KR20150077578A - Propulsive device for ship - Google Patents

Abstract

The present invention provides a propulsive device for a ship comprising: a propulsive unit rotatably coupled to a bottom of the ship to supply propulsion to propel the ship; a first swirl generating unit formed on the propulsive unit to form a first swirl which rotates in a first rotational direction from a fluid passing the propulsive unit; and a second swirl generating unit formed on the propulsive unit to form a second swirl which rotates in the first rotational direction from the fluid passing the propulsive unit, wherein the second swirl generating unit is formed separately on the propulsive unit from the first swirl generating unit to generate the second swirl on a point separated from the first swirl in order to mutually offset the first swirl and the second swirl. In accordance with the present invention, because a tip vortex cavitation phenomenon generated on an end of the propulsive unit can be prevented by offsetting the swirls during the process of moving the ship, lifecycles of the propulsive unit and a leader can be improved, and a noise caused by a tip vortex cavitation can be reduced.

Description

[0001] PROPULSIVE DEVICE FOR SHIP [0002]

The present invention relates to a propulsion device for a ship for propelling the ship.

Generally, the ship propeller obtains the thrust by the pressure difference between the front and the back. At this time, in the region where the pressure drops below the vapor pressure at the front surface, the vaporization phenomenon of water appears. This phenomenon is distinguished from boiling as the temperature rises at a given pressure. Air bubbles generated by a drop in pressure at a given temperature are called cavities or cavities, and the phenomenon in which they occur is called cavitation.

Here, the cavitation phenomenon is a phenomenon in which water is air-conditioned due to the local pressure drop below the vapor pressure around the propeller blades, and bubbles are generated in the liquid when the static pressure is lower than the vapor pressure of the liquid.

1 is a sectional view for explaining a ship according to the prior art.

Referring to FIG. 1, the prior art ship 1 may include a hull 10 and a propulsion device 20 for moving the hull 10.

The hull (10) is moved in the sea by the propulsion force generated from the propulsion device (20). The propulsion device 20 is coupled to the lower end of the hull 10. Thus, the hull 10 is advanced or retracted in the sea.

The propulsion device 20 generates propulsive force. Accordingly, the propulsion device 20 moves the hull 10. The propulsion device (20) is installed at the lower end of the hull (10). Here, the tip of the propulsion unit 20 is tipped by cavitation due to the pressure drop due to the rapid rotation of the tip vortex generated at the tip. As a result, the tip of the propulsion device 20 is damaged due to the tip vortex cavitation phenomenon, and the tip vortex turboise passing through the propulsion device 20 is transferred to the propulsion device 20, There is a problem that the rudder is damaged and noise is generated as a result of collision with a rudder (not shown) located on the rear side of the ship 1, There is a problem that it takes a lot of time to work for repairing the propulsion device 20 and the rudder as well as for dropping.

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above problems, and it is an object of the present invention to provide a propulsion device for a ship to prevent tip vortex cavitation phenomenon from occurring.

In order to solve the above-described problems, the present invention can include the following configuration.

The propulsion unit of the ship according to the present invention includes: a propulsion unit rotatably coupled to a bottom surface of the ship to provide propulsive force for propelling the ship; A first vortex generating unit formed in the pushing unit to form a first vortex rotating in a first rotation direction from a fluid passing through the pushing unit; And a second vortex generation part formed in the propelling part to form a second vortex rotating in the first rotation direction from the fluid passing through the propelling part, And the second vortex is formed at the pushing portion so as to be spaced apart from the first vortex generating portion so as to occur at a point where the second vortex is separated from the first vortex so as to cancel two vortices from each other.

The propulsion device for a ship according to the present invention is characterized in that the second vortex generating portion includes a spacing groove formed in the propelling portion so as to protrude from the first vortex generating portion to the outside of the propelling portion.

The propulsion device for a ship according to the present invention includes a connecting surface connecting the first vortex generating portion and the second vortex generating portion, wherein the first vortex generating portion has an Included Angle 45 Is formed in the pushing portion so as to be equal to or more than 135 degrees.

The propulsion device for a ship according to the present invention includes a connecting surface connecting the first vortex generating portion and the second vortex generating portion, and the connecting surface is perpendicular to the first and second vortex generators And the protruding portion is formed in the pushing portion.

According to the propulsion apparatus of the present invention, the propulsion unit is coupled to the bottom surface of the ship so that a plurality of propulsion units can rotate, and the spacing grooves are formed at a leading edge toward the rotation direction of the propulsion units, And a trailing edge of the pushing portion facing the one of the pushing portions.

According to the present invention, the following effects can be achieved.

Since the tip vortex cavitation phenomenon of the propeller can be prevented by canceling the vortex generated in the process of moving the ship, the life of the propeller and the rudder can be improved, and the noise generated from the propeller and rudder You can reduce it.

1 is a sectional view for explaining a ship according to the prior art,
2 is a sectional view for explaining a propulsion device of a ship according to the present invention,
3 is a perspective view for explaining a propulsion apparatus of a ship according to the present invention,
4 is a cross-sectional view for explaining how the first vortex and the second vortex are canceled in the propulsion device of the ship according to the present invention,
5 is a sectional view for explaining a forming direction of a spacing groove in a propulsion device of a ship according to the present invention,
6 is a perspective view for explaining a modified example of the spacing grooves in the propulsion device of the ship according to the present invention.

It should be noted that, in the specification of the present invention, the same reference numerals as in the drawings denote the same elements, but they are numbered as much as possible even if they are shown in different drawings.

Meanwhile, the meaning of the terms described in the present specification should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item, and the third item" means a combination of all items that can be presented from two or more of the first item, the second item, or the third item do.

3 is a perspective view for explaining a propulsion device of a ship according to the present invention, and Fig. 4 is a perspective view of a propulsion device of a ship according to the present invention. Fig. 2 is a sectional view for explaining a propulsion device of a ship according to the present invention, Sectional view for explaining that the vortex and the second vortex are canceled.

2 to 4, a propulsion apparatus 100 of a ship according to the present invention includes a propulsion unit 110 rotatably coupled to a bottom surface of the ship, And a second vortex generation unit 130 formed in the propelling unit 110 to form a second vortex 131. The first vortex generation unit 120 may be formed in the first vortex generation unit 110,

The propulsion unit 110 is rotatably coupled to a bottom surface of the ship to provide propulsive force to propel the flaring vessel. The propelling unit 110 may rotate about a propelling shaft installed on the ship. The first vortex generator 120 forms a first vortex 121 rotating in the first rotation direction from the fluid passing through the propelling unit 110. The second vortex generating unit 130 generates a second vortex 131 rotating in the second rotation direction from the fluid passing through the propelling unit 110 at a position away from the first vortex 121 .

Accordingly, in the propulsion device 100 of the present invention, when the fluid passes through the propelling unit 110, the first vortex 121 and the second vortex 131 are canceled, so that tip vortex cavitation The occurrence of the phenomenon can be prevented. Therefore, the propulsion device 100 of the present invention can prevent the propulsion unit 110 from being damaged by the tip vortex cavitation phenomenon, so that the lifetime of the propulsion unit 110 can be improved. Accordingly, the propulsion unit 100 of the present invention can reduce the time required for the operation for repairing the propulsion unit 110, and further improve the efficiency of the operation for propelling the ship .

Hereinafter, the propulsion unit 110, the first vortex generators 120, and the second vortex generators 130 will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 2 to 4, the propelling unit 110 provides a propulsive force for propelling the ship. For this purpose, the propelling unit 110 may be rotatably coupled to the stern of the ship. Here, in the process of propelling the vessel, the contact area varies depending on the angle at which the fluid passes through the propelling unit 110, thereby causing a speed difference of the fluid. As a result, a vortex is generated at the end of the propelling unit 110 as the fluid flows from the high pressure side to the low pressure side. Here, the ship may be provided with a rudder (not shown) for changing the direction of the propulsive force of the propelling unit 110. In this case, the propelling unit 110 may generate propulsive force toward the rudder side.

The rudder can change the direction of movement of the ship by changing the direction of the propulsive force generated from the propelling unit 110. To this end, the rudder may be rotatably mounted on the vessel. The tip portion of the propelling unit 110 may generate tip vortex cavitation during the passage of the fluid, resulting in damage such as erosion of the tip.

In order to solve this problem, the first vortex generator 120 forms a first vortex 121 rotating in the first rotation direction from the fluid passing through the impeller 110. The first vortex generators 120 may be formed in the propelling unit 110. The first vortex generating unit 120 forms the first vortex 121 in the same direction as the second vortex 131 so that the first vortex 121 and the second vortex 131 meet each other Position. ≪ / RTI >

The second vortex generation unit 130 forms a second vortex 131 rotating in the first rotation direction from the fluid passing through the propelling unit 110. The second vortex generators 130 may be formed in the propelling unit 110. The second vortex generating unit 130 may generate the second vortex 131 at a position spaced apart from the first vortex 121. The second vortex generating unit 130 generates the second vortex 131 in the same direction as the first vortex 121 so that the first vortex 121 and the second vortex 131 are separated from each other, Can be offset at the locations where they meet each other. The second vortex generators 130 may be formed closer to the inner side of the propelling unit 110 than the first vortex generators 130.

Accordingly, the propulsion apparatus 100 according to the present invention is configured such that the second vortex generators 130 are spaced apart from the first vortex generators 120, so that the first vortex generators 130, which rotate in the first direction, The vortex 121 and the second vortex 131 can be canceled to prevent tip vortex cavitation phenomenon from occurring during passage of the fluid through the propelling section 110. [ Therefore, the propulsion apparatus 100 of the present invention can prevent the propulsion unit 110 and the rudder from being damaged by the tip vortex cavitation phenomenon, so that the lifetime of the propulsion unit 110 and the rudder can be reduced Can be improved. Accordingly, the propulsion device 100 of the present invention can reduce the time required for the operation for repairing the propulsion unit 110 and the rudder, and can improve the efficiency of the operation for propelling the ship Can be improved.

4, the first direction may be a direction from the lower side of the propelling unit 110 to an upper side that is lower than the lower side of the propelling unit 110 relatively.

Referring to FIGS. 2 to 4, the propulsion device 100 according to the present invention may include a spacing groove 140 formed in the propelling section 110.

The spacing groove 140 is formed in the propelling unit 110 such that the second vortex generating unit 130 is formed to protrude from the first vortex generating unit 120 to the outside of the propelling unit 110. Accordingly, the spacing groove 140 may form a step between the first vortex generators 120 and the second vortex generators 130. In this case, the spacing groove 140 may be formed at a time when the first vortex 121 and the second vortex 131 are different from each other. The distance between the first vortex 121 and the second vortex 131 is determined by the step difference between the first vortex generators 120 and the second vortex generators 130 You can decide.

As a result, the propulsion device 100 of the present invention may be constructed so that the first vortex 121 and the second vortex 131 are generated at different points of time, The first vortex 121 and the second vortex 131 are caused to collide with each other. Accordingly, the propulsion unit 100 of the present invention can prevent the propulsion unit 110 and the rudder from being damaged by the tip vortex cavitation phenomenon, It is possible not only to reduce the time required for the work to be performed, but also to improve the efficiency of the operation for propelling the ship.

In addition, in the propulsion device 100 of the present invention, the spacing grooves 140 form steps between the first vortex generators 120 and the second vortex generators 130 and are spaced apart from each other, The time of the first vortex 121 and the time of the second vortex 131 can be determined. Accordingly, the propulsion apparatus 100 of the present invention can cause the first vortex 121 and the second vortex 131 to collide with each other at the correct positions by the spacing grooves 140. Accordingly, the propulsion device 100 of the present invention can precisely control the positions where the first vortex 121 and the second vortex 131 are canceled, and thereby the first vortex 121 and the second vortex 131 It can contribute to improving the canceling force of the vortex 131.

Here, the propulsion apparatus 100 of the present invention may include a connecting surface 150 connecting the first vortex generating unit 120 and the second vortex generating unit 130.

The connection surface 150 is vertically connected to the first vortex generators 120 and the second vortex generators 130. The connection surface 150 may be connected to the propelling unit 110. Here, the first vortex generators 120 may be formed in the propelling unit 110 such that the inclined angle between the first vortex generators 120 and the connection surface 150 is 90 degrees. The connection surface 150 may connect the first vortex generators 120 and the second vortex generators 130. For example, the first vortex generators 120 may be connected to one side of the connection surface 150, and the second vortex generators 130 may be connected to the other side of the connection surface 150.

Accordingly, in the propulsion device 100 of the present invention, the connecting surface 150 is formed perpendicular to the first vortex generators 120 and the second vortex generators 130, It is possible to prevent the directions of the first vortex generators 120 and the second vortex generators 130 from being changed by connecting the vortex generators 120 and the second vortex generators 130. [ Accordingly, the propulsion unit 100 of the present invention is implemented to prevent the vortexes other than the first vortex 121 and the second vortex 131 from being generated from the propelling unit 110 . Accordingly, the propulsion device 100 of the present invention can prevent the first vortical flow 131 and the second vortical flow 141 from deviating from each other in the direction of the first vortex 131 and the second vortex 141, It is possible to prevent the first vortex 121 and the second vortex 131 from being deteriorated as the direction of the first vortex 121 and the second vortex 131 change, It is possible to prevent the propulsion unit 110 and the rudder from being damaged as the tip vortex cavitation phenomenon occurs due to the other vortices.

5 is a cross-sectional view illustrating a forming direction of a spacing groove in a propulsion device of a ship according to the present invention.

Referring to FIG. 5, a plurality of the propelling units 110 are rotatably coupled to a bottom surface of the ship.

In this case, each of the spacing grooves 140 is formed in each of the propelling portions 110 so as to face either one of the front direction toward the rotation direction of the propelling portions 110 or the rear direction to the direction opposite to the front direction. For example, when the spacing groove 140 is formed in the trailing edge, the first vortex generators 120 are formed at the rear of the propelling unit 110, May be formed at the front of the unit 110. In this case, a plurality of the spacing grooves 140 may be formed at the rear of each of the pushing portions 110 so as to face the trailing edge of the pushing portion 110. The first vortex generators 120 may be formed at the front of the propelling unit 110 and the second vortex generators 130 may be formed at the front of the propelling unit 110. Alternatively, May be formed at the back of the portion 110. [ In this case, a plurality of the spacing grooves 140 may be formed in front of each of the propelling portions 110 so as to face the front portion of the propelling portion 110. [ Accordingly, in the propulsion device 100 of the present invention, the spacing grooves 140 are formed in the same direction in each of the propelling portions 110, so that the first vortices 121 and The second vortex 131 may be canceled.

6 is a perspective view for explaining a modified example of the spacing grooves in the propulsion device of the ship according to the present invention.

Referring to FIG. 6, the first vortex generators 120 are formed in the propelling unit 110 such that the inclined angle between the first vortex generators 120 and the connecting surface 150 is 45 degrees or more and 135 degrees or less.

For example, the first vortex generators 120 may reduce the size of the spacing grooves 140 as the inclined angle becomes 45 degrees toward the propelling unit 110 from the propelling shaft. In this case, the first vortex generators 120 may be formed to have the minimum size of the spacing grooves 140.

Also, the first vortex generators 120 may increase the size of the spacing grooves 140 as the inclined angle becomes 135 degrees toward the propelling unit 110 from the propelling shaft. In this case, the first vortex generators 120 may be formed to have the maximum size of the spacing grooves 140.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of.

100: propulsion unit of the ship 110: propulsion unit
120: first vortex generating unit 130: second vortex generating unit
140: spacing groove 150: connecting surface

Claims (5)

A propulsion unit rotatably coupled to a bottom surface of the ship to provide propulsive force for propelling the ship;
A first vortex generating part formed in the pushing part to form a first vortex rotating in a first rotation direction from a fluid passing through the pushing part; And
And a second vortex generator formed in the pushing portion to form a second vortex rotating in the first rotation direction from the fluid passing through the pushing portion,
The second vortex generating portion is formed in the pushing portion so as to be spaced apart from the first vortex generating portion such that the second vortex is generated at a position away from the first vortex so as to cancel out the first vortex and the second vortex from each other Wherein the propulsion device of the ship is characterized in that: The method according to claim 1,
Wherein the second vortex generating unit comprises a spacing groove formed in the pushing unit such that the second vortex generating unit is formed to protrude from the first vortex generating unit to the outside of the pushing unit. The method according to claim 1,
And a connecting surface connecting the first vortex generating unit and the second vortex generating unit,
Wherein the first vortex generators are formed in the propelling unit such that an inclined angle between the first vortex generating unit and the connecting surface is 45 degrees or more and 135 degrees or less. The method according to claim 1,
And a connecting surface connecting the first vortex generating unit and the second vortex generating unit,
Wherein the connecting surface is formed in the propelling portion perpendicular to the first and second vortex generators. 3. The method of claim 2,
Wherein the propulsion unit is rotatably coupled to a bottom surface of the ship,
Wherein the spacing groove is formed in each of the propelling portions so as to face either the leading edge toward the rotation direction of the propelling portions or the trailing edge toward the direction opposite to the front direction. Propulsion device.

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