8684 results about "Buoyant flow" patented technology

The invention provides a method for constructing a differential diffusion small flame model for buoyancy-driven plume, and the method is applied and expanded to a pool fire combustion process in the field of fire safety. According to the method, the buoyancy driven plume is solved by using the small flame model, the solving number of component equations of the buoyancy plume is greatly reduced through coordinate conversion dimensionality reduction processing, and the main characteristics of the buoyancy plume can be reproduced with relatively high precision and a faster calculation rate. According to the method, high-precision numerical solution of buoyancy plume is realized, and pool fire combustion of gas fuel and liquid fuel and numerical solution of all plume driven by buoyancy can be processed.

The invention belongs to the technical field of ocean monitoring, and discloses a heaving reciprocating observation buoy with a controllable depth range, a control method and a system. The control method comprises the following steps: in a diving stage, the depth range controllable heaving reciprocating observation buoy receives a satellite signal, and a control system executes a diving action; the air bag system controls an air bag to contract through an air path adjusting device, net buoyancy is reduced, and diving is achieved by executing a diving action instruction sent by the control system. In the depth-keeping stage, the air bag volume is not changed; and a floating stage, wherein the marine physical data observed in the floating stage are uniformly sent to a satellite. The multi-stage adjustable mode of the electromagnetic valve is adopted, the opening degrees of the electromagnetic valve are different, and compared with the traditional opening degree of 0-1, the multi-stage adjustable mode is low in energy consumption consumed by opening and closing each time, the energy consumption is reduced, the service life of the buoy is prolonged, and the maintenance frequency is reduced.

Embodiments include a buoyant wave energy converter. In an embodiment, the wave energy converter comprises an upper chamber having a first fluid reservoir and a first gas pocket, and a lower chamber having a second fluid reservoir and a second gas pocket. In an embodiment, an injection tube is between and fluidly coupled to the upper chamber and the lower chamber, where the injection tube is to impel a fluid from the second fluid reservoir into the first fluid reservoir when the upper chamber, the lower chamber and the injection tube oscillate about a waterline with the upper chamber adjacent to the waterline and the lower chamber submerged below the waterline and vertically beneath the upper chamber. An effluent tube is fluidly coupled to the upper chamber and the lower chamber, where the effluent tube is to return the fluid from the first fluid reservoir to the injection tube.

Embodiments disclosed herein include a buoyant wave energy converter. In an embodiment, the wave energy converter comprises an upper chamber having a first fluid reservoir and a first gas pocket, and a lower chamber having a second fluid reservoir and a second gas pocket. In an embodiment, an injection tube is between and fluidly coupled to the upper chamber and the lower chamber, where the injection tube is to impel a fluid from the second fluid reservoir into the first fluid reservoir when the upper chamber, the lower chamber and the injection tube oscillate about a waterline with the upper chamber adjacent to the waterline and the lower chamber submerged below the waterline and vertically beneath the upper chamber. In an embodiment, an effluent tube is fluidly coupled to the upper chamber and the lower chamber, where the effluent tube is to return the fluid from the first fluid reservoir to the second fluid reservoir.

Embodiments include a buoyant wave energy converter. In an embodiment, the wave energy converter comprises an upper chamber having a first fluid reservoir and a first gas pocket, and a lower chamber having a second fluid reservoir and a second gas pocket. In an embodiment, an injection tube is between and fluidly coupled to the upper chamber and the lower chamber, where the injection tube is to impel a fluid from the second fluid reservoir into the first fluid reservoir when the upper chamber, the lower chamber and the injection tube oscillate about a waterline with the upper chamber adjacent to the waterline and the lower chamber submerged below the waterline and vertically beneath the upper chamber. An effluent tube is fluidly coupled to the upper chamber and the lower chamber, where the effluent tube is to return the fluid from the first fluid reservoir to the injection tube.

The invention provides a floating attitude adjustment and optimization system for a floating type offshore wind power equipment group, and relates to the technical field of offshore wind power equipment, and the system comprises a sensing monitoring module which collects an equipment operation attitude parameter set and a marine environment data set in real time; the information is transmitted to the central control unit through the data transmission module, and is analyzed and processed by the equipment attitude prediction module to generate equipment attitude prediction information; the adjustment strategy generation module obtains a target attitude adjustment strategy based on the equipment attitude prediction information and the construction information of the buoyancy attitude adjustment device; the adjustment parameter generation module obtains attitude dynamic adjustment parameters; and the attitude adjustment execution module performs multi-point attitude adjustment and dynamic feedback optimization on the equipment group. The technical problem that an existing floating type wind power equipment set lacks a flexible floating posture adjusting means and is difficult to cope with floating posture changes caused by a complex marine environment is solved, the operation stability of the equipment set is improved, and therefore the power generation efficiency is improved, and the service life of the equipment is prolonged.

The invention discloses a thick plate welding residual stress numerical prediction method based on heat-fluid-solid multi-field coupling, which combines computational fluid dynamics with a finite element method, and comprehensively considers the flow characteristic and thermodynamic effect of liquid metal. In the CFD, the influence of metal melting, molten pool flowing, surface tension, buoyancy, heat transfer and fluid flowing on the geometric shape and temperature distribution of the weld joint is simulated, in the FEM module, the geometric shape and temperature difference of the weld joint are calculated based on the CFD, residual stress and deformation are further simulated and analyzed in combination with a life-death unit technology, and through the FEM module, the residual stress and deformation of the weld joint are obtained. The forming mechanism of the convex welding seam, the evolution rule of the thick plate welding residual stress and the influence of the geometrical shape on residual stress concentration are systematically researched.

The invention discloses a construction method of an ultra-deep buoyancy type double-wall steel hanging box based on a strong tide reciprocating flow sea-crossing bridge bearing platform. The construction method comprises the five process steps of preparation before construction of the steel hanging box, hoisting and lowering of the steel hanging box, preparation before pouring of bottom sealing concrete, pouring of the bottom sealing concrete and construction of the bearing platform. According to the design and construction method for the ultra-deep buoyancy type double-wall steel hanging box based on the strong tide reciprocating flow sea-crossing bridge bearing platform, the buoyancy cabin is arranged for the double-wall steel hanging box of the strong tide rapid flow ultra-large water head to ingeniously solve the problem that the self weight of the steel hanging box is large, four pile casing post-cast strips are reserved to serve as stabilizing measures for resisting reciprocating flow impact in the bearing platform construction period, and the construction efficiency is improved. The construction technology is ingenious, a foundation is laid for smoothly achieving the construction period target of the Hangzhou bay cross-sea railway bridge, and good economical efficiency, practicability and application and popularization value are achieved.

The invention relates to the technical field of unmanned ships, and discloses an unmanned ship with a gravity center self-adaptive adjusting device, which comprises a supporting floating body, a gravity center self-adaptive adjusting device, a gravity center self-adaptive adjusting device and a gravity center self-adaptive adjusting device, the driving mechanism is used for providing necessary power for the catamaran; the cross beam mechanism is used for connecting and supporting the floating body and a main body of the ship. According to the unmanned ship with the gravity center self-adaptive adjusting device, the gravity center shifting mechanism is arranged, when the gravity center self-adaptive adjusting device detects that the operation environment of the unmanned ship is gentle, the bottom platform can descend through the telescopic cylinder, the bottom platform drives the vertical connecting plate and the middle floating body to move downwards, and therefore the area, making contact with water, of the middle floating body is increased; therefore, the wet surface area of the ship can be enlarged, frictional resistance can be fully reduced during high-speed operation, and when the gravity center self-adaptive adjusting device detects that the operation environment of the unmanned ship is severe, the battery can be driven to regulate and control the gravity center, the speed can be properly reduced, and operation safety is kept.

The invention discloses a water quality monitoring device and a monitoring method thereof, and relates to the technical field of water quality monitoring, the water quality monitoring device comprises a supporting plate, a buoyancy mechanism and a driving paddle, the buoyancy mechanism is arranged below the supporting plate, the driving paddle is installed on one side of the buoyancy mechanism, the water quality monitoring device further comprises a multi-parameter lifting water quality detection mechanism and a self-cleaning mechanism, the multi-parameter lifting water quality monitoring mechanism comprises a multi-parameter sensor group and a swing type filtering mechanism for protecting the multi-parameter sensor group, and the swing type filtering mechanism swings back and forth in the lifting process of the multi-parameter lifting water quality monitoring mechanism. Various water quality data can be monitored by means of the multi-parameter sensor group, after monitoring is completed every time, the swing cylinder swings in a reciprocating mode, the spray head is linked to wash the multi-parameter sensor group, meanwhile, the soft brush is linked to ascend and descend, the sensors are wiped, cleaning is achieved, and the influence on the accuracy of next water quality data collection is reduced.

The invention discloses a semi-submersible wave energy-wind energy integrated power generation platform and a damping regulation and control method of a damping regulation and control system of the semi-submersible wave energy-wind energy integrated power generation platform. The platform comprises a semi-submersible wind driven generator platform, a wind driven generator set, a wave energy power generation device, an energy storage system, a sea area detection system and the damping regulation and control system. The wave energy power generation devices are divided into two groups on the inner side and the outer side of the platform, each wave energy power generation device comprises a platform inner side wave energy power generation device and a platform outer side wave energy power generation device, and each wave energy power generation device comprises a swing arm floater, a universal hinge, a connecting arm and a damping adjusting module. The semi-submersible wind power generation device and the wave power generation device are combined, and offshore renewable resources are comprehensively utilized; the six-buoy design is adopted, buoyancy is dispersed, stability and safety are improved, and meanwhile space is provided for a wave power generation device; the floaters are symmetrically arranged in a hexagonal shape and carry a damping regulation and control system, and the whole structure is more easily stabilized by adjusting the damping of the floaters in all directions.

The invention discloses a deep-sea self-expanding horizontal array acoustic subsurface buoy, which relates to the field of deep-sea underwater acoustic detection and comprises an expanding platform arranged at the top of the acoustic subsurface buoy, a subsurface buoy main body positioned below the expanding platform and an anchoring structure connected below the subsurface buoy main body, the subsurface buoy body comprises a buoyancy platform arranged below the unfolding platform and an equipment platform arranged below the buoyancy platform. The problem that a hydrophone linear array composed of a plurality of large-scale acoustic linear arrays is folded and automatically unfolded into a cross horizontal array is solved, and integration of a deep-sea acoustic emission system, an acoustic receiving system, an underwater acoustic communication system and an equipment supply system is achieved. The whole subsurface buoy can be quickly and conveniently released and recycled, and high-reliability anchor mooring is achieved.

A pressure-regulating buoyant hydrodynamic pump is disclosed that floats adjacent to a surface of a body of water over which waves tend to pass. In response to wave-induced movements of the device, water is drawn into a mouth at a lower end of an injection tube, and water is ejected from a mouth at an upper end of the injection tube. The ejected water is deposited into an interior of the hollow buoy thereby augmenting a water reservoir therein. And water flows from the water reservoir to and through a water turbine, thereby energizing a generator, power electronics, and an electrical load. A novel water-turbine effluent buffering tube, or chamber, smooths pressure variations felt across the water turbine.

The invention relates to the technical field of unmanned detection, and provides an axle buoyancy chamber type indoor inspection airship. A cabin body of the inspection airship is of a shell structure and is divided into an upper cavity and a lower cavity, a hollow stepping motor is installed in the upper cavity, and a detection control unit is installed in the lower cavity. Two buoyancy tires are symmetrically arranged on the two sides of the cabin body and installed on the cabin body through tire supports, the buoyancy of the buoyancy tires is larger than the dead weight of the airship so that the buoyancy tires can make close contact with the top face of the limited space, and a wheel train driving friction pair is formed. A hollow transmission shaft of the buoyancy tire is connected with the output end of the hollow stepping motor, and the buoyancy tire walks on the top face of the limited space in a wheel mode. The buoyancy tires can perform automatic air supply and / or buoyancy adjustment so as to adjust the buoyancy of the airship; two independently-driven vector fans are correspondingly arranged on the outer sides of the two buoyancy tires respectively, and the angle and thrust differential motion of the vector fans are changed through rotation of the two vector fans, so that position and attitude control of the airship in the flying process is achieved.

The invention relates to the field of offshore floating type wind power, in particular to an automatic buoyancy adjusting system and method for a floating type draught fan platform, the adjusting system comprises a buoyancy device which is fixedly installed on a stand column or a buoyancy box, the buoyancy device comprises a semi-flexible shell, and at least one air bag is arranged in the semi-flexible shell; the volume of the air bag is determined through the following steps that S1, real-time motion data and environment data of the floating type draught fan platform are obtained; and S2, whether the current posture of the floating type fan platform is stable or not is evaluated by analyzing the real-time motion data and the environment data, and if not, the size of an air bag is adjusted by inflating and deflating. By arranging the buoyancy device, buoyancy can be flexibly adjusted according to sea conditions, heaving, trim and rolling motions of the floating fan platform under the action of waves, wind loads and ocean currents are remarkably reduced, the platform can adapt to rapid changes of the sea conditions in a short time, and impact of stormy waves on the platform is reduced.

The invention relates to the cross technical field of fluid mechanics and machine learning, and discloses a particle fluid two-phase flow simulation and reverse optimization method based on deep learning. The method comprises the following steps: constructing a two-phase flow coupling simulation framework based on a fusion discrete element method and smoothed particle fluid dynamics; the drag force, buoyancy and capillary force between particles and fluid are introduced, and the calculation efficiency is improved through GPU parallel acceleration; a graph neural network is adopted to establish a particle-level dynamic interaction modeling framework, and coding and prediction of solid particles and fluid particles are independently processed; a differentiable reverse design system is further developed, and layout parameters of a flow control structure are dynamically optimized based on a gradient descent method by combining automatic differential characteristics of GNN and surrounding target functions such as flow collapse degree and centroid offset, so that effective suppression of two-phase flow destructive behaviors and system performance optimization are realized. The method has high-precision simulation and efficient optimization capabilities, and is suitable for complex two-phase flow engineering scenes such as dam burst and debris flow prevention and control.

The invention provides a lifting floating bottom system for an experimental pool, and the system comprises the experimental pool which comprises an experimental cavity, and the bottom of the experimental cavity is provided with a plurality of buffer seats; the guide rail is arranged on the inner side wall of the experiment cavity; the floating bottom body is movably arranged in the experiment cavity and comprises a plurality of floating boxes with hollow cavities; the guide jacking mechanism is arranged on the outer side wall of the floating bottom body and comprises a linear displacement driving source and a guide wheel connected with the linear displacement driving source, and the guide wheel is arranged in the guide rail in a sliding mode; and the winch is connected with the bottom of the floating bottom body through a flexible traction piece. The invention further provides an experiment method of the lifting floating bottom system. Compared with the prior art, the floating bottom has the advantages that the floating bottom body can rise by means of the buoyancy of the floating bottom body and descend under the dragging action of the flexible traction piece, the depth of the floating bottom body can be adjusted conveniently and rapidly, and the water depth needed by various experiments is met.

The invention belongs to but is not limited to the technical field of seabed monitoring, and particularly relates to a strain test method and system for subsurface buoy shell strength, and the method comprises the steps: S1, selecting points on the surface of a shell, and pasting strain gauges; s2, putting into a sealed kettle, and injecting water and pressurizing; s3, testing the strain condition of the shell by using a strain tester; and S4, the pressure tolerance degree of the shell is analyzed through calculation. The buoyancy provided by the floating body shell and the overall weight of the subsurface buoy are calculated in detail, and the needed ballast balance weight is accurately measured and calculated. Buoyancy and gravity balance is verified through dynamic simulation, it is ensured that the subsurface buoy can stably suspend or settle in water, and the design feasibility and the actual application effect are improved.

A wave energy power generation device includes a plurality of up-down moving mechanisms configured to move up and down along a spiral rod under the action of waves, a mass block arranged at a lower part of the power generation device; a buoyancy barrel arranged in the middle of the power generation device, a guide rail arranged on one side of the up-down moving mechanism, and a spiral rod. Through the interaction of the up-down moving mechanism and the spiral rod, the up-down movement of waves can be converted into rotational kinetic energy, a scroll spring is used for storing energy, then the rotating speed is stabilized through an escapement mechanism, a power generation assembly accelerates energy output, and finally a generator is driven to generate power.

The invention discloses a maneuvering fish searching platform system and a maneuvering fishing method.The maneuvering fish searching platform system is characterized in that one or more of a marching power assembly, a fish luring device and a fish searching device are detachably integrated on a buoyancy body assembly, the buoyancy body assembly can correspondingly march on water, and meanwhile when the fish searching device detects that a fish school appears within a preset distance, the buoyancy body assembly is driven to move back and forth; the fish luring device starts a fish luring working condition, so that a fish school is close to the fish luring device and correspondingly gathers, and the functions of flexibly and visually searching and luring the fish are realized, so that the device has the characteristics of flexibly and efficiently searching and luring the fish by adding the maneuvering function, conditions are provided for follow-up net fishing or rod fishing, and the fish luring efficiency is improved. And through the method, multiple persons can participate in fish searching and fish luring activities, so that the characteristic of enjoying fishing fun is achieved, the interestingness of the activity process is increased, and the method has a better application prospect and a higher popularization value.

In an embodiment, a water egress system is disclosed that provides individuals or pets with ease of access to elevated areas from the water. The water egress system includes a buoyant base including a ramp. The water egress system further includes a bolster disposed proximate to a surface of the base and an attachment mechanism that is configured to secure the bolster to the base.

The invention provides a marine methanol fuel storage tank, and belongs to the technical field of marine storage tanks. Comprising a storage tank, the bottom of the storage tank communicates with a conical barrel, one side of the top of the storage tank communicates with a feeding pipe, one side of the storage tank is fixedly connected with a protection box, the bottom of the protection box is fixedly connected with a retention barrel, and a stabilizing assembly used for stabilizing output of methanol is arranged in the storage tank. Through arrangement of the stabilizing assembly, when the liquid level of methanol descends, the gravity floating plate can automatically slide down along with descending of the liquid level, the multiple layers of buoyancy plates below the gravity floating plate are gradually activated and slide down layer by layer, downward compression pressure is applied to the liquid level, and initial pressure generated by the gravity floating plate is matched with layer-by-layer sliding down of the buoyancy plates; the stability of the liquid level in the descending process can be kept, so that the flow uniformity during methanol output is ensured, the gravity floating plate can generate a multi-section extrusion effect in the downward moving process through the design, and the phenomenon of unstable output caused by methanol fluctuation is effectively avoided.

The invention discloses an underwater operation robot. The underwater operation robot comprises a multi-direction posture self-stabilization structural frame and a rotary cleaning system; the structural frame comprises a buoyancy pipe, and a flowing medium is arranged in the buoyancy pipe; the rotary cleaning system comprises a plurality of rotary cleaning discs and a water inlet, and the water inlet communicates with external water supply equipment to supply water to the rotary cleaning discs; the rotary cleaning disc comprises a cavitation nozzle obliquely arranged relative to the rotary cleaning disc, and when the cavitation nozzle sprays liquid, the counter-acting force of the cavitation nozzle drives the rotary cleaning disc to rotate. According to the underwater operation robot, the structural frame with the multi-direction posture self-stabilizing function is adopted, the flowing medium is injected, autonomous keeping of the underwater posture of the robot is achieved, and the control difficulty is reduced. In addition, the rotary cleaning system adopts the cavitation jet technology, the cleaning effect is good, the rotary cleaning disc can spin when the cavitation nozzle sprays water, no extra energy or no driving mechanism is needed to drive the rotary cleaning disc to rotate, the structure is simple, and the reliability is high.

The invention provides a method, device and equipment for determining a buoyancy generation item of atmospheric turbulence kinetic energy and a storage medium, and the method comprises the steps: obtaining the wind speed at a plurality of moments through a wind measurement radar within a specified time length, and obtaining the buoyancy generation item of the atmospheric turbulence kinetic energy according to the wind speed at the plurality of moments; the dissipation rate and pulsation components corresponding to the wind speed in different coordinate axis directions are determined, a turbulence trend item, a shear generation item and a turbulence transmission item are determined according to the pulsation components corresponding to the different coordinate axis directions, and the wind speed is acquired by adopting a wind measurement radar, so that the spatial resolution and the data continuity of data are improved, and the detection range is expanded. And more accurate dissipation rate, turbulence trend term, shear generation term and turbulence transmission term are determined, so that the buoyancy generation term of the atmospheric turbulence kinetic energy can be more accurately deduced according to the dissipation rate, turbulence trend term, shear generation term and turbulence transmission term, and the accuracy of the buoyancy generation term is ensured.

Disclosed herein is a buoyant structure for offshore deployment. The buoyant structure comprises a first deck having a first channel through the first deck; a second deck having a second channel through the second deck, wherein the first deck and second deck are coupled to each other and arranged spaced apart from each other; and a plurality of floatable substructures coupled to and around at least one of the first deck and the second deck, the plurality of floatable substructures arranged spaced apart from one another, wherein the first channel and the second channel are aligned to receive at least a portion of a tower of a wind turbine.

The sea and air amphibious robot comprises a support, a machine arm assembly, an air propelling assembly, an underwater propelling assembly, a shell and a waterproof cabin, the shell is fixedly connected to the support, the waterproof cabin is installed in the shell, the machine arm assembly comprises a plurality of machine arms, and the machine arms are symmetrically connected to the two sides of the support correspondingly; the air propelling assembly comprises a plurality of air propellers, the underwater propelling assembly comprises a plurality of underwater propellers, the air propellers and the underwater propellers are installed on the multiple machine arms correspondingly, the installation positions of the underwater propellers are lower than the installation positions of the air propellers, and the buoyancy of the sea and air amphibious robot in water is larger than the gravity. When the sea-air amphibious robot statically floats on the water surface, at least part of each air propeller is located above the water surface, and each underwater propeller is located below the water surface. According to the sea and air amphibious robot, efficient propelling of the robot in water and air media can be achieved.

The invention provides a diving kail ship. The diving kail ship comprises a ship body, a passenger compartment, a variable buoyancy system, an oxygen supply system, an underwater propelling system and a central control system. The ship body is of a main body structure capable of submerging the kail ship. The passenger compartment is arranged in the center of the interior of the ship body and used for containing passengers and is kept in a sealed state during diving. The variable buoyancy system comprises a plurality of buoyancy compartments, is arranged in the ship body, is close to the passenger compartment, and is used for controlling the buoyancy of the kalting ship to realize diving and floating; the oxygen supply system is arranged in the ship body, is adjacent to the passenger compartment and is used for providing oxygen for the passenger compartment; the underwater propelling system is arranged outside the ship body and used for providing underwater power and achieving underwater movement of the kalting ship; the central control system is arranged in the ship body and used for controlling work of the variable buoyancy system, the oxygen supply system and the underwater propelling system. The entertainment requirements of tourists on the water surface and underwater can be met.

The invention discloses a marine ranch breeding device, and belongs to the technical field of marine ranches, the marine ranch breeding device comprises a supporting plate, a fixing rod is fixedly mounted on the bottom wall of the supporting plate, and a feeding assembly is arranged on the supporting plate; the feeding assembly comprises a vertical rod fixedly installed on the top wall of the supporting plate, and a buoyancy plate is installed on the vertical rod in a sliding mode. According to the feeding device, by arranging a feeding rod, in the telescopic pipe contraction process, airflow in a telescopic pipe flows into an annular groove through a first air pipe and flows into a feeding groove through the annular groove, so that the pressure in the feeding groove can be increased, the feeding rod moves towards the outside of the feeding groove under the action of the pressure, an elastic cushion is stretched, and the feeding rod is moved out of the feeding groove; and then, in the moving process of the feeding rod, the feed in the feed storage tank is driven to move out of the feeding tank and fall into the marine ranch, that is, the feed can be automatically fed into the marine ranch without power equipment, and the effect of improving the feeding effect is achieved.

The invention relates to an amphibious vehicle body stability control method, system, equipment and medium, and belongs to the technical field of vehicle control, the amphibious vehicle body stability control method comprises the following steps: after a vehicle enters water, heeling angle data is acquired in real time; and when the heeling angle data exceeds a set threshold value and the maintaining time exceeds a preset duration, the volumes of air bags arranged on the two sides of the vehicle are adjusted in real time so that buoyancy distribution can be adjusted, and the purpose of stably controlling the vehicle body is achieved. According to the overwater vehicle body stability control method and system based on multi-sensor fusion and dynamic adjustment disclosed by the invention, the problems of turning, heeling and wave interference when the vehicle sails on the water surface are solved. The stability of amphibious vehicle sailing on water is greatly optimized, and the amphibious vehicle is suitable for development of intelligent amphibious vehicles in the future.

The invention relates to the technical field of lifesaving equipment, in particular to a lifesaving composite belt for emergency survival, which comprises a first air bag belt, two groups of compressed air tanks are symmetrically mounted on the outer side of the first air bag belt, and first tying ropes are fixedly connected to joints at two ends of the first air bag belt; the backpack assembly comprises a neck buoyancy component and a fixing component, the neck buoyancy component is arranged at the top end of the first air bag belt, and the fixing component is arranged on the neck buoyancy component; a back support assembly; and a leg buoyancy assembly. Through mutual cooperation of the first air bag belt, the compressed air tank, the back supporting assembly and the leg buoyancy assembly, a user floating in water can quickly and conveniently change different floating states according to own requirements, the operation is simple, the survival rate of the user is improved, the two floating modes do not influence each other, and the user experience is improved. The use effect of the two floating modes is better, so that the survival rate of the user is further improved.