Water area dynamic device, water area propeller and water area movable device

Abstract

This invention provides an underwater power device, an underwater propulsion device, and an underwater mobile device, including a housing, a motor, a sealing device, and a torque output shaft. The housing has a first cavity and a shaft output port communicating with the first cavity. The motor is fixed in the first cavity and is axially connected to the torque output shaft, which passes through the shaft output port. The sealing device includes a first sealing part and a second sealing part disposed between the torque output shaft and the shaft output port, with the first sealing part closer to the motor than the second sealing part. The torque output shaft has a first circumferential sidewall, a second circumferential sidewall, and a blocking wall connecting the first and second circumferential sidewalls. The outer diameter of the first circumferential sidewall is larger than the outer diameter of the second circumferential sidewall. The first circumferential sidewall and the first sealing part are dynamically sealed together, and the second circumferential sidewall and the second sealing part are dynamically sealed together. This improves the underwater motor's dynamic sealing resistance to foreign objects and its environmental adaptability.

Description

Technical Field

[0001] This application relates to the field of aquatic power equipment technology, and in particular to an aquatic power device, aquatic propulsion device, and aquatic mobile equipment. Background Technology

[0002] Currently, some electric outboard motors house the propeller motor within an underwater hull. Since the propeller shaft uses a dynamic seal to seal the gap between the shaft and the underwater hull, existing underwater motor dynamic seal structures generally employ a constant-diameter shaft combined with a single-layer skeleton oil seal and labyrinth seals. These structures suffer from poor resistance to foreign objects, high maintenance costs, concentrated failure risks, and the complexity of labyrinth structures, which cannot completely block fine particles. Consequently, the sealing reliability and environmental adaptability of underwater motors in complex aquatic environments are insufficient. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a water-based power device, a water-based propulsion device, and a water-based mobile device. By improving the dynamic seal structure of the underwater motor, the resistance to foreign objects in the underwater motor's dynamic seal is enhanced, maintenance costs are reduced, and the risk of failure is dispersed, effectively improving its adaptability in complex aquatic environments.

[0004] In a first aspect, the present invention provides an aquatic power device, including a housing, a motor, a sealing device, and a torque output shaft; the housing is provided with a first cavity and a shaft output port communicating with the first cavity, the motor is fixed in the first cavity, the motor is axially connected to the torque output shaft, the torque output shaft passes through the shaft output port, and the sealing device includes a first sealing part and a second sealing part disposed between the torque output shaft and the shaft output port, the first sealing part being closer to the motor than the second sealing part;

[0005] The torque output shaft has a first circumferential sidewall, a second circumferential sidewall, and a blocking wall connected to the first circumferential sidewall and the second circumferential sidewall. The outer diameter of the first circumferential sidewall is larger than the outer diameter of the second circumferential sidewall. The first circumferential sidewall is dynamically sealed to the first sealing part, and the second circumferential sidewall is dynamically sealed to the second sealing part.

[0006] Specifically, the second peripheral sidewall is provided with a spiral guide groove, which is located between the blocking wall and the second sealing part.

[0007] Specifically, the barrier wall includes a vertical surface connecting the second peripheral sidewall and an inclined chamfered surface connecting the vertical surface and the first peripheral sidewall.

[0008] Specifically, the first sealing part is provided with a mechanical seal assembly, and the second sealing part is provided with a lip seal assembly.

[0009] Specifically, the first sealing part and the second sealing part are provided with spring-preloaded floating oil seal assemblies.

[0010] Specifically, the water power device also includes a rotating scraper assembly disposed outside the second sealing portion.

[0011] Specifically, the housing includes a main housing and an end cover that covers the main housing. The motor is fixed inside the main housing. One end of the end cover is fixedly connected to the main housing, and the other end protrudes relative to the main housing. The shaft output port is located on the end cover. The water power device also includes a bearing fixed to the end cover and located in the first cavity. The bearing cooperates with the torque output shaft. The first sealing part and the second sealing part are located on the side of the bearing away from the motor.

[0012] Specifically, the end cover includes a front cover fixed to the main shell cover and a rear cover fixed to the front cover. The front cover has a bearing groove, and the bearing is fixed to the bearing groove. The rear cover has a first sealing groove near the front cover and a second sealing groove away from the front cover, as well as a cavity located between the first sealing groove and the second sealing groove. The first sealing part is fixed to the first sealing groove, the second sealing part is fixed to the second sealing groove, and a first sensor is disposed in the cavity.

[0013] Specifically, a drain hole is provided at the bottom of the back cover, a cavity is formed between the first sealing part and the second sealing part, the cavity is connected to the drain hole, and a one-way valve is provided in the drain hole. The one-way valve allows water in the cavity to drain out and prevents water outside the cavity from entering.

[0014] Specifically, the aquatic power unit also includes an alarm that is electrically connected to the first sensor.

[0015] Specifically, the water power device further includes a motor controller, which is fixed in the first cavity on the side away from the output port of the rotating shaft and electrically connected to the motor.

[0016] Specifically, the aquatic power unit includes a propeller connected to one end of the torque output shaft that passes through the output port of the shaft.

[0017] Secondly, this utility model provides a water propulsion device, including the water power device in the first aspect of this utility model. The water propulsion device also includes a body connected to the housing and a bracket connected to the body, and the bracket is used for connecting a water carrier.

[0018] Thirdly, this utility model provides a water-based mobile device, including the water propulsion device in the second aspect of this utility model, and a water-based carrier.

[0019] As can be seen from this embodiment, the underwater power device includes a housing, a motor, a sealing device, and a torque output shaft. The housing has a first cavity and a shaft output port communicating with the first cavity. The motor is fixed in the first cavity and is axially connected to the torque output shaft, which passes through the shaft output port. The sealing device includes a first sealing part and a second sealing part disposed between the torque output shaft and the shaft output port, with the first sealing part closer to the motor than the second sealing part. The torque output shaft has a first circumferential sidewall, a second circumferential sidewall, and a blocking wall connecting the first and second circumferential sidewalls. The outer diameter of the first circumferential sidewall is larger than the outer diameter of the second circumferential sidewall. The first circumferential sidewall and the first sealing part are dynamically sealed together, and the second circumferential sidewall and the second sealing part are dynamically sealed together. This improves the underwater motor's dynamic seal's resistance to foreign objects, reduces maintenance costs, and disperses the risk of failure, effectively enhancing its adaptability in complex aquatic environments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the internal cross-sectional structure of a hydrodynamic device provided in an embodiment of this utility model;

[0022] Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A partial cross-sectional view of the sealing device in the diagram;

[0023] Figure 3 This is a schematic diagram of the overall structure of a detachable oil seal module provided in an embodiment of this utility model;

[0024] Figure 4 This is a partial cross-sectional view of another aquatic power device provided in this embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of a water-based mobile device provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of another water-based mobile device provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the connection structure of a water power device provided in an embodiment of the present invention.

[0028] Figure label:

[0029] The components include: a water-based power unit 10, a housing 100, a main housing 101, an end cover 102, a front cover 103, a rear cover 104, a first cavity 110, a shaft output port 120, a bearing 130, a motor 200, a motor controller 210, a sealing device 300, a first sealing part 310, a second sealing part 320, a drain hole 330, a one-way valve 340, an open retaining ring 350, an oil seal 360, an oil seal seat 370, a torque output shaft 400, a first peripheral side wall 410, a second peripheral side wall 420, a blocking wall 430, a vertical surface 431, an inclined chamfered surface 432, a cavity 433, a spiral guide groove 440, a first sensor 500, a detachable oil seal module 600, a propeller 700, a screw 701, a water-based thruster 20, a head unit 21, a guide pipe 22, a pod thruster 30, and a flange 31. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0032] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article indicates that the preceding and following related objects have an "or" relationship.

[0033] In this embodiment of the invention, "multiple" refers to two or more. In this embodiment of the invention, "connection" refers to various connection methods, such as direct or indirect connection, to achieve communication between devices; this embodiment of the invention does not impose any limitations on this.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] Currently, some electric outboard motors house the propeller motor within an underwater hull. Since the propeller shaft uses a dynamic seal to seal the gap between the shaft and the underwater hull, existing underwater motor dynamic seal structures generally employ a constant-diameter shaft combined with a single-layer skeleton oil seal and labyrinth seals. These structures suffer from poor resistance to foreign objects, high maintenance costs, concentrated failure risks, and the complexity of labyrinth structures, which cannot completely block fine particles. Consequently, the sealing reliability and environmental adaptability of underwater motors in complex aquatic environments are insufficient.

[0036] To address the aforementioned problems, this application provides a water-based power device 10. Please refer to... Figure 1 , Figure 1 This is a schematic diagram of the internal cross-sectional structure of a water power device 10 provided in an embodiment of this utility model, as shown below. Figure 1 As shown, the water power unit 10 includes a housing 100, a motor 200, a sealing device 300, and a torque output shaft 400. The housing 100 has a first cavity 110 and a shaft output port 120 communicating with the first cavity 110. The motor 200 is fixed inside the first cavity 110 and is axially connected to the torque output shaft 400. The torque output shaft 400 passes through the shaft output port 120. The sealing device 300 includes a first sealing part 310 and a second sealing part 320 disposed between the torque output shaft 400 and the shaft output port 120. The first sealing part 310 is closer to the motor than the second sealing part 320.

[0037] The motor controller 210 is fixed inside the first cavity 110 on the side away from the output port 120 of the rotating shaft, and is electrically connected to the motor 200.

[0038] It is understandable that the motor 200 is fixed to the first cavity 110 and "shaft connected" with the torque output shaft 400 to realize the conversion and transmission of electrical energy to mechanical energy. The torque output shaft 400 passes through the shaft output port 120 and becomes a key component for transmitting power outward.

[0039] The sealing device 300, with a two-stage (multi-stage) structure of "first sealing part 310 and second sealing part 320 side by side," is arranged between the torque output shaft 400 and the shaft output port 120, with the first sealing part 310 closer to the motor 200. This multi-stage sealing enhances waterproofing and leak-proof capabilities, enabling it to cope with complex aquatic environments and solving the reliability issues of traditional single-stage seals.

[0040] Further, see Figure 2 , Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A partial cross-sectional view of the sealing device in the diagram, as shown below. Figure 2 As shown, the torque output shaft 400 has a first peripheral sidewall 410, a second peripheral sidewall 420, and a blocking wall 430 connected to the first peripheral sidewall 410 and the second peripheral sidewall 420. The outer diameter of the first peripheral sidewall is larger than the outer diameter of the second peripheral sidewall. The first peripheral sidewall 410 is dynamically sealed with the first sealing part 310, and the second peripheral sidewall 420 is dynamically sealed with the second sealing part 320.

[0041] In one possible embodiment, the barrier wall 430 includes a vertical surface 431 connecting the second peripheral sidewall 420 and an inclined chamfered surface 432 connecting the vertical surface 431 and the first peripheral sidewall 410.

[0042] Among them, the torque output shaft 400 is designed with a stepped peripheral sidewall. By utilizing the size difference that "the outer diameter of the first peripheral sidewall is greater than the outer diameter of the second peripheral sidewall", and based on the blocking wall 430 between the first peripheral sidewall 410 and the second peripheral sidewall 420, a "stepped transition" shape is constructed to achieve the blocking of debris.

[0043] It is understandable that stable and reliable sealing performance is achieved through the dynamic sealing cooperation between the first peripheral sidewall 410 and the first sealing part 310, and the dynamic sealing cooperation between the second peripheral sidewall 420 and the second sealing part 320.

[0044] Specifically, the second peripheral sidewall 420 is the outer peripheral side of the torque output shaft 400 near the shaft output port 120. This means that when debris leaks into the shaft output port 120 and continues to leak through it, it will first encounter the second peripheral sidewall 420 and the second sealing part 320, which seals against the second peripheral sidewall 420. In other words, the second sealing part 320 will initially block the leaking debris. However, if there is a large amount of leaking debris, the leakage pressure is high, or the second sealing part 320 is potentially damaged or malfunctioning, some debris will still continue to leak through the second sealing part 320 and reach the position between the second sealing part 320 and the first sealing part 310. When some debris leaks between the second sealing part 320 and the first sealing part 310, it will be blocked by the vertical surface 431, preventing the debris from continuing to leak along the second peripheral sidewall 420 towards the first peripheral sidewall 410. The vertical surface 431 of the barrier wall 430 is connected to the second peripheral side wall 420, and the inclined chamfered surface 432 is connected to the first peripheral side wall 410. When external debris seeps into the second sealing part 320 and penetrates inward along the axis of rotation, the barrier wall 430 directly blocks the debris from continuing to penetrate into the first sealing part 310 by utilizing its own vertical shape, confining the debris to the area enclosed by the second peripheral side wall 420 and the vertical surface 431, and preventing the debris from contacting the innermost main sealing structure.

[0045] Furthermore, the inclined chamfered surface 432 serves to smooth the transition and avoid stress concentration issues caused by right-angle steps. On the other hand, the presence of the inclined chamfered surface 432 can also guide a small amount of infiltrated debris to converge towards the vertical surface 431, facilitating subsequent processing such as... Figure 3 The drain hole 330 and check valve 340 shown provide drainage, ensuring the sealing reliability of the main sealing structure.

[0046] In one possible embodiment, the step difference ΔH between the outer diameter of the first circumferential sidewall 410 and the outer diameter of the second circumferential sidewall 420 is 1-5 mm; the chamfer on the inclined chamfered surface 432 is 45°.

[0047] For example, the inclined chamfered surface 432 includes, but is not limited to, being a tapered transition surface instead of a right-angled step. This application does not limit the specific values ​​of the outer diameters of the first and second peripheral sidewalls, the chamfer angle corresponding to the chamfered surface, and the chamfered surface shape; these need to be adapted and determined in conjunction with the dimensions of the other structural components of the underwater motor.

[0048] As can be seen, in this embodiment of the utility model, by designing the torque output shaft 400 with a structure in which "the outer diameter of the first circumferential sidewall 410 is larger than the outer diameter of the second circumferential sidewall 420", and combining it with a barrier wall 430 containing a vertical surface 431 and an inclined chamfered surface 432, the vertical surface 431 effectively blocks the penetration of debris from the second sealing part 320 into the first sealing part 310, limiting the debris to a specific area. The inclined chamfered surface 432 also enables a smooth transition and avoids stress concentration, and guides the infiltrated debris to converge so that it can be discharged through the drainage structure. This achieves stable and reliable layered sealing protection, and improves the sealing performance and environmental adaptability of the dynamic sealing system of the water dynamic device 10.

[0049] More specifically, in the embodiments of this application, the torque output shaft 400 includes a shaft body and a bushing sleeved on the shaft body. The bushing is fixed to the shaft body and fits tightly. A first peripheral sidewall 410 is disposed on the outer peripheral wall of the bushing. A second peripheral sidewall 420 is disposed on the outer peripheral wall of the shaft body, and a blocking wall 430 is disposed on the end sidewall of the bushing near the first peripheral sidewall 410. Of course, in other embodiments, the bushing and shaft body can be integrally disposed, that is, by machining a step in the outer peripheral sidewall of the shaft, the blocking wall 430 is formed in the step, so as to realize the structure in which the first peripheral sidewall 410, the blocking wall 430 and the second peripheral sidewall 420 are arranged in sequence, and the blocking wall 430 is used to block debris.

[0050] The following is combined Figure 3 ,by Figures 1-2 Based on this, the structural components corresponding to the sealing device 300 will be further explained.

[0051] Please see Figure 3 , Figure 3 This is a schematic diagram of the internal cross-sectional structure of a detachable oil seal module provided in an embodiment of this utility model, as shown below. Figure 3 The detachable oil seal module 600 is an independent, integrated structure that encapsulates the sealing device 300 (including the first sealing part 310, the second sealing part 320, etc.). "Integrated module assembly and disassembly" is achieved through connection structures such as screw holes and positioning structures. During maintenance, there is no need to disassemble the motor or shaft; by directly replacing the detachable oil seal module 600, maintenance time is significantly reduced.

[0052] The detachable oil seal module 600 has an internal mounting cavity that adapts to the first sealing part 310 and the second sealing part 320, and is also provided with an opening retaining ring 350, an oil seal 360 and an oil seal seat 370.

[0053] Specifically, the oil seal seat 370 serves as a basic load-bearing component, providing installation space for the oil seal 360, the open retaining ring 350, etc. The open retaining ring 350 is used to axially limit the oil seal 360, ensuring that the oil seal 360 is stable in position during operation. The oil seal 360 constitutes key sealing structures such as the first sealing part 310 and the second sealing part 320, and is adapted to the torque output shaft 400, achieving dynamic sealing by tightly fitting its lip with the shaft.

[0054] The first sealing part 310 is the main sealing area. The corresponding oil seal in the oil seal 360 can be a fluororubber oil seal, which is a high-pressure compensation type oil seal. The compensation type oil seal refers to an oil seal with a stainless steel spring. After the main lip wears, the spring continuously provides a radial force, which will continuously press the main lip in the radial direction to ensure that the main lip is in close contact with the shaft and that there is no sealing failure. Hence, it is called a compensation type oil seal. The second sealing part 320 is the vulnerable area and adopts modular installation, which can be quickly disassembled and replaced. The oil seal in the corresponding part of the second sealing part 320 in the oil seal 360 is preferably a polyurethane skeleton oil seal, which has good wear resistance.

[0055] Furthermore, in the selection and preparation of oil seal materials, nano-carbon fiber reinforced rubber composite materials can be used to optimize the friction and wear resistance of the seal, reducing the coefficient of friction by 40%. This is suitable for high-speed aquatic power devices or complex waters containing silt and fine particles, directly improving the environmental adaptability of the seal through material properties. Additionally, a diamond-like coating can be applied to the surface of the metal skeleton of the oil seal to achieve ultra-hard wear resistance and low friction, improving corrosion resistance. In highly corrosive environments such as deep sea, high salinity, or hydrothermal areas, it can significantly extend the life of metal components. Combined with nano-carbon fiber rubber seals, this forms a synergistic material protection system of "seals and supporting skeleton".

[0056] Understandably, the sealing device 300 features a detachable modular design, allowing for quick disassembly and replacement of easily damaged sealing components, in conjunction with... Figures 1-2 The assembly relationship between the motor housing 100 and the torque output shaft 400 is achieved through a two-stage (or multi-stage) oil seal arrangement, combined with functions such as drainage and foreign object prevention, to realize reliable dynamic sealing protection for the motor 200, improve the adaptability and stability of the water power device 10 in complex environments, and solve the problems of difficult maintenance and insufficient sealing reliability of traditional sealing structures.

[0057] In one possible embodiment, the first sealing portion 310 is provided with a mechanical seal assembly, and the second sealing portion 320 is provided with a lip seal assembly.

[0058] Specifically, the first sealing part 310 adopts a mechanical seal, and the second sealing part 320 may adopt a PTFE lip seal.

[0059] Among them, PTFE (polytetrafluoroethylene) material itself has the characteristics of high temperature resistance, strong corrosion resistance and low friction. It can withstand the high temperature and corrosive environment of hydrothermal vents, ensuring the sealing reliability of the engine room. Its high temperature resistance is improved (up to 200℃), making it suitable for deep-sea hydrothermal vent operation environment.

[0060] Understandably, mechanical seals, as the core of the main seal, can block most liquids and impurities, making them suitable for high-pressure and high-speed operating conditions. Lip seals (such as rubber lip seals), as primary protection, have a simple structure and flexible lips that can adaptively compensate for slight deviations in the shaft. At the same time, they form the first elastic interception against fine impurities, making them suitable for medium and low-pressure operating conditions.

[0061] In one possible embodiment, the first sealing portion 310 and the second sealing portion 320 are provided with a spring-preloaded floating oil seal assembly.

[0062] Among them, the spring-preloaded floating oil seal (similar to the floating oil seal in engineering machinery) provides continuous radial force through the spring, ensuring that the oil seal lip always fits the shaft and compensates for wear. Both stages of the seal use this structure, which can achieve "double redundancy and self-compensation" sealing: even if the lip of the first-stage oil seal loosens due to wear, the spring preload force pushes the lip back to its original position; with the two stages working together, the sealing pressure distribution is more uniform, adapting to shaft vibration and sway conditions.

[0063] As can be seen, in this embodiment of the utility model, the first sealing part 310 and the second sealing part 320 are provided with a spring preloaded floating oil seal assembly. With the segmented contact of the stepped shaft, the spring preload can be optimized in different outer diameter shaft sections—the unit pressure is reduced in the large outer diameter section to prevent excessive wear, and the pressure is increased in the small outer diameter section to strengthen the seal, thus solving the problem of sealing failure caused by shaft vibration and wear in traditional oil seals.

[0064] In one possible embodiment, the water power unit 10 further includes a rotating scraper assembly disposed outside the second seal portion 320.

[0065] The rotary scraper assembly (scraper blades and spiral scrapers that rotate synchronously with the shaft) can actively clean up attached debris (such as tangled aquatic plants and accumulated mud and sand) on the outside of the second sealing part 320. When the shaft rotates, the scraper cuts and throws away linear and granular debris near the sealing part, reducing the pressure and wear of debris on the second sealing part 320 from the source.

[0066] As can be seen, in this embodiment of the utility model, the rotating scraper assembly disposed on the outside of the second sealing part 320, together with the static guidance of the stepped shaft and the dynamic debris removal of the spiral guide groove 440, forms a "three-level anti-foreign matter" system: the stepped shaft blocks large debris, the spiral guide groove 440 discharges fine particles, and the rotating scraper cleans the debris attached to the sealing part, which greatly reduces the risk of foreign matter jamming the seal and solves the pain point problem that the sealing part is easily corroded and fails by debris in complex waters, especially suitable for waters with dense aquatic plants and a lot of silt.

[0067] Please see Figure 4 , Figure 4 This is a partial cross-sectional view of another aquatic power device provided in this embodiment of the present invention, combined with... Figure 2 ,like Figure 4 As shown, the second circumferential sidewall 420 is provided with a spiral guide groove 440, which is located between the blocking wall 430 and the second sealing part 320.

[0068] Understandably, when the torque output shaft 400 rotates, the spiral guide groove 440 acts like a "screw pump," using the axial thrust generated by the spiral structure to push fine particles and linear debris fragments (such as aquatic plant fibers and silt) that are not completely intercepted by the blocking wall 430 along the guide groove in a direction away from the second sealing part 320, thus preventing debris from accumulating and getting stuck near the sealing part and enhancing the resistance to foreign objects from a dynamic perspective.

[0069] It should be clarified that the specific dimensions of the pitch of the spiral guide groove 440 are determined by balancing flow efficiency and structural strength; this application only provides one example. A pitch that is too small can easily cause debris to get stuck in the groove, while a pitch that is too large will result in insufficient flow thrust. A reasonable pitch range can create a stable "debris removal flow field" when the shaft rotates, which, combined with the static guidance of the stepped shaft, forms a dual debris-prevention system of "static blocking and dynamic discharge."

[0070] A cavity 433 is formed between the first sealing part 310 and the second sealing part 320. The cavity 433 is connected to the drain hole 330. A one-way valve 340 is provided in the drain hole 330. The one-way valve 340 allows water in the cavity to drain out and prevents water outside the cavity from entering.

[0071] Understandably, the combination of the cavity 433 between the first sealing part 310 and the second sealing part 320, the drain hole 330, and the one-way valve 340 solves the problem of "liquid accumulation in the sealing cavity". Even if a small amount of water or water vapor permeates through the second sealing part 320, it will be confined within the cavity 433 between the two sealing parts; the drain hole 330 connects the cavity 433 to the outside, and through the "one-way conduction" characteristic of the one-way valve 340, the accumulated liquid is discharged in a directional manner, preventing the pressure from rising after the liquid accumulates in the cavity, which would cause the pressure in the cavity 433 to exceed the sealing pressure of the first sealing part 310, thereby causing the first sealing part 310 to fail, and the water in the cavity 433 to permeate into the first cavity 110 through the first sealing part 310.

[0072] Furthermore, a first sensor 500 is also installed inside the cavity 433.

[0073] In one possible embodiment, the water power unit 10 also includes an alarm electrically connected to the first sensor 500.

[0074] The first sensor 500 can monitor the state inside the cavity in real time (such as the amount of liquid accumulated, changes in air pressure, etc.). When the second seal 320 fails, causing external water to seep into the cavity 433, the first sensor 500 can sense the water or abnormal air pressure and issue an alarm signal. Furthermore, after receiving the abnormal signal from the first sensor 500 via electrical connection, the alarm provides feedback to the operator through sound, light, or mechanical prompts, avoiding the passive situation of "discovering failure only after failure" in traditional sealing structures. This significantly reduces the risk of water ingress into the motor and equipment damage due to seal failure, and improves the reliability of the sealing system.

[0075] As can be seen, in this embodiment of the utility model, the spiral guide groove 440 at the second circumferential sidewall 420 enables dynamic drainage of debris. Combined with the double-stage sealing cavity, drainage hole 330 and one-way valve 340, the liquid is drained in a directional manner to prevent liquid accumulation and seepage. With the first sensor 500 in the cavity monitoring abnormalities in real time, and the alarm connected by electricity providing timely warning of sealing risks, the multiple structures work together to enhance the resistance to foreign objects, solve the problem of liquid accumulation, and achieve early warning of failure, which greatly improves the reliability and environmental adaptability of the underwater motor dynamic seal.

[0076] Understandably, the water propulsion unit 10 is the core component that provides propulsion and can be configured on the water thruster 20. The water thruster 20 also includes a body that connects to the housing 100 and a bracket that connects to the body. The bracket is used to connect water carriers such as small boats, underwater robots, and buoys. This solves the problem of "connection compatibility" between the propulsion unit and the carrier, realizes the upgrade from "single power component" to "modular thruster", and expands the flexibility of application scenarios.

[0077] Furthermore, the aquatic mobile device includes an aquatic thruster 20 and an aquatic carrier. The aquatic mobile device represents the final application form, integrating the "thruster (power) and the carrier (load-bearing)" to create a device with complete mobility. For example, if the aquatic carrier is an underwater robot, the thruster provides power to move it underwater; if the carrier is a small fishing boat, the thruster propels it forward. This clarifies the end-application scenarios of the technical solution.

[0078] The following is combined with Figures 5-6 ,right Figure 4 The location and layout of the alarm described herein shall be explained.

[0079] Please see Figure 5 , Figure 6 , Figure 5 This is a schematic diagram of the structure of a water-based mobile device provided in an embodiment of the present invention. Figure 6 This is a structural schematic diagram of a water-based mobile device provided in an embodiment of the present invention, as shown below. Figure 5 , Figure 6 As shown, the water-based mobile equipment equipped with the water-based power unit 10 is divided into two categories: external water-based thrusters 20 and integrated pod thrusters 30.

[0080] Figure 5 In this design, the water propulsion unit 20 is externally mounted to the stern of the hull via a clamping structure. The propulsion unit 20 includes an exposed head 21 and a guide pipe 22. The head 21 is completely exposed above the water, and the alarm can be directly embedded in the outer shell of the head 21. Utilizing the "visibility above the water" of the head 21, the operator can quickly detect the alarm signal from their operating position (such as the bridge at the stern). The guide pipe 22 encloses the internal rotating shaft and sealing structure, providing support and connection for the head 21 and the water propulsion unit 10. Part of the guide pipe 22 is exposed above the water. If there is insufficient space in the head 21, an alarm can be installed on the upper part (above the water section) of the guide pipe 22 and fixed with a waterproof bracket.

[0081] Figure 6 In this design, the podded thruster 30 is connected to the bottom of the hull (e.g., via flange 31 / fixed mount), while components such as the drive unit and battery are integrated into the hull. The drive unit is primarily responsible for driving and controlling the motor. The battery provides power to the podded thruster 30. The alarm can be installed inside the hull, on the battery, or on the drive unit.

[0082] As can be seen, in this embodiment, the water propulsion device is configured into two types: external and integrated. The external type utilizes the structural features of the nose cone 21 and the guide pipe 22 to flexibly place the alarm in a visible area on the water, facilitating quick detection by the operator. The integrated type, on the other hand, relies on the internal space of the hull to adapt the alarm to components such as batteries or drivers within the cabin, meeting the needs of different installation scenarios. This diverse alarm placement design not only adapts to the structural differences between external and integrated propulsion devices but also ensures that alarm signals can be detected promptly when used on different waterborne platforms such as small boats and underwater robots, improving the safety and scenario adaptability of mobile waterborne devices.

[0083] Please see Figure 7 , Figure 7 This is a schematic diagram of the connection structure of a water power device 10 provided in an embodiment of this utility model, as shown below. Figure 7 As shown, the housing 100 includes a main housing 101 and an end cover 102 that covers the main housing 101. The motor 200 is fixed inside the main housing 101. One end of the end cover 102 is fixedly connected to the main housing 101, and the other end protrudes relative to the main housing 101. The shaft output port 120 is located on the end cover.

[0084] Furthermore, combined Figure 2 It is known that the water power device 10 also includes a bearing 130 fixed to the end cover 102 and located in the first cavity 110. The bearing 130 cooperates with the torque output shaft 400. The first sealing part 310 and the second sealing part 320 are located on the side of the bearing 130 away from the motor 200.

[0085] The end cap 102 includes a front cover 103 fixed to the main shell 101 and a rear cover 104 fixed to the front cover 103.

[0086] Furthermore, the front cover 103 is provided with a bearing groove, the bearing 130 is fixed in the bearing groove, the rear cover 104 is provided with a first sealing groove near the front cover 103 and a second sealing groove away from the front cover 103, as well as a cavity located between the first sealing groove and the second sealing groove, the first sealing part 310 is fixed in the first sealing groove, and the second sealing part 320 is fixed in the second sealing groove.

[0087] Furthermore, combined Figure 4 It can be seen that a drainage hole 330 is provided at the bottom of the back cover 104.

[0088] In one possible embodiment, the aquatic power unit 10 includes a propeller 700 connected to a torque output shaft 400 passing through one end of a shaft output port 120.

[0089] Among them, the internal structure corresponding to the rear cover 104 is a detachable oil seal module 600, which is detachably connected to the propeller 700 by screws 701.

[0090] As can be seen, in this embodiment of the utility model, from the main shell 101 to the end cover 102, the sealing device 300, and then to the propeller 700, each component is precisely connected by connectors, which not only ensures the coaxiality of power transmission, but also facilitates fault diagnosis and component replacement (for example, if the sealing device 300 fails, it can be disassembled and replaced separately without disassembling the whole machine), thus solving the problem of difficult maintenance of traditional integrated structures.

[0091] To enable those skilled in the art to understand this application, the waterproofing process of the dynamic sealing structure will be described using the example of the aquatic power device provided in the embodiment of this utility model operating in a river environment.

[0092] In its initial state, the aquatic power unit is installed on the vessel, ready for use in a river environment. At this time, all components of the unit are properly assembled and well-sealed. The motor 200 is housed inside the housing 100, and the torque output shaft 400 passes through the shaft output port 120 of the housing 100 and is connected to the external propeller 700. The first sealing part 310 and the second sealing part 320 of the sealing device 300 are tightly fitted to the first circumferential sidewall 410 and the second circumferential sidewall 420 of the torque output shaft 400, respectively.

[0093] During the protective phase of operation, when the device starts, the motor 200 drives the torque output shaft 400 to rotate at high speed, which in turn drives the propeller 700 to rotate, propelling the vessel forward. During this process, debris in the water (such as weeds and silt) will approach the device with the current. The spiral guide groove 440 on the second-cycle sidewall 420 rotates with the shaft, generating axial thrust (similar to the principle of a screw pump). Approximately 80% of the debris is actively discharged by the spiral guide groove 440, preventing it from contacting the sealing part. A small amount of silt, weeds, and other debris that are not discharged by the guide groove moves with the current towards the inside of the shaft. Approximately 15% of the remaining debris is intercepted by the blocking wall 430, significantly reducing the probability of the first sealing part 310 contacting debris.

[0094] Furthermore, a very small amount of water or fine sediment that penetrates the first two lines of defense comes into contact with the sealing device 300. The main lip of the second sealing part 320 (fluororubber compensating oil seal) is fitted to the second circumferential sidewall 420. Utilizing the elasticity of fluororubber and the pre-tightening force of the stainless steel spring, it tightly wraps the rotating shaft. The trace amounts of water and sediment are intercepted by the lip and cannot penetrate inward. If a very small amount of water penetrates through the second sealing part 320 and comes into contact with the first sealing part 310, the first sealing part 310 uses a polyurethane skeleton oil seal to intercept the water a second time, improving the reliability of waterproofing.

[0095] If, due to extreme operating conditions (such as short-term wear of the second seal 320 caused by a large amount of mud and sand impact), a trace amount of water seeps into the cavity 433 between the two seals, the first sensor 500 inside the cavity 433 will monitor this in real time and trigger a signal; the one-way valve 340 will open, and the accumulated liquid will be discharged into the external water area through the drain hole 330, preventing the pressure of the accumulated water from damaging the first seal 310. The signal from the first sensor 500 will be transmitted to the cockpit alarm, which will provide a red light and a buzzer, allowing the operator to stop the machine in time to check the second seal 320 and prevent the seal failure from escalating.

[0096] It is important to clarify that this process is only one possible example. In actual applications, adaptive adjustments are necessary based on specific aquatic environments (such as deep sea, lakes, and shallow waters), power unit types (outboard motors, podded propulsion systems, underwater robot propulsion systems, etc.), and operating parameters (rotation speed, water pressure, and debris concentration). For example, in the high-pressure environment of the deep sea, the pressure resistance of the double-stage seal material needs to be strengthened (e.g., using a metal bellows mechanical seal instead of a lip seal); in shallow waters with dense aquatic plants, the pitch of the spiral guide groove can be increased or a rotating scraper assembly can be added to improve debris removal efficiency; under high-vibration conditions, the coaxiality design of the bearing and the seal needs to be optimized to avoid accelerated seal wear due to shaft misalignment. In addition, the monitoring threshold of the sensor and the response logic of the alarm also need to be calibrated according to the actual usage scenario to ensure timely warnings and avoid false alarms, ultimately achieving a dynamic balance of "environmental adaptability and functional reliability."

[0097] As can be seen, in this embodiment of the utility model, the water power device 10 includes a housing 100, a motor 200, a sealing device 300, and a torque output shaft 400; the housing 100 is provided with a first cavity 110 and a shaft output port 120 communicating with the first cavity 110; the motor 200 is fixed inside the first cavity 110 and is axially connected to the torque output shaft 400; the torque output shaft 400 passes through the shaft output port 120; the sealing device 300 includes components disposed on the torque output shaft 400 and the shaft output port 120. A first sealing portion 310 and a second sealing portion 320 are located between the motor 200 and the second sealing portion 320. The first sealing portion 310 is closer to the motor 200 than the second sealing portion 320. The torque output shaft 400 has a first circumferential sidewall 410, a second circumferential sidewall 420, and a blocking wall 430 connecting the first circumferential sidewall 410 and the second circumferential sidewall 420. The outer diameter of the first circumferential sidewall 410 is larger than the outer diameter of the second circumferential sidewall 420. The first circumferential sidewall 410 and the first sealing portion 310 are dynamically sealed together, and the second circumferential sidewall 420 and the second sealing portion 320 are dynamically sealed together. In this way, the resistance of the underwater motor's dynamic seal to foreign objects is improved, maintenance costs are reduced, and the risk of failure is dispersed, effectively improving its adaptability in complex aquatic environments.

[0098] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0099] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0100] In the several embodiments provided by this utility model, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0101] The unit described as a separate component may or may not be physically separate. The component shown as a unit may or may not be a physical unit. It may be located in one place or distributed across multiple network units.

[0102] Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0103] Furthermore, in the various embodiments of this utility model, the functional units can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0104] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A water-based power device, characterized in that, The water power device includes a housing, a motor, a sealing device, and a torque output shaft; the housing has a first cavity and a shaft output port communicating with the first cavity, the motor is fixed in the first cavity, the motor is axially connected to the torque output shaft, the torque output shaft passes through the shaft output port, and the sealing device includes a first sealing part and a second sealing part disposed between the torque output shaft and the shaft output port, the first sealing part being closer to the motor than the second sealing part; The torque output shaft has a first circumferential sidewall, a second circumferential sidewall, and a blocking wall connected to the first circumferential sidewall and the second circumferential sidewall. The outer diameter of the first circumferential sidewall is larger than the outer diameter of the second circumferential sidewall. The first circumferential sidewall is dynamically sealed to the first sealing part, and the second circumferential sidewall is dynamically sealed to the second sealing part.

2. The aquatic power device according to claim 1, characterized in that, The second peripheral sidewall is provided with a spiral guide groove, which is located between the blocking wall and the second sealing part.

3. The aquatic power device according to claim 1 or 2, characterized in that, The barrier wall includes a vertical surface connecting the second peripheral sidewall and an inclined chamfered surface connecting the vertical surface and the first peripheral sidewall.

4. The aquatic power device according to claim 1, characterized in that, The first sealing part is provided with a mechanical seal assembly, and the second sealing part is provided with a lip seal assembly.

5. The aquatic power device according to claim 1, characterized in that, The first sealing part and the second sealing part are provided with spring-preloaded floating oil seal assemblies.

6. The aquatic power device according to claim 1, characterized in that, The water power unit also includes a rotating scraper assembly disposed outside the second sealing part.

7. The aquatic power device according to claim 1, characterized in that, The housing includes a main housing and an end cap that covers the main housing. The motor is fixed inside the main housing. One end of the end cap is fixedly connected to the main housing, and the other end protrudes relative to the main housing. The shaft output port is located on the end cap. The water power device also includes a bearing fixed to the end cap and located in the first cavity. The bearing cooperates with the torque output shaft. The first sealing part and the second sealing part are located on the side of the bearing away from the motor.

8. The aquatic power device according to claim 7, characterized in that, The end cap includes a front cover fixed to the main shell cover and a rear cover fixed to the front cover. The front cover has a bearing groove, and the bearing is fixed to the bearing groove. The rear cover has a first sealing groove near the front cover and a second sealing groove away from the front cover, as well as a cavity located between the first sealing groove and the second sealing groove. The first sealing part is fixed to the first sealing groove, the second sealing part is fixed to the second sealing groove, and a first sensor is disposed in the cavity.

9. The aquatic power device according to claim 8, characterized in that, The bottom of the back cover is provided with a drain hole, and a cavity is formed between the first sealing part and the second sealing part. The cavity is connected to the drain hole, and a one-way valve is provided in the drain hole. The one-way valve allows water in the cavity to drain out and prevents water outside the cavity from entering.

10. The aquatic power device according to claim 8, characterized in that, The aquatic power unit also includes an alarm that is electrically connected to the first sensor.

11. The aquatic power device according to claim 1, characterized in that, The water power device also includes a motor controller, which is fixed in the first cavity on the side away from the output port of the rotating shaft and is electrically connected to the motor.

12. The aquatic power device according to claim 1, characterized in that, The aquatic power unit includes a propeller connected to one end of the torque output shaft that passes through the output port of the shaft.

13. A water propulsion device, characterized in that, The water propulsion device includes any one of claims 1 to 12, wherein the water propulsion device further includes a body connected to the housing and a bracket connected to the body, the bracket being used for connection to a water carrier.

14. A water-based mobile device, characterized in that, It includes the water propulsion device as described in claim 13, and includes a water carrier.

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