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Marine vessel with a large propeller and gearbox

A propeller, gearbox technology, applied in the field of ships with large propellers and gearboxes, which can solve the problems of design not proved to be competitive, increased resistance, etc.

Inactive Publication Date: 2017-03-22
ODENSE MARITIME TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Larger propellers can be submerged by applying special shapes of the stern body (i.e., the concave hull portion above the propeller), such as semi-ducts, but the resulting increase in flooded surface has so far resulted in a size corresponding to the increase in propeller efficiency The resistance increases
Several ships of this type have been built, but the design has not yet proven competitive

Method used

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  • Marine vessel with a large propeller and gearbox
  • Marine vessel with a large propeller and gearbox
  • Marine vessel with a large propeller and gearbox

Examples

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Embodiment Construction

[0029] In the following detailed description, a vessel will be described by way of exemplary embodiments. figure 1 , figure 2 and image 3 The stern of the ship is schematically shown. Ship 1 includes hull 2 ​​and superstructure 3 (such as Figure 10 shown). In one embodiment, the ship 1 is a cargo ship. The vessel 1 is designed with a predetermined draft selected such that the draft of the vessel 1 does not exceed the water depth of the port of call. This draft is determined as the depth of the base line 20 of the hull 2 ​​when the vessel 1 is fully laden. The baseline extends roughly between the bow and the stern of the hull 2 ​​. Also shown is the waterline 15 of the vessel 1 in a ballasted state.

[0030] Internal combustion engine 10 is located inside hull 2 ​​. In one embodiment, the internal combustion engine 10 is a large, low-speed operating two-stroke auto-ignition internal combustion engine. The large two-stroke internal combustion engine 10 is provided wi...

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Abstract

A marine vessel (1) driven by an engine (10, 50) with a very large first propeller (11) and a less large coaxial contra rotating second propeller (12). The marine vessel (1) comprises a hull (2) with a baseline (20) extending between the bow and the aft, an engine (10, 50) arranged inside the hull (2), a pair of coaxial contra-rotating propellers (11, 12) mounted in tandem on concentric shafts (32, 34) at or near the aft of the hull (2) and operably connected to the engine (10). The pair of coaxial contra-rotating propellers (11, 12) comprises a first propeller (11) with a first radius (R1) and a second propeller (12) with a second radius (R2) that is smaller than the first radius (R1). The axis (9) of the concentric shafts (32, 34) has a vertical distance (V) from the base line (20) that is at least equal to the second radius (R2) and smaller than the first radius (R1). Said first propeller (11) being arranged to be kept stationary in a specific angular position whilst the second propeller (12) is rotatable by the large internal combustion engine (10, 50).

Description

technical field [0001] The present invention relates to a ship with a large propeller, in particular to a ship with a large propeller and a coaxial counter-rotating propeller (CCP). Background technique [0002] The fuel cost of a ship, especially a cargo ship, is one of the main costs in its economy, so fuel consumption is one of the most important aspects of cargo ship design. The current trend towards deceleration (slow steaming) means that there is very little potential for major improvements in hull shape, since the vast majority of a ship's resistance depends primarily on the ship's flooded surface area. The only components in a ship's propulsion system with significant losses (ie potential for savings) are the main engines and propellers. This makes propeller efficiency a major area of ​​interest for ship designers who are not involved in engine design. In order to minimize the kinetic energy loss in the propeller wake, the mass flow through the propeller disc must ...

Claims

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Application Information

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IPC IPC(8): B63H5/10B63H23/06
CPCB63H5/10B63H23/06B63H2023/067
Inventor S·施耐克P·T·斯科勒
Owner ODENSE MARITIME TECH
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