SLUICE DEVICE FOR AN ROV

Abstract

A sluice device suitable for a remotely cable operated vehicle. A water tight compartment has a first and a second sluice gate. The sluice device includes a system for enabling launching, operating, and retrieving of the remotely cable operated vehicle. An insert for converting an existing torpedo tube to a sluice device, and a torpedo shaped transport container for an insert.

Description

TECHNICAL FIELD OF THE INVENTION

The present invention refers to sluice devices for remotely cable operated underwater vehicles. It also refers to an insert for upgrading an existing torpedo tube of a submarine to become such a sluice device.

BACKGROUND OF THE INVENTION

“Remotely operated vehicle” (ROV) is a term normally used to designate an under-water vehicle operated from a surface vessel via a cable, said cable is sometimes called “tether”, or “umbilical cord” or just “umbilical”, with or without the extension “cable”. The purpose of operating the ROV may be all kinds of missions, for example technical maintenance of underwater installations within the offshore industry, search, investigation of accidents or surfacing of parts from crashed aircraft or sunken vessels, or general research of sea bed.

Another purpose, and a main reason for using an ROV in a defence application, is the advantage to be able to perform operations in a concealed manner, hidden from enemy eyes and ears. Such operations may include surveillance missions etc.

However, at great depths the lengths of the umbilical cable may become a practical problem. It would therefore be convenient if the ROV could be operated from a submarine, which could bring the ROV close to the object of interest, thereby eliminating at least part of the need of cable length from surface down to operating depth.

Another benefit of operating the ROV from a submarine would be the almost lack of bad weather conditions. Surface storms, heave of the sea, and similar conditions are not present below the sea surface. This would therefore allow missions to be initiated without waiting for good weather.

U.S. Pat. No. 4,306,413 disclose a hydraulic power and control system for an elongated container able to house an underwater vehicle and which is capable of being mounted on the deck of a submarine. The container has top door means capable of being opened for release or recovery of the underwater vehicle.

The article “EURODOCKER—A Universal Docking—Downloading—Recharging System for AUVs: Conceptual Design Result” by Attilio Brighent et al, OCEANS '98 CONFERENCE PROCEEDINGS NICE, FRANCE 28 Sep. -1 Oct. 1998, NEW YORK, N.Y., USA, IEEE, US, vol 3, September 1998 (1998-Sep.-28) pages 1463-1467, XP010311858 ISBN: 0-7803-5045-6 discloses a managing system for AUVs (Autonomous Underwater Vehicles) including a submerged docking station for AUVs.

EP 0 169 219 B1 describes a remotely operated underwater vehicle and method of operating the same.

EP 0 236 026 A2 describes a tether cable management apparatus and method for a remotely operated underwater vehicle.

U.S. Pat. No. 5,868,524 describe a clamp system and method for connecting tubular bodies together.

The use of wires to control a torpedo is well known in the art. However the problem of controlling a torpedo is different from that of controlling an ROV. First, a torpedo is a disposable, single use type of equipment. Therefore, there is no incentive for developing torpedo tubes and wire control devices that enable control of a torpedo to return to the submarine and swim back into the torpedo tube. On the contrary, this could be a very risky endeavour.

On the other hand, when operating an ROV it would be highly desirable to have the possibility to make the ROV to return to the submarine where it was launched and to completely retrieve it.

A first problem to be solved is how to rewind umbilical cable when the ROV returns to the submarine. A second problem is how to avoid the cable from becoming entangled. A third problem is how to prevent the cable from wearing against parts of the sluice device and/or the submarine itself A fourth problem is to provide a device for solving the first and second problem easily and at a reasonable cost.

It is an object of the present invention to provide a device that solves the above described problems.

This object is fulfilled according to the invention by a sluice device as claimed in claim 1.

SUMMARY

In fact, the present invention refers to a sluice device, such as a torpedo tube of a submarine, which has been provided with means for allowing a cable operated ROV to be launched, operated and retrieved with the aid of said sluice device. The sluice device is provided with a telescopic cable guide apparatus for guiding the cable via a pulley arrangement arranged at its distal end. The cable guide apparatus is able to telescopically fold between an extended position and a folded position within the sluice device, thereby making it possible to close a distal sluice gate of the sluice device.

Further, the sluice device is provided with a constant tension cable winch to keep a constant tension in the tether cable, for preventing the cable from getting tangled. The sluice is further provided with proper cable guiding means for guiding the cable from the pulley arrangement in the distal end of the telescopic cable guide apparatus to the cable winch.

In preferred embodiments the sluice device for operating an ROV is achieved by combining an existing torpedo tube with a special torpedo tube insert, the insert comprising the necessary parts to convert the torpedo tube to a sluice device for an ROV as described above, i.e., it comprises a telescopic cable guide and a cable winch and possibly an emergency cable cutter.

In a further preferred embodiment the insert is provided as part of a torpedo shaped transport container having the dimensions and shape of a torpedo for the torpedo tube such that taking aboard and installation can be performed easily in the submarine. The container also having the ability to house all necessary equipment to be able to operate the ROV, e.g., the ROV itself, an operators console, power and control electronics. Special tools necessary for mounting may also be housed.

The transport container is provided with means for securing the necessary equipment to the inside of the transport container. The transport container is further provided with means to be opened and stored onboard the submarine, where it will serve as a storage device for the necessary equipment. Approximately half-way its middle third the transport casing is divisible into a wet end portion and a dry end portion. The wet end portion is intended to be mounted inside the torpedo tube, and is provided with means to house the ROV itself and the cable cutter and cable winch. The dry end portion is intended to be mounted in a suitable place within the submarine to allow an operator to control the ROV.

Thus accordingly, there is provided a kit of parts comprising the parts of the torpedo tube insert and transport container of above and further comprising an operators console and a power electronics cabinet, and a control electronics cabinet, and where the transport container and the console and cabinets are adapted such that the operators console and the power electronics cabinet, and the control electronics cabinet are contained and enclosed within the torpedo shape of said transport container and within standard torpedo dimensions of said transport container. The operators console and the power electronics cabinet, and the control electronics cabinet are arranged in the dry end portion. The dry end portion and the wet end portion are separated by a dividing wall. The cable winch and cable guiding machinery, including the telescopic guiding apparatus as described above is arranged in the wet end portion. A such kit of parts solves much of the practical problems concerning ease of transport and installation arising when trying to modify an existing torpedo tube onboard an existing submarine to be able to function as a launching and retrieval device for a cable controlled, remotely operated vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, wherein:

FIG. 1 a shows a side view of an ROV sluice device in an ROV operating position.

FIG. 1 b shows the ROV sluice device of FIG. 1a as seen from above.

FIG. 2 a shows a side view of the sluice device of FIG. 1a in a stand by position.

FIG. 2 b shows the sluice device of FIG. 2a as seen from above.

FIG. 3 a shows a side view of a transport container for an ROV system including a tube converting insert.

FIG. 3 b shows the transport container of FIG. 3a as seen from above.

FIG. 4 a shows winch box and a winch drum together with a first cable guide organ for sluice device of FIG. 1a.

FIG. 4 b shows a third cable guiding organ for the sluice device of FIG. 1a.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

FIG. 1 a shows a side view, and FIG. 1b shows a view from above, of an ROV sluice device 100 in an ROV operating position. Within a torpedo tube 101 is provided a winch box 115 comprising a winch drive motor and control electronics for unwinding and winding the umbilical cable with even tension. The box may also include power conversion means for providing appropriate power for drive motor. The winch drive motor is mechanically connected to a winch drum 125. The winch drum 125 is preferably arranged having its axis of rotation parallel with the length axis of the torpedo tube 101.

Inside the torpedo tube 101 is mounted a rail 110 for a telescopic cable guide 135. The telescopic cable guide comprises preferably an elongated member 135 slideable along the rail 110 from a folded position where it is contained within the length of the torpedo tube 101, to an extracted position where a distal end 145 of the elongated member becomes positioned a distance outside the submarine outside hull. The elongated member 135 is provided with appropriate first 120 , second 122, and third 145 cable guiding organs for appropriately guiding the cable 150 from the cable drum 125 to alongside the rail, further along the elongated member 135, and further, at the distal end, guiding the cable 150 between the distal end 145 of the elongated member 135 and the ROV 155. In fig. la and b the telescopic cable guide 135 is shown in an extracted position. The telescopic cable guide is preferably arranged to be extracted by the movement of the ROV 155 when the ROV 155 is launched, and folded by the force exerted by the cable winch when the ROV 155 is pulled back into the torpedo tube 101. In another embodiment the extraction and withdrawing of the elongated member 135 may be accomplished by means of a separate drive organ, e.g., an electric motor properly coordinated with the winch drum drive motor. The elongated member 135 is preferably hollow, i.e., of a tubular design, allowing the cable to run inside the tubular design.

Shown on FIG. 1a and 1b is also a front hatch 130 of the torpedo tube and the submarine outside hull 140, represented by boxes 140. A locking shoulder 105 may be provided to secure the rail to the torpedo tube wall.

FIG. 2 a shows a side view of the sluice device of FIG. 1a in a stand by position. FIG. 2b shows the sluice device of FIG. 2a as seen from above.

The inventive concept also comprises a method for converting an existing torpedo tube for regular torpedoes to a sluice device for a remotely cable operated vehicle, the method comprising the following steps:

• Providing a torpedo tube;
• Providing an ROV insert;
• Opening the rear hatch 210 of the torpedo tube 101;
• Sliding the ROV insert via the torpedo tube rear hatch 210 into the torpedo tube;
• Connecting control electronics of the ROV insert to an existing electrical internal connector of the interior of the torpedo tube.The method may further comprise the following steps:
• Providing a container for ROV electronics and ROV operators console;
• Mounting said operators console at a convenient place inside the submarine;
• Mounting ROV electronics at a convenient place inside the submarine;
• Connecting ROV electronics to submarine mains or similar;
• Connecting electronics to torpedo tube external connector for connecting to winch and ROV via internal connector of torpedo tube.FIG. 3a shows a side view of a transport container 300 for an ROV system including a torpedo tube converting insert. The container 300 having a front end 330 and an aft end 340. The insert comprises an ROV launching frame 320 and a cable guidance system together with winch box and winch drum. The cable guidance system comprises a rail and an elongated member, and first, second and third cable guidance organs as described above. The transport container can be divided into a front 345 and an aft portion 350 along a dividing wall 310. The dividing wall is preferably arranged somewhere between one third and two thirds of transport container length from aft end. The torpedo tube converting insert comprises front end of container and components as described above. FIG. 3b shows the transport container of FIG. 3a as seen from above. The aft portion 350 of the transport container 300 may hereinafter be referred to as the “dry portion of the container”. The dry portion of the container is devised to house, during transport, an operator's console 355, a power electronics cabinet 360 and a control electronics cabinet 365.

FIG. 4 a shows a winch box 405 and a winch drum 415 together with a first cable guidance organ 425 for sluice device of FIG. 1a. Parallel to the axis of the cable drum 415 is arranged a diamond screw for distributing the cable evenly over the drum 415. In alternative embodiments other organs for even distribution may be considered.

In a preferred embodiment a first cable guiding organ 420 comprises a cable guide member 425 that is arranged to be articulated such that it may turn around the diamond screw and guides the cable down towards the periphery of the cable drum 415. The cable guide member 425 is preferably a curved sliding chute or a curved rail having a number of rolls enabling the cable to run with low friction.

FIG. 4 b shows in a side view a third cable guiding organ 490 for the sluice device of FIG. 1a. The third cable guiding organ 490 is arranged at a distal end of the elongated member 430. It comprises a first articulated joint 435 that permits a cable pulley with a further cable guiding member rotate freely around an axis parallel to a length axis of the elongated member 430. The third cable guiding organ 490 further comprises a second articulated joint 440 permitting the further cable guiding member to pivot from approximately 5 to 90 degrees relatively to the direction of the length axis of the elongated member 430. The first and second articulated joints 435, 440 may be combined in the same joint. The projection into the plane of the drawing of the range of movement 450 of the cable guide guiding organ is indicated by dashed line. Support wheels 445 are arranged where the cable 427 leaves and enters the cable guiding organ 490.

Legend

• 100 Sluicing device
• 101 Torpedo tube
• 105 Locking shoulder
• 110 Rail/Guide
• 115 Winch and transformer
• 120 First cable guide
• 122 Second cable guide
• 125 Winch drum
• 130 Distal sluice gate
• 135 Cable protection with explosive bolt
• 140 Submarine outer hull
• 145 Cable pulley
• 150 Umbilical cable
• 155 ROV
• 205 Wet end of torpedo tube insert
• 300 ROV system transport container
• 305 Dry portion of transport container
• 310 Dividing wall
• 400 Cable management device
• 405 Winch box
• 410 Diamond screw
• 415 Cable drum
• 425 Cable guide member
• 427 Cable
• 430 Elongated member
• 435 Articulated joint 1
• 440 Articulated joint 2
• 445 Support wheels
• 450 Range of movement
• 490 Third cable guide

Claims

1. A sluice device (100) suitable for a remotely cable operated vehicle (155), comprising a water tight compartment (101) having a front hatch (130) and a rear hatch (210) characterised in that said sluice device is provided with means for enabling launching, operating, and retrieving of the remotely cable operated vehicle, said means including a cable winch (125) and a cable guidance system (120, 122, 135, 145) for preventing the cable (150) to wear against portions of the sluice device, and for preventing the cable from becoming entangled, and wherein the cable guidance system comprises a telescopic guide apparatus able to telescopically fold between an extended position and a folded position.

2. The sluice device of claim 1 wherein said telescopic guide apparatus comprises a rail (110) in the watertight compartment (101), and an elongated member (135) slideable along said rail (110) for sliding said elongated member (135) to an extended position where a distal end (145) of said elongated member (135) reaches a distance outside the front hatch (130) and with cable guiding means (120, 122, 425, 490) for guiding the cable from the cable winch (125, 415) to the distal end (145) of the elongated member (135).

3. The sluice device of claim 1 or 2 further comprising a cable winch drum (125) and control means (115) for said drum to maintain an even tension in the cable (150).

4. The sluice device of claim 2 where a sliding of said elongated member (135) to an extended position is accomplished by letting the remotely operated vehicle (155) provide the mechanical energy needed for sliding.

5. The sluice device of claim 4 where a sliding of said elongated member (135) to a folded position is accomplished by letting the cable winch (115, 405, 125, 415) provide the mechanical energy needed for sliding.

6. The sluice device of claim 4 where a sliding of said elongated member (135) to a folded or extended position is accomplished by letting a separate driving device provide the mechanical energy needed for sliding.

7. The sluice device of claim 3 where the cable winch drum (125, 415) is arranged with its axis of rotation parallel with a length axis of the sluice device.

8. The sluice device of claim 7 where a diamond screw is arranged parallel to the axis of the cable drum (125, 415) for distributing the cable evenly over the cable drum (125, 415).

9. A torpedo tube insert for converting a torpedo tube to a sluice device (100) suitable for a remotely cable operated vehicle (155), the torpedo tube comprising a water tight compartment (101) having a front hatch (130) and a rear hatch (210) characterised in that said torpedo tube insert comprises means for enabling launching, operating, and retrieving of the remotely cable operated vehicle (155), said means including an ROV launching frame (320), a cable winch (125) and a cable guidance system (120, 122, 135, 145) for preventing the cable (150) from wearing against portions of the torpedo tube, and for preventing the cable from becoming entangled, and wherein the cable guidance system comprises a telescopic guide apparatus able to telescopically fold between an extended position and a folded position.

10. The torpedo tube insert of claim 9 wherein said telescopic guide apparatus comprises a rail (110) intended for the watertight compartment (101), and an elongated member (135) slideable along said rail (110) for sliding said elongated member (135) to an extended position where a distal end (145) of said elongated member (135) is devised to reach a distance outside the front hatch (130) and with cable guiding means (120, 122, 425, 490) for guiding the cable from the cable winch (125, 415) to the distal end (145) of the elongated member (135).

11. The torpedo tube insert of claim 9 or 10 further comprising a cable winch drum (125) and control means (115) for said drum to maintain an even tension in the cable (150).

12. The torpedo tube insert of claim 10 where a sliding of said elongated member (135) to an extended position is accomplished by letting the remotely operated vehicle (155) provide the mechanical energy needed for sliding.

13. The torpedo tube insert of claim 11 where a sliding of said elongated member (135) to a folded position is accomplished by letting the cable winch (115, 405, 125, 415) provide the mechanical energy needed for sliding.

14. The torpedo tube insert of claim 10 where a sliding of said elongated member (135) to a folded or extended position is accomplished by letting a separate driving device provide the mechanical energy needed for sliding.

15. The torpedo tube insert of claim 11 where the cable winch drum (125, 415) is arranged with its axis of rotation parallel with a length axis of the sluice device.

16. The torpedo tube insert of claim 15 where a diamond screw is arranged parallel to the axis of the cable drum (125, 415) for distributing the cable evenly over the cable drum (125, 415).

17. The torpedo tube insert of claim 9 further comprising a transport container for an ROV system where said container has the shape and dimensions of a torpedo and is adapted to provide a housing of the insert and where further the transport container is divisible at a dividing wall (310) positioned between one third and two thirds of transport container length from aft end.

18. The torpedo tube insert of claim 10 further comprising an operators console and a power electronics cabinet, and a control electronics cabinet, and where the transport container and the console and cabinets are adapted such that the operators console and the power electronics cabinet, and the control electronics cabinet, are contained within the torpedo shape and within the dimensions of said transport container.