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Propulsion device for multi-shaft ship

A technology of propulsion device and hull, applied in ship propulsion, propulsion components, rotary propellers, etc., can solve the problems of reducing hub vortex, hindering propulsion efficiency, unable to set bulb nose, fins, etc., to achieve the effect of improving propulsion efficiency

Active Publication Date: 2018-12-21
JAPAN MARINE UNITED CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in a multi-spindle ship with two or more shafts, there may be propellers that do not have a rudder at the rear, and such a propeller does not have an appropriate structure at the rear, so bulbs and fins cannot be installed as described above.
In this way, depending on the type of multi-spindle ship, there are propellers that cannot reduce the hub vortex with the addition, which becomes a factor that hinders the improvement of propulsion efficiency

Method used

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  • Propulsion device for multi-shaft ship
  • Propulsion device for multi-shaft ship
  • Propulsion device for multi-shaft ship

Examples

Experimental program
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Embodiment Construction

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0016] Figure 1~Figure 3 An example of the form of the propulsion device of the multi-shaft ship implemented by this invention is shown. In this embodiment, the case of applying the present invention to a three-axle ship is illustrated, such as figure 1 As shown, a multi-shaft ship (triaxial ship) 1 includes a total of three propellers, one propeller (center propeller) 3 provided at the center of the stern of a hull 2 ​​and one propeller (side propeller) 4 mounted on each of the left and right sides.

[0017] Such as figure 2 As shown, a rudder 5 is disposed behind the center propeller 3 , and a bulbous appendage 6 is provided on the rudder 5 at the height of the axis of the center propeller 3 . The appendage 6 has, for example, a circular cross-section in a direction perpendicular to the central axis extending in the direction of the hull, and its rear portion has...

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Abstract

An appendage 8 for reducing hub vortex is disposed, via a support body 7 extending from a hull 2, at the rear of a propeller (wing propeller) 4 which has no rudder disposed to the rearward thereof. The appendage 8 has a circular cross-section in a direction orthogonal to a center axis extending in the hull direction, and a rear section thereof is formed in a spindle shape, the diameter of which decreases toward the rear end thereof. The appendage 8 is configured to have a maximum diameter that is equal to 10-40% of the diameter of the propeller (wing propeller) 4, and a hull-direction length that is equal to 40-70% of the diameter of the propeller (wing propeller) 4.

Description

technical field [0001] The present invention relates to propulsion devices for multi-shaft ships. Background technique [0002] Conventionally, as a propulsion device for a ship using a propeller, it is known that a rudder behind the propeller is provided with an appendage for the purpose of reducing the hub vortex generated with the rotation of the propeller to improve propulsion efficiency. For example, Patent Document 1 below describes a propulsion performance improving device for a ship provided with a bulbous nose and a pair of left and right fins at positions on the propeller axis at the leading edge of a rudder disposed behind the propeller. In addition, Patent Document 2 described below describes a twin-shaft twin-rudder twin-skeg boat in which the rudders behind the respective propellers on the starboard and starboard sides each have bulbous noses and fins. [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 11-139395. [0004] Patent Document 2:...

Claims

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Application Information

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IPC IPC(8): B63H5/07B63H1/28B63H5/08
CPCB63H1/28B63H5/08
Inventor 增田圣始藤泽竹春山内丰
Owner JAPAN MARINE UNITED CORP