A ship's stealthy vent

Abstract

The application provides a ship stealthy air vent, the air vent structure is inverted trapezoid and inclines downward, comprising a shell, a flow guide plate and a pneumatic closing device; a U-shaped air duct is formed in the shell, after air enters the shell through the air vent, the air passes through a U-shaped passage to enter the inside and then is branched to each ventilation surrounding well or is converged from the ventilation surrounding well and then is discharged through the U-shaped passage; the U-shaped passage is separated by the flow guide plate, near the outlet; the pneumatic closing device is installed above the flow guide plate and is used for cutting off the air vent in the fire-fighting working condition; the shell is coated with a stealthy material on the inside and the outside, so that the radar scattering cross section area of the passage is reduced. The application is ingeniously designed, the louvers are not arranged at the opening, the flow resistance is greatly reduced, in order to reduce the radar scattering cross section area caused by this, the inverted trapezoidal section is selected for the ventilation opening, and the air vent inclines downward, so that the area which is perpendicular to the incident direction of the detection radar is reduced.

Description

Technical Field

[0001] This invention relates to the field of ventilation equipment technology, and in particular to a marine stealth ventilation opening structure. Background Technology

[0002] As ship propulsion system technology advances, the demand for ventilation and heat dissipation in engine rooms is increasing. Currently, most ships use fans to supply and exhaust air in their engine rooms. The increased heat in the engine room not only requires larger ventilation fans but also poses a greater challenge to the ventilation structure. Excessively large ventilation openings not only affect the strength of the hull structure but also increase the radar cross-section, making the ship more vulnerable to detection and attack by the enemy within a certain range. Stealth is crucial for ensuring that ships can be detected and strike first in naval warfare and is also an important condition for improving their survivability. However, if the opening area is too small, the ventilation and heat dissipation of the compartments cannot meet the requirements.

[0003] Therefore, in order to improve the ventilation capacity of the engine room without damaging the hull structure or the stealth performance, this patent provides a concept for a marine stealth ventilation structure. Summary of the Invention

[0004] The purpose of this invention is to provide a stealthy ventilation structure with a low radar cross-section while satisfying ventilation requirements.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A marine stealth ventilation opening is provided, the opening structure being an inverted trapezoidal shape and tilted downwards, with no louvers at the air inlet; it includes a shell, a guide plate, and a pneumatic closing device; a U-shaped air duct is formed inside the shell, after air enters the shell through the opening, it passes through a section of the U-shaped channel into the interior and is then distributed to various ventilation shafts, or it merges from the ventilation shafts and then exits through the U-shaped channel; the U-shaped channel is separated by the guide plate, which, near the outlet, slopes downwards to reduce local resistance caused by bends when guiding airflow, and also allows water to flow out along the guide plate after entering the channel; a pneumatic closing device is installed above the guide plate for shutting off the opening in fire-fighting conditions; both the inner and outer sides of the shell are coated with stealth material to reduce the radar cross-section of the channel.

[0006] Furthermore, it also includes an air inlet mesh, which is installed at the air inlet to prevent debris from entering and clogging the fan.

[0007] Furthermore, the mesh thickness of the air intake wire mesh is moderate.

[0008] The beneficial effects of the marine stealth ventilation opening provided by this invention are:

[0009] This invention features a clever design. The absence of louvers at the opening significantly reduces flow resistance. Furthermore, to minimize the resulting radar cross-section, the ventilation opening has an inverted trapezoidal shape, placing the larger surface area at the top to reduce the area affected by radar rays from the air. The air duct is divided into a U-shaped flow channel by deflectors. This design ensures that seawater entering the vent flows out through the channel instead of entering the ship during navigation. The U-shaped design also minimizes losses during flow. In fire-fighting situations, the vent can be closed using a pneumatic shut-off device. Attached Figure Description

[0010] The invention will be further described below with reference to the accompanying drawings:

[0011] Figure 1 These are front and side views of a marine stealth ventilation structure.

[0012] Figure 2 This is a schematic diagram of the inlet and outlet of the stealth ventilation structure obtained by simulation calculation; 1. Pneumatic closing device; 2. Air inlet mesh; 3. Guide plate; 4. Housing. Detailed Implementation

[0013] The following detailed description of the marine stealth ventilation opening proposed in this invention, in conjunction with the accompanying drawings and specific embodiments, will further illustrate its advantages and features. The advantages and features of this invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the illustration of the embodiments of this invention.

[0014] Figure 1 The structural diagram of the marine stealth ventilation port provided in the embodiment of the present invention includes a shell 4, a guide plate 3, an air inlet mesh 2, and a pneumatic closing device 1.

[0015] A marine stealth ventilation structure includes a shell 4 connected to a cofferdam. Air intake is achieved by diverting air from the shell 4 to each fan duct, while exhaust is achieved by collecting air from the fan ducts back to the shell 4 and then discharging it. The airflow channels within the shell 4 have a U-shaped structure. This design reduces airflow resistance and prevents water from entering the ventilation opening and flowing out along the guide plate 3 during sea navigation. In fire-fighting situations, the ventilation opening can be closed using a pneumatic shut-off device 1.

[0016] The ventilation vent has an inverted trapezoidal opening and no louvers are installed at the vent. This design is to reduce the flow resistance caused by louvers, reduce the area of ​​the detection radar incident on the vent above the vent at a right angle, and reduce the radar cross-section detected from above the vent. An air inlet mesh 2 is installed at the air inlet to prevent debris from entering.

[0017] Simulation calculations were also performed on the drag of the stealth ventilation structure. Figure 2 To obtain the results of the 3D modeling and simulation of this structure in Fluent, the inlet boundary condition was set to a flow velocity of 6 m / s, and the outlet boundary condition was set to a pressure boundary.

[0018] The calculated relative pressures at the inlet and outlet are shown in the appendix. Figure 2 As can be seen from the figure, after the calculation stabilizes, the pressure difference between the inlet and outlet tends to 350 Pa.

[0019] The contents not described in detail in this specification are prior art known to those skilled in the art. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A stealthy marine ventilation opening, characterized in that, The air vent structure is an inverted trapezoid with a downward slope, and no louvers are installed at the air inlet. It includes a shell, a guide plate, and a pneumatic closing device. A U-shaped air duct is formed inside the shell. After air enters the shell through the air vent, it passes through a section of the U-shaped channel into the interior and is then distributed to various ventilation shafts or merges from the ventilation shafts and then exits through the U-shaped channel. The U-shaped channel is separated by the guide plate. Near the outlet, the guide plate is oriented downwards to guide airflow and reduce local resistance caused by bends. At the same time, water enters the channel and then flows out along the guide plate. A pneumatic closing device is installed above the guide plate to shut off the air vent in fire-fighting conditions. The inner and outer sides of the shell are coated with stealth material to reduce the radar cross-section of the channel.

2. The marine stealth ventilation opening as described in claim 1, characterized in that, It also includes an air inlet mesh, which is installed at the air inlet to prevent debris from entering and clogging the fan.

3. The marine stealth ventilation opening as described in claim 1, characterized in that, The mesh thickness of the air intake wire mesh is moderate.

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