WO2023227126A1

WO2023227126A1 - Turbine outer ring connection structure and turbine engine

Info

Publication number: WO2023227126A1
Application number: PCT/CN2023/096674
Authority: WO
Inventors: 郭洪宝; 蒋婷; 王子媛; 洪智亮
Original assignee: 中国航发商用航空发动机有限责任公司
Priority date: 2022-05-27
Filing date: 2023-05-26
Publication date: 2023-11-30
Also published as: CN117167101A

Abstract

A turbine outer ring connection structure comprises a turbine outer ring, a middle-layer casing and a plurality of connection assemblies, wherein each connecting assembly comprises an elastic beam and a connection piece, the bottom of the elastic beam comprises an abutting part, and the abutting part abuts against an outer surface of the middle-layer casing so that a gap exists between other parts of the elastic beam and the middle-layer casing. A column body at one end of the connection piece passes out of the inner side of the middle-layer casing and is fixedly connected to the elastic beam via through holes in the middle-layer casing and the elastic beam, and the other end of the connection piece is connected to the turbine outer ring. The elastic beam provides stable pre-tightening force for the connection piece and the turbine outer ring by means of deformation, and the gap between the elastic beam and the middle-layer casing is used for absorbing the thermal deformation generated by the engine in the radial direction.

Description

A turbine outer ring connection structure and turbine engine

Technical field

The invention belongs to the field of aerospace engines, and specifically relates to a turbine outer ring connection structure and a turbine engine.

Background technique

As the main high-temperature component of the gas turbine engine, the turbine outer ring has to withstand high ambient temperatures during service. Conventional high-temperature alloy materials have become increasingly difficult to meet design needs. Therefore, more and more aeroengines use ceramic matrix composites (CMC) instead of high-temperature alloys to manufacture turbine outer rings. However, the physical properties of the ceramic matrix composite turbine outer ring and the metal middle casing are quite different, and obvious thermal deformation mismatch problems will occur during service, affecting the safety and reliability of the connection structure. Some existing outer ring connection structures absorb part of the thermal deformation by arranging elastic washers on the fixed surfaces of the bolts. However, the washers themselves are also affected by temperature. At the same time, temperature changes can easily cause the washers to expand and contract repeatedly, causing the bolt pre-tightening force to decline. Relaxation occurs. Therefore, it is very meaningful to provide a turbine outer ring connection structure that can effectively absorb thermal deformation to improve engine reliability.

Contents of the invention

The object of the present invention is to provide a turbine outer ring connection structure that can effectively absorb the thermal deformation of the turbine outer ring and the middle casing. The invention also provides a turbine engine.

According to an aspect of an embodiment of the present invention, a turbine outer ring connection structure is provided, including a turbine outer ring, a middle casing and a plurality of connection components, wherein: the middle casing is circumferentially provided with at least one row penetrating along the radial direction of the engine. The installation through hole of the middle casing; the connection assembly includes an elastic beam and a connecting piece; at least two installation holes are provided through the surface of the elastic beam, and the positions of the installation holes are respectively corresponding to those on the middle casing. The adjacent mounting through holes are aligned; the bottom of the elastic beam is provided with a contact portion between the two adjacent mounting holes, which contacts the outside of the middle casing; one end of the connecting piece is configured as a column body, passes through the inner side of the middle casing and passes through the mounting through hole and the mounting hole, and is fixedly connected to the elastic beam; the other end of the connecting piece is configured as a connecting structure for connecting the outer shell of the turbine ring; the elastic beam provides a stable pre-tightening force for the connection between the connecting piece and the outer ring of the turbine through elastic deformation. In addition to the abutment part, there is a certain gap between the elastic beam and the middle casing. The gap Used to absorb thermal deformation generated along the radial direction of the engine.

Since the bottom of the elastic beam is provided with a protrusion, the elastic beam undergoes elastic deformation during assembly, causing the installation hole area to There is a certain gap between the elastic beam in the domain and the middle casing, which is used to absorb the thermal deformation generated along the radial direction of the engine and improve the stability of the connection structure under engine operating conditions; at the same time, the elasticity of the elastic beam can be adjusted at different temperatures and It provides a stable pre-tightening force for the connecting mechanism under thermal deformation to prevent fasteners from loosening or causing harmful vibrations caused by temperature changes. This connection structure does not require complicated processing of the turbine outer ring. It only needs to provide connection through holes at appropriate positions, and the effective connection between the turbine outer ring and the middle casing can be achieved through the connection assembly.

Further, the turbine outer ring includes a mounting rib protruding outward along the circumferential direction of the engine, and a connecting through hole along the axial direction of the engine is provided on the mounting rib; the connecting structure of the connecting piece is configured as U-shaped fork arm to allow the mounting rib of the turbine outer ring to be inserted into the U-shaped fork arm; the U-shaped fork arm includes a first arm and a second arm, and the first arm is provided with a first pin hole, the second arm is provided with a second pin hole coaxial with the first pin hole to allow a connecting pin to be inserted through the first pin hole and the connecting through hole in sequence into the third pin hole. two pin holes to fix the turbine outer ring and the connecting piece together. This structure only needs to open a connecting through hole on the turbine outer ring to effectively realize the connection of the turbine outer ring, without the need for complex structural processing of the turbine outer ring, which improves production efficiency and reduces processing difficulty.

Further, a positioning groove is provided on the outside of the middle casing, and the positioning groove is provided between two adjacent installation through holes to allow the protruding portion of the elastic beam to be clamped on the In the positioning groove, the adjacent mounting holes on the elastic beam are aligned with the two adjacent mounting through holes. Positioning grooves facilitate quick positioning of the elastic beam during assembly.

Further, there are two mounting holes on the elastic beam, and the mounting holes are provided at both ends of the elastic beam. Providing installation holes at both ends of the elastic beam can fully utilize the elasticity of the elastic beam itself and facilitate installation.

Further, the middle casing is provided with two rows of mounting through holes, and the turbine outer ring includes first mounting ribs and second mounting ribs arranged in parallel. Two rows of mounting ribs can provide a more stable positioning of the turbine outer ring and prevent the axis of the turbine outer ring from being offset from the engine axis.

Further, the first mounting rib is clamped in the U-shaped fork arm to form a position along the engine axial direction, and the second mounting rib and the connecting piece are configured to have a clearance fit. The first mounting rib provides positioning of the turbine outer ring along the engine's axial direction to prevent the turbine outer ring from moving forward and backward; the second mounting rib and the connector adopt a clearance fit to absorb thermal deformation along the engine's axial direction.

Further, the turbine outer ring includes a plurality of circumferentially arranged outer ring single pieces, and a mounting rib of each outer ring single piece includes at least two connecting through holes, and one of the connecting through holes is configured as round holes, and the remaining connecting through holes are configured as track holes with their long axis along the direction of the connecting line between the centers of the connecting through holes. The circular hole provides positioning of the turbine outer ring along the circumferential direction of the engine, and the raceway hole is used to absorb thermal deformation along the circumferential direction of the engine.

Furthermore, the inner surface of the middle casing is provided with a positioning structure that matches the contour of the connecting piece to allow the connecting piece to be snapped into the positioning structure from the inside, so that the axis of the turbine outer ring is aligned with the engine shaft. to parallel. The positioning structure helps the connectors to be quickly positioned and installed.

Further, the first pin hole is configured as a through hole, and the second pin hole is configured as a blind hole. The second pin hole is configured as a blind hole to prevent the connecting pin from falling off during assembly.

Further, a vent hole is provided at the end of the second pin hole. The vent hole is used to prevent the air pressure in the blind hole from impeding the insertion of the connecting pin.

According to another aspect of the embodiment of the present invention, a turbine engine is provided, adopting the turbine outer ring connection structure in any of the foregoing embodiments.

Description of the drawings

Figure 1 is a schematic diagram of the turbine outer ring connection structure in an embodiment;

Figure 2a is a schematic diagram of the partial structure of the middle casing in an embodiment;

Figure 2b is a schematic diagram of the partial structure of the middle casing in an embodiment;

Figure 3 is a schematic diagram of the single-piece structure of the outer ring in an embodiment;

Figure 4 is a schematic structural diagram of an elastic beam in an embodiment;

Figure 5a is a schematic structural diagram of a connector in an embodiment;

Figure 5b is a cross-sectional view of the connector in an embodiment;

Figure 6 is a cross-sectional view of the turbine outer ring connection structure along the longitudinal section of the engine in one embodiment;

Figure 7 is a cross-sectional view of the turbine outer ring connection structure along the engine in one embodiment.

The meaning of the reference symbols:
1-Single piece of outer ring; 2-Single piece of middle casing; 3-Connection assembly; 11-Outer ring wall; 12-First installation rib;
13-Second installation rib; 14-round hole; 15-runway hole; 21-middle casing ring wall; 22-ring wall flange; 23-middle casing hook; 24-installation through hole; 25-positioning recess Slot; 26-positioning structure; 31-elastic beam; 32-connector; 33-connecting pin; 34-fixing nut; 311-mounting hole; 312-bulge; 321-bolt column; 322-first arm; 323 - the second arm; 324 - the first pin hole; 325 - the second pin hole; 326 - the ventilation hole.

The purpose of the above-mentioned drawings is to illustrate the present invention in detail so that those skilled in the art can understand the technical concept of the present invention, but they are not intended to limit the present invention. For the sake of simplicity of expression, the above-mentioned drawings only schematically illustrate the structures related to the technical features of the present invention, and do not draw complete parts and all details strictly in accordance with the actual scale.

Detailed ways

The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment herein. The appearances of this phrase in various places in the specification are not necessarily referring to the same embodiment, nor are they limited to mutually exclusive separate or alternative embodiments. Those skilled in the art will be able to understand that the embodiments herein may be combined with other embodiments without structural conflict.

In the description of this article, unless otherwise explicitly stipulated and limited, the technical terms "installation", "connection", "connection", etc. should be understood in a broad sense. For example, it can refer to the connection of a mechanical structure, or it can also refer to the fixation and connection of a physical structure. Assemble. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

In the description of this article, terms indicating orientation or positional relationships such as "upper", "lower", "left", "right", "horizontal", "vertical", "height", "length", "width" are intended to be accurate. The description of the embodiments and the simplified description are not intended to limit the parts or structures involved to have a specific orientation, be installed or operate in a specific orientation, and should not be construed as limitations on the embodiments herein.

In the description of this article, terms such as "first" and "second" are only used to distinguish different directions and cannot be understood to indicate the relative importance or limit the number, specific order or primary and secondary relationship of the described technical features. In the description of this article, "multiple" means at least two.

According to one embodiment of the present invention, a turbine outer ring connection structure is provided. As shown in Figure 1, it includes a middle casing and a turbine outer ring connected through a connecting assembly 3, wherein the turbine outer ring and the middle casing are respectively composed of multiple It is surrounded by an outer ring single piece and a middle receiver single piece.

The structure of the middle casing single piece 2 is shown in Figures 2a and 2b. With the middle casing ring wall 21 as the boundary, the upper part of the middle casing single piece 2 forms the outside of the middle casing. The middle casing hook 23 is used to hold the middle casing. The middle casing is installed on the engine; the lower part of the middle casing single piece 2 forms the inner side of the middle casing, and the ring wall flange 22 matches the corresponding structure of the turbine outer ring. Two pairs of installation through holes 24 are respectively provided on the outer surface of the middle casing ring wall 21 close to the middle casing hook 23. The installation through holes 24 penetrate the middle casing ring wall 21 along the radial direction of the middle casing or the engine radial direction. In the middle casing surrounded by a plurality of middle casing single pieces 2, these two pairs of mounting through holes 24 respectively constitute two rows of through holes arranged in parallel along the circumferential direction of the engine. In some embodiments, the number of mounting through holes 24 can be set to two or more according to the structural design of the casing, and the number of columns of the mounting through holes 24 can be set to one or more than two columns; in some embodiments, the number of mounting through holes 24 in the same column can be set to two or more. A contacted portion 25 is provided between two adjacent mounting through holes 24. One embodiment of the contacted portion 25 is a positioning groove; in some embodiments, on the inner surface of the middle casing ring wall 21, A positioning structure 26 is also provided. The position of the positioning structure 26 corresponds to the mounting through hole 24. With reference to Figure 5a and Figure 5b, the positioning structure 26 matches the outline of the connecting piece 32. When the connecting piece 32 fits the positioning structure 26 In the middle, The axes of the first pin hole 324 and the second pin hole 325 are parallel to the engine axial direction, so that the axis of the turbine outer ring is also parallel to the engine axial direction.

The structure of the outer ring single piece 1 is shown in Figure 3. The upper part of the outer ring wall 11 forms the outside of the turbine outer ring. The outer side of the outer ring single piece 1 is provided with protruding first mounting ribs 12 and second mounting ribs. Plate 13, the first mounting rib 12 and the second mounting rib 13 respectively form two rib rings protruding outward along the circumferential direction of the engine. On the first mounting rib 12 and the second mounting rib 13, two connecting through holes are respectively provided along the engine axial direction, one of which is a circular hole 14, and the other is a long axis along the direction of the center line of the connecting through hole. The runway has 15 holes. During assembly, each connecting through hole corresponds one-to-one with the mounting through hole 24 on the middle casing. In some embodiments, the outer ring single piece can also be connected to the connecting component 3 through a hook structure. In some embodiments, depending on the structural design, the outer ring may be provided with only one mounting rib or multiple mounting ribs; in some embodiments, the same mounting rib may be provided with one or more Connection through holes; in some embodiments, two or more long holes may be provided on the same mounting rib.

With reference to FIG. 4 , FIG. 5 a and FIG. 6 , the connecting component 3 includes an elastic beam 31 and a connecting piece 32 . One end of the connector 32 is a bolt post 321. The bolt post 321 passes through the mounting through hole 24 from the inside of the middle casing ring wall 21, and passes through the mounting hole 311 on the elastic beam 31 provided on the outside of the middle casing ring wall 21. It is tightened and fixed by the fixing nut 34; the other end of the connector 32 is a connection structure configured as a U-shaped fork arm including a first arm 322 and a second arm 323, a first outer ring rib 12 and a second outer ring rib. The plates 13 are each inserted into the corresponding U-shaped fork arm and fixed by the connecting pin 33 passing through the connecting through hole. In this way, the turbine outer ring is connected to the middle casing. In some embodiments, the connection structure of the connector 32 can also be configured as a hook or a claw according to the structural design of the outer ring single piece, and the bolt column 321 can also be configured as a rivet or a columnar elastic claw with a barb, etc. Other fixed structures. It can be understood that in specific embodiments, depending on the specific structures of the outer ring single piece 1 and the middle casing single piece 2, the parts structures involved in the above connection relationship will be different.

As shown in Figure 4, during installation, the bottom of the elastic beam 31 can contact the outside of the middle casing ring wall 21; the bottom of the elastic beam 31 is provided with a contact portion 312, and one example of the contact portion 312 is a protruding portion. , a mounting hole 311 is provided at each end. When the abutting portion 312 is engaged in the contacted portion 25 , the two mounting holes 311 are respectively aligned with the mounting through holes 24 on the middle casing unit 21 . In some embodiments, the elastic beam 31 may be provided with multiple mounting holes 311. In the installed state, these mounting holes 311 are respectively aligned with the mounting through holes 24 on the middle casing unit 21, and two adjacent mounting holes are aligned with each other. A contact portion 312 is respectively provided between 311 . In all embodiments, the structure of the elastic beam 31 should match the structural design of the mid-level receiver.

As shown in FIGS. 5a and 5b , the first arm 322 of the connecting member 32 is provided with a first pin hole 324 that passes through it, and the second arm 323 is provided with a second pin hole 325 with a blind hole. The blind hole of the second pin hole 325 is A ventilation hole 326 is provided at the end of the hole. With reference to Figure 6, during the insertion process of the connecting pin 33, the blind hole end of the second pin hole 325 can prevent the connecting pin from sliding out, improving assembly efficiency; and the ventilation hole 326 can prevent the air pressure in the blind hole from hindering the insertion of the connecting pin 33. . In some embodiments, the second pin hole 325 can also be configured as a through hole; in other embodiments, for example, when an air guide groove is provided on the connecting pin 33, the end of the second pin hole 325 serves as a blind hole. The vent hole 326 may not be provided.

In the installed state, as shown in Figure 7, since the bottom of the elastic beam 31 is provided with a contact portion 312, there will be a certain gap between other areas of the bottom surface of the elastic beam 31 and the outer surface of the middle casing ring wall 21. When fixed, When the nut 34 is tightened, the elastic beam 31 will undergo a certain elastic deformation with the contact position as the fulcrum, providing pre-tightening force for the fixing nut 34 . At different temperatures, parts undergo thermal expansion, and the gap between the elastic beam 31 and the middle casing ring wall 21 can absorb the strain along the radial direction of the engine caused by thermal expansion; the elastic beam 31 maintains the predetermined position of the fixing nut 34 through its own elasticity. The tightening force should be relatively constant to prevent the fixing nut 34 from loosening. The positioning pin 33 is inserted into the circular hole 14 provided on the first mounting rib 12 of the outer ring single piece 1 to provide the outer ring single piece 1 with positioning along the circumferential direction of the engine; and after the positioning pin 33 is inserted into the raceway hole 15, the positioning pin 33 is inserted into the raceway hole 15. There is a certain gap in the long axis direction of 15, which can absorb the deformation along the circumferential direction of the engine when the parts undergo thermal expansion. As shown in Figure 6, the first mounting rib 12 is tightly clamped in the U-shaped fork arm of the connecting assembly 3 to provide the outer ring single piece 1 with positioning along the engine axial direction; while the second mounting rib 13 is connected to the The U-shaped fork arm of 3 has a clearance fit, which can absorb the deformation along the engine axis when the parts undergo thermal expansion. The clearance fit can be achieved by setting the second mounting rib 13 to a smaller thickness or by changing the corresponding U This is achieved by setting the fork arms to a larger width. In some embodiments, the outer ring single piece 1 has only one mounting rib, and the mounting rib is in transitional fit with the connecting component 3; in other embodiments, the outer ring single piece 1 has multiple mounting ribs, Then one of the mounting ribs is tightly clamped in the connecting component 3 to provide axial positioning, and the others are a clearance fit.

As shown in the embodiment shown in Figures 1 to 7, the assembly process of the turbine outer ring connection structure is as follows: First, the first mounting rib 12 and the second mounting rib 13 of the outer ring single piece 1 are clamped at the corresponding positions. Connect the U-shaped fork arm of the connector 32, and insert the connecting pin 33 through the first pin hole 324 and the connecting through hole on the mounting rib into the second pin hole 325 to complete the fixation. Next, pass the bolt post 321 of the connecting member 32 from the inside of the middle casing unit 2 through the installation through hole 24, and at the same time make the outline of the connecting member 32 fit to the positioning structure 26 on the inside of the middle casing unit 2. middle. On the outside of the middle casing unit 2, engage the contact portion 312 of the elastic beam 31 into the contacted portion 25, insert the bolt column 321 from the mounting hole 311 of the elastic beam 31, and tighten the fixing nut 34 On the bolt column 321, adjust the fixing nuts 34 at both ends of the elastic beam 31 to prevent the elastic beam 31 from tilting to one side to complete the fixation. As a result, the outer ring of the engine turbine and the middle casing are connected and fixed. This connection structure can effectively absorb the thermal deformation in the radial, circumferential and axial directions of the engine and improve the reliability of the engine. It should be understood that in different embodiments, depending on Depending on the structure of the relevant parts, the specific steps of the above process and the connection relationship between the parts may be different.

According to another embodiment of the present invention, a turbine engine is provided, adopting the turbine outer ring connection structure in any of the above embodiments.

The purpose of the above embodiments is to describe the implementation of the present invention in detail in conjunction with the drawings so that those skilled in the art can understand the technical concept of the present invention, and is not intended to limit the present invention. Within the scope of the claims of the present invention, optimizing or equivalently replacing the part structures involved, as well as combining the implementation modes in different embodiments without conflicting structures and principles, all fall within the scope of the present invention. protected range.

Claims

A turbine outer ring connection structure includes a turbine outer ring, a middle casing and multiple connection components, and is characterized by:

The middle casing is circumferentially provided with at least one row of mounting through holes that radially penetrate the middle casing;

The connection components include:

Elastic beam, the surface of the elastic beam is provided with at least two installation holes, and the positions of the installation holes are respectively aligned with the adjacent installation through holes on the middle casing; the bottom of the elastic beam is on the two adjacent ones. A contact portion is provided between the mounting holes, and the contact portion abuts on the outside of the middle casing;

Connector, one end of the connector is configured as a column, penetrates from the inside of the middle casing and passes through the installation through hole and the installation hole, and is fixedly connected to the elastic beam, and the other end of the connector Configuring a connecting structure connecting the turbine outer ring;

Among them, the elastic beam provides a stable pre-tightening force for the connection between the connecting piece and the turbine outer ring through elastic deformation. In addition to the abutment part, there is a gap between the elastic beam and the middle casing. The gap is used for Absorbs thermal deformation generated along the radial direction of the engine.
The turbine outer ring connection structure according to claim 1, characterized in that the turbine outer ring includes a mounting rib protruding outward along the engine circumferential direction, and the mounting rib is provided with a connection along the engine axial direction. through hole;

The connection structure of the connector is configured as a U-shaped fork arm to allow the mounting rib of the turbine outer ring to be inserted into the U-shaped fork arm; the U-shaped fork arm includes a first arm and a second arm. , the first arm is provided with a first pin hole, and the second arm is provided with a second pin hole coaxial with the first pin hole to allow a connecting pin to pass through the first pin hole, The connecting through hole is inserted into the second pin hole to fix the turbine outer ring and the connecting piece together.
The turbine outer ring connection structure according to claim 1 or 2, wherein the contact portion of the elastic beam is a convex portion, and a positioning groove is provided on the outside of the middle casing, and the positioning groove is A groove is provided between two adjacent mounting through holes to allow the protruding portion of the elastic beam to be clamped in the positioning groove, so that the adjacent mounting holes on the elastic beam are in contact with each other. The two adjacent mounting through holes are aligned respectively.
The turbine outer ring connection structure according to claim 1 or 2, characterized in that there are two mounting holes on the elastic beam, and the mounting holes are provided at both ends of the elastic beam.
The turbine outer ring connection structure according to claim 2, wherein the middle casing is provided with two rows of mounting through holes, and the turbine outer ring includes a first mounting rib and a second mounting rib arranged in parallel. .
The turbine outer ring connection structure according to claim 5, wherein the first mounting rib is clamped in the U-shaped fork arm to form a positioning connection along the engine axial direction, and the second mounting rib is The plate and the connector are configured for a clearance fit.
The turbine outer ring connection structure according to claim 2, wherein the turbine outer ring includes a plurality of circumferentially arranged outer ring single pieces, and a mounting rib of each outer ring single piece includes at least Of the two connecting through holes, one of the connecting through holes is configured as a circular hole, and the other connecting through holes are configured as track holes with their long axis along the direction of the center line of the connecting through holes.
The turbine outer ring connection structure according to claim 1 or 2, characterized in that the inner surface of the middle casing is provided with a positioning structure that matches the contour of the connecting piece to allow the connecting piece to be clamped from the inside. When connected to the positioning structure, the axis of the turbine outer ring is parallel to the engine axial direction.
The turbine outer ring connection structure according to claim 2, wherein the first pin hole is configured as a through hole, and the second pin hole is configured as a blind hole.
The turbine outer ring connection structure according to claim 9, characterized in that a vent hole is provided at the end of the second pin hole.
A turbine engine adopts the turbine outer ring connection structure according to any one of claims 1 to 10.