Axial-flow type engine and air inlet cone thereof
By designing the air inlet cone with a mounting groove, so that the flow channel plate is in line contact with the air intake cone and has an avoidance chamber, the problem of difficulty in applying the composite flow channel plate in the engine is solved, and the load transfer area and the edge of the composite material are realized Isolation of effect areas extends component life and reduces engine weight.
Patent Information
- Application Number
- CN202310909719.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-21
- Publication Date
- 2025-01-21
AI Technical Summary
There are difficulties in the actual application of composite runner plates in existing engines. The main reason is that the geometry of the runner plates is constrained by the fan blade basin back profile and front and rear edge position, resulting in unbalanced installation structure and center of gravity, uneven stress distribution, which is easy to occur. Stress concentration and material edge defects.
Design an air inlet cone with mounting grooves on the inner periphery of the connecting end. The mounting edges of the flow channel plate are connected to the air inlet cone through these mounting grooves to form line contact and have an avoidance chamber to ensure that the load transfer area is connected to the edge of the composite material. Effect area isolation.
Through this design, the load transfer area is isolated from the edge effect area of the composite material, which reduces the degree of stress concentration, extends the service life of parts, reduces the need for maintenance and replacement, and is conducive to the economical use of the engine. By reducing the weight of the intake cone, the weight of the engine is reduced.
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Abstract
Description
Technical Field
[0001] The invention relates to the field of gas turbines, and in particular to an axial flow engine and an intake cone thereof. Background Art
[0002] The fan blades of high bypass ratio turbofan engines often use composite fan blades installed with a dovetail structure. Due to the use of composite materials, it is difficult for fan blades to use edge plate design in their own structure to realize the flow channel between blades. Therefore, it is necessary to use a fan blade flow plate structure to form the flow surface at the root of the blade. After the fan blades are assembled to the fan disk, the flow plate is filled into the space between the fan blades. The flow plate installation structure extends out front and back of the fan blade root, and cooperates with the front and rear fixing rings to realize the positioning of the flow plate. The front and rear fixing rings are also components of the flow surface of the front and rear rotors of the fan, and are fixed to the fan rotor through their respective assembly structures.
[0003] In order to adapt to the composite fan blades, the corresponding flow channel plates are also preferably made of composite materials. However, in existing engines, the practical application of composite flow channel plates is still difficult. Summary of the invention
[0004] The object of the present invention is to provide an intake cone, which can realize the application of a composite material flow channel plate in an engine.
[0005] To achieve the above-mentioned purpose, the air intake cone has a connection end connected to the flow channel plate, the inner periphery of the connection end is provided with at least one mounting groove, and the mounting edge of the flow channel plate is connected to the air intake cone through the mounting groove;
[0006] When the mounting edge is assembled in the mounting groove, an avoidance chamber is formed between the groove bottom of the mounting groove and each opposite side wall of the mounting edge, so that when the mounting edge abuts against the groove bottom of the mounting groove, there is line contact between the two.
[0007] In one or more embodiments, the bottom of the mounting groove is arc-shaped.
[0008] In one or more embodiments, the air intake cone further includes a first connecting portion extending from an inner side of the air intake cone toward the connecting end.
[0009] Another object of the present invention is to provide an axial flow engine, which comprises a blade disk, blades, a flow channel plate and an intake cone as described above;
[0010] The mounting edge of the flow channel plate is assembled and connected with the air inlet cone through the mounting groove, and the flow channel plate in the assembled state is limited by the blade and the connecting end of the air inlet cone.
[0011] In one or more embodiments, the flow channel plate is made of composite material.
[0012] In one or more embodiments, the flow channel plates are arranged in plurality between the blades, and the mounting grooves are opened in plurality along the inner circumference of the connecting end, corresponding to the number of the flow channel plates.
[0013] In one or more embodiments, the air intake cone is the air intake cone described above;
[0014] The blade disk has a second connection portion extending toward one side of the intake cone, and in an assembled state, the first connection portion is connected to the second connection portion.
[0015] In one or more embodiments, the first connecting portion and the second connecting portion respectively have through holes allowing fasteners to pass through, and the first connecting portion and the second connecting portion are fixedly connected by the fasteners.
[0016] The beneficial effects of the present invention are:
[0017] 1) By providing an intake cone with a mounting groove, the installation edge of the flow channel plate and the intake cone are in line contact in the assembled state, and there is an avoidance chamber between the two, so that the boundary of the load transfer generated under actual working conditions is moved from the edge of the flow channel plate to a position where the installation edge of the flow channel plate is a certain distance away from the edge of the part. Here, the edge of the part is the side wall of the installation edge for the installation edge of the flow channel plate. In this way, the load transfer area is isolated from the area affected by the edge effect of the composite material, so as to reduce the degree of stress concentration, extend the service life of the parts, reduce the need for maintenance and replacement, and benefit the economy of engine use.
[0018] 2) The mounting groove provided on the intake cone can reduce the weight of the intake cone, thereby reducing the weight of the engine.
[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:
[0021] Figure 1 A half-section schematic diagram of an axial flow engine according to some embodiments of the present application is shown;
[0022] Figure 2 A schematic diagram of the structure of the air intake cone and the flow channel plate installation according to some embodiments of the present application;
[0023] Figure 3 for Figure 2 A partial enlarged schematic diagram of
[0024] Figure 4 is a side schematic diagram of an intake cone according to some embodiments of the present application;
[0025] Figure 5 It is a half-section schematic diagram of an intake cone according to some embodiments of the present application. DETAILED DESCRIPTION
[0026] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.
[0028] In view of the difficulties in the practical application of composite flow plates in existing engines, the applicant further studied and found that, because the geometry of the flow plate is constrained by the contour of the fan blade back basin and the position of the leading and trailing edges, the installation structure of the flow plate cannot be completely balanced with its own center of gravity, and the stress distribution generated by the centrifugal force during operation is uneven at the installation structure. At the same time, the flow plate made of composite materials has an edge effect of composite materials due to the inherent properties of composite materials, which causes stress concentration at the edge of the geometric shape of the part, and is prone to defects such as delamination at the edge of the material. As the working time increases, the defects gradually expand, eventually leading to part failure.
[0029] The edge effect of laminate refers to the phenomenon of local interlaminar stress concentration at the free edge of a multi-directional laminate.
[0030] Based on the above findings, on the one hand, according to some embodiments of the present application, an axial flow engine is provided, see Figure 1 , Figure 1A half-section schematic diagram of an axial flow engine according to some embodiments of the present application is shown, wherein the axial flow engine includes an intake cone 1, a flow channel plate 2, blades 3 and a blisk 4, and also includes a fan casing 5, a boost stage 6 and a load-bearing casing 7.
[0031] On the other hand, according to some embodiments of the present application, an intake cone applied to the axial flow engine as described above is provided. To further explain the structure of the intake cone, please refer to Figure 2 as well as Figure 3 , Figure 2 is a schematic diagram of the structure of the air intake cone and the flow channel plate installation according to some embodiments of the present application, Figure 3 for Figure 2 The air inlet cone 1 has a connection end 10, through which the air inlet cone 1 contacts and is connected to the flow channel plate 2, at least one mounting groove 11 is formed on the inner periphery of the connection end 10, and the flow channel plate 2 has a mounting edge 20 connected to the air inlet cone 1, and the mounting edge 20 of the flow channel plate 2 is connected to the air inlet cone 1 through the mounting groove 11.
[0032] Among them, Figure 2 as well as Figure 3 As shown, the mounting edge 20 of the flow channel plate 2 is connected to the air intake cone through the mounting groove 11. When the mounting edge 20 is assembled in the mounting groove 11, an avoidance chamber 111 is formed between the groove bottom 110 of the mounting groove 11 and each opposite side wall 200 of the mounting edge 20, so that when the mounting edge 20 and the groove bottom 110 of the mounting groove 11 are against each other, there is a line contact between the two.
[0033] In the assembled state, the flow channel plate 2 is limited by the blades 3 and the intake cone 1 , that is, the flow channel plate 2 is limited in the radial direction of the engine by the outer edge of the blades 3 and the groove bottom 110 of the mounting groove 11 .
[0034] In the above description, it can be understood that the flow channel plate 2 is based on the structure of the existing flow channel plate, which has a mounting edge 20 of a plate-like structure, the cross-section of the mounting edge 20 is rectangular, and the side wall 200 of the mounting edge 20 is the side of the plate-like structure.
[0035] When the mounting edge 20 is placed in the mounting groove 11 and abuts against the bottom wall of the mounting groove 11, the inner contour of the mounting groove 11 is expanded outward and protrudes from the side wall 200 of the mounting edge 20, thereby defining an avoidance chamber 111 therebetween. Figure 2 as well as Figure 3 The structure shown in is for reference, and the side walls 200 disposed opposite to the mounting edge 20 and the mounting groove 11 are respectively the upper wall, left and right side walls and end surface side walls of the mounting edge 20 .
[0036] By providing the intake cone 1 with the mounting groove 11, the mounting edge 20 of the flow channel plate 2 and the intake cone 1 are in line contact in the assembled state, and there is an avoidance chamber between the two, so that the boundary of the load transfer generated under the actual working condition is moved from the edge of the flow channel plate to a position where the mounting edge of the flow channel plate is a certain distance away from the edge of the part. Here, the edge of the part is the side wall 200 of the mounting edge 20 for the mounting edge 20 of the flow channel plate 2. In this way, the load transfer area is isolated from the area affected by the edge effect of the composite material, so as to reduce the degree of stress concentration, extend the service life of the parts, reduce the need for maintenance and replacement, and benefit the economy of engine use.
[0037] At the same time, the mounting groove 11 provided on the intake cone 2 can reduce the weight of the intake cone 2, thereby reducing the weight of the engine.
[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0039] According to some embodiments of the present application, the groove bottom 110 of the mounting groove 11 is arc-shaped, that is, the contour of the groove bottom of the mounting groove 11 as a whole forms a part of the outer contour of the sphere. The mounting groove 11 with this configuration is easy to process, which simplifies the forming difficulty of the air intake cone 2.
[0040] In some other embodiments different from those shown in the figures, the mounting groove 11 may also have other suitable configurations capable of forming an avoidance chamber, such as a V-shaped groove structure, which can also form an avoidance chamber between the groove bottom wall and the mounting edge.
[0041] See also Figure 4 , Figure 4 It is a side schematic diagram of an intake cone according to some embodiments of the present application, wherein the flow channel plates 2 are arranged in plurality between the blades 3, and the mounting grooves 11 are opened in plurality along the inner circumference of the connecting end 10 corresponding to the number of the flow channel plates 2 as shown in the figure.
[0042] See also Figure 5 , Figure 5 It is a half-section schematic diagram of an intake cone according to some embodiments of the present application, wherein the intake cone 1 further includes a first connecting portion 12 , and the first connecting portion 12 extends from the inner side of the intake cone 1 toward the connecting end 10 .
[0043] The blade disk 4 has a second connection portion 41 extending toward one side of the intake cone 1 . In the assembled state, the first connection portion 12 is connected to the second connection portion 41 to achieve a fixed connection between the blade disk 4 and the intake cone 1 .
[0044] Further, according to some embodiments of the present application, the first connection portion 12 and the second connection portion 41 respectively have through holes allowing fasteners to pass through, and the first connection portion 12 and the second connection portion 41 are connected by fasteners. In a specific embodiment, the fasteners are bolts and nuts.
[0045] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.
[0046] In the description of the embodiments of the present application, “plurality” means more than two, unless otherwise clearly and specifically defined.
[0047] According to some embodiments of the present application, the flow channel plate 2 is made of composite material.
[0048] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", and "radial" is based on the orientation or position relationship of the connecting component in the connected state. It is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.
[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. An air inlet cone having a connection end connected to a flow channel plate, characterized in that: At least one mounting groove is formed on the inner periphery of the connecting end, and the mounting edge of the flow channel plate is connected to the air inlet cone through the mounting groove; When the mounting edge is assembled in the mounting groove, an avoidance chamber is formed between the groove bottom of the mounting groove and each opposite side wall of the mounting edge, so that when the mounting edge abuts against the groove bottom of the mounting groove, there is line contact between the two.
2. The air inlet cone according to claim 1, characterized in that The bottoms of the installation grooves are all arc-shaped.
3. The air inlet cone according to claim 1, characterized in that: The air intake cone further includes a first connecting portion extending from the inner side of the air intake cone toward the connecting end.
4. An axial flow engine, characterized in that: It comprises a blade disk, blades, a flow channel plate and an intake cone as claimed in any one of claims 1 to 3; The mounting edge of the flow channel plate is assembled and connected with the air inlet cone through the mounting groove, and the flow channel plate in the assembled state is limited by the blade and the connecting end of the air inlet cone.
5. The axial flow engine according to claim 4, characterized in that: The flow channel plate is made of composite material.
6. The axial flow engine according to claim 4, characterized in that: The flow channel plates are arranged in plurality between the blades, and the mounting grooves are opened in plurality along the inner circumference of the connection end, corresponding to the number of the flow channel plates.
7. The axial flow engine according to claim 4, characterized in that: The air intake cone is the air intake cone as claimed in claim 3; The blade disk has a second connection portion extending toward one side of the intake cone, and in an assembled state, the first connection portion is connected to the second connection portion.
8. The axial flow engine according to claim 7, characterized in that: The first connection part and the second connection part respectively have through holes allowing fasteners to pass through, and the first connection part and the second connection part are fixedly connected by the fasteners.