Composite propeller hub cap for reducing swirling flow and hub vortex and improving propulsion efficiency

Abstract

The present invention relates to a propeller cap structure. The present invention discloses a composite propeller cap for reducing swirling flow and propeller hub vortex and improving propulsion efficiency and having guide fins. The problem of the existing PBCF (Propeller Boss Cap Fin) which increases the manufacturing difficulty and causes the production cost to be increased due to precision machining, the present invention discloses a method of combining a diffusion type (contraction type) propeller hub cap end on the existing contraction type (contraction type) Diffusion type) propeller hub cap to reduce the hub vortex cavitation occurred in the rear of the propeller composite type propeller hub cap, and, by virtue of the constriction part of the propeller cap or between the constriction part and the diffusion part set plate (plate) form guide fin (guide fin) to further reduce the occurrence of hub vortex cavitation.

Description

technical field [0001] The present invention relates to a structure of a propeller cap, more specifically, the present invention relates to a composite propeller cap for reducing swirling flow and propeller hub vortex and improving propulsion efficiency, which is used as a ship The hub vortex cavitation that occurs behind the propeller used by the propeller is reduced to reduce the noise and vibration of the ship, prevent erosion and corrosion of the rudder, and improve propulsion efficiency to save fuel. [0002] Moreover, the present invention also relates to a composite propeller hub cap for reducing swirling flow and hub vortex and improving propulsion efficiency, in order to solve the following problems of the existing PBCF (Propeller Boss Cap Fin), that is, in the propeller hub The cap is provided with a plurality of small fins (fin) to reduce the vortex of the hub. Therefore, in order to design and manufacture the fins, precision machining is required, which increases t...

AI Technical Summary

Problems solved by technology

[0022] The present invention aims to solve the problems of the prior art as described above, so the purpose of the present invention is to provide a composite propeller hub cap for reducing the rotating flow and hub vortex and improving propulsion efficiency, in order to solve the existing The problem of PBCF (Propeller Boss Cap Fin) is that the propeller hub cap is equipped with multiple small fins to reduce hub vortex cavitation. Therefore, precision machining is required to design and manufacture fins, which increases the difficulty of manufacturing And cause the production cost to increase, this composite type propeller hub cap of the present invention reduces the propeller hub cap structure that occurs in the composite form of the diffusion type (diffusion type) propeller hub cap at the end of the existing contraction type (contraction type) propeller hub cap. The hub vortex cavitation behind the propeller can be easily fabricated at a very low cost by virtue of a much simpler structure than the existing PBCF

Images