Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H11/00—Marine propulsion by water jets
  • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
  • B63H11/10—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof
  • B63H11/107—Direction control of propulsive fluid
  • B63H11/113—Pivoted outlet
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
  • B63B39/02—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by displacement of masses
  • B63B39/03—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by displacement of masses by transferring liquids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
  • B63B39/08—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using auxiliary jets or propellers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63H—MARINE PROPULSION OR STEERING
  • B63H11/00—Marine propulsion by water jets
  • B63H2011/008—Arrangements of two or more jet units
• • 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
  • B63H25/46—Steering or dynamic anchoring by jets or by rudders carrying jets

Definitions

• Propulsion device for multi-hull boat such as catamaran
• the present invention relates to a propulsion device for multihull boat such as catamaran.
• the propulsion devices for ship are used to perform on the one hand maneuvers port and positioning and the other transit. These two types of use, however, require distinct properties. Indeed, porting and positioning maneuvers require great flexibility and little power while transit requires great power to achieve maximum speed while requiring little or no maneuvering.
• Conventional propulsion devices generally consist of three main parts that are the power generating means (engine or turbine), the power user means (propeller or jet) and the means ensuring the transmission between them.
• propulsion devices may comprise a motor, a gearbox, a clutch, an inverter, a stop, a shaft line and a propeller.
• Other propulsion devices consist of a motor, a multiplier, a shaft line as short as possible and a jet turbine provided with a reversing bell and a stop.
• These propulsion devices may further comprise a gas or steam turbine, a reducer, a stop and a propeller or a jet turbine.
• the minimum power required for proper operation may damage the platforms during port maneuvers.
• the suction of the jets generally placed under the shell can result in shallow depth, the suction of sand and sludge may damage the vanes of the turbine.
• GB 1 194 510 it is proposed for a monohull to suck the seawater on the front of the boat to a pump driven by a motor and connected to this duct and two control units located on the center line of the boat, one forward and the other to the rear, each control unit being constituted by a water discharge nozzle that can change direction.
• a catamaran is provided with a channel passing through each float body from an inlet opening at the front, at the forward end of the float (neutral) to the rear end, the channel being connected to a pressure generator device placed on the bridge between each float, so that in the front we suck water to create “water impulse” and is expelled to the rear by an outlet nozzle or it is expelled as "brake water” at the front through the front channel opening.
• a pressure generator device placed on the bridge between each float, so that in the front we suck water to create "water impulse” and is expelled to the rear by an outlet nozzle or it is expelled as "brake water” at the front through the front channel opening.
• the propulsion devices must adapt to the specific problems related to the shape of the boat.
• a conventional catamaran tends to sink from the rear, thus increasing the wet surface of the hulls and the resistance to advancement.
• the present invention therefore aims to provide a multi-hull boat propulsion device such as catamaran overcomes these disadvantages, allowing to obtain a good performance both during maneuvering phases in port and during transit phases.
• the subject of the present invention is a propulsion device for a multihull boat such as a catamaran, comprising in particular at least one turbine, means for sucking up seawater and means for discharging seawater, characterized in that it comprises a seawater turbine driven directly by a motor in each of the shells, the seawater suction means being positioned at the front, preferably outside, of each hull in a zone overpressure generated by the bow blade and the means for discharging the seawater being positioned in each shell, on the rear of the axis of pivoting the boat to pitch, said discharge means having an output drivable pivotally and preferably opening inside the channel defined between two shells.
• the propulsion device according to the invention is particularly well integrated with the specific form of a multi-hull boat, in particular a catamaran and thus exploits all the advantages.
• the suction means are positioned on the front outside of each hull in an overpressure zone linked to the bow blade giving the turbines a natural boost.
• the propulsion device according to the invention is considerably simplified in that the outputs of the pivoting discharge means allow the absence of clutch between the engine and turbine.
• the absence of moving parts in the water eliminates the blocking problems that can occur with propellers and the risk of deterioration or snagging thereof.
• the means for discharging the seawater are constituted by at least one pivoting bent nozzle.
• This nozzle consists of a first tube in which is pivotally mounted a second tube of diameter slightly smaller than that of the first tube.
• the difference in diameter between the tubes can be compensated by a sleeving of the inner tube pivoting with a "slippery" material, compatible with seawater such a plastic material of PVC type, polyamide such as that known under the trade name "Ertalon”). Housings are cut in the sleeve to receive the O-rings sealing between the tubes.
• the tubes used may advantageously be stainless steel tubes of standard diameters or of suitable similar material.
• At one end of the inner tube is a reduction cone (ratio close to 2/1 for example) for pressurizing the water jet, the elbow or outlet nozzle being welded to the cone, small diameter side.
• each outlet nozzle or elbow is drivable in rotation between two positions of the jet of water downward or upward in which there is no propulsive force, the water jet outlet positions of the steps front and rear at 90 ° from either vertical position.
• the means for rotating the output nozzles may consist of cables, chains, pinched rod or the like, controlled automatically or manually without playing on the stopping of the engine.
• These drive means are welded on the base of the outlet elbow near the reduction cone, the cables, chains or rods passing inside vertical tubes welded to the outer tube of the nozzle and going back well above the floatation, which avoids the installation of expensive and unreliable cable glands.
• These means for rotating the nozzles can be actuated without having to play on stopping the engine.
• outlet nozzles forward to provide rearward and rearward propulsion to propel forward.
• the outlet nozzles can advantageously help with the removal of water, especially since the quantity of water ejected produces a scouring effect under the shells.
• An intermediate position of the outlet nozzles and consequently of the pivoting tubes at 45 ° from one or the other of the vertical positions makes it possible to close at least a large part of the exit of the outlet nozzle and / or to put facing each other existing orifices in each of the pivoting or fixed tubes.
• the discharge jets are directed towards pipes leading to one in a nozzle connected to the wick of the rudder, for the other in a pivoting nozzle located under a third bow (this nozzle can go out alone under the effect of pressurization).
• the propulsion device according to the invention also makes it possible to control and reduce platform movements such as rolling and pitching.
• propulsion device in dynamic positioning as described above and by providing ball valves, manually controlled for example, mounted on the pipes at the front and at the rear, it is possible to fill quickly plates of plates located one in front of the other at the back in the interval between hulls. So, if the boat tips, fill the rear trim box while quickly emptying the front trim box by gravity and reverse the maneuver if the front is relieved.
• the crates can also be filled to weigh down the boat are in the grounding position so that it is not subject to the swell.
• tanks formed by the walls of the lined hulls inside the boat by a bulkhead from the upper deck to the water level. These tanks are also an advantageous double hull in case of collision, which reduces the infrared radiation and can serve as protection in case of small arms fire.
• the propulsion device according to the invention may further comprise additional propulsion means or "boosters" formed in each shell at the rear of the engines of said device.
• Such additional propulsion means are chosen according to the size of the boat and its use.
• an autonomous pump unit of the type used by firefighters Their compactness, that is to say that they are simply placed in the shell and connected to the circuit to the suction means and the discharge means, can be easily removed for maintenance. It is also possible to use turbines of the same type as those of helicopters.
• the feeding of this pump unit is located on the lowest possible front in the channel between the hulls and as close as possible to the corresponding discharge in each hull at the rear of the grounding plane.
• These propulsion means are started without clutch and without reverse since they are used only when looking for a high speed or even when using the propulsion device according to the invention to control the roll.
• the propulsion device according to the invention is particularly well suited for a catamaran whose channel between hulls provides a venturi effect such as that described in patent EP 0 108 004 which proposes a catamaran-type boat with two hulls symmetrically arranged relative to each other.
• each hull having an asymmetry with respect to a vertical plane passing through the bow and parallel to the vertical mean plane, with a half-master torque more important and more advanced on the inside than on the outside while towards the back, from the master torque, the inner wall of each shell is in the form of a substantially helical surface with horizontal generatrices, with an upper generatrix substantially parallel to the middle plane boat and a lower generator coming under the hull.
• This particular geometry of each hull leads to define a venturi shape of the channel between the two hulls adding and controlling the inner bow blades, which tends to cause a heave of the bow of the ship, while the waves or blades outside bow are reduced.
• Such a boat thus makes it possible to recover in positive action a portion of the energy contained in the formed wave train to improve its sailing performance, in particular by lightening the boat from the rear and also from the front and by limiting the sinking of the back.
• the jets rely on the specific stationary wave of the boat and increases the volume of it.
• the follower blade which is part of the wake is captive in the channel between hulls and contributes to propulsion.
• the propulsion device has an excellent performance and provides a remarkable maneuverability.
• the propulsion device according to the invention can equip multi-hull boats such as catamarans of all sizes, that is to say the small pleasure boat or jumbo.
• FIG. 1 represents a front perspective view of a catamaran equipped with a device according to the invention
• FIG. 2 represents a cross-sectional view of the pivoting bent nozzles of a propulsion device according to the invention
• Figure 3 shows a side perspective view of a rudder of a boat equipped with a device according to the invention.
• FIG. 4 represents a sectional view of the lower part of a boat hull equipped with a nozzle according to FIG. 2.
• the propulsion device according to the invention is intended to be installed on multi-hull boats such as the catamaran C illustrated in FIG. 1 having two hulls 1 and a third bow 2.
• This device comprises a seawater turbine driven directly by a motor in each of the shells 1, seawater suction means positioned outside the front of each shell 1 in an overpressure zone generated by the blade. bow and means for discharging the seawater positioned in the rear interior of each shell 1, on the rear of the pivot axis of the boat pitch, said discharge means having an output drivable pivoting.
• turbines such as those used on construction sites and which can accept pebbles, sand, gravel, etc. without damage.
• the means for discharging the seawater are constituted by a pivoting bent nozzle 3 consisting of a first tube 3a in which is pivotally mounted a second tube 3b of diameter slightly smaller than that of the first tube 3a.
• the difference in diameter between the two tubes 3a, 3b is compensated by a sleeve M of the inner tube using a slippery material, compatible with seawater such as a polyamide or the like.
• the tightness between the tubes 3a and 3b is obtained by O-rings (not shown) placed in housing cut in the sleeve.
• At one end of the inner tube 3b is a reduction cone 4 for pressurizing the water jet, the elbow or outlet nozzle 5 being welded to the cone 3b, small diameter side.
• the outer tube 3a is fixed inside the hull and perpendicular to the axis of the ship while the inner tube 3b is engaged by the outside of the hull (not shown in Figure 2) in the tube 3a through the orifice formed in the shell. There is therefore no risk of waterway.
• a locking plate 8 is engaged on the outlet nozzle 5 and fixed from the outside on the shell.
• This locking plate 8 also has a circular sector which allows at least partial closure of the orifice of the outlet nozzle 5 when it is brought into position at 45 ° forwardly and upwardly. This circular sector also makes it possible to at least partially protect the outlet nozzle 5.
• the locking plate 8 further comprises a rolling system which accommodates the thrust of the reduction cone during delivery or a sliding flat seal.
• the swivel bent nozzle is installed in the shell 1 at the bilge (that is to say the rounded lower part which joins the ground plane and the wall of the hull 1 ).
• the outlet nozzle or elbow 5 is drivable in rotation between two water jet outlet positions downward or upward in which there is no propulsive force, the water jet outlet positions of the front and rear steps at 90 ° from either vertical position.
• An intermediate position of the outlet nozzles 5 and therefore of the tubes 3a, 3b pivoting, located at 45 9 of one or the other of the vertical positions makes it possible to seal at least a large part of the orifice of the nozzle of outlet 5, thanks to the circular sector of the locking plate 6, and / or to put one against the other existing holes in each of the tubes 3a, 3b.
• the wick of the rudder 7 has a rear portion 7a and a compensation front portion 7b allowing the rudder 7 to collect thrust forces related to propulsion by the nozzle 6.
• the rudder has a rotation over the entire horizon.
• the upper angle of the front portion 7b comprises a support device such as a bearing on the hull preventing bending of the hollow drill under the effect of the thrust.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
• Catching Or Destruction (AREA)
• Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=35445941

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (14)

• 2005
  • 2005-04-21 FR FR0504004A patent/FR2884799B1/fr not_active Expired - Fee Related
• 2006
  • 2006-04-14 EP EP06743697A patent/EP1877305A1/de not_active Withdrawn
  • 2006-04-14 US US11/912,053 patent/US20090215332A1/en not_active Abandoned
  • 2006-04-14 WO PCT/FR2006/000824 patent/WO2006111643A1/fr active Application Filing

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events