A metal skeleton machine case with a composite material skin

Abstract

The application provides a metal framework case with a composite material skin, and belongs to the technical field of gas turbine aeroengines, and specifically comprises a metal framework and a cylinder body, the cylinder body is made of a composite material, the metal framework is sleeved on the outer periphery of the cylinder body, the metal framework comprises a hollow truss structure in a cylinder shape and flanges connected to the two ends of the hollow truss structure, the hollow truss structure in a cylinder shape is wrapped on the outer periphery of the cylinder body, and the metal framework is fixedly connected with the cylinder body through bonding. Through the processing scheme, the rigidity of the case structure is ensured, and the weight of the case is reduced.

Description

Technical Field

[0001] This application relates to the field of gas turbine aircraft engines, and in particular to a metal frame casing with a composite material skin. Background Technology

[0002] For aero engines, minimizing weight is always a priority, and weight reduction in the engine casing has been a key focus. To date, reinforced metal casings and composite material casings have been proposed. However, the weight reduction effect of reinforced metal casings is relatively limited. While composite material casings can meet weight reduction requirements, their structural connections and rigidity have consistently presented additional challenges to structural design. Summary of the Invention

[0003] In view of this, this application provides a metal frame casing with composite material skin, which solves the problems in the prior art, ensuring the structural rigidity of the casing while reducing the weight of the casing.

[0004] The technical solution provided in this application for a metal frame casing with composite material skin is as follows:

[0005] A metal frame housing with a composite material skin includes a metal frame and a cylindrical body. The cylindrical body is made of composite material. The metal frame is fitted around the outer periphery of the cylindrical body. The metal frame includes a cylindrical hollow truss structure and flanges connected to both ends of the hollow truss structure. The cylindrical hollow truss structure is wrapped around the outer periphery of the cylindrical body. The metal frame and the cylindrical body are fixedly connected by adhesive bonding.

[0006] Optionally, the hollow truss structure includes several parallel first beams, several second beams, and several third beams. The length direction of the first beams is parallel to the axis direction of the casing. The multiple first beams are evenly distributed around the circumference of the cylinder. The second and third beams are spirally distributed around the outer circumference of the cylinder. The second and third beams are arranged in opposite directions. The multiple second beams are equidistantly distributed, and the multiple third beams are equidistantly distributed.

[0007] Optionally, the metal frame is bonded to the cylinder using resin adhesive.

[0008] Optionally, the casing includes two opposing semi-rings that are joined together to form the cylinder.

[0009] Optionally, the cylinder has radially outward protruding flanges at both ends, the inner ring wall of the flange abuts against the flanges, the hollow truss structure is located between the two flanges, and the two end faces of the hollow truss structure abut against the opposite sides of the two flanges.

[0010] Optionally, two first beams are provided with protruding strips on the axial side of the cylinder, aligned with the two butt joints of the two semi-rings, and the protruding strips are located between the two butt joints of the two semi-rings.

[0011] Optionally, the inner ring wall of the flange is provided with opposing protrusions, the protrusions are aligned with the convex strip, and the flange is provided with a groove that mates with the protrusions, the protrusions being located between the groove and the butt joint of the two half-rings.

[0012] In summary, this application includes the following beneficial technical effects:

[0013] This application utilizes a composite material skin to significantly reduce the weight of the casing. A perforated truss structure serves as the metal skeleton surrounding the composite material skin. This truss structure forms a perforated grid of triangles, quadrilaterals, or hexagons, acting as the load-bearing component, thereby greatly reducing the amount of metal material used and lowering the casing weight. The thin-walled composite material skin is installed inside the metal skeleton, effectively isolating internal and external airflow and withstanding airflow pressure. Resin colloid is filled between the composite material skin and the metal skeleton to fill the gaps and seal the airflow. The combination of the composite material skin and the metal skeleton forms the casing, reducing its weight while maintaining structural rigidity. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of the metal frame casing with composite material skin of this application;

[0016] Figure 2 This is a structural schematic diagram of a partial cross-section of the casing of this application;

[0017] Figure 3 This is a schematic diagram of the flange structure of this application;

[0018] Figure 4 This is a schematic diagram of the structure of the cylinder in this application.

[0019] Explanation of reference numerals in the attached drawings: 1. Metal frame; 11. Hollowed-out truss structure; 12. Flange; 13. First beam; 14. Second beam; 15. Third beam; 16. Raised bar; 17. Raised block; 2. Cylinder; 21. Semi-ring; 22. Flange; 23. Groove; 3. Resin colloid. Detailed Implementation

[0020] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0021] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0023] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0024] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0025] This application provides a metal frame casing with a composite material skin.

[0026] like Figures 1-4As shown, a metal frame 1 housing with a composite material skin includes a metal frame 1 and a cylindrical body 2. The cylindrical body 2 is made of composite material. The metal frame 1 is fitted around the outer periphery of the cylindrical body 2. The metal frame 1 includes a cylindrical hollow truss structure 11 and flanges 12 connected to both ends of the hollow truss structure 11. The cylindrical hollow truss structure 11 wraps around the outer periphery of the cylindrical body 2. The metal frame 1 and the cylindrical body 2 are fixedly connected by adhesive bonding.

[0027] This application uses a composite material cylinder 2 as the skin, which can be made of polyethylene and carbon fiber composite material, significantly reducing the weight of the casing. A perforated truss structure 11 is used as the metal skeleton 1 to encase the composite material skin. The truss structure forms a perforated grid of triangles, quadrilaterals, or hexagons, serving as the load-bearing component, thereby greatly reducing the amount of metal material used and lowering the weight of the casing. The composite material skin, being thin-walled, is installed inside the metal skeleton 1, serving to isolate internal and external airflow and withstand airflow pressure. Resin colloid 3 is filled between the composite material skin and the metal skeleton 1 to fill the gap and seal the airflow. The composite material skin and the metal skeleton 1 combined form the casing, reducing its weight while ensuring structural rigidity.

[0028] The hollow truss structure 11 includes several parallel first beams 13, several second beams 14, and several third beams 15. The length direction of the first beams 13 is parallel to the axis of the casing. The multiple first beams 13 are evenly distributed around the circumference of the cylinder 2. The second beams 14 and third beams 15 are spirally distributed around the outer circumference of the cylinder 2, and the second beams 14 and third beams 15 are arranged in opposite directions. The multiple second beams 14 are equidistantly distributed, and the multiple third beams 15 are equidistantly distributed. The truss structure of this application intersects to form a triangular hollow, which can effectively ensure the structural rigidity of the metal frame 1 and reduce deformation under force.

[0029] The casing includes two opposing semi-rings 21, which are joined together to form the cylindrical body 2.

[0030] The cylindrical body 2 has radially outward protruding flanges 22 at both ends. The inner ring wall of the flange 12 abuts against the flanges 22. The hollow truss structure 11 is located between the two flanges 22, and the two end faces of the hollow truss structure 11 abut against the opposite inner sides of the two flanges 22. The composite material cylindrical body 2 is axially constrained. The composite material skin is a split cylindrical body 2 structure, with flanges 22 formed by outward flanges at both ends of the cylindrical body 2. After the metal frame 1 is installed, the flanges 22 can be engaged between the two end faces of the cylindrical hollow truss structure 11 of the metal frame 1, and the outer ring face of the flange 22 abuts against the inner ring face of the flange 12. It is worth noting that the composite material skin requires slight deformation to be installed into the metal frame 1, which is due to the slightly weaker rigidity of the composite material itself.

[0031] Aligned with the two butt joints of the two semi-rings 21, the two first beams 13 are provided with protruding strips 16 that protrude toward the axis of the cylinder 2, and the protruding strips 16 are located between the two butt joints of the two semi-rings 21.

[0032] The inner ring wall of the flange 12 is provided with opposing protrusions 17, which are aligned with the convex strip 16. The protrusions 17 are located at both ends of the convex strip 16. The flange 22 is provided with a groove 23 that mates with the protrusions 17. The groove 23 is located at the joint of the two half-rings 21. An L-shaped groove is provided on the flange 22 of each half-ring 21 near the joint. After the two half-rings 21 are joined, the two L-shaped grooves form the groove 23. The protrusions 17 are located between the groove 23 and the joint of the two half-rings 21. The side of the protrusions 17 fits against the groove 23 and the joint. The width of the part of the protrusions 17 in the groove 23 is greater than the width in the joint. Here, the width is understood as the length along the circumferential direction of the cylinder 2.

[0033] The metal frame 1 and the cylinder 2 are bonded together by resin colloid 3. Resin colloid 3 is filled between the metal frame 1 and the composite material skin. The resin colloid 3 has strong adhesion, fills the gap, and bonds the metal frame 1 and the composite material skin together.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A metal frame casing with a composite material skin, characterized in that, It includes a metal frame and a cylindrical body. The cylindrical body is made of composite material. The metal frame is fitted around the outer periphery of the cylindrical body. The metal frame includes a cylindrical hollow truss structure and flanges connected to both ends of the hollow truss structure. The cylindrical hollow truss structure is wrapped around the outer periphery of the cylindrical body. The metal frame and the cylindrical body are fixedly connected by adhesive bonding. The casing includes two opposing semi-rings, which are joined together to form the cylindrical body. Both ends of the cylindrical body have radially outwardly protruding flanges. The inner ring wall of the flange abuts against the flanges. The hollow truss structure is located between the two flanges, with its two end faces abutting against the opposite sides of the two flanges and aligned with the two joints of the two semi-rings. Two first beams have protruding strips extending towards the axis of the cylindrical body, located between the two joints of the two semi-rings. The inner ring wall of the flange has opposing protrusions aligned with the protruding strips. The flange has grooves that mate with the protrusions, located between the grooves and the joints of the two semi-rings.

2. The metal frame casing with composite material skin according to claim 1, characterized in that, The hollow truss structure includes several parallel first beams, several second beams, and several third beams. The length direction of the first beams is parallel to the axis of the casing. The multiple first beams are evenly distributed around the circumference of the cylinder. The second and third beams are spirally distributed around the outer circumference of the cylinder. The second and third beams are arranged in opposite directions. The multiple second beams are equidistantly distributed, and the multiple third beams are equidistantly distributed.

3. The metal frame casing with composite material skin according to claim 1, characterized in that, The metal frame is bonded to the cylinder with resin colloid.

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