Sealed pod propeller

Abstract

The invention discloses a sealed pod propeller comprising a shell and a rotating shaft, the rotating shaft is movably connected into end covers on the two sides of the shell through bearings, a driving device installed in the shell provides power for rotation, a propeller is fixedly installed at the output end of the rotating shaft, and a sealing assembly is arranged on the side edge of a 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 has an annular 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 U-shaped or V-shaped gap is formed between the convex pole 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 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 high-performance sealed pod propeller which is good in sealing performance and low in friction coefficient by utilizing magnetofluid sealing.

Description

technical field [0001] The invention belongs to the field of energy conversion engineering machinery, in particular to a sealed pod propeller with good sealing performance and low friction coefficient. [0002] technical background [0003] The pod propeller is an advanced large-scale ship propulsion device. During the driving process, it can not only avoid the propeller from working in the complex turbulent flow of the stern, improve the propulsion efficiency of the ship, save energy and reduce emissions, but also significantly improve the ship's operational performance. If necessary, it can even turn the ship in situ, and can turn horizontally within 360° to achieve vector propulsion. Generally, it is mainly composed of a built-in drive module, a propeller module, a horizontal rotation mechanism and a cooling device. [0004] There are usually three driving methods for pod propellers, which are direct drive by underwater motor, drive by underwater oil motor, and drive by th...

AI Technical Summary

Problems solved by technology

[0004] There are usually three driving methods for pod propellers, which are direct drive by underwater motor, drive by underwater oil motor, and drive by the prime mover with the power source in the cabin through a spiral bevel gear pair. To ensure that the inside of the pod propeller is free from dust, Water and other impurities enter, and the active parts need to be sealed. As an important part of the supporting shaft, the bearing reduces the friction coefficient during the movement of the rotor and ensures its rotation accuracy, but it is insufficient in water sealing performance, especially during operation. In the process, in order to make up for the shortage, a sealing device is generally added to the outer side of the bearing, and the existing sealing device mostly adopts a contact seal, which has a large friction coefficient, which in turn leads to a low energy conversion rate of the motor, and the friction generates a large amount of harmful heat.

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