Underwater propeller and submersible

1. An underwater propeller, comprising:

a housing having a cylindrical structure with two open ends,

a stator sleeve having a cylindrical structure with one open end, the stator sleeve suspended in an internal cavity of the housing, an interval disposed between an outer wall of the stator sleeve and an inner wall of the housing,

a motor stator fixed inside the stator sleeve,

a rotor sleeve having a cylindrical structure with one open end and disposed on the stator sleeve, a gap disposed between an inner wall of the rotor sleeve and an outer wall of the stator sleeve, the rotor sleeve rotationally connected with the stator sleeve, an bottom of the rotor sleeve rotationally connected with the housing,

a motor rotor fixed to the inner wall of the rotor sleeve, and

a propeller fixed to the outer wall of the rotor sleeve, maximum diameter of the propeller smaller than inner diameter of the housing.

2. The underwater propeller of claim 1 , wherein a first bearing is disposed between the inner wall of the rotor sleeve and the outer wall of the stator sleeve.

3. The underwater propeller of claim 1 , wherein the housing comprises:

a cylinder having a cylindrical structure with two open ends, and coaxial with the housing,

a mounting base having an annular structure coaxial with the cylinder and an outer wall of the annular structure of the mounting base fixed to an inner wall of the cylinder through a plurality of supporting members,

a support frame, which is two concentric rings connected through a plurality of support rods, the support frame fixed at an opening position at one end of the cylinder and disposed with a support hole which is coaxial with the cylinder.

4. The underwater propeller of claim 3 , wherein the opening of the stator sleeve is sealingly fixed with the end face of the mounting base,

the rotor sleeve has a consistent opening direction with the stator sleeve and is coaxial with the stator sleeve.

5. The underwater propeller of claim 3 , wherein the underwater propeller further comprises:

a convex shaft arranged on the outer wall of the bottom of the rotor sleeve and coaxial with the rotor sleeve, and

a second bearing arranged in the support hole in which the convex shaft is rotatably arranged in a support hole on the support frame through the second bearing.

6. The underwater propeller of claim 1 , wherein the underwater propeller further comprises:

a first seal sealingly fixed to the inner wall of the mounting base to seal the space between the stator sleeves.

7. The underwater propeller of claim 6 , wherein the underwater propeller further comprises:

a circuit board located in an internal cavity of the mounting base,

a cable, of which one end is connected with the circuit board, and the other end is connected with the motor stator through the first seal, wherein a space between the cable and the first seal is sealed, and

a second seal located at an open position of one end of the mounting base away from the stator sleeve and used for sealing the internal cavity of the mounting base.

8. The underwater propeller of claim 3 , wherein the underwater propeller further comprises:

an end cover, which is two concentric rings connected through a plurality of support rods, and fixed at an opening position of one end of the cylinder away from the support frame.

9. The underwater propeller of claim 8 , wherein the support frame and the end cover are both fixed to the cylinder through threaded connection.

10. The underwater propeller of claim 1 , wherein the inner wall of the stator sleeve is disposed with a plurality of convex ribs,

external diameter of the motor stator is matched with the inner wall of the stator sleeve, and a plurality of grooves matching with the convex ribs are arranged on the outer wall of the motor stator for fixing the motor stator in the stator sleeve.

11. The underwater propeller of claim 1 , wherein pitch of the propeller is 100 mm to 135 mm.

12. A submersible comprising an underwater propeller of claim 1 .