362 results about "Jet propulsion" patented technology

A watercraft includes an improved engine control system that enhances the responsiveness of the watercraft and eases watercraft operation. The watercraft includes a propulsion device, such as a jet propulsion unit, and an engine that powers the propulsion device. The engine control system is configured to maintain or increase engine speed under certain operating conditions.

A novel pressure-exchange ejector is disclosed whereby a high energy primary fluid transports and pressurizes a lower energy secondary fluid through direct fluid-fluid momentum exchange. The pressure-exchange ejector utilizes non-steady flow principles and both supersonic flow and subsonic flow embodiments are disclosed. The invention provides an ejector-compressor / pump which can attain substantially higher adiabatic efficiencies than conventional ejectors while retaining much of the simplicity of construction and the low manufacturing cost of a conventional ejector. Embodiments are shown which are appropriate for gas compression applications such as are found in ejector refrigeration, fuel cell pressurization, water desalinization, and power generation topping cycles, and for liquid pumping applications such as marine jet propulsion and slurry pumping.

A steering control system is provided that provides thrust for steering control in a watercraft that is powered by a propulsion unit. The steering control system is applicable to various types of watercraft, including boats and personal watercraft, that are powered by inboard jet propulsion systems or outboard engines. The steering control system is activated by the steering helm assembly and / or an electronic control mechanism. Thrust is provided by preferably controlling the throttle, or more particularly the air-fuel mixture of the carburetor of the engine. The system is particularly, although not solely, suited for steering while the watercraft is operated at low speeds.

A watercraft includes an improved engine control system that eases watercraft operation. The watercraft includes a propulsion device, such as a jet propulsion unit, and an engine that powers the propulsion unit. The engine control system is configured to limit engine speed under certain conditions.

A variable marine jet propulsion system incorporates a motor, a variable-pitch propeller pump in a spherical housing, a variable housing and a variable inlet duct, and a microcontroller. The pump, the nozzle and the inlet are controlled by the microcontroller, which is programmed to control the pump as a continuously variable power transmission for maintaining efficient motor operation, the nozzle for maintaining efficient pump operation, and the inlet for maintaining efficient recovery of the total dynamic head of the incoming water. The spherical pump housing maintains close fits to the propeller vane tips for more efficient operation at all pitches, including zero and reverse pitches. Zero pitch results in no effective pumping action, effectively a true neutral in fluid power transmission. Reverse pitch in combination with the large variable nozzle provides reverse flow and consequently reverse thrust, which eliminates the need for the “backing bucket”.

An apparatus for centrifugal casting under vacuum includes a rotor having a shaft extending in an essentially vertical direction and being rotatable around an axis defined by the shaft. The rotor has at least one mold, at least one crucible, and a gas-tight housing in which the mold and the crucible are accommodated. The apparatus also includes a vacuum source to create a vacuum in the housing, a heating device that melts a metal, a drive device that drives the shaft in order to rotate the rotor, and an auxiliary acceleration device configured to generate a force to further rotate the rotor to overcome a moment of inertia of the rotor. The auxiliary acceleration device includes a jet propulsion and / or at least one pushing actuator accelerating the resting rotor.

The invention relates to the field of jet propulsion application, in particular to a jet propulsion pipeline decontamination machine, which includes a fuselage and a fixing frame provided on the left side of the fuselage. In the gear lever fixedly connected to the fuselage, four guide grooves opening outward are symmetrically distributed in the center of the end wall of the fixed frame, and left and right symmetrical moving blocks are slidably arranged in the guide groove. The moving block is provided with left and right threaded holes with reverse threads passing through the left and right, and the threaded holes are internally connected with threaded rods. The jet propelled pipeline decontamination machine provided by the present invention can realize the sludge in the pipeline. For cleaning, the equipment uses jet propelling equipment to drive the scraper to the depth of the pipeline. When it moves to the maximum limit, it drives the scraper to abut against the pipe wall, and then pulls the scraper to the outside of the pipe through the wire drawing device, thereby contaminating the inner wall of the pipe Mud scraping, the device of the invention is completely scraped, and the scraping force is large, which is more efficient.

A watercraft has a pivoting, shock absorbing component that absorbs forces applied to its hull. The watercraft includes a hull, a deck coupled to the hull, an engine, and a jet propulsion system movably coupled to the engine. In one embodiment, a forward hull portion couples to the deck and a rearward hull portion movably couples to the deck and / or the forward hull portion. The jet propulsion system mounts to the rearward hull portion, while the engine mounts to the deck. A suspension element is disposed between the hull rear portion and either the deck or the hull forward portion. In another embodiment, the hull and deck are movably coupled to each other.

The invention relates to a satellite multiple attitude control mode test system based on a double gimbal control moment gyroscope (DGCMG) structure. Performance of three satellite attitude control systems which are based on a DGCMG, a single gimbal control moment gyroscope (CMG) and a flywheel is tested and verified through a DGCMG actuating mechanism. The satellite multiple attitude control mode test system based on the DGCMG structure comprises a platform system, the satellite attitude control system, a space environment simulation system and a ground station system. The platform system is composed of a tri-axial air bearing table, a satellite service comprehensive management system, a power source and a wireless bridge and used for simulating satellite dynamic characteristics and information management. The satellite attitude control system is composed of a jet propulsion system, the DGCMG, a fiber-optic gyroscope, a star sensor, a sun sensor and a global position system (GPS) receiver and used for determination of an attitude and an orbit and control of a satellite platform. The space environment simulation system is composed of a GPS simulator, a sliding block which is of a pyramidal structure, a sun simulator and a star simulator and used for simulating space interference torque, and part performance of a GPS satellite and a celestial body. The satellite multiple attitude control mode test system based on the DGCMG structure can provide ground testing and verification for multiple attitudes of a satellite.

To provide an engine control unit for facilitating steering control. In particular, the invention relates to a controller of a boat propelled by jetting water pressurized and accelerated by a water jet pump. If a throttle angle of an engine for driving the water jet pump is a predetermined value or less and a steering angle by a steering handlebar of the jet propulsion boat is a predetermined value or more, a throttle valve of the engine is operated in an opened direction and advance angle control is made over the normal ignition timing of the engine.

A commonly actuated trim and reverse system for a jet propulsion watercraft is provided. The system includes a movable actuator connected to a movement transfer mechanism. The movement transfer mechanism is operable to adjust both the trim angle of the steering nozzle of the watercraft and the orientation of the reverse gate, as a function of the movement of the actuator. Control electronics evaluate the target steering for the trim angle and gate orientation and control the movement of the actuator accordingly.

The stern hull portion of a sea craft through which main exit flow channels extend to projecting jet propulsion nozzles, is provided with facilities for controlled maneuvering of the sea craft, including steering, stopping, negative thrust backing and docking without substantial hydrodynamic loading and with facilitated installation. Such maneuvering control facilities include a secondary flow channel extending from each of the main exit flow channels having two angularly related subchannel branches for pressurized water outflow through gated openings in the hull from which propulsion jets emerge under maneuvering control. Either control of a subchannel diverting flapper, or by use of selective closure gates and a flow diverting flap within the main exit flow channel, maneuvering may be effected in response to inflow through inlet openings in the hull of water that is pressurized before supply to the main exit flow channels.

An automatic trim system for a jet propulsion watercraft is provided. Control electronics are in communication with a steering angle sensor to monitor the steering angle of the watercraft, and evaluate a target setting for the trim taking the steering angle into consideration. Control signals are sent to an appropriate actuating device for adjusting the trim angle accordingly.

The invention discloses a welding process used for a marine water-jet propulsion chute grate. The process comprises the following steps: firstly, grate components are processed well and the margins are pre-preserved; the actual mounting is carried out to define the actual mounting positions and the final sizes of the components; the components are pre-fixed through spot welding; and after checked and passed, the components are welded in the ship chute to form a complete grate. The proper sequence and process parameters are adopted in the welding so as to reduce the internal stress as much as possible; after welding, the whole grate is demounted to repair welding seams and carry out aging treatment and then the grate is remounted so as to further enhance the strength of the grate and reduce internal stress. The invention can better satisfy the technical requirement and precision requirement of manufacturing, mounting and welding the chute grate so as to avoid the cracks or breaking of grate strips caused by the wearing of the grate structure due to ship vibration.

An aircraft has at least two jet-propulsion engines mounted laterally on the fuselage in a symmetrical design in the aft part of the fuselage. Each jet engine is mounted on the fuselage some distance from the vertical plane of symmetry of the aircraft, so that the jet engine, in a so-called half-buried configuration, is partly inside an envelope surface of a theoretical fuselage. The half-buried, jet engines are mounted on a main boom fitted on the vertical plane of symmetry of the aircraft, inside the fuselage in back, of a forward main frame. The tail sections are mounted on the main boom and the boom is integral with structures for transmitting forces into the forward part of the fuselage. The structure is advantageously made of fiber-reinforced composite materials.

The fuel additives of the present invention comprise essentially of about 10-50 weight % of terpene, 0-15 weight % of Alkylene Glycol Ether, and 40-80 weight % of 2-Propanone, 0-20 weight % of Dibasic Methyl Ester and 0-15 weight % of nonyl phenol ethoxylate and 0-15 weight % of mineral oil. This highly effective fuel additives can eliminate the formation of deposits and form air-borne micro-cluster molecules in internal combustion engines, particularly, in the fuel injection system and combustion chamber of such engines.

The invention discloses a pulse jet type underwater robot based on a tubular origami structure, which is composed of a pulse jet mechanism and two steering propulsion mechanisms, wherein the pulse jetmechanism realizes the repetitive process of water storage-water spray-water storage-water spray by impulse jet propulsion. The structure of the two steering propulsion mechanisms is the same, the first steering propulsion mechanism realizes turning to the right and the second steering propulsion mechanism realizes turning to the left; the pulse jet mechanism realizes the functions of water storage and water spraying through the axial expansion and contraction of the tubular origami structure; the tubular origami structure is driven by the rack and pinion mechanism to realize the axial expansion and contraction of the tubular origami structure, the steering propulsion mechanism is driven by the streamlined semi-circular fish fin structure to perform the reciprocating swing to achieve thesteering propulsion function, and the fish fin structure is driven by the swing guide rod mechanism to achieve the reciprocating swing. The invention is a novel underwater robot and has the advantagesof simple structure, fast propulsion speed, flexible steering and the like.

The invention provides a rotating member disturbance compensation method based on a momentum wheel. The rotating member disturbance compensation method includes (1) performing disturbance analysis to the rotating member; (2) determining disturbance compensation functions of the rotating member; (3) designing a realizing method of invoked disturbance compensation on the basis of time slice interruption; (4) performing fusion of a compensation torque and an attitude control torque; and (5) determining a manner of outputting control voltage to an I / O (input / output) port of the momentum wheel so as to realize the disturbance compensation to the rotating member. By the rotating member disturbance compensation method, attitude control accuracy is improved while fuel consumption of jet propulsion system compensation is reduced; since attitude control periods and control computer time slice interrupt laws are combined in the rotating member disturbance compensation method, hardware sources are fully utilized; and the problem of inconsistence of control periods and compensation periods is solved through a manner of combination of hardware and software, and compensation control in orbit in real time is realized.

A rocket engine has a combustion chamber and an expansion chamber interconnected by a nozzle. Both chambers and the nozzle are made of carbon fiber reinforced silicon carbide formed as a monolithic rocket engine body or formed in sections bonded to each other to also form such a monolithic rocket engine body. The rocket engine body is mounted in a support structure, preferably made of a metal. The rocket engine body sections are produced by mechanical machining of respective blanks made of C / SiC materials. Cooling channels and / or heat insulation structures are used for heat control. The insulation structures are preferably also made of C / SiC materials or of carbon fiber felts or of graphite film.

A moving, floating waterfowl decoy propelled by a steam jet motor and used by hunters to attract waterfowl to the hunting area. The device is an addition to a standard commercial hollow floating waterfowl decoy of any species. The steam jet motor is powered by combustion of fuel and has no moving parts. The steam jet propulsion system provides lifelike natural movement, wakes, ripples and splashes to enhance attraction of a decoy set.

A personal watercraft includes a hull and a jet propulsion unit that propels the hull. An engine powers the jet propulsion unit. The engine includes an air intake system to introduce air to a combustion chamber. The intake system includes a throttle valve to regulate an amount of the air. The throttle valve is moveable generally between a closed position and an open position. A fuel injection system is arranged to spray fuel for combustion in the combustion chamber. The engine also includes an intake pressure sensor, a throttle valve position sensor and an engine speed sensor. A control device is provided to control an amount of the fuel using either a D-j control mode or an alpha-N control mode. The D-j control mode is based upon a signal from the intake pressure sensor and a signal from the engine speed sensor. The alpha-N control mode is based upon a signal from a throttle valve position sensor and the signal from the engine speed sensor. The control device uses the D-j control mode either when the throttle valve is relatively in a low opening degree range or when an engine speed is relatively in a low speed range, and uses the alpha-N control mode either when the throttle valve is relatively in a high opening degree range or when the engine speed is relatively in a high speed range. Additionally, the control device is configured to detect the malfunction of the throttle valve position sensor and the pressure sensor. If the throttle valve position sensor malfunctions, the control device uses only the D-j control mode. If the pressure sensor malfunctions, the control device uses only the alpha-N control mode.

A watercraft has a jet pump and a venturi. A variable trim system (VTS) support and a reverse gate are rotationally mounted relative to the venturi. A steering nozzle is rotationally mounted to the VTS support. A rotary actuator has an output portion operatively connected to at least one of the VTS support and the reverse gate. Rotation of the output portion between a first angle and a second angle causes a rotation of the VTS support while the reverse gate remains in a stowed position relative to the steering nozzle. Rotation of the output portion between the second angle and a third angle causes a rotation of the reverse gate between the stowed position and a second position while the VTS support remains in a fixed position. A jet propulsion system and a method of operating a jet propulsion system are also disclosed.

The present invention discloses a method of electromagnetic drive rectilinear motion and the device thereof, comprising a electric driver, two electromagnets in the shape of U (two feet are in parallel and form an angle at one end), a straight metal conductor provided with a location sensor which form a shape of letter 'n' with the electromagnets. Inputting two continuous periodic sawtooth wave pulse current to the device, generating periodically enhanced or weakened magnetic field on two magnetic poles of the electromagnets, generating periodic magnetic flux enhancement or weakening on touch part between conductor and magnetic poles, generating eddy current on partial conductor and the energy conversion used for conductor displacement, hence electromagnetic linear drive and power - magnetic energy - mechanical energy conversion are realized. As prime mover of rectilinear motion and or straight reciprocating motion, the device in the invention can replace existing bent axle or complex mechanism like eccentric wheel, engine oil cylinder etc., and can be applied on engine of motorcycle and electric vehicle, new electric submersible direct-drive reciprocating pump (oil well), compressor of refrigerator and air condition, high pressure pump, intercity maglev light rail, maglev train and ship injection propulsion pump etc. as a new engine device.

A watercraft includes an improved engine control system that enhances the responsiveness of the watercraft and eases watercraft operation. The watercraft includes a propulsion device, such as a jet propulsion unit, and an engine that powers the propulsion device. The engine control system is configured to maintain or increase engine speed under certain operating conditions.

A marine vessel propulsion device includes an engine, a jet propulsion unit, and a reverse gate. The jet propulsion unit includes a jet port arranged to jet water toward a rear of a hull. The reverse gate is arranged to be capable of being changed in opening degree between a fully closed position of covering an entirety of the jet port and a fully opened position of not covering the jet port at all. The reverse gate is arranged to be moved, between the fully closed position and the fully opened position, to a first partially closed position of only partially covering the jet port and a second partially closed position of only partially covering the jet port and being closer to the fully opened position than the first partially closed position.

The invention provides a ground-effect vehicle capable of shallowly diving, which can dive shallowly to hide water-jet propulsion and rise over the sea surface to increase jet propulsion, changes hydrofoils into airfoils, generates ground effect, flies over sea or very closely to the ground, and lands in a jet traveling manner. A multistage double circular-arc gear high pressure large capacity pump or multistage internal serial connection dual-charging double circular-arc gear pump is taken as the hydraulic propeller pump during the shallow diving process and the jet propeller pump during the process of flying over the sea. A water pump is used for water inlet submergence and water drainage to a ballast water tank besides water jet; when jet flow is performed at the tail part, and one side is shut off, namely, steering is realized; when flying over the sea, the ground-effect vehicle is still closely stuck to the sea surface for water-jet propulsion. The jet propeller pump can be used for jet propulsion at the tail part and jet hovering at the bottom part through a valve, and the jet at the tail part is turned, so that the purpose of changing the heading can be achieved. The ground-effect vehicle has four navigation conditions: main water-jet shallow diving; main water-jet and jet flying over the sea; minor jet flying near the ground; and minor jet traveling wheel landing, and the ground-effect vehicle is manufactured by manly adopting a novel light material, for example, the fiber reinforced composite material (FRP).

The invention discloses a water surface floating pollutant clearing device and method. The water surface floating pollutant clearing device comprises two floating brush heads, a floating plate and a collecting bin. The two floating brush heads are arranged at the bottom of the front side of the floating plate in a bilaterally symmetrical mode. A bracket, a processor and an air pump are sequentially arranged on the floating plate from left to right. A sweeping motor is located between the bracket and the processor, the collecting bin is located between the processor and the air pump, and the upper portion and the lower portion of the collecting bin are located on the upper side and the lower side of the floating plate correspondingly. Two floats are arranged at the bottoms of the left sideand the right side of the floating plate correspondingly. The water surface floating pollutant clearing method comprises the steps of device entering into water, automatic detecting, gas-jet propulsion, intelligent obstacle avoiding, opposite-sweeping picking, filtering treatment, compression treatment, solar charging and garbage unloading. The water surface floating pollutant clearing device andmethod have the advantages that the clearing efficiency is high, the sustainable working time is long, automation and intellectualization are achieved, and controllability is high.