EP1401705B1 - Ship pod-mounted hydrojet propeller unit driven by a hollow electric motor - Google Patents

Ship pod-mounted hydrojet propeller unit driven by a hollow electric motor Download PDF

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Publication number
EP1401705B1
EP1401705B1 EP02740856A EP02740856A EP1401705B1 EP 1401705 B1 EP1401705 B1 EP 1401705B1 EP 02740856 A EP02740856 A EP 02740856A EP 02740856 A EP02740856 A EP 02740856A EP 1401705 B1 EP1401705 B1 EP 1401705B1
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EP
European Patent Office
Prior art keywords
ship
hydrojet
pod
electrical motor
propulsion
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Expired - Lifetime
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EP02740856A
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German (de)
French (fr)
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EP1401705A1 (en
Inventor
Jean-Edmond Chaix
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Societe Technique pour lEnergie Atomique Technicatome SA
TechnicAtome SA
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Societe Technique pour lEnergie Atomique Technicatome SA
TechnicAtome SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/22—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing
    • B63H23/24—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing electric
    • 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
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
    • B63G8/08—Propulsion
    • 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
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
    • B63H2011/081—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type with axial flow, i.e. the axis of rotation being parallel to the flow direction
    • 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
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
    • B63H2011/084—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type with two or more pump stages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H2023/005—Transmitting power from propulsion power plant to propulsive elements using a drive acting on the periphery of a rotating propulsive element, e.g. on a dented circumferential ring on a propeller, or a propeller acting as rotor of an electric motor
    • 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

Definitions

  • the invention relates to the field of propulsion of ships, submersible and unsinkable, by means of submerged thrusters, outside the shell, for example under or next to the shell of a submersible vessel, such as a boat, or any which side of the hull of a submarine. It relates to more particularly such a propulsion unit by hydrojet, driven by an electric motor.
  • propulsion In the field of ship propulsion, submersible or unsinkable, it is known to use several propulsion techniques using fully submerged propulsion pods. Among these, we quote propulsion by hydraulic jets, commonly called “hydrojet”. Such a technique is illustrated by the French patent application of the same filing this application and published under number 2 766 262. This technique uses the principle of the reaction, the water being sucked up by a water intake placed in front of the nacelle. A high efficiency pump, placed inside the latter, communicates energy to the water to propel it outside under the shape of a jet, through a nozzle, thus creating a thrust that propels the ship. Such a gondola can be oriented in azimuth, the direction of propulsion can be chosen by the rotation of said nacelle.
  • a such a gondola can also be oriented around a horizontal axis to allow the plate to be changed or the depth of a submarine.
  • the object of the invention is to propose a third type of submerged and placed naval thruster in a basket, avoiding the drawbacks associated with these two types of propellants.
  • the motor rotor is placed around the hydraulic screw.
  • the electric motor can be of two types, a first which is of the field type radial, the motor being of large external diameter, the second being of the axial field type, and being likewise inner diameter, but of greater length.
  • Figure 1 shows the propellant according to the invention, equipped with an electric field motor axial, i.e. with a rather elongated shape around axis 1 of the propellant.
  • Inside a nacelle 2 is therefore mounted rotating a shaft 3, by means 4V and 4R hydraulic thrust bearings, mounted respectively in a part before 2V and a part rear 2R of nacelle 2.
  • nacelle 2 Around the latter is fixed a screw hydraulic 7. On leaving the latter, the shape internal of nacelle 2 widens to form a channel rounded O-ring around the rear part 2R of the nacelle 2.
  • the hydraulic circuit of the thruster ends with a nozzle 10 fixed to the nacelle 2.
  • the electric motor is of the type immersed in water and is placed axially around the screw hydraulic 7.
  • the stator 11S is integral with the nacelle 2, while the rotor 11R is fixed around the hydraulic screw 7 and is therefore integrated on the assembly propulsion turn.
  • 11S stator and 11R rotor are jacketed.
  • the motor can be either synchronous or asynchronous.
  • 4V and 4R thrust bearings are of the type hydraulic, more precisely they are supplied with permanently by water in which the nacelle, under pressure.
  • FIG. 2 represents the propellant according to the invention in an embodiment using an engine of the radial type, i.e. the electric field is radial. Consequently, its outside diameter is a little more important than that of the axial motor used in the embodiment described in FIG. 1. On the other hand, its length is shorter.
  • Basket 12 is similar to basket 2 of Figure 1 and the rotating propulsion assembly is almost identical.
  • the screw, the vanes 8 of the pump helical-axial, the rectifiers 9 and the nozzle 10, are identical. It is the same for tree 3 of the rotating propulsion assembly which is also rotatably mounted, by 4V and 4R thrust bearings in respective front 12V and rear 12R parts of the basket 12.
  • the motor therefore includes a shaped rotor 21R discoid fixed around the hydraulic screw 17. It is placed between the two parts 21S of the stator which are fixed relative to the nacelle 12.
  • hydrojet propulsion technique Several advantages are inherent in the hydrojet propulsion technique. Indeed, at equal power, a propeller propeller rotates approximately at 150 rpm, while a hydrojet thruster turns at around 600 revolutions / minute. The size of motors being inversely proportional to speed of rotation, the motor, used in a technique hydrojet, is much more compact than the one used to drive a propeller.
  • hydraulic thrust bearings allows not to use ball bearings. This strengthens impact resistance, especially impact military.
  • the propulsion by hydrojet presents many benefits.
  • the type of pump, the speed, the causes it to be force-fed with a hydraulic screw and the water flow takes place in a confined channel are as many advantages compared to the propeller which turns in open environment and at low frequency. It is the same for the use of hydraulic thrust bearings, in replacement of noisy ball bearings.
  • the propellant according to the invention does not require no ventilation, lubrication or cooling.
  • the reverse thrust is done as on conventional hydrojets with a deflector concave, operated by a jack.
  • the efficiency of a helical-axial pump, used in the propellant according to the invention, associated to a hydraulic screw which feeds the pump inlet helical-axial, is around 75%. So we can consider a 10% increase in yield overall propulsion compared to a propeller Traditional.
  • propulsion by hydrojet and in particular by double hydrojet, can be harmoniously integrated into water lines and into the shapes of the ship's hull. In this case, it therefore finds much less cantilevered than a propellant propeller, detached from the hull of the ship in a nacelle mounted at the end of a mast. Hydraulic drag and tactical vulnerability is found considerably reduced.

Abstract

The hydrojet boat submerged propulsions system is low noise and has good output. It comprises principally a hydrojet propulsion system comprised of a hydraulic screw (7) feeding a helico-axial pump (8) emerging through downstream guide vanes (9). A nozzle (10) completes the assembly, which is supplied by lateral intakes (6). The electrical motor (11R, 11S) is represented axially, but can also be radial. The shaft (3) is rotationally mounted by means of hydraulic thrust bearings (4V, 4R). The system can be oriented in azimuth. Application in ship and submarine propulsion.

Description

Domaine de l'inventionField of the invention

L'invention concerne le domaine de la propulsion des navires, submersibles et insubmersibles, au moyen de propulseurs immergés, à l'extérieur de la coque, par exemple sous ou à côté de la coque d'un navire submersible, tel qu'un bateau, ou de n'importe quel côté de la coque d'un sous-marin. Elle concerne plus particulièrement une telle unité de propulsion par hydrojet, entraínée par un moteur électrique.The invention relates to the field of propulsion of ships, submersible and unsinkable, by means of submerged thrusters, outside the shell, for example under or next to the shell of a submersible vessel, such as a boat, or any which side of the hull of a submarine. It relates to more particularly such a propulsion unit by hydrojet, driven by an electric motor.

Art antérieur et problème poséPrior art and problem posed

Dans le domaine de la propulsion des navires, submersibles ou insubmersibles, il est connu d'utiliser plusieurs techniques de propulsion mettant en oeuvre des nacelles de propulsion complètement immergées. Parmi celles-ci, on cite la propulsion par jets hydrauliques, appelée communément « hydrojet ». Une telle technique est illustrée par la demande de brevet français du même déposant de la présente demande et publiée sous le numéro 2 766 262. Cette technique utilise le principe de la réaction, l'eau étant aspirée par une prise d'eau placée devant la nacelle. Une pompe à haut rendement, placée à l'intérieur de cette dernière, communique de l'énergie à l'eau pour la propulser à l'extérieur sous la forme d'un jet, par une tuyère, créant ainsi une poussée qui propulse le navire. Une telle nacelle pouvant être orientée en azimut, la direction de propulsion peut être choisie par la rotation de ladite nacelle. Ce type de propulseur permet donc à un navire d'effectuer n'importe quelle manoeuvre au port, de se stabiliser en route ou de faire du positionnement dynamique, sans utilisation d'un autre mécanisme. Une telle nacelle peut également être orientée autour d'un axe horizontal pour permettre de changer l'assiette ou la profondeur d'un sous-marin.In the field of ship propulsion, submersible or unsinkable, it is known to use several propulsion techniques using fully submerged propulsion pods. Among these, we quote propulsion by hydraulic jets, commonly called "hydrojet". Such a technique is illustrated by the French patent application of the same filing this application and published under number 2 766 262. This technique uses the principle of the reaction, the water being sucked up by a water intake placed in front of the nacelle. A high efficiency pump, placed inside the latter, communicates energy to the water to propel it outside under the shape of a jet, through a nozzle, thus creating a thrust that propels the ship. Such a gondola can be oriented in azimuth, the direction of propulsion can be chosen by the rotation of said nacelle. This type of propellant therefore allows a ship carry out any maneuver at the port, stabilize en route or do positioning dynamic, without using any other mechanism. A such a gondola can also be oriented around a horizontal axis to allow the plate to be changed or the depth of a submarine.

D'autre part, dans un deuxième type de propulsion par nacelle immergée, on peut également citer la demande de brevet français du même déposant, publié sous le numéro 2 768 119, qui décrit un propulseur naval à hélice centrale et moteur asynchrone discoïde. Un tel propulseur est constitué principalement d'un moyeu central entouré des aubes d'une hélice autour desquelles est fixé le rotor électrique de forme discoïde et un fourreau portant des paliers. Le stator est placé de part et d'autre du rotor électrique, autour des paliers. En d'autres termes, le moteur électrique entoure la canalisation à l'intérieur de laquelle se trouve l'hélice et dans laquelle passe le flux d'eau. Toutefois, ce type de propulseur ne présente pas un excellent rendement, est très bruyant et soumis aux problèmes de la cavitation.On the other hand, in a second type of propulsion by submerged pod, you can also cite the same applicant's French patent application, published under number 2 768 119, which describes a naval thruster with central propeller and asynchronous motor discoid. Such a propellant is constituted mainly from a central hub surrounded by blades a propeller around which the rotor is fixed electric discoid shape and a sheath carrying bearings. The stator is placed on either side of the electric rotor, around the bearings. In others terms, the electric motor surrounds the pipeline to the interior of which is the propeller and in which passes the water flow. However, this type of propellant does not perform very well, is very noisy and subject to cavitation problems.

Le but de l'invention est de proposer un troisième type de propulseur naval immergé et placé dans une nacelle, en évitant les inconvénients liés à ces deux types de propulseurs. The object of the invention is to propose a third type of submerged and placed naval thruster in a basket, avoiding the drawbacks associated with these two types of propellants.

Résumé de l'inventionSummary of the invention

L'objet principal de l'invention est donc un propulseur de navire, en nacelle, utilisant à la fois la technique de l'hydrojet et la propulsion par un moteur électrique creux, c'est-à-dire entourant les éléments hydrauliques propulseurs et le flux d'eau propulsé. Il comprend principalement une nacelle à l'intérieur de laquelle se trouvent les éléments suivants :

  • un moteur électrique ;
  • un ensemble tournant de propulsion entraíné par le moteur électrique ;
  • une tuyère de sortie, fixée à l'arrière de la nacelle, en aval de l'ensemble tournant de propulsion ; et
  • des redresseurs fixés à la nacelle.
The main object of the invention is therefore a ship propellant, in a nacelle, using both the hydrojet technique and propulsion by a hollow electric motor, that is to say surrounding the propellant hydraulic elements and the propelled water flow. It mainly includes a nacelle inside which are the following elements:
  • an electric motor;
  • a rotating propulsion unit driven by the electric motor;
  • an outlet nozzle, fixed to the rear of the nacelle, downstream of the rotating propulsion assembly; and
  • rectifiers attached to the nacelle.

Le propulseur se caractérise selon l'invention en ce que l'ensemble tournant de propulsion est de type hydrojet, et est constitué de :

  • une vis hydraulique ; et
  • une pompe hélico-axiale placée en aval et solidaire de la vis hydraulique ; et
   en ce que le moteur électrique est du type creux, c'est-à-dire ayant un rotor et un stator de diamètre relativement large et percé en leur partie centrale, afin d'entourer l'ensemble tournant de propulsion, pour que le rotor soit fixé autour de l'ensemble tournant de propulsion, dans le but de l'entraíner en rotation. The propellant is characterized according to the invention in that the rotating propulsion assembly is of the hydrojet type, and consists of:
  • a hydraulic screw; and
  • a helical-axial pump placed downstream and integral with the hydraulic screw; and
in that the electric motor is of the hollow type, that is to say having a rotor and a stator of relatively large diameter and pierced in their central part, in order to surround the rotating propulsion assembly, so that the rotor is fixed around the rotating propulsion assembly, with the aim of driving it in rotation.

Dans la réalisation préférentielle de l'invention, le rotor du moteur est placé autour de la vis hydraulique.In the preferential realization of the invention, the motor rotor is placed around the hydraulic screw.

Pour faire pénétrer l'eau à l'intérieur de la nacelle et en particulier en amont de la vis hydraulique, il est prévu d'utiliser des ouïes d'entrée placées latéralement.To make the water penetrate inside the nacelle and in particular upstream of the screw hydraulic, it is planned to use inlet vents placed laterally.

Dans la principale réalisation mécanique de l'ensemble tournant de propulsion, celui-ci est monté sur un arbre monté lui-même tournant dans la nacelle par des paliers et butées hydrauliques.In the main mechanical realization of the rotating propulsion assembly, this is mounted on a tree mounted itself rotating in the nacelle by bearings and hydraulic stops.

Selon l'invention, le moteur électrique peut être de deux types, un premier qui est du type à champ radial, le moteur étant de large diamètre extérieur, le deuxième étant de type à champ axial, et étant de même diamètre intérieur, mais de plus grande longueur.According to the invention, the electric motor can be of two types, a first which is of the field type radial, the motor being of large external diameter, the second being of the axial field type, and being likewise inner diameter, but of greater length.

Liste des figuresList of Figures

L'invention et ses différentes caractéristiques techniques seront mieux comprises à la lecture de la description suivante, donnée à titre d'exemple, et illustrée de deux figures représentant respectivement :

  • figure 1, en coupe, une première réalisation du propulseur selon l'invention, équipé d'un moteur électrique axial ; et
  • figure 2, en coupe, une deuxième réalisation du propulseur selon l'invention, équipé d'un moteur électrique radial.
The invention and its various technical characteristics will be better understood on reading the following description, given by way of example, and illustrated by two figures representing respectively:
  • Figure 1, in section, a first embodiment of the propellant according to the invention, equipped with an axial electric motor; and
  • Figure 2, in section, a second embodiment of the propellant according to the invention, equipped with a radial electric motor.

Description détaillée de deux réalisations de l'inventionDetailed description of two realizations of the invention

La figure 1 représente le propulseur selon l'invention, équipé d'un moteur électrique à champ axial, c'est-à-dire avec une forme plutôt allongée autour de l'axe 1 du propulseur. A l'intérieur d'une nacelle 2 est donc monté tournant un arbre 3, au moyen de paliers-butées hydrauliques 4V et 4R, montés respectivement dans une partie avant 2V et une partie arrière 2R de la nacelle 2. Au niveau de l'extrémité avant 3V de l'arbre 3, c'est-à-dire en aval de la partie avant 2V de la nacelle 2, se trouve une chambre d'entrée 5 équipée de plusieurs ouïes 6 placées latéralement par rapport à l'axe 1 du propulseur. L'eau est donc aspirée par ces ouïes 6 pour pénétrer à l'entrée d'un ensemble tournant de propulsion supporté par l'arbre 3.Figure 1 shows the propellant according to the invention, equipped with an electric field motor axial, i.e. with a rather elongated shape around axis 1 of the propellant. Inside a nacelle 2 is therefore mounted rotating a shaft 3, by means 4V and 4R hydraulic thrust bearings, mounted respectively in a part before 2V and a part rear 2R of nacelle 2. At the end before 3V of shaft 3, i.e. downstream of the front part 2V of nacelle 2, there is a room input 5 equipped with several vents 6 placed laterally with respect to axis 1 of the propellant. The water is therefore sucked in by these vents 6 to penetrate the input of a supported propulsion rotating assembly by the tree 3.

Autour de ce dernier est fixée une vis hydraulique 7. A la sortie de cette dernière, la forme interne de la nacelle 2 s'élargit pour former un canal torique bombé autour de la partie arrière 2R de la nacelle 2. Dans la première partie qui s'évase du canal bombé, se trouvent les aubes 8 d'une pompe hélico-axiale, solidaire de l'arbre 3. Elles sont suivies, dans la deuxième partie qui se ressert du canal bombé, par des redresseurs 9 fixés à la nacelle 2. Le circuit hydraulique du propulseur se termine par une tuyère 10 fixée à la nacelle 2.Around the latter is fixed a screw hydraulic 7. On leaving the latter, the shape internal of nacelle 2 widens to form a channel rounded O-ring around the rear part 2R of the nacelle 2. In the first part which flares out of the canal domed, are the blades 8 of a pump helical-axial, integral with the shaft 3. They are followed, in the second part which draws on the curved channel, by rectifiers 9 fixed to the nacelle 2. The hydraulic circuit of the thruster ends with a nozzle 10 fixed to the nacelle 2.

Le moteur électrique est du type immergé dans l'eau et est placé axialement autour de la vis hydraulique 7. Le stator 11S est solidaire de la nacelle 2, tandis que le rotor 11R est fixé autour de la vis hydraulique 7 et est donc intégré sur l'ensemble tournant de propulsion. Le stator 11S et le rotor 11R sont chemisés. Le moteur peut être soit synchrone, soit asynchrone.The electric motor is of the type immersed in water and is placed axially around the screw hydraulic 7. The stator 11S is integral with the nacelle 2, while the rotor 11R is fixed around the hydraulic screw 7 and is therefore integrated on the assembly propulsion turn. 11S stator and 11R rotor are jacketed. The motor can be either synchronous or asynchronous.

Les paliers-butées 4V et 4R sont du type hydraulique, plus précisément ils sont alimentés en permanence par de l'eau dans laquelle se trouve la nacelle, sous pression.4V and 4R thrust bearings are of the type hydraulic, more precisely they are supplied with permanently by water in which the nacelle, under pressure.

La figure 2 représente le propulseur selon l'invention dans une réalisation utilisant un moteur du type radial, c'est-à-dire que le champ électrique est radial. En conséquence, son diamètre extérieur est un peu plus important que celui du moteur axial utilisé dans la réalisation décrite à la figure 1. Par contre, sa longueur est plus courte.FIG. 2 represents the propellant according to the invention in an embodiment using an engine of the radial type, i.e. the electric field is radial. Consequently, its outside diameter is a little more important than that of the axial motor used in the embodiment described in FIG. 1. On the other hand, its length is shorter.

La nacelle 12 s'apparente à la nacelle 2 de la figure 1 et l'ensemble tournant de propulsion est quasiment identique. La vis, les aubes 8 de la pompe hélico-axiale, les redresseurs 9 et la tuyère 10, sont identiques. Il en est de même pour l'arbre 3 de l'ensemble tournant de propulsion qui est également monté tournant, par des paliers-butées 4V et 4R dans des parties respectives avant 12V et arrière 12R de la nacelle 12. Basket 12 is similar to basket 2 of Figure 1 and the rotating propulsion assembly is almost identical. The screw, the vanes 8 of the pump helical-axial, the rectifiers 9 and the nozzle 10, are identical. It is the same for tree 3 of the rotating propulsion assembly which is also rotatably mounted, by 4V and 4R thrust bearings in respective front 12V and rear 12R parts of the basket 12.

Par contre, le début du parcours hydraulique est un peu différent en ce sens que la chambre d'entrée 15 est un peu plus allongée, des ouïes 16 étant toutefois également placées latéralement.However, the start of the hydraulic journey is a little bit different in that the entry room 15 is a little more elongated, gills 16 being however also placed laterally.

Le moteur comprend donc un rotor 21R de forme discoïde fixé autour de la vis hydraulique 17. Il est placé entre les deux parties 21S du stator qui sont fixes par rapport à la nacelle 12.The motor therefore includes a shaped rotor 21R discoid fixed around the hydraulic screw 17. It is placed between the two parts 21S of the stator which are fixed relative to the nacelle 12.

Avantages du propulseur selon l'inventionAdvantages of the propellant according to the invention

Plusieurs avantages sont inhérents à la technique de propulsion par hydrojet. En effet, à puissance égale, un propulseur à hélice tourne environ à 150 tours/minute, tandis qu'un propulseur à hydrojet tourne environ à 600 tours/minute. La taille des moteurs étant inversement proportionnelle à la vitesse de rotation, le moteur, utilisé dans une technique hydrojet, est beaucoup plus compact que celui utilisé pour entraíner une hélice.Several advantages are inherent in the hydrojet propulsion technique. Indeed, at equal power, a propeller propeller rotates approximately at 150 rpm, while a hydrojet thruster turns at around 600 revolutions / minute. The size of motors being inversely proportional to speed of rotation, the motor, used in a technique hydrojet, is much more compact than the one used to drive a propeller.

Il est avantageux de coupler sur une même nacelle deux propulseurs, c'est-à-dire deux ensembles hydrojets. En effet, cela permet d'annuler le couple de torsions sur le système d'orientation de la nacelle si les deux groupes travaillent, l'un en rotation dextrogyre, et l'autre en rotation sénestrogyre, les deux couples s'annulant.It is advantageous to couple on the same nacelle two propellants, i.e. two sets waterjets. Indeed, this makes it possible to cancel the couple of twists on the nacelle orientation system if the two groups are working, one in rotation dextrorotatory, and the other in senestrogyrous rotation, the two couples canceling each other.

A grande vitesse, les propulseurs à hélice ont tendance à subir de la cavitation. Ce phénomène provoque du bruit et des risques d'endommagements au niveau des pales, contrairement au système de propulsion par hydrojet, qui ne cavite pas.At high speed, propeller thrusters tend to experience cavitation. This phenomenon causes noise and risk of damage to the blade level, unlike the propulsion by hydrojet, which does not cavitate.

L'utilisation de paliers-butées hydrauliques permet de ne pas utiliser de roulements à billes. Ceci renforce la résistance aux chocs, notamment aux chocs militaires.The use of hydraulic thrust bearings allows not to use ball bearings. This strengthens impact resistance, especially impact military.

Du point de vue de la discrétion acoustique, la propulsion par hydrojet présente de nombreux avantages. En effet, le type de pompe, la vitesse, le fait qu'elle soit gavée par une vis hydraulique et que l'écoulement de l'eau se fasse en canal confiné sont autant d'avantages par rapport à l'hélice qui tourne en milieu ouvert et à basse fréquence. Il en est de même pour l'utilisation de paliers-butées hydrauliques, en remplacement de roulements à billes de nature bruyante.From the point of view of acoustic discretion, the propulsion by hydrojet presents many benefits. In fact, the type of pump, the speed, the causes it to be force-fed with a hydraulic screw and the water flow takes place in a confined channel are as many advantages compared to the propeller which turns in open environment and at low frequency. It is the same for the use of hydraulic thrust bearings, in replacement of noisy ball bearings.

Le propulseur selon l'invention ne nécessite pas d'auxiliaire de ventilation, de lubrification ou de refroidissement. L'inversion de poussée se fait comme sur les hydrojets classiques avec un déflecteur concave, manoeuvré par un vérin.The propellant according to the invention does not require no ventilation, lubrication or cooling. The reverse thrust is done as on conventional hydrojets with a deflector concave, operated by a jack.

Le rendement d'une pompe hélico-axiale, utilisée dans le propulseur selon l'invention, associée à une vis hydraulique qui gave l'entrée de la pompe hélico-axiale, est de l'ordre de 75 %. On peut donc envisager une augmentation de 10 % sur le rendement global de propulsion par rapport à une hélice traditionnelle.The efficiency of a helical-axial pump, used in the propellant according to the invention, associated to a hydraulic screw which feeds the pump inlet helical-axial, is around 75%. So we can consider a 10% increase in yield overall propulsion compared to a propeller Traditional.

L'utilisation de la propulsion par hydrojet, et en particulier par double hydrojet, peut être intégrée harmonieusement dans les lignes d'eau et dans les formes de la carène du navire. Dans ce cas, elle se trouve donc bien moins en porte-à-faux qu'un propulseur à hélice, détaché de la coque du navire dans une nacelle monté en bout d'un mât. La traínée hydraulique et la vulnérabilité tactique s'en trouvent considérablement réduite.The use of propulsion by hydrojet, and in particular by double hydrojet, can be harmoniously integrated into water lines and into the shapes of the ship's hull. In this case, it therefore finds much less cantilevered than a propellant propeller, detached from the hull of the ship in a nacelle mounted at the end of a mast. Hydraulic drag and tactical vulnerability is found considerably reduced.

Il est possible d'utiliser quatre propulseurs selon l'invention sur une même plate-forme orientable, cette solution favorise une intégration dans la carène.Four thrusters can be used according to the invention on the same steerable platform, this solution promotes integration into the hull.

Claims (6)

  1. A ship's engine arranged in a pod and utilizing an electrical motor, comprising:
    a pod (2, 12);
    an electrical motor (11R, 11S, 21R, 21S) arranged in the pod;
    a rotating engine assembly (16, 17, 8, 9) driven by the rotor of the electrical motor, and
    an outlet nozzle (10), fixed to the rear of the pod (2, 12), downstream of the rotating engine assembly, and
    guide vanes (9) fixed to the pod (2, 12),
    characterized in that the rotating engine assembly is of the hydrojet type and comprises:
    a hydraulic screw (7, 17) and
    a helico-axial pump (8) placed downstream and integral with the hydraulic screw (7, 17) and
    in that the electrical motor is of the hollow type; that is, having a wide diameter rotor (11R, 21R) and a stator (11S, 21S) and hollow in its central part in order to surround the rotating engine assembly and so that the rotor (11R, 11S) is fixed around the rotating engine assembly.
  2. The ship's engine according to claim 1, characterized in that the rotor (11R, 11S) is placed around the hydraulic screw (7, 17).
  3. The ship's engine according to claim 1, characterized in that it comprises lateral intakes (6, 16) for entry of the water into the rotating engine assembly.
  4. The ship's engine according to claim 1, characterized in that the rotating engine assembly is mounted on a shaft (3) mounted rotationally in the pod (12) by means of hydraulic thrust bearings (4V, 4R).
  5. The ship's engine according to claim 1, characterized in that the electrical motor (11R, 11S) is of the axial field type.
  6. The ship's engine according to claim 1, characterized in that the electrical motor (21R, 21S) is of the radial field type.
EP02740856A 2001-06-06 2002-06-04 Ship pod-mounted hydrojet propeller unit driven by a hollow electric motor Expired - Lifetime EP1401705B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0107371A FR2825679B1 (en) 2001-06-06 2001-06-06 HYDROJET NACELLE SHIP PROPELLER DRIVEN BY A HOLLOW ELECTRIC MOTOR
FR0107371 2001-06-06
PCT/FR2002/001875 WO2002098731A1 (en) 2001-06-06 2002-06-04 Ship pod-mounted hydrojet propeller unit driven by a hollow electric motor

Publications (2)

Publication Number Publication Date
EP1401705A1 EP1401705A1 (en) 2004-03-31
EP1401705B1 true EP1401705B1 (en) 2004-10-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02740856A Expired - Lifetime EP1401705B1 (en) 2001-06-06 2002-06-04 Ship pod-mounted hydrojet propeller unit driven by a hollow electric motor

Country Status (10)

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US (1) US20040203298A1 (en)
EP (1) EP1401705B1 (en)
JP (1) JP2004533363A (en)
AT (1) ATE278606T1 (en)
BR (1) BR0210065A (en)
CA (1) CA2449123A1 (en)
DE (1) DE60201541D1 (en)
FR (1) FR2825679B1 (en)
NO (1) NO20035445D0 (en)
WO (1) WO2002098731A1 (en)

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Also Published As

Publication number Publication date
CA2449123A1 (en) 2002-12-12
EP1401705A1 (en) 2004-03-31
NO20035445D0 (en) 2003-12-05
WO2002098731A1 (en) 2002-12-12
US20040203298A1 (en) 2004-10-14
ATE278606T1 (en) 2004-10-15
DE60201541D1 (en) 2004-11-11
FR2825679A1 (en) 2002-12-13
BR0210065A (en) 2004-12-21
JP2004533363A (en) 2004-11-04
FR2825679B1 (en) 2003-09-19

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