Underwater vehicle with rear-mounted shaftless rim propeller

Abstract

The utility model discloses an underwater vehicle with a rear-mounted shaftless rim propeller. The underwater vehicle is provided with a boat body, the shaftless rim propeller and four tail vanes distributed in a cross shape. The tail vane is arranged at the tail end of the boat body and is provided with a fixed part and a rotating part, the fixed part is rigidly connected with the boat body, the rotating part is rotationally connected into a groove formed in the front part of the top end of the fixed part through a rudder shaft, and the groove is matched with the rotating part; the rudder shaft penetrates through the fixed part and is connected with the output end of a steering engine in a cabin at the tail of the boat body; the shaftless rim propeller is arranged on the rear side of the tail vanes and fixedly connected with the fixed parts of the four tail vanes through connecting pieces. The shaftless rim propeller is arranged at the rear, so that the propelling efficiency and the flow field characteristic are optimized; the rotating part of the tail vane is arranged in front, so that the response and control precision of the vane surface is improved.

Description

Technical Field

[0001] This utility model relates to underwater vehicles, specifically to an underwater vehicle with a rear-mounted shaftless rim propulsion system. Background Technology

[0002] Axleless rim propulsion systems are simpler in structure, lighter in weight, and have lower noise and vibration levels than traditional shafted propulsion systems, making them an ideal propulsion form for underwater vehicles.

[0003] CN109110096A discloses a novel shaftless pump-jet propulsion system and an underwater vehicle containing the same propulsion system. The system places the shaftless pump-jet propulsion system at the front, causing the high-speed rotating wake generated by the propulsion to directly act on the tail rudder steering structure behind the propulsion. This results in weakened tail rudder handling performance under the interference of changing flow fields, manifesting as delayed control response, reduced steering efficiency, and decreased steering accuracy. This wake interference not only affects the vehicle's maneuverability at high speeds but may also lead to a decrease in navigation stability.

[0004] On the other hand, the tail rudder of traditional underwater vehicles is usually a single unit. A few, while employing a split structure, have the rotating part positioned at the rear, such as CN110641663B. This rearward positioning of the rotating part prolongs the tail rudder's steering response path, complicates the transmission and control mechanism, and easily increases system weight and mechanical losses. Furthermore, the tail rudder is located in the wake of the propeller's motion, subject to strong non-uniform flow field interference. The rearward rotating structure may also increase hydrodynamic drag due to local flow separation and eddies, weakening the actual effectiveness of the rudder surface deflection, resulting in insufficient control precision, and reducing the overall propulsion efficiency and stability of the vessel. Utility Model Content

[0005] Purpose of the utility model: The purpose of this utility model is to provide an underwater vehicle with a rear-mounted shaftless rim propeller and better maneuverability.

[0006] Technical Solution: This utility model discloses an underwater vehicle with a rear-mounted shaftless rim propeller, comprising a hull, a shaftless rim propeller, and four rudders arranged in a cross shape. The rudders are located at the very end of the hull and have a fixed part and a rotating part. The fixed part is rigidly connected to the hull, and the rotating part is rotatably connected to a groove at the front of the top of the fixed part via a rudder shaft. The groove is adapted to the rotating part. The rudder shaft passes through the fixed part and is connected to the output end of a rudder motor in the stern compartment of the hull. The shaftless rim propeller is located behind the rudder and is fixedly connected to the fixed part of the four rudders via a connector.

[0007] Furthermore, the two ends of the connector are welded to the fixed part and the shaftless wheel rim propeller, respectively.

[0008] Furthermore, the tail of the fixed part is embedded in the front of the connector, and the rear of the connector is tightly fitted with the front of the shaftless wheel rim pusher.

[0009] Furthermore, the fixed part is equipped with a bearing for rotating the rudder shaft.

[0010] Furthermore, of the four tail rudders, the two horizontal rudders share one servo, and the two vertical rudders share another servo.

[0011] Furthermore, the hull has a long, streamlined shape.

[0012] Furthermore, the shaftless rim propeller has four propeller blades.

[0013] Beneficial effects: Compared with the prior art, this utility model has the following advantages:

[0014] This invention addresses the problems of severe wake interference, sluggish control surface response, low propulsion efficiency, and insufficient overall stability in existing technologies. It proposes an underwater vehicle solution based on a rear-mounted shaftless rim thruster and a split tail rudder structure. Compared with existing technologies, it has the following advantages:

[0015] (1) Rear-mounted shaftless rim-driven propulsion system optimizes propulsion efficiency and flow field characteristics. A shaftless rim-driven propulsion system is employed and positioned at the stern of the underwater vehicle. Unlike the front-mounted propulsion systems in existing technologies, this layout avoids the direct impact of the propulsion's high-speed wake on the control surfaces, allowing the control surfaces to operate in a clean flow field, significantly improving control effectiveness and directional stability. This rear-mounted layout also enables the propulsion system to directly apply thrust to the stern of the hull, enhancing propulsion efficiency and the effectiveness of power transmission.

[0016] (2) The rotating part of the tail rudder is positioned at the front to improve the response and control accuracy of the control surface. This invention positions the rotating part of the split tail rudder at the front, allowing it to operate directly in a relatively uniform and clean incoming flow that is not disturbed by the propeller wake. This arrangement can effectively avoid the aerodynamic (fluid) interference problem of the tail rudder in a non-uniform wake, so that the control surface can maintain stable lift and control force output over a wide range of control angles, thereby significantly improving the response speed and control accuracy of the servo motor.

[0017] (3) The split tail rudder improves maneuverability by connecting the hull with a welded structure. In the split tail rudder design, the forward rudder surface can rotate flexibly within a certain range, while the rear part is fixed to the very end of the hull, forming a stable stern support structure. This split layout not only increases the effective rudder force of the rudder surface and improves steering efficiency, but also reduces the heel moment and tail weight distribution during turns, improving the overall center of gravity and hydrodynamic balance of the vessel. The integral rigid connection formed by welding further enhances the structural strength and durability, giving the entire tail rudder-propulsion system higher dynamic stability and precise control capabilities. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an underwater vehicle with a rear-mounted shaftless rim propeller provided in an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the tail structure of the underwater vehicle in an embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the split tail rudder structure in an embodiment of this utility model;

[0021] Figure 4 This is a cross-sectional view of the split tail rudder in an embodiment of this utility model. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Appendix Figures 1 to 4 The accompanying figure labels are as follows:

[0024] 1. Hull; 2. Tail rudder; 21. Fixed part; 22. Rudder shaft; 23. Rotating part; 24 / 25. Bearing; 3. Shaftless rim propulsion; 4. Connecting parts.

[0025] like Figure 1 and Figure 2 As shown, this utility model embodiment provides an underwater vehicle with a rear-mounted shaftless rim propeller, which has a hull 1, a shaftless rim propeller 3 (the shaftless rim propeller 3 is the prior art) and four tail rudders 2 arranged in a cross shape. The hull 1 is long and streamlined, the tail rudders 2 are located at the far end of the constricted part of the hull 1, and the shaftless rim propellers 3 are located behind the tail rudders 2.

[0026] Specifically, in combination Figure 3 and Figure 4 The tail rudder 2 has a fixed part 21 and a rotating part 23. The fixed part 21 is welded to the hull 1. The rotating part 23 is rotatably connected to a groove at the front of the top of the fixed part 21 via a rudder shaft 22. The groove is adapted to fit the rotating part 23. The rudder shaft 22 passes through the fixed part 21 and is connected to the output end of the rudder motor in the stern compartment of the hull 1. Two bearings for rotating the rudder shaft 22 are spaced apart inside the fixed part 21 to reduce the friction generated by the rotation of the rudder shaft 22. Of the four tail rudders 2, the two horizontal rudders share one rudder motor, and the two vertical rudders share another rudder motor. The fixed part 21 constitutes a non-rotatable rear support structure, and the rotating part 23 serves as the forward rotatable rudder body.

[0027] The shaftless rim thruster 3 is fixedly connected to the fixed parts 21 of the four tail rudders 2 via connectors 4. Specifically, both ends of the connectors 4 are welded to the fixed parts 21 and the shaftless rim thruster 3, respectively. The tail of the fixed part 21 is embedded in the front of the connector 4, and the rear of the connector 4 is tightly fitted to the front of the shaftless rim thruster 3 (the front surface of the thruster guide tube). This increases the contact area of ​​the weld, making the structure more stable.

[0028] In this embodiment, the shaftless rim propeller 3 has four propeller blades.

Claims

1. An underwater vehicle with a rear-mounted, shaftless rim-driven propeller, characterized in that, It has a hull (1), a shaftless rim propeller (3) and four rudders (2) arranged in a cross shape; the rudders (2) are located at the far end of the hull (1) and have a fixed part (21) and a rotating part (23). The fixed part (21) is rigidly connected to the hull (1), and the rotating part (23) is rotatably connected to a groove opened at the front of the top of the fixed part (21) through a rudder shaft (22). The groove is adapted to the rotating part (23); the rudder shaft (22) passes through the fixed part (21) and is connected to the output end of the rudder in the stern compartment of the hull (1); the shaftless rim propeller (3) is located on the rear side of the rudder (2) and is fixedly connected to the fixed part (21) of the four rudders (2) through a connector (4).

2. The underwater vehicle with a rear-mounted shaftless rim propeller according to claim 1, characterized in that, The two ends of the connector (4) are welded to the fixed part (21) and the shaftless wheel rim propeller (3), respectively.

3. The underwater vehicle with a rear-mounted shaftless rim propeller according to claim 2, characterized in that, The tail of the fixed part (21) is embedded in the front of the connector (4), and the rear of the connector (4) is closely fitted with the front of the shaftless wheel rim propeller (3).

4. The underwater vehicle with a rear-mounted shaftless rim propeller according to claim 1, characterized in that, The fixed part (21) is equipped with a bearing for rotating the rudder shaft (22).

5. The underwater vehicle with a rear-mounted shaftless rim propeller according to claim 1, characterized in that, Of the four tail rudders (2), two horizontal rudders share one servo motor, and two vertical rudders share another servo motor.

6. The underwater vehicle with a rear-mounted shaftless rim propeller according to claim 1, characterized in that, The hull (1) is long and streamlined.

7. The underwater vehicle with a rear-mounted shaftless rim propeller according to claim 1, characterized in that, The shaftless rim propeller (3) has 4 propeller blades.

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