JPS6238800U

JPS6238800U -

Info

Publication number: JPS6238800U
Application number: JP13239085U
Authority: JP
Priority date: 1985-08-28
Filing date: 1985-08-28
Publication date: 1987-03-07
Also published as: JPH0450238Y2

Description

[Brief explanation of the drawing]

図面のうち第１図〜第７図は本考案の実施例を
示すもので、第１図は船舶のプロペラ周辺の構造
を示す部分斜視図、第２図は要部側面図、第３図
は第２図―線断面図、第４図は第３図―
線断面図、第５図は第３図―線断面図、第６
図はプロペラへ流入する水流の流速分布を示す図
、第７図はコントラフイン付き上部ダクトを設け
た場合と設けない場合についての制動馬力と船速
との関係を示す線図、第８図は従来の略円筒状の
ダクトの底部の長さと所要推進馬力との関係を示
す線図、第９図はコントラフイン付き上部ダクト
を設けない場合の第６図相当図である。１……プロペラ、Ｃ……プロペラ軸軸心、２…
…上部ダクト、３ａ，３ｂ……コントラフイン、
４……船尾ボス部、５……スターンフレーム。 Among the drawings, Figs. 1 to 7 show an embodiment of the present invention, in which Fig. 1 is a partial perspective view showing the structure around the propeller of a ship, Fig. 2 is a side view of the main part, and Fig. 3 is a partial perspective view showing the structure around the propeller of a ship. Figure 2 - Line sectional view, Figure 4 is Figure 3 -
Line sectional view, Figure 5 is Figure 3 - Line sectional view, Figure 6
The figure shows the flow velocity distribution of water flowing into the propeller, Figure 7 is a diagram showing the relationship between braking horsepower and ship speed with and without an upper duct with contrafin installed, and Figure 8 is a diagram showing the relationship between braking horsepower and ship speed. FIG. 9, a diagram showing the relationship between the length of the bottom of a conventional substantially cylindrical duct and the required propulsion horsepower, is a diagram corresponding to FIG. 6 when the upper duct with a contrafin is not provided. 1...Propeller, C...Propeller shaft center, 2...
...Upper duct, 3a, 3b...Contrafin,
4... Stern boss section, 5... Stern frame.

Claims

[Scope of utility model registration request]

An upper duct is provided in front of the ship's propeller and above the horizontal plane containing the propeller shaft center, and is arc-shaped when viewed from the front from the propeller shaft direction and has an airfoil-shaped cross section in a plane containing the propeller shaft center. The front part of the top of the upper duct is fixed to the stern frame, and both left and right ends of the upper duct are fixed to the stern boss part through contra fins, and each of the contra fins directs the water flow into the propeller in the direction of propeller rotation. An upper duct with a contrafin for a ship, characterized in that it is formed with an airfoil cross section that points in opposite directions.