Sealed rim propeller or generator

Abstract

The invention discloses a sealed rim propeller or generator, which comprises a stator and a rotor; the rotor is movably connected in end covers on the two sides of a shell through a bearing, and the stator is fixed on the shell and corresponds to the rotor; a rotating shaft in the rotor is of a hollow structure, and blades are fixed on the inner side; a sealing assembly is arranged on the side of the bearing; the sealing assembly comprises a concave pole and a convex pole, and one of the concave pole and the convex pole is fixed on the rotating shaft; the concave pole is of a ring structure,the outer side of the concave pole is provided with a permanent magnet, and the inner side of the concave pole is provided with a groove; the top of the convex pole is arranged in the groove, and a gap is formed between the convex pole and the groove; the gap is filled with magnetic fluid; the magnetic fluid is accumulated at the bottom of the groove under the action of a magnetic field provided by the magnetic pole on the inner side of the permanent magnet, and a U-shaped or V-shaped sealing belt is formed between the convex pole and the concave pole by utilizing the principle that the fluid is in static pressure balance in the U-shaped pipe. The invention provides a sealed rim propeller or generator which is good in sealing performance, low in friction coefficient and high in energy conversion rate by utilizing magnetofluid sealing.

Description

technical field [0001] The invention belongs to the field of energy conversion engineering machinery, and in particular relates to a sealed rim thruster or generator with good sealing performance and low friction coefficient. [0002] technical background [0003] With the development of marine engineering and water sports in recent years, the performance requirements for underwater propellers and generators are also getting higher and higher. However, traditional shaft-driven propellers and generators have many components, complex structures, and the occupation of transmission systems. Large space, large energy loss, difficulty in vibration and noise control, high construction and maintenance costs, etc. have been unable to better meet the work requirements. These defects have led people to gradually turn their attention to more advanced rim propellers and generators. [0004] Rim propellers and generators mainly include a stator and a rotor with a motor. The rotor is cylind...

AI Technical Summary

Problems solved by technology

[0003] With the development of marine engineering and water sports in recent years, the performance requirements for underwater propellers and generators are also getting higher and higher. However, traditional shaft-driven propellers and generators have many components, complex structures, and the occupation of transmission systems. Large space, large energy loss, difficult vibration and noise control, high construction and maintenance costs, etc. have been unable to better meet the work requirements. These defects have led people to gradually turn their attention to more advanced rim propellers and generators

[0004] Rim propellers and generators mainly include a stator and a rotor with a motor. The rotor is cylindrical, and the blades are built into the rotor. The magnetic poles in the rotor are evenly distributed on the radial circumference of the blades, and the stator is directly placed on the rotor. The outer ring of the blade corresponds to the rotor. After the power is turned on, the rotor is driven to drive the blade to rotate. This kind of propeller saves a lot of intermediate transmission parts and greatly improves the energy conversion efficiency. However, when operating underwater, in order to control the The beating of the air gap in the magnetic circuit of the motor ensures the stable output of the rotor power. The bearing that fixes the rotor requires extremely high rotation accuracy. At the same time, due to the axial force applied to the rotor when the blade is running, the bearing needs to have a strong axial load. At the same time, in order to prevent the entry of water and other impurities inside the propeller or generator, which will affect the operation of the bearing, stator and rotor, it is necessary to seal the movable parts of the propeller. The bearing is the main part of the existing supporting shaft. On the one hand, it reduces the friction coefficient during the movement of the rotor, ensures its rotation accuracy, and has a strong load-bearing capacity, but its underwater sealing performance is not ideal, and most of them are contact seals. This kind of sealing method friction The coefficient is large, which leads to a high power ratio of additional loss, and a large amount of heat is generated, which greatly affects the energy conversion efficiency of the propeller or generator

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