Device for improving the water influx towards a propeller of a watercraft
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B63H-001/28
B63H-005/16
F04D-029/40
출원번호
US-0889491
(2014-03-31)
등록번호
US-10005530
(2018-06-26)
우선권정보
DE-20 2013 101 943 U (2013-05-06)
국제출원번호
PCT/EP2014/056412
(2014-03-31)
국제공개번호
WO2014/180605
(2014-11-13)
발명자
/ 주소
Lehmann, Dirk
Mewis, Friedrich
출원인 / 주소
becker marine systems GmbH & Co. KG
대리인 / 주소
Kelly & Kelley, LLP
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
The invention relates to a device for reducing the driving power requirement of a watercraft, comprising a flow guiding surface from which at least one first fin projects. A first end of said first fin is fixed to the flow guiding surface, and a second end of the first fin is embodied as a free end.
The invention relates to a device for reducing the driving power requirement of a watercraft, comprising a flow guiding surface from which at least one first fin projects. A first end of said first fin is fixed to the flow guiding surface, and a second end of the first fin is embodied as a free end.
대표청구항▼
1. A device for improving water influx towards a propeller of a watercraft, the device comprising a flow-guiding surface, wherein a first fin or a plurality of first fins project from the flow-guiding surface, wherein a first end of the first fin is fastened to the flow-guiding surface and a second
1. A device for improving water influx towards a propeller of a watercraft, the device comprising a flow-guiding surface, wherein a first fin or a plurality of first fins project from the flow-guiding surface, wherein a first end of the first fin is fastened to the flow-guiding surface and a second end of the first fin is configured as a free end, and wherein a second fin or a plurality of second fins project from the flow-guiding surface, wherein a first end of the second fin is disposed on the flow-guiding surface, and the second fin is mounted with a second end on a hull and/or on a shaft bearing which is configured for mounting a propeller shaft of the propeller of the watercraft, a length of the first fin being at least one and a half times as great as a length of the second fin, wherein on a propeller upwards-beating side of the flow-guiding surface more of the first fins or the second fins are provided than on a propeller downwards-beating side of the flow-guiding surface, and wherein the first fins and/or the second fins can form an asymmetric first fin system or an asymmetric second fin system. 2. The device according to claim 1, wherein the flow-guiding surface is disposed upstream of the propeller, wherein the flow-guiding surface is disposed at a distance from the propeller, wherein the flow-guiding surface is disposed at a distance from a shaft bearing which is configured for mounting a propeller shaft of the propeller of the watercraft. 3. The device according to claim 1, wherein a distance between a propeller axis and the first end of the first fin is shorter than the distance between the propeller axis and the second end of the first fin and/or wherein the first fin has a greatest profile thickness, and wherein the greatest profile thickness of the first fin is less than 25% of the distance between the first end and the second end of the first fin. 4. The device according to claim 1, wherein the flow-guiding surface has a front-side profile inlet edge which is directed away from the propeller and that the flow-guiding surface has a front-side profile outlet edge which is directed towards the propeller, wherein a distance between a propeller axis and the profile inlet edge is smaller than or greater than the distance between the propeller axis and the profile outlet edge, and/or wherein a shortest distance between the flow-guiding surface and the propeller axis is less than half a propeller diameter. 5. The device according to claim 1, wherein the first fin and/or the second fin are disposed radially to a propeller axis of the propeller of the watercraft. 6. The device according to claim 5, wherein the first fin extends from the second fin, wherein the first and second fins together form a complete fin having a length. 7. The device according to claim 6, wherein the length of the complete fin is greater than or smaller than a radius of the propeller of the watercraft. 8. The device according to claim 6, wherein the complete fin is swept. 9. The device according to claim 6, wherein the length of the complete fin is smaller than a radius of the propeller of the watercraft, wherein the length of the complete fin is a maximum of 75% of the radius of the propeller. 10. The device according to claim 5, wherein the first fin and/or the second fin are arranged at an angle of attack to the propeller axis. 11. The device according to claim 5, wherein the first fin and/or the second fin are swept. 12. The device according to claim 1, including a fin end piece protruding from the free end of the first fin. 13. The device according to claim 12, wherein the fin end piece is disposed on the free end of the first fin at a radius or at an angle. 14. The device according to claim 12, wherein the fin end piece protrudes from a suction side of the first fin. 15. The device according to claim 1, wherein the flow-guiding surface has a length, and wherein a greatest profile thickness of the flow-guiding surface is less than 10% of the length of the flow-guiding surface. 16. The device according to claim 1, wherein between the flow-guiding surface and a propeller axis at least one stabilizing strut is provided for stabilizing the flow-guiding surface, wherein the stabilizing strut is fastened with one end on the flow-guiding surface and with another end on a shaft bearing, which is configured for mounting the propeller shaft of the propeller of the watercraft. 17. The device according to claim 16, wherein the stabilizing strut has a hydrofoil profile. 18. The device according to claim 1, wherein the flow-guiding surface is configured to be circumferentially open or closed, and/or wherein the flow-guiding surface is configured to be straight, and/or wherein the flow-guiding surface is configured to be convex with respect to a propeller axis, and/or wherein the flow-guiding surface is configured to be arcuate and circumferentially open, wherein an arc length of the flow-guiding surface when considering a cross-section of the flow-guiding surface is less than 80% of the circumference of a circumferentially closed flow-guiding surface. 19. The device according to claim 18, wherein the arc length of the flow-guiding surface when considering a cross-section of the flow-guiding surface is less than 40% of the circumference of the circumferentially closed flow-guiding surface. 20. The device according to claim 1, wherein the flow-guiding surface is configured as a nozzle. 21. The device according to claim 1, wherein a greatest profile thickness of the flow-guiding surface is less than 7.5% of a length of the flow-guiding surface. 22. The device according to claim 1, including a fore-nozzle, wherein a diameter of the fore-nozzle is less than 70% of the propeller of the watercraft. 23. The device according to claim 22, wherein the diameter of the fore-nozzle is less than 50% of the diameter of the propeller of the watercraft.
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이 특허에 인용된 특허 (5)
Mewis, Friedrich, Device for reducing the power demand for the propulsion of a ship.
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