of second bosses 204 projecting in the tilt pad 3 direction may be provided at intervals in the circumferential direction of the elastic ring 2.

The first boss 203 protruding toward the bearing seat 1 may form a damping chamber between the oil hole 202 and the bearing seat 1. And a second boss 204 protruding towards the tilting pad 3, wherein a damping cavity can be formed between the oil hole 202 of the second boss and the tilting pad 3.

In order to make the rotor bearing 10 have a certain rigidity, the number of the first bosses 203 and the second bosses 204 arranged on the elastic ring 2 and the thicknesses of the first bosses 203 and the second bosses 204 can be adjusted and replaced, so that the design of the rotor bearing 10 is more flexible.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims

1. A rotor bearing comprising: bearing frame (1), its characterized in that, the rotor bearing still includes:

the bearing seat comprises an elastic ring (2), wherein the elastic ring (2) comprises an outer mounting surface and an inner mounting surface, the outer mounting surface of the elastic ring (2) is mounted with the bearing seat (1), a first boss (203) is formed on the outer mounting surface, and a second boss (204) is formed on the inner mounting surface;

the pad (3) is mounted with the inner side mounting surface of the elastic ring (2);

the bearing seat is characterized in that at least one first oil hole is formed in the first boss (203), the first boss (203) protrudes towards the bearing seat (1), a first damping cavity is formed between the first oil hole and the bearing seat (1), at least one second oil hole is formed in the second boss (204), the second boss (204) protrudes towards the pad (3), and a second damping cavity is formed between the second oil hole and the pad (3).

2. The rotor bearing according to claim 1, wherein the first bosses (203) are configured to be circumferentially spaced along the outer mounting surface and the second bosses (204) are configured to be circumferentially spaced along the inner mounting surface.

3. The rotor bearing according to claim 1, wherein the bearing housing (1) is provided with a first oil groove (101) corresponding to the first oil hole, and the lubricating oil flows into the first oil hole through the first oil groove (101).

4. The rotor bearing according to claim 1, wherein the bearing seat (1) is provided with at least one positioning groove (102), and the positioning groove (102) corresponds to the installation position of the elastic ring (2) on the bearing seat (1).

5. The rotor bearing according to claim 4, wherein the elastic ring is provided with a mounting ear (201) at a position corresponding to the positioning slot, the mounting ear (201) is provided with at least one mounting hole, and the mounting ear (201) and the positioning slot (102) are fixedly connected through at least one nut mounted in the mounting hole.

6. The rotor bearing according to claim 1, wherein at least one mounting hole is formed in an inner mounting surface where the elastic ring (2) and the pad (3) are mounted, a bolt (301) corresponding to the mounting hole is formed in the pad (3), and the elastic ring (2) and the pad (3) are fixedly connected through the bolt (301) mounted in the mounting hole.

7. The rotor bearing according to claim 1, wherein the pad (3) is configured with a second oil groove corresponding to the position of the second oil hole, through which lubricating oil flows at least.

8. Rotor bearing according to any of claims 1-7, wherein the pad (3) is a tilting pad.