Fiber winding integrally-formed shell with skirt

Abstract

The invention provides a fiber winding integrally-formed shell with a skirt. The fiber winding integrally-formed shell comprises an inner container, a shell and a skirt structure. Wherein the inner container is fixedly arranged in the shell, the skirt structures are arranged at the two ends of the shell, and the skirt structures and the shell are integrally formed; the shell is provided with a cylindrical middle section structure and first closing-up structures located on the two sides of the middle section structure, and first openings are formed in the two ends of the shell. The outer wall of the inner container is attached to the inner wall of the shell, second openings are formed in the two ends of the inner container, and the first opening and the second openings are coaxially arranged; the skirt structure is of an annular thin-wall structure, one end of the skirt structure is connected with the edge of the middle section structure of the shell, and the circumferential size of the skirt structure is smaller than or equal to that of the middle section structure. The skirt structure and the shell are integrally formed, so that the problem of stress concentration caused by traditional glue joint is avoided, and the structural reliability is improved; the shell and the skirt structure are integrally formed through the fiber winding technology, the machining steps and the mold cost are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aeroengines, and particularly to a fiber-wound integrally formed skirted shell. Background Art

[0002] The shell of an aeroengine combustion chamber generally consists of a cylindrical body, a front head, a rear head, a front skirt, a rear skirt, a front joint and a rear joint. The fiber-wound shell usually makes the head and the cylinder body into a whole, and is wound with a fiber bundle impregnated with resin on the mandrel of a winding machine. There are three basic winding methods: planar winding, circumferential winding and helical winding.

[0003] In the prior art, the outer shell and the skirt structure are separately arranged. Usually, after the outer shell is helically wound, a metal skirt or a composite skirt is installed, and then circumferential winding is carried out to form an integral shell structure. Since the outer shell and the skirt structure are not integrally formed, there are problems such as inability to transfer loads, stress concentration at the transition position and poor tear resistance. Therefore, there is an urgent need for a fiber-wound integrally formed skirted shell to solve these problems. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a fiber-wound integrally formed skirted shell to eliminate or improve one or more defects existing in the prior art.

[0005] The present invention provides a fiber-wound integrally formed skirted shell, including an inner liner, an outer shell and a skirt structure;

[0006] Wherein, the inner liner is fixedly arranged inside the outer shell, the skirt structure is arranged at both ends of the outer shell and the skirt structure is integrally formed with the outer shell;

[0007] The outer shell has a cylindrical middle section structure and first necking structures located on both sides of the middle section structure, and both ends of the outer shell have first openings;

[0008] The outer wall of the inner liner is attached to the inner wall of the outer shell, both ends of the inner liner have second openings, and the first openings and the second openings are coaxially arranged;

[0009] The skirt structure is an annular thin-walled structure, one end of the skirt structure is connected to the edge of the middle section structure of the outer shell, and the circumferential dimension of the skirt structure is less than or equal to the circumferential dimension of the middle section structure.

[0010] In one embodiment, the end of the skirt structure away from the outer shell has a second necking structure for forming a composite connection interface.

[0011] In one embodiment, the inner end face of the composite connection interface is flush with the end of the outer shell.

[0012] In one embodiment, an arc chamfer is provided on the outer side of the second closing structure.

[0013] In one embodiment, the fiber-wound integrally formed skirted housing further includes a metal connection joint. The metal connection joint is fixedly connected to one end of the skirt structure away from the outer shell, and a metal connection interface is provided in the middle of the metal connection joint.

[0014] In one embodiment, the metal connection joint is of a rotary structure. The metal connection joint includes an inner ring body and an outer ring body. The inner ring body and the outer ring body are fixedly connected. The circumferential dimension of the inner ring body is smaller than that of the skirt structure, and the circumferential dimension of the outer ring body is larger than that of the skirt structure. The outer wall of the inner ring body is fixedly connected to the skirt structure.

[0015] In one embodiment, the fiber-wound integrally formed skirted housing further includes a first forming tooling. The first forming tooling is detachably connected to the outer shell, and the first forming tooling has a first arc-shaped surface that is adapted to the inner surface of the skirt structure.

[0016] In one embodiment, the fiber-wound integrally formed skirted housing further includes a second forming tooling. The second forming tooling is detachably connected to the outer shell, and the outer surface of the second forming tooling has a second arc-shaped surface and a closing-shaped surface that are connected in sequence. The second arc-shaped surface and the closing-shaped surface are adapted to the inner surface of the skirt structure.

[0017] The fiber-wound integrally formed skirted housing in the embodiments of the present invention has the following technical effects: The inner liner and the outer shell are designed to fit together, which can ensure uniform pressure distribution, reduce local stress concentration, and improve the overall compressive capacity; The skirt structure and the outer shell are integrally formed, avoiding the stress concentration problem caused by traditional adhesive bonding and improving the structural reliability; The outer shell and the skirt structure are integrally formed through the fiber winding technology, reducing the processing steps and mold costs and improving the production efficiency.

[0018] The additional advantages, objects, and features of the present invention will be partially described below, and will become partially apparent to those of ordinary skill in the art after studying the following text, or can be learned from the practice of the present invention. The objects and other advantages of the present invention can be achieved and obtained by the structure specifically pointed out in the specification and the drawings.

[0019] Those skilled in the art will understand that the objects and advantages that can be achieved by the present invention are not limited to the above specifically described, and the above and other objects that the present invention can achieve will be more clearly understood according to the following detailed description. Description of the Drawings

[0020] The accompanying drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and do not limit the present invention. The components in the drawings are not drawn to scale, but are only for showing the principles of the present invention. To facilitate showing and describing some parts of the present invention, corresponding parts in the drawings may be enlarged, that is, may become larger relative to other components in the exemplary device actually manufactured according to the present invention.

[0021] Figure 1 It is a schematic cross-sectional structure diagram of a fiber-wound integrally formed skirted housing in an embodiment of the present invention.

[0022] Figure 2 It is a schematic cross-sectional structure diagram of a fiber-wound integrally formed skirted housing in another embodiment of the present invention.

[0023] Figure 3 It is a schematic structure diagram of a second forming tooling in an embodiment of the present invention.

[0024] Figure 4 It is a schematic structure diagram of a first forming tooling in another embodiment of the present invention.

[0025] Reference numerals: 1, inner liner; 2, outer shell; 3, skirt structure; 4, second closing structure; 5, metal connection joint; 6, first forming tooling; 7, second forming tooling. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the implementation manners and the accompanying drawings. Herein, the illustrative implementation manners of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention.

[0027] Herein, it also needs to be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0028] It should be emphasized that the term "including / containing" when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0029] Herein, it also needs to be noted that if not otherwise specified, the term "connection" in this article can not only refer to direct connection, but also represent indirect connection with an intermediate.

[0030] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0031] The disadvantages of installing a metal skirt in the prior art are as follows.

[0032] 1. The metal skirt usually needs to be preliminarily processed and then assembled onto the shell completed by spiral winding through an adhesive bonding method. The adhesive bonding method is usually unreliable, difficult to predict the failure mode, has large quality fluctuations, and both axial tension and axial compression conditions rely on the adhesive layer to transfer the load, so the requirements for the adhesive layer are further increased.

[0033] 2. There is usually an electric potential difference between the metal skirt and the composite material. The material with a lower potential usually causes accelerated corrosion due to the migration of electrons. If products with a relatively close potential difference are used, the price is usually high and the performance is difficult to meet.

[0034] 3. The stiffness change between the metal skirt and the composite shell is relatively large, so the transition position usually belongs to the stress concentration position. And the working conditions at this position are relatively complex, usually a combination of multiple working conditions appears. This further increases the difficulty of dealing with this position.

[0035] The disadvantages of installing a composite skirt in the prior art are as follows.

[0036] 1. Regarding the defect of installing a composite skirt, although composite skirts can be made of materials with similar material properties, due to the discontinuous fibers at this position, the load cannot be transferred through the fibers. Therefore, like the metal skirt, there is a situation of stress concentration at this position.

[0037] 2. To make a composite skirt, the skirt part in the intermediate state needs to be formed once through a mold first. This mold is often more expensive than the composite skirt itself.

[0038] 3. Due to its characteristics, the composite skirt is made of unidirectional or bidirectional fibers and does not belong to an isotropic material like a metal material, and is very sensitive to cracks itself. During assembly, if the interference amount with the skirt installation area is relatively large, the skirt extension profit release groove is likely to be torn.

[0039] Referring to Figure 1 , based on the above defects of the prior art, the embodiment of the present invention provides a fiber-wound integrally formed shell with a skirt, including an inner liner 1, an outer shell 2 and a skirt structure 3; wherein, the inner liner 1 is fixedly arranged inside the outer shell 2, the skirt structure 3 is arranged at both ends of the outer shell 2 and the skirt structure 3 is integrally formed with the outer shell 2; the outer shell 2 has a cylindrical middle section structure and first necking structures located on both sides of the middle section structure, and both ends of the outer shell 2 have first openings; the outer wall of the inner liner 1 is attached to the inner wall of the outer shell 2, both ends of the inner liner 1 have second openings, and the first openings and the second openings are coaxially arranged; the skirt structure 3 is an annular thin-wall structure, one end of the skirt structure 3 is connected to the edge of the middle section structure of the outer shell 2, and the circumferential dimension of the skirt structure 3 is less than or equal to the circumferential dimension of the middle section structure.

[0040] In the above embodiments, the inner tank 1 is designed to fit the outer shell 2, which can ensure uniform pressure distribution, reduce local stress concentration, and improve the overall compressive capacity; the skirt structure 3 is integrally formed with the outer shell 2, avoiding the stress concentration problem caused by traditional bonding and improving the structural reliability; the integral forming of the outer shell 2 and the skirt structure 3 is realized through the fiber winding technology, reducing the processing steps and die costs and improving the production efficiency.

[0041] In some embodiments, one end of the skirt structure 3 away from the outer shell 2 has a second closing structure 4 for forming a composite connection interface. The composite connection interface is used to connect the composite structure.

[0042] In some embodiments, the inner end face of the composite connection interface is flush with the end of the outer shell 2.

[0043] In some embodiments, the outer side of the second closing structure 4 has an arc chamfer, which prevents the outer side of the second closing structure 4 from deforming after being impacted.

[0044] Compared with the prior art in which the composite skirt is installed after spiral winding, the fiber winding integrally formed skirted shell in the above embodiments has the following advantages:

[0045] 1. This solution can realize angle winding of any layer of the overall shell, without being restricted to circumferential winding only after installing the skirt, further improving the designability of the composite part;

[0046] 2. This solution does not have the situation of discontinuous fibers in the skirt installation area, is more friendly to the overall stress situation, and the fibers can participate in load transfer;

[0047] 3. There is no need for a special skirt forming tooling, only the skirt positioning tooling on the winding tooling needs to be modified, saving the die;

[0048] 4. This solution is integrally formed, there is no problem of easy tearing during the assembly of the composite skirt, and it will not damage the skirt or the fiber layer;

[0049] 5. In this solution, the skirt and the product are cured simultaneously, and there is no need to separately form the composite skirt additionally, saving the process. And the overall curing degree has good consistency and good processability.

[0050] In some embodiments, referring to Figure 2 The fiber winding integrally formed skirted shell further includes a metal connection joint 5. The metal connection joint 5 is fixedly connected to one end of the skirt structure 3 away from the outer shell 2. The middle of the metal connection joint 5 has a metal connection interface, and the metal connection interface is used to connect the metal structure.

[0051] In some embodiments, the metal connection joint 5 has a rotary structure. The metal connection joint 5 includes an inner ring body and an outer ring body. The inner ring body and the outer ring body are fixedly connected. The circumferential dimension of the inner ring body is smaller than that of the skirt structure 3, and the circumferential dimension of the outer ring body is larger than that of the skirt structure 3. The outer wall of the inner ring body is fixedly connected to the skirt structure 3. Compared with the prior art where the metal skirt is installed after spiral winding, the fiber-wound integrally formed skirted shell in the above embodiments has the following advantages:

[0052] 1. This solution can achieve angle winding on any layer of the overall shell, without being restricted to only circumferential winding after installing the skirt, further improving the designability of the composite material part;

[0053] 2. In this solution, there is no situation where the fibers are discontinuous in the skirt installation area, which is more friendly to the overall stress situation, and the fibers can participate in load transfer;

[0054] 3. Since this solution is formed from the same material, there is no problem of galvanic corrosion and no additional treatment is required;

[0055] 4. This solution is integrally formed, there is no problem of interference fit during the assembly of the metal skirt, and the metal skirt or the fiber layer will not be damaged.

[0056] In some embodiments, referring to Figure 4 , the fiber-wound integrally formed skirted shell further includes a first forming tooling 6. The first forming tooling 6 is detachably connected to the outer shell 2. The first forming tooling 6 has a first arc-shaped surface, and the first arc-shaped surface is adapted to the inner surface of the skirt structure 3. During the winding process, the first forming tooling 6 is installed on both sides of the outer shell. After the skirt structure is wound, the first forming tooling 6 can be removed. The first forming tooling 6 plays a role in yarn hanging and support during the winding process.

[0057] In some embodiments, referring to Figure 3 , the fiber-wound integrally formed skirted shell further includes a second forming tooling 7. The second forming tooling 7 is detachably connected to the outer shell 2. The outer surface of the second forming tooling 7 has a second arc-shaped surface and a necking-shaped surface connected in sequence. The second arc-shaped surface and the necking-shaped surface are adapted to the inner surface of the skirt structure 3. The second forming tooling 7 has the same function as the first forming tooling 6.

[0058] Before the winding skirt structure, it is consistent with the conventional solution. After the shell winding is completed, the detachable tooling is installed on both sides of the shell. Then, the winding program is adjusted so that the winding yarn is hung on the small outside-skirt hanging yarn head. Since the small head is relatively shallow, the problem can be solved by adding a corner at the hanging yarn position. Winding is carried out according to the required number of layers. Therefore, many layers are hung with yarn at the head, so the thickness at this position is necessarily thicker than that at other positions. So this position can be used as a connection interface. The hanging yarn nail solution or the solution of increasing friction can also be used instead of the small outside-skirt hanging yarn head, which will not be elaborated here.

[0059] Because the processability of composite materials is worse than that of metals. If there are complex interfaces, such as threaded, ring gear and other interfaces. The connection interface can be changed to metal. The metal and composite parts can be connected by methods such as adhesive riveting and adhesive screwing after curing. The specific selection can be made according to the actual working conditions, which will not be elaborated here.

[0060] The fiber-wound integrally formed skirted shell in the above embodiments has the following advantages and technical effects: This solution saves die cost, curing cost and labor cost; there is no problem of interfacial stress concentration; there is no problem of interfacial potential corrosion; the problem that angular winding cannot be carried out outside the skirt is solved; compared with the pure metal solution, the weight is reduced; the problem of damage during the installation of the skirt and the composite layer is avoided; the designability is improved, making the design more flexible.

[0061] It should be clear that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, the detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications and additions, or change the order between steps after understanding the spirit of the present invention.

[0062] In the present invention, the features described and / or illustrated for one embodiment can be used in the same way or in a similar way in one or more other embodiments, and / or combined with the features of other embodiments or replace the features of other embodiments.

[0063] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A fiber-wound integrally formed skirt housing, characterized in that: It comprises an inner liner (1), an outer shell (2) and a skirt structure (3); The inner liner (1) is fixedly arranged inside the outer shell (2), the skirt structure (3) is arranged at both ends of the outer shell (2), and the skirt structure (3) and the outer shell (2) are integrally formed; The shell (2) has a cylindrical middle section structure and first closing structures located on both sides of the middle section structure, and both ends of the shell (2) have first openings; The outer wall of the inner container (1) is in contact with the inner wall of the outer shell (2), and the inner container (1) has second openings at both ends, and the first opening and the second opening are coaxially arranged; The skirt structure (3) is an annular thin-walled structure, one end of the skirt structure (3) is connected to the edge of the middle section structure of the shell (2), and the circumferential dimension of the skirt structure (3) is less than or equal to the circumferential dimension of the middle section structure.

2. The fiber-wound integrally formed skirt housing according to claim 1, characterized in that: The end of the skirt structure (3) away from the shell (2) has a second closing structure (4) for forming a composite material connection interface.

3. The fiber-wound integrally formed skirt housing according to claim 2, characterized in that: The inner end surface of the composite material connection interface is flush with the end of the outer shell (2).

4. The fiber-wound integrally formed skirt housing according to claim 2, characterized in that: The outer side of the second closing structure (4) has an arc-shaped chamfer.

5. The fiber-wound integrally formed skirt housing according to claim 1, characterized in that: The fiber-wound integrally formed skirt shell further comprises a metal connection joint (5), wherein the metal connection joint (5) is fixedly connected to an end of the skirt structure (3) away from the outer shell (2), and the middle portion of the metal connection joint (5) has a metal connection interface.

6. The fiber-wound integrally formed skirt housing according to claim 5, characterized in that: The metal connecting joint (5) is a rotary structure, comprising an inner ring body and an outer ring body, wherein the inner ring body and the outer ring body are fixedly connected, the circumferential size of the inner ring body is smaller than the circumferential size of the skirt structure (3), the circumferential size of the outer ring body is larger than the circumferential size of the skirt structure (3), and the outer wall of the inner ring body is fixedly connected to the skirt structure (3).

7. The fiber-wound integrally formed skirt housing according to claim 1, characterized in that: The fiber-wound integrally molded skirt shell further comprises a first molding tool (6), the first molding tool (6) being detachably connected to the outer shell (2), the first molding tool (6) having a first arc-shaped surface, and the first arc-shaped surface being adapted to the inner surface of the skirt structure (3).

8. The fiber-wound integrally formed skirt housing according to claim 2, characterized in that: The fiber-wound integrally molded skirt shell further comprises a second molding tool (7), the second molding tool (7) being detachably connected to the outer shell (2), the outer surface of the second molding tool (7) comprising a second arc-shaped face portion and a closing face portion which are connected in sequence, the second arc-shaped face portion and the closing face portion being adapted to the inner surface of the skirt structure (3).

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