Marine twisted rudder
By designing a segmented marine twist rudder, the problem of ineffective utilization of propeller wake energy was solved, resulting in reduced energy loss and increased thrust.
Patent Information
- Application Number
- CN202511273199.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-08
- Publication Date
- 2025-11-18
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The wake energy of existing ship propellers is not effectively utilized, resulting in large energy loss, especially in high-speed ships where cavitation is prone to occur.
Design a marine torsion rudder with a segmented structure. The first, second, and third rudder blades are proportionally reduced in size. The position of the propeller and the second rudder blade are adjusted to avoid cavitation. Energy utilization efficiency is improved through reasonable rudder blade profile and guide edge design.
It effectively avoids cavitation, reduces energy loss, increases thrust, and improves the efficiency of the propeller rudder.
Smart Images
Figure CN120964017A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of shipbuilding, in particular to a marine twist rudder. BACKGROUND
[0002] The twist rudder belongs to a kind of high-efficiency reaction rudder, which makes full use of the wake of propeller to improve the cooperation of propeller and rudder. About 15%-30% of the total energy of ship propeller remains in the wake field in the form of kinetic energy, and the induced velocity generated by propeller at different rudder heights is different in size and direction. The design of twist rudder deflects the section profile of rudder at different heights by a certain angle according to the direction of incoming flow, so that each rudder section can obtain a more favorable incoming flow attack angle, thereby obtaining additional lift and additional resistance, and the resultant force is additional thrust.
[0003] Due to the rotation of propeller, opposite water flows are generated at the upper and lower parts of rudder blade, and the energy of this part of water flow is dissipated in water. Especially for high-speed ships, since the flow velocity is large, the water flow directly to the rudder blade will produce cavitation, resulting in large energy consumption.
[0004] Therefore, there is an urgent need for a marine twist rudder to solve the above technical problems. SUMMARY
[0005] The purpose of the present application is to provide a marine twist rudder which can avoid cavitation and reduce energy loss.
[0006] To achieve this purpose, the present application adopts the following technical solutions:
[0007] A marine twist rudder comprises a first rudder blade, a second rudder blade and a third rudder blade, the two ends of the second rudder blade are connected to the first rudder blade and the third rudder blade respectively, the first rudder blade is connected to a rudder post, the front end of the first rudder blade, the front end of the second rudder blade and the front end of the third rudder blade decrease in the same proportion from top to bottom, and the transition is smooth, the propeller comprises a propeller shaft and a fan blade, the propeller shaft is connected to the ship body, the fan blade is sleeved on the propeller shaft, the diameter of the fan blade is D, and the distance between the top of the second rudder blade and the propeller shaft is h, wherein 0.7D≤h≤1.1D.
[0008] As a preferred technical solution of the above-mentioned marine twist rudder, h=0.82D.
[0009] As a preferred technical solution of the above-mentioned marine twist rudder, the length of the top of the rudder post is L0, the length of the bottom of the rudder post is L1, the length of the bottom of the first rudder blade is L2, the length of the bottom of the second rudder blade is L3, and the length of the bottom of the third rudder blade is L4, wherein L4≤L3≤L2≤L1≤L0.
[0010] As a preferred technical scheme of the ship twist rudder, the upper part of the first rudder blade has a symmetric airfoil cross section.
[0011] As a preferred technical scheme of the ship twist rudder, the length of the rear end of the second rudder blade is Lr, and the length of the second rudder blade is La, wherein Lr≤0.65La.
[0012] As a preferred technical scheme of the ship twist rudder, the angle between the line connecting the rear end and the front end of the second rudder blade and the length direction of the ship body is a, wherein 2°≤a≤10°.
[0013] As a preferred technical scheme of the ship twist rudder, the angle between the line connecting the rear end and the front end of the second rudder blade and the length direction of the ship body is a, wherein a=4.6.
[0014] As a preferred technical scheme of the ship twist rudder, the ship twist rudder further comprises a rudder ball, which is installed at the connection between the second rudder blade and the third rudder blade, and the rudder ball is opposite to the center of the propeller shaft.
[0015] As a preferred technical scheme of the ship twist rudder, the bottom front end of the third rudder blade is provided with a guide edge.
[0016] As a preferred technical scheme of the ship twist rudder, the guide edge is arc-shaped.
[0017] The present application has the following beneficial effects:
[0018] The present application provides a ship twist rudder. The ship twist rudder comprises a first rudder blade, a second rudder blade and a third rudder blade, the two ends of the second rudder blade are connected to the first rudder blade and the third rudder blade respectively, the first rudder blade is connected to a rudder post, the front end of the first rudder blade, the front end of the second rudder blade and the front end of the third rudder blade decrease in the same proportion from top to bottom, and the transition is smooth, the propeller comprises a propeller shaft and a fan blade, the propeller shaft is connected to a ship body, the fan blade is sleeved on the propeller shaft, the diameter of the fan blade is D, and the distance between the top of the second rudder blade and the propeller shaft is h, wherein 0.7D≤h≤1.1D. The ship twist rudder adopts a segmented structure, and the front ends of the whole rudder blades are smoothly connected. By adjusting the relative position of the propeller and the second rudder blade, cavitation can be avoided, energy loss can be reduced, and the propulsive force can be improved. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the contents of the embodiments of the present application and the drawings.
[0020] Figure 1 is a first structural schematic diagram of a marine twisted rudder provided by the embodiments of the present application;
[0021] Figure 2 is a second structural schematic diagram of a marine twisted rudder provided by the embodiments of the present application;
[0022] Figure 3 is a third structural schematic diagram of a marine twisted rudder provided by the embodiments of the present application;
[0023] Figure 4 is a fourth structural schematic diagram of a marine twisted rudder provided by the embodiments of the present application;
[0024] Figure 5 is a structural schematic diagram of a guide edge provided by the embodiments of the present application;
[0025] Figure 6 is a structural schematic diagram of a second rudder blade provided by the embodiments of the present application.
[0026] In the drawings:
[0027] 1, first rudder blade; 2, second rudder blade; 3, third rudder blade; 4, deadwood; 5, propeller; 51, propeller shaft; 52, fan blade; 6, ship body; 7, rudder bulb; 8, guide edge. DETAILED DESCRIPTION
[0028] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.
[0029] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0030] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.
[0031] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and other orientation or position relationships shown in the drawings are based on the orientation or position relationships shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0032] As shown in Figures 1 to 6 The present application provides a ship twist rudder. The ship twist rudder comprises a first rudder blade 1, a second rudder blade 2 and a third rudder blade 3.
[0033] Specifically, the two ends of the second rudder blade 2 are connected to the first rudder blade 1 and the third rudder blade 3 respectively, the first rudder blade 1 is connected to a stock 4, the front end of the first rudder blade 1, the front end of the second rudder blade 2 and the front end of the third rudder blade 3 decrease in the same proportion from top to bottom, and the transition is smooth, the propeller 5 comprises a propeller shaft 51 and a fan blade 52, the propeller shaft 51 is connected to a ship body 6, the fan blade 52 is sleeved on the propeller shaft 51, the diameter of the fan blade 52 is D, and the distance between the top of the second rudder blade 2 and the propeller shaft 51 is h, wherein 0.7D≤h≤1.1D. The ship twist rudder adopts a segmented structure, and the front ends of the entire rudder blades are smoothly transitioned. By adjusting the relative position of the propeller 5 and the second rudder blade 2, cavitation can be avoided, energy loss can be reduced, and the propulsive force can be improved.
[0034] Optionally, in the present embodiment, h=0.82D, the height of the first rudder blade 1 is H1, the height of the second rudder blade 2 is H2, the height of the third rudder blade 3 is H3, H1≤H2≤H3, and the height of the propeller shaft 51 is greater than the height of the third rudder blade 3, i.e. the bottom of the third rudder blade 3 is higher than the bottom of the propeller shaft 51, which can avoid the third rudder blade 3 from touching the water bottom when the ship sits on the bottom. Of course, in other embodiments, the value of h is determined according to different ships and propellers 5, which will not be described here.
[0035] Optionally, in the embodiment, the length of the top of the wooden block 4 is L0, the length of the bottom of the wooden block 4 is L1, the length of the bottom of the first rudder blade 1 is L2, the length of the bottom of the second rudder blade 2 is L3, and the length of the bottom of the third rudder blade 3 is L4, wherein L4≤L3≤L2≤L1≤L0. Specifically, the lengths of the first rudder blade 1, the second rudder blade 2, and the third rudder blade 3 gradually decrease from top to bottom, and the line connecting the front ends of the first rudder blade 1, the second rudder blade 2, and the third rudder blade 3 assumes an inclined form toward the bow of the ship, and the rear ends of the first rudder blade 1, the second rudder blade 2, and the third rudder blade 3 assume an upright form from top to bottom, and the thicknesses are also reduced in the same proportion, so that appropriate attack angles can be adopted in different height regions, the attack angle of the twisted rudder and the water flow is reduced, cavitation is reduced, appropriate airfoils are adopted to improve thrust, tail flow energy is recycled, and the efficiency of the ship propeller rudder is improved. Of course, in other embodiments, the front ends of the first rudder blade 1, the second rudder blade 2, and the third rudder blade 3 assume an upright form from top to bottom.
[0036] Optionally, the upper part of the first rudder blade 1 has a symmetric airfoil cross section, and the bottom of the wooden block 4 has a symmetric airfoil cross section, so that the first rudder blade 1 and the wooden block 4 are smoothly connected, and cavitation can be reduced. Further, in order to reduce the attack angle of the water flow and the twisted rudder, taking the right-turning propeller 5 as an example, that is, the propeller 5 rotates clockwise, the uppermost part of the first rudder blade 1 gradually transitions to the left side, the first rudder blade 1 transitions from the top symmetric cross section to the left-inclined airfoil cross section downward, and the maximum inclination angle is at the center of the propeller shaft 51.
[0037] Optionally, the length of the rear end of the second rudder blade 2 is Lr, and the length of the second rudder blade 2 is La, wherein Lr≤0.65La. Specifically, taking the right-turning propeller 5 as an example, the rear end of the second rudder blade 2 remains symmetric, and the front end of the second rudder blade 2 is inclined to the left side of the ship body 6, so as to adapt to the water flow of the upper half circle of the propeller 5.
[0038] Optionally, the entire cross section of the third rudder blade 3 is divided into two parts, the tail end part remains symmetric, and the front end part is inclined to the right side of the ship, so as to adapt to the water flow of the lower half circle of the propeller 5.
[0039] Optionally, the angle between the line connecting the front end and the rear end of the second rudder blade 2 and the length direction of the ship body 6 is a, wherein 2°≤a≤10°, so as to reduce the attack angle of the second rudder blade 2 and the water flow, the overall attack angle of the second rudder blade 2 remains basically the same, the cross-sectional attack angle difference between the upper end surface and the lower end surface is less than 1°, on the one hand, the performance is improved, and on the other hand, the processing is facilitated. Further, in the embodiment, a=4.6°, of course, in other embodiments, the angle a is determined according to different ship bodies 6 and propellers 5, which will not be described here.
[0040] Optionally, the ship twist rudder further comprises a rudder ball 7, which is installed at the joint of the second rudder blade 2 and the third rudder blade 3 and is opposite to the center of the propeller shaft 51. Specifically, the rudder ball 7 is installed at the front end of the twist rudder, is opposite to the joint of the second rudder blade 2 and the third rudder blade 3 in the middle of the propeller shaft 51, has a front end surface in a plane form, is streamlined as a whole, and has a diameter gradually increasing from front to back and then decreasing, the maximum diameter of the rudder ball 7 is close to the maximum thickness of the twist rudder, and the smooth transition is ensured.
[0041] Optionally, the bottom front end of the third rudder blade 3 is provided with a guide edge 8. Specifically, the guide edge 8 is arranged at the bottom front end of the twist rudder to reduce the pressure gradient at the position and thus reduce the influence of cavitation. Further, the guide edge 8 is in an arc shape, and the arc transition can further reduce the pressure gradient.
[0042] Optionally, in the embodiment, the front edge guide edge 8 of the twist rudder is in a form of an inclined line from top to bottom, which can reduce the influence of cavitation. Of course, in some other embodiments, the front edge guide edge 8 of the twist rudder is in a form of a curved transition from top to bottom.
[0043] In addition, the above are only the preferred embodiments of the present application and the technical principles applied. It can be understood by those skilled in the art that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the appended claims.
Claims
1. A twisted rudder for a marine vessel, characterized in that, The marine twisted rudder comprises a first rudder blade (1), a second rudder blade (2) and a third rudder blade (3), two ends of the second rudder blade (2) are connected to the first rudder blade (1) and the third rudder blade (3) respectively, the first rudder blade (1) is connected to a rudder post (4), the front end of the first rudder blade (1), the front end of the second rudder blade (2) and the front end of the third rudder blade (3) are in the same proportion from top to bottom, and the transition is smooth, a propeller (5) comprises a propeller shaft (51) and a fan blade (52), the propeller shaft (51) is connected to a hull (6), the fan blade (52) is sleeved on the propeller shaft (51), the diameter of the fan blade (52) is D, the distance between the top of the second rudder blade (2) and the propeller shaft (51) is h, and 0.7D≤h≤1.1D. h=0.82D.
2. A twisted rudder according to claim 1, characterised in that The length of the top of the rudder post (4) is L0, the length of the bottom of the rudder post (4) is L1, the length of the bottom of the first rudder blade (1) is L2, the length of the bottom of the second rudder blade (2) is L3, and the length of the bottom of the third rudder blade (3) is L4, wherein L4≤L3≤L2≤L1≤L0.
3. A twisted rudder according to claim 1, wherein The upper part of the first rudder blade (1) is in a symmetrical airfoil shape.
4. A twisted rudder according to claim 1, wherein The length of the rear end of the second rudder blade (2) is Lr, and the length of the second rudder blade (2) is La, wherein Lr≤0.65La.
5. A twisted rudder according to claim 1, wherein The angle between the line connecting the rear end and the front end of the second rudder blade (2) and the length direction of the hull (6) is a, wherein 2°≤a≤10°.
6. A twisted rudder according to claim 5, characterised in that, The angle between the line connecting the rear end and the front end of the second rudder blade (2) and the length direction of the hull (6) is a, wherein a=4.6°.
7. A twisted rudder according to any one of claims 1-6, characterized in that The marine twisted rudder further comprises a rudder ball (7) installed at the connection between the second rudder blade (2) and the third rudder blade (3), and the rudder ball (7) is opposite to the center of the propeller shaft (51).
8. A twisted rudder according to any one of claims 1-6, characterized in that The bottom front end of the third rudder blade (3) is provided with a guide edge (8).
9. A twisted rudder according to any one of claims 1-6, characterized in that The guide edge (8) is in an arc shape.
10. A twisted rudder according to claim 9, characterised in that