KR101540395B1 - Non-contact power swivel compensating height difference - Google Patents

Abstract

A non-contact power swivel in which the height difference is compensated is disclosed. The non-contact type power swivel compensated for height difference according to an exemplary embodiment of the present invention includes a first coil unit for receiving a current from a power supply unit disposed in the floating structure and being rotatable together with the floating structure, A current is induced by a magnetic field formed in the first coil part, and the induced current is supplied to the turret side, and the turret is connected to the turret relatively rotating with the floating structure, A height difference judging section for detecting whether a height difference between the second coil section, the first coil section and the second coil section is generated and calculating a height difference degree, And a height difference compensating section for raising or lowering the first coil section or the second coil section.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a non-contact power swivel,

The present invention relates to a non-contact power swivel in which the height difference is compensated.

Generally, a drill ship or FPSO (floating oil production and storage facility) drilling gas or crude oil from the seabed is equipped with a turret to assist drilling.

The turret is usually mounted in a vertical opening or moon pool at one end of the ship, usually at the forefront, and secured to the subsea well platform by a chain or the like, thereby mooring the vessel.

Further, the turret is installed so that the ship can rotate around the turret. In other words, the turret is fixed to the platform of the submarine channel, and a sliding bearing is interposed between the turret and the vertical opening (the portal) of the ship, so that the ship can rotate naturally around the turret by the action of wind, have. This allows the gas or crude oil to be stably transported to the ship side through a pipe or the like in the fixed turret, even if wind, tide or wave acts during the drilling operation.

The turret may be provided with a swivel stack including a plurality of swivels. Each swivel is placed vertically, like a tower, and the drilled gas or crude oil can be transferred to each part of the ship through this swivel stack. Each swivel is connected to the turret so that the inner side is fixed like a turret, and the outer side is connected with the hull so that it can rotate together with the ship when the ship rotates around the turret.

In general, a torque arm is connected to the outer side of the swivel, so that when the outer side of the swivel rotates together with the ship, the load is not transmitted to the piping connection site, so that the outer side of the swivel can rotate easily .

On the other hand, the turret may be equipped with a variety of equipment requiring power. For example, a winch, a lighting device, a thermal device, various sensors, and the like can be installed in each part of the turret, and a method of supplying electric power to them is required.

Currently, the slip-ring method is the most widely used. That is, by using a specific swivel of the swivel stack as a slip ring (or employing a slip ring for a specific swivel), the inner stator of the slip ring is connected to the turret, and the outer rotor of the slip ring is connected to the hull. When the ship rotates about the turret, the inner stator of the slip ring is fixed while the outer rotor can rotate around the inner stator. This allows the power applied to the external rotor to be transmitted to the internal stator and then to the various devices of the turret.

However, since the slip ring type power transmission method as described above transmits electric power by the physical contact between the inner stator and the outer rotor, when the ship rotates around the turret, it necessarily involves abrasion due to friction I can not help it. Therefore, periodic maintenance work is required to solve this problem. In addition, when the contact point between the rotor and the stator of the slip ring drops due to the instantaneous movement of the ship, there is a possibility that a spark occurs, and there is a high possibility that gas, vapor, and the like are present around the slip ring, .

US Patent Application Publication No. 7806708

An embodiment of the present invention is to provide a non-contact power swivel capable of supplying power to a turret in a non-contact manner.

The embodiments of the present invention are also intended to provide a non-contact power swivel which is free from the risk of abrasion or sparking due to friction.

Further, the embodiment of the present invention is to provide a non-contact type power swivel which is easy to maintain.

Further, an embodiment of the present invention is to provide a non-contact type power swivel in which the steady state is maintained and the height difference is compensated.

A power swivel according to an aspect of the present invention includes a first coil part connected to a floating structure and rotatable together with the floating structure and receiving a current from a power supply part disposed in the floating structure, A second coil part connected to a turret relatively rotating with the first coil part and spaced apart from the first coil part by a predetermined distance, a current is induced by a magnetic field formed in the first coil part to supply the induced current to the turret side, A height difference judging section for detecting whether a height difference between the first coil section and the second coil section is generated and calculating a height difference degree and a height difference judging section for judging whether the first coil section or the second coil section is on the basis of the height difference calculated by the height difference judging section And a height difference compensating unit for raising or lowering the second coil unit.

A tilting determination unit for detecting whether the first coil part and the second coil part are inclined or not and calculating a tilting degree, and a controller for controlling the inclination of the first coil part and the second coil part based on the tilting sensed by the tilting determination part, Or a driver for tilting the second coil part.

The height difference determination unit may detect whether a height difference between the first coil part and the second coil part occurs through measuring the intensity of the magnetic field around the second coil part along the height direction of the second coil part , And the height difference can be calculated.

The second coil portion includes a column portion, an upper plate disposed on the upper portion of the column portion, and a lower plate disposed on a lower portion of the column portion, wherein the height difference determination portion determines the height difference between the upper surface of the upper plate, And a plurality of magnetic field measuring devices respectively disposed on the upper surface of the lower plate and the lower surface of the lower plate.

The height difference judging unit may compare the strengths of the magnetic fields measured on the upper surface and the lower surface of the upper plate with each other and compare the strengths of the magnetic fields measured on the upper and lower surfaces of the lower plate with each other, It is possible to detect whether or not a height difference has occurred between the coil parts.

The height difference determination unit may determine that the difference in intensity of the magnetic field measured on the upper surface and the lower surface of the upper plate exceeds a predetermined value and the difference in intensity of the magnetic field measured on the upper surface and lower surface of the lower plate, , It can be determined that a height difference has occurred between the first coil part and the second coil part.

When the height difference determining unit determines that a height difference has occurred between the first coil part and the second coil part, the magnetic field measured on the upper surface of the upper plate is larger than the magnetic field measured on the lower surface of the upper plate, Wherein the height difference compensating unit descends the first coil part and the magnetic field measured on the upper surface of the upper plate is smaller than the magnetic field measured on the lower surface of the upper plate and the magnetic field measured on the lower surface of the upper plate is smaller than the magnetic field measured on the lower surface of the lower plate, When the magnetic field measured on the upper surface of the lower plate is smaller than the magnetic field measured on the lower surface of the lower plate, the height difference compensating unit can raise the first coil part.

The height difference compensating unit may include an actuator disposed at a lower portion of the first coil portion to move the first coil portion upward or downward by advancing or retracting.

According to the embodiment of the present invention, it is possible to provide a non-contact type power swivel capable of supplying power to the turret in a non-contact manner.

Further, it is possible to provide a non-contact type power swivel which is free from the risk of abrasion or sparking due to friction.

Further, it is possible to provide a non-contact type power swivel which is easy to maintain.

Further, it is possible to provide a non-contact type power swivel in which the steady state is maintained and the height difference is compensated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically shows the construction of a general swivel stack; FIG.
2 is a view illustrating the inside and outside of the center of a non-contact type power swivel according to an embodiment of the present invention.
Figures 3 to 5 schematically illustrate a non-contact power swivel according to another embodiment of the present invention.
6 is a schematic illustration of a non-contact power swivel according to another embodiment of the present invention.
Figure 7 is a flow chart of the embodiment of Figure 6;
8 and 9 schematically illustrate a non-contact power swivel according to another embodiment of the present invention.

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

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

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

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a non-contact power swivel according to embodiments of the present invention will be described as being provided on a turret installed in a ship, but the present invention is not limited thereto. The non-contact power swivel according to embodiments of the present invention can be equally applied to various floating structures such as an offshore plant as well as a ship.

Further, the non-contact power swivel according to embodiments of the present invention may be disposed at the upper end of the swivel stack of the turret, or may be disposed at the middle portion rather than the upper end. In addition, the non-contact power swivel according to embodiments of the present invention may be located at a location other than the turret.

Before describing the present invention in more detail, the operation of the ship centered on the turret and the turret will be described.

Turrets may be equipped with floating structures that drill gas or crude oil from the seabed, such as drill rigs or FPSO (Floating Crude Oil Production Cargo Storage Facility). It may be divided into an internal turret or an external turret depending on where the hull is located.

The turret allows the ship to freely rotate about the turret when the ship flows by the action of wind, tide or wave while the gas or crude oil is being transported. The gas or crude oil, It can be stably transported to the ship side through the piping of the ship. For example, there is no possibility that various pipes such as a riser are caught by the flow of the ship.

In the case of an inner turret, a vertical opening (a portal) through the hull can be formed inside the vessel, and the turret can be installed in such a vertical opening. The vertical opening may be provided with a plurality of bearings such that the hull is rotatable about the turret. That is, the one side and the other side of each bearing can contact the hull and the turret, respectively, to perform rolling motion, thereby helping to smoothly implement the relative rotational movement of the hull and the turret.

The turret may comprise a bottom turret, a top turret, a piping deck, a mezzanine deck, a gantry crane, and the like, in the above order from below. Gantry cranes are equipment for the unloading of drilled gas or crude oil. Swivel stacks and utility pipes connected to the gantry crane can be installed in the support structure of the gantry crane. Utility pipes can be supported by piping decks and mezzanine decks, one side can be connected to each part of the vessel and the drilled crude oil or gas can be transferred to each part of the vessel. The other side of the utility pipe can be connected to a riser installed in the turret. The riser is connected to a submarine block platform so that the gas or crude oil from the block can be transferred to the utility pipe through the riser.

1 is a view schematically showing the construction of a general swivel stack.

As shown, the swivel stack has a plurality of swivels arranged in the vertical direction. The bottom-most swivel may be a production swivel 10. It can receive crude oil or gas from a riser installed in the turret and transfer it to the hull via a utility pipe. Above the production swivel 10 there are a water injection swivel 20, a fire water swivel 30, a gas lift and injection swivel 40, a utility swivel 50, 60, Various swivels can be arranged. As such, each swivel included in the swivel stack performs its function and can safely transport crude oil or gas drilled from the seabed to the hull.

Meanwhile, as shown in FIG. 1, power is supplied to the turret including the swivel stack through the slip ring 70 in the conventional case. The slip ring 70 is typically disposed at the upper end of the swivel stack and is connected to the torque arm 71 connected to the hull 1 so that the outer rotor of the slip ring 70 can rotate with the ship, Because it is connected to the turret, it does not rotate with the ship when the ship rotates.

As described above, in such a slip ring type power supply structure, since the rotor and the stator of the slip ring 70 are in contact with each other, when the ship rotates around the turret, problems such as abrasion due to friction May occur. In addition, if the contact between the rotor and the stator is dropped due to the momentary movement of the ship, sparks may occur and a fire risk may occur. Therefore, as described below, a non-contact type power swivel capable of supplying power to the turret side without such a problem even when the ship rotates around the turret has been devised.

FIG. 2 is a view illustrating the inside and outside of the non-contact type power swivel 100 according to the embodiment of the present invention.

2, the non-contact type power swivel 100 according to the present embodiment includes two first coil portions 120 disposed at both sides of the second coil portion 120 with the second coil portion 120 at the center, However, the present invention is not limited thereto, and the first coil portion may be provided as one or more than three.

The first coil portion 110 is disposed on one side of the second coil portion 120 and may be spaced a predetermined distance from the second coil portion 120. The other first coil part 111 is also disposed on the other side of the second coil part and can be spaced apart from the second coil part 120 by a predetermined distance.

The first coil parts 110 and 111 may have a C-shaped cross-section, and the first coil 115 and 116 may be wound on the middle vertical member. In addition, the second coil part 120 may include a disc member at the upper and lower ends and a cylindrical member at the center, and the second coil 125 may be wound around the cylindrical member.

The first and second coils 115 and 116 and the second coil 125 wound on the first coil part 110 and the second coil part 120 respectively have through holes 135 Through the through hole 145 formed in the second case 140 and the non-contact type power swivel 100, or may be discharged to the outside. The through holes 135 and 145 will be described later.

2, the cross-sectional shape of the first case 130 may be a cross-sectional shape, and the cross-sectional shape of the first cross-sectional shape may extend 360 degrees about the central portion of the non-contact type power swivel 100, A hollow portion may be formed inside and an upper portion may be opened. However, the center of the lower surface of the first case 130 may penetrate, and the second case 140 may be disposed at the penetrating portion as described later to support the second coil portion 120.

In this embodiment, the first case 130 having the above-described shape can support the lower end portion and the side portion of the first coil portion 110. For example, as shown in FIG. 2, a lower horizontal member of the first coil portion 110 of the C shape can be supported from below, and a central vertical member of the C shape first coil portion 110 And can be supported from the outside to the inside of the non-contact power swivel 100.

Since the first coil 115 can be wound on the center vertical member of the first coil part 110, the part where the first coil 115 is wound on the first coil part 110 can be wound around the first case 130 You may not touch them directly. In this case, one ends of a plurality of insulators (not shown) are connected to a plurality of points of the first coil part 110, respectively, and the other ends of the plurality of insulators are connected to inner surfaces of the first case 130 The first coil part 110 can be completely supported by the first case 130 and can be fixed to the corresponding position and can not be moved even during the rotation operation.

The first case 130 is in direct contact with the lower end of the first coil part 110 to support the first coil part 110. However, An insulator may be interposed between the cases 130 as well.

The second case 140 can support the second coil part 120. In this embodiment, the second coil part 120 is disposed at the center of the non-contact type power swivel 100, 140 may form a lower center portion of the non-contact type power swivel 100.

The second case 140 is embodied as a disk in this embodiment and can act to support the lower end of the second coil part 120 from below. An insulator may be interposed between the second coil part 120 and the second case 140, as in the case of the first coil part 110 and the first case 130.

Meanwhile, other swivels of the swivel stack may be positioned under the first case 130 and the second case 140, and an upper turret, a lower turret, and the like may be disposed below the other swivels. As will be described later, the first case 130 is connected to the hull so that the first case 130 can rotate together with the ship when the ship rotates about the turret. The second case 140 may be connected to the turret so that the second case 140 may not rotate as the turret rotates about the turret.

The cover 150 may be a disc. The cover 150 may cover the upper end of the first coil part 110 and the second coil part 120 after the first coil part 110 and the second coil part 120 are disposed in the non-contact type power swivel 100. [ The cover 150 and the first coil part 110 may be spaced apart from each other by an insulator interposed between the cover 150 and the upper end of the first coil part 110. Meanwhile, in the present embodiment, the upper end of the second coil part 120 may be spaced apart from the cover 150 by a predetermined distance.

On the other hand, the non-contact power swivel 100 may be located at the top (or top) of the swivel stack. However, the present invention is not limited thereto, and other swivels may be arranged above the non-contact type power swivel 100. [ Accordingly, the upper surface of the cover 150 can be connected to another swivel. Further, as will be described later, the cover 150 is connected to the hull so that it can rotate together with the ship when the hull rotates about the turret.

Referring to FIG. 2, it can be seen that the lower end of the first case 130 and the end of the second case 140 are not in direct contact with each other. As mentioned above, the first case 130 and the cover 150 are connected to the hull so as to rotate together with the ship, while the second case 140 does not rotate together with the ship. Accordingly, the first case 130 and the second case 140 can rotate relative to each other. In order to smoothly support the first case 130 and the second case 140, the lower end of the first case 130 and the end of the second case 140 A bearing portion 170 may be disposed between the first and second bearings.

The bearing portion 170 may support the relative rotation of the first case 140 and the second case 150.

Hereinafter, an operation of the non-contact type power swivel 100 according to the present embodiment will be described.

The power supply unit 1000 disposed on the ship can apply current to the first coil part 110, more specifically, the first coil 115 of the first coil part 110. [ The current flowing along the first coil 115 wound on the first coil part 110 can form a magnetic field on the first coil part 110 and the second coil part 115 disposed adjacent to the first coil part 110, A magnetic field in a direction opposite to the magnetic field formed in the first coil part 110 may be induced in the part 120. [ According to the induced magnetic field, a current can be induced to flow through the second coil 125 of the second coil part 120. [ The current induced in the second coil 125 can be used to operate various turret loads 2000 (e.g., winches, illuminators, heaters, sensors, etc.) supplied to the turret side and located in the turret.

On the other hand, when the ship rotates about the turret, since the first coil part 110 is connected to the ship, it rotates together with the ship. On the other hand, since the second coil part 120 is connected to the turret, It is fixed without rotating together. That is, the first coil part 110 and the second coil part 120 can also rotate relative to each other, and if the first coil part 110 and the second coil part 120 are rotated according to the present embodiment, The current can be induced in the second coil part 120. Therefore, unlike the conventional slip ring, even when the ship rotates, there is no possibility of causing problems such as abrasion due to friction between the rotor and the stator. As a result, the rotor and the stator are not in contact with each other, so there is no possibility of sparking due to the momentary disconnection of the rotor and the stator.

The inner space 180 of the non-contact type power swivel 100 partitioned by the first case 130, the second case 140, the bearing part 170, and the cover 150 may be filled with insulating oil. The first coil portion 110 and the second coil portion 120 can be kept apart from each other by a predetermined distance by the insulating oil.

As described above, a plurality of through holes 135 and 145 may be formed in the first case 130 and the second case 140, respectively. The through holes 135 and 145 may provide a passage through which the first coil 115 and the second coil 125 are drawn into or out of the non-contact type power swivel 100. The through holes 135 and 145 are formed in the first case 130 and the second case 140 so that both ends of the first coil 115 and the second coil 125 can be separately inserted and discharged, Respectively.

The through holes 135 and 145 may be separated from the first coil 115 or the second coil 125 by a separate sealing member. For example, it is possible to prevent the access of various flammable substances and moisture which may cause a fire, thereby improving the operational stability. In addition, when the inner space of the non-contact type power swivel 100 is filled with the insulating oil, it may prevent the leakage of the insulating oil.

Hereinafter, a situation in which the first coil portion and the second coil portion are inclined at a predetermined angle with respect to each other will be described. The turret is fixed to the bottom of the underwater hole and can be supported by the bearing part installed in the vertical opening of the ship. However, the turret can be tilted at a certain angle with respect to the ship by the effect of instantaneous winds and waves.

Thus, when the turret is inclined, the second coil portion connected to the turret is also inclined together. In this state, the separation distance between the first coil portion and the second coil portion may be changed, and the power supply efficiency may be deteriorated. In addition, when the tilting is severe, the first coil part and the second coil part may be in contact with each other, which may cause problems as in the prior art.

Thus, as described above, the following embodiments relate to a non-contact power swivel where stationarity can be maintained, where steady state means that the first coil part and the second coil part maintain an initial steady state That is, the first coil part and the second coil part are parallel to each other, and the distance between them is kept the same.

In the following description, it is assumed that the second coil portion is inclined with respect to the first coil portion. However, the present invention is not limited thereto, and the first coil portion may be inclined with respect to the second coil portion. The present invention is equally applicable. For example, while the turret is fixed to a submarine block platform, the vessel can be instantaneously tilted with respect to the turret by the action of wind or wave.

The non-contact power swivel according to the present invention includes an inclination determining unit that determines whether a tilting occurs and a tilting degree when a relative tilting occurs between a first coil part and a second coil part, And a driver capable of tilting any one of the first coil part and the second coil part that is not tilted based on the information on the tilt angle and the inclination detected by the tilting determination part have. Therefore, relative tilting between the first coil part and the second coil part that can occur instantaneously by the action of wind or wave can be prevented and the steady state can be maintained, so that the occurrence of a problem due to the tilting can be prevented in advance.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 3 to 6, other elements such as the first and second cases, the cover and the like are omitted for clearly showing the tilting relationship between the first coil part and the second coil part, and the first coil part, The second coil part and the driving part are mainly shown.

3 is a schematic view of a non-contact power swivel 200 according to another embodiment of the present invention. In this embodiment, the tilting of the second coil part 220 can be prevented by using the restoring force of the elastic body. In other words, when the second coil part 220 tends to tilt through the elastic body between the second coil part 220 and the hull, the elastic body acts to restrain the second coil part 220, 220 to return to the home position. In addition, when it is difficult to position the second coil part 220 just by the restoring force of the elastic body, the first coil part 210 may be tilted and disposed parallel to the second coil part 220.

Referring to FIG. 3, it can be seen that the second coil part 220 tilts in a counterclockwise direction. The first elastic body 290 and the second elastic body 291 may be interposed between the upper surface of the hull 1 and the upper surface of the second coil section 220. In this embodiment, Specifically, one end and the other end of each of the first elastic body 290 and the second elastic body 291 may be respectively connected to the upper surfaces of the hull 1 and the second coil part 220. The first elastic body 290 and the second elastic body 291 may be disposed symmetrically with respect to the center of the second coil part 220.

3, the first elastic body 290 connected to the left side of the upper surface of the second coil part 220 (left side with respect to the center) is compressed The length of the second coil part 220 can be shortened, and thus the compression restoring force in the direction of the left arrow can be provided to the second coil part 220. The second elastic body 291 connected to the right side of the upper surface of the second coil part 220 (right side with respect to the middle part) is elongated and can be extended in length, The tensile restoring force in the direction of the arrow can be provided.

As the first elastic body 290 on the left side pushes the second coil portion 220 in the direction opposite to the tilting direction and the second elastic body 291 on the right side pushes the second coil portion 220, The inclination of the second coil portion 220 can be prevented.

Fig. 4 is a perspective view (a) and a sectional view (b) showing the configuration not shown in Fig. 3 in the embodiment of Fig. As shown, the second coil part 220 may include a column 220a, an upper plate 220b, and a lower plate (not shown). The columnar portion 220a may have a cylindrical shape, and the upper plate 220b and the lower plate may be in the form of a disk. Here, on the upper surface of the upper plate 220b, the receiving portion may be formed as a circular depression, and a disk-shaped rotary portion 225 may be disposed in the circular receiving portion. The diameter of the rotation part 225 may be smaller than the diameter of the circular receiving part and a bearing member 226 contacting both the rotation part 225 and the receiving part may be disposed in the space between the rotation part 225 and the receiving part . The bearing member 226 is not limited as long as it can smoothly support the relative rotation between the rotation part 225 and the upper plate 220b of the second coil part 220 such as a roller bearing and a ball bearing. Both ends of the elastic members 290 and 291 may be connected to the cover 250 and the rotation unit 225, respectively.

As described above, the second coil part 220 does not rotate when the hull 1 rotates, but the cover 250 can rotate together with the hull 1 because it is connected to the hull 1 side. Therefore, one end of the elastic members 290 and 291 connected to the cover 250 can rotate together with the hull 1. One end of the elastic body 290 or 291 rotates together with the hull 1 and the other end of the elastic body 290 or 291 rotates along with the rotation of the hull 1 if the rotation part 225 and the bearing member 226 are not included, The elastic members 290 and 291 may be twisted or broken. However, in this embodiment, the other end of the elastic members 290 and 291 can be connected to the rotation part 225, and the bearing member 226 is interposed between the rotation part 225 and the upper plate 220b, The rotation part 225 can also rotate together. Therefore, the possibility of twisting or breakage of the elastic members 290 and 291 can be eliminated.

However, it may be difficult to return the second coil part 220 to the correct position only by the restoring force of the elastic members 290 and 291 according to the degree of inclination and the tilting speed. That is, since the tendency of the second coil part 220 to tilt is greater than the restoring force of the elastic members 290 and 291, it is difficult to prevent the second coil part 220 from tilting only by the elastic members 290 and 291, The second coil part 220 may not be positioned properly but may be tilted together with the first coil part 220 in a situation where breakage may occur at the connection part of the second coil part 220 with the turret .

For example, the non-contact power swivel 200 may include a tilt determination unit and a driving unit. Here, the tilting determination unit can detect whether the second coil unit 220 is tilted or not, and calculate the tilted angle.

In the case of the present embodiment, the inclination determining section may be exemplified as including a first elastic body 290, a second elastic body 291, and a calculation section. The first elastic member 290 and the second elastic member 291 are as described above and the operation unit can calculate the length difference between the first elastic member 290 and the second elastic member 291 . In the case of the above example, the first elastic body 290 is compressed and the second elastic body 291 is extended, both of which will have a length difference. The operation unit can sense that the second coil part 220 is inclined by grasping the difference in length itself between the first elastic body 290 and the second elastic body 291. It is also possible to determine to what degree (at what degree) the second coil part 220 is tilted by the degree of the difference in length between the first elastic body 290 and the second elastic body 291. It is also possible to determine whether the second coil part 220 can be positively positioned only by the restoring forces of the elastic members 290 and 291 based on the difference in length between the first elastic body 290 and the second elastic body 291, It can be determined whether it is desirable to tilt the first coil section 210 to maintain steady state. These criteria can be previously set in advance in consideration of the weight, mechanical relationship, and the like of each member, and input and stored in the operation unit.

Such an arithmetic unit may include known length measuring means of various types capable of measuring the lengths of the elastic members 290 and 291 and the length of the elastic members 290 and 291 in the steady state and the lengths of the elastic members 290 and 291 And information such as the angle change of the elastic bodies 290 and 291 and the second coil part 220 according to the change of the length of the elastic body 290 and 291 can be stored in advance. And a calculation device capable of calculating the tilted angle of the second coil part 220 using the length information of the actually measured elastic members 290 and 291.

As described above, when the first coil part 210 needs to be tilted by a difference in length between the first elastic body 290 and the second elastic body 291 exceeding a preset reference, the driving part moves the first coil part 210 It can be tilted. For example, the driving unit may include a plurality of actuators 215 and 216, which may be continuously arranged along the horizontal direction with reference to Fig. The first coil part 210 can be tilted by different advancement and retraction of the plurality of actuators 215 and 216, respectively. For example, when the first coil part 210 is tilted in the counterclockwise direction, the actuator 215 on the left side in Fig. 3 can maintain the initial state or can be retreated downward, and the actuator 216 on the right side can be moved upward You can advance.

The coil portion of the first coil portion 210 and the second coil portion 220, more specifically the coil portion of the first coil portion 210 and the coil of the second coil portion 220, And the distance between the first coil part 210 and the second coil part 220 can be maintained to be the same. This can be seen in FIG.

The inclination determination method using the optical sensor is also shown in FIG. As shown in FIG. 3, the optical sensors 80 and 81 may be attached to the first coil part 210 and the second coil part 220, respectively, The distance between the first coil part 210 and the second coil part 220 can be calculated. The distance between the optical sensors on both sides can be narrowed as the second coil portion 220 is tilted so that the optical sensors 80 and 81 can be positioned between the first coil portion 210 and the second coil portion 220 ) Of the second coil part 220 can be detected based on the distance information and the angle of inclination of the second coil part 220 can be calculated based on the distance information. For example, the optical sensors 80 and 81 may be provided in a plurality of locations and may be spaced apart from each other along the height direction of the first coil part 210 and the second coil part 220, respectively. The first and second coil parts 210 and 220 are vertically arranged in the initial steady state and are horizontally aligned with respect to each other, and the plurality of optical sensors are arranged on the first coil part 210 and the second coil part 220, Information regarding which point (height relation) of the coil part 220 is disposed can be stored. When the second coil part 220 is inclined counterclockwise, for example, a decrease in the spacing distance is detected in the upper optical sensor set and an increase in the spacing distance is detected in the lower optical sensor set . The operation unit compares the change information of the distance sensed by each of the plurality of optical sensors spaced apart along the height direction of the first coil part 210 and the second coil part 220, The angle of inclination of the second coil part 220 can be calculated by comparing the posture of the second coil part 220 with the initial steady state of the second coil part 220. [

In addition, a tilt angle of the second coil part 220 may be determined by using various tilt sensors capable of detecting and measuring a tilt, such as a gyroscope sensor and an accelerometer.

5, a height difference h may be generated between the first coil part 210 and the second coil part 220 according to the tilting of the first coil part 210. As shown in FIG. The magnetic field formed by the current flowing in the first coil part 210 is guided to the second coil part 220. When the height difference h is generated as described above, It may not be properly guided to the coil part 220, which means that the efficiency of power supply to the turret side may ultimately be reduced. Therefore, an embodiment capable of compensating for the height difference as described above will be described below.

In order to compensate for the height difference between the first coil part and the second coil part, in the following embodiments, the intensity of the magnetic field around the second coil part is measured along the height direction of the second coil part, A method of compensating a height difference by raising and lowering a first coil part after sensing whether a height difference between a first coil part and a second coil part is generated is proposed.

FIG. 6 is a schematic view of a non-contact type power swivel 300 according to another embodiment of the present invention, and FIG. 7 is a flowchart of the embodiment of FIG.

6, the second coil part 320 includes a column part 320a, an upper plate 320b disposed above the column part 320a, and a lower plate 320c disposed below the column part 320a. And may have an overall I-shape. The first coil portion 310 includes a vertical member 310a, an upper member 310b extending from the upper portion of the vertical member 310a toward the second coil portion 320 side, And a lower end portion 310c extending toward the second coil portion 320 side.

The first coil can be wound on the vertical member 310a of the first coil part 310 and the second coil can be wound on the column part 320a of the second coil part 320 .

A plurality of magnetic field measuring devices may be disposed on the second coil part 320 along the height direction of the second coil part 320. 6, a first magnetic field measuring device (a) is mounted on the upper surface of the upper plate 320b, a second magnetic field measuring device (b) is mounted on the lower surface of the upper plate, And the fourth magnetic field measuring device (d) may be disposed on the lower surface of the lower plate, respectively. These magnetic field measuring devices (a to d) can measure the intensity of the magnetic field induced in the second coil part 320 at the position where they are respectively disposed.

Referring to FIG. 7 together with the operation of the non-contact type power swivel 300 according to the present embodiment, the height difference determination unit determines the intensity of the magnetic field measured by the first magnetic field measuring apparatus (a) and the second magnetic field measuring apparatus And the intensity of the magnetic field measured by the third magnetic field measuring device (c) and the fourth magnetic field measuring device (d) can be compared. If there is no height difference h between the first coil part 310 and the second coil part 320, the intensity of the magnetic field measured by the first magnetic field measuring device (a) and the second magnetic field measuring device (b) , And the intensity of the magnetic field measured by the third magnetic field measuring device (c) and the fourth magnetic field measuring device (d) may be the same.

The height difference judging section judges that the absolute value of the difference of the magnetic field intensities measured by the first magnetic field measuring device (a) and the second magnetic field measuring device (b) exceeds the preset reference value, It is possible to judge that a height difference has occurred between the first coil part 310 and the second coil part 320 when the absolute value of the difference of the magnetic field strength measured by the four magnetic field measuring device d exceeds the preset reference value have. The predetermined reference value may be varied according to the operating environment. If the difference in height is slightly generated, the reference value may be set to zero to compensate for the difference in height, and otherwise, a suitable value may be set.

When the height difference determining unit determines that a height difference h is generated between the first coil unit 310 and the second coil unit 320 according to the above process, And the intensity of the magnetic field measured by the second magnetic field measuring device (b) can be compared with each other. In addition, the intensity of the magnetic field measured by the third magnetic field measuring device (c) can be compared with the intensity of the magnetic field measured by the fourth magnetic field measuring device (d).

6, when the first coil part 310 is higher than the second coil part 320, the intensity of the magnetic field measured by the first magnetic field measuring device (a) is higher than that of the second magnetic field measuring device (b) Is greater than the intensity of the magnetic field measured by the magnetic field. Also, the intensity of the magnetic field measured by the third magnetic field measuring device (c) is greater than the intensity of the magnetic field measured by the fourth magnetic field measuring device (d). Accordingly, in the case where such a result is calculated, the height difference judging unit can instruct the height difference compensating unit to lower the first coil unit 310.

Conversely, when the intensity of the magnetic field measured by the first magnetic field measuring device (a) is smaller than the intensity of the magnetic field measured by the second magnetic field measuring device (b) and the intensity of the magnetic field measured by the third magnetic field measuring device Corresponds to the case where the first coil part 310 is lower than the second coil part 320 when the intensity is smaller than the intensity of the magnetic field measured by the fourth magnetic field measuring device d, The unit can command the height difference compensation unit to raise the first coil unit 310. [

The height difference compensation unit may include actuators 315 and 316 disposed under the first coil part 310. [ These actuators 315 and 316 can raise the first coil part 310 by the upward advancing operation and can lower the first coil part 320 by the downward retraction operation.

8 and 9 are views schematically showing a non-contact type power swivel 400 according to another embodiment of the present invention. Here, unlike the above-described embodiment, the second coil part 420 is lowered from the initial steady state position without being inclined (actually, the first coil part 410 is moved to the second coil part 420 in accordance with the flow of the ship, (I.e., rising with respect to the battery 420).

The ship 1 can be raised or lowered with respect to the turret by the action of wind, waves and waves. In this case, a height difference may occur between the first coil part 410 and the second coil part 420, and the power feeding efficiency may be lowered.

As shown in FIG. 8, a relative height difference may occur between the first coil part 410 and the second coil part 420 according to the flow of the ship 1, and for convenience of explanation, The first coil portion 410 maintains the initial steady state and the second coil portion 420 descends.

In this case, a method of compensating the height difference after measuring the intensity of the magnetic field along the height direction of the second coil part 420 may be applied, as in the embodiment described with reference to FIG.

9, by moving the actuators 415 and 416 provided at the lower end of the first coil part 410 backward, the first coil part 410 is lowered to move the first coil part 410 and the second coil part 410, It can be seen that the height difference between the coil portions 420 is offset.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It will be understood that various changes, modifications, or substitutions may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

For example, in the above description, the first coil portion is raised or lowered to compensate for the height difference. However, the second coil portion can be raised or lowered, and both the first coil portion and the second coil portion can be raised or lowered . Similarly, although the first coil portion is described as being tilted when the second coil portion is inclined, the first coil portion may be inclined, and at this time, the second coil portion may be inclined together.

1000: Power supply unit 2000: Turret load
100: non-contact type power swivel 110: first coil part
120: second coil part 130: first case
140: second case 135, 145: through-hole
150: cover 170: bearing part

Claims (8)

A first coil part connected to a floating structure and rotatable together with the floating structure, the first coil part being wound and being supplied with a current from a power supply part arranged in the floating structure;
A current is induced by a magnetic field formed in the first coil part and a second coil is wound around the turntable and connected to a turret relatively rotating with the floating structure and spaced a predetermined distance from the first coil part, A second coil part for supplying to the turret side;
A height difference determining unit that detects whether a height difference between the first coil part and the second coil part is generated and the area where the first coil and the second coil face each other is reduced and calculates a height difference degree; And
A height difference which allows the area of the first coil and the second coil to be increased by raising or lowering the first coil part or the second coil part based on the height difference calculated by the height difference judging part And a compensation unit,
Wherein the height difference determination unit detects whether a height difference between the first coil part and the second coil part occurs through measuring a strength of a magnetic field around the second coil part along a height direction of the second coil part, The non-contact power swivel compensates for the difference in height to calculate the height difference. The method according to claim 1,
A tilting judging unit for detecting whether the first coil part and the second coil part are inclined or not and calculating a tilting degree; And
And a driving unit that tilts the first coil unit or the second coil unit based on a tilting sensed by the tilting determination unit. delete The method according to claim 1,
And the second coil portion includes:
Pillars;
An upper plate disposed at an upper portion of the column portion; And
And a lower plate disposed below the column portion,
Wherein the height difference judging unit compensates for a height difference including a plurality of magnetic field measuring devices respectively disposed on the upper surface of the upper plate, the lower surface of the upper plate, the upper surface of the lower plate, and the lower surface of the lower plate. 5. The method of claim 4,
The height difference judging unit compares the intensities of the magnetic fields measured on the upper surface and the lower surface of the upper plate with each other and compares the intensities of the magnetic fields measured respectively on the upper and lower surfaces of the lower plate, A non-contact power swivel compensating for a height difference that senses whether a height difference has occurred. 6. The method of claim 5,
Wherein the height difference determination unit determines that the difference in intensity of the magnetic field measured on the upper surface and the lower surface of the upper plate exceeds a preset value and the difference in intensity of the magnetic field measured on the upper surface and the lower surface of the lower plate exceeds a predetermined value The height difference for determining that a height difference has occurred between the first coil part and the second coil part is compensated. The method according to claim 6,
The magnetic field measured on the upper surface of the upper plate is larger than the magnetic field measured on the lower surface of the upper plate when the height difference determining unit determines that a height difference is generated between the first coil unit and the second coil unit, Wherein the height difference compensating unit descends the first coil part and the magnetic field measured on the upper surface of the upper plate is smaller than the magnetic field measured on the lower surface of the upper plate and the height of the lower plate is smaller than the magnetic field measured on the lower surface of the lower plate, Wherein when the magnetic field measured on the upper surface is smaller than the magnetic field measured on the lower surface of the lower plate, the height difference compensating unit compensates for the height difference for raising the first coil part. The method according to claim 1,
Wherein the height difference compensating unit compensates for a height difference including an actuator that is disposed below the first coil part and moves forward and backward to thereby raise or lower the first coil part.

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