Flexible connection structure of aero-engine stator

Abstract

The utility model provides a flexible connecting structure of an aero-engine stator, which is used for connecting a first stator piece and a second stator piece, and is characterized in that the flexible connecting structure comprises a first connecting end, a second connecting end and a bending part. The first connecting end is used for being connected with a first stator piece. The second connecting end is used for being connected with a second stator piece. The number of the bent parts is multiple, and the multiple bent parts are connected in sequence. The flexible connection structure can meet the limiting condition of the assembly space.

Description

TECHNICAL FIELD

[0001] The utility model relates to aero-engine connecting structure especially relates to a flexible connecting structure of aero-engine stator. BACKGROUND

[0002] The engine stator is the assembly formed by all non-rotating parts in the engine, generally including the casing, stator blade, flow regulator and the like. The connecting structure is an important part used between the outer stator and the inner stator in the aero-engine for supporting, force transmission, sealing and the like. Therefore, the connecting structure needs to bear the force transmitted from the inner stator in the working state.

[0003] When the connecting structure used for connecting the inner and outer stators of the aero-engine has relatively large rigidity, the deformation of the connecting structure and the inner and outer stators is not coordinated, which further causes the stopper connection position to be separated, and the local stress concentration phenomenon of the connecting structure is obvious. If the connecting structure with relatively large rigidity is replaced by the flexible connecting structure, the deformation ability of the connecting structure and the connected inner and outer stator parts is increased, i.e. the parts are more easily deformed and coordinated, so that the local stress concentration phenomenon of the connecting structure is weakened, and the material utilization of the connecting structure is improved. The flexible connecting structure is thinner than the rigid connecting structure, and can achieve the effect of weight reduction.

[0004] Meanwhile, the radial length of the connecting structure is limited in the limited space between the complex structure of the inner and outer stators of the aero-engine; wherein the radial direction refers to the radial direction in the engine coordinate system, such as the radial distance between the inner and outer stators, and the radial connecting structure connecting the inner and outer stators. SUMMARY

[0005] The utility model aims at providing a flexible connecting structure of aero-engine stator, which can meet the limitation of the assembly space.

[0006] One aspect of the utility model provides a flexible connecting structure of aero-engine stator, which is used for connecting a first stator part and a second stator part, and comprises a first connecting end, a second connecting end and a bending part; wherein the first connecting end is used for connecting the first stator part; the second connecting end is used for connecting the second stator part; and the bending part is multiple, and the multiple bending parts are connected in sequence.

[0007] In an embodiment, the first connecting end of the flexible connecting structure comprises a first mating collar arranged in the circumferential direction of the first connecting end and a first bolt mounting edge connected to the first stator member by a fastener; and / or the second connecting end of the flexible connecting structure comprises a second mating collar arranged in the circumferential direction of the second connecting end and a second bolt mounting edge connected to the second stator member by a fastener.

[0008] In an embodiment, the fastener is a bolt or a screw.

[0009] In an embodiment, the first connecting end of the flexible connecting structure is lapped on the first stator member; and / or the second connecting end of the flexible connecting structure is lapped on the second stator member.

[0010] In an embodiment, the flexible connecting structure and the first stator member are integrally formed, and the flexible connecting structure extends to the second stator member; or the flexible connecting structure and the second stator member are integrally formed, and the flexible connecting structure extends to the first stator member.

[0011] In an embodiment, the bending angles of the plurality of bending portions are different; and / or the bending portions have rounded corners.

[0012] In an embodiment, the first stator member is a load-bearing casing, the second stator member is a bearing seat, a first end of the load-bearing casing and a first end of the bearing seat are connected by a support structure; and the flexible connecting structure connects a second end of the load-bearing casing and a second end of the bearing seat.

[0013] In an embodiment, the first stator member is an outer layer stator, the second stator member is an inner layer stator, a first end of the outer layer stator and a first end of the inner layer stator are connected by a support structure; and the flexible connecting structure connects a second end of the outer layer stator and a second end of the inner layer stator.

[0014] In an embodiment, the outer layer stator is a load-bearing casing, and the inner layer stator is a bearing seat.

[0015] In an embodiment, the flexible connecting structure comprises a first bending portion, a second bending portion, a third bending portion and a fourth bending portion connected in sequence; the first bending portion is connected to the first connecting end, and the fourth bending portion is connected to the second connecting end.

[0016] The bending features of the plurality of bending portions of the flexible connecting structure of the aero-engine stator can greatly reduce the rigidity of the connecting structure, improve the local stress concentration phenomenon of the connecting structure, reduce the stress level, and make the stress distribution more uniform, and meanwhile, the plurality of bending portions make the flexible connecting structure of the utility model occupy a smaller space, and the assembly space limitation condition can be met. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other features, properties, and advantages of the utility model will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0018] Figure 1 is a schematic view of an embodiment of the flexible connecting structure of the aero-engine stator according to the utility model;

[0019] Figure 2 is a schematic view of another embodiment of the flexible connecting structure of the aero-engine stator according to the utility model. DETAILED DESCRIPTION

[0020] The engine stator is a component formed by all non-rotating parts in the engine, generally including a casing, stator blades, a flow regulator, etc.The connecting structure is an important part used between the outer stator and the inner stator in the aero-engine for supporting, force transmission, sealing, etc.Therefore, the connecting structure needs to bear the force transmitted from the inner stator in the working state.

[0021] When the connecting structure used for connecting the inner and outer stators of the aero-engine has a relatively large rigidity, deformation incoordination is prone to occur between the connecting structure and the inner and outer stators, and then the stop connection position of the stop port is disconnected; and the local stress concentration phenomenon of the connecting structure is obvious.If the rigid connecting structure is replaced by a flexible connecting structure, the deformation ability of the connecting structure and the connected inner and outer stator parts increases, i.e.the parts are more easily deformed and coordinated, so that the local stress concentration phenomenon of the connecting structure is weakened, and the material utilization rate of the connecting structure can be improved.

[0022] However, the rigid connecting structure and the connected inner and outer stator parts are not easily deformed and coordinated, the connecting stop port between the rigid connecting structure and the connected inner and outer stator parts is more easily disconnected; the stress level of the stress concentration position of the rigid connecting structure is high, and the stress distribution is uneven; the material utilization rate of the rigid connecting structure is low, and the weight is large.

[0023] The flexible connecting structure is thinner than the rigid connecting structure, and can achieve the effect of weight reduction.At the same time, the radial length of the connecting structure is limited in the limited space between the complex structure of the inner and outer stators of the aero-engine.

[0024] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the present invention and not to limit it. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the scope or spirit thereof. For example, features shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, the present invention is intended to cover these modifications and variations that fall within the scope of the appended claims and their equivalents.

[0025] As used herein, the terms “first,” “second,” “third,” and “fourth” are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of the individual components.

[0026] The term "stator" refers to the assembly formed by all non-rotating parts in an engine, generally including the engine casing, stator blades, and rectifier. The term "connection structure" refers to a structure that connects two or more parts, generally serving functions such as support, force transmission, and sealing. The term "flexible structure" refers to a structure with a certain degree of flexibility and resilience, as opposed to a rigid structure.

[0027] The flexible connection structure of the aero-engine stator of this invention is used to connect a first stator component and a second stator component. The first stator component is the outer stator, and the second stator component is the inner stator.

[0028] In a double-layer casing of an aero-engine, the outer casing is the outer stator, such as the extension casing or the outer casing of the combustion chamber; the inner casing is the inner stator, such as the inner casing of the final stage of the high-pressure compressor or the inner casing of the combustion chamber.

[0029] Figure 1 An embodiment of the flexible connection structure 1 for the stator of an aero-engine according to this utility model is shown. In such a way... Figure 1 In the illustrated embodiment, the flexible connection structure 1 includes a first connecting end, a second connecting end, and a bent portion 6. The first connecting end is used to connect with a first stator 7. The second connecting end is used to connect with a second stator 8. Multiple bent portions 6 are connected sequentially. The multiple bent portions 6 significantly reduce the stiffness of the connection structure, improve the phenomenon of local stress concentration in the connection structure, lower the stress level, and make the stress distribution more uniform. Simultaneously, the multiple bent portions 6 allow the flexible connection structure 1 of this invention to occupy less space, meeting assembly space constraints.

[0030] In one optional connection mode of the flexible connection structure 1 and the first stator 7 and the second stator 8, the first connection end of the flexible connection structure 1 comprises a first matching stop 11 and a first bolt mounting edge 13, the first matching stop 11 is arranged in the circumferential direction of the first connection end, and the first bolt mounting edge 13 is connected with the first stator 7 through the first fastener 9. The second connection end of the flexible connection structure 1 comprises a second matching stop 12 and a second bolt mounting edge 14, the second matching stop 12 is arranged in the circumferential direction of the second connection end, and the second bolt mounting edge 14 is connected with the second stator 8 through the second fastener 10. Wherein, the first fastener 9 and the second fastener 10 can be selected as a bolt or a screw. The connection mode of the stop and the fastener is more stable, can effectively bear larger external force and torque, reduces the risk of loosening or falling off of the connection part, and is convenient to install and disassemble, and has stronger adjustability, that is, the first matching stop 11, the first bolt mounting edge 13, the second matching stop 12 and the second bolt mounting edge 14 between the flexible connection structure 1 and the first stator 7 and the second stator 8 are not easy to separate.

[0031] In another optional connection mode, the first connection end of the flexible connection structure 1 is overlapped on the first stator 7, and the second connection end of the flexible connection structure 1 is overlapped on the second stator 8. The connection mode of the overlap does not need to be provided with a complex matching stop or other special structure at the connection part, which simplifies the design and manufacturing process of the flexible connection structure 1 and reduces the production cost.

[0032] In yet another optional connection mode, the flexible connection structure 1 and the first stator 7 are integrally formed, the flexible connection structure 1 extends to the second stator 8, that is, the flexible connection structure 1 is a part of the first stator 7 extending inward. Alternatively, the flexible connection structure 1 and the second stator 8 are integrally formed, and the flexible connection structure 1 extends to the first stator 7, that is, the flexible connection structure 1 is a part of the second stator 8 extending outward. The connection mode of the integral forming makes the flexible connection structure 1 and the first stator 7 or the second stator 8 form an integral whole, there is no connection interface, and the weak link that may exist at the connection part is eliminated, so that the strength and rigidity of the structure are greatly improved, and greater load and stress can be borne.

[0033] The rigidity of the flexible connection structure 1 of the utility model can be adjusted through the parameter characteristics of the bending part 6. Wherein, the parameter characteristics of the bending part 6 include the bending angle, the rounding diameter and the number of the bending part 6. As shown in the figure, Figure 1 The bending part 6 can have a rounding angle. The bending angle and the rounding diameter can be designed into any bending angle and rounding diameter as required.

[0034] The bending number of the bending part 6 can be designed into any number as required, and the utility model does not limit the number.

[0035] By changing the bending angle, the rounding diameter and the number of the bending portion 6, the flexible connection structure 1 with different stiffness can be designed.

[0036] As shown in the drawings, Figure 1 In one specific example, the number of the bending portion 6 is four, which are the first bending portion 2, the second bending portion 3, the third bending portion 4 and the fourth bending portion 5 connected in sequence. The first bending portion 2 is connected with the first connecting end, and the fourth bending portion 5 is connected with the second connecting end. Figure 1 According to the drawings, the space occupied by the flexible connection structure 1 with multiple bending portions of the utility model can be smaller than that of the rigid connection structure and the flexible connection structure 1 without bending portion.

[0037] Figure 2 Another embodiment of the flexible connection structure 1 of the aero-engine stator of the utility model is shown. In this embodiment, the first stator member is a load-bearing casing 107, and the second stator member is a bearing seat 108. Among them, the diameter of the load-bearing casing 107 is larger than that of the bearing seat 108 at the same axial position.

[0038] As shown in the drawings, Figure 2 The first end of the load-bearing casing 107 and the first end of the bearing seat 108 are connected through a support structure 113. The flexible connection structure 1 connects the second end of the load-bearing casing 107 and the second end of the bearing seat 108. Among them, the first end of the load-bearing casing 107, the first end of the bearing seat 108 and the support structure 113 are assembled together through the first connecting bolt 114 and the second connecting bolt 115. The support structure 113 is a rigid structure, while the flexible connection structure 1 of the utility model can deform in coordination with the deformation of the load-bearing casing 107, the bearing seat 108 and the support structure 113.

[0039] In the embodiment as shown in the drawings, Figure 2 The flexible connection structure 1 includes a first connecting end, a second connecting end and a bending portion 6. Among them, the first connecting end is used to connect with the load-bearing casing 107. The second connecting end is used to connect with the bearing seat 108. The bending portion 6 is multiple, and the multiple bending portions 6 are connected in sequence. The multiple bending portions 6 can greatly reduce the stiffness of the connection structure, improve the phenomenon of local stress concentration of the connection structure, reduce the stress level, and the stress distribution is more uniform. At the same time, the multiple bending portions 6 make the space occupied by the flexible connection structure 1 of the utility model smaller, which can meet the assembly space limitation condition.

[0040] In one optional connection mode of the flexible connection structure 1 and the load casing 107 and the bearing seat 108, the first connection end of the flexible connection structure 1 comprises a first matching stop 11 and a first bolt mounting edge 13, the first matching stop 11 is arranged in the circumferential direction of the first connection end, and the first bolt mounting edge 13 is connected with the load casing 107 through a first fastener 9. The second connection end of the flexible connection structure 1 comprises a second matching stop 12 and a second bolt mounting edge 14, the second matching stop 12 is arranged in the circumferential direction of the second connection end, and the second bolt mounting edge 14 is connected with the bearing seat 108 through a second fastener 10. The first fastener 9 and the second fastener 10 can be selected as bolts or screws. The connection mode of the stop and the fastener is more stable, can effectively withstand greater external force and torque, reduces the risk of loosening or falling off of the connection part, is convenient to install and disassemble, and has stronger adjustability, that is, the first matching stop 11, the first bolt mounting edge 13 and the second matching stop 12 and the second bolt mounting edge 14 between the flexible connection structure 1 and the load casing 107 and the bearing seat 108 are not easy to be separated.

[0041] In another optional connection mode, the first connection end of the flexible connection structure 1 is overlapped on the load casing 107, and the second connection end of the flexible connection structure 1 is overlapped on the bearing seat 108. The overlapping connection mode does not need to arrange a complex matching stop or other special structure at the connection part, simplifies the design and manufacturing process of the flexible connection structure 1, and reduces the production cost.

[0042] In still another optional connection mode, the flexible connection structure 1 and the load casing 107 are integrally formed, and the flexible connection structure 1 extends to the bearing seat 108, that is, the flexible connection structure 1 is a part of the load casing 107 extending inward. Alternatively, the flexible connection structure 1 and the bearing seat 108 are integrally formed, and the flexible connection structure 1 extends to the load casing 107, that is, the flexible connection structure 1 is a part of the bearing seat 108 extending outward. The integrally formed connection mode makes the flexible connection structure 1 and the load casing 107 or the bearing seat 108 form an integral whole, there is no connection interface, and the weak link that may exist at the connection part is eliminated, so that the strength and rigidity of the structure are greatly improved, and greater load and stress can be borne.

[0043] The rigidity of the flexible connection structure 1 of the utility model can be adjusted through the parameter characteristics of the bending part 6. The parameter characteristics of the bending part 6 include the bending angle, the rounding diameter and the number of the bending part 6. Figure 2 As shown in the figure, the plurality of bending parts 6 can have different bending angles, and the bending part 6 can have a rounding angle. The bending angle and the rounding diameter can be designed into any bending angle and rounding diameter as required.

[0044] The number of the bending part 6 can be designed into any number as required, and the utility model does not limit the number.

[0045] By changing the bending angle, the rounding diameter and the number of the bending portion 6, the flexible connecting structure 1 with different rigidity can be designed.

[0046] As shown in Figure 2 In one specific example, the number of the bending portion 6 is four, which are the first bending portion 2, the second bending portion 3, the third bending portion 4 and the fourth bending portion 5 connected in sequence. Figure 2 According to the utility model, the space occupied by the flexible connecting structure 1 with multiple bending portions can be smaller than that of the rigid connecting structure and the flexible connecting structure 1 without bending portion.

[0047] The material of the flexible connecting structure can be 2A70, GH4169, etc.

[0048] Optionally, the thickness of the flexible connecting structure is about 1-5mm.

[0049] In combination with the above embodiment, the flexible connecting structure of the utility model solves the problem that the local stress level of the connecting structure is too large, which leads to the problem that the connecting structure is too heavy.

[0050] Compared with the existing rigid connecting structure, the rigidity of the flexible connecting structure of the utility model is lower.

[0051] As can be seen from the above embodiments, the flexible connecting structure with the bending part can adjust and reduce the rigidity of the connecting structure, improve the deformation coordination ability between the connecting structure and the connected inner and outer layer stators, improve the connecting shoulder fitting ability between the connecting structure and the connected inner and outer layer stators, reduce the stress level of the connecting structure, make the stress distribution more uniform, improve the utilization rate of the connecting structure material, obtain a connecting structure with thinner thickness and smaller volume, and further reduce the weight of the aero-engine, improve the reliability and economic benefit of the aero-engine.

[0052] The utility model discloses although the above-mentioned preferable embodiment is disclosed, but it is not used to limit the utility model, and any person skilled in the art can make possible change and modification without departing from the spirit and scope of the utility model. Therefore, all the modifications, equivalent changes and modifications made to the above-mentioned embodiments according to the technical essence of the utility model, which do not deviate from the technical scheme of the utility model, all fall within the protection scope defined by the utility model claims.

Claims

1. A flexible connection structure for a turbine stator of an aeroengine for connecting a first stator member and a second stator member, characterized in that, The flexible connecting structure comprises a first connecting end, a second connecting end and a plurality of bending portions, wherein the first connecting end is configured to be connected to the first stator member, the second connecting end is configured to be connected to the second stator member, and the plurality of bending portions are connected in sequence. The first connecting end of the flexible connecting structure comprises a first matching stopper and a first bolt mounting edge, the first matching stopper is arranged in the circumferential direction of the first connecting end, and the first bolt mounting edge is connected to the first stator member by a fastener; and / or The second connecting end of the flexible connecting structure comprises a second matching stopper and a second bolt mounting edge, the second matching stopper is arranged in the circumferential direction of the second connecting end, and the second bolt mounting edge is connected to the second stator member by a fastener. The fastener is a bolt or a screw.

2. The flexible connection structure of claim 1, wherein The first connecting end of the flexible connecting structure is lapped on the first stator member; and / or The second connecting end of the flexible connecting structure is lapped on the second stator member.

3. The flexible connection structure of claim 2, wherein The flexible connecting structure and the first stator member are integrally formed, and the flexible connecting structure extends to the second stator member.

4. The flexible connection structure of claim 1, wherein The flexible connecting structure and the second stator member are integrally formed, and the flexible connecting structure extends to the first stator member. The bending angles of the plurality of bending portions are different; and / or 5. The flexible connection structure of claim 1, wherein The bending portions have rounded corners.

6. The flexible connection structure of claim 1, wherein The first stator member is an outer layer stator, the second stator member is an inner layer stator, the first end of the outer layer stator is connected to the first end of the inner layer stator by a support structure; 7. The flexible connection structure of any one of claims 1-6, wherein, The flexible connecting structure connects the second end of the outer layer stator and the second end of the inner layer stator. The outer layer stator is a force-bearing casing, and the inner layer stator is a bearing seat.

8. The flexible connection structure of any one of claims 1-6, wherein, The flexible connecting structure comprises a first bending portion, a second bending portion, a third bending portion and a fourth bending portion connected in sequence; The first bending portion is connected to the first connecting end, and the fourth bending portion is connected to the second connecting end.

9. The flexible connection structure of claim 8, wherein ​ 10. The flexible connection structure of any one of claims 1-6, wherein, ​ ​

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