Underwater propeller device

Abstract

The utility model discloses an underwater propeller device. The underwater propeller device comprises a hydraulic motor, an intermediate shaft, an impeller, a flow deflector and a flow guide cover; the intermediate shaft is in transmission connection with the output end of the hydraulic motor; the impeller sleeves the periphery of the intermediate shaft and is in transmission connection with the intermediate shaft; the flow deflector and the impeller are coaxially arranged and located on the side, away from the hydraulic motor, of the impeller; the flow guide cover is arranged on the periphery of the flow guide piece in a sleeving mode and connected with the hydraulic motor and the middle shaft. The flow deflector and the flow guide cover are arranged at the tail of the impeller, when the hydraulic motor drives the impeller to rotate through the middle shaft, water flow sucked from the head of the impeller passes through blade gaps of the impeller, is thrown on the inner wall of the flow guide cover in an accelerated mode under the action of centrifugal force and is sprayed out from the tail of the flow guide cover along the flow deflector, and certain thrust is formed; therefore, the propelling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, in particular to an underwater propeller device. Background Art

[0002] Most existing ships and submarines use propellers as propulsion systems, relying on the interaction between the propeller's rotation and the water to generate thrust for propulsion. However, during navigation, ships and submarines inevitably experience displacement resistance. This resistance, primarily due to friction between the water flow and the hull's displacement of water, negatively impacts the navigation efficiency of ships and submarines, often failing to meet design expectations.

[0003] Furthermore, common impeller propulsion systems have limitations. Because their thrust is often dispersed and unfocused, propulsion efficiency is affected. This dispersal of thrust means some energy is wasted in directions other than forward, reducing overall propulsion efficiency. This is particularly true in complex hydrological conditions, such as those with turbulent water or uneven water density, which can further challenge propulsion performance.

[0004] In summary, existing thrusters have technical problems such as thrust dispersion and insufficient propulsion efficiency. Utility Model Content

[0005] The purpose of this application is to overcome the above technical deficiencies and propose an underwater propulsion device to solve the technical problems of thrust dispersion and insufficient propulsion efficiency in the prior art.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions:

[0007] The present application provides an underwater propulsion device, including a hydraulic motor, an intermediate shaft, an impeller, a guide vane, and a guide cover:

[0008] Hydraulic motor;

[0009] an intermediate shaft, the intermediate shaft being transmission-connected to an output end of the hydraulic motor;

[0010] an impeller, the impeller being sleeved on the periphery of the intermediate shaft and being in driving connection with the intermediate shaft;

[0011] a guide vane, the guide vane being coaxially arranged with the impeller and located on a side of the impeller away from the hydraulic motor;

[0012] A deflector cover is sleeved on the periphery of the deflector plate and is respectively connected to the hydraulic motor and the intermediate shaft.

[0013] In some embodiments of the present application, an intermediate connector and a mounting plate are further included, one end of the intermediate connector is bolted to the air duct, the other end of the intermediate connector is connected to the mounting plate, and the mounting plate is connected to the hydraulic motor.

[0014] In some embodiments of the present application, the mounting plate is annularly sleeved around the periphery of the output shaft of the hydraulic motor.

[0015] In some embodiments of the present application, the intermediate connector includes a shell and a plurality of connecting columns. The shell is annularly sleeved on the periphery of the impeller, and the two ends of each connecting column are respectively connected to the outer surface of the mounting plate and the outer surface of the shell.

[0016] In some embodiments of the present application, a shaft sleeve is further included, which is coaxially arranged with the output shaft of the hydraulic motor and the intermediate shaft, and the two ends of the shaft sleeve are respectively key-connected with the output shaft of the hydraulic motor and the intermediate shaft.

[0017] In some embodiments of the present application, the inner surface of the impeller has a protruding flat key, the outer surface of the intermediate shaft has a recessed keyway, and the impeller and the intermediate shaft are connected via the flat key and the keyway.

[0018] In some embodiments of the present application, a nut is further included, and the intermediate shaft is connected to the impeller through the nut, and the extension direction of the nut is parallel to the axial direction of the intermediate shaft.

[0019] In some embodiments of the present application, a bearing is further included, and the bearing is sleeved on the end portion of the intermediate shaft facing the air duct.

[0020] In some embodiments of the present application, a ball head is further included, which is located on the inner side of the air guide cover and covers the axis of the air guide plate.

[0021] In some embodiments of the present application, an oil seal and a sealing ring are further included, wherein the oil seal covers the side of the bearing facing the hydraulic motor, and the sealing ring covers the side of the bearing facing the ball head.

[0022] Compared with the existing technology, the technical solution provided by this application brings the following beneficial technical effects:

[0023] This application arranges a guide vane and a guide cover at the tail of the impeller. When the hydraulic motor drives the impeller to rotate through the intermediate shaft, the water flow sucked in from the impeller head passes through the gap between the impeller blades, and is accelerated by centrifugal force and thrown onto the inner wall of the guide cover. It is then ejected from the tail of the guide cover along the guide vane, forming a certain thrust, pushing the hull forward, and improving the propulsion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in this application, the following briefly introduces the drawings required for use in the embodiments:

[0025] Figure 1 This is a structural diagram of an underwater propulsion device provided in an embodiment of the present application;

[0026] Figure 2 It is a cross-sectional schematic diagram of an underwater propulsion device provided in an embodiment of the present application.

[0027] Reference numerals:

[0028] Hydraulic motor 1, intermediate shaft 2, impeller 3, guide vane 4, guide cover 5, intermediate connector 6, mounting plate 7, sleeve 8, flat key 9, sealing ring 10, nut 11, ball head 12, oil seal 13, bearing 14, shaft support 15. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0030] Those skilled in the art will understand that in this specification, the wording "including" is an open-ended expression, which means that the described features exist but does not exclude other features. The directional words "up", "down", "left", "right", etc. are exemplary directions based on the drawings. Features defined as "first" and "second" implicitly include one or more of the features. Singular expressions can also be used in the plural. "Multiple" means two or more. The terms "installed", "connected", and "connected" can be fixed connections, detachable connections, or integrated connections; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. In addition, "connected" can include wireless connections.

[0031] The purpose of this application is to overcome the above technical deficiencies and propose an underwater propulsion device to solve the technical problems of thrust dispersion and insufficient propulsion efficiency in the prior art.

[0032] In order to achieve the above technical objectives, this application adopts the following technical solutions:

[0033] The present application provides an underwater propulsion device, such as Figure 1 and Figure 2 As shown, Figure 1 This is a structural diagram of an underwater propulsion device provided in an embodiment of the present application;

[0034] Figure 2It is a cross-sectional schematic diagram of an underwater propulsion device provided in an embodiment of the present application.

[0035] An underwater propulsion device includes a hydraulic motor 1, an intermediate shaft 2, an impeller 3, a guide vane 4, and a guide cover 5:

[0036] Hydraulic motor 1;

[0037] an intermediate shaft 2, the intermediate shaft 2 being transmission-connected to the output end of the hydraulic motor 1;

[0038] an impeller 3, said impeller 3 being sleeved on the periphery of said intermediate shaft 2 and being in driving connection with said intermediate shaft 2;

[0039] a guide vane 4, the guide vane 4 being coaxially arranged with the impeller 3 and located on a side of the impeller 3 away from the hydraulic motor 1;

[0040] The deflector 5 is sleeved on the periphery of the deflector 4 and is connected to the hydraulic motor 1 and the intermediate shaft 2 respectively.

[0041] The present application arranges a guide vane 4 and a guide cover 5 at the tail of the impeller 3. When the hydraulic motor 1 drives the impeller 3 to rotate through the intermediate shaft 2, the water flow sucked from the head of the impeller 3 passes through the gap between the blades of the impeller 3 and is accelerated by the centrifugal force and thrown onto the inner wall of the guide cover 5. It is then ejected from the tail of the guide cover 5 along the guide vane 4, forming a certain thrust, pushing the hull forward, and improving the propulsion efficiency.

[0042] The hydraulic motor 1 serves as a power source, providing rotational power. The output end of the hydraulic motor 1 is connected to the intermediate shaft 2 through a transmission connection, transmitting power to the impeller 3. The impeller 3 is mounted on the periphery of the intermediate shaft 2, is connected to the intermediate shaft 2 through a transmission connection, and rotates with the intermediate shaft 2. When the impeller 3 rotates, water is sucked in from the head of the impeller 3. The water flows through the gap between the blades of the impeller 3 and is accelerated by the centrifugal force. The accelerated water flow is thrown onto the inner wall of the fairing 5 and ejected from the tail of the fairing 5 along the guide vane 4. The ejected water flow forms a certain thrust. According to Newton's third law, this backward jet force generates a forward thrust, pushing the hull forward.

[0043] The design of the guide vanes 4 and shroud 5 effectively guides and accelerates water flow, reducing energy loss and improving propulsion efficiency. The guide vanes 4 are coaxially arranged with the impeller 3, ensuring smooth water flow and reducing turbulence and resistance. The shroud 5 not only guides the flow but also protects the impeller 3 from direct impact from external objects. By adjusting the speed of the hydraulic motor 1 and the blade angle of the impeller 3, the propulsion system can be adapted to different propulsion requirements and navigation conditions.

[0044] In some embodiments of the present application, an intermediate connector 6 and a mounting plate 7 are further included, one end of the intermediate connector 6 is bolted to the air deflector 5, the other end of the intermediate connector 6 is connected to the mounting plate 7, and the mounting plate 7 is connected to the hydraulic motor 1.

[0045] The intermediate connector 6 serves as the backbone of the entire underwater propulsion system. One end of the intermediate connector 6 is bolted to the fairing 5, forming the rear end structure of the propulsion system. The other end of the intermediate connector 6 is connected to a mounting plate 7, which secures and supports the hydraulic motor 1. The hydraulic motor 1 is mounted on the mounting plate 7, and its output shaft is connected to the intermediate shaft 2 via a bushing 8 or other transmission device. The design of the mounting plate 7 facilitates the installation and replacement of the hydraulic motor 1 and provides stable support for the entire system.

[0046] Intermediate shaft 2 passes through intermediate connector 6, with one end connected to hydraulic motor 1 and the other to impeller 3. Impeller 3 is fixed to intermediate shaft 2. When hydraulic motor 1 is operating, it drives impeller 3 to rotate via intermediate shaft 2. As impeller 3 rotates, it draws in water and accelerates it backward through its blades. The water flows through guide vanes 4 and shroud 5, forming a concentrated jet stream, generating thrust.

[0047] The design of the intermediate connector 6 and mounting plate 7 enhances the overall stability of the device, reducing vibration during underwater operation and improving durability. The bolted connection allows for quick disassembly and assembly, facilitating repair and replacement of the propeller. The structural design of the intermediate connector 6 and mounting plate 7 helps distribute and withstand the stresses generated during underwater operations, enhancing device safety. The optimized design of the deflector 5 and deflector vanes 4 more efficiently converts water flow into thrust, improving propulsion efficiency.

[0048] In some embodiments of the present application, the mounting plate 7 is annularly sleeved around the periphery of the output shaft of the hydraulic motor 1 .

[0049] The annular mounting plate 7 is designed to fit around the output shaft of the hydraulic motor 1, securing the hydraulic motor 1 to a designated position on the intermediate connector 6. The output shaft of the hydraulic motor 1 passes through the annular mounting plate 7 and is connected to the intermediate shaft 2 via a bushing 8 or other transmission connector. The annular mounting plate 7 is connected to the intermediate connector 6 via bolts or other fastening devices, ensuring stable installation of the hydraulic motor 1. The design of the annular mounting plate 7 helps balance the forces acting on the hydraulic motor 1, reducing vibration and improving the overall performance of the thruster.

[0050] In some embodiments of the present application, the intermediate connector 6 includes a shell and a plurality of connecting columns. The shell is annularly sleeved on the periphery of the impeller 3, and the two ends of each connecting column are respectively connected to the outer surface of the mounting plate 7 and the outer surface of the shell.

[0051] The intermediate connector 6 consists of a housing and multiple connecting columns. The housing is annular and fits around the periphery of the impeller 3, providing structural support for the propeller. The connecting columns are connected at both ends to the outer surfaces of the mounting plate 7 and the housing, respectively, providing support and fixing, effectively transmitting and distributing the force of the hydraulic motor 1 and the rotational power of the impeller 3. The hydraulic motor 1 is connected to the housing via the mounting plate 7 and the connecting columns, forming a stable mechanical structure. The design of the housing and connecting columns helps protect internal components, such as the bearings 14 and seals, from the ingress of water and other impurities.

[0052] The housing and connecting rod design provide excellent structural strength and stability, making it suitable for use in complex underwater environments. Multiple connecting rods help evenly distribute the stress generated by the hydraulic motor 1 and impeller 3, reducing localized wear and vibration. The annular design of the housing protects the internal bearings 14 and seals, extending the service life of these vulnerable parts.

[0053] In some embodiments of the present application, a shaft sleeve 8 is further included, which is coaxially arranged with the output shaft of the hydraulic motor 1 and the intermediate shaft 2, and the two ends of the shaft sleeve 8 are respectively key-connected with the output shaft of the hydraulic motor 1 and the intermediate shaft 2.

[0054] Bushing 8 is a coaxial component that connects the output shaft of hydraulic motor 1 and intermediate shaft 2, ensuring smooth power transmission between them. One end of bushing 8 is connected to the output shaft of hydraulic motor 1 via a key. The key is a transmission connector that prevents axial and circumferential movement of bushing 8 relative to the output shaft. The other end of bushing 8 is also connected to intermediate shaft 2 via a key, also serving to secure and transmit power.

[0055] When the hydraulic motor 1 is started, its output shaft rotates, transmitting the rotational power to the intermediate shaft 2 through the sleeve 8 and key. The intermediate shaft 2 then rotates the impeller 3, which generates thrust by sucking and ejecting water, propelling the underwater device forward.

[0056] Bushing 8 and the keyed connection ensure precise alignment and transmission between the output shaft of hydraulic motor 1 and intermediate shaft 2, minimizing energy loss. The coaxial design of bushing 8 ensures efficient power transmission and reduces vibration and wear caused by misalignment. Bushing 8 can withstand moderate axial and radial loads, minimizing direct contact between the output shaft of hydraulic motor 1 and intermediate shaft 2, thereby extending the service life of these components.

[0057] In some embodiments of the present application, the inner surface of the impeller 3 has a protruding flat key 9, the outer surface of the intermediate shaft 2 has a recessed keyway, and the impeller 3 is connected to the intermediate shaft 2 via the flat key 9 and the keyway.

[0058] The inner surface of the impeller 3 is designed with a raised flat key 9, while the outer surface of the intermediate shaft 2 is correspondingly designed with a recessed keyway. When assembling the propeller, the flat key 9 of the impeller 3 is inserted into the keyway of the intermediate shaft 2, so that the impeller 3 and the intermediate shaft 2 are fixed and connected in transmission through the cooperation of the flat key 9 and the keyway. After the hydraulic motor 1 is started, its output shaft transmits the rotational power to the intermediate shaft 2 through the shaft sleeve 8 and the key. When the intermediate shaft 2 rotates, the impeller 3 will also rotate due to the connection between the keyway and the flat key 9 between the impeller 3 and the intermediate shaft 2. During the rotation of the impeller 3, the water flow is sucked in and accelerated backward through the blades, thereby generating thrust, which propels the underwater device forward.

[0059] The flat key 9 and keyway connection is a traditional mechanical connection method with a simple structure and reliable connection. The combination of the flat key 9 and keyway effectively transmits rotational power, reduces energy loss, and improves transmission efficiency. The design of the flat key 9 and keyway helps maintain the alignment of the impeller 3 and the intermediate shaft 2, reducing vibration and noise during operation.

[0060] In some embodiments of the present application, a nut 11 is further included, and the intermediate shaft 2 is connected to the impeller 3 through the nut 11 , and an extending direction of the nut 11 is parallel to the axial direction of the intermediate shaft 2 .

[0061] The inner surface of the impeller 3 has a raised flat key 9, while the outer surface of the intermediate shaft 2 has a corresponding recessed keyway. When the impeller 3 is installed on the intermediate shaft 2, the flat key 9 is inserted into the keyway. This connection method mainly limits the axial position between the impeller 3 and the intermediate shaft 2, preventing the impeller 3 from axially moving on the shaft.

[0062] Intermediate shaft 2 has a threaded portion, and impeller 3 is secured to it via nut 11. When nut 11 is tightened, its extension is parallel to the axis of intermediate shaft 2. This connection primarily limits the radial position of impeller 3 relative to intermediate shaft 2, preventing radial movement or loosening of impeller 3 on the shaft.

[0063] When the hydraulic motor 1 is started, power is transmitted to the impeller 3 through the output shaft, sleeve 8, and intermediate shaft 2. Because the axial and radial positions between the impeller 3 and the intermediate shaft 2 are restricted, the impeller 3 can rotate stably, effectively converting the kinetic energy of the water flow into thrust, propelling the underwater device forward.

[0064] The key connection and nut 11 work together to provide dual fixation between the impeller 3 and the intermediate shaft 2, significantly improving the reliability and stability of the connection. The key connection prevents axial movement, while the nut 11 prevents radial movement, ensuring that the impeller 3 does not move relative to the intermediate shaft 2 during high-speed rotation. This stable connection reduces energy loss and improves the propeller's transmission efficiency.

[0065] In some embodiments of the present application, a bearing 14 is further included. The bearing 14 is sleeved on the end of the intermediate shaft 2 facing the air deflector 5 .

[0066] The bearing 14 is sleeved on the end of the intermediate shaft 2 facing the air guide cover 5. The function of the bearing 14 is to support the intermediate shaft 2, reduce friction and wear of the shaft during rotation, and maintain the rotation accuracy of the shaft.

[0067] When the hydraulic motor 1 is started, its power is transmitted to the impeller 3 through the intermediate shaft 2. A bearing 14 is located at one end of the intermediate shaft 2, allowing the intermediate shaft 2 to rotate within the bearing 14 without directly contacting the shroud 5, thereby reducing friction and wear.

[0068] Impeller 3 rotates driven by intermediate shaft 2, sucking in water and accelerating it through the blades to generate thrust. Bearing 14 ensures a smooth process, without vibration or deviation of intermediate shaft 2 affecting propulsion efficiency.

[0069] The presence of bearing 14 significantly reduces friction between intermediate shaft 2 and shroud 5, improving the overall efficiency of the propeller. Because bearing 14 bears the rotational load of intermediate shaft 2, wear on the shaft and shroud 5 is reduced, thereby extending the propeller's service life. Bearing 14 maintains the rotational accuracy of intermediate shaft 2, ensuring stable operation of impeller 3 and improving propeller performance. Bearing 14 also absorbs and dissipates vibrations generated during rotation, reducing their impact on the ship's structure.

[0070] In some embodiments of the present application, a ball head 12 is further included. The ball head 12 is located on the inner side of the air guide cover 5 and covers the axis of the air guide plate 4 .

[0071] The ball head 12 is located on the inner side of the deflector cover 5 and covers the axis position of the deflector blade 4. The ball head 12 is a spherical component that can cooperate with the deflector blade 4 or the end of the intermediate shaft 2.

[0072] When the hydraulic motor 1 drives the intermediate shaft 2 and the impeller 3 to rotate, the water flow sucked in by the impeller 3 is accelerated and thrown toward the inner wall of the deflector 5. The design of the ball head 12 helps optimize the direction of the water flow, reduce eddy currents and energy loss, and thus improve propulsion efficiency.

[0073] The design of the ball head 12 helps create a more streamlined water flow path, reducing water resistance and improving propulsion efficiency. The ball head 12 optimizes the direction of the water jet, making the thrust generated by the propeller more concentrated and effective. The ball head 12 prevents debris from entering the gap between the guide vane 4 and the intermediate shaft 2, reducing the risk of malfunction, improving equipment safety, and extending the propeller's service life.

[0074] In some embodiments of the present application, an oil seal 13 and a sealing ring 10 are further included. The oil seal 13 covers the side of the bearing 14 facing the hydraulic motor 1 , and the sealing ring 10 covers the side of the bearing facing the ball head 12 .

[0075] The oil seal 13 is installed on the side of the bearing 14 away from the ball head 12 . Its function is to prevent the lubricating oil from leaking out of the bearing 14 and to prevent external water or impurities from entering the bearing 14 .

[0076] The sealing ring 10 is located on the side of the bearing 14 facing the ball head 12. Its function is to ensure the seal between the bearing 14 and the ball head 12 and prevent water from entering the key components inside the propeller.

[0077] When the hydraulic motor 1 drives the intermediate shaft 2 and the impeller 3 to rotate, the oil seal 13 and the sealing ring 10 work together to protect the moving parts such as the bearing 14 and the ball head 12, thereby ensuring the normal operation and long-term stability of the propeller.

[0078] Oil seal 13 effectively prevents lubricating oil leakage from bearing 14, maintaining the effectiveness of the lubrication system while avoiding contamination of the aquatic environment. Sealing ring 10 prevents water from entering the space between ball head 12 and bearing 14, protecting internal mechanical components from water damage and enhancing the thruster's waterproof performance. By preventing lubricating oil leakage and water ingress, oil seal 13 and sealing ring 10 help extend the service life of bearing 14 and other moving parts. The use of oil seal 13 and sealing ring 10 improves the overall reliability of the thruster and reduces failures caused by poor sealing.

[0079] This embodiment also includes a shaft support 15. The guide cover 5, the guide vane 4, and the shaft support 15 are an integral unit and are coaxially connected to the intermediate connector 6 by bolts. During operation, only the hydraulic motor 1 drives the intermediate shaft 2 and the impeller 3 to rotate.

[0080] The bearing 14 is installed on the side of the shaft support 15 away from the hydraulic motor 1 and is used to support the intermediate shaft 2. The side of the bearing 14 facing the hydraulic motor 1 is sealed by the oil seal 13 (installed on the inner circle of the shaft support 15 facing the hydraulic motor 1), and the side away from the hydraulic motor 1 is sealed by the ball head 12 pressing the sealing ring 10 on the shaft support 15 to prevent water from entering the interior of the bearing 14.

[0081] The underwater propulsion device of this embodiment includes an intermediate connector 6 and a shroud 5 connected by bolts. A hydraulic motor 1 is mounted on a mounting plate 7 at the other end of the intermediate connector 6. The shaft end of the hydraulic motor 1 is connected to the intermediate shaft 2 via a sleeve 8. The impeller 3 engages with the intermediate shaft 2 via a flat key 9 and is fixed to the intermediate shaft 2 via a nut 11. The front end of the intermediate shaft 2 is mounted on the inner diameter of a bearing 14 within the shroud 5. One end of the bearing 14 is sealed by an oil seal 13 mounted on one side of the shroud 5, and the other end, a ball head 12, is mounted on the shroud 5 via a sealing ring 10 for sealing. A guide vane 4 is provided at the front end of the shroud 5. When the hydraulic motor 1 drives the impeller 3 to rotate via the sleeve 8, the impeller 3 draws water from the center and sprays it out through the shroud 5, generating a certain amount of thrust to propel the hull forward.

[0082] The underwater propulsion device of this embodiment is composed of an intermediate connector 6, a deflector 5, a hydraulic motor 1, a mounting plate 7, a sleeve 8, an intermediate shaft 2, an impeller 3, a flat key 9, a nut 11, a bearing 14, an oil seal 13, a ball head 12, a sealing ring 10 and a guide vane 4.

[0083] The intermediate connector 6 and the shroud 5 are connected by bolts, and the hydraulic motor 1 is mounted on a mounting plate 7 at the other end of the intermediate connector 6. The output shaft of the hydraulic motor 1 is connected to the intermediate shaft 2 via a sleeve 8. The impeller 3 engages with the intermediate shaft 2 via a flat key 9 and is fixed to the intermediate shaft 2 via a nut 11.

[0084] The front end of the intermediate shaft 2 is installed on the inner diameter of the bearing 14 in the air deflector 5. One end of the bearing 14 is installed on one side of the air deflector 5 through an oil seal 13 for sealing. The ball head 12 on the other side is installed in the air deflector 5 through a sealing ring 10 to ensure sealing.

[0085] When the hydraulic motor 1 is started, the intermediate shaft 2 and the impeller 3 are driven to rotate through the shaft sleeve 8. After the impeller 3 sucks in water, it accelerates the water and throws it toward the inner wall of the fairing 5. The water is then ejected from the front end of the fairing 5 along the guide vane 4, forming thrust to push the hull forward.

[0086] Compared with the existing technology, the technical solution provided by this application brings the following beneficial technical effects:

[0087] The present application arranges a guide vane 4 and a guide cover 5 at the tail of the impeller 3. When the hydraulic motor 1 drives the impeller 3 to rotate through the intermediate shaft 2, the water flow sucked from the head of the impeller 3 passes through the gap between the blades of the impeller 3, is accelerated by the centrifugal force, and is thrown onto the inner wall of the guide cover 5. It is then ejected from the tail of the guide cover 5 along the guide vane 4, forming a certain thrust, pushing the hull forward, and improving the propulsion efficiency.

[0088] Those skilled in the art will understand that the various operations, methods, steps, measures, and schemes in the processes discussed in this application may be alternated, changed, rearranged, decomposed, combined, or deleted.

[0089] The specific implementation methods of the present application described above do not limit the scope of protection of the present application. Any other corresponding changes and modifications made based on the technical concept of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. An underwater propulsion device, characterized in that: include: Hydraulic motor; an intermediate shaft, the intermediate shaft being transmission-connected to an output end of the hydraulic motor; an impeller, the impeller being sleeved on the periphery of the intermediate shaft and being in driving connection with the intermediate shaft; a guide vane, the guide vane being coaxially arranged with the impeller and located on a side of the impeller away from the hydraulic motor; A deflector cover is sleeved on the periphery of the deflector plate and is respectively connected to the hydraulic motor and the intermediate shaft.

2. An underwater propulsion device according to claim 1, characterized in that: It also includes an intermediate connector and a mounting plate, one end of the intermediate connector is connected to the air deflector bolt, the other end of the intermediate connector is connected to the mounting plate, and the mounting plate is connected to the hydraulic motor.

3. An underwater propulsion device according to claim 2, characterized in that: The mounting plate is annularly sleeved around the outer periphery of the output shaft of the hydraulic motor.

4. An underwater propulsion device according to claim 3, characterized in that: The intermediate connector includes a shell and a plurality of connecting columns. The shell is annularly sleeved on the periphery of the impeller. Both ends of each connecting column are respectively connected to the outer surface of the mounting plate and the outer surface of the shell.

5. The underwater propulsion device according to claim 1, characterized in that: It also includes a shaft sleeve, which is coaxially arranged with the output shaft of the hydraulic motor and the intermediate shaft, and two ends of the shaft sleeve are respectively connected with the output shaft of the hydraulic motor and the intermediate shaft by keys.

6. The underwater propulsion device according to claim 1, characterized in that: The inner surface of the impeller is provided with a protruding flat key, the outer surface of the intermediate shaft is provided with a recessed keyway, and the impeller and the intermediate shaft are connected via the flat key and the keyway.

7. The underwater propulsion device according to claim 6, characterized in that: It also includes a nut, through which the intermediate shaft is connected to the impeller, and an extending direction of the nut is parallel to an axial direction of the intermediate shaft.

8. The underwater propulsion device according to claim 1, characterized in that: It also includes a bearing, which is sleeved on the end of the intermediate shaft facing the air deflector.

9. The underwater propulsion device according to claim 8, characterized in that: It also includes a ball head, which is located on the inner side of the deflector and covers the axis of the deflector.

10. The underwater propulsion device according to claim 9, characterized in that: It also includes an oil seal and a sealing ring. The oil seal covers the side of the bearing facing the hydraulic motor, and the sealing ring covers the side of the bearing facing the ball head.

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