The invention relates to a semi-spade rudder cavitation probability reducing device. The semi-spade rudder cavitation probability reducing device comprises at least two upper flow guiding devices fixed on upper part positions of a spade rudder arm and at least two lower flow guiding devices fixed on lower part positions of a rudder blade, wherein an upper rubber flow guiding piece of a luffing side board rotates to a certain angle around a fixing shaft under the effect of the rudder blade and is close to the rudder blade during luffing a semi-spade rudder, the upper rubber flow guiding piece on the other side is close to the rudder blade under the effect of incoming flow, the surfaces of the flow guiding pieces and the rudder blade are in smooth transition, so that turbulent flow and cavitation phenomena are avoided, and the upper rubber flow guiding pieces of a left board and a right board are automatically close to the rudder blade under the effect of the incoming flow when a rudder angle is recovered to 0 degree; upper spring devices and lower spring devices are arranged between shaft sleeves corresponding to the lower flow guiding devices and lining sleeves corresponding to the lower flow guiding devices, the upper spring devices are used for limiting the clockwise rotation of lower rubber flow guiding pieces, the lower spring devices are used for limiting the anticlockwise rotation of the lower rubber flow guiding pieces, and under the effects of the upper spring devices and the lower spring devices, the lower rubber flow guiding pieces invariably have trends of recovering to initial positions and are close to the spade rudder arm.
Semi-spade rudder cavitation probability reducing device
2015-08-26
Patent
Elektronische Ressource
Englisch
IPC: | B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING |
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