22 results about "Negative buoyancy" patented technology

The present invention relates to a submersible solar device, comprising: a solar cell panel; at least one buoyancy body connected to the solar panel; wherein the solar cell panel and the at least one buoyancy body have positive buoyancy at the water surface of the water body; the diving device is suitable for applying negative buoyancy to the submersible solar device; wherein the at least one buoyancy body comprises a reversibly compressible first buoyancy body. The invention also relates to the use of the submersible solar system for generating electrical energy, to a transport system for a submersible solar device, and to the use of the transport system.

The present invention relates to an auxiliary recovery system and recovery method for underwater rocket-powered vehicles, belonging to the technical field of underwater vehicle marine test recovery. The system includes a jettisoning mechanism for separating a jettisonable nose section from a recovery position-indicating section to jettison the jettisonable nose section, a parachute ejection device for ejecting a parachute inside the system out of the recovery position-indicating section to open the parachute, a smoke generator for emitting smoke for easy identification, a satellite position-indicating device for locating the rocket-powered vehicle's position at sea, a sensor assembly for acquiring the water depth, speed, and attitude information of the rocket-powered vehicle and transmitting it to a control module, and a recovery control module for issuing corresponding instructions to the jettisoning mechanism, the parachute ejection device, the smoke generator, and the satellite position-indicating device based on information fed back by the sensor assembly. Based on this system, rapid recovery of a negatively buoyant underwater rocket-powered vehicle with a speed exceeding 80 knots can be achieved with high recovery reliability.

The utility model relates to the technical field of underwater robots, in particular to a propeller composite wheel with a convertible underwater motion state for an observation and maintenance robot. A propeller outer wheel is installed outside the pressure-resistant hub, a buoyancy adjusting device is installed between the propeller outer wheel and the pressure-resistant hub, a sealing partition plate is installed in an inner cavity of the pressure-resistant hub, air holes are formed in the surface of the pressure-resistant hub, the buoyancy adjusting device is communicated with the first sealed cabin through the air holes, and an exhaust pump is installed in the first sealed cabin; a driving motor is mounted in the second sealing chamber, gas between the buoyancy adjusting air bag and the first sealing chamber in the pressure-resistant hub is exhausted through the exhaust pump, the size of the buoyancy adjusting air bag is changed, and rapid and repeated adjustment of'zero buoyancy-negative buoyancy 'of the propeller composite wheel is achieved. The underwater robot can be used as a propeller, a roller and a walking foot so as to adapt to a complex underwater operation environment, so that underwater observation and maintenance operation are completed, and the environment adaptability is high.

The present invention relates to a submersible photovoltaic power generation system equipped with a device for achieving a floating state at a predetermined diving depth. The submersible photovoltaic power generation system comprises a photovoltaic panel, at least one buoyancy device connected to the photovoltaic panel, and a diving means capable of applying negative buoyancy to the photovoltaic power generation system. The at least one buoyancy device comprises a first buoyancy device that is at least partially reversibly compressible. The present invention further relates to the use of a submersible photovoltaic power generation system for generating electrical energy, a transport system for a submersible photovoltaic power generation system, and the use of a transport system.

The utility model relates to the technical field of underwater robots, in particular to a motion state change device for an underwater observation and maintenance robot. The propeller composite wheel is installed at one end of the composite wheel position conversion device, and the other end of the composite wheel position conversion device is installed on a main body frame of the robot. The outer edge of the propeller composite wheel adopts a blade design, the propeller composite wheel can be used as a propeller, a roller and a walking foot under the action of a driving motor and a speed reducer, and a mounting bracket rotates in a horizontal plane by driving an outer rotor II; the outer rotor I is driven to enable the composite wheel position conversion device to rotate in a vertical plane relative to the assembly mounting and fixing flange, so that the position of the propeller composite wheel in the robot is changed, and the composite wheel position conversion device is matched with the propeller composite wheel for use to realize rapid and repeated adjustment of'zero buoyancy-negative buoyancy 'of the propeller composite wheel; change of floating / crawling / walking state switching of the robot is the core of state switching and walking functions of the robot.

A submersible dredging vessel having a hydrodynamic body optimised for energy-efficient underwater movement. The vessel comprises four primary propulsion units, each incorporating a pump. The vessel has negative buoyancy, causing it to sink when not powered. The vessel comprises a dredging pump arranged to dredge and to control the vertical location in a body of water. The dredging pump can operate in three modes: sink, stable, and rise. In sink mode, the downward force exceeds upward forces, causing descent. Stable mode balances forces, maintaining a constant depth, while rise mode increases upward force to ascend.

The present invention introduces an innovative process for constructing large-scale megastructures, such as expansive domes, leveraging an adjustable height work platform that eliminates the need for heavy-duty cranes. The adjustable work platform, built upon floating foundation blocks, such as those detailed in patent application Ser. No. 18 / 765,120, is placed in a water body, enabling an efficient and cost-effective method of vertically expanding the platform's height during construction. The process begins with constructing the structure's apex on the platform, which is then elevated as necessary through the addition of negatively buoyant lifting blocks underneath the existing platform.The elevation of the platform is achieved by discharging high-pressure air into the new blocks' water compartments, forcing water out and increasing their buoyancy. This mechanism raises the entire platform according to the combined carrying capacity of the new layer of blocks. Simultaneously, the developing structure is elevated, creating room for further structural expansion.This top-down construction approach allows for maintaining a constant relative height between the platform and the structure above, negating the need for large-scale cranes. Small systems suffice for the vertical transportation of materials and personnel among different sections, ensuring a safe working environment. Once the construction is complete, the platform's removal involves gradually reducing the buoyancy of the blocks, starting from the bottommost layer, thereby lowering the platform and distancing it from the structure's ceiling. The blocks' air is bled out to allow water re-entry, making them sink, thus achieving the platform's step-by-step descent.Following the platform's removal, the final stages of construction are executed, and the structure is handed over to the owner. If designed to rest on land, the structure is positioned on a fixed foundation with a temporary deep pool for the block levels. Conversely, if intended to be floating, the structure rests on a remaining platform robust enough to support it. The floating design affords the possibility of towing the structure to various locations, offering an unprecedented level of mobility and versatility for megastructures.

The invention provides an amphibious submersible, and relates to the technical field of underwater robots. The amphibious submersible comprises an electronic cabin; the pair of crawling crawlers are arranged on the left side and the right side of the electronic cabin correspondingly and used for achieving bottom-attaching crawling of the amphibious submersible underwater. A support frame; the pair of battery cabins is used for providing power support; a propulsion system; the buoyancy adjusting mechanism is used for adjusting the overall buoyancy of the amphibious submersible, so that the amphibious submersible works in a zero-buoyancy floating working mode or a negative-buoyancy crawling working mode; the communication positioning system is used for communicating with shore equipment and positioning the amphibious submersible; and the control system is used for realizing navigation and operation of the amphibious submersible according to a preset program and / or receiving a real-time control signal of the shore equipment. The floating mode and the crawling mode are switched through the buoyancy adjusting mechanism, multi-scene requirements are met, autonomous control and optical fiber real-time control are compatible, and large-range autonomous operation and high-precision remote control are both considered.

The invention provides a floating state compensation device and method for an underwater unmanned vehicle, and belongs to the technical field of underwater unmanned vehicles. The floating state compensation device comprises an air bag assembly, a compensation control cabin, a high-pressure air cylinder and an air pressure pipeline; the high-pressure gas cylinders are connected with the compensation control cabin through gas pressure pipelines, and the compensation control cabin is connected with the two gas bag assemblies through gas pressure pipelines. The air bag assembly comprises an air bag protection shell, N water permeable holes are formed in the air bag protection shell, and an air bag is arranged in the air bag protection shell; after the floating state compensation device receives a floating state compensation instruction, the compensation control cabin is converted into an exhaust state from a normally-closed state, so that gas in the air bag is quickly exhausted into the high-pressure gas cylinder through the air pressure pipeline, and quick floating state compensation is performed on the lost negative buoyancy after the load of the unmanned underwater vehicle is released. The floating state compensation device for the unmanned underwater vehicle has the advantages of being compact in overall structure, low in device self weight, good in stability control, capable of being repeatedly used, high in adaptability and the like.

The application relates to a device and a method for sequestering carbon dioxide (CO2) in a container (5) placed at the bottom of a body of water (2) at a sufficient depth to maintain the carbon dioxide in the liquid state. The container (5) is connected by a pipe (4) to a source (3) of carbon dioxide for filling the container. The container can advantageously be connected to a platform (1) which allows it to be lowered into the body of water (2) and can be provided with a ballast so that the assembly has negative buoyancy.

A system for inspecting the condition of a conduit while fluid is flowing in the conduit includes an inspection apparatus and a retrieval unit insertable into the conduit for catching the apparatus and removing the apparatus from the conduit. The inspection apparatus includes first and second chambers interconnected together in spaced apart relationship, one of the chambers is positively buoyant and the other chamber is negatively buoyant. Sensing devices to detect and sense physical parameters of at least one of the fluid and the conduit are disposed within at least one of the first and second chambers. The retrieval unit includes a catchment device shaped to capture the apparatus and a deployment device to deploy the catchment device to be in position to catch the inspection apparatus. Once the inspection apparatus is caught, the deployment device removes the inspection apparatus from the conduit.

According to the technical scheme, the depth setting device is characterized by comprising a lower anchor system, and the lower anchor system has negative buoyancy in seawater; the underwater equipment has positive buoyancy in seawater, and the underwater equipment is connected with the lower anchor system through a mooring rope; the control system is used for controlling the unwinding speed of the mooring rope between the underwater equipment and the lower anchor system; the control system comprises a control cabin; a winch; a hydraulic motor; two oil inlets and outlets of the hydraulic motor are communicated with the oil tank through two connecting pipelines; the depth sensor is arranged at the underwater equipment and is used for measuring the water depth of the underwater equipment; and an electromagnetic proportional flow valve; through the arrangement of the electromagnetic proportional valve, the cable laying speed can be adjusted according to the depth of the underwater equipment, and then the lowering of the fixed speed of the lower anchor system is controlled, and the water depth of the underwater equipment is controlled to be kept stable.

Underground facilities built for storing electric energy in the form of gravity and buoyant energy are described herein. In one embodiment, the facility is disposed in a thixotropic fluid beneath the ground surface and houses water to maintain a positive buoyancy and a piston having a bulk density greater than the water. In another embodiment, the underground facility is configured as a buoyant capsule arranged in a cylinder filled with water, where the cylinder is sealed except for openings in a bottom half of the cylinder to allow near unimpeded water flow from a location inside to a location outside of the cylinder. In another embodiment, the underground facility is configured as a negatively buoyant capsule.

A method of installing a subsea riser includes placing an elongate negatively-buoyant support on the seabed and, when laying the riser on the seabed, guiding a riser portion onto the support to extend along and be cradled by the support. A hogbend region of the riser is then formed by conferring positive buoyancy on the support to lift the support and the riser portion away from the seabed. An element of the support includes a riser support disposed in a longitudinally extending open-ended gap between buoyancy volumes disposed on opposite sides of the gap. Coupling formations such as hinge portions can couple the element to a like element. When so coupled, the gaps of those elements align to define an upwardly opening, longitudinally extending groove to receive the riser.

This invention relates to the field of buoy platform control, and discloses a comprehensive buoyancy adjustment method and device for a buoy platform. The buoy platform achieves rapid sinking due to negative buoyancy by using a load-bearing counterweight and rapid surfacing due to positive buoyancy by jettisoning weights and piston movement. When the buoy reaches a preset depth, the inflated airbags provide auxiliary buoyancy, ensuring rapid surfacing and raising the antenna compartment to a certain height above the water. A wave-resistant device opens under the inflated airbags, providing some wave resistance. When the buoy platform needs to dive, the airbag system retracts the inflated airbags, and the wave-resistant device retracts under the action of a torsion spring, maintaining its shape and reducing drag. Fine buoyancy adjustment is performed via a piston, allowing the buoy platform to reach the designated depth. This invention simplifies the system structure and achieves efficient and reliable operation of the buoy platform across all mission profiles through the organic combination of multiple buoyancy adjustment methods and a reasonable mechanical linkage design.

The invention discloses a three-dimensional porous negative buoyancy jet transient flow direct numerical simulation prediction method. The prediction method comprises the following steps: determining a three-dimensional porous negative buoyancy jet transient control equation; constructing a physical information neural network; acquiring multiple groups of multi-working-condition experimental data as a sample data set; inputting the sample data set into a physical information neural network model for training to obtain the total loss of the sample data in the neural network model, and adjusting and optimizing hyper-parameters of the neural network by taking the minimum loss calculated by a loss function as a target to obtain a trained physical information neural network; to-be-simulated space coordinates and prediction time are input into the trained physical information neural network, key parameters representing negative buoyancy jet flow characteristics are obtained, and therefore the transportation mechanism and entrainment mixing characteristics of the negative buoyancy jet flow characteristics are studied. According to the method, meshless solution can be realized, the grid dependence of a traditional method is avoided, the calculation efficiency is improved, and the method is suitable for the buoyancy-driven flow problem of multi-physics field coupling.

A planar sensor array includes a center tube, a first group of tubes, and a second group of tubes. One or more of the first group of tubes is positively buoyant, and at least one of the second group of tubes is negatively buoyant. Adjacent tubes are joined together by hinges. Acoustic sensors are positioned within the tubes. First and second half-shells are connected to the most distal tube of each group. The first half-shell is positively buoyant, and the second half-shell is negatively buoyant. An actuator attached to said center tube, and fins are attached to the actuator. The actuator is adjustable to change the fins angle of attack. Environmental fluid flow over the fins induces a torque on the actuator and center tube and causes these components to rotate. Rotation of the center tube causes the first and second groups of tubes to wrap around the center tube.

This invention relates to the field of airship technology and discloses a low-energy safe airship, including a main airbag, a propulsion system, and a control system. The main airbag is filled with buoyancy gas, and the total buoyancy of the entire aircraft is less than its total weight, with a ratio of 80% to 99.9%. The propulsion system compensates for the difference between buoyancy and weight, enabling hovering, ascent, descent, and level flight attitude control. This invention employs a micro-negative buoyancy design, causing the entire aircraft to naturally tend to slowly sink, preventing it from drifting upwards on its own. This reduces the risk of loss of control due to over-limit expansion, cable breakage, or drift. The multi-compartment airtight redundancy design ensures that if any compartment is damaged, the remaining compartments can maintain their original buoyancy, making the overall buoyancy loss controllable. Combined with the propulsion system, this allows for a smooth descent, reducing the risk of rapid descent. The fully enclosed heat-insulating and temperature-controlled structure can suppress the expansion of internal gases due to solar radiation.

A submersible solar installation is provided, the installation comprising a solar panel; at least one buoyancy body connected to the solar panel; wherein the solar panel and the at least one buoyancy body are designed to have a positive buoyancy at a water surface of a body of water; and a diving element adapted to subject the submersible solar installation to a negative buoyant force; wherein the at least one buoyancy body includes a first buoyancy body that is at least partially reversibly compressible.

An apparatus for farming macroalgae that includes a macroalgae farm and variable displacement spar buoy apparatuses connected to the macroalgae farm. Each of the spar buoy apparatus has a top sealed compartment having a gas and a bottom portion that is open at the bottom. A vent pipe extends from the bottom portion up through the top sealed compartment. The variable displacement spar buoy provides buoyancy by adding a gas to the bottom portion through the vent pipe and provides negative buoyancy by removing the gas from the bottom portion through the vent pipe. In this manner, variable buoyancy may be provided to the macroalgae farm to raise or lower the macroalgae farm.

A buoyancy adjuster includes: a buoyant portion detachably attached to a target object including a housing portion having a positive buoyancy, the buoyant portion having a neutral or negative buoyancy; and an orientation adjuster detachably attachable to the buoyant portion, the orientation adjuster configured to adjust orientation of the target object in a fluid. The orientation adjuster includes a weight portion detachably attached to a prescribed position of the buoyant portion, the weight portion having a negative buoyancy exceeding the positive buoyancy of the housing portion. A first height position of the housing portion relative to a second height position of the buoyant portion attaching the weight portion is lower than the first height position relative to the second height position of the buoyant portion without the weight portion in the fluid.

The invention relates to the field of buoy platform control, and discloses a buoy platform buoyancy comprehensive adjusting method and device.The buoy platform achieves negative buoyancy rapid sinking by means of a load balancing weight and achieves positive buoyancy rapid floating by means of weight discarding and piston movement; when the buoy is at a preset depth, the air bag is inflated and expanded to provide auxiliary buoyancy, it is guaranteed that the buoy platform quickly floats upwards, the antenna cabin goes out of water by a certain height, and the shape-maintaining wave-resisting device is opened under the action of expansion of the air bag to provide certain wave-resisting capacity; when the buoy platform needs to dive, the air bag system retracts the inflated air bag, the shape-preserving wave-resisting device retracts under the action of the torsional spring, and the shape-preserving and resistance-reducing effects are achieved; fine buoyancy adjustment is conducted through the piston, and the buoy platform reaches the designated depth. Through organic combination of various buoyancy adjusting means and reasonable mechanical linkage design, the system structure is simplified, and efficient and reliable operation of the buoy platform under the full mission profile is achieved.