Built-in generator installation structure of double-rotor turbofan engine

Abstract

The invention belongs to the technical field of structural design of double-rotor turbofan engines, and particularly relates to a built-in generator mounting structure of a double-rotor turbofan engine. Therefore, the generator can be reliably connected and fixed in the engine.

Description

Technical Field

[0001] The present application belongs to the technical field of twin-rotor turbofan engine structural design, and specifically relates to a twin-rotor turbofan engine built-in generator installation structure. Background Art

[0002] The starter-generator is the core component of an aviation multi-electric engine. It is integrated on the main shaft of an aviation engine and can extract power from the main shaft to meet the power requirements of the engine's electrical accessories and onboard electronic equipment. At the same time, the installation of the starter-generator does not require the setting of central transmission, accessory casing and other mechanical hydraulic structures, which can effectively reduce the engine weight and improve engine performance.

[0003] Currently, the generator is usually installed on the engine using a coupling or a reducer, or connected to the engine using a center tie rod and a locking nut.

[0004] The starter-generator is installed on the engine using a coupling or a reducer. Due to the non-hollow structure of the coupling or the reducer, it can only be connected in series in front of or behind the engine. It is only suitable for single-rotor engines, core engines, or the low-pressure rotor of a twin-rotor engine, and cannot be used on a twin-rotor turbofan engine.

[0005] The starter-generator is installed on the engine using a center pull rod and a locking nut, which is only suitable for turboshaft engines with relatively small size and simple structure. It is difficult to apply to twin-rotor turbofan engines with larger size and complex structure. Twin-rotor turbofan engines have more space constraints and complex working conditions such as impact and vibration. If the starter-generator is installed using a center pull rod and a locking nut, the internal structure of the twin-rotor turbofan engine needs to be modified to a large extent, and there will be a great risk of vibration.

[0006] This application is proposed in view of the above-mentioned technical defects. Summary of the invention

[0007] The purpose of the present application is to provide a built-in generator installation structure for a twin-rotor turbofan engine to overcome or alleviate at least one of the known technical defects.

[0008] The technical solution of this application is: A twin-rotor turbofan engine built-in generator installation structure, comprising a mounting sleeve, a mounting plate, and a generator; The mounting sleeve is sleeved on the front end of the integrated compressor disc shaft of the twin-rotor turbofan engine and is matched with the integrated compressor disc shaft through a spline; A first locking nut is threadedly connected to the front end of the integrated compressor disc shaft, and the first locking nut is pressed against the front end of the mounting sleeve; The mounting plate is arranged in the intermediate casing of the twin-rotor turbofan engine, and its outer edge is connected to the inner side of the intermediate casing; a first roller bearing is installed in the mounting plate, and the first roller bearing is sleeved on the mounting shaft sleeve; A second locking nut is threadedly connected to the mounting sleeve, and the second locking nut cooperates with a first stop boss formed on the mounting sleeve to clamp the first roller bearing in the axial direction; The generator is arranged in the intermediate casing, and includes a motor shaft, a motor rotor, a motor stator, and a motor housing; The motor shaft sleeve is arranged on the outer periphery of the mounting sleeve and is matched with the mounting sleeve through a spline; The motor rotor is sleeved on the outer periphery of the motor shaft, the motor stator is sleeved on the outer periphery of the motor rotor, and the motor housing is sleeved on the outer periphery of the motor stator; The front end of the motor housing is connected to a first folding elastic support structure, a second roller bearing is installed in the first folding elastic support structure, and the second roller bearing is sleeved on the motor shaft; A third locking nut is threadedly connected to the front end of the motor shaft, and the third locking nut cooperates with a second stop boss formed on the motor shaft to clamp the second roller bearing in the axial direction; A mounting edge is formed on the motor housing, and an outer edge of the mounting edge is connected to the inner side of the intermediate casing; A fourth locking nut is threadedly connected to the front end of the integrated compressor disc shaft, the fourth locking nut is pressed on the first locking nut, and is threadedly connected to the front end of the motor shaft.

[0009] Optionally, in the above-mentioned twin-rotor turbofan engine built-in generator installation structure, both ends of the installation sleeve are in cooperative contact with the cylindrical surface between the shafts of the integrated compressor disk; The front end of the motor shaft is in cylindrical contact with the mounting sleeve.

[0010] Optionally, in the above-mentioned dual-rotor turbofan engine built-in generator installation structure, the first locking nut is in conical contact with the front end of the installation sleeve; The fourth locking nut is in conical contact with the first locking nut.

[0011] Optionally, in the above-mentioned dual-rotor turbofan engine built-in generator installation structure, the outer edge of the installation plate is connected to the first installation boss provided in the intermediate casing by bolts, and cooperates with the stopper between the first installation boss; The front end of the motor housing is connected to the first folding elastic support structure by bolts, and is matched with the stopper between the first folding elastic support structure; The outer edge of the mounting edge is connected to the second mounting boss arranged in the intermediate casing through bolts, and is matched with the stopper between the second mounting boss.

[0012] Optionally, the above-mentioned dual-rotor turbofan engine built-in generator installation structure further includes a rotor support structure; The rotor support structure is arranged in the intermediate casing, connected to the inner side of the intermediate casing, and located behind the mounting plate; The rotor support structure is provided with two folding elastic support structures, and the two folding elastic support structures are respectively installed with a ball bearing and a third roller bearing; The ball bearing and the third roller bearing are sleeved on the mounting sleeve, wherein the ball bearing is located in front of the third roller bearing.

[0013] Optionally, in the above-mentioned dual-rotor turbofan engine built-in generator mounting structure, the rotor support structure is connected to the third mounting boss provided in the intermediate casing by bolts, and cooperates with the stopper between the third mounting boss.

[0014] Optionally, in the above-mentioned twin-rotor turbofan engine built-in generator installation structure, a first distance sleeve is sleeved on the installation sleeve; The first distance sleeve is located between the ball bearing and the third roller bearing.

[0015] Optionally, in the above-mentioned twin-rotor turbofan engine built-in generator installation structure, a second distance sleeve and an adjustment washer are sleeved on the installation sleeve; The adjusting washer is located between the second distance sleeve and the third stop boss formed on the mounting sleeve, and the second distance sleeve is pressed tightly against the fourth stop boss formed on the mounting sleeve and the third roller bearing.

[0016] This application has at least the following beneficial technical effects: Provided is a built-in starter-generator installation structure for a twin-rotor turbofan engine, which only requires a minor degree of modification of the intermediate casing and its integrated compressor disc shaft on the twin-rotor turbofan engine to achieve reliable connection and fixation of the starter-generator in the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the internal starter-generator installation structure of a twin-rotor turbofan engine provided in an embodiment of the present application; Figure 2 is a detailed view of the internal starter-generator installation structure of a twin-rotor turbofan engine provided by an embodiment of the present application; in: 1-installing sleeve; 2-installing plate; 3-generator; 4-first locking nut; 5-first roller bearing; 6-second locking nut; 7-motor shaft; 8-motor rotor; 9-motor stator; 10-motor housing; 11-first folding elastic support structure; 12-second roller bearing; 13-third locking nut; 14-installing edge; 15-fourth locking nut; 16-rotor support structure; 17-ball bearing; 18-third roller bearing; 19-first distance sleeve; 20-second distance sleeve; 21-adjusting washer; 22-intermediate casing; 23-integrated compressor disc shaft.

[0018] In order to better illustrate the present embodiment, some contents of the drawings may be omitted, enlarged or reduced, which is only used for illustrative purposes and should not be construed as limiting the present application. DETAILED DESCRIPTION

[0019] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0020] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application should be the common meanings understood by those skilled in the art in the field to which this application belongs. The term "include" used in the description of this application means that the concepts appearing before the term include the concepts listed after the term and their equivalents, without excluding other related concepts.

[0021] In addition, the words indicating orientation used in the description of this application are only used to indicate relative directions or positional relationships. When the absolute position of the object being described changes, its relative positional relationship may also change accordingly. It should also be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and other similar words used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0022] A twin-rotor turbofan engine built-in generator installation structure, such as Figure 1 As shown, it includes a mounting sleeve 1, a mounting plate 2, and a generator 3.

[0023] The mounting sleeve 1 is sleeved on the front end of the integrated compressor disc shaft 23 of the twin-rotor turbofan engine, and is circumferentially positioned with the integrated compressor disc shaft 23 through spline cooperation.

[0024] The two ends of the installation sleeve 1 are in contact with the cylindrical surfaces of the integrated compressor disc shaft 23 for centering.

[0025] The front end of the integrated compressor disc shaft 23 is threaded with a first locking nut 4, which is pressed against the front end of the mounting sleeve 1 to axially position the mounting sleeve 1 and is in contact with the conical surface of the front end of the mounting sleeve 1 for rapid centering.

[0026] The mounting plate 2 is disposed in the intermediate casing 22 of the twin-rotor turbofan engine, and its outer edge is connected to the inner side of the intermediate casing 22. Specifically, it can be connected to the first mounting boss disposed in the intermediate casing 22 by bolts and cooperate with the stopper between the first mounting boss.

[0027] A first roller bearing 5 is installed in the installation disk 2 , and the first roller bearing 5 is sleeved on the installation sleeve 1 .

[0028] A second locking nut 6 is threadedly connected to the mounting sleeve 1 , and the second locking nut 6 cooperates with a first stop boss formed on the mounting sleeve 1 to axially clamp the first roller bearing 5 to axially position the first roller bearing 5 .

[0029] The generator 3 is arranged in the intermediate casing 22, and includes a motor shaft 7, a motor rotor 8, a motor stator 9, and a motor housing 10. Figure 2 shown.

[0030] The motor shaft 7 is sleeved on the outer circumference of the mounting sleeve 1 and is circumferentially positioned by spline fit with the mounting sleeve 1. The front end of the motor shaft 7 is in cylindrical contact with the mounting sleeve 1 for centering.

[0031] The motor rotor 8 is sleeved on the outer circumference of the motor shaft 7 , the motor stator 9 is sleeved on the outer circumference of the motor rotor 8 , and the motor housing 10 is sleeved on the outer circumference of the motor stator 9 .

[0032] The front end of the motor housing 10 is connected to a first folding elastic support structure 11. Specifically, the front end of the motor housing 10 can be connected to the first folding elastic support structure 11 by bolts and cooperate with the stopper between the first folding elastic support structure 11. A second roller bearing 12 is installed in the first folding elastic support structure 11, and the second roller bearing 12 is sleeved on the motor shaft 7.

[0033] In order to facilitate assembly, the first folding elastic support structure 11 may be designed with a detailed structure. For example, the first folding elastic support structure 11 may be designed to be composed of a plurality of bolt-connected structures.

[0034] A third locking nut 13 is screwed onto the front end of the motor shaft 7 , and the third locking nut 13 cooperates with a second stop boss formed on the motor shaft 7 to axially clamp the second roller bearing 12 and axially position the second roller bearing 12 .

[0035] The motor housing 10 is formed with a mounting edge 14, the outer edge of which is connected to the inner side of the intermediate casing 22. The outer edge of the mounting edge 14 can be connected to a second mounting boss provided in the intermediate casing 22 by bolts and cooperates with the stopper between the second mounting bosses.

[0036] A fourth locking nut 15 is screwed to the front end of the integrated compressor disk shaft 23. The fourth locking nut 15 is pressed against the first locking nut 4 and is screwed to the front end of the motor shaft 7 to axially position the motor shaft 7, that is, to axially position the generator 3. The conical surface between the fourth locking nut 15 and the first locking nut 4 is in contact with each other for rapid centering, which helps to maintain the coaxiality between the motor shaft 7, the mounting sleeve 1 and the integrated compressor disk shaft 23.

[0037] The cables on the generator 3 are led out through the lead-in holes provided on the intermediate casing 22 .

[0038] A rotor support structure 16 is further provided in the intermediate casing 22. The rotor support structure 16 is located behind the mounting plate 2 and is connected to the inner side of the intermediate casing 22. Specifically, the rotor support structure 16 can be connected to a third mounting boss provided in the intermediate casing 22 by bolts and cooperate with the stopper between the third mounting bosses.

[0039] The rotor support structure 16 has two folding elastic support structures, on which a ball bearing 17 and a third roller bearing 18 are respectively installed. The ball bearing 17 and the third roller bearing 18 are sleeved on the mounting sleeve 1, wherein the ball bearing 17 is located in front of the third roller bearing 18.

[0040] The rotor support structure 16 supports the high-pressure rotor of the twin-rotor turbofan engine through ball bearings 17 and third roller bearings 18, wherein the ball bearings 17 are mainly used to bear the axial force generated by the engine, while the third roller bearings 18, together with the first roller bearings 5 ​​and the second roller bearings 12, bear the radial loads generated by the engine and the generator 3. The first roller bearing 5 is both a support structure for the motor shaft 7 of the generator 3 and an auxiliary support for the rotor support structure 16.

[0041] A first distance sleeve 19 is sleeved on the mounting sleeve 1 , and the first distance sleeve 19 is located between the ball bearing 17 and the third roller bearing 18 .

[0042] The mounting sleeve 1 is provided with a second distance sleeve 20 and an adjusting washer 21, and the adjusting washer 21 is located between the second distance sleeve 20 and the third stop boss formed on the mounting sleeve 1, and the second distance sleeve 20 is pressed against the fourth stop boss formed on the mounting sleeve 1 and the third roller bearing 18. The adjusting washer 21 can be used to adjust the axial distance between the high-pressure rotor and the stator of the twin-rotor turbofan engine to meet the working requirements.

[0043] In the built-in generator installation structure of the twin-rotor turbofan engine disclosed in the above embodiment, the generator 3 is designed to be arranged in the cavity of the intermediate casing 22 of the twin-rotor turbofan engine, and the generator 3 is connected and fixed to the intermediate casing 22 by bolts using the mounting edge 14 formed on the motor housing 10, and the axial positioning of the motor shaft 7 on the mounting sleeve 1 is achieved by the fourth locking nut 15, the motor shaft 7 is centered by the cylindrical surface, and the circumferential positioning is achieved by the spline structure, the mounting sleeve 1 is circumferentially positioned on the integrated compressor disc shaft 23 by splines, and the axial positioning is achieved by the first locking nut 4, so as to achieve reliable connection and fixation of the generator 3 on the integrated compressor disc shaft 23 of the twin-rotor turbofan engine.

[0044] A first folding elastic support structure 11 and a second roller bearing 12 are arranged at the front end of the generator 3, and a mounting plate 2 and a first roller bearing 5 are arranged at the rear, which cooperate with the two folding elastic support structures and their ball bearings 17 and the third roller bearing 18 on the rotor support structure 16 to support the high-pressure rotor of the dual-rotor turbofan engine.

[0045] The first roller bearing 5, the second roller bearing 12, the ball bearing 17 and the third roller bearing 18 are reliably connected and fixed to the intermediate casing 22 of the twin-rotor turbofan engine through a mounting plate or a folding elastic support structure to transfer load, thereby ensuring the rationality of the load-bearing and force-transmission routes of the generator 3 and the engine. In addition, the combined design of the bearing fulcrum layout and the folding elastic support structure can effectively reduce the support stiffness, reduce the vibration level of the structure, and ensure that there is a reasonable margin between the operating speed of the rotor components and the critical speed.

[0046] The twin-rotor turbofan engine built-in generator installation structure disclosed in the above-mentioned embodiment only requires a relatively small degree of modification of the intermediate casing (22) and its integrated compressor disc shaft (23) on the twin-rotor turbofan engine, so as to realize reliable connection and fixation of the generator (3) in the engine. Furthermore, through the combined design of the bearing fulcrum layout and the return-type elastic support structure, the vibration risk of the rotor components can be effectively reduced, so that there is a reasonable margin between the operating speed and the critical speed.

[0047] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A twin-rotor turbofan engine built-in generator installation structure, characterized in that: It comprises a mounting sleeve (1), a mounting plate (2), and a generator (3); The mounting sleeve (1) is sleeved on the front end of an integrated compressor disc shaft (23) of a twin-rotor turbofan engine and is engaged with the integrated compressor disc shaft (23) via a spline; A first locking nut (4) is threadedly connected to the front end of the integrated compressor disc shaft (23), and the first locking nut (4) is pressed against the front end of the mounting sleeve (1); The mounting plate (2) is arranged in an intermediate casing (22) of the twin-rotor turbofan engine, and its outer edge is connected to the inner side of the intermediate casing (22); a first roller bearing (5) is installed in the mounting plate (2), and the first roller bearing (5) is sleeved on the mounting shaft sleeve (1); A second locking nut (6) is threadedly connected to the mounting sleeve (1), and the second locking nut (6) cooperates with a first stop boss formed on the mounting sleeve (1) to clamp the first roller bearing (5) in the axial direction; The generator (3) is arranged in the intermediate casing (22), and comprises a motor shaft (7), a motor rotor (8), a motor stator (9), and a motor housing (10); The motor shaft (7) is sleeved on the outer circumference of the mounting sleeve (1) and is engaged with the mounting sleeve (1) via a spline; The motor rotor (8) is sleeved on the outer circumference of the motor shaft (7), the motor stator (9) is sleeved on the outer circumference of the motor rotor (8), and the motor housing (10) is sleeved on the outer circumference of the motor stator (9); A first folding elastic support structure (11) is connected to the front end of the motor housing (10); a second roller bearing (12) is installed in the first folding elastic support structure (11); and the second roller bearing (12) is sleeved on the motor shaft (7); A third locking nut (13) is threadedly connected to the front end of the motor shaft (7), and the third locking nut (13) cooperates with a second stop boss formed on the motor shaft (7) to clamp the second roller bearing (12) in the axial direction; A mounting edge (14) is formed on the motor housing (10), and the outer edge of the mounting edge (14) is connected to the inner side of the intermediate casing (22); A fourth locking nut (15) is threadedly connected to the front end of the integrated compressor disc shaft (23); the fourth locking nut (15) is pressed against the first locking nut (4) and is threadedly connected to the front end of the motor shaft (7).

2. The twin-rotor turbofan engine built-in generator installation structure according to claim 1, characterized in that: The two ends of the mounting sleeve (1) are in contact with the cylindrical surfaces of the integrated compressor disc shaft (23); The front end of the motor shaft (7) and the mounting sleeve (1) are in cylindrical contact with each other.

3. The twin-rotor turbofan engine built-in generator installation structure according to claim 2, characterized in that: The first locking nut (4) is in conical contact with the front end of the mounting sleeve (1); The fourth locking nut (15) and the first locking nut (4) are in conical contact with each other.

4. The twin-rotor turbofan engine built-in generator installation structure according to claim 3, characterized in that: The outer edge of the mounting plate (2) is connected to a first mounting boss provided in the intermediate casing (22) by means of bolts, and is engaged with a stopper between the first mounting boss; The front end of the motor housing (10) is connected to the first folding elastic support structure (11) by means of bolts, and the stopper is matched with the first folding elastic support structure (11); The outer edge of the mounting edge (14) is connected to a second mounting boss arranged in the intermediate casing (22) by means of bolts, and is matched with a stopper between the second mounting boss.

5. The twin-rotor turbofan engine built-in generator installation structure according to claim 4, characterized in that: Also included is a rotor support structure (16); The rotor support structure (16) is arranged in the intermediate casing (22), connected to the inner side of the intermediate casing (22), and located behind the mounting plate (2); The rotor support structure (16) is provided with two folding elastic support structures, and the two folding elastic support structures are respectively installed with a ball bearing (17) and a third roller bearing (18); The ball bearing (17) and the third roller bearing (18) are sleeved on the mounting sleeve (1), wherein the ball bearing (17) is located in front of the third roller bearing (18).

6. The twin-rotor turbofan engine built-in generator installation structure according to claim 5, characterized in that: The rotor support structure (16) is connected to a third mounting boss arranged in the intermediate casing (22) by means of bolts, and is matched with a stopper between the third mounting boss.

7. The twin-rotor turbofan engine built-in generator installation structure according to claim 6, characterized in that: A first distance sleeve (19) is sleeved on the mounting sleeve (1); The first distance sleeve (19) is located between the ball bearing (17) and the third roller bearing (18).

8. The twin-rotor turbofan engine built-in generator installation structure according to claim 7, characterized in that: A second distance sleeve (20) and an adjusting washer (21) are provided on the mounting sleeve (1); The adjusting washer (21) is located between the second distance sleeve (20) and a third stop boss formed on the mounting sleeve (1), and the second distance sleeve (20) is pressed tightly against the fourth stop boss formed on the mounting sleeve (1) and the third roller bearing (18).

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