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hat rudder and boat

A cap plate and rudder shaft technology, which is applied in the direction of rudder steering and steering, can solve the problems of large rudder resistance, high material requirements, and large size, and achieve the effects of increasing speed, huge economic benefits, and reducing strength requirements

Active Publication Date: 2019-10-01
ZHUHAI SUNLOONG SHIPYARD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above two rudders have a common problem, that is, the torque and bending moment of the rudder shaft are relatively large, because the cantilever of the rudder shaft is long, the use of the bottom support seat of the rudder shaft can improve the situation of the bending moment, but the torsion still cannot Improvement, so the rudder shaft is designed with high strength requirements, relatively large size and relatively high material requirements
In addition, the resistance areas of the above two rudders are relatively large. Therefore, under the same rudder effect, the rudder resistance is still relatively large when sailing straight. In addition, the rudder effect of the blade rudder is not ideal.

Method used

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  • hat rudder and boat
  • hat rudder and boat

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0042] see image 3 The cap rudder of this example is only made of cap plate 31 and rudder shaft 32, and cap plate 31 has top surface 311, bottom surface 312, front end surface 313, rear end surface 314, left end surface 315 and right end surface 316. It can be understood that each end surface referred to in the present invention can be a plane or an arc surface, and should be selected comprehensively considering the fluid resistance and the simplification of the process. In this example, the bottom surface 312 is a cylindrical surface formed by a section of circular arc stretched longitudinally. The radius of the cylindrical surface circle is equal to the radius of the paddle that the hat rudder is adapted to plus a value of h, and the value of h can range from 0.1%d to The value between 100%d, where d is the diameter of the propeller, and the main considerations for the value of h are ship type and design speed, which can be determined through model experiments during implem...

no. 2 example

[0044] see Figure 4 The difference between this example and the first embodiment of the hat rudder is that the rib 33 is added, and the rib 33 is composed of a first rib 331 and a second rib 332 . The first rib plate 331 is vertically installed on the top surface 311, and one end thereof is connected to the rudder shaft 31, and the other end extends to the front end surface 313; the second rib plate 332 is vertically installed on the top surface 311, and one end thereof is connected to the rudder shaft 31 , and the other end extends to the rear end surface 314 . On the one hand, the ribs 33 can provide the effective area of ​​the rudder plate, and on the other hand, can provide the strength for fixing the hat plate 31 .

[0045] see Figure 5 In this example, when steering, the rudder area that can produce the rudder effect is equal to twice the longitudinal projected area of ​​the hat plate 31 plus the area of ​​the first rib 331 and the second rib 332 .

no. 3 example

[0047] It can be understood that, according to the present invention, the curvature of the cap plate in the transverse direction can be zero, see Figure 6 and Figure 7, the feature of the hat rudder in this example is that the vertical and horizontal curvature of the hat plate 31 is zero, and it is a flat plate. In this example, when the rudder is steered, the rudder area that can produce rudder effect is the first rib 331 and the second rib 332, and The rudder effect produced by the cap plate 31 can be ignored. The main function of the cap plate 31 is rectification, that is, in the longitudinal view, the water flow in front of and behind the propeller is regularized by the cap plate 31 to improve the propulsion efficiency. The other function is the same as the previous two examples Similarly, the anti-rolling moment is provided when the ship rolls longitudinally.

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Abstract

A hat rudder 3 for ships and a ship constructed with the hat rudder. The hat rudder comprises a rudder shaft 32 and a rudder body. The rudder body comprises a hat plate 31 fixed on the end portion of the rudder shaft. The hat plate is a space curved panel with a top surface 311, a bottom surface 312, a front end face 313, a rear end face 314, a left end face 315, and a right end face 316. The projected area of the hat plate on the cross section is smaller than the projected area on the waterline surface and also smaller than the projected area on the longitudinal section. The ship adopts a hat rudder.

Description

technical field [0001] The invention relates to a marine rudder with improved profile and structural design and a ship constructed by using the rudder, in particular to a hat rudder and a ship. Background technique [0002] The change of the course of the ship mainly depends on the steering. Commonly used rudders include blade rudders and diversion tube rudders. The commonality of the two structures is that they have a rudder shaft and a rudder body. The upper end of the rudder shaft is connected to the steering gear to receive the torque transmitted by the steering gear, and the lower end is connected to the rudder body. The structural feature of the blade rudder is that the rudder body is roughly flat when viewed from the side of the ship, in order to reduce the resistance generated by the rudder blade itself , There are also those who design the cross section of the rudder blade as NACA (National Advisory Committee for Aeronautics) airfoil symmetry. The structural featur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63H25/38
CPCB63H25/38
Inventor 梁明森
Owner ZHUHAI SUNLOONG SHIPYARD CO LTD
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