Propulsion device for proximity twin-screw vessel having shaft bracket and ship

a technology of proximity twinscrew and propeller, which is applied in the direction of marine propulsion, vessel construction, hull parts, etc., can solve the problems of poor influence on propeller durability, and excessive water bubble generation, so as to suppress cavitation and improve the effect of propulsion performan

Inactive Publication Date: 2016-11-10
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The propulsion device for the twin-screw vessel in this patent improves performance while reducing problems like cavitation and erosion.

Problems solved by technology

Accordingly, since a circumferential speed of the propeller is increased, a pressure in the vicinity of a propeller blade end is lowered, and cavitation that is a phenomenon in which bubbles are generated in water may excessively occur.
In addition, erosion occurs in the propeller due to the cavitation and exerts a bad influence on durability of the propeller.

Method used

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  • Propulsion device for proximity twin-screw vessel having shaft bracket and ship
  • Propulsion device for proximity twin-screw vessel having shaft bracket and ship
  • Propulsion device for proximity twin-screw vessel having shaft bracket and ship

Examples

Experimental program
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first embodiment

[0037]FIG. 1 is a bottom view showing a configuration of a propulsion device for a proximity twin-screw vessel having a shaft bracket of a first embodiment. FIG. 2 is a side view showing the configuration of the propulsion device.

[0038]Here, a twin-screw vessel (a ship, a proximity twin-screw vessel) 1 having a stern structure of a single screw vessel type that is a kind of multi-screw vessel is exemplarily described as a ship.

[0039]As shown in FIG. 1, a propulsion device of the twin-screw vessel 1 of the embodiment includes a starboard propeller 10R, a port propeller 10L and a rudder 40.

[0040]The starboard propeller 10R is installed under a starboard side of the bottom 4 of the stern hull 3 of the ship, that is, the stern of the hull. The starboard propeller 10R is connected to one end of a starboard propeller shaft 12R. A starboard main engine 18R is installed at a starboard side in the stern hull 3. The starboard propeller shaft 12R passes through the stern hull 3 via a bossing 1...

second embodiment

[0063]Next, a second embodiment of the propulsion device for the proximity twin-screw vessel having the shaft bracket and the ship according to the present invention will be described. Since the second embodiment to be described below is different from the first embodiment only in the configurations of the shaft brackets 13R and 13L, the same components as the first embodiment are designated by the same reference numerals, and overlapping description thereof will be omitted.

[0064]FIG. 5 is a bottom view showing a configuration of the propulsion device of the proximity twin-screw vessel having the shaft bracket of the second embodiment of the present invention. FIG. 6 is an enlarged view of a major part of FIG. 5, showing a cross-sectional shape of a strut of a shaft bracket. FIG. 7 is a view of the propulsion device of the proximity twin-screw vessel having the shaft bracket of the second embodiment of the present invention when seen from a rear side.

[0065]As shown in FIGS. 5, 6 and...

third embodiment

[0071]Next, a third embodiment of the propulsion device for the proximity twin-screw vessel having the shaft bracket and the ship according to the present invention will be described. Since the third embodiment to be described below is different from the second embodiment only in the configurations of the shaft brackets 13R and 13L, the same components as the second embodiment are designated by the same reference numerals, and overlapping description thereof will be omitted.

[0072]FIG. 8 is a view of the propulsion device of the proximity twin-screw vessel having the shaft bracket of the third embodiment of the present invention, when seen from a rear side.

[0073]As shown in FIG. 8, the twin-screw vessel 1 according to the embodiment includes the starboard propeller 10R, the port propeller 10L and the rudder 40 provided with the same configuration as in the second embodiment.

[0074]The starboard propeller shaft 12R and the port propeller shaft 12L are rotatably supported by the shaft b...

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Abstract

A propulsion device for a ship includes a port propeller and a starboard propeller, a rudder disposed at a center in a vessel widthwise direction, and shaft brackets installed in front of the port propeller and the starboard propeller, respectively, and configured to rotatably support propeller shafts of the port propeller and the starboard propeller, wherein a distance between a front end of a propeller blade of the port propeller and a front end of a propeller blade of the starboard propeller at the center in the vessel widthwise direction is larger than 0 m and equal to or less than 1.0 m, and a rotational direction of the port propeller and the starboard propeller becomes an outer track rotating outward from the center in the vessel widthwise direction over the port propeller and the starboard propeller.

Description

TECHNICAL FIELD[0001]The present invention relates to a propulsion device for a proximity twin-screw vessel having a shaft bracket, and a ship.[0002]Priority is claimed on Japanese Patent Application 2014-233258, filed Nov. 18, 2014, the content of which is incorporated herein by reference.BACKGROUND ART[0003]A propulsion device of a ship generally obtains a propulsive force by rotating a propeller using a main engine.[0004]In the case of a ship known as a single screw vessel including one main engine and one propeller, when the ship is increased in size, a load level applied to the one propeller is increased. In order to obtain a sufficient propulsive force, a rotational speed of the propeller should be increased or a diameter of the propeller should be increased. Accordingly, since a circumferential speed of the propeller is increased, a pressure in the vicinity of a propeller blade end is lowered, and cavitation that is a phenomenon in which bubbles are generated in water may exc...

Claims

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Application Information

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IPC IPC(8): B63H5/08B63H25/38B63B3/42
CPCB63H5/08B63H25/38B63B3/42B63H5/16Y02T70/10
InventorMATSUMOTO, DAISUKE
OwnerMITSUBISHI HEAVY IND LTD