Novel flame-retardant explosion-proof cable
By introducing a structure of 3 power conductors, 1 neutral conductor, and 1 grounding conductor into the cable, combined with a specific insulation and shielding layer design, the problem of poor applicability of existing flame-retardant and explosion-proof cables in high-voltage and low-voltage equipment is solved, improving safety and economy.
Patent Information
- Application Number
- CN202520415022.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-11
AI Technical Summary
Existing flame-retardant and explosion-proof cables have poor applicability in high-voltage and low-voltage equipment, low safety, and pose safety hazards such as leakage current and static electricity accumulation.
It adopts a structure with 3 power conductors, 1 neutral conductor and 1 grounding protection conductor, combined with a low-capacitance insulation layer, insulation shielding layer, high flame retardant filler and sheath shielding layer design, to form a power high voltage and grounding protection circuit, eliminate leakage current and static electricity, and improve flame retardant performance.
It meets the power needs of different devices, reduces the risk of safety accidents, and improves the safety, explosion-proof performance, and economy of cables.
Smart Images
Figure CN223884193U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to cable technical field especially relates to a novel flame -retardant explosion -proof cable. BACKGROUND
[0002] With the rapid development of infrastructure construction in China, such as tunnel, subway, underground mall and underground drainage system engineering are constantly promoted, and the flame-retardant explosion-proof cable is widely used in these scenes. However, the commonly used flame-retardant explosion-proof cable on the market has many shortcomings.
[0003] At present, the flame-retardant explosion-proof cable is made of mine flame-retardant cable or ordinary flame-retardant cable with 3+2 structure, but both of them have their own shortcomings. The mine flame-retardant cable adopts the structure of 3 power line cores + 1 ground line core. The cable with "3+1" structure has no neutral line and can only be used for high-voltage power equipment. The low-voltage equipment such as lighting needs to be transformed by transformer before use. Moreover, the outer sheath cannot conduct away the external static electricity and friction static electricity, which causes safety hazards.
[0004] Another commonly used ordinary flame-retardant cable with 3+2 structure has improved structure compared with the mine flame-retardant cable, but it has no shielding layer and cannot eliminate the leakage current and static charge generated during the operation of the cable in time. In actual use, the accumulation of leakage current and static charge may also cause safety accidents, which cannot meet the needs of some places with high safety requirements.
[0005] Therefore, the above two kinds of cables have the risk of safety accidents during use. Therefore, a novel flame-retardant explosion-proof cable is proposed. CONTENT OF THE UTILITY MODEL
[0006] The utility model aims at providing a novel flame-retardant explosion-proof cable, which can solve the problem of poor applicability and low safety of the existing flame-retardant explosion-proof cable, and can improve the safety, applicability and economy of the cable.
[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a novel flame-retardant explosion-proof cable, comprising a cable main body, the cable main body comprises a conductor, a low-capacitance insulation layer, an insulation shielding layer, a high-flame-retardant filling, a wrapping tape, a high-flame-retardant sheath layer and a sheath shielding layer, the low-capacitance insulation layer is arranged on the surface of the conductor, and the insulation shielding layer is arranged on the surface of the low-capacitance insulation layer, the high-flame-retardant filling is arranged at the inter-core gap, the wrapping tape is wound and arranged on the surface of the high-flame-retardant filling, the high-flame-retardant sheath layer is arranged on the surface of the wrapping tape, and the sheath shielding layer is arranged on the surface of the high-flame-retardant sheath layer.
[0008] The conductor comprises 3 power line core conductors, 1 neutral line conductor and 1 grounding protection line conductor, and the power line core conductors and the neutral line conductor are both inside the low-capacitance insulation layer.
[0009] Preferably, the low-capacitance insulation layer is extruded from ethylene-propylene insulation rubber, and the ethylene-propylene insulation rubber has high electrical performance and low relative permittivity.
[0010] Preferably, the low-capacitance insulation layer is extruded on the surface of the power line core conductor and the neutral conductor respectively, and the eccentricity of the low-capacitance insulation layer is less than 10%.
[0011] Preferably, the insulation shielding layer is composed of a nylon semi-conductive tape, and is wrapped on the surface of the low-capacitance insulation layer.
[0012] Preferably, the thickness of the nylon semi-conductive tape is 0.2 mm, and the wrapping overlap rate is not less than 30%.
[0013] Preferably, the high-flame-retardant filling is composed of CM140B type chlorinated polyethylene high-flame-retardant rubber, and is filled in the gap between the power line core conductor, the neutral conductor and the grounding protective conductor.
[0014] Preferably, the high-flame-retardant sheath layer is composed of XH-03A sheath rubber, and is extruded on the surface of the wrapping tape.
[0015] Preferably, the sheath shielding layer is composed of semi-conductive rubber, and is extruded on the surface of the high-flame-retardant sheath layer.
[0016] Preferably, the thickness of the sheath shielding layer is 0.8 mm, and the surface of the sheath shielding layer is smooth.
[0017] Preferably, the power line core conductor, the neutral conductor and the grounding protective conductor are twisted by the fifth soft copper conductor.
[0018] Compared with the prior art, the utility model has the advantages that:
[0019] 1. The utility model forms a power high-voltage and grounding protection circuit by using three power line core conductors and one grounding protective conductor, is used for high-voltage power equipment, forms a lighting or power low-voltage and grounding protection circuit by using three power line core conductors, one neutral conductor and one grounding protective conductor, is used for low-voltage equipment, meets the power demand of different equipment, and saves the cost of transformer when the low-voltage equipment is used, thereby improving the economy.
[0020] 2. The utility model improves the insulation resistance by the setting of the low-capacitance insulation layer, reduces the leakage current, reduces the capacitance, reduces the charge accumulation, prevents safety accidents, the insulation shielding layer guides the leakage current and static electricity to the ground in time, the high-flame-retardant filling and the high-flame-retardant sheath layer improve the flame-retardant performance of the cable, and the sheath shielding layer eliminates external static electricity and friction static electricity, and these designs jointly improve the safety and explosion-proof performance of the cable greatly. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is the overall structural drawing of the novel flame-retardant explosion-proof cable of the utility model;
[0022] Figure 2 It is the schematic view of the conductor of the utility model;
[0023] Figure 3 It is the exploded schematic view of the cable main body of the utility model;
[0024] Figure 4 It is the connection schematic view of the partial conductor and the low-capacitance insulation layer and the insulation shielding layer of the utility model.
[0025] In the drawing, 1, cable main body; 2, conductor; 3, low-capacitance insulation layer; 4, insulation shielding layer; 5, high flame-retardant filling; 6, wrapping tape; 7, high flame-retardant sheath layer; 8, sheath shielding layer; 9, power line core conductor; 10, neutral line conductor; 11, grounding protective line conductor. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0027] Please refer to Figures 1-4 The utility model provides technical schemes:
[0028] A novel flame-retardant explosion-proof cable, comprising a cable main body 1, the cable main body 1 includes a conductor 2, a low-capacitance insulation layer 3, an insulation shielding layer 4, a high flame-retardant filling 5, a wrapping tape 6, a high flame-retardant sheath layer 7 and a sheath shielding layer 8, the low-capacitance insulation layer 3 is arranged on the surface of the conductor 2, and the insulation shielding layer 4 is arranged on the surface of the low-capacitance insulation layer 3, the high flame-retardant filling 5 is arranged at the interstice of the line core, the wrapping tape 6 is wound and arranged on the surface of the high flame-retardant filling 5, the high flame-retardant sheath layer 7 is arranged on the surface of the wrapping tape 6, and the sheath shielding layer 8 is arranged on the surface of the high flame-retardant sheath layer 7.
[0029] The conductor 2 includes three power line core conductors 9, one neutral line conductor 10 and one grounding protective line conductor 11, and the power line core conductor 9 and the neutral line conductor 10 are both inside the low-capacitance insulation layer 3.
[0030] In the embodiment: by using 3 power line core conductors 9 and 1 ground protection line conductor 11 to form a high-voltage power and ground protection circuit for high-voltage power equipment, using 3 power line core conductors 9, 1 neutral line conductor 10 and 1 ground protection line conductor 11 to form a lighting or low-voltage power and ground protection circuit for low-voltage equipment, meet the power demand of different equipment, at the same time, save the cost of transformer investment when using low-voltage equipment, improve the economy; by setting the low-capacitance insulation layer 3, the insulation resistance is improved, the leakage current is reduced, the capacitance is reduced, the charge accumulation is reduced, and the safety accident is prevented; the insulation shielding layer 4 guides the leakage current and static electricity to the ground in time; the high-flame-retardant filling 5 and the high-flame-retardant sheath layer 7 improve the flame-retardant performance of the cable main body 1; the sheath shielding layer 8 eliminates external static electricity and friction static electricity, these designs work together, greatly improve the safety and explosion-proof performance of the cable main body 1.
[0031] Specifically, as shown in Figure 3 , Figure 4 , the low-capacitance insulation layer 3 is extruded by ethylene-propylene insulation rubber, and high electrical performance and low relative permittivity ethylene-propylene insulation rubber is used.
[0032] Specifically, as shown in Figure 3 , Figure 4 , the low-capacitance insulation layer 3 is extruded on the surface of the power line core conductor 9 and the neutral line conductor 10, and the eccentricity of the low-capacitance insulation layer 3 is less than 10%.
[0033] Specifically, as shown in Figure 3 , Figure 4 , the insulation shielding layer 4 is composed of a nylon semi-conductive tape, and is wrapped around the surface of the low-capacitance insulation layer 3.
[0034] Specifically, as shown in Figure 3 , Figure 4 , the thickness of the nylon semi-conductive tape is 0.2mm, and the wrapping overlap rate is not less than 30%.
[0035] In the embodiment: the low-capacitance insulation layer 3 is extruded by ethylene-propylene insulation rubber with high electrical performance and low relative permittivity, the high electrical performance can improve the insulation resistance and reduce current leakage, and the low relative permittivity can reduce the capacitance and reduce the accumulation of electric charge, thereby effectively preventing safety accidents caused by heat, static electricity or sparks, and the precise extrusion process ensures the uniformity of the insulation layer, further improves the insulation performance, reduces the problem of local electric field concentration caused by uneven thickness of the insulation layer, and improves the safety and stability of the cable main body 1 in operation; the insulation shielding layer 4 is composed of a nylon semi-conductive tape and is wrapped around the surface of the low-capacitance insulation layer 3, the nylon semi-conductive tape can fully contact with the bare conductor of the grounding protective wire core, and can timely guide the leakage current and static electricity generated during the operation of the cable to the ground, effectively avoiding safety accidents caused by the accumulation of static electricity and leakage current, enhancing the safety and explosion-proof performance of the cable main body 1, and the appropriate thickness and overlap rate ensure the integrity and effectiveness of the insulation shielding layer 4, so that the insulation shielding layer 4 can better play the role of guiding the leakage current and static electricity, preventing the insulation shielding layer 4 from being exposed and unprotected, and further improving the safety of the cable main body 1 in operation.
[0036] Specifically, as shown in Figure 3 , the high-flame-retardant filling 5 is composed of CM140B type chlorinated polyethylene high-flame-retardant rubber skin, and is filled in the gap between the power line core conductor 9, the neutral line conductor 10 and the grounding protective line conductor 11.
[0037] Specifically, as shown in Figure 3 , the high-flame-retardant sheath layer 7 is composed of XH-03A sheath rubber, and is extruded on the surface of the wrapping tape 6.
[0038] In the embodiment: the high-flame-retardant filling 5 is composed of CM140B type chlorinated polyethylene high-flame-retardant rubber skin, the oxygen index of the high-flame-retardant material is ≥45, which can form a flame-retardant barrier inside the cable main body 1, effectively prevent flame spread even if the circuit is short-circuited or sparks are generated, and improve the overall flame-retardant performance and explosion-proof performance of the cable main body 1; the high-flame-retardant sheath layer 7 is composed of XH-03A sheath rubber, the oxygen index of XH-03A sheath rubber is ≥42, which has good flame-retardant performance and provides external protection for the cable main body 1, and cooperates with the high-flame-retardant filling 5 to further enhance the flame-retardant and explosion-proof ability of the cable main body 1, and ensure the safe use of the cable main body 1 in harsh environments.
[0039] Specifically, as shown in Figure 3 , the sheath shielding layer 8 is composed of semi-conductive rubber, and is extruded on the surface of the high-flame-retardant sheath layer 7.
[0040] Specifically, as shown in Figure 3 , the thickness of the sheath shielding layer 8 is 0.8mm, and the surface of the sheath shielding layer 8 should be smooth.
[0041] In the embodiment, the sheath shielding layer 8 is made of semi-conductive rubber with a thickness of 0.8 mm, which can eliminate external static electricity and friction static electricity, avoid safety risks caused by static electricity accumulation, and is especially suitable for flammable and explosive places sensitive to static electricity, thereby further improving the safety and explosion-proof performance of the cable main body 1.
[0042] Specifically, as shown in Figure 3 The power line core conductor 9, the neutral conductor 10 and the grounding protection conductor 11 are all made of the fifth kind of soft copper conductor.
[0043] In the embodiment, the power line core conductor 9, the neutral conductor 10 and the grounding protection conductor 11 are all made of the fifth kind of soft copper conductor, which has good flexibility and conductivity. The flexibility facilitates the bending of the cable main body 1 during laying and adapts to different installation environments. The excellent conductivity can reduce the conductor resistance, reduce the loss in the process of power transmission, and improve the power transmission efficiency and stability of the cable main body 1.
[0044] Working principle: when the cable main body 1 is used, the three power line core conductors 9 and the one grounding protection conductor 11 form a high-voltage power circuit and a grounding protection circuit, which are used for high-voltage power equipment. The three power line core conductors 9, the one neutral conductor 10 and the one grounding protection conductor 11 form a lighting or low-voltage power circuit and a grounding protection circuit, which are used for low-voltage equipment, thereby meeting the power demand of different equipment, saving the cost of transformer when low-voltage equipment is used, and improving the economy. The low-capacitance insulation layer 3 can improve the insulation resistance of the cable main body 1, reduce the leakage current, reduce the capacitance, reduce the charge accumulation, and prevent safety accidents. The insulation shielding layer 4 can guide the leakage current and static electricity to the ground. The high-flame-retardant filling 5 and the high-flame-retardant sheath layer 7 improve the flame-retardant performance of the cable main body 1. The sheath shielding layer 8 eliminates external static electricity and friction static electricity. These designs work together to greatly improve the safety and explosion-proof performance of the cable main body 1.
[0045] The above is only a preferred embodiment of the utility model, and does not limit the utility model. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A novel flame-retardant explosion-proof cable comprising a cable body (1), characterized in that: The cable body (1) comprises a conductor (2), a low-capacitance insulation layer (3), an insulation shielding layer (4), a high-flame-retardant filling (5), a wrapping tape (6), a high-flame-retardant sheath layer (7) and a sheath shielding layer (8), the low-capacitance insulation layer (3) is arranged on the surface of the conductor (2), and the insulation shielding layer (4) is arranged on the surface of the low-capacitance insulation layer (3), the high-flame-retardant filling (5) is arranged at the inter-core gap, the wrapping tape (6) is wound and arranged on the surface of the high-flame-retardant filling (5), the high-flame-retardant sheath layer (7) is arranged on the surface of the wrapping tape (6), and the sheath shielding layer (8) is arranged on the surface of the high-flame-retardant sheath layer (7). The conductor (2) comprises three power core conductors (9), one neutral conductor (10) and one ground protection conductor (11), and the power core conductors (9) and the neutral conductor (10) are arranged inside the low-capacitance insulation layer (3).
2. A novel fire-retardant and explosion-proof cable according to claim 1, characterized in that: The low-capacitance insulation layer (3) is made of ethylene-propylene insulation rubber and is extruded, and the ethylene-propylene insulation rubber has high electrical performance and low relative permittivity.
3. A novel fire-retardant and explosion-proof cable according to claim 2, characterized in that: The low-capacitance insulation layer (3) is extruded and arranged on the surface of the power core conductors (9) and the neutral conductor (10), and the eccentricity of the low-capacitance insulation layer (3) is less than 10%.
4. A novel fire-retardant and explosion-proof cable according to claim 1, characterized in that: The insulation shielding layer (4) is made of a nylon semi-conductive tape and is wrapped around the surface of the low-capacitance insulation layer (3).
5. A novel fire-retardant and explosion-proof cable according to claim 4, characterized in that: The thickness of the nylon semi-conductive tape is 0.2 mm, and the wrapping overlap rate is not less than 30%.
6. A novel fire-retardant explosion-proof cable according to claim 1, characterized in that: The high-flame-retardant filling (5) is made of CM140B type chlorinated polyethylene high-flame-retardant rubber and is filled in the gap between the power core conductors (9), the neutral conductor (10) and the ground protection conductor (11).
7. A novel fire-retardant and explosion-proof cable as claimed in claim 1, wherein: The high-flame-retardant sheath layer (7) is made of XH-03A sheath rubber and is extruded and arranged on the surface of the wrapping tape (6).
8. A novel fire-retardant and explosion-proof cable as claimed in claim 1, wherein: The sheath shielding layer (8) is made of semi-conductive rubber and is extruded and arranged on the surface of the high-flame-retardant sheath layer (7).
9. A novel fire-retardant and explosion-proof cable as claimed in claim 1, wherein: The thickness of the sheath shielding layer (8) is 0.8 mm, and the surface of the sheath shielding layer (8) is smooth.
10. A novel fire-retardant explosion-proof cable as claimed in claim 1, wherein: The power core conductors (9), the neutral conductor (10) and the ground protection conductor (11) are all made of the fifth type of soft copper conductor and are twisted.