CN111140594B - Elliptic bearing for gas turbine - Google Patents

Elliptic bearing for gas turbine Download PDF

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Publication number
CN111140594B
CN111140594B CN202010035565.9A CN202010035565A CN111140594B CN 111140594 B CN111140594 B CN 111140594B CN 202010035565 A CN202010035565 A CN 202010035565A CN 111140594 B CN111140594 B CN 111140594B
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China
Prior art keywords
bearing
arc surface
center
inner arc
circle center
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CN111140594A (en
Inventor
沈敏
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Shanghai Electric Gas Turbine Co ltd
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Shanghai Electric Gas Turbine Co ltd
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Priority to CN202010035565.9A priority Critical patent/CN111140594B/en
Publication of CN111140594A publication Critical patent/CN111140594A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
    • F16C17/24—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with devices affected by abnormal or undesired positions, e.g. for preventing overheating, for safety
    • F16C17/243—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with devices affected by abnormal or undesired positions, e.g. for preventing overheating, for safety related to temperature and heat, e.g. for preventing overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/06—Arrangements of bearings; Lubricating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
    • F16C17/24—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with devices affected by abnormal or undesired positions, e.g. for preventing overheating, for safety
    • F16C17/246—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with devices affected by abnormal or undesired positions, e.g. for preventing overheating, for safety related to wear, e.g. sensors for measuring wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/046—Brasses; Bushes; Linings divided or split, e.g. half-bearings or rolled sleeves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N1/00—Constructional modifications of parts of machines or apparatus for the purpose of lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/23—Gas turbine engines

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

The invention provides an elliptical bearing for a gas turbine, which comprises an upper half bearing bush, wherein the distance of a circle center corresponding to a first inner arc surface of the upper half bearing bush 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 three-section type line structure of the lower half bearing bush 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 circle center angle corresponding to the second inner arc surface is alpha, the distance of the circle center corresponding to the third inner arc surface to the center of the bearing along the vertical datum line is L2, and the radius corresponding to the third inner arc surface is R3. The invention has better radial shock resistance, is more beneficial to reducing the power consumption of the elliptical bearing, and ensures that the elliptical bearing keeps a lower temperature state in the high-speed operation of the journal.

Description

Elliptic bearing for gas turbine
Technical Field
The invention relates to the technical field of gas turbines, in particular to an elliptical bearing for a 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 in a fixed shaft and bearing static and action force of the rotor. The radial bearing lifts the journal through the oil wedge at the bottom of the bearing, forms liquid friction between the journal and the bearing, and bears the radial force of the rotor.
With the continuous improvement of the capacity of the gas turbine generator set, the size of the rotor shaft neck is continuously increased, the linear speed is increased, and the bearing running working condition is more severe. Conventional bearings cannot meet the normal operation requirement and are extremely easy to destabilize. The existing elliptic bearing comprises an upper half bearing bush and a lower half bearing bush, wherein the inner peripheral wall of the upper half bearing bush and the inner peripheral wall of the lower half bearing bush are both formed by arc surfaces, and a journal rotates and is unstable in a conventional bearing.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is to provide an elliptical bearing for a gas turbine, which has better radial shock resistance, is more advantageous to reduce power consumption of the elliptical bearing, and maintains the elliptical bearing in a lower temperature state during high-speed operation of a journal.
In order to solve the above technical problems, the present invention provides an elliptical bearing for a gas turbine, the elliptical bearing having a bearing center, the bearing center being used as a horizontal reference line and a vertical reference line, the elliptical bearing comprising:
The bearing comprises an upper half-tile, wherein the outer circumferential wall of the upper half-tile is a first outer arc surface, the circle center corresponding to the first outer arc surface coincides with the center of the bearing, the inner circumferential wall of the upper half-tile is a first inner arc surface, the distance that the circle center corresponding to the first inner arc surface is offset downwards along a vertical datum line relative to the center of the bearing is L1, and the radius corresponding to the first inner arc surface is R1;
the outer circumferential wall of the bearing lower half tile is a second outer arc surface, the circle center corresponding to the second outer arc surface coincides with the center of the bearing, the inner circumferential wall of the bearing lower half tile is of a three-section type line structure, the three-section type line structure comprises the 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 circle center angle corresponding to the second inner arc surface is alpha, the distance that the circle center corresponding to the third inner arc surface is offset upwards relative to the center of the bearing along a vertical datum line is L2, and the radius corresponding to the third inner arc surface is R3;
The oil groove structure is arranged at the middle parting surface of the bearing upper half tile and the bearing lower half tile, the oil groove structure comprises an upper half oil groove arranged on the bearing upper half tile and a lower half oil groove arranged on the bearing lower half tile, 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 along a vertical datum line relative to the center of the bearing, is L3, the radius corresponding to the fourth inner arc surface is R4, the circle center angle corresponding to the fourth inner arc surface, which is offset upwards along the vertical datum line relative 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 along the vertical datum line relative to the center of the bearing, 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 delta;
R2<R1=R3,R4>R5,δ≤α≤180°-δ,L3>L1>L2,L3>L4>L2。
preferably, said central angle δ > said central angle β.
As described above, the elliptical bearing for a gas turbine according to the present invention has the advantage that the outer peripheral wall of the upper half of the bearing and the outer peripheral wall of the lower half of the bearing are unchanged from those of the conventional elliptical bearing. Compared with the existing elliptical bearing, the bearing has the advantages that the inner peripheral wall of the upper half-bush of the bearing and the inner peripheral wall of the lower half-bush of the bearing are optimally designed, the circle center corresponding to the first inner circular arc surface is offset downwards along a vertical datum line relative to the center of the bearing by a distance L1, the radius corresponding to the first inner circular arc surface is R1, the inner peripheral wall of the lower half-bush of the bearing is of a three-section type line structure, the three-section type line structure comprises a second inner circular arc surface and third inner circular arc surfaces symmetrically distributed on two sides of the second inner circular arc surface, the circle center corresponding to the second inner circular arc surface coincides with the center of the bearing, the radius corresponding to the second inner circular arc surface is R2, the circle center angle corresponding to the second inner circular arc surface is alpha, the circle center corresponding to the third inner circular arc surface is offset upwards along the vertical datum line relative to the center of the bearing by a distance L2, the radius corresponding to the third inner circular arc surface is R3, R2 is less than R1=R3, and L1 is greater than L2. In addition, the oil groove structure is arranged at the bisection surface of the upper half bearing bush and the lower half bearing bush, the oil groove structure comprises an upper half oil groove arranged on the upper half bearing bush and a lower half oil groove arranged on the lower half bearing bush, 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 along a vertical datum line relative to the center of the bearing, is L3, the radius corresponding to the fourth inner arc surface is R4, the circle center corresponding to the fourth inner arc surface, which is beta, is a fifth inner arc surface, the distance of the circle center corresponding to the fifth inner arc surface, which is offset upwards along the vertical datum line relative to the center of the bearing, is L4, the radius corresponding to the fifth inner arc surface is R5, the circle center angle corresponding to the center of the fifth inner arc surface is delta, R4> R5, L3> L1, L3> L2, the oil inlet section of the lower half oil groove is larger than the oil inlet section of the upper half bearing, more turbine oil enters the lower half bearing bush, the heat dissipation efficiency of the lower half bearing is improved, the heat dissipation effect of the lower half bearing is better, the bearing is kept in an elliptical bearing, and the bearing is more favorable for keeping the lower bearing running state.
Drawings
Fig. 1 is a schematic view of an elliptical bearing for a gas turbine according to the present invention.
Description of element reference numerals
1. Bearing center
2. Horizontal datum line
3. Vertical datum 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
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for the purpose of understanding and reading the disclosure, and are not intended to limit the scope of the invention, which is defined by the appended claims, but rather by the claims, unless otherwise indicated, and unless otherwise indicated, all changes in structure, proportions, or otherwise, used by those skilled in the art, are included in the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
As shown in fig. 1, the present invention provides an elliptical bearing for a gas turbine, the elliptical bearing having a bearing center 1, a horizontal reference line 2 and a vertical reference line 3 passing through the bearing center 1, the elliptical bearing comprising:
The bearing upper half tile 4, the outer peripheral wall of the bearing upper half tile 4 is a first outer arc surface 41, the circle center corresponding to the first outer arc surface 41 coincides with the bearing center 1, the inner peripheral wall of the bearing upper half tile 4 is a first inner arc surface 42, the distance that the circle center corresponding to the first inner arc surface 42 is offset downwards relative to the bearing center 1 along the vertical datum line 3 is L1, and the radius corresponding to the first inner arc surface 42 is R1;
The outer circumferential 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 coincides with the bearing center 1, the inner circumferential 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 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 that the circle center corresponding to the third inner arc surface 53 is offset upwards relative to the bearing center 1 along a vertical datum line 3 is L2, and the radius corresponding to the third inner arc surface 53 is R3;
The oil groove structure 6 is arranged at the bisection surface of the bearing upper half tile 4 and the bearing lower half tile 5, the oil groove structure 6 comprises an upper half oil groove arranged on the bearing upper half tile 4 and a lower half oil groove arranged on the bearing lower half tile 5, the upper half oil groove is a fourth inner arc surface 61, the circle center corresponding to the fourth inner arc surface 61 is offset downwards along a vertical datum line 3 by a distance L3 relative to the bearing center 1, the radius corresponding to the fourth inner arc surface 61 is R4, the circle center angle corresponding to the fourth inner arc surface 61 is beta relative to the bearing center 1, the lower half oil groove is a fifth inner arc surface 62, the circle center corresponding to the fifth inner arc surface 62 is offset upwards along the vertical datum line 3 relative to the bearing center 1 by a distance L4, the radius corresponding to the fifth inner arc surface 62 is R5, and the circle center angle corresponding to the fifth inner arc surface 62 is delta relative to the bearing center 1;
R2<R1=R3,R4>R5,δ≤α≤180°-δ,L3>L1>L2,L3>L4>L2。
In the invention, compared with the existing elliptical bearing, the outer peripheral wall of the bearing upper half tile 4 and the outer peripheral wall of the bearing lower half tile 5 are unchanged, namely, the outer peripheral wall of the bearing upper half tile 4 is a first outer arc surface 41, the circle center corresponding to the first outer arc surface 41 coincides with the bearing center 1, the outer peripheral wall of the bearing lower half tile 5 is a second outer arc surface 51, and the circle center corresponding to the second outer arc surface 51 coincides with the bearing center 1. Compared with the existing elliptical bearing, the inner peripheral wall of the bearing upper half-shoe 4 and the inner peripheral wall of the bearing lower half-shoe 5 are optimally designed such that the center of the circle corresponding to the first inner circular arc surface 42 is offset downwards along the vertical datum line 3 by a distance L1 relative to the bearing center 1, the radius corresponding to the first inner circular arc surface 42 is R1, the inner peripheral wall of the bearing lower half-shoe 5 is of a three-section type line structure, the three-section type line structure comprises a second inner circular arc surface 52 and third inner circular arc surfaces 53 symmetrically distributed on two sides of the second inner circular arc surface 52, the center of the circle corresponding to the second inner circular arc surface 52 coincides with the bearing center 1, the radius corresponding to the second inner circular arc surface 52 is R2, the center of the circle corresponding to the third inner circular arc surface 53 is offset upwards along the vertical datum line 3 by a distance L2 relative to the bearing center 1, the radius corresponding to the third inner circular arc surface 53 is R3, R2 is less than R1=R3, L1> L2, the thickness of the top of the bearing upper half-shoe 4 is thicker than that of the existing elliptical bearing, the bottom of the bearing lower half-shoe 5 is more easily compressed, that is more firmly, namely, the bearing half-shoe 5 is more easily rotated in a radial direction than the bearing half-shoe is more stably, and the bearing is more easily rotated in the bearing half-drum is more stable, and has a radial bearing is more stable, and is more easily rotated in the bearing than the bearing.
In addition, the oil groove structure 6 is arranged at the bisection surface of the bearing upper half tile 4 and the bearing lower half tile 5, the oil groove structure 6 comprises an upper half oil groove arranged on the bearing upper half tile 4 and a lower half oil groove arranged on the bearing lower half tile 5, the upper half oil groove is a fourth inner arc surface 61, the distance of the circle center corresponding to the fourth inner arc surface 61 which is downwards offset along the vertical datum line 3 relative to the bearing center 1 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 relative to the bearing center 1 is beta, the lower half oil groove is a fifth inner arc surface 62, the distance of the circle center corresponding to the fifth inner arc surface 62 which is upwards offset along the vertical datum line 3 relative to the bearing center 1 is L4, the radius corresponding to the fifth inner arc surface 62 is R5, the central angle corresponding to the fifth inner arc surface 62 relative to the bearing center 1 is delta, R4> R5, L3> L1, L3> L4> L2, and the design is such that the oil inlet section of the lower half oil groove is larger than the oil inlet section of the upper half oil groove, so that more turbine oil (i.e. turbine oil, which generally has high temperature resistance and wear resistance) enters the lower half bearing 5, the heat dissipation efficiency and lubrication effect of the lower half bearing 5 are improved, the power consumption of the elliptical bearing is reduced, and the elliptical bearing keeps a lower temperature state in the high-speed operation of the journal.
The central angle delta > the central angle beta.
In summary, the elliptical bearing for the gas turbine has better radial shock resistance, is more beneficial to reducing the power consumption of the elliptical bearing, and ensures that the elliptical bearing keeps a lower temperature state in the high-speed operation of the journal. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (2)

1. An elliptical bearing for a gas turbine, the elliptical bearing having a bearing center (1), a horizontal datum line (2) and a vertical datum line (3) passing through the bearing center (1), the elliptical bearing comprising:
The bearing comprises an upper half-bush (4), wherein the outer circumferential wall of the upper half-bush (4) is a first outer arc surface (41), the circle center corresponding to the first outer arc surface (41) coincides with a bearing center (1), the inner circumferential wall of the upper half-bush (4) is a first inner arc surface (42), the circle center corresponding to the first inner arc surface (42) is offset downwards along a vertical datum 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 bearing comprises a bearing lower half-shoe (5), wherein the outer circumferential wall of the bearing lower half-shoe (5) is a second outer circular arc surface (51), the circle center corresponding to the second outer circular arc surface (51) coincides with a bearing center (1), the inner circumferential wall of the bearing lower half-shoe (5) is of a three-section type line structure, the three-section type line structure comprises a second inner circular arc surface (52) and third inner circular arc surfaces (53) symmetrically distributed on two sides of the second inner circular arc surface (52), the circle center corresponding to the second inner circular arc surface (52) coincides with the bearing center (1), the radius corresponding to the second inner circular arc surface (52) is R2, the circle center angle corresponding to the second inner circular arc surface (52) is alpha, the distance that the circle center corresponding to the third inner circular arc surface (53) is offset upwards relative to the bearing center (1) along a vertical datum line (3), and the radius corresponding to the third inner circular arc surface (53) is R3;
The oil groove structure (6) is arranged at the middle parting surface of the bearing upper half tile (4) and the bearing lower half tile (5), the oil groove structure (6) comprises an upper half oil groove arranged on the bearing upper half tile (4) and a lower half oil groove arranged on the bearing lower half tile (5), the upper half oil groove is a fourth inner arc surface (61), the distance of a circle center corresponding to the fourth inner arc surface (61) which is offset downwards relative to the bearing center (1) 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) is beta, the circle center corresponding to the bearing center (1) is a fifth inner arc surface (62), the distance of a circle center corresponding to the fifth inner arc surface (62) which is offset upwards relative to the bearing center (1) along the vertical datum line (3) is L4, the radius corresponding to the fifth inner arc surface (62) is R5), and the circle center angle corresponding to the bearing center (1) is delta;
R2<R1=R3,R4>R5,δ≤α≤180°-δ,L3>L1>L2,L3>L4>L2。
2. the elliptical bearing for a gas turbine according to claim 1, wherein said central angle δ > said central angle β.
CN202010035565.9A 2020-01-14 2020-01-14 Elliptic bearing for gas turbine Active CN111140594B (en)

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CN111140594B true CN111140594B (en) 2025-04-08

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DE102020212572A1 (en) * 2020-10-06 2022-04-07 Zf Friedrichshafen Ag Non-circular sliding surface

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CN103075425A (en) * 2012-08-27 2013-05-01 浙江富春江水电设备股份有限公司 Radial sliding bearing
CN102817906A (en) * 2012-08-31 2012-12-12 上海交大南洋机电科技有限公司 Elliptical bearing applied to transmission device of speed-regulating hydraulic coupler
CN103557232B (en) * 2013-10-22 2015-09-09 申科滑动轴承股份有限公司 A kind of improve water lubriucated bearing bearing capacity method and corresponding water lubriucated bearing
CN105041874B (en) * 2015-07-13 2017-06-23 青岛泰德汽车轴承股份有限公司 Retainer
JP6165827B2 (en) * 2015-11-27 2017-07-19 大同メタル工業株式会社 Crankshaft bearing device for internal combustion engine
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Publication number Priority date Publication date Assignee Title
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