Oppositely-rotating shaft-less rim-driven propeller

Abstract

The invention discloses an oppositely-rotating shaft-less rim-driven propeller which is provided with a guide tube component, wherein a stator winding, a front rotor component and a rear rotor component are arranged in the inner cavity of a shell; rotor rings in the two rotor components form a conical matching pair in an axial direction, and the polarities of permanent magnets embedded into the outer walls of the two rotor rings are opposite; and after the stator winding is electrified, the stator winding and the permanent magnets simultaneously form magnetic fields with opposite magnetic properties, namely that one stator drives two rotors to rotate to form a dual-rotor annular motor, thereby driving a front paddle and a rear paddle to rotate oppositely so as to generate thrust for pushing a ship to move forwards. The propeller disclosed by the invention has the advantages of small occupied space, high propulsion efficiency, large thrust, good transverse stability, small vibration and the like, and is particularly suitable for propelling of military boats and ships and modern civil ships as well as positioning of offshore platforms.

Description

technical field [0001] The invention belongs to the field of ship propulsion, in particular to a new type of propulsion with high efficiency, high thrust, good stability and high integration formed by simultaneously driving a hubless double rotor with blades to rotate counter-rotatingly by a single stator in a conduit propellers, so-called counter-rotating shaftless rim drive propellers. Background technique [0002] In recent years, with the needs of naval defense construction and the development of water trade, the performance requirements of ship propulsion devices have become higher and higher. The disadvantages of traditional shaft-driven propellers have gradually become prominent, and they can no longer better meet the work requirements. For example, the traditional shaft-driven propeller has many components, complex structure, large cabin space, large energy loss, difficult vibration and noise control, high construction and maintenance costs, etc. These defects have l...

AI Technical Summary

Problems solved by technology

This hubless structure is beneficial to reduce resistance and solve the problem of debris or cable entanglement, but limited by the size of the motor, the power of the propeller is limited

Moreover, the thrust generated by the blades is generally borne by the water-lubricated dynamic pressure bearings at both ends of the rotor. The bearing area is limited by the thickness of the shell, and the bearing capacity is small, which also limits the development of high-power shaftless propellers.

The Chinese patent "Shaftless Driven Integrated Motor Propeller" (CN102632982A) is a single-rotor hub-type rim-driven propeller. Support the bearing and transmit thrust; although this structure is conducive to improving the bearing capacity of the bearing, it cannot eliminate the head-on resistance of the propeller hub and the hull

Although this structure is beneficial to reduce the rotation loss of the wake and improve the propulsion efficiency, it has obvious disadvantages such as complex shafting, difficult manufacturing, and high manufacturing and maintenance costs.

Moreover, there is a relatively obvious cavitation phenomenon at the tip of the counter-rotating propeller.

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