Title:
【発明の名称】スクープ排水装置
Document Type and Number:
Japanese Patent JP3345830
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve drainage efficiency from a scoop drainage opening and reduce propulsion resistance of a hull by standingly providing a wall-shaped lip at the front edge and the rear edge of a scoop drainage opening, or in their periphery. SOLUTION: A scoop drainage opening 2 is formed on the surface of a hull1 such as the bottom or a side of a ship, substantially semi-cylindrical wall-shaped front edge lip 3 and rear edge lip 4 are respectively standingly provided at the front edge and the rear edge of the opening. When this drainage system has such front edge and rear edge lips 3, 4 or a lip formed by integrating them, water flow following propulsion of the hull, when passes through the front edge lip 3 and the rear edge lip 4, generates negative pressure regions respectively after the front edge lip 3 and before the rear edge lip 4. In other words, negative pressure regions are generated at two places between the front edge lip 3 and the rear edge lip 4, and negative pressure is provided in a wide region of the opening of the scoop drainage opening 2. Thus, since the negative pressure regions are generated at two places, lip height can be reduced.
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Inventors:
Seiji Masuda
Yoshikazu Kasahara
Yoshikazu Kasahara
Application Number:
JP27427298A
Publication Date:
November 18, 2002
Filing Date:
September 11, 1998
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
B63B1/32; B63B13/00; B63H21/38; B63J2/12; (IPC1-7): B63B13/00; B63H21/38
Domestic Patent References:
| JP681893U | ||||
| JP6223190U | ||||
| JP4410181B1 |
Attorney, Agent or Firm:
Toru Fujioka