734results about "Rotary propellers" patented technology

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 provides a flow guiding device of a ship propeller and a ship. The flow guide device comprises a plurality of guide vanes, the guide vanes are fixedly connected to the stern of the ship in the circumferential direction of the propeller, and the guide vanes are arranged at different positions in the axial direction of the propeller. The guide vanes are arranged at different positions in the axial direction of the propeller, so that the stress borne by the flow guide device is reduced; by limiting the circumferential length of flow guide, the resistance borne by the flow guide device can be reduced on the premise that the stability of the structure is improved. The ship stern and the flow field around the propeller are improved, the propelling efficiency of the propeller is improved, and the pressure at the blade backs of the propeller blades can be increased, so that the stress of the propeller is increased, and the thrust component is increased accordingly; the flow field pressure at the guide vanes outside the guide wheel can be reduced, so that the flow velocity of the flow field is increased, and the propeller efficiency is improved.

The invention relates to the field of marine surveying and mapping, in particular to a marine surveying and mapping positioning device which comprises a bearing plate, a waterproof cover is mounted at the top end of the bearing plate, and one end of a rotating rod penetrates through the rear side wall of the inner top wall of a first cavity and is fixedly connected with a plurality of spiral blades at equal angles. And a positioning assembly is installed in the second cavity, a crushing assembly is installed on the side wall of the rotating rod, and a repairing assembly is installed on the side wall of the spiral blade. The positioning assembly is arranged, a motor works to drive a rotating rod and a spiral blade to rotate, thrust generated by rotation of the spiral blade is utilized to drive the device to move towards the seabed, the spiral blade pushes the device to move downwards, the device dives in the vertical direction to a great extent, displacement of the surveying and mapping device under the action of seawater flow is avoided, and the surveying and mapping efficiency is improved. Therefore, the device can be prepared to be put into the surveying and mapping range, and the practicability of the device is improved.

The invention provides a water-air two-domain self-adaptive state switching efficient propelling folding propeller, which comprises a propeller hub, a propeller blade, a propeller blade, a propeller blade and a propeller blade, the N fixed paddles are uniformly distributed on the side wall of the cylinder in the circumferential direction; the inner sides of the fixed paddles are fixedly connected with the outer surface of the side wall of the cylinder; the fixed blades are arranged along the water pushing direction; the outer side of the fixed paddle is bent upwards, and a connecting plate is arranged at the end part of the outer side; the N folding and unfolding paddles are correspondingly mounted at the outer ends of the fixed paddles, and each folding and unfolding paddle comprises a blade and a root ring fixedly connected with the root of the blade; the N rotating joints comprise pin shafts, and the pin shafts penetrate through the connecting holes and the root ring; wherein N is greater than or equal to 3; when the propeller hub rotates and is located above the water surface, the folding and unfolding blades are unfolded under the action of centrifugal force; and when the paddle is located below the water surface, the folding and unfolding paddle is folded under the action of water resistance. The efficient propelling folding paddle has sufficient propelling power in water and is high in water-air transition efficiency. The invention also provides an unmanned aerial vehicle equipped with the efficient propelling folding paddle.

Disclosed propeller assemblies can include thrust rings that are individually selectable for tuning of propeller drive performance, each one of the plurality of thrust rings can be configured for connection with the propeller hub of the propeller drive assembly as an aftward extension from the propeller hub for configuring thrust forces generated under operation of the propeller drive assembly.

A propeller. The blades of the propeller are characterized by a blade center axis which corresponds to a generator line of a cone to which the blade, or blade thrust surface, conforms. The propeller hub is fixed to the blade at the root, in line with the blade center axis, such that the hub axis and blade center axis lie in the same plane, and the leading edge of the blade is positioned forward (referring to the upstream direction of movement caused by the propeller) of the trailing edge of the blade.

The invention relates to an array type underwater propeller with high maneuverability and low energy consumption, a pump jet generating device and a flow divider jointly form a propeller front end, an intelligent fluid director forms a propeller rear end, and the pump jet generating device drives an impeller through a rotating motor to drive surrounding water flow to rotate to generate a main jet flow; an isolation structure is arranged in the flow divider and used for evenly dividing the main jet flow into multiple strands of independent sub jet flows, and all the sub jet flows form propelling power after entering the intelligent flow guider to be guided. The intelligent fluid directors are connected with the flow channels of the flow divider in a one-to-one correspondence mode and used for converting fluid flowing out of the flow divider and out of the jet flow face into effective action jet flow with the adjustable flow speed. The intelligent fluid director comprises a jet flow end regulation and control mechanism and a pressure relief end regulation and control mechanism, and the jet flow end regulation and control mechanism is used for independently regulating the flow speed of effective jet flow ejected from the fluid director; and the pressure relief end regulation and control mechanism is used for maintaining the constant flow velocity at the inlet of the fluid director by releasing part of water flow when the effective jet flow velocity is regulated.

A swimming pool cleaner is provided, which includes a housing, a travelling device and a filter screen, two groups of power components with opposite driving directions are provided inside the water outlet chamber, the power component includes an impeller and a water outlet channel, wherein the water outlet channel includes a spiral portion and a linear flowing portion which are sequentially communicated, the linear flowing portion is connected with the water outlet, and the linear flowing portion deflects to the outer side in the spiral direction of the spiral portion, a steering stressed portion is formed at the junction of the linear flowing portion and the spiral portion, and the water outlet is in communication with an outside of the housing and faces towards a direction that is opposite to the travelling direction of the travelling device.

A hydrofoil vehicle comprises a frame and at least one foil. The vehicle comprises a moveable control surface configured to control a pitch of the vehicle, in use. A locking mechanism is provided for restricting movement of the control surface when the vehicle is not foiling, for example during launching. In examples, the locking mechanism activates automatically when the hydrofoil vehicle is not foiling. In examples, the vehicle is human powered.

The invention relates to an underwater propeller, in particular to a small underwater shaftless propeller which comprises a shell, a motor assembly, an upper cover and a lower cover, a water inlet and a water outlet are formed in the middle of the lower cover and the middle of the upper cover respectively, the motor assembly comprises a stator and a rotor, propeller blades are arranged in the rotor, the stator is annular and is arranged in a sealing sleeve, and the sealing sleeve is arranged in the shell. One end of the sealing sleeve is opened, and the opening is covered and sealed by the upper cover to form a sealed cavity; water permeable holes are formed in the lower cover close to the water inlet and the upper cover close to the water outlet, the water inlet and the water outlet are each provided with a structural part, a sliding bearing assembly is arranged between the structural parts and the rotor, a gap I is formed in the sliding bearing assembly, and the gap I and the water permeable holes are communicated to form a water lubrication passage; a gap II is formed between the outer peripheral wall of the rotor and the inner ring wall of the sealing sleeve; and the gap II is communicated with the water permeable hole to form a water cooling passage. The device has the characteristics of high reliability, long service life and low maintenance cost, and is suitable for being applied to an underwater environment.

The utility model relates to the technical field of icebreaking equipment, in particular to an icebreaking mechanism matched with a propeller of an icebreaker for use, which comprises a hull connecting frame, a grinding mechanism and an ice drilling mechanism, the grinding mechanism and the ice drilling mechanism are connected with the hull connecting frame, and the hull connecting frame is fixed on the lower portion of the outer side of a bow of the icebreaker. The grinding mechanism comprises a first motor, a rotating shaft fixedly connected with and coaxial with an output shaft of the first motor and multiple sets of ice grinding wheels and ice breaking knives arranged on the rotating shaft in a sleeving mode, the two ends of the rotating shaft are rotationally connected with the hull connecting frame respectively, and the ice grinding wheels and the ice breaking knives are fixedly connected with the rotating shaft. The ice drilling mechanism comprises a mounting frame, a lifting mechanism arranged on the mounting frame, a rotating mechanism connected with the lifting mechanism and an ice breaking drill bit connected with the rotating mechanism and located in front of the grinding mechanism, the lifting mechanism drives the rotating mechanism to move up and down in the vertical direction, and the rotating mechanism drives the ice breaking drill bit to rotate in the horizontal direction. The icebreaking mechanism can solve the technical problems that an existing icebreaker is low in icebreaking efficiency and high in energy consumption.

The invention provides a blade-fused full-rotation shaftless rim propeller, and relates to the technical field of propellers, the blade-fused full-rotation shaftless rim propeller comprises a propeller body, the propeller body comprises a propeller shell, a first driving mechanism and a blade assembly, and the propeller shell is provided with a cylindrical mounting shell and a containing space located on the inner side of the mounting shell; the first driving mechanism comprises a stator assembly and a rotor assembly which are coaxially arranged on the inner side of the accommodating space; the paddle assembly comprises a plurality of main paddles and a plurality of auxiliary paddles, the main paddles are evenly distributed along the inner circumference of the rotor assembly, the guide edges of the main paddles are of zigzag bionic structures, the auxiliary paddles are located between the adjacent main paddles, the chord length of the auxiliary paddles is 30%-50% of the chord length of the main paddles, and the front edges of the auxiliary paddles are arranged close to the guide edge sides of the main paddles. Through the collaborative design of the main paddle and the auxiliary paddle, the sawtooth-shaped guide edge is used for damaging the vortex continuity, the auxiliary paddle guides secondary flow and inhibits pressure fluctuation, and the technical problems that a traditional propeller is high in noise, low in efficiency and disordered in flow field in a closed flow channel environment are solved.

The invention belongs to the technical field of robots, and relates to a bionic robotic fish coupled with fish luring factors, which is characterized in that a fish head, a fish body, a tail fin and a dorsal fin form a robotic fish shell; the robot further comprises two discharge electrodes, a communication module, two obstacle avoidance sensors, a water pump, two RGB lamps, three joint steering engines, a propeller thruster, two loudspeakers, a balance weight adjusting bin, a control circuit board, a battery, a water bin and a high-pressure air bin. Three fish luring factors including sound, light and electricity are coupled to the robotic fish, the combination mode of the factors is reasonably regulated, controlled and optimized, the fishes are guided to gather, the fishway entrance is found, the recognition ability of the fishes to fish passing facilities is enhanced, and the use efficiency of the fishway is improved. The method helps the migration of the rare fish fingerlings, protects the reproduction of the rare fishes, maintains the stability of fish populations, is beneficial to the protection and restoration of the ecological environment of the fishes, and walks the way of ecological priority and green development on the basis of the development of water conservancy projects.

The invention provides an unpowered hydrofoil surfboard auxiliary power device which comprises a mounting plate fixedly arranged on the bottom face of a surfboard and an auxiliary power assembly fixedly connected with the mounting plate, and at least one first mounting hole is formed in the mounting plate. First mounting holes are formed in the mounting plate and correspond to fasteners for fixedly connecting the mast and the surfboard in a one-to-one mode, the first mounting holes matched with the original fasteners are formed in the mounting plate, the mast penetrates through the mounting plate through the fasteners to be connected with the surfboard, and therefore the situation that the overall strength of the surfboard is affected by the strength of the auxiliary device is avoided; and the thickness of the auxiliary device does not cause the defect that the gravity center moves upwards to influence user operation.

The invention provides a flap propeller which comprises a propeller hub, a propeller shaft connected with one end of the propeller hub and a plurality of blades arranged on the propeller hub and evenly arranged at intervals in the circumferential direction of the propeller hub, a mounting groove is formed in the side, facing the adjacent blade, of each blade, and a flap is arranged in each mounting groove. The flaps are rotationally connected with the corresponding blades and / or the propeller hubs; the flap propeller further comprises a rotation driving assembly, and the rotation driving assembly is arranged on the propeller hub and connected with the flap so as to drive the flap to rotate relative to the propeller blades. The device can adapt to various navigation working conditions, reduces the loss of ship energy and inhibits the cavitation phenomenon.

The present disclosure relates to a vessel propelling mechanism. In one aspect, a vessel propelling system includes a motor and a waterjet system. The waterjet system is coupled to the motor and includes a stator with a plurality of blades. A first blade of the plurality of blades has a shape that is different than remaining blades of the plurality of blades, the shape of the first blade allowing a driving mechanism of the motor to be coupled to a shaft within the waterjet system.

The invention discloses a shaftless rim propeller with bearing and motor integrated driving steering. The shaftless rim propeller comprises a full-rotation device and a shaftless rim propelling unit. The full-rotation device comprises a main shell assembly and a full-rotation motor, the full-rotation motor is sleeved with the main shell assembly, the full-rotation motor comprises a water-lubricated bearing rotor and a first permanent magnet, and the first permanent magnet is embedded into the water-lubricated bearing rotor; the shaftless rim propelling unit comprises a propeller shell assembly, a spherical driving motor and blades, the propeller shell assembly is arranged on the outer side of the spherical driving motor in a sleeving mode and connected with the main shell assembly, and the spherical driving motor is in transmission connection with the blades. The structure of the full-rotation device is simplified, the structure is compact, a transmission mechanism is omitted, the full-rotation device is driven by the motor, and the full-rotation efficiency of the full-rotation device is improved. The three-degree-of-freedom rotation characteristic of the spherical motor is utilized, the propelling direction of propagation is adjusted in any direction, the propelling efficiency is improved, and the maneuverability of the ship under the non-design working condition is improved.

The invention discloses an air-water rotating speed coordination vector propeller based on a one-way transmission and a variable pitch structure, belongs to the field of application of water-air cross-domain aircrafts, and aims to solve the problem that a propelling device of an existing water-air cross-domain aircraft is difficult to switch working rotating speeds and adjust working postures in two fluids. In order to solve the problem of low navigation efficiency of the water-air cross-domain aircraft, the invention firstly provides a mode of coupling a one-way speed change module, a vector platform module and a variable-pitch paddle module to construct the propulsion device of the water-air cross-domain aircraft. Wherein the one-way speed change module can provide a high-speed rotating speed or a low-speed rotating speed for a transmission part at the platform end of the vector platform module according to forward rotation or reverse rotation of a driving motor, and the vector platform module is used for adjusting the overall working angle of the variable-pitch paddle module and adjusting the overall movement posture and movement trajectory of the aircraft. And the variable-pitch blade module is used for adjusting the working angle of a propeller blade carried by the variable-pitch blade module. The propulsion device is mainly used as a propulsion device of a water-air cross-domain aircraft.

The present invention relates to a gearbox system for mounting on a hydrofoil (18) for a waterborne vessel (10), the gearbox system comprising: a housing (60) having an interior surface defining an interior space of defined dimension; a gearing system comprising a gear box (44) located within the interior of the housing; a propeller shaft (33) engagement portion (35), the gearing system located within the interior of the housing; and an engine (42) located within the interior space of the housing and in mechanical communication with the gear box; wherein the housing is water-tight and wherein the gearing system and engine are in thermal contact with the interior surface of the housing. Further provided is a hydrofoil system including such a gearbox system and a waterborne vessel including such a hydrofoil system.

The shaftless propeller comprises a motor shell, a rotating cylinder, the hub-free guide vane, a steering nozzle and a sealed bearing assembly, the motor shell coaxially sleeves the rotating cylinder, an annular motor used for driving the rotating cylinder to rotate is arranged between the motor shell and the rotating cylinder, and the hub-free guide vane is arranged between the motor shell and the rotating cylinder. The rotating cylinder comprises a plurality of blades arranged on the inner wall of the rotating cylinder and a distance adjusting mechanism used for changing the pitch of the blades in the operation process, and the hub-free guide vane is fixedly arranged at a water inlet in the front end of the rotating cylinder and used for conducting pre-rotation rectification on water flow entering the rotating cylinder so as to counteract the circumferential induced speed generated by the rotating cylinder. The steering nozzle is arranged at the outlet end of the rotating cylinder and can be driven to deflect around the axis so as to change the jet flow direction, and the sealing bearing assembly is arranged between the motor shell and the rotating cylinder and used for supporting the rotating cylinder and preventing fluid from invading the interior of the motor shell; the propulsion efficiency can be improved, the vibration noise can be reduced, and the steering function can be integrated.

The invention discloses a ship propeller energy-saving rectifying device with diversion wings, and particularly relates to the technical field of ships, the ship propeller energy-saving rectifying device comprises a ship body, a driving rod is arranged at the rear end of the ship body, a propeller is arranged at the rear end of the driving rod, and a plurality of diversion wings are fixedly installed on the outer wall of the driving rod in an annular array mode. An L-shaped fixing support is arranged above the driving rod, the L-shaped fixing support is installed on the rear side of the ship body, a rectifying mechanism is installed at the bottom end of the vertical position of the L-shaped fixing support, the rectifying mechanism comprises an annular flow guide cover, and the propeller is located on the inner side of the annular flow guide cover. According to the ship propeller energy-saving rectifying device with the flow guide wings, through the synergistic effect of the flow guide wings and the rectifying mechanism capable of being dynamically adjusted, the inflow condition of the disc face of the propeller is improved, pre-rotation and non-uniformity of water flow are effectively weakened, and therefore the propelling efficiency of the propeller is improved, and fuel consumption and operation cost are reduced.

The invention relates to the technical field of energy-saving devices in the field of ship engineering, and discloses an annular fin blade propeller cap turbine and a ship hull. The annular fins are uniformly distributed on the periphery of the light cap; the wing-shaped rotating direction of the annular fin blades is consistent with that of the propeller; the annular fin blades and the light caps form an annular closed area, and tip leakage is prevented. The annular fin tip prevents tip discharge, flow fields of the front fin blade and the rear fin blade are separated in advance near the annular fin tip, and cannot be fused to form vortex after being transversely scattered by the fin tip, so that the energy-saving effect is enhanced.

The differential pressure driven propeller micro-nano air curtain noise reduction system comprises a gas-liquid mixing cavity and a high-speed stirrer, and the gas-liquid mixing cavity is arranged in the internal space of the tail of an aircraft; the high-speed stirrer is arranged in the gas-liquid mixing cavity; the gas-liquid mixing cavity is provided with a gas inlet, a water inlet and a micro-nano bubble outlet, the diameter of the water inlet is D1, and the diameter of the micro-nano bubble outlet is D2; the included angle between the tangent line of the molded line at the micro-nano bubble outlet and the central axis of the aircraft is alpha, and the angle between the micro-nano bubble outlet and the central axis of the aircraft is-alpha; the center-to-center distance between the water inlet and the micro-nano bubble outlet is D3, and D3 is larger than 6 * D1 and larger than 3 * D2; when the spraying speed V3 of the micro-nano bubbles is equal to V / cos alpha, the micro-nano bubbles enter a potential flow area and spread downstream along the streamline of the aircraft, and a micro-nano air curtain is formed and wraps the periphery of the propeller. A micro-nano air curtain is formed around the propeller, acoustic impedance is increased to cause acoustic wave transmission loss, and the radiation noise of the propeller is reduced.

The variable-configuration multi-purpose robot comprises a robot body and the wheel-claw-paddle composite mechanism, the robot body comprises a robot body, an upper cover plate and two side plates, the upper cover plate is fixed to the robot body, and the two side plates are rotatably arranged on the two sides of the cover plate through two hinges correspondingly; the hinge is a rotary damping adjustable hinge; the wheel-claw-paddle composite mechanism is allowed to be switched between a wheel-claw-paddle state and a wheel-type state, the wheel-claw-paddle composite mechanism is arranged on the side plate so that the side plate can rotate and be locked relative to the upper cover plate within a set angle range, and then the whole machine can be switched among a flight mode, a ground mode and a water surface mode. The device can adapt to water, land and air triphibian environments at the same time and is integrated with light-weight design.

The invention relates to a hydrodynamic energy-saving device for a pump-jet propeller, comprising: a rotor blade which is a main output component and is used for receiving energy and outputting thrust; the front stator blade is a static part and is mainly used for improving the inflow of the rotor blade and improving the efficiency of the rotor blade; the guide pipe is a static part, is mainly used for integrating a flow field and can be used for providing additional thrust, and the appropriate guide pipe wing type can also be used for improving the cavitation performance of the rotor; the hub cap fin blades rotate along with the rotor blades, so that hub vortex energy loss of the propeller hub of the pump-jet propeller can be reduced, a low-pressure area behind the propeller hub is eliminated, and the hydrodynamic performance is improved; and the propeller hub is used for fixedly connecting the rotor blades and the hub cap fin blades. According to the hydrodynamic energy-saving device for the pump jet propeller, the flow field behind a hub can be improved, the thrust of the propeller can be increased, the torque of rotor blades can be reduced, and the purpose of improving the hydrodynamic performance is achieved.

The present invention is an amphibious detection snake based on bionics. The present invention relates to the technical field of amphibious detection snakes. The present invention is mainly composed of an STM32F103ZET6 single-chip microcomputer main control component, a MIPI camera, an ESP8266WIFI module, a universal wheel, a servo, etc. The present invention can automatically switch between land mode and water mode according to changes in the external environment. When in land mode, the driving motor is driven by the main control component, and the rotation of the servo between the snake joints drives the universal wheel to generate forward rotational power, thereby realizing two-dimensional forward movement. When in water mode, the propeller automatically pops up, and multi-dimensional movement can be realized quickly. The camera detects real-time images in the water and transmits data to the remote control terminal according to the serial communication protocol. Based on the bionic principle, the present invention imitates the movement posture of the snake during movement to have better camouflage, and can realize reconnaissance and detection in a variety of environments.

The marine propeller cap turbine with the end plate on the fin tip comprises a propeller cap turbine body, a propeller and a connecting structure, and six evenly-distributed fin blades are arranged on the propeller cap turbine body; the tip part of each fin is provided with an end plate opposite to the rotating direction; the connecting structure comprises twelve bolts which are used for fixedly connecting the propeller cap turbine body with a propeller hub of a propeller, and the circumferential installation position of the propeller cap turbine can be adjusted at will. According to the propeller cap turbine with the fin tip provided with the end plate, for a ship running on a ship route, the mode of installing the propeller cap turbine behind the propeller is an energy-saving mode capable of effectively saving oil consumption, and the problems that according to traditional propeller cap turbine design, the relative position between the fin blades and the propeller blades needs to be considered, certain difficulty and risks are brought to design and installation, and the design cost is lowered are solved. And the blade tip of the traditional fin blade discharges, so that the vortex energy recovery capability of the fin blade is reduced, and the synergistic effect is not obviously improved.

The present invention relates to the field of marine surveying and mapping, and specifically to a marine surveying and mapping positioning device, which includes a bearing plate. A waterproof cover is installed at the top of the bearing plate. One end of the rotating rod penetrates the rear side wall of the inner top wall of the first cavity and is fixedly connected with a plurality of spiral blades at equal angles. A second cavity is formed in the inner wall of the weight block, and a positioning component is installed inside the second cavity. A crushing component is installed on the side wall of the rotating rod, and a repair component is installed on the side wall of the spiral blade. By setting the positioning component, through the operation of the motor, the rotating rod and the spiral blades are driven to rotate. Using the thrust generated by the rotation of the spiral blades, the device is driven to move towards the seabed. By pushing the device downward through the spiral blades, the device dives vertically to a great extent, avoiding displacement and even deviation from the surveying area of the surveying device under the action of seawater flow, ensuring that the device can be accurately placed within the surveying range, and improving the practicability of the device.

Methods and systems are provided for nautical stationkeeping of free-floating objects. In one example, a method includes adjusting translational motion of a body freely floating in water by rotating the body. The translational motion may be adjusted, for instance, to maintain the body within a geographic area. In certain examples, the adjustment of the translational motion may be realized via a Magnus effect induced by rotating the body. The body may be configured as, for example, a free-floating object such as a wave engine.

A ship propulsion machine (1) includes a propeller (2), an engine (4) configured to rotate the propeller (2), the engine (4) serving as a first power source, a motor (17) configured to rotate the propeller (2), the motor (17) serving as a second power source, an inverter (19) configured to control driving of the motor (17), an engine drive shaft (21) connected to a crank shaft (6) of the engine (4), a motor drive shaft (22) connected to an output shaft (18) of the motor (17), a transmission shaft (23) connected to a propeller shaft (3) provided with the propeller (2), and a power switching mechanism (24) configured to switch a connection mode of the engine drive shaft (21), the motor drive shaft (22), and the transmission shaft (23) to switch a power source for rotating the propeller (2) between the engine (4) and the motor (17).