Electric surfboard propeller

Abstract

The utility model relates to an electric surfboard, in particular to an electric surfboard propeller. A coupler on an existing integrated water-jet propeller is externally arranged without protection, multiple waterproof structures along a transmission shaft are complex, and transmission loss is large. The electric surfboard propeller comprises a shell with a flow channel, a coupler and a motor, the bottom and the tail end of the shell are provided with a water inlet and a jet orifice which are communicated with the flow channel respectively, guide vanes and a transmission shaft with an impeller are arranged in the flow channel, and the transmission shaft is connected with the motor through the coupler. The two ends of the transmission shaft are rotationally connected with the shell through a front bearing and a rear bearing respectively, a containing cavity is formed in the front of the shell and provided with a coupler, and the transmission shaft is provided with a first waterproof seal and a second waterproof seal to prevent water from flowing into the front bearing and the rear bearing in the front-back direction along the transmission shaft. The front waterproof seal and the rear waterproof seal are only arranged on the transmission shaft, the waterproof structure is simplified, transmission loss is reduced, the efficiency of the propeller is improved, and meanwhile the coupler is provided with a special arrangement protection cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of water jet propulsion pumps for electric surfboards, in particular to an electric surfboard propeller. Background Art

[0002] The working principle of a water jet propulsion device is to use a motor to drive an impeller with blades to rotate, converting water into a high-speed jet of water that is ejected backward to generate a reaction thrust, and is used on electric surfboards as a power propulsion device. The existing integrated water jet propulsion device includes a main housing and a guide shell fixed to its rear end, a motor fixed to the front end of the main housing, and the inner cavities of the main housing and the guide shell are connected to form a communicating water inlet and water outlet flow channel. A rotatable impeller is arranged in the flow channel, and the impeller is connected to the motor through a transmission shaft passing through the water inlet flow channel and an external coupling. The bottom opening of the main housing serves as a water inlet. Since the integrated propeller is immersed in water when not working, the motor and the coupling are above the water surface when the propeller is working. After the propeller is shut down, the motor and the coupling will be submerged in water, and waterproof protection is required. In order to prevent water from flowing along the transmission shaft to the bearings at both ends and affecting the bearings, waterproof seals need to be installed at multiple locations along the transmission shaft near the ends, at the connection between the transmission shaft and the coupling, and at the connection between the coupling and the motor shaft to deal with water immersion. Existing integrated water-cooled thrusters require multiple waterproof seals, especially the external coupling has high requirements for waterproofness, and the transmission seal structure of the thruster is complex. More waterproof seals will increase transmission losses, thereby wasting the power of the thruster. Utility Model Content

[0003] The technical problems to be solved and the technical tasks proposed by the utility model are aimed at the technical problems that the coupling of the existing integrated water jet propulsion device is externally placed without protection, and multiple waterproofing needs to be set along the axial direction of the transmission shaft, resulting in complex propeller sealing structure and transmission loss. The utility model provides an electric surfboard propeller, in which the coupling is built into the inner side of one end of the main shell for protection, and only two waterproof seals need to be set along the axial direction of the transmission shaft, which greatly simplifies the transmission sealing structure of the propeller, makes the entire propeller structure more compact and more waterproof, and reduces the power loss in the transmission when the propeller is working.

[0004] The utility model adopts a technical solution to solve the technical problem: an electric surfboard thruster, comprising a shell with a flow channel, a coupling and a motor, wherein a water inlet and a jet port connected to the flow channel are respectively arranged at the bottom and the tail end of the shell, a plurality of guide blades and a transmission shaft with an impeller are arranged in the flow channel, a rear end of the transmission shaft is rotatably connected to the shell through a rear bearing, and a front end of the transmission shaft is transmission-connected to the motor through a coupling, wherein the front portion of the shell is provided with an open coupling accommodating cavity in which a coupling is arranged, a mounting hole for docking the flow channel and the coupling accommodating cavity is arranged on the shell, the motor is fixedly connected to the open end of the coupling accommodating cavity to cover the open end, a motor shaft for outputting power from the motor extends into the coupling accommodating cavity to connect to the coupling, the front end of the transmission shaft passes through the mounting hole to connect to the coupling, the front portion of the transmission shaft is rotatably connected to the mounting hole through the front bearing, a first waterproof seal and a second waterproof seal for rotating seal are arranged on the transmission shaft, and the first waterproof seal and the second waterproof seal respectively prevent water from flowing into the front bearing and the rear bearing in the front and rear directions along the transmission shaft. The utility model can provide better protection for the coupling, and only two waterproof seals need to be set along the transmission shaft, simplifying the transmission sealing structure of the propeller; because the transmission loss caused by the waterproof seal is also significantly reduced, the propeller has higher working efficiency; and the motor and the housing are closely adjacent, and the overall structure of the propeller is more compact. The waterproof protection of the coupling is achieved through a special accommodating cavity, and the motor is fixed to the open end of the accommodating cavity to cover the open end, forming a closed space to protect the coupling; the bearings for positioning and installing the transmission shaft are only at the front and rear bearings, and only the first and second waterproof seals need to be set on the corresponding transmission shaft to prevent water from flowing into the front and rear bearings along the transmission shaft in the front and rear directions.

[0005] As a further improvement and supplement to the above technical scheme, the utility model adopts the following technical measures: the outer shell includes a hollow main shell and a cylindrical guide shell connected front and rear, the flow channel is composed of the cavity of the main shell and the cylindrical cavity of the guide shell connected, the water inlet and the mounting channel are respectively arranged on the bottom surface of the main shell and in the main shell, the injection port is open at the rear end of the cylindrical cavity, and an axially extending guide pipe seat is provided in the center of the cylindrical cavity, a plurality of guide blades are arranged around the cylindrical cavity, and the two ends of the guide blades are respectively fixed to the guide pipe seat and the cylindrical cavity side wall of the guide shell, the rear end of the transmission shaft passes through the impeller and is inserted into the tube cavity of the guide pipe seat from the front end opening of the guide pipe seat, the rear end of the guide pipe seat is closed, the rear bearing is arranged between the transmission shaft and the inner wall of the tube cavity, the first waterproof seal and the second waterproof seal are respectively arranged in the mounting channel on the rear side of the front bearing and on the transmission shaft on the front side of the rear bearing. The outer shell of the propeller is spliced ​​from two sections, front and rear, which can facilitate the assembly of the internal transmission shaft, impeller, etc.; the guide blades are located in the guide shell of the rear section and are fixed to the inner wall of the guide shell and the guide pipe seat, and the three can be formed as one piece through casting; the transmission shaft passes through the impeller and is inserted into the guide pipe seat, and is installed and positioned by the rear bearing arranged in the guide pipe seat; the rear end of the guide pipe seat is closed, so the waterproof seal to protect the rear bearing only needs to be on the front side of the guide pipe seat to prevent water from flowing backward along the transmission shaft into the rear bearing in the guide pipe seat; the waterproof seal to protect the front bearing is arranged in the mounting channel set on the main shell and is located on the rear side of the front bearing.

[0006] A guide vane rear end cover is fixedly connected to the rear end of the guide pipe seat to form the rear end closure. The guide vane rear end cover is screwed into a screw hole set at the rear end of the guide pipe seat and is sealed by a second rubber ring. The screw hole is connected to the pipe cavity forward, and the second rubber ring is pressed between the guide vane rear end cover and the inner wall of the screw hole.

[0007] The cylindrical cavity forms a first diameter-reducing portion that shrinks backward at the end surface of the guide shell connected to the main shell; the cylindrical cavity is provided with a second diameter-reducing portion that expands backward at the middle section, and the cylindrical cavity extends backward in an arc shape from the second diameter-reducing portion and shrinks in diameter. The shrinkage of the first diameter-reducing portion along the direction of the water flow makes the water flow channel suddenly narrow, reduces the water flow resistance, and has an acceleration effect on the water flow; the expansion of the second diameter-reducing portion along the direction of the water flow makes the water flow channel suddenly widen, and then accelerates through the cylindrical cavity that gradually shrinks and becomes smaller, and finally ejects from the jet port to push the surfboard forward.

[0008] A water inlet hole is provided on the side wall of the cylinder cavity between the guide vane and the injection port, and the water inlet hole is connected to a cooling pipeline arranged in the motor through a pipeline. The water inlet hole can introduce high-pressure water flow from the flow channel to cool the motor.

[0009] The second waterproof seal is arranged on the inner hole wall of an annular guide vane seal seat, the transmission shaft passes through the inner hole of the guide vane seal seat and is inserted into the guide pipe seat, the guide vane seal seat is plug-connected with the guide pipe seat and abuts against the rear bearing to position it in the guide pipe seat, the guide vane seal seat and the guide pipe seat are sealed by the first rubber ring, and the second waterproof seal is formed between the inner hole wall of the guide vane seal seat and the transmission shaft passing through. The transmission shaft passes through the guide vane seal seat and is inserted into the guide pipe seat, and the second waterproof seal forms a seal between the transmission shaft and the inner hole wall of the guide vane seal seat, so that water cannot pass through the gap between the transmission shaft and the guide vane seal seat, and at the same time, the guide vane seal seat and the guide pipe seat are plug-connected and sealed with the first rubber ring, so that water cannot flow in from the gap between the guide vane seal seat and the guide pipe seat.

[0010] The inner hole wall of the guide vane seal seat is provided with a rear installation groove that is continuous along the circumference, and the second waterproof seal is a rear sealing ring embedded in the rear installation groove, and the rear sealing ring is clamped between the rear installation groove and the second clamping ring along the axial direction, and the second clamping ring is embedded in the embedding groove opened on the inner hole wall of the guide vane seal seat. The rear sealing ring as the second waterproof seal is installed in the installation groove on the inner hole wall of the guide vane seal seat, and is clamped and fixed by one end of the installation groove and the second clamping ring.

[0011] The first waterproof seal is a front sealing ring embedded in the inner wall of the installation channel, and the front sealing ring is axially clamped between a front installation groove and a positioning retaining ring provided on the inner wall of the installation channel, and the positioning retaining ring is limitedly provided on the inner wall of the installation channel. The first waterproof seal is a sealing ring, and is positioned by the joint action of the installation groove and the positioning retaining ring.

[0012] The transmission shaft is provided with a thrust ring to press against the impeller. The thrust ring is sleeved on a step portion formed by a diameter change on the transmission shaft. The thrust ring is pressed between the step portion and the impeller. The impeller is pressed between the thrust ring and the first clamp ring. The first clamp ring is embedded in the positioning groove provided on the transmission shaft. The thrust ring is pressed between the transmission shaft and the impeller to bear the axial thrust generated when the impeller is working, so as to avoid the axial thrust being directly applied to the transmission shaft to affect the transmission shaft. Under the premise of not being affected by the axial thrust, the outer diameter of the transmission shaft can be made smaller, and the thin transmission shaft has less obstruction to the driving water flow. At the same time, the impeller is pressed against the limit position on the transmission shaft through the thrust rings on both sides and the embedded first clamp ring.

[0013] The coupling is wrapped with an elastic rubber sleeve, and the openings at both ends of the rubber sleeve are used to insert the motor shaft and the transmission shaft respectively. The elastic rubber sleeve tightly wraps the coupling, which can pre-tighten the connection between the motor shaft, the transmission shaft and the coupling, and can buffer the vibration impact and the impact noise generated when the coupling runs at a high speed.

[0014] The utility model simplifies the internal waterproof seal, especially only two waterproof seals are required at the front and rear ends of the transmission shaft, thereby reducing the transmission loss caused by the waterproof seal, improving the efficiency of the propeller, and making the overall structure of the propeller more compact; the coupling is also arranged in a specially designed closed accommodating cavity for better protection, and a rubber sleeve is also arranged outside the coupling to reduce vibration impact during operation and reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : The utility model overall schematic diagram.

[0016] Figure 2 : A top view of the utility model.

[0017] Figure 3 : Figure 2 AA section view.

[0018] Figure 4 : Figure 3 Enlarged view of part B.

[0019] Figure 5 : Figure 3 Enlarged view of part C.

[0020] Figure 6 : Figure 3 Enlarged view of part D.

[0021] In the figure: 1-1. Guide vane sealing seat, 1-2. Guide vane rear end cover, 1-3. First rubber ring, 1-4. Second rubber ring (install the rear end cover), 1-5. First clamp ring, 1-6. Second clamp ring, 1-7. Bearing spacer, 1-8. Thrust retaining ring, 2. Impeller, 2-1. Blade, 2-2. Impeller inner pipe seat, 2-3. Impeller outer pipe seat, 3. Transmission shaft, 4. Water inlet, 5. Converging pipe, 6. Diverter pipe, 7. Guide shell, 7-1. Cylinder cavity side wall, 7-2. Guide pipe seat, 7-3. Guide vane, 7-4. First reducer, 7-5. Second reducer, 8. Third rubber ring, 9. Rubber sleeve , 10. Fourth rubber ring, 11. Fifth rubber ring, 12. Motor bearing, 13. Motor housing, 14. Motor stator, 15. Motor rotor, 16. Motor shaft, 17. Coupling, 18. Main housing, 18-1. Mounting part, 19. Front bearing, 20. Coupling accommodating cavity, 21. First waterproof seal, 22. Second waterproof seal, 23. Thrust ring, 24. Fastening screw, 25. Motor, 26. Injection port, 27. Positioning retaining ring, 28. Water inlet hole, 29. Rear bearing, 29-1. Deep groove ball bearing, 29-2. Angular contact bearing, 30. Mounting channel, 31. Wave washer. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figures 1 to 6 As shown, the utility model is an electric surfboard propeller, including a housing with a flow channel, a coupling 17 and a motor 25, the bottom and tail end of the housing are respectively provided with a water inlet 4 and a jet port 26 connected to the flow channel, wherein the motor 25 includes an outermost sealed motor housing 13 and a motor stator 14, a motor rotor 15 and a motor shaft 16 arranged inside the motor housing 13, the motor shaft 16 is rotatably connected to the motor housing 13 through a motor bearing 12, a plurality of guide blades 7-3 and a transmission shaft 3 with an impeller 2 are arranged in the flow channel, and the impeller 2 is provided with an impeller inner portion at the center. The pipe seat 2-2 and the blades 2-1 on the front and rear sides thereof are composed of the impeller outer pipe seat 2-3 and the three are an integrated structure. The blades 2-1 and the inner wall of the flow channel cavity are clearance-matched. The rear end of the transmission shaft 3 is rotatably connected to the housing through the rear bearing 29. The front end of the transmission shaft 3 is connected to the motor 25 through the coupling 17. The front part of the housing is provided with an open coupling accommodating chamber 20 for accommodating the coupling 17. The housing is provided with a mounting hole 30 for docking the flow channel and the coupling accommodating chamber 20. The motor 25 is fixedly connected to the open end of the coupling accommodating chamber 20 to cover the open end. Figure 4 The motor housing 13 and the open end of the coupling accommodating cavity are sealed by the fourth rubber ring 10, the motor shaft 16 extends into the coupling accommodating cavity 20 to connect the coupling 17, the front end of the transmission shaft 3 passes through the mounting hole 30 to connect the coupling 17, the front part of the transmission shaft 3 is rotatably connected to the mounting hole 30 through the front bearing 19, and the fifth rubber ring 11 is also arranged between the front bearing 19 and the side wall of the mounting hole 30 to improve the positioning effect and to reduce shock, and the transmission shaft 3 is provided with a first waterproof seal 21 and a second waterproof seal 22 for rotating sealing, and the first waterproof seal 21 and the second waterproof seal 22 respectively prevent water from flowing into the front bearing 19 and the rear bearing 29 along the transmission shaft 3 in the front and rear directions. In addition, the coupling 17 is wrapped with an elastic rubber sleeve 9, and the openings at both ends of the rubber sleeve 9 are used to penetrate the motor shaft 16 and the transmission shaft 3 respectively.

[0024] The utility model has better protection for the coupling. The waterproof protection of the coupling is achieved through a special accommodating cavity, and the motor is fixed to the open end of the accommodating cavity to cover the open end, forming a closed space to protect the coupling. The motor housing and the outer shell are closely adjacent to each other, and the overall structure of the propeller is more compact. Only the first and second waterproof seals need to be set on the transmission shaft to prevent water from flowing into the front and rear bearings along the transmission shaft in the front and rear directions, thereby simplifying the overall transmission sealing structure of the propeller, reducing the transmission loss caused by multiple waterproof seals, and making the propeller more efficient.

[0025] Further, the shell includes a hollow main shell 18 and a cylindrical guide shell 7 connected front and back, the flow channel is formed by connecting the cavity of the main shell 18 and the cylindrical cavity of the guide shell 7, the main shell 18 has four mounting parts 18-1 that can be penetrated by bolts at the front and back of the bottom, which are used for mounting and fixing with the surfboard body, the water inlet 4 and the mounting channel 30 are respectively arranged on the bottom surface of the main shell 18 and in the main shell 18, the injection port 26 is open at the rear end of the cylindrical cavity, the center of the cylindrical cavity is provided with an axially extending guide pipe seat 7-2, the guide blade 7-3 is arranged around the cylindrical cavity, and the inner and outer ends of each guide blade 7-3 are respectively connected to the guide pipe seat 7-2 and the guide shell 7. 7 is fixedly connected to the side wall 7-1 of the cylinder cavity, where the side wall of the cylinder cavity and the guide pipe seat and the guide vane are an integrally formed structure. The rear end of the transmission shaft 3 passes through the impeller 2 and is inserted into the tube cavity of the guide pipe seat 7-2 from the front end opening of the guide pipe seat 7-2. The rear end of the guide pipe seat 7-2 is closed, and the rear end closure is formed by a guide vane rear end cover 1-2 fixedly connected to the rear end of the guide pipe seat 7-2. The guide vane rear end cover 1-2 is screwed into the screw-on hole set at the rear end of the guide pipe seat 7-2 and is sealed by the second rubber ring 1-4. The screw-on hole is connected to the tube cavity of the guide pipe seat 7-2 forward, and the second rubber ring 1-4 is pressed between the guide vane rear end cover 1-2 and the inner wall of the screw-on hole.

[0026] like Figure 3 and Figure 4 and Figure 5 As shown, the rear bearing 29 is arranged between the transmission shaft 3 and the inner wall of the tube cavity, and the first waterproof seal 21 and the second waterproof seal 22 are respectively arranged in the mounting channel 30 on the rear side of the front bearing 19 and on the transmission shaft 3 on the front side of the rear bearing 29. The first waterproof seal 21 is a front sealing ring embedded in the inner wall of the mounting channel 30, and the front sealing ring is clamped axially between the front mounting groove set on the inner wall of the mounting channel 30 and a positioning retaining ring 27, and the positioning retaining ring 27 is limitedly set on the inner wall of the mounting channel 30. Figure 4 As shown, a wave washer 31 is also provided between the positioning retaining ring 27 and the front bearing 19. The function of the wave washer is to pre-tighten the axial direction and absorb the axial movement during the operation of the propeller.

[0027] The second waterproof seal 22 is arranged on the inner hole wall of an annular guide vane seal seat 1-1, and the transmission shaft 3 passes through the inner hole of the guide vane seal seat 1-1 and is inserted into the guide pipe seat 7-2. The guide vane seal seat 1-1 is plugged and connected with the guide pipe seat 7-2 and abuts against the rear bearing 29 to position it in the guide pipe seat 7-2. The rear bearing 29 of this embodiment is as shown in FIG. Figure 5As shown, it is composed of a deep groove ball bearing 29-1 and an angular contact bearing 29-2, the two bearings are separated by a bearing spacer 1-7, one side of the angular contact bearing 29-2 is positioned by a thrust retaining ring 1-8 fixed to the rear end face of the transmission shaft 3, the thrust retaining ring 1-8 is locked and fixed to the rear end of the transmission shaft 3 by a fastening screw 24, and one side of the deep groove ball bearing 29-1 is positioned by a guide vane sealing seat 1-1; the guide vane sealing seat 1-1 and the guide pipe seat 7-2 are sealed and connected by a first rubber ring 1-3, and a second waterproof seal 22 is formed between the inner hole wall of the guide vane sealing seat 1-1 and the penetrating transmission shaft 3, and a rear mounting groove continuous along the circumference is provided on the inner hole wall of the guide vane sealing seat 1-1, and a rear sealing ring is embedded as the second waterproof seal 22, and the rear sealing ring is clamped axially between the rear mounting groove and the second clamping ring 1-6, and the second clamping ring 1-6 is embedded in the embedded groove opened on the inner hole wall of the guide vane sealing seat 1-1.

[0028] like Figure 6 As shown, the guide shell 7 and the main shell 18 are sealed and connected by the third rubber ring 8, the rear end of the main shell 18 is sleeved on the front end of the guide shell 7, and the third rubber ring is pressed tightly in the positioning groove set on the outer edge of the front end of the guide shell 7; the cylindrical cavity of the guide shell 7 also forms a first reducing portion 7-4 that shrinks backward at the end surface position where the guide shell 7 connects to the main shell 18; the cylindrical cavity is provided with a second reducing portion 7-5 that expands backward at the middle position, and the cylindrical cavity extends backward in an arc shape from the second reducing portion 7-5 and shrinks in diameter.

[0029] like Figures 1 to 3 As shown, a water inlet hole 28 is also provided on the cylinder cavity side wall 7-1 between the guide blade 7-3 and the injection port 26. The water inlet hole 28 is connected to the cooling pipeline arranged in the motor 25 through a pipeline. In order to facilitate the introduction of high-pressure water flow to cool the motor, in this embodiment, two water inlet holes 28 are symmetrically arranged on the cylinder cavity side wall 7-1, and each water inlet hole is connected to a shunt pipe 6. The other ends of the two shunt pipes are connected to the same confluence pipe 5, and the confluence pipe 5 is connected to the cooling pipeline inside the motor.

[0030] like Figure 3 and Figure 5 As shown, a thrust ring 23 is also provided on the transmission shaft 3 to abut against the impeller 2. The thrust ring 23 is sleeved on a step portion formed by a diameter change on the transmission shaft 3. The thrust ring 23 is pressed tightly between the step portion and the impeller 2. The impeller 2 is pressed tightly between the thrust ring 23 and the first clamp ring 1-5. The first clamp ring 1-5 is embedded in the positioning groove provided on the transmission shaft 3. The thrust ring is used to bear the axial thrust generated when the impeller is working, to avoid the axial thrust being directly applied to the transmission shaft to cause adverse effects, and at the same time to make it possible to reduce the outer diameter of the transmission shaft. When the outer diameter of the transmission shaft is reduced, the resistance to the water flow will be significantly reduced.

Claims

1. An electric surfboard propeller, comprising a housing with a flow channel, a coupling (17) and a motor (25), wherein a water inlet (4) and a jet port (26) communicating with the flow channel are respectively arranged at the bottom and the tail end of the housing, a plurality of guide blades (7-3) and a transmission shaft (3) with an impeller (2) are arranged in the flow channel, a rear end of the transmission shaft (3) is rotatably connected to the housing through a rear bearing (29), and a front end of the transmission shaft (3) is transmission-connected to the motor (25) through the coupling (17), wherein the characteristics are as follows: The front part of the housing is provided with an open coupling accommodating chamber (20) for accommodating the coupling (17); the housing is provided with a mounting hole (30) for connecting the flow channel and the coupling accommodating chamber (20); the motor (25) is fixedly connected to the open end of the coupling accommodating chamber (20) to cover the open end; the motor shaft (16) for outputting power of the motor (25) extends into the coupling accommodating chamber (20) to connect with the coupling (17); the front end of the transmission shaft (3) passes through the mounting hole (30) to connect with the coupling (17); the front part of the transmission shaft (3) is rotatably connected with the mounting hole (30) through the front bearing (19); the transmission shaft (3) is provided with a first waterproof seal (21) and a second waterproof seal (22) for rotating sealing; the first waterproof seal (21) and the second waterproof seal (22) respectively prevent water from flowing into the front bearing (19) and the rear bearing (29) along the transmission shaft (3) in the front and rear directions.

2. The electric surfboard propeller according to claim 1, characterized in that The shell comprises a hollow main shell (18) and a cylindrical guide shell (7) connected front and rear, the flow channel is formed by connecting the cavity of the main shell (18) and the cylindrical cavity of the guide shell (7), the water inlet (4) and the installation channel (30) are respectively arranged on the bottom surface of the main shell (18) and inside the main shell (18), the injection port (26) is open at the rear end of the cylindrical cavity, the center of the cylindrical cavity is provided with an axially extending guide pipe seat (7-2), a plurality of guide blades (7-3) are arranged around the cylindrical cavity, and the two ends of the guide blades (7-3) are respectively fixedly connected to the guide pipe seat (7-2). The flow pipe seat (7-2) and the cylindrical cavity side wall (7-1) of the guide shell (7), the rear end of the transmission shaft (3) passes through the impeller (2) and is inserted into the tube cavity of the flow pipe seat (7-2) from the front end opening of the flow pipe seat (7-2), the rear end of the flow pipe seat (7-2) is closed, the rear bearing (29) is arranged between the transmission shaft (3) and the inner wall of the tube cavity, and the first waterproof seal (21) and the second waterproof seal (22) are respectively arranged in the installation channel (30) on the rear side of the front bearing (19) and on the transmission shaft (3) on the front side of the rear bearing (29).

3. The electric surfboard propeller according to claim 2, characterized in that The rear end of the guide pipe seat (7-2) is fixedly connected to a guide vane rear end cover (1-2) to form the rear end closure; the guide vane rear end cover (1-2) is screwed into a screw connection hole provided at the rear end of the guide pipe seat (7-2) and is sealed by a second rubber ring (1-4); the screw connection hole is connected to the pipe cavity forward, and the second rubber ring (1-4) is pressed between the guide vane rear end cover (1-2) and the inner wall of the screw connection hole.

4. The electric surfboard propeller according to claim 2, characterized in that The cylindrical cavity forms a first diameter-reducing portion (7-4) that shrinks backwards at the end surface of the guide shell (7) connected to the main shell (18); a second diameter-reducing portion (7-5) that expands backwards is provided at the middle section of the cylindrical cavity, and the cylindrical cavity extends backwards in an arc shape from the second diameter-reducing portion (7-5) and shrinks in diameter.

5. The electric surfboard propeller according to claim 2, characterized in that A water inlet hole (28) is provided on the side wall (7-1) of the cylinder cavity between the guide blade (7-3) and the injection port (26), and the water inlet hole (28) is connected to a cooling pipeline provided in the motor (25) through a pipeline.

6. The electric surfboard propeller according to claim 2, characterized in that The second waterproof seal (22) is arranged on the inner hole wall of an annular guide vane seal seat (1-1); the transmission shaft (3) passes through the inner hole of the guide vane seal seat (1-1) and is inserted into the guide pipe seat (7-2); the guide vane seal seat (1-1) is plug-connected with the guide pipe seat (7-2) and abuts against the rear bearing (29) so that it is positioned in the guide pipe seat (7-2); the guide vane seal seat (1-1) and the guide pipe seat (7-2) are sealed and connected via a first rubber ring (1-3); and the second waterproof seal (22) is formed between the inner hole wall of the guide vane seal seat (1-1) and the penetrating transmission shaft (3).

7. The electric surfboard propeller according to claim 6, characterized in that A rear installation groove which is continuous along the circumference is provided on the inner hole wall of the guide vane seal seat (1-1); the second waterproof seal (22) is a rear sealing ring embedded in the rear installation groove; the rear sealing ring is clamped axially between the rear installation groove and the second clamping ring (1-6); the second clamping ring (1-6) is embedded in the embedding groove provided on the inner hole wall of the guide vane seal seat (1-1).

8. The electric surfboard propeller according to claim 1, characterized in that The first waterproof seal (21) is a front sealing ring embedded in the inner wall of the installation channel (30), and the front sealing ring is axially clamped between a front installation groove provided on the inner wall of the installation channel (30) and a positioning retaining ring (27), and the positioning retaining ring (27) is limitedly provided on the inner wall of the installation channel (30).

9. The electric surfboard propeller according to claim 1, characterized in that A thrust ring (23) is arranged on the transmission shaft (3) to abut against the impeller (2); the thrust ring (23) is sleeved on a step portion formed by a diameter change on the transmission shaft (3); the thrust ring (23) is tightly pressed between the step portion and the impeller (2); the impeller (2) is tightly pressed between the thrust ring (23) and a first clamping ring (1-5); and the first clamping ring (1-5) is embedded in a positioning groove provided on the transmission shaft (3).

10. The electric surfboard propeller according to claim 1, characterized in that The coupling (17) is wrapped with an elastic rubber sleeve (9), and the openings at both ends of the rubber sleeve (9) are used to penetrate the motor shaft (16) and the transmission shaft (3) respectively.

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