Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
  • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
  • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
  • B63H25/42—Steering or dynamic anchoring by propulsive elements; Steering or dynamic anchoring by propellers used therefor only; Steering or dynamic anchoring by rudders carrying propellers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
  • B63H25/42—Steering or dynamic anchoring by propulsive elements; Steering or dynamic anchoring by propellers used therefor only; Steering or dynamic anchoring by rudders carrying propellers
  • B63H2025/425—Propulsive elements, other than jets, substantially used for steering or dynamic anchoring only, with means for retracting, or otherwise moving to a rest position outside the water flow around the hull
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
  • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
  • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose

Definitions

• Steering and/or propulsion device for a vessel Steering and/or propulsion device for a vessel.
• the present invention relates to a steering and/or propulsion device for a vessel, preferably for installation in the bow portion of the vessel, comprising a propeller nozzle assembly adapted to be rotated 360° about its vertical axis.
• Drive power to the propeller and rotational force to the assembly are supplied from devices inside the vessel.
• the propeller may be of a fixed type or it may be a variable pitch propeller.
• Propeller/nozzle assemblies of this type are for instance disclosed in the Norwegian patent publication 136038. Such assemblies are commonly called “thrusters”.
• US 3517633 shows crossing channels in a hull, one channel i the longitudinal direction and one channel in the transverse direction.
• a propeller which does not work inside a nozzle, has two active positions, one in each channel, but in the same height, whereby the propeller may work in the longitudinal as well as in the transverse direction of the vessel.
• a downward aperture is situated remote from the propeller, at the rearward exit from the longitudinal channel, for discharge of water for forward propulsion. The propeller is only to work in the two channels.
• US 4294186 shows a propeller which only has one active position, below the bottom of the vessel.
• the pull-up position is merely a "storing position”. This is an assembly of the type "retractible thruster” mentioned above.
• the propeller can only work in the transverse direction of the vessel in the lowered position.
• the propeller cannot be turned in any of the positions. Therefore, the propeller must be symmetrical in order to be able to work in both of the rotational directions, i.e. in order to produce drive force in both of the transverse directions of the vessel.
• the propeller can only work in a single level, below the bottom of the vessel.
• a steering and/or propulsion device of the type mentioned introductorily is provided, and is characterized in that the propeller/nozzle assembly is mounted for movement between two active drive positions, one position beiow the bottom of the vessel and one position in a transverse channel in the bottom portion of the vessel, whereby the direction of the rotational axis of the propeller is coincident with the longitudinal direction of the channel.
• the present invention relates to a propeller/nozzle assembly which can be situated in two active positions, a first active position pulled up/swung up in a downwardly open channel, and a second active position lowered/swung down below the bottom of the vessel. Both of these positions are active; i.e. that the propeller can work in both of these positions. In the pulled-up/swung-up position the assembly can also be used in shallow water, including to and from a quay or mooring site.
• the propeller/nozzle assembly is adapted to be raised and lowered by pivoting the stem of the thruster up and down, respectively, about a horizontal axis, i.e. that the thruster is of a so-called "swing-up" type, whereby the propeller/nozzle assembly prior to the swinging up is pivoted about the stem axis in order that the propeller/nozzle axis be parallel to the channel axis.
• the propeller/nozzle assembly is adapted to be raised and lowered by a translatory vertical movement, for instance when the stem is telescopical.
• Figs. 1 and 3 diagrammaticaliy show a "swing-up" version and a vertically movable version, respectively, of a thruster for conventional use, having only a lower operative position.
• Figs. 2 and 4 diagrammaticaliy show an embodiment of the invention in a "swing-up" version and a vertically movable version, respectively, the propeller/nozzle assembly being shown in the two operative positions.
• a thruster in a "swing-up" version and a vertically movable version, respectively, comprising a propeller/nozzle assembly 1 mounted on a stem indicated by its center line 2.
• the thruster is adapted to be pivoted and moved vertically, respectively, from a lower, operative position 0 N to an upper, not operative position S where the propeller/nozzle assembly is hidden in a recess R in the bottom portion of the vessel.
• Fig. 2 shows diagrammaticaliy an embodiment of the invention in which a thruster of a "swing-up" version, i.e.
• a thruster adapted to be pivoted about a horizontal axis A, has two operative positions, a lower operative position 0 below the bottom portion of the vessel and an upper operative position 0° in a downwardly open channel 3 in the bottom portion of the vessel.
• the thruster By turning the propeller/nozzle assembly 1 , in the lower operative position, in such a manner that the propeller axis extends parallelly to the axis of the channel 3 the thruster will, when it reaches the upper operative position, mainly function in the same manner as a conventional tunnel thruster.
• the thruster embodiment according to the invention it is, however, also possible to reverse the orientation of the propeller/nozzle assembly 1 in the upper operative position O 0 .
• the propeller/nozzle assembly is oriented in accordance with the desired thrust direction.
• Fig. 4 departs from that of Fig. 2 in that the thruster is of a so-called vertically movable version, while the functioning in other respects is identical, also as regards the orientation of the propeller/nozzle assembly in the upper operative position.
• Tunnel thrusters of a conventional type have a propeller which works in a tunnel of circular cross section extending through the underwater portion of the vessel, along or transversely of the longitudinal direction of the vessel.
• the propeller blades In order to achieve equal propeller action in both directions of the tunnel the propeller blades must be shaped with a symmetrical profile, i.e. without curved profile, whereby the action of the propeller is the same for both of the rotational directions. From the same reason it has not been possible to introduce a radial pitch distribution, which among else would have reduced the load on the propeller blade tips.
• Such a propeller blade shape is in fact contradictory to prevailing circulation theories and well established aero- and hydrodynamical principles.
• the propeller/nozzle assembly can be oriented in one direction or in the other direction prior to being brought into the channel, and the propeller blades may, consequently, be shaped with an optimal profile curvature and radial pitch distribution, respectively.

Landscapes

• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Nozzles (AREA)
• Power Steering Mechanism (AREA)
• Controls For Constant Speed Travelling (AREA)
• Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
• Paper (AREA)
• Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
• Nonmetallic Welding Materials (AREA)
• Road Signs Or Road Markings (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Catching Or Destruction (AREA)
• Actuator (AREA)
• Ship Loading And Unloading (AREA)
• Manipulator (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

Family

ID=19900250

Family Applications (1)

Country Status (9)

Cited By (4)

Families Citing this family (10)

Family Cites Families (4)

• 1997
  • 1997-01-09 NO NO970075A patent/NO305892B1/no not_active IP Right Cessation
• 1998
  • 1998-01-09 AU AU55799/98A patent/AU5579998A/en not_active Abandoned
  • 1998-01-09 DE DE69805053T patent/DE69805053T2/de not_active Expired - Lifetime
  • 1998-01-09 DK DK98900783T patent/DK0950005T3/da active
  • 1998-01-09 EP EP98900783A patent/EP0950005B1/de not_active Expired - Lifetime
  • 1998-01-09 WO PCT/NO1998/000007 patent/WO1998030440A1/en active IP Right Grant
  • 1998-01-09 ES ES98900783T patent/ES2178140T3/es not_active Expired - Lifetime
  • 1998-01-09 AT AT98900783T patent/ATE216673T1/de active
  • 1998-01-09 PT PT98900783T patent/PT950005E/pt unknown

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events