Air inlet prevention structure for water surface vehicle

Abstract

An air inlet prevention structure for a water surface vehicle comprises a hollow machine shell, a water spraying propeller is installed in the machine shell, a spray head is fixedly installed on the left side face of the machine shell, the left end of the spray head is open, and the spraying end of the water spraying propeller is installed in the spray head; a driving motor and a power supply which are used for operating the water-jet propeller are mounted in the shell; a water inlet grid is fixedly installed at the bottom of the machine shell, an inner cavity of the machine shell is communicated with the outside through the water inlet grid, and water retaining wing plates are arranged below the front side face and the rear side face of the machine shell. The water-jet propeller overcomes the defects in the prior art, air can be effectively prevented from entering the shell, stable operation of the water-jet propeller is ensured, and controllability and safety of an aircraft are improved.

Description

Technical Field

[0001] This utility model relates to the field of surface navigation equipment technology, and specifically to an anti-air intake structure for surface vehicles. Background Technology

[0002] A waterjet propulsion system is a type of propulsion device in which the jetting part of the propulsion mechanism is immersed in water, using the reaction force generated by the jetting water to propel the ship forward. It consists of a water pump, pipes, suction inlet, and nozzle, and can control the ship by changing the direction of the water jet through the nozzle. While its efficiency is lower than that of a propeller, it offers superior maneuverability, and is particularly well-suited for shallow waterways with muddy or sandy bottoms.

[0003] Currently, the water inlet of waterjet propulsion systems is typically located on the side. Therefore, when a surface vessel is navigating at high speed, turning, overtaking waves, or experiencing pitching / rolling (usually >8°) due to wind and waves, the water inlet easily exposes itself above the water surface and draws in air. This air intake creates a two-phase flow, causing a sudden change in propeller thrust. Consequently, the impeller propulsion efficiency in the waterjet propulsion system is significantly reduced. Furthermore, continuous air intake can easily lead to cavitation collapse, causing cavitation vibrations that can damage the impeller structure and affect the stability and safety of the vessel. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an air-intake prevention structure for surface vehicles. It overcomes the deficiencies of existing technologies, is reasonably designed, and can effectively prevent air from entering the casing, ensuring stable operation of the waterjet propulsion system and improving the vehicle's maneuverability and safety.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An anti-air intake structure for a surface vehicle includes a hollow hull, inside which a water jet propulsion unit is installed. A nozzle is fixedly installed on the left side of the hull, with an opening at its left end. The spray end of the water jet propulsion unit is installed inside the nozzle. A drive motor and a power supply for operating the water jet propulsion unit are installed inside the hull. A water inlet grid is fixedly installed at the bottom of the hull, and the inner cavity of the hull is connected to the outside through the water inlet grid. Water deflectors are provided on the lower sides of both the front and rear sides of the hull.

[0007] Preferably, the water inlet grid and the water baffle are an integral structure, and the water baffle is respectively arranged on the front and rear sides of the water inlet grid.

[0008] Preferably, an arc-shaped guide surface is provided at the corner of the front side of the water-blocking wing plate.

[0009] This invention provides an anti-air intake structure for surface vehicles, offering the following advantages: By installing water deflectors on the lower sides of both the front and rear sides of the fuselage, the water deflectors laterally widen the shielding area, acting as a barrier between the air above and the water flow below. When the surface vehicle turns or encounters waves, the water deflectors on both sides of the fuselage effectively block the air above, causing it to flow outwards along the deflectors, thus effectively preventing air from entering the fuselage. This ensures stable operation of the waterjet propulsion system and improves the vehicle's maneuverability and safety. Furthermore, the lateral widening of the shielding area by the water deflectors effectively ensures uniform water flow velocity below the water inlet grid, preventing the formation of eddies in localized low-pressure areas, further reducing the risk of air intake, and enhancing the overall hydrodynamic stability of the structure. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of the prior art will be briefly introduced below.

[0011] Figure 1 Structural diagram of this utility model Figure 1 ;

[0012] Figure 2 Structural diagram of this utility model Figure 2 ;

[0013] Explanation of the labels in the diagram:

[0014] 1. Housing; 2. Nozzle; 3. Water inlet grid; 4. Water baffle; 5. Arc-shaped guide surface. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0016] Example 1, as Figures 1-2 As shown, an anti-air intake structure for a surface vehicle includes a hollow housing 1, a water jet propulsion unit installed inside the housing 1, a nozzle 2 fixedly installed on the left side of the housing 1 with an opening at the left end, and the spraying end of the water jet propulsion unit installed inside the nozzle 2; a drive motor and power supply for the operation of the water jet propulsion unit are installed inside the housing 1; a water inlet grid 3 is fixedly installed at the bottom of the housing 1, and the inner cavity of the housing 1 is connected to the outside through the water inlet grid 3; and water deflectors 4 are provided on the lower sides of both the front and rear sides of the housing 1.

[0017] The water jet propeller is prior art, and specifically comprises a water jet impeller and a driving shaft. The output end of the driving motor is in transmission connection with the right end of the driving shaft through a transmission gear. The left end of the driving shaft is connected with the impeller shaft through a shaft coupling. The left end of the impeller shaft is fixedly connected with the water jet impeller. The water jet impeller is located inside the nozzle 2. The driving motor drives the water jet impeller to rotate to generate high-speed water flow which is sprayed out through the nozzle 2 to provide propelling force.

[0018] Working principle:

[0019] In actual use, the whole device can be installed on one side of the bottom of the cabin, so that the casing 1 enters the water, the water inlet grid 3 and the water baffle plate 4 are immersed below the water surface. When the water jet propeller is running, water enters the casing 1 through the water inlet grid 3 at the bottom of the casing 1, is accelerated by the water jet impeller, and is sprayed out from the nozzle 2 to form propelling force.

[0020] In this embodiment, the water baffle plate 4 is arranged below the front and rear sides of the casing 1. The water baffle plate 4 is used as a barrier between the air above and the water below to effectively block the air above when the water surface vehicle turns or encounters waves. The air flows outward along the water baffle plate 4, thereby effectively preventing air from entering the casing. Even if the water baffle plate 4 is temporarily out of the water surface when turning or encountering waves, a water curtain is formed by the attached wall flow at the outer edge of the water baffle plate 4. Therefore, even if the water surface fluctuates, the water curtain still covers the water inlet area to achieve a dynamic sealing effect. Thus, the water jet propeller can be stably operated, and the controllability and safety of the vehicle are improved. The water baffle plate 4 also effectively ensures the uniformization of the water flow speed below the water inlet grid 3, avoids the formation of vortex in the local low pressure area, further reduces the risk of air intake, and enhances the hydrodynamic stability of the overall structure.

[0021] In embodiment two, as a further preferred embodiment of embodiment one, the water inlet grid 3 and the water baffle plate 4 are arranged in an integrated structure. The water baffle plate 4 is arranged on the front and rear sides of the water inlet grid 3. The water inlet grid 3 and the water baffle plate 4 are arranged in an integrated structure, which not only simplifies the installation of components, but also enhances the rigidity of the overall structure, further improving the stability and safety of the vehicle.

[0022] In embodiment three, as a further preferred embodiment of embodiment one, the corner of the front side of the water baffle plate 4 is provided with an arc-shaped flow guide surface 5. The front side of the water baffle plate 4 is arranged as an arc-shaped flow guide surface 5, which can guide the water flow to flow smoothly through the surface of the water baffle plate 4, reduce water flow impact, reduce noise, and improve navigation efficiency.

[0023] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An air intake prevention structure for a water surface vehicle, comprising a hollow casing (1) in which a water jet propeller is installed, a nozzle (2) being fixedly installed on the left side of the casing (1), the nozzle (2) having an opening on the left end, the jetting end of the water jet propeller being installed in the nozzle (2); a driving motor and a power source for the operation of the water jet propeller being installed in the casing (1); characterized in that: The bottom of the shell (1) is fixedly provided with a water inlet grid (3), and the inner cavity of the shell (1) is communicated with the outside through the water inlet grid (3); the lower parts of the front and rear sides of the shell (1) are provided with water blocking wing plates (4).

2. An air intake prevention structure for a watercraft according to claim 1, characterized in that: The water inlet grid (3) and the water blocking wing plate (4) are provided in an integrated structure, and the water blocking wing plates (4) are respectively arranged at the front and rear sides of the water inlet grid (3).

3. A structure for preventing air intake for a watercraft according to claim 1, characterized in that: An arc-shaped flow guide surface (5) is arranged at the corner of the front side of the water blocking wing plate (4).

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