Title:
【発明の名称】水噴射式推進船のインペラ構造
Document Type and Number:
Japanese Patent JP3058358
Kind Code:
B2
Abstract:
A water jet propelled boat is equipped with a water intake opening, a water jet outlet, and with a mixed flow type impeller, where the above mentioned water intake opening and the above mentioned water jet outlet are connected by a water passage with the impeller in the middle of the water passage, and where the operation of the impeller causes water to be drawn into the water intake opening and expelled through the above mentioned water outlet to propel the boat. The impeller structure is such that a boss section of the impeller has a plurality fins affixed to it, the outside edges of the above mentioned spiral fins are roughly parallel to the axial center of the above mentioned boss, and, the leading and the trailing edges of the fins, with respect to the axial center of the above described boss, slant down toward the above mentioned water outlet opening. At the same time relative speeds, the invention allows a smaller diameter fin unit and, at speeds of 4,000 rpm and over, it offers improved efficiency.
Inventors:
Hiroshi Tasaki
Yasuhiko Hemmi
Yasuhiko Hemmi
Application Number:
JP14403091A
Publication Date:
July 04, 2000
Filing Date:
May 20, 1991
Export Citation:
Assignee:
Sanshin Industry Co., Ltd.
International Classes:
B63H11/08; B63H11/117; (IPC1-7): B63H11/117; B63H11/08
Domestic Patent References:
| JP2147495A | ||||
| JP6060397U | ||||
| JP6365598U | ||||
| JP54136296U |
Attorney, Agent or Firm:
Yuji Nozue