PROBLEM TO BE SOLVED: To provide a duct device for a ship, capable of improving propulsion efficiency of a propeller, while suppressing a risk of generation of cavitation.SOLUTION: The center axis 16 of a duct outer shell 11 is set at a position lower than the rotation axis 15 of a propeller 5, and the radius of the rear end 11b of the duct outer shell is set at a prescribed value. In this way, it is so configured that the rear end 11b of the duct outer shell is disposed at a position lower than the apex 20a of a propeller rotation surface 20 when the shape of the rear end 11b of the duct outer shell is projected on the propeller rotation surface 20, and a distance Lbetween the rear end 11b of the duct outer shell and the center Oof the propeller rotation surface becomes gradually larger as advancing in a direction expanding left and right along the circumference of the propeller rotation surface 20, based on the apex point 20b of the propeller rotation surface 20 as a reference.SELECTED DRAWING: Figure 1

    【課題】キャビテーション発生リスクを抑えつつ、プロペラ推進効率を向上させることができる船舶のダクト装置を提供する。【解決手段】ダクト外殻11の中心軸線16をプロペラ5の回転軸線15よりも下方位置に設け、ダクト外殻後端11bの半径を所定値に設定することで、ダクト外殻後端11bの形状をプロペラ回転面20上に投影したときに、プロペラ回転面20の頂部20aよりも低い位置にダクト外殻後端11bが配され、かつプロペラ回転面20の頂点20bを基準にそのプロペラ回転面20の円周に沿って左右に広がる方向に進むに従ってダクト外殻後端11bとプロペラ回転面中心OPとの距離LAが次第に大きくなるようにする。【選択図】図1


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    Titel :

    DUCT DEVICE FOR SHIP


    Weitere Titelangaben:

    船舶のダクト装置


    Beteiligte:
    ARAI DAISUKE (Autor:in) / AKIYAMA YU (Autor:in) / FURUIKE KENTA (Autor:in) / YOSHIDA RYU (Autor:in) / MIKO SHOTA (Autor:in)

    Erscheinungsdatum :

    2018-03-22


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS



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