13 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 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.

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.

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.

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.