Environment-friendly composite power cable

Abstract

The invention discloses an environment-friendly composite power cable, and relates to the technical field of power cables, the environment-friendly composite power cable comprises an outer sheath unit, the outer sheath unit comprises a sheath assembly, a flame-retardant assembly installed in the sheath assembly and a fire extinguishing assembly installed in the flame-retardant assembly, and the fire extinguishing assembly penetrates through the flame-retardant assembly and is connected with the sheath assembly. Through triggering of the fire extinguishing assembly and a flame-retardant medium release structure, active intervention can be achieved before thermal runaway of a conductor, fire prevention is upgraded to beforehand prevention from traditional postmortem blocking, the fire risk is reduced, meanwhile, through collaborative design of an insulating layer arranged in a gradient mode, a metal net and an armoring structure, the flame-retardant effect is enhanced, and meanwhile the fire extinguishing effect is improved. According to the cable, the conductivity, insulation, interference resistance and flexibility of the cable are fully guaranteed, normal operation is prevented from being affected by flame-retardant design, the long-term stable use requirement is met, and through a three-dimensional protection structure formed by the buffer layer, the thermal insulation layer, the filling layer and the outer sheath, longitudinal and transverse spreading of flame can be blocked, and the fire-retardant capability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to an environmentally friendly composite power cable. Background Art

[0002] Power cable is a cable product used to transmit and distribute high-power electrical energy in the trunk lines of the power system. The basic structure of power cable consists of four parts: wire core, insulation layer, shielding layer and protective layer.

[0003] Most existing cables adopt a "passive fire-retardant" design. For example, the traditional insulation layer relies on a single flame retardant filling, which makes it difficult to balance insulation performance and flame retardant effect. The internal filling layer only serves to fill the gap and easily becomes a channel for the horizontal spread of flames. At the same time, there is a lack of a mechanism to inhibit local high temperatures caused by conductor overload and short circuit, which makes it easy to miss the opportunity for initial fire extinguishing and easily cause secondary fires. In addition, the outer structure such as the shielding layer and the inner sheath does not have an integrated flame retardant function, and it is impossible to form a multi-layer collaborative fire-retardant system, and the flame retardant efficiency is low. Summary of the Invention

[0004] In view of the above problems existing in the existing environmentally friendly composite power cables, the present invention is proposed.

[0005] Therefore, the present invention provides an environmentally friendly composite power cable, the purpose of which is to solve the problems that the traditional insulation layer is difficult to achieve both insulation and flame retardancy, the internal filling layer easily helps the flame spread horizontally, the lack of a conductor high-temperature suppression mechanism easily leads to initial fire failure and causes secondary fires, and the outer layer structure does not have integrated flame retardancy and cannot achieve multi-layer coordinated fire resistance, resulting in low efficiency.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an environmentally friendly composite power cable, characterized in that: it includes an outer sheath unit, including a sheath component, a flame retardant component installed inside the sheath component, a cable conductor installed inside the flame retardant component, and a fire extinguishing component installed on the outer wall of the flame retardant component, and the fire extinguishing component passes through the flame retardant component and is connected to the sheath component; the sheath component includes an outer sheath, a flame retardant adhesive layer installed inside the outer sheath, a tinned copper mesh installed inside the flame retardant adhesive layer for supporting the outer sheath and the flame retardant adhesive layer, an insulating layer installed inside the tinned copper mesh for buffering, and a steel wire armor installed inside the insulating layer for protecting the insulating layer; the steel wire armor supports the external flame retardant adhesive layer and the outer sheath, cooperates with the insulating layer to insulate and protect the flame retardant adhesive layer and the outer sheath, and cooperates with the tinned copper mesh to provide double-layer flexible support for the outer sheath; when the internal flame retardant component is at high temperature, the tinned copper mesh and the steel wire armor seal and flame retard the flame retardant component.

[0007] As a preferred solution of the environmentally friendly composite power cable of the present invention, the outer wall of the tinned copper mesh is provided with heat dissipation grooves for conducting flow, and the heat dissipation grooves are respectively connected to the flame retardant adhesive layer and the insulation layer.

[0008] As a preferred solution of the environmentally friendly composite power cable of the present invention, the flame retardant component includes a split layer and an isolation layer installed inside the split layer for sealing.

[0009] As a preferred solution of the environmentally friendly composite power cable of the present invention, a composite buffer layer for buffering is provided inside the isolation layer, and the composite buffer layer is fixedly connected to the cable conductor.

[0010] As a preferred solution of the environmentally friendly composite power cable of the present invention, a ceramic silicone rubber layer for flame retardancy is provided inside the isolation layer, and the ceramic silicone rubber layer is connected to the composite buffer layer.

[0011] As a preferred solution of the environmentally friendly composite power cable of the present invention, an aerogel filling layer for absorbing smoke is provided inside the ceramic silicone rubber layer.

[0012] As a preferred solution of the environmentally friendly composite power cable described in the present invention, the fire extinguishing assembly includes a trigger tube, a dividing piece installed on the outer wall of the trigger tube for dividing the interior of the cable, and a cavity arranged inside the trigger tube.

[0013] As a preferred solution of the environmentally friendly composite power cable of the present invention, flame-retardant gas is provided inside the cavity.

[0014] As a preferred solution of the environmentally friendly composite power cable of the present invention, a trigger block for triggering is provided on the outer wall of the trigger tube, and the trigger block is connected to the ceramic silicone rubber layer.

[0015] As a preferred solution of the environmentally friendly composite power cable of the present invention, a release groove is provided on the outer wall of the trigger tube, and the release groove is connected to the trigger block.

[0016] Beneficial effects of the present invention: The present invention can actively intervene before thermal runaway occurs in the conductor through the triggering of the fire extinguishing component and the release structure of the flame retardant medium, upgrading fire prevention from traditional post-blocking to pre-prevention, reducing the risk of fire. At the same time, the gradient-arranged insulation layer and the coordinated design of the metal mesh and armor structure can fully ensure the conductivity, insulation, anti-interference and flexibility of the cable while enhancing the flame retardant effect, avoiding the impact of the flame retardant design on normal operation, and meeting the needs of long-term stable use. The three-dimensional protective structure formed by the buffer layer, thermal insulation layer, filling layer and outer sheath can block the vertical and horizontal spread of the flame, construct multiple fire barriers, and improve the fire resistance. The overall structure adopts an environmentally friendly approach to reduce the release of harmful products during combustion, thereby improving the overall scope of application and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of the environmentally friendly composite power cable of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the environmentally friendly composite power cable of the present invention.

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the environmentally friendly composite power cable of the present invention.

[0021] Figure 4 This is a schematic cross-sectional view of the environmentally friendly composite power cable of the present invention.

[0022] Figure 5 This is a schematic structural diagram of the trigger assembly of the environmentally friendly composite power cable of the present invention.

[0023] Figure 6 This is a schematic cross-sectional view of the trigger assembly of the environmentally friendly composite power cable of the present invention.

[0024] Explanation of the accompanying reference numerals: 100, outer sheath unit; 101, sheath assembly; 1011, outer sheath; 1012, flame-retardant adhesive layer; 1013, tinned copper mesh; 1014, insulation layer; 1015, steel wire armor; 1016, heat dissipation slot; 201, flame-retardant assembly; 2011, partition layer; 2012, isolation layer; 2013, ceramic silicone rubber layer; 2014, composite buffer layer; 2015, aerogel filling layer; 202, cable conductor; 301, fire extinguishing assembly; 3011, trigger tube; 3012, partition; 3013, trigger block; 3014, cavity; 3015, release slot. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] Example 1, with reference to Figure 1 - Figure 2 , which is the first embodiment of the present invention, provides an environmentally friendly composite power cable, which includes an outer sheath unit 100, including a sheath component 101 for sealing the entire device and forming an integral body, a cable conductor 202 installed inside the flame retardant component 201 for normal conductive transmission, and a fire extinguishing component 301 installed on the outer wall of the flame retardant component 201, and the fire extinguishing component 301 penetrates the flame retardant component 201 and is connected to the sheath component 101, the flame retardant component 201 installed inside the sheath component 101, the internal temperature of the cable conductor 202 is too high, generating a risk of combustion In this state, the flame retardant component 201 can prevent the spread of combustion; the fire extinguishing component 301 installed inside the flame retardant component 201 can actively extinguish the burning cable conductor 202, and the fire extinguishing component 301 passes through the flame retardant component 201 and is connected to the sheath component 101, and divides the inner cavity of the flame retardant component 201 to ensure that when a certain independent cable conductor 202 inside is burning, it will not spread to other independent cable conductors 202. At the same time, the fire extinguishing component 301 can accurately extinguish the burning independent cable conductor 202, and actively prevent possible fires.

[0027] Among them, the sheath assembly 101 includes an outer sheath 1011 made of cross-linked polyethylene insulation material, a flame retardant adhesive layer 1012 installed inside the outer sheath 1011, which is used to tightly bond the tinned copper mesh 1013 to the outer sheath 1011, thereby enhancing the flame retardancy of the cable conductor 202 and hindering flame penetration; a tinned copper mesh 1013 installed inside the flame retardant adhesive layer 1012 for supporting the outer sheath 1011 and the flame retardant adhesive layer 1012, which prevents the outer sheath 1011 from molten dripping and avoids the molten droplets of the outer sheath 1011 igniting the combustible materials inside the cable conductor 202; an insulating layer 1014 installed inside the tinned copper mesh 1013 for buffering, which prevents the flame from spreading to the outer insulation layer; a steel wire armor 1015 installed inside the insulating layer 1014 for protecting the insulating layer 1014, which supports and stabilizes the insulating layer 1014.

[0028] The steel wire armor 1015 supports the external flame retardant adhesive layer 1012 and the outer sheath 1011 and enhances the bending toughness of the outer sheath 1011. It cooperates with the insulating layer 1014 to insulate and protect the flame retardant adhesive layer 1012 and the outer sheath 1011, and cooperates with the tinned copper mesh 1013 to provide double-layer flexible support for the outer sheath 1011. The tinned copper mesh 1013 and the steel wire armor 1015 can seal and flame retard the internal flame retardant component 201 when high-temperature combustion occurs.

[0029] The outer wall of the tinned copper mesh 1013 is provided with heat dissipation grooves 1016 for conducting flow, and the heat dissipation grooves 1016 are respectively connected to the flame retardant adhesive layer 1012 and the insulating layer 1014 .

[0030] During use, first, when the flame retardant component 201 is working normally, the steel wire armor 1015 is wrapped around the outer wall of the flame retardant component 201 to support the external composite buffer layer 2014, and also to support and stabilize the internal flame retardant component 201. In addition, the cable conductor 202 can not only enhance the stability of the flame retardant component 201, but also cooperate with the outer tinned copper mesh 1013. Through the overall softness of the outer sheath 1011 and the flame retardant adhesive layer 1012, the overall bending use of the cable conductor 202 will not be affected. At the same time, the insulating layer 1014 not only seals the interior of the steel wire armor 1015, but also provides buffering protection for the internal cavity of the steel wire armor 1015 and the tinned copper mesh 1013. The buffer layer will improve the overall strength of the steel wire armor 1015 and the insulating layer 1014, improve the integration of the steel wire armor 1015 and the insulating layer 1014, and will not generate collision components in multiple directions after a collision. When a short circuit or abnormally high temperature occurs inside the flame retardant component 201, causing combustion, the steel wire armor 1015 is squeezed outward by the heat and squeezed onto the insulating layer 1014. At the same time, the insulating layer 1014 is attached to the inside of the tinned copper mesh 1013 to form an integrated structure. The steel wire armor 1015 and the tinned copper mesh 1013 form a rigid skeleton at high temperature to prevent the molten droplets of the outer sheath 1011 from igniting the combustible materials below. The insulating layer 1014 tightly bonds the double-layer metal mesh. At the same time, the flame retardant adhesive layer 1012 buffers the extrusion of the tinned copper mesh 1013, thereby enhancing the flame retardancy of the shielding layer, hindering flame penetration, and preventing the fire from spreading.

[0031] Example 2, reference Figure 1 - Figure 4 , which is the second embodiment of the present invention. This embodiment differs from the first embodiment in that: the flame retardant component 201 includes a partition layer 2011, an isolation layer 2012 installed inside the partition layer 2011 for sealing, which plays an isolation role when the cable conductor 202 burns, and a composite buffer layer 2014 installed inside the isolation layer 2012 for buffering, which plays a role in forming a continuous flame retardant barrier after internal combustion erosion to prevent the spread of fire, and the composite buffer layer 2014 is connected to the cable conductor 202, which plays a protective role when the cable conductor 202 is conducting electricity.

[0032] Among them, a ceramic silicone rubber layer 2013 for flame retardancy is provided inside the isolation layer 2012, and the ceramic silicone rubber layer 2013 is connected to the composite buffer layer 2014. When the cable conductor 202 is in normal use, the ceramic silicone rubber layer 2013 plays a supporting and filling role. When the cable conductor 202 burns, the ceramic silicone rubber layer 2013 is heated and ruptured, and the surface covering the composite buffer layer 2014 forms a flame retardant film together with the composite buffer layer 2014, and at the same time vaporizes to absorb heat and cool down, thereby blocking the horizontal spread of flames.

[0033] Among them, an aerogel filling layer 2015 for absorbing smoke is provided inside the ceramic silicone rubber layer 2013. The aerogel filling layer 2015 is made of a mixture of silica aerogel and flame-retardant polyester fiber. The aerogel blocks the heat transfer between the wire cores. The flame-retardant polyester fiber does not melt and drip at high temperature and forms a fluffy carbon layer, which absorbs toxic smoke and avoids the generation of a large amount of toxic gas when the cable conductor 202 burns.

[0034] During use, when the cable conductor 202 burns due to abnormal high temperature caused by short circuit, the ceramic silicone rubber layer 2013 is ruptured by heat and covers the surface of the composite buffer layer 2014, forming a flame retardant film together with the composite buffer layer 2014 to prevent the fire from spreading vertically. At the same time, the ceramic silicone rubber layer 2013 vaporizes to absorb heat and cool down, blocking the horizontal spread of the flame. The isolation layer 2012 and the dividing layer 2011 separate and isolate the cable conductor 202, physically isolating the flame from heat, further preventing the spread of the flame, controlling the burning point of the fire, and preventing the fire from getting bigger. The aerogel filling layer 2015 does not melt and drip at high temperature and forms a fluffy charcoal layer, which absorbs toxic smoke and prevents the escape of toxic gases.

[0035] The remaining structures are the same as those of Example 1.

[0036] Example 3, reference Figure 1 - Figure 6 , which is the third embodiment of the present invention. This embodiment differs from the second embodiment in that: the fire extinguishing assembly 301 includes a trigger tube 3011, a partition 3012 installed on the outer wall of the trigger tube 3011 for partitioning the interior of the cable conductor 202, which plays the role of partitioning the multiple cable conductors 202 so that each cable conductor 202 is independent, and a cavity 3014 installed inside the trigger tube 3011 for extinguishing the fire, which plays the role of extinguishing the burning cable conductor 202 by emitting flame-retardant gas from the cavity 3014 when the cable conductor 202 burns. Fire, and a trigger block 3013 installed on the outer wall of the trigger tube 3011 for triggering, and the trigger block 3013 is connected to the ceramic silicone rubber layer 2013, which is used to cause the ceramic silicone rubber layer 2013 to also start to burn when the cable conductor 202 burns, and the trigger block 3013 is triggered by the burning of the ceramic silicone rubber layer 2013, and the flame-retardant gas inside the cavity 3014 floats out to extinguish the fire. At the same time, through the division of the dividing piece 3012, the cable conductors 202 in different areas can be accurately divided and extinguished.

[0037] During use, when the cable conductor 202 is burned, the composite buffer layer 2014 is burned and burns together with the ceramic silicone rubber layer 2013. At the same time, the trigger block 3013 is melted due to the burning of the ceramic silicone rubber layer 2013, so that the flame-retardant gas inside the cavity 3014 floats out along the release groove 3015 of the melted trigger block 3013, and begins to extinguish the cable conductor 202 at a specific point. At the same time, through the division of the dividing piece 3012, the cable conductors 202 in different areas can be accurately divided into different areas for fire extinguishing, and multiple cable conductors 202 are respectively independent areas. In order to prevent other cable conductors 202 from burning when one cable conductor 202 is burning, with the cooperation of the ceramic silicone rubber layer 2013 and the trigger block 3013, only the burning cable conductor 202 is precisely extinguished. At the same time, the isolation protection of the sheath component 101 and the flame retardancy of the flame retardant component 201 can effectively prevent the spread and penetration of the burning. In conjunction with the active fire extinguishing of the fire extinguishing component 301, active intervention can be made before the cable conductor 202 experiences thermal runaway, upgrading fire prevention from traditional post-blocking to pre-prevention, thereby reducing the risk of fire.

[0038] The remaining structures are the same as those of Example 2.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An environmentally friendly composite power cable, characterized by: include, The outer sheath unit (100) comprises a sheath assembly (101), a flame retardant assembly (201) installed inside the sheath assembly (101), a cable conductor (202) installed inside the flame retardant assembly (201), and a fire extinguishing assembly (301) installed on the outer wall of the flame retardant assembly (201), wherein the fire extinguishing assembly (301) penetrates the flame retardant assembly (201) and is connected to the sheath assembly (101); A sheath assembly (101) comprising an outer sheath (1011), a flame retardant adhesive layer (1012) installed inside the outer sheath (1011), a tinned copper mesh (1013) installed inside the flame retardant adhesive layer (1012) for supporting the outer sheath (1011) and the flame retardant adhesive layer (1012), an insulating layer (1014) installed inside the tinned copper mesh (1013) for buffering, and a steel wire armor (1015) installed inside the insulating layer (1014) for protecting the insulating layer (1014); The steel wire armor (1015) supports the external flame retardant adhesive layer (1012) and the outer sheath (1011), cooperates with the insulation layer (1014) to insulate and protect the flame retardant adhesive layer (1012) and the outer sheath (1011), and cooperates with the tinned copper mesh (1013) to provide double-layer flexible support for the outer sheath (1011); when the internal flame retardant component (201) is in a high temperature state, the tinned copper mesh (1013) and the steel wire armor (1015) seal and flame retard the flame retardant component (201).

2. The environmentally friendly composite power cable according to claim 1, characterized in that: The outer wall of the tinned copper mesh (1013) is provided with a heat dissipation groove (1016) for conducting flow, and the heat dissipation groove (1016) is respectively connected to the flame-retardant adhesive layer (1012) and the insulating layer (1014).

3. The environmentally friendly composite power cable according to claim 2, characterized in that: The flame retardant component (201) comprises a partition layer (2011) and an isolation layer (2012) installed inside the partition layer (2011) for sealing.

4. The environmentally friendly composite power cable according to claim 3, characterized in that: A composite buffer layer (2014) for buffering is provided inside the isolation layer (2012), and the composite buffer layer (2014) is fixedly connected to the cable conductor (202).

5. The environmentally friendly composite power cable according to claim 4, characterized in that: A ceramic silicone rubber layer (2013) for flame retardancy is provided inside the isolation layer (2012), and the ceramic silicone rubber layer (2013) is connected to the composite buffer layer (2014).

6. The environmentally friendly composite power cable according to claim 5, characterized in that: An aerogel filling layer (2015) for absorbing smoke is provided inside the ceramic silicone rubber layer (2013).

7. The environmentally friendly composite power cable according to claim 6, characterized in that: The fire extinguishing assembly (301) comprises a trigger tube (3011), a dividing piece (3012) installed on the outer wall of the trigger tube (3011) for dividing the interior of the cable, and a cavity (3014) arranged inside the trigger tube (3011).

8. The environmentally friendly composite power cable according to claim 7, characterized in that: Flame-retardant gas is provided inside the cavity (3014).

9. The environmentally friendly composite power cable according to claim 6, characterized in that: A trigger block (3013) for triggering is provided on the outer wall of the trigger tube (3011), and the trigger block (3013) is connected to the ceramic silicone rubber layer (2013).

10. The environmentally friendly composite power cable according to claim 6, characterized in that: A release groove (3015) is provided on the outer wall of the trigger tube (3011), and the release groove (3015) is connected to the trigger block (3013).

Images