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CN-121976860-A - Interstage seal structure

CN121976860ACN 121976860 ACN121976860 ACN 121976860ACN-121976860-A

Abstract

The invention relates to the technical field of aeroengines and discloses an interstage sealing structure which comprises a first guide piece, a second guide piece and a sealing ring, wherein the second guide piece is arranged at intervals with the first guide piece, the sealing ring is arranged at the radial tops of the first guide piece and the second guide piece, the cross section of the sealing ring is of an S-shaped structure, the first end of the sealing ring is in lap joint with the first guide piece, and the second end of the sealing ring is fixedly connected with the second guide piece. In the working process of the engine, the first guide piece, the second guide piece and the sealing ring are heated and radially expand, radial heat deformation is different according to different physical properties of materials or different temperatures of parts, the first end of the sealing ring and the first guide piece are kept in a compressed state, self-adaptive sealing is achieved, and the problem of plastic deformation caused by repeated extrusion of the traditional metal sealing ring or a piston ring is avoided. The interstage sealing structure provided by the invention solves the problem that the sealing effect is affected by plastic deformation of a common metal sealing ring or piston ring in the prior art.

Inventors

  • ZENG FEI
  • YU QIANG
  • LIAO NAIBING
  • FU JING
  • DING QI
  • LI XIN

Assignees

  • 中国航发湖南动力机械研究所

Dates

Publication Date
20260505
Application Date
20260409

Claims (10)

  1. 1. An interstage seal structure, characterized by comprising: a first guide (1); a second guide (2) spaced apart from the first guide (1); the sealing ring (3) is arranged at the radial top of the first guide piece (1) and the radial top of the second guide piece (2), the cross section of the sealing ring (3) is of an S-shaped structure, the first end of the sealing ring (3) is in lap joint with the first guide piece (1), and the second end of the sealing ring (3) is fixedly connected with the second guide piece (2).
  2. 2. The interstage seal structure according to claim 1, characterized in that the first guide (1) and the second guide (2) are provided with axially extending connections to the seal ring (3); The second end of the sealing ring (3) is arranged into an annular structure which is straight along the axial direction.
  3. 3. An inter-stage sealing structure according to claim 1, wherein a radial top portion of the first guide member (1) is provided with a guide surface (4), and a side of the guide surface (4) remote from the second guide member (2) is provided as an overlap position.
  4. 4. An interstage seal as claimed in claim 3, wherein the guiding surface (4) comprises an axial straight section (5) and a circular arc section (6), the straight section (5) being radially lower than the radial top surface of the first guide (1), the circular arc section (6) connecting the straight section (5) and the radial top surface of the first guide (1).
  5. 5. An interstage seal as claimed in claim 4, wherein the straight section (5) of the guide surface (4) has a length of 5-8 mm.
  6. 6. The interstage seal structure according to claim 5, characterized in that the axial length of the seal ring (3) overlapping on the second guide (2) is 5-10 mm.
  7. 7. The interstage seal structure according to any of claims 1-6, characterized in that the seal ring (3) has a thickness of 0.5-0.8 mm.
  8. 8. The interstage seal structure according to any of claims 1-6, further comprising rotor blades (7), the radial top of the rotor blades (7) being provided with first comb teeth (8), the first guide (1) being provided with first honeycomb structures (9) cooperating with the first comb teeth (8).
  9. 9. The interstage seal structure according to claim 8, characterized in that the rotor blade (7) is provided with a second grate (10) at the radial top, the second grate (10) being arranged downstream of the first grate (8), the second guide (2) being provided with a second honeycomb structure (11) cooperating with the second grate (10).
  10. 10. The interstage seal of any of claims 1-6, wherein the temperature of the first guide (1) is higher than the temperature of the second guide (2) and the seal ring (3); The linear expansion coefficient of the first guide piece (1) is larger than or equal to the linear expansion coefficients of the second guide piece (2) and the sealing ring (3).

Description

Interstage seal structure Technical Field The invention relates to the technical field of aeroengines, in particular to an interstage sealing structure. Background The working environment of the aero-engine belongs to a high-temperature, high-pressure and high-rotation-speed three-high environment, and air at an inlet of the aero-engine is pressurized by a multi-stage compressor and then combusted by a combustion chamber to form high-temperature and high-pressure gas which drives a turbine to rotate to apply work. The area between the main runner and the outer casing is a disc cavity, a casing ring cavity, a bearing seat and the like, the temperature of the area needs to be controlled in a lower range, and a sealing structure needs to be designed at the junction position of the low-temperature area and the high-temperature area in order to prevent high-temperature and high-pressure gas of the main runner from entering the area and affecting the normal operation of the engine. In the prior art, in a mechanical sealing structure of an aeroengine, a metal piston ring and a metal sealing ring (a W-shaped ring, a C-shaped ring, a V-shaped ring and the like) are mostly adopted for sealing between stator parts. The common metal seal ring and the piston ring are applied to the engine, the common metal seal ring and the piston ring are arranged between two parts, the installation position is generally designed to be used for installing a mounting groove of a seal structure, after the installation is completed, the seal structure has a certain initial compression amount and generates rebound trend, and in the working process of the engine, the contact position of the seal structure and the parts is in a compression state by virtue of the elasticity of the seal structure, so that the sealing function is realized. However, whether the piston ring or the metal sealing ring is sealed based on elastic extrusion deformation of metal materials, in the use process, the change of the engine state or the inconsistent thermal deformation of the two parts can repeatedly extrude the sealing ring or the piston ring, so that the sealing ring or the piston ring is easy to generate plastic deformation, the original elastic performance is reduced, and the sealing effect is greatly influenced. Disclosure of Invention The invention provides an interstage sealing structure, which aims to solve the problem that a common metal sealing ring or a piston ring in the prior art is easy to generate plastic deformation to influence the sealing effect. The invention provides an interstage sealing structure which comprises a first guide piece, a second guide piece and a sealing ring, wherein the second guide piece is arranged at intervals with the first guide piece, the sealing ring is arranged at the radial tops of the first guide piece and the second guide piece, the cross section of the sealing ring is of an S-shaped structure, the first end of the sealing ring is in lap joint connection with the first guide piece, and the second end of the sealing ring is fixedly connected with the second guide piece. The sealing ring has the advantages that the sealing ring is arranged at the radial top of the first guide piece and the radial top of the second guide piece, the second end of the sealing ring is fixedly arranged on the second guide piece, the first end of the sealing ring is lapped on the first guide piece, the second guide piece and the sealing ring are heated and radially expanded in the working process of the engine, and the radial heat deformation is different mainly according to different physical properties of materials or different temperatures of parts, so that the first end of the sealing ring and the first guide piece keep a compressed state, the self-adaptive sealing according to the engine state can be realized, the problem of plastic deformation caused by repeated extrusion of the traditional metal sealing ring or a piston ring is avoided, the number of parts is not increased, the sealing ring is reliable, easy to process and convenient to assemble, the service life is long, the sealing ring and the first guide piece and the second guide piece are identical, frequent replacement or disassembly are not needed, and the use cost is low. The interstage sealing structure provided by the invention solves the problem that the sealing effect is affected by plastic deformation of a common metal sealing ring or piston ring in the prior art. In an alternative embodiment, the connection part of the first guide piece and the second guide piece and the sealing ring is provided with a connecting part extending along the axial direction, and the second end of the sealing ring is provided with an annular structure which is straight along the axial direction. The sealing ring has the beneficial effects that the annular structure with the second end axially straight is parallel to the connecting part of the second guide piece, so that the sealing ring