An underwater propulsion device

Abstract

The application provides an underwater propulsion device, comprising: a ring-shaped fairing and a ring-shaped casing connected with each other, and a power assembly arranged in the ring-shaped casing; a blade assembly, which is in transmission connection with the power assembly; and a propeller guide pipe, which is arranged at one end of the ring-shaped casing away from the ring-shaped fairing and at least partially sleeved on the outside of the ring-shaped casing; wherein the power assembly is internally formed with a first channel for fluid circulation, and the propeller guide pipe and the ring-shaped casing are formed with a second channel for fluid circulation; and the application solves the technical problem that the blades of the existing underwater propulsion device often increase the overall motor size to meet the performance requirements when facing large power demand, thereby increasing the occupied space of the device and further increasing the manufacturing cost of the underwater propulsion device.

Description

Technical Field

[0001] This invention relates to the field of underwater propulsion, and more specifically, to an underwater propulsion device. Background Technology

[0002] The underwater electric propulsion device is a highly integrated propulsion device. Its core lies in eliminating the shaft transmission system in traditional propulsion methods, realizing the integrated design of the motor and propeller. This makes the overall structure of the propulsion device simple and compact, small in size, and flexible in installation, adaptable to various underwater operation scenarios.

[0003] Currently, the blades of mainstream underwater propulsion devices are mainly divided into two categories: one is the traditional structure, which forms a propulsion unit by arranging blades on the outside of the rotating shaft; the other is the rim propulsion device, which uses the hollow structure of the inner rotor to set the blades on the inside of the rotor, forming a unique internal rotation propulsion structure.

[0004] However, there is at least one problem with the relevant technology: when faced with high power demand, the blades of existing underwater propulsion devices often meet the performance requirements by increasing the overall size of the motor, which leads to an increase in the space occupied by the device and thus increases the manufacturing cost of the underwater propulsion device. Summary of the Invention

[0005] The technical problem solved by this invention is that when the blades of existing underwater propulsion devices face high power demands, they often increase the overall size of the motor to meet performance requirements, which leads to an increase in the space occupied by the device and thus increases the manufacturing cost of the underwater propulsion device.

[0006] To solve the above-mentioned technical problems, the present invention discloses an underwater propulsion device, which includes an annular fairing and an annular housing connected to each other, and a power component disposed within the annular housing.

[0007] The blade assembly is connected to the power assembly via a transmission.

[0008] The thruster duct is located at one end of the annular housing away from the annular fairing, and the thruster duct is at least partially fitted over the outside of the annular housing.

[0009] The power assembly has a first channel for fluid flow, and the propeller duct and the annular casing have a second channel for fluid flow.

[0010] Compared with existing technologies, the technical effects achieved by this solution are as follows: This solution forms a dual-fluid flow path by using a first channel formed inside the power assembly and a second channel formed between the thruster duct and the annular casing. Combined with the modular connection between the annular fairing and the annular casing, and the transmission coordination between the power assembly and the propeller assembly, it solves the problem of increased space occupation caused by the need to increase the size of the motor when meeting high power requirements in existing underwater propulsion devices. This reduces the manufacturing cost of underwater propulsion devices and also significantly improves the propulsion power output and performance stability without increasing the overall volume of the underwater propulsion device.

[0011] In one embodiment of the present invention, the blade assembly is mounted on the end of the annular housing facing away from the annular fairing, and the blade assembly includes:

[0012] The propeller hub is connected to the propeller blade assembly via a drive mechanism.

[0013] Multiple inner blades are spaced apart on the inner circumferential side of the propeller hub and integrally formed with the propeller hub.

[0014] Multiple outer blades are spaced apart on the outer circumferential side of the propeller hub and integrally formed with the propeller hub;

[0015] Among them, multiple inner blades are located in the first channel, and multiple outer blades are located in the second channel.

[0016] Compared with existing technologies, the technical effects achieved by this solution are as follows: The propeller assembly in this solution is designed with a hub and multiple integrally formed inner and outer blades. The inner blades are arranged corresponding to the first channel, and the outer blades to the second channel. Through the cooperation of the inner blades with the first channel and the outer blades with the second channel, synchronous flow diversion and guidance of the fluid are achieved, thereby improving the propulsion power output efficiency and stability of the underwater propulsion device. Furthermore, the multiple outer blades are spaced apart on the outer circumferential side of the hub and integrally formed with the hub, achieving a hub-less and shaftless design for the inner flow channel. This reduces fluid disturbance and blade running resistance, thereby lowering the vibration and noise of the underwater propulsion device.

[0017] In one embodiment of the present invention, the underwater propulsion device further includes a first inlet and a first outlet located at both ends of the first channel, and a second inlet located outside the annular housing and communicating with the second channel;

[0018] The second entrance is located between the first entrance and the first exit.

[0019] Compared with existing technologies, the technical effects achieved by this solution are as follows: This solution sets a first inlet and a first outlet at both ends of the first channel, and places the second inlet of the second channel between the first inlet and the first outlet, thus forming a structural design of "first inlet forward, second inlet backward". On the one hand, by utilizing the pre-suction characteristics of the first channel, debris is sucked into the first channel in advance, avoiding the situation where debris enters the second channel and becomes entangled with the outer blades, thereby reducing the failure risk of the underwater propulsion device and improving operational safety. On the other hand, by staggering the flow of fluid through the two channels, mutual interference between the fluids flowing through the first and second channels is avoided, improving fluid drive efficiency and propulsion power output stability.

[0020] In one embodiment of the present invention, the underwater propulsion device further includes:

[0021] Multiple first stator blades are spaced apart in the second channel, and one end of each first stator blade is fixedly connected to the outer circumferential side of the annular housing, while the other end is fixedly connected to the inner wall of the propeller duct.

[0022] Among them, multiple outer blades are located on the side of multiple first stator blades that are away from the second inlet.

[0023] Compared with existing technologies, the technical effects achieved by this solution are as follows: This solution arranges multiple first stator blades at intervals in the second channel, with one end of each first stator blade fixedly connected to the outer circumferential side of the annular housing and the other end fixedly connected to the inner wall of the thruster duct. The outer blades are arranged on the side of the first stator blades away from the second inlet. The first stator blades play a role in pre-guiding and stabilizing the fluid in the second channel, thereby avoiding the problem of disordered fluid flow and large disturbance in the second channel, which affects the propulsion efficiency and stability. This improves the propulsion efficiency of the fluid and further enhances the power output stability of the underwater propulsion device.

[0024] In one embodiment of the present invention, a first inlet is formed inside the annular fairing, and a guide slope is provided on the side of the annular fairing away from the annular housing. The guide slope is gradually contracted towards the central axis of the annular fairing in the direction away from the annular housing.

[0025] Compared with the existing technology, the technical effects achieved by adopting this technical solution are as follows: This solution forms the first inlet inside the annular rectifier and sets a guide slope on the side of the annular rectifier away from the annular housing. The guide slope plays a role in rectifying and guiding the fluid, thereby reducing the inlet resistance and impact loss of the fluid and improving the fluid velocity and flow uniformity in the first channel.

[0026] In one embodiment of the present invention, the power assembly includes:

[0027] The motor stator is fixed inside the annular housing.

[0028] The motor rotor is rotatably assembled inside the annular housing and is rotatably connected to the motor stator via bearings.

[0029] The propeller hub rotates synchronously with the motor rotor, and the power of the motor rotor is transmitted to the propeller hub through a linkage structure to drive the propeller hub to rotate.

[0030] Compared with existing technologies, the technical effects achieved by this solution are as follows: The power assembly in this solution includes a motor stator and a motor rotor fixed within a ring-shaped housing. The motor stator and rotor are rotatably connected by bearings, and a linkage structure transmits power from the motor rotor to the propeller hub, driving the hub to rotate synchronously. On one hand, this achieves a compact integration of the overall underwater propulsion device structure, ensuring power transmission efficiency without increasing the overall space required. On the other hand, the bearing connection between the motor stator and rotor reduces rotational friction loss and vibration, further enhancing the device's operational stability and power transmission efficiency, thereby reducing the later maintenance costs of core components.

[0031] In one embodiment of the present invention, the propeller hub includes a first propeller hub and a second propeller hub arranged coaxially, a plurality of outer blades are spaced apart on the outer circumferential side of the first propeller hub, and a plurality of inner blades are spaced apart on the inner side of the second propeller hub.

[0032] The motor rotor includes a first rotor and a second rotor with a matching structure. The first rotor is embedded in the axial gap between the first hub and the second hub, and the second rotor is located between the second hub and the annular fairing.

[0033] The second rotor hub is fitted inside the motor stator, which is located between the first rotor and the second rotor. The linkage structure includes a first connecting part and a second connecting part integrally formed on both sides of the first rotor, and a third connecting part integrally formed with the second rotor. The first connecting part is fixedly connected to the end of the first rotor hub near the second rotor hub, the second connecting part is connected to the end of the second rotor hub near the first rotor hub, and the third connecting part is fixedly connected to the end of the second rotor hub near the annular fairing.

[0034] Compared with existing technologies, the technical effects achieved by this solution are as follows: The propeller hub in this solution includes a first propeller hub and a second propeller hub arranged coaxially, with multiple outer blades spaced apart on the outer circumferential side of the first propeller hub and multiple inner blades spaced apart on the inner side of the second propeller hub. The motor rotor includes a first rotor and a second rotor, with the motor stator positioned between the first rotor and the second rotor. This improves the internal space utilization of the underwater propulsion device, making the overall structure more compact. It avoids the volume redundancy problem caused by relying on increasing the size of the motor to meet the high power demand in existing technologies. Without increasing the space occupied by the device, it further ensures the power transmission efficiency and the operational stability of the device.

[0035] In one embodiment of the present invention, a first protrusion is provided at one end of the second propeller hub near the first propeller hub, and a second protrusion is provided at one end of the second propeller hub near the annular fairing.

[0036] The second connecting part is provided with a first receiving groove that is adapted to the first protrusion, and the third connecting part is provided with a second receiving groove that is adapted to the second protrusion.

[0037] When the second rotor hub is assembled between the first rotor and the second rotor, the first protrusion and the first receiving groove form a fitting engagement, and the second protrusion and the second receiving groove form a fitting engagement.

[0038] Compared with existing technologies, the technical effects achieved by this solution are as follows: By providing a first protrusion and a second protrusion at both ends of the second rotor hub, and correspondingly opening a first receiving groove and a second receiving groove at the second and third connecting parts of the motor rotor, the second rotor hub is fitted with the first rotor and the second rotor to form a fitting fit. This achieves precise coaxial positioning and firm connection between the second rotor hub and the motor rotor. The fitting structure improves the stability and torsional resistance of the transmission connection, reduces energy loss and vibration deviation during power transmission, and thus extends the service life of the underwater propulsion device.

[0039] In one embodiment of the present invention, the motor rotor is fitted inside the motor stator;

[0040] The linkage structure includes an annular output shaft located on the side of the motor rotor away from the motor stator. One end of the annular output shaft is fixedly connected to the propeller hub, and the other end is rotatably connected to the annular fairing.

[0041] Compared with existing technologies, the technical effects achieved by this solution are as follows: This solution integrates the motor rotor inside the motor stator and uses an annular output shaft as the linkage structure. One end of the annular output shaft is fixedly connected to the propeller hub, and the other end is rotatably connected to the annular fairing. This achieves a compact integrated design of the power assembly and the propeller assembly. The support at both ends of the annular output shaft improves the transmission rigidity and coaxiality, reduces energy loss and vibration during power transmission, and further enhances the stability of propulsion power output.

[0042] In one embodiment of the present invention, the underwater propulsion device further includes:

[0043] Multiple second stator blades are fixedly installed circumferentially inside the propeller duct and located on the side of the blade assembly away from the annular housing.

[0044] Each of the second stator blades extends toward the central axis of the propeller duct, and the ends of multiple second stator blades away from the inner wall of the propeller duct are fixedly connected by connectors.

[0045] Compared with existing technologies, the technical effects achieved by this solution are as follows: By setting a second stator blade inside the propeller duct, with the second stator blade located on the side of the propeller assembly away from the annular casing, and multiple second stator blades fixedly connected at the ends away from the inner wall of the propeller duct via connectors, the second stator blades provide secondary flow stabilization and rectification for the fluid discharged from the dual channels, offsetting the rotational kinetic energy of the fluid and thus improving the propulsion efficiency. Furthermore, the multiple second stator blades fixed by connectors reduce vibration and deformation of the propeller duct under high-speed fluid impact, enhance the rigidity of the second stator blades, and thereby improve the structural stability of the propeller duct.

[0046] By adopting the technical solution of the present invention, the following technical effects can be achieved:

[0047] (1) The underwater propulsion device disclosed in this invention forms a dual fluid flow path through a first channel formed inside the power component and a second channel formed between the thruster duct and the annular housing. Combined with the modular connection of the annular fairing and the annular housing, and the transmission cooperation between the power component and the blade component, it solves the problem of increased space occupation caused by the need to increase the size of the motor when the existing underwater propulsion device needs to meet the high power demand, thereby reducing the manufacturing cost of the underwater propulsion device. At the same time, it also achieves a significant improvement in propulsion power output and performance stability without increasing the overall volume of the underwater propulsion device.

[0048] (2) In this invention, the propeller assembly of an underwater propulsion device is configured as a structure including a hub and multiple inner blades and multiple outer blades integrally formed, with the inner blades corresponding to the first channel and the outer blades corresponding to the second channel respectively. By cooperating with the first channel and the second channel, the multiple inner blades achieve synchronous flow splitting and guiding of the fluid, thereby improving the propulsion power output efficiency and output stability of the underwater propulsion device. Furthermore, the multiple outer blades are spaced apart on the outer circumferential side of the hub and integrally formed with the hub, realizing a hub-less and shaftless design of the inner flow channel, reducing fluid disturbance and blade running resistance, thereby reducing the vibration and noise of the underwater propulsion device. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 One of the perspective views of an underwater propulsion device provided in some embodiments of the present invention;

[0051] Figure 2 This is one of the partial view structural schematic diagrams of an underwater propulsion device provided in some embodiments of the present invention;

[0052] Figure 3 for Figure 2 Sectional view along AA;

[0053] Figure 4 A second perspective view of an underwater propulsion device provided in some embodiments of the present invention;

[0054] Figure 5 A third perspective view of an underwater propulsion device provided in some embodiments of the present invention;

[0055] Figure 6 This is a second partial view structural schematic diagram of an underwater propulsion device provided in some embodiments of the present invention;

[0056] Figure 7 for Figure 6 Sectional view along BB;

[0057] Figure 8 for Figure 7 A magnified view of region A in the middle;

[0058] Figure 9 for Figure 7 Exploded view of the middle structural components.

[0059] Explanation of reference numerals in the attached figures:

[0060] 100, Annular fairing; 110, Guide slope; 200, Annular housing; 300, Power assembly; 310, First channel; 311, First inlet; 320, Motor stator; 330, Motor rotor; 331, First rotor; 331a, First receiving groove; 331b, First connecting part; 332, Second rotor; 332a, Second receiving groove; 340, Annular output shaft; 400, Blade assembly; 410, Blade hub; 411, First blade hub; 411a, Protrusion; 412, Second blade hub; 412a, First protrusion; 412b, Second protrusion; 420, Inner blade; 430, Outer blade; 500, Propeller duct; 510, Second inlet; 520, First stator blade; 530, Second stator blade; 540, Connector; 600, Bearing. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments described in this application, all other embodiments obtained by those skilled in the art without creative effort will fall within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "having," "having," "equipped with," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "having," "having," or "equipped with" indicates, for example, a device having one or more elements, but not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0063] As mentioned above, it should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, or component, but does not exclude the presence or addition of one or more other features, integers, parts, or groups of features, integers, or parts. As used in this application, the singular forms "a," "an," and "the" also include the plural forms, unless the context clearly indicates otherwise.

[0064] like Figures 1 to 9 As shown, this invention discloses an underwater propulsion device, which includes an annular fairing 100 and an annular housing 200, a thruster duct 500, and a power assembly 300 and a blade assembly 400 disposed within the annular housing 200. Specifically, the blade assembly 400 is drive-connected to the power assembly 300, and the thruster duct 500 is disposed at one end of the annular housing 200 away from the annular fairing 100, and at least partially sleeved on the outside of the annular housing 200; wherein, a first channel 310 for fluid flow is formed inside the power assembly 300, and a second channel for fluid flow is formed between the thruster duct 500 and the annular housing 200.

[0065] Understandably, this solution constructs a dual-fluid flow path through the first channel 310 formed inside the power assembly 300 and the second channel formed between the thruster duct 500 and the annular housing 200. Combined with the modular connection between the annular fairing 100 and the annular housing 200, and the transmission cooperation between the power assembly 300 and the propeller assembly 400, it solves the problem of increased space occupation caused by the need to increase the size of the motor when meeting high power requirements in existing underwater propulsion devices. This reduces the manufacturing cost of the underwater propulsion device and also significantly improves the propulsion power output and performance stability without increasing the overall volume of the underwater propulsion device.

[0066] like Figures 1 to 3 As shown, in some embodiments of the present invention, the blade assembly 400 is mounted on one end of the annular housing 200 away from the annular fairing 100. The blade assembly 400 includes a hub 410, a plurality of inner blades 420, and a plurality of outer blades 430. Specifically, the hub 410 is drive-connected to the blade assembly 400. The plurality of inner blades 420 are spaced apart on the inner circumferential side of the hub 410 and integrally formed with the hub 410. The plurality of outer blades 430 are spaced apart on the outer circumferential side of the hub 410 and integrally formed with the hub 410. The plurality of inner blades 420 are located in the first channel 310, and the plurality of outer blades 430 are located in the second channel.

[0067] Understandably, in this design, the propeller assembly 400 is configured as a structure including a hub 410 and multiple integrally formed inner blades 420 and outer blades 430. The inner blades 420 are arranged corresponding to the first channel 310, and the outer blades 430 are arranged corresponding to the second channel. Through the cooperation of the inner blades 420 with the first channel 310 and the outer blades 430 with the second channel, synchronous flow diversion and guidance of the fluid are achieved, thereby improving the propulsion power output efficiency and stability of the underwater propulsion device. Furthermore, the multiple outer blades 430 are spaced apart on the outer circumferential side of the hub 410 and integrally formed with the hub 410, achieving a hubless and shaftless design for the inner flow channel. This reduces fluid disturbance and blade running resistance, thereby reducing the vibration and noise of the underwater propulsion device.

[0068] like Figures 1 to 4 As shown, in some embodiments of the present invention, the underwater propulsion device further includes a first inlet 311 and a first outlet located at both ends of the first channel 310, and a second inlet 510 located outside the annular housing 200 and communicating with the second channel; wherein the second inlet 510 is located between the first inlet 311 and the first outlet.

[0069] Understandably, this design, by setting a first inlet 311 and a first outlet at both ends of the first channel 310, and placing the second inlet 510 of the second channel between the first inlet 311 and the first outlet, forms a structural design with "first inlet 311 forward and second inlet 510 backward." On the one hand, utilizing the forward suction characteristic of the first channel 310, debris is sucked into the first channel 310 in advance, preventing debris from entering the second channel and becoming entangled with the outer blades 430, thereby reducing the risk of underwater propulsion device failure and improving operational safety. On the other hand, by staggering the flow of fluid through the two channels, mutual interference between the fluids flowing through the first channel 310 and the second channel is avoided, improving fluid drive efficiency and propulsion power output stability.

[0070] like Figures 1 to 5 As shown, in some embodiments of the present invention, the underwater propulsion device further includes a plurality of first stator blades 520, which are spaced apart in the second channel. One end of each of the first stator blades 520 is circumferentially fixedly connected to the outer side of the annular housing 200, and the other end is fixedly connected to the inner wall of the thruster duct 500. Among them, a plurality of outer blades 430 are located on the side of the plurality of first stator blades 520 away from the second inlet 510.

[0071] Understandably, this solution involves arranging multiple first stator blades 520 at intervals within the second channel. One end of each first stator blade 520 is circumferentially fixed to the outer side of the annular housing 200, and the other end is fixedly connected to the inner wall of the thruster duct 500. The outer blades 430 are arranged on the side of the first stator blades 520 facing away from the second inlet 510. The first stator blades 520 play a role in pre-guiding and stabilizing the flow of fluid in the second channel, thereby avoiding the problem of disordered fluid flow and large disturbance in the second channel, which affects the propulsion efficiency and stability. This improves the propulsion efficiency of the fluid and further enhances the power output stability of the underwater propulsion device.

[0072] like Figure 4 As shown, in some embodiments of the present invention, the first inlet 311 is formed inside the annular fairing 100, and the annular fairing 100 is provided with a flow guiding slope 110 on the side away from the annular housing 200. The flow guiding slope 110 is gradually contracted towards the central axis of the annular fairing 100 along the direction away from the annular housing 200.

[0073] It is understandable that this solution forms the first inlet 311 inside the annular shroud 100 and sets a guide slope 110 on the side of the annular shroud 100 away from the annular housing 200. The guide slope 110 plays the role of rectifying and guiding the fluid, thereby reducing the inlet resistance and impact loss of the fluid and improving the fluid velocity and flow uniformity in the first channel 310.

[0074] like Figures 2 to 9 As shown, in some embodiments of the present invention, the power assembly 300 includes a motor stator 320 and a motor rotor 330. Specifically, the motor stator 320 is fixed inside the annular housing 200, and the motor rotor 330 is rotatably mounted inside the annular housing 200 and rotatably connected to the motor stator 320 via a bearing 600; wherein, the propeller hub 410 rotates synchronously with the motor rotor 330, and the power of the motor rotor 330 is transmitted to the propeller hub 410 through a linkage structure to drive the propeller hub 410 to rotate.

[0075] Understandably, in this design, the power assembly 300 includes a motor stator 320 and a motor rotor 330 fixed within the annular housing 200. The motor stator 320 and motor rotor 330 are rotatably connected by bearings 600. Simultaneously, a linkage structure enables the motor rotor 330 to transmit power to the propeller hub 410, driving the hub to rotate synchronously. On one hand, this achieves a compact integration of the underwater propulsion device's overall structure, ensuring power transmission efficiency without increasing the overall space required. On the other hand, the bearing connection between the motor stator 320 and motor rotor 330 reduces rotational friction loss and vibration, further enhancing the device's operational stability and power transmission efficiency, thereby reducing the later maintenance costs of core components.

[0076] like Figures 6 to 9 As shown, in some embodiments of the present invention, the propeller hub 410 includes a first propeller hub 411 and a second propeller hub 412 arranged coaxially. A plurality of outer blades 430 are spaced apart on the outer circumferential side of the first propeller hub 411, and a plurality of inner blades 420 are spaced apart on the inner side of the second propeller hub 412. The motor rotor 330 includes a first rotor 331 and a second rotor 332 with adapted structures. The first rotor 331 is embedded in the axial gap between the first propeller hub 411 and the second propeller hub 412, and the second rotor 332 is located between the second propeller hub 412 and the annular fairing 100. The second propeller hub 41... Two components are installed inside the motor stator 320, which is located between the first rotor 331 and the second rotor 332. The linkage structure includes a first connecting part 331b and a second connecting part integrally formed on both sides of the first rotor 331, and a third connecting part integrally formed with the second rotor 332. The first connecting part 331b is fixedly connected to the end of the first rotor hub 411 near the second rotor hub 412, the second connecting part is connected to the end of the second rotor hub 412 near the first rotor hub 411, and the third connecting part is fixedly connected to the end of the second rotor hub 412 near the annular fairing 100.

[0077] It is understood that in this solution, the propeller hub 410 includes a first propeller hub 411 and a second propeller hub 412 arranged coaxially, and multiple outer blades 430 are spaced apart on the outer circumferential side of the first propeller hub 411, and multiple inner blades 420 are spaced apart on the inner side of the second propeller hub 412. The motor rotor 330 includes a first rotor 331 and a second rotor 332, and the motor stator 320 is arranged between the first rotor 331 and the second rotor 332. This improves the internal space utilization of the underwater propulsion device, makes the overall structure more compact, and avoids the volume redundancy problem caused by relying on increasing the size of the motor to meet the large power demand in the prior art. Without increasing the space occupied by the device, it further ensures the power transmission efficiency and the stability of the device operation.

[0078] It is worth mentioning that, such as Figures 6 to 9 As shown, in order to further enhance the connection strength and transmission reliability between the first rotor hub 411 and the first rotor 331, the first rotor hub 411 extends to the side facing the first rotor 331 to form a protrusion 411a. The protrusion 411a and the first connecting part 331b of the first rotor 331 are fastened together by screws, thereby avoiding the problems of energy loss and increased vibration caused by loose connection during power transmission, and further improving the assembly stability of the first rotor hub 411 and the first rotor 331.

[0079] like Figures 6 to 9As shown, in some embodiments of the present invention, a first protrusion 412a is provided at one end of the second rotor hub 412 near the first rotor hub 411, and a second protrusion 412b is provided at one end of the second rotor hub 412 near the annular fairing 100; a first receiving groove 331a adapted to the first protrusion 412a is provided at the second connecting portion, and a second receiving groove 332a adapted to the second protrusion 412b is provided at the third connecting portion; wherein, when the second rotor hub 412 is assembled between the first rotor 331 and the second rotor 332, the first protrusion 412a and the first receiving groove 331a form a fitting engagement, and the second protrusion 412b and the second receiving groove 332a form a fitting engagement.

[0080] Understandably, this solution provides a first protrusion 412a and a second protrusion 412b at both ends of the second rotor hub 412, and correspondingly provides a first receiving groove 331a and a second receiving groove 332a at the second and third connecting parts of the motor rotor 330, respectively. This allows the second rotor hub 412 to form a fitting fit when assembled between the first rotor 331 and the second rotor 332, achieving precise coaxial positioning and a firm connection between the second rotor hub 412 and the motor rotor 330. The fitting structure improves the stability and torsional resistance of the transmission connection, reduces energy loss and vibration deviation during power transmission, and thus extends the service life of the underwater propulsion device.

[0081] It is worth mentioning that, in order to further enhance the robustness of the connection between the second rotor hub 412 and the first rotor 331 and the second rotor 332, on the basis of the engagement between the first protrusion 412a and the second connecting part and the engagement between the second protrusion 412b and the third connecting part, screws are used to tighten and lock the engagement parts of the first protrusion 412a and the second connecting part and the engagement parts of the second protrusion 412b and the third connecting part, respectively. The mechanical tightening effect of the screws strengthens the connection rigidity, avoids loosening of the connection or relative displacement caused by vibration and load fluctuation during power transmission, reduces energy loss and component wear, and further improves the overall operational stability of the underwater propulsion device.

[0082] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the motor rotor 330 is sleeved inside the motor stator 320; the linkage structure includes an annular output shaft 340 disposed on the side of the motor rotor 330 away from the motor stator 320, one end of the annular output shaft 340 is fixedly connected to the propeller hub 410, and the other end is rotatably connected to the annular fairing 100.

[0083] Understandably, this solution achieves a compact integrated design of the power assembly 300 and the blade assembly 400 by fitting the motor rotor 330 inside the motor stator 320 and using an annular output shaft 340 as a linkage structure. One end of the annular output shaft 340 is fixedly connected to the blade hub 410, and the other end is rotatably connected to the annular fairing 100. The support at both ends of the annular output shaft 340 enhances the transmission rigidity and coaxiality, reduces energy loss and vibration during power transmission, and further strengthens the stability of propulsion power output.

[0084] like Figure 1 and Figure 5 As shown, in some embodiments of the present invention, the underwater propulsion device further includes a plurality of second stator blades 530, which are circumferentially spaced and fixed inside the thruster duct 500 and located on the side of the blade assembly 400 opposite to the annular housing 200. Each second stator blade 530 extends toward the central axis of the thruster duct 500, and one end of each second stator blade 530 away from the inner wall of the thruster duct 500 is fixedly connected by a connector 540. Preferably, the connector 540 is a gear-shaped clip or an annular structure.

[0085] Understandably, this solution incorporates second stator blades 530 inside the propeller duct 500. These second stator blades 530 are located on the side of the propeller assembly 400 opposite to the annular housing 200, and the ends of multiple second stator blades 530 away from the inner wall of the propeller duct 500 are fixedly connected by connectors 540. On one hand, the second stator blades 530 provide secondary flow stabilization and rectification for the dual-channel discharged fluid, counteracting the fluid's rotational kinetic energy and thus improving the fluid's propulsion efficiency. On the other hand, the fixing of multiple second stator blades 530 by connectors 540 reduces vibration and deformation of the propeller duct 500 under high-speed fluid impact, enhances the rigidity of the second stator blades 530, and thus improves the structural stability of the propeller duct 500.

[0086] like Figure 1 As shown, in some embodiments of the present invention, a plurality of second stator blades 530 extend radially toward the central axis of the propeller duct 500, and one end of each second stator blade 530 away from the inner wall of the propeller duct 500 is fixedly connected by a connector 540, which is a gear-shaped clamp, thereby forming a plurality of independent fan-shaped flow channels to achieve precise diversion and stabilization of the discharged fluid.

[0087] like Figure 5As shown, in another embodiment of the present invention, a plurality of second stator blades 530 extend radially toward the central axis of the propeller duct 500, and the ends of each second stator blade 530 are fixedly connected by a connector 540, wherein the connector 540 is an annular structure; the annular structure divides the outlet end of the propeller duct 500 into inner and outer flow channels, wherein a central flow channel connected to the first channel 310 is formed inside the annular structure, and a plurality of fan-shaped flow channels connected to the second channel are formed outside the annular structure, thereby realizing independent discharge and coordinated rectification of fluid in the two channels, and further optimizing fluid propulsion efficiency.

[0088] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An underwater propulsion device, characterized in that, The underwater propulsion device includes an annular fairing (100) and an annular housing (200) connected to each other, and a power unit (300) disposed within the annular housing (200). A blade assembly (400) is connected to the power assembly (300) in a transmission manner; A thruster duct (500) is disposed at one end of the annular housing (200) away from the annular fairing (100), and the thruster duct (500) is at least partially sleeved on the outside of the annular housing (200); The power assembly (300) has a first channel (310) for fluid flow inside, and a second channel for fluid flow is formed between the thruster conduit (500) and the annular housing (200). The blade assembly (400) includes: Propeller hub (410); Multiple inner blades (420) are spaced apart on the inner circumferential side of the hub (410); Multiple outer blades (430) are spaced apart on the outer circumferential side of the propeller hub (410); The plurality of inner blades (420) are located in the first channel (310), and the plurality of outer blades (430) are located in the second channel.

2. The underwater propulsion device according to claim 1, characterized in that, The blade assembly (400) is mounted on one end of the annular housing (200) away from the annular fairing (100); The plurality of inner blades (420) are integrally formed with the hub (410); The plurality of outer blades (430) are integrally formed with the hub (410).

3. The underwater propulsion device according to claim 2, characterized in that, The underwater propulsion device also includes a first inlet (311) and a first outlet located at both ends of the first channel (310), and a second inlet (510) located outside the annular housing (200) and communicating with the second channel. The second inlet (510) is located between the first inlet (311) and the first outlet.

4. The underwater propulsion device according to claim 3, characterized in that, The underwater propulsion device also includes: Multiple first stator blades (520) are spaced apart in the second channel, and one end of each first stator blade (520) is fixedly connected to the outer circumferential side of the annular housing (200), and the other end is fixedly connected to the inner wall of the thruster duct (500). The plurality of outer blades (430) are located on the side of the plurality of first stator blades (520) away from the second inlet (510).

5. The underwater propulsion device according to claim 3, characterized in that, The first inlet (311) is formed inside the annular fairing (100), and the annular fairing (100) is provided with a flow guide slope (110) on the side away from the annular housing (200). The flow guide slope (110) is gradually contracted towards the central axis of the annular fairing (100) in the direction away from the annular housing (200).

6. The underwater propulsion device according to any one of claims 2 to 5, characterized in that, The power assembly (300) includes: Motor stator (320), the motor stator (320) is fixed inside the annular housing (200); The motor rotor (330) is rotatably mounted inside the annular housing (200) and is rotatably connected to the motor stator (320) via a bearing (600); The propeller hub (410) rotates synchronously with the motor rotor (330), and the power of the motor rotor (330) is transmitted to the propeller hub (410) through the linkage structure to drive the propeller hub (410) to rotate.

7. The underwater propulsion device according to claim 6, characterized in that, The propeller hub (410) includes a first propeller hub (411) and a second propeller hub (412) arranged coaxially. The plurality of outer blades (430) are spaced apart on the outer circumferential side of the first propeller hub (411), and the plurality of inner blades (420) are spaced apart on the inner side of the second propeller hub (412). The motor rotor (330) includes a first rotor (331) and a second rotor (332) with a structurally adapted design. The first rotor (331) is embedded in the axial gap between the first propeller hub (411) and the second propeller hub (412), and the second rotor (332) is located between the second propeller hub (412) and the annular fairing (100). The second rotor hub (412) is sleeved inside the motor stator (320), and the motor stator (320) is disposed between the first rotor (331) and the second rotor (332). The linkage structure includes a first connecting part (331b) and a second connecting part integrally formed on both sides of the first rotor (331), and a third connecting part integrally formed with the second rotor (332). The first connecting part (331b) is fixedly connected to the end of the first rotor hub (411) near the second rotor hub (412), the second connecting part is connected to the end of the second rotor hub (412) near the first rotor hub (411), and the third connecting part is fixedly connected to the end of the second rotor hub (412) near the annular fairing (100).

8. The underwater propulsion device according to claim 7, characterized in that, The second rotor hub (412) has a first protrusion (412a) protruding at one end near the first rotor hub (411), and a second protrusion (412b) protruding at one end near the annular fairing (100). The second connecting part has a first receiving groove (331a) adapted to the first protrusion (412a), and the third connecting part has a second receiving groove (332a) adapted to the second protrusion (412b). When the second rotor hub (412) is assembled between the first rotor (331) and the second rotor (332), the first protrusion (412a) and the first receiving groove (331a) form a fitting engagement, and the second protrusion (412b) and the second receiving groove (332a) form a fitting engagement.

9. The underwater propulsion device according to claim 6, characterized in that, The motor rotor (330) is sleeved inside the motor stator (320); The linkage structure includes an annular output shaft (340) disposed on the side of the motor rotor (330) away from the motor stator (320). One end of the annular output shaft (340) is fixedly connected to the propeller hub (410), and the other end is rotatably connected to the annular fairing (100).

10. The underwater propulsion device according to claim 6, characterized in that, The underwater propulsion device also includes: Multiple second stator blades (530) are fixedly disposed circumferentially inside the propeller duct (500) and located on the side of the blade assembly (400) away from the annular housing (200). Each of the second stator blades (530) extends toward the central axis of the propeller duct (500), and the ends of the multiple second stator blades (530) away from the inner wall of the propeller duct (500) are fixedly connected by connectors (540).

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