Tidal power generating device

Abstract

The present invention relates to a tidal power generating device with a vertical rotor unit comprising a plurality of blades arranged in a circumferential direction. A tail unit is configured for directing a water inlet towards the flow of water, thereby allowing the tidal power generating device to harvest energy during both high tide and low tide.

Description

[0001] Tidal power generating device

[0002] Technical field of the invention

[0003] The present invention relates to tidal power generating devices.

[0004] Background of the invention

[0005] Tidal power plants often utilize a barrage, a specific type of dam, particularly in river environments. These plants are equipped with hydraulic turbines and electric generators. The operation of these turbines can vary depending on their design. In some plants, the turbines are bidirectional, allowing them to generate electricity during both the high tide and low tide phases. During high tide, water flows from the outer bay into the basin, turning the turbines and generating power. Conversely, during low tide, water flows from the basin back to the outer bay, continuing power generation - this is known as two-way generation.

[0006] In other designs, the turbines operate unidirectionally, generating electricity only during one phase of the tidal cycle. For instance, they may generate power exclusively during high tide (flood generation) or only during low tide (ebb generation), but not both. An example of such a facility is the "La Rance" Tidal Power Station, which is not only one of the first but also one of the largest tidal power stations in the world.

[0007] However, a significant environmental challenge associated with tidal power plants that use a barrage is the progressive silting of the river ecosystem. This silting can disrupt the natural habitat, leading to the decline and eventual disappearance of local fauna and fish species, highlighting a key ecological concern for this type of renewable energy infrastructure.

[0008] Hence, there is a need for a tidal power plant that minimizes the biological impact on the environment in which it is positioned.

[0009] Summary of the invention

[0010] A first aspect relates to a tidal power generating device comprising:

[0011] - a base unit adapted for anchoring into a seabed or riverbed;

[0012] - a rotor unit comprising a plurality of blades arranged in a circumferential direction; and

[0013] - an electrical generator operatively connected to the rotor unit; wherein the base unit comprises a vertical support member, and wherein the rotor unit comprises a cylindrical support member rotatably mounted around said vertical support member, wherein said plurality of blades are mounted to or formed in said cylindrical support member; and

[0014] - a cover unit rotatably mounted to said base unit and adapted for at least partly covering said cylindrical support member including said plurality of blades, wherein said cover unit comprises a cavity adapted for containing said cylindrical support member including said plurality of blades, said cover unit comprising an inlet adapted for directing water into the cavity of said cover unit and an outlet adapted for directing water away from the cavity of said cover unit.

[0015] This configuration allows for a tidal power generating device that is independent of the presence of a barrage, thereby allowing the body of water to flow freely with a minimal generation of silt as a result.

[0016] As used in the specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Ranges may be expressed herein as from "about" or "approximately" one particular value and / or to "about" or "approximately" another particular value. When such a range is expressed, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about", it will be understood that the particular value forms another embodiment.

[0017] It should be noted that embodiments and features described in the context of one of the aspects of the present invention also apply to the other aspects of the invention.

[0018] Brief description of the figures

[0019] Figure 1 shows a perspective view of a tidal power generating device in accordance with various embodiments of the invention.

[0020] Figure 2 shows a cross-sectional view of a tidal power generating device in accordance with various embodiments of the invention.

[0021] Figure 3 shows a front view of a tidal power generating device in accordance with various embodiments of the invention.

[0022] Figure 4 shows a rear view of a tidal power generating device in accordance with various embodiments of the invention.

[0023] Figure 5 shows a cover for a tidal power generating device in accordance with various embodiments of the invention.

[0024] Figure 6 shows a tidal power generating device in accordance with various embodiments of the invention, where the cover has been removed.

[0025] Figure 7 shows a base unit for a tidal power generating device in accordance with various embodiments of the invention.

[0026] Figure 8 shows a perspective view of a part of tidal power generating device in accordance with various embodiments of the invention.

[0027] Figure 9 shows a top view of a part of tidal power generating device in accordance with various embodiments of the invention.

[0028] Detailed description of the invention

[0029] In the present context, the term “in general” when used when mentioning a feature relating to the present invention, it must be understood that the feature may be used with all embodiments of the invention, even if the mentioning is made in the detailed part of the document.

[0030] The first aspect relates to a tidal power generating device comprising:

[0031] - a base unit adapted for anchoring into a seabed or riverbed;

[0032] - a rotor unit comprising a plurality of blades arranged in a circumferential direction; and

[0033] - an electrical generator operatively connected to the rotor unit; wherein the base unit comprises a vertical support member, and wherein the rotor unit comprises a cylindrical support member rotatably mounted around said vertical support member, wherein said plurality of blades are mounted to or formed in said cylindrical support member; and

[0034] - a cover unit rotatably mounted to said base unit and adapted for at least partly covering said cylindrical support member including said plurality of blades, wherein said cover unit comprises a cavity adapted for containing said cylindrical support member including said plurality of blades, said cover unit comprising an inlet adapted for directing water into the cavity of said cover unit and an outlet adapted for directing water away from the cavity of said cover unit. In general, the tidal power generating device comprises a base unit configured to anchor the device to a seabed, riverbed, or other submerged foundation. The base unit serves as the primary structural support for the entire generating assembly and ensures the stability and positional integrity of the device under varying hydrodynamic conditions.

[0035] In one or more embodiments, the base unit includes a foundation structure, such as a weighted platform, pile-driven footings, suction anchors, or other anchoring means suitable for secure attachment to the underwater terrain. The specific anchoring technique may be selected based on environmental factors including seabed composition, tidal strength, and deployment depth.

[0036] Extending vertically from the foundation structure is a vertical support member, which is rigidly connected to the base and extends upward into the water column. This vertical support member serves as the mounting axis for the cylindrical support member of the rotor unit, which is rotatably mounted around it. The vertical support member is preferably cylindrical or tubular and may be formed from a corrosion-resistant material suitable for prolonged underwater use, such as coated steel or a composite material.

[0037] In some embodiments, the vertical support member may also house internal components such as electrical cabling, signal wiring, or even the generator itself, providing both structural and functional integration. Additionally, the support member may be hollow to facilitate the routing of hydraulic or pneumatic lines connected to actuators used in the pivoting gate unit.

[0038] The base unit may optionally include one or more buoyancy control elements or ballast chambers to assist in the deployment, leveling, or retrieval of the device. These chambers may be filled or emptied with fluid or air to regulate buoyancy and stabilize the unit during installation or maintenance.

[0039] In certain embodiments, the base unit may be adapted to permit rotational or tilting adjustment of the vertical support member, thereby allowing the rotor unit and associated cover unit to be oriented optimally relative to prevailing tidal currents. Such adjustments may be performed manually during installation or automatically through an active alignment mechanism.

[0040] Overall, the base unit functions not only as a structural anchor but also as a key interface between the tidal generating components and the marine environment. It provides foundational stability, vertical alignment, and optionally functional integration of mechanical, hydraulic, and electrical subsystems necessary for efficient and durable operation.

[0041] In general, the tidal power generating device includes a rotor unit configured to convert the kinetic energy of flowing water into rotational mechanical energy. The rotor unit is operatively connected to an electrical generator, which converts the rotational energy into usable electrical power.

[0042] In one or more embodiments, the rotor unit comprises a cylindrical support member that is rotatably mounted around the vertical support member of the base unit. This cylindrical support member forms the core structural body of the rotor and rotates about a generally vertical axis defined by the vertical support member. The cylindrical support member may be constructed from a durable, hydrodynamically favorable material, such as coated steel, aluminum alloy, or a marine-grade composite.

[0043] A plurality of blades are mounted to or integrally formed with the cylindrical support member. These blades are arranged in a circumferential configuration around the outer surface of the cylindrical support member, such that water flowing tangentially through the rotor unit exerts torque on the blades and causes the cylindrical support member to rotate. The blade geometry may vary according to application but is generally optimized for tidal flow conditions, with features such as helical twist, hydrofoil crosssection, or angle-of-attack adjustment mechanisms.

[0044] In some embodiments, the blades may be fixed in position, while in others they may be adjustable in pitch, either manually or automatically, to enhance energy conversion under varying flow speeds. The pitch adjustment may be facilitated by actuators embedded within the cylindrical support member or by external mechanical linkages.

[0045] The rotor unit is mechanically coupled to an electrical generator, which may be housed within the base unit, the vertical support member, or in proximity to the rotor’s rotational axis. The coupling may be direct, through a shaft, or indirect, via gearing or magnetic coupling. The generator may be positioned to remain stationary while the rotor spins, or in some configurations, it may co-rotate with the cylindrical support member, depending on the system architecture.

[0046] In a preferred embodiment, the rotor unit is positioned at a lateral side within the cavity of the cover unit. This arrangement allows the rotor to interact with a controlled water stream guided by the internal flow geometry of the cover and modulated by a pivoting gate unit arranged opposite the rotor. Such placement enables the system to exploit asymmetric flow patterns and directional control to maximize energy extraction.

[0047] The cylindrical support member may also serve secondary functions, such as housing wiring, providing structural stiffness, or channeling water through internal pathways to influence local hydrodynamics. In some embodiments, buoyant or hydrodynamic fairings may be added to reduce drag or enhance flow capture. Overall, the rotor unit is a central component of the tidal power generating device, combining robust structural design with hydrodynamic efficiency and functional integration with the cover and base units. It is specifically adapted for high-reliability, low-maintenance operation in submerged environments over extended deployment periods.

[0048] In general, the tidal power generating device includes an electrical generator configured to convert mechanical rotational energy, produced by the rotor unit, into electrical energy for external use or storage. The generator forms a key part of the system’s energy conversion pathway and may be integrated in various ways depending on design constraints, environmental conditions, and operational preferences.

[0049] In one or more embodiments, the electrical generator is operatively connected to the cylindrical support member of the rotor unit. As the rotor unit rotates under the influence of water flow, its motion drives the generator to produce electrical power. The connection between the rotor and generator may be direct, via a rotational shaft or axle, or indirect, such as through a gear system, belt drive, or magnetic coupling.

[0050] In a preferred embodiment, the electrical generator is housed within the base unit, such as inside or adjacent to the vertical support member. This positioning offers several advantages, including protection from water exposure, ease of maintenance, and structural integration with anchoring and wiring systems. The vertical support member may contain a central passage or conduit for accommodating the generator shaft and associated power transmission components.

[0051] Alternatively, the generator may be housed within or adjacent to the rotor unit itself, particularly in cases where a direct-drive configuration is used. In such embodiments, the generator may be mounted coaxially with the cylindrical support member and rotate synchronously with it, reducing the need for complex transmission systems. This arrangement may also enable more compact or modular device architectures.

[0052] The electrical generator may be of any suitable type for underwater or marine energy systems. Common generator types include synchronous generators, permanent magnet generators, and induction generators, all of which may be adapted for submersion or pressure-sealed environments. In configurations where the generator is exposed to or partially submerged in water, appropriate sealing, cooling, and corrosion-resistant materials are used to ensure long-term durability.

[0053] Electrical power produced by the generator may be transmitted via subsea cables running through the base unit and connected to an external power collection or storage system, such as a substation or grid interface. In some embodiments, power conditioning equipment, including converters or inverters, may be co-located with the generator or placed externally, depending on the voltage and waveform requirements of the output.

[0054] In configurations that include a pivoting gate unit and control electronics, the generator may further supply power to onboard systems responsible for actuator movement, sensor operation, or communication with surface or shore-based monitoring equipment. Where energy production is intermittent or variable, a battery buffer or capacitor system may be used to regulate power delivery for such control functions.

[0055] Overall, the electrical generator is designed to be robust, low-maintenance, and highly efficient, with its placement and integration tailored to the unique mechanical layout and operating environment of the tidal power generating device. It serves as the core transducer that enables the conversion of marine kinetic energy into a usable electrical resource.

[0056] In general, the tidal power generating device comprises a cover unit adapted to enclose and direct waterflow around the rotor unit. The cover unit plays a critical role in channeling tidal currents through the rotor blades in a controlled and efficient manner, thereby enhancing the device’s energy capture performance and hydrodynamic behavior.

[0057] In one or more embodiments, the cover unit is rotatably mounted to the base unit, such that it is capable of adjusting its orientation relative to the direction of water flow. This rotational capability may be passive, e.g., via flow-aligned fins or buoyant stabilization, or active, such as through a motorized yaw mechanism, allowing the cover to align with changing tidal directions to maintain optimal inflow conditions.

[0058] The cover unit comprises a cavity, which defines an internal flow path or channel adapted to contain and guide water through the region occupied by the rotor unit. The cavity is shaped and dimensioned to accommodate the cylindrical support member and the attached blades, ensuring sufficient clearance for rotation while enabling effective hydrodynamic coupling between the water flow and the rotor.

[0059] An inlet is formed in the cover unit to admit water into the cavity. This inlet is preferably oriented toward the prevailing water flow and may be shaped or contoured to concentrate, accelerate, or stabilize incoming water before it reaches the rotor. Similarly, an outlet is provided to allow water to exit the cavity after interaction with the rotor. The outlet may be configured to reduce flow turbulence or to maximize energy extraction by preserving favorable pressure differentials across the rotor blades.

[0060] In a preferred embodiment, the cover unit further comprises a pivoting gate unit arranged within the cavity and operable to regulate the waterflow through the cover. The pivoting gate is typically located opposite the rotor unit, creating an asymmetric flow profile that can be dynamically controlled to optimize energy output. The gate may be actuated by hydraulic or pneumatic means and managed by a control system that responds to realtime sensor data such as flow velocity, direction, or turbine output.

[0061] In some embodiments, the pivoting gate unit is not only configured to regulate the volume of water passing through the cover unit’s cavity but is also specifically adapted to direct waterflow toward the rotor unit. By shaping the flow path internally within the cavity, the gate influences the velocity vector and angle of incidence of water impinging on the rotor blades. This function enhances the efficiency of the rotor by ensuring that the fluid energy is transferred more effectively to the blades, especially under varying tidal conditions.

[0062] The pivoting gate unit may be positioned opposite the rotor unit within the cavity, creating an asymmetric flow pattern. In this arrangement, the gate serves not merely as a flow restrictor but as a hydrodynamic guide surface, which can alter the internal flow channel geometry to favor one side of the rotor. This asymmetric shaping is particularly advantageous when the rotor is offset laterally within the cavity, as it allows targeted flow control to the active region of the rotor.

[0063] To allow for operational flexibility and real-time responsiveness, the pivoting gate unit may be adjustably positionable within the cavity. This may involve a rotatable mounting with variable angular range, or translational movement along a guide track. In such configurations, the gate’s angle and position can be modified dynamically to fine-tune the direction and distribution of waterflow toward the rotor. The adjustment may be manual, automated, or responsive to environmental inputs such as flow rate, direction, or rotor load.

[0064] By integrating directional control, asymmetric flow shaping, and gate position adjustability, the pivoting gate unit functions as an active flow management component rather than a passive barrier, enhancing the performance and adaptability of the tidal power generating device.

[0065] The internal surfaces of the cover unit may include hydrodynamic features, such as flow guides, baffles, or vanes, which assist in stabilizing or directing the flow as it interacts with the rotor. In some embodiments, the cavity may taper or widen in specific regions to manipulate flow speed and pressure in accordance with Bernoulli’s principles or to accommodate blade-induced wake dynamics.

[0066] Structurally, the cover unit may be constructed from marine-grade materials, such as fiberglass-reinforced composites, corrosion-resistant alloys, or molded polymers, ensuring long-term durability and minimal biofouling. The cover may also serve secondary purposes such as providing protection to the rotor from debris, marine life, or accidental impact.

[0067] In its integrated form, the cover unit not only protects and channels water to the rotor but also functions as a flow conditioning enclosure that enables advanced control of fluid dynamics within the turbine system. The combination of a rotatable cover, an enclosed cavity, and a dynamically adjustable gate offers significant operational advantages in adapting to bidirectional or variable tidal currents.

[0068] In a preferred embodiment, the tidal power generating device further comprises a tail unit mounted to the cover unit and extending outward from it. The tail unit is positioned on the side of the cover unit opposite the inlet, thereby forming a rearward-extending structure relative to the direction of incoming water. This configuration is particularly advantageous in enabling the device to automatically orient itself with respect to the tidal flow. As the water current changes direction, such as during transitions between high tide and low tide, the tail unit acts as a passive lever, upon which the body of water exerts force. This hydrodynamic interaction naturally rotates the cover unit so that the inlet consistently faces into the prevailing flow, maintaining optimal alignment for energy capture without requiring active mechanical adjustment.

[0069] In some embodiments, the outlet of the cover unit is located proximate to the base of the tail unit. This positioning allows water exiting the rotor cavity to flow directly into or around the tail structure. In further embodiments, the tail unit is configured to flank the outlet, effectively surrounding or partially enclosing the region through which the water discharges. This arrangement may assist in shaping the exit stream and reducing turbulence, while contributing to the self-aligning function of the device.

[0070] In an alternative or complementary configuration, the tail unit is tubular in shape and is formed as a direct extension of the outlet. In this arrangement, the tail unit operates not only as a passive stabilizing structure but also as a part of the water discharge pathway. The tubular design helps guide water away from the rotor area in a controlled and streamlined manner, potentially enhancing downstream flow efficiency and reducing wake interference.

[0071] To further facilitate efficient water egress, the tail unit may include wall sections perforated with a plurality of holes. These holes are strategically distributed along the tail’s surface and serve to allow water to escape more rapidly from the internal volume of the tail. This venting effect can reduce backpressure within the tail structure and improve the flow-through characteristics of the overall system, particularly under high-flow conditions or when flow direction changes rapidly.

[0072] Altogether, the tail unit provides both functional and hydrodynamic advantages, serving as a passive alignment aid, an extension of the flow path, and a structural feature that contributes to the overall efficiency and responsiveness of the tidal power generating device. Its integration with the cover unit and relationship to the inlet and outlet reinforce the coherent operation of the system across tidal cycles and varied marine conditions.

[0073] Preferably the tidal power generating device further comprises a tail unit mounted to said cover unit and extending outwards therefrom, wherein the tail unit is positioned opposite to the inlet of said cover unit. This configuration allows the tidal power generating device to move its inlet towards the water flow both during high tide and low tide as it acts as a lever that the body of water itself acts upon.

[0074] In one or more embodiments, the outlet is located near the tail unit.

[0075] In one or more embodiments, the tail unit is flanking the outlet of said cover unit.

[0076] In one or more embodiments, the tail unit is tubular and configured as an extension of said outlet.

[0077] In one or more embodiments, the tail unit comprises wall sections with a plurality of holes formed therein. These holes may serve to allow the water to escape faster from the tail unit.

[0078] In certain embodiments, the tidal power generating device further comprises a head unit mounted to the cover unit and extending outward therefrom in the direction of the inlet. The head unit serves as a forward- facing structure designed to assist in directing water into the cavity of the cover unit, thereby improving the flow profile through the rotor and enhancing the overall efficiency of energy conversion.

[0079] The head unit is generally configured to be of significantly shorter length than the tail unit, with its extension being limited to what is necessary for flow shaping and protective functions. Its compact profile reduces resistance and mechanical complexity while still offering hydrodynamic benefits at the point of water intake.

[0080] In some embodiments, the head unit is arranged to flank or partially enclose the inlet of the cover unit. By doing so, it serves to stabilize incoming water, reduce turbulence, and guide the flow into the cavity with improved directionality. This flanking configuration also contributes to protecting the rotor from erratic or off-angle currents, particularly during periods of changing tidal flow.

[0081] In one preferred configuration, the head unit is tubular in shape and configured as a direct extension of the inlet. A first end of the tubular structure is mounted to or around the inlet opening of the cover unit, forming a seamless hydrodynamic transition into the internal cavity. The opposite, second end of the tubular head unit defines a water-receiving opening, which is oriented toward the direction of incoming tidal flow. This arrangement provides a controlled and focused entry point for the water entering the energy conversion system.

[0082] To enhance environmental compatibility and operational safety, the head unit may be fitted with a grid structure mounted within or directly in front of the water-receiving end. This grid is adapted to prevent larger marine animals or debris from entering the head unit and, by extension, the rotor cavity. The grid may be fixed, replaceable, or self-cleaning depending on the operating environment, and is typically formed from corrosion-resistant materials suited for long-term underwater deployment.

[0083] Through its integration with the cover unit and alignment with the inlet, the head unit functions not only as a hydrodynamic intake structure but also as a protective barrier and flow conditioner. Its relatively short extension ensures minimal obstruction while still contributing meaningfully to water flow guidance and environmental safeguarding. Together with the tail unit, the head unit defines a front-to-rear fluid pathway that enhances the tidal power generating device’s stability, efficiency, and ecological compatibility.

[0084] In one or more embodiments, the tidal power generating device further comprises a head unit mounted to said cover unit and extending outwards therefrom. Preferably, the head unit is of an extension substantially less than the tail unit. In some embodiments, the head unit is adapted for flanking the outlet of said cover unit, and for directing water into the inlet of said cover unit.

[0085] In one or more embodiments, the head unit is tubular and configured as an extension of said inlet.

[0086] In one or more embodiments, a first end of the tubular head unit is mounted to or around the inlet of the cover unit, and an opposite second end forming an opening adapted for receiving water. Preferably, the head unit comprises a grid mounted within or in front of the second end and adapted for preventing larger animals from entering the head unit and subsequently entering the cavity of said cover unit.

[0087] In one or more embodiments, the tidal power generating device is configured with a modular rotor assembly that enhances ease of manufacturing, transport, installation, and maintenance. This modular configuration applies both to the blades and to the cylindrical support member to which the blades are mounted.

[0088] The rotor blades are preferably mounted to the cylindrical support member, and in some embodiments, the mounting is designed to be releasable. This allows for individual blades to be removed, replaced, or serviced without requiring disassembly of the entire rotor unit. Such a configuration facilitates more efficient maintenance operations, particularly in offshore or remote locations where handling large integrated components can be difficult.

[0089] Each rotor blade may be formed from two or more blade subunits, which are preferably identical or at least standardized in form. These blade subunits are connected to one another to form a complete blade and are collectively mounted to the cylindrical support member. The use of smaller, interchangeable subunits simplifies logistics during assembly and transport and allows for selective replacement of worn or damaged sections rather than entire blades. This modularity also makes it easier to store spare parts and adapt the blade geometry if design upgrades or environmental conditions require changes.

[0090] In a further embodiment, the cylindrical support member itself is composed of two or more subunits, each configured to receive and support a set of blade subunits. These support member subunits are preferably stackable and releasably fastenable to one another. The fastening may be achieved using a male / female-type mechanical interface, such as interlocking flanges, keyed profiles, or similar engagement features that ensure secure axial alignment and structural integrity once assembled. This configuration enables the rotor to be assembled in stages, allowing it to be adapted in height or blade number as needed, and simplifies both initial installation and field replacement operations. The use of modular subunits across both the blade and support structures contributes significantly to the serviceability and scalability of the tidal power generating device. It reduces the complexity and cost of handling large integrated assemblies and supports a more flexible maintenance strategy in marine environments where downtime and accessibility are critical concerns. Moreover, this design enables customization of the rotor configuration for different site-specific flow conditions, making the device more adaptable and operationally efficient.

[0091] In one or more embodiments, the blades are mounted, preferably releasably mounted, to the cylindrical support member. Preferably, each blade comprises two or more blade subunits, preferably identical subunits. These configurations allow for an easier service of the tidal power generating device as parts may be more easily replaced when worn. Furthermore, it is easier to lift and assemble the tidal power generating device when smaller parts are used. In another embodiment, the cylindrical support member comprises two or more subunits, each with blade subunits mounted thereto. Preferably, these subunits are stackable and preferably releasably fastenable to one another. The subunits may e.g., be assembled via a male / female-type fastening means.

[0092] In one or more embodiments, the tidal power generating device is configured such that the cylindrical support member of the rotor unit is capable of moving vertically along the vertical support member of the base unit. This vertical mobility allows the rotor unit to adapt its operating position in response to changing water levels, flow conditions, or operational preferences. By enabling the rotor to be raised or lowered relative to the water surface, the device can maintain optimal submersion for energy production or be selectively submerged during periods of extreme weather or maintenance. The vertical support member is preferably significantly longer than the cylindrical support member to accommodate this range of movement. In some embodiments, the vertical support member is approximately 1.5, two, or even three times longer than the cylindrical support member, thereby offering sufficient clearance and support for controlled vertical travel.

[0093] To facilitate and regulate this movement, the system may incorporate buoyancy means, such as inflatable air units, which are operatively connected to the cylindrical support member. These buoyancy units assist in raising or lowering the rotor assembly by modifying its net buoyant force. The inflatable air units may be filled with varying ratios of air and water to achieve the desired lift or descent. Control over buoyancy is achieved by directing air or water into the lumen of the buoyancy chambers, either separately or as a controlled mixture. For instance, inflating the chambers with air increases buoyancy and raises the rotor, while allowing water to fill the chambers reduces buoyancy and lowers the rotor.

[0094] Each air unit is preferably equipped with valves adapted for controlling the inflow and outflow of air and / or water. These valves may be actively or passively operated and are designed to ensure precise control over the internal contents of the buoyancy units. A control unit may be included in the system to manage this inflation process. The control unit can receive input from sensors monitoring water level, tidal flow, or weather conditions, and use this information to automatically adjust the buoyancy of the rotor assembly.

[0095] In one advantageous scenario, if high water levels coincide with rough weather conditions unsuitable for energy generation, the control unit may instruct the inflatable air units to deflate, allowing the rotor unit to descend below the turbulent surface zone. This protective submersion helps reduce the risk of mechanical damage, fatigue, or performance loss during storm events, while allowing the rotor to resume operation once conditions normalize.

[0096] This buoyancy-assisted height-adjustment system enhances the resilience, adaptability, and efficiency of the tidal power generating device. By dynamically tuning the rotor’s vertical position, the system optimizes energy harvesting across varying tidal depths and improves survivability in harsh marine environments.

[0097] In one or more embodiments, the cylindrical support member is adapted for moving up and down the vertical support member, thereby allowing the rotor unit to adapt to a given water level. This movement may be aided by buoyancy means, such as inflatable air units, or air units where sea or river water, or air is pumped or directed into the lumen of the air units to adjust (e.g., with a mixture of water and air, water alone, or air alone) to the wanted buoyancy. The air units may be provided with valves adapted for controlling the flow of water and / or air into and / or out of the lumen thereof. The vertical support member may be relatively longer than the cylindrical support member, such as 1 .5 times longer, or two or three times longer, thereby supporting the cylindrical support member’s movement. A control unit may be present to regulate the level of inflation of the inflatable air units. If, at high water levels, the weather conditions are too rough for the operation of the tidal power generating device, the control unit may instruct the inflatable air units to deflate such that the cylindrical support member is submerged below the water level.

[0098] In one or more embodiments, the tidal power generating device is configured such that the rotor unit and / or the cover unit is adapted to float in water, either partially or fully. This buoyant configuration contributes to the ease of deployment, retrieval, and maintenance of the device, while also enabling adaptive positioning within the water column based on environmental or operational conditions.

[0099] To facilitate floatation, the rotor unit and / or the cover unit may be provided with integrated inflatable air chambers. These chambers are structurally incorporated into the components and are adapted to regulate buoyancy by controlling the volume and composition of the contents, typically air, water, or a combination thereof. The ability to inflate or deflate these chambers allows the device to adjust its vertical position in the water, enabling it to float at or near the surface during installation or transit and to submerge during operation or in response to environmental changes.

[0100] The blades, or in modular designs, the blade subunits, may themselves incorporate such inflatable air chambers. In some embodiments, the blades are configured entirely as inflatable chambers, formed from durable, flexible materials capable of maintaining structural integrity while submerged and subjected to hydrodynamic forces. This approach offers weight reduction and simplifies transport and assembly. Additionally, it provides a means of fine-tuning the buoyancy and rotational balance of the rotor unit.

[0101] The inflatable air chambers integrated into the rotor and / or cover unit may be controlled by a buoyancy management system, which may include valves, pumps, or air supply lines, as well as a control unit for automated operation. This system allows the buoyancy of each component to be independently adjusted, offering flexibility for operational optimization, rough-weather submersion, or emergency surfacing.

[0102] By enabling portions of the tidal power generating device to float, this design improves the modularity and deployability of the system, particularly in offshore or difficult-to-access locations. It reduces reliance on heavy lifting equipment during installation and allows portions of the system to be easily surfaced for inspection or repair. The integration of buoyancy features directly into load-bearing or energy-generating structures, such as the blades or cover, represents a functional enhancement that contributes to both the efficiency and maintainability of the overall system.

[0103] In one or more embodiments, the rotor unit and / or the cover unit is adapted for floating in water. E.g., the rotor unit and / or the cover unit may comprise inflatable air chambers adapted for regulating the buoyancy of the rotor unit and / or said cover unit. The blades, or blade subunits, may comprise such inflatable air chambers, or may be configured as inflatable air chambers.

[0104] In certain embodiments of the invention, the tidal power generating device is provided with a pivoting gate unit arranged within the cavity of the cover unit. This gate unit is designed to actively control the flow of water through the cavity in which the rotor unit is housed. By regulating the waterflow, the pivoting gate enhances the device’s ability to optimize energy generation, accommodate variable tidal conditions, and maintain operational stability.

[0105] The pivoting gate unit may comprise a generally flat surface, such as a plate section, which is mounted on a hinge and capable of tilting within a defined angular range. In preferred configurations, this surface is actuated using a piston unit, which may operate hydraulically or pneumatically, to enable precise control over the tilt angle of the gate. This actuation allows for real-time modulation of the waterflow entering and exiting the cavity.

[0106] To facilitate dynamic and adaptive operation, the device may include a control unit configured to manage the piston actuator in response to one or more operational parameters. These parameters may include, for example, the measured water flow rate, the generated electrical output of the device, or the current tilt angle of the pivoting gate. Sensor input is utilized by the control unit to make continuous adjustments to the gate position, thereby ensuring optimal flow characteristics within the cavity and around the rotor blades.

[0107] A particularly advantageous embodiment places the rotor unit toward one lateral side of the cavity formed by the cover unit, with the pivoting gate unit arranged on the opposite side. This creates an asymmetric internal flow channel, which can be actively managed by the gate to direct and shape the waterflow across the rotor unit. The result is improved efficiency in energy conversion, reduced turbulence, and enhanced responsiveness to shifting tidal directions or flow intensity.

[0108] This arrangement, featuring a pivoting gate within a rotatable, enclosed cover cavity, positioned opposite a laterally offset rotor unit and controlled in response to real-time operational data, offers technical benefits not found in known tidal energy systems. While prior art references such as US 2018 / 0023537 A1 and US 2019 / 0257281 A1 disclose flow-directing gates in general, they do not teach or suggest the present invention’s specific combination of structural layout, flow control mechanisms, and integrated dynamic feedback.

[0109] The invention goes beyond the mere inclusion of a gate in a turbine system. It presents a technically coherent solution that closely couples flow control with rotor positioning and real-time operational management. This results in a synergistic interaction between the mechanical and fluidic components of the device, enabling more effective adaptation to environmental conditions and improved energy generation performance.

[0110] In one or more embodiments, the tidal power generating device further comprises a pivoting gate unit arranged within the cover unit and adapted to control the waterflow through the cover unit. In one or more embodiments, the pivoting gate unit comprises a flat surface, such as a plate section, capable of tilting within a defined angle range, wherein said flat surface is hinged to allow for rotational movement.

[0111] In one or more embodiments, the pivoting gate unit comprises a piston unit with a hydraulic or pneumatic actuator configured for tilting a part, such as a plate section, of the pivoting gate unit, thereby controlling the waterflow through the cover unit.

[0112] In one or more embodiments, the pivoting gate unit further comprises a control unit configured to manage the piston unit’s extension and retraction, preferably in response to sensor input about water flow, energy production and / or tilt angle.

[0113] In one or more embodiments, the cylindrical support member is arranged at a side within the cover unit’s cavity, and wherein the pivoting gate unit is arranged opposite thereto.

[0114] In one or more embodiments, the rotor unit is arranged at a side within the cover unit’s cavity, and wherein the pivoting gate unit is arranged opposite thereto.

[0115] In one or more embodiments, the tidal power generating device comprises an integrated control and communication system adapted to manage and optimize the operation of its various functional components. The control system may be centralized or distributed and is preferably housed within a watertight enclosure positioned within the base unit, the vertical support member, or the cover unit.

[0116] The control system is operatively connected to one or more sensor units, which may include sensors for measuring water flow velocity and direction, tidal level, rotor rotation speed, generator output, gate angle, buoyancy chamber status, and environmental conditions such as wave height or turbulence. Sensor data is processed in real-time to dynamically adjust the position of the pivoting gate unit, the inflation state of buoyancy chambers, and the orientation of the cover unit, ensuring optimal energy capture and structural stability.

[0117] In preferred embodiments, the control system includes communication capabilities, enabling the device to transmit operational data to a shorebased or surface monitoring station. Communication may be established via underwater cables or wireless protocols such as acoustic telemetry or RF relays via surface buoys. This allows for remote supervision, diagnostics, and control adjustments.

[0118] Autonomous control routines may be embedded in the system software, allowing the device to respond independently to changing tidal conditions or emergency situations, such as deflating the buoyancy units to submerge the rotor during storms. The system may also log operational parameters for predictive maintenance and performance analytics.

[0119] The tidal power generating device is designed for deployment in a range of aquatic environments, including tidal estuaries, coastal regions, and riverine locations with steady current flow. Its modular and buoyant features allow it to adapt to different tidal ranges, water depths, and bottom conditions.

[0120] In shallow waters, the vertical support member may be shorter and directly anchored to the seabed or riverbed using driven piles or gravity bases. In deeper waters, suction caissons or moored tethering systems may be used to secure the base unit, with the vertical support member providing increased extension to accommodate the tidal range. The control unit may be configured to handle site-specific flow patterns, such as bidirectional tidal flows or unidirectional river currents. The device’s ability to rotate the cover unit and orient the inlet based on the direction of the flow enables consistent energy capture regardless of water direction. Additionally, the pivoting gate unit may be adjusted to compensate for local turbulence or flow obstruction.

[0121] Material selections for external structures may vary depending on environmental exposure, including the use of anti-fouling coatings, corrosion-resistant alloys, and UV-stable polymers for components exposed to sunlight in surface-floating configurations.

[0122] In one or more embodiments, the tidal power generating device includes a pivoting gate unit arranged within the cavity of the cover unit and adapted to regulate waterflow through the rotor-containing cavity. The pivoting gate may be positioned opposite the rotor unit, facilitating an asymmetric flow path that can be dynamically controlled to optimize turbine efficiency.

[0123] The gate unit may comprise a flat, hinged plate as previously described, but alternative configurations are also contemplated. In certain embodiments, the gate may be formed from a curved or contoured surface, such as a hydrofoil profile, to improve flow shaping. Additionally, the gate may be composed of multiple segmented panels that operate independently or in coordination, or it may include a flexible membrane that deforms under hydraulic or pneumatic actuation.

[0124] In one or more embodiments, the pivoting gate unit of the tidal power generating device may comprise a flexible membrane structure that is adapted to regulate the flow of water through the cavity of the cover unit. This configuration differs from rigid, hinged plate constructions by employing a deformable material that alters its shape in response to internal actuation forces or external hydrodynamic pressure. Through such deformation, the membrane selectively restricts or permits the passage of water across the rotor unit, thereby enabling precise and responsive flow control.

[0125] The membrane may be formed from a marine-grade elastomer, a reinforced textile, or a laminated composite material. These materials are selected to provide a balance between flexibility, mechanical durability, and resistance to corrosion and biofouling under prolonged exposure to seawater. The flexible membrane may be attached to an interior wall of the cover unit cavity using a fixed or deformable frame, such as a circular or elliptical ring. This mounting structure secures the membrane’s perimeter while permitting the central portion to flex inward or outward to modulate water passage.

[0126] Actuation of the membrane can be achieved by coupling it to a fluid- or airfilled chamber positioned behind or adjacent to the membrane surface. By introducing or removing air or water from this chamber, the membrane can be made to bulge into the flow path or retract toward the wall. In this manner, the membrane acts as a dynamic flow barrier, adjusting its shape to control velocity, turbulence, and flow distribution across the rotor blades. In some variations, the membrane may be entirely passive, relying on differential water pressure to deform naturally in response to changing tidal or flow conditions. The membrane’s geometry and material stiffness can be tuned so that it responds predictably to specific hydrodynamic loads.

[0127] To support intelligent control, one or more sensors may be positioned to monitor membrane displacement, internal chamber pressure, or surrounding water velocity. Sensor outputs may be interpreted by a control unit, which regulates the inflation state of the membrane by controlling pumps or valves. This closed-loop feedback enables the membrane to adapt to operational goals such as maintaining optimal rotor loading, mitigating turbulence, or responding to emergency events such as excessive wave impact or debris strikes.

[0128] The membrane may be removably mounted using clamping rings or modular attachment points to facilitate servicing, replacement, or inspection. To reduce maintenance frequency and improve performance, the surface of the membrane may be treated with anti-fouling agents or structured with textures that discourage biological growth and sediment accumulation.

[0129] This flexible membrane approach provides a low-weight, low-complexity alternative to traditional mechanical gates. Its ability to modulate flow continuously and resiliently under dynamic water conditions enhances the overall operational stability and efficiency of the tidal power generating device. Furthermore, its soft construction and deformability improve survivability in turbulent or debris-laden waters and offer distinct advantages in environments where mechanical simplicity and adaptability are paramount.

[0130] The gate may be mounted to any internal surface of the cavity, including the floor, sidewall, or ceiling, and may be installed on movable guide tracks to allow translational repositioning in addition to angular adjustment. This flexibility enables fine-tuning of flow dynamics based on specific environmental conditions.

[0131] Actuation of the gate may be managed through one or more hydraulic or pneumatic pistons, as well as electrically driven actuators. These may be governed by a control unit in response to real-time sensor data such as flow velocity, rotor loading, or cavity pressure. The gate unit may include locking mechanisms for securing it in a fixed position during maintenance or non- operational states.

[0132] To facilitate maintenance and inspection, the pivoting gate may be removably mounted or designed to be accessed through dedicated service ports. Components may be coated with wear-resistant materials or incorporate self-cleaning surfaces to reduce fouling and extend operational life.

[0133] By supporting a wide range of mechanical configurations, control options, and installation geometries, the pivoting gate unit enhances the versatility and robustness of the tidal power generating device. It serves as both a functional regulator of waterflow and a key component in the intelligent management of hydrodynamic forces within the energy-conversion cavity.

[0134] Referring to Figures 1-4, the general scheme of the invention is shown. Figure 1 is a perspective view of a tidal power generating device in accordance with various embodiments of the invention, and Figure 2 shows a cross-sectional view of the same tidal power generating device. Figures 3 and 4 show a front view and a rear view, respectively, of the same tidal power generating device.

[0135] In general, the tidal power generating device 100 comprises a base unit 110 adapted for anchoring into a seabed or riverbed, a rotor unit 120, an electrical generator 160 operatively connected to the rotor unit 120, a cover unit 130 rotatably mounted to the base unit 110, and a tail unit 140 mounted to the cover unit 130 and extending outwards therefrom.

[0136] The power generating device 100 is a tidal power generation system designed for efficient energy extraction from moving water, such as in tidal or river environments. The system is anchored securely to the seabed or riverbed via a base unit 110, which provides the necessary stability and structural support.

[0137] The device features a rotor unit 120 that harnesses the kinetic energy from water currents. The rotor unit 120, typically consisting of a series of blades, is designed to rotate as water flows through it, converting the energy of the moving water into mechanical energy. The rotor unit 120 is operatively connected to an electrical generator 160. As the rotor spins, it drives the generator, converting the mechanical energy into electrical energy, which can be transmitted to the grid or used locally. The most straightforward coupling between the rotor unit 120 and the electrical generator 160 involves a shaft (not shown) that directly connects the rotor unit to the electrical generator. When the rotor blades spin due to the water current, the rotational motion is transmitted through this shaft to the generator. The shaft is typically designed to handle high torque and is often made of materials that can withstand the harsh underwater environment, such as corrosion-resistant alloys. Bearings may be used at key points along the shaft to reduce friction and support smooth rotation, ensuring efficient energy transfer. In some designs, a gearbox may be placed between the rotor and the generator. The gearbox adjusts the rotational speed of the rotor to match the optimal input speed of the generator. For example, if the rotor turns slowly due to the relatively low speed of water currents, the gearbox can increase the rotational speed to a level that is more suitable for efficient electricity generation. Alternative designs use a direct drive system, where the rotor is directly coupled to the generator without a gearbox. This type of system reduces mechanical complexity and increases reliability since there are fewer moving parts. In a direct drive system, the generator is designed to operate efficiently at the slower speeds typical of the rotor. This often involves using permanent magnet generators, which are highly efficient at converting low-speed rotational motion into electricity. Sensors and control systems may be present to monitor the performance of the rotor-generator coupling. These systems can detect issues like misalignment, wear, or unusual vibrations, allowing for proactive maintenance and reducing downtime.

[0138] The system includes a cover unit 130 that is rotatably mounted to the base unit 110. This cover is built to enclose and protect the rotor unit 120 from debris and other potential damages while allowing optimal flow of water through the rotor. The rotatable mounting allows the cover unit to align with the direction of the water current, ensuring maximum efficiency. Hence, the cover unit serves several critical functions, ensuring the system’s efficiency, durability, and adaptability in harnessing energy from moving water. Primarily, it acts as a protective barrier for the rotor unit, safeguarding it from debris, marine organisms, and other potential damage caused by floating objects. This is especially important in tidal and river environments, where the flow of water can carry various materials that might otherwise impact the rotor blades or mechanical components. The cover is typically constructed from materials that are highly resistant to corrosion, such as marine-grade stainless steel, composites, or specially coated metals, ensuring longevity and durability in the harsh underwater environment.

[0139] In addition to protection, the cover unit may in general be designed to optimize hydrodynamic performance. A streamlined shape reduces drag and turbulence, allowing for smoother water flow around the rotor. This not only protects the rotor but also enhances energy capture efficiency by ensuring that the maximum amount of kinetic energy from the water is directed toward the rotor. Some cover designs may include integrated flow channels or ducts that help focus and accelerate the water flow as it approaches the rotor, improving energy conversion efficiency, especially in areas with lower current velocities. In a particularly preferred design (see Figures 8 and 9), the tidal power generating device comprises a pivoting gate unit arranged within the cover unit 130 and adapted to control the waterflow through the cover unit. The pivoting gate unit is here shown comprising a flat surface in the shape of a plate section 172, capable of tilting within a defined angle range. The plate section 172 is hinged to allow for rotational movement. A piston unit with a hydraulic actuator 174 is present to tilt the plate section, thereby controlling the waterflow through the cover unit 130. A control unit (not shown) is configured to manage the plate section’s 172 extension and retraction, preferably in response to sensor input about water flow, energy production and / or tilt angle.

[0140] The control system in this setup preferably relies on a network of sensors to monitor key parameters essential for optimizing the operation of the plate section 172 and ensuring efficient energy production. Central to this system are sensors that monitor the water flow, turbine energy production, and the tilt angle of the plate section.

[0141] Flow meters may be installed upstream of the plate section to measure the velocity and volume of water passing through the system. These sensors, which may include ultrasonic, electromagnetic, or mechanical flow meters, provide real-time data on the water flow rate. This information is continuously fed into the control unit, enabling it to assess how much to tilt the plate section to either increase or decrease the water flow towards the main turbine, i.e., the rotor unit 140.

[0142] Additionally, sensors may be arranged to monitor the electrical output of the electrical generator. Power meters measure the real-time electrical power generated by the turbine, while voltage and current sensors provide detailed readings on the electrical characteristics. RPM sensors, mounted on the turbine shaft, measure the rotational speed of the turbine, helping to correlate turbine speed with flow rate and energy production. The control unit uses this comprehensive data to adjust the deflector plate section’s position to optimize energy production. For instance, if the turbine’s output decreases, the control unit might tilt the plate section to direct more water towards the turbine, thereby compensating for the reduced flow. To ensure precise control of the plate section, tilt angle sensors, or inclinometers, may be attached to the plate section. These sensors measure the plate section’s angle relative to a reference position, typically vertical, providing the control unit with real-time information on the exact position of the plate section. The inclinometer feedback is crucial for maintaining the desired angle as calculated by the control system, ensuring that adjustments to the plate section’s position are accurate and preventing over-tilting or under-tilting.

[0143] All these sensors may work together, feeding data into the control unit, which then makes real-time decisions about the position of the plate section. The system’s algorithms balance the water flow, tilt angle, and turbine energy production to ensure the system operates at peak efficiency. This integrated approach allows the control system to adapt to varying water conditions, maintain stable operation, and maximize energy harvesting. Additionally, the control unit can log sensor data for analysis, enabling predictive maintenance and ongoing system optimization.

[0144] In the embodiment disclosed in Figures 8 and 9, the plate section 172 is provided with a second water turbine 176 that is configured to provide energy to the hydraulic actuator 174 via a hydraulic motor unit. The hydraulic piston in this system is powered by a hydraulic motor unit, which converts hydraulic energy into mechanical force to control the piston’s movement. The hydraulic motor is connected to a pressurized fluid system, where fluid is supplied through a pump. This fluid exerts pressure on the piston, driving it to extend or retract based on the system’s needs.

[0145] When the control unit signals the need to adjust the position of the plate section 172, it activates the hydraulic motor unit. The motor then directs pressurized hydraulic fluid into the piston cylinder, causing the piston to either extend or retract. If the plate section 172 needs to tilt towards the rotor unit 120, the hydraulic motor drives the fluid to extend the piston, pushing the plate section 172 into position. Conversely, if the plate section 172 needs to be tilted further away from the rotor unit 120, the hydraulic motor retracts the piston by reversing the fluid flow, allowing the plate section 172 to open up and increase the water flow path.

[0146] The hydraulic motor’s responsiveness is essential for controlling the position of the plate section 172 precisely and efficiently. By using hydraulic fluid to power the piston, the system benefits from a high degree of control, even under varying water pressure conditions. Additionally, the hydraulic motor allows for smooth adjustments in the plate section’s 172 position, ensuring that the flow of water is continuously optimized for maximum energy capture. The motor’s power and torque can be easily controlled, providing the necessary force to move the piston without requiring large amounts of electrical energy, making it ideal for this kind of application. The second water turbine 176 is here shown extending all the way along the tip of the plate section 172. In general, other configurations may also be possible, where multiple water turbines are positioned at the tip, or a single water turbine only covering a part of the width of the tip of the plate section 172. This approach would take advantage of the water flow already passing through the system to generate the energy needed to operate the hydraulic motor, making the system more self-sufficient and reducing reliance on external power sources.

[0147] Preferably, the second water turbine would be mounted at the tip of the plate section 172, where the water flow is most concentrated as it is directed towards the main energy-harvesting turbine 120. As water flows past or over the plate section 172, it drives the second water turbine 176, converting the kinetic energy of the moving water into mechanical energy. This mechanical energy is then transferred to the hydraulic pump, which generates pressurized hydraulic fluid to power the hydraulic motor.

[0148] When mounted at the tip of the plate section 172, the second water turbine 176 could also function as a sensor to detect and measure water flow. This dual-purpose setup offers an efficient way to monitor real-time flow conditions while simultaneously generating energy to power the hydraulic motor. The relatively smaller second water turbine 176, placed at the tip of the plate section 172 where water flow is most concentrated, spins in response to the water velocity. By measuring the rotational speed of the second water turbine, which is directly proportional to the water flow rate, the system can obtain real-time data on the intensity of the water flow. A tachometer or similar sensor integrated into the turbine assembly could be used to measure the turbine’s rotational speed, converting this information into flow rate data.

[0149] This data would be sent to the control unit, allowing the system to adjust the plate section’s 172 position based on the flow. For instance, if the turbine detects a strong flow (indicated by a high rotational speed), the control unit can respond by retracting the piston to tilt the plate section 172 back and increase the flow path. Conversely, if the flow weakens, the control unit can signal the hydraulic motor to extend the piston, tilting the plate section 172 forward to concentrate the flow and maintain energy production.

[0150] In the disclosed embodiment, the cylindrical support member 124 is arranged at a side within the cover unit’s cavity, and the pivoting gate unit is arranged opposite thereto.

[0151] One of the key features of the cover unit 130 is its ability to rotate, allowing it to pivot around the vertical axis of the support member 124. This rotation enables the cover to align with the direction of the water current automatically. The cover unit 130 is connected to a tail unit 140, which acts like a vane to detect the direction of the water flow. The tail unit extends outward from the cover and uses the force of the current to orient the entire cover unit and rotor toward the optimal angle for energy capture. As the water flow direction changes, for instance, due to tidal shifts, the cover unit smoothly rotates to maintain the ideal orientation.

[0152] The cover unit 130 also plays a structural role, providing internal support that ensures the rotor remains properly aligned with the water flow, even as the cover rotates. It is securely mounted to the vertical support member, preferably through a bearing system, allowing for free rotation while maintaining connection to the base unit. The bearings are designed to handle both the rotational forces, and the environmental pressures encountered underwater. To facilitate maintenance, the cover unit may feature a hinged or modular design, allowing easy access to the rotor and internal components for inspection, cleaning, or repair. Additionally, inspection ports or hatches might be included to allow visual checks of the rotor and internal mechanisms without needing to disassemble the entire unit.

[0153] In general, the materials used in the construction of the cover unit 130 are chosen for their ability to withstand long-term exposure to seawater, mechanical stress, and biological fouling. Commonly used materials include marine-grade stainless steel, advanced composites, or high-density polyethylene (HDPE). To maintain hydrodynamic efficiency and prevent the growth of marine organisms, such as barnacles or algae, anti-fouling coatings are often applied to the cover unit. These coatings help to maintain the performance of the device by preventing the alteration of water flow and the increase of drag due to biological buildup.

[0154] A tail unit 140 is attached to the cover unit 130 and extends outward. This tail unit functions similarly to a weathervane, automatically orienting the cover unit 130 in line with the prevailing water currents. This ensures that the rotor is always optimally positioned to capture the maximum amount of energy from the moving water.

[0155] The base unit 110 comprises a vertical support member 112 (see Figures 6 and 7), and the rotor unit 120 comprises a cylindrical support member 124 (see Figure 6) rotatably mounted around the vertical support member 112. A plurality of blades 123 (here, ten blades are exemplary shown) are releasably mounted to the cylindrical support member 124. Each blade 123 is composed of a plurality of blade subunits 122, here exemplified with a composition of four blade subunits 122A-D.

[0156] The cover unit 130 is adapted for covering the cylindrical support member 124 (see Figure 2), including the blades 123. The cover unit 130 comprises a cavity 132 (see Figure 5) adapted for containing the cylindrical support member 124 and the blades 123. Furthermore, the cover unit 130 comprises an inlet 134 adapted for directing water into the cavity 132 of the cover unit 130 towards the blades 123, and an outlet 136 adapted for directing water away from the blades 123 and cavity 132.

[0157] The tail unit 140 is also shown in a tubular configuration with a first end 152, and an opposite second end 154, and comprising wall sections 142 with a plurality of holes 144 formed therein, the latter primarily to regulate the water flow through the outlet 136 of the cover unit 130. In general, and as shown in Figures 8 and 9, the tail unit 140 may be tubular and conical in shape, with its narrow end connected to the cover unit 130 and the wider end extending outward, away from the cover unit 130. This conical structure is designed to provide stability and act like a vane, helping the entire system align with the direction of the water flow. The tapered, streamlined shape of the tail minimizes drag, while its broad, wider end enhances its ability to catch the flow of water effectively, ensuring that the cover unit rotates smoothly to maintain optimal alignment with the prevailing current. Furthermore, this configuration would naturally cause the water flowing through it to slow down as it exits. As water enters the narrower end near the cover and moves through the widening tail, the increasing cross- sectional area allows the flow to expand, reducing its velocity. This design helps manage the water’s energy, ensuring a smooth exit from the system and reducing turbulence behind the device, which can enhance the overall stability of the structure and minimize downstream impacts on the water environment.

[0158] A head unit 150 is also shown mounted to the cover unit 130 and extending outwards therefrom. The head unit 150 is of an extension substantially less than the tail unit 140, to avoid counteracting the function of the tail unit, which is to direct the inlet 134 towards the water stream. The tail unit 140 is mounted to the cover unit 130, opposite to the inlet 134, and extends outwards therefrom. The head unit 150 is flanking the inlet 134 and is adapted for directing water into the same. The head unit 150 is tubular with a first end 152, and an opposite second end 154. The head unit 150 is shown with a grid 156 mounted in front of the second end 154 and adapted for preventing larger animals from entering the head unit 150.

[0159] In general, the base unit 110 may take the shape of many different configurations suitable for anchoring into a seabed or riverbed. Here (see Figures 6 and 7), the base unit 110 is configured with a plurality of anchor arms 114 connected to anchor bodies 116 (here exemplified with six pairs). The anchor bodies 116 may be configured with a cavity adapted for receiving sand from the seabed or riverbed, thereby allowing the base unit 110 to be flushed / washed into the seabed or riverbed. In other embodiments, the anchor bodies 116 may be constructed of concrete, stainless steel, or another relatively heavy material. References

[0160] 100 Tidal power generating device

[0161] 110 Base unit

[0162] 112 Support member

[0163] 114 Anchor arm

[0164] 116 Anchor body

[0165] 120 Rotor unit

[0166] 122 Blade subunit

[0167] 123 Blade

[0168] 124 Support member

[0169] 130 Cover unit

[0170] 132 Cavity

[0171] 134 Inlet

[0172] 136 Outlet

[0173] 140 Tail unit

[0174] 142 Wall section

[0175] 144 Hole

[0176] 146 First end

[0177] 148 Second end

[0178] 150 Head unit

[0179] 152 First end

[0180] 154 Second end

[0181] 156 Grid

[0182] 160 Electrical generator

[0183] 172 Plate section

[0184] 174 Hydraulic actuator

[0185] 176 Second water turbine

Claims

Claims1 . A tidal power generating device (100) comprising:- a base unit (110) adapted for anchoring into a seabed or riverbed;- a rotor unit (120) comprising a plurality of blades (122) arranged in a circumferential direction;- an electrical generator (160) operatively connected to the rotor unit (120); wherein the base unit (110) comprises a vertical support member (112), and wherein the rotor unit (120) comprises a cylindrical support member (124) rotatably mounted around said vertical support member (112), wherein said plurality of blades (123) are mounted to or formed in said cylindrical support member (124);- a cover unit (130) rotatably mounted to said base unit and adapted for at least partly covering said cylindrical support member (124) including said plurality of blades (123), wherein said cover unit (130) comprises a cavity (132) adapted for containing said cylindrical support member (124) including said plurality of blades (123), said cover unit (130) comprising an inlet (134) adapted for directing water into the cavity (132) of said cover unit (130) and an outlet (136) adapted for directing water away from the cavity (132) of said cover unit (130);- a tail unit (140) mounted to said cover unit (130) and extending outwards therefrom, wherein the tail unit (140) is positioned opposite to the inlet (134) of said cover unit (130); and- a pivoting gate unit arranged within the cover unit (130) and adapted to control the waterflow through the cover unit (130).

2. The tidal power generating device (100) according to claim 1 , wherein the pivoting gate unit is adapted to control and direct the waterflow toward the rotor unit (120) within the cavity (132) of the cover unit (130), thereby regulating the velocity and orientation of the water impacting the rotor blades (123).

3. The tidal power generating device (100) according to any one of the claims 1-2, wherein the pivoting gate unit comprises a flat surface, such as a plate section (172), capable of tilting within a defined angle range, wherein said flat surface is hinged to allow for rotational movement.

4. The tidal power generating device (100) according to any one of the claims 2-3, wherein the pivoting gate unit comprises a piston unit with a hydraulic or pneumatic actuator (174) configured for tilting a part, such as a plate section (172), of the pivoting gate unit, thereby controlling the waterflow through the cover unit.

5. The tidal power generating device (100) according to claim 4, wherein the pivoting gate unit further comprises a control unit configured to manage the piston unit’s extension and retraction in response to sensor input about water flow, energy production and / or tilt angle.

6. The tidal power generating device (100) according to any one of the claims 2-5, wherein the rotor unit (120) is arranged at a side within the cover unit’s cavity (132), and wherein the pivoting gate unit is arranged opposite thereto.

7. The tidal power generating device (100) according to any one of the claims 1-6, wherein the tail unit (140) is tubular, such as conical, and configured as an extension of the outlet (136) of said cover unit (130).

8. The tidal power generating device (100) according to any one of the claims 1 -7, further comprising a head unit (150) mounted to said cover unit (130) and extending outwards therefrom, wherein the head unit (150) is of an extension substantially less than the tail unit (140), wherein the head unit (150) is adapted for flanking the inlet (134) of said cover unit (130), andfor directing water into the inlet (134) of said cover unit (130).

9. The tidal power generating device (100) according to claim 8, wherein the head unit (150) is tubular and configured as an extension of said inlet (134).

10. The tidal power generating device according to any one of the claims 1- 9, wherein said plurality of blades (123) are mounted to said cylindrical support member (124), and wherein each blade (123) comprises two or more identical subunits (122).11 . The tidal power generating device (100) according to claim 10, wherein said cylindrical support member (124) comprises two or more stackable subunits, each having one or more blade subunits (122) mounted thereto.

12. The tidal power generating device (100) according to claim 11 , wherein said stackable subunits are releasably fastenable to one another, preferably using a male / female-type mechanical connection.

13. The tidal power generating device (100) according to any one of the claims 1-12, wherein the cylindrical support member (124) is adapted for vertical movement along the vertical support member (112), thereby allowing the rotor unit (120) to adjust its vertical position in the water.

14. The tidal power generating device (100) according to claim 13, further comprising one or more buoyancy units operatively connected to the cylindrical support member (124), said buoyancy units being adapted to raise or lower the rotor unit (120) by adjusting the buoyancy.

15. The tidal power generating device (100) according to claim 14, wherein said buoyancy units comprise inflatable air chambers configured to receiveair and / or water to vary their buoyancy, and wherein the buoyancy units are provided with valves for controlling the flow of air and / or water.

16. The tidal power generating device (100) according to claim 15, further comprising a control unit adapted to regulate the inflation state of the inflatable air chambers in response to environmental data, such as water level or weather conditions.

17. The tidal power generating device (100) according to any one of the claims 1-16, wherein the rotor unit (120) and / or the cover unit (130) comprises one or more inflatable air chambers adapted to regulate the buoyancy of the rotor unit (120) and / or the cover unit (130).

18. The tidal power generating device (100) according to claim 17, wherein the blades (123) or blade subunits (122) comprise inflatable air chambers, or are configured as inflatable air chambers.

19. The tidal power generating device (100) according to any one of the claims 8-9, wherein the head unit (150) comprises a grid mounted within or in front of its opening, said grid being configured to prevent large marine animals from entering the head unit (150) and the cavity (132) of the cover unit (130).

20. The tidal power generating device (100) according to any one of the claims 1-19, wherein the electrical generator (160) is housed within the vertical support member (112) of the base unit (110).21 . The tidal power generating device (100) according to any one of the preceding claims, further comprising a control system operatively connected to one or more sensors adapted to measure water flow velocity, rotor speed, tidal level, or generator output.

22. The tidal power generating device (100) according to claim 21 , wherein the control system is configured to adjust the pivoting gate unit or buoyancy means based on real-time sensor input.

23. The tidal power generating device (100) according to any one of the claims 21-22, wherein the control system includes communication means for transmitting operational data to a remote monitoring station.

24. The tidal power generating device (100) according to any one of the claims 21-23, wherein the control system includes autonomous routines configured to submerge the rotor unit during adverse weather conditions.

25. The tidal power generating device (100) according to any one of the preceding claims, wherein the base unit is adapted for deployment in either shallow or deep water environments and includes anchoring means selected from piles, gravity bases, suction anchors, or mooring tethers.

26. The tidal power generating device (100) according to any one of the preceding claims, wherein the material composition of the rotor unit, cover unit, or base unit includes anti-corrosion coatings or marine-grade polymers adapted to resist biofouling and saltwater exposure.

27. The tidal power generating device (100) according to any one of the preceding claims, wherein the cover unit is configured to rotate around the base unit in response to water flow direction, optionally under control of the control unit.

28. The tidal power generating device (100) according to any one of the preceding claims, wherein the device is configured to operate in either tidal or riverine flow conditions.

29. The tidal power generating device (100) according to any one of claims 1-28, wherein the pivoting gate unit comprises a curved or contoured surface adapted to direct waterflow in a hydrodynamically optimized manner.

30. The tidal power generating device (100) according to any one of claims 1-29, wherein the pivoting gate unit comprises a flexible membrane adapted to deform under hydraulic or pneumatic pressure to control waterflow through the cover unit (130).31 . The tidal power generating device (100) according to any one of claims 1-30, wherein the pivoting gate unit comprises a plurality of gate panels arranged to operate independently or in coordination to regulate waterflow.

32. The tidal power generating device (100) according to any one of claims 1-31 , wherein the pivoting gate unit is mounted to an internal surface of the cover unit (130), selected from a floor, sidewall, or roof of the cavity (132).

33. The tidal power generating device (100) according to any one of claims 1-32, wherein the pivoting gate unit is arranged to be movable along a guide track within the cavity (132), thereby allowing translational repositioning in addition to angular movement.

34. The tidal power generating device (100) according to any one of claims 1-33, wherein the pivoting gate unit comprises a locking mechanism adapted to hold the gate in an open or closed position during maintenance or non-operational conditions.

35. The tidal power generating device (100) according to any one of claims 1-34, wherein the pivoting gate unit is removably mounted to facilitateinspection, replacement, or maintenance.

36. The tidal power generating device (100) according to any one of claims 1-35, wherein at least a portion of the pivoting gate unit is coated with a wear-resistant or self-cleaning material to reduce fouling and extend operational life.

37. The tidal power generating device (100) according to any one of the preceding claims, wherein the pivoting gate unit comprises a flexible membrane configured to deform in response to fluid or air pressure to control waterflow through the cover unit (130).

38. The tidal power generating device (100) according to claim 37, wherein the flexible membrane is operatively connected to a fluid chamber, and wherein deformation of the membrane is controlled by introducing or removing air and / or water from said chamber.

39. The tidal power generating device (100) according to claim 38, further comprising one or more valves or pumps adapted to regulate the flow of air and / or water into or out of the fluid chamber to adjust the shape of the flexible membrane.

40. The tidal power generating device (100) according to any one of claims 37-39, wherein the flexible membrane is formed from a marine-grade elastomer, reinforced textile, or laminated composite material.41 . The tidal power generating device (100) according to any one of claims 37-40, wherein the flexible membrane is removably mounted within the cavity (132) of the cover unit (130) to allow for inspection or replacement.

42. The tidal power generating device (100) according to any one of claims37-41 , further comprising a sensor configured to monitor membrane displacement or internal pressure, wherein the control unit is adapted to adjust the membrane deformation based on sensor data.

43. The tidal power generating device (100) according to any one of claims 37-42, wherein the flexible membrane includes a self-cleaning surface texture or anti-fouling coating to reduce biological growth and sediment accumulation.

44. The tidal power generating device (100) according to any one of claims 37-43, wherein the flexible membrane is configured to deform passively in response to hydrodynamic forces acting on the membrane surface.

45. The tidal power generating device (100) according to any one of the preceding claims, wherein the pivoting gate unit is adapted to control and direct waterflow toward the rotor unit (120) within the cavity (132) of the cover unit (130), thereby influencing the velocity and orientation of the water impacting the rotor blades (123).

46. The tidal power generating device (100) according to any one of the preceding claims, wherein the pivoting gate unit is positioned opposite the rotor unit (120) within the cavity (132) of the cover unit (130) and is adapted to asymmetrically shape and direct waterflow toward the rotor unit (120) to enhance fluid impact on the rotor blades (123).

47. The tidal power generating device (100) according to any one of the preceding claims, wherein the pivoting gate unit is adjustably positionable within the cavity (132) of the cover unit (130) to variably control the angle and distribution of waterflow directed asymmetrically toward the rotor unit (120), thereby enabling fine-tuned flow shaping across varying tidal conditions.

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