WO2020140137A1 - Dispositif de protection destiné à un navire - Google Patents

Dispositif de protection destiné à un navire Download PDF

Info

Publication number
WO2020140137A1
WO2020140137A1 PCT/AU2020/050003 AU2020050003W WO2020140137A1 WO 2020140137 A1 WO2020140137 A1 WO 2020140137A1 AU 2020050003 W AU2020050003 W AU 2020050003W WO 2020140137 A1 WO2020140137 A1 WO 2020140137A1
Authority
WO
WIPO (PCT)
Prior art keywords
propeller shaft
spool
cutting edge
groove
propeller
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.)
Ceased
Application number
PCT/AU2020/050003
Other languages
English (en)
Inventor
Richard Caulfield
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.)
Environmental Separation Technologies Pty Ltd
Original Assignee
Environmental Separation Technologies Pty Ltd
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
Priority claimed from AU2019900025A external-priority patent/AU2019900025A0/en
Application filed by Environmental Separation Technologies Pty Ltd filed Critical Environmental Separation Technologies Pty Ltd
Publication of WO2020140137A1 publication Critical patent/WO2020140137A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B63H5/16—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 relates to protection from material, such as rope, fishing line or net.
  • the protection includes protection from material entering a seal of a propeller shaft bearing of a marine vessel or from material entering the bearing.
  • Marine vessels often inadvertently run through rope or fishing line/net which gets wound on to the propeller of the marine vessel. Further this material also can wind onto the propeller shaft. Friction and compression can cause this material to be forced, melted or extruded first into the seal of a bearing carrying the propeller shaft and even into the bearing itself. A damaged seal can cause lubricating oil to leak into the ocean. A bearing blocked with debris can cause increased wear due to the bearing overheating or seizure of the bearing.
  • AU 2001277421 uses a spool and cutter to pare away material wound around the spool.
  • the cutter sits close to the spool but in larger vessels wobble in the propeller shaft, and thus the spool, could permit material to pass under the cutter and move towards the shaft and seal (if fitted), and eventually into the bearing.
  • US 8062083 is an example of a“scissor type” cutter formed of a rotating blade 14 and a stationary blade 21 .
  • the side of the groove increases the radius of the hub closer to the propeller 2 than to the stern tube 4.
  • the present invention may address or at least reduce one or more of the above mentioned problems, including the problem of material entering the seal and/or the bearing.
  • a protector for a marine vessel comprising:
  • a spool through which a propeller shaft passes, wherein the spool is positioned between a propeller and a seal of a propeller shaft bearing and/or the propeller shaft bearing, wherein the spool is arranged to rotate with the propeller shaft;
  • a cutter fixed relative to the propeller shaft and having a respective cutting edge positioned adjacent the step and at a distance from an axis of rotation of the propeller shaft that is between the first radius and the second radius.
  • the step is part of a groove in the circumference of the spool.
  • the cutting edge is in the groove.
  • the respective cutting edge is arranged to remove accumulated material from the step and preferably to remove material from the groove.
  • the respective cutting edge is directed to cut material in the groove and which is moving with, or rotating in the same direction as, rotation of the spool. [0014] In an embodiment, the respective cutting edge is directed to act as, or like, a plough or scoop to remove material from the groove.
  • a length of the or each cutting edge is oriented to be substantially parallel with the axis of rotation of the propeller shaft.
  • a dimension of the cutting edge that is substantially parallel with the axis of rotation of the propeller shaft is substantially the same as a width of the respective groove.
  • the cutting edge is provided on a blade that is triangular in cross- section.
  • the or each cutting edge contacts or is close to contacting a bottom of the respective groove, such that there is negligible, or a relatively small, clearance between the bottom of the respective groove and the respective cutting edge.
  • the cutter is disposed radially of the circumference of the spool and the or each cutting edge is disposed on a blade portion which extends from a cutter body radially inwardly towards the spool and into step or groove.
  • the spool is comprised of a material relatively softerthan the cutting edge.
  • the spool is of a plastics material and the cutting edge is of a hard metal.
  • a protector for a marine vessel comprising:
  • a spool through which a propeller shaft passes, wherein the spool is positioned between a propeller and a seal of a propeller shaft bearing and/or the propeller shaft bearing, wherein the spool is arranged to rotate with the propeller shaft;
  • a cutter fixed relative to the propeller shaft and having a respective cutting edge positioned in the groove.
  • a protector for a marine vessel comprising:
  • a body connected to a propeller shaft or a propeller and positioned between the propeller and a seal of a propeller shaft bearing and/or the propeller shaft bearing, wherein material can be wound onto the body as it rotates with the propeller shaft;
  • the body comprises a collection region for collecting the material and which provides a barrier of increased diameterfordiscouraging the material from moving towards the propeller shaft bearing;
  • the collection region is also defined by a decrease in diameter.
  • a gap formed between the decrease in diameter and the increase in diameter forms a groove in the body.
  • a method of protecting a marine vessel comprising:
  • Figure 1A is a plan view of a protector according to an embodiment of the present invention.
  • Figure 1 B is an enlargement of a portion of Figure 1A;
  • Figure 2A is a side elevational cross-sectional view of the protector of Figure 1A according to an embodiment of the present invention
  • Figure 2B is an enlargement of a portion of Figure 2A;
  • Figure 3A is an end cross-sectional view of the protector of Figure 1 A according to an embodiment of the present invention.
  • Figure 3B is an enlargement of a portion of Figure 3A;
  • Figure 4 is an end cross-sectional view of an alternative protector according to an embodiment of the present invention.
  • a protector 10 comprising a spool 20 and a cutter 22.
  • the spool 20 is generally annulus shaped with a hole extending axially therethrough.
  • the spool 20 is mounted to a propeller 12 by bolts 27 (or in an alternative is mounted to the propeller shaft 18) with the propeller shaft 18 extending through the hole through the spool 20.
  • the cutter 22 is mounted to a bearing carrier 14 by bolts 26.
  • the propeller 12 is mounted to a propeller shaft 18 in the normal manner.
  • the propeller shaft 18 is rotatably mounted to a bearing 17 which is protected by a seal 16.
  • the seal 16 may be recessed in a cut-out of the spool 20 or the spool 20 may sit on the seal 16.
  • the bearing 17 is mounted to a marine vessel by the bearing carrier 14 in the normal manner.
  • the spool 20 is positioned between the boss of propeller 12 and the bearing 17.
  • the spool 20, being fixed to the propeller 12, will rotate with the propeller shaft 18.
  • the spool 20 has at least one step 21 in a circumferential surface of the spool 20 that increases a first radius R1 (see Figure 3B) of circumference 60 of the spool 20 closer to the bearing 17 relative to a second radius R2 (see Figure 3B) of circumference 56 of the spool 20 (which is closer to the propeller 12).
  • the step 21 forms a wall of a groove 30 in the spool 20.
  • the groove 30 is formed by a gap between a down step 23 and the up step 21 .
  • the cutter 22 is fixed to a mount 24 by a bolt 29.
  • the mount 24 is fixed relative to the bearing carrier 14 by one or more screws 26.
  • the cutter 22 has a respective cutting edge 34 (or 38 if the propeller is in rotating in the opposite direction) positioned adjacent the wall of the step 21 towards the bearing 17 (away from the propeller 12).
  • the cutting edge 34 is at a distance from an axis of rotation of the propeller shaft 18 that is between the first radius R1 and the second radius R2.
  • the wall created by the up step 21 of the groove 30 provides a barrier which discourages material that enters the groove 30 from moving axially towards the bearing 17. In case material does get past the step 21 , a second 32 or more grooves with cutting edges 36/40 can be provided.
  • the cutting edge 34 (or 36, 38, 40) is arranged to remove accumulated material from the groove 30 (or 32).
  • the cutting edges 34, 36, (or 38, 40) are directed to cut material in the groove 30,32 which is moving with, or rotating in the same direction as, rotation of the spool 20.
  • the respective cutting edges 34, 36, 38, 40 each act as, or like, a plough or scoop to remove material from the groove 30, 32.
  • a length of the or each cutting edge 34, 36, 38, 40 is oriented to be substantially parallel with the axis of rotation of the propeller shaft 18.
  • a dimension of the cutting edge 34, 36, 38, 40 that is substantially parallel with the axis of rotation of the propeller shaft 18 is substantially the same as a width of the respective groove 30, 32.
  • the cutting edges 34, 36, 38, 40 are provided on a respective blade portion 50 that is triangular in cross-section (see Figures 1 B and 2B). It is noted that other the blade portion 50 may be of other cross-sectional shapes, such as rectangular or trapezoidal.
  • the or each blade portion 50 is generally be tapered to form the respective cutting edge 34, 36, 38, 40.
  • the or each cutting edge 34, 36, 38, 40 contacts or is close to contacting a bottom 56 of the respective groove 30, 32, such that there is negligible, or a relatively small, clearance between the bottom 56 of the respective groove and the respective cutting edge 34, 36, 38, 40.
  • This clearance may increase if there is wobble in the propeller shaft 18.
  • the clearance is preferably significantly smaller than the change in radius provided by the step 21 so as to discourage material from getting past the step 21 and encourage the material to remain in the groove 30, 32 so that it can be cleared out by the cutting edges 34, 36, 38, 40.
  • the cutter 22 is disposed radially of the outermost circumference 60 of the spool 20.
  • Each cutting edge 34, 36, 38, 40 of the respective blade portions 50 is disposed on a respective projection 52 which extends from a body 58 of the cutter 22 radially inwardly towards the spool 20 and into the respective groove 30, 32.
  • the underside 54 of the projection 52 provides the clearance from it to the bottom 56 of the groove 30.
  • the underside 54 is typically curved to substantially match the curvature of the bottom 56 of the groove 30.
  • the cutter 22 may be provided with another cutting edge 70 which extends radially relative to the spool 20 to operate as the cutter described in AU 2001277421 , the contents of which is incorporated herein by reference.
  • a second cutter 22’ positioned circumferentially around the spool 20, each with a respective cutting edge positioned in the or each respective groove 30, 32.
  • the spool 20 is comprised of a material relatively softer than the cutting edge 34, 36, 38, 40.
  • the spool 20 is formed of a plastics material and the cutting edges 34, 36, 38, 40 is typically formed of a hardened metal.
  • the up step 21 may be provided without forming a wall of a groove.
  • the spool 20 is positioned on the propeller shaft 18 (or seal 16) so that it passes through a hole in the centre of the spool 20. It is fixed to the boss of the propeller 12 by bolts 27. It is located on the propeller shaft 18 between the propeller 12 and the propeller shaft bearing 17.
  • the cutter mount 24 is fixed to the bearing carrier 14 by bolts 26 and the cutter 22 is fixed to the mount by bolt 29.
  • Projections 52 having the cutting edges 34, 36, 38 and 40 are inserted into the grooves 30, 32 in the spool 20.
  • rotation of the spool 20 with the propeller shaft 18 causes any material (which may get past the cutting edge 70, if present) between the cutter body 58 and the spool 20 to run into the projection 52 and which are encouraged to move into the groove 30.
  • the up step 21 of the wall of the groove 30 encourages material to remain in the groove 30.
  • Rotation of the spool 20 will bring accumulating material in the groove 30 into contact with the cutting edge 34, 36, 38 or 40, which will cut/plough/scoop the material in an ablative manner.
  • the terms“comprising” or“comprises” are used inclusively and not exclusively or exhaustively.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Sealing Devices (AREA)

Abstract

L'invention concerne un dispositif de protection destiné à un navire comprenant une bobine (20) dans laquelle passe un arbre d'hélice (18) et un dispositif de coupe (22) fixé par rapport à l'arbre d'hélice. La bobine est positionnée entre une hélice et un joint d'étanchéité (16) d'un palier d'arbre d'hélice et/ou du palier d'arbre d'hélice. La bobine est agencée pour tourner avec l'arbre d'hélice. Au moins un cran (21) est présent dans une circonférence de la bobine et augmente d'un premier rayon R1 de la bobine plus près du palier d'arbre d'hélice par rapport à un second rayon R2 de la bobine. Le dispositif de coupe a un bord de coupe respectif (34) positionné adjacent au cran et à une distance d'un axe de rotation de l'arbre d'hélice qui est située entre le premier rayon et le second rayon.
PCT/AU2020/050003 2019-01-04 2020-01-06 Dispositif de protection destiné à un navire Ceased WO2020140137A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2019900025A AU2019900025A0 (en) 2019-01-04 A Protector for a Marine Vessel
AU2019900025 2019-01-04

Publications (1)

Publication Number Publication Date
WO2020140137A1 true WO2020140137A1 (fr) 2020-07-09

Family

ID=71406476

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2020/050003 Ceased WO2020140137A1 (fr) 2019-01-04 2020-01-06 Dispositif de protection destiné à un navire

Country Status (1)

Country Link
WO (1) WO2020140137A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4450670A (en) * 1980-02-15 1984-05-29 Robinson Richard L Weed cutter for boat motor
US4722667A (en) * 1986-04-15 1988-02-02 Sea-Land Corporation Rope and fish net guard
US4801244A (en) * 1986-06-27 1989-01-31 Flygt Ab Device
DE10002865A1 (de) * 2000-01-24 2001-07-26 Manfred Meincke Vorrichtung zur Verhinderung des Einzuges von Angelschnüren und sonstigem Tauwerk in den Innenbereich des Getriebegehäuses bei Sportbootantrieben
US7008277B2 (en) * 2000-08-10 2006-03-07 Environmental Separation Technologies Pty. Ltd. Cutting apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4450670A (en) * 1980-02-15 1984-05-29 Robinson Richard L Weed cutter for boat motor
US4722667A (en) * 1986-04-15 1988-02-02 Sea-Land Corporation Rope and fish net guard
US4801244A (en) * 1986-06-27 1989-01-31 Flygt Ab Device
DE10002865A1 (de) * 2000-01-24 2001-07-26 Manfred Meincke Vorrichtung zur Verhinderung des Einzuges von Angelschnüren und sonstigem Tauwerk in den Innenbereich des Getriebegehäuses bei Sportbootantrieben
US7008277B2 (en) * 2000-08-10 2006-03-07 Environmental Separation Technologies Pty. Ltd. Cutting apparatus

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