CN220054114U - Double-deck screw propeller - Google Patents

Abstract

The utility model belongs to the technical field of propellers, and particularly relates to a double-layer propeller which comprises an outer shell, an axial flux motor and two propellers, wherein the outer shell is arranged on the outer side of the axial flux motor, and the propellers are arranged on two sides of the axial flux motor in the axial direction. The axial flux motor comprises a stator assembly and two rotor assemblies, wherein the rotor assemblies are arranged in a propeller, the rotor assemblies are arranged on two sides of the stator assembly along the axial direction of the stator assembly, the two rotor assemblies are opposite in steering, and the propeller is a positive and negative blade; the propeller further comprises a shafting assembly, and the stator assembly and the rotor assembly are detachably connected through the shafting assembly. The rotor component and part of the stator component are made of the polymer water lubrication bearing material, and the material has good lubrication and wear resistance, good corrosion resistance, simplifies the structure of the propeller and saves the cost.

Description

Double-deck screw propeller

Technical Field

The utility model belongs to the technical field of propellers, and particularly relates to a double-layer propeller.

Background

In order to improve the propulsion efficiency of the propeller, the conventional shaft-driven propeller has been developed to rotate the propeller in opposite directions at constant or non-constant speed by mounting two common propellers on two concentric shafts, respectively.

Thus, the existing double-or multi-layer propeller has a complex structure, which results in a series of problems: (1) In order to realize the function of the double-layer or multi-layer propeller, two or more groups of stator assemblies and rotor assemblies are required to be stacked to realize the technical effect of contra-rotation, so that the cost of materials is increased; (2) The stator component and the rotor component are arranged in the shell, so that the volume of the stator component and the rotor component is overlarge; (3) The tail wire outlet structure is complicated, and a plurality of wire outlets are required to be arranged; (4) The stator component and the rotor component adopt a bearing structure to realize transmission, so that the problem of abrasion and corrosion exists.

Disclosure of Invention

The utility model aims to provide a double-layer propeller so as to solve the problems of high material cost, large volume, complicated assembly of a wire outlet structure and abrasion and corrosion of bearing transmission of the existing propeller.

The embodiment of the utility model can be realized by the following technical scheme:

the utility model provides a double-deck screw propeller, includes shell body, axial magnetic flux motor, two screw, the shell body install in the outside of axial magnetic flux motor, the screw install in axial magnetic flux motor axial direction's both sides.

The axial flux motor comprises a stator assembly and two rotor assemblies, wherein the rotor assemblies are installed inside the propellers, the rotor assemblies are installed on two sides of the stator assembly along the axial direction of the stator assembly, the two rotor assemblies are opposite in steering, and the two propellers are positive and negative paddles.

Preferably, the propeller further comprises a shafting assembly penetrating through the stator assembly and the rotor assembly and detachably connected with the propeller, the shafting assembly is in interference fit with the stator assembly and detachably connected with the rotor assembly, and the rotor assembly can rotate circumferentially in synchronization with the stator assembly and the shafting assembly.

Further, each rotor assembly comprises a rotor fixing piece and a permanent magnet, wherein the interior of the rotor fixing piece is of a cavity structure matched with the permanent magnet, and the permanent magnet is arranged in the interior of the rotor fixing piece;

the rotor fixing piece comprises a rotor shell and a rotor shell cover, the rotor shell is of a cylindrical structure with one end closed, and the rotor shell cover is detachably connected with the free end of the rotor shell;

the polarities of the permanent magnets of the two rotor assemblies are opposite;

the rotor fixing piece is made of a high polymer water lubrication bearing material.

Further, the rotor fixing piece further comprises a radial limiting part, the radial limiting part and the rotor shell are coaxially arranged, one end of the radial limiting part is fixedly connected with the closed end of the rotor shell, and the other end of the radial limiting part sequentially penetrates through the permanent magnet, the rotor shell cover and the propeller to be detachably connected.

Preferably, the propeller further comprises a guide cover corresponding to the propeller, and the guide cover is detachably connected to one side of the propeller away from the axial flux motor;

the air guide sleeve is abutted with the propeller.

Further, the stator assembly comprises a stator core and a stator coil, wherein the two side end surfaces of the stator core along the axial direction of the stator core are in a bilateral convex symmetrical structure;

the stator core comprises a supporting part and a plurality of first protruding parts, the supporting part is of a circular ring structure, the plurality of first protruding parts are located between an outer ring and an inner ring of the stator core and are evenly distributed along the radial extension and the circumferential direction of the first protruding parts, and the stator coil is evenly wound on the first protruding parts.

Further, the propeller further comprises a rotor check ring, wherein the rotor check ring is located on one side, close to the stator assembly, of the propeller, and the rotor check ring is matched with the propeller to achieve axial limiting of the rotor assembly.

Further, the shafting assembly comprises a central shaft and two shaft check rings, wherein the central shaft penetrates through the stator core, the rotor check ring, the rotor assembly and the propeller and is clamped with the shaft check rings;

the central shaft is of a cylindrical structure, and an annular groove matched with the check ring for the shaft is formed in the periphery of the central shaft;

the central shaft with stator module interference fit, the central shaft periphery is protruding to be equipped with two annular protruding, and annular protruding is located stator core is along its axial direction's both sides, and every annular protruding along its axial direction's two terminal surfaces respectively with the retaining ring for the rotor stator core butt.

Further, the stator core further comprises a shaft sleeve positioned at the shaft center of the stator core, and the inner periphery of the shaft sleeve is directly abutted to the outer periphery of the central shaft and in interference fit with the outer periphery of the central shaft.

Further, the outer shell comprises a shell, a containing part and a plurality of spokes, the rotor assembly is installed in the containing part, and the spokes are positioned between the shell and the containing part and fixedly connected with the shell and the containing part;

the accommodating part is of a cylindrical structure and is coaxially arranged with the rotor assembly, and the spokes extend along the radial direction of the accommodating part and are uniformly distributed in the circumferential direction;

the accommodating part is encapsulated by epoxy resin.

Further, the outer shell further comprises a driving circuit board, a square shell and an outgoing line limiting sleeve, wherein the square shell is convexly arranged on the outer wall of the outer shell, the driving circuit board is arranged in the square shell, the outgoing line limiting sleeve and the square shell form a through channel, and an external plug wire can enter the square shell from the outgoing line limiting sleeve and is electrically connected with the driving circuit board;

grooves are formed in one spoke, and the lines of the stator coil uniformly extend into the square shell through the grooves and are welded with the driving circuit board;

and the groove and the square shell are encapsulated by epoxy resin.

Further, the propeller is of a cylindrical structure with one end closed, and comprises a circular ring and blades, wherein the blades are connected to the outer side of the circular ring, and the rotor assembly is arranged in the circular ring;

the closed end of screw is located and keeps away from one side of stator module, sets up on this closed end and follows the spline-like through-hole that screw axial direction runs through, rotor module is through spline-like connected mode to screw transmission circumference rotatory trend.

The double-layer propeller provided by the embodiment of the utility model has at least the following beneficial effects:

(1) The rotor fixing piece is made of the high polymer water lubrication bearing material, on one hand, the material has good lubrication and wear resistance, so that the structure such as a bearing is not needed between the central shaft and the radial limiting part, the structure of the propeller is further simplified, and the whole structure of the propeller is simpler and more compact; on the other hand, the material has good corrosion resistance, so that the propeller still has good application prospect in the marine environment, and a sealing structure is not required to be designed to independently protect the rotor fixing piece, thereby saving the cost and further reducing the volume of the propeller.

(2) The shaft sleeve is made of the polymer water lubrication bearing material, and the material has good lubrication and wear resistance, so that the shaft sleeve can replace various traditional rolling bearings, and the shaft sleeve and a central shaft do not need to have the structure of bearings and the like, the size of the propeller is simplified, and the overall structure of the propeller is simpler and more compact; on the other hand, the material has good corrosion resistance, so that the propeller still has good application prospect in the marine environment, and the shaft sleeve is not required to be independently protected by a sealing structure, so that the cost can be saved, and the volume of the propeller can be further reduced.

(3) The utility model provides a double-layer propeller with a single stator and double rotors, on one hand, the propeller does not need to use two groups of stator components to drive two groups of rotor components to realize contra-rotation, and the cost of materials is reduced; on the other hand, the steering directions of the two propellers are opposite to balance the torsion in the rotation process of the single propeller, so that the running of the propeller is smoother and more reliable;

(4) The stator component is arranged on the inner side of the outer shell, so that the structure of the propeller is more compact;

(5) According to the utility model, the stator assembly is uniformly output to the driving circuit board through the grooves of the outer shell, so that the assembly of the wire outlet structure is simplified.

Drawings

FIG. 1 is a block diagram of a double-deck propeller of the present utility model;

FIG. 2 is an exploded view of a double-deck propeller of the present utility model;

FIG. 3 is a cross-sectional view of a dual-layer propeller of the present utility model;

fig. 4 is an overall structure diagram of the connection of a stator core and a stator coil in the present utility model;

FIG. 5 is an overall construction view of the outer housing of the present utility model;

fig. 6 is an overall structural view of the propeller of the present utility model.

Reference numerals: 1. the rotor comprises an outer shell, 2, a propeller, 3, a rotor shell, 4, a rotor shell cover, 5, a guide cover, 6, a shaft retainer ring, 7, a driving circuit board, 8, a limit groove, 9, a shaft sleeve, 10, a central shaft, 11, a rotor retainer ring, 12, a supporting part, 13, a first protruding part, 14, a radial limit part, 15, a limit screw, 16, a stator core, 17, a stator coil, 18, an outgoing line limit sleeve, 19, a mounting nut, 20, a permanent magnet, 21 spokes, 22, a second protruding part, 23, a positioning groove, 24, a shell, 25, a spline-like through hole, 26, a circular ring, 27, a blade, 28 and a containing part.

Detailed Description

The present utility model will be further described below based on preferred embodiments with reference to the accompanying drawings.

The terminology used in the description presented herein is for the purpose of describing embodiments of the utility model and is not intended to be limiting of the utility model. Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, as if they were fixedly connected, detachably connected, or integrally connected, for example; the two components can be connected mechanically, directly or indirectly through an intermediate medium, and can be communicated internally. The specific meaning of the above terms in the present utility model will be specifically understood by those skilled in the art.

In addition, in the description of the embodiments of the present utility model, various components on the drawings are enlarged or reduced for the convenience of understanding, but this is not intended to limit the scope of the present utility model.

Fig. 1 to 3 show an overall construction view, an exploded view and a sectional view of a double-layer propeller according to the present utility model, respectively, and as shown in fig. 1 to 3, the propeller includes an outer casing 1, an axial flux motor, two propellers 2, the outer casing 1 being installed at the outer side of the axial flux motor, the propellers 2 being installed at both sides of the axial direction of the axial flux motor.

In some preferred embodiments of the present utility model, the propeller further comprises a guide cover 5 corresponding to the propeller 2, the guide cover 5 is installed on one side of the propeller 2 away from the axial flux motor and is abutted against one end of the propeller 2 facing the guide cover 5, the outer surface of the guide cover 5 is arc-shaped, and the guide cover 5 can reduce water flow resistance during the running process of the propeller.

The axial flux motor comprises a stator assembly and two rotor assemblies, wherein the rotor assemblies are arranged on two sides of the stator assembly along the axial direction of the stator assembly, and the two rotor assemblies are opposite in steering, so that a single-stator driven double-rotor counter-rotating propeller is formed.

Further, as shown in fig. 2, the stator assembly includes a stator core 16 and a stator coil 17, and the stator coil 17 is wound on the stator core 16.

Specifically, fig. 4 shows an overall structure diagram of the connection between the stator core 16 and the stator coil 17 in the present utility model, and as shown in fig. 2 and 4, the two side end surfaces of the stator core 16 in the axial direction thereof have a symmetrical structure with protrusions on both sides, and can be respectively matched with rotor assemblies located at both sides in the axial direction thereof, so that only one stator assembly is required to be provided to drive the two rotor assemblies to rotate in the synchronous circumferential direction.

Specifically, the stator core 16 includes a supporting portion 12 and a plurality of first protruding portions 13, where the supporting portion 12 is in a ring-shaped structure, and the plurality of first protruding portions 13 are located between an outer ring and an inner ring of the stator core 16, and extend radially and are uniformly distributed circumferentially along the same.

In some preferred embodiments of the present utility model, the stator coil 17 is uniformly wound around the outer contour of the first boss 13.

In some preferred embodiments of the present utility model, stator core 16 is integrally formed instead of the conventional silicon steel sheet lamination process. On one hand, during the advancing process of the propeller, the energy loss caused by vortex can be reduced; on the other hand, the working time can be greatly saved, and the working efficiency is improved.

Specifically, the present utility model realizes the integral molding production of the stator core 16 by the iron powder die casting molding process.

Further, as shown in fig. 2, each rotor assembly includes a rotor fixing member and a permanent magnet 20, the interior of the rotor fixing member is a cavity structure matched with the permanent magnet 20, and the permanent magnet 20 is mounted inside the rotor fixing member.

Specifically, the rotor mounting includes rotor shell 3 and rotor cap 4, and rotor shell 3 is the cylindrical structure of one end confined, and rotor cap 4 can be dismantled with the free end of rotor shell 3 and be connected, and the axial spacing of permanent magnet 20 can be realized to the blind end of rotor shell 3 and rotor cap 4 cooperation.

It is conceivable that the rotor housing cover 4 and the rotor housing 3 can be detachably connected by means of bonding, welding, screw connection and the like, and in the utility model, the rotor housing cover 4 and the rotor housing 3 can be detachably connected by means of bonding, so that the rotor housing cover has the advantages of good sealing effect and simple processing technology.

Further, as shown in fig. 2, the rotor fixing piece further includes a radial limiting portion 14, the radial limiting portion 14 is coaxially disposed with the rotor housing 3, one end of the radial limiting portion is fixedly connected with the closed end of the rotor housing 3, the other end of the radial limiting portion penetrates through the permanent magnet 20, the rotor housing cover 4 and the propeller 2 in sequence and is detachably connected with the air guide sleeve 5, and the radial limiting portion 14 can achieve radial limiting of the permanent magnet 20 and the propeller 2.

Further, as shown in fig. 2, in the present utility model, the pod 5 is detachably connected to the radial limiting portion 14 by a limiting screw 15.

Specifically, fig. 6 shows an overall structure of the propeller 2 in the present utility model, as shown in fig. 6, the propeller 2 is a cylindrical structure with one end closed, the propeller 2 includes a ring 26 and blades 27, the blades 27 are connected to the outer side of the ring 26 and form an integrated structure with the ring 26, and the rotor assembly is installed in the ring 26.

Further, the closed end of the propeller 2 is located at one side far away from the stator assembly, a spline-like through hole 25 penetrating along the axial direction of the closed end is formed in the closed end, and the rotor assembly can transmit the trend of circumferential rotation to the propeller 2 in a spline-like connection mode.

Further, the propeller 2 further includes a plurality of second protruding portions 22, the second protruding portions 22 are located at the outer sides of the spline-like through holes 25, the second protruding portions 22 extend along the axial direction of the propeller 2 and circumferentially surround the propeller 2, and a positioning groove 23 matched with the second protruding portions 22 is formed in one side, facing the air guide cover 5, of the radial limiting portion 14. The second protruding portion 22 cooperates with the positioning groove 23, so that circumferential limitation of the rotor assembly and the propeller 2 can be achieved, and the rotor assembly and the propeller 2 can synchronously rotate circumferentially.

Specifically, the second protruding portions 22 correspond to the limit screws 15 in number, and the bottom ends of the nuts of the limit screws 15 abut against the top ends of the second protruding portions 22, so that the propeller 2 can be restricted from moving in the axial direction thereof.

Further, as shown in fig. 2, the propeller further comprises two rotor check rings 11, wherein the rotor check rings 11 are positioned on one side of the propeller 2 close to the stator assembly, and the rotor check rings 11 are matched with the propeller 2 to realize axial limiting of the rotor assembly.

Further, in order to achieve coaxiality of the two rotor assemblies, the propeller further comprises a shafting assembly, the two rotor assemblies and the stator assembly are connected through the shafting assembly, the shafting assembly penetrates through the stator core 16 and the rotor assembly and is detachably connected with the propeller 2 and the guide cover 5, the shafting assembly is movably connected with the stator core 16 and is detachably connected with the rotor assembly, and the rotor assembly and the shafting assembly can synchronously rotate circumferentially.

Specifically, as shown in fig. 2, the shafting assembly includes a center shaft 10 and two shaft retainers 6, and the center shaft 10 penetrates through the stator core 16, the rotor retainer 11, the rotor assembly, and the propeller 2 and is engaged with the shaft retainers 6.

Specifically, the central shaft 10 is of a cylindrical structure, an annular groove matched with the shaft retainer ring 6 is formed in the periphery of the central shaft, and the shaft retainer ring 6 is matched with the annular groove, so that axial limiting of the rotor assembly can be achieved.

Further, the central shaft 10 is connected with the stator core 16 in an interference fit manner, two annular protrusions are convexly arranged on the periphery of the central shaft 10, the annular protrusions are located on two sides of the stator core 16 along the axial direction of the stator core, and two end faces of each annular protrusion along the axial direction of the annular protrusion are respectively abutted with the rotor retainer ring 11 and the stator core 6. On one hand, the annular bulge can be matched with the check ring 6 for the shaft to respectively realize the axial limit of the rotor assemblies at two sides; on the one hand, the two annular protrusions can realize axial limit of the stator core 16; on the other hand, the annular protrusion can realize the separation of the stator assembly and the rotor assembly, and prevent the stator assembly from being in direct contact with the rotor assembly to generate abrasion.

In some preferred embodiments of the present utility model, as shown in fig. 4, the stator core 16 further includes a sleeve 9 located at the axial center thereof, and the inner periphery of the sleeve 9 directly abuts against and is in interference fit with the outer periphery of the central shaft 10. Specifically, the central shaft 10 and the stator core 16 are stationary during the running of the propeller, and the rotor assembly and the propeller 2 can rotate circumferentially around the central shaft 10.

In some embodiments of the utility model, the sleeve 9 is made of stainless steel, carbon steel or the like.

In some preferred embodiments of the utility model, the sleeve 9 is made of a polymeric water lubricated bearing material, which is a novel polymeric material. On one hand, the material has good lubrication and wear resistance, so that the shaft sleeve 9 can replace the traditional various rolling bearings, and the structure such as a bearing is not needed between the shaft sleeve 9 and the central shaft 10, thereby simplifying the size of the propeller and enabling the overall structure of the propeller to be simpler and more compact; on the other hand, the material has good corrosion resistance, so that the propeller still has good application prospect in the marine environment, and the shaft sleeve 9 is not required to be independently protected by a sealing structure, thereby saving the cost and further reducing the volume of the propeller.

Furthermore, the rotor fixing piece is made of the polymer water lubrication bearing material, on one hand, the material has good lubrication and wear resistance, so that the structure such as a bearing is not needed between the central shaft 10 and the radial limiting part 14, the structure of the propeller is further simplified, and the whole structure of the propeller is simpler and more compact; on the other hand, the material has good corrosion resistance, so that the propeller still has good application prospect in the marine environment, and a sealing structure is not required to be designed to independently protect the rotor fixing piece, thereby saving the cost and further reducing the volume of the propeller.

Further, fig. 5 shows an overall structure of the outer casing 1 according to the present utility model, and as shown in fig. 5, the outer casing 1 includes a casing 24, a receiving portion 28, and a plurality of spokes 21, the receiving portion 28 and the spokes 21 are located inside the casing 24, the receiving portion 28 is used for mounting a stator assembly, and the spokes 21 are used for achieving stable connection of the receiving portion 28 and the casing 24.

Specifically, the accommodating portion 28 has a cylindrical structure, and the accommodating portion 28 is disposed coaxially with the stator core 16.

Specifically, the spokes 21 extend radially along the accommodating portion 28, and have one end fixedly connected to the outer side of the accommodating portion 28 and the other end fixedly connected to the inner side of the housing 24.

In some preferred embodiments of the present utility model, the spokes 21 are evenly distributed along the circumference of the receiving portion 28, and the number of spokes 21 is 4.

It is conceivable that at least two spokes 21 may be provided as required to achieve a stable connection of the receiving portion 28 with the housing 24.

It is envisioned that spokes 21, housing 24, and receptacles 28 may be fixedly coupled by gluing, welding, screwing, integrally forming, etc. In some preferred embodiments of the present utility model, the spokes 21, the housing 24 and the receiving portion 28 are manufactured by an integral molding. On one hand, the production time can be greatly shortened, and the production efficiency is improved; on one hand, the integrated forming mode has the advantage of stable connection; on the other hand, when the propeller travels in a marine environment, seawater may contact the joint and accelerate corrosion of solder, glue, etc., so that the connection of the outer case 1 is unstable.

Further, as shown in fig. 5, one of the spokes 21 is provided with a groove through which the wiring of the stator coil 17 uniformly extends to the outside of the outer case 1.

Specifically, the outer casing 1 further includes a driving circuit board 7 and a square casing protruding from the outer wall of the outer casing 24, a square groove is formed in the square casing, the driving circuit board 7 is mounted in the square groove, and the lines of the stator coil 17 extend into the square groove through grooves of the spokes 21 and are welded with the driving circuit board 7.

Further, the square shell is fixedly connected with the outer shell 1. It is conceivable that the square housing and the outer housing 1 may be fixedly connected by welding, bonding, integral molding, or the like, and in the present utility model, the square housing and the outer housing 1 are integrally molded.

Further, as shown in fig. 5, the square housing is screw-coupled with an external device through a mounting nut 19, thereby achieving detachable coupling of the propeller with the external device.

Specifically, the outer casing 1 further includes an outgoing line limiting sleeve 18, the outgoing line limiting sleeve 18 is in a cylindrical structure, a through channel is formed between the outgoing line limiting sleeve 18 and the square groove, and the external plug wire can enter the square groove from the outgoing line limiting sleeve 18 and is electrically connected with the driving circuit board 7.

Specifically, after the patch cord and the circuit of the stator coil 17 are connected with the driving circuit board 7, the square groove of the square shell is encapsulated by epoxy resin. On one hand, the stable connection of the external plug wire, the circuit of the stator coil 17 and the driving circuit board 7 can be realized, and the problem of unstable electrical connection caused by shaking of the propeller is prevented; on the other hand, can realize the inside sealed of square casing, prevent that liquid from getting into the inside problem that causes circuit damage of square casing.

Specifically, after the propeller is integrally mounted and the wiring of the external plug wire and the stator coil 17 is connected with the drive circuit board 7, the grooves of the spokes 21 are encapsulated with epoxy resin. On the one hand, the stable connection between the line of the stator coil 17 and the spoke 21 can be realized, and the problem that the line is separated from the spoke 21 due to shaking of the propeller is prevented; on the other hand, the sealing of the stator coil 17 line can be achieved, preventing corrosion of the line caused by contact of the liquid with the line.

Specifically, after the propeller is integrally mounted, the accommodating portion 28 is potted with epoxy resin. On the one hand, stable connection of the stator coil 17 and the stator core 16 can be achieved; on the other hand, the stator coil 17 and the stator core 16 can be sealed, and the liquid is prevented from entering the inside of the accommodating portion 28 to corrode the stator core 16.

In some preferred embodiments of the utility model, the outer contour of the outer housing 1 is of a streamlined configuration, which further reduces the resistance to water flow during the travel of the propeller.

Further, in the present utility model, the reversing of the two rotor assemblies can be achieved by setting the permanent magnets 20 in the two rotor assemblies to be opposite in polarity. The two rotor assemblies are turned oppositely, so that the two propellers 2 are turned oppositely, the torsion when the single propeller 2 rotates can be balanced, and the running of the propeller is smoother and more reliable.

Further, in order to achieve stable acceleration of the propeller, a uniform thrust is required to be formed when the rotor assembly is turned in opposite directions, so that the blades 27 of the two propellers 2 are turned in opposite directions in the present utility model, that is, the two propellers 2 are positive and negative blades.

While the foregoing is directed to embodiments of the present utility model, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims (12)

1. A double-deck propeller propulsion, characterized in that:

the propeller comprises an outer shell (1), an axial flux motor and two propellers (2), wherein the outer shell (1) is arranged on the outer side of the axial flux motor, and the propellers (2) are arranged on two sides of the axial flux motor in the axial direction;

the axial flux motor comprises a stator assembly and two rotor assemblies, wherein the rotor assemblies are arranged inside the propeller (2), the rotor assemblies are arranged on two sides of the stator assembly along the axial direction of the stator assembly, the two rotor assemblies are opposite in steering, and the two propellers (2) are positive and negative paddles.

2. A double-deck propeller as claimed in claim 1, wherein:

the propeller further comprises a shafting assembly, the shafting assembly penetrates through the stator assembly, the rotor assembly and the propeller (2) are detachably connected, the shafting assembly is in interference fit with the stator assembly and is detachably connected with the rotor assembly, and the rotor assembly can rotate circumferentially relative to the stator assembly and synchronously.

3. A double-deck propeller as claimed in claim 1, wherein:

each rotor assembly comprises a rotor fixing piece and a permanent magnet (20), wherein the interior of the rotor fixing piece is of a cavity structure matched with the permanent magnet (20), and the permanent magnet (20) is arranged in the interior of the rotor fixing piece;

the rotor fixing piece comprises a rotor shell (3) and a rotor shell cover (4), the rotor shell (3) is of a cylindrical structure with one end closed, and the rotor shell cover (4) is detachably connected with the free end of the rotor shell (3);

the permanent magnets (20) of the two rotor assemblies are of opposite polarity;

the rotor fixing piece is made of a high polymer water lubrication bearing material.

4. A double-deck propeller according to claim 3, characterized in that:

the rotor fixing piece further comprises a radial limiting part (14), the radial limiting part (14) and the rotor shell (3) are coaxially arranged, one end of the radial limiting part is fixedly connected with the closed end of the rotor shell (3), and the other end of the radial limiting part sequentially penetrates through the permanent magnet (20), the rotor shell cover (4) and the rotor shell cover (2) and is detachably connected with the propeller.

5. A double-deck propeller as claimed in claim 1, wherein:

the propeller further comprises a guide cover (5) corresponding to the propeller (2), and the guide cover (5) is detachably connected to one side, away from the axial flux motor, of the propeller (2);

the air guide sleeve (5) is abutted with the propeller (2).

6. A double-deck propeller as claimed in claim 2, wherein:

the stator assembly comprises a stator core (16) and stator coils (17), wherein the two side end surfaces of the stator core (16) along the axial direction of the stator core are in a bilateral convex symmetrical structure;

the stator core (16) comprises a supporting portion (12) and a plurality of first protruding portions (13), the supporting portion (12) is of a circular ring-shaped structure, the plurality of first protruding portions (13) are located between an outer ring and an inner ring of the stator core (16) and extend radially and are evenly distributed circumferentially, and the stator coils (17) are evenly wound on the first protruding portions (13).

7. A double-deck propeller as claimed in claim 6, wherein:

the propeller further comprises a rotor retainer ring (11), the rotor retainer ring (11) is located on one side, close to the stator assembly, of the propeller (2), and the rotor retainer ring (11) is matched with the propeller (2) to achieve axial limiting of the rotor assembly.

8. A double-deck propeller as claimed in claim 7, wherein:

the shafting assembly comprises a central shaft (10) and two shaft check rings (6), wherein the central shaft (10) penetrates through the stator core (16), the rotor check ring (11), the rotor assembly and the propeller (2) and is clamped with the shaft check rings (6);

the central shaft (10) is of a cylindrical structure, and an annular groove matched with the shaft retainer ring (6) is formed in the periphery of the central shaft;

the stator core is characterized in that the central shaft (10) is in interference fit with the stator assembly, two annular protrusions are arranged on the periphery of the central shaft (10) in a protruding mode, the annular protrusions are located on two sides of the stator core (16) along the axial direction of the stator core, and two end faces of each annular protrusion along the axial direction of the stator core are respectively abutted to the rotor retainer ring (11) and the stator core (16).

9. A double-deck propeller as claimed in claim 8, wherein:

the stator core (16) further comprises a shaft sleeve (9) positioned at the shaft center of the stator core, and the inner periphery of the shaft sleeve (9) is directly abutted to the outer periphery of the central shaft (10) and in interference fit.

10. A double-deck propeller as claimed in claim 6, wherein:

the outer shell (1) comprises a shell (24), a containing part (28) and a plurality of spokes (21), the rotor assembly is installed in the containing part (28), and the spokes (21) are positioned between the shell (24) and the containing part (28) and are fixedly connected with the shell (24) and the containing part (28);

the accommodating part (28) is of a cylindrical structure and is coaxially arranged with the rotor assembly, and the spokes (21) extend along the radial direction of the accommodating part (28) and are uniformly distributed in the circumferential direction;

the accommodating part (28) is encapsulated by epoxy resin.

11. A double-deck propeller as claimed in claim 10, wherein:

the outer shell (1) further comprises a driving circuit board (7), a square shell and an outgoing line limit sleeve (18), wherein the square shell is convexly arranged on the outer wall of the outer shell (24), the driving circuit board (7) is arranged in the square shell, the outgoing line limit sleeve (18) and the square shell form a through channel, and an external plug wire can enter the square shell from the outgoing line limit sleeve (18) and is electrically connected with the driving circuit board (7);

grooves are formed in one spoke (21), and the lines of the stator coils (17) uniformly extend into the square shell through the grooves and are welded with the driving circuit board (7);

and the groove and the square shell are encapsulated by epoxy resin.

12. A double-deck propeller as claimed in claim 1, wherein:

the propeller (2) is of a cylindrical structure with one end closed, and comprises a circular ring (26) and blades (27), wherein the blades (27) are connected to the outer side of the circular ring (26), and the rotor assembly is arranged in the circular ring (26);

the closed end of the propeller (2) is located at one side far away from the stator assembly, a spline-like through hole penetrating along the axial direction of the propeller (2) is formed in the closed end, and the rotor assembly transmits a circumferential rotation trend to the propeller (2) through a spline-like connection mode.