Counter-rotating shaftless rim drive propellers

Abstract

The invention discloses a counter-rotating shaftless rim-driven propeller. The propeller is provided with a conduit assembly, and a stator winding, a front rotor assembly, and a rear rotor assembly are installed in the inner chamber of the casing; the rotor in the two rotor assemblies is The ring forms a conical matching pair in the axial direction, and the permanent magnets embedded in the outer walls of the two rotor rings have opposite polarities; after the stator winding is energized, it forms a magnetically opposite magnetic field with the permanent magnets at the same time, that is, the single stator drives the double rotors to rotate, forming The double-rotor ring motor drives the front blade and the rear blade to rotate in opposite directions, generating thrust to propel the ship forward. The invention has the advantages of small space occupation, high propulsion efficiency, large thrust, good lateral stability, small vibration, etc., and is especially suitable for propulsion of military ships and modern civil ships and 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 duct 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 led ...

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.

Images