Exhaust pipe structure of a marine engine

Abstract

This application belongs to the field of semiconductor devices and relates to an exhaust pipe structure for a marine engine, including: a pipe body and a filter screen; the pipe body has a cylindrical structure, the filter screen is disposed inside the pipe body and covers the cross-section of one end of the pipe body; the filter screen has an extended skirt to cover the inner wall of one end of the pipe body; the filter screen is made of metal; it also includes: a resistance wire; the resistance wire is disposed inside the pipe body; there is a gap between the resistance wire and the inner wall of the pipe body; there are multiple resistance wires, and the multiple resistance wires are arranged in a cylindrical structure; the resistance wires are arranged in an array; the material of the resistance wire is 0Cr25AL5; it also includes: a window frame; the window frame has a ring structure, the inner ring of the window frame is connected to the outside of one end of the pipe body, and the window frame is perpendicular to the pipe body; it also includes: a venetian blind; the venetian blind is connected to the inside of one end of the pipe body. Using this application can reduce radar wave reflection from the venetian blinds of the exhaust pipe structure and is low in cost.

Description

Technical Field

[0001] The present application relates to the technical field of semiconductor devices, and in particular to an exhaust pipe structure of a marine engine. Background Art

[0002] The exhaust pipe of a marine engine has a large diameter and a long length. After the electromagnetic waves enter, they are refracted multiple times and then returned to the outside, which can easily form a strong RCS target and affect the stealth performance of the entire ship.

[0003] The traditional treatment method is to lay absorbing materials on the exhaust pipe wall to absorb the incoming electromagnetic waves. However, the temperature of the exhaust pipe is generally above 500 degrees, and traditional radar absorbing materials and metamaterials are difficult to work properly.

[0004] Coating the inside of the air intake duct with high-temperature resistant absorbing materials can effectively absorb radar waves entering the duct, thereby reducing RCS. However, high-temperature absorbing materials, especially those with broadband absorbing performance, are extremely expensive and difficult to install, maintain, and replace, making them unsuitable for large-scale use. Summary of the Invention

[0005] Based on this, it is necessary to provide an exhaust pipe structure for a marine engine to address the above technical problems, which can reduce the radar wave reflection of the louvers of the exhaust pipe structure and has low cost.

[0006] An exhaust pipe structure for a marine engine, comprising: a pipe body and a filter screen;

[0007] The tube body is in a cylindrical structure, and the filter screen is arranged inside the tube body and covers the cross section of one end of the tube body.

[0008] In one embodiment, the filter screen has an extended skirt to cover the inner wall of one end of the tube body.

[0009] In one embodiment, the filter is made of metal.

[0010] In one embodiment, it further includes: a resistance wire; the resistance wire is arranged inside the tube body.

[0011] In one embodiment, there is a gap between the resistance wire and the inner wall of the tube body.

[0012] In one embodiment, there are multiple resistance wires, and the multiple resistance wires are in a cylindrical structure.

[0013] In one embodiment, the resistance wires are distributed in an array.

[0014] In one embodiment, the resistance wire is made of 0Cr25AL5.

[0015] In one embodiment, further comprising: a window frame;

[0016] The window frame is a ring-shaped structure, the inner ring of the window frame is connected to the outside of one end of the tube body, and the window frame is perpendicular to the tube body.

[0017] In one embodiment, further comprising: a venetian blind;

[0018] The venetian blind is connected to the interior of one end of the tube body.

[0019] The exhaust pipe structure of the above-mentioned marine engine is provided with a filter within the cylindrical tube body, and the filter covers the cross-section of one end of the tube body, which can form an electromagnetic wave scattering layer, so that the electromagnetic waves entering the exhaust pipe structure are reflected multiple times on the inner wall of the tube body, and the energy is consumed, thereby reducing the radar wave reflection of the exhaust pipe structure louver, overcoming the long-term high temperature environment, effectively suppressing the radar scattering cross-section (RCS), and achieving "stealth"; at the same time, it can achieve a 10dB absorption effect within the 12GHz±1GHz frequency band, reducing the RCS of the structure; in addition, the filter can achieve the above functions using conventional materials, which can effectively save costs and reduce the difficulty of use and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of an exhaust pipe structure of a marine engine in one embodiment;

[0021] Figure 2 is an internal diagram of an exhaust pipe structure of a marine engine according to one embodiment;

[0022] Figure 3 The figure is a cross-sectional view of an exhaust pipe structure of a marine engine in one embodiment.

[0023] Reference numerals:

[0024] Pipe body 1, filter screen 2, resistance wire 3, window frame 4, venetian blinds 5, exhaust pipe structure 6. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application without creative work are within the scope of protection of this application.

[0026] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, and so on, unless otherwise specifically defined.

[0028] In this application, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood in a broad sense. For example, "fix" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two elements or an interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0030] The present application provides an exhaust pipe structure for a marine engine, such as Figures 1 to 3 As shown, in one embodiment, it includes: a tube body 1 and a filter screen 2; the tube body 1 is a cylindrical structure, and the filter screen 2 is arranged inside the tube body 1 and covers the cross section of one end of the tube body 1.

[0031] In this embodiment, a filter screen 2 is provided at one end of the tube body 1 and the other end is connected to the hull; the interior of the tube body 1 is hollow, forming a space as the exhaust pipe structure 6.

[0032] The exhaust pipe structure of the above-mentioned marine engine is provided with a filter within the cylindrical tube body, and the filter covers the cross-section of one end of the tube body, which can form an electromagnetic wave scattering layer, so that the electromagnetic waves entering the exhaust pipe structure are reflected multiple times on the inner wall of the tube body, and the energy is consumed multiple times, thereby reducing the radar wave reflection of the exhaust pipe structure louvers, reducing the waves reflected outside the exhaust pipe structure, overcoming the long-term high temperature environment, effectively suppressing the radar scattering cross-section (RCS), and achieving "stealth"; at the same time, it can achieve a 10dB wave absorption effect within the 12GHz±1GHz frequency band, reducing the RCS of the structure; in addition, the filter can achieve the above functions using conventional materials, which can effectively save costs and reduce the difficulty of use and maintenance.

[0033] In one embodiment, the filter 2 has an extended skirt to cover the inner wall of one end of the tube body 1, that is, the filter is foldable and can provide more irregular reflecting surfaces, which is beneficial to the energy consumption of radar waves, thereby further suppressing the radar scattering cross-section.

[0034] In one embodiment, the filter 2 is made of metal to achieve a better reflection effect, close to total reflection, and avoid transmission as much as possible.

[0035] In one embodiment, it also includes: a resistance wire 3; the resistance wire 3 is arranged inside the tube body 1, so that the electromagnetic waves are scattered and reflected, and the energy is consumed by the resistance wire, and the resistance wire cooperates with the filter 2 to form an absorber, effectively realizing the absorption of electromagnetic waves in a wide frequency band, and further realizing "stealth", and the price of the resistance wire 3 and the filter 1 is extremely cheap, easy to purchase, and easy to lay, install and replace.

[0036] In this embodiment, the fixing method of the resistance wire 3 and the tube body 1 belongs to the existing technology and will not be described here in detail.

[0037] In one embodiment, there is a gap between the resistance wire 3 and the inner wall of the tube body 1, so that the resistance wire 3 is suspended a certain distance above the inner wall of the tube body 1, providing space for the reflection of electromagnetic waves, and ensuring the rapid installation of the resistance wire 3, making it convenient to install and replace it inside the tube body 1.

[0038] Specifically, the distance between the resistance wire 3 and the tube body 1 is set according to the wavelength, and the distance is equivalent to the reflection distance, and the relationship between the reflection distance and the wavelength is established accordingly. The longer the distance, the proportional relationship between the gap generated and the longer the wavelength is established. The longer the wavelength, the smaller the absorption frequency band, and the lower the frequency. The corresponding absorber has better absorption effect in the low frequency band, thereby further achieving the effect of broadband absorption by adjusting the distance between the resistance wire and the tube body.

[0039] In one embodiment, there are multiple resistance wires 3 , and the multiple resistance wires 3 are in a cylindrical structure.

[0040] In this embodiment, the resistance wire 3 has a cylindrical structure and is arranged at intervals inside the tube body 1 to form a closed resistance surface covering the inner wall of the tube body 1, consuming as much energy of the electromagnetic wave as possible, further ensuring the scattering and reflection efficiency of the electromagnetic wave, and achieving a better "stealth" effect.

[0041] In one embodiment, the resistance wires 3 are distributed in an array.

[0042] In one embodiment, the material of the resistance wire 3 is 0Cr25AL5, the resistivity is 1.42Ωmm2 / m, the wire diameter is 2.8mm, the thermal conductivity coefficient is 46.1, the power is 3kW, and the winding diameter of the resistance wire is 16mm, so as to ensure the absorption efficiency while being easy to purchase and install, reducing costs, and being suitable for large-scale promotion.

[0043] In one embodiment, it further includes: a window frame 4 and a venetian blind 5; the window frame 4 is an annular structure, the inner ring of the window frame 4 is connected to the outside of one end of the tube body 1, and the window frame 4 is perpendicular to the tube body 1; the venetian blind 5 is connected to the inside of one end of the tube body 1.

[0044] In this embodiment, the filter 2 is provided at one end of the tube body 1 of the exhaust pipe structure, and the window frame 4 and the venetian blind 5 are both provided at the other end of the tube body 1 of the exhaust pipe structure.

[0045] The periphery of the window frame 5 is provided with mounting holes for mounting and fixing the window frame 4 to the hull.

[0046] The connection methods between the window frame 5 and the tube body 1, the blinds 5 and the tube body 1, and the window frame 4 and the hull are all existing technologies and will not be repeated here.

[0047] The present application does not limit the shape, size and material of the tube body 1, which can be specifically configured according to actual conditions and will not be elaborated here.

[0048] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An exhaust pipe structure for a marine engine, characterized in that: include: Tube body and filter; The tube body is in a cylindrical structure, and the filter screen is arranged inside the tube body and covers the cross section of one end of the tube body; It also includes: a resistance wire; the resistance wire is arranged inside the tube body, so that the electromagnetic wave is scattered and reflected, and the energy is consumed by the resistance wire, and the resistance wire cooperates with the filter screen to form an absorber to achieve electromagnetic wave absorption in a wide frequency band; There is a gap between the resistance wire and the inner wall of the tube, so that the resistance wire is suspended above the inner wall of the tube, providing space for the reflection of electromagnetic waves; The number of the resistance wires is multiple, and the multiple resistance wires are in a cylindrical structure; the resistance wires are distributed in an array.

2. The exhaust pipe structure of a marine engine according to claim 1, characterized in that: The filter screen has an extended skirt to cover the inner wall of one end of the tube body.

3. The exhaust pipe structure of a marine engine according to claim 2, characterized in that: The filter screen is made of metal.

4. The exhaust pipe structure of a marine engine according to any one of claims 1 to 3, characterized in that: The material of the resistance wire is 0Cr25AL5.

5. The exhaust pipe structure of a marine engine according to any one of claims 1 to 3, characterized in that: Also includes: window frame; The window frame is a ring-shaped structure, the inner ring of the window frame is connected to the outside of one end of the tube body, and the window frame is perpendicular to the tube body.

6. The exhaust pipe structure of a marine engine according to any one of claims 1 to 3, characterized in that: Also includes: Venetian blinds; The venetian blind is connected to the interior of one end of the tube body.

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