A two-stage propeller for ships

Abstract

A two-stage propeller for ships relates to a ship propeller, which comprises a front engine, a rear engine, a front propeller, a rear propeller and a square tube casing. The front propeller is mounted on the output shaft of the front engine, and the rear propeller is mounted on the output shaft of the rear engine. The diameters of the front propeller and the rear propeller are equal, and they are arranged inside the square tube shell one after the other. The forward angle between the rotation plane of the front propeller and the left plate of the square tubular shell is no more than 80°. The rearward angle between the rotation plane of the rear propeller and the left plate of the square tubular shell is no more than 80°. The planes of rotation of both the front and rear propellers are perpendicular to the top and bottom plates of the square tubular housing. Driven by the front engine and the rear engine respectively, the front propeller and the rear propeller rotate in the square tubular shell, sucking the water in the front into the square tubular shell and extruding it from the rear of the square tubular shell. Compared with traditional ship propellers, it has large thrust, low resistance and high efficiency.

Description

technical field [0001] A two-stage propeller for ships relates to a ship propeller, in particular to a two-stage ship propeller. Background technique [0002] The traditional barreled propeller propeller is cylindrical, the rotation plane of the blade is perpendicular to the opening direction of the shell, the cross-sectional area is large, and the resistance is relatively large, especially at high speed. Due to the use of a single propeller, the thrust generated Small, poor stability; the traditional two-stage propeller has high resistance, large interference between the two propellers, and low efficiency. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a two-stage propeller for ships with less resistance and greater thrust. [0004] The technical solution of the present invention is: a two-stage propeller for ships, which includes a front engine, a rear engine, a fro...

AI Technical Summary

Problems solved by technology

[0002] The traditional barreled propeller propeller is cylindrical, the rotation plane of the blade is perpendicular to the opening direction of the casing, the cross-sectional area is large, and the resistance is relatively large, especially at high speed. Due to the use of a single propeller, the thrust generated Small, poor stability; traditional two-stage propellers, large resistance, large interference between the two propellers, low efficiency

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