Novel hollow propeller for ship

Abstract

The novel hollowed-out propeller comprises propeller blades, a propeller hub and hollowed-out holes, the propeller hub is installed on a driving shaft, the propeller blades are fixed to the outer side of the propeller hub, each propeller blade comprises a propeller blade following edge and a propeller blade guiding edge, each propeller blade comprises a blade back and a blade surface, and the blade surfaces are arranged on the blade back. And hollow holes are formed in the propeller blades. According to the novel hollowed-out propeller for the ship, fluid flows to the blade back from the blade surface through the hollowed-out holes, the fluid at the blade back is accelerated, the speed of airflow in a boundary layer of the blade back is increased, the pressure intensity is reduced, and therefore rotating vortexes near a guide edge are delayed or eliminated, and cavitation is reduced. And the falling of the tip vortex is delayed, the energy loss is reduced, the noise and vibration generated by the paddle are reduced while the efficiency is improved in the propulsion process of the ship, and the energy-saving and low-noise operation of the ship is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of ship propellers, in particular to a novel hollow propeller for ships. Background Art

[0002] A propeller is a key mechanical component that converts the engine's mechanical energy into propulsion, thereby moving ships, aircraft, or other vehicles. Its operating principle is based on fluid dynamics, with rotating blades generating thrust in the air or water, achieving propulsion. Marine vessels, fishing boats, yachts, and submarines all use propellers as their primary propulsion device. Propellers are essential mechanical components that use rotation to generate thrust from fluids. Their design, materials, and maintenance are directly related to the performance and safety of the vehicle. With advances in materials science and fluid dynamics, modern propeller technology continues to improve, enabling more efficient and environmentally friendly propulsion solutions.

[0003] Traditional propellers usually consist of 2 to 5 blades, which are shaped like spiral wings. The hub connects the blades to the center of the power shaft, carries torque and transmits power. Bearings and seals ensure smooth rotation of the propeller shaft and prevent fluid leakage. Conventional propellers have no slits, and flow separation is prone to occur on the back of the blades, which causes a sharp drop in lift. At the same time, turbulence causes random force pulsations, which can induce adverse effects such as radiation noise. Therefore, a new hollow propeller for ships is designed to solve the above problems, which has the function of delaying or eliminating the rotating vortex near the guide edge, reducing the harmfulness of cavitation, achieving energy saving and high efficiency, and effectively reducing noise and vibration. Summary of the Invention

[0004] The purpose of the present invention is to provide a new type of hollow propeller for ships to solve the problem that the existing propellers proposed in the above background technology are not convenient for delaying or eliminating the rotating vortex near the guide edge and reducing the harmfulness of cavitation phenomenon. The technical solution of the present invention is aimed at the technical problem that the existing technical solution is too single, and provides a solution that is significantly different from the existing technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a new hollow propeller for a ship, comprising a propeller blade, a hub and a hollow hole, wherein the hub is mounted on a drive shaft, and a propeller blade is fixed to the outside of the hub, wherein the propeller blade comprises a blade following edge and a blade leading edge, wherein the propeller blade comprises a blade back and a blade surface, and a hollow hole is formed on the propeller blade.

[0006] Preferably, the propeller blades adopt a closed structure, and the propeller blades are distributed at equal angles on the outer surface of the hub in a centrally symmetrical manner.

[0007] Preferably, four propeller blades are provided.

[0008] Preferably, the hollow hole is arranged beside the blade guide edge of the propeller blade, and passes through from the blade surface to the blade back.

[0009] Preferably, the hollow hole is located near the leading edge of the blade and is arranged at r / R=0.25-0.95 of the propeller blade.

[0010] Preferably, the specifications of the hollow hole opening are repeated on each propeller blade.

[0011] Preferably, the optimal position and arrangement of the hollow holes are determined by CFD simulation or experimental testing methods.

[0012] Compared with the prior art, the present invention has the following beneficial effects: By opening a hollow hole near the leading edge of the propeller blade, part of the fluid flows from the pressure side to the suction side, reducing the flow velocity on the pressure side near the hole, while accelerating the flow velocity near the suction side surface, increasing the speed of the airflow in the boundary layer on the back of the blade, reducing the pressure, and effectively delaying the stall phenomenon, which is beneficial to improving the efficiency of the propeller. It can effectively reduce the separation of the fluid on the back of the blade, delay or eliminate the rotating vortex near the leading edge of the blade, reduce torque, reduce energy loss, reduce irregular jitter, effectively improve the lift coefficient, delay the shedding of the tip vortex, and improve the efficiency of the ship during propulsion while reducing the noise and vibration generated by the blades, thereby achieving energy saving and low-noise operation of the ship. When the traditional propeller is working, the lift drops sharply and the vibration amplitude is large, which affects the efficiency of the propeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an overall schematic diagram of the hollow propeller of the present invention; Figure 2 This is a schematic diagram of a hollow propeller blade according to the present invention; Figure 3 Schematic diagram of the hollow propeller blade surface and hollow holes of the present invention; Figure 4 This is a schematic diagram of the hollow propeller blade back and hollow hole of the present invention.

[0014] In the figure: 1. Propeller blade; 2. Hub; 3. Blade trailing edge; 4. Blade leading edge; 5. Hollow hole; 6. Blade back; 7. Blade surface. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] See also Figure 1-4 The present invention provides a technical solution: a novel hollow propeller for a ship, comprising a propeller blade 1, a hub 2 and a hollow hole 5, wherein the hub 2 is mounted on a drive shaft, and the propeller blade 1 is fixed to the outside of the hub 2, wherein the propeller blade 1 comprises a blade trailing edge 3 and a blade leading edge 4, the propeller blade 1 comprises a blade back 6 and a blade surface 7, and the hollow hole 5 is formed on the propeller blade 1; the propeller blade 1 adopts a closed structure, and the propeller blades 1 are distributed at equal angles on the outer surface of the hub 2 in a centrally symmetrical manner; four propeller blades 1 are provided; Due to the special slotted structure near the propeller blade 1, part of the fluid flows from the pressure side to the suction side, reducing the flow velocity on the pressure side near the hollow hole 5, while accelerating the flow near the suction side. This effectively delays the stall phenomenon, thereby delaying or eliminating the rotating vortex near the leading edge, reducing cavitation, lowering torque, and reducing irregular vibration, thereby improving the efficiency of the propeller. In the embodiment of the present invention, the hollow hole 5 is arranged beside the blade leading edge 4 of the propeller blade 1, and penetrates from the blade surface 7 to the blade back 6; cavitation is easily generated at the blade back 6, and hollowing can greatly reduce cavitation.

[0017] In an embodiment of the present invention, the hollow hole 5 is located near the blade guide edge 4 and is arranged at r / R=0.25-0.95 on the propeller blade 1; the specifications of the opening of the hollow hole 5 are repeatedly set on each propeller blade 1; the optimal position and arrangement of the hollow hole 5 are determined by CFD simulation or experimental testing methods; the torque of the propeller is effectively reduced. This design enables the hollow propeller to improve efficiency in ship propulsion while reducing noise and vibration generated by the propeller blade 1, thereby achieving energy-saving and low-noise operation of the ship.

[0018] Any content not described in detail in this specification is prior art known to those skilled in the art. In the description of the present invention, unless otherwise specified, "plurality" means two or more. Terms such as "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings and are intended solely for ease of description and simplification. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation and are therefore not to be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified or limited, the terms "connected" and "connected" are to be understood broadly, meaning, for example, fixedly connected, detachably connected, or integrally connected; mechanically connected, electrically connected; directly connected, or indirectly connected through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention on a case-by-case basis.

[0019] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A new hollow propeller for ships, characterized by: It comprises a propeller blade (1), a propeller hub (2) and a hollow hole (5); A propeller hub (2), the propeller hub (2) being mounted on the drive shaft, and a propeller blade (1) being fixed on the outside of the propeller hub (2); A propeller blade (1), the propeller blade (1) comprising a blade trailing edge (3) and a blade leading edge (4), the propeller blade (1) comprising a blade back (6) and a blade surface (7); A hollow hole (5), wherein the propeller blade (1) is provided with a hollow hole (5).

2. A novel hollow propeller for ships according to claim 1, characterized in that: The propeller blades (1) adopt a closed structure, and the propeller blades (1) are distributed at equal angles on the outer surface of the hub (2) in a centrally symmetrical manner.

3. The novel hollow propeller for ships according to claim 1, characterized in that: The propeller blades (1) are provided with four.

4. The novel hollow propeller for ships according to claim 1, characterized in that: The hollow hole (5) is arranged beside the blade guide edge (4) of the propeller blade (1), and penetrates from the blade surface (7) to the blade back (6).

5. The novel hollow propeller for ships according to claim 1, characterized in that: The hollow hole (5) is located near the blade guide edge (4) and is arranged at a position where r / R=0.25-0.95 of the propeller blade (1).

6. The novel hollow propeller for ships according to claim 1, characterized in that: The specifications of the opening of the hollow hole (5) are repeatedly set on each propeller blade (1).

7. The novel hollow propeller for ships according to claim 1, characterized in that: The optimal position and arrangement of the hollow holes (5) are determined by CFD simulation or experimental testing methods.

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