Shaftless blade fluid power device based on axial flux motor

Abstract

The invention relates to the field of fluid power devices, in particular to a shaftless paddle fluid power device based on an axial flux motor, which comprises an outer shell, a stator assembly, a rotor assembly and a propeller, the stator assembly is arranged in the outer shell, the outer shell is provided with a through hole extending along the axial direction of the outer shell, and the rotor assembly is arranged in the through hole. The propeller is installed in the through hole, and the two rotor assemblies are located on the two sides of the propeller in the axial direction of the propeller and abut against the two sides of the propeller in the axial direction of the propeller. By integrating the axial magnetic flux motor and the shaftless paddle structure, a traditional mechanical transmission shaft is omitted, and the overall structure is remarkably simplified. By means of the design, the size of the device is greatly reduced, miniaturization and integration can be achieved conveniently, and the device is particularly suitable for application scenes with strict space requirements, such as underwater robots and portable propelling equipment.

Description

Technical Field

[0001] The present invention relates to the field of hydrodynamic devices, and particularly to a shaftless blade hydrodynamic device based on an axial flux motor. Background Art

[0002] In the field of hydrodynamic devices, traditional technical solutions usually rely on complex mechanical drive shaft systems to achieve power transmission. Such designs have multiple technical drawbacks:

[0003] 1. Traditional devices often include long mechanical drive shafts and multiple connecting components, resulting in a complex overall structure and large volume, making it difficult to achieve miniaturization and integration designs, and restricting their applications in compact spaces or portable devices.

[0004] 2. Significant energy losses, such as frictional losses and vibration losses, will occur during the power transmission of mechanical drive shafts, leading to a reduction in the overall energy transmission efficiency, increasing energy consumption and operating costs.

[0005] 3. Traditional devices usually include multiple sealing parts, such as drive shaft through-wall seals and bearing seals. These sealing parts are prone to leakage due to wear, aging, or improper installation, reducing the sealing performance and reliability of the devices.

[0006] 4. Due to the complex structure and poor sealing performance, traditional devices require frequent maintenance and servicing, such as replacing seals and lubricating drive shafts, increasing maintenance costs. At the same time, the wear and corrosion of mechanical components also shorten the service life of the devices. Summary of the Invention

[0007] To solve the above problems, the present invention provides a shaftless blade hydrodynamic device based on an axial flux motor, achieving multiple beneficial effects such as compact structure, improved energy transmission efficiency, enhanced sealing performance, strong adaptability, and reduced maintenance costs.

[0008] To achieve the above object, the technical solution adopted by the present invention is: a shaftless blade hydrodynamic device based on an axial flux motor, including a housing, a stator assembly, a rotor assembly, and a propeller. The stator assembly is installed inside the housing. The housing is provided with a through-hole extending along its axial direction. The propeller is installed in the through-hole. The two rotor assemblies are located on both sides of the propeller along its axial direction and are in contact with both sides of the propeller along its axial direction.

[0009] Further, the propeller includes a ring and blades, and the blades are an integral structure or a detachable structure with the ring.

[0010] Further, the blades include propeller-type blades, impeller-type blades, or guide-type blades.

[0011] Further, the rotor assembly includes a rotor housing and a plurality of permanent magnets installed inside the rotor housing; the gap between the rotor housing and the permanent magnets is filled with a glue solution for sealing the permanent magnets.

[0012] Further, the rotor housing is of an annular structure, and the inner ring of the rotor housing is fitted with the circular ring through a connecting member.

[0013] Further, the rotor housing is of an annular structure, and the inner ring of the rotor housing is in interference fit with the circular ring.

[0014] Further, a stator cavity is provided inside the outer housing, the stator assembly is built in the stator cavity, and the stator cavity is potted with glue for insulating the stator assembly.

[0015] Further, annular rotor slots are provided on two outer sides of the outer housing, and the two rotor assemblies are respectively located inside the corresponding annular rotor slots, and the end faces of the rotor assemblies are flush with the opening end faces of the annular rotor slots.

[0016] Further, a plurality of diversion grooves for fluid to enter are provided on the inner side wall of the annular rotor slot

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. By integrating the axial flux motor and the shaftless blade structure, the present invention eliminates the traditional mechanical transmission shaft, significantly simplifies the overall structure. This design greatly reduces the volume of the device, facilitating miniaturization and integration, and is particularly suitable for application scenarios with strict space requirements, such as underwater robots, portable propulsion devices, etc.

[0019] 2. The traditional device has low energy transfer efficiency due to the existence of the mechanical transmission shaft, while the present invention adopts a shaftless design and directly drives the propeller to rotate through the axial flux motor, eliminating the energy loss in the mechanical transmission process. Experimental data shows that the energy transfer efficiency is improved compared with the traditional technology, significantly reducing energy consumption and operating costs.

[0020] 3. The traditional device faces a leakage risk due to the existence of multiple sealing parts. The present invention significantly improves the sealing performance by reducing the sealing parts and optimizing the sealing design. The shaftless structure reduces the sealing difficulty and wear risk, extends the service life of the device, and reduces the maintenance requirements caused by leakage.

[0021] 4. Due to the simplified structure, improved sealing performance and flexibility of the blade design, the maintenance difficulty and cost of the present invention are both significantly reduced. Users do not need to frequently replace seals or lubricate the transmission shaft, reducing downtime and maintenance costs, and improving the overall economic benefits of the device.. Description of the Drawings

[0022] Figure 1 is a front view structural diagram of the present application.

[0023] Figure 2 is a schematic internal sectional view of the present application.

[0024] Figure 3 is a structural diagram after the rotor assembly and the propeller are assembled.

[0025] Figure 4 is Figure 3 a sectional view in the

[0026] Figure 5 is a structural diagram of the propeller.

[0027] Figure 6 is a structural diagram of the outer housing.

[0028] Explanation of the reference numerals in the drawings: 1. Outer housing; 11. Stator cavity; 12. Annular rotor slot; 121. Flow guide groove; 13. Through hole; 2. Rotor assembly; 21. Permanent magnet; 3. Propeller; 31. Ring; 32. Blade; 4. Stator assembly. Detailed implementation manners

[0029] Please refer to Figures 1-6 as shown in the figure, the present invention relates to a shaftless blade 32 hydrodynamic device based on an axial flux motor, which includes an outer housing 1, a stator assembly 4, a rotor assembly 2 and a propeller 3. The stator assembly 4 is installed inside the outer housing 1. The outer housing 1 is provided with a through hole 13 extending along its axial direction. The propeller 3 is installed in the through hole 13. The two rotor assemblies 2 are located on both sides of the propeller 3 along its axial direction and are in contact with both sides of the propeller 3 in the axial direction.

[0030] The device realizes the rotation of the shaftless blade 32 through the electromagnetic driving principle of the axial flux motor, and then generates hydrodynamic force. Specifically, after the stator assembly 4 in the device is energized, an axial magnetic flux is generated, which interacts with the permanent magnets in the rotor assembly 2 to drive the rotation of the rotor assembly 2. Since the rotor assemblies 2 are located on both axial sides of the propeller 3 and are in contact with the propeller 3, the rotation of the rotor assemblies 2 directly drives the rotation of the propeller 3 without a traditional mechanical transmission shaft. When the propeller 3 rotates, its blades 32 interact with the fluid to generate a propulsive force or water flow, thereby realizing the output of hydrodynamic force.

[0031] Its beneficial effects are as follows: Firstly, by integrating the axial flux motor with the shaftless blade 32 structure, the traditional mechanical transmission shaft is eliminated, making the device structure more compact and facilitating miniaturization and integration. Secondly, due to the elimination of the mechanical transmission shaft, the energy loss during transmission is reduced, and the energy transmission efficiency is improved. At the same time, the axial flux motor itself features high power density and high efficiency, further enhancing the overall energy efficiency of the device. In addition, the shaftless structure reduces the number of sealing parts, lowers the sealing difficulty and wear risk, and improves the sealing performance and service life of the device. The device also provides multiple blade 32 design options, which can be selected according to different fluid conditions and application scenarios, showing strong adaptability. Finally, due to the compact structure and good sealing of the device, the difficulty of maintenance and upkeep is reduced, and the maintenance cost is lowered.

[0032] Further, the propeller 3 includes a ring 31 and blades 32, and the blades 32 and the ring 31 are of an integral structure or a detachable structure.

[0033] When the stator assembly 4 is powered on, an axial magnetic flux is generated. This axial magnetic flux interacts with the permanent magnets in the rotor assembly 2, thereby generating an electromagnetic force to drive the rotation of the rotor assembly 2. Since the rotor assembly 2 is located on both axial sides of the propeller 3 and abuts against the ring 31 part of the propeller 3, the rotation of the rotor assembly 2 directly drives the rotation of the propeller 3. When the propeller 3 rotates, its blades 32 interact with the fluid to generate a propulsive force or water flow. The integral or detachable structure design of the blades 32 and the ring 31 enables the propeller 3 to efficiently transmit power during rotation and select a suitable type of blade 32 according to needs to adapt to different fluid conditions.

[0034] For example, the integral structure design makes the blades 32 and the ring 31 an integral whole, reducing the number of components and improving the integrity and reliability of the structure. This design helps reduce the energy loss during transmission and improve the overall energy efficiency of the device. The detachable structure design enables the blades 32 to be conveniently detached from the ring 31, facilitating the replacement of damaged blades 32 or cleaning and maintenance. This reduces the maintenance cost and extends the service life of the device. Appropriate types of blades 32 (such as propeller 3 type, impeller type or guide type) can be selected according to different fluid conditions and application scenarios, improving the adaptability of the device. At the same time, the detachable structure design also facilitates the replacement of different specifications of blades 32 according to actual needs, increasing the flexibility of the device.

[0035] Furthermore, the rotor assembly 2 includes a rotor housing and a plurality of permanent magnets installed inside the rotor housing; the gap between the rotor housing and the permanent magnets is filled with a glue liquid for sealing the permanent magnets. In the rotor assembly 2, the permanent magnets are installed inside the rotor housing, and the gap between the rotor housing and the permanent magnets is filled with the glue liquid. The main function of this glue liquid is to fix the permanent magnets and prevent them from moving or loosening inside the rotor housing, thereby ensuring the stability and reliability of the rotor assembly 2 during rotation. At the same time, the sealing glue liquid can also effectively prevent external fluids (such as water or other working media) from entering the rotor housing, avoiding corrosion or performance degradation of the permanent magnets due to contact with the fluids.

[0036] Furthermore, the rotor housing is a ring structure, and the inner ring of the rotor housing is fitted with the ring 31 through a connecting member. Further, the rotor housing is a ring structure, and the inner ring of the rotor housing is in interference fit with the ring 31.

[0037] In this embodiment, in the shaftless blade 32 hydrodynamic device based on the axial flux motor, the connection between the rotor housing and the propeller 3 ring 31 is the key to ensuring efficient power transmission. Here are two connection schemes: Scheme one adopts the method of fitting with a connecting member. The rotor housing is designed as a ring structure, and its inner ring is tightly connected to the ring 31 of the propeller 3 through additional connecting members, such as bolts or pins. When the stator assembly 4 is powered on, the generated axial magnetic flux drives the rotor assembly 2 to rotate. The rotor housing rotates accordingly and transmits the rotational power to the ring 31 of the propeller 3 through the connecting member, thereby driving the entire propeller 3 to rotate. This connection method is reliable, can withstand large torques and axial forces, is easy to disassemble and install, and reduces the maintenance cost. In addition, it is also applicable to rotor housings and propeller 3 rings 31 made of different materials and sizes, with strong adaptability.

[0038] The second solution adopts the interference fit method. The rotor housing is also a ring structure, but there is a certain interference amount between its inner ring and the ring 31 of the propeller 3. Through methods such as press-fitting or hot fitting, a tight connection between the rotor housing and the ring 31 of the propeller 3 is achieved. When the stator assembly 4 is powered on, the rotor assembly 2 rotates. Due to the existence of the interference fit, the rotational power of the rotor housing can be directly transmitted to the ring 31 of the propeller 3, driving the entire propeller 3 to rotate. This method does not require additional connecting parts, has a compact structure, and is conducive to the miniaturization and integration of the device. At the same time, it provides good coaxiality, ensuring the precise alignment between the rotor housing and the ring 31 of the propeller 3, reducing vibration and noise. In addition, the interference fit can also withstand large torques and axial forces, is suitable for occasions where high power needs to be transmitted, and to a certain extent improves the sealing performance of the device. When selecting the connection solution, it can be considered according to specific requirements and scenarios. If frequent disassembly, maintenance, or replacement of components is required, or if there are high requirements for connection reliability, then the connecting part assembly solution may be more suitable. If extreme compactness, high load-bearing capacity, good centering, or high requirements for sealing performance are pursued, then the interference fit solution may be better.

[0039] Furthermore, a stator cavity 11 is provided inside the outer housing 1, the stator assembly 4 is built in the stator cavity 11, and the stator cavity 11 is potted with glue for insulating the stator assembly 4.

[0040] In the shaftless blade 32 hydrodynamic device based on the axial flux motor, a stator cavity 11 is provided inside the outer housing 1, the stator assembly 4 is built therein, and the stator cavity 11 is potted with glue for insulating the stator assembly 4. The stator cavity 11, as a key space inside the outer housing 1, its main function is to accommodate and fix the stator assembly 4. By placing the stator assembly 4 inside the stator cavity 11, the precise alignment between the stator assembly 4 and the outer housing 1 can be ensured, thereby optimizing the magnetic field distribution and improving the efficiency of the motor. In addition, the stator cavity 11 also provides a certain protection for the stator assembly 4, preventing it from being damaged by the external environment. The glue potted in the stator cavity 11 plays a certain role. First of all, the glue has good insulation performance, which can effectively isolate the stator assembly 4 from the external environment, preventing faults caused by electrical short circuits. This insulation performance is crucial for ensuring the safe operation of the device. Secondly, the glue may also provide additional structural support for the stator assembly 4. By potting the glue, the stator assembly 4 is firmly fixed inside the stator cavity 11, reducing the risk of loosening or damage caused by vibration or impact. This structural support helps to improve the stability and reliability of the device. In addition, the potted glue also helps with the heat dissipation of the stator assembly 4. The glue usually has a certain thermal conductivity, which can effectively conduct the heat generated by the stator assembly 4 to the outer housing 1, thereby reducing the temperature of the stator assembly 4 and improving the thermal stability of the device.

[0041] It should be noted that in the axial flux motor shaftless blade hydrodynamic device of another embodiment, the structural design can adopt an integrated solution without an independent stator cavity. Specifically, this embodiment omits the structural design of the traditional stator cavity 11 and instead adopts a die-embedded manufacturing process: First, the stator assembly 4 is directly placed into the cavity of a special mold, and then through the integral injection molding process of engineering plastics or composite materials, the molten material is molded along the outer contour of the stator assembly 4. The composite outer shell 1 formed by this process completely wraps the stator assembly 4. This integrated design eliminates the assembly gap between the positioning cavity and the stator in the traditional solution, resulting in a closer physical bond between the stator winding and the outer shell.

[0042] Compared with the split cavity structure, this solution optimizes the manufacturing process: First, the manufacturing cost is reduced by reducing the processing links of independent cavity components; Second, the self-aligning fixation of the stator assembly is achieved by using the curing shrinkage characteristics of the injection molding material; Third, the integral molding of the outer shell and the stator effectively improves the structural impact resistance.

[0043] Furthermore, the stator assembly 4 adopts a modular integrated design (not shown in the figure), and its core structure includes an annular stator base, a C-shaped stator core, surface-mounted permanent magnets 21, a concentrated stator winding, and an integrated sealing ring. Six trapezoidal grooves are evenly distributed along the circumference on the inner wall of the annular stator base, and each groove is embedded with a C-shaped stator core to form a magnetic circuit channel with an opening facing the rotor; The surface-mounted permanent magnets 21 are directly pasted on the outer side arm surface of the C-shaped core, and adjacent permanent magnets 21 have alternating N-S magnetization directions; The concentrated stator winding is wound around the inner side arm of the C-shaped core and forms a direct magnetic coupling with the rotor assembly 2; The annular stator sealing ring is seamlessly connected to the outer edge of the base through a laser welding process, and the inside is filled with a thermally conductive potting adhesive to form a fully enclosed waterproof structure.

[0044] This design shortens the magnetic circuit path through the integrated layout of the surface-mounted permanent magnets 21 and the C-shaped core, improving the magnetic flux utilization rate; A dual-channel heat dissipation system is constructed in cooperation with the internal potting adhesive, reducing the temperature rise; The modular pre-assembly process enables the stator assembly 4 to be assembled as an independent unit in the stator cavity 11 of the outer shell 1, simplifying the overall structure while ensuring the axial magnetic field coupling efficiency with the rotor assembly 2.

[0045] Furthermore, two annular rotor slots 12 are provided on the two outer sides of the outer shell 1, and the two rotor assemblies 2 are respectively located inside the corresponding annular rotor slots 12, and the end surface of the rotor assembly 2 is flush with the opening end surface of the annular rotor slot 12.

[0046] In the shaftless blade 32 hydrodynamic device based on an axial flux motor, annular rotor slots 12 are provided on two outer sides of the outer housing 1, and two rotor assemblies 2 are respectively located inside the corresponding annular rotor slots 12. The end face of the rotor assembly 2 is flush with the opening end face of the annular rotor slot 12. This design is mainly to further flatten the volume of the device.

[0047] Specifically, by providing the annular rotor slots 12 on both sides of the outer housing 1, the rotor assemblies 2 can be directly located in the outer housing 1. This "embedded" (here, the embedded specifically means that the rotor assembly 2 is slidably placed in the annular rotor slot 12, but not fixed in the annular rotor slot 12) design effectively reduces the overall thickness of the device, makes the size of the device more compact in the axial direction, and thus realizes the flattening of the volume. At the same time, the design that the end face of the rotor assembly 2 is flush with the opening end face of the annular rotor slot 12 also further ensures the neatness and beauty of the device appearance. This flush design not only reduces the air resistance or water flow resistance that may be generated during the operation of the device, but also helps to improve the overall performance and efficiency of the device.

[0048] Furthermore, several flow guiding grooves 121 for fluid to enter are provided on the inner side wall of the annular rotor slot 12.

[0049] One of the main functions of the flow guiding groove 121 is to guide the water flow into the tiny gap between the rotor assembly 2 and the annular rotor slot 12. When the rotor assembly 2 rotates driven by the stator assembly 4, the propeller 3 also rotates accordingly. Since the propeller 3 is assembled with the two rotor assemblies 2, and the rotor assembly 2 keeps the propeller 3 in a relatively stable position and does not tightly adhere to the inner wall of the through hole 13 under the magnetic force of the stator assembly 4, a certain gap is formed between the propeller 3 and the inner wall of the rotor slot. The water flow guided by the flow guiding groove 121 enters this gap, forming a thin water film, effectively reducing the direct contact area between the rotor assembly 2 and the inner side wall of the slot, and thus reducing friction and wear. This lubricating effect not only prolongs the service life of the rotor assembly 2 and the slot, but also improves the operation efficiency and stability of the device.

[0050] Secondly, the water flow guided by the flow guiding groove 121 also plays an important role in heat dissipation. During the rotation of the rotor assembly 2, due to electromagnetic effects and mechanical friction, certain heat is generated. If this heat is not dissipated in time, it may cause the temperature of the device to rise, affecting its performance and lifespan. The water flow guided by the flow guiding groove 121 can quickly carry away the heat and dissipate the heat to the surrounding environment through the flow of water, thereby keeping the device operating within an appropriate temperature range. The above embodiments are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An axisless blade hydrodynamic device based on an axial flux motor, characterized in that, It includes a housing, a stator assembly, a rotor assembly and a propeller. The stator assembly is installed inside the housing. The housing is provided with a through hole extending along its axial direction. The propeller is installed in the through hole. The two rotor assemblies are located on both sides of the propeller along its axial direction and are in contact with both sides of the axial direction of the propeller.

2. The shaftless blade hydrodynamic device based on an axial flux motor according to claim 1, wherein: The propeller includes a ring and blades. The blades and the ring are of an integrated structure or a detachable structure.

3. The shaftless blade hydrodynamic device based on an axial flux motor according to claim 2, characterized in that: The blades include propeller-type blades, impeller-type blades or guide-type blades.

4. The shaftless blade hydrodynamic device based on an axial flux motor according to claim 3, characterized in that: The rotor assembly includes a rotor housing and a plurality of permanent magnets installed inside the rotor housing. The gap between the rotor housing and the permanent magnets is filled with a glue for sealing the permanent magnets.

5. The shaftless blade hydrodynamic device based on an axial flux motor according to claim 4, wherein: The rotor housing is of a ring structure, and the inner ring of the rotor housing is assembled with the ring through a connecting piece.

6. The shaftless blade hydrodynamic device based on an axial flux motor according to claim 4, characterized in that: The rotor housing is of a ring structure, and the inner ring of the rotor housing is in interference fit with the ring.

7. The shaftless blade hydrodynamic device based on an axial flux motor according to claim 4, characterized in that: A stator cavity is provided inside the housing. The stator assembly is built in the stator cavity, and the stator cavity is potted with glue for insulating the stator assembly.

8. A shaftless blade hydrodynamic device based on an axial flux motor according to claim 7, characterized in that: Two annular rotor slot positions are provided on the two outer sides of the housing, and the two rotor assemblies are respectively located inside the corresponding annular rotor slot positions, and the end faces of the rotor assemblies are flush with the opening end faces of the annular rotor slot positions.

9. The shaftless blade hydrodynamic device based on an axial flux motor according to claim 8, wherein: Several flow guiding grooves for fluid to enter are provided on the inner side wall of the annular rotor slot position.

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