CN211550262U - Elliptical bearing for gas turbine - Google Patents

Abstract

The utility model provides an elliptical bearing for gas turbine, include: the center of a circle corresponding to a first inner arc surface of the upper half bearing tile is offset downwards relative to the center of the bearing along a vertical datum line by a distance L1, and the radius corresponding to the first inner arc surface is R1; the three-section type line structure of the lower half tile of the bearing comprises a second inner arc surface and third inner arc surfaces symmetrically distributed on two sides of the second inner arc surface, the circle center corresponding to the second inner arc surface coincides with the center of the bearing, the radius corresponding to the second inner arc surface is R2, the central angle corresponding to the second inner arc surface is alpha, the distance of the circle center corresponding to the third inner arc surface, which is upwards offset relative to the center of the bearing along a vertical reference line, is L2, and the radius corresponding to the third inner arc surface is R3. The utility model discloses have more excellent radial shock resistance, more be favorable to reducing elliptical bearing's consumption, make elliptical bearing keep the lower temperature state in the high-speed operation of axle journal.

Description

Elliptical bearing for gas turbine

Technical Field

The utility model relates to a gas turbine technical field especially relates to an elliptical bearing for gas turbine.

Background

The rotor bearing system is an important component of the gas turbine, and the bearing is used for ensuring the rotor to rotate as a fixed shaft and bearing the static and action forces of the rotor. The radial bearing lifts the journal through an oil wedge at the bottom of the bearing, and liquid friction is formed between the journal and the bearing to bear the radial force of the rotor.

With the continuous increase of the capacity of the gas turbine generator set, the size of a rotor shaft neck is continuously increased, the linear speed is increased, and the operation condition of a bearing is worse. The conventional bearing can not meet the normal operation requirement and is easy to destabilize. The existing elliptical bearing comprises an upper half shoe and a lower half shoe of the bearing, the inner peripheral wall of the upper half shoe of the bearing and the inner peripheral wall of the lower half shoe of the bearing are both formed by arc surfaces, and a shaft neck rotates and is unstable in a conventional bearing.

SUMMERY OF THE UTILITY MODEL

In view of the above prior art's shortcoming, the to-be-solved technical problem of the utility model is to provide an elliptical bearing for gas turbine, have more excellent radial shock resistance, more be favorable to reducing elliptical bearing's consumption, make elliptical bearing keep the lower temperature state in the high-speed operation of axle journal.

In order to solve the technical problem, the utility model provides an elliptical bearing for gas turbine, elliptical bearing have the bearing center, make horizontal datum line and vertical datum line through the bearing center, elliptical bearing includes:

the outer circumferential wall of the upper half tile of the bearing is a first outer arc surface, the circle center corresponding to the first outer arc surface is overlapped with the center of the bearing, the inner circumferential wall of the upper half tile of the bearing is a first inner arc surface, the distance of the circle center corresponding to the first inner arc surface, which is offset downwards relative to the center of the bearing along a vertical datum line, is L1, and the radius corresponding to the first inner arc surface is R1;

the outer peripheral wall of the lower half tile of the bearing is a second outer arc surface, the circle center corresponding to the second outer arc surface is overlapped with the center of the bearing, the inner peripheral wall of the lower half tile of the bearing is of a three-section type line structure, the three-section type line structure comprises a second inner arc surface and third inner arc surfaces symmetrically distributed on two sides of the second inner arc surface, the circle center corresponding to the second inner arc surface is overlapped with the center of the bearing, the radius corresponding to the second inner arc surface is R2, the central angle corresponding to the second inner arc surface is alpha, the distance of upward offset of the circle center corresponding to the third inner arc surface relative to the center of the bearing along a vertical reference line is L2, and the radius corresponding to the third inner arc surface is R3;

the oil groove structure is arranged at the middle split surface of the upper half tile and the lower half tile of the bearing and comprises an upper half oil groove arranged on the upper half tile of the bearing and a lower half oil groove arranged on the lower half tile of the bearing, the upper half oil groove is a fourth inner arc surface, the distance of the circle center corresponding to the fourth inner arc surface, which is offset downwards relative to the center of the bearing along a vertical reference line, is L3, the radius corresponding to the fourth inner arc surface is R4, the circle center corresponding to the center of the bearing is beta, the lower half oil groove is a fifth inner arc surface, the distance of the circle center corresponding to the fifth inner arc surface, which is offset upwards relative to the center of the bearing along the vertical reference line, is L4, the radius corresponding to the fifth inner arc surface is R5, and the circle center angle corresponding to the center of the fifth inner arc surface is L4;

R2＜R1＝R3，R4＞R5，≤α≤180°-，L3＞L1＞L2，L3＞L4＞L2。

preferably, the central angle > the central angle β.

As described above, the elliptical bearing for a gas turbine of the present invention has the following advantageous effects: the utility model discloses in, compare in current oval bearing, the periphery wall of half tile on the bearing and the periphery wall of half tile under the bearing do not change. Compared with the existing elliptical bearing, the inner peripheral wall of the upper half tile of the bearing and the inner peripheral wall of the lower half tile of the bearing are optimally designed as follows: the distance of the circle center corresponding to the first inner arc surface, which is offset downwards relative to the center of the bearing along a vertical datum line, is L1, the radius corresponding to the first inner arc surface is R1, the inner peripheral wall of the lower half tile of the bearing is of a three-section type line structure, the three-section type line structure comprises a second inner arc surface and third inner arc surfaces which are symmetrically distributed on two sides of the second inner arc surface, the circle center corresponding to the second inner arc surface is overlapped with the center of the bearing, the radius corresponding to the second inner arc surface is R2, the central angle corresponding to the second inner arc surface is alpha, the distance of the circle center corresponding to the third inner arc surface, which is offset upwards relative to the center of the bearing along the vertical datum line, is L2, the radius corresponding to the third inner arc surface is R3, R2 < R1 is R3, L1 is greater than L2, and the design is characterized in that compared with the existing elliptical bearing, the top thickness of the upper half tile of the bearing is thicker, the bottom thickness, that is to say, the absolute eccentricity of axle journal in the bearing half tile diminishes, and the absolute eccentricity of axle journal in the bearing half tile has become, and the axle journal is more easily sticis the internal perisporium of bearing half tile down and is rotating, again because the bearing half tile is mainly to hold the thing and the bearing half tile does not bear the force basically under the axle journal rotates the in-process bearing half tile, wholly speaking, the axle journal is in the utility model discloses an oval bearing is interior vibration is littleer, rotates more steadily, and oval bearing for gas turbine has more excellent radial shock resistance promptly. In addition, the oil groove structure is arranged at the middle dividing plane of the upper half tile of the bearing and the lower half tile of the bearing, the oil groove structure comprises an upper oil groove arranged on the upper half tile of the bearing and a lower oil groove arranged on the lower half tile of the bearing, the upper oil groove is a fourth inner arc surface, the distance of the center of a circle corresponding to the fourth inner arc surface, which is downwards offset along a vertical reference line relative to the center of the bearing, is L3, the radius of the fourth inner arc surface is R4, the center angle of the fourth inner arc surface, which is beta relative to the center of the bearing, the lower oil groove is a fifth inner arc surface, the distance of the center of a circle corresponding to the fifth inner arc surface, which is upwards offset along the vertical reference line relative to the center of the bearing, is L4, the radius of the inner circle corresponding to the fifth arc surface is R5, the center angle of the fifth inner arc surface relative to the center of the bearing, is R4 > R5, L3 > L1, L3 > L4 > L2, and the design that the oil inlet section of, more turbine oil enters the lower half tile of the bearing, the heat dissipation efficiency and the lubrication effect of the lower half tile of the bearing are improved, the power consumption of the elliptical bearing is reduced, and the elliptical bearing is kept in a lower temperature state in the high-speed operation of the shaft neck.

Drawings

Fig. 1 is a schematic view of an elliptical bearing for a gas turbine according to the present invention.

Description of the element reference numerals

1 bearing center

2 horizontal datum line

3 vertical reference line

4 bearing upper half tile

41 first outer arc surface

42 first inner arc surface

5 bearing lower half tile

51 second outer arc surface

52 second inner arc surface

53 third inner arc surface

6 oil groove structure

61 fourth inner arc surface

62 fifth inner arc surface

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

It should be understood that the structures, ratios, sizes, etc. shown in the drawings of the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any modification of the structures, changes of the ratio relationship, or adjustment of the sizes should still fall within the scope covered by the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

As shown in fig. 1, the utility model provides an elliptical bearing for gas turbine, elliptical bearing have bearing center 1, make horizontal datum line 2 and vertical datum line 3 through bearing center 1, and above-mentioned elliptical bearing includes:

the bearing comprises an upper half tile 4 of the bearing, wherein the outer peripheral wall of the upper half tile 4 of the bearing is a first outer arc surface 41, the circle center corresponding to the first outer arc surface 41 is overlapped with the bearing center 1, the inner peripheral wall of the upper half tile 4 of the bearing is a first inner arc surface 42, the circle center corresponding to the first inner arc surface 42 is offset downwards along a vertical reference line 3 relative to the bearing center 1 by a distance L1, and the radius corresponding to the first inner arc surface 42 is R1;

the outer peripheral wall of the lower bearing half tile 5 is a second outer arc surface 51, the circle center corresponding to the second outer arc surface 51 coincides with the bearing center 1, the inner peripheral wall of the lower bearing half tile 5 is a three-section type line structure, the three-section type line structure comprises a second inner arc surface 52 and third inner arc surfaces 53 symmetrically distributed on two sides of the second inner arc surface 52, the circle center corresponding to the second inner arc surface 52 coincides with the bearing center 1, the radius corresponding to the second inner arc surface 52 is R2, the circle center angle corresponding to the second inner arc surface 52 is alpha, the distance of upward offset of the circle center corresponding to the third inner arc surface 53 relative to the bearing center 1 along the vertical reference line 3 is L2, and the radius corresponding to the third inner arc surface 53 is R3;

the bearing comprises an oil groove structure 6, the oil groove structure 6 is arranged at the middle split surface of an upper half-tile 4 of the bearing and a lower half-tile 5 of the bearing, the oil groove structure 6 comprises an upper half oil groove arranged on the upper half-tile 4 of the bearing and a lower half oil groove arranged on the lower half-tile 5 of the bearing, the upper half oil groove is a fourth inner arc surface 61, the distance of the center of a circle corresponding to the fourth inner arc surface 61 offset downwards relative to the center 1 of the bearing along a vertical reference line 3 is L3, the radius corresponding to the fourth inner arc surface 61 is R4, the center angle of the fourth inner arc surface 61 corresponding to the center 1 of the bearing is beta, the lower half oil groove is a fifth inner arc surface 62, the distance of the center of a circle corresponding to the fifth inner arc surface 62 offset upwards relative to the center 1 of the bearing along the vertical reference line 3 is L4, the radius corresponding to the fifth inner arc surface 62 is R5, and the center angle of the fifth inner arc surface 62;

R2＜R1＝R3，R4＞R5，≤α≤180°-，L3＞L1＞L2，L3＞L4＞L2。

the utility model discloses in, compare in current oval bearing, the periphery wall of the first half tile 4 of bearing and the periphery wall of the second half tile 5 of bearing do not change, and the periphery wall of the first half tile 4 of bearing is first outer arc surface 41 promptly, and the centre of a circle that first outer arc surface 41 corresponds coincides with bearing center 1, and the periphery wall of the second half tile 5 of bearing is second outer arc surface 51, the centre of a circle that second outer arc surface 51 corresponds coincides with bearing center 1. Compared with the existing elliptical bearing, the inner peripheral wall of the upper half-shoe 4 of the bearing and the inner peripheral wall of the lower half-shoe 5 of the bearing are optimally designed as follows: the distance of the center of the circle corresponding to the first inner arc surface 42 offset downwards relative to the bearing center 1 along the vertical reference line 3 is L1, the radius corresponding to the first inner arc surface 42 is R1, the inner peripheral wall of the lower half tile 5 of the bearing is of a three-section type line structure, the three-section type line structure comprises a second inner arc surface 52 and third inner arc surfaces 53 symmetrically distributed on two sides of the second inner arc surface 52, the center of the circle corresponding to the second inner arc surface 52 is overlapped with the bearing center 1, the radius corresponding to the second inner arc surface 52 is R2, the center angle corresponding to the second inner arc surface 52 is alpha, the distance of the center of the circle corresponding to the third inner arc surface 53 offset upwards relative to the bearing center 1 along the vertical reference line 3 is L2, the radius corresponding to the third inner arc surface 53 is R3, R2 < R1 is R3, L1 > L2, and the design is that the top thickness of the half tile 4 on the bearing is thicker compared with the existing elliptical bearing, the bottom thickness attenuation of half tile 5 under the bearing, that is to say, the absolute eccentricity of journal in half tile 4 on the bearing diminishes, and the absolute eccentricity of journal in half tile 5 under the bearing has grown, and the journal is more easily pressing the internal perisporium of half tile 5 under the bearing and rotating, again because the bearing is main bearing spare and half tile 4 on the bearing does not bear the force basically under the journal rotates the in-process bearing half tile 5, wholly speaking, the journal is in the utility model discloses an oval bearing is interior vibration littleer, rotates more steadily, and oval bearing for the gas turbine has more excellent radial shock resistance promptly.

In addition, the oil groove structure 6 is arranged at the middle dividing plane of the upper half-tile 4 of the bearing and the lower half-tile 5 of the bearing, the oil groove structure 6 comprises an upper half oil groove arranged on the upper half-tile 4 of the bearing and a lower half oil groove arranged on the lower half-tile 5 of the bearing, the upper half oil groove is a fourth inner arc surface 61, the distance of the center of the circle corresponding to the fourth inner arc surface 61 offset downwards relative to the center 1 of the bearing along the vertical reference line 3 is L3, the radius of the circle corresponding to the fourth inner arc surface 61 is R4, the center angle of the circle corresponding to the fourth inner arc surface 61 relative to the center 1 of the bearing is beta, the lower half oil groove is a fifth inner arc surface 62, the distance of the center of the circle corresponding to the center 1 of the bearing is L4, the radius of the circle corresponding to the fifth inner arc surface 62 is R5, the center angle of the fifth inner arc surface 62 relative to the center 1 of the bearing is R4 > R5, l3 is more than L1, L3 is more than L4 is more than L2, and by the design, the oil inlet cross section of the lower half oil groove is larger than that of the upper half oil groove, so that more turbine oil (namely turbine oil which generally has high temperature resistance and wear resistance) enters the lower half tile 5 of the bearing, the heat dissipation efficiency and the lubrication effect of the lower half tile 5 of the bearing are improved, the power consumption of the elliptical bearing is reduced, and the elliptical bearing is kept in a lower temperature state in the high-speed operation of a shaft neck.

The central angle is larger than the central angle beta.

To sum up, the utility model discloses an elliptical bearing for gas turbine has more excellent radial shock resistance, more is favorable to reducing elliptical bearing's consumption, makes elliptical bearing keep the lower temperature state in the high-speed operation of axle journal. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (2)

1. An oval bearing for a gas turbine, the oval bearing having a bearing center (1), a horizontal reference line (2) and a vertical reference line (3) passing through the bearing center (1), the oval bearing comprising:

the bearing comprises an upper half tile (4) of a bearing, wherein the outer peripheral wall of the upper half tile (4) of the bearing is a first outer arc surface (41), the circle center corresponding to the first outer arc surface (41) is overlapped with the center (1) of the bearing, the inner peripheral wall of the upper half tile (4) of the bearing is a first inner arc surface (42), the distance of the circle center corresponding to the first inner arc surface (42) which is offset downwards relative to the center (1) of the bearing along a vertical reference line (3) is L1, and the radius corresponding to the first inner arc surface (42) is R1;

the bearing lower half tile (5), the outer peripheral wall of the bearing lower half tile (5) is a second outer arc surface (51), the circle center corresponding to the second outer arc surface (51) is overlapped with the bearing center (1), the inner peripheral wall of the bearing lower half tile (5) is of a three-section type line structure, the three-section type line structure comprises a second inner arc surface (52) and third inner arc surfaces (53) symmetrically distributed on two sides of the second inner arc surface (52), the circle center corresponding to the second inner arc surface (52) is overlapped with the bearing center (1), the radius corresponding to the second inner arc surface (52) is R2, the circle center angle corresponding to the second inner arc surface (52) is alpha, the distance of upward offset of the circle center corresponding to the third inner arc surface (53) relative to the bearing center (1) along a vertical reference line (3) is L2, and the radius corresponding to the third inner arc surface (53) is R3;

the bearing comprises an oil groove structure (6), the oil groove structure (6) is arranged at the middle split surface of an upper half tile (4) of the bearing and a lower half tile (5) of the bearing, the oil groove structure (6) comprises an upper half oil groove arranged on the upper half tile (4) of the bearing and a lower half oil groove arranged on the lower half tile (5) of the bearing, the upper half oil groove is a fourth inner arc surface (61), the distance between the circle center corresponding to the fourth inner arc surface (61) and the center of the bearing along a vertical datum line (3) is L3, the radius corresponding to the fourth inner arc surface (61) is R4, the circle center angle corresponding to the fourth inner arc surface (61) and the center of the bearing (1) is beta, the lower half oil groove is a fifth inner arc surface (62), the distance between the circle center corresponding to the fifth inner arc surface (62) and the center of the bearing along the vertical datum line (3) is L4, and the radius corresponding to the fifth inner arc surface (62) is R5, the central angle of the fifth inner arc surface (62) corresponding to the bearing center (1) is;

R2＜R1＝R3，R4＞R5，≤α≤180°-，L3＞L1＞L2，L3＞L4＞L2。

2. the elliptical bearing for a gas turbine according to claim 1, characterized in that: the central angle > the central angle beta.

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