Device for generating a fluid flow, having a membrane

Abstract

The invention relates to a device for generating a fluid flow (100) extending in a longitudinal direction (L), comprising: - a frame, - at least one membrane arranged to cause a fluid to move, - at least one actuator that causes the at least one membrane to move, or is actuated by the movement of the at least one membrane, characterised in that: - the at least one actuator performs a rotational movement, - the device additionally comprises a mechanical rotational / linear conversion system between the at least one actuator and the at least one membrane.

Description

MEMBRANE FLUID FLOW GENERATING DEVICE

[0001] The present invention relates to a membrane actuator. The present invention relates in particular to a device for generating fluid flow, preferably hydraulic, for example a hydraulic thruster, preferably intended for boats or ships, a pump, a fan, a compressor, a mixer, or a hydrogenerator. The device comprises at least one membrane, at least one actuator whose movable part performs a rotational movement, at least one rotary / linear mechanical conversion system transforming a rotational movement into a translational movement arranged between F at least one actuator and F at least one membrane so as to cause at least one part of said membrane to perform an alternating linear translation.

[0002] The invention relates more particularly to a hydraulic propulsion device comprising a rotary motor and at least one 2D or 3D membrane, of the flat or planar type, of the cylindrical type for example discoidal or ovoid, of the polygonal type for example rectangular or trapezoidal, and / or at least one 3D membrane of the tubular type. The at least one membrane or the wall of the at least one membrane may have a constant or variable thickness along the at least one membrane or along the wall of the at least one membrane.

[0003] Fluid flow generating devices are known, in particular hydraulic or aeraulic flow generating devices.

[0004] However, he is keen to offer a simple, economical, ecological solution, allowing adjustment of the power and / or flow rate and / or pressure, and offering reduced space requirements. SUBJECT OF THE INVENTION

[0005] To this end, and according to a first aspect, the invention proposes a fluid flow generating device arranged to move a fluid in a direction of movement, for example of the device or of the fluid, the device comprising: - a frame, - at least one membrane arranged to set the fluid in motion, - at least one actuator setting the at least one membrane in motion or being actuated by the movement of the at least one membrane, characterized in that: - the at least one actuator performs a rotary movement, - the device further comprises at least one rotary / linear mechanical conversion system arranged between the at least one actuator and the at least one membrane.

[0006] The fluid flow generating device according to the invention has the advantages of offering a reduced footprint, and of allowing a high-frequency back-and-forth movement. This arrangement also makes it possible to offer a fluid flow generating device offering a low manufacturing and maintenance cost.

[0007] For the above and / or for the remainder of the description, the following terms are understood to mean: - membrane, a part comprising at least one flexible or deformable part arranged to produce a wave; - flange, a wall facing a membrane. Each flange cooperates with at least one membrane in order to locally pressurize the fluid present in order to locally produce an increase in flow rate and / or pressure relative to the surrounding environment.

[0008] Preferably the fluid set in motion is air or a liquid, preferably water.

[0009] Preferably, the device comprises at least one flange and the at least one membrane is arranged opposite the at least one flange and arranged to set the fluid in motion.

[0010] Preferably, each flange extends substantially parallel to the surface of the facing membrane. According to one embodiment, each flange is arranged at a longitudinal end of the frame or the actuator. In a combined or alternative manner, each flange is positioned transversely relative to a longitudinal direction of the device or the direction of movement or corresponding to the flow of the fluidic flow, in particular hydraulic.

[0011] Each flange may be rigid, or flexible having a certain elasticity. Preferably, each flange has a higher rigidity, or a lower capacity to bend or deform elastically, compared to the at least one membrane. It may have various shapes, for example rectangular, triangular, trapezoidal, cylindrical, circular, elliptical, discoidal, tubular. It may include hollows, asperities or lips allowing a pressure build-up. Each flange is composed or is made of one or more specific materials, for example marine, food, biocompatible, or hydrocarbon. For example, the flange comprises one or more of the following materials: PBT, ASA, ABS, PVC, PTFE, PEEK, PA, PET, PE, Aluminum, Stainless steel, elastomer.

[0012] According to a particular embodiment, a flange may be a hull element of a nautical vehicle, for example a hull element of a boat.

[0013] Preferably, the at least one flange may also be convergent and divergent (move closer to or further away from the flange) to increase the pressure at the expense of the flow rate, and vice versa.

[0014] Preferably, each membrane may have various shapes, for example polygonal, rectangular, triangular, trapezoidal, cylindrical, circular, elliptical, discoidal, tubular. According to alternative embodiments, the at least one membrane may have a circumference with at least one straight portion and at least one curvilinear portion.

[0015] Each membrane is composed of or is made of one or more specific materials, for example marine, food, biocompatible, or hydrocarbon. For example, each membrane includes one or more of the following materials: elastomer, rubber, polyurethane, TPU, EPDM, silicone, PTFE, nitrile, or even plastics, or metals.

[0016] Preferably, the device may comprise several membranes. This feature makes it possible to increase the thrust or speed generated by the device without increasing the dimensions of this device. In the case where these membranes operate in phase opposition, this also makes it possible to counteract imbalances.

[0017] Each membrane is arranged to be moved in translation in a rectilinear and reciprocating manner. Each membrane is designed to oscillate or undulate with a predetermined frequency and amplitude. According to one embodiment, the at least one membrane is set in motion by at least one element connected to one end of the at least one membrane. According to another embodiment, the at least one membrane is set in motion by at least one element connected to a peripheral edge of the at least one membrane. According to yet another embodiment, the at least one membrane is set in motion by at least one element connected to an inner peripheral surface of the at least one membrane, the at least one membrane being of the cylindrical or polygonal type having a closed peripheral surface.

[0018] According to one embodiment, the at least one membrane extends substantially parallel to the direction of movement of the device or the fluid. According to another embodiment, the at least one membrane extends transversely to the direction of movement of the device or the fluid. Depending on the mounting, settings and use of the device, the position of the at least one membrane may vary by a few degrees.

[0019] Preferably, the ripple frequency of the at least one membrane is greater than 0 hertz and less than 1000 hertz, preferably greater than 0 hertz and less than 200 hertz. According to one embodiment, the peak-peak ripple amplitude of a membrane is less than half the length (longitudinal or diameter) of this membrane, and preferably less than one-fifth of the length of this membrane. For example, it is advantageous to select a ripple frequency substantially equal, to within a few hertz, to a natural frequency or to a beat frequency of the membrane or of a actuator in order to transmit optimal power to the fluid as it moves through the device, or to reduce the vibrations produced when it is in operation.

[0020] When at least one membrane, arranged opposite at least one flange, is made to oscillate or undulate by at least one actuator, a progressive wave is produced and propagates along said membrane. This progressive wave then causes a displacement of the volume of fluid located between said membrane and the at least one flange, with a speed and direction substantially identical to those of the fluid propagating through the membrane. The at least one flange makes it possible to increase the pressure differential created by the undulation of the membrane, to generate propulsion.

[0021] According to a first family of embodiments, the at least one membrane extends parallel to the direction of movement of the device or the fluid. The at least one membrane may be a surface element, for example a sheet or a flexible or supple wall. Preferably, the at least one membrane is actuated at or by one of its ends so as to cause a ripple propagating along its longitudinal direction to the opposite end. In operation, the end of the at least one membrane is actuated and set in motion in an alternating rectilinear translation so as to initiate a ripple of the at least one membrane. Preferably, said ripple setting comprises a movement of at least one end of the membrane by at least one actuator. Preferably, the at least one membrane has a generally rectangular or trapezoidal shape.Preferably, the at least one membrane comprises at least one polygonal membrane, preferably rectangular, or triangular or trapezoidal.

[0022] Preferably, the at least one membrane has an upstream edge and a downstream edge. According to one embodiment, the number of wavelengths between the upstream edge and the downstream edge is less than five undulations. For example, the number of wavelengths is less than one undulation in the case of stiff membranes allowing higher hydraulic powers than those of flexible membranes.

[0023] Preferably, if the device comprises several membranes, these can be superimposed and spaced apart. According to an alternative embodiment, the device comprises two flanges spaced apart from each other and the two membranes are arranged between the two flanges.

[0024] According to one embodiment, the at least one flange is arranged substantially horizontally and its longitudinal length is substantially parallel to the direction of movement in operation of the device. According to another embodiment, the at least one flange is arranged substantially vertically and its longitudinal length is substantially perpendicular to the direction of movement of the device or fluid in operation of the device.

[0025] According to a second family of embodiments, the at least one membrane comprises at least one membrane extending transversely relative to the direction of movement of the device or the fluid. The at least one membrane may be a surface element, for example a sheet or a flexible wall. According to one embodiment, the at least one membrane has an outer face oriented towards the outside of the device. Preferably, the at least one membrane is actuated via or by the outer peripheral edge of said membrane so as to cause a wave propagating from the outside towards the inside of said membrane. According to one embodiment, the at least one membrane comprises at least one membrane having a cylindrical shape, preferably discoidal or ovoid. Preferably, the at least one membrane comprises a central opening. Preferably, the at least one membrane comprises at least one discoidal membrane.

[0026] Preferably, the at least one membrane extending transversely is arranged opposite the at least one flange. Preferably, the at least one membrane has an outer face oriented towards the outside of the device. Advantageously, the device may comprise at least two membranes spaced apart and preferably arranged coaxially.

[0027] According to a third family of embodiments, the at least one membrane comprises a tubular membrane extending parallel to the direction of movement of the device or the fluid. Preferably, the at least one membrane comprises a tubular membrane whose longitudinal axis extends parallel along the longitudinal direction of the device or the at least one actuator when they are predominantly immersed in operation. Preferably, the at least one membrane is actuated via the internal or external surface and via one end of said membrane so as to cause a ripple propagating along its longitudinal direction to the opposite end. The actuation of the membrane is carried out in a linear and radial direction.

[0028] According to any embodiment of the membrane, the at least one actuator is selected from the following list of actuators: a turbine, or a heat engine, preferably a piston engine, or an electric motor, or a mechanical motor, or a combination thereof. The at least one actuator comprises a rotary actuator.

[0029] For example : - the turbine is of the gas or combustion type, - the heat engine is of the internal combustion type, - the electric motor is of the electromagnetic or piezoelectric type, for example a torque motor, - the mechanical motor is of the manual type, for example a pedal drive.

[0030] According to any embodiment of the membrane and / or according to any embodiment of the at least one actuator, the at least one conversion system is chosen from the following list of systems: a connecting rod / crank system, or a crankshaft system, or a slide / crank system, or a connecting rod system coupled to a chain or a belt, or a cam system, for example a camshaft system, or a pinion / rack system or a wheel and worm system, or a crown and planetary pinion system or a combination thereof.

[0031] According to alternative embodiments, the device may further comprise an offset system, for example axial and / or longitudinal, between the at least one actuator and the at least one membrane. Preferably, the offset system is arranged between the at least one actuator and the at least one rotary / linear mechanical conversion system. For example, the offset system may comprise a chain, or a shaft, or at least one toothed wheel, or an angle transmission, for example gears, in particular bevel gears, or pivot, non-parallel gears and racks, or cardan shaft, or a combination thereof. The offset system makes it possible to space the at least one actuator from the at least one membrane.

[0032] One or more offset systems provide several advantages: - move the actuator out of the fluid medium, in particular out of water in the case of a nautical thruster, thus reducing the sealing constraints linked to the actuator, - reduce the clutter around at least one flange and at least one membrane, - reduce water and / or air resistance, - facilitate the assembly or maintenance of the system.

[0033] Preferably, the flow generating device further comprises sealing means connected to the at least one actuator and / or to the at least one rotary / linear mechanical conversion system and / or to the at least one membrane. The device comprises sealing means, for example around the rotation shaft of each actuator, and / or around each offset shaft, and / or around the actuating or pushing rods. The sealing means are chosen from the following list of means: scraper seal, buffer seal, single-acting seal, double-acting seal, lip seal(s) (or oil seal), spring seal, O-ring, bellows, or a combination thereof. According to one embodiment, the sealing means are located opposite or just before the at least one membrane, to seal the entire mechanical system.

[0034] According to other embodiment variants, the device further comprises at least one system for reducing or multiplying the rotational speed or the force F of at least one actuator and / or the at least one rotary / linear mechanical conversion system, and / or at least one system for reducing or multiplying the oscillation frequency of the at least one membrane. Preferably, the device further comprises at least one system for reducing or multiplying the rotational speed or the force of a shaft. For example, the at least one reduction system is connected to the rotation shaft of the at least one actuator, said system comprising at least one toothed wheel. This reduction system can be arranged between the at least one actuator and the at least one rotary / linear mechanical conversion system.According to one embodiment, the reduction system can be arranged upstream and downstream of the at least one rotary / linear mechanical conversion system.

[0035] According to different embodiments which can be combined: - the reduction system can be rotary or linear, - the reduction system can be directly incorporated into a rotary to linear motion conversion system, - the reduction system can also be incorporated into an angle transmission system.

[0036] Preferably, the reduction system is chosen from the following list of reduction systems: a set of wheels and / or toothed crowns forming a gear train, for example an epicyclic gear train, a planetary reducer, a set of toothed wheels and racks, or a combination thereof.

[0037] Preferably, the device comprises at least one angle transmission, which can be chosen from the following list of transmissions: bevel gears, a set of gears and racks, said racks being arranged non-parallel to each other, a cardan-type assembly, or a combination thereof.

[0038] According to further optional variants which can also be combined with the previous embodiments, the device can further comprise a system for adjusting the stroke of the linear actuation of the at least one membrane. This feature makes it possible in particular to adjust the amplitude and the oscillation frequency of the at least one membrane.

[0039] For example, the stroke adjustment system is selected from the following list of systems: a worm screw, a spring, a pivot, or a cylinder, for example pneumatic or hydraulic, or a wheel or pulley whose periphery can extend radially, or a combination of these.

[0040] Preferably, this feature allows the amplitude to be adjusted depending on or independently of the actuation frequency in operation or not.

[0041] These different systems allow, in the case of a mechanical conversion system of the connecting rod / crank type, to modify the position of the attachment point of the connecting rod on the crank so as to increase or reduce the distance between the center of rotation of the crank and the hook of the connecting rod.

[0042] The same principles can be used for connecting rod-chain / belt and slide-crank systems.

[0043] For camshaft systems, a system for enlarging or decreasing the size of the cams by means of protruding rods, for example radially.

[0044] Preferably, all actuator systems, rotary / linear mechanical conversion systems, offset systems, systems for reducing or multiplying the rotational speed or force of a shaft, stroke adjustment systems, angle transmission systems are combinable with each other and combinable with all types of membranes and all forms of flanges.

[0045] According to one embodiment, the device comprises at least two conversion systems and at least two membranes, the systems being arranged to undulate the membranes in phase, out of phase, or in phase opposition. According to an alternative embodiment, the device comprises at least one conversion system having two hooks, each arranged to connect at least one membrane.

[0046] According to one embodiment, the device comprises one or more actuator(s), at least two membranes, at least one rotary / linear mechanical conversion system, each system being connected to a membrane, the systems being arranged to undulate the membranes in phase, or out of phase, or in phase opposition. Preferably, the device comprises at least two rotary / linear mechanical conversion systems. According to an alternative embodiment, the device comprises a rotary / linear mechanical conversion system comprising two conversion system sub-elements, each sub-element being a part of a conversion system. For example, the mechanical conversion system is a connecting rod / crank system comprising a crankshaft comprising at least two cranks and two connecting rods, each connecting rod being arranged to set in motion only one of the two membranes.

[0047] According to a particular embodiment, at least two membranes undulate, thanks to at least one actuator, with a phase shift of an angle chosen from a group comprising: an angle substantially equal to 0°, an angle substantially equal to 90°, an angle substantially equal to 180°, an angle substantially equal to 270°, and an angle substantially equal to 360° divided by the number of membranes in said chamber. For example, a phase shift angle substantially equal to another is an angle whose value is equal to the value of this other angle with an accuracy of plus or minus 10°, and preferably, with an accuracy of plus or minus 5°. Two membranes which undulate with a phase shift of an angle substantially equal to 180°, are said to be undulating in phase opposition. When two membranes undulate in phase opposition phase, this makes it possible to provide greater thrust, and to compensate for imbalances due to the displacement of masses of liquid by these membranes, and to the masses of the moving parts of the actuator(s), since the first membrane undulates in a first direction and the second membrane undulates in a second direction, opposite to the first direction.

[0048] Furthermore, phase opposition operation allows occlusion to be produced between the membranes, which increases the performance of the device.

[0049] According to one embodiment, the device comprises a single actuator, at least two membranes and in which the at least one rotary / linear mechanical conversion system comprises at least two connecting rod / crank systems, or cam systems. Preferably, the at least two membranes are of the rectangular or discoidal type.

[0050] According to an alternative embodiment, the actuator is an electric actuator, preferably an electric motor, preferably a central rotor motor or a peripheral rotor motor such as a torque motor. The device comprises a crankshaft-type shaft connected to the rotation shaft of the actuator. The crankshaft-type shaft comprises at least two cranks, each crank being connected to a connecting rod so as to produce the at least two connecting rod / crank systems. Preferably, the device comprises at least two actuating or pushing rods, each rod connecting one connecting rod end to a membrane.

[0051] According to one embodiment, the device in which the at least one rotary / linear mechanical conversion system comprises at least one connecting rod / crank system, at least one push rod, each connecting rod being connected to a push rod, each push rod being connected to the at least one membrane extending parallel to the direction of movement, or being connected to the at least one membrane extending transversely to the direction of movement. This embodiment makes it possible in particular to reduce the number of parts of the device. Preferably, the at least one actuator is a heat engine, preferably comprising a connecting rod / crank / piston system.

[0052] According to one embodiment, the device comprises at least one longitudinal offset shaft, each offset shaft being connected to a rotation shaft of an actuator via a proximal end of the offset shaft, device in which the at least one rotary / linear mechanical conversion system comprises at least one connecting rod / crank system or a slide / crank system or a cam system or a crankshaft system, or a crown and planetary pinion system, the at least one membrane extending transversely to the direction of movement, each connecting rod / crank system or slide / crank system or cam system or crankshaft system or a crown and planetary pinion system being connected on the one hand to an offset shaft, or preferably via a distal end of the offset shaft, and on the other hand to a membrane. Preferably, the at least one membrane is a discoidal membrane.This embodiment makes it possible, for example, to produce a hydraulic thruster having a remote motor, designed to be placed outside the water during operation.

[0053] According to an alternative embodiment, the device comprises at least one actuator, at least one longitudinal offset shaft, each offset shaft being connected to a rotation shaft of an actuator via a proximal end of the offset shaft, device in which: the at least one rotary / linear mechanical conversion system comprises at least one connecting rod / crank system or a slide / crank system, or a cam system or a crankshaft system, at least one membrane extending parallel to the direction of movement, each connecting rod / crank system or slide / crank system or cam system or crankshaft system being connected on the one hand to an offset shaft via a distal end of the offset shaft and on the other hand to a membrane.

[0054] According to yet another embodiment, the device in which the at least one rotary / linear mechanical conversion system comprises at least two pulleys or toothed wheels, one of which is connected to the rotation shaft of the at least one actuator, at least one flexible link connecting in rotation the at least two pulleys or toothed wheels, a lever arm having a rotation shaft connected to the frame of the device, the lever arm being able to pivot around this shaft, a lever connecting rod connected at a first end to the flexible link and at a second end to the lever arm, so as to pivot the lever arm via the lever connecting rod set in motion by the flexible link, the device further comprising a rod for actuating the at least one membrane, and a rod connecting rod connected at a first end to the lever arm and at a second end to the actuating rod.

[0055] According to one embodiment, the device in which the at least one rotary / linear mechanical conversion system comprises a cam conversion system, and the at least one membrane is a tubular membrane, the axis of the at least one actuator and / or the axis of the at least one rotary / linear mechanical conversion system being coaxial with the axis of the tubular membrane, the cam system comprising a disc comprising a groove forming a closed and continuous path along a predetermined trajectory, said system further comprising at least one rod, preferably at least three rods, extending radially, each distal end of which is connected to or in contact with a radial thrust piece itself in contact with a portion of the circumference of said membrane, each rod having a shape, for example a finger, arranged to cooperate with the groove.For example, the radial thrust piece is in contact with a portion of the inner or outer circumference of said membrane.

[0056] According to yet another embodiment, a device is provided in which - the at least one rotary / linear mechanical conversion system comprises at least one cam conversion system, and - the at least one membrane is a tubular membrane, the axis of the at least one actuator and / or the axis of the at least one rotary / linear mechanical conversion system being coaxial with the axis of the tubular membrane, the cam system having a surface, preferably a peripheral surface, comprising a succession of concave and convex portions, said system further comprising at least one radially extending rod, each proximal end of which is connected or in contact with said surface, each rod being connected or in contact with a portion of the circumference of said membrane.

[0057] For example, each rod includes a member projecting into the groove. Preferably, this member has a ball-shaped end to cooperate with the groove. For example, the groove has a notched, sinusoidal, or cam-shaped trajectory, so that each rod translates with a reciprocating movement.

[0058] According to an alternative embodiment, the device in which the at least one rotary / linear mechanical conversion system comprises at least one connecting rod / crank system connected to a wheel / rack system, and the at least one membrane is at least one tubular membrane, the axis of the at least one actuator being spaced, preferably parallel, from the axis of the tubular membrane, the latter axis corresponding to the axis of the wheel, the wheel / rack system being arranged in the center, or on the periphery, of the tubular membrane, one end of each rack being connected or in contact with a radial thrust piece itself in contact with a portion of the circumference, for example internal or external, of said membrane, one end, called the motor, of the connecting rod being connected to an eccentric connected at a distance from the axis on the shaft of the at least one actuator, the crank being connected in rotation with the wheel, so that the rotation of the wheel,driven via the connecting rod / crank system, moves the racks which exert a radial force on the tubular membrane.

[0059] According to yet another embodiment, the device comprises one or more membranes arranged to operate in phase or in phase opposition, preferably comprising positioning means.

[0060] According to a second aspect, the invention proposes a hydraulic thruster for the propulsion of nautical craft characterized in that it comprises a flow generating device according to one or more of the preceding characteristics. The thruster thus proposed is both compact and efficient, without propeller or blades.

[0061] Preferably, the hydraulic thruster is a nautical thruster. The nautical thruster is arranged to move a nautical vehicle of the floating, foil or submersible vehicle type adapted to move on a liquid and / or in this liquid, in particular water. Such a vehicle may be partially or totally submerged in the liquid. This vehicle may be piloted by any means on board, remotely, or autonomously.

[0062] According to a third aspect, the invention provides a hydrogenerator characterized in that it comprises a flow generating device according to one or more of the preceding characteristics. The flow generating device is in this aspect a generating device of electrical energy from a flow, or flow recovery. Preferably, the device is a hydraulic flow generating device.

[0063] According to a fourth aspect, the invention provides a pump characterized in that it comprises a flow generating device according to one or more of the preceding characteristics. For example, the pump is a hydraulic pump, or a transfer pump, or a metering pump, or a mixing pump, or a flow pump, or a pressure pump.

[0064] According to a fifth aspect, the invention proposes a compressor characterized in that it comprises a flow generating device according to one or more of the preceding characteristics.

[0065] According to a sixth aspect, the invention provides a fan characterized in that it comprises a flow generating device according to one or more of the preceding characteristics. BRIEF DESCRIPTION OF THE FIGURES

[0066] Other characteristics and advantages of the invention will emerge from the detailed description of the invention which follows with reference to the appended figures and in which: - figure 1 is a schematic representation of the main parts that comprise a fluid flow generating device according to one embodiment; - Figure 2 represents a perspective example of a rotary / linear mechanical conversion system of the crank / slide type; - Figure 3 is a schematic side view of a rotary / linear mechanical conversion system comprising pulleys connected by a chain which operates a connecting rod; - Figure 4 comprises three views of a hydraulic thruster according to a first embodiment, in which, Figure 4a is a side view of said thruster, Figure 4b is a rear view of said thruster, and Figure 4c is a perspective and transparent view of said thruster; - Figure 5 comprises three views of a hydraulic thruster according to a second embodiment, in which, Figure 5a is a side view of said thruster, Figure 5b is a rear view of said thruster, and Figure 5c is a perspective and transparent view of said thruster; - Figure 6 comprises three views of a hydraulic thruster according to a third embodiment, in which, Figure 6a is a side view of said thruster, Figure 6b is a rear view of said thruster, and Figure 6c is a perspective and transparent view of said thruster; - Figure 7 comprises two views of a hydraulic thruster according to a fourth embodiment, in which, Figure 7a is a side view of said thruster, Figure 7b is a front view of said thruster; - Figure 8 comprises three views of a hydraulic thruster according to a fifth embodiment, in which, Figure 8a is a side view of said thruster, Figure 8b is a front view of said thruster, and Figure 8c is a perspective and transparent view of said thruster; - Figure 9 comprises three views of a hydraulic thruster according to a sixth embodiment, in which, Figure 9a is a side view of said thruster, Figure 9b is a front view of said thruster, and Figure 9c is a perspective and transparent view of said thruster; - Figure 10 comprises three views of a hydraulic thruster according to a seventh embodiment, in which, Figure 10a is a side view of said thruster, Figure 10b is a front view of said thruster, and Figure 10c is a perspective and transparent view of said thruster; - Figure 11 comprises three views of a hydraulic thruster according to an eighth embodiment, in which, Figure 11a is a side view of said thruster, Figure 11b is a perspective view of said thruster, and Figure 11c is a perspective and transparent view of said thruster; - Figure 12 comprises four views of a hydraulic thruster according to a ninth embodiment, in which, Figure 12a is a side view of said thruster, Figure 12b is a rear view of said thruster, and Figure 12c is a perspective and transparent view of said thruster, Figure 12d is a zoom of a rotary / linear mechanical conversion system of the cam type and a tubular membrane seen in perspective in partial transparency of said thruster; - figure 13 comprises two views of a hydraulic thruster according to a tenth embodiment, in which, figure 13a is a side and sectional view of said thruster, figure 13b is a sectional and perspective view of said thruster; - figure 14 comprises three views of a hydraulic thruster according to an eleventh embodiment, in which, figure 14a is a side view and in partial transparency of said thruster, figure 14b is a front view of said thruster, and figure 14c is a perspective view and in transparency of said thruster; - Figure 15 comprises three views of a hydraulic thruster according to a twelfth embodiment, in which, Figure 15a is a perspective view of said thruster, Figure 15b is a zoom of the conversion system and the membranes of said thruster, and Figure 15c is a perspective view of the membranes and a part of the conversion system of said thruster of said thruster; - Figure 16 comprises four views of a hydraulic thruster according to a thirteenth embodiment, in which, Figure 16a is a perspective view of said thruster, Figure 16b is a zoom of the conversion system of said thruster, Figure 16c is a top view of an element of the conversion system, and Figure 16d is a sectional view of said element of the conversion system; - Figure 17 comprises two perspective views of a hydraulic thruster according to a fourteenth embodiment, in which, Figure 17a is a perspective view of said thruster provided with a cover, and Figure 17b is a perspective view of said thruster without a cover; - Figure 18 comprises four views of a hydraulic thruster according to a fifteenth embodiment, in which, Figure 18a is a perspective view of said thruster, Figure 18b is a front view of said thruster showing a conversion system in a position called bottom dead center, Figure 18c is a front view of said thruster showing the conversion system in a position called top dead center, and Figure 18d is a profile view of said thruster; - figure 19 comprises two views of a hydraulic thruster according to a sixteenth embodiment, in which, figure 19a is a perspective view of said thruster, figure 19b is a profile view of said thruster showing the conversion system in a so-called top dead center position; - Figure 20 includes a view of a hydraulic thruster according to a seventeenth embodiment, in which the thruster comprises a cam system and a membrane.

[0067] For clarity, identical or similar elements of the different embodiments are identified by identical reference signs throughout the figures. DETAILED DESCRIPTION OF THE INVENTION

[0068] In relation to Figure 1, there is illustrated the main elements of a hydraulic thruster arranged to set the surrounding fluid in motion in a direction of movement D, the thruster comprising:

[0069] - a frame 1,

[0070] - at least one rotary engine 10,

[0071] - at least one membrane 11 arranged to set a fluid in motion,

[0072] - a rotary / linear mechanical conversion system 12 arranged between the at least one rotary motor 10 and the at least one membrane 11,

[0073] - linear guide elements 13 and gripping elements 14 between the conversion system and the at least one membrane.

[0074] According to exemplary embodiments of the conversion system, it is provided: - a connecting rod / crank system, - a slide / crank system 22, see figure 2, - a connecting rod / crank system 32, the crank function of which is performed by a set of pulleys connected by a flexible link of the belt or chain type, see figure 3, - a cam type system(s), for example a camshaft, - or a combination of these.

[0075] Optionally, the device may include a system 15 for reducing or multiplying the rotation speed of the rotation shaft of the motor 10. This system may be placed upstream or downstream of the rotary / linear mechanical conversion system.

[0076] With reference to Figure 4, in particular Figures 4a, 4b and 4c, the hydraulic thruster comprises: - a motor 40 whose rotation shaft is parallel to the direction of movement L of the fluid to be moved, the motor being designed to remain out of water during operation, - two rectangular membranes 41a, 41b arranged at rest as in operation opposite each other, and are arranged opposite the engine relative to the propeller frame, the two membranes being arranged under the fascia 47 opposite the latter, - two connecting rod / crank systems 42, or crankshaft / connecting rods, each system being connected to a membrane via an offset shaft 46a, 46b, each connecting rod 42a, 42b of the systems being set in motion by a crankshaft type shaft 48, which is connected to one end of the engine shaft.

[0077] Preferably, this device comprises a crankshaft provided with two cranks, two connecting rods 42a, 42b each connected to a crank, two offset shafts 46a, 46b. According to the embodiment shown, the mechanical conversion systems are arranged one behind the other. The cranks are arranged so as to actuate the membranes in phase opposition, see crankshaft in Figure 4.

[0078] In operation, the rotation of the motor shaft causes the vertical translation back and forth of the offset shafts 46a, 46b. The membranes 41a, 41b are respectively connected to the offset shafts 46a, 46b by means of a hooking or gripping element 44a, 44b. Each hooking or gripping element 44a, 44b is arranged at an end called the upstream end of each membrane. The alternating translation of the upstream end of each membrane causes an undulation of the latter to move the flow in a direction and sense represented by the arrow D, and thus achieve propulsion.

[0079] According to an alternative embodiment described by its differences to the first embodiment and with reference to figure 5, in particular figures 5a, 5b and 5c, the hydraulic thruster comprises: - a motor 50 whose rotation shaft is arranged vertically and substantially perpendicular to the direction of movement of the fluid, this shaft is extended by an offset shaft 56, - a rectangular membrane 51 opposite a flange 57, - a bevel gear system 58 with bevel teeth, comprising two bevel wheels, one wheel with a vertical axis and one wheel with a horizontal axis, arranged at the end of the offset shaft 56, and - a connecting rod / crank system 52 in order to set said membrane 51 in alternating translational movement and achieve propulsion.

[0080] According to another variant embodiment described by its differences to the first embodiment and with reference to figure 6, in particular figures 6a, 6b and 6c, the hydraulic thruster comprises: - a motor 60 whose rotation shaft is parallel to and in the direction of flow of the fluid to be moved, the motor being designed to remain out of water during operation, - a rectangular membrane 61, arranged between two flanges 67a, 67b and opposite the engine relative to the propeller frame, - a slide / crank system 62, connected to the motor shaft - an offset shaft 66 arranged between the slide / crank system and the membrane.

[0081] According to a fourth embodiment, and with reference to figure 7, in particular to figures 7a and 7b, the hydraulic thruster comprises: - a motor 70 whose rotation shaft is parallel to the direction of flow of the fluid to be moved and offset laterally, the motor being designed to remain out of water during operation, - a rectangular membrane 71, arranged opposite a flange 77, - two pulleys or toothed wheels 72a, 72b, one of which is connected to the rotation of the motor shaft, at least one flexible link 73 connecting in rotation the two pulleys or toothed wheels, a lever arm 75 having a rotation shaft connected to the frame of the device, the lever arm being able to pivot around this shaft, a lever connecting rod 753 connected to a first end of the flexible link and to a second end to the lever arm, so as to pivot the lever arm by means of the lever connecting rod 753 set in motion by the flexible link, the device further comprising an actuating rod 74 of the at least one membrane 71, and a rod connecting rod 754 connected at a first end to the lever arm and at a second end to the actuating rod 74.

[0082] According to an alternative embodiment described by its differences to the first embodiment and with reference to figure 8, in particular figures 8a, 8b and 8c, and the hydraulic thruster comprises: - a motor 80 whose rotation shaft is parallel to and in the direction of flow of the fluid to be moved, the motor being designed to remain submerged in water during operation, - two rectangular membranes 81a, 81b, each arranged opposite an external wall forming a flange 87a, 87b of the device, and - a double connecting rod / crank system 82 of the type in figure 4.

[0083] According to an alternative embodiment described by its differences to the first embodiment and with reference to figure 9, in particular figures 9a, 9b and 9c, the hydraulic thruster comprises: - a 90 motor whose rotation shaft is parallel to and in the direction of flow of the fluid to be moved, the motor being designed to remain submerged in water during operation, - three rectangular membranes 91a, 91b, 91c, each arranged opposite an outer wall forming a flange 97a, 97b, 97c of the device, and - a connecting rod / crank system 92 of the type shown in figure 4.

[0084] Preferably, and in a manner that can be combined with the other embodiments, the motor 90 can be divided into 3 single-phase motors, each powered by one phase of a three-phase network.

[0085] With reference to Figure 10, in particular Figures 10a, 10b and 10c, the hydraulic thruster comprises: - a motor 100 whose shaft is arranged vertically and substantially perpendicular to the direction of movement of the fluid, this shaft is extended by an offset shaft 106, - a discoidal membrane 101 arranged transversely to the direction of flow and opposite a non-visible flange, - a toothed angle transmission system and a connecting rod / crank system 102 so as to set the discoidal membrane in motion in a direction parallel to the flow direction via actuating or pushing rods 104.

[0086] According to an eighth embodiment and with reference to figure 11, in particular figures 11a, 11b and 11c, the hydraulic thruster comprises: - a single motor 110 whose rotation shaft is parallel to and in the direction of flow of the fluid to be moved, the motor being designed to remain in water during operation,

[0087] - two discoidal membranes 111a, 111b, arranged opposite each other and transversely to the direction of flow of the fluid, a flange (not shown) being located between the motor and the membrane 111b, and

[0088] - a bevel gear system 118 with teeth, comprising an input 118a and four outputs 118b, the input of the system being connected to the drive shaft, each output of the gear being connected to a connecting rod 112 via the end of the connecting rod which is connected to a shaft or stud eccentric to the axis of rotation of said output, each gear output and connecting rod assembly forming a connecting rod / crank system for setting the membranes in motion via actuating or pushing rods 114.

[0089] According to a ninth embodiment and with reference to figure 12, in particular figures 12a, 12b, 12c and 12d, the hydraulic thruster comprises: - a motor 120 whose shaft is arranged vertically and substantially perpendicular to the direction of movement of the fluid, this shaft is extended by an offset shaft 126, the motor being designed to remain out of water during operation - a tubular membrane 121, - a tubular flange 127, - a 128 bevel gear system with teeth, arranged at the end of the offset shaft, - a star cam system 122 whose outer surface cooperates with four radially extending actuating or pushing rods 124, each distal end of which is connected to or in contact with a radial pushing part itself in contact with a portion of the inner circumference of said membrane.

[0090] According to a tenth embodiment and with reference to figure 13, in particular figures 13a, 13b, the hydraulic thruster comprises: - a motor 130 whose rotation shaft is parallel to and in the direction of flow of the fluid to be moved, the motor being designed to remain in the water during operation, - a tubular membrane 131, the axis of the motor being coaxial with the axis of the tubular membrane, - a tubular flange 137, - a cam system 132 comprising a disc comprising a groove forming a closed and continuous path along a predetermined trajectory, said system further comprising three rods 134 extending radially, each distal end of which is connected to or in contact with a radial thrust piece itself in contact with a portion of the inner circumference of said membrane, each rod having a shape, for example a finger, arranged to cooperate with the groove.

[0091] According to an eleventh embodiment and with reference to figure 14, in particular figures 14a, 14b and 14c, the hydraulic thruster comprises: - a motor 140 whose rotation shaft is parallel to the direction of flow of the fluid to be moved, the motor being designed to remain in the water during operation, - a tubular membrane 141, the axis of the motor being offset relative to the axis of the tubular membrane, - a tubular flange (not visible in the figure), - a connecting rod / crank system 142 and a pinion / rack system 144, the pinion being rotated by the connecting rod, the pinion / rack system comprising 3 racks having the form of rectilinear toothed rods and being distributed around said pinion in a radial manner, each rack being in contact with a portion of the inner circumference of said membrane, so that a rotation of the pinion causes the radial extension of the racks to set said membrane in motion.

[0092] According to a twelfth embodiment and with reference to figure 15, in particular to figures 15a, 15b, 15c, the hydraulic thruster comprises: - a motor 150 whose rotation shaft extends substantially vertically or substantially perpendicularly to the direction of movement or of the fluid, the motor being designed to remain out of the water during operation, this shaft being extended by an offset shaft 156, see figure 15a, - a control shaft 153 connected to the offset shaft 156 via two toothed wheels, - a conversion system comprising two double connecting rod / crank systems 152, two membrane shafts 154a, 154b and four translational guide means 155, and - two membranes 151a, 151b in the form of a four-sided sheet and arranged substantially vertically, arranged opposite flanges 157a, 157b, preferably operating in phase opposition.

[0093] The connecting rod / crank system comprises an upper pair of connecting rod / crank systems 152a, 152b arranged at a first end of the control shaft 153 and a lower pair of connecting rod / crank systems 152c, 152d arranged at a second end of the control shaft 153, each pair comprising two superimposed cranks whose eccentrics are opposite, the ends of the connecting rods being connected to a membrane shaft 154a, 154b, the upper connecting rod and the lower connecting rod having an eccentric on the same side are connected to the same membrane shaft. A guide means 155 is associated with one end of a control shaft.

[0094] Preferably, the device comprises two vertical rectangular membranes, operating in phase opposition, actuated by four eccentrics (one per corner of the leading edge of the membrane), the linear guidance of the membrane being done on rollers (or bearings or slides...).

[0095] According to an embodiment represented by Figure 15b, each end of the control shaft 154a, 154b has a pulley arranged to roll on the associated translational guide means. The connecting rod / crank system makes it possible to set the membrane shafts in alternating translational movement; the guide means making it possible to guide the translation of the shafts and set them in rotation.

[0096] According to another embodiment shown in Figure 15c, each end of control shaft 154a, 154b is connected to a groove.

[0097] According to a thirteenth embodiment and with reference to figure 16, in particular to figures 16a, 16b, 16c and 16d, the hydraulic thruster comprises: - a motor 160 whose rotation shaft extends substantially vertically or substantially perpendicularly to the direction of movement or of the fluid, the motor being designed to remain out of the water during operation, this shaft being extended by an offset shaft 166, see figures 16a, 16b, - a conversion system 162 comprising a toothed crown 161b actuated by an offset pinion 161a connected to the offset shaft, rod translation elements, - a discoidal membrane not shown.

[0098] With reference to figures 16c and 16d, each rod translation element comprises a control pinion 163 driven in rotation by the crown, an eccentric wheel 165 driven in rotation by the control pinion 163, the eccentric of said control pinion forming a crank, a connecting rod 167 connected to the eccentric wheel 165, said connecting rod being connected to an intermediate piece 168 which is connected to a pair of rods 164. Each translation element being connected to two rods 164 making it possible to put the membrane into translational movement.

[0099] With reference to Figures 16b and 16c, the eccentric wheel 165 comprises an eccentric portion having a bore whose axis is parallel and distinct from the axis of rotation of the eccentric wheel. The eccentric axis is common with the pivot axis of one end of the connecting rod 167. The eccentric wheel 165 further comprises a balancing portion in the form of a half-disc opposite the eccentric relative to the axis of rotation of the eccentric wheel. The balancing portion makes it possible to limit vibrations and the unbalance phenomenon during operation of the device. Preferably, the mass of the balancing portion is arranged and configured to imitate vibrations and the unbalance phenomenon.

[0100] According to a fourteenth embodiment and with reference to figure 17, in particular to figures 17a and 17b, the hydraulic thruster comprises: - a motor 170 whose rotation shaft extends substantially parallel to the direction of movement or of the fluid, the motor being designed to remain in the water during operation, - a conversion system mounted coaxially with the engine, said system comprising a cylinder 172 whose peripheral surface comprises a zigzag-shaped groove, said groove extending radially, and rods extending substantially parallel to the direction of movement or of the fluid, each rod being connected on the one hand to the groove by means of a finger housed in said groove and arranged to translate during operation, and on the other hand a discoidal membrane, each rod being guided in translation by bearings.

[0101] According to an alternative embodiment, the device or a pump comprising two grooves, actuating two membranes with fingers, each membrane being actuated by a groove, each membrane being arranged at an axial end of the propellant or the pump. This embodiment has the advantages of limiting the phenomenon of unbalance and limiting vibrations.

[0102] According to a fifteenth embodiment and with reference to figure 18, the hydraulic thruster comprises: a motor 180 whose rotation shaft is parallel and to the direction of flow of the fluid to be moved, the motor being designed to remain in the water during operation, - a tubular membrane 181, the axis of the motor being coaxial with the axis of the tubular membrane, - a star-shaped cam system 182 whose outer surface cooperates with six radially extending actuating or pushing rods 184, each proximal end of which is connected or in contact with the star-shaped cam via position return means, preferably springs, each rod being connected to a pushing portion corresponding to a portion of the inner circumference of said membrane.

[0103] According to a sixteenth embodiment and with reference to figure 19, in particular to figures 19a, 19b, the hydraulic thruster comprises: a motor (not shown) whose rotation shaft is parallel to the direction of flow of the fluid to be moved, the motor being designed to remain in the water during operation, - a discoidal membrane 191, the axis of the motor being coaxial with the axis of the membrane, - a cam system 192 arranged on a transverse face, the outer surface of which cooperates with four actuating or pushing rods 194 extending parallel to the direction of flow of the fluid to be moved, each proximal end of which is connected or in contact with the cam and each distal end of which is connected to the membrane, which is returned to the initial position by springs fixed relative to the frame.

[0104] According to a seventeenth embodiment and with reference to figure 20, the hydraulic thruster comprises: a motor (not shown) whose rotation shaft is parallel to the direction of flow of the fluid to be moved, an offset shaft being connected to the rotation shaft, - a membrane in the form of a rectangular sheet 201, - a cam conversion system 202 further comprising an actuating rod disposed between the cam and the end of the membrane.

[0105] Of course, the invention is not limited to the implementation mode(s) described and variant embodiments can be made without departing from the scope of the invention, in particular but not limited to by combining these different mechanical conversion means, these different motors, and these different membranes.

Claims

CLAIMS Fluid flow generating device (100) arranged to move a fluid in a direction of movement (D), the device comprising: - a frame (1), - at least one membrane (11, 41a, 41b, 51, 61, 71, 81a, 81b, 91a, 91b, 91c, 101, 111a, 111b, 121, 131, 141, 151a, 151b, 171, 181, 191, 201) arranged to set the fluid in motion, - at least one actuator (10, ) setting the at least one membrane in motion or being actuated by the movement of the at least one membrane, characterized in that: - the at least one actuator performs a rotary movement, - the device further comprises at least one rotary / linear mechanical conversion system (12, 22) arranged between the at least one actuator and the at least one membrane. Device according to claim 1, wherein the at least one membrane (11, 41a, 41b, 51, 61, 71, 81a, 81b, 91a, 91b, 91c, 121, 131, 141, 151a, 151b, 181, 201) extends parallel to the direction of movement (D). Membrane device according to claim 1 or 2, wherein the at least one membrane comprises at least one polygonal, preferably rectangular, or triangular, or trapezoidal membrane. Device according to one of the preceding claims, wherein the at least one membrane comprises at least one membrane (101, 111a, 111b, 171, 191) extending transversely with respect to the direction of movement (D). Device according to the preceding claim, wherein the at least one membrane comprises at least one membrane having a cylindrical, preferably discoidal, or ovoid shape.Device according to one of the preceding claims, wherein the at least one membrane comprises a tubular membrane (121, 131, 141, 181) extending parallel to the direction of movement (D). Device according to one of the preceding claims, comprising at least one flange (47, 57, 67a, 67b, 77, 87a, 87b, 97a, 97b, 97c, 127, 137, 157), and the at least one. membrane being arranged opposite the at least one flange and arranged to set the fluid in motion. Device according to one of the preceding claims, in which the at least one actuator is chosen from the following list of actuators: a turbine, or a heat engine, preferably a piston engine, or an electric motor, or a mechanical motor or a combination thereof. Device according to one of the preceding claims, in which the at least one conversion system is chosen from the following list of systems: a connecting rod / crank system, or a slide / crank system, or a connecting rod system coupled to a chain or a belt, or a cam system, or a pinion / rack system or a wheel and worm system, or a crankshaft system, or a crown and planetary pinion system or a combination thereof.Device according to one of the preceding claims, further comprising a displacement system between the at least one actuator and the at least one membrane, preferably between the at least one actuator and the at least one rotary / linear mechanical conversion system. Device according to one of claims 1 to 10, comprising a single actuator, at least two membranes and in which the at least one rotary / linear mechanical conversion system comprises at least two connecting rod / crank systems or cam systems.Device according to one of claims 1 to 10, wherein the at least one rotary / linear mechanical conversion system comprises at least one connecting rod / crank system (82, 92, 112), at least one push rod (84, 94), each connecting rod being connected to a push rod, each push rod being connected to the at least one membrane (81a, 81b, 91a, 91b, 91c) extending parallel to the direction of movement (D), or being connected to the at least one membrane (11a, 111b) extending transversely to the direction of movement (D). Device according to one of claims 1 to 9, with the exception of claims 2 and 6, further comprising: - at least one longitudinal offset shaft (106, 156), each offset shaft being connected to a shaft of an actuator via a proximal end of the offset shaft, device in which:. - the at least one rotary / linear mechanical conversion system comprises at least a connecting rod / crank system (102) or a slide / crank system or a cam system or a crankshaft system, or a crown and planetary pinion system (162), - the at least one membrane (101) extending transversely to the direction of movement, each connecting rod / crank system or slide / crank system or cam system or crankshaft system or a crown and planetary pinion system being connected on the one hand to an offset shaft, preferably via a distal end of the offset shaft, and on the other hand a membrane. Device according to one of claims 1 to 9 with the exception of claims 4 and 5, comprising at least one longitudinal offset shaft (46a, 46b, 56, 66, 126), each offset shaft being connected to a shaft of an actuator via a proximal end of the offset shaft, device in which: - the at least one rotary / linear mechanical conversion system comprises at least one connecting rod / crank system (42, 52) or one slide / crank system (62) or one cam system (122) or one crankshaft system, - the at least one membrane (41a, 41b, 51, 61, 121) extending parallel to the direction of movement (D), each connecting rod / crank system or slide / crank system or cam system or crankshaft system being connected on the one hand to an offset shaft via a distal end of the offset shaft and on the other hand to a membrane. Device according to one of claims 1 to 10, wherein the at least one rotary / linear mechanical conversion system comprises at least two pulleys or toothed wheels (72a, 72b), one of which is connected to the rotation shaft of the at least one actuator (70), at least one flexible link (73) connecting in rotation the at least two pulleys or toothed wheels, a lever arm (75) having a rotation shaft connected to the frame of the device, the lever arm being able to pivot around this shaft, a lever connecting rod (753) connected at a first end to the flexible link (73) and at a second end to the lever arm (75),so as to pivot the lever arm by means of the lever connecting rod set in motion by the flexible link, the device further comprising at least one actuating rod (74) of the at least one membrane, and at least one rod connecting rod (754) connected at a first end to the lever arm (75) and at a second end to the actuating rod (74). Device according to one of claims 1 to 10, with the exception of claims 3, 4, 5, in which:, - the at least one rotary / linear mechanical conversion system comprises at least a cam conversion system (132, 182), and - the at least one membrane is a tubular membrane (131, 181), the axis of the at least one actuator and / or the axis of the at least one rotary / linear mechanical conversion system being coaxial with the axis of the tubular membrane, the cam system comprising a disc comprising a groove providing a closed and continuous path along a predetermined trajectory, said system further comprising at least one rod (134) extending radially, each distal end of which is connected to or in contact with a radial thrust piece (134b) itself in contact with a portion of the circumference of said membrane (131), each rod having a shape, for example a finger, arranged to cooperate with the groove. Device according to one of claims 1 to 10, with the exception of claims 3, 4, 5, in which: - the at least one rotary / linear mechanical conversion system comprises at least one cam conversion system (182), and - the at least one membrane is a tubular membrane (181), the axis of the at least one actuator and / or the axis of the at least one rotary / linear mechanical conversion system being coaxial with the axis of the tubular membrane, the cam system having a surface comprising a succession of concave and convex portions, said system further comprising at least one rod (184) extending radially, each proximal end of which is connected or in contact with said surface, each rod being connected or in contact with a portion of the circumference of said membrane (181). Device according to one of claims 1 to 10 with the exception of claims 3, 4, 5, wherein: - the at least one rotary / linear mechanical conversion system comprises at least one connecting rod / crank system (142) connected to a wheel / rack system (144), and - the at least one membrane is at least one tubular membrane (141), the axis of the at least one actuator being spaced from the axis of the tubular membrane, the latter axis corresponding to the axis of the wheel, the wheel / rack system being arranged in the center or on the periphery of the tubular membrane (141), one end of each rack being connected or in contact with a radial thrust part itself in contact with a portion of the circumference of said membrane, one end, called the motor, of the connecting rod being connected to an eccentric connected at a distance from the axis on the shaft of the at least one actuator, the crank being connected in rotation with the wheel, so that the rotation of the wheel, driven via the connecting rod / crank system, moves the racks which exert a radial force on the tubular membrane. Device according to one of claims 1 to 10, comprising one or more membranes arranged to operate in phase or in phase opposition, preferably comprising positioning means. Device according to one of the preceding claims, further comprising a system for adjusting the stroke of the linear actuation of the membrane. Device according to one of the preceding claims, further comprising at least one system for reducing or multiplying the rotational speed or the force of the at least one actuator and / or of the at least one rotary / linear mechanical conversion system and / or at least one system for reducing or multiplying the oscillation frequency of the at least one membrane. Device according to one of the preceding claims, further comprising sealing means connected to the at least one actuator and / or to the at least one rotary / linear mechanical conversion system and / or to the at least one membrane.Device according to one of the preceding claims, comprising one or more actuator(s), at least two membranes, at least one rotary / linear mechanical conversion system, each system being connected to a membrane, the systems being arranged to undulate the membranes in phase, or out of phase or in phase opposition. Hydraulic thruster for the propulsion of nautical craft characterized in that it comprises a flow generating device according to one of the preceding claims. Hydrogenerator characterized in that it comprises a flow generating device according to one of claims 1 to 23. Pump characterized in that it comprises a flow generating device according to one of claims 1 to 23. Compressor characterized in that it comprises a flow generating device according to one of claims 1 to 23. Fan characterized in that it comprises a flow generating device according to one of claims 1 to 23.

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