• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for disassembling and/or assembling an underwater section of a retractable thruster unit of a swimming vessel. In the method a supporting cradle (21) is detachably fixed to the underwater section (12) from below, and the thruster unit (10) is lifted so that the underwater section (12) is at least partly brought inside the well (17) formed in the bottom of the vessel. Lifting wires (24) of auxiliary lifting means (23) are connected to the supporting cradle (21) for supporting the thruster unit. Water is drained from the well (17), and the lower gear (13) is disengaged and the intermediate section and the lower gear are sealed. After that water is let to ingress into the well (17) and the underwater section (12) is lowered down by the auxiliary lifting means (23) to dock bottom or sea bed, from where the underwater section is picked up with a crane.
    公开号:ES2552830A2
    申请号:ES201590056
    申请日:2012-12-14
    公开日:2015-12-02
    发明作者:Esa RUOSTEMAA；Mikko Karppinen；Mikko KNUUTI
    申请人:Rolls Royce Oy AB；
    IPC主号:
    专利说明:

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    DESCRIPTION
    Procedure to disassemble and / or mount an underwater section of a retractable drive unit
    Technical field of the invention
    The present invention relates to a method for disassembling and / or mounting an underwater section of a retractable propeller unit of a vessel. The invention is directed specifically to a method for dismantling and / or assembling an underwater section of an azimuth retractable propeller unit comprising an upper gear connected to a power source, an underwater section that includes a lower gear connected to the true helix, and a vertical direction tube that connects the upper gear with the underwater section and that contains a vertical shaft through which power and torque are transmitted from the upper gear to the lower gear.
    Background of the invention
    A propellant unit described above is normally mounted on a vessel so that a well is formed first at the bottom of said vessel. The well is open downwards but the upper part of the well is provided with a cover plate whereby the well is sealed and closed upwards. The upper gear of the propulsion unit is placed above the cover plate which is provided with a sealed inlet through which the vertical steering tube extends from the upper gear to the underwater section of the propulsion unit. The well is conventionally sized so that the underwater section of the propulsion unit fits into it. Thus, if necessary, the propulsion unit can be raised so that the underwater section retracts completely into the well above the bottom of the vessel.
    From time to time, the drive unit needs maintenance and repairs and in some cases it has to be replaced by another drive unit. In the case of the prior art in which the propellant unit has to be removed for maintenance or repair the vessel has normally been taken to dry dock in which it has been possible to perform this type of maintenance or replacement work. Dry dock work on a boat is extremely expensive because working on a dry dock itself is expensive
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    and preparations to carry a dry dock boat take a long time. The downtime of a large boat can take a long time and that costs money. Therefore, attempts have been made to shorten delivery times and make it possible for maintenance and repair work to be done without taking the boat to a dry dock.
    Publication WO 2011/127987 describes a propulsion procedure in which the maintenance and repair work is carried out as a dry dock ”so that the propulsion unit is hoisted through a well or a lifting chamber on the roof of the vessel or within a dry maintenance space where maintenance and repairs must necessarily be done.
    Publication WO 97/27102 describes a method and an apparatus for removing a propeller assembly from and for mounting it in an opening at the bottom of a vessel. According to this publication, the vessel is equipped with a water-tight lifting chamber that extends from the bottom of the vessel to above the flotation line. For maintenance, the propulsion unit is lifted through the lifting chamber from the vessel.
    Publications WO 2005/100151 and WO 2009/126097 describe procedures and devices for disassembling / assembling tunnel propellers. Therefore, these publications are not directly comparable with the present invention. The main idea in both documents is that assembly work is done as underwater work. For disassembly / assembly a patm is mounted on the propeller tunnel, by means of said patm the propellant unit is removed and replaced. It is not necessary to take the boat to dry dock.
    Summary of the invention
    The object of the present invention is to provide a method for disassembling and / or mounting an underwater section of a retractable propeller unit of a vessel and by said procedure the problems related to the prior art are avoided or at least reduced to a minimum. The objects of the invention are achieved by the method and equipment characterized in the appended claims.
    Several advantages over the prior art can be achieved by the present invention. The procedure of the invention can be applied both for new installations
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    of buildings and for installed propellers. Docking is not necessary for procedure preparations. Because the berthing is not necessary, the downtime of the boat is shorter than before and the expenses related to the disassembly / assembly work are lower.
    Advantages, characteristic features and additional embodiments of the invention will be revealed in more detail in the following description of the invention, in which the invention is described with reference to the accompanying drawings illustrating various stages of disassembly of a propulsion unit.
    Brief description of the drawings
    Figure 1 is a side view of the drive unit according to the present invention, at a stage prior to the start of the disassembly process.
    Figure 2 shows the drive unit in a stage in which a support cradle has been fixed to the drive unit.
    Figure 3 shows the drive unit in an elevated position.
    Figure 4 shows the drive unit in an elevated position where the auxiliary lifting means are connected and fixed to the cradle.
    Figure 5 shows the propelling unit in a stage in which the underwater section of the propelling unit is released.
    Figure 6 shows the propulsion unit in a stage in which the underwater section is lowered below the bottom of the boat to be removed for maintenance / repair.
    Figures 7-10 show the different stages of assembly of the seawater intake valve on the well cover on the vessel.
    Detailed description of the invention
    Figure 1 shows an azimuth drive unit 10 that can rotate about a vertical axis for direction. The drive unit 10 comprises an upper gear 11 connected to a power source 16, an underwater section 12 that includes a lower gear 13 connected to the true propeller 14, and a vertical steerer tube 15 that connects the upper gear 11 with the gear lower 13. Said steering tube 15 contains a vertical shaft through which power and torque is transmitted from the upper gear 11 to the lower gear 13.
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    The drive unit 10 is mounted on a vessel so that a well 17 is formed at the bottom 18 of the vessel. The well is open from below but the upper part of the well is provided with a cover plate 19 whereby the well 17 is sealed and closed at the top. As shown in the drawings, the upper gear 11 of the drive unit 10 is placed above the cover plate 19 which is provided with a sealed inlet through which the vertical direction tube 15 extends from the upper gear 11 to the lower gear 13 of the drive unit 10. The well 17 is sized so that in an elevated position the underwater section 12 of the drive unit 10 comprising the lower gear 13 and the propeller 14 engages therein. The drive unit 10 is retractable and is provided with hydraulic lifting devices 20, for example cylinders by means of which the drive unit 10 can be retracted so that the underwater section can be carried completely into the well 17 above the bottom 18 of the boarding and descending back to the position shown in figure 1.
    The stage illustrated in Figure 1 before the actual disassembly work begins is a preparation stage. At this stage, illustrated in Figure 1 before the real disassembly work is initiated, it is a preparation stage. At this stage the tightness of the drive unit 10 is safe. Therefore at this stage, the propeller unit 10 becomes airtight if it was or before. Special sealing equipment is necessary to make the propeller unit 10 airtight. Also, the propeller 14 is locked in position. Well 17 can be filled with water at this stage.
    In the stage shown in Figure 2 a support cradle 21 for disassembly is fixed to the drive unit 10. The cradle 21 on which the underwater section 12 comprising the lower gear 13 and the true propeller 14 will be resting during the process Disassembly / assembly also includes a work platform for divers. The cradle 21 floats below the drive unit 10 and in contact with the underwater section 12 and is also fixed to said underwater section 12 by divers.
    Figure 3 shows the stage in which, firstly, the gear shaft of the upper gear 11 is disengaged between the power supply 16 and the upper gear 11. Next, the hydraulic lifting devices 20 have been used for raise the propeller unit 10 so that the underwater section 12 has been partially placed inside the well 17. The propeller unit 10 is mechanically locked into position in the
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    raised position with the supports 22. Said supports 22 were arranged between the upper gear 11 and the support frame of the boat. In Figure 3, the supports are arranged between the upper gear 11 and the cover plate 19 of the well 17.
    Figure 4 shows the drive unit 10 in its elevated position where the auxiliary lifting means 23 are connected and fixed to the cradle 21 to support the driving unit 10. The auxiliary lifting means 23 are preferably jacks provided with lifting cables 24 which are connected to the underwater section 12 of the propeller unit 10. In order to keep the underwater section 12 in balance while lifting there are preferably three jaws 23 with lifting cables 24. The lifting cables 24 are connected to the underwater section 12 by divers. As seen in Figure 4, the drive unit 10 is continuously supported in the position raised by the supports 22.
    The auxiliary lifting means 23, for example jacks, are arranged above the cover plate 19, preferably above the float line of the vessel. Therefore the cables 24 coming from said jacks 23 must pass through the cover plate 19 to reach the underwater section 12 to which they must be connected by the connection points 25. Therefore, the following preparations, as presented in Figures 7-10, must be carried out on the cover plate 19 if it was not originally paid for this type of operation.
    As Figure 7 shows, firstly a flange 32 for each lifting cable 24 has to be mounted and welded on the upper surface of the cover plate 19. Next, as Figure 8 shows, a intake valve is mounted of seawater 33 on each flange 32. After which a drill is mounted on the seawater intake valve 33 and a hole 26 is drilled towards the cover plate 19 through the water intake valve of sea 33. After drilling, the seawater intake valve 33 closes and the drilling machine 34 is removed. A blind flange 36 is then mounted on the seawater intake valve 33. These steps are shown in the Figures 9 and 10. However, if the right type of drill is not available, the holes 26 in the cover plate 19 can be made by flame cutting for a coarse diameter and polishing for the final diameter.
    Before the lifting cables 24 of the auxiliary lifting means 23 are connected to the cradle 21, pipes for the lifting cables 24 are mounted and connected to the valves
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    of seawater intake 33. In this way the lifting cables 24 run through the seawater intake valves 33 and within said pipes, they do not run in a free space. After these preparations, the lifting cables 24 are now ready to be connected to the cradle 21 by the connection points 25. In order to keep the cradle 21 with the underwater section 12 of the propeller unit 10 centered in the well 17, they mount adjustable lateral guides on the structure of the cradle 21. Said guides 27 rest against the inner wall of the well 17.
    Next, well 17 and the upper gear input shaft 11 are sealed and pressurized air is supplied inside the well 17. The purpose of the pressurized air supply is to evacuate water from well 17. After having evacuated the air from the well 17, the gasket 28 between the lower gear 13 and the direction tube 15, that is, the intermediate section of the drive unit 10 is loosened. When the gasket 28 has become loose, the lifting cables 24 are tightened to keep the lower gear 13 in its current place. Then the steering tube 15 with the upper gear 11 of the drive unit 10 is elevated, so that the upper and lower flanges 29, 30 of the gasket 28 are separated from each other and a space is formed between said flanges 29, 30 This is shown in Figure 5, When a suitable space is formed between the flanges 29, 30 the steering tube 15 with the upper gear 11 is mechanically locked in position with the supports 22.
    In the elevated position shown in Figure 5 and after the gasket 28 between the lower gear 13 and the steering tube 15 is loosened and the flanges 29, 30 are separated from each other, other linings 31 are mounted and sealed on said flanges 29, 30 of the lower end of the steering tube 15 and the lower gear 13. The purpose of this is to prevent water from entering the steering tube 15 and the lower gear 13. Next the side guides 27 are loosened and the water penetrates into well 17.
    Finally, in figure 6 it is shown that the cradle 21 with the underwater section 12 of the propeller unit 10 is lowered by the jaws 23 and the cables 24. At this stage, the underwater section 12 is supported by the cradle 21 that is fixed to the underwater section 12. The underwater section 12 is lowered, for example, to the bottom of the dike or the seabed. From the bottom of the dike or the seabed the underwater section 12 of the propulsion unit 10 can then be picked up with a crane. However, it is also possible to raise the underwater section 12 with the cradle 21 within the reach of a land-based crane using elevation points and elevation equipment (not shown) attached to the part
    bottom of the hull of the boat. Alternatively, it is also possible for the cradle and underwater section 12 of the propeller unit 10 to float within the reach of a land-based crane using buoyancy control. The divers will fix the crane cables to the cradle 21 and loosen the lifting cables 24 of the jacks 23.
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    When the propulsion unit or more precisely the underwater section 12 thereof is reassembled in its place or if a new underwater section is mounted, the assembly process will be executed in a reverse order to that explained above.
    In the foregoing, the invention has been described by way of examples with reference to the exemplary embodiments illustrated in the accompanying drawings. However, the invention is not limited only to the exemplary embodiments shown in the drawings, but the invention may vary within the scope of the inventive idea defined in the appended claims.
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    权利要求:
    Claims (11)
    [1]
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    1.- Procedure for gutting and / or mounting an underwater section of a retractable propeller unit of a vessel, the propulsion unit (10) comprising an upper gear (11) removably connected to a power source (16), including said underwater section (12) a lower gear (13) and a propeller (14), and an intermediate section with a steering tube (15) that connects the upper gear (11) with the underwater section (12), said vessel being provided from a well (17) formed at the bottom (18) of the vessel, within said well (17) said underwater section (12) can be retracted when the propulsion unit (10) is out of service, said well (17) ) closed at the top with a cover plate (19), so that in the disassembly of the underwater section (12) the procedure is characterized by the stages of:
    a) Fix a support cradle (21) removably to the underwater section (12) below, disengage the upper gear (11) from the power supply (16), and raise the drive unit (10) so that this way the underwater section (12) is at least partially inside the well (17) and mechanically lock the propulsion unit (10) into position in the elevated position,
    b) Connect auxiliary lifting means (23) provided with lifting cables (24) to the support cradle (21) to support the propulsion unit (10),
    c) Evacuate the water from the well (17) by supplying pressurized air into the well (17)
    d) Loosen the gasket (28) between the lower gear (13) and the intermediate section (15) of the drive unit (120),
    e) Raise the upper gear (11) and the intermediate section (15) beyond and mechanically lock them into position while the cradle (21) is supported in position by the auxiliary lifting means (23) so that a space is formed between the intermediate section (15) and the lower gear (13), and seal the intermediate section (15) and the lower gear (13) to prevent water from entering them,
    f) Let the water enter the well (17) and descend the underwater section (12) with the auxiliary lifting means (23), fix the cables of a crane, release the lifting cables (24) of the auxiliary lifting means ( 23), and pick up the underwater section (12) with the crane,
    and because to assemble the drive unit (10) the steps of the procedure (a-f) are executed in a reverse order to the disassembly process.
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    [2]
    2. - Procedure according to claim 1, characterized in that seawater intake valves (33) are mounted on the upper face of the cover plate (19) and holes (26) are made in the cover plate (19) in the seawater intake valves (33), whereby the lifting cables (24) of the auxiliary lifting means (23) are established to run through said seawater intake valves (33) and the holes (26) from the auxiliary lifting means (23) above the cover plate (19) to the cradle (21).
    [3]
    3. - Procedure according to claim 2, characterized in that the holes (26) in the cover plate (19) are made by drilling.
    [4]
    4. - Method according to claim 3, characterized in that the holes (26) in the cover plate (19) are drilled through the seawater intake valves (33).
    [5]
    5. - Method according to claim 2, characterized in that the holes (26) in the cover plate (19) are made by flame cutting for a coarse diameter and polishing for the final diameter.
    [6]
    6. - Method according to any of the preceding claims, characterized in that the support cradle (21) floats below the underwater section (12) and is fixed to said underwater section (12) by divers.
    [7]
    7. - Method according to any of the preceding claims, characterized by the provision of supports (22) to lock the drive unit (10) mechanically in position in the elevated position.
    [8]
    8. - Method according to any of the preceding claims, characterized by the provision of the cradle (21) with lateral guides (27) and resting them against the inner wall of the well (17) to keep the propulsion unit (10) centered on the well (17).
    [9]
    9. - Method according to any of the preceding claims, characterized by the provision of the intermediate section (15) and the lower gear (13) with sealing coatings (31) to prevent water from entering them, when formed a space between the intermediate section (15) and the lower gear (13).
    [10]
    10. Method according to claim 1, characterized in that the underwater section (12) with the cradle (21) are lowered towards the bottom of the dike or seabed to pick it up with the crane.
    5 11.- Procedure according to claim 1, characterized in that the underwater section
    (12) with the cradle (21) are raised within the reach of a land-based crane, whose lifting equipment is fixed to the bottom of the hull of the boat, so that the underwater section (12) with the cradle ( 21) are collected by said land-based crane.
    10 12.- Procedure according to claim 1, characterized in that the underwater section (12)
    with the cradle (21) float within the reach of a land-based crane using buoyancy control, the underwater section (12) with the cradle (21) being collected by land-based crane.
    13. Method according to any of the preceding claims, characterized
    because the steps of fixing the support cradle (21) to the underwater section (12), connect the lifting cables (24) of the auxiliary lifting means (23) to the support cradle (21), disconnect the lower gear (13 ) of the intermediate section (15) and seal them, and connect the crane lift cables to the cradle (21) are made by divers.
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    [14]
    14.- Procedure according to claim 1, characterized in that, before starting the disassembly and / or assembly work, the propulsion unit (10) is sealed with sealing equipment and the tightness of the propellant unit (10) is ensured.
    类似技术:
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    ES2710456T3|2019-04-25|Procedure to disassemble and / or assemble a submerged section of a retractable propulsion unit
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    JP2022003254A|2022-01-11|Ocean power generation system
    KR101250829B1|2013-04-09|Structure Having Thruster Water Tight Cover of Vessels and Method depositing Thruster Having the same
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    US9211615B2|2015-12-15|Propeller service method
    EP2909080B1|2017-01-18|Method of handling a unit in a marine vessel and an assembly in a marine vessel
    OA17410A|2016-09-29|Method for disassembling and/or assembling an underwater section of a retractable thruster unit.
    EP2909082B1|2017-04-19|An thruster assembly in a marine vessel
    KR20150010173A|2015-01-28|azimuth thruster repairing method in a ship
    同族专利:
    公开号 | 公开日
    ES2552830R1|2016-02-23|
    ES2552830B1|2016-09-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN111846167A|2020-07-29|2020-10-30|青岛海研电子有限公司|Seabed-based monitoring system|FR2560147A1|1984-02-23|1985-08-30|Citroen Messian Durand Engren|Ship propulsion assembly, which can be retracted into a well|
    DE4233662A1|1992-10-07|1994-04-14|Schottel Werft|Drive unit for water vehicles|
    EP2435294A1|2009-05-28|2012-04-04|Schottel GmbH|Rudder propeller vessel propulsion system and vessel equipped therewith and assembly and disassembly method therefor|
    US7992275B1|2010-09-16|2011-08-09|Thrustmaster of Texas, Inc.|Method for thruster withdrawal for maintenance or vessel transit without the need for an external crane, remote operated vehicle, or diver|
    法律状态:
    2016-09-30| FG2A| Definitive protection|Ref document number: 2552830 Country of ref document: ES Kind code of ref document: B1 Effective date: 20160930 |
    2021-08-24| PC2A| Transfer of patent|Owner name: KONGSBERG MARITIME FINLAND OY Effective date: 20210824 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES201590056A|ES2552830B1|2012-12-14|2012-12-14|Procedure to disassemble and / or mount an underwater section of a retractable drive unit|ES201590056A| ES2552830B1|2012-12-14|2012-12-14|Procedure to disassemble and / or mount an underwater section of a retractable drive unit|
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