Shaftless blade fluid power device based on axial flux motor

Abstract

The utility model relates to the field of fluid power devices, in particular to a shaftless paddle fluid power device based on an axial magnetic 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 utility model relates to fluid power device field especially a kind of shaftless paddle fluid power device based on axial flux motor. BACKGROUND

[0002] In the field of fluid power device, the traditional technical scheme usually relies on complex mechanical transmission shaft system to realize power transmission, and this design has multiple technical defects:

[0003] 1. The traditional device often contains lengthy mechanical transmission shaft and multiple connecting components, resulting in complex overall structure and large volume, making it difficult to realize miniaturization and integration design, limiting its application in compact space or portable equipment.

[0004] 2. Mechanical transmission shaft will produce significant energy loss in the process of power transmission, such as friction loss, vibration loss, etc., resulting in reduced overall energy transmission efficiency, increased energy consumption and operating cost.

[0005] 3. The traditional device usually contains multiple sealing parts, such as transmission shaft wall sealing, bearing sealing, etc., which are prone to leakage due to wear, aging or improper installation, reducing the sealing performance and reliability of the device.

[0006] 4. Due to complex structure and poor sealing performance, the traditional device needs frequent maintenance and maintenance, such as replacing seals, lubricating transmission shaft, etc., increasing maintenance cost. At the same time, the wear and corrosion of mechanical parts also shorten the service life of the device. INVENTION CONTENTS

[0007] To solve the above problems, the utility model provides a kind of shaftless paddle fluid power device based on axial flux motor. It realizes compact structure, energy transmission efficiency improvement, sealing performance improvement, strong adaptability and maintenance cost reduction and other multiple beneficial effects.

[0008] To achieve the above purpose, the utility model adopts the technical scheme: a kind of shaftless paddle fluid power device based on axial flux motor, including outer shell, stator assembly, rotor assembly and propeller, the stator assembly is installed in the inside of the outer shell, the outer shell is opened with the through hole extending along its axial direction, the propeller is installed in the through hole, the two rotor assemblies are located on the two sides of the propeller along its axial direction and abuts with the two sides of the propeller axial direction.

[0009] Further, the propeller includes a circular ring and a paddle, and the paddle and the circular ring are integrated or detachable.

[0010] Further, the paddle includes a propeller-type paddle, an impeller-type paddle or a guide-type paddle.

[0011] Further, the rotor assembly comprises a rotor shell and a plurality of permanent magnets mounted inside the rotor shell; a gap between the rotor shell and the permanent magnets is filled with glue liquid sealing the permanent magnets.

[0012] Further, the rotor shell is a ring structure, wherein an inner ring of the rotor shell is fitted with a circular ring through a connecting piece.

[0013] Further, the rotor shell is a ring structure, wherein an inner ring of the rotor shell is fitted with a circular ring through interference fit.

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

[0015] Further, two outer sides of the outer shell are provided with annular rotor slots, 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, the inner side wall of the annular rotor slot is provided with a plurality of guide grooves for fluid entering

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

[0018] 1. By integrating the axial flux motor and the shaftless propeller structure, the present application eliminates the traditional mechanical transmission shaft, significantly simplifying the overall structure. This design significantly reduces the size of the device, facilitating miniaturization and integration, and is particularly suitable for applications with strict space requirements, such as underwater robots, portable propulsion equipment, etc.

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

[0020] 3. The traditional device faces the risk of leakage due to the presence of multiple sealing parts, while the present application significantly improves the sealing performance by reducing the number of sealing parts and optimizing the sealing design. The shaftless structure reduces the sealing difficulty and wear risk, prolongs the service life of the device, and reduces the maintenance needs caused by leakage.

[0021] 4. Due to the simplified structure, improved sealing performance, and flexibility of the propeller design, the maintenance difficulty and cost of the present application are greatly reduced. Users do not need to frequently replace sealing parts or lubricate the transmission shaft, reducing downtime and maintenance costs, and improving the overall economic efficiency of the device. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the schematic diagram of the front structure of the application.

[0023] Figure 2 is the schematic diagram of the internal cross-section structure of the application.

[0024] Figure 3 is the schematic diagram of the structure of the rotor assembly and the propeller after being assembled.

[0025] Figure 4 is the schematic diagram of the cross-section structure of the application in the state of being assembled. Figure 3 is the schematic diagram of the cross-section structure of the application in the state of being assembled.

[0026] Figure 5 is the schematic diagram of the structure of the propeller.

[0027] Figure 6 is the schematic diagram of the structure of the outer shell.

[0028] Brief Description of the Drawings: 1, outer shell; 11, stator cavity; 12, annular rotor slot; 121, flow guide groove; 13, through hole; 2, rotor assembly; 21, permanent magnet; 3, propeller; 31, circular ring; 32, blade; 4, stator assembly. DETAILED DESCRIPTION

[0029] Referring to Figures 1-6 the utility model discloses a kind of shaftless propeller 32 fluid power devices based on axial flux motor, including outer shell 1, stator assembly 4, rotor assembly 2 and propeller 3, the stator assembly 4 is installed in the inside of the outer shell 1, the outer shell 1 is provided with the through hole 13 extending along its axial direction, the propeller 3 is installed in this through hole 13, the two rotor assemblies 2 are located at the two sides of the propeller 3 along its axial direction and with the two sides of the propeller 3 axial direction abut.

[0030] The device realizes the rotation of shaftless propeller 32 by the electromagnetic drive principle of axial flux motor, and then generates fluid power. Specifically, the stator assembly 4 in the device generates axial flux after being electrified, interacts with the permanent magnet in the rotor assembly 2, and drives the rotor assembly 2 to rotate. Since the rotor assembly 2 is located at the axial two sides of the propeller 3 and abuts with the propeller 3, the rotation of the rotor assembly 2 directly drives the propeller 3 to rotate, without the need for traditional mechanical transmission shaft. When the propeller 3 rotates, its blade 32 interacts with fluid, generates propulsion or water flow, thereby realizing the output of fluid power.

[0031] The beneficial effects are: first, by integrating the axial flux motor and the shaftless blade 32 structure, the traditional mechanical transmission shaft is eliminated, making the device structure more compact, facilitating miniaturization and integration. Second, since the mechanical transmission shaft is eliminated, the energy loss in the transmission process is reduced, and the energy transmission efficiency is improved. At the same time, the axial flux motor itself has the characteristics of high power density and high efficiency, further improving the overall energy efficiency of the device. In addition, the shaftless structure reduces the number of sealing parts, reduces 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 working conditions and application scenarios, with strong adaptability. Finally, due to the compact structure and good sealing performance of the device, the maintenance and maintenance difficulty is reduced, and the maintenance cost is reduced.

[0032] Further, the propeller 3 includes a circular ring 31 and a blade 32, which is an integrated structure or a detachable structure with the circular ring 31.

[0033] When the stator assembly 4 is powered on, an axial flux is generated, which interacts with the permanent magnet in the rotor assembly 2, thereby generating an electromagnetic force to drive the rotor assembly 2 to rotate. Since the rotor assembly 2 is located on both sides of the propeller 3 in the axial direction and partially abuts the circular ring 31 of the propeller 3, the rotation of the rotor assembly 2 will directly drive the propeller 3 to rotate. When the propeller 3 rotates, its blade 32 interacts with the fluid to generate a propelling force or water flow. The integrated or detachable structure design of the blade 32 and the circular ring 31 enables the propeller 3 to efficiently transmit power during rotation, and the appropriate blade 32 type can be selected to adapt to different fluid working conditions.

[0034] For example, the integrated structure design makes the blade 32 and the circular ring 31 an integral whole, reducing the number of components and improving the overall structure and reliability. This design helps to reduce energy loss during transmission and improve the overall energy efficiency of the device. The detachable structure design allows the blade 32 to be easily detached from the circular ring 31, facilitating the replacement of damaged blades 32 or cleaning and maintenance. This reduces maintenance costs and extends the service life of the device. Different blade 32 types (such as propeller 3, impeller, or guide type) can be selected according to different fluid working 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] Further, the rotor assembly 2 comprises 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 sealing glue that seals 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 a sealing glue. The main function of this glue 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 can effectively prevent external fluids (such as water or other working media) from entering the inside of the rotor housing, avoiding corrosion or performance degradation of the permanent magnets due to contact with fluids.

[0036] Further, the rotor housing is a ring structure, wherein the inner circle of the rotor housing is fitted with the circular ring 31 through a connecting piece. Further, the rotor housing is a ring structure, wherein the inner circle of the rotor housing is interference-fitted with the circular ring 31.

[0037] In this embodiment, in the shaftless propeller 32 fluid power device based on axial flux motor, the connection between the rotor housing and the circular ring 31 of the propeller 3 is the key to ensure efficient power transmission. Here are two connection schemes: Scheme one uses the fitting method of connecting piece. The rotor housing is designed as a ring structure, and its inner circle is tightly connected with the circular ring 31 of the propeller 3 through additional connecting pieces such as bolts or pins. When the stator assembly 4 is energized, the generated axial flux drives the rotor assembly 2 to rotate, and the rotor housing rotates with it, and transmits the rotary power to the circular ring 31 of the propeller 3 through the connecting piece, and then drives the whole propeller 3 to rotate. This way of connection is reliable, can withstand large torque and axial force, and is easy to disassemble and install, reducing maintenance costs. In addition, it is also suitable for rotor housings and propeller 3 circular rings 31 of different materials and sizes, and has strong adaptability.

[0038] Scheme two adopts the way of interference fit. The rotor shell is also a ring structure, but there is a certain interference between the inner ring and the circular ring 31 of the propeller 3. Through pressure or hot installation, etc., the tight connection between the rotor shell and the circular ring 31 of the propeller 3 is realized. When the stator assembly 4 is energized, the rotor assembly 2 rotates, and due to the existence of interference fit, the rotating power of the rotor shell can be directly transmitted to the circular ring 31 of the propeller 3, driving the entire propeller 3 to rotate. This way does not need additional connecting parts, the structure is compact, which is conducive to the miniaturization and integration of the device. At the same time, it provides good coaxiality, ensuring the accurate centering between the rotor shell and the circular ring 31 of the propeller 3, reducing vibration and noise. In addition, the interference fit can also withstand larger torque and axial force, suitable for occasions that need to transmit large power, and to some extent, it improves the sealing performance of the device. When choosing the connection scheme, specific needs and scenarios can be considered. If frequent disassembly, maintenance or replacement of parts are required, or there are higher requirements for connection reliability, then the connecting part assembly scheme may be more suitable. If the ultimate compactness, high bearing capacity and good centering are pursued, or the sealing performance is required, then the interference fit scheme may be more optimal.

[0039] Further, the outer shell 1 is internally provided with a stator cavity 11, the stator assembly 4 is built in the stator cavity 11, and the stator cavity 11 is filled with glue for insulating the stator assembly 4.

[0040] In the shaftless propeller 32 fluid power device based on axial flux motor, the outer shell 1 is internally provided with a stator cavity 11, the stator assembly 4 is built in the stator cavity 11, and the stator cavity 11 is filled with glue for insulating the stator assembly 4. The stator cavity 11 is a key space inside the outer shell 1, and its main function is to accommodate and fix the stator assembly 4. By placing the stator assembly 4 in the stator cavity 11, the accurate centering between the stator assembly 4 and the outer shell 1 can be ensured, thereby optimizing the distribution of the magnetic field and improving the efficiency of the motor. In addition, the stator cavity 11 also provides certain protection for the stator assembly 4, preventing it from being damaged by the external environment. The glue filled in the stator cavity 11 also 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 circuit. This insulation performance is crucial to ensure the safe operation of the device. Secondly, the glue may also provide additional structural support for the stator assembly 4. By filling the glue, the stator assembly 4 is firmly fixed in 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, filling the glue also helps to dissipate heat from 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 shell 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 another embodiment of the axial flux motor shaftless paddle hydrodynamic device, the structural design can adopt an integrated scheme without independent stator cavity. Specifically, this embodiment eliminates the structural design of the traditional stator cavity 11, and instead adopts a mold embedding manufacturing process: first, the stator assembly 4 is directly placed in the cavity of a special mold, and then through the one-piece injection molding process of engineering plastics or composite materials, the molten material is wrapped around 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 scheme, making the stator winding and the outer shell more closely physically combined.

[0042] Compared with the split cavity structure, this scheme optimizes the manufacturing process: first, it reduces the manufacturing cost by reducing the processing steps of independent cavity components; second, it uses the shrinkage characteristics of the injection molding material to achieve self-centering fixation of the stator assembly; third, the overall molding of the outer shell and the stator effectively improves the structural impact resistance.

[0043] Further, the stator assembly 4 adopts a modular integrated design (not shown in the figure), which includes a ring-shaped stator base, a C-shaped stator core, surface-mounted permanent magnets 21, a concentrated stator winding, and an integrated sealing ring. The inner wall of the ring-shaped stator base is evenly distributed with six trapezoidal grooves along the circumference, and each groove is embedded with a C-shaped stator core, forming a magnetic circuit channel with the rotor facing the opening; the surface of the outer side of the C-shaped core is directly pasted with surface-mounted permanent magnets 21, and adjacent permanent magnets 21 are magnetized in N-S alternating direction; the concentrated stator winding is wound on the inner side of the C-shaped core, forming a direct magnetic coupling with the rotor assembly 2; the ring-shaped stator sealing ring is seamlessly connected with the outer edge of the base through laser welding process, and the inside is filled with heat-conducting potting glue, forming a fully enclosed waterproof structure.

[0044] This design shortens the magnetic path by integrating the surface-mounted permanent magnets 21 and the C-shaped core, and improves the magnetic flux utilization rate; it also builds a double-channel heat dissipation system with the internal potting glue, reducing the temperature rise; the modular pre-assembly process allows 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] Further, the two outer sides of the outer shell 1 are provided with annular rotor slots 12, and the two rotor assemblies 2 are respectively located inside the corresponding annular rotor slots 12, and the end face of the rotor assembly 2 is flush with the opening end face of the annular rotor slot 12.

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

[0047] Specifically, by arranging the annular rotor slot positions 12 on both sides of the outer housing 1, the rotor assemblies 2 can be directly located in the outer housing 1. This "embedded" design (here, embedded specifically refers to the rotor assembly 2 being slidably placed in the annular rotor slot position 12, but not fixed in the annular rotor slot position 12) effectively reduces the overall thickness of the device, making the device more compact in the axial direction, thereby achieving volume flattening. At the same time, the design of the end face of the rotor assembly 2 flush with the opening end face of the annular rotor slot position 12 further ensures the neatness and beauty of the appearance of the device. 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] Further, the inner side wall of the annular rotor slot position 12 is provided with a plurality of fluid guide grooves 121 for fluid entry.

[0049] One of the main functions of the fluid guide groove 121 is to guide the water flow into the small gap between the rotor assembly 2 and the annular rotor slot position 12. When the rotor assembly 2 rotates under the drive of the stator assembly 4, the propeller 3 also rotates. Since the propeller 3 is fitted with the two rotor assemblies 2, and the rotor assembly 2 is under the magnetic force of the stator assembly 4, the propeller 3 is kept in a relatively stable position and does not tightly contact the inner wall of the through hole 13, thus forming a certain gap between the propeller 3 and the inner wall of the rotor slot. The water flow guided by the fluid guide groove 121 enters this gap, forming a thin layer of water film, effectively reducing the direct contact area between the rotor assembly 2 and the inner wall of the slot, thereby 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 operating efficiency and stability of the device.

[0050] Secondly, the water flow guided by the flow guide groove 121 also plays an important role in heat dissipation. During the rotation of the rotor assembly 2, certain heat will be generated due to electromagnetic effect and mechanical friction. If the heat is not dissipated in time, it may cause the temperature of the device to rise, affecting its performance and service life. The water flow guided by the flow guide groove 121 can quickly take away the heat and dissipate it to the surrounding environment through the flow of water, thereby keeping the device running within a suitable temperature range. The above embodiments only describe the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by ordinary engineering technicians in the field shall fall within the protection scope determined by the claims of the present application.

Claims

1. A shaftless propeller hydrodynamic device based on an axial flux motor, characterized in that, The device includes a housing, a stator assembly, a rotor assembly, and a propeller. The stator assembly is installed inside the housing. The housing has 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 abut against both sides of the propeller along its axial direction.

2. The shaftless propeller hydrodynamic device based on an axial flux motor according to claim 1, characterized in that: The propeller includes a ring and blades, wherein the blades and the ring are either an integral structure or a detachable structure.

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

4. A shaftless propeller 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 an adhesive to seal the permanent magnets.

5. A shaftless propeller hydrodynamic device based on an axial flux motor according to claim 4, characterized in that: The rotor housing has a ring-shaped structure, and the inner ring of the rotor housing is fitted to the circular ring through a connector.

6. A shaftless propeller hydrodynamic device based on an axial flux motor according to claim 4, characterized in that: The rotor housing has a ring-shaped structure, with the inner ring of the rotor housing having an interference fit with the circular ring.

7. A shaftless propeller hydrodynamic device based on an axial flux motor according to claim 4, characterized in that: The outer casing contains a stator cavity, in which the stator assembly is housed, and the stator cavity is filled with adhesive for insulating the stator assembly.

8. A shaftless propeller hydrodynamic device based on an axial flux motor according to claim 7, characterized in that: The outer shell has two annular rotor slots on its two outer sides, and the two rotor assemblies are located inside the corresponding annular rotor slots, with the end face of the rotor assembly flush with the opening end face of the annular rotor slot.

9. A shaftless propeller hydrodynamic device based on an axial flux motor according to claim 8, characterized in that: The inner wall of the annular rotor slot is provided with several guide channels for fluid to enter.

Images