Rhombic centering structure of axisymmetric adjustable spray pipe adjusting sheet

Abstract

The invention relates to the technical field of aero-engines, in particular to a rhombic centering structure of an axisymmetric adjustable spray pipe adjusting sheet, which comprises a driving adjusting sheet and a driven adjusting sheet, each driven adjusting sheet covers a gap between two adjacent driving adjusting sheets, and further comprises two long connecting rods and four short connecting rods; the two long connecting rods are arranged in a crossed mode, and the crossed portions of the two long connecting rods are jointly installed on the driven adjusting piece through a first hinge structure. The two ends of each long connecting rod are each provided with a short connecting rod through a second hinge structure, and the ends, away from the long connecting rods, of the two short connecting rods close to the active adjusting piece are jointly installed on the active adjusting piece through a third hinge structure. The two long connecting rods and the four short connecting rods jointly form a double-rhombus connecting rod structure. By means of the structure, the driven adjusting piece can be prevented from inclining, and then the problem that the driven adjusting piece is eccentrically abraded after an engine works for a long time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of aeroengines, and particularly to a diamond centering structure of an adjustable nozzle vane for an axisymmetric adjustable nozzle. Background Art

[0002] The adjustable nozzle of an aeroengine is one of the main structures of the engine exhaust system. The tail nozzle realizes an adjustable design with different outlet diameters through a control mechanism, so as to meet the thrust adjustment requirements of the engine within a certain range. The axisymmetric adjustable nozzle of an aeroengine can adjust the size and shape of the nozzle, so that the engine maintains a high working efficiency at different flight stages and adapts to a wider range of flight conditions.

[0003] In the prior art, for example, in US6192671B1, a slider is used to cooperate with a chute on a central rod to ensure the coordinated movement of the active vane and the driven vane. Another patent application with the publication number CN113530705A discloses a retraction and extension limiting device for an outer vane of an adjustable nozzle of an aeroengine, in which the limiting component can ensure that the outer lower vane does not escape from the existing limiting gap between the outer upper vanes during the expansion movement of the adjustable nozzle from the minimum diameter state to the maximum diameter state.

[0004] At present, the connection mode between the active vane and the driven vane of the axisymmetric adjustable nozzle commonly used in domestic and foreign engines mostly adopts a connecting rod lapping form, and the active vane is driven by a hydraulic actuator. Due to manufacturing differences, the hydraulic actuator may have an out-of-sync phenomenon, and the force applied by the active vane to the driven vane is uneven, resulting in the driven vane tilting to one side. During long-term operation of the engine, the driven vane will have eccentric wear, and in severe cases, the driven vane will be stuck and fail. The structures in the above prior art US6192671B1 and CN113530705A also cannot solve the problem of eccentric wear of the driven vane. Summary of the Invention

[0005] The main object of the present invention is to propose a diamond centering structure of an adjustable nozzle vane for an axisymmetric adjustable nozzle, aiming to solve the above technical problems.

[0006] To achieve the above object, the present invention proposes a diamond centering structure of an adjustable nozzle vane for an axisymmetric adjustable nozzle, including an active vane and a driven vane; the driven vane covers the interval between two adjacent active vanes, and further includes two long connecting rods and four short connecting rods; the two long connecting rods are cross-arranged, and the cross part of the two long connecting rods is commonly installed on the driven vane through a first hinge structure; at each end of each long connecting rod, a short connecting rod is installed through a second hinge structure, and the ends of the two short connecting rods close to the active vane away from the long connecting rods are commonly installed on the active vane through a third hinge structure; the two long connecting rods and the four short connecting rods together form a double diamond connecting rod structure.

[0007] Preferably, both the long connecting rod and the short connecting rod are plate bodies, and their thicknesses δ and widths W are equal respectively; mounting holes are provided in the middle and at both ends of the long connecting rod; the distances from the mounting holes at both ends of the long connecting rod to the middle mounting hole are equal; mounting holes are also provided at both ends of the short connecting rod; the hole pitch of the mounting holes at both ends of the long connecting rod is L1, and the hole pitch of the mounting holes at both ends of the short connecting rod is L2; it satisfies: L2 = 0.5×L1.

[0008] Preferably, the hole pitch of the mounting holes at both ends of the long connecting rod is L1, and it satisfies: 1.6S ≤ L ≤ 2.2S; 1.8H ≤ L ≤ 2.5H; where: H is the width of the tail of the active adjusting piece; S is the stroke of the radial movement of the tail of the active adjusting piece.

[0009] Preferably, the first hinge structure includes a first mounting post integrally formed on the driven adjusting piece, and a first sphere is sleeved on the first mounting post; the inner surface of the mounting hole in the middle of the long connecting rod is spherical, and the two long connecting rods are respectively sleeved on the upper half and the lower half of the first sphere through the mounting holes in the middle; a first gasket and a first nut are screwed on the upper part of the first mounting post.

[0010] Preferably, a first longitudinal reinforcing rib is integrally formed on the surface of the driven adjusting piece, and the first longitudinal reinforcing rib is located at the left - right symmetry center of the driven adjusting piece; the first mounting post is integrally formed on the first longitudinal reinforcing rib; multiple first transverse reinforcing ribs are integrally formed on the surface of the first longitudinal reinforcing rib and the driven adjusting piece.

[0011] Preferably, a first ear plate is integrally formed at the head end of the first longitudinal reinforcing rib, and the first ear plate is used for hinging with the support ring of the engine cylinder body.

[0012] Preferably, the second hinge structure includes a screw and a second sphere; the second sphere is sleeved on the screw; the inner surfaces of the mounting holes at the ends of the long connecting rod and the mounting holes at the ends of the short connecting rod are both spherical, and the mounting hole at the end of the long connecting rod and the mounting hole at one end of the short connecting rod are respectively sleeved on the upper half and the lower half of the second sphere; a second gasket and a second nut are screwed on the upper part of the screw.

[0013] Preferably, the third hinge structure includes a second mounting post and a third sphere; a boss is integrally formed on the surface of the active adjustment piece; the second mounting post is integrally formed on the top surface of the boss; the third sphere is sleeved on the second mounting post; the inner surfaces of the mounting holes at the ends of the short connecting rods are all spherical surfaces, and the mounting holes at the ends of the two short connecting rods away from the long connecting rod are respectively sleeved on the upper half and the lower half of the third sphere; a third gasket and a third nut are sleeved on the upper part of the second mounting post.

[0014] Preferably, the included angle between the long connecting rod and the short connecting rod is β. When the active adjustment piece and the driven adjustment piece are deployed to the limit state, β ≤ 120°.

[0015] Preferably, two parallel second longitudinal reinforcing ribs are integrally formed on the surface of the active adjustment piece, and a plurality of second transverse reinforcing ribs are integrally formed between the two second longitudinal reinforcing ribs; a second ear plate is integrally formed at the leading end of the second longitudinal reinforcing rib, and the second ear plate is used for hinging with the support ring of the engine cylinder; two third ear plates are integrally formed on the surface of the active adjustment piece, and the third ear plates are used for connecting with the hydraulic actuator in the engine.

[0016] Due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0017] (1) In the present invention, by using two long connecting rods and four short connecting rods to jointly form a double-rhombus connecting rod structure, during the expansion and contraction process of the two active adjustment pieces, the driven adjustment piece can always be in the middle position between the two active adjustment pieces, ensuring that the acting forces formed by the two active adjustment pieces on the driven adjustment piece are balanced, avoiding the inclination of the driven adjustment piece, and further avoiding the problem of eccentric wear of the driven adjustment piece under the long-term operation of the engine.

[0018] (2) In the present invention, by using two long connecting rods and four short connecting rods to jointly form a double-rhombus connecting rod structure, the layout is compact, and the space required for the movement of the components is small, which can ensure the centering of the driven adjustment piece during the expansion and contraction process of the axisymmetric adjustable nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 It is a schematic diagram of the rhombus centering structure provided by the present invention;

[0021] Figure 2 Schematic diagram of the diamond centering structure provided by the present invention along the longitudinal direction of flight;

[0022] Figure 3 Schematic diagram of the first hinge structure in the present invention;

[0023] Figure 4 Schematic diagram of the second hinge structure in the present invention;

[0024] Figure 5 Schematic diagram of the third hinge structure in the present invention;

[0025] Figure 6 Schematic diagram of the long connecting rod in the present invention;

[0026] Figure 7 is Figure 6 A - A cross-sectional view in;

[0027] Figure 8 Schematic diagram of the short connecting rod in the present invention;

[0028] Figure 9 is Figure 8 B - B cross-sectional view in.

[0029] Explanation of reference numerals: 1, active adjusting piece; 1a, second mounting post; 1b, boss; 1c, second longitudinal reinforcing rib; 1d, second transverse reinforcing rib; 1e, second ear plate;, third ear plate; 2, driven adjusting piece; 2a, first mounting post; 2b, first longitudinal reinforcing rib; 2c, first transverse reinforcing rib; 2d, first ear plate; 3, long connecting rod; 4, short connecting rod; 5, first sphere; 6, first gasket; 7, first nut; 8, screw; 9, second sphere; 10, second gasket; 11, second nut; 12, third sphere; 13, third gasket; 14, third nut. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, in the present invention, the front end towards the longitudinal direction of flight is the "head end", and the rear end towards the longitudinal direction of flight is the "tail end".

[0032] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] As shown in the accompanying drawings, a diamond centering structure of an axisymmetric adjustable nozzle flap includes an active flap 1 and a driven flap 2; the driven flap 2 covers the gap between two adjacent active flaps 1, and also includes two long connecting rods 3 and four short connecting rods 4; the two long connecting rods 3 are cross - arranged, and the cross - part of the two long connecting rods 3 is commonly installed on the driven flap 2 through a first hinge structure; at both ends of each long connecting rod 3, a short connecting rod 4 is installed through a second hinge structure, and the ends of the two short connecting rods 4 close to the active flap 1 away from the long connecting rod 3 are commonly installed on the active flap 1 through a third hinge structure; the two long connecting rods 3 and the four short connecting rods 4 together form a double - diamond connecting rod structure.

[0034] By adopting the above structure, during the expansion and contraction process of the two active flaps 1, the driven flap 2 can always be in the middle position between the two active flaps 1, ensuring that the acting forces formed by the two active flaps 1 on the driven flap 2 are balanced, avoiding the inclination of the driven flap 2, and further avoiding the problem of eccentric wear of the driven flap 2 during the long - term operation of the engine.

[0035] Combined Figures 6 to 9 As shown, both the long connecting rod 3 and the short connecting rod 4 are plate - shaped, and their thicknesses δ and widths W are respectively equal; installation holes are provided in the middle and at both ends of the long connecting rod 3; the distances from the installation holes at both ends of the long connecting rod 3 to the middle installation hole are equal; installation holes are also provided at both ends of the short connecting rod 4; the hole pitch of the installation holes at both ends of the long connecting rod 3 is L1, and the hole pitch of the installation holes at both ends of the short connecting rod 4 is L2; satisfying: L2 = 0.5×L1.

[0036] Furthermore, the hole pitch of the installation holes at both ends of the long connecting rod 3 is L1, satisfying:

[0037] 1.6S≤L≤2.2S;

[0038] 1.8H≤L≤2.5H;

[0039] Wherein: H is the width of the tail of the active adjusting piece; S is the stroke of the radial movement of the tail of the active adjusting piece.

[0040] Combined with Figure 3 As shown, the first hinge structure includes a first mounting post 2a integrally formed on the driven adjusting piece 2, and a first sphere 5 is sleeved on the first mounting post 2a; the inner surface of the mounting hole in the middle of the long connecting rod 3 is spherical, and the two long connecting rods 3 are respectively sleeved on the upper half and the lower half of the first sphere 5 through the mounting holes in the middle; a first gasket 6 and a first nut 7 are screwed on the upper part of the first mounting post 2a. By using the first gasket 6 to form a blocking and limiting effect on the long connecting rod 3, the long connecting rod 3 is prevented from falling off. In this embodiment, the first gasket 6 is arranged with a gap from the long connecting rod 3, which can ensure the radial movement amount of the upper long connecting rod 3. At the same time, the two long connecting rods 3 are matched with the upper half and the lower half of the first sphere 5 through the spherical mounting holes in the middle, which is beneficial to ensure that the two long connecting rods 3 are arranged at intervals and avoid interference during movement.

[0041] Combined with Figure 1 As shown, a first longitudinal reinforcing rib 2b is integrally formed on the surface of the driven adjusting piece 2, and the first longitudinal reinforcing rib 2b is located at the left-right symmetry center of the driven adjusting piece 2; the first mounting post 2a is integrally formed on the first longitudinal reinforcing rib 2b; a plurality of first transverse reinforcing ribs 2c are integrally formed on the surface of the first longitudinal reinforcing rib 2b and the driven adjusting piece 2. By arranging the first longitudinal reinforcing rib 2b and the first transverse reinforcing ribs 2c, the driven adjusting piece 2 can be strengthened and the rigidity of the driven adjusting piece 2 can be increased. Further, a first ear plate 2d is integrally formed at the head end of the first longitudinal reinforcing rib 2b, and the first ear plate 2d is used for hinging with the support ring of the engine cylinder body.

[0042] Combined with Figure 4 As shown, the second hinge structure includes a screw 8 and a second sphere 9; the second sphere 9 is sleeved on the screw 8; the inner surfaces of the mounting holes at the ends of the long connecting rod 3 and the short connecting rod 4 are both spherical, and the mounting hole at the end of the long connecting rod 3 and the mounting hole at one end of the short connecting rod 4 are respectively sleeved on the upper half and the lower half of the second sphere 9; a second gasket 10 and a second nut 11 are screwed on the upper part of the screw 8. By using the second gasket 10 to form a blocking and limiting effect, the long connecting rod 3 is prevented from falling off. The long connecting rod 3 and the short connecting rod 4 are matched with the upper half and the lower half of the second sphere 9 through the spherical mounting holes at the ends, which is beneficial to ensure that the long connecting rod 3 and the short connecting rod 4 are arranged at intervals and avoid interference during movement.

[0043] Combined with Figure 5As shown, the third hinge structure includes a second mounting post 1a and a third sphere 12; a boss 1b is integrally formed on the surface of the active adjusting piece 1; the second mounting post 1a is integrally formed on the top surface of the boss 1b; the third sphere 12 is sleeved on the second mounting post 1a; the inner surfaces of the mounting holes at the ends of the short connecting rods 4 are all spherical surfaces, and the mounting holes at one end of the two short connecting rods 4 away from the long connecting rod 2 are respectively sleeved on the upper half and the lower half of the third sphere 12; a third gasket 13 and a third nut 14 are sleeved on the upper part of the second mounting post 1a. By using the third gasket 13 to form a blocking and limiting effect, the short connecting rods 4 are prevented from falling off. The two short connecting rods 4 are matched with the upper half and the lower half of the third sphere 12 through the spherical mounting holes at the ends, which is beneficial to ensure that the two short connecting rods 4 are arranged at intervals and avoid interference during movement.

[0044] Combined with Figure 1 As shown, the included angle between the long connecting rod 3 and the short connecting rod 4 is β. When the active adjusting piece 1 and the driven adjusting piece 2 are unfolded to the limit state, β ≤ 120°. By limiting the angle of β, the long connecting rod 3 and the short connecting rod 4 are prevented from being stuck when retracting.

[0045] Combined with Figure 1 As shown, two parallel second longitudinal reinforcing ribs 1c are integrally formed on the surface of the active adjusting piece 1, and a plurality of second transverse reinforcing ribs 1d are integrally formed between the two second longitudinal reinforcing ribs 1c; by using the second longitudinal reinforcing ribs 1c and the second transverse reinforcing ribs 1d to strengthen the active adjusting piece 1, the rigidity of the active adjusting piece 1 is increased. Further, a second ear plate 1e is integrally formed at the leading end of the second longitudinal reinforcing rib 1c, and the second ear plate 1e is used for hinging with the support ring of the engine cylinder body; two third ear plates 1f are integrally formed on the surface of the active adjusting piece 1, and the third ear plates 1f are used for connecting with the hydraulic actuator in the engine. The engine cylinder body and the hydraulic actuator are all existing components on the engine and will not be elaborated here.

[0046] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A diamond-shaped centering structure of an axisymmetric adjustable nozzle adjusting plate, comprising an active adjusting plate (1) and a passive adjusting plate (2); the passive adjusting plate (2) covers the gap between two adjacent active adjusting plates (1), characterized in that: It also includes two long connecting rods (3) and four short connecting rods (4); The two long connecting rods (3) are arranged crosswise, and the intersection of the two long connecting rods (3) is mounted on the driven adjustment plate (2) via a first hinge structure; A short connecting rod (4) is respectively installed at both ends of each long connecting rod (3) via a second hinge structure, and the ends of the two short connecting rods (4) close to the active adjustment plate (1) and away from the long connecting rod (3) are installed on the active adjustment plate (1) via a third hinge structure; The two long connecting rods (3) and the four short connecting rods (4) together form a double diamond connecting rod structure.

2. A diamond-shaped centering structure of an axisymmetric adjustable nozzle adjusting plate according to claim 1, characterized in that: The long connecting rod (3) and the short connecting rod (4) are both plates, and the thickness δ and width W of the two are respectively equal; mounting holes are respectively arranged in the middle part and at both ends of the long connecting rod (3); the distances from the mounting holes at both ends of the long connecting rod (3) to the middle mounting hole are equal; Mounting holes are also provided at both ends of the short connecting rod (4); The hole spacing of the mounting holes at both ends of the long connecting rod (3) is L1, and the hole spacing of the mounting holes at both ends of the short connecting rod (4) is L2; Satisfies: L2=0.5×L1.

3. The diamond-shaped centering structure of the axisymmetric adjustable nozzle adjusting plate according to claim 2, characterized in that: The hole spacing of the mounting holes at both ends of the long connecting rod (3) is L1, which satisfies: 1.6S≤L≤2.2S; 1.8H≤L≤2.5H; Wherein: H is the width of the active adjustment tail portion; S is the stroke of the active adjustment tail portion's radial movement.

4. The diamond-shaped centering structure of the axisymmetric adjustable nozzle adjusting plate according to claim 2, characterized in that: The first hinge structure comprises a first mounting column (2a) integrally formed on the driven adjustment plate (2), and a first sphere (5) is sleeved on the first mounting column (2a); The inner surface of the middle mounting hole of the long connecting rod (3) is a spherical surface, and the two long connecting rods (3) are respectively sleeved on the upper and lower halves of the first sphere (5) through the middle mounting hole; a first gasket (6) is sleeved on the upper part of the first mounting column (2a), and a first nut (7) is screwed on.

5. The diamond-shaped centering structure of the axisymmetric adjustable nozzle adjusting plate according to claim 4, characterized in that: A first longitudinal reinforcing rib (2b) is integrally formed on the surface of the driven regulating piece (2), and the first longitudinal reinforcing rib (2b) is located at the left-right symmetrical center of the driven regulating piece (2); the first mounting column (2a) is integrally formed on the first longitudinal reinforcing rib (2b); and a plurality of first transverse reinforcing ribs (2c) are integrally formed on the first longitudinal reinforcing rib (2b) and the surface of the driven regulating piece (2).

6. The diamond-shaped centering structure of the axisymmetric adjustable nozzle adjusting plate according to claim 5, characterized in that: A first ear plate (2d) is integrally formed at the head end of the first longitudinal reinforcing rib (2b), and the first ear plate (2d) is used for being hinged to the supporting ring of the engine barrel.

7. The diamond-shaped centering structure of the axisymmetric adjustable nozzle adjusting plate according to claim 2, characterized in that: The second hinge structure comprises a screw (8) and a second sphere (9); The second sphere (9) is sleeved on the screw (8); the inner surfaces of the mounting hole at the end of the long connecting rod (3) and the mounting hole at the end of the short connecting rod (4) are both spherical surfaces, and the mounting hole at the end of the long connecting rod (3) and the mounting hole at one end of the short connecting rod (4) are sleeved on the upper half and lower half of the second sphere (9) respectively; A second gasket (10) is sleeved on the upper part of the screw (8), and a second nut (11) is screwed on.

8. The diamond-shaped centering structure of an axisymmetric adjustable nozzle adjusting plate according to claim 2, characterized in that: The third hinge structure comprises a second mounting column (1a) and a third sphere (12); A boss (1b) is integrally formed on the surface of the active adjustment plate (1); the second mounting column (1a) is integrally formed on the top surface of the boss (1b); The third sphere (12) is sleeved on the second mounting column (1a); the inner surfaces of the mounting holes at the ends of the short connecting rods (4) are all spherical surfaces, and the mounting holes at the ends of the two short connecting rods (4) away from the long connecting rod (2) are sleeved on the upper half and the lower half of the third sphere (12) respectively; A third gasket (13) is sleeved on the upper part of the second mounting column (1a), and a third nut (14) is screwed on.

9. The diamond-shaped centering structure of an axisymmetric adjustable nozzle adjusting plate according to claim 1, characterized in that: The included angle between the long connecting rod (3) and the short connecting rod (4) is β, and when the active regulating piece (1) and the driven regulating piece (2) are unfolded to the limit state, β≯120°.

10. The diamond-shaped centering structure of an axisymmetric adjustable nozzle adjusting plate according to claim 1, characterized in that: Two parallel second longitudinal reinforcing ribs (1c) are integrally formed on the surface of the active adjustment plate (1), and a plurality of second transverse reinforcing ribs (1d) are integrally formed between the two second longitudinal reinforcing ribs (1c); A second ear plate (1e) is integrally formed at the head end of the second longitudinal reinforcing rib (1c), and the second ear plate (1e) is used for being hinged to the support ring of the engine barrel; Two third ear plates (1f) are integrally formed on the surface of the active adjustment plate (1), and the third ear plates (1f) are used to connect with the hydraulic actuator in the engine.

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