A zero-gravity submarine cable suitable for wave energy generation devices

Abstract

The invention provides a zero-gravity submarine cable suitable for a wave energy power generation device, comprising a cable protective layer, a core wire, a buoyancy bag, a damage detection mechanism and a main console. The damage detection mechanism comprises a first metal contact, a second metal contact, an electromagnet and a metal rod. After the buoyancy bag is arranged on the outer surface of the cable protective layer, the cable can float in the seawater under the buoyancy of the buoyancy bag to prevent it from sinking to the seabed and being damaged by friction with seabed sand and gravel. When one of the buoyancy bags is damaged, seawater enters the buoyancy bag to establish an electrical connection between the first metal contact and the second metal contact. The electromagnet becomes magnetic after obtaining the electric energy transmitted by the core wire and attracts the metal rod to move. During the movement of the metal rod, a trigger button is triggered, and the trigger button sends an electrical signal to the main console, so that the main console can locate the position of the damaged buoyancy bag according to the received electrical signal, which is convenient for staff to perform repair and maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of cables, and in particular to a zero-gravity submarine cable suitable for a wave energy power generation device. Background Art

[0002] Submarine power cables play an increasingly important role in offshore power energy transmission and have been widely used in island power supply, independent grid connection, offshore wind farm power output, offshore oil platform power supply, and power transmission across rivers and straits. After the submarine cable is laid, it is placed on the seabed surface in long-term contact with seabed sand and gravel. Affected by ocean currents and long-term friction with seabed sand and gravel, it may cause large-scale and long-distance corrosion and wear of the submarine cable armor and sheath, and cracks or perforations. Compared with land cables, submarine power cable routes are often tens of kilometers or even longer. Once damaged, a variety of means are required to find the specific location of the fault point underwater and implement salvage and repair. The maintenance cycle is very long, which may affect the needs of users in the power supply area. In severe cases, the waterway needs to be closed, causing larger economic losses and social impacts. Summary of the invention

[0003] In view of this, the present invention proposes a zero-gravity submarine cable suitable for a wave energy power generation device, which can realize the floating of the cable in the sea and prevent the outer layer of the cable from being damaged by friction with seabed sand and gravel. At the same time, it can also locate the position of the damaged buoyancy bag to facilitate maintenance.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A zero-gravity submarine cable suitable for a wave energy power generation device comprises a cable protective layer, a core wire, a buoyancy capsule, a damage detection mechanism and a main console arranged on one side of the power generation device, wherein the cable protective layer is coated on the outside of the core wire, the buoyancy capsule is arranged on the outer surface of the cable protective layer, the damage detection mechanism is arranged on the cable protective layer and is electrically connected to the main console; the damage detection mechanism comprises a first metal contact, a second metal contact, an electromagnet and a metal rod, the first metal contact and the second metal contact are arranged on the outer surface of the cable protective layer where the buoyancy capsule is located, the first metal contact is electrically connected to the core wire, the second metal contact is electrically connected to the electromagnet and the core wire in sequence, the electromagnet is arranged on the inner wall of the cable protective layer, the metal rod is slidably arranged on the inner wall of the cable protective layer and is located on one side of the electromagnet, a trigger button is arranged on the inner wall of the cable protective layer between the metal rod and the electromagnet, and the trigger button is electrically connected to the main console through a signal connection line.

[0006] Preferably, a T-shaped groove is provided on the inner surface of the cable protective layer, a T-shaped slider is provided on the metal rod, the T-shaped slider is located in the T-shaped groove, and the trigger button is arranged in the T-shaped groove.

[0007] Preferably, it also includes a normally closed button, which is connected in series between the second metal contact and the electromagnet, and the normally closed button is arranged in a T-shaped slide groove, and the distance between the trigger button and the electromagnet is greater than the distance between the normally closed button and the electromagnet.

[0008] Preferably, the cable protective layer is elliptical, with the major axis of the cable protective layer along the direction of the coastal current and the minor axis along the direction of gravity.

[0009] Preferably, a display screen is provided on the main console.

[0010] Preferably, it also includes a float component, which is arranged on the outer surface of the cable protective layer.

[0011] Preferably, the floating assembly includes a buoy, a fuse, a battery pack, a waterproof box and a connecting rope. The waterproof box is arranged on the outer surface of the cable protective layer, the battery pack is arranged inside the waterproof box, one end of the connecting rope is connected to the buoy, and the other end is fixed to the outer surface of the cable protective layer. A fixing rope is arranged at the end of the connecting rope close to the buoy, and the fixing rope extends into the waterproof box and is connected to the fuse. The battery pack is electrically connected to the fuse and the first metal contact, respectively, and the second metal contact is electrically connected to the fuse; the length of the connecting rope is greater than the diving depth of the cable.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The invention provides a zero-gravity submarine cable suitable for a wave energy power generation device. By arranging a buoyancy bag on the outer surface of a cable protective layer, the cable can float in the sea under the buoyancy of the buoyancy bag after entering the sea, and will not sink to the seabed, thereby preventing the cable protective layer from being damaged by the friction of seabed sandpaper, and extending the service life of the cable. At the same time, the cable also has a damage detection function of the buoyancy bag. When one of the buoyancy bags is damaged by the impact of fish or the like, seawater will enter the buoyancy bag, and the seawater will be used as a conductive medium to establish an electrical connection between the first metal contact and the second metal contact, so that the electric energy transmitted on the core wire can be transmitted to the electromagnet, so that the electromagnet is energized and magnetized to attract the metal rod to slide, and the metal rod slides to trigger a trigger button, which sends an electrical signal to a main console, and the main console can locate the position of the damaged buoyancy bag according to the received electrical signal, so that repair and maintenance can be conveniently performed, and the damage of the buoyancy bag can be prevented, which will cause a section of the cable to sink to the seabed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a structural schematic diagram of a first embodiment of a zero-gravity submarine cable suitable for a wave-breaking energy power generation device according to the present invention;

[0016] Figure 2 It is a structural schematic diagram of a damage detection mechanism of a first embodiment of a zero-gravity submarine cable suitable for a wave-breaking energy power generation device according to the present invention;

[0017] Figure 3 A schematic diagram of a damage detection circuit of a first embodiment of a zero-gravity submarine cable suitable for a wave-breaking energy power generation device according to the present invention;

[0018] Figure 4 It is a structural schematic diagram of a second embodiment of a zero-gravity submarine cable suitable for a wave-breaking energy power generation device according to the present invention;

[0019] Figure 5 It is a schematic diagram of a buoy release circuit of a second embodiment of a zero-gravity submarine cable suitable for a wave-breaking energy power generation device of the present invention;

[0020] In the figure, 1 is the cable protective layer, 2 is the core wire, 3 is the buoyancy bag, 4 is the main console, 5 is the first metal contact, 6 is the second metal contact, 7 is the electromagnet, 8 is the metal rod, 9 is the trigger button, 10 is the T-shaped slide groove, 11 is the T-shaped slider, 12 is the normally closed button, 13 is the display screen, 14 is the buoy, 15 is the fuse, 16 is the battery pack, 17 is the waterproof box, 18 is the connecting rope, 19 is the fixing rope, and 20 is the signal connecting line. DETAILED DESCRIPTION

[0021] In order to better understand the technical content of the present invention, a specific embodiment is provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0022] See also Figures 1 to 3The present invention provides a zero-gravity submarine cable suitable for a wave energy power generation device, comprising a cable protective layer 1, a core wire 2, a buoyancy capsule 3, a damage detection mechanism and a main console 4 arranged on one side of the power generation device, wherein the cable protective layer 1 is coated on the outside of the core wire 2, the buoyancy capsule 3 is arranged on the outer surface of the cable protective layer 1, the damage detection mechanism is arranged on the cable protective layer 1 and is electrically connected to the main console 4; the damage detection mechanism comprises a first metal contact 5, a second metal contact 6, an electromagnet 7 and a metal rod 8, the first metal contact 5 and the second metal contact 6 are arranged on the outer surface of the cable protective layer 1 where the buoyancy capsule 3 is located, the first metal contact 5 is electrically connected to the core wire 2, the second metal contact 6 is electrically connected to the electromagnet 7 and the core wire 2 in sequence, the electromagnet 7 is arranged on the inner wall of the cable protective layer 1, the metal rod 8 is slidably arranged on the inner wall of the cable protective layer 1 and is located on one side of the electromagnet 7, a trigger button 9 is arranged on the inner wall of the cable protective layer 1 between the metal rod 8 and the electromagnet 7, and the trigger button 9 is electrically connected to the main console 4 through a signal connection line 20.

[0023] A zero-gravity submarine cable suitable for a wave energy power generation device in this embodiment is provided with a plurality of buoyancy capsules 3 on the outer surface of the cable protective layer 1. Under the action of the buoyancy capsules 3, after the cable sinks to the seabed, it can float in the sea without sinking into the seabed, and can prevent the seabed sand and gravel from rubbing the cable protective layer 1 when the seawater flows, and prevent the cable protective layer 1 from being scratched, thereby extending the service life of the cable. In this embodiment, buoyancy capsules 3 are provided at intervals on the cable protective layer 1, and the buoyancy capsules 3 are arranged in a shape similar to a wing, so as to prevent the influence of the flow of seawater on the cable and the buoyancy capsules 3. The number of buoyancy capsules 3 at the same position can be determined according to the diving depth of the cable. After the cable enters the water, its gravity should be equal to the sum of the buoyancy of all the buoyancy capsules 3, so as to ensure that the cable is in a balanced state in the water and floats in the water after entering the water. At the same time, this embodiment also adds damage detection of the buoyancy capsules 3. When one of the buoyancy capsules 3 is damaged, the main console 4 can receive the damage information and accurately locate which buoyancy capsule 3 is damaged, so as to facilitate the staff to carry out repair and maintenance.

[0024] Under normal use, the interior of the buoyancy bag 3 is filled with gas, and the first metal contact 5 and the second metal contact 6 on the outer surface of the cable protective layer 1 located at the buoyancy bag 3 have no electrical connection. The circuit loop composed of the first metal contact 5, the electromagnet 7, the core wire 2 and the second metal contact 6 is disconnected at the first metal contact 5 and the second metal contact 6. The core wire 2 transmits the electric energy generated by the power generation device and can also be used as a power supply for the electromagnet 7. Under normal conditions, the electric energy transmitted by the core wire 2 cannot be transmitted to the electromagnet 7. The electromagnet 7 is not magnetic at this time, and the metal rod 8 located on one side of the electromagnet 7 is also in the initial away state. When the buoyancy bag 3 is damaged, seawater will enter the interior of the buoyancy bag 3 and contact the first metal contact The first metal contact 5 contacts with the second metal contact 6, and an electrical connection is established between the first metal contact 5 and the second metal contact 6 with seawater as the conductive medium, so that the electric energy transmitted on the core wire 2 can be transmitted to the electromagnet 7, so that the electromagnet 7 is energized and magnetized, and the electromagnet 7 will attract the metal rod 8 located on one side thereof to move toward the electromagnet 7, and the metal rod 8 triggers the trigger button 9 provided on the inner wall of the cable protective layer 1 during the sliding process, and the trigger button 9 generates an electrical signal and transmits it to the main console 4 through the signal connection line 20, and the main console 4 locates the damaged buoyancy bag 3 according to the received electrical signal, so that the staff can quickly repair and maintain the damaged buoyancy bag 3 to prevent the cable from sinking due to the damage of the buoyancy bag 3 at a certain place.

[0025] Preferably, a T-shaped groove 10 is provided on the inner surface of the cable protective layer 1 , a T-shaped slider 11 is provided on the metal rod 8 , the T-shaped slider 11 is located in the T-shaped groove 10 , and the trigger button 9 is arranged in the T-shaped groove 10 .

[0026] When the electromagnet 7 is energized and magnetically attracts the metal rod 8 to slide, the T-shaped slider 11 provided on the metal rod 8 can slide along the T-shaped groove 10 on the inner wall of the cable protective layer 1, and the trigger button 9 is provided in the T-shaped groove 10 and is located between the metal rod 8 and the electromagnet 7. When the metal rod 8 slides toward the electromagnet 7, the T-shaped slider 11 will trigger the trigger button 9, so that the trigger button 9 can send an electrical signal to the main console 4 on one side of the power generation device.

[0027] Preferably, it also includes a normally closed button 12, which is connected in series between the second metal contact 6 and the electromagnet 7, and the normally closed button 12 is arranged in a T-shaped slide groove 10, and the distance between the trigger button 9 and the electromagnet 7 is greater than the distance between the normally closed button 12 and the electromagnet 7.

[0028] Specifically, a normally closed button 12 is also provided in the T-shaped slide groove 10. The normally closed button 12 is provided close to the electromagnet 7. When the metal rod 8 is attracted and moved by the magnetic force of the electromagnet 7, the metal rod 8 triggers the trigger button 9 and the normally closed button 12 in turn. After the trigger button 9 sends an electrical signal to the main console 4, the normally closed button 12 is triggered and becomes open, thereby cutting off the circuit between the second metal contact 6 and the electromagnet 7, so that the circuit loop is cut off. At this time, the electric energy on the core wire 2 cannot be transmitted to the electromagnet 7, thereby preventing the loss of electric energy.

[0029] Preferably, the cable protective layer 1 is elliptical, with the major axis of the cable protective layer 1 along the direction of the coastal current and the minor axis along the direction of gravity.

[0030] The elliptical structural design allows seawater to flow through the cable smoothly without acting on the cable, reducing the displacement of the cable caused by the flow of seawater.

[0031] Preferably, a display screen 13 is provided on the main console 4 .

[0032] The main console 4 can display the damage information of the buoyancy bag 3 on line 13 of the display screen, so that the staff can understand the location information of the damaged buoyancy bag 3 .

[0033] Reference Figure 4 , Figure 5 As shown, it also includes a float component, which is arranged on the outer surface of the cable protective layer 1. The float component includes a buoy 14, a fuse 15, a battery pack 16, a waterproof box 17 and a connecting rope 18. The waterproof box 17 is arranged on the outer surface of the cable protective layer 1, and the battery pack 16 is arranged inside the waterproof box 17. One end of the connecting rope 18 is connected to the buoy 14, and the other end is fixed to the outer surface of the cable protective layer 1. A fixing rope 19 is arranged at one end of the connecting rope 18 close to the buoy 14, and the fixing rope 19 extends into the waterproof box 17 and is connected to the fuse 15. The battery pack 16 is electrically connected to the fuse 15 and the first metal contact 5 respectively, and the second metal contact 6 is electrically connected to the fuse 15; the length of the connecting rope 18 is greater than the diving depth of the cable.

[0034] This embodiment also adds a function of offshore positioning after the buoyancy bag 3 is damaged. Under normal conditions, the buoy 14 is connected to the outer surface of the cable protective layer 1 through the connecting rope 18, and the end of the connecting rope 18 is fixed by the fixing rope 19, so that the buoy 14 is located near the cable protective layer 1. When the cable enters the water, the buoy 14 enters the sea with the cable, and the other end of the fixing rope 19 extends into the waterproof box 17 and is connected to the fuse 15, and the fuse 15 and the battery pack 16 and the first metal contact 5 and the second metal contact 6 form a circuit loop. When the buoyancy bag 3 is used normally, the first metal contact 5 and the second metal contact 6 have no direct electrical connection relationship. When the buoyancy bag 3 is in normal use, the first metal contact 5 and the second metal contact 6 have no direct electrical connection relationship. After being damaged, the first metal contact 5 and the second metal contact 6 establish an electrical connection relationship with seawater as a conductive medium, so that the electric energy of the battery pack 16 can be transmitted to the fuse 15, and the fuse 15 converts the electric energy into heat energy and then melts, causing the fixed rope 19 to lose traction, and the buoy 14 moves upward and floats to the surface under the action of buoyancy. Therefore, when the staff is looking for the damaged buoyancy bag 3, they first locate the buoyancy bag 3 information according to the display screen 13 on the main console 4 and then move to the designated position, and determine the position of the damaged buoyancy bag 3 by the position of the buoy 14 on the sea surface. Even if the cable is displaced under the impact of seawater, the position of the damaged buoyancy bag 3 can be quickly found.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A zero-gravity submarine cable suitable for a wave energy power generation device, characterized in that: It includes a cable protective layer, a core wire, a buoyancy bag, a damage detection mechanism and a main console arranged on one side of the power generation device, the cable protective layer is coated on the outside of the core wire, the buoyancy bag is arranged on the outer surface of the cable protective layer, the damage detection mechanism is arranged on the cable protective layer and is electrically connected to the main console; the damage detection mechanism includes a first metal contact, a second metal contact, an electromagnet and a metal rod, the first metal contact and the second metal contact are arranged on the outer surface of the cable protective layer where the buoyancy bag is located, the first metal contact is electrically connected to the core wire, the second metal contact is electrically connected to the electromagnet and the core wire in sequence, the electromagnet is arranged on the inner wall of the cable protective layer, the metal rod is slidably arranged on the inner wall of the cable protective layer and is located on one side of the electromagnet, a trigger button is arranged on the inner wall of the cable protective layer between the metal rod and the electromagnet, the trigger button is electrically connected to the main console through a signal connection line, a T-shaped slide groove is arranged on the inner surface of the cable protective layer, and the metal rod A T-shaped slider is arranged on the top, and the T-shaped slider is located in the T-shaped slide groove. The trigger button is arranged in the T-shaped slide groove. It also includes a normally closed button, and the normally closed button is connected in series between the second metal contact and the electromagnet. The normally closed button is arranged in the T-shaped slide groove. The distance between the trigger button and the electromagnet is greater than the distance between the normally closed button and the electromagnet. It also includes a float assembly, and the float assembly is arranged on the outer surface of the cable protective layer. The float assembly includes a buoy, a fuse, a battery pack, a waterproof box and a connecting rope. The waterproof box is arranged on the outer surface of the cable protective layer, and the battery pack is arranged inside the waterproof box. One end of the connecting rope is connected to the buoy, and the other end is fixed to the outer surface of the cable protective layer. A fixing rope is arranged at the end of the connecting rope close to the buoy, and the fixing rope extends into the waterproof box and is connected to the fuse. The battery pack is electrically connected to the fuse and the first metal contact respectively, and the second metal contact is electrically connected to the fuse; the length of the connecting rope is greater than the diving depth of the cable.

2. A zero-gravity submarine cable suitable for a wave energy power generation device according to claim 1, characterized in that: The cable protective layer is elliptical in shape, with the major axis of the cable protective layer along the direction of the coastal current and the minor axis along the direction of gravity.

3. A zero-gravity submarine cable suitable for a wave energy power generation device according to claim 1, characterized in that: A display screen is arranged on the main console.

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