Cable for offshore wind power

Abstract

A cable for offshore wind power. The cable comprises a cable body (1). A spiral sheath (2) is wound around the outer surface of the cable body (1), and the spiral sheath (2) comprises a plastic spiral strip (21) and a wax-based spiral strip (22). The spiral winding pitch of the plastic spiral strip (21) is the same as the spiral winding pitch of the wax-based spiral strip (22). The wax-based spiral strip (22) is located inside of the plastic spiral strip (21), and every two adjacent spiral units of the plastic spiral strip (21) are in lap joint with the same spiral unit of the wax-based spiral strip (22). The wax-based spiral strip (22) of the spiral sheath (2) has wax attached to the outer surface of the cable body, and the wax-based material is hydrophobic, can hinder seawater from reaching a surface of the cable body, and is beneficial to reducing the corrosive effect of seawater on the cable body.

Description

Cable for offshore wind power TECHNICAL FIELD

[0001] The present application relates to the field of cables, in particular to a cable for offshore wind power. BACKGROUND

[0002] Offshore wind power is a key field of renewable energy development, and in recent years the scale of offshore wind power has increased significantly. Offshore wind power has the characteristics of abundant resources, high utilization hours of power generation, no land occupation and suitability for large-scale development, and is the latest frontier of global wind power development.

[0003] The electric energy of offshore wind power is transmitted outward through a cable, and the conductor inside the cable is protected by the protective materials of the insulating layer, the armor and the copper shielding layer, and is insulated from the external environment. However, the laying of the cable of offshore wind power usually needs to pass through seawater, and the salt in seawater can easily cause corrosion to the outer material of the cable, accelerating the aging of the cable and thus affecting the service life of the cable. Although the corrosion of seawater to the surface of the cable can be reduced by coating a water-resistant material on the surface of the cable, there is a certain contact gap between the water-resistant material and the cable, allowing seawater to corrode the insulating material of the cable through the contact gap between the water-resistant material and the cable, so the protection of the cable for offshore wind power needs to be strengthened.

[0004] SUMMARY

[0005] In order to reduce the corrosion of seawater to the cable for offshore wind power, the present application provides a cable for offshore wind power.

[0006] The cable for offshore wind power provided by the present application adopts the following technical scheme:

[0007] A cable for offshore wind power, comprising a cable body, a spiral sheath is wound on the outer surface of the cable body, the spiral sheath comprises a plastic spiral belt and a waxy spiral belt, the spiral winding spacing of the plastic spiral belt and the waxy spiral belt is the same, the waxy spiral belt is located on the inner side of the plastic spiral belt, and adjacent two spiral units of the plastic spiral belt are overlapped on the same spiral unit of the waxy spiral belt.

[0008] By adopting the technical scheme, the spiral sheath is wound on the outer surface of the cable body, so that the cable body is protected. Compared with conventional water-proof protection measures, the wax spiral belt of the spiral sheath can have wax attached to the outer surface of the cable body. The wax material has hydrophobicity, which can prevent seawater from touching the surface of the cable body, thereby reducing the corrosion of seawater on the cable body. The plastic spiral belt covers the wax spiral belt, so that the wax spiral belt is kept between the plastic spiral belt and the outer surface of the cable body, and the loss of the wax material of the wax spiral belt is reduced. When the insulating material of the outer layer of the cable body has a crack, the wax of the wax spiral belt can enter the crack of the insulating material, so as to reduce the erosion of seawater on the crack of the insulating material, and help to delay the spread of the crack of the insulating material. The wax spiral belt and the plastic spiral belt are overlapped with each other, so that the wax spiral belt can seal the gap between adjacent spiral units of the plastic spiral belt.

[0009] Optionally, the wax spiral belt comprises a woven belt base and a wax coating layer, and the wax coating layer covers the woven belt base.

[0010] By adopting the technical scheme, the material of the wax coating layer is wax, which can play a main hydrophobic role. The woven belt base serves as a carrier for carrying the wax coating layer, so that the wax material can be conveniently coated on the outer surface of the cable body. The woven belt base has many gaps as a woven fabric, which can better accommodate and retain the wax material, thereby reducing the loss of the wax material.

[0011] Optionally, the inner side surface of the plastic spiral belt comprises two inclined surfaces, the two inclined surfaces are oppositely inclined with respect to the outer side surface of the plastic spiral belt, the two inclined surfaces have the same inclination direction, and the two inclined surfaces are arranged side by side along the width direction of the plastic spiral belt.

[0012] By adopting the technical scheme, the plastic spiral belt abuts against the wax spiral belt through the two inclined surfaces. When the plastic spiral belt is spirally tightened, the inclined surfaces of the plastic spiral belt and the surface of the wax spiral belt form a force in the length direction of the cable body. Since the two inclined surfaces have the same inclination, the directions of the forces in the length direction of the cable body generated when the two sides of the plastic spiral belt overlap the wax spiral belt are the same. The force in the length direction of the cable body formed between the plastic spiral belt and the wax spiral belt can make each spiral unit of the plastic spiral belt have a moving trend in the same direction, which is conducive to the combination and tightening of each spiral unit of the plastic spiral belt.

[0013] Optionally, the width of the wax spiral belt is smaller than the width of the plastic spiral belt, and a gap allowance is left between adjacent two spiral units of the wax spiral belt. A silica gel damping strip is arranged between the inner surface of the plastic spiral belt and the outer surface of the cable body, and the silica gel damping strip is located in the gap between the adjacent two spiral units of the wax spiral belt.

[0014] By adopting the technical scheme, the silicone damping strip is arranged between the inner surface of the plastic spiral belt and the outer surface of the cable body, so that the frictional damping between the plastic spiral belt and the cable body is increased, and the state of the plastic spiral belt wound on the cable body is more stable.

[0015] Optionally, a step surface is formed between the two inclined surfaces, and the silicone damping strip abuts against the step surface.

[0016] By adopting the technical scheme, the step surface can limit the relative position between the silicone damping strip and the plastic spiral belt in the width direction, and the silicone damping strip can limit the relative position between the wax spiral belt and the plastic spiral belt in the width direction, so as to control the size of the mutual lap between the wax spiral belt and the plastic spiral belt.

[0017] Optionally, the plastic spiral belt is provided with a spiral sealing caulking layer, and the spiral sealing caulking layer fills the spiral joint of the plastic spiral belt.

[0018] By adopting the technical scheme, the spiral sealing caulking layer can shield the spiral joint of the plastic spiral belt, so as to hinder seawater from entering the inside of the plastic spiral belt, and facilitate further protection of the wax spiral belt.

[0019] Optionally, a plurality of longitudinal grooves are arranged on the inner side of the plastic spiral belt in the width direction, and the longitudinal grooves are distributed along the entire length range of the inner side of the plastic spiral belt.

[0020] By adopting the technical scheme, the longitudinal grooves can increase the damping effect between the plastic spiral belt and the wax spiral belt, so as to strengthen the connection effect between the plastic spiral belt and the wax spiral belt, and reduce the relative sliding between the plastic spiral belt and the wax spiral belt.

[0021] Optionally, the two ends of the spiral sheath are respectively provided with a positioning sleeve, the positioning sleeve comprises two arc-shaped half-plates, the two arc-shaped half-plates are detachably connected, and the two arc-shaped half-plates jointly enclose the spiral sheath.

[0022] By adopting the technical scheme, the positioning sleeve can keep the relative position between the two ends of the spiral sheath and the cable body stable, so as to keep the installation state of the spiral sheath on the cable body stable. The positioning sleeve is composed of two arc-shaped half-plates, so that the positioning sleeve does not need to be installed by sleeving the cable body, and the installation of the positioning sleeve is more convenient and fast.

[0023] Optionally, the inner circumferential surface of the positioning sleeve abuts against the outer surface of the cable body, one end of the positioning sleeve close to the spiral sheath is provided with a counterbore, and the counterbore is used for avoiding the end portion of the spiral sheath.

[0024] By adopting the technical scheme, the inner circumferential surface of the positioning sleeve abuts against the outer surface of the cable body, frictional damping is formed between the positioning sleeve and the cable body, the position of the positioning sleeve on the cable body is kept stable. The counterbore at the end of the positioning sleeve can position the end of the spiral sheath, so that the position of the spiral sheath on the cable body is kept stable.

[0025] Optionally, the positioning sleeve is provided with a clamp spring groove, and the positioning sleeve is clamped with a clamp spring through the clamp spring groove.

[0026] By adopting the technical scheme, the two arc-shaped half-plates of the positioning sleeve are connected by the clamp spring, so that the connection between the two arc-shaped half-plates is more convenient.

[0027] [Corrected according to Rule 91 on 09.09.2024] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] [Corrected according to Rule 91 on 09.09.2024] 1. The wax spiral band of the spiral sheath covers the outer surface of the cable body, which can prevent seawater from touching the surface of the cable body, and is beneficial to reduce the corrosion of seawater on the cable body. The plastic spiral band covers the wax spiral band, so that the wax spiral band is kept between the plastic spiral band and the outer surface of the cable body. When the insulating material of the outer layer of the cable body cracks, the wax of the wax spiral band can enter the cracks of the insulating material, which helps to delay the spread of the cracks of the insulating material.

[0029] [Corrected according to Rule 91 on 09.09.2024] 2. By arranging the silica gel damping strip between the inner surface of the plastic spiral band and the outer surface of the cable body, the frictional damping between the plastic spiral band and the cable body can be increased, so that the state of the plastic spiral band wound on the cable body is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0030] [Corrected according to Rule 91 on 09.09.2024] FIG. 1 is a schematic view of the connection relationship between the spiral sheath and the cable body according to embodiment 1.

[0031] [Corrected according to Rule 91 on 09.09.2024] FIG. 2 is a partial enlarged view of A in FIG. 1.

[0032] [Corrected according to Rule 91 on 09.09.2024] FIG. 3 is a sectional view of B-B in FIG. 1 for embodying the structure of the positioning sleeve.

[0033] [Corrected according to Rule 91 on 09.09.2024] FIG. 4 is a sectional view of the structure of the positioning sleeve according to embodiment 2.

[0034] [Corrected according to Rule 91 on 09.09.2024] Mark explanation: [0034.1][Amended according to Rule 91 on 09.09.2024]1, cable body; 2, spiral sheath; 21, plastic spiral belt; 211, bevel; 212, stepped surface; 213, longitudinal groove; 214, rounded corner; 22, wax spiral belt; 23, spiral sealing gap layer; 3, silica gel damping strip; 4, positioning sleeve; 41, arc-shaped half plate; 42, counterbore; 43, snap spring; 44, snap spring groove; 45, extended edge; 46, bolt and nut assembly; 47, through hole. DETAILED DESCRIPTION

[0035] [Amended according to Rule 91 on 09.09.2024] The present application is further described in detail below in combination with Figures 1-4.

[0036] [Amended according to Rule 91 on 09.09.2024] Embodiment 1

[0037] The embodiment of the present application discloses a cable for offshore wind power. Referring to Figure 1, the cable for offshore wind power comprises a cable body 1, a spiral sheath 2 is arranged on the outer surface of the cable body 1, the spiral sheath 2 comprises a plastic spiral belt 21 and a wax spiral belt 22, the spiral winding spacing of the plastic spiral belt 21 and the wax spiral belt 22 is the same, the wax spiral belt 22 is located on the inner side of the plastic spiral belt 21, and the adjacent two spiral units of the plastic spiral belt 21 are overlapped on the same spiral unit of the wax spiral belt 22. The two ends of the spiral sheath 2 are respectively provided with positioning sleeves 4, and the positioning sleeves 4 are used for positioning the end portions of the spiral sheath 2.

[0038] The spiral sheath 2 is wound and covered on the outer surface of the cable body 1, the wax spiral belt 22 has a hydrophobic effect, can reduce the contact of seawater with the outer surface of the cable body 1, thereby reducing the corrosion effect of seawater on the cable body 1, and the plastic spiral belt 21 can keep the wax spiral belt 22 between the plastic spiral belt 21 and the outer surface of the cable body 1, and reduce the loss of wax material.

[0039] The wax spiral belt 22 comprises a woven belt base body and a wax coating layer, the woven belt base body is coated with the wax coating layer, the material of the wax coating layer can use mineral wax or synthetic wax and the like wax material with a relatively high melting point, and the yarn material of the woven belt base body can use chemical fiber yarn or asbestos yarn.

[0040] Referring to FIG. 1 and FIG. 2, the inner side of the plastic spiral belt 21 comprises two inclined surfaces 211, which are oppositely inclined with the outer side of the plastic spiral belt 21, have the same inclination direction, are arranged side by side along the width direction of the plastic spiral belt 21, and form a step surface 212 between the two inclined surfaces 211. The plastic spiral belt 21 abuts against the wax spiral belt 22 through the inclined surfaces 211. When the plastic spiral belt 21 is spirally tightened, a force along the length direction of the cable body 1 is formed between the plastic spiral belt 21 and the wax spiral belt 22, so that the spiral units of the plastic spiral belt 21 can be combined and tightened.

[0041] Referring to FIG. 2, the width of the wax spiral belt 22 is smaller than that of the plastic spiral belt 21, and a gap allowance is left between the adjacent two spiral units of the wax spiral belt 22; a silica gel damping strip 3 is arranged between the inner surface of the plastic spiral belt 21 and the outer surface of the cable body 1, is located in the gap between the adjacent two spiral units of the wax spiral belt 22, and abuts against the step surface 212 between the two inclined surfaces 211.

[0042] The silica gel damping strip 3 can increase the friction damping between the plastic spiral belt 21 and the cable body 1, so that the position of the plastic spiral belt 21 on the cable body 1 is kept stable, and thus the position of the spiral sheath 2 on the cable body 1 is kept stable.

[0043] In order to increase the connection effect between the plastic spiral belt 21 and the wax spiral belt 22, a plurality of longitudinal grooves 213 are arranged on the inner side of the plastic spiral belt 21, are spaced apart along the width direction of the plastic spiral belt 21, and are distributed along the full length of the inner side of the plastic spiral belt 21. The longitudinal grooves 213 can increase the damping effect between the plastic spiral belt 21 and the wax spiral belt 22, and reduce the relative sliding between the plastic spiral belt 21 and the wax spiral belt 22.

[0044] Referring to FIG. 2, the plastic spiral belt 21 is provided with a spiral sealing and filling layer 23, which fills the spiral joints of the plastic spiral belt 21. The spiral sealing and filling layer 23 can prevent seawater from entering the inner side of the plastic spiral belt 21, and is beneficial to further protecting the wax spiral belt 22. The outer side of the plastic spiral belt 21 is provided with chamfered edges, and the spiral sealing and filling layer 23 is filled in the adjacent chamfered areas between the adjacent two spiral units of the plastic spiral belt 21. The spiral sealing and filling layer 23 is formed by filling sealing glue or hot melt glue, and the processing time of the spiral sealing and filling layer 23 is staggered and overlapped with the winding processing time of the spiral sheath 2, so as to improve the overall processing efficiency of the cable.

[0045] Referring to Figs. 2 and 3, the positioning sleeve 4 comprises two arc-shaped half-plates 41 which are detachably connected together and jointly enclose the spiral sheath 2. The outer periphery of the positioning sleeve 4 is provided with two snap spring grooves 44, and the positioning sleeve 4 is clamped with two shaft snap springs 43 through the snap spring grooves 44. The two shaft snap springs 43 jointly tightly hold the positioning sleeve 4, so that the two arc-shaped half-plates 41 are kept in the state of being spliced with each other. The end of the positioning sleeve 4 close to the spiral sheath 2 is provided with a counterbore 42 which is used for avoiding the end of the spiral sheath 2. The inner periphery of the positioning sleeve 4 is provided with a rubber damping layer which is used for abutting against the cable body 1 and the spiral sheath 2. The positioning sleeve 4 can position the end of the spiral sheath 2, so that the position of the spiral sheath 2 on the cable body 1 is kept stable.

[0046] The positioning sleeve 4 is spliced by the two arc-shaped half-plates 41, so that the positioning sleeve 4 does not need to be installed from the end of the cable body 1, and the installation of the positioning sleeve 4 is more convenient. The two arc-shaped half-plates 41 of the positioning sleeve 4 are connected by the snap springs 43, and the connection is more convenient. In other embodiments, the two arc-shaped half-plates 41 can also be connected by ropes or straps, or locked by bolt assemblies.

[0047] In the embodiment of the present application, the implementation principle of the cable for offshore wind power is that the cable body 1 of the offshore wind power cable is wound with the spiral sheath 2. The wax spiral band 22 of the spiral sheath 2 covers the outer surface of the cable body 1, and the wax will adhere to the outer surface of the cable body 1. The wax material has hydrophobicity, which can prevent seawater from touching the surface of the cable body 1, and is beneficial to reducing the corrosion of seawater on the cable body 1. When the insulating material of the outer layer of the cable body 1 appears cracks, the wax of the wax spiral band 22 can enter the cracks of the insulating material, which helps to delay the spread of the cracks of the insulating material. The plastic spiral band 21 covers the wax spiral band 22, so that the wax spiral band 22 is kept between the plastic spiral band 21 and the outer surface of the cable body 1, and the loss of the wax material of the wax spiral band 22 is reduced.

[0048] Embodiment 2

[0049] The difference between the present embodiment and embodiment 1 is that the connection structure between the two arc-shaped half-plates 41 of the positioning sleeve 4 is different from that of embodiment 1.

[0050] Referring to Fig. 4, the edge of the two straight edges of the arc-shaped half-plate 41 in the present embodiment extends outwardly to form an extension edge 45. The adjacent extension edges 45 of the two arc-shaped half-plates 41 are connected by a bolt and nut assembly 46. The extension edge 45 is provided with a bolt hole for the bolt and nut assembly 46. The material of the bolt and nut assembly 46 can be stainless steel, plastic or carbon fiber, etc.

[0051] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A cable for offshore wind power, characterized in that The cable body (1) is provided with a spiral sheath (2) on the outer surface, the spiral sheath (2) comprises a plastic spiral belt (21) and a wax spiral belt (22), the spiral winding interval of the plastic spiral belt (21) is the same as that of the wax spiral belt (22), the wax spiral belt (22) is located on the inner side of the plastic spiral belt (21), and the adjacent two spiral units of the plastic spiral belt (21) are overlapped on the same spiral unit of the wax spiral belt (22).

2. A cable for offshore wind power according to claim 1, characterized in that: The wax spiral belt (22) comprises a woven belt base body and a wax coating layer, and the wax coating layer covers the woven belt base body.

3. A cable for offshore wind power according to claim 1, characterized in that: The inner side surface of the plastic spiral belt (21) comprises two inclined surfaces (211), the two inclined surfaces (211) are oppositely inclined to the outer side surface of the plastic spiral belt (21), the inclined directions of the two inclined surfaces (211) are the same, and the two inclined surfaces (211) are arranged side by side along the width direction of the plastic spiral belt (21).

4. A cable for offshore wind power according to claim 3, characterized in that: The width of the wax spiral belt (22) is smaller than that of the plastic spiral belt (21), and a gap allowance is left between the adjacent two spiral units of the wax spiral belt (22); a silica gel damping strip (3) is arranged between the inner surface of the plastic spiral belt (21) and the outer surface of the cable body (1), and the silica gel damping strip (3) is located in the gap between the adjacent two spiral units of the wax spiral belt (22).

5. A cable for offshore wind power according to claim 4, characterized in that: A step surface (212) is formed between the two inclined surfaces (211), and the silica gel damping strip (3) abuts against the step surface (212).

6. A cable for offshore wind power according to claim 1, characterized in that: The plastic spiral belt (21) is provided with a spiral sealing and filling layer (23), and the spiral sealing and filling layer (23) fills the spiral joints of the plastic spiral belt (21).

7. The cable according to claim 1, characterized in that: The inner side surface of the plastic spiral belt (21) is provided with a plurality of longitudinal grooves (213) along the width direction, and the longitudinal grooves (213) are distributed along the full length of the inner side surface of the plastic spiral belt (21).

8. The cable according to claim 1, characterized in that: Both ends of the spiral sheath (2) are respectively provided with a positioning sleeve (4), the positioning sleeve (4) comprises two arc-shaped half-plates (41), the two arc-shaped half-plates (41) are detachably connected, and the two arc-shaped half-plates (41) jointly enclose the spiral sheath (2).

9. A cable for offshore wind power according to claim 8, characterized in that: The inner circumferential surface of the positioning sleeve (4) abuts against the outer surface of the cable body (1), one end of the positioning sleeve (4) close to the spiral sheath (2) is provided with a counterbore (42), and the counterbore (42) is used for avoiding the end portion of the spiral sheath (2).

10. A cable for offshore wind power according to claim 9, characterized in that: The positioning sleeve (4) is provided with a snap spring groove (44), and the positioning sleeve (4) is provided with a snap spring (43) through the snap spring groove (44).

Images