325 results about "Pump-jet" patented technology

The invention discloses a water-borne three-body trash cleaning ship and a cleaning method. The three-body trash cleaning ship uses a three-body ship as a carrier, and consists of a recovery cabin, a collecting cage, a sling device, a side supporting net, a water pump, a water spraying thruster, a nozzle and the like. The water pump sucks a large quantity of water from a water inlet, most of the water is delivered to the water spraying thruster so as to be used for pushing a ship body to advance, a small quantity of water is delivered to the nozzle above the side supporting net and used for driving trash and aquatic plants in front of the trash cleaning ship to a place in front of the collecting cage, simultaneously, water flow, which rearwards moves relative to the ship body, in front of the ship body automatically drives the trash into the collecting cage, and after a certain quantity of trash is stored in the collecting cage, the sling device hangs and conveys the collecting cage to a position above the recovery cabin so that the trash is poured into the recovery cabin. One-step trash cleaning area is large, secondary pollution is avoided, equipment is simple in installation and maintenance, and the water-borne three-body trash cleaning ship is particularly suitable for cleaning large-range trash and aquatic plants in lakes and short sea.

The invention discloses a measuring device and a measuring method of an internal flow field and external characteristics of a water-jet propeller, and relates to the field of ship propulsion. A power unit of the measuring device of the internal flow field and the external characteristics of the water-jet propeller is suspended inside a ship model; two thrust acquisition modules of a data acquisition unit are arranged at the middle front part and the tail part of the ship model respectively; an axial force acquisition module is arranged on the power unit; a rotating speed and a torque acquisition module is arranged on the power unit. According to the invention, as a propeller shell made of a transparent organic glass material is adopted, observation and measurement for the internal flow field of the water-jet propeller are realized; as the data acquisition unit obtains the thrust, the axial force, the rotating speed and the torque of the propeller, and calculates the power of the propeller based on the rotating speed and the torque, the external characteristic of the propeller is accordingly obtained; the measuring device for the internal flow field and the external characteristic of the water-jet propeller is simple in structure, high in measurement precision and strong in operability.

The invention discloses a design method of a hydraulic model of a shaftless drive type integrated motor pump jet. By means of the method, the propeller which is equal to a seven-blade highly skewed propeller in open water efficiency and lower in radiation noise can be designed, wherein a motor and the pump jet are completely integrated. The method comprises the steps of a pump fluid channel hydraulic parameter type selection design, a parametric three-dimension reversal design of pre-positioned stator and post-positioned impeller blades, non-air-gap pump jet open water performance checking, and propelling, cavitation and noise performance and strength checking of the integrated motor pump jet. The pump jet which is composed of a thick guide pipe of an embedded motor stator, a motor annular rotor, an air gap, a pre-positioned stator and a post-positioned impeller is designed. The propelling efficiency is 0.589, the power is 3.7 MW and the pump jet can propel submersible vehicles with the navigational speed being 16 knots. The number of the stator blades is 13, the number of the impeller blades is 9, an NACA 16 wing type thickness distribution method is adopted for the stator blades and the impeller blades, and the impeller is highly skewed. The design method can be directly used for realizing shaftless electric propelling of unverwater vehicles, and is also suitable for shaft type pump jets and torpedo post-positioned stator type integrated motor pump jets.

The invention belongs to the field of marine observation associated equipment and discloses a hybrid drive type underwater glider with various working modes. The hybrid drive type underwater glider comprises a shell, horizontal wings, a combination planar antenna, a vertical tail vane, an observation instrument, a fixed battery pack, a mass center adjusting device, a buoyancy adjusting device, anemergency load rejection device and a pump jetting propelling device, wherein the horizontal wings, the combination planar antenna and the vertical tail vane are installed on the outer portion of theshell, the observation instrument, the fixed battery pack, the mass center adjusting device, the buoyancy adjusting device, the emergency load rejection device and the pump jetting propelling device are installed in the shell, and meanwhile, according to the modularized design concept, the shell is designed to be provided with a stem loading cabin, an energy cabin, an attitude adjusting cabin, a buoyancy adjusting cabin and a stern maneuvering cabin. The hybrid drive type underwater glider has the beneficial effects of being low in power consumption, long in cruising range, long in endurance and the like, the flow resisting capacity is remarkably improved, various motion modes are provided, high-accuracy emergency load rejection can be executed, and therefore a target sea area can be observed in a large range and with high accuracy.

The invention relates to an unmanned ship movement control system and method. In the control system, a control module comprises a central controller, a heading controller, a rudder angle controller, a backing controller, a speed controller and an accelerator controller, an information collection module comprises a rudder angle sensor, a speed sensor, a heading sensor, a minigyro, a radar detector and a rudder angel compensator, a power module comprises an engine, a rudder pump device, a water-jet propulsor and a backing pump, and the control system can achieve the functions of trajectory tracking, turning rollover prevention, obstacle avoidance and backing and solves the rudder angle zero drift problem. In the control method, the heading controller is driven to continuously adjust the rudder angle of the rudder pump device through heading angle errors, and operation control of the whole navigation process is achieved; meanwhile, a speed control ring is introduced to assist in long distance target tracking, a rudder angle compensation ring is introduced to overcome rudder angle zero drift in ocean currents, and the minigyro monitors inclination of a hull so as to cooperate with the control module and the power module to achieve safe turn.

The invention relates to a slave-main type marine environment detection intelligent robot. The slave-main type marine environment detection intelligent robot consists of two major parts: a water surface supporting main ship and an unmanned underwater vehicle, wherein the water surface supporting main ship comprises a hydraulic propeller, a small arm, a small arm rotating joint, a supporting plate, a wireless communication transceiver, a ship body, a docking gripper, a central processing cabin, a pre-positioned sensor, a monitoring cabin, a spring buffer layer, a big arm rotating joint, a big arm, a brachiopod rotating joint, a strong-force bracket and a long buoy; and the unmanned underwater vehicle comprises a stern rudder, a caudal fin, an air guide sleeve, a connecting umbilical cable, a vertical propeller, a clamping port, a horizontal propeller, a machine body, an inductor, a detector and a mounted platform.

An autonomous underwater vehicle (AUV) for recording seismic signals during a marine seismic survey. The AUV includes a body having a base and sides; a propulsion system for guiding the AUV to a final target on the ocean bottom; a pump-jet connected to an inlet and plural base outlets, wherein the plural base outlets are distributed on the base; a processor connected to the pump-jet and configured to activate the pump-jet when the base in on the ocean bottom; and a seismic sensor configured to record seismic signals. The pump-jet has a first low speed so that water jets expelled at the plural base outlets fluidize the ocean bottom underneath the base and buries the AUV.

The invention is a marine floating oil collecting ship in the technical field of ship engineering, comprising floating ship bodies and a main ship body, wherein the main ship body is fixed on two symmetrically placed floating ship bodies; each floating ship body comprises a reagent spraying device, a water spraying propeller, a self-running vehicle platform, a self-running vehicle, an oil containment boom, an oil containment boom bracket and a floating ship body storage chamber; the floating ship body storage chamber is installed in a compartment of the floating body ship; the reagent spraying device is installed on the floating ship body; the water spraying propeller is installed under the tail part of the floating body ship; the self-running vehicle platform is installed on the tail part of the floating ship body; the self-running vehicle is installed on the self-running vehicle platform on which a control signal receiver and a power device are installed; the oil containment boom bracket is fixed on the self-running vehicle platform; one end of the oil containment boom is fixedly connected with the self-running vehicle, and the other end is fixedly connected with the oil containment boom bracket. The invention can high-efficiently and globally handle large area marine oil leakage accident and is combined into the systematic marine floating oil treating technology, thereby realizing the integrated handling of the single device to the marine oil leakage accident.

The invention, which belongs to the field of ships, discloses a command-constraint-based fixed time control method for trajectory tracking of an unmanned surface vessel. Step one, collecting actual position information and actual heading information of a current unmanned surface vessel; step two, carrying out difference processing on a desired position information and the actual position information of the unmanned surface vessel to obtain position error information of the unmanned surface vessel, carrying out difference processing on a desired heading information and the actual heading information of the unmanned surface vessel to obtain heading error information of the unmanned surface vessel, and then designing a virtual control law; step three, constraining the virtual control law by using a second-order command filter; step four, designing a disturbance observer for the disturbance force of an external ocean environment; and step five, designing a fixed-time back-step controller and carrying out calculation to obtain thrust and torque information of a water-jet propeller to realize trajectory tracking controlling of the unmanned surface vessel. Therefore, the robustness of thecontrol system is guaranteed; and the capability against the unknown time-varying interference is strong.

The invention discloses a remotely-controlled waterborne rescue device which is composed of a rescue device and a remote controller, wherein the rescue device is provided with a life buoy capable of being inflated quickly; a pump-jet propulsor of the rescue device is positioned at the rear part in a shell, and a tail pipe passes through a round hole in the rear end wall of the shell to extend to the outside; the pump-jet propulsor is connected with an accumulator through an electronic speed regulator so as to supply power, and the electronic speed regulator receives a control signal of a signal receiver to regulate the speed of the pump-jet propulsor so as to control the navigational speed; a steering engine is connected with the signal receiver to receive a control instruction sent by the remote controller to change the direction of the tail pipe of the pump-jet propulsor so as to control the navigational direction of the waterborne rescue device; and the remote controller is provided with a navigational direction and navigational speed control rocker for transmitting navigational direction and navigational speed control instructions, and target feedback information is searched through a camera at the front end of the rescue device. The rescue device is simple in structure and large in operation range; the remote controller is flexible in operation and controllable in recovery; and when the rescue device sails to a target falling into water, a trigger switch is controlled by the remote controller to inflate the life buoy so as to rescue people falling into water.

The invention discloses a marine electromagnetic counter-rotating hub-type rim water jet propeller, which comprises a water spray pipe, an annular permanent magnet motor device, a counter-rotating rim propeller, a bearing assembly and a sealing assembly; wherein, the water spray pipe includes a shell The body and the water outlet and water inlet arranged at both ends of the shell; the annular permanent magnet motor device and the counter-rotating rim propeller are arranged on the shell near the water outlet; the counter-rotating rim propeller includes a first-stage rim propeller and a second-stage rim propeller The rim propeller, the first-stage rim propeller and the second-stage rim propeller are connected to each other through a bearing assembly; there are two annular permanent magnet motor devices, which are respectively arranged on the outer shell of the first-stage rim propeller and the second-stage rim propeller On the body; the annular permanent magnet motor device and the bearing assembly are provided with a sealing assembly. The invention has the advantages of high maneuverability, high propulsion efficiency, high ship stability, low vibration and noise, high strength, safety and reliability, and the like.

The invention relates to an unmanned surface vehicle, in particular to a hybrid power fast unmanned monitoring boat. The hybrid power fast unmanned monitoring boat comprises a boat body, a mast, a power and propulsion system, an energy system, a control and navigation system, a communication system and a load monitoring system, wherein the energy system and the power and propulsion system are arranged inside the boat body, the mast is arranged on the upper portion of the boat body, and a wireless and satellite communication antenna, a meteorological monitoring load and a satellite navigation terminal are arranged on the mask. The power and propulsion system comprises a diesel engine, an electric motor, an electric generator, a hybrid power gearbox and a water-jet propeller, wherein the diesel engine and the electric motor are connected with the two input ends of the hybrid power gearbox through two clutches respectively, the output end of the hybrid power gearbox is connected with the water-jet propeller, the water-jet propeller is arranged on the stern of the boat body, and the electric generator is connected with the diesel engine. The hybrid power fast unmanned monitoring boat has the advantages of achieving unmanned operation and self-propulsion observation, high-speed cruising and low-speed monitoring can be achieved by adopting hybrid power, and efficient utilization of the energy can be achieved.

The invention belongs to the field of underwater propellers, and particularly relates to a pod type electric shaftless pump jet propeller which comprises a flow guide pipe, a blade rotor, a stator anda flow guide static blade set. The stator is of a circular ring structure and is fixedly installed in an inner cavity of the flow guide pipe. The blade rotor and the flow guide static blade set are sequentially installed in an inner cavity of the flow guide pipe in the direction from the upstream end to the downstream end of the flow guide pipe, and the blade rotor is arranged in the stator in arunning fit mode. And the flow guide pipe is provided with a pod type mounting position. Complex shafting transmission installation and maintenance can be avoided, meanwhile, electric drive is adopted, the motor and the rotor blades are integrated, and the structure is simple; the flow guide static blade set is arranged to achieve the water spraying effect.

The invention discloses a smart robot for clearing off dirt on the water surface. The smart robot comprises a ship, floats, a garbage-collecting device system, a garbage storage bin, a power system, apower supply system and a main control system. The garbage-collecting device system comprises a garbage-collecting device and a flexible mechanism; the floats are clamped on two float fastening devices respectively, a turning plate is arranged on the rear side or the inner side of the garbage-collecting device, the garbage storage bin is arranged in the middle of the ship, the power system is arranged behind the garbage storage bin and comprises a motor, a drive mechanism and a water-spraying thruster inside the ship, and a steering device is arranged above the power system; the power supplysystem comprises a storage battery and a charging and discharging protection device; the main control system comprises a Bluetooth control system, a dirt recognition device, a visual image recognitionsystem and a GPS navigation system. The smart robot can automatically clear off the dirt on kinds of water surfaces instead of manual operation, improve the dirt-removing efficiency, lower the laborcost, and enhance safety.

The invention discloses a new-type magnetic energy ship, which consists of a water jet propeller and a ship body. The water jet propeller consists of a stator, a rotor, a control system and a pipeline, wherein the pipeline is connected with the ship body; the periphery of an impeller of the rotor is fixedly connected with a circular ring with a plurality of permanent magnetic poles, the stator is fixed on an external circle of the pipeline and provided with a plurality of nonmagnetic insulated teeth surrounded by enameled coils to form magnetic poles, and the stator, the rotor and the control system form a special motor; the control system consists of a rotor position sensor, a controller, a storage battery and a rectification voltage regulator, wherein the controller detects a position signal of the magnetic pole of the rotor relative to the stator teeth according to the sensor, and regularly powers each groups of coils of the stator acquired from the storage battery; the rotor rotates because the permanent magnetic poles thereof are subjected to attraction moment and exclusion moment of the magnetic poles of the stator teeth , so as to drive the impeller to push the ship to advance, and drive a generator of the motor for generating power; and the generated electricity is stored in the storage battery through the rectification voltage regulator. The new-type magnetic energy ship has the advantages of energy conservation, environmental protection, simple structure and low cost.

A watercraft steered under power by water-jet propulsion utilizes a water intake ramp in its hull to create a nozzle-like effect to accelerate water loading to the jet pump through a ventral water inlet when under power. The hull has a pair of longitudinal stabilizers that form a tunnel in which the ramp is located. A canopy, which can be removable, encloses a passenger compartment with a steering wheel and one or more passenger seats. Two wings flank the passenger compartment and a pair of hull ramps run steeply downward from the leading edge of each of the wings and extends to the bottom of the hull while a pair of air scoops flanks each side of the passenger compartment and is located above the pair of wings. The forward-most beginnings of the pair of stabilizers relative to a nose section and the pair of wings ride above the surface of the water when the watercraft is under power and the watercraft rides on the back of the pair of stabilizers. The tops of wings are curved in a configuration to give the watercraft top lift and have a reverse curve on their bottom surface relative to the surface of the water to push the hull upward and provide a faster plane for the watercraft to run on the pair of stabilizers. The engine and the driver's passenger seat rest on the center of gravity of the watercraft at the water line when the watercraft is under power.

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 body oxygen aerating and garbage refloating vessel. The water body oxygen aerating and garbage refloating vessel comprises a vessel body (1), a garbage gathering device(11), a garbage refloating transport device (3), a garbage storing device (5) and a power device (6); the water body oxygen aerating and garbage refloating vessel is further provided with a garbage compression device (4), an aerating device (7) and a remote control device; the garbage compression device compresses refloated garbage; and for the aerating device, on the basis of an original pump-jet propeller (12), a jet-flow aerating device is additionally installed at the jet pipe nozzle position to supply oxygen for the water body and to be used as an auxiliary power source. According to thewater body oxygen aerating and garbage refloating vessel, through the cooperation of two screw propellers of the power device, the rapid steering and the control over the refloating speed can be realized; and the garbage in water can be cleaned, oxygen supply can be carried out for the water body at the same time, the eutrophication of the water body can be retarded, and the pollution of the water body to the environment is greatly reduced.

A water-jet propulsion personal watercraft is disclosed, including a multiple-cylinder engine mounted in a body of the watercraft and configured to drive a water jet pump configured to propel the watercraft, and a mechanically driven supercharger configured to supply air taken in from outside to the engine. The engine typically has air-intake ports configured to open toward one side relative to the engine and exhaust ports configured to open toward an opposite side relative to the engine. The supercharger is typically disposed on the one side relative to the engine.

The invention relates to a maritime shovel-type floating oil collector, belonging to the technical field of marine floating oil treatment, wherein an air cushion, a balance wing and a floating oil inlet control device compose the mainbody structure of the collector; a fine filter screen, a gravity-type oil and water separation pool, an oil suction pump, a flexible oil storage bag and a drainage outlet compose an internal floating oil treatment system; the gravity-type oil and water separation pool is connected with the fine filter screen and the oil suction pump; the oil suction pump is connected with the flexible oil storage bag; a floating oil coagulant storage chamber and a reagent sprinkling device compose a chemical reagent sprinkling system; a water spraying propeller and a guide and remote control device compose a power and control device; an oil shovel and an oil shovel motion control mechanism compose an oil shovel system; a cloth oil boom, an oil boom bracket and a simple self-running vehicle compose an oil boom system; and the maritime shovel-type floating oil collector has the advantages of effectively and comprehensively processing the maritime oil leakage accident of large area, integrating the systemic maritime floating oil treatment technology and realizing the integrated treatment on the maritime oil leakage accidents by one device.

The invention discloses an amphibious dune buggy comprising a dune buggy. An integral floating body is fixed and connected below the chassis of the dune buggy so as to cause the whole vehicle to float on the water surface; the dune buggy is provided with a front-wheel suspension and lifting device so as to control front wheels to vertically lift and fall; the dune buggy is provided with a rear-wheel suspension and lifting device so as to control rear wheels to vertically lift and fall; the dune buggy is also provided with a water jet propeller to drive the dune buggy to forward, back off and turn in water; the water jet propeller is connected with the power of the dune buggy by a power divider which is at least provided with one input shaft and two output shafts; the input shaft is connected with the power of an engine; and one output shaft is connected to the input shaft of a rear difference device, and the other output shaft is connected to the water jet propeller. The invention can be freely switched and driven on land and on water.

The invention provides a two-way water-jet propeller based on shape memory alloys and a control method of the two-way water-jet propeller. The two-way water-jet propeller based on shape memory alloys comprises a memory alloy driving module, a two-way water-jet propulsion module, a water flow one-way distribution module and a controller, wherein the memory alloy driving module comprises a cylinder body, a piston and two shape memory alloy springs; the two-way water-jet propulsion module comprises two water-jet pipes; the water flow one-way distribution module comprises a first valve group and a second valve group; the first valve group comprises a one-way valve 1, a one-way valve 2, a two-position three-way valve 1 and a two-position three-way valve 2; the second valve group comprises a one-way valve 3, a one-way valve 4, a two-position three-way valve 3 and a two-position three-way valve 4; and the shape memory alloy springs, two-position three-way valve 1, two-position three-way valve 2, two-position three-way valve 3 and two-position three-way valve 4 are respectively connected with the controller. The noise of the two-way water-jet propeller based on the shape memory alloys is decreased, and the working efficiency is improved.

The invention relates to an overwater balance vessel, comprising a carrier sealed chamber and a carrier platform; a left footboard and a right footboard are arranged on the carrier platform, pressure sensors are distributed on each of the left and right footboards, a controller, a miniature gyroscope, a battery and a power unit are arranged in the carrier sealed chamber, the power unit comprises a spray propeller, two circular water pipes, a plurality of rotary nozzles, a direct-current motor and pull rods, the inflow end and outflow end of the spray propeller are communicated with the two circular water pipes respectively, all the rotary nozzles are extended out of the carrier seal chamber and are evenly distributed into a coil, outlets of the rotary nozzles point to the radial outlet of the circle, each rotary nozzle is communicated with the two circular water pipes through an electromagnetic valve, and each rotary nozzle is connected with the direct-current motor through one pull rod. The overwater balance vessel commanded by stepping of an operator, has the functions of self-balancing, self-maintaining, accelerating, braking, forward driving, reversing, and turning, and is simple to operate and good in safety.

A water craft comprising:an elongated hull comprising a passageway having an inlet and an outlet;a pump jet disposed within said passageway intermediate said inlet and said outlet;said pump jet being configured to receive water entering said passageway through said inlet and pump said water out of said outlet, whereby to propel said hull through water;a plurality of nozzles disposed on the outer surface of said hull, aft of said inlet, wherein said plurality of nozzles are configured to release a friction-reducing fluid, whereby the friction-reducing fluid displaces water from the surface of said hull so as to diminish friction on the outer surface of said hull and facilitate high speeds.

The invention discloses an offshore wind power intelligent inspection system which comprises a buoy and an unmanned aerial vehicle take-off and landing recovery platform. The side surface of the buoyis fixedly provided with a water jet propulsion device, and the water jet propulsion device is composed of a water jet propeller and a protective cover; the two sides of the upper surface of the buoyare connected with a deck through a front damping device and a rear damping device correspondingly, an underwater inspection device is fixedly installed on the lower surface of the deck, and the unmanned aerial vehicle take-off and landing recovery platform is fixedly installed in the middle of the upper surface of the deck; and an intelligent unmanned aerial vehicle is correspondingly arranged atthe upper end of the unmanned aerial vehicle take-off and landing recovery platform. According to the offshore wind power intelligent inspection system, a novel structural design is adopted so that the device can enable an intelligent unmanned aerial vehicle and an unmanned ship to work cooperatively, the detection range of equipment is expanded, the unmanned ship operates autonomously through awater jet propulsion structure, and the cruising efficiency is improved; and an anti-wave structure is arranged in the device, and the relative stability of the unmanned ship in the cruising process is improved.

The invention discloses a hydraulically-driven full-vector water-jet propulsor spout and belongs to the technical field of ship industry. The propulsor spout comprises a rotary blade component, swing blades, a sealing base, a rotary support sleeve, a clamping cap, a hydraulic motor and a hydraulic cylinder. Peripheral equipment is a controllable hydraulic pump system, which comprises a hydraulic pump, a control system, a hydraulic valve and a hydraulic circuit and is used for providing required power for the hydraulic motor and the hydraulic cylinder respectively according to the working conditions; the swing blades are mounted on the rotary blade component and are driven to swing by the hydraulic cylinder; and the rotary support sleeve is matched with the sealing base and the clamping cap and can rotate along the axis, and the rotary blade component is mounted on the rotary support sleeve and is driven to rotate through the hydraulic motor. The propulsor spout provided by the invention can achieve full-vector adjustment of the flow rate of a propulsor as required so as to control the propelling effort and direction of the water-jet propulsor.

The invention belongs to the field of ship design, in particular to a novel shaft-less pump-jet thruster and an underwater vehicle containing the thruster. By arranging the propeller in front of the rudder, the uniformity of the flow field at the paddle surface can be improved, and the propeller radiated noise and the hull radiated noise caused by the exciting force of the propeller can be effectively reduced. The longer transmission shaft system is omitted and the vibration of the shaft system is basically eliminated. The vortex eliminating tail fin can reduce the vortex intensity in the wakeflow, absorb the wake flow energy, and avoid cavitation. The axially-free pump propeller of the invention can be installed on various equipments such as unmanned and manned underwater vehicles, submarines, and the like, and has wide application prospects.

The invention discloses an electric duct pipe water-jet propeller. The water-jet propeller is smaller than the conventional size, has the characteristics of light weight, simple structure and easy control, and can meet the installation and control requirements of small robot platforms. The electric duct pipe water-jet propeller includes: a shell fixation unit and a motor driving unit; the shell fixation unit includes: a water inlet cover, a shell, a guide guard and a water jet cover that are coaxially connected in order; the motor driving unit includes: a motor and screw propellers; the motoris fixed inside the guide guard, and the power output shaft of the motor serves as a rotating shaft and is toward the direction of the water inlet cover, the screw propellers are connected to the rotating shaft, and rotate under the driving of the rotating shaft. The water-jet propeller with the structure provided by the invention can realize rapid underwater motion of an underwater robot and floating and submergence of a robot because of large thrust.

The invention discloses a wear-resisting corrosion-resistant composite coating for a ship water-jet propeller impeller and a preparation method thereof, belonging to the technical field of corrosion-resistant wear-resisting coatings of a metal base body. The coating is obtained by a TiC in-situ reinforced NiTi intermetallic compound-based composite coating through solid-solution and aging treatment. The preparation method of the coating comprises the following steps: (1), preparing Ni-Ti-C composite powder by taking sucrose as a precursor of carbon and taking Ti powder and hydroxyl Ni powder as materials; (2), preparing a TiC in-situ reinforced NiTi intermetallic compound-based composite coating on the surface of a stainless steel impeller of a ship water-jet propeller by taking the Ni-Ti-C composite powder as the material through a plasma-beam cladding technology; and (3), carrying out solid-solution treatment and aging treatment on the coating obtained in the step (2) to obtain the coating. The coating disclosed by the invention can greatly improve cavitation erosion resistance, wearing resistance and corrosion resistance of the stainless steel impeller of the ship water-jet impeller.