A negative pressure bleed air air bubble auxiliary direct axis propeller operation structure for a ship
Patent Information
- Application Number
- CN202522543776.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-01
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-12-01
AI Technical Summary
[0002]现有技术中，为提高螺旋桨的转速，会使螺旋桨推进水的密度减小，然而相同的这种技术大多用在表面桨上，但表面桨是通过万向节改变螺旋桨吃水的深度来实现空气进入的，而这种万向节寿命低，大推力下寿命会更低，为此，我们提出一种船用负压引气空泡辅助直轴螺旋桨运行结构
[0007]通过一根管道从船尾部吸气，利用断阶处的负压把空气吸入，然后在螺旋桨根部释放出来，使其在螺旋桨周围的水产生一些空泡，从而使螺旋桨推进水的密度减小，以便提高螺旋桨的转速，让发动机的功率得到更高发挥，通过导气管利用断阶航行时自然形成的负压，实现空气吸入，既增加了使用寿命，又实现了固定桨来达到表面桨运行的效果。
Smart Images
Figure CN224782282U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of propeller technology, and in particular to a marine negative pressure bleed air cavitation-assisted straight shaft propeller operation structure. Background Technology
[0002] In existing technologies, to increase the propeller speed, the density of the water propelled by the propeller is reduced. However, this same technology is mostly used on surface propellers. Surface propellers achieve air intake by changing the propeller's draft through a universal joint. However, the lifespan of such universal joints is short, and the lifespan will be even shorter under high thrust. Therefore, we propose a marine negative pressure bleed air cavitation-assisted straight-shaft propeller operation structure. Utility Model Content
[0003] This invention provides a marine negative pressure bleed air cavitation-assisted straight shaft propeller operation structure, which solves the above-mentioned technical problems.
[0004] The solution of this utility model to solve the above-mentioned technical problems is as follows: A marine negative pressure induced air cavitation assisted straight shaft propeller operation structure includes a hull, a propeller is provided at the lower part of the hull, an auxiliary support is fixedly installed at the lower part of the hull, the auxiliary support is rotatably sleeved on the outer wall of the propeller, and a pipe penetrating the hull is provided at the stern of the hull.
[0005] Preferably, the pipe has an L-shaped cross-section, and the lower end of the pipe is located above the propeller.
[0006] The beneficial effects of this utility model are:
[0007] Air is drawn in from the stern through a pipe, utilizing the negative pressure at the break in the propeller. The air is then released at the root of the propeller, creating cavitation bubbles in the water around it. This reduces the density of the water propelled by the propeller, increasing its rotational speed and allowing the engine to operate at higher power. By using the negative pressure naturally generated during break-in navigation through the air duct, air intake is achieved, which increases the lifespan of the propeller and allows the fixed propeller to achieve the effect of a surface propeller.
[0008] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description
[0009] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0010] Figure 1 This utility model provides an overall structural diagram of a marine negative pressure bleed air cavitation-assisted straight shaft propeller operation structure;
[0011] Figure 2 This utility model presents a schematic diagram of the hull cross-section structure of a marine negative pressure bleed air cavitation-assisted straight shaft propeller operation structure.
[0012] Legend:
[0013] 1. Hull; 2. Propeller; 3. Auxiliary support; 4. Pipeline. Detailed Implementation
[0014] The following is in conjunction with the appendix Figure 1-2 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.
[0015] like Figure 1-2 As shown, this utility model discloses a marine negative pressure induced air cavitation assisted straight-shaft propeller operation structure, including a hull 1, a propeller 2 disposed at the lower part of the hull 1, an auxiliary support 3 fixedly installed at the lower part of the hull 1, the auxiliary support 3 being rotatably sleeved on the outer wall of the propeller 2, and a pipe 4 penetrating the hull 1 at the stern, with an air guide pipe installed inside the pipe 4. The air guide pipe is used to assist air in being drawn in from the stern of the hull 1 and discharged from the lower part of the pipe 4, ensuring airflow to achieve the effect of the device. This device uses air pressure difference to draw air in from the inlet of the pipe 4 at the stern of the hull 1 and discharge it from the outlet of the pipe 4 at the lower part of the hull 1, generating bubbles around the propeller 2, reducing the density of the propulsion water of the propeller 2, increasing the speed of the propeller 2, thus increasing its service life and achieving the effect of a surface propeller operation with a fixed propeller.
[0016] Specifically, the cross-section of pipe 4 is L-shaped, and the lower end of pipe 4 is located above propeller 2, ensuring that the air discharged from the lower part of pipe 4 can reduce the density of water propelled by propeller 2 and increase the rotational speed of propeller 2.
[0017] Working principle:
[0018] When the hull 1 moves and propels, the propeller 2 rotates continuously. Air enters through the pipe 4 at the stern of the hull 1 and exits through the pipe 4 at the bottom of the hull 1, forming bubbles near the propeller 2. This reduces the density of the propulsion water near the propeller 2 and reduces the pressure near the propeller 2, allowing air to continuously enter and form bubbles. This continuous intake of air increases the rotational speed of the propeller 2 and extends its service life.
[0019] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.
Claims
1. A marine negative pressure bleed air assisted linear propeller operation structure, comprising a hull (1), characterized in that: The lower part of the hull (1) is provided with a propeller (2), and an auxiliary bracket (3) is fixedly installed on the lower part of the hull (1). The auxiliary bracket (3) is rotatably sleeved on the outer wall of the propeller (2). A pipe (4) is opened at the stern of the hull (1) and passes through the hull (1).
2. The marine negative pressure bleed air assisted linear propeller operation structure according to claim 1, characterized in that: The pipe (4) has an L-shaped cross section, and the lower port of the pipe (4) is located above the propeller (2).