Rain erosion head

Abstract

The rain erosion head comprises a protection part and a limiting part, and the protection part and the limiting part are connected through a connecting part; and at least one hollow window is formed between the protection part and the limiting part. By adopting the rain erosion head provided by the embodiment of the utility model, the stability is improved based on an interlocking structure, meanwhile, the structure does not change the overall RCS performance, and the stealth performance of an aircraft is not reduced.

Description

Technical Field

[0001] This application relates to aircraft technology, and more specifically, to a rain erosion head. Background Technology

[0002] When an aircraft flies at high speed, its surface is eroded by raindrops, causing damage to the radome composite structure. Therefore, a rain-etching head design is implemented on the radome surface. However, traditional solutions have poor adhesion, making it difficult to bond the rain-etching head to the radome surface. Furthermore, in existing technologies, the rain-etching head is bonded to the radome tip composite surface using PTFE adhesive during assembly. However, due to the weak polarity of PTFE, the adhesion is poor. Additionally, the rain-etching head is bonded to the radome in a secondary adhesive process, making bonding between two rigid curved surfaces difficult, resulting in relatively low reliability for this rain-etching head design. Utility Model Content

[0003] This application addresses the shortcomings of existing rain-etching heads, such as poor adhesion and low reliability, by providing a rain-etching head to overcome these deficiencies.

[0004] The present invention provides the following solution to the above problems: a rain erosion head is provided, including a protective part and a limiting part, the protective part and the limiting part being connected by a connecting part; at least one hollow window is formed between the protective part and the limiting part.

[0005] Preferably, the protective part has a conical structure, and the interior of the protective part has a cavity for accommodating the component to be protected.

[0006] Preferably, the limiting part is a ring-shaped component.

[0007] Preferably, the protective part, the connecting part, and the limiting part are integrally formed.

[0008] Preferably, the outer surface of the limiting part and the outer surface of the connecting part form a stepped transition structure.

[0009] Preferably, there are two perforated windows, which are positioned opposite each other.

[0010] Preferably, a first adhesive film is provided between the inner side of the rain erosion head and the component to be protected, and a second adhesive film is filled through the perforated window, with the first and second adhesive films covering the limiting part.

[0011] The rain erosion head of this invention improves stability based on an interlocking structure, while the structure does not change the overall RCS performance and does not reduce the stealth performance of the aircraft. Attached Figure Description

[0012] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a perspective view of a rain erosion head according to an embodiment of the present invention;

[0015] Figure 2 This is an internal view of a rain erosion head according to an embodiment of the present invention;

[0016] Figure 3 A schematic diagram of an assembled rain erosion head according to an embodiment of this utility model;

[0017] Figure 4 The diagram shows the HH polarization characteristics of this invention at a frequency of 9.41 GHz and different angles.

[0018] Figure 5 The present invention presents VV polarization characteristics at different angles at a frequency of 9.41 GHz.

[0019] Figure 6 The diagram shows the HH polarization characteristics of this invention at a frequency of 15.2 GHz at different angles.

[0020] Figure 7 The present invention presents VV polarization characteristics at different angles at a frequency of 15.2 GHz.

[0021] Figure 8 A flowchart illustrating the assembly process using this invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] like Figure 1 The image shown is a perspective view of a rain-etching head according to an embodiment of the present invention. The rain-etching head includes a protective portion 100 for fitting onto the tip of a radome or other aircraft component requiring protection; a limiting portion 300 for forming a physical interlocking structure with the cured adhesive film to limit the displacement of the rain-etching head in the detachment direction; the protective portion 100 and the limiting portion 300 are connected by a connecting portion 200; at least one perforated window 400 is formed between the protective portion 100 and the limiting portion 300 for adding adhesive film through the perforated window 400 after fitting onto the tip of the radome.

[0025] Furthermore, such as Figure 2 The internal view shown depicts a conical protective section 100 with an internal cavity for fitting over the tip of the radome to be protected. In other words, the protective section has an umbrella-like structure. Those skilled in the art will understand that the conical shape of the protective section is not the only feasible solution; this shape is only suitable for the shape of the aircraft component to be protected. Similarly, the shape of the internal cavity of the umbrella-like structure is not uniquely limited; it only needs to fit the tip of the component to be protected.

[0026] Combination Figure 1 and Figure 2 The limiting portion 300 of the rain-etching head is a circular ring-shaped component, even though its inner surface can fit against the tip of the radome. It is understood that for irregularly shaped structures, such as certain special shapes based on aerodynamic requirements, the limiting portion 300 of the rain-etching head can be manufactured to adapt to the surface shape of the aircraft component to be protected. The outer surface of the limiting portion 300 and the outer surface of the connecting portion 200 are at different heights; that is, the outer surface of the limiting portion 300 and the outer surface of the connecting portion 200 do not use a smooth transition, but rather form a stepped transition structure 201, so that the interlocking structure after the adhesive film has cured can enclose the limiting portion 300. The outer surface after the adhesive film has cured forms a complete transition surface with the outer surfaces of the connecting portion 200 and the protective portion 100.

[0027] like Figure 3 The diagram shown is a schematic of the assembled rain head. Figure 3 The etched head is assembled on the tip of the radome. After the bonding surfaces of the etched head and the radome are activated, a layer of carrier-free J-159 adhesive film is first applied to the bonding area of ​​the radome tip as an adhesive layer. After the etched head is fitted, a carrier-bearing J-159 adhesive film is used to fill the perforated window area. The surface carrier adhesive film 500 is then applied to the outer surface of the radome at the rear of the etched head and formed by vacuum bag thermoforming. The carrier-free adhesive film ensures good adhesion to the radome body. The carrier-bearing adhesive film filling the perforated window 400 and the surface carrier-bearing adhesive film 500 extend to the radome surface to form a physical interlocking structure, wrapping and fixing the rear half of the etched head, greatly improving reliability.

[0028] Preferably, the protective part, the connecting part, and the limiting part are integrally formed.

[0029] Preferably, at least two perforated windows are provided, and the perforated windows are positioned opposite each other.

[0030] When using the rain erosion head of this utility model for tiling, the process is as follows: Figure 8 As shown, the radome to be processed is first positioned. After the bonding surfaces of the etched head and the radome are activated, a layer of carrier-free J-159 adhesive film is first applied to the bonding area of ​​the radome tip as an adhesive layer. After the etched head is fitted, a carrier-bearing J-159 adhesive film is used to fill the perforated window area. The surface carrier film is then applied to the outer surface of the radome at the rear of the etched head and formed by vacuum bag thermoforming. The carrier-free adhesive film ensures good adhesion to the radome body. The carrier-bearing adhesive film filling the perforated area and the surface carrier-bearing adhesive film extend to the radome surface to form a physical interlocking structure, wrapping and fixing the rear half of the etched head. Compared with the original technology, in the original technology, the etched head is bonded to the surface of the radome tip composite material using Thomas adhesive. The advantage of this design is its simple process and good maintainability. However, due to the weak polarity of polytetrafluoroethylene (PTFE) material, the adhesion performance is poor. Furthermore, the etched head is bonded to the radome in a secondary process, making the bonding of two rigid curved surfaces difficult, resulting in relatively low reliability of this etched head solution.

[0031] In the above embodiments of this utility model, J159 adhesive film is used for bonding. J-159 adhesive film is a medium-temperature curing epoxy film suitable for bonding aluminum alloys, composite materials, etc., to plates or cores. It has a curing temperature of 120–130℃ and can be used in environments ranging from -55 to 150℃. J-159 adhesive film is the same type used for lightning protection strips on the surface of the enclosure and can meet the requirement of long-term resistance to a stagnation temperature of 120℃.

[0032] It is understandable that other similar adhesive films can also be used as substitutes, as long as they meet the installation parameters and can be operated through the perforated window in the rain erosion head of this utility model.

[0033] like Figures 4-7 To compare the RCS of the erosion head using this invention and the erosion head using the original technology, wherein... Figure 4 Electromagnetic characteristics at a frequency of 9.41 GHz with different HH polarization angles (i.e., both transmission and reception are horizontally polarized); Figure 5 Electromagnetic characteristics at a frequency of 9.41 GHz with different VV polarization angles (i.e., both transmission and reception are vertically polarized); Figure 6 Electromagnetic characteristics of HH polarization at different angles with a frequency of 15.2 GHz; Figure 6 Electromagnetic characteristics at different VV polarization angles with a frequency of 15.2 GHz.

[0034] A comparison of the electromagnetic characteristics described above shows that, based on the RCS simulation results of the rain-etched head scheme in this application and existing technologies, the scattering produced by the rain-etched head scheme in this application is essentially equivalent to that of the existing rain-etched heads, and the magnitudes are relatively low, indicating that neither is a major scattering source. The rain-etched head scheme in this application has no impact on stealth performance.

[0035] The rain erosion head of the above embodiments of this utility model improves stability based on the interlocking structure, while the structure does not change the overall RCS performance and does not reduce the stealth performance of the aircraft.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rain erosion head, characterized in that, It includes a protective part (100) and a limiting part (300), the protective part (100) and the limiting part (300) being connected by a connecting part (200); at least one open window (400) is formed between the protective part (100) and the limiting part (300).

2. The rain erosion head according to claim 1, characterized in that, The protective part (100) has a conical structure, and the interior of the protective part (100) is provided with a cavity for accommodating the part (100) to be protected.

3. The rain erosion head according to claim 1, characterized in that, The limiting part (300) is a ring-shaped component.

4. The rain erosion head according to claim 1, characterized in that, The protective part (100), the connecting part (200), and the limiting part (300) are integrally formed.

5. The rain erosion head according to claim 1, characterized in that, The outer surface of the limiting part (300) and the outer surface of the connecting part (200) form a stepped transition structure (201).

6. The rain erosion head according to claim 1, characterized in that, There are two perforated windows (400), and the perforated windows (400) are positioned opposite each other.

7. The rain erosion head according to claim 1, characterized in that, A first adhesive film is provided between the inner side of the rain erosion head and the part to be protected (100), and a second adhesive film is filled through the hollow window (400). The first adhesive film and the second adhesive film wrap around the limiting part (300).

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