Marine propulsion – Jet drive – Direction control for fluid jet
Patent
1996-12-12
1998-02-03
Basinger, Sherman
Marine propulsion
Jet drive
Direction control for fluid jet
440 42, B63H 1111, B63H 11113
Patent
active
057137706
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a water-jet propulsion unit for a waterborne craft comprising a propeller pump having a pump housing which has an inlet opening and an outlet opening, and where at the outlet opening of the pump housing there is provided a steering nozzle having a fore and aft end, and which for directing the water jet is mounted at its fore end to be swung laterally about a vertical axis, and for the purpose of reversing the thrust direction of the unit a bucket is provided on the underside of the steering nozzle which can be swung about a horizontal axis between a position lying outside the water jet to an active position in the water jet.
U.S. Pat. No. 4,474,561 makes known a water-jet propulsion unit of the said type, where connected to the outlet opening of the pump housing is a support in which a steering nozzle for directing the water jet is mounted. This steering nozzle can be swung laterally about a vertical axis. For the purpose of reversing the thrust direction of the unit in order to retard or reverse the vessel, there is also a bucket which can be swung about a horizontal axis between a position lying completely outside the steering nozzle and an active position swung inwardly in the steering nozzle.
One object of the present invention is to provide a water-jet propulsion unit where one can, with greater precision and maintenance of greatest possible reversing thrust, control the driving thrust fore and aft, or hold the vessel still.
According to the invention, a water-jet propulsion unit for a waterborne craft is therefore proposed comprising a propeller pump having a pump housing which has an inlet opening and an outlet opening, and where at the outlet opening of the pump housing there is provided a steering nozzle having a fore and aft end, and which for directing the water jet is mounted at its fore end to be swung laterally about a vertical axis, and for the purpose of reversing the thrust direction of the unit, a bucket is provided on the underside of the steering nozzle which can be swung about a horizontal axis between a position lying outside the water jet and an active position in the water jet. Said water-jet propulsion unit is characterised in that the steering nozzle is substantially rectangular in nozzle cross-section and at its aft end is mounted pivotally about a horizontal axis between two side plates in a support, which is pivotally mounted about a vertical axis at the outlet opening for lateral swinging, and in that the bucket is pivotally mounted about a horizontal axis between the two side plates and is drive-connected to the steering nozzle so that when the fore end of the steering nozzle is swung upward it will swing from a position up under the steering nozzle to a downwardly swung position.
The drive connection between the steering nozzle and the bucket may to advantage be a link connection.
When travelling forward, the waterborne craft is steered in that the support and hence the steering nozzle is swung in the horizontal plane so that the steering nozzle deflects the water jet.
Retarding the vessel when it is in motion, or reversing it, is achieved by establishing a flow passage which deflects the water jet downward and forward beneath the bottom of the vessel. This takes place in that the leading edge of the steering nozzle is swung upward, and via the drive connection causes the bucket to swing downward.
The lower horizontal edge of the steering nozzle, when the steering nozzle is swung up, will gradually cut into the water jet from the outlet opening of the pump housing and cause an increasing amount of water to be deflected in a forward direction. The reversing thrust arises as a result of the water pressure against the bucket.
The vessel is steered in the same way during propulsion astern as during forward propulsion in that the support and hence the steering nozzle and the bucket are swung in the horizontal plane.
Advantageously, the support, in front of the steering nozzle, may have a substantially rectangular opening corresponding to the rectangular c
REFERENCES:
patent: 3461831 (1969-08-01), Lewis
patent: 4231315 (1980-11-01), Tachibana et al.
patent: 4538997 (1985-09-01), Haglund
Basinger Sherman
Kvaerner ASA
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