Contra rotating propeller driving device driven by magnetic bearing wheel flange type motor

Abstract

The invention relates to a contra rotating propeller driving device driven by a magnetic bearing wheel flange type motor. The contra rotating propeller driving device mainly comprises a positive-rotating wheel flange type motor, a reverse-rotating wheel flange type motor, a positive-rotating propeller and a reverse-rotating propeller. The positive-rotating wheel flange type motor is connected with the positive-rotating propeller. The reverse-rotating wheel flange type motor is connected with the reverse-rotating propeller. The two wheel flange type motors are connected in series front and back, the rotating directions of the two propellers are opposite, and thrust of the same directions is generated. The propeller arranged at the back absorbs energy of a tailing vortex of the front propeller, and the overall propulsion efficiency and thrust are improved.

Description

technical field [0001] The invention belongs to the technical field of ship drive devices, in particular to a counter-rotating propeller drive device driven by a rim type motor, in particular to a counter-rotation propeller drive device driven by a magnetic bearing rim type motor. Background technique [0002] The so-called counter-rotating propellers are on the propulsion axis of the propellers. There are two propellers arranged one behind the other. Under the same power, the thrust generated is greater and the efficiency is higher, which is of great significance in the energy saving of ship propulsion. In the traditional counter-rotating propeller, from the prime mover to the propeller, it must go through the reduction gear. Usually, one reduction gear drives two driven gears to produce opposite rotation directions, and the two driven gears drive a shaft respectively. It has a propeller on it. The two drive shafts form the type of sleeve shaft. The outer one is a hollow ...

AI Technical Summary

Problems solved by technology

[0003] Problems existing in traditional counter-rotating propellers: the seal is prone to failure, causing oil leakage or water ingress; the dynamic seal between the two drive shafts, due to the relatively fast rotation speed, is often caused by assembly errors, shafting beating, sand wear, rubber Aging and other reasons cause seal failure, oil leakage or water ingress, damage to bearings and transmission mechanisms, and failure of propellers. The processing precision is high, the process is complicated, and the cost is high: in order to prevent damage to the propeller caused by dynamic seal failure, counter-rotating propellers The machining accuracy and assembly accuracy of the shaft system are very high. For example, the inner wall of the shaft hole must be finely ground to reduce the wear of the inner wall of the shaft hole and the seal and improve the sealing effect; high-precision bearings and precision-machined bearing seats must be used to reduce Shaft run out, improve sealing effect

At the same time, the transmission mechanism adopts high-precision gears, worm gears, etc., which require high machining accuracy and complex processes.

These measures have greatly increased the machining accuracy of the counter-rotating propeller and increased the cost, thus affecting the application of the counter-rotating propeller, and the propulsion efficiency is low: the motor and the propeller are driven by a gear pair, resulting in a loss of mechanical efficiency and reducing the transmission efficiency

The gear box and the davit that accommodate the shafting and gears are huge in size, which creates resistance in the water, further reducing the propulsion efficiency; the noise and vibration are large: the gear transmission generates vibration and causes noise, and secondly, after the water flows through the davit and the gear box, it generates Turbulent flow, the propeller vibrates in the turbulent flow, and causes cavitation, and the bursting of the cavitation generates noise; the structure is complex, heavy and bulky, and low reliability: the propulsion system includes gears, gearboxes, shafting, and various bearings And bearing seat, seal and seal seat, etc., the structure is complex, there are many parts, and the reliability is low

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