KR101302835B1

KR101302835B1 - Ship propulsion system using Freewheel clutch Turbine

Info

Publication number: KR101302835B1
Application number: KR1020100092740A
Authority: KR
Inventors: 김소연
Original assignee: 김소연
Priority date: 2010-09-20
Filing date: 2010-09-20
Publication date: 2013-09-02
Also published as: KR20120030896A

Abstract

The present invention is to install the turbine behind the propeller in addition to the propulsion system coupled to the existing engine and the propeller is coupled to the turbine using a propeller rotating shaft and a freewheel clutch. When the turbine is rotating faster than the propeller speed, the rotation is applied to the rotating shaft to reduce the torque on the rotating shaft, which leads to a reduction in the engine load, thereby saving energy. The present invention also relates to a propulsion system of a ship using a freewheel clutch turbine, in which the freewheel clutch rotates freely without any influence on the rotating shaft even if the freewheel clutch is slower than the propeller revolution in a specific situation.

Description

Ship propulsion system using Freewheel clutch Turbine

The present invention relates to a turbine mounted on the propeller rear of a ship and to an additional turbine to the existing propeller to improve the propulsion efficiency.

Propellers are used as propellers in most merchant ships. The ship's propulsion system consists of an engine and a propeller. The engine rotates the propeller shaft, and the propeller rotates to create thrust to move the ship forward. The efficiency of the propeller is expressed as the ratio of the power due to propeller thrust to the power to engine rotation. In order to improve propeller efficiency, the thrust should be exerted for the same torque or the torque should be reduced for the same thrust. In the former case, many attempts have been made to produce more propeller thrust, but cavitation (a phenomenon in which water turns to air due to low pressure when the propeller rotates) occurs, which makes it difficult to increase efficiency. The latter is invented to reduce torque, and is typically PBCF (Propeller Boss Cap Fin).

1 is a view of a propeller boss cap pin with a conventionally proposed technique.

2 is a vane wheel diagram of a conventionally proposed technique.

As shown in FIG. 1, the PBCF has a small wing attached to a propeller cap for preventing the propeller from being detached. The PBCF is fixed to the propeller shaft and rotates at the same speed as the propeller. At this time, the fluid is introduced into the blade of the PBCF to generate a rotational force in the same direction as the propeller rotation direction. This force reduces the torque on the rotating shaft, improving overall propulsion efficiency. In addition, the present invention has the effect of reducing the resistance by removing the cavitation generated in the propeller cap portion with a wing attached to the cap.

However, in the case of PBCF, the wing size cannot be increased because it is attached behind the propeller and rotates at the same speed as the propeller. In other words, if the wing is made large to make the wing of PBCF larger, the propulsion efficiency decreases because the torque increases. As a result, the torque reduction effect is small in the case of PBCF with small wings.

As illustrated in FIG. 2, the vane wheel is mounted to a wheel that freely rotates behind the propeller. In this case, the wheel is made larger than the propeller diameter and is divided into a turbine part and a propeller part. The turbine part is smaller than the propeller diameter, which uses the flow of fluid behind the propeller to rotate the wheel. When the wheel is rotated, propeller parts of the larger part than the propeller diameter generate thrust, and propeller thrust and wheel thrust are added to the propulsion efficiency as a whole.

Although the vane wheel is known to have a large energy reduction effect, the vane wheel diameter is larger than the propeller diameter, but the effect occurs. If the diameter of the vane wheel is larger than the propeller diameter, damage may occur in the port or the shallow water, which is a problem.

Many attempts have been made to attach the turbine to the back of the propeller to improve propulsion efficiency by using the propeller wake.However, if the turbine is fixed to the propeller shaft, the shape of the turbine is larger than that of the propeller. . In addition, if a freely rotating turbine is attached behind the propeller, the flow can be changed, but the effect is insignificant, and the torque is not reduced.

The present invention is designed to solve the problems of the prior art as described above, the present invention provides a propulsion system using a freewheel clutch turbine having a blade larger than the PBCF, the torque reduction effect is large and smaller than the propeller diameter, the risk of damage. There is.

In addition, even if the rotational speed of the turbine is slower than the propeller in a specific condition is to provide a propulsion system using a freewheel clutch turbine does not affect the rotational axis due to the characteristics of the freewheel clutch does not reduce the propulsion efficiency.

In order to solve the above problems, in the present invention, a propeller 20 mounted on the rotating shaft 50 receives the driving force from the engine 60; A freewheel clutch 31 mounted on the rotation shaft behind the propeller 20; And a turbine 30 fixedly attached to an outer side of the freewheel clutch, wherein the freewheel clutch is rotated in the direction of propeller when the rotation speed of the turbine rotated by the wake of the propeller is faster than the speed of the propeller. The present invention proposes a ship propulsion system using a freewheel clutch turbine, which is configured to be locked and idle at no load when the propeller is slower than the rotation speed of the propeller.
Here, the diameter of the turbine is preferably 0.1 to 1.0 times the diameter of the propeller.
In this case, the turbine is preferably designed to rotate faster than the rotational speed of the propeller.
In addition, the turbine is preferably attached to the cap to prevent the departure from the rear.
And the number of blades of the turbine is preferably 2 to 8.

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The fluid passing the propeller rotates the turbine connected to the freewheel clutch, and the rotation speed increases, and if the rotation speed increases beyond the propeller rotation, the freewheel clutch is locked to apply additional rotational force to the rotating shaft. This causes the rotation shaft to increase in speed or decrease in torque. Increasing the number of revolutions increases the propeller thrust, thus increasing the speed of the ship. In addition, when the torque of the engine decreases, the fuel consumption decreases and energy is reduced. The efficiency of the propeller is expressed as the energy ratio due to the thrust generation to the energy consumed in the rotation. The energy consumed in the rotation by the freewheel clutch turbine is reduced, thereby improving the overall propeller efficiency.

In addition, if the turbine is not faster than the propeller speed under certain operating conditions, the freewheel clutch turbine is free to rotate and does not affect the axis of rotation, so there is no energy loss due to the attachment of the device.

1 is a view of a propeller boss cap pin with a conventionally proposed technique
2 is a vane wheel diagram with a conventionally proposed technique;
3 is a side view of the propulsion system according to the present invention;
4 is a schematic diagram of a propulsion system according to the present invention;
5 is a detailed view of the propulsion system according to the present invention;
6 is a view including a propeller cap of the propulsion system of the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a schematic diagram of a propulsion system according to the present invention;

5 is a detailed view of the propulsion system according to the present invention.

6 is a view including a propeller cap of the propulsion system of the present invention.

The present invention is a type to attach the turbine 30 behind the propeller 20 of the vessel 10 and the turbine 30 is coupled to the rotating shaft using a freewheel clutch 31. In more detail, the freewheel clutch 31 is coupled to the rotary shaft 50 using the key 33, and the turbine blade 34 is attached to the outside of the freewheel clutch 31.

Ship 10 propulsion system according to the present invention is operated as follows. The engine 60 rotates the propeller 20, and the ship 10 moves at a constant speed by the thrust generated. The fluid passing the propeller 20 rotates the turbine blade 34 connected to the freewheel clutch 31 in the same rotational direction as the propeller 20. When the rotational speed of the turbine 30 is slower than the propeller 20 rotational speed, the turbine 30 rotates freely as if it is connected to the bearing. The roller ball 32 is locked to apply a rotation to the rotating shaft (50). Therefore, the turbine 30 designed to rotate faster than the propeller 20 rotates faster than the propeller 20 rotates. At this time, the freewheel clutch 31 is locked and rotates the rotation shaft 50 so that the torque of the rotation shaft 50 as a whole. Decreases to increase the propulsion efficiency. In addition, the freewheel clutch 31 has an additional torque to increase the speed of the propeller 20 to increase the speed of the vessel (10). All these effects indicate that the turbine 30 combined with the freewheel clutch 31 saves energy.

In addition, under certain conditions, even if the turbine 30 rotates slower than the propeller 20, the roller ball 32 inside the freewheel clutch 31 rotates freely and does not affect the rotating shaft 50, thereby reducing the There is no rotation loss due to the attachment.

Until now, the ship propulsion system using the freewheel clutch turbine according to the present invention has been described with reference to the embodiment shown in the drawings, but this is merely illustrative, and those skilled in the art can make various modifications and equivalent other embodiments from this. Will understand. Therefore, the true technical protection scope should be determined by the technical spirit of the appended claims.

10: ship 20: propeller
30: turbine 31: freewheel clutch
32: roller ball 33: key
34: turbine blade 40: cap
50: rotation axis 60: engine

Claims

A propeller 20 mounted on the rotation shaft 50 receiving the driving force from the engine 60;
A freewheel clutch 31 mounted on the rotation shaft behind the propeller 20; And
A turbine 30 fixedly attached to the outside of the freewheel clutch;
Consist of,
The freewheel clutch is locked in the rotational direction of the propeller when the rotational speed of the turbine that is rotated by the wake of the propeller is faster than that of the propeller. Ship propulsion system using a freewheel clutch turbine.

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The method of claim 1,
The diameter of the turbine is a ship propulsion system using a freewheel clutch turbine, characterized in that 0.1 ~ 1.0 times the diameter of the propeller.

The method of claim 1,
The turbine propulsion system using a freewheel clutch turbine, characterized in that designed to rotate faster than the speed of the propeller.

The method of claim 1,
The turbine is a marine propulsion system using a freewheel clutch turbine, characterized in that the cap is attached to the rear to prevent the departure.

The method of claim 1,
Ship propulsion system using a freewheel clutch turbine, characterized in that the blade number of the turbine is 2 to 8.