Electric shaftless propeller
By abolishing the dynamic seal and adopting an integrated design of glue filling, the sealing and heat dissipation of shaftless thrusters are solved, achieving higher reliability and easy maintenance.
Patent Information
- Application Number
- CN202420180961.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-01-25
AI Technical Summary
Existing shaftless thrusters have problems with sealing and heat dissipation. Large size of dynamic seals leads to low life and risk of leakage, and insufficient heat dissipation performance.
An electric shaftless thruster is designed, using a casing, stator assembly, rotor assembly and blade assembly. The stator winding and rotor magnet are formed into a whole by glue, canceling the dynamic seal, and using static seals and specific bearing designs to improve Heat dissipation performance.
Achieve better heat dissipation performance, reduce maintenance complexity and cost, and improve the reliability and ease of maintenance of the thruster.
Smart Images
Figure CN222496616U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an underwater propeller, in particular to an electric shaftless propeller. Background Art
[0002] Traditional underwater shafted propellers are generally ducted propellers, and the output shaft drives the blades, while shaftless propellers are hollow inner ring rotating direct drive blades. The length of the shaft is long, and there is an obstruction for the water flow to flow through the motor behind the shaft. Under the same weight and volume, the motor diameter of the shaft is smaller than the outer diameter of the blades, while the motor diameter of the shaftless propeller is the overall outer diameter of the propeller, which can obtain a larger motor diameter, higher power density, and no obstruction of the blades. Because the motor diameter is large, the shaftless motor can achieve the motor torque of the ducted propeller at a shorter length, so the shaftless propeller is flatter and occupies less volume. Because of the shaft output of traditional underwater shafted propellers, the blades are easily entangled by underwater debris such as water plants and fishing nets, and the rotation of the blades will wrap the debris around the central axis. The center of the blade of the shaftless propeller is through, and slender debris can flow directly through the middle opening, and larger debris can also be discharged through the forward and reverse rotation of the motor, and will not gradually wrap around the central axis. In order to obtain higher blade efficiency, traditional underwater shafted propellers will wrap a circle of duct around the outside of the blade to improve thrust performance. There must be a gap between the edge of the blade and the inner diameter of the duct to prevent the blade from rubbing against the duct. This gap will also cause debris to get entangled and stuck between the inner wall of the duct and the end of the blade. This gap will also cause the water flow to produce a pressure difference between the tip of the blade and the inner diameter of the duct. This pressure difference will cause cavitation and wear on the blade tip. Traditional underwater shafted propellers generally have motor transmission through bearings, bushings, reducers, seals or magnetic couplings, which will cause losses to the motor output. Shaftless propellers have rotors that directly drive the blades.
[0003] The existing shaftless thrusters have dynamic seals similar to oil seals to complete the rotary seal, and are usually filled with oil. Compared with shaft thrusters, the seal ring size is inevitably larger. The larger the size of the dynamic seal, the greater the linear speed of the rotor when it rotates, which means that the dynamic seal is quickly rubbed and heated, resulting in a shorter life and a high risk of leakage. As the depth increases and the water pressure increases, the sealing lip of the dynamic seal will generally be pressed tighter and tighter, resulting in greater power loss. Filling with oil to balance the internal and external pressures also has the risk of power loss and oil leakage, and both filling with oil and adding seals will make the structure complicated, difficult to maintain and high in cost. Utility Model Content
[0004] The utility model aims to provide an electric shaftless thruster, which does not need to adopt dynamic seals and has better heat dissipation performance. At the same time, it is convenient to disassemble during later maintenance and it is easier to replace parts.
[0005] The technical solution for realizing the purpose of the utility model is as follows: the utility model comprises a housing, a stator assembly, a rotor assembly and a blade assembly; the stator assembly comprises a stator core and a stator winding arranged on the stator core; the rotor assembly comprises an annular rotor seat and a rotor magnet; a mounting groove coaxial with the rotor seat is provided on the outer circumferential surface of the rotor seat; rotor magnets are fixedly arranged in the mounting groove along the distribution path of the mounting groove; a through-tube shell-shaped mounting portion is provided on the housing; the stator core is fixedly connected to the tube shell-shaped mounting portion; The rotor seat is provided on the inner wall of the mounting portion and is coaxial with the tubular mounting portion; the front end and the rear end of the rotor seat are rotatably connected to the housing through the front end bearing and the rear end bearing respectively; the stator winding is coaxially arranged with the rotor seat, and the stator winding is located outside the rotor seat; the stator assembly and the rotor assembly are respectively formed into a whole by glue pouring; the blade assembly includes an annular hub and a plurality of blades circumferentially distributed on the inner wall of the hub; the hub is coaxially arranged with the rotor seat and is located inside the rotor seat; the hub is fixedly connected with the rotor seat;
[0006] The front end bearing comprises a front end bearing movable ring, a front end bearing static ring and a front end static ring bearing seat; the rear end bearing comprises a rear end bearing movable ring, a rear end bearing static ring and a rear end static ring bearing seat; the front end bearing movable ring and the rear end bearing movable ring are respectively fixedly connected to the front end and the rear end of the rotor seat; the front end bearing static ring and the rear end bearing static ring are respectively fixedly connected to the front end static ring bearing seat and the rear end static ring bearing seat; the front end static ring bearing seat is fixedly connected to the front end of the casing, and causes the front end bearing static ring to be sleeved in the front end open matching groove of the front end bearing movable ring with an L-shaped cross section and form a rotational fit; the rear end static ring bearing seat is fixedly connected to the rear end of the casing, and causes the rear end bearing static ring to be sleeved in the rear end open matching groove of the rear end bearing movable ring with an L-shaped cross section and form a rotational fit.
[0007] Furthermore, the front end bearing static ring is evenly distributed with a plurality of first notches along the circumference of its axis; the first notches include a first axial notch extending axially and a first radial notch extending radially; the first axial notch and the axial inner wall of the front end open matching groove form a first water channel, and the first radial notch and the radial inner wall of the front end open matching groove form a second water channel; the first water channel is connected to the second water channel; the second water channel is connected to the air gap between the stator assembly and the rotor assembly;
[0008] A plurality of second notches are evenly distributed on the static ring of the rear end bearing along the circumference of its axis; the second notches include a second axial notch extending axially and a second radial notch extending radially; the second axial notch and the axial inner wall of the rear end open matching groove form a third water channel, and the second radial notch and the radial inner wall of the rear end open matching groove form a fourth water channel; the third water channel is connected to the fourth water channel; the fourth water channel is connected to the air gap between the stator assembly and the rotor assembly.
[0009] Furthermore, the minimum inner diameter of the above-mentioned front end stationary ring bearing seat is smaller than the axial contact surface diameter of the front end bearing movable ring and the front end bearing stationary ring; the minimum inner diameter of the rear end stationary ring bearing seat is smaller than the axial contact surface diameter of the rear end bearing movable ring and the rear end bearing stationary ring.
[0010] A plurality of front water inlets are distributed along the circumference of the axis of the inner edge of the front stationary ring bearing seat; the axial projection of the front water inlet does not exceed the contact surface between the front bearing moving ring and the front bearing stationary ring in the axial direction;
[0011] A plurality of rear water inlets are distributed along the circumference of the axis of the inner edge of the rear stationary ring bearing seat; the axial projection of the rear water inlet does not exceed the axial contact surface between the rear bearing moving ring and the rear bearing stationary ring.
[0012] Furthermore, the front water inlet is a notch that is radially concave toward the front stationary ring bearing seat; and the rear water inlet is a notch that is radially concave toward the rear stationary ring bearing seat.
[0013] Furthermore, the above-mentioned rotor seat includes a front-end rotor seat and a rear-end rotor seat fixedly connected together; an installation groove for installing the rotor magnet is formed between the front-end rotor seat and the rear-end rotor seat; a glue storage groove for the rotor magnet is provided in the installation groove; the rotor magnet is fixedly glued in the installation groove by structural glue; the front-end bearing movable ring is sleeved on the front end of the front-end rotor seat and fixedly connected to the front-end rotor seat by structural glue; the rear-end bearing movable ring is sleeved on the rear end of the rear-end rotor seat and fixedly connected to the rear-end rotating seat by structural glue.
[0014] Furthermore, a front-end moving ring glue storage groove is provided at the connection between the front-end rotor seat and the front-end bearing moving ring; the front-end bearing moving ring is fixedly connected to the front-end rotor seat by structural glue; a rear-end moving ring glue storage groove is provided at the connection between the rear-end rotor seat and the rear-end bearing moving ring; the rear-end bearing moving ring is fixedly connected to the rear-end rotor seat by structural glue.
[0015] A first sealing ring groove is arranged on the joint surface of the front rotor seat and the rear rotor seat; a first sealing ring is arranged in the first sealing ring groove.
[0016] Furthermore, the above-mentioned casing is formed by splicing a front end shell and a rear end shell; the front end shell and the rear end shell are coaxially arranged; the splicing of the front end shell and the rear end shell forms a clamping groove for clamping the stator core; a shell glue storage groove is provided at the bottom of the clamping groove; the stator core is fixedly connected to the casing by filling the structural glue in the clamping groove; a second sealing ring groove is provided on the splicing surface of the front end shell and the rear end shell; a second sealing ring is provided in the second sealing ring groove.
[0017] Furthermore, the casing is provided with a wire outlet; the casing is fixedly provided with a terminal block covered at the wire outlet; the terminal block is provided with a cable outlet and a glue filling port; the lead wires of the stator winding pass through the wire outlet and the cable outlet in sequence and then pass out of the casing; the terminal block is filled with glue to form a waterproof seal.
[0018] Furthermore, the front stationary ring bearing seat and the rear stationary ring bearing seat are fixedly connected to the casing by screws, and a gap sheet is placed between the front stationary ring bearing seat and the rear stationary ring bearing seat and the casing.
[0019] Furthermore, the casing and the stator assembly are integrally formed by filling with filling glue; the outer surface of the rotor magnet is sprayed with a hard coating or wrapped with carbon fiber.
[0020] Furthermore, the front bearing moving ring, the front bearing static ring, the rear bearing moving ring and the rear bearing static ring are all made of cemented carbide, which is wear-resistant and corrosion-resistant, has a very small dimensional tolerance after fine grinding, has a hardness of ≥80HRA, and a density of 12-16g / cm 3 .
[0021] The utility model has positive effects: (1) In the utility model, the stator assembly and the rotor assembly are both separate entities, and the stator winding and the rotor magnet are both wrapped and glued, without the need for additional dynamic seals. In the utility model, the first sealing ring and the second sealing ring are both static seals and do not rotate. Water can flow directly through the first gap, the second gap and the air gap, thereby achieving better heat dissipation.
[0022] (2) In terms of maintenance, the parts that are easily damaged include the blade assembly, the front bearing dynamic ring, the rear bearing dynamic ring, the front bearing static ring and the rear bearing static ring. These can be quickly disassembled and replaced. The rotor assembly can also be directly disassembled and replaced because it is an independent whole. The front bearing static ring and the rear bearing static ring are respectively fixedly connected to the front static ring bearing seat and the rear static ring bearing seat, so they can also be directly replaced; the blade assembly is installed on the rotor seat and can also be removed and replaced separately. It can be seen that the utility model is easy to disassemble during later maintenance and it is easier to replace parts.
[0023] (3) In the utility model, the front end bearing static ring and the rear end bearing static ring are respectively provided with a first notch and a second notch. During rotation, water can flow in from the first notch and the second notch and form a layer of water film on the friction surface, which helps to dissipate heat and reduce rotational friction, and can also remove fine impurities and dust.
[0024] (4) In the present invention, both the front end open matching groove and the rear end open matching groove adopt an L-shaped cross-section. Such a design can withstand radial force and axial force at the same time, so that the rotor assembly can be fixed in coaxial rotation, and can also rotate while the static ring is pressed down by the reaction force of the water flow.
[0025] (5) The design of the front and rear water inlets in the utility model prevents water from directly rushing into the bearing friction contact surface, thereby preventing the entry of small debris such as sand and gravel. At the same time, water flows from the front and rear water inlets through the bearing friction contact surface and enters the air gap between the stator assembly and the rotor assembly, so that the water flow not only lubricates the bearing friction contact surface but also takes away the heat generated by the stator winding, the front bearing friction, and the rear bearing friction. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.
[0027] Figure 1 It is a schematic diagram of the structure of the utility model;
[0028] Figure 2 It is an explosion diagram of the utility model;
[0029] Figure 3 It is a cross-sectional view of the utility model;
[0030] Figure 4 It is a structural schematic diagram of the stator assembly in the utility model;
[0031] Figure 5 It is a structural schematic diagram of the rotor assembly in the utility model;
[0032] Figure 6 This is a schematic diagram of the structure of the front end bearing dynamic ring of the utility model;
[0033] Figure 7 This is a schematic diagram of the structure of the static ring of the front end bearing of the utility model;
[0034] Figure 8 This is a schematic diagram of the structure of the static ring of the middle and rear end bearing of the utility model;
[0035] Fig. 9 It is a schematic diagram of the cooperation between the front end bearing dynamic ring and the front end bearing static ring in the utility model;
[0036] Fig.10 for Fig. 9 A cross-sectional view of
[0037] Fig.11 for Figure 3 The enlarged view of point A in the middle;
[0038] Fig.12 for Figure 3 The enlarged view of point B in the middle;
[0039] Fig.13 for Figure 3Enlarged view of point C in the middle. DETAILED DESCRIPTION
[0040] See Figures 1 to 13 The utility model comprises a housing 1, a stator assembly 2, a rotor assembly 3 and a blade assembly 4; the stator assembly 2 comprises a stator core 21 and a stator winding 22 arranged on the stator core 21; the rotor assembly 3 comprises an annular rotor seat 31 and a rotor magnet 32; a mounting groove coaxial with the rotor seat 31 is provided on the outer circumferential surface of the rotor seat 31; the rotor magnet 32 is fixedly arranged in the mounting groove along the distribution path of the mounting groove; a through-tube shell-shaped mounting portion is provided on the housing 1; the stator core 21 is fixedly connected to the tube shell-shaped mounting portion The rotor seat 31 is disposed on the inner wall of the rotor 31 and is coaxial with the tubular shell-shaped mounting portion; the front end and the rear end of the rotor seat 31 are rotatably connected to the housing 1 through the front end bearing 5 and the rear end bearing 6 respectively; the stator winding 22 is coaxially arranged with the rotor seat 31, and the stator winding 22 is located outside the rotor seat 31; the blade assembly 4 includes an annular hub 41, and a plurality of blades 42 circumferentially distributed on the inner wall of the hub 41; the hub 41 is coaxially arranged with the rotor seat 31 and is located inside the rotor seat 31; the hub 41 is fixedly connected with the rotor seat 31 through bolts 43;
[0041] The front end bearing 5 includes a front end bearing moving ring 51, a front end bearing stationary ring 52 and a front end stationary ring bearing seat 53; the rear end bearing 6 includes a rear end bearing moving ring 61, a rear end bearing stationary ring 62 and a rear end stationary ring bearing seat 63; the front end bearing moving ring 51 and the rear end bearing moving ring 61 are respectively fixedly connected to the front end and the rear end of the rotor seat 31; the front end bearing stationary ring 52 and the rear end bearing stationary ring 62 are respectively fixedly connected to the front end stationary ring bearing seat 53 and the rear end stationary ring bearing seat 63; the front end stationary ring bearing seat 53 is fixedly connected to the front end of the casing 1, and prompts the front end bearing stationary ring 52 to be sleeved in the front end open matching groove 511 of the front end bearing moving ring 51 with an L-shaped cross section and form a rotational fit; the rear end stationary ring bearing seat 63 is fixedly connected to the rear end of the casing 1, and prompts the rear end bearing stationary ring 62 to be sleeved in the rear end open matching groove of the rear end bearing moving ring 61 with an L-shaped cross section and form a rotational fit.
[0042] The front end bearing static ring 52 is provided with a plurality of first notches 521 evenly distributed along the circumference of its axis; the first notches 521 include an axially extending first axial notch 521-1 and a radially extending first radial notch 521-2; the first axial notch 521-1 and the axial inner wall of the front end open matching groove 511 form a first water channel, and the first radial notch 521-2 and the radial inner wall of the front end open matching groove 511 form a second water channel; the first water channel is connected to the second water channel; the second water channel is connected to the air gap between the stator assembly 2 and the rotor assembly 3;
[0043] The rear end bearing static ring 62 is provided with a plurality of second notches 621 evenly distributed along the circumference of its axis; the second notch 621 includes an axially extending second axial notch 621-1 and a radially extending second radial notch 621-2; the second axial notch 621-1 and the axial inner wall of the rear end open matching groove form a third water channel, and the second radial notch 621-2 and the radial inner wall of the rear end open matching groove form a fourth water channel; the third water channel is connected to the fourth water channel; the fourth water channel is connected to the air gap between the stator assembly 2 and the rotor assembly 3.
[0044] Since the rear end bearing rotating ring 61 and the front end bearing rotating ring 51 are symmetrically arranged in structure, they are not shown in a drawing here, but the structural schematic diagram of the front end bearing rotating ring 51 can be referred to.
[0045] The minimum inner diameter of the front stationary ring bearing seat 53 is smaller than the contact surface diameter of the front bearing moving ring 51 and the front bearing stationary ring 52 in the axial direction; the minimum inner diameter of the rear stationary ring bearing seat 63 is smaller than the contact surface diameter of the rear bearing moving ring 61 and the rear bearing stationary ring 62 in the axial direction. A plurality of front water inlets 531 are distributed along the circumference of the axis of the inner edge of the front stationary ring bearing seat 53; the axial projection of the front water inlet 531 does not exceed the contact surface of the front bearing moving ring 51 and the front bearing stationary ring 52 in the axial direction; a plurality of rear water inlets 631 are distributed along the circumference of the axis of the inner edge of the rear stationary ring bearing seat 63; the axial projection of the rear water inlet 631 does not exceed the contact surface of the rear bearing moving ring 61 and the rear bearing stationary ring 62 in the axial direction. For details, please refer to the attached drawings.
[0046] Since the rear stationary ring bearing seat 63 and the front stationary ring bearing seat 53 are symmetrical in structure, no drawings are provided here, but the structural schematic diagram of the front stationary ring bearing seat 53 may be referred to.
[0047] The front water inlet 531 is a notch that is radially concave toward the front stationary ring bearing seat 53 ; the rear water inlet 631 is a notch that is radially concave toward the rear stationary ring bearing seat 63 .
[0048] The rotor seat 31 includes a front-end rotor seat 311 and a rear-end rotor seat 312 fixedly connected together; a mounting groove for mounting the rotor magnet 32 is formed between the front-end rotor seat 311 and the rear-end rotor seat 312; a glue storage groove for the rotor magnet 32 is provided in the mounting groove; the rotor magnet 32 is fixedly pasted in the mounting groove by structural glue; the front-end bearing movable ring 51 is sleeved on the front end of the front-end rotor seat 311, and is fixedly connected to the front-end rotor seat 311 by structural glue; the rear-end bearing movable ring 61 is sleeved on the rear end of the rear-end rotor seat 312, and is fixedly connected to the rear-end rotating seat 312 by structural glue.
[0049] A front end dynamic ring glue storage groove is provided at the connection between the front end rotor seat 311 and the front end bearing dynamic ring 51; the front end bearing dynamic ring 51 is fixedly connected to the front end rotor seat 311 by structural glue; a rear end dynamic ring glue storage groove is provided at the connection between the rear end rotor seat 312 and the rear end bearing dynamic ring 61; the rear end bearing dynamic ring 61 is fixedly connected to the rear end rotor seat 312 by structural glue.
[0050] A first sealing ring groove is provided on the joint surface of the front rotor seat 311 and the rear rotor seat 312; a first sealing ring 313 is provided in the first sealing ring groove. After the first sealing ring 313 is clamped in the first sealing ring groove, water will not enter through the gap between the front rotor seat 311 and the rear rotor seat 312, thereby avoiding corrosion of the rotor magnet 32.
[0051] The housing 1 is formed by splicing a front housing 11 and a rear housing 12; the front housing 11 and the rear housing 12 are coaxially arranged; a clamping groove for clamping the stator core 21 is formed at the splicing of the front housing 11 and the rear housing 12; a housing glue storage groove 13 is provided at the bottom of the clamping groove; the stator core 21 is fixedly connected to the housing 1 by the structural glue filled in the clamping groove; a second sealing ring groove is provided on the splicing surface of the front housing 11 and the rear housing 12; a second sealing ring 14 is provided in the second sealing ring groove. Water will not enter the inside of the stator winding 22 from the gap between the front housing 11 and the rear housing 12 through the second sealing ring 14, and this second sealing ring 14 also prevents the glue from flowing out when the glue is poured into the inside later.
[0052] The housing 1 is provided with a wire outlet; the housing 1 is fixedly provided with a terminal block 7 which is covered at the wire outlet; the terminal block 7 is provided with a cable outlet 71 and a glue injection port 72; the lead wire of the stator winding 22 passes through the wire outlet and the cable outlet 71 in sequence and then passes out of the housing; the terminal block 7 is filled by injecting glue into the glue injection port 72 to form a waterproof seal. The glue injection port 72 is also provided with a cover 721. Of course, the lead wire can also pass through the cable outlet 71 and then pass through the box material seal (such as a fluororubber plug or other rubber plug) to tighten the lead wire gland 722 matched with the cable outlet 71, and the box material seal is compressed to seal the lead wire.
[0053] The front stationary ring bearing seat 53 and the rear stationary ring bearing seat 63 are fixedly connected to the housing 1 by screws 8, and a gap sheet 9 is placed between the front stationary ring bearing seat 53 and the rear stationary ring bearing seat 63 and the housing 1. The gap sheet 9 is a single piece or multiple pieces of stainless steel or other corrosion-resistant metal sheets with a thickness of 0.01mm-0.15mm or less selected as needed, which is used to adjust the gap between the dynamic and static rings. If the gap is pressed too tight, it will produce great resistance and be difficult to rotate. If it is too loose, it will give space for small impurities such as sand and gravel to enter. The appropriate distance is that after the assembly is completed, the rotor assembly 3 can be slightly shaken forward and backward but will not shake in the same axial direction. In this way, when the blade assembly 4 rotates in one direction, the reaction force of the water flow pushes the rotor assembly 3 to one side, and the bearings of one side (the front bearing 5 or the rear bearing 6) contact and start friction, and the other side does not need to participate in friction at this time.
[0054] The housing 1 and the stator assembly 2 are filled with a filling glue a to form a whole; the filling glue a flows to the tiny gaps of the stator winding 22 and the entire interior including the wiring part after defoaming and vacuuming, and then the stator winding 22 can be heated by electric current or placed in an oven for curing to increase fluidity and reduce bubbles. The inner wall opposite to the stator assembly 2 and the rotor assembly 3 can also be sprayed with a thin resin coating to prevent water from entering the gaps of the silicon steel sheets of the stator winding 22. The outer surface of the rotor magnet 32 is sprayed with a hard coating or wrapped with carbon fiber. That is, the stator assembly 2 and the rotor assembly 3 are respectively formed into a whole by glue pouring. The filling glue a and the hard coating can both be made of hard epoxy resin, and the hardness after curing is greater than or equal to 75D. The use of carbon fiber wrapping can form a thin and strong protective layer and can also prevent the displacement of the high-speed rotor magnet 32.
[0055] The front bearing moving ring 51, the front bearing static ring 52, the rear bearing moving ring 61 and the rear bearing static ring 62 are all made of hard alloy, which is wear-resistant and corrosion-resistant, has a very small dimensional tolerance after fine grinding, has a hardness of ≥80HRA, and a density of 12-16g / cm 3 .
[0056] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An electric shaftless propeller, comprising a housing, a stator assembly, a rotor assembly and a blade assembly; the stator assembly comprises a stator core and a stator winding arranged on the stator core; the rotor assembly comprises an annular rotor seat and a rotor magnet; a mounting groove coaxial with the rotor seat is provided on the outer circumferential surface of the rotor seat; rotor magnets are fixedly arranged in the mounting groove along the distribution path of the mounting groove; the characteristics are as follows: The casing is provided with a through-tube-shell-shaped mounting portion; the stator core is fixedly connected to the inner wall of the tube-shell-shaped mounting portion and is coaxial with the tube-shell-shaped mounting portion; the front end and the rear end of the rotor seat are rotatably connected to the casing through the front end bearing and the rear end bearing respectively; the stator winding is coaxially arranged with the rotor seat, and the stator winding is located outside the rotor seat; the stator assembly is formed as a whole by glue pouring; the blade assembly includes an annular hub and a plurality of blades circumferentially distributed on the inner wall of the hub; the hub is coaxially arranged with the rotor seat and is located inside the rotor seat; the hub is fixedly connected with the rotor seat; The front end bearing comprises a front end bearing movable ring, a front end bearing static ring and a front end static ring bearing seat; the rear end bearing comprises a rear end bearing movable ring, a rear end bearing static ring and a rear end static ring bearing seat; the front end bearing movable ring and the rear end bearing movable ring are respectively fixedly connected to the front end and the rear end of the rotor seat; the front end bearing static ring and the rear end bearing static ring are respectively fixedly connected to the front end static ring bearing seat and the rear end static ring bearing seat; the front end static ring bearing seat is fixedly connected to the front end of the casing, and causes the front end bearing static ring to be sleeved in the front end open matching groove of the front end bearing movable ring with an L-shaped cross section and form a rotational fit; the rear end static ring bearing seat is fixedly connected to the rear end of the casing, and causes the rear end bearing static ring to be sleeved in the rear end open matching groove of the rear end bearing movable ring with an L-shaped cross section and form a rotational fit.
2. The electric shaftless propeller according to claim 1, characterized in that: The front end bearing static ring is provided with a plurality of first notches evenly distributed along the circumference of its axis; the first notches include a first axial notch extending axially and a first radial notch extending radially; the first axial notch and the axial inner wall of the front end open matching groove form a first water channel, and the first radial notch and the radial inner wall of the front end open matching groove form a second water channel; the first water channel is connected to the second water channel; the second water channel is connected to the air gap between the stator assembly and the rotor assembly; A plurality of second notches are evenly distributed on the static ring of the rear end bearing along the circumference of its axis; the second notches include a second axial notch extending axially and a second radial notch extending radially; the second axial notch and the axial inner wall of the rear end open matching groove form a third water channel, and the second radial notch and the radial inner wall of the rear end open matching groove form a fourth water channel; the third water channel is connected to the fourth water channel; the fourth water channel is connected to the air gap between the stator assembly and the rotor assembly.
3. The electric shaftless propeller according to claim 2, characterized in that: The minimum inner diameter of the front stationary ring bearing seat is smaller than the axial contact surface diameter of the front bearing dynamic ring and the front bearing static ring; the minimum inner diameter of the rear stationary ring bearing seat is smaller than the axial contact surface diameter of the rear bearing dynamic ring and the rear bearing static ring.
4. The electric shaftless propeller according to claim 3, characterized in that: A plurality of front water inlets are distributed along the circumference of the axis of the inner edge of the front stationary ring bearing seat; the axial projection of the front water inlet does not exceed the contact surface between the front bearing moving ring and the front bearing stationary ring in the axial direction; A plurality of rear water inlets are distributed along the circumference of the axis of the inner edge of the rear stationary ring bearing seat; the axial projection of the rear water inlet does not exceed the axial contact surface between the rear bearing moving ring and the rear bearing stationary ring.
5. The electric shaftless propeller according to claim 4, characterized in that: The front water inlet is a notch that is radially concave toward the front stationary ring bearing seat; the rear water inlet is a notch that is radially concave toward the rear stationary ring bearing seat.
6. The electric shaftless propeller according to claim 1, characterized in that: The rotor seat includes a front-end rotor seat and a rear-end rotor seat fixedly connected together; an installation groove for installing a rotor magnet is formed between the front-end rotor seat and the rear-end rotor seat; a glue storage groove for sticking the rotor magnet is provided in the installation groove; the rotor magnet is fixedly pasted in the installation groove by structural glue; the front-end bearing movable ring is sleeved on the front end of the front-end rotor seat and fixedly connected to the front-end rotor seat by structural glue; the rear-end bearing movable ring is sleeved on the rear end of the rear-end rotor seat and fixedly connected to the rear-end rotating seat by structural glue.
7. The electric shaftless propeller according to claim 6, characterized in that: A front-end dynamic ring glue storage groove is provided at the connection between the front-end rotor seat and the front-end bearing dynamic ring; the front-end bearing dynamic ring is fixedly connected to the front-end rotor seat by structural glue; a rear-end dynamic ring glue storage groove is provided at the connection between the rear-end rotor seat and the rear-end bearing dynamic ring; the rear-end bearing dynamic ring is fixedly connected to the rear-end rotor seat by structural glue.
8. An electric shaftless propeller according to claim 6 or 7, characterized in that: A first sealing ring groove is arranged on the joint surface of the front rotor seat and the rear rotor seat; a first sealing ring is arranged in the first sealing ring groove.
9. The electric shaftless propeller according to claim 1, characterized in that: The casing is formed by splicing a front end shell and a rear end shell; the front end shell and the rear end shell are coaxially arranged; a clamping groove for clamping the stator core is formed at the joint of the front end shell and the rear end shell; a shell glue storage groove is provided at the bottom of the clamping groove; the stator core is fixedly connected to the casing by filling the structural glue in the clamping groove; a second sealing ring groove is provided on the splicing surface of the front end shell and the rear end shell; a second sealing ring is provided in the second sealing ring groove.
10. An electric shaftless propeller according to claim 1 or 9, characterized in that: The casing is provided with a wire outlet; the casing is fixedly provided with a terminal block covered at the wire outlet; the terminal block is provided with a cable outlet and a glue injection port; the lead wires of the stator winding pass through the wire outlet and the cable outlet in sequence and then pass out of the casing; the terminal block is filled with glue to form a waterproof seal.
11. The electric shaftless propeller according to claim 1, characterized in that: The front stationary ring bearing seat and the rear stationary ring bearing seat are fixedly connected to the casing by screws, and a gap sheet is placed between the front stationary ring bearing seat and the rear stationary ring bearing seat and the casing.
12. The electric shaftless propeller according to claim 1, characterized in that: The casing and the stator assembly are formed as a whole by filling with filling glue; the outer surface of the rotor magnet is sprayed with a hard coating or wrapped with carbon fiber.