KR20150129529A - Duct structure of azimuth thruster - Google Patents

Abstract

The present invention relates to a duct structure of an azimuth thruster, which forms a circular portion on a lower dead end of a duct so as to prevent the loss of thrust generated by the Coanda effect, thereby obtaining an effect of thrust improvement and fuel reduction by inducing the Coanda effect wherein a flow is bent along the circular portion in a lower portion of the duct inside the duct itself.

Description

DUCT STRUCTURE OF AZIMUTH THRUSTER < RTI ID = 0.0 >

[0001] The present invention relates to a duct structure of an azimuth thruster, and more particularly, to prevent a thrust loss caused by a coanda effect, a thruster itself is not designed at a certain angle but a circular portion is formed at a lower end of the duct The duct structure of the azimuth thruster which can induce a nose-and-busting effect in which the flow is bent along the circular portion of the lower portion of the duct in the duct itself, thereby achieving the thrust improvement effect and the fuel saving effect.

Generally, Azimuth Thruster is a propeller device installed on a ship, and a connecting part for rotating in any horizontal direction is linked to a motor and a peripheral device.

The upper end of the Ajimus thruster is equipped with a guide plate. The guide plate is tightly fixed to the hull, thereby isolating the motor and the peripheral device inside the vessel and the propeller protruding outside the vessel.

Such an azimuth thruster has the advantage that it is easier to adjust than a system having a fixed propeller and a rudder without the need for a separate rudder, and has advantages such as semi-submersible drill rigs It is also mounted on the same large ship.

It is also used for dynamic positioning for maintaining the ship's position and bow angle.

Azimuth thrusters can include propellers and ducts because they have a high degree of algae and blue, and also require greater thrust at low speeds.

The propeller is installed to rotate inside the duct, causing the fluid in front of the propulsion system to flow to the rear of the propulsion system to generate thrust. This thrust generation depends on the propeller.

The duct is installed in order to improve the flow-in and outflow efficiency of the propeller when the propeller is driven. In particular, the duct is subjected to a large thrust at a very low speed condition such as a bollard condition in which dynamic position control is performed.

Here, the Bollard condition can mean a condition in which the ship is almost stationary and floating even when the propeller is driven.

Recently, as the capacity of the ship has increased and the required work has been advanced, the thrust required for the ship is increasing.

On the other hand, since the conventional thrust capacity of a conventional swing propulsion device is limited, it is urgently required to develop a technology for improving the thrust efficiency in order to order and dry a more competitive high-tech ship.

1 is a side view showing a conventional Ajmus thruster.

1, a conventional azumorous thruster 10 has a strut 11 rotatably coupled to a hull 1, and a streamlined pod 12 (see FIG. 1) ).

In the pod 12, a propeller shaft 13 is installed so as to protrude outward through a shaft hole (not shown).

A drive shaft 16 capable of transmitting power from the engine of the hull 1 is located inside the strut 11 and the drive shaft 16 is engaged with the propeller shaft 13.

A propeller (14) is coupled to one end of the propeller shaft (13). The duct 15 is supported by a current fixing blade (not shown) and a strut 11 and serves to cover the outside of the propeller 14.

However, since the conventional azumuth thruster 10 is formed in a narrow blade shape having a duct having a camber and is located close to the bottom of the hull, a fast flow velocity generated through the azimuth thrusters is called a nose There occurs a problem that the propelling efficiency is reduced.

In order to prevent such a problem, recently, a technique of installing the azimuth thrusters themselves at a certain angle has been proposed, but the problem of reducing the propulsion efficiency still can not be solved.

Publication No. 10-2012-0100267

In order to solve the above-mentioned problems, the present invention is not designed to design a thruster itself at a certain angle in order to prevent a thrust loss caused by a coanda effect, but rather to form a circular part at the lower end of the duct, And it is an object of the present invention to provide a duct structure of an azimuth thruster which can induce a coanda effect in which a flow is bent along a circular portion of a lower portion of a duct to obtain an effect of improving thrust and a fuel saving effect.

In order to achieve the above-mentioned object, the present invention provides a propeller comprising: a rotating body rotatably coupled to a hull; a propeller coupled to a propeller shaft rotatably installed horizontally on the rotating body; An azimuth thruster having a duct covering a propeller, wherein a circular portion is formed at an end of the duct, and a thrust of the hull is improved by inducing a nose-and-busting effect in which the flow of the fluid is bent along the circular portion. Provides a duct structure for a musstruster.

The rotating body may be composed of a strut rotatably installed on the hull and a pod coupled to a lower portion of the strut, or a pod may be rotatably installed on the hull.

The circular portion is preferably formed at a lower end of the duct.

As described above, according to the present invention, the thrusters themselves are not designed to have a certain angle in order to prevent the thrust loss caused by the coanda effect, but rather the circular part is formed at the lower end of the duct, It is possible to obtain an effect of improving the thrust and a fuel saving effect by inducing a coanda effect in which the flow bends along the lower circular portion.

1 is a side view showing a conventional azimuth thruster
FIG. 2 is a side view showing a duct structure of the azumuth thruster according to the first embodiment of the present invention. FIG.
3 is a view for explaining a coanda effect;
FIG. 4 is a side view showing a duct structure of the azumuth thruster according to the second embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a duct structure of an azimuth thruster according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a side view showing the duct structure of the Ajmus thruster according to the first embodiment of the present invention, and FIG. 3 is a view for explaining a coanda effect.

Referring to FIGS. 2 and 3, the azimuth thruster 100 according to the first embodiment of the present invention includes a rotating body 110 rotatably coupled to the hull 1.

The rotating body 110 may include a strut 111 rotatably installed on the hull 1 and a pod 112 coupled to the lower portion of the strut 111.

The propeller 130 is coupled to a propeller shaft 120 installed horizontally rotatably in the pod 112.

The propeller 130 is a device for providing a thrust to the ship and is coupled to one end of the propeller shaft 120 and converts the rotational force of the propeller shaft 120 into a linear motion of the ship.

A drive shaft 16 capable of transmitting power from the engine of the hull 1 is disposed in the strut 111 and the drive shaft 16 is engaged with the propeller shaft 120.

Since the power transmission structure between the drive shaft 16 and the propeller shaft 120 corresponds to a known technology, a detailed description thereof will be omitted in the present invention.

The duct 150 may be supported by a current stabilizing vane (not shown) and a strut 111 and serves to cover the outside of the propeller 130.

The duct 150 is a tube-shaped device for guiding the flow of water according to the traveling direction of the ship. The flow rate can be increased or decreased according to the shape of the duct 150.

For example, forming the duct 150 to increase the flow rate can reduce the load on the propeller 130, and forming the duct 150 to reduce the flow velocity can delay the occurrence of cavitation.

In the duct structure of the azimuth thrust of the present invention, instead of designing the azimuth thrust itself at a certain angle in order to prevent the thrust loss caused by the coanda effect, The effect of improving the thrust and reducing the fuel consumption can be obtained by inducing the coanda effect that the flow is bent along the circular portion 152 in the duct 150 itself.

The coanda effect refers to a phenomenon in which a flow flows along a curved surface, that is, a phenomenon in which a gas or a fluid is adsorbed on a wall at a high speed. The present invention induces a coanda effect in which a fluid flow is bent, The fuel saving effect can be obtained.

The operation of the duct structure of the azumustrer according to the present invention is as follows.

In the cross section of the duct 150, the inner surface portion has a larger curved surface than the outer surface portion, that is, it has a camber.

When the fluid flows from the inlet side to the outlet side of the duct 150, the fluid moves along the curved surface of the inner surface portion. The circular portion 152 is formed at the lower end 151 of the duct 150, As shown by the arrow in Fig. 3, induces a coanda effect in which the flow of the fluid bends along the circular portion 152 of the lower portion of the duct 150, thereby achieving the effect of improving the thrust and reducing the fuel consumption .

4 is a side view showing a duct structure of the azumuth thruster according to the second embodiment of the present invention.

4, the azimuth thruster 200 according to the second embodiment of the present invention is different from the azimuth thruster 100 according to the first embodiment described above, The pod 210 is directly rotatable.

A propeller shaft 220 installed horizontally rotatably in the pod 210 is coupled to the propeller shaft 220 and the circular portion 252 is formed at the lower end 251 of the duct 250, It is possible to obtain the effect of improving the thrust and the effect of reducing the fuel by inducing the coin and the effect that the flow is bent along the circular portion 252 of the duct 250 from the inside of the duct 250 itself.

As described above, according to the present invention, the thrusters themselves are not designed to have a certain angle in order to prevent the thrust loss caused by the coanda effect, but rather the circular part is formed at the lower end of the duct, The coin effect in which the flow is bent along the lower circular portion is induced, and the effect of improving thrust and the fuel saving effect can be obtained.

1: Hull
100: Ajimus Thruster
111: strut
112: streamlined pod
120: propeller shaft
130: Propeller
150: Duct
151: Round end
152:

Claims (4)

An azimuth thruster comprising: a rotating body rotatably coupled to a hull; a propeller coupled to a propeller shaft horizontally rotatably mounted on the rotating body; and a duct supported by the rotating body to cover the propeller, Wherein a circular part is formed at an end of the duct to induce a nose-and-bending effect in which a flow of the fluid is bent along the circular part, thereby improving the thrust of the hull. The method according to claim 1,
Wherein the rotating body comprises a strut rotatably installed on the hull and a pod coupled to a lower portion of the strut. The method according to claim 1,
Wherein the rotating body is formed of a pod rotatably installed on the hull. The method according to claim 1,
And the circular portion is formed at a lower end of the duct.

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