JP6617907B2 - Floating offshore wind power generator - Google Patents

Description

  The present invention relates to a floating wind power generator installed in a floating state on the ocean.

  Offshore wind power is attracting attention because there is no need to worry about noise pollution offshore, away from people's homes, and there are many advantages such as the ability to obtain larger wind power on average than onshore.

  In offshore wind power generation systems, there are known a landing-type form in which a foundation is constructed on the seabed and a floating-type form in which the foundation is suspended on the water surface in a moored state.

  Of these, for the landing type, the water depth of about 30 m is currently a construction limit, so the installation location is limited to the shallow sea.

  On the other hand, there is almost no restriction due to the water depth for the floating type as long as stable mooring is possible. For this reason, the floating body type is suitable for sea areas with little depth.

  Here, an example of a conventional floating offshore wind power generator (hereinafter simply referred to as “wind power generator”) is shown in FIG. In the wind power generator 100 of FIG. 8, a base body 102 that supports a power generation system using a windmill 101 is floated and arranged on the water by a plurality of floating bodies 103 and 104. In this wind power generator 100, the power generation efficiency is improved by rotating the nacelle portion 106, which is rotatably disposed on the support column 105 and attached with the windmill 101, in accordance with the direction of the wind. Such a wind power generator 100 is described in Patent Document 1.

JP 2002-285951 A

  By the way, since the large wind power generator can set the wind receiving position to a high position, it can stably receive strong winds in the sky and has high power generation efficiency. On the other hand, in a small wind power generator, since the wind receiving position is lowered, in addition to being unable to receive a stable and strong wind in the sky, the power generation efficiency is reduced by the amount of the wind receiving area. For this reason, in a small floating wind power generator of a floating body type, it is necessary to increase the movable efficiency by quickly following the wind direction according to the wind conditions.

  However, if a complicated rotating mechanism similar to that of a large-sized device is adopted for a small-sized device such as a large-sized device that cannot obtain the merit, it is disadvantageous in terms of cost.

  Then, an object of this invention is to provide the offshore wind power generator with a high followability of a wind direction by simple structure.

In order to achieve the above object, the floating offshore wind power generator of the present invention comprises:
A mooring pipe extending in the depth direction and having a lower side connected to the bottom of the water by a mooring line;
A first arm that is connected to the sea side of the mooring pipe via a centering bearing that is the center of inclination of the mooring pipe and the cover body, and extends in a horizontal direction so as to be relatively rotatable;
A floating body connected to the rotating end of the first arm;
A column erected on the floating body;
A windmill supported by the support;
A power generator installed on the floating body;
A first arm extending from the floating body and holding the underwater side of the mooring pipe in a loose state via a buffering material so as to be eccentric; and a second arm provided in a plane formed by the mooring pipe; ,
It is provided with.

  Further, in the floating offshore wind power generator according to the present invention, in addition to the above configuration, the cushioning material is a rubber plate in which a through hole capable of holding the lower side of the mooring pipe in a loose state is formed in the center. It is characterized by that.

  In addition to the above-described structure, the floating offshore wind power generator according to the present invention includes a mooring line that extends in a diameter-expanding direction from a lower side of the mooring pipe and is provided with a plurality of connecting rods that are equally provided in the circumferential direction. It is connected.

  As described above, according to the floating offshore wind power generator of the present invention, the first arm and the mooring pipe are connected via the aligning bearing. On the other hand, it can swing. Further, the mooring tube is held eccentrically in a loose state by the second arm extending from the floating body, so that it can rotate relative to the floating body with swinging.

  Further, according to the floating offshore wind power generator of the present invention, in addition to the above effect, the second arm loosely holds the lower side of the mooring pipe through the rubber plate, so that the eccentric action and the buffer can be achieved with a simple configuration. The action becomes possible.

  Moreover, according to the floating offshore wind power generator of the present invention, in addition to the above effects, the mooring line is connected to the connecting rod extending in the diameter-expanding direction from the lower side of the mooring pipe. Even when it is twisted, the tension acting on the mooring line acts as a force for rotating the connecting rod to its original position. Thereby, the rotational position of the mooring pipe can be stabilized within a certain range, and the large twisting of the mooring line can be prevented.

1 is an overall perspective view of a floating offshore wind power generator according to an embodiment of the present invention. It is an expansion perspective view by the partial fracture | rupture of the rotation mechanism part of the floating type offshore wind power generator of FIG. It is an expansion center longitudinal cross-sectional view which shows the effect | action of the rotation mechanism part of the floating body type offshore wind power generator of FIG. It is an expansion perspective view by the partial fracture | rupture of the buffer mechanism part of the floating body type offshore wind power generator of FIG. It is the top view which showed the relationship between the rotation operation of a mooring pipe, and a mooring line. It is a figure which shows a mode that the floating body and the mooring pipe inclined. It is a figure which shows the relationship between a floating body type offshore wind power generator and a wind. It is a general view which shows the conventional floating body type offshore wind power generator.

  Hereinafter, a floating offshore wind power generator (hereinafter simply referred to as a wind power generator) according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall perspective view of a wind turbine generator 1 according to an embodiment of the present invention. The wind turbine generator 1 according to the present embodiment includes a floating body 2 in which a cylindrical lower body 2b having a diameter smaller than that of the main body 2a is formed below the cylindrical main body 2a. The lower body 2b is configured to be longer in the vertical direction (depth direction) than the main body 2a and heavier in weight. By doing in this way, the restoring force with respect to the wave of the main body 2a is enlarged. A support column 3 is erected on the floating body 2.

  A nacelle 5 is provided at the upper end of the column 3, and a wind turbine 4 having a rotating shaft 4 a oriented in the horizontal direction is attached to the nacelle 5. A power generation device 6 is provided at the lower end of the column 3. Thus, in the wind turbine generator 1 according to the present embodiment, the stability of the floating body 2 is improved by mounting the power generator 6 on the floating body 2 instead of the nacelle 5.

  Further, since the power generation device 6 is provided on the floating body 2, the power generation device 6 can be easily maintained. When the power generation device 6 is provided in the nacelle 5, the maintenance is performed by climbing to the nacelle 5 on the support column 3 that is swayed by the wave, and the maintenance becomes difficult. The approximate position of the water surface when the floating body 2 is installed on the water surface is indicated by a dotted line on the side surface of the large-diameter portion of the floating body 2.

  A mooring pipe 7 extending in the water depth direction is juxtaposed in the vicinity of the floating body 2. The mooring tube 7 and the floating body 2 are connected to each other at two locations, upper and lower. Among these, the upper connection structure has a holding arm (first arm) 16 extending in the horizontal direction from the main body 2 a of the floating body 2. The holding arm 16 is fixed to the floating body 2 on the same axis as the rotating shaft 4a of the windmill 4 to which the windmill 4 is attached when viewed from above. In other words, the attaching direction 16a of the holding arm 16 of the floating body 2 and the rotating shaft 4a of the windmill 4 coincide when viewed from above.

  The holding arm 16 is connected to the mooring tube 7 via the rotation mechanism 8 so as to be relatively rotatable. The location where the holding arm (first arm) 16 is connected by the mooring pipe 7 is above the water surface. This is because the rotation mechanism unit 8 is a mechanical part, and therefore the degree of deterioration is smaller when it is at sea than at sea. The first arm 16 may be said to be on the sea side of the mooring pipe 7.

  In the connection structure on the lower side of the mooring tube 7, the buffer holding arm 28 (second arm) extends from the lower end of the lower body 2 b of the floating body 2 toward the mooring tube 7. The buffer holding arm 28 holds the lower side of the mooring pipe 7 in a loose state via a buffer material. The connection point between the buffer holding arm 28 and the mooring pipe 7 is in the sea. It may be said that the second arm 28 is on the underwater side.

  The mounting direction 28 a of the buffer holding arm 28 to the floating body 2 is the same direction as the mounting direction 16 a of the holding arm 16. Therefore, the rotating shaft 4a of the windmill 4 and the attaching direction 16a of the holding arm 16 and the attaching direction 28a of the buffer holding arm 28 are in the same plane. Further, the holding arm 16 and the buffer holding arm 28 are in the same plane as the rotating shaft 9 of the mooring tube 7. That is, the buffer holding arm 28 is in a plane formed by the holding arm 16 and the mooring tube 7.

  A connecting arm 34 is fixedly provided at the lower end of the mooring pipe 7. The connecting arm 34 is fixed to the seabed by a mooring line 36. Here, the case where there are three connection arms 34 is shown, but the number of connection arms 34 is not limited as long as it is one or more.

  Thus, since the floating body 2 is supported by the holding arm 16 and the buffer holding arm 28 between the mooring tube 7, the floating body 2 has the rotating shaft 9 indicated by a one-dot chain line at the center of the mooring tube 7. It is possible to swivel around (the swiveling direction is indicated by a curved arrow extending in a horizontal plane in FIG. 1). Further, it may be said that the floating body 2 is connected to the rotation ends of the holding arm 16 and the buffer holding arm 28.

  When the wind turbine 4 on the floating body 2 rotates, the wind power generator 1 transmits the rotational force to the power generating apparatus 6 on the floating body 2 by a transmission means such as a shaft (not shown). As a result, the power generation device 6 generates power. The electric power generated by the power generation device 6 is transmitted to the slip ring 13 through a cable arranged in the holding arm 16. The electric power is transmitted from the slip ring 13 to a cable disposed in the mooring pipe 7, and is transmitted to an embedded cable (not shown) disposed in the sea. In this way, the floating offshore wind turbine generator 1 transmits power.

  Next, a desirable operation of the floating offshore wind power generator 1 will be briefly described. FIG. 2 shows a view of the floating offshore wind power generator 1 as viewed from above. Assume that the mooring pipe 7, the floating body 2, the windmill 4, the connecting arm 34, and the mooring line 36 are in the relationship shown in FIG.

  Suppose that the wind W blew with reference to FIG.2 (b). Since the windmill 4 on the floating body 2 receives wind, the floating body 2 to which the windmill 4 is fixed generates a force Fr that turns around the mooring pipe 7. This is because the rotation axis of the windmill 4 is provided on the same axis as the holding arm 16 (buffer holding arm 28) connecting the mooring pipe 7 and the floating body 2. As a result, the floating body 2 turns around the mooring pipe 7 until the nacelle 5 faces the windward. In this way, the windmill 4 can always rotate in the direction of the wind to generate electricity.

  The problem here is the coefficient of friction during rotation between the mooring tube 7 and the floating body 2. When this coefficient of friction is large, the floating body 2 cannot turn around the mooring tube 7 and remains in the state shown in FIG. That is, the windmill 4 cannot always be directed to the wind.

  As a cause of the rotational friction coefficient between the mooring tube 7 and the floating body 2, the following may be considered. The mooring tube 7 and the floating body 2 are swung by waves. Therefore, the inclination of the floating body 2 with respect to the mooring pipe 7 always changes. Then, the friction coefficient becomes high at the portion of the rotation mechanism portion 8 in FIG. 1, and the floating body 2 cannot smoothly rotate around the mooring pipe 7. Therefore, the wind turbine generator 1 according to the present invention has a connection structure of the mooring tube 7 and the floating body 2 that can be rotated relative to each other even if the inclination of the mooring tube 7 and the floating body 2 changes.

  This connection structure is provided in the rotation mechanism portion 8 of the holding arm 16 and the buffer mechanism portion 20 of the buffer holding arm 28, which are connection structures between the mooring pipe 7.

  A detailed configuration of the rotation mechanism unit 8 will be described with reference to FIG. FIG. 3 shows a partially broken enlarged view of a circled portion X in FIG. Here, for convenience of explanation, a detailed support member attached to the holding arm 16 is not shown, and the relationship between the holding arm 16 and the mooring tube 7 is shown to be clear. Also, the structure of the wiring and the like inside the mooring tube 7 is not shown.

  The holding arm 16 is joined to the side surface of the cover body 10. A thrust bearing 12 may be provided on the bearing mounting table 17 on the upper surface of the cover body 10. This is because it is effective in supporting the weight of the slip ring 13.

  The thrust bearing 12 is preferable because it reduces friction in the axial direction between the mooring tube 7 and the upper surface of the cover body 10 (bearing mounting table 17). The upper washer 12a is fixed to the side surface of the mooring pipe 7 via a flange bush 11 (see FIG. 4). The lower cage 12 b is placed in a frame of a donut-shaped frame plate 17 a joined to the bearing mounting table 17. Since the thrust bearing 12 is configured in this manner, the mooring tube 7 is rotatable with respect to the floating body 2 (see FIG. 1) connected to the holding arm 16.

  A bearing fixing frame 18 is fixed to the lower surface side of the bearing mounting table 17 with bolts. The bearing fixing frame 18 is configured by joining an upper frame 18a and a lower frame 18b. The aligning bearing 14 is fixed between the upper frame 18a and the lower frame 18b.

  The outer ring 14 a of the aligning bearing 14 is sandwiched between the upper frame 18 a and the lower frame 18 b of the bearing fixing frame 18, and the inner ring 14 b is fixed to the side surface of the mooring pipe 7. Since it is configured in this way, the mooring tube 7 and the holding arm 16 (floating body) even when the mooring tube 7 and the holding arm 16 (floating body 2) are relatively swung (relatively inclined). The centering bearing 14 can be tilted around without disturbing the rotation of 2).

  Here, FIG. 4 shows an enlarged central longitudinal sectional view of the structure including the rotation mechanism portion 8. At the upper end of the mooring pipe 7, a slip ring 13 is provided for sending electric power sent from the power generator 6 of the floating body 2 to the wiring in the mooring pipe 7 (see also FIG. 1). FIG. 4 shows a state where the lower end side of the mooring pipe 7 is swung around the aligning bearing 14.

  The center line of the holding arm 16 (see FIG. 3) and the fixed cover body 10 is indicated by a two-dot chain line 54, and the center position of the inclined mooring pipe 7 is indicated by a one-dot chain line 52. That is, the two-dot chain line 54 represents the inclination of the cover body 10 (holding arm 16), and the one-dot chain line 52 represents the rotating shaft 9 of the mooring tube 7 shown in FIG. An angle 50 formed by the two-dot chain line 54 and the one-dot chain line 52 is an inclination formed by the mooring tube 7 and the cover body 10 (the holding arm 16 and the floating body 2 coupled thereto).

  This inclination 50 is inclined about the aligning bearing 14. Therefore, even if the floating body 2 and the mooring pipe 7 are swung by waves, the floating body 2 can be rotated around the mooring pipe 7 by the aligning bearing 14.

  In addition, since the inclination of the cover body 10 and the mooring pipe 7 is relative, the cover body 10 is horizontal (the two-dot chain line 54 is vertical). Further, in FIG. 4, the case where the mooring pipe 7 is not inclined is shown above the portion indicated by the symbol B, and the case where the mooring tube 7 is inclined is shown below the portion where the symbol B is. In order to understand the inclination well, the portion of the symbol B is described continuously. Therefore, the mooring tube 7 is not bent at the portion B.

  Returning to FIG. 3, the lower end of the slip ring 13 is connected to the upper end of the mooring tube 7 by a rubber tube 19. For this reason, as described above, even when the mooring tube 7 swings around the aligning bearing 14, the movement of the upper end is absorbed by the deformation of the rubber tube 19, and the connection relationship with the slip ring 13 is good. It is possible to keep on.

  Next, FIG. 5 shows a detailed configuration of the buffer mechanism 20 which is a connection portion of the floating body 2 and the mooring pipe 7 in the sea. FIG. 5 shows an enlarged view in which the portion Y surrounded by the two-dot chain line on the lower side (underwater) of the mooring tube 7 in FIG. 1 is partially broken.

  The buffer mechanism 20 includes a cylindrical cover body 22 and a rubber plate 24 (buffer material) arranged so as to close the upper portion of the cover body 22. A buffer holding arm 28 extending from the lower end of the floating body 2 is joined to the side surface of the cover body 22 as shown in FIG. In the center of the rubber plate 24, a hole is formed through which the mooring tube 7 can be placed in a loose state. A flange bush 26 is interposed between the mooring tube 7 and the rubber plate 24, and the sliding friction between the mooring tube 7 and the rubber plate 24 is reduced.

  That is, the buffer holding arm 28 (floating body 2) can be rotated around the mooring pipe 7 by the flange bush 26. Further, even if the buffer holding arm 28 and the mooring pipe 7 are inclined, the rubber plate 24 (buffer material) is deformed to hold the inclined state. As a result, even if the buffer holding arm 28 (floating body 2) and the mooring pipe 7 are inclined, they can be rotated with respect to each other.

  As described above, the rotation mechanism portion 8 of the holding arm 16 and the buffer mechanism portion 20 of the buffer holding arm 28, which are connecting structures between the floating body 2 and the mooring tube 7, are inclined with respect to the floating body 2. Even so, the rotational friction coefficient can be kept low.

  FIG. 6 shows the relationship between the floating body 2 and the mooring pipe 7. In addition, structures, such as the support | pillar 3 on the floating body 2, are abbreviate | omitted. The wind turbine generator 1 (see FIG. 1) is a mooring tube in which the windmill 4 is winded, the lower portion of the mooring tube 7 is pulled by the mooring cable 36, or the floating body 2 and the mooring tube 7 are swung by waves. 7 and the floating body 2 are inclined to each other. In FIG. 6, only the floating body 2 is shown tilted. A one-dot chain line 52 represents a line parallel to the rotation axis 9 (see FIG. 1) of the mooring tube 7. A two-point difference line 54 represents the central axis of the floating body 2.

  The buffer holding arm 28 connected to the floating body 2 below the mooring pipe 7 holds this inclination by deformation of the rubber plate 24. Therefore, the mooring tube 7 is inclined with respect to the floating body 2 around the aligning bearing 14. However, even if the floating body 2 and the mooring pipe 7 are inclined by the aligning bearing 14 and the flange bush 26, they can be rotated with respect to each other. In other words, the floating body 2 can swivel around the mooring tube 7 even if the angle with the mooring tube 7 changes (swings).

  Referring to FIG. 5 again, a connecting portion 30 is attached to the lower end of the mooring pipe 7. A shaft end receiving portion 32 that receives the lower end of the mooring pipe 7 is provided at the center of the connecting portion 30. Then, the three connecting arms 34 extend from the lower position of the shaft end receiving portion 32 so as to expand in the diameter increasing direction of the mooring tube 7. These connecting arms 34 are arranged at an angle of 120 degrees with respect to each other. A mooring line 36 is connected to the lower end of the connecting arm 34. One end of these mooring lines 36 is fixed to the bottom of the water.

  Next, the relationship between the mooring line 36 and the mooring pipe 7 or the floating body 2 will be described. As described in FIG. 2, in order for the floating offshore wind turbine generator 1 to always point the windmill 4 in the direction of the wind, it is necessary that the floating body 2 can turn around the mooring pipe 7. However, if the rotational friction coefficient between the mooring tube 7 and the floating body 2 is large, the floating body 2 cannot turn around the mooring tube 7. On the other hand, the rotational friction coefficient between the mooring tube 7 and the floating body 2 cannot be made zero.

  FIG. 7 is a top view of the floating offshore wind power generator 1 as in FIG. FIG. 7A shows a state where the windmill 4 faces the wind W. Referring to FIG. 7B, assume that the wind direction is changed to W1. The floating body 2 tends to go to the wind by the force that the windmill 4 receives from the wind. That is, the force Fr that the floating body 2 tries to rotate with respect to the mooring tube 7 is generated. As a result, the angle formed by the connecting arm 34 and the mooring line 36 changes.

  Since the mooring line 36 is a heavy string-like body (chain), a hanging curve is drawn between the connecting arm 34 and a fixed point on the seabed. In FIG. 7A, the angle formed by the connecting arm 34 and the mooring line 36 is 180 °, and the mooring line 36 and the mooring pipe 7 are in a suspended state. In other words, the suspension curve drawn by the mooring line 36 at this time can be said to be the minimum energy state of the mooring line 36 under the constraint condition of FIG.

  On the other hand, as shown in FIG. 7B, when the mooring pipe 7 is rotated by the floating body 2 without changing the angle between the floating body 2 and the mooring pipe 7, the mooring line 36 is lifted as a whole. It seems to have grown. Since the mooring line 36 tries to return to the minimum energy state by gravity, the mooring line 36 has a restoring force Ft. When viewed from above, it appears as if the mooring line 36 is about to contract.

  A rotational friction coefficient exists between the floating body 2 and the mooring pipe 7. If the restoring force Ft of the mooring line 36 is larger than this rotational friction coefficient, the floating body 2 turns around the mooring pipe 7, and the windmill 4 faces the wind direction W1 (see FIG. 7C).

  When the rotational friction coefficient is large, the mooring tube 7 and the floating body 2 are fixed, and the floating body is in a state where the restoring force Ft by the mooring line 36 and the force Fr that the floating body 2 tries to rotate around the mooring tube 7 are balanced. 2 stops (see FIG. 7D).

  In other words, in order to keep the wind turbine 4 of the floating offshore wind power generator 1 facing the wind, the rotational friction coefficient between the mooring pipe 7 and the floating body 2 is reduced and the restoring force Ft of the mooring line 36 is increased. It is also effective.

  In order to increase the restoring force Ft of the mooring line 36, the weight per unit length of the mooring line 36 is increased and the number is increased. Measures such as increasing the tension during suspension can be adopted.

  As described above, the wind turbine generator 1 according to the present embodiment cushions the deflection that becomes prominent by using a long member such as the mooring pipe 7 with the buffer mechanism unit 20 and tilts to the rotation mechanism unit 8. By using a possible aligning bearing 14, it is possible to maintain the wind direction tracking function in a stable state without hindering the rotational motion of turning around the mooring pipe 7 of the floating body 2.

  In the above embodiment, a configuration in which the rotating mechanism unit 8 is combined with the aligning bearing 14 and the thrust bearing 12 is shown as an example. However, if at least the aligning bearing 14 is provided, the mooring tube 7 can swing, so the thrust bearing 12 is not an essential configuration. Further, instead of the aligning bearing 14, a thrust self-aligning bearing or the like may be used. Furthermore, instead of the thrust bearing 12, a resin bearing may be used as long as friction can be reduced with respect to an axial load.

  In the above-described embodiment, a configuration in which three connection arms 34 extending in the diameter increasing direction from the lower end of the mooring pipe 7 are provided at an angle of 120 degrees in the circumferential direction is shown as an example. However, two or four or more may be provided as long as a plurality of them are provided. If at least two are provided, the mooring lines 36 can be held in an open state, so that the rotational force component acting on the connecting arm 34 from each mooring line 36 can be set large.

  Moreover, in said embodiment, the example which comprises the connection part 30 which connects the mooring rope 36 with the rod-shaped member (connection arm 34) extended in a diameter expansion direction was shown. However, a plate-like member may be used as long as the mooring line 36 can be connected to a position spaced apart from the mooring pipe 7 in the diameter increasing direction.

  Moreover, in said embodiment, the connection arm 34 showed as an example the structure arrange | positioned on the same horizontal surface in the diameter expansion direction of the mooring pipe 7. FIG. However, the plurality of connecting arms 34 may be provided on different horizontal planes.

  Further, in the above-described embodiment, the configuration in which the rubber plate 24 is used as the buffer material of the buffer mechanism unit 20 is shown as an example. However, as long as the mooring tube 7 can be held in a loose state and has a buffer function, a spring or the like may be used as the buffer material.

  In the above embodiment, the buffer holding arm 28 extends from the lower end of the floating body 2 as an example. However, as long as the buffer mechanism 20 can hold the lower end side of the mooring pipe 7, the floating body 2 side may be connected to a position other than the lower end.

  The present invention can be suitably used for offshore wind power generation.

DESCRIPTION OF SYMBOLS 1 Floating type offshore wind power generator 2 Floating body 3 Prop 4 Windmill 5 Nacelle 6 Power generator 7 Mooring pipe 8 Rotating mechanism part 9 Rotating shaft 10 Cover body 11 Flange bush 12 Thrust bearing 12a Bearing disc 12b Cage 13 Slip ring 14 Aligning bearing 14a Outer ring 14b Inner ring 16 Holding arm (first arm)
17 Bearing mounting base 17a Frame plate 18 Bearing fixed frame 18a Upper frame 18b Lower frame 19 Rubber tube 20 Buffer mechanism 22 Cover body 24 Rubber plate (buffer material)
26 Flange bush 28 Buffer holding arm (second arm)
30 connecting portion 32 shaft end receiving portion 34 connecting arm (connecting rod)
36 Mooring line 100 Wind power generator 101 Windmill 102 Base part 103, 104 Floating body 105 Post 106 Nacelle part

Claims (3)

A mooring pipe extending in the depth direction and having a lower side connected to the bottom of the water by a mooring line;
A first arm that is connected to the sea side of the mooring pipe via a centering bearing that is the center of inclination of the mooring pipe and the cover body, and extends in a horizontal direction so as to be relatively rotatable;
A floating body connected to the rotating end of the first arm;
A column erected on the floating body;
A windmill supported by the support;
A power generator installed on the floating body;
A first arm extending from the floating body and holding the underwater side of the mooring pipe in a loose state via a buffering material so as to be eccentric; and a second arm provided in a plane formed by the mooring pipe; ,
A floating offshore wind turbine generator characterized by comprising:   2. The floating offshore wind turbine generator according to claim 1, wherein the cushioning material is a rubber plate in which a through-hole capable of holding the underwater side of the mooring pipe in a floating state is formed in the center.   3. The floating type according to claim 1, wherein the mooring line is connected to a plurality of connecting rods that extend in the diameter-expanding direction from the lower side of the mooring pipe and are evenly provided in the circumferential direction. Offshore wind power generator.