Wind power generation twist-resistant flexible cable

Abstract

The application relates to the technical field of power cables, and particularly discloses a wind power generation torsion-resistant flexible cable, which comprises a cable core and an inner sheath, a wrapping layer, a shielding layer and an outer sheath which are sequentially wrapped outside the cable core, the cable core comprises a central framework and a plurality of wires, and further comprises a positioning ball and a torsion-resistant element arranged along a central longitudinal axis, the torsion-resistant element is a hollow elastic member, is divided into a plurality of independent accommodating cavities along the central longitudinal axis direction, liquid is contained in the accommodating cavities, the torsion-resistant element is fixed between the inner wall surface of the inner sheath and the outer surface of the central framework, further comprises a buffer part with a cavity, the cavity in the buffer part is communicated with the accommodating cavities of the torsion-resistant element, the positioning ball is placed in the torsion-resistant element, and the positioning ball is in abutment with the central framework and the inner sheath at the two ends of the diameter. Compared with the traditional scheme, the scheme not only has the effect of cable torsion resistance, but also solves the problem that the cable cannot realize real-time feedback when encountering a destructive torsion force.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power cables, in particular to a wind power generation twist-resistant flexible cable. BACKGROUND

[0002] Power cables are cables used for transmitting and distributing electric energy in the power industry, which are widely used in various power transmission. With the rapid development of new energy, people begin to generate electricity by using solar energy and wind energy. For example, in wind power generation, cables are needed to transmit electric energy. However, in the area of wind power generation, the environment is harsh due to strong wind, and the cable rotates with the wind turbine, and the strong wind can blow the cable, which is easy to cause damage to the cable. Therefore, the performance requirements of the cable are relatively high in wind power generation. Since the wind power cable will produce a certain amplitude of twist during use, in serious cases, it will cause the breakage of the cable core and affect the normal transmission of electric energy. Therefore, a twist-resistant cable is needed to detect the twist state of the cable.

[0003] As disclosed in the patent document CN111599522A, an anti-twist cable provides a cable, the cable includes a twist sensor extending longitudinally along the cable, the twist sensor includes a single-mode optical fiber arranged substantially along a central longitudinal axis of the cable, the cable further includes at least three longitudinal structural elements, at least one of the longitudinal structural elements is a conductive core, wherein the twist sensor is mechanically coupled to at least one of the longitudinal structural elements; the twist state of the single-mode optical fiber is measured by polarization-sensitive optical reflectometry, and the twist state of the cable along the longitudinal axis is associated with the measured twist state of the single-mode optical fiber.

[0004] In the actual scene of wind power generation, the cable rotates with the wind turbine, and the twist state of the cable needs to be continuously detected. The patent uses an independent twist sensor to measure the twist state of the single-mode optical fiber by polarization-sensitive optical reflectometry, and associates the twist state of the cable along the longitudinal axis with the measured twist state of the single-mode optical fiber, thereby realizing the detection of the twist state of the cable. However, the device uses a single-mode optical fiber, which has the problems of high technical cost and inability to continue detecting the twist state after the single-mode optical fiber breaks. Therefore, we need a twist-resistant cable that can provide real-time feedback of the damaging twist force. SUMMARY

[0005] The present application provides a wind power generation twist-resistant flexible cable to solve the problem that the cable cannot provide real-time feedback when encountering a damaging twist force.

[0006] The application provides the following technical scheme: a wind power generation torsion-resistant flexible cable, comprising a cable core and an inner sheath, a wrapping layer, a shielding layer and an outer sheath which are sequentially wrapped outside the cable core, the cable core comprises a central skeleton arranged along a central longitudinal axis and a plurality of wires, and the cable core is characterized in that further comprising a positioning ball and a torsion-resistant member arranged along the central longitudinal axis, the torsion-resistant member is a hollow elastic member, the torsion-resistant member has a plurality of independent accommodating cavities, the accommodating cavities are filled with liquid, and the torsion-resistant member is fixed between the inner wall surface of the inner sheath and the outer surface of the central skeleton; further comprising a buffer portion with a cavity, the cavity is communicated with the accommodating cavities, the buffer portion is tightly attached to the outer side of the wires, the diameter of the outer side of the wires is abutted against the central skeleton and the inner sheath at two ends, respectively, a communication pipe which is communicated with the accommodating cavities is arranged on the torsion-resistant member, the communication pipe is sequentially communicated with the inner sheath, the wrapping layer, the shielding layer and the outer sheath, the outlet of the communication pipe is in a horn shape, and a plug is fixedly arranged at the outlet; further comprising an elastic member which is tightly attached to the outlet in an initial state, one end of the elastic member is fixedly connected with the end of the plug, and the other end of the elastic member is fixed on a stabilizing frame fixedly arranged on the wall of the communication pipe, the positioning ball is arranged in the torsion-resistant member, and the positioning ball is abutted against the central skeleton and the inner sheath at two ends.

[0007] The basic scheme principle and beneficial effects are as follows:

[0008] Because the diameter of the outer side of the wires is abutted against the central skeleton and the inner sheath at two ends, respectively, the wires are well positioned in the radial direction; because the torsion-resistant member is a hollow elastic member, the torsion-resistant member has a plurality of independent accommodating cavities, the accommodating cavities are filled with liquid, the torsion-resistant member is fixed between the inner wall surface of the inner sheath and the outer surface of the central skeleton, further comprising a buffer portion with a cavity, the cavity is communicated with the accommodating cavities, the buffer portion is tightly attached to the outer side of the wires, the elasticity of the torsion-resistant member enables the torsion-resistant member to be deformed when the torsion-resistant member is subjected to the torsion force of the wires, the liquid in the torsion-resistant member is extruded into the cavity of the buffer portion, the cavity is enlarged after a large amount of liquid flows into the cavity, and the buffer portion provides a buffer and a rebound force for the twisted wires, which undoubtedly improves the torsion resistance of the cable, the liquid in the accommodating cavities can also provide a heat dissipation effect for the wires in normal times, and when the cable catches fire, the torsion-resistant member is burned by the fire, and the liquid in the accommodating cavities flows out, which also plays a role in extinguishing the fire; because the communication pipe which is communicated with the accommodating cavities is arranged on the torsion-resistant member, the communication pipe is sequentially communicated with the inner sheath, the wrapping layer, the shielding layer and the outer sheath, the outlet of the communication pipe is in a horn shape, the plug is arranged at the outlet, the end of the plug is fixedly connected with the elastic member which is tightly attached to the outlet in an initial state, and the other end of the elastic member is fixed on the stabilizing frame fixedly arranged on the wall of the communication pipe, when the torsion-resistant member is subjected to an excessive torsion force from the wires, the deformation of the torsion-resistant member caused by extrusion enables the liquid in the accommodating cavities of the torsion-resistant member to generate a great pressure on the plug of the communication pipe, the elastic member fixed on the plug is continuously stretched until the liquid in the pipe is ejected out of the communication pipe and sprayed to the outside of the cable, so that the purpose of warning the user is achieved, and the user is prompted to timely maintenance.

[0009] Compared with the traditional scheme, the cable has improved torsion resistance, and can provide real-time feedback and timely prompt to the user when the cable is subjected to destructive torsion force, which has great practicability.

[0010] Further, the cavity cross section is circular.

[0011] The lifting buffer part improves the torsion resistance of the cable.

[0012] Further, the torsion resistance part contains pigments.

[0013] The pigments make the liquid spouted from the cable more conspicuous, achieving better warning effect.

[0014] Further, the positioning ball is made of elastic material.

[0015] The torsion resistance of the cable is improved.

[0016] Further, the wrapping layer is made of polyvinyl fluoride material.

[0017] Polyvinyl fluoride has good heat resistance, wear resistance, chemical resistance, impact strength and electrical insulation performance.

[0018] Further, the outer sheath is made of polyurethane material.

[0019] The corrosion resistance of the cable is improved.

[0020] Further, the wire includes a wire core and an insulating layer and a waterproof layer provided outside.

[0021] The extreme case of liquid leakage of the torsion resistance part eroding the wire is avoided. DETAILED DESCRIPTION

[0022] Figure 1 The structure of the present application is shown in the schematic diagram;

[0023] Figure 2 The structure of the present application is shown in the schematic diagram; DETAILED DESCRIPTION

[0024] The following will be further described in detail through specific embodiments:

[0025] The marks in the drawings of the specification include: center frame 1, wire core 2, insulating layer 3, waterproof layer 4, positioning ball 5, inner sheath 6, wrapping layer 7, shielding layer 8, sealing 9, elastic part 10, plug 11, stabilizing frame 12, outer sheath 13, torsion resistance part 14, buffer part 15.

[0026] The embodiments are as follows: Figure 1 and Figure 2 as shown:

[0027] The embodiment is a wind power generation soft cable with torsion resistance, which comprises a cable core, an inner sheath 6, a wrapping layer 7, a shielding layer 8 and an outer sheath 13 which are sequentially wrapped outside the cable core, and the cable core comprises a central skeleton 1 and a plurality of wires arranged along a central longitudinal axis, and further comprises a positioning ball 5 and a torsion resistance member 14 arranged along the central longitudinal axis.

[0028] The outer diameter of the wire is abutted against the central skeleton 1 and the inner sheath 6 at both ends, and the wire is well positioned in the radial direction.

[0029] The torsion resistance member 14 is a hollow elastic member, and is divided into a plurality of independent accommodating cavities along the central longitudinal axis direction, and the accommodating cavities are filled with liquid. The torsion resistance member 14 is fixed between the inner wall surface of the inner sheath 6 and the outer surface of the central skeleton 1, and further comprises a buffer part 15 with a cavity, and the cavity of the buffer part 15 is communicated with the accommodating cavities of the torsion resistance member 14. The buffer part 15 is tightly attached to the outer side of the wire. The elasticity of the torsion resistance member 14 itself enables it to deform when subjected to the torsion force of the wire, so that the internal liquid is extruded into the circular cross-section cavity of the buffer part 15. After a large amount of liquid flows into the circular cross-section cavity, the buffer part 15 becomes larger, providing a buffer and a rebound force for the twisted wire, which undoubtedly improves the torsion resistance of the cable. The liquid in the accommodating cavities can provide a heat dissipation effect for the wire. When the cable catches fire, the torsion resistance member 14 is burned and broken by the fire, and the liquid in the accommodating cavities will flow out, which also has the effect of extinguishing the fire.

[0030] The wire comprises a wire core 2, an insulating layer 3 and a waterproof layer 4 arranged on the outer side of the wire core 2. The waterproof layer 4 on the outer side can cope with the extreme situation of liquid leakage in the cavity when the torsion resistance member 14 is broken.

[0031] The torsion resistance member 14 is attached to the surface of the inner sheath 6 and is communicated with a communication pipe 9. The communication pipe 9 is opened to communicate the inner sheath 6, the wrapping layer 7, the shielding layer 8 and the outer sheath 13. The outlet of the communication pipe 9 is in the shape of a horn, and a plug 11 matched with the outlet is arranged at the outlet. Further, an elastic member 10 is arranged in the initial state to tightly attach the plug 11 to the outlet. One end of the elastic member 10 is welded with the end of the plug 11, and the other end of the elastic member 10 is welded on a stable frame 12 which is screw-connected to the wall of the communication pipe 9. The plug 11 completely blocks the pipe opening of the communication pipe 9 when it is in normal operation. When the torsion resistance member 14 is subjected to excessive torsion force from the wire, the deformation of the torsion resistance member 14 caused by extrusion makes the liquid in the torsion resistance member 14 generate a huge pressure on the plug 11 at the pipe opening of the communication pipe 9, so that the plug 11 at the pipe opening of the communication pipe 9 is pushed outward, and the elastic member 10 is elastically deformed. The liquid with pigment in the torsion resistance member 14 is ejected out of the inner sheath 6, the wrapping layer 7, the shielding layer 8 and the outer sheath 13 through the pipe opening of the communication pipe 9, and is sprayed to the outside of the cable, so as to achieve the purpose of warning the user and prompting the user to timely repair.

[0032] The anti-torsion component 14 contains a positioning ball 5 made of elastic material. The two ends of the positioning ball 5 abut against the central skeleton 1 and the inner sheath 6. The liquid filling the cavity inside the anti-torsion component 14 and the positioning ball 5 made of elastic material provide good buffering for the conductor when the cable is subjected to torsional force, reducing the torsional force of the conductor. At the same time, the liquid inside the anti-torsion component 14 also provides good heat dissipation for the cable. The cooperation between the positioning ball 5 inside the anti-torsion component 14 and the central skeleton 1 provides good radial support for the cable core, giving the cable a certain compressive strength.

[0033] The inner sheath 6 is designed to prevent the insulation layer 3 from being affected by moisture, mechanical damage, light and chemical corrosive media, while also allowing short-circuit current to flow through it.

[0034] The wrapping layer 7 serves to protect the insulation or inner sheath 6, acting as a buffer and padding. During cable use, different materials provide different functions such as heat insulation, corrosion prevention, and anti-aging for the cable insulation or inner sheath 6. It keeps the wire cylindrical to prevent it from loosening, prevents signal interference, and provides insulation between the conductor and the shielding layer 8. The polyvinylidene fluoride wrapping layer 7 has good heat resistance, wear resistance, and chemical resistance, as well as excellent impact strength and electrical insulation properties.

[0035] The shielding layer 8 eliminates the increase in surface electric field intensity caused by the roughness of the conductor surface and the inner sheath 6 surface.

[0036] The outer sheath 13 is made of polyurethane material, which improves the strength of the cable and provides corrosion protection.

[0037] Compared with traditional solutions, this solution not only enhances the cable's resistance to torsion, but also provides heat dissipation for the cable and real-time feedback to alert users to perform timely maintenance when the cable encounters destructive torsional forces.

[0038] The above is only an embodiment of the present application, the present application is not limited to this embodiment The field to which the embodiment relates, common knowledge of specific structures and characteristics in the scheme, etc. is not described in detail here The ordinary skilled person in the art knows all the ordinary technical knowledge in the field to which the present application belongs before the filing date or the priority date, can know all the prior art in the field, and has the ability to apply conventional experimental means before that date The ordinary skilled person in the art can perfect and implement the present scheme under the guidance of the present application, in combination with their own ability Some typical known structures or known methods should not be an obstacle to the implementation of the present application by the ordinary skilled person in the art It should be noted that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can also be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent The scope of protection claimed in the present application should be subject to the content of its claims The specific implementation in the specification can be used to explain the content of the claims

Claims

1. A wind power generation kink-resistant flexible cable comprising a core and, in order, an inner jacket, a wrapping layer, a shield layer, an outer jacket wrapped outside the core, the core comprising a central skeleton and a plurality of conductive wires arranged along a central longitudinal axis, characterized in that, Also include: The positioning ball and the anti-torque member arranged along the central longitudinal axis, the anti-torque member is a hollow elastic member, the anti-torque member has a plurality of independent accommodating cavities, the accommodating cavities are filled with liquid, the anti-torque member is fixed between the inner wall surface of the inner sheath and the outer surface of the central framework; It also includes a buffer part with a cavity, the cavity is communicated with the accommodating cavity, the buffer part is tightly attached to the outer side of the wire, the diameter of the outer side of the wire is respectively abutted against the central framework and the inner sheath, the anti-torque member is provided with a communication pipe communicated with the accommodating cavity, the communication pipe is sequentially communicated with the inner sheath, the wrapping layer, the shielding layer and the outer sheath, the outlet of the communication pipe is trumpet-shaped, and the outlet is fixedly provided with a plug; It also includes an elastic member that allows the plug to tightly fit the outlet in the initial state, one end of the elastic member is fixedly connected with the end of the plug, and the other end of the elastic member is fixed on the stabilizing frame fixed on the wall of the communication pipe, the anti-torque member is placed with a positioning ball, and the positioning ball is abutted against the central framework and the inner sheath at both ends of the diameter.

2. A kink resistant flexible cable for wind power generation according to claim 1, characterized in that: The cross section of the cavity is circular.

3. A kink resistant flexible cable for wind power generation according to claim 1, characterized in that: The anti-torque member has a pigment.

4. A kink resistant flexible cable for wind power generation according to claim 1, characterized in that: The positioning ball is made of elastic material.

5. A kink resistant flexible cable for wind power generation according to claim 1, characterized in that: The wrapping layer is made of polyvinyl fluoride material.

6. A kink resistant flexible cable for wind power generation according to claim 1, characterized in that: The outer sheath is made of polyurethane material.

7. A kink resistant flexible cable for wind power generation according to claim 1, characterized in that: The wire includes a wire core and an insulating layer and a waterproof layer provided on the outer side.

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