KR20120083751A - Collapsible-expandible fairing and wind turbine installation vessel have the same - Google Patents

Abstract

PURPOSE: A flexible fairing and a windfarm installation ship with the same are provided to stably descend legs to a seabed by reducing water current resistance applied to legs and to improve the utilization of a loading space. CONSTITUTION: A flexible fairing comprises streamlined shaped lower plates(170) and streamlined shaped flexible pipes(130). The streamlined shaped lower plates are coupled to the lower end of legs installed in a hull to be vertically lifted. The lower end of the streamlined shape flexible pipes is coupled to the edge part of the lower plates. The intermediate section of the flexible pipes covers the legs and the upper end thereof is coupled to the hull. The flexible pipes are extended if the legs descend from the hull, and are shorten if the legs ascend.

Description

Flexible pairing and wind turbine installation vessel equipped with it {COLLAPSIBLE-EXPANDIBLE FAIRING AND WIND TURBINE INSTALLATION VESSEL HAVE THE SAME}

The present invention relates to a telescopic pairing and a wind turbine installation line having the same, and more particularly to a telescopic pairing to reduce the water flow resistance applied to the legs of the wind turbine installation line and a wind turbine installation line having the same. It is about.

Wind power is a promising alternative energy source that can replace fossil fuels and is a clean energy source with little environmental pollution. Wind power is known to be the most economical alternative energy source by the current technology.

The efficiency of wind turbines is higher with higher wind speeds and less wind direction changes. Since the sea has little influence due to the terrain, which reduces the flow of wind, the average wind speed of the sea wind is higher than that of the ground wind, and the air volume of the sea wind is also richer than that of the ground wind. In particular, the offshore winds farther from the inland, the less turbulent the characteristics, the more favorable for wind power generation.

In addition, when the wind turbine is installed on the ground, the place where the wind turbine can be installed is limited by noise and aesthetics, but it is advantageous in that the wind turbine is hardly subject to such restrictions. Therefore, large-scale offshore wind farms are now being built, and research and development for these are being actively conducted.

In the process of installing wind turbines on the sea, if the wind turbine installation vessel cannot maintain a constant position due to the influence of environmental loads such as waves and tides, it may cause a lot of difficulties in the installation work. do.

In order to overcome this difficulty, a plurality of legs are installed on the hull of the wind turbine installation vessel, and the legs are lowered to lower the legs so that the load of the hull is supported by the sea bottom. Post wind turbine installation method is used.

As a means for elevating the leg with respect to the hull, a hydraulic cylinder or a jack-up system using a rack gear and a pinion gear is known.

However, when the leg is lowered from the wind turbine installation line, the force due to the water flow resistance generated by waves or tidal current acts on the leg. The longer the leg is lowered, the greater the force due to the water flow resistance acting on the entire leg, and the force may not lower the leg to the desired position on the sea floor or overturn the wind turbine installation line.

In order to solve this problem, a method of reducing the force acting on the leg by water flow resistance has been attempted by installing a pairing having a streamlined cross section on the leg. However, the space occupied by the leg increases as much as the volume of the pairing installed in the leg, which reduces the loading space of the wind turbine installation line.

Embodiment of the present invention is to reduce the force due to the water flow resistance acting on the legs of the wind turbine installation line, to minimize the space required for the storage of the pairing to maximize the loading space of the wind turbine installation line.

According to an aspect of the present invention, a streamlined lower plate coupled to the lower end of the leg installed in the hull of the wind turbine installation line in the vertical direction, the lower end is coupled to the edge of the lower plate and the middle region is the leg The upper end portion includes a flexible tube having a top end coupled to the hull and having a streamlined cross section, and when the leg is lowered with respect to the hull, the flexible tube is elongated and the leg is raised when the leg is shortened. Formula pairing may be provided.

The expansion pipe may be formed with a plurality of folds are folded when a compressive force is applied in the longitudinal direction. In this case, the expansion pipe may be made of polyethylene or polypropylene.

The lower plate may have water permeability. At this time, the lower plate may be made of a porous plate or a network structure.

The stretchable fairing as described above may further include a plurality of streamlined rims which are distributedly coupled to the inner side or the outer side of the stretch tube to support the cross section of the stretch tube to be maintained in a streamline.

According to another aspect of the present invention, the pair is accommodated in the hull up and down in the vertical direction, including a flexible pairing as described above, wherein the hull is accommodated in the paired accommodating the shortened expansion pipe when the leg is raised A wind turbine installation line having an elastic pairing may be provided.

Here, the cross section of the pairing receiving portion may be streamlined.

The hull may be provided with an omnidirectional propeller.

In addition, the lower end of the leg may be installed or formed so that the landing base protrudes downwardly from the lower plate. At this time, the pairing receiving portion may be formed to accommodate the landing base when the leg is raised.

According to an embodiment of the present invention, by reducing the force due to the water flow resistance acting on the leg can be lowered to the bottom to the bottom of the stable, and when the leg is elevated by allowing the flexible pairing to be accommodated in the wind turbine installation ship It can improve the loading space utilization of generator installation ship.

1 is a side view of a wind turbine installation ship with a telescopic pairing according to an embodiment of the present invention.
2 is a view for explaining the fluid flow around the cylinder.
3 is a view for explaining the fluid flow around the streamlined column.
Figure 4 is a perspective view of the stretchable pairing according to an embodiment of the present invention.
5 is a cross-sectional view taken along the line VV of FIG. 4.
6 is a cross-sectional view of the portion indicated by A in FIG. 1 when the leg is raised.
7 is a cross-sectional view of the portion indicated by A in FIG. 1 when the leg is lowered.
8 is a cross-sectional view taken along the line VII-VII of FIG. 7.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In addition, the contents shown in the drawings reveals that in part may be enlarged or exaggerated to clearly illustrate the gist of the present invention.

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

Figure 1 shows a wind turbine installation line with a flexible pairing according to an embodiment of the present invention.

Referring to FIG. 1, the wind turbine installation line 10 including the telescopic pairing according to the embodiment of the present invention may include a hull 11, a leg 16, and a telescopic pairing 100. The deck 11, the omnidirectional propellers 13 and 14, and the leg lifting means housing 15 may be installed in the hull 11.

Although not shown, the deck 12 provided on the hull 11 may be loaded with parts or finished products of the wind turbine to be installed at sea, and at least one carrier such as a crane, a winch and a conveyor for transporting them. It can be installed over.

A plurality of leg through holes (not shown) are formed in the hull 11, so that the legs 16 may be installed to penetrate the hull 11 through the leg through holes (not shown). In addition, a plurality of leg lifting means housings 15 may be distributedly installed on the deck 12. In the leg lifting means housings 15, legs for lifting and lowering the legs 16 in the vertical direction with respect to the hull 11 are provided. Means (not shown) may be installed.

As the leg lifting means (not shown), a hydraulic cylinder or a jack-up system using a rack gear and a pinion gear may be used as described above.

Therefore, the plurality of legs 16 may be installed to be lifted up and down with respect to the hull 11. At this time, the plurality of legs 16 may be arranged so that the load of the hull 11 is evenly distributed to the plurality of legs 16 and stably supported when the wind turbine installation line 10 is raised above the sea level.

At this time, the number of legs 16 may be added or subtracted in consideration of the size of the hull 11, the strength of the legs 16 and the environment of the sea area to install the wind turbine.

Landing bases 17 may be installed or integrally formed at lower ends of the plurality of legs 16, respectively. The landing base 17 may be in contact with the sea bottom (not shown) when the legs 16 are lowered with respect to the hull 11 so that the load of the hull 11 is firmly supported by the sea bottom (not shown). have.

Here, the sea bottom (not shown) may be in various states such as mud, sand, gravel, or rock forming the surface layer, and the landing base 17 is manufactured to have a shape suitable for the state of the sea bottom (not shown). Can be.

That is, although not shown, when the bottom (not shown) is somewhat soft, such as mud or sand, the landing base 17 is embedded in the bottom (not shown) to fix the hull load. It can be manufactured in the shape of a pile or wedge to support it, and the landing base 17 and the bottom (not shown) contact when the sea bottom (not shown) is solid such as coarse gravel or rock. It can be manufactured in a shape such that the width of the landing base 17 is wider than the case described above so that the area is increased.

The lower side of the leg 16 may be provided with an elastic pairing 100 according to an embodiment of the present invention as shown. The flexible pairing 100 will be described later with reference to FIG. 4.

The omnidirectional propellers 13 and 14 may be installed below the hull 11 to move and rotate the hull 11 to a desired position and direction.

For reference, the vertical direction referred to in this specification means that the hull 11 is parallel to the direction in which gravity acts when maintaining the equilibrium state on the surface of the water. In addition, the vertical or parallel as referred to herein does not mean a mathematical or geometric vertical or parallel, but means a substantially vertical or parallel considering mechanical processing errors and the like.

2 is a view for explaining the fluid flow around the cylinder, Figure 3 is a view for explaining the fluid flow around the streamlined column. It demonstrates with reference to FIG. 2 and FIG.

2 and 3 show the flow of the fluid when the fluid is moved in the direction perpendicular to the longitudinal direction of the cylinder (CC) and the streamlined column (SSC), that is, in the X-axis direction, respectively (SLa, SLb). . For reference, the Y axis is perpendicular to the X axis and the longitudinal direction of the cylinder (CC) and streamlined column (SSC), respectively.

Comparing the flow of fluid around the cylinder CC and the streamlined column SSC, the turbulent flow region Va behind the column CC is wider than the turbulent flow region Vb behind the streamlined column SSC.

In particular, the position of the point where the fluid around the cylinder starts the turbulent flow is located in front of the streamlined column (SSC), which is delayed in the streamlined column (SSC) rather than the streamlined column (CC). Because. Therefore, the force received by the fluid flowing in the streamlined column SSC is smaller than the force received in the cylinder CC.

Therefore, if the leg (16 in FIG. 1) of the wind turbine installation line (10 in FIG. 1) is formed to have the same shape as a streamlined column (SSC), the legs (16 in FIG. It is possible to reduce the water flow resistance applied to).

Therefore, the stretchable pairing according to an embodiment of the present invention (100 in FIG. 1) may be manufactured so that the cross section is streamlined so that the water flow resistance applied to the leg (16 in FIG. 1) is reduced.

Unexplained La and Lb refer to the laminar flow region in which the fluid flows in a laminar flow.

4 is a perspective view of the flexible fairing according to an embodiment of the present invention.

Referring to FIG. 4, the stretchable fairing 100 according to the exemplary embodiment of the present invention may include an upper plate 110, an elastic tube 130, a rim 150, and a lower plate 170. In addition, a leg through hole 111 may be formed in the upper plate 110, and a leg through hole 171 may be formed in the lower plate 170.

The upper plate 110 may be coupled to the lower side of the hull (11 of FIG. 1), the lower plate 170 may be coupled to the lower end of the leg (16 of FIG. 1), which is shown in Figures 6 and 7 Reference will be made later.

The upper plate 110 and the lower plate 170 may be formed to have a streamlined edge as shown.

The lower end of the expansion pipe 130 may be coupled to the edge portion of the lower plate 170, the upper end of the expansion pipe 130 may be coupled to the edge portion of the upper plate 110.

At this time, the upper plate 110 may be coupled to the lower side of the hull (11 of FIG. 1) as described above. Therefore, the upper end of the expansion pipe 130 may be coupled to the hull (11 in FIG. 1) by the upper plate 110, the upper end of the expansion pipe 130 is not shown in the hull (11 in Figure 1) It may be combined directly.

A leg (16 in FIG. 1) may be inserted into the leg through hole 111 formed in the upper plate 110 and the leg through hole 171 formed in the lower plate 170. Therefore, the intermediate region of the expansion pipe 130 may cover the leg 16.

The expansion tube 130 may be elongated and shortened in the longitudinal direction, and may be manufactured to have a streamlined cross section perpendicular to the longitudinal direction. In order to extend and shorten the expansion tube 130, the expansion tube 130 may be made of a material having flexibility and elasticity.

In addition, in order to expand and shorten the expansion tube 130 more easily, the expansion tube 130 may be formed so that a plurality of folds are folded when a compressive force in the longitudinal direction is applied. That is, the expansion pipe 130 may be manufactured in the same shape as the corrugated pipe, and may be contracted while being folded by the compressive force, and then stretched in the longitudinal direction when the compressive force is released or a tensile force is applied.

A force due to the water flow resistance may be applied to the expansion pipe 130 of the expansion-type fairing 100. Therefore, the expansion pipe 130 should be able to maintain a streamlined cross section with respect to a force of a predetermined strength or less applied in a direction perpendicular to the longitudinal direction.

To this end, the expansion pipe 130 may be provided with a plurality of rims (rim) (150). The rim 150 may be distributedly coupled to the inner side or the outer side of the flexible tube 130 as shown, and may have a streamlined edge shape to support the cross section of the intermediate region of the flexible tube 130 to maintain the streamlined shape. Can be.

As the rim 150, a high elastic steel wire or synthetic resin can be used. Since the rim 150 can be frequently contacted with seawater, a material having high corrosion resistance, water resistance, weather resistance, and the like can be selected and used.

FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4.

Referring to FIG. 5, the stretchable tube 130 may have a streamlined cross section as described above. At this time, the expansion pipe 130 may be formed in a symmetrical streamline with respect to the center line (CL).

If the cross section of the expansion pipe 130 is asymmetrical with respect to the center line CL, fluid such as flowing seawater flows at different speeds on both sides of the expansion pipe 130, so that both sides of the expansion pipe 130 Differences in pressure may occur.

When the pressure difference occurs on both sides of the expansion pipe 130, since the lifting force acts in the direction of low pressure, that is, the flow velocity of the fluid, in addition to the water flow resistance, the force applied to the expansion pipe 130 may be increased.

Therefore, by forming the cross section of the expansion tube 130 to be symmetrical with respect to the center line CL, it is possible to minimize the force acting on the expansion tube 130 by the water flow.

FIG. 6 is a cross-sectional view of the portion indicated by A in FIG. 1 when the leg is raised.

Referring to FIG. 6, the pairing accommodating part 18 may be formed at a lower side of the hull 11 so as to be recessed upward. And, as shown, the pairing receiving portion 18 may be accommodated in the flexible pairing 100 in a state in which the expansion pipe 130 is shortened.

As mentioned above, the upper plate 110 of the flexible fairing 100 may be coupled to the lower side of the hull 11, the lower plate 170 may be coupled to the lower end of the leg (16).

Thus, when the leg 16 is raised relative to the hull 11 as shown, the lower plate 170 coupled to the lower end of the leg 16 may also be raised. Since the upper plate 110 is coupled to the hull 11, the expansion pipe 130 is subjected to a compressive force in the longitudinal direction by the upper plate 110 and the lower plate 170, the length thereof will be shortened as shown. Can be.

The pairing receiving portion 18 may be formed to accommodate the flexible pairing 100 shortened by the expansion tube 130, and the landing base 17 coupled to the end of the leg 16, as shown It may be formed to have a height h that can be accommodated together.

The telescopic pairing 100 is accommodated in the pairing accommodating portion 18 so as not to protrude to the bottom of the hull 11, so that the wind turbine installation line with the telescopic pairing (10 in FIG. 1) operates when the hull 11 is operated. It can reduce the resistance to). In addition, by allowing the landing base 17 to be accommodated in the pairing receiving portion 18, the resistance applied to the hull 11 can be further reduced.

On the other hand, when the wind turbine installation line (10 in FIG. 1) having a telescopic pairing to lower the leg 16 relative to the hull 11 in order to install the wind power generator (10) 130) may be stretched. This will be described with reference to FIG. 7.

FIG. 7 is a cross-sectional view of the portion indicated by A in FIG. 1 when the leg is lowered.

Referring to FIG. 7, the leg 16 is lowered with respect to the hull 11 so that the stretchable tube 130 of the stretchable fairing 100 is extended. That is, as the leg 16 descends, the upper plate 110 coupled to the hull 11 and the lower plate 170 coupled to the lower end of the leg 16 are separated.

At this time, the upper end of the expansion tube 130 is coupled to the upper plate 110, and the lower end is coupled to the lower plate 170, the compression force applied in the longitudinal direction to the expansion tube 130 is released and the tensile force is Can be applied.

That is, the expansion pipe 130 is extended as shown to protrude downward from the fairing receiving portion 18, the lower end may be lowered until the landing base 17 reaches the sea bottom. For reference, the maximum length that the expansion tube 130 can be extended may allow the middle region to cover the leg 16 even when the leg 16 is lowered to the maximum.

In this case, the stretchable tube 130 of the stretchable fairing 100 is stretched while maintaining a streamlined cross section, and the intermediate region of the stretchable tube 130 covers the leg 16. Thus, the water flow resistance acting on the leg 16 can be reduced by the telescopic pairing 100.

However, the flexible fairing 100 has an upper plate 110 is coupled to the hull 11 and the lower plate 170 is coupled to the lower end of the leg 16, the water flow resistance by the flexible pairing 100 In order to achieve the reduction effect of the flexible pairing 100 can change the direction of the hull 11 to be aligned in accordance with the flow direction of the sea water and then lower the leg 16. To this end, the hull 11 should be able to rotate smoothly, and forward thrusters (13 and 14 of FIG. 1) may be used to smoothly rotate the hull 11.

That is, the direction of the current in the working area to install the wind turbine can be determined or directly measured using a variety of geographic or meteorological information, so that the front of the flexible pairing 100 (H in Fig. 5) The leg 16 may be lowered after rotating the hull 11 to face the flow direction.

As the leg 16 is lowered, the volume in the expansion tube 130 increases. In this case, when the air is filled in the expansion pipe 130, buoyancy acts on the expansion pipe 130 in seawater, and thus may be subjected to resistance in the lowering of the leg 16. FIG.

On the contrary, if the seawater is filled in the expansion pipe 130 in the state in which the leg 16 is lowered, the seam may not flow smoothly out of the expansion pipe 130 when the leg 16 is raised. It can be difficult to elevate.

Therefore, the lower plate 170 may be manufactured to have water permeability. That is, when lowering the leg 16 that has been raised, the seawater flows smoothly into the expansion pipe 130 through the lower plate 170, and when lowering the leg 16 that has been lowered, the lower plate 170 is raised. By allowing the seawater to smoothly flow out of the expansion pipe 130 through), it is possible to smooth the lifting of the leg (16).

As described above, in order to make the lower plate 170 permeable, the lower plate 170 may be formed of a porous structure such as a network structure formed of a perforated plate, steel wire, or synthetic resin having a plurality of through holes.

On the other hand, since the expansion tube 130 can be repeatedly stretched and shortened by the lifting of the leg 16, the expansion tube 130 may be made of a material that is not easily broken fatigue. Examples of such materials include synthetic resins such as polyethylene and polypropylene.

FIG. 8 is a cross-sectional view taken along the line VIII-VIII shown in FIG. 7.

Referring to FIG. 8, the cross-section of the hull 11 in which the pairing receiving portion 18 in which the flexible pairing 100 is accommodated is formed may have a streamline like the flexible pairing 100.

This minimizes the space between the hull 11 and the flexible pairing 100 in the pairing receiving portion 18, so that the pairing receiving portion 18 in the wind turbine installation line (10 in FIG. 1) having a flexible pairing This is to minimize the space occupied.

Therefore, the loading space of the wind turbine installation line (10 in FIG. 1) having a flexible pairing can be maximized.

Although the above-described stretch pairing according to an embodiment of the present invention and a wind turbine installation line provided with the same, the spirit of the present invention is not limited to the embodiments presented herein, those skilled in the art to understand the spirit of the present invention Within the scope of the same idea, it will be able to easily propose another embodiment by the addition, change, deletion, addition, etc. of the components, but it will also be said to fall within the scope of the invention.

10: Wind turbine generator ship with telescopic pairing
11: hull 12: deck
13, 14: omnidirectional propeller 15: leg lift housing
16: Leg 17: landing base
18: pairing receiving portion 100: flexible pairing
110: upper plate 111: leg through hole
130: new building 150: rim
170: lower plate 171: leg through hole

Claims (11)

A streamlined lower plate coupled to the lower end of the leg installed to be lifted up and down on the hull of the wind turbine installation line; And
A lower end is coupled to an edge portion of the lower plate, an intermediate region covers the leg, and an upper end is coupled to the hull, and includes a flexible pipe having a streamlined cross section.
When the leg is lowered with respect to the hull the expansion tube is stretched, when the leg rises, the flexible tube is characterized in that the expansion tube is shortened.
The method of claim 1,
The expansion pipe is stretchable pairing, characterized in that a plurality of folds are folded when a compressive force is applied in the longitudinal direction.
The method of claim 2,
The flexible tube is a flexible pairing, characterized in that made of polyethylene or polypropylene.
The method of claim 1,
The lower plate is stretchable pairing, characterized in that the water permeable.
The method of claim 4, wherein
The lower plate is an elastic pairing, characterized in that consisting of a porous plate or a network structure.
The method of claim 1,
Flexible pairing characterized in that it further comprises a plurality of streamlined rims which are distributedly coupled to the inner surface or the outer surface of the flexible tube, so that the cross section of the flexible tube is maintained to be streamlined.
A leg installed on the hull so as to be lifted up and down; And
Including an elastic pairing according to any one of claims 1 to 6,
And a pairing receiving portion for accommodating the flexible tube shortened when the leg is raised.
The method of claim 7, wherein
Cross section of the pairing receiving portion is a wind turbine generator line having a flexible pairing, characterized in that the streamlined.
The method of claim 7, wherein
Wind generator installation line with a telescopic pairing characterized in that it further comprises an omnidirectional propeller installed on the hull.
The method of claim 7, wherein
And a landing base installed or formed at a lower end of the leg to protrude downwardly from the lower plate.
The method of claim 10,
The pairing receiving portion is a wind turbine generator, characterized in that the landing base is formed so as to accommodate when the leg is raised.

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