Turbofan engine turbine structure with built-in motor power extraction function and turbofan engine

Abstract

The invention relates to the technical field of aviation gas turbine engines, and discloses a turbofan engine turbine structure with built-in motor power extraction and a turbofan engine. The exhaust support and the low-pressure turbine rotor are coaxially mounted and rotationally connected; the engine tail cone is coaxially fixed on the exhaust support; the power extraction motor is arranged in an engine tail cone and is coaxially fixed on the exhaust support, and a rotor shaft of the power extraction motor is connected with a low-pressure turbine rotor through a transmission shaft; the inlet end of the motor lubricating oil pipeline is communicated with the lubricating oil cooling circulation system, the outlet end of the motor lubricating oil pipeline is communicated with the power extraction motor, and a cable of the power extraction motor penetrates through the motor lubricating oil pipeline. The motor is arranged in the turbine, the motor rotor is directly connected with the low-pressure turbine rotor, a complex transmission device does not need to be arranged, the structure is simpler, and the research, development and manufacturing cost is reduced. And the motor cable is inserted into the lubricating oil pipeline, and the electric wire is cooled through lubricating oil, so that the influence of high-temperature fuel gas is reduced, and reliable work of the electric wire is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation gas turbine engines, and in particular to a turbofan engine turbine structure with built-in motor power extraction and a turbofan engine. Background Art

[0002] The traditional way of extracting power from aviation gas turbine engines is to use accessory transmission devices to extract power from the high-pressure rotor shaft. As the demand for power extraction from future aircraft is increasing, the traditional way of extracting power through the high-pressure shaft is difficult to meet the growing power demand, so a way of extracting power from both the high-pressure and low-pressure rotors has been developed.

[0003] At present, the way to extract power from the low-pressure rotor continues the traditional power extraction scheme, that is, adding a transmission structure for extracting power from the low-pressure shaft, and extracting the power of the low-pressure rotor to the external motor through a gear transmission chain. However, in this way, since a set of accessory transmission devices needs to be added, the structural design is complicated and the research and processing cost is high. In addition, the motor cable is in a high-temperature gas environment, which affects the reliable operation of the wires. Summary of the invention

[0004] The present invention provides a turbofan engine turbine structure and a turbofan engine with built-in motor power extraction, so as to solve or improve the problems in the related art that when the turbofan engine extracts power through a low-pressure shaft, the structure is complex, the research and development cost is high, and the reliability of the motor wires is affected.

[0005] In a first aspect, the present invention provides a turbofan engine turbine structure with built-in motor power extraction, comprising:

[0006] Low-pressure turbine rotor;

[0007] An exhaust support is coaxially mounted on the low-pressure turbine rotor, and the exhaust support is rotatably connected to the low-pressure turbine rotor;

[0008] An engine tail cone, coaxially fixed to the exhaust support;

[0009] A power extraction motor is arranged in the tail cone of the engine, and the power extraction motor is coaxially fixed to the exhaust support, and the rotor shaft of the power extraction motor is connected to the low-pressure turbine rotor through a transmission shaft;

[0010] The motor lubricating oil pipeline is arranged to penetrate the exhaust support in a radial direction, the inlet end of the motor lubricating oil pipeline is connected to the lubricating oil cooling circulation system, the outlet end is connected to the power extraction motor, and the cable of the power extraction motor is arranged to penetrate the motor lubricating oil pipeline.

[0011] In an optional embodiment, an electro-hydraulic separation joint is provided at the inlet end of the motor lubricating oil pipeline, and the electro-hydraulic separation joint has an electrical interface and a liquid interface, the electrical interface is used for the cable to pass through, and the liquid interface is used to connect to the lubricating oil cooling circulation system.

[0012] In an optional embodiment, the transmission shaft includes a first connecting section, a second connecting section, and an inclined transition section arranged between the first connecting section and the second connecting section, the outer diameter of the first connecting section is larger than the outer diameter of the second connecting section, the first connecting section is connected to the low-pressure turbine rotor via a spline engagement, and the second connecting section is connected to the rotor shaft of the power extraction motor via a spline engagement.

[0013] In an optional embodiment, the splines on the first connecting segment and the second connecting segment are drum-shaped splines.

[0014] In an optional embodiment, the exhaust support comprises:

[0015] The first annular support, the second annular support and the third annular support are sequentially spaced from outside to inside along the radial direction of the exhaust support to form a multi-layer support structure, an outer passage is formed between the first annular support and the second annular support, an inner passage is formed between the second annular support and the third annular support, an accommodating cavity for mounting the low-pressure turbine rotor is formed inside the third annular support, the low-pressure turbine rotor is rotatably connected to the third annular support through a bearing, and the engine tail cone is connected to the third annular support, and an exhaust hole is provided at the conical tip of the engine tail cone;

[0016] A plurality of support plates are arranged along the radial direction of the exhaust support and are distributed at intervals around the circumference of the exhaust support. The support plates are connected to the first annular support, the second annular support and the third annular support.

[0017] In an optional embodiment, the support plate is a hollow structure, the hollow structure is communicated with the accommodating cavity, and the support plate is provided with a first through hole, which is respectively communicated with the outer culvert channel and the hollow structure.

[0018] In an optional embodiment, the motor lubricating oil pipeline sequentially passes through the first annular support, the second annular support and the third annular support, and the motor lubricating oil pipeline located in the inner channel and the accommodating cavity is penetrated in the support support plate;

[0019] The second annular support is provided with a second through hole, the motor oil pipeline passes through the second through hole, and there is a gap between the second through hole and the motor oil pipeline, and the gap is connected with the outer duct.

[0020] In an optional embodiment, the support plate comprises:

[0021] A load-bearing support plate, wherein a first cavity communicating with the accommodating cavity is provided inside to form the hollow structure, the load-bearing support plate is provided with the first through hole, and the load-bearing support plate is connected to the first annular support, the second annular support and the third annular support;

[0022] The flow channel support plate is arranged between the second annular support and the third annular support, and the interior of the flow channel support plate is provided with a second cavity connected with the accommodating cavity, and the load-bearing support plate and the motor lubricating oil pipeline are both penetrated in the second cavity.

[0023] In an optional implementation, it also includes:

[0024] The engine bearing lubricating oil pipeline is arranged in the support support plate along the radial direction of the exhaust support, and the engine bearing lubricating oil pipeline is used to provide cooling lubricating oil to the bearing.

[0025] In a second aspect, the present invention also provides a turbofan engine, comprising a turbofan engine turbine structure with built-in motor power extraction as described in any one of the above items.

[0026] The turbofan engine turbine structure with built-in motor power extraction provided by the present invention places the power extraction motor inside the engine tail cone, and directly connects the power extraction motor rotor shaft to the low-pressure turbine rotor through a transmission shaft, without the need to set up a complex accessory transmission device. Compared with the traditional accessory transmission power extraction solution, the structure is simpler and the R&D and manufacturing costs are reduced. The motor cable is inserted into the motor lubricating oil pipeline and led out to the outside of the engine. The lubricating oil can cool the wires, reduce the impact of high-temperature gas on the wires, and ensure the reliable operation of the wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a turbofan engine turbine structure for extracting power from a built-in motor according to an embodiment of the present invention;

[0029] Figure 2 for Figure 1 A partial schematic diagram of a turbofan engine turbine structure with built-in motor power extraction is shown;

[0030] Figure 3 for Figure 2 Middle AA section view;

[0031] Figure 4 A partial schematic diagram of a support plate according to an embodiment of the present invention;

[0032] Figure 5 is a partial schematic diagram of a second through hole according to an embodiment of the present invention;

[0033] Figure 6 is a partial schematic diagram of a transmission shaft according to an embodiment of the present invention;

[0034] Figure 7 It is a three-dimensional diagram of an exhaust support according to an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Low-pressure turbine rotor; 2. Exhaust support; 201. First annular support; 202. Second annular support; 203. Third annular support; 204. Support support plate; 2041. Load-bearing support plate; 20411. First cavity; 2042. Flow channel support plate; 20421. Second cavity; 3. Engine tail cone; 301. Conical tip; 4. Power extraction motor; 401. Rotor shaft; 402. Cable; 403. Oil inlet; 404. Oil return port; 5. Transmission shaft; 501. First connecting section; 502. First connecting section Second connecting section; 503, inclined transition section; 6, motor oil pipeline; 601, inlet end; 602, outlet end; 7, electro-hydraulic separation joint; 701, electrical interface; 702, liquid interface; 703, wire mounting seat; 704, copper terminal; 8, outer channel; 9, inner channel; 10, accommodating cavity; 11, bearing; 12, exhaust hole; 13, first through hole; 14, second through hole; 15, gap; 16, engine bearing oil pipeline; 17, adapter; 18, limit support plate; 19, third through hole. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] Combine the following Figures 1 to 7 , describing the turbofan engine turbine structure and turbofan engine with built-in motor power extraction according to an embodiment of the present invention.

[0042] According to an embodiment of the present invention, on the one hand, a turbofan engine turbine structure with built-in motor power extraction is provided, comprising a low-pressure turbine rotor 1, an exhaust support 2, an engine tail cone 3, a power extraction motor 4, and a motor lubricating oil pipeline 6. Specifically, as Figure 1As shown, the exhaust support 2 is coaxially mounted on the low-pressure turbine rotor 1, and the exhaust support 2 is rotationally connected to the low-pressure turbine rotor 1. The engine tail cone 3 is coaxially fixed on the exhaust support 2, and the power extraction motor 4 is arranged in the engine tail cone 3. Specifically, the power extraction motor 4 is a high-speed motor. The power extraction motor 4 is coaxially fixed on the exhaust support 2, for example, it can be connected through a flange stop, and the rotor shaft 401 of the power extraction motor 4 is directly connected to the low-pressure turbine rotor 1 through the transmission shaft 5.

[0043] Furthermore, the motor lubricating oil pipeline 6 is arranged to penetrate the exhaust support 2 in the radial direction, such as Figure 2 As shown, the inlet end 601 of the motor lubricating oil pipeline 6 is connected to the lubricating oil cooling circulation system, and the outlet end 602 is connected to the power extraction motor 4, and the cable 402 of the power extraction motor 4 is penetrated and arranged in the motor lubricating oil pipeline 6. Specifically, as Figure 1 and Figure 2 As shown, the power extraction motor 4 is provided with an oil inlet 403 and an oil return port 404. The inlet end 601 of the motor lubricating oil pipeline 6 is connected to the lubricating oil cooling circulation system, the outlet end 602 of the motor lubricating oil pipeline 6 is connected to the oil inlet 403, and the oil return port 404 is connected to the lubricating oil cooling circulation system. In order to facilitate the connection of the lubricating oil pipeline, the oil inlet 403 and the oil return port 404 are provided with an adapter 17.

[0044] Since the power extraction motor 4 is installed inside the engine tail cone 3, the high-temperature combustion gas of the engine flows at high speed through the surface of the motor outer shell, and the combustion gas flow temperature is in the range of 550℃~850℃. The high-temperature combustion gas flow will heat up the motor. In order to ensure the normal operation of the power extraction motor 4, it is necessary to control the internal temperature of the motor within the range of 180℃, so the motor is cooled by lubricating oil. The cooling lubricating oil flows into the oil inlet 403 through the motor lubricating oil pipeline 6 and the adapter 17, and enters the lubricating oil flow channel inside the power extraction motor 4. After circulating cooling inside the motor, it returns to the lubricating oil cooling circulation system through the return oil port 404 and the return oil pipeline below. In addition, the cable 402 of the power extraction motor 4 is placed in the motor lubricating oil pipeline 6, and is surrounded by flowing cooling lubricating oil, so that the temperature of the wire can be reduced to ensure the normal operation of the wire.

[0045] In this configuration, the power extraction motor 4 is placed inside the engine tail cone 3, and the rotor shaft 401 of the power extraction motor 4 is directly connected to the low-pressure turbine rotor 1 through the transmission shaft 5, without the need to set up a complex accessory transmission device. Compared with the traditional accessory transmission power extraction solution, the structure is more simple and compact, reducing the space occupied by the engine and reducing the R&D and manufacturing costs. The motor cable 402 is inserted into the motor lubricating oil pipeline 6 and led out to the outside of the engine. The lubricating oil can cool the wires, reduce the impact of the high-temperature gas environment on the wires, and ensure the reliable operation of the wires.

[0046] In some embodiments of the present invention, Figure 1As shown, the inlet end 601 of the motor lubricating oil pipeline 6 is provided with an electro-hydraulic separation connector 7, as shown in FIG. Figure 2 As shown, the electro-hydraulic separation connector 7 has an electrical interface 701 and a liquid interface 702. The electrical interface 701 is used for the cable 402 to pass through, and the liquid interface 702 is used to connect to the lubricating oil cooling circulation system. Specifically, the electro-hydraulic separation connector 7 is provided with a wire mounting seat 703, and the external wires and the cable 402 are fixed on the wire mounting seat 703. For example, the internal and external wires are connected by copper terminals 704, and the wiring is isolated and sealed by insulating materials. With such a configuration, the motor output line adopts the electro-hydraulic separation connector 7 to achieve the separation of the circuit and the oil circuit, avoid mutual interference and leakage that may cause system failures, improve the stability and reliability of the entire device, and facilitate installation and maintenance, improve work efficiency, and meet the application requirements of engine working conditions.

[0047] In some embodiments of the present invention, Figure 6 As shown, the transmission shaft 5 includes a first connecting section 501, a second connecting section 502, and an inclined transition section 503 arranged between the first connecting section 501 and the second connecting section 502, and the outer diameter of the first connecting section 501 is greater than the outer diameter of the second connecting section 502. The first connecting section 501 is connected to the low-pressure turbine rotor 1 through a spline meshing connection, for example, the low-pressure turbine rotor 1 is provided with a first internal spline, the first connecting section 501 is provided with a matching first external spline, and the first external spline is meshed with the first internal spline. The second connecting section 502 is connected to the rotor shaft 401 of the power extraction motor 4 through a spline meshing connection, for example, the rotor shaft 401 of the power extraction motor 4 is provided with a second internal spline, the second connecting section 502 is provided with a matching second external spline, and the second external spline is meshed with the second internal spline. In this arrangement, the drive shaft 5 is connected to the low-pressure turbine rotor 1 and the power extraction motor 4 through splines, which is convenient for installation and disassembly, has automatic centering capability and good interchangeability, and the drive shaft 5 is designed as a stepped shaft, which can achieve lightweight design on the one hand, and meet installation space requirements on the other hand, making the structural design more reasonable and the spatial layout more compact.

[0048] Furthermore, in some embodiments of the present invention, the splines on the first connecting section 501 and the second connecting section 502 are drum splines. Correspondingly, the splines on the low-pressure turbine rotor 1 and the power extraction motor 4 are also drum splines. With such a configuration, the use of drum splines has a strong ability to compensate for offsets, and can well compensate for the axial, angular and radial offsets between the axes of the two connected shafts, avoid vibration and noise problems caused by the non-concentricity of the low-pressure turbine rotor 1 and the rotor shaft 401 of the power extraction motor 4 on both sides, prevent the rotor dynamic characteristics between the low-pressure turbine rotor 1 and the rotor shaft 401 of the power extraction motor 4 from interfering with each other, adapt to high-speed working conditions, and have high working reliability.

[0049] In some embodiments of the present invention, the exhaust support 2 includes a first annular support 201, a second annular support 202, a third annular support 203 and a plurality of support plates 204. Specifically, Figure 2 and Figure 7 As shown, along the radial direction of the exhaust support 2, the first annular support 201, the second annular support 202 and the third annular support 203 are sequentially arranged from the outside to the inside, thereby forming a multi-layer support structure.

[0050] An outer duct 8 is formed between the first annular support 201 and the second annular support 202. After the air enters the turbofan engine, a part of the air directly enters the outer duct 8 under the action of the fan. The airflow temperature of the outer duct 8 generally does not exceed 150°C, and the gas temperature is relatively low. An inner duct 9 is formed between the second annular support 202 and the third annular support 203. Another part of the air enters the combustion chamber under the action of the fan and flows through the inner duct 9 after participating in combustion. The airflow temperature of the inner duct 9 is in the range of 550°C to 850°C, and the gas temperature is relatively high.

[0051] The interior of the third annular support 203 forms a receiving cavity 10 for mounting the low-pressure turbine rotor 1. Figure 2 As shown, the low-pressure turbine rotor 1 is rotatably connected to the third annular support 203 via a bearing 11. The engine tail cone 3 is connected to the third annular support 203, for example, via a flange stop, and the conical tip 301 of the engine tail cone 3 is provided with an exhaust hole 12.

[0052] like Figure 7 As shown, multiple support plates 204 are arranged along the radial direction of the exhaust support 2, and multiple support plates 204 are distributed at intervals around the circumference of the exhaust support 2. The number of support plates 204 needs to be specifically determined according to actual design requirements, and multiple support plates 204 are distributed in an annular array. The support plates 204 are connected to the first annular support 201, the second annular support 202, and the third annular support 203.

[0053] With such configuration, the exhaust support 2 adopts a multi-layer support structure, which effectively enhances the structural stability, improves the deformation resistance, optimizes the shock absorption and noise reduction effects, reduces the vibration transmission efficiency, reduces the impact of vibration on surrounding structures, and improves the reliability of the entire system.

[0054] In some embodiments of the present invention, Figure 4As shown, the support plate 204 is a hollow structure, the hollow structure is connected to the accommodating cavity 10, and the support plate 204 is provided with a first through hole 13, and the first through hole 13 is respectively connected to the outer duct 8 and the hollow structure. In this way, by opening the first through hole 13 in the support plate 204, the air of the outer duct 8 can be introduced into the accommodating cavity 10 through the first through hole 13 and the internal space of the support plate 204, so that the low-temperature airflow of the outer duct 8 can be used to cool the engine bearing cavity, reduce the airflow temperature in the accommodating cavity 10, and when flowing along the surface of the power extraction motor 4 to the exhaust hole 12 at the tip of the tail cone, it can also play a cooling function for the power extraction motor 4, and then the motor is fully prevented from working failure caused by overheating of the motor working temperature under the dual cooling effect of lubricating oil cooling and air cooling.

[0055] Further, in some embodiments of the present invention, Figure 2 As shown, the motor lubricating oil pipeline 6 sequentially passes through the first annular support 201, the second annular support 202 and the third annular support 203, and the motor lubricating oil pipeline 6 located in the inner channel 9 and the accommodating cavity 10 is penetrated in the support support plate 204. It can be understood that the pipelines required for the power extraction motor 4, including but not limited to the cable 402, the motor lubricating oil pipeline 6, the return oil pipeline, etc., can all pass through the support support plate 204.

[0056] Among them, Figure 5 As shown, the second annular support 202 is provided with a second through hole 14 , the motor oil pipeline 6 passes through the second through hole 14 , and there is a gap 15 between the second through hole 14 and the motor oil pipeline 6 , and the gap 15 is connected to the outer culvert channel 8 .

[0057] In this way, there is a gap 15 between the second through hole 14 and the motor oil pipeline 6. Figure 2 In the direction indicated by the middle arrow, the air in the outer duct 8 can be introduced into the accommodating cavity 10 through the second through hole 14 and the internal space of the supporting support plate 204, and flow along the surface of the power extraction motor 4 to the exhaust hole 12 at the tip of the tail cone, thereby further introducing the outer duct air to have a heat insulation effect on the motor surface and reduce the heat conduction of the inner duct 9 to the power extraction motor 4.

[0058] In some embodiments of the present invention, the support plate 204 includes a load-bearing support plate 2041 and a flow channel support plate 2042. Figure 4 As shown, the load-bearing support plate 2041 is provided with a first through hole 13, and the interior of the load-bearing support plate 2041 is provided with a first cavity 20411 connected to the accommodating cavity 10 to form a hollow structure. The load-bearing support plate 2041 is connected to the first annular support 201, the second annular support 202 and the third annular support 203, so as to transmit the radial force of the low-pressure turbine rotor 1 to the external mounting node of the engine through the load-bearing support plate 2041.

[0059] Specifically, the upper end and the lower end of the load-bearing support plate 2041 are respectively provided with a first through hole 13 and a third through hole 19, so that Figure 2 In the direction indicated by the middle arrow, the air in the outer channel 8 can be introduced into the accommodating cavity 10 through the first through hole 13, the first cavity 20411, and the third through hole 19.

[0060] like Figure 4 As shown, the flow channel support plate 2042 is disposed between the second annular support 202 and the third annular support 203, and the flow channel support plate 2042 is provided with a second cavity 20421 in communication with the accommodating cavity 10, and the load-bearing support plate 2041 and the motor lubricating oil pipeline 6 are both disposed in the second cavity 20421. Specifically, as Figure 3 As shown, the flow channel support plate 2042 is designed as a blade structure. The high-temperature combustion gas flow in the inner channel 9 flows through the surface of the flow channel support plate 2042, which can optimize the airflow guidance, reduce flow losses, and thus improve the performance of the entire system.

[0061] In this way, the support plate 204 is designed as a multi-layer support plate structure, which can effectively improve the structural strength, reliably transmit the radial force of the rotor, optimize the gas flow characteristics, and improve the performance of the equipment. The overall structure of the support plate is reasonably designed and compactly arranged.

[0062] In some embodiments of the present invention, the turbofan engine turbine structure with built-in motor power extraction also includes an engine bearing lubricating oil pipeline 16, such as Figure 4 As shown, the engine bearing lubricating oil pipeline 16 is set in the radial direction of the exhaust bearing 2 and penetrates the support plate 204. The engine bearing lubricating oil pipeline 16 is used to provide cooling lubricating oil to the bearing 11. Specifically, the engine bearing lubricating oil pipeline 16 is set in the load-bearing support plate 2041. Further, as Figure 4 As shown, a limit support plate 18 is also provided in the load-bearing support plate 2041, and the limit support plate 18 is provided between the load-bearing support plate 2041 and the engine bearing lubricating oil pipeline 16 to provide a limit support for the engine bearing lubricating oil pipeline 16 and reduce the vibration problem of the engine bearing lubricating oil pipeline 16. In this way, cooling lubricating oil is transported to the engine bearing 11 through the engine bearing lubricating oil pipeline 16, so that the bearing 11 can be cooled and the working reliability of the engine can be improved.

[0063] According to an embodiment of the present invention, on the other hand, a turbofan engine is also provided, including a turbofan engine turbine structure with built-in motor power extraction in each of the above embodiments. In this way, the power extraction motor 4 is placed inside the engine tail cone 3, and the rotor shaft 401 of the power extraction motor 4 is directly connected to the low-pressure turbine rotor 1 through the transmission shaft 5 to achieve the output of the turbine shaft power. Compared with the traditional accessory transmission power extraction scheme, there is no need to set up a complex accessory transmission device, the structure is simpler, and the R&D and manufacturing costs of the engine are reduced. And the motor cable 402 is inserted into the motor lubricating oil pipeline 6 and led out to the outside of the engine. The lubricating oil can be used to cool the wires, reduce the damage to the wires by the high temperature environment of the turbine, and ensure the reliable operation of the wires. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the turbofan engine turbine structure with built-in motor power extraction, so it will not be repeated here.

[0064] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A turbofan engine turbine structure with built-in motor power extraction, characterized in that: include: A low-pressure turbine rotor (1); An exhaust support (2) is coaxially mounted on the low-pressure turbine rotor (1), and the exhaust support (2) is rotationally connected to the low-pressure turbine rotor (1); An engine tail cone (3) is coaxially fixed to the exhaust support (2); A power extraction motor (4) is arranged in the engine tail cone (3), and the power extraction motor (4) is coaxially fixed to the exhaust support (2), and the rotor shaft (401) of the power extraction motor (4) is connected to the low-pressure turbine rotor (1) via a transmission shaft (5); The motor lubricating oil pipeline (6) is arranged to penetrate the exhaust support (2) in a radial direction, the inlet end (601) of the motor lubricating oil pipeline (6) is connected to the lubricating oil cooling circulation system, the outlet end (602) is connected to the power extraction motor (4), and the cable (402) of the power extraction motor (4) is arranged to penetrate the motor lubricating oil pipeline (6).

2. The turbofan engine turbine structure with built-in motor power extraction according to claim 1, characterized in that: The inlet end (601) of the motor lubricating oil pipeline (6) is provided with an electro-hydraulic separation joint (7), and the electro-hydraulic separation joint (7) has an electrical interface (701) and a liquid interface (702), wherein the electrical interface (701) is used for the cable (402) to pass through, and the liquid interface (702) is used for connecting to the lubricating oil cooling circulation system.

3. The turbofan engine turbine structure with built-in motor power extraction according to claim 1, characterized in that: The transmission shaft (5) comprises a first connecting section (501), a second connecting section (502), and an inclined transition section (503) arranged between the first connecting section (501) and the second connecting section (502), the outer diameter of the first connecting section (501) is larger than the outer diameter of the second connecting section (502), the first connecting section (501) is connected to the low-pressure turbine rotor (1) via a spline meshing, and the second connecting section (502) is connected to the rotor shaft (401) of the power extraction motor (4) via a spline meshing.

4. The turbofan engine turbine structure with built-in motor power extraction according to claim 3, characterized in that: The splines on the first connecting section (501) and the second connecting section (502) are drum-shaped splines.

5. A turbofan engine turbine structure with built-in motor power extraction according to any one of claims 1 to 4, characterized in that: The exhaust support (2) comprises: A first annular support (201), a second annular support (202) and a third annular support (203) are sequentially arranged in a radial direction of the exhaust support (2) from the outside to the inside, so as to form a multi-layer support structure; an outer passage (8) is formed between the first annular support (201) and the second annular support (202); an inner passage (9) is formed between the second annular support (202) and the third annular support (203); a receiving cavity (10) for mounting the low-pressure turbine rotor (1) is formed inside the third annular support (203); the low-pressure turbine rotor (1) and the third annular support (203) are rotatably connected via a bearing (11); the engine tail cone (3) is connected to the third annular support (203); and an exhaust hole (12) is provided at the conical tip (301) of the engine tail cone (3); A plurality of support plates (204) are arranged along the radial direction of the exhaust support (2) and are spaced apart around the circumference of the exhaust support (2); the support plates (204) are connected to the first annular support (201), the second annular support (202) and the third annular support (203).

6. The turbofan engine turbine structure with built-in motor power extraction according to claim 5, characterized in that: The support plate (204) is a hollow structure, the hollow structure is connected to the accommodating cavity (10), and the support plate (204) is provided with a first through hole (13), and the first through hole (13) is respectively connected to the outer culvert channel (8) and the hollow structure.

7. The turbofan engine turbine structure with built-in motor power extraction according to claim 6, characterized in that: The motor lubricating oil pipeline (6) passes through the first annular support (201), the second annular support (202) and the third annular support (203) in sequence, and the motor lubricating oil pipeline (6) located in the inner channel (9) and the accommodating cavity (10) is penetrated in the support support plate (204); The second annular support (202) is provided with a second through hole (14), the motor oil pipeline (6) passes through the second through hole (14), and there is a gap (15) between the second through hole (14) and the motor oil pipeline (6), and the gap (15) is connected to the outer duct (8).

8. The turbofan engine turbine structure with built-in motor power extraction according to claim 7, characterized in that: The support plate (204) comprises: A load-bearing support plate (2041), wherein a first cavity (20411) communicating with the accommodating cavity (10) is provided inside to form the hollow structure; the load-bearing support plate (2041) is provided with the first through hole (13), and the load-bearing support plate (2041) is connected to the first annular support (201), the second annular support (202), and the third annular support (203); The flow channel support plate (2042) is arranged between the second annular support (202) and the third annular support (203), and the interior of the flow channel support plate (2042) is provided with a second cavity (20421) connected to the accommodating cavity (10), and the load-bearing support plate (2041) and the motor lubricating oil pipeline (6) are both penetrated in the second cavity (20421).

9. The turbofan engine turbine structure with built-in motor power extraction according to claim 5, characterized in that: Also includes: An engine bearing lubricating oil pipeline (16) is arranged in the support support plate (204) along the radial direction of the exhaust support (2), and the engine bearing lubricating oil pipeline (16) is used to provide cooling lubricating oil to the bearing (11).

10. A turbofan engine, characterized in that: A turbofan engine turbine structure comprising a built-in electric motor power extraction as claimed in any one of claims 1 to 9.

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