A marine stealth ventilation grille and method of installation

Abstract

The application discloses a marine stealth ventilation grille and an installation method, which comprises a cover plate, a connecting frame, a fixed louver and a fixed bottom frame. The fixed louver is fixed at the middle position of the fixed bottom frame. The bottom edge of the connecting frame is fixedly connected with the side edge of the fixed frame. The cover plate is fixedly connected with the top edge of the connecting frame. A plurality of ventilation holes are arranged on the connecting frame and form a ventilation path with the fixed louver. The main material of the application is a non-metal material, which is light in weight, high in structural strength and obviously reduces the RCS.

Description

Technical Field

[0001] This invention belongs to the technical field of ship ventilation facilities, and particularly relates to a shipborne stealth ventilation grille and its installation method. Background Technology

[0002] Marine ventilation wells require external air intake and exhaust systems on the deck. Currently, the marine industry commonly uses gooseneck vents and mushroom-shaped vent caps for external air intake and exhaust. These devices are numerous and distributed throughout the ship, and their shapes are incompatible with the hull plating, creating multiple small scattering sources that negatively impact the ship's radar cross section (RCS) performance. As military vessels increasingly demand radar stealth capabilities for deck equipment, stealth ventilation grilles are gradually being adopted for deck air intake and exhaust systems. However, currently common stealth ventilation grilles are primarily made of stainless steel, which is highly susceptible to corrosion under wave conditions. Furthermore, stainless steel is heavy, increasing the ship's weight load. Since stealth grilles are installed on the deck, sufficient structural strength is required to withstand wave impacts.

[0003] Based on the above situation, it is necessary to propose a stealthy ventilation grille based on a new type of composite material. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a marine stealth ventilation grille and its installation method, which uses composite materials to make the main structure, thereby reducing the overall weight and resisting seawater corrosion.

[0005] The embodiments of this application are implemented as follows: This application provides a marine stealth ventilation grille, characterized in that it includes a cover plate, a connecting frame, fixed louvers, and a fixed bottom frame. The fixed louvers are fixed to the middle position of the fixed bottom frame. The bottom edge of the connecting frame is fixedly connected to the side edge of the fixed frame. The cover plate is fixedly connected to the top edge of the connecting frame. The connecting frame is provided with multiple ventilation holes to form a ventilation path with the fixed louvers. The fixed frame is fixedly connected to the ventilation shaft.

[0006] In some alternative implementations, the cover plate is a shell structure with four sides that are bent downwards and inwards.

[0007] In some optional embodiments, the connecting frame includes a rectangular frame and a left connecting frame and a right connecting frame symmetrically arranged corresponding to the rectangular frame. The left and right connecting frames are provided with an upper connecting flange and a lower connecting flange. The upper connecting flange is connected to the cover plate, and the lower connecting flange is connected to the fixed base frame. The left and right connecting frames are provided with a plurality of ventilation holes.

[0008] In some alternative implementations, the side of the fixed louver facing the cover plate is covered with a concealed mesh, which is connected to the fixed base frame by fasteners.

[0009] In some alternative implementations, both the left and right connecting frames are tilted and arranged in an inverted V-shape.

[0010] In some alternative embodiments, the connecting frames are all integrally molded from glass fiber reinforced composite material.

[0011] In some alternative implementations, the stealth mesh is a mesh structure made of titanium alloy or copper.

[0012] In some alternative embodiments, the back of the cover plate is provided with crisscrossing reinforcing ribs.

[0013] In some alternative implementations, the fastener is a bolt.

[0014] A method for installing a marine stealth ventilation grille, characterized by comprising the following: The top of the connecting frame is connected to the cover plate by bolts, and the bottom of the connecting frame is connected to the fixed bottom frame by bolts. The fixed louvers are connected to the fixed bottom frame by bolts. The side of the fixed louvers facing the cover plate is covered with a concealed mesh and connected to the fixed bottom frame by bolts. The fixed bottom frame is welded to the ventilation shaft. The air in the ventilation shaft reaches the connecting frame through the ventilation fixed louvers, and then achieves the purpose of external ventilation through the ventilation holes and openings on both sides of the connecting frame.

[0015] The beneficial effects of this application are: 1. The marine stealth ventilation grille and installation method provided in this application are made of non-metallic materials, which are more resistant to seawater corrosion and more suitable for the environmental conditions of deck layout; 2. Due to the use of new composite materials, the overall weight is lighter than that of stainless steel ventilation grilles, making it easier to install manually and occupying less overall weight resources; 3. The overall design adopts an inverted form, and the main body is integrally molded with fiberglass composite material, resulting in high overall structural strength and making it more suitable for the environmental conditions of wave impact. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view of the ventilation grille according to an embodiment of this application; Figure 2 This is a side view of the ventilation grille according to an embodiment of this application; Figure 3 This is a schematic diagram of the connecting frame according to an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] It should be understood that the sequence number of each step in the embodiment does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0026] like Figures 1-3 As shown, this embodiment discloses a marine stealth ventilation grille, including a cover plate 1, a connecting frame 2, a fixed louver 3, and a fixed bottom frame 4. The fixed louver is fixed in the middle of the fixed bottom frame, the bottom edge of the connecting frame is fixedly connected to the side of the fixed frame, the cover plate is fixedly connected to the top edge of the connecting frame, the connecting frame is provided with multiple ventilation holes 5, forming a ventilation path with the fixed louver, and the fixed frame is fixedly connected to the ventilation well.

[0027] Furthermore, the cover plate is a shell structure with four sides that bend downwards and inwards, and the back of the cover plate is provided with crisscrossing reinforcing ribs. The cover plate is inverted and has a sloping transition on all four sides, which can effectively change the scattering direction of radar waves and avoid generating specular scattering echoes with strong signal characteristics, thus playing a significant role in reducing RCS.

[0028] Furthermore, the connecting frame includes a rectangular frame 21, and a left connecting frame 22 and a right connecting frame 23 symmetrically arranged corresponding to the rectangular frame. The left and right connecting frames have upper and lower connecting flanges. The upper connecting flange connects to the cover plate, and the lower connecting flange connects to the fixed base frame. Multiple ventilation holes are provided on the left and right connecting frames. Both the left and right connecting frames are inclined, forming an inverted V-shape. The connecting frame is integrally molded from glass fiber reinforced composite material. Glass fiber has high strength, with both its proportional limit and ultimate tensile strength at 3430 MPa, far exceeding that of stainless steel (proportional limit 196 MPa, ultimate tensile strength 402 MPa). The integrally molded structure has high overall strength and is more resistant to seawater corrosion, making it more suitable for the environmental conditions of deck layout.

[0029] Furthermore, the side of the fixed louver facing the cover plate is covered with a concealed mesh 6. The concealed mesh is connected to the fixed bottom frame by fasteners, preferably bolts. The concealed mesh is a mesh structure made of titanium alloy or copper, which can effectively reduce the RCS value while ensuring the flow area.

[0030] Example 1 The connecting frame is made of prepreg (glass fiber + epoxy resin), model G-24# black epoxy cloth, with a standard resin content of 32±3%. It is 17.69% lighter than stainless steel ventilation grilles. Its main performance characteristics are shown in the table below: Table 1. Performance and Comparison of Fiberglass and Stainless Steel

[0031] Example 2 A cover plate was added to the outside of the traditional weatherproof louver to reduce cavity reflection and other reflections. The inside adopts a concealed mesh design, which can effectively reduce the overall RCS while ensuring the airflow area.

[0032] Taking an 800x350mm ventilation grille as an example, the theoretical reflective area of ​​the ventilation grille is 0.28m². 2 The 800x350mm concealed ventilation grille has an average RCS of 0.0409169m. 2 .

[0033] In use, the top of the connecting frame is connected to the cover plate by bolts, and the bottom of the connecting frame is connected to the fixed base frame by bolts. The fixed louvers are connected to the fixed base frame by bolts. The side of the fixed louvers facing the cover plate is covered with a concealed mesh and connected to the fixed base frame by bolts. The fixed base frame is welded to the ventilation shaft. The air in the ventilation shaft reaches the connecting frame through the ventilation fixed louvers, and then achieves the purpose of external ventilation through the ventilation holes and openings on both sides of the connecting frame.

Claims

1. A marine stealth ventilation grille, characterized in that, It includes a cover plate, a connecting frame, a fixed louver, and a fixed bottom frame. The fixed louver is fixed in the middle of the fixed bottom frame. The bottom edge of the connecting frame is fixedly connected to the side edge of the fixed frame. The cover plate is fixedly connected to the top edge of the connecting frame. The connecting frame is provided with multiple ventilation holes to form a ventilation path with the fixed louver. The fixed frame is fixedly connected to the ventilation shaft.

2. The marine stealth ventilation grille according to claim 1, characterized in that, The cover plate is a shell structure with its four sides inclined downwards and inwards, bending and transitioning.

3. A marine stealth ventilation grille according to claim 1 or 2, characterized in that, The connecting frame includes a rectangular frame and a left connecting frame and a right connecting frame symmetrically arranged corresponding to the rectangular frame. The left and right connecting frames are provided with an upper connecting fold and a lower connecting fold. The upper connecting fold is connected to the cover plate, and the lower connecting fold is connected to the fixed base frame. The left and right connecting frames are provided with a plurality of ventilation holes.

4. A marine stealth ventilation grille according to claim 3, characterized in that, The fixed louver is covered with a concealed mesh on the side facing the cover plate, and the concealed mesh is connected to the fixed bottom frame by fasteners.

5. A marine stealth ventilation grille according to claim 4, characterized in that, Both the left and right connecting frames are tilted, forming an inverted V-shape.

6. A marine stealth ventilation grille according to claim 5, characterized in that, The connecting frames are all integrally molded from glass fiber reinforced composite material.

7. A marine stealth ventilation grille according to claim 6, characterized in that, The stealth mesh is a mesh structure made of titanium alloy or copper.

8. A marine stealth ventilation grille according to claim 2 or 7, characterized in that, The back of the cover plate is provided with crisscrossing reinforcing ribs.

9. A marine stealth ventilation grille according to claim 8, characterized in that, The fastener is a bolt.

10. The installation method of the marine stealth ventilation grille according to claim 7, characterized in that, Includes the following: The top of the connecting frame is connected to the cover plate by bolts, and the bottom of the connecting frame is connected to the fixed bottom frame by bolts. The fixed louvers are connected to the fixed bottom frame by bolts. The side of the fixed louvers facing the cover plate is covered with a concealed mesh and connected to the fixed bottom frame by bolts. The fixed bottom frame is welded to the ventilation shaft. The air in the ventilation shaft reaches the connecting frame through the ventilation fixed louvers, and then achieves the purpose of external ventilation through the ventilation holes and openings on both sides of the connecting frame.

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