Flexible cable for tidal power generation

Abstract

The invention belongs to the field of cables, and particularly relates to a tidal power generation flexible cable. The cable comprises a sheath layer, a core cavity, a core sleeve and a core wire. The core cavity is arranged in the middle of the sheath layer, the core cavity is in the shape of a rounded regular hexagon with the wall portion protruding inwards in an arc shape on the radial section of the cable, and the corner portion and the wall portion of the core cavity are in an arc shape and are respectively an outer arc corner and an outer arc wall. The shape of the core sleeve on the radial cross section of the cable is the same as that of the core cavity, is reduced in an equal ratio, and is also in a rounded-corner-like regular hexagon shape, the corner part is an inner arc angle, and the wall part is an inner arc wall; and a tide buffer bracket is arranged between the core cavity and the core sleeve. On the basis of keeping the flexibility of the cable, a movable elastic buffer structure is constructed and formed in the cable, so that the cable can be prevented from being damaged by periodic tide acting force, and meanwhile, the flexibility and the relatively low specific gravity of the cable are kept.

Description

Technical Field

[0001] The invention belongs to the field of cables, and in particular relates to a tidal power generation soft cable. Background Art

[0002] Tidal power generation cable is a type of cable, which is a special cable used exclusively for tidal power generation equipment.

[0003] At present, tidal power generation cables usually need to be used in conjunction with protective facilities, such as pipeline protection, in which the tidal power generation cables are contained and installed in the pipeline to avoid the forces generated by the tidal action causing cable distortion and aging damage.

[0004] However, the pipeline installation process is cumbersome and costly, so the cable structure is currently being improved to adapt to the periodic force of tides. Common compression-resistant optical cables are prone to cable damage when facing periodic strong external forces, and some armored reinforced tidal power generation cables have poor flexibility and are difficult to reel and store. They are also heavy and have high transportation costs.

[0005] Therefore, it is of great significance to develop a tidal power generation cable with flexibility and low specific gravity. Summary of the invention

[0006] In order to solve the problems that existing cables are easily twisted, burst or damaged after being affected by tidal forces, and the actual external force resistance effect is poor, and some cables with tidal resistance have high cable hardness, low flexibility and high specific gravity, the present invention provides a tidal power generation soft cable.

[0007] The main purpose of the present invention is: 1. Ensure that the cable is not easily damaged when used in tidal power generation equipment; 2. Keep the cable flexible to facilitate reel storage; 3. Avoid using too much metal armor structure which will lead to an increase in specific gravity.

[0008] To achieve the above objectives, the present invention adopts the following technical solutions.

[0009] A tidal power generation flexible cable, comprising: Sheath layer, core cavity, core casing and core wire; The core cavity is arranged in the middle of the sheath layer, and in the radial cross section of the cable, the core cavity is a regular hexagon with rounded corners and an arc-shaped wall that bulges inwards, and its corners and walls are both arc-shaped, which are outer arc corners and outer arc walls respectively; The shape of the core sleeve on the radial cross section of the cable is the same as that of the core cavity, which is proportionally reduced and is also a regular hexagon with rounded corners, with inner arc corners and inner arc walls; A tidal buffer bracket is provided between the core cavity and the core sleeve.

[0010] As a preference, The tidal buffer support is composed of a plurality of S-shaped support monomers, and any two adjacent S-shaped support monomers can form an Ω-shaped support unit.

[0011] As a preference, The tidal buffer bracket abuts against the outer arc corner of the core cavity and the inner arc wall of the core sleeve alternately.

[0012] As a preference, An elastic hose is arranged between the tidal buffer support and the inner wall of the core cavity and the outer wall of the core sleeve.

[0013] As a preference, The elastic hose is arranged between the tidal buffer support and the inner arc corner and between the tidal buffer support and the outer arc wall.

[0014] As a preference, The core cavity in the sheath layer is also provided with twisted wire holes evenly distributed circumferentially on the outer side thereof; A tensile reinforcement member is provided in the stranded wire hole. As a preference, The tensile reinforcement is made of twisted steel or aluminum wire.

[0015] As a preference, The core wire is a conductive wire covered with an insulating layer and is arranged in a core sleeve.

[0016] The beneficial effects of the present invention are: The present invention forms a movable elastic buffer structure inside the cable while maintaining its flexibility, which can prevent the cable from being damaged by periodic tidal forces, while maintaining the flexibility and relatively low specific gravity of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the cable of the present invention; Figure 2 It is a schematic diagram of the deformation of the internal tidal buffer support structure of the cable of the present invention after being subjected to tidal force; In the figure: 100 sheath layer, 101 core cavity, 1011 outer arc angle, 1012 outer arc wall, 102 stranded wire hole, 200 tidal buffer bracket, 201 bracket monomer, 202 elastic hose, 300 core casing, 301 inner arc angle, 302 inner arc wall, 303 damping layer, 400 core wire, 500 tensile reinforcement. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with specific embodiments and the accompanying drawings. A person of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative work should fall within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined, and "several" means one or more.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all methods known to those skilled in the art.

[0022] Example A kind of Figure 1 The tidal power generation flexible cable shown specifically comprises: Sheath layer 100, core cavity 101, core sleeve 300 and core wire 400; The core cavity 101 is arranged in the middle of the sheath layer 100. On the radial cross section of the cable, the core cavity 101 is a regular hexagon with rounded corners and the wall portion is arc-shaped and convex inwardly. The corners and the wall portion are both arc-shaped, which are the outer arc corner 1011 and the outer arc wall 1012 respectively. The arc-shaped convex direction of the corner portion is radially outward, and the convex direction of the wall portion is radially inward, so that the inner wall of the core cavity 101 as a whole presents a complete wave shape on the radial cross section of the cable. The shape of the core sleeve 300 on the radial cross section of the cable is the same as that of the core cavity 101, which is proportionally reduced and is also a regular hexagon with rounded corners. Its corner is the inner arc corner 301, which is correspondingly arranged on the inner side of the outer arc corner 1011, is in an arc shape and protrudes radially outward. Its wall is the inner arc wall 302, which is correspondingly arranged on the radial inner side of the outer arc wall 1012, is in an arc shape and protrudes radially inward. Similarly, the outer wall of the whole core sleeve 300 presents a complete wave shape on the radial cross section of the cable. The core wire 400 is a conductive wire covered with an insulating layer, which is arranged in the core sleeve 300; A tidal buffer support 200 is provided between the core cavity 101 and the core sleeve 300; The tidal buffer support 200 is composed of a plurality of S-shaped support monomers 201, and any two adjacent S-shaped support monomers 201 can form a support unit similar to an Ω-shaped structure, thereby forming a complete wavy structure similar to the inner wall of the core cavity 101 and the outer wall of the core sleeve 300; The tidal buffer bracket 200 abuts against the outer arc corner 1011 of the core cavity 101 and the inner arc wall 302 of the core sleeve 300 alternately; An elastic rubber hose 202 is provided between the tidal buffer support 200 and the inner wall of the core cavity 101 and the outer wall of the core sleeve 300; The elastic hose 202 is disposed between the tidal buffer support 200 and the inner arc corner 301 and between the tidal buffer support 200 and the outer arc wall 1012 .

[0023] Through the coordination of the above structure, the cable of the present invention can maintain good softness and good vibration resistance and buffering ability. Specifically, when the cable is used in tidal power generation equipment, it is usually susceptible to the periodic impact of the tide and the ebb and flow of the tide on the cable, causing the cable to form a relatively regular periodic vibration. In this regard, the existing treatment methods mostly use tools such as buoys to make part of the cable float on the water surface, so as to reduce the underwater laying length of the cable and reduce the underwater impact on the entire cable. However, this method still cannot avoid that part of the cable still needs to be connected from the equipment to the water surface, and this part of the cable is more likely to be damaged due to impact, vibration, torsion, etc. The cable of the present invention realizes deformation buffering by using the tidal buffer bracket 200 structure with the characteristic of variable internal structure. For example, when the cable is subjected to external force, the outer sheath pushes inward through the outer arc angle 1011 of the core cavity 101 and squeezes the bracket monomer 201. Figure 1 The configuration feature of the bracket monomer 201 shown is that a portion of the bracket monomer 201 is actually attached to the outer surface of the inner arc corner 301 of the core sleeve 300. Figure 2As shown, after the outer end is subjected to the external force in direction a, the inner arc angle 301 will be used as a fulcrum to form a lever movement, and the other end will produce movement and extrusion along the c direction. In this process, as the displacement deformation and extrusion process occur, the fulcrum will move along the b direction. At the same time, the elastic hose 202 matched at both ends of the bracket monomer 201 will also produce compression deformation. In the process of lever movement, it can be transformed into a structure with circumferential stiffness, and in this process, the force point is concentrated on the inner arc angle 301, and an extrusion force is formed along the d direction. The inner arc angle 301 is subjected to multi-directional forces to form a concentrated force, but it can also form a force offset. The concentrated force hardens it to form better mechanical properties, so that it can produce very good impact resistance. In addition, the above structure can form a buffer deformation with the periodic force to cope with the periodic force problem of the tidal power generation cable. In addition, after the external force that causes the deformation of the tidal buffer bracket 200 disappears, the elastic hose 202 can promote the rapid resetting of the buffer unit. At the same time, the present invention adopts a non-integrated bracket monomer 201 to form the tidal buffer bracket 200. This is because the cable is frequently subjected to external forces and the force of the tide on the cable is relatively fixed in a short period of time. Therefore, if an integrated tidal buffer bracket 200 with the same structure is used, it is easy to cause itself to produce serious deformation and quickly age and fail, and it is impossible to concentrate the force on the inner arc angle 301 of the core sleeve 300 through the lever principle, which easily causes the internal cable to be stressed. Therefore, it is very critical that the present invention adopts a split structure tidal buffer bracket 200.

[0024] Furthermore, The outer wall surface of the core sleeve 300 is also coated with a damping coating to form a damping layer 303, which can further enhance the leverage effect to prevent the bracket monomer 201 from deflecting or shifting after being stressed. The core cavity 101 in the sheath layer 100 is also provided with stranded wire holes 102 evenly distributed circumferentially on the outer side thereof; The stranded wire hole 102 is provided with a tensile reinforcement 500, which is a stranded wire made of steel wire or aluminum wire, and can further improve the tensile strength of the cable to prevent the cable from being broken and damaged when subjected to excessive external force.

Claims

1. A tidal power generation flexible cable, characterized in that: include: Sheath layer, core cavity, core casing and core wire; The core cavity is arranged in the middle of the sheath layer, and in the radial cross section of the cable, the core cavity is a regular hexagon with rounded corners and an arc-shaped wall that bulges inwards, and its corners and walls are both arc-shaped, which are outer arc corners and outer arc walls respectively; The shape of the core sleeve on the radial cross section of the cable is the same as that of the core cavity, which is proportionally reduced and is also a regular hexagon with rounded corners, with inner arc corners and inner arc walls; A tidal buffer bracket is provided between the core cavity and the core sleeve.

2. A tidal power generation flexible cable according to claim 1, characterized in that: The tidal buffer support is composed of a plurality of S-shaped support monomers, and any two adjacent S-shaped support monomers can form an Ω-shaped support unit.

3. A tidal power generation flexible cable according to claim 1 or 2, characterized in that: The tidal buffer bracket abuts against the outer arc corner of the core cavity and the inner arc wall of the core sleeve alternately.

4. A tidal power generation flexible cable according to claim 1, characterized in that: An elastic hose is arranged between the tidal buffer support and the inner wall of the core cavity and the outer wall of the core sleeve.

5. A tidal power generation flexible cable according to claim 4, characterized in that: The elastic hose is arranged between the tidal buffer support and the inner arc corner and between the tidal buffer support and the outer arc wall.

6. A tidal power generation flexible cable according to claim 1, characterized in that: The core cavity in the sheath layer is also provided with twisted wire holes evenly distributed circumferentially on the outer side thereof; A tensile reinforcement piece is inserted into the stranded wire hole.

7. A tidal power generation flexible cable according to claim 6, characterized in that: The tensile reinforcement is made of twisted steel or aluminum wire.

8. A tidal power generation flexible cable according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that: The core wire is a conductive wire covered with an insulating layer and is arranged in a core sleeve.

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