Shaftless underwater propeller

Abstract

The shaftless underwater propeller comprises an outer shell, an inner shell, a rotor and blades, the outer shell is a pipe body with a driving channel in the middle, a stator is arranged on the outer wall of the outer shell, the inner shell is installed in the driving channel in a pivoted mode, the inner shell is a pipe body with a fluid channel in the middle, and the rotor is matched with the stator and arranged on the inner wall of the pipe body. The blades extend from the inner wall of the pipe body to the axis. The underwater propeller is simple in structure and easy to assemble, the sealing performance of the stator is easier to achieve, compared with an existing product, the underwater propeller is substantially improved obviously, the stator is installed in the outer shell, no connecting gap exists between the inner shell and the outer shell, waterproof insulation of the stator is effectively guaranteed, and liquid is prevented from entering the underwater propeller; meanwhile, the outer shell and the inner shell are both in a long-strip-pipe shape, the contact area and the contact length are large, abrasion between the outer shell and the inner shell caused by fluid resistance can be effectively reduced, the rotation stability is improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of underwater propulsion, and in particular to a shaftless underwater propulsion. Background Technology

[0002] The underwater special propulsion motor is an electric propulsion device that incorporates fluid dynamics design, motor design, and material selection. Its novel and unique structure possesses superior characteristics, making it ideal for use as a propulsion system for underwater robots. It achieves motion of the vehicle through the rotation of the impeller and the reverse propulsion of the fluid, such as onboard skateboards, underwater robots, and submersibles (and can also be used for divers).

[0003] For example, Chinese patent CN202411129920.3 connects the hub motor to the propeller blades via a coupling, thereby achieving relative rotation. However, this structure has the following problems:

[0004] 1. Foreign objects can easily get caught on the blades, thus affecting the rotation of the motor;

[0005] 2. When foreign objects get caught on the blades, the torque resistance increases, which makes the shaft more prone to wear and thus affects the service life of the underwater thruster.

[0006] 3. Therefore, the structure is equipped with an underwater thruster shell to prevent foreign objects from entering, but this also requires intermittent cleaning or rinsing, making it rather inconvenient to use. Utility Model Content

[0007] The main purpose of this invention is to propose a shaftless underwater propulsion device, which aims to design an underwater propulsion device that does not require a central shaft, and whose blades are less likely to snag on foreign objects and whose rotation is more stable.

[0008] To achieve the above objectives, this utility model proposes a shaftless underwater propulsion device, comprising:

[0009] The outer casing is a tube with a drive channel in the middle, and the outer wall of the outer casing is provided with a stator;

[0010] The inner shell is pivotally mounted in the drive channel, and the inner shell is a tube with a fluid channel in the middle;

[0011] The rotor, which cooperates with the stator,

[0012] The blades are provided in multiples and are located on the inner wall of the tube body, extending from the inner wall of the tube body toward the axis.

[0013] In practical design, this underwater thruster has a simple structure and is relatively easy to assemble. Furthermore, achieving a tight seal on the stator is easier. Compared to existing products, its substantial improvements are quite significant.

[0014] By installing the stator inside the housing, with no gaps between the inner and outer housings, the stator's waterproof and insulating properties are effectively guaranteed, preventing liquid ingress.

[0015] Meanwhile, since both the outer and inner shells are elongated tubular shapes, they have a large contact area and contact length, which can effectively reduce wear between the outer and inner shells caused by fluid resistance, improve rotational stability, and extend service life.

[0016] Meanwhile, the blades extend directly from the inner shell, eliminating the need for external casings or other structures. This allows for fluid pressurization and guidance, and even foreign objects can be cleared by flowing in a predetermined direction under the influence of the fluid.

[0017] Even if a foreign object gets caught, the relatively long wheelbase between the inner and outer shells can effectively reduce the resistance caused by uneven rotor rotation and improve rotational stability. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the rotor;

[0019] Figure 2 This is a schematic diagram of the rotor in plan view;

[0020] Figure 3 Schematic diagram of rotor half section Figure 1 ;

[0021] Figure 4 Schematic diagram of rotor half section Figure 2 ;

[0022] Figure 5 Cross-section of underwater thruster Figure 1 ;

[0023] Figure 6 Cross-section of underwater thruster Figure 2 ;

[0024] Figure 7 Exploded view of an underwater thruster;

[0025] Figure 8 This is a three-dimensional schematic diagram of an underwater thruster.

[0026] In the picture,

[0027] 1 represents the outer casing, 10 represents the drive channel, and 11 represents the sealed chamber.

[0028] 2 represents the inner shell, and 20 represents the fluid channel.

[0029] 3 represents the blade, 30 represents the spacing, 31 represents the clearance area, 32 represents the curved edge, and 33 represents the connecting end.

[0030] 41 is the stator (magnetic induction coil), and 42 is the rotor (permanent magnet).

[0031] 51 is the fluid inlet end, and 52 is the fluid outlet end.

[0032] 6 represents the bearing, 61 represents the first stepped groove, and 62 represents the second stepped groove.

[0033] 7 is a through hole, 70 is a cable.

[0034] 8 represents the outer cover. Detailed Implementation

[0035] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0036] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0038] like Figures 1 to 8 As shown, a shaftless underwater thruster includes,

[0039] The outer casing 1 is a tube with a drive channel 10 in the middle, and the outer wall of the outer casing 1 is provided with a stator 41;

[0040] Inner shell 2, which is pivotally mounted in drive channel 10, and the inner shell 2 is a tube with a fluid channel 20 in the middle;

[0041] Rotor 42, which cooperates with stator 41,

[0042] The blade 3 is provided in multiples and is located on the inner wall of the tube body. The blade 3 extends from the inner wall of the tube body toward the axis.

[0043] In practical design, this underwater thruster has a simple structure and is relatively easy to assemble. Furthermore, achieving a tight seal for the stator 41 is easier. Compared to existing products, its substantial improvements are quite significant.

[0044] By installing the stator 41 inside the outer casing 1, and ensuring there are no gaps between the inner casing 2 and the outer casing 1, the waterproof insulation of the stator 41 is effectively guaranteed, preventing liquid from entering.

[0045] Meanwhile, both the outer shell 1 and the inner shell 2 are elongated tubular shapes, resulting in a large contact area and contact length. This effectively reduces wear between the outer shell 1 and the inner shell 2 caused by fluid resistance, improving rotational stability and service life.

[0046] Meanwhile, blade 3 extends directly from the inner shell 2, thus eliminating the need for an outer casing or other structures, enabling fluid pressurization and guidance. Even if foreign objects are present, they can be cleared by flowing in a predetermined direction under the action of the fluid.

[0047] Even if a foreign object gets caught, the relatively long wheelbase between the inner shell 2 and the outer shell 1 can effectively reduce the resistance caused by uneven rotation of the rotor 42 and improve the stability of rotation.

[0048] This product can be applied to structures such as skateboards, submersibles, robots, and wave pumps.

[0049] Specifically, the stator 41 is a magnetic induction coil, the rotor 42 is a permanent magnet, there are multiple permanent magnets, and they are distributed at intervals along the outer peripheral wall of the inner shell 2. The permanent magnets are integrally formed with the inner shell 2, and the cross-section of the magnetic induction coil is circular.

[0050] In this embodiment of the utility model, the outer shell 1 is provided with circumferentially distributed sealed chambers 11, the stator 41 is disposed in the sealed chamber 11, the cross-section of the sealed chamber is annular, wherein the stator 41 and the rotor 42 are magnetically tangent, thereby driving the blades 3 to rotate, and the annular shape of the sealed chamber facilitates the installation of the rotor 42.

[0051] Specifically, the outer shell 1 and the stator 41 are integrally injection molded or embedded in the shell. The outer shell 1 is provided with a through hole 7, and a waterproof cable 70 is provided in the through hole 7. The waterproof cable 70 extends into the sealed cavity 11 and connects to the stator 41. In actual design, the stator 41 can be integrally injection molded or an installation structure can be adopted. After installation, waterproof glue is filled to ensure the safety of power supply. Meanwhile, the design of the waterproof cable is a conventional design and will not be described in detail here.

[0052] In this embodiment of the present invention, a bearing 6 is provided between the outer wall of the inner shell 2 and the drive channel 10, and the inner shell 2 rotates relative to the outer shell 1 through the bearing 6.

[0053] Specifically, there are two bearings 6. The inner shell 2 has a first stepped groove 61 at both ends, and the outer shell 1 has a second stepped groove 62 at both ends that cooperates with the first stepped groove 61. The bearing 6 is located between the first stepped groove 61 and the second stepped groove 62.

[0054] Specifically, the outer ends of the first stepped groove 61 and the second stepped groove 62 are also provided with an outer cover 8. The end face of the outer cover 8 is rounded and chamfered, thereby reducing water flow resistance and preventing foreign objects from getting caught.

[0055] Specifically, the bearing 6 is made of Teflon material or ceramic material, which effectively reduces the relative coefficient of friction between the inner shell 2 and the outer shell 1, while also having good corrosion resistance.

[0056] In this embodiment of the utility model, the adjacent blades 3 are provided with a spacing 30 along the radial cross-section direction. The spacing 30 between adjacent blades 3 can provide a larger range for fluid output, thereby effectively hooking foreign objects on the wall onto the blades 3. The permanent magnet consists of S-pole magnets and N-pole magnets distributed adjacently.

[0057] Specifically, the adjacent blades 3 are spaced 30 apart along the radial cross-section, which allows for a larger range of fluid output, thereby effectively hooking foreign objects on the wall onto the blades 3.

[0058] Multiple blades 3 have a clearance zone 31 at their ends away from the inner shell 2. The clearance zone 31 can generate a predetermined fluid pressure, thereby forming a vortex at the location of the clearance zone 31 and increasing the fluid pressure.

[0059] The blade 3 is arc-shaped and extends with a curved surface; the blade 3 includes two arc-shaped edges 32, which simplifies the manufacturing process and allows for a higher fluid flow rate.

[0060] The end of the arc-shaped edge 32 is a wedge-shaped surface and / or a vertical surface. In the actual design, there are four blades 3. One blade 3 can be wedge-shaped on both sides, and another blade 3 can be wedge-shaped and vertical, thus satisfying the flow of fluid. The wedge-shaped surface can be an arc-shaped chamfer, thereby reducing the snagging of foreign objects while increasing the fluid pressure.

[0061] A connecting end 33 is provided between the two arc-shaped edges 32. The connecting end 33 is an arc-shaped chamfer or a vertical surface, which forms an empty space 31 while improving the structural strength of the blade 3, preventing deformation of its material, and reducing the snagging of foreign objects. The permanent magnet and the inner shell 2 are integrally injection molded or the permanent magnet is bonded to the inner shell 2. The integral injection molding structure is the most stable and can also ensure the sealing of the permanent magnet and prevent rusting.

[0062] The bonding method can be either adhesive tape or filler glue.

[0063] The inner shell 2 is elongated, and the fluid channel 20 includes a fluid inlet end 51 and a fluid outlet end 52. The blade 3 is located near the fluid outlet end 52. The inner shell 2 near the fluid inlet end 51 is a hollow cavity. When the blade 3 rotates, it can form a vortex in the hollow cavity, thereby driving the fluid in the space to flow.

[0064] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A shaftless underwater thruster, characterized in that, include, The outer casing is a tube with a drive channel in the middle, and the outer wall of the outer casing is provided with a stator; The inner shell is pivotally mounted in the drive channel, and the inner shell is a tube with a fluid channel in the middle; Rotor, which is coupled with stator; The blades are provided in multiples and are located on the inner wall of the tube body, extending from the inner wall of the tube body toward the axis.

2. The shaftless underwater thruster as described in claim 1, characterized in that: The stator is a magnetic induction coil, the rotor is a permanent magnet, and there are multiple permanent magnets that are spaced apart along the outer peripheral wall of the inner shell. The permanent magnets are integrally formed with the inner shell, and the cross-section of the magnetic induction coil is circular.

3. The shaftless underwater thruster as described in claim 1, characterized in that: The outer casing has circumferentially distributed sealed chambers, and the stator is disposed in the sealed chambers. The cross-section of the sealed chambers is annular.

4. The shaftless underwater thruster as described in claim 3, characterized in that: The outer shell and the stator are integrally injection molded or embedded in each other. The outer shell has a through hole, and a waterproof cable is installed in the through hole. The waterproof cable extends into the sealed cavity and is connected to the stator.

5. The shaftless underwater propulsion device as described in claim 3, characterized in that: A bearing is provided between the outer wall of the inner shell and the drive channel, and the inner shell rotates relative to the outer shell through the bearing.

6. The shaftless underwater thruster as described in claim 5, characterized in that: The bearing is provided in two parts. The inner shell has a first stepped groove at both ends, and the outer shell has a second stepped groove at both ends that mates with the first stepped groove. The bearing is located between the first stepped groove and the second stepped groove.

7. The shaftless underwater thruster as described in claim 6, characterized in that: The outer ends of the first and second stepped grooves are also provided with outer covers, and the end face of the outer covers is rounded and chamfered.

8. The shaftless underwater propulsion device as described in claim 5, characterized in that: The bearing is made of Teflon material or ceramic material.

9. The shaftless underwater thruster as described in claim 1, characterized in that: There is a spacing between adjacent blades along the radial cross-section.

10. The shaftless underwater thruster as described in claim 1, characterized in that: There is a spacing between adjacent blades along the radial cross-section; Multiple blades have air-retaining sections at their ends furthest from the inner shell; The blade is arc-shaped and extends with a curved surface; the blade includes two arc-shaped edges; The ends of the curved edge are wedge-shaped surfaces and / or vertical surfaces.

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