A scientific research ship with a pod type electric propulsion system

Abstract

The invention discloses a scientific research ship with a podded electricity propulsion system. A podded thruster which is connected with a power output control system and internally provided with a synchronous motor is arranged below the stern of a hull, a propeller which is coaxially connected with a rotary shaft of the synchronous motor is arranged on the outer side of the housing of a pod, anda telescopic mechanism which is used for driving blades to extend outwards in the diameter direction of the hub and a power mechanism which is used for driving the actuation of the telescopic mechanism are arranged on the hub. The rotation rate of the propeller is monitored in real time to drive the telescopic mechanism to control the stretching amount of the blades according to the need of the actual speed of the hull. The scientific research ship has the advantages that the propulsion force of the propeller is changed by changing the diameter of the propeller, electricity cost is reduced, the overall service life of the electricity propulsion system is prolonged, vacuoles are prevented, the magnitude of the propulsion force of the propeller is changed by changing the effective diameterof the propeller and the area of a propeller disc, the constant changing of propulsion force of the propeller is achieved, and more energy is saved.

Description

technical field [0001] The invention relates to the technical field of ship equipment, in particular to a scientific research ship with a pod type electric propulsion system. Background technique [0002] The full name of the pod-type electric propulsion system is "permanent magnet motor pod-type full-rotation rudderless propulsion electric propulsion system". Its propulsion motor is not in the hull but underwater, integrated with the propeller, and has no rudder. The entire pod-type propeller can rotate 360° horizontally, just like the vector nozzle used by modern military aircraft engines, the direction of navigation can be adjusted by rotating the direction of the pod, not only can move forward and backward freely, but also can complete "lateral movement Various "difficult movements" such as "turning in place" and "turning in place" have greatly improved the maneuverability and maneuverability of the ship. This propulsion method has high energy conversion efficiency bec...

AI Technical Summary

Problems solved by technology

However, the principle of cavitation is the instantaneous high-speed flow of liquid. The high-speed flow of liquid is caused by the high-speed rotation of the propeller. Therefore, in order to solve the problem of cavitation, it is necessary to reduce the critical speed of cavitation in the propeller, but this is a contradiction. The problem is that if the propeller speed is low, the speed required by the ship cannot be reached, and if the speed is high, cavitation cannot be avoided.

Since the propeller works in the uneven flow field behind the ship, the uneven flow field of seawater causes the thrust and torque generated by the propeller to fluctuate periodically, that is to say, the pulsating force acting on the blade is not a constant Therefore, the propeller capable of changing the diameter and pitch disclosed by CN 105620728A and the propeller capable of changing the diameter of the propeller disclosed by CN 104943853A are adopted, which control the diameter of the propeller according to the centrifugal force of the blade itself. These two technical solutions rely on centrifugal force The self-driving method cannot achieve true propeller diameter reduction, cannot obtain stable propulsion, and cannot solve the cavitation problem caused by changing the propeller diameter to compensate for excessive speed

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