Explosion-proof high-flame-retardant special cable

Abstract

The utility model discloses an explosion-proof high-flame-retardant special cable, which comprises a cable core and an outer protective layer wrapped on the outer surface of the cable core, the cable core comprises five wire cores, and gaps among the wire cores in the cable core are provided with explosion-proof fillers; and the outer sheath comprises two layers of explosion-proof sheaths, namely an inner sheath and an outer sheath, and the inner sheath and the outer sheath are intrinsic safety low-smoke halogen-free polyolefin sheaths. The explosion-proof cable is reasonable in structural design, and has the following beneficial effects that the explosion-proof filler is arranged in the cable core of the cable, and the two layers of explosion-proof sheaths are arranged in the outer sheath, so that explosion caused by internal sparks or electric arcs can be effectively prevented, and meanwhile, the two layers of explosion-proof sheaths are arranged as a physical isolation layer, so that the explosion-proof performance is improved. Sparks or high temperature generated by short circuit and overload in the cable are prevented from directly contacting with external explosive gas. And through cooperation of the two, the explosion risk is fundamentally reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field especially relates to a kind of explosion-proof high flame-retardant special cable. BACKGROUND

[0002] With the acceleration of industrialization, safety production consciousness is increasingly rooted in people's minds, and the market demand of explosion-proof high flame-retardant special cable shows a sustained upward trend. In the high-risk industries such as petroleum chemical industry, mining, pharmaceutical industry, the application of such cable is more and more widely. At the same time, with the continuous progress of technology and the continuous demand of market, the research and development of explosion-proof high flame-retardant special cable is continuously deepened, new products are continuously emerging, the performance is gradually improved, and the application range is continuously expanded.

[0003] Explosion-proof high flame-retardant special cable is designed for flammable and explosive places, and the core function is to realize stable transmission of power and signal under the premise of safety. In the design and manufacturing process, the cable uses special materials and processes to ensure that the insulation and sheath performance of the cable are not affected under complex working conditions such as high temperature, high pressure, corrosion and friction, so as to effectively avoid fire or explosion accidents caused by cable failure.

[0004] In the industry scenes of mine, petroleum chemical industry, ship wharf and other industries, the environment is full of a large amount of flammable and explosive gas and dust, which puts extremely strict requirements on the safety of cable. Although the existing explosion-proof cable has certain explosion-proof performance, it has obvious short board in flame-retardant, mechanical strength and ability to cope with extreme conditions. Once failure occurs, electric arc and spark are easy to cause explosion, causing serious loss of life and property. Therefore, it is urgent to develop a cable with excellent performance in flame-retardant, explosion-proof, high temperature resistance, corrosion resistance and other aspects to ensure the safety production in high-risk environment. CONTENT OF THE INVENTION

[0005] The utility model aims at providing a kind of explosion-proof high flame-retardant special cable, solve the problem of insufficient safety of existing explosion-proof cable in flammable and explosive place, still can maintain the safe and stable operation of system under extreme conditions such as high temperature, electric arc, combustible gas, effectively prevent explosion caused by cable failure.

[0006] In order to achieve the above purpose, the technical scheme of the utility model provides an explosion-proof high flame-retardant special cable, which comprises a cable core and an outer sheath wrapped outside the cable core. The cable core comprises five wire cores, and has a 4+1 core structure. The four cores are main wire cores, and the one core is a ground wire. An explosion-proof filler is arranged in the gap between the wire cores in the cable core. The outer sheath has a multi-layer structure, which includes two explosion-proof sheaths, namely an inner sheath and an outer sheath. The inner sheath and the outer sheath are intrinsically safe, low-smoke and halogen-free polyolefin sheaths.

[0007] Further, the four cores in the 4+1 core structure are in a fan shape, and the one core is in a circular shape.

[0008] Further, the four cores in the 4+1 core structure are composed of three phase lines and one zero line.

[0009] Further, the wire core is a three-layer structure, including a conductor in the center of the wire core, a fireproof layer wrapped outside the conductor, and an insulation layer wrapped outside the fireproof layer.

[0010] Further, the conductor is a type 2 annealed tight copper conductor composed of multiple strands of copper wire twisted and pressed together; the fireproof layer is a synthetic mica tape; and the insulation layer is a cross-linked polyethylene layer.

[0011] Further, the explosion-proof filler is a glass fiber filler.

[0012] Further, the outer sheath structure is provided with six layers, and from the inside to the outside, they are a wrapping tape, a waterproof layer, a waterproof tape, an inner sheath, an armor, and an outer sheath.

[0013] Further, the wrapping tape is a layer of ceramicized silicone rubber tape; and the waterproof layer is a PE sheath.

[0014] Further, the armor is two layers of galvanized steel tape.

[0015] Further, the cable core and the cable have a circular cross-sectional shape.

[0016] In summary, the device structure of the present application has the following advantages: the cable core is provided with an explosion-proof filler, and the outer sheath is provided with two layers of explosion-proof sheaths, which can effectively prevent internal sparks or arcs from causing explosions, and the two layers of explosion-proof sheaths serve as physical isolation layers to prevent sparks or high temperatures generated by internal short circuits or overloads from directly contacting external explosive gases. The two work together to fundamentally reduce the risk of explosion. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a cross-sectional structure schematic diagram of the explosion-proof high-flame-retardant special cable of the present application;

[0018] Marked: 1-conductor; 2-fireproof layer; 3-insulation layer; 4-explosion-proof filler; 5-wrapping tape; 6-waterproof layer; 7-waterproof tape; 8-inner sheath; 9-armor; 10-outer sheath. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, but do not constitute a limitation on the protection scope of the present application.

[0020] In the utility model, in order to describe more clearly, make the following description: the observer faces the attached Figure 1 Observation, the observer left front side is set as front, the observer right rear side is set as rear, the observer left rear is set as left, the observer right front is set as right, the observer upper surface is set as upper, the observer lower surface is set as lower, it should be indicated that the terms "front end", "rear end", "left side" "right side", "middle part", "upper side", "lower side" in the text indicate the direction or positional relationship based on the drawing direction or positional relationship, just for the convenience of clearly describing the utility model, and not indicate or imply that the structure or part must have a particular direction, is constructed with a particular direction, therefore can not be understood as the limitation to the utility model.In addition, the terms "first", "second", "third", "fourth" are only for the purpose of clarity or simplification of description, and can not be understood as indicating or implying relative importance or quantity.

[0021] As an important special cable, the explosion-proof high-flame-retardant special cable plays a crucial role in ensuring safety production and personnel life safety in flammable and explosive environments.With the rapid development of industrial automation and intelligent manufacturing, and the increasingly stringent environmental regulations, the market demand for explosion-proof high-flame-retardant special cable will continue to grow, and the industry has broad development prospects.

[0022] Referring to Figure 1 The utility model provides a kind of explosion-proof high-flame-retardant special cable, including cable core and the outer sheath of wrapping in the outer surface of cable core, cable core includes 5 wire cores, it is 4+1 core structure, 4 cores are main wire core, 1 core is ground wire;Explosion-proof filler 4 is provided at the gap between wire core and wire core in cable core;Outer sheath is multilayer structure, including two explosion-proof sheaths, respectively, inner sheath 8 and outer sheath 10, inner sheath 8 and outer sheath 10 are intrinsically safe low-smoke halogen-free polyolefin sheath.

[0023] Specifically, 4+1 core structure 4 core is fan-shaped structure, and 1 core in it is circular structure.Specifically, 4+1 core structure 4 core is composed of 3 phase wires + 1 zero wire.

[0024] Specifically, wire core is 3-layer structure, including conductor 1 located in the center of wire core, fireproof layer 2 wrapped outside conductor 1, and insulation layer 3 wrapped outside fireproof layer 2.Specifically, conductor 1 is the 2nd annealed tight copper conductor, which is tightly pressed by twisting multiple copper wires;Fireproof layer 2 is synthetic mica tape;Insulation layer 3 is crosslinked polyethylene layer.

[0025] Conductor 1 adopts the 2nd annealed tight copper conductor, which is tightly pressed by twisting multiple copper wires, and the tight copper conductor has excellent electrical conductivity, mechanical strength and production efficiency, which not only improves the efficiency and safety of power transmission, but also reduces the long-term operation cost.

[0026] The fireproof layer 2 is wrapped by a synthetic mica tape, and the melting point of the mica is extremely high (the synthetic mica can reach above 1000℃), which will not melt or decompose in a fire, can maintain the insulation performance, and prevent the short circuit of the electric current.

[0027] The insulation material of the insulation layer 3 is cross-linked polyethylene, which can provide good insulation performance, has good elasticity and flexibility, and is used as the insulation layer 3 in the explosion-proof electrical equipment, and can reduce the risk of short circuit or overheating due to the high temperature resistance, low conductivity and stability, and meet the intrinsic safety requirements.

[0028] Specifically, the explosion-proof filler 4 is a glass fiber filler.

[0029] In the explosion-proof cable, the filler ensures the stability of the cable structure and improves the explosion-proof performance. The core function is to prevent internal sparks or arcs from causing explosions by filling the gaps between the conductors 1, and to enhance mechanical protection and environmental adaptability. In the gap filling of the multi-core cable, the glass fiber rope prevents the formation of combustible gas diffusion channels inside the cable, absorbs the heat generated by the fault arc, and reduces the local temperature peak.

[0030] Preferably, the explosion-proof filler 4 can be a glass fiber rope + ceramicized silicone rubber (or intumescent flame retardant), which realizes the triple effect of “physical isolation + active heat absorption + carbonization sealing”. The glass fiber provides mechanical support, and the ceramicized material expands to fill the gap when it encounters fire, which together blocks gas diffusion and heat transfer.

[0031] As a preferred embodiment of the utility model, the outer protective layer structure is provided with 6 layers, which are the wrapping tape 5, the waterproof layer 6, the waterproof tape 7, the inner sheath 8, the armor 9 and the outer sheath 10 from inside to outside. Specifically, the wrapping tape 5 is a layer of ceramicized silicone rubber tape; the waterproof layer 6 is a PE sheath. Specifically, the armor 9 is two layers of galvanized steel tape.

[0032] The wrapping tape 5 is a ceramicized silicone rubber tape, which is wrapped with a layer of ceramicized silicone rubber tape during cabling. The ceramicized silicone rubber tape melts and combines with the decomposition products of the silicone rubber in a 500℃-1000℃ flame, forming a porous ceramic layer that isolates oxygen and heat.

[0033] The waterproof layer 6 and the waterproof tape 7 form a double-layer waterproof structure to achieve the waterproof function.

[0034] The waterproof layer 6 is extruded by PE sheath material, and the main function of the waterproof layer 6 is to protect the insulation layer 3 of the cable from damage, and also has the waterproof function, which can prevent the insulation layer 3 from being affected by water, mechanical damage, light and chemical corrosive medium. In addition, the waterproof layer 6 can also help the cable to pass through the short circuit current, so as to ensure that the cable can maintain good electrical performance under various use conditions.

[0035] The cable waterproof layer 6 is wrapped with a waterproof tape 7, and the main function is to prevent water from entering and protect the internal structure of the cable from water damage. It ensures that the cable can operate stably in a humid, underwater or high-pressure water environment for a long time.

[0036] The inner sheath 8 is made of intrinsically safe low-smoke halogen-free polyolefin material, which can prevent the electric spark or high temperature generated by internal short circuit or overload from directly contacting the external explosive gas (such as methane and hydrogen), limit the spread of electric arc in the cable, and avoid triggering a chain explosion. The inner sheath 8 absorbs mechanical stress, protects the internal conductor 1 and the insulation layer 3 from damage, reduces the friction between the internal structure and the outer sheath, and prevents the insulation layer 3 from being aged or broken due to long-term friction.

[0037] Then the inner sheath 8 is wrapped with two layers of galvanized steel belts with gaps, which is mainly used to enhance the mechanical strength and protection ability of the cable. The steel belt armor cooperates with the inner sheath 8, the explosion-proof filler 4 and other components to form a physical isolation layer, which prevents the internal spark or high temperature caused by short circuit or overload from directly contacting the external explosive gas.

[0038] The outer sheath 10 is made of intrinsically safe low-smoke halogen-free polyolefin material, which can suppress flame spread, reduce combustion toxicity, and prevent external high temperature, spark or explosion impact from directly damaging the internal structure of the cable.

[0039] Specifically, the cable core and the cross-sectional shape of the cable are circular.

[0040] The utility model discloses a flame-retardant system + sealing structure + arc suppression for explosion-proof, and the specific implementation is as follows:

[0041] Flame-retardant system, suppress flame: the outer sheath 10 is made of intrinsically safe low-smoke halogen-free polyolefin material, which can suppress flame spread. The insulation layer 3 uses crosslinked polyethylene (XLPE), which is resistant to high temperature and has low conductivity, reducing the risk of short circuit. The wrapping tape 5 is a ceramicized silicone rubber tape that isolates oxygen and heat.

[0042] Sealing structure, avoid gas penetration through gap: the armor 9 is two layers of galvanized steel belts that form a physical isolation layer to prevent internal spark from escaping. The waterproof layer 6 uses PE sheath to block external moisture and chemical corrosion.

[0043] Arc suppression: the armor 9 isolates the internal arc from the external environment. The crosslinked polyethylene insulation layer reduces the risk of short circuit.

[0044] The utility model discloses a kind of explosion-proof high flame-retardant special cables, it is applicable to mine, petroleum chemical industry, ship wharf and other flammable and explosive places, it is the cable product specially designed for high-risk explosive environment, and it is far more than existing explosion-proof cable in flame-retardant performance, mechanical strength and explosion-proof ability.The core target is to prevent cable failure from causing explosion, and maintain system safe operation under extreme conditions (such as high temperature, electric arc, combustible gas environment).The main difference from existing explosion-proof cable is its explosion-proof performance and safety design, and it has better explosion-proof, flame-retardant, high-temperature resistant, corrosion-resistant and other performances than existing explosion-proof cable.

[0045] The utility model explosion-proof high flame-retardant special cable can effectively prevent explosion by special structure and material design;Meanwhile, as an important safety protection equipment, explosion-proof high flame-retardant special cable plays a key role in many industries.Its main features are as follows:

[0046] 1, explosion-proof design

[0047] Special materials and structure design are adopted, and in terms of material selection, explosion-proof cable uses intrinsically safe material resistant to high temperature and corrosion to manufacture insulation layer 3, inner sheath 8 and outer sheath 10, so as to improve the durability and safety of cable;In terms of structure design, explosion-proof cable focuses on tensile strength, pressure resistance and sealing performance, and high-strength armor 9 layer and outer sheath are adopted to ensure the stability of cable in dangerous environment, so as to prevent electric arc, spark and other conditions that may cause explosion.Even when short circuit or electric spark occurs, it will not ignite surrounding flammable and explosive gas.

[0048] 2, flame retardancy

[0049] Flame-retardant materials are used to manufacture, which can slow down the spread of fire when fire occurs, so that explosion-proof cable is safer and more reliable in dangerous environment.

[0050] 3, high-strength structure

[0051] Focus on tensile strength, pressure resistance and sealing performance, and high-strength armor 9 layer and outer sheath are adopted to ensure the stability of cable in dangerous environment.

[0052] 4, waterproof performance

[0053] Cable uses high-density waterproof materials, which have natural waterproof performance, can effectively prevent water from penetrating into the cable, and ensure that cable can maintain good electrical insulation performance when immersed in water for a long time or under large water pressure.

[0054] The above is the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled person in the art, without departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the utility model.

Claims

1. An explosion-proof, high flame-retardant special cable comprising a core and an outer sheath wrapped around the outer surface of the core, characterized in that: The cable core comprises five wire cores, and is a 4+1 core structure, the four cores are main wire cores, and the one core is a ground wire; the space between the wire cores in the cable core is provided with an explosion-proof filler; the outer sheath is a multilayer structure, and comprises two explosion-proof sheaths, namely an inner sheath and an outer sheath; the inner sheath and the outer sheath are intrinsically safe low-smoke halogen-free polyolefin sheaths.

2. The anti-explosion and high flame-retardant special cable according to claim 1, characterized in that: The four cores in the 4+1 core structure are in a fan-shaped structure, and the one core is in a circular structure.

3. The anti-explosion and high flame-retardant special cable according to claim 2, characterized in that: The four cores in the 4+1 core structure are composed of three phase wires and one zero wire.

4. The anti-explosion and high flame-retardant special cable according to any one of claims 1-3, characterized in that: The wire core is a three-layer structure, comprising a conductor in the center of the wire core, a fire-resistant layer wrapped outside the conductor, and an insulation layer wrapped outside the fire-resistant layer.

5. The explosion-proof high flame retardant special cable according to claim 4, characterized in that: The conductor is a type 2 annealed tight copper conductor, which is tightly pressed by twisting a plurality of copper wires; the fire-resistant layer is a synthetic mica tape; and the insulation layer is a cross-linked polyethylene layer.

6. The explosion-proof high flame-retardant special cable according to claim 5, characterized in that: The explosion-proof filler is a glass fiber filler.

7. The anti-explosion and high flame-retardant special cable according to claim 1 or 2 or 3 or 5 or 6, characterized in that: The outer sheath structure is provided with six layers, and from inside to outside, the layers are a wrapping tape, a waterproof layer, a waterproof tape, an inner sheath, an armor, and an outer sheath.

8. The explosion-proof high flame-retardant special cable according to claim 7, characterized in that: The wrapping tape is a layer of ceramicized silicone rubber tape; and the waterproof layer is a PE sheath.

9. The explosion-proof high flame-retardant special cable according to claim 8, characterized in that: The armor is two layers of galvanized steel tape.

10. The explosion-proof high flame-retardant special cable according to claim 1 or 2 or 3 or 5 or 6 or 8 or 9, characterized in that: The cross-sectional shape of the cable core and the cable is circular.

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