EP2148810B1 - System for fixing a propeller nozzle to a structure that forms a vessel or a part of a vessel - Google Patents

System for fixing a propeller nozzle to a structure that forms a vessel or a part of a vessel Download PDF

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Publication number
EP2148810B1
EP2148810B1 EP08779076.2A EP08779076A EP2148810B1 EP 2148810 B1 EP2148810 B1 EP 2148810B1 EP 08779076 A EP08779076 A EP 08779076A EP 2148810 B1 EP2148810 B1 EP 2148810B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
attachment
attachment point
propeller
forces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08779076.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2148810A1 (en
EP2148810A4 (en
Inventor
Rune Garen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kongsberg Maritime AS
Original Assignee
Rolls Royce Marine AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rolls Royce Marine AS filed Critical Rolls Royce Marine AS
Publication of EP2148810A1 publication Critical patent/EP2148810A1/en
Publication of EP2148810A4 publication Critical patent/EP2148810A4/en
Application granted granted Critical
Publication of EP2148810B1 publication Critical patent/EP2148810B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B63H5/14—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
    • 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
    • B63H2005/1254—Podded azimuthing thrusters, i.e. podded thruster units arranged inboard for rotation about vertical axis
    • 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
    • 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
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • B63H5/165—Propeller guards, line cutters or other means for protecting propellers or rudders

Definitions

  • the present invention concerns an arrangement comprising a nozzle, a structure including a vessel or part of a vessel and a system for attaching said propeller nozzle to said structure.
  • the system includes tensioned struts.
  • Structures of this type typically include an azimuth propeller both of a pulling and pushing type, but the invention may also be used in relation to attachment of a nozzle to a hull with conventional shaft lines.
  • the propeller nozzles for azimuth propellers towards a gear housing with solid steel plates that are bolted and welded. This involves time-consuming processes, and in such processes there is a risk for imposing mechanical tensions that may result in permanent deformations and stress release. Furthermore these stresses may result in fatigue fracture and unwanted geometries.
  • During production it is furthermore a risk in connection with exposing vital parts such as bearings and gears, for sparks which can contribute to reduce the life span of the system considerably.
  • attachment methods may also represent hydrodynamic blocking effects as they prevent water flow.
  • the ability of the water to pass the structure is an important factor for achieving the desired additional force that is the purpose with this type of extra equipment as compared to a propeller without a nozzle.
  • a nozzle attachment according to the previously known art, is the area that is important for generating the additional force reduced.
  • the additional drag is increased and there is a risk for separation of the flow (relief) in and around the nozzle.
  • US 2006/0166571 discloses a system for attaching a propeller nozzle to a vessel.
  • EP 0816221 A2 shows a propulsion device for a vessel adapted to run in ice, with a pulling azimuth propeller with a nozzle.
  • RU 2128126 it is shown a double azimuth propeller with nozzles attached to a gear housing.
  • the present invention concerns an alternative solution where the above mentioned disadvantages are reduced in that the area of the attachment elements in the propeller flow is reduced, and in that simple and predictable mechanical stress conditions are achieved.
  • the invention concerns an arrangement according to claim 1.
  • Typical areas of use may be supply ship, tugs, icebreakers, dynamical positioning systems for platforms etc. where a nozzle surrounds a propeller that is supported in the structure.
  • the system includes at least one first attachment point for attaching the nozzle to the structure substantially for accommodating pressure forces.
  • the system further includes at least one second attachment point for attaching the nozzle to the structure for accommodating pressure forces; and at least one strut attached in at least one strut attachment point on the nozzle, for accommodating forces in tension.
  • the at least one strut extends between the nozzle and the structure.
  • the at least one strut can typically include a turnbuckle for tensioning the strut.
  • the strut is typically a steel wire or steel rod. Synthetic ropes may also be used as these in many conditions have better resistance against fatigue and improved resistance to stress corrosion. Alternatively may other methods for tensioning the struts be used.
  • the strut may for instance be formed as a threaded rod that can be attached with a nut in a common way.
  • the attachment points for the struts may typically include ball joints to ensure that only forces in tension are transferred to the struts.
  • the tension in the struts may be adjusted such that it is ensured that it always is transferred tension in the struts. Sensors that measure tension or mechanical stresses for instance strain gauges can be used to monitor the stress conditions.
  • the second attachment point for attaching the nozzle may include an attachment part extending between the nozzle and the structure.
  • This attachment part may for instance be a rigid element with a through going opening for a bolt.
  • the attachment of the attachment part at each end may be made such that the attachment may be calculated as a hinge point.
  • the attachment part shall primarily take up forces in tension, but can also be designed to take up some pressure, for instance as a redundant system if the struts should fracture.
  • the part may also be designed such that it can take up moment imposed on the nozzle in relation to the structure. Such moment will substantially form a load sideways on the part.
  • It may typically be at least two first attachment points for taking up pressure forces, and these will typically be placed at each side of the second attachment point described above.
  • it may be at least two attachment points for taking up the pressure forces, and these may be placed at each side of the point for taking up pressure forces.
  • the nozzle may have a substantially circular cross section in a plane substantially parallel to a plane defined by the propeller. This plane will typically be parallel to the plane that is defined by the openings through the nozzle.
  • the circular cross section has a center substantially adjoining with an axis of revolution for the propeller.
  • the location of the attachment point can be defined in radial directions and at a distance in relation to the axis of revolution of the propeller, such that it is formed angles between the radii extending between the attachment points and the axis of revolution of the propeller.
  • the radii between the at least two first attachment points for taking up pressure forces and the axis of revolution may be located at each side of the radius between the axis of revolution and the second attachment point.
  • struts may typically be two or several struts for accommodating forces in tension. These are attached in the strut attachment points in the nozzle.
  • the radii between these strut attachment points and the axis of revolution may typically form an angle in an order of magnitude of 120°.
  • the number of struts and their mutual location may however be varied as needed. If several struts are used, will the angle between the struts therein between or struts and the other attachment points be smaller. In many cases will the struts be placed in the third and fourth quadrant if one considers a coordinate system with origo at the axis of revolution of the propeller.
  • the struts may also be used to ensure that no unwanted elements get into the propeller.
  • the attachment point or points for accommodating pressure forces do in some cases strictly speaking not need to take up anything else than pressure, and may be formed by two opposing surfaces that are pressed towards each other. These do not need to be attached to each other as such.
  • the angles between the radii for the strut attachment points and the second attachment point may be approximately 120°. Tests have however shown that exactly 120° not is what gives the best stress conditions in all situations, and the struts may therefore be somewhat adjusted in relation to the stress conditions.
  • Figure 1 shows a typical azimuth unit with a structure 5 including a gear housing and a portion for attachment to a vessel, typically a boat or a ship.
  • a nozzle 4 is attached to the structure 5 and is placed around a propeller (not shown) with an attachment system according to the invention.
  • the attachment system includes tension strut/tie rod 1 between the nozzle 4 and the structure 5, extending from a strut attachment point 1' on the nozzle 4 and to one strut attachment point 1" on the structure 5.
  • the attachment part 3 between the nozzle 4 and the structure 5 ensures simple mechanical conditions in relation to tension in the tension attachment point 3'.
  • the attachment point 3' on the nozzle be attached directly in the attachment point 3". However this would require more accurate production tolerances and could lead to more complicated conditions in relation to tension.
  • the tension struts 1 are biased or tensioned between the nozzle 4 and the structure 5 between the strut attachment points 1' and 1" to ensure simple stress conditions and to prevent vibrations or other unwanted motion between the structure 5 and the nozzle 4.
  • the biasing of the tension struts 1 ensure that the attachment part 3 only accommodate forces in tension.
  • the attachment points 2', 2 accommodate stresses in pressure, and are placed at each side of the attachment point 3' that takes up stresses in tension.
  • the attachment point 3' for stresses in tension that is placed between the attachment point 2 for stresses in pressure is attached in the attachment part 3 that furthermore is attached to the nozzle 4 via the bolt 7 and is attached by the other bolt 7 attached in the attachment point 3" of the structure 5. In that the attachment part 3 is attached with bolts 7, 8 at each side, it is ensured that the part 3 substantially only transfers pure tension.
  • the tensioned struts 1 also ensure that only tension is transferred between the attachment point 1' of the nozzle 4 and 1" of the structure 5.
  • figure 3 is furthermore the attachment of the nozzle 4 to the structure 5 shown.
  • dashed lines that indicate the angle between the attachment elements 1, 2, 3 in relation to an axis represented by an axis of revolution for a propeller (not shown).
  • an angle a between two struts 1 at one end attached in the nozzle 4 in attachment point 1', and at its other end attached in the attachment point 1" of the structure 5.
  • An angle b between a line extending between the axis of revolution for the propeller and the attachment point 1' and a line extending between the axis of revolution of the propeller and the other attachment point 3' may be approximately 120°.
  • FIG 4 it is shown an alternative embodiment to the invention where a nozzle 4 is attached to a structure 5 via strut 1 with an attachment point 1" in the nozzle and 1" in the structure.
  • Bolts 6 form along with the brackets 2 with attachment points 2' and 2" a hinged connection for the upper part of the nozzle.
  • the bracket 2 takes up pressure.
  • the attachment part 3 is shown as a fixed element between the nozzle 4 and the structure 5, and accommodates forces in an opposite direction in relation to the struts 1.
  • Figure 5 shows the same embodiment as figure 4 , seen from the front.
  • the attachment part 3 is shown as a plate shaped body rigidly attached to the structure 5 and the nozzle 4. The angle between the attachments 1', 1", 2', 2", 3', 3" and the struts 1 and the placement of the elements are clearly shown.
  • FIG 6 it is shown yet another alternative embodiment of the invention where a nozzle 4 is attached to a structure 5 via strut 1 with attachment point 1' in the nozzles 4 and 1" in the structure 5.
  • Bolts 8 form along with two attachment parts 3 a hinged attachment of the upper part of the nozzle to the structure 5.
  • Attachment point 2' is in this embodiment shown between a fixed element between the nozzle 4 and the structure 5, taking up forces in pressure.
  • the bracket 2 only includes elements in the structure 5 and the nozzle 4 with opposing faces that can take up the pressure.
  • the expression attachment point 2' can in this connection be a point that only is capable of taking up forces in pressure.
  • Figure 7 shows the same embodiment as figure 6 , seen form the front.
  • the attachment parts 3 are shown as bodies adapted to take up tension, rigidly attached in the structure 5 and the nozzle 4.
  • the angle between the attachments 1', 1", 3', 3", the bracket 2 and the struts 1 and the placement of the elements are clearly shown.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP08779076.2A 2007-05-25 2008-05-23 System for fixing a propeller nozzle to a structure that forms a vessel or a part of a vessel Not-in-force EP2148810B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20072698A NO336513B1 (no) 2007-05-25 2007-05-25 System for innfesting av en propellerdyse til en konstruksjon som utgjør et fartøy eller en del av dette
PCT/NO2008/000180 WO2008147208A1 (en) 2007-05-25 2008-05-23 System for fixing a propeller nozzle to a structure that forms a vessel or a part of a vessel

Publications (3)

Publication Number Publication Date
EP2148810A1 EP2148810A1 (en) 2010-02-03
EP2148810A4 EP2148810A4 (en) 2013-04-03
EP2148810B1 true EP2148810B1 (en) 2015-03-18

Family

ID=40075305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08779076.2A Not-in-force EP2148810B1 (en) 2007-05-25 2008-05-23 System for fixing a propeller nozzle to a structure that forms a vessel or a part of a vessel

Country Status (4)

Country Link
EP (1) EP2148810B1 (no)
DK (1) DK2148810T3 (no)
NO (1) NO336513B1 (no)
WO (1) WO2008147208A1 (no)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2780225B1 (en) * 2011-11-18 2021-04-14 Kongsberg Maritime Sweden AB A method of and a device for reducing the azimuthal torque acting on a pulling pod unit or azimuth thruster
KR101497394B1 (ko) * 2013-06-28 2015-03-02 삼성중공업 주식회사 선박
KR101491667B1 (ko) * 2013-06-28 2015-02-09 삼성중공업 주식회사 선박의 추력 장치
JP7144001B2 (ja) * 2018-04-20 2022-09-29 治 狩野 推進装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3244135A (en) * 1960-11-21 1966-04-05 Eastern Res Group Device for controlling ship movement
FI962672A0 (fi) 1996-06-28 1996-06-28 Finnyards Oy Propulsionsanordning foer isgaoende fartyg
RU2128126C1 (ru) 1998-03-04 1999-03-27 Центральный научно-исследовательский институт им.акад.А.Н.Крылова Судовая винторулевая колонка для движения и маневрирования судна в ледовых условиях
US5906522A (en) * 1998-04-01 1999-05-25 Hooper; Robert P. Thrust enhancer for marine propeller
DE20021466U1 (de) * 2000-12-19 2001-05-03 Schottel GmbH & Co.KG, 56322 Spay Wasserfahrzeug mit einem unter seinem Boden außenbords angeordneten Ruderpropeller
AUPR400601A0 (en) * 2001-03-27 2001-04-26 Allen, Robert Marine propulsion device
US7229331B2 (en) * 2005-01-24 2007-06-12 Enviroprop Corporation Shroud for a hydro thrust device

Also Published As

Publication number Publication date
DK2148810T3 (da) 2015-06-22
WO2008147208A1 (en) 2008-12-04
EP2148810A1 (en) 2010-02-03
EP2148810A4 (en) 2013-04-03
NO336513B1 (no) 2015-09-14
NO20072698L (no) 2008-11-26

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