Title:
マリーンウォータージェット推進装置のインペラ
Document Type and Number:
Japanese Patent JP4636668
Kind Code:
B2
Abstract:
An impeller (22) for a marine waterjet propulsion system has blades (44) that are configured to reduce cavitation, vibration, noise and physical damage to the major components of the propulsion system or host vessel of installation. The leading edge (52) of each blade of the impeller is skewed forwardly over at least the outer 70% of its span, the forward skew being maximum at the tip (56) and being not less than 35° and preferably not less than 50°. The impeller has a blade area ratio of not less than 1.5. The chord lengths of each blade increase progressively from the point of minimum skew to the tip, resulting in reduced loading in the cavitation critical region. A partial or full tip band may be affixed to the blade tips.
Inventors:
Francesco Rani
Neil A Brown
Neil A Brown
Application Number:
JP2000323000A
Publication Date:
February 23, 2011
Filing Date:
October 23, 2000
Export Citation:
Assignee:
Bird Johnson Company
International Classes:
B63H11/103; B63H1/18; B63H11/08; F04D29/18; F04D29/22; F04D29/24; F04D29/66
Domestic Patent References:
| JP9099895A | ||||
| JP5085480A | ||||
| JP51004792A | ||||
| JP60004490A | ||||
| JP11247788A |
Foreign References:
| US5226804 |
Attorney, Agent or Firm:
Minoru Nakamura
Fumiaki Otsuka
Sadao Kumakura
Shishido Kaichi
Hideto Takeuchi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo
Takaki Nishijima
Atsushi Hakoda
Fumiaki Otsuka
Sadao Kumakura
Shishido Kaichi
Hideto Takeuchi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo
Takaki Nishijima
Atsushi Hakoda