A grid rudder

Abstract

The present invention discloses a grid rudder, comprising a connected rudder surface structure and a rudder shaft, wherein the rudder surface structure is formed by a grid structure formed by a plurality of grid walls interlaced and connected, and the rudder shaft is used to be connected to an arrow body; the thickness of the grid wall of the rudder surface structure close to one end of the rudder shaft is greater than the thickness of the grid wall far from one end of the rudder shaft. The grid wall of the rudder surface structure adopts a variable thickness structural design, which can reduce the overall weight of the grid rudder under the condition of ensuring that the maximum stress at the rudder shaft of the grid rudder meets the yield stress use requirements.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, and in particular to a grid rudder. Background Art

[0002] Grid rudders are widely used in missiles and launch vehicles. The chord length of the grid rudder is small, the pressure center on the rudder surface is very close to the hinge axis and is less affected by the state quantity, so the hinge torque of the rudder surface is small; when not in use, the grid rudder can be folded and attached to the surface of the rocket (missile), occupying less space and having less impact on the shape of the rocket (missile).

[0003] The grid rudder in the prior art is as follows Figure 1 As shown, the grid wall thickness of the grid rudder is a constant value. According to such a design, the weight of the entire grid rudder is relatively large, which is not conducive to improving the carrying capacity of the rocket body. Therefore, it is necessary to design a grid rudder structure that can meet the requirements of rocket body posture adjustment and is lighter. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem of heavy weight of the grid rudder itself in the prior art, thereby providing a grid rudder.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A grid rudder comprises a connected rudder surface structure and a rudder shaft, wherein the rudder surface structure is formed by a plurality of grid walls interlaced and connected to form a grid structure, and the rudder shaft is used to be connected to an arrow body; the thickness of the grid wall of the rudder surface structure close to one end of the rudder shaft is greater than the thickness of the grid wall far from one end of the rudder shaft.

[0007] Furthermore, the end of the rudder surface structure close to the rudder shaft is a rudder root, and the end away from the rudder shaft is a rudder tip; in the direction from the rudder root to the rudder tip, the thickness of the grid wall decreases step by step.

[0008] Furthermore, the grid wall includes a first grid wall, a second grid wall, a third grid wall, a fourth grid wall and a fifth grid wall, the thickness of which decreases step by step from the rudder root to the rudder tip.

[0009] Furthermore, in the rudder surface structure, the area proportions of the first grid wall, the second grid wall and the third grid wall on the grid structure increase sequentially.

[0010] Further, the thickness of the first cell wall is 17.07 mm, the thickness of the second cell wall is 10 mm, the thickness of the third cell wall is 7 mm, the thickness of the fourth cell wall is 5 mm, and the thickness of the fifth cell wall is 3 mm.

[0011] Furthermore, the first compartment wall and the rudder shaft are integrally formed.

[0012] Furthermore, the rudder surface structure includes a rudder frame located at the periphery and rudder blades that are staggered and connected in the rudder frame to form a grid structure.

[0013] Furthermore, the rudder surface structure is thickened on the cell walls with a large maximum yield stress, and the rudder surface structure is thinned on the cell walls with a small maximum yield stress.

[0014] Furthermore, the windward surface and / or the windward surface of the rudder surface structure are cambered surfaces.

[0015] Furthermore, the arc surface is a circular arc surface matching the shape of the arrow body.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. The lattice rudder provided by the present invention has a lattice wall of the rudder surface structure with a variable thickness structure design, because the stress at one end of the rudder surface structure close to the rudder shaft is greater than the stress at the end away from the rudder shaft. The thickness of the lattice wall close to the rudder shaft is greater than the thickness of the lattice wall away from the rudder shaft. Compared with the design structure of the grid rudder in the prior art using the lattice wall of the same thickness, the overall weight of the grid rudder can be reduced under the condition of ensuring that the maximum stress at the rudder shaft of the grid rudder meets the yield stress use requirements.

[0018] 2. The lattice rudder provided by the present invention has a structural design in which the lattice walls of the rudder surface structure are thickened at locations where the maximum yield stress is large, and are thinned at locations where the maximum yield stress is small. This can further make the grid rudder lighter while ensuring that the maximum stress at various locations of the grid rudder meets the yield stress use requirements.

[0019] 3. The grid rudder provided by the present invention has a cambered surface design on the windward side and / or the dorsal side of the rudder surface structure, which can fit well with the surface of the arrow body and reduce the gap between the grid rudder and the arrow body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a grid rudder in the prior art;

[0022] Figure 2 Schematic diagram of the structure of the grid rudder in the embodiment of the present invention;

[0023] Figure 3Schematic diagram of stress distribution at the root of a grid rudder in an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the grid rudder when it is folded and attached to the surface of the arrow body according to an embodiment of the present invention.

[0025] Explanation of the reference numerals: 1. rudder surface structure; 101. first grid wall; 102. second grid wall; 103. third grid wall; 104. fourth grid wall; 105. fifth grid wall; 2. rudder shaft; 3. arrow body. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The grid rudder in the prior art is as follows Figure 1 As shown, the rudder surface structure of the grid rudder is in a grid shape, and the thickness of all grid walls on the rudder surface structure is 10mm. When not in use, the grid rudder can be folded and attached to the surface of the rocket body, reducing the space occupied by the grid rudder and the impact on the shape of the rocket body.

[0030] like Figure 2As shown, an embodiment of the present invention provides a grid rudder, comprising a connected rudder surface structure 1 and a rudder shaft 2. The rudder surface structure 1 is formed by a grid structure formed by a plurality of grid walls interlaced and connected, and the rudder shaft 2 is used to be hingedly connected to the arrow body 3. The thickness of the grid wall at one end of the rudder surface structure 1 close to the rudder shaft 2 is greater than the thickness of the grid wall at one end away from the rudder shaft 2.

[0031] Since the stress at the end of the rudder surface structure 1 close to the rudder shaft 2 is greater than the stress at the end away from the rudder shaft 2, the lattice wall of the rudder surface structure 1 is designed with a variable thickness structure so that the thickness of the lattice wall close to the rudder shaft 2 is greater than the thickness of the lattice wall away from the rudder shaft 2. Compared with the design structure of the grid rudder in the prior art that uses the lattice wall with the same constant value, the overall weight of the grid rudder can be reduced while ensuring that the maximum stress at the rudder shaft 2 of the grid rudder meets the yield stress use requirements.

[0032] Specifically, the end of the rudder surface structure 1 close to the rudder shaft 2 is the rudder root, and the end away from the rudder shaft 2 is the rudder tip; in the direction from the rudder root to the rudder tip, the thickness of the grid wall tends to decrease step by step. In a specific implementation of this embodiment, the rudder surface structure 1 is divided into five areas according to the thickness of the grid wall, namely, area I, area II, area III, area IV, and area V, and the thickness of the grid wall in each area is the same. In other implementations, the rudder surface structure 1 can also be divided into two areas, three areas, four areas or six or more areas according to the thickness of the grid wall. The more areas on the rudder surface structure 1 are divided, the more conducive to the lightweight design of the grid rudder structure, but it will also increase the difficulty of designing and manufacturing the rudder surface structure 1. Therefore, in this embodiment, the preferred method is to divide the rudder surface structure 1 into five connected areas according to the thickness of the grid wall.

[0033] In this embodiment, the grid wall includes a first grid wall 101, a second grid wall 102, a third grid wall 103, a fourth grid wall 104 and a fifth grid wall 105, the thickness of which decreases step by step from the rudder root to the rudder tip. Specifically, the thickness of the first grid wall 101 is 17.07 mm, the thickness of the second grid wall 102 is 10 mm, the thickness of the third grid wall 103 is 7 mm, the thickness of the fourth grid wall 104 is 5 mm, and the thickness of the fifth grid wall 105 is 3 mm. The way of gradually reducing the thickness of the grid wall can make the structure of the grid rudder lighter while meeting the stress requirements.

[0034] In the rudder surface structure 1, since the maximum stress value that meets the yield stress use requirement at the rudder root position close to the rudder shaft 2 of the grid rudder is relatively large, and the maximum stress value that meets the yield stress use requirement at the rudder root position close to the rudder shaft 2 is relatively small, and the maximum stress value that needs to meet the yield stress use requirement at each position of the grid rudder from the rudder root to the rudder tip is gradually reduced; therefore, the thickness of the first grid wall 101 at the connection between the rudder surface structure 1 and the rudder shaft 2 is set to 17.07mm, which is greater than the grid wall constant value of the prior art (specifically 10mm), and the thickness of the fifth grid wall 105 farthest from the rudder root is set to 3mm, which is less than the grid wall constant value of the prior art, and the thicknesses of the other second grid walls 102, third grid walls 103, and fourth grid walls 104 are set to 10mm, 7mm and 5mm respectively. The rudder root of the grid rudder with this design structure can well meet the yield stress use requirement, and can reduce the overall weight of the grid rudder compared with the grid rudder with a grid wall constant value of 10mm.

[0035] Specifically, the first cell wall 101 and the rudder shaft 2 are an integrally formed structure; the area proportions of the first cell wall 101, the second cell wall 102 and the third cell wall 103 on the grid structure increase in sequence. In a specific implementation of this embodiment, taking the number of edges of the grid structure as an example, the first cell wall 101 has four edges, the second cell wall 102 has 10 edges, the third cell wall 103 has 18 edges, the fourth cell wall 104 has 26 edges, and the fifth cell wall 105 has 32 edges.

[0036] On the other hand, the rudder surface structure 1 is composed of a rudder frame located at the periphery and rudder blades that are staggered and connected in the rudder frame to form a grid structure. The rudder blades and the rudder blades and the rudder frame are all integrally formed structures.

[0037] In a preferred implementation of this embodiment, the rudder surface structure 1 is thickened on the cell wall with a large maximum yield stress, and the rudder surface structure 1 is thinned on the cell wall with a small maximum yield stress. Under certain conditions (such as Mach number 2.0, angle of attack 10 degrees, altitude 0km), the stress of each part of the grid rudder is analyzed to obtain the stress distribution diagram of the grid rudder as a whole. Taking the stress distribution diagram at the root of the grid rudder as an example, Figure 3 As shown, Figure 4 The maximum stress values ​​that need to meet the yield stress use requirements in each of the middle regions a, b, c, d, e, f, g, h, and i increase in sequence; therefore, according to the stress distribution diagram of the rudder surface structure 1, the cell walls with large maximum yield stress can be thickened, and the cell walls with small maximum yield stress can be thinned, so as to reduce the overall mass of the grid rudder as much as possible while meeting the stress requirements.

[0038] like Figure 4As shown, in this embodiment, the windward surface and / or the leeward surface of the rudder surface structure 1 are cambered surfaces. Specifically, when the outer shape of the arrow body 3 is cylindrical, the cambered surface is an arc surface that matches the outer shape of the arrow body 3. The radius of the cambered surface is determined by the radius of the arrow body 3. Compared with the design structure in the prior art in which both the windward surface and the leeward surface are flat, the grid rudder in which the windward surface and / or the leeward surface are designed as cambered surfaces can better fit the surface of the arrow body 3, thereby reducing the gap between the rudder surface structure 1 and the arrow body 3 when the grid rudder is retracted.

[0039] In summary, the grid rudder provided in the embodiment of the present invention, on the one hand, the lattice wall of the rudder surface structure 1 adopts a variable thickness structural design, which can reduce the overall weight of the grid rudder while ensuring that the maximum stress at the rudder shaft 2 of the grid rudder meets the yield stress use requirements; on the other hand, the windward surface and / or the dorsal surface of the rudder surface structure 1 are designed as curved surfaces, which can better fit the surface of the arrow body 3, thereby reducing the gap between the rudder surface structure 1 and the arrow body 3 when the grid rudder is folded.

[0040] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A grid rudder, comprising a connected rudder surface structure (1) and a rudder shaft (2), wherein the rudder surface structure (1) is formed by a plurality of grid walls interlaced and connected to form a grid structure, and the rudder shaft (2) is used to be connected to an arrow body (3); It is characterized in that The thickness of the cell wall of the rudder surface structure (1) at one end close to the rudder shaft (2) is greater than the thickness of the cell wall at one end away from the rudder shaft (2); The cell walls include a first cell wall (101), a second cell wall (102), a third cell wall (103), a fourth cell wall (104) and a fifth cell wall (105) whose thickness decreases step by step from the rudder root to the rudder tip; In the rudder surface structure (1), the first cell wall (101), the second cell wall (102), and the third cell wall (103) occupy an increasing proportion of the area on the grid structure; Wherein, in the grid structure, the first cell wall (101) has 4 edges, the second cell wall (102) has 10 edges, the third cell wall (103) has 18 edges, the fourth cell wall (104) has 26 edges, and the fifth cell wall (105) has 32 edges.

2. The grid rudder according to claim 1, It is characterized in that The end of the rudder surface structure (1) close to the rudder shaft (2) is the rudder root, and the end away from the rudder shaft (2) is the rudder tip; in the direction from the rudder root to the rudder tip, the thickness of the cell wall decreases step by step.

3. The grid rudder according to claim 1, It is characterized in that The thickness of the first cell wall (101) is 17.07 mm, the thickness of the second cell wall (102) is 10 mm, the thickness of the third cell wall (103) is 7 mm, the thickness of the fourth cell wall (104) is 5 mm, and the thickness of the fifth cell wall (105) is 3 mm.

4. The grid rudder according to claim 1, It is characterized in that The first compartment wall (101) and the rudder shaft (2) are integrally formed.

5. The grid rudder according to claim 1, It is characterized in that The rudder surface structure (1) comprises a rudder frame located at the periphery and rudder blades which are staggered and connected in the rudder frame to form a grid structure.

6. The grid rudder according to claim 1, It is characterized in that The rudder surface structure (1) is thickened on the cell walls with a large maximum yield stress, and the rudder surface structure (1) is thinned on the cell walls with a small maximum yield stress.

7. The grid rudder according to claim 1, It is characterized in that The windward surface and / or the windward surface of the rudder surface structure (1) are cambered surfaces.

8. The grid rudder according to claim 7, It is characterized in that The arc surface is a circular arc surface matching the outer shape of the arrow body (3).

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