Lap joint structure of outer deformation piece and outer driven piece of spray pipe

Abstract

The invention provides a lap joint structure of an outer deformation piece and an outer driven piece of a spray pipe, and belongs to the technical field of engine exhaust systems, the outer deformation piece and the outer driven piece are each provided with a base body, the molded surface of the base body in the axis direction is of a streamline structure, the middle area of the cross section, perpendicular to the axis direction, of the base body is of an arc structure, and the two sides of the arc structure are straight sections; the included angles corresponding to the arc structures along different axis positions of the base body and the lengths of the straight sections are different; symmetrical lap joint transition molded lines are arranged on the outer driven piece base body and are formed by connecting end points of one ends of arc structures at different axis positions, a non-lap-joint area is formed in the area between the two lap joint transition molded lines, and a lap joint area is formed in the area between each lap joint transition molded line and the edge of the outer driven piece base body. A limiting structure is arranged on a base body of the outer deformation piece, a gap is formed between the limiting structure and the base body, and the outer driven piece is in lap joint in the gap. According to the scheme, the structural stability of the convergent-divergent nozzle is optimized, the weight is reduced, and the comprehensive performance of an engine is improved.

Description

Technical Field

[0001] This application relates to the technical field of engine exhaust systems, and particularly to an overlapping structure between an outer deformation piece and an outer follower piece of a nozzle. Background Art

[0002] An axisymmetric convergent-divergent nozzle mainly consists of multiple outer deformation pieces, outer follower pieces, a retracting and extending motion mechanism, and a flow path component. The outer deformation pieces, outer follower pieces are connected to and wrap the retracting and extending motion mechanism and the flow path component to form a smooth outer aerodynamic profile, thereby reducing the afterbody drag of the aircraft. The convergent-divergent nozzle needs to adjust the throat area according to different engine states. At this time, the convergent and divergent sections perform retracting and extending motions, and the outer deformation pieces and outer follower pieces perform follow-up motions simultaneously. How to ensure that the outer deformation piece and the outer follower piece are closely and reliably overlapped during the retracting and extending process and can form a smooth streamline profile under any working conditions is crucial.

[0003] For the overlapping structure between the outer deformation piece and the outer follower piece of a traditional axisymmetric nozzle, the outer deformation piece is driven by an actuating system to perform retracting and extending motions, and the synchronous motion between the outer deformation piece and the outer follower piece is realized through a synchronous mechanism. This form of connection not only has a complex mechanism, but also has a very small overlapping gap, which is prone to interference. In the case of the main engine vibration, etc., it will also cause the parts to rub against each other, thereby leading to a decrease in structural stiffness and reliability, and there is a risk of the overlapping structure failing. Summary of the Invention

[0004] In view of this, the embodiments of this application provide an overlapping structure between an outer deformation piece and an outer follower piece of a nozzle, which at least partially solves the problems of complex traditional structure and low reliability, effectively inhibits the rubbing between the outer deformation piece and its adjacent parts, and at the same time ensures a good outer aerodynamic profile of the nozzle.

[0005] The embodiments of this application provide an overlapping structure between an outer deformation piece and an outer follower piece of a nozzle. Both the outer deformation piece and the outer follower piece are provided with a base body. The axial profile of the base bodies of the outer deformation piece and the outer follower piece is set as a streamline structure. The middle area of the cross-section perpendicular to the axial direction of the base bodies of the outer deformation piece and the outer follower piece is set as an arc structure. The two sides of the arc structure are straight sections, and the arc structure and the straight sections are smoothly transitioned. The included angles corresponding to the arc structures at different axial positions along the base body are different from each other, and the lengths of the straight sections at different axial positions along the base body are different from each other;

[0006] Two symmetric overlapping transition profiles are provided on the base body of the outer follower piece. Each overlapping transition profile is formed by connecting the end points of the arc structures at different axial positions. The area between the two overlapping transition profiles forms a non-overlapping area, and the area between each overlapping transition profile and the edge of the base body of the outer follower piece forms an overlapping area;

[0007] A limiting structure is provided on the substrate of the outer deformation piece. The limiting structure is arranged perpendicular to the axial direction of the substrate. A gap is provided between the limiting structure and the substrate, and the outer driven piece is lapped in the gap.

[0008] According to a specific implementation manner of an embodiment of the present application, the lapping area includes an initial lapping area and a movable lapping area. The initial lapping area is close to the edge of the outer driven piece, and the movable lapping area is close to the lapping transition line; when the nozzle outlet area is the largest, the outer deformation piece and the outer driven piece are lapped in the initial lapping area. When the nozzle outlet area is the smallest, the edge of the outer deformation piece coincides with the lapping transition line; when the nozzle adjusts the throat area, the outer deformation piece and the outer driven piece are in a follow-up fit in the movable lapping area.

[0009] According to a specific implementation manner of an embodiment of the present application, the design formula for the included angle corresponding to the arc structure is:

[0010]

[0011] Wherein, α is the included angle corresponding to the arc structure; D is the designed width of the outer deformation piece or the outer driven piece; R0 is the starting end radius of the outer deformation piece or the outer driven piece; n is the number of the outer deformation pieces or the outer driven pieces; σ is the width of the initial lapping area; R is the circumferential radius of the arc structure at different positions of the outer deformation piece or the outer driven piece along the axis; β is the included angle between the straight section and the tangent line at the midpoint of the arc structure; L is the width of the movable lapping area.

[0012] According to a specific implementation manner of an embodiment of the present application, the calculation formula for the included angle β between the straight section and the tangent line at the midpoint of the arc structure is:

[0013] β = π / 2n.

[0014] According to a specific implementation manner of an embodiment of the present application, the lapping area is distributed in a fan shape.

[0015] According to a specific implementation manner of an embodiment of the present application, the limiting structure includes a tail end hook. The tail end hook is arranged at the tail of the outer deformation piece. Limiting plates are provided on both sides of the tail of the outer driven piece. The circumferential limit of the lapping between the outer deformation piece and the outer driven piece is realized through the cooperation of the tail end hook and the limiting plates.

[0016] According to a specific implementation manner of an embodiment of the present application, the limiting structure further includes multiple rows of hooks arranged in sequence from the head to the tail of the outer deformation piece.

[0017] According to a specific implementation manner of an embodiment of the present application, reinforcing ribs are provided on the outer deformation piece, and the reinforcing ribs are coupled with the limiting structure.

[0018] According to a specific implementation manner of an embodiment of the present application, the reinforcing ribs include a first reinforcing rib, a second reinforcing rib, and a third reinforcing rib. The first reinforcing rib is located on the axis of the head of the outer deformation piece, the second reinforcing ribs are located on both sides of the first reinforcing rib, and the third reinforcing rib is located on the axis of the tail of the outer deformation piece.

[0019] According to a specific implementation manner of an embodiment of the present application, lugs are provided on both sides of the base of the outer driven piece near the head.

[0020] Beneficial effects:

[0021] In the lap joint structure of the nozzle outer deformation piece and the outer driven piece in the embodiment of the present application, by setting the structures of the outer driven piece and the outer deformation piece, and through the lap joint transition curve, it is divided into a lap joint area and a non-lap joint area. Through the partition design, both the aerodynamic performance of the overall shape of the nozzle and the sealing performance of the lap joint are ensured. The coupled-designed limiting structure ensures that the limiting structure is integrally fitted with the profile of the outer driven piece. When the nozzle performs the retracting and extending movement, the limiting structure of the outer deformation piece can drive the outer driven piece to closely follow, solving the problems of complex structure, uneven force, and too large gap in some profiles in the traditional synchronization scheme.

[0022] The present application realizes the functions of mutual lap joint and retracting and extending movement between the outer deformation piece and the outer driven piece through a simple and reliable method, greatly optimizing the structural stability of the retracting and expanding nozzle and reducing the structural weight, and improving the comprehensive performance of the engine. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used 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, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of the lap joint structure of the nozzle outer deformation piece and the outer driven piece according to an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the cross-sectional profile curve of the outer deformation piece or the outer driven piece according to an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the structure of the outer driven piece according to an embodiment of the present invention;

[0027] Figure 4 Schematic diagram of the structure of the outer deformation piece according to an embodiment of the present invention;

[0028] Figure 5 Schematic diagram of the structure of the mounting ring according to an embodiment of the present invention;

[0029] Figure 6 Schematic diagram of the installation of the outer deformation sheet and the outer driven sheet according to an embodiment of the present invention.

[0030] In the figure: 1 - outer driven sheet; 1a - lug; 2 - nut; 3 - limit plate; 4 - non-lap zone; 5 - movable lap zone; 6 - initial lap zone; 7 - outer deformation sheet; 8 - first row of hooks; 9 - second row of hooks; 10 - third row of hooks; 11 - fourth row of hooks; 12 - tail-end hook; 13 - self-locking nut; 14 - first reinforcing rib; 15 - second reinforcing rib; 16 - third reinforcing rib; 17 - mounting ring. Detailed implementation manners

[0031] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0032] The following uses specific specific examples to illustrate the implementation manners of the present application. 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 in 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 of protection of the present application.

[0033] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should 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 described herein can be used to implement the device and / or practice the method. In addition, this device can be implemented and this method can be practiced using other structures and / or functions in addition to one or more of the aspects described herein.

[0034] It should also be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. The drawings only show the components related to the present application and are not drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in its actual implementation can be an arbitrary change, and the component layout type may also be more complex.

[0035] In addition, in the following description, specific details are provided 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.

[0036] To solve the problems existing in the prior art, the present application designs an efficient connection structure between the outer deformation sheet 7 and the outer driven sheet 1, and realizes the functions of mutual lapping and retracting and extending movements of the two components through a simple and reliable method. This structural device will greatly optimize the structural stability of the expansion and contraction nozzle and reduce the structural weight, improving the comprehensive performance of the engine. The following refers to Figures 1 to 6 to describe in detail the lapping structure of the nozzle outer deformation sheet 7 and the outer driven sheet 1 of the present application.

[0037] In one embodiment, referring to Figure 1 and Figure 2 , for the lapping structure of the nozzle outer deformation sheet 7 and the outer driven sheet 1, both the outer deformation sheet 7 and the outer driven sheet 1 are provided with a matrix. The axial profile of the matrix of the outer deformation sheet 7 and the outer driven sheet 1 is set as a streamline structure. The middle area of the cross-section perpendicular to the axial direction of the matrix of the outer deformation sheet 7 and the outer driven sheet 1 is set as an arc structure, and both sides of the arc structure are straight sections. The arc structure and the straight sections are smoothly transitioned. The included angles corresponding to the arc structures at different axial positions along the matrix are different from each other, and the lengths of the straight sections at different axial positions along the matrix are different from each other;

[0038] Referring to Figure 3 , two symmetric lapping transition profiles are provided on the matrix of the outer driven sheet 1. Each lapping transition profile is formed by connecting the end points of the arc structures at different axial positions. The area between the two lapping transition profiles forms a non-lapping area 4, and the area between each lapping transition profile and the edge of the matrix of the outer driven sheet 1 forms a lapping area;

[0039] A limiting structure is provided on the matrix of the outer deformation sheet 7. The limiting structure is arranged perpendicular to the axial direction of the matrix, and there is a gap between the limiting structure and the matrix. The outer driven sheet 1 lapps in the gap.

[0040] In specific implementation, the matrices of the outer deformation sheet 7 and the outer driven sheet 1 are resin matrix composites. The axial profile of the matrices of the outer deformation sheet 7 and the outer driven sheet 1 is designed as a streamline, and the cross-section perpendicular to the axial direction is designed with an arc structure and smooth transition with the straight sections on both sides. The included angles α corresponding to the arc structures of the cross-sections at different axial positions and the lengths of the straight sections are different from each other to ensure the overall streamline profile of the nozzle and the lapping sealing performance.

[0041] In one embodiment, referring to Figure 3, the overlapping area includes an initial overlapping area 6 and a movable overlapping area 5. The initial overlapping area 6 is close to the edge of the outer driven piece 1, and the movable overlapping area 5 is close to the overlapping transition curve. When the nozzle exit area is the largest, the outer deformation piece 7 and the outer driven piece 1 overlap within the initial overlapping area 6. When the nozzle exit area is the smallest, the edge of the outer deformation piece 7 coincides with the overlapping transition curve. When the nozzle adjusts the throat area, the outer deformation piece 7 and the outer driven piece 1 have a follow-up fit within the movable overlapping area 5.

[0042] Specifically, the outer deformation piece 7 and the outer driven piece 1 are divided into a non-overlapping area 4 and an overlapping area by the overlapping transition curve. When the nozzle exit area is the largest, there is an initial overlapping amount between the outer deformation piece 7 and the outer driven piece 1 within a narrow rectangular range (the initial overlapping area 6), and the overlapping width is the minimum at this time. When the nozzle exit area is the smallest, the overlapping coincidence area is the largest, and the edge line of the outer deformation piece 7 coincides with the overlapping transition curve of the outer driven piece 1. When the nozzle adjusts the throat area, the outer deformation piece 7 and the outer driven piece 1 have a follow-up fit within the movable overlapping area 5.

[0043] In one embodiment, referring to Figure 2 , the design formula for the included angle corresponding to the arc structure is:

[0044]

[0045] Among them, α is the included angle corresponding to the arc structure; D is the designed width of the outer deformation piece 7 or the outer driven piece 1; R0 is the starting-end radius of the outer deformation piece 7 or the outer driven piece 1; n is the number of the outer deformation piece 7 or the outer driven piece 1; σ is the width of the initial overlapping area 6; R is the circumferential radius of the arc structure of the outer deformation piece 7 or the outer driven piece 1 at different positions along the axis; β is the included angle between the straight section and the tangent line at the midpoint of the arc structure; L is the width of the movable overlapping area 5.

[0046] In one embodiment, the calculation formula for the included angle β between the straight section and the tangent line at the midpoint of the arc structure is:

[0047] β = π / 2n.

[0048] In one embodiment, the overlapping area is fan-shapedly distributed.

[0049] During specific implementation, for the outer driven plate 1 and the outer deformation plate 7, they are both connected to the engine mounting ring 17 through screws and nuts 2 arranged at their respective head positions, and on the mounting ring 17, the outer deformation plate 7 and the outer driven plate 1 are alternately arranged. Specifically, the outer driven plate 1 assembly consists of a base body and a head connecting member, and it is connected to the mounting ring 17 through head screws and nuts 2. This connection method completely restricts axial and radial movement while allowing the outer driven plate 1 to have a small circumferential swing space, improving the circumferential lapping flexibility of the outer driven plate 1. A lug 1a is provided on the side of the front middle part of the base body of the outer driven plate 1, extending the circumferential lapping dimension and greatly reducing the risk of lapping failure.

[0050] In one embodiment, referring to Figure 4 , the limiting structure includes a tail end hook 12. The tail end hook 12 is arranged at the tail of the outer deformation plate 7, and limiting plate pieces 3 are provided on both sides of the tail of the outer driven plate 1. The circumferential limit of the lap between the outer deformation plate 7 and the outer driven plate 1 is realized through the cooperation of the tail end hook 12 and the limiting plate pieces 3. By optimizing the mechanism and installation position of the limiting plate pieces 3, the force arm length H is maximally increased, minimizing the force on the structural limit and improving the structural reliability.

[0051] In one embodiment, the limiting structure further includes multiple rows of hooks arranged in sequence from the head to the tail of the outer deformation plate 7. By arranging multiple rows of hooks, the movement of the outer driven plate 1 can be limited, enabling the outer driven plate 1 to move between the multiple rows of hooks and the base body of the outer deformation plate 7.

[0052] In one embodiment, reinforcing ribs are provided on the outer deformation plate 7, and the reinforcing ribs are coupled with the limiting structure. By providing the reinforcing ribs, the overall structural strength of the outer deformation plate 7 is enhanced.

[0053] Furthermore, referring to Figure 4 , the reinforcing ribs include a first reinforcing rib 14, a second reinforcing rib 15, and a third reinforcing rib 16. The first reinforcing rib 14 is located on the axis of the head of the outer deformation plate 7, the second reinforcing rib 15 is located on both sides of the first reinforcing rib 14, and the third reinforcing rib 16 is located on the axis of the tail of the outer deformation plate 7.

[0054] During specific implementation, referring to Figure 5 and Figure 6, the outer deformation piece 7 is composed of a base body, a first row of hooks 8, a second row of hooks 9, a third row of hooks 10, a fourth row of hooks 11, a tail-end hook 12, a first reinforcing rib 14, a second reinforcing rib 15 and a third reinforcing rib 16. The head of the outer deformation piece 7 is fixed on the engine mounting ring 17 through a screw and a self-locking nut 13, and is connected to the moving mechanism through a bracket and driven by it to perform radial retraction and extension movement. The hooks and the reinforcing ribs on the outer deformation piece 7 are coupled and designed. By adapting the profile of the outer driven piece 1 and the layout of the reinforcing ribs, the first to fourth rows of hooks adopt special-shaped curved surfaces, so that the gap between the entire overlapping surface of the hooks and the outer driven piece 1 remains consistent, thereby increasing the contact force-bearing area during the movement process and reducing wear and damage.

[0055] Preferably, the second reinforcing rib 15 is designed as a wedge shape, and the third reinforcing rib 16 is designed as a frustum shape, so that the load of the outer deformation piece 7 is evenly distributed over a larger area, and at the same time, the interference and wear between the lug 1a of the outer driven piece 1 and the second reinforcing rib 15 are avoided, thereby reducing the problem of the stiffness of the overlapping structure.

[0056] In one embodiment, lugs 1a are provided on both sides of the base body of the outer driven piece 1 near the head. By setting the lugs 1a, the circumferential overlapping dimension is extended, and the risk of overlapping failure is greatly reduced.

[0057] In the embodiment provided by the present invention, by setting the structures of the outer driven piece 1 and the outer deformation piece 7, through the overlapping transition curve, it is divided into an overlapping area and a non-overlapping area 4. Through the zoning design, both the aerodynamic performance of the overall shape of the nozzle and the sealing performance of the overlap are ensured; the special-shaped hook profile of the coupled design ensures that the hook profile and the profile of the outer driven piece 1 are integrally fitted. When the nozzle performs retraction and extension movement, the hooks of the outer deformation piece 7 can drive the outer driven piece 1 to closely follow, solving the problems of complex structure, uneven stress and too large gap in some profiles in the traditional synchronization scheme; the wedge-shaped reinforcing rib avoids the interference and wear of the lug 1a of the outer driven piece 1, and solves the problem of the reliability reduction caused by the reduction of the stiffness of the reinforcing rib structure due to rubbing; the lugs 1a on the side of the front middle part of the base body of the outer driven piece 1 extend the circumferential overlapping dimension, reducing the risk of overlapping failure; through the tail-end hook 12 and the limiting plate 3 structure, the circumferential limit of the overlap is realized under the conditions of a large throat and a large outlet area, and the limiting load of the tail-end hook 12 is reduced to the greatest extent, improving the structural reliability.

[0058] This application realizes the functions of mutual overlapping and retraction and extension movement between the outer deformation piece and the outer driven piece through a simple and reliable method, greatly optimizing the structural stability of the convergent-divergent nozzle and reducing the structural weight, and improving the comprehensive performance of the engine.

[0059] As described above, it is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A lapping structure of an outer deformation piece and an outer driven piece of a nozzle, characterized in that Both the outer deformation piece (7) and the outer driven piece (1) are provided with a base body. The axial-profile surfaces of the base bodies of the outer deformation piece (7) and the outer driven piece (1) are both set as streamlined structures. The middle regions of the cross-sections of the base bodies of the outer deformation piece (7) and the outer driven piece (1) perpendicular to the axial direction are set as arc structures. The two sides of the arc structure are straight segments, and the arc structure and the straight segments are smoothly transitioned. The included angles corresponding to the arc structures at different axial positions of the base body are different from each other, and the lengths of the straight segments at different axial positions of the base body are different from each other; Two symmetric lapping transition lines are provided on the base body of the outer driven piece (1). Each lapping transition line is formed by connecting the end points of the arc structures at different axial positions. The region between the two lapping transition lines forms a non-lapping area (4), and the region between each lapping transition line and the edge of the base body of the outer driven piece (1) forms a lapping area; A limiting structure is provided on the base body of the outer deformation piece (7). The limiting structure is arranged perpendicular to the axial direction of the base body. There is a gap between the limiting structure and the base body, and the outer driven piece (1) is lapped in the gap.

2. The lap joint structure of the outer deformation piece and the outer driven piece of the nozzle according to claim 1, wherein The lapping area includes an initial lapping area (6) and a movable lapping area (5). The initial lapping area (6) is close to the edge of the outer driven piece (1), and the movable lapping area (5) is close to the lapping transition line; when the nozzle outlet area is the largest, the outer deformation piece (7) and the outer driven piece (1) are lapped in the initial lapping area (6), and when the nozzle outlet area is the smallest, the edge of the outer deformation piece (7) coincides with the lapping transition line; when the nozzle adjusts the throat area, the outer deformation piece (7) and the outer driven piece (1) are in a follow-up fit in the movable lapping area (5).

3. The overlapping structure of the outer deformation piece and the outer driven piece of the nozzle according to claim 2, wherein, The design formula for the included angle corresponding to the arc structure is: where, α is the included angle corresponding to the arc structure; D is the designed width of the outer deformation piece (7) or the outer driven piece (1); R0 is the starting-end radius of the outer deformation piece (7) or the outer driven piece (1); n is the number of the outer deformation piece (7) or the outer driven piece (1); σ is the width of the initial lapping area (6); R is the circumferential radius of the arc structures at different axial positions of the outer deformation piece (7) or the outer driven piece (1); β is the included angle between the straight segment and the tangent line at the midpoint of the arc structure; L is the width of the movable lapping area (5).

4. The overlapping structure of the outer deformation piece and the outer driven piece of the nozzle according to claim 3, characterized in that, The calculation formula for the included angle β between the straight segment and the tangent line at the midpoint of the arc structure is: β＝π / 2n。 5. The nozzle outer deformation piece and outer driven piece lapping structure according to claim 2, characterized in that, The lapping area is distributed in a fan shape.

6. The overlapping structure of the outer deformation piece and the outer driven piece of the nozzle according to claim 1, characterized in that, The limiting structure includes a tail-end hook (12). The tail-end hook (12) is arranged at the tail of the outer deformation piece (7). Limiting plates (3) are provided on both sides of the tail of the outer driven piece (1). The circumferential limiting of the lapping between the outer deformation piece (7) and the outer driven piece (1) is realized through the cooperation of the tail-end hook (12) and the limiting plates (3).

7. The nozzle outer deformation piece and outer driven piece lapping structure according to claim 6, characterized in that, The limiting structure further includes multiple rows of hooks arranged in sequence from the head to the tail of the outer deformation piece (7).

8. The lapping structure of the outer deformation piece and the outer driven piece of the nozzle according to claim 1, characterized in that, Reinforcing ribs are provided on the outer deformation piece (7), and the reinforcing ribs are coupled with the limiting structure.

9. The lap joint structure of the outer deformation piece and the outer driven piece of the nozzle according to claim 8, characterized in that The reinforcing ribs include a first reinforcing rib (14), a second reinforcing rib (15) and a third reinforcing rib (16). The first reinforcing rib (14) is located on the axis of the head of the outer deformation piece (7), the second reinforcing ribs (15) are located on both sides of the first reinforcing rib, and the third reinforcing rib (16) is located on the axis of the tail of the outer deformation piece (7).

10. The overlapping structure of the outer deformation piece and the outer driven piece of the nozzle according to any one of claims 1-9, characterized in that, Lugs (1a) are provided on both sides of the base body of the outer driven piece (1) near the head.

Images