Turbine outer ring assembly and turbine engine

Abstract

The present invention relates to the technical field of aero-engines, and discloses a turbine outer ring assembly and a turbine engine. The turbine outer ring assembly comprises: a turbine outer ring, on which a first matching structure is arranged; a casing, which is arranged on the outer side of the turbine outer ring; a support frame, which is fixedly connected between the casing and the turbine outer ring, on which a second matching structure is arranged; an anti-rotation structure, which is arranged on the inner side of the turbine outer ring, on which a third matching structure is arranged, and the third matching structure comprises at least two matching parts extending in different directions, and the matching parts are matched and connected with the first matching structure and the second matching structure, and are suitable for positioning and preventing rotation of the turbine outer ring, thereby ensuring the stability of the connection, and no need to set connecting structures such as pins and gaskets for supporting connection, thereby simplifying the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of aeroengines, and in particular to a turbine outer ring assembly and a turbine engine. Background Art

[0002] Among the measures to improve the performance of aircraft engines, increasing the temperature before the turbine is an important way, so the turbine rotor and stator blades, turbine outer ring and other components that work directly in the high-temperature gas environment will be subject to severe challenges. The turbine outer ring is a stator part that faces the high-temperature erosion of the gas. In addition to being directly impacted by the gas, it must also ensure stable centering and positioning at high temperatures, and there must be a suitable tip clearance between the turbine blades to ensure turbine efficiency and safety. This places high demands on the high-temperature deformation reliability of the turbine outer ring and its connection structure.

[0003] The design of turbine outer rings of in-service aircraft engines mainly adopts segmented turbine outer rings and integral turbine outer rings.

[0004] The segmented turbine outer ring is composed of a metal outer ring support frame and honeycomb welding. However, when the engine is in operation, the segmented metal outer ring tends to flatten under stress due to heat, which will increase the deformation unevenness of the outer ring and intensify the scraping between the turbine blade tip and the turbine outer ring, thereby affecting the safety and efficiency of the turbine. Regarding the segmented CMC (ceramic matrix composite) turbine outer ring, in view of the characteristics of ceramic matrix composite materials, the assembly scheme of the segmented turbine outer ring is mainly based on combustion engines and high bypass ratio turbofans, which has high space requirements and is not universally applicable. The current segmented turbine outer ring generally uses high-temperature alloy materials. The segmented outer ring is connected to the casing through a hook, and the turbine outer ring is fixed by a metal hook. The segmented CMC turbine outer ring currently used at home and abroad is fixed to the intermediate casing by an axial pin, and then connected to the outer casing with the help of a hook structure. This structure will increase the complexity of the structure and put forward high requirements on the space occupied by the structure.

[0005] For the integral CMC turbine outer ring, a multi-pin support connection structure is generally adopted, in which radial pins are embedded in the turbine outer ring to achieve centering and anti-rotation. This structure will increase the number of parts, and the assembly structure of the turbine outer ring is more complicated. The service stability has yet to be verified, and the difficulty of subsequent assembly and disassembly will naturally increase. Summary of the invention

[0006] In view of this, the present invention provides a turbine outer ring assembly and a turbine engine to solve the problem of the complex connection structure of the existing turbine outer ring.

[0007] In a first aspect, the present invention provides a turbine outer ring assembly, comprising:

[0008] A turbine outer ring, wherein a first matching structure is provided on the turbine outer ring;

[0009] A casing, arranged outside the turbine outer ring;

[0010] A support frame, fixedly connected between the casing and the turbine outer ring, and provided with a second matching structure;

[0011] An anti-rotation structure is arranged on the inner side of the turbine outer ring. A third matching structure is provided on the anti-rotation structure. The third matching structure includes at least two matching parts extending in different directions. The matching parts are matched and connected with the first matching structure and the second matching structure, and are suitable for positioning and preventing the turbine outer ring from rotating.

[0012] Beneficial effect: By setting up an anti-rotation structure, the third matching structure on the anti-rotation structure includes at least two matching parts extending in different directions, and the matching parts can be matched and connected with the first matching structure on the outer ring of the turbine and the second matching structure on the support frame, so as to realize the positioning and anti-rotation of the outer ring of the turbine, and ensure the stability of the connection. There is no need to set connecting structures such as pins and gaskets for supporting the connection, thereby simplifying the structure.

[0013] In an optional embodiment, the third matching structure includes:

[0014] A first matching portion, extending along the axial direction, wherein the first matching portion is matched and connected with the first matching structure;

[0015] The second matching portion is extended in the radial direction, and the second matching portion is matched and connected with the second matching structure.

[0016] Beneficial effect: By setting the third matching structure to include a first matching part and a second matching part, and the first matching part is set along the axial direction and the second matching part is set along the radial direction, the axial and radial directions of the outer ring of the turbine can be centered and positioned respectively, and the first matching structure and the second matching structure are matched and connected to achieve anti-rotation of the outer ring of the turbine.

[0017] In an optional embodiment, the first matching portion is connected to the first matching structure in a clearance fit, and the second matching portion is connected to the second matching structure in a clearance fit.

[0018] Beneficial effect: By loosely connecting the first mating portion with the first mating structure and loosely connecting the second mating portion with the second mating structure, it is possible to allow space for free thermal expansion between the support frame and the turbine outer ring, so that the turbine outer ring can produce unconstrained uniform deformation.

[0019] In an optional embodiment, the anti-rotation structure is arranged in a ring shape, and a plurality of the third matching structures are arranged around the circumference of the anti-rotation structure.

[0020] Beneficial effect: By setting the anti-rotation structure as an annular structure to match the structural shape of the turbine outer ring, and by setting multiple third matching structures in the circumferential direction of the anti-rotation structure, it is possible to set one anti-rotation structure to achieve positioning and anti-rotation at multiple circumferential positions of the turbine outer ring, with fewer parts, lower weight and simpler structure.

[0021] In an optional embodiment, the matching portion is engaged with the first matching structure, and the matching portion is engaged with the second matching structure.

[0022] Beneficial effect: By snapping the matching part with the first matching structure and snapping the matching part with the second matching structure, assembly is facilitated.

[0023] In an optional embodiment, the matching portion is a boss, and the first matching structure and the second matching structure are grooves.

[0024] Beneficial effect: By setting the matching part as a boss and the first matching structure and the second matching structure as a groove, the connection between the matching part and the first matching structure and the second matching structure is simpler.

[0025] In an optional embodiment, the turbine outer ring assembly includes:

[0026] The elastic member is arranged between the support frame and the turbine outer ring and is suitable for axially supporting the turbine outer ring.

[0027] Beneficial effect: By arranging an elastic part between the support frame and the outer ring of the turbine, the outer ring of the turbine can be axially supported. Due to the elasticity of the elastic part, a flexible connection is achieved between the support frame and the outer ring of the turbine, so that the outer ring of the turbine can have space for free expansion in the axial direction, and excessive thermal stress between the anti-rotation structure and the outer ring of the turbine can be avoided. The operation of the engine will generate complex vibrations and transmit them to the outer ring of the turbine. The elastic part can also serve as an external damper to effectively prevent the possibility of the outer ring of the turbine failing due to long-term vibration load.

[0028] In an optional embodiment, the elastic member is an annular structure; and / or the elastic member is a C-shaped elastic ring.

[0029] In an optional embodiment, the casing is connected to the support frame via a hook structure;

[0030] And / or, the turbine outer ring is an integral turbine outer ring;

[0031] And / or, the turbine outer ring is made of ceramic matrix composite material;

[0032] And / or, the casing, the support frame and the anti-rotation structure are all made of metal.

[0033] Beneficial effect: By connecting the casing and the support frame through a hook structure, the hook connection design between the turbine outer ring and the casing of the existing engine can be retained, without making major changes to the engine, and the reliability is higher.

[0034] In a second aspect, the present invention further provides a turbine engine, comprising: the above-mentioned turbine outer ring assembly.

[0035] Beneficial effect: Because the turbine engine includes the above-mentioned turbine outer ring assembly, it has the same effect as the above-mentioned turbine outer ring assembly and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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.

[0037] Figure 1 This is a schematic diagram of a partial structure of a turbine outer ring according to an embodiment of the present invention;

[0038] Figure 2 for Figure 1 A cross-sectional view of the turbine outer ring is shown;

[0039] Figure 3 It is a schematic diagram of the structure of the turbine outer ring;

[0040] Figure 4 is a structural schematic diagram of the support frame;

[0041] Figure 5 It is a structural schematic diagram of the anti-rotation structure;

[0042] Figure 6 for Figure 5 A partial enlarged view of .

[0043] Description of reference numerals:

[0044] 1-turbine outer ring; 101-first matching structure; 2-casing; 3-support frame; 301-second matching structure; 4-anti-rotation structure; 401-third matching structure; 4011-first matching part; 4012-second matching part; 5-elastic member; 6-hook structure. DETAILED DESCRIPTION

[0045] 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.

[0046] Combine the following Figures 1 to 6 , describing an embodiment of the present invention.

[0047] According to an embodiment of the present invention, on the one hand, a turbine outer ring assembly is provided, comprising: a turbine outer ring 1, on which a first matching structure 101 is provided; a casing 2, arranged on the outer side of the turbine outer ring 1; a support frame 3, fixedly connected between the casing 2 and the turbine outer ring 1, on which a second matching structure 301 is provided; an anti-rotation structure 4, arranged on the inner side of the turbine outer ring 1, on which a third matching structure 401 is provided, and the third matching structure 401 includes at least two matching parts extending in different directions, and the matching parts are matched and connected with the first matching structure 101 and the second matching structure 301, and are suitable for positioning and preventing the turbine outer ring 1 from rotating.

[0048] By setting the anti-rotation structure 4, the third matching structure 401 on the anti-rotation structure 4 includes at least two matching parts extending in different directions. The matching parts can be matched and connected with the first matching structure 101 on the turbine outer ring 1 and the second matching structure 301 on the support frame 3, so as to realize the positioning and anti-rotation of the turbine outer ring 1, ensure the stability of the connection, and no longer need to set pins, gaskets and other connecting structures for supporting connection, thereby simplifying the structure.

[0049] like Figure 6 As shown, the third matching structure 401 in this embodiment includes: a first matching portion 4011, which is extended along the axial direction and matched with the first matching structure 101; a second matching portion 4012, which is extended along the radial direction and matched with the second matching structure 301. By configuring the third matching structure 401 to include the first matching portion 4011 and the second matching portion 4012, and the first matching portion 4011 is arranged along the axial direction and the second matching portion 4012 is arranged along the radial direction, the axial and radial directions of the turbine outer ring 1 can be centered and positioned respectively, and the first matching structure 101 and the second matching structure 301 are matched and connected, so as to realize the anti-rotation of the turbine outer ring 1.

[0050] In this embodiment, the first matching portion 4011 is snap-fitted to the first matching structure 101, and the second matching portion 4012 is snap-fitted to the second matching structure 301. Therefore, during assembly, it is only necessary to snap-fit ​​the first matching portion 4011 to the first matching structure 101, and the second matching portion 4012 to the second matching structure 301 together to achieve assembly, which is relatively convenient.

[0051] Specifically, the matching part is a boss, that is, the first matching part 4011 and the second matching part 4012 are both bosses, and the first matching structure 101 and the second matching structure 301 are grooves. By setting the matching part as a boss and the first matching structure 101 and the second matching structure 301 as grooves, the connection between the matching part and the first matching structure 101 and the second matching structure 301 is simpler. As a convertible embodiment, it is also possible that the matching part is a groove, and the first matching structure 101 and the second matching structure 301 are both bosses. As a convertible embodiment, it is also possible that the first matching part 4011 and the second matching part 4012 are hooks, and the first matching structure 101 and the second matching structure 301 are slots.

[0052] like Figure 4 and Figure 5 As shown, along the circumferential direction, the first matching structure 101 and the second matching structure 301 are respectively provided with 6, and the first matching part 4011 and the second matching part 4012 are correspondingly provided with 6. The shape of the boss and the groove are both rectangular. As a convertible embodiment, it can also be that the specific number of the first matching structure 101, the second matching structure 301, the first matching part 4011 and the second matching part 4012 can be set according to actual needs, and the specific shape can be set according to actual needs, and no excessive restrictions are made here.

[0053] The turbine outer ring assembly in this embodiment is in an annular structure as a whole, that is, the casing 2, the support frame 3 and the turbine outer ring 1 are all arranged in an annular shape.

[0054] like Figure 5 As shown, the anti-rotation structure 4 in this embodiment is provided with one, which is arranged in an annular shape, and a plurality of third matching structures 401 are arranged in the circumferential direction of the anti-rotation structure 4. By setting the anti-rotation structure 4 as an annular structure, it matches the structural shape of the turbine outer ring 1, and by setting a plurality of third matching structures 401 in the circumferential direction of the anti-rotation structure 4, a single anti-rotation structure 4 can be provided to realize positioning and anti-rotation of a plurality of positions in the circumferential direction of the turbine outer ring 1, with fewer parts, lower weight, and simpler structure.

[0055] Of course, in some other embodiments, multiple anti-rotation structures 4 may be provided along the circumferential direction, and each anti-rotation structure 4 may be provided with a third matching structure 401. Compared with the connection structure connected by pins in the prior art, the specific setting of the anti-rotation structure 4 in this embodiment does not require other additional structures such as gaskets, and thus the structure is relatively simple.

[0056] The first matching portion 4011 is connected with the first matching structure 101 by a clearance fit, and the second matching portion 4012 is connected with the second matching structure 301 by a clearance fit. By connecting the first matching portion 4011 with the first matching structure 101 by a clearance fit, and connecting the second matching portion 4012 with the second matching structure 301 by a clearance fit, it is possible to allow a space for free thermal expansion between the support frame 3 and the turbine outer ring 1, so that the turbine outer ring 1 can produce unconstrained uniform deformation. As a convertible embodiment, it is also possible that the first matching portion 4011 is connected with the first matching structure 101 by a tight fit, and the second matching portion 4012 is connected with the second matching structure 301 by a tight fit.

[0057] like Figure 2 As shown, the turbine outer ring assembly in this embodiment includes: an elastic member 5, which is arranged between the support frame 3 and the turbine outer ring 1, and is suitable for axially supporting the turbine outer ring 1. By arranging the elastic member 5 between the support frame 3 and the turbine outer ring 1, the turbine outer ring 1 can be axially supported. Since the elastic member 5 is elastic, a flexible connection is achieved between the support frame 3 and the turbine outer ring 1, so that the turbine outer ring 1 can have a space for free expansion in the axial direction, and can also avoid excessive thermal stress between the anti-rotation structure 4 and the turbine outer ring 1. The operation of the engine will generate complex vibrations and transmit them to the turbine outer ring 1. The elastic member 5 can also serve as an external damper to effectively prevent the possibility of the turbine outer ring 1 failing due to long-term vibration loads.

[0058] Specifically, the elastic member 5 in this embodiment is an integral annular structure, specifically a C-shaped elastic ring. As a convertible implementation, the elastic member 5 may also be in other shapes, which are not limited here. As a convertible implementation, the elastic member 5 may also be a plurality of split structures that together form an annular structure.

[0059] like Figure 1 and Figure 2 As shown, the casing 2 and the support frame 3 in this embodiment are connected by a hook structure 6. By connecting the casing 2 and the support frame 3 by the hook structure 6, the hook connection scheme design of the turbine outer ring 1 and the casing 2 of the existing engine can be retained, without making major changes to the engine, and the reliability is higher.

[0060] The turbine outer ring 1 in this embodiment is an integral turbine outer ring. As a convertible implementation, the turbine outer ring assembly as a whole is a split turbine outer ring. The split turbine outer ring is usually brazed together with a metal support frame and a metal honeycomb. In actual use, the metal support frame in the engine can be retained, the honeycomb structure can be removed, and the integral turbine outer ring can be added. In this way, the original split turbine outer ring can be replaced in situ without modifying other structures of the engine, and the applicability is strong.

[0061] The turbine outer ring 1 in this embodiment is made of ceramic matrix composite material, that is, the turbine outer ring 1 is a CMC turbine outer ring, which simplifies the structure while giving full play to the excellent performance of the ceramic matrix composite material.

[0062] The casing 2, the support frame 3 and the anti-rotation structure 4 in this embodiment are all made of metal, specifically high-temperature alloy.

[0063] The turbine outer ring assembly of this embodiment can be a relatively convenient replacement for the existing metal outer ring design of the engine, with a simple structure, a small number of parts, high feasibility and reliability, a simple overall structure, and a low requirement for the internal space of the engine casing. The present invention retains the hook connection design of the turbine outer ring 1 of the existing engine, and can use a CMC turbine outer ring, which simplifies the structure while giving full play to the excellent performance of the CMC material.

[0064] The turbine outer ring assembly of this embodiment is mainly proposed for the integral CMC turbine outer ring. The connection structure relies on multiple rectangular grooves on the sides to complete the radial centering positioning of the integral CMC turbine outer ring. The positioning method is simple and the precision is high. The C-shaped elastic ring is relied on for axial positioning and support, so as to weaken the thermal stress between the CMC turbine outer ring and the metal, offset the thermal expansion of the turbine outer ring, and avoid the influence of contact thermal stress and vibration between the CMC turbine outer ring and the metal. The whole ring support frame is used as the intermediate connection part between the casing and the integral CMC outer ring, which can be used as a replacement mounting part for the existing split metal outer ring, effectively expanding the scope of application.

[0065] The turbine outer ring assembly of this embodiment has been verified through simulation and can meet the actual use environment.

[0066] According to an embodiment of the present invention, on the other hand, a turbine engine is provided, comprising: the above-mentioned turbine outer ring assembly.

[0067] 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 turbine outer ring assembly, characterized in that: include: A turbine outer ring (1), wherein a first matching structure (101) is provided on the turbine outer ring (1); A casing (2) is arranged outside the turbine outer ring (1); A support frame (3) is fixedly connected between the casing (2) and the turbine outer ring (1), and a second matching structure (301) is provided on the support frame (3); An elastic member (5) is provided between the support frame (3) and the turbine outer ring (1), and is suitable for axially supporting the turbine outer ring (1); The anti-rotation structure (4) is axially arranged on a side of the turbine outer ring (1) away from the elastic member (5), the anti-rotation structure (4) is arranged in an annular shape, and a plurality of third matching structures (401) are arranged in the circumferential direction of the anti-rotation structure (4). Suitable for positioning and preventing the turbine outer ring (1) from rotating; The third matching structure (401) comprises: A first matching portion (4011) is arranged to extend along the axial direction, and the first matching portion (4011) is matched and connected with the first matching structure (101); The second matching portion (4012) is arranged to extend radially, and the second matching portion (4012) is matched and connected with the second matching structure (301).

2. The turbine outer ring assembly according to claim 1, characterized in that: The first matching portion (4011) is connected to the first matching structure (101) by a clearance fit, and the second matching portion (4012) is connected to the second matching structure (301) by a clearance fit.

3. The turbine outer ring assembly according to claim 1, characterized in that: The first matching portion (4011) is snap-fitted to the first matching structure (101), and the second matching portion (4012) is snap-fitted to the second matching structure (301).

4. The turbine outer ring assembly according to claim 3, characterized in that: The first matching portion (4011) and the second matching portion (4012) are bosses, and the first matching structure (101) and the second matching structure (301) are grooves.

5. The turbine outer ring assembly according to claim 1, characterized in that: The elastic member (5) is an annular structure.

6. The turbine outer ring assembly according to claim 5, characterized in that: The elastic member (5) is a C-shaped elastic ring.

7. The turbine outer ring assembly according to any one of claims 1 to 6, characterized in that: The casing (2) and the support frame (3) are connected via a hook structure (6); And / or, the turbine outer ring (1) is an integral turbine outer ring; And / or, the turbine outer ring (1) is made of a ceramic-based composite material; And / or, the casing (2), the support frame (3) and the anti-rotation structure (4) are all made of metal.

8. A turbine engine, characterized in that: include: The turbine outer ring assembly according to any one of claims 1 to 7.

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