Spraying pipe outer elastic piece double-margin locking connection structure

Abstract

The invention belongs to the technical field of aero-engine exhaust nozzle design, and provides a nozzle outer elastic piece double-margin locking connection structure which comprises a tray self-locking nut, a flat square special-shaped lining, a screw and a locking structure, a through hole is formed in an outer elastic piece, the flat square special-shaped lining is installed in the through hole from the outer side of the outer elastic piece, and the locking structure is arranged on the outer side of the flat square special-shaped lining. The screw penetrates through the flat square special-shaped lining from the outer side of the outer elastic piece and then is connected with the tray self-locking nut located on the inner side of the outer elastic piece, and the flat square special-shaped lining and the screw are connected through the locking structure to lock the screw. According to the double-margin locking connection structure for the outer elastic piece of the spray pipe, the connection reliability of the outer elastic piece after being disassembled and assembled for multiple times can be improved, the situation that the outer elastic piece is disengaged due to the fact that locking force is reduced is avoided, the rectification effect of the outer elastic piece in the flying process is ensured, and maintainability and structural reliability are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engine nozzle design and relates to a double-margin locking connection structure for an elastic sheet outside the nozzle. Background Art

[0002] The elastic sheet outside the aero-engine nozzle is used to cover the components inside the nozzle cavity, realize integration with the rear body surface of the aircraft, and the streamlined outer surface plays a fairing effect to reduce the aerodynamic drag of the aircraft. During use and outfield maintenance, a simple and reliable elastic sheet connection technology is particularly important, so it brings new challenges to the reliability design of the connection of the elastic sheet outside the nozzle.

[0003] At present, the connection of the elastic sheet outside the nozzle generally uses screws and self-locking nuts to realize the connection between the elastic sheet and the engine. However, due to the limited disassembly and assembly space, the self-locking nuts are usually riveted on the elastic sheet outside, and the reliability of this single locking method is relatively low. Moreover, the vibration of the engine, the retraction and extension movement of the nozzle, and the deflection movement of the elastic sheet outside will all generate additional forces on the connection structure, which will also cause the self-locking torque to decrease, and the locking structure will wear, affecting the connection reliability.

[0004] In addition, during maintenance, the locking structure is disassembled and assembled many times, which causes the locking force of the self-locking nut to gradually decrease, and then leads to the failure of the connection of the elastic sheet outside. In severe cases, the elastic sheet outside will come off and damage the aerodynamic shape of the aircraft. When the aerodynamic shape of the aircraft is damaged, the resistance will increase and the reliability of the components inside the cavity will decrease after being exposed.

[0005] Therefore, it is urgent to optimize the structure of the traditional connection of the elastic sheet outside to improve the connection reliability after multiple disassembly and assembly of the elastic sheet outside. Summary of the Invention

[0006] In order to solve the technical problem that the connection reliability of the traditional elastic sheet outside connection structure decreases after multiple disassembly and assembly, resulting in the decrease of the locking force and the ejection of the elastic sheet outside, so as to achieve the purpose of ensuring the fairing effect of the elastic sheet outside during flight, improving the maintainability and structural reliability, the present invention discloses a double-margin locking connection structure for an elastic sheet outside the nozzle, including a tray self-locking nut, a flat-square special-shaped bushing, a screw and a locking structure. A through hole is formed in the elastic sheet outside. The flat-square special-shaped bushing is installed into the through hole from the outside of the elastic sheet outside. The screw passes through the flat-square special-shaped bushing from the outside of the elastic sheet outside and is connected to the tray self-locking nut located inside the elastic sheet outside. The locking structure connects the flat-square special-shaped bushing and the screw to lock the screw.

[0007] Furthermore, the tray self-locking nut is fixed inside the elastic sheet outside by a plurality of rivets.

[0008] Further, the flat square-shaped special-shaped bushing includes a flat square-shaped special-shaped sleeve. A section of the through hole close to the outside of the outer elastic sheet is a square hole section, and a section close to the inside of the outer elastic sheet is a round hole section. The outer peripheral wall of the flat square-shaped special-shaped sleeve fits with the inner wall of the square hole section.

[0009] Furthermore, the flat square-shaped special-shaped bushing includes a locking sleeve connected to the flat square-shaped special-shaped sleeve. The lower end surface of the locking sleeve contacts the outer elastic sheet. The locking structure includes a split pin and through holes respectively located on the locking sleeve and the screw. The split pin passes through the through holes on the locking sleeve and the screw to limit and lock the screw.

[0010] Preferably, there are 1 to 3 groups of the through holes, and milling edges are processed at the positions where the through holes are provided on the outer periphery of the locking sleeve.

[0011] Further, it further includes a support sheet. The support sheet is arranged outside the outer elastic sheet, and a square hole through which the flat square-shaped special-shaped bushing passes is provided on the support sheet.

[0012] The double-margin locking connection structure of the outer elastic sheet of the nozzle designed by the present invention can be applied to the outer elastic sheet of the exhaust system of a gas turbine engine, and the following technical effects can be achieved:

[0013] a) In the case where the space structure is limited and the locking operation cannot be performed from the inside, the tray self-locking nut can be connected to the outer elastic sheet through the riveting technology, and the screw cooperates with the tray self-locking nut to achieve the first locking in the "blind installation" structure; the "flat square-shaped special-shaped bushing + split pin" structure is used to realize the secondary anti-rotation of the screw, so that the connection structure has a double-margin locking function;

[0014] b) By arranging the split pin outside, it is convenient for inspection and avoids the problem that the torque of the internal self-locking nut is reduced and cannot be visually detected;

[0015] c) The bushing cannot rotate through the cooperation of the flat square-shaped special-shaped bushing and the square hole above the support sheet or the square hole above the outer elastic sheet;

[0016] d) The split pin simultaneously passes through the through holes on the flat square-shaped special-shaped bushing and the screw to connect the flat square-shaped special-shaped bushing and the screw together, so that the screw cannot rotate during use, and the screw is locked;

[0017] e) The double-locking design of the split pin and the tray self-locking nut is adopted, which improves the reliability of the connection, and the structure is simple and convenient for disassembly and assembly.

[0018] In summary, the double - margin locking connection structure of the elastic sheet outside the nozzle designed by the present invention can improve the connection reliability of the elastic sheet outside after multiple disassembly and assembly, avoid the detachment of the elastic sheet outside caused by the decrease of the locking force, ensure the rectifying effect of the elastic sheet outside during the flight process, and improve the maintainability and structural reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the double - margin locking connection structure of the elastic sheet outside the nozzle disclosed in the embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the self - locking nut of the inner tray of the elastic sheet outside disclosed in the embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the flat - square special - shaped bushing disclosed in the embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the screw disclosed in the embodiment of the present invention;

[0024] Figure 5 It is a partial schematic diagram of the support sheet disclosed in the embodiment of the present invention;

[0025] Figure 6 It is a cross - sectional schematic diagram of the through - hole disclosed in the embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the square - hole section disclosed in the embodiment of the present invention;

[0027] Figure 8 It is a schematic diagram of the round - hole section disclosed in the embodiment of the present invention;

[0028] Among them, 1. Rivet; 2. Self - locking nut of the tray; 3. Elastic sheet outside; 31. Through - hole; 331. Square - hole section; 332. Round - hole section; 4. Flat - square special - shaped bushing; 41. Flat - square special - shaped sleeve; 42. Locking sleeve; 5. Support sheet; 51. Square - shaped hole; 6. Screw; 7. Opposite - perforation; 8. Split pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The embodiments of the present application will be described in detail below with reference to the drawings.

[0030] The following describes the implementation manners of the present application through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features of the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope protected by the present application.

[0031] In the description of this embodiment, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0032] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0033] It should also be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present disclosure in a schematic manner. The components shown in the drawings only show the components related to the present disclosure, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation may be arbitrarily changed, and the component layout type may also be more complex.

[0034] An embodiment of the present invention discloses an elastic sheet double - margin locking connection structure outside a nozzle. Refer to Figure 1As shown, the double - margin locking connection structure of the elastic sheet outside the nozzle includes a tray self - locking nut 2, a flat - square special - shaped bushing 4, a screw 6 and a locking structure. A through - hole 31 is provided on the outer elastic sheet 3. The flat - square special - shaped bushing 4 is installed into the through - hole 31 from the outside of the outer elastic sheet 3. The screw 6 passes through the flat - square special - shaped bushing 4 from the outside of the outer elastic sheet 3 and is connected to the tray self - locking nut 2 located inside the outer elastic sheet 3. The locking structure connects the flat - square special - shaped bushing 4 and the screw 6 to lock the screw 6.

[0035] Through the settings of the flat - square special - shaped bushing 4, the screw 6 and the locking structure, the present invention can lock the screw 6, avoiding the screw 6 from loosening and detaching from the tray self - locking nut 2 due to vibration during the flight of the aero - engine or the operation of the elastic sheet, and ensuring that the elastic sheet will not come out. In addition, the setting of the flat - square special - shaped bushing 4 can also prevent its self - rotation, avoiding driving the screw 6 to rotate and causing the screw 6 to detach from the tray self - locking nut 2.

[0036] Further, as shown in Figure 2 The tray self - locking nut 2 is fixed to the inside of the outer elastic sheet 3 by a plurality of rivets 1.

[0037] Further, as shown in Figure 3 The flat - square special - shaped bushing 4 includes a flat - square special - shaped sleeve 41. As shown in Figure 6 and Figure 8 A section of the through - hole 31 close to the outside of the outer elastic sheet 3 is a square - hole section 331, and a section close to the inside of the outer elastic sheet 3 is a round - hole section 332. The outer peripheral wall of the flat - square special - shaped sleeve 41 fits with the inner wall of the square - hole section 331. The flat - square special - shaped sleeve 41 arranged in the square - hole on the outside of the outer elastic sheet 3 can prevent its self - rotation in the through - hole 31.

[0038] Even further, as shown in Figure 1 and Figure 3 and Figure 4 The flat - square special - shaped bushing 4 includes a locking sleeve 42 connected to the flat - square special - shaped sleeve 41. When there is no setting on the outside of the outer elastic sheet 3, the lower end face of the locking sleeve 42 directly contacts the outer elastic sheet 3. The locking structure includes an opening pin 8 and through - holes 7 respectively located on the locking sleeve 42 and the screw 6. The opening pin 8 passes through the through - holes 7 on the locking sleeve 42 and the screw 6 to limit and lock the screw 6.

[0039] Preferably, there are 1 - 3 groups of the through - holes 7. At the same time, in order to achieve a weight - reduction design, a milling edge can be processed on the outer periphery of the locking sleeve 42 at the position where the through - holes 7 are provided.

[0040] Further, as shown in Figure 1 and Figure 5As shown, in order to improve the connection strength, the double-margin locking connection structure of the elastic sheet outside the nozzle further includes a support sheet 5. The support sheet 5 is arranged outside the outer elastic sheet 3, and a square hole 51 through which the flat-square special-shaped bushing 4 passes is formed on the support sheet 5. When the support sheet 5 is arranged outside the outer elastic sheet 3, the lower end surface of the locking sleeve 42 is in contact with the support sheet 5 at this time.

[0041] For the double-margin locking connection structure of the elastic sheet outside the nozzle of the present invention, the design of the flat-square special-shaped bushing 4 can limit its rotation, avoid its driving the screw 6 to rotate self and separate from the tray self-locking nut 2. At the same time, through the locking structure (the through hole 7 and the split pin 8), the flat-square special-shaped bushing 4 and the screw 6 can be locked and prevented from rotating, which improves the connection reliability again. And when the locking force of the tray self-locking nut 2 is reduced and it is not convenient to replace after multiple disassembly and assembly, the split pin 8 still has a good locking effect.

[0042] The double-margin locking connection structure of the elastic sheet outside the nozzle designed by the present invention can be applied to the outer elastic sheet of the exhaust system of a gas turbine engine, and can achieve the following technical effects:

[0043] a) In the case where the space structure is limited and the locking operation cannot be carried out from the inside, the tray self-locking nut can be connected to the outer elastic sheet through the riveting technology, and the screw and the tray self-locking nut cooperate to realize the first locking under the "blind installation" structure; by using the "flat-square special-shaped bushing + split pin" structure, the secondary anti-rotation of the screw is realized, and the connection structure has the double-margin locking function;

[0044] b) By arranging the split pin outside, it is convenient for inspection and avoids the problem that the torque of the internal self-locking nut is reduced and cannot be directly detected;

[0045] c) The bushing cannot rotate through the cooperation of the flat-square special-shaped bushing and the square hole on the support sheet or the upper hole on the outer elastic sheet;

[0046] d) The split pin simultaneously passes through the through holes on the flat-square special-shaped bushing and the screw, connecting the flat-square special-shaped bushing and the screw together, so that the screw cannot rotate during use and plays a locking role on the screw;

[0047] e) Adopting the double-locking design of the split pin and the tray self-locking nut improves the connection reliability, and the structure is simple and convenient for disassembly and assembly.

[0048] In short, the double-margin locking connection structure of the elastic sheet outside the nozzle designed by the present invention can improve the connection reliability of the outer elastic sheet after multiple disassembly and assembly, and also avoid the outer elastic sheet from coming off due to the decrease of the locking force, ensuring the rectifying effect of the outer elastic sheet during flight, improving the maintainability and structural reliability.

[0049] Obviously, those skilled in the art should understand that 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.

[0050] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double-margin locking connection structure for an elastic sheet outside a nozzle, characterized in that It includes a tray self-locking nut (2), a flat square special-shaped bushing (4), a screw (6) and a locking structure. A through hole (31) is formed in the outer elastic sheet (3). The flat square special-shaped bushing (4) is installed into the through hole (31) from the outside of the outer elastic sheet (3). The screw (6) passes through the flat square special-shaped bushing (4) from the outside of the outer elastic sheet (3) and then is connected to the tray self-locking nut (2) located inside the outer elastic sheet (3). The locking structure connects the flat square special-shaped bushing (4) and the screw (6) to lock the screw (6).

2. The double-margin locking connection structure of the elastic sheet outside the nozzle according to claim 1, wherein The tray self-locking nut (2) is fixed to the inside of the outer elastic sheet (3) by a plurality of rivets (1).

3. The double-margin locking connection structure of the elastic sheet outside the nozzle according to claim 1, wherein The flat square special-shaped bushing (4) includes a flat square special-shaped sleeve (41). A section of the through hole (31) close to the outside of the outer elastic sheet (3) is a square hole section (331), and a section close to the inside of the outer elastic sheet (3) is a round hole section (332). The outer peripheral wall of the flat square special-shaped sleeve (41) fits with the inner wall of the square hole section (331).

4. The double-margin locking connection structure of the elastic sheet outside the nozzle according to claim 3, characterized in that, The flat square special-shaped bushing (4) includes a locking sleeve (42) connected to the flat square special-shaped sleeve (41). The lower end face of the locking sleeve (42) contacts the outer elastic sheet (3). The locking structure includes a split pin (8) and through holes (7) respectively located on the locking sleeve (42) and the screw (6). The split pin (8) passes through the through holes (7) on the locking sleeve (42) and the screw (6) to limit and lock the screw (6).

5. The double-margin locking connection structure of the elastic sheet outside the nozzle according to claim 4, characterized in that There are 1 to 3 groups of the through holes (7). A milling edge is machined at the position where the through holes (7) are provided on the outer periphery of the locking sleeve (42).

6. The double-margin locking connection structure of the elastic sheet outside the nozzle according to claim 1, characterized in that It further includes a support sheet (5). The support sheet (5) is arranged on the outside of the outer elastic sheet (3). A square hole (51) through which the flat square special-shaped bushing (4) passes is formed in the support sheet (5).

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