CN-121976974-A - Adjustable stator blade structure and aeroengine

CN121976974ACN 121976974 ACN121976974 ACN 121976974ACN-121976974-A

Abstract

The invention provides an adjustable stator blade structure and an aeroengine, the adjustable stator blade structure comprises a casing, a stator blade and a rolling connection structure. The stator blade is provided with a rotating shaft and a blade main body which are fixedly connected with each other, the rotating shaft is rotatably arranged in the mounting hole, so that the stator blade is rotatably connected with the casing, and the angle of the stator blade relative to the casing is adjustable. The rolling connection structure comprises an inner bushing, an outer bushing and balls, wherein the outer bushing is installed in the installation hole in an interference manner, the inner bushing is installed outside the rotating shaft, the balls are located between the outer bushing and the inner pillowcase, so that sliding friction between the rotating shaft and the rotating shaft is converted into rolling friction between the inner bushing and the outer bushing through the balls when the rotating shaft rotates relative to the housing, abrasion between the inner bushing and the outer bushing can be reduced when the stator blade rotates, and the rotor blade can still guarantee good execution precision and safe operation under the condition of long-time operation.

Inventors

WANG JINXI
GUO SHAOCHANG
LIU XIAOLI
CAO CHUANJUN

Assignees

中国航发商用航空发动机有限责任公司

Dates

Publication Date: 20260505
Application Date: 20241030

Claims (12)

1. An adjustable stator vane structure, characterized in that the adjustable stator vane structure comprises: The device comprises a casing, wherein a mounting hole is formed in the casing; A stator blade having a rotation shaft fixedly connected with the blade body and a blade body rotatably installed in the installation hole so as to be rotatably connected with the casing, and The rolling connection structure comprises an inner bushing, an outer bushing and balls, wherein the outer bushing is installed in the installation hole in an interference mode, the inner bushing is installed outside the rotating shaft, and the balls are located between the outer bushing and the inner bushing so that the inner bushing and the outer bushing are in rolling contact through the balls.
2. The adjustable stator vane structure according to claim 1, wherein, The inner peripheral surface of the outer liner is provided with a first inner peripheral surface section and a second inner peripheral surface section, the radial dimension of the first outer peripheral surface section is larger than that of the second outer peripheral surface section, the radial dimension of the first inner peripheral surface section is larger than that of the second inner peripheral surface section, the first inner peripheral surface section is matched with the first outer peripheral surface section, and the second inner peripheral surface section is matched with the second outer peripheral surface section; The outer liner further has a first mounting groove between the first inner peripheral surface section and the second inner peripheral surface section, the balls being rollably mounted in the first mounting groove.
3. The adjustable stator vane structure according to claim 2, wherein, The outer liner is further provided with a guide groove located on the first inner peripheral surface section, the guide groove extends along the axial direction of the outer liner, one end of the guide groove forms an opening at the end of the outer liner, and the other end of the guide groove is communicated with the first mounting groove so that the balls can enter the first mounting groove.
4. An adjustable stator vane construction according to claim 3, wherein, The rolling connection structure further comprises a blocking piece which is used for being inserted into the guide groove so as to limit the ball to the first mounting groove after the ball is mounted in the first mounting groove.
5. The adjustable stator vane structure according to claim 1, wherein, The inner bushing comprises a first cylinder body and a first convex edge arranged at one axial end of the first cylinder body, the first convex edge protrudes outwards in the radial direction of the first cylinder body, a first groove is formed in one end, close to the first cylinder body, of the first convex edge, the outer bushing comprises a second cylinder body and a second convex edge arranged at one axial end of the second cylinder body, the second convex edge protrudes outwards in the radial direction of the second cylinder body, a second groove is formed in one end, away from the second cylinder body, of the second convex edge, the first groove and the second groove are spliced to form a second mounting groove, and the balls are installed in the second mounting groove in a rolling mode.
6. The adjustable stator vane structure according to claim 5, wherein, The first convex edge is close to one end of the first barrel body and is further provided with a clamping groove, the first groove is formed in the bottom of the clamping groove, and at least part of the second convex edge is clamped into the clamping groove.
7. The adjustable stator vane structure according to claim 5, wherein, The rolling connection structure further comprises a sealing element, wherein the sealing element is arranged between the first convex edge and the second convex edge and is positioned on the radial outer side of the second mounting groove.
8. The adjustable stator vane structure according to claim 1, wherein, The stator blade further comprises a rotating shaft disc, one end of the rotating shaft disc is fixedly connected with the blade main body, the other end of the rotating shaft disc is fixedly connected with the rotating shaft, one end, connected with the rotating shaft disc, of the blade main body is a connecting end, a concave transition curve is arranged at the position, located on one side of the rotating shaft disc, of the connecting end, the connecting end is connected with the rotating shaft disc, the concave depth of the concave transition curve is S, S is less than or equal to 9mm, the width of the concave transition curve is D, and D is less than or equal to 15mm.
9. The adjustable stator vane structure according to claim 8, wherein, The rotating shaft disc is connected to the middle of the connecting end, the connecting end is provided with a first end located at the front side of the rotating shaft disc and a second end located at the rear side of the rotating shaft disc, a molded line of the first end, which is close to the rotating shaft disc, is a concave transition curve, a molded line of the first end, which is far away from the rotating shaft disc, is a straight line extending along the axial direction of the casing, a molded line of the second end, which is close to the rotating shaft disc, is a concave transition curve, a molded line of the second end, which is far away from the rotating shaft disc, is a diagonal line, and a gap between the diagonal line and the casing is gradually increased along the direction away from the rotating shaft disc.
10. The adjustable stator vane structure according to claim 1, wherein, The rotation axis of the rotating shaft is positioned in front of the pneumatic resultant force point of the blade main body.
11. The adjustable stator vane structure according to claim 1, wherein, The rolling connection structure comprises a first rolling connection structure and a second rolling connection structure which are symmetrically distributed, and the first rolling connection structure and the second rolling connection structure are installed between the rotating shaft and the mounting hole.
12. An aeroengine, which is characterized in that, The aircraft engine comprising an adjustable stator vane structure according to any one of claims 1-11.

Description

Adjustable stator blade structure and aeroengine Technical Field The invention relates to the technical field of aeroengines, in particular to an adjustable stator blade structure and an aeroengine. Background The aero-engine is an important power source structure on the aircraft, and the rotating speed of a high-pressure compressor of the turbofan engine with a large bypass ratio can be changed along with the process from take-off to landing of the aircraft. In order to keep a wide stable working range and efficiency of a rotor of the high-pressure compressor at high and low rotation speeds, the front stages of stationary vanes of the high-pressure compressor are usually made into an adjustable form. The angle of the adjustable stator blade is gradually opened along with the increase of the rotating speed of the high-pressure compressor, and the angle of the adjustable stator blade is reduced along with the reduction of the rotating speed. One takeoff cycle corresponds to tens or even hundreds of rotations of the adjustable vane angle. Therefore, the long-time rotation of the adjustable stationary blade is extremely easy to cause abrasion problem in the operation process, so that the execution precision and safe operation of the adjustable stationary blade are affected, and the long-time and effective continuous operation of the rotating shaft is difficult to be structural design. Disclosure of Invention The invention aims to provide an adjustable stator blade structure which can solve the abrasion problem caused by long-time operation of the adjustable stator blade in the prior art and ensure the execution precision and safe operation of the adjustable stator blade. The invention also aims to provide an aeroengine which can solve the abrasion problem caused by long-time operation of the adjustable stator blade in the prior art and ensure the execution precision and safe operation of the adjustable stator blade. Embodiments of the present invention may be implemented by: An adjustable stator vane structure, the adjustable stator vane structure comprising: The device comprises a casing, wherein a mounting hole is formed in the casing; A stator blade having a rotation shaft fixedly connected with the blade body and a blade body rotatably installed in the installation hole so as to be rotatably connected with the casing, and The rolling connection structure comprises an inner bushing, an outer bushing and balls, wherein the outer bushing is installed in the installation hole in an interference mode, the inner bushing is installed outside the rotating shaft, and the balls are located between the outer bushing and the inner bushing so that the inner bushing and the outer bushing are in rolling contact through the balls. Optionally, the outer peripheral surface of the inner bushing is provided with a first outer peripheral surface section and a second outer peripheral surface section, the radial dimension of the first outer peripheral surface section is larger than that of the second outer peripheral surface section, the inner peripheral surface of the outer bushing is provided with a first inner peripheral surface section and a second inner peripheral surface section, the radial dimension of the first inner peripheral surface section is larger than that of the second inner peripheral surface section, the first inner peripheral surface section is matched with the first outer peripheral surface section, and the second inner peripheral surface section is matched with the second outer peripheral surface section; The outer liner further has a first mounting groove between the first inner peripheral surface section and the second inner peripheral surface section, the balls being rollably mounted in the first mounting groove. Optionally, the outer liner is further provided with a guide groove located on the first inner peripheral surface section, the guide groove extends along the axial direction of the outer liner, one end of the guide groove forms an opening at the end of the outer liner, and the other end of the guide groove is communicated with the first mounting groove so that the balls can enter the first mounting groove. Optionally, the rolling connection structure further comprises a stopper for being inserted into the guide groove to limit the ball in the first mounting groove after the ball is mounted in the first mounting groove. Optionally, the inner bushing comprises a first cylinder body and a first convex edge arranged at one axial end of the first cylinder body, the first convex edge protrudes outwards along the radial direction of the first cylinder body, a first groove is formed in one end, close to the first cylinder body, of the first convex edge, the outer bushing comprises a second cylinder body and a second convex edge arranged at one axial end of the second cylinder body, the second convex edge protrudes outwards along the radial direction of the second cylinder body, a second groove is formed