Three-layer insulating flame-retardant fire-resistant control cable
By employing a three-layer insulation design and material selection, the performance degradation of control cables due to moisture absorption has been resolved, insulation and flame retardant properties have been improved, costs have been reduced, service life has been extended, and the cables are suitable for various environments.
Patent Information
- Application Number
- CN202520432541.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-13
AI Technical Summary
Existing control cables suffer from reduced insulation and mechanical properties due to moisture absorption in the flame-retardant insulation layer during long-term use. At the same time, their production costs are high, resulting in an unsatisfactory cost-performance ratio.
It adopts a three-layer insulation design, including an inner insulation layer, an outer insulation layer, and a fire-resistant insulation layer, combined with a reinforced inner lining layer, an armor layer, and a reinforced outer sheath. The oxygen barrier layer design is eliminated. High electrical performance polymers and non-combustible ceramic fireproof mica tape are used to enhance insulation and flame retardant performance, and it is protected by the fire-resistant layer and the fire-resistant insulation layer.
It improves the insulation, flame retardancy, and fire resistance of cables, reduces material costs, extends service life, enhances mechanical properties, meets the requirements for bundled combustion and fire resistance tests, and is suitable for a variety of harsh environments.
Smart Images
Figure CN223956322U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to control cable technical field, especially a kind of three-layer insulation flame-retardant fire-resistant control cable. BACKGROUND
[0002] Control cable is widely used in industry, building, traffic, communication and many other fields, mainly used for signal transmission and control of production equipment, instruments, fire-fighting facilities, security, lighting system, plays a vital role in ensuring the normal operation of facilities and equipment and personnel and property safety, and occupies an important position in national economy.
[0003] In some important occasions, in order to ensure the reliability of control cable, its insulation performance, flame-retardant performance and mechanical performance are required to be higher, however, the existing control cable has some obvious defects, because the control cable is small in size, and the proportion of internal combustible is relatively large, in order to pass the flame-retardant and fire-resistant test, flame-retardant insulation layer, oxygen barrier layer and high flame-retardant sheath are usually designed, although this design can meet the requirements of flame-retardant performance, but flame-retardant materials generally have the characteristics of water absorption and moisture absorption, with the continuous extension of use time, the insulation performance and mechanical performance of cable will gradually decrease, which seriously affects the safety of cable use, in addition, this complex design also leads to high production cost of cable, and the cost performance is not ideal.
[0004] Therefore, a kind of three-layer insulation flame-retardant fire-resistant control cable is provided. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a kind of three-layer insulation flame-retardant fire-resistant control cable, can solve the problem of existing control cable, such as flame-retardant insulation moisture absorption and water absorption cause performance decline and high cost, to improve the insulation performance, mechanical performance, flame-retardant performance and fire resistance of control cable, reduce cost, improve cost performance and service life.
[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of three-layer insulation flame-retardant fire-resistant control cable, including control cable main body, the control cable main body includes conductor, insulation protective layer, fire-retardant layer, shielding layer, reinforcing inner liner, armoring layer, reinforcing outer sheath and filler, the insulation protective layer is arranged on the surface of conductor, and fire-retardant layer is arranged on the surface of filler, the shielding layer is arranged on the surface of fire-retardant layer, the reinforcing inner liner is arranged on the surface of shielding layer, the armoring layer is arranged between reinforcing inner liner and reinforcing outer sheath, and the filler is arranged at the gap of cable core;
[0007] The insulating protective layer comprises an inner insulating layer arranged on the surface of the conductor, the surface of the inner insulating layer is provided with an outer insulating layer, and the surface of the outer insulating layer is provided with a fireproof insulating layer.
[0008] Preferably, the inner insulating layer is made of any one of high electrical performance polyvinyl chloride insulation, high electrical performance polyethylene insulation and crosslinked polyethylene insulation.
[0009] Preferably, the outer insulating layer is made of any one of flame-retardant polyvinyl chloride insulation and flame-retardant polyolefin insulation.
[0010] Preferably, the outer insulating layer adopts flame-retardant polyvinyl chloride insulation and flame-retardant polyolefin insulation with an oxygen index of ≥30.
[0011] Preferably, the fireproof insulating layer and the fireproof layer are both made of non-combustible ceramicized fireproof and refractory mica tape, and are wrapped around the surface of the outer insulating layer and the filler, respectively.
[0012] Preferably, the fireproof insulating layer and the fireproof layer are both arranged in a single layer, and the non-combustible ceramicized fireproof and refractory mica tape has a thickness of 0.2 mm, and the wrapping overlap rates of the fireproof insulating layer and the fireproof layer are not less than 30% and not less than 50%, respectively.
[0013] Preferably, the reinforced inner lining layer and the reinforced outer sheath are both made of reinforced flame-retardant polyvinyl chloride sheath material or flame-retardant polyolefin sheath material, and are both made by extrusion coating.
[0014] Preferably, the shielding layer is made of soft copper wire or tinned copper wire with a diameter of 0.15-0.30 mm and a weaving density of not less than 80%, or is made of copper tape or aluminum-plastic composite tape or copper-plastic composite tape with a metal layer thickness of not less than 0.05 mm and a wrapping overlap rate of not less than 15%.
[0015] Preferably, the armor layer is made of galvanized steel wire or galvanized steel tape.
[0016] Preferably, the filler is filled with glass fiber rope or high-temperature-resistant halogen-free low-smoke filling rope.
[0017] Compared with the prior art, the utility model has the beneficial effects that:
[0018] 1. The application solves the problems of moisture absorption, water absorption and performance decline of flame-retardant insulation, improves the insulation performance, flame-retardant performance and fire resistance of the control cable main body, reduces the cable outer diameter, reduces the cable material cost and manufacturing cost, improves the performance-price ratio and service life, and the flame-retardant performance and fire resistance can meet the requirements of related bundle combustion tests and fire supply and mechanical impact and water spray fire resistance tests.
[0019] 2. The application can cancel the design of the oxygen barrier layer by setting the fire barrier layer, and the fire barrier layer and the fire barrier insulation layer form twice fire blocking effect on the insulated core, thereby enhancing the flame-retardant and fire-resistant ability of the control cable main body, and the composite design of the reinforced inner lining layer, the armored layer and the reinforced outer sheath can improve the mechanical properties and flame-retardant properties of the control cable main body. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is the overall structure diagram of the three-layer insulation flame-retardant fire-resistant control cable of the utility model.
[0021] Figure 2 It is the exploded view of the control cable main body of the utility model.
[0022] Figure 3 It is the connection diagram of the insulation protective layer and the conductor of the utility model.
[0023] In the figure, 1 is a control cable main body; 2 is a conductor; 3 is an insulation protective layer; 31 is an inner insulation layer; 32 is an outer insulation layer; 33 is a fire barrier insulation layer; 4 is a fire barrier layer; 5 is a shielding layer; 6 is a reinforced inner lining layer; 7 is an armored layer; 8 is a reinforced outer sheath; and 9 is a filler. DETAILED DESCRIPTION
[0024] 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.
[0025] Please refer to Figures 1-3 The utility model provides technical solutions:
[0026] A three-layer insulation fire-retardant fire-resistant control cable comprises a control cable main body 1, the control cable main body 1 comprising a conductor 2, an insulation protection layer 3, a fire barrier layer 4, a shielding layer 5, a reinforced inner liner 6, an armored layer 7, a reinforced outer sheath 8 and a filler 9, the insulation protection layer 3 being arranged on the surface of the conductor 2, the fire barrier layer 4 being arranged on the surface of the filler 9, the shielding layer 5 being arranged on the surface of the fire barrier layer 4, the reinforced inner liner 6 being arranged on the surface of the shielding layer 5, the armored layer 7 being arranged between the reinforced inner liner 6 and the reinforced outer sheath 8, and the filler 9 being arranged at the gap between the cable cores.
[0027] The insulation protection layer 3 comprises an inner insulation layer 31 arranged on the surface of the conductor 2, the surface of the inner insulation layer 31 being provided with an outer insulation layer 32, and the surface of the outer insulation layer 32 being provided with a fire barrier insulation layer 33.
[0028] In the embodiment, the unique three-layer insulation design ensures that the inner insulation layer 31 guarantees the insulation performance, the outer insulation layer 32 enhances the fire-retardant performance, and the fire barrier insulation layer 33 provides additional thermal insulation and fire barrier protection, thereby solving the problems of moisture absorption, water absorption and performance degradation of the fire-retardant insulation, improving the insulation performance, fire-retardant performance and fire resistance of the control cable main body 1, reducing the cable outer diameter, lowering the cable material cost and manufacturing cost, and improving the cost performance and service life, and the fire-retardant performance and fire resistance can meet the requirements of relevant bundled combustion tests and fire supply and mechanical impact and water spray fire resistance tests, respectively; the design of the oxygen isolation layer can be cancelled by arranging the fire barrier layer 4, the fire barrier layer 4 and the fire barrier insulation layer 33 together form twice fire barrier effects on the insulation cores, thereby enhancing the fire-retardant and fire-resistant capabilities of the control cable main body 1, and the composite design of the reinforced inner liner 6, the armored layer 7 and the reinforced outer sheath 8 can improve the mechanical performance and fire-retardant performance of the control cable main body 1.
[0029] Specifically, as shown in Figure 3 , the inner insulation layer 31 is composed of any one of high electrical performance polyvinyl chloride insulation, high electrical performance polyethylene insulation and cross-linked polyethylene insulation.
[0030] Specifically, as shown in Figure 3 , the outer insulation layer 32 is composed of any one of fire-retardant polyvinyl chloride insulation and fire-retardant polyolefin insulation.
[0031] Specifically, as shown in Figure 3 , the fire-retardant polyvinyl chloride insulation and the fire-retardant polyolefin insulation used by the outer insulation layer 32 have an oxygen index ≥ 30.
[0032] Specifically, as shown in Figure 2 , Figure 3 , the fire barrier insulation layer 33 and the fire barrier layer 4 are both composed of non-combustible ceramicized fire-resistant mica tape, and are respectively wrapped on the surface of the outer insulation layer 32 and the filler 9.
[0033] Specifically, as shown in Figure 2 , Figure 3 , the fire-retardant insulation layer 33 and the fire-retardant layer 4 are both single-layered, and the non-combustible ceramic fireproof mica tape has a thickness of 0.2 mm. The wrapping overlap rates of the fire-retardant insulation layer 33 and the fire-retardant layer 4 are not less than 30% and not less than 50%, respectively.
[0034] In the present embodiment: the inner insulation layer 31 is selected from any one of high electrical performance polyvinyl chloride insulation, high electrical performance polyethylene insulation, and cross-linked polyethylene insulation. These materials have excellent electrical insulation performance, which can effectively reduce the risk of leakage of the control cable body 1, ensure that the control cable body 1 maintains stable electrical performance during long-term use, and overcome the problem of insulation performance degradation caused by moisture absorption of the outer flame-retardant insulation layer, thereby providing a solid guarantee for the reliable operation of the control cable body 1, especially suitable for application scenarios with high requirements for insulation performance, such as industrial automation control systems and precision instrument connection; the outer insulation layer 32 is made of flame-retardant polyvinyl chloride insulation or flame-retardant polyolefin insulation, which has flame-retardant properties, can delay the spread of fire when a fire occurs, and reduce the damage of the fire to the control cable body 1. The flame-retardant polyvinyl chloride insulation and the flame-retardant polyolefin insulation material have good chemical stability and mechanical properties, can be closely matched with the inner insulation layer 31, and can jointly improve the overall insulation performance and flame-retardant performance of the control cable body 1, thereby ensuring electrical safety and enhancing the safety of the control cable body 1 in a fire environment, suitable for places with strict flame-retardant requirements; the fire-retardant insulation layer 33 and the fire-retardant layer 4 are both made of non-combustible ceramic fireproof mica tape. This material has the characteristics of softness, good elasticity, high strength, excellent mechanical properties, and excellent electrical insulation performance. After high-temperature ablation, a pure inorganic ceramic support shell with the properties of temperature insulation, heat insulation, fire blocking, fire prevention, fire resistance, radiation resistance, and insulation is formed. The fire-retardant insulation layer 33 is wrapped around the surface of the outer insulation layer 32, which can effectively protect the organic insulation material of the insulated core from being damaged by burning and further enhance the insulation performance. The fire-retardant layer 4 is wrapped around the surface of the filler 9, together with the fire-retardant insulation layer 33, to form double fire-blocking protection for the insulated core, thereby greatly improving the flame-retardant and fire-resistant performance of the control cable body 1 and ensuring the reliability of the control cable body 1 in a fire.
[0035] Specifically, as shown in Figure 2 , the reinforced inner lining layer 6 and the reinforced outer sheath 8 are both made of reinforced flame-retardant polyvinyl chloride sheath material or flame-retardant polyolefin sheath material, and are both made by extrusion coating.
[0036] In the embodiment, the reinforced inner layer 6 and the reinforced outer sheath 8 are made by extrusion coating of reinforced flame-retardant polyvinyl chloride sheath material or flame-retardant polyolefin sheath material, and the mechanical properties, burning shell property and flame retardancy of the sheath are improved by adding reinforcing materials such as glass fiber powder. The glass fiber powder can reduce the amount of hygroscopic flame retardants such as aluminum hydroxide (ATH) and magnesium hydroxide (MDH), reduce the hygroscopicity of the sheath, avoid performance degradation due to hygroscopicity, and at the same time, the extrusion coating process makes the sheath closely combined with the internal structure of the cable, enhances the overall protection performance of the control cable body 1, prolongs the service life of the control cable body 1, and is suitable for cable laying in various harsh environments, such as humid environments and outdoor places.
[0037] Specifically, as shown in Figure 2 , the shielding layer 5 is woven by soft copper wire or tinned copper wire with a diameter of 0.15-0.30mm, and the weaving density is not less than 80%; or it is wrapped by copper strip or aluminum-plastic composite strip or copper-plastic composite strip with a metal layer thickness of not less than 0.05mm, and the wrapping coverage rate is not less than 15%.
[0038] Specifically, as shown in Figure 2 , the armored layer 7 is wrapped by galvanized steel wire or galvanized steel strip.
[0039] Specifically, as shown in Figure 2 , the filler 9 is filled with glass fiber rope or high-temperature-resistant halogen-free low-smoke filling rope.
[0040] In the embodiment: the shielding layer 5 provides a variety of optional materials and manufacturing methods, which can ensure that the shielding layer 5 can effectively shield external electromagnetic interference, and ensure the accuracy and stability of signal transmission in the control cable body 1. In the area with complex electromagnetic environment, such as near the transformer substation, communication base station and the like, laying the control cable body 1 with such shielding layer 5 can avoid the signal from being interfered to cause malfunction or transmission error, and improve the reliability and stability of the control system; the armored layer 7 is made of galvanized steel wire or galvanized steel belt, which provides strong mechanical protection for the control cable body 1. The galvanizing treatment can prevent the steel wire or steel belt from rusting, and prolong the service life of the armored layer 7. During the laying process of the control cable body 1, the armored layer 7 can resist external mechanical external force such as extrusion and collision, and protect the insulation protective layer 3, the conductor 2 and other structures inside the control cable body 1 from being damaged. At the same time, in some environments that need to prevent rat biting and insect boring, the armored layer 7 can also play an important role to ensure the integrity and normal operation of the control cable body 1, and improve the reliability of the control cable body 1 under harsh use conditions; the filler 9 is made of glass fiber rope or high-temperature-resistant halogen-free low-smoke filling rope, which has good high-temperature resistance and low-smoke halogen-free characteristics. In the event of a fire, it will not produce a large amount of smoke and toxic gas, reducing harm to personnel and pollution to the environment. The glass fiber rope or high-temperature-resistant halogen-free low-smoke filling rope is filled in the gap between the cable core, which can stabilize the structure of the control cable body 1, reduce the shaking and friction of the core inside the control cable body 1, prevent the insulation protective layer 3 from being damaged due to core friction, and improve the overall stability and durability of the control cable body 1. It is especially suitable for places with high requirements for environmental protection and safety.
[0041] Working principle: when the control cable main body 1 is used, through the unique three-layer insulation design, the inner insulation layer 31 ensures the insulation performance, the outer insulation layer 32 enhances the flame retardant performance, the fireproof insulation layer 33 provides additional heat insulation and fireproof protection, solves the problem of moisture absorption and water absorption and performance decline of flame-retardant insulation, improves the insulation performance, flame retardant performance and fire resistance of the control cable main body 1, reduces the cable outer diameter, reduces the cable material cost and manufacturing cost, improves the performance price ratio and service life, and the flame retardance and fire resistance can meet the requirements of related bundle combustion test and fire supply and mechanical impact and water spray fire resistance test, and through the setting of the fireproof layer 4, the oxygen barrier layer design can be cancelled, the fireproof layer 4 and the fireproof insulation layer 33 form twice fireproof effect on the insulated wire core, enhance the flame retardant and fire resistance of the control cable main body, and through the composite design of the reinforced inner lining layer 6, the armored layer 7 and the reinforced outer sheath 8, the mechanical properties and flame retardant properties of the control cable main body 1 can be improved, and through the shielding layer 5, the outside electromagnetic interference can be effectively shielded, the accuracy and stability of the signal transmission in the control cable main body 1 can be ensured, the control cable main body 1 laid near the area with complex electromagnetic environment, such as the transformer substation, the communication base station and the like, through the setting of such shielding layer 5, the signal can be prevented from being interfered to cause misoperation or transmission error, and the reliability and stability of the control system can be improved.
[0042] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and 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 three-layered insulated fire-retardant fire-resistant control cable comprising a control cable body (1), characterized in that: The control cable body (1) comprises a conductor (2), an insulation protective layer (3), a fire barrier layer (4), a shielding layer (5), a reinforced inner liner (6), an armored layer (7), a reinforced outer sheath (8) and a filler (9), the insulation protective layer (3) is arranged on the surface of the conductor (2), and the fire barrier layer (4) is arranged on the surface of the filler (9); the shielding layer (5) is arranged on the surface of the fire barrier layer (4); the reinforced inner liner (6) is arranged on the surface of the shielding layer (5); the armored layer (7) is arranged between the reinforced inner liner (6) and the reinforced outer sheath (8); and the filler (9) is arranged at the gap of the cabling core. The insulation protective layer (3) comprises an inner insulation layer (31) arranged on the surface of the conductor (2), an outer insulation layer (32) arranged on the surface of the inner insulation layer (31), and a fire barrier insulation layer (33) arranged on the surface of the outer insulation layer (32).
2. A three-layered insulated fire-retardant and fire-resistant control cable as claimed in claim 1, wherein: The inner insulation layer (31) is any one of high electrical performance polyvinyl chloride insulation, high electrical performance polyethylene insulation and cross-linked polyethylene insulation.
3. A three-layered insulated fire-retardant and fire-resistant control cable as claimed in claim 2, wherein: The outer insulation layer (32) is any one of flame-retardant polyvinyl chloride insulation and flame-retardant polyolefin insulation.
4. A three-layered insulated fire-retardant and fire-resistant control cable as claimed in claim 3, wherein: The oxygen index of the flame-retardant polyvinyl chloride insulation and the flame-retardant polyolefin insulation used by the outer insulation layer (32) is greater than or equal to 30.
5. A three-layered insulated fire-retardant and fire-resistant control cable as claimed in claim 1, wherein: The fire barrier insulation layer (33) and the fire barrier layer (4) are both made of non-combustible ceramicized fire-resistant mica tape, and are wrapped around the surface of the outer insulation layer (32) and the filler (9) respectively.
6. A three-layered insulated fire-retardant and fire-resistant control cable as claimed in claim 5, characterized in that: The fire barrier insulation layer (33) and the fire barrier layer (4) are both single-layered, and the thickness of the non-combustible ceramicized fire-resistant mica tape is 0.2 mm; the wrapping overlap rate of the fire barrier insulation layer (33) and the fire barrier layer (4) is not less than 30% and not less than 50% respectively.
7. A three-layered insulated fire-retardant and fire-resistant control cable as claimed in claim 1, wherein: The reinforced inner liner (6) and the reinforced outer sheath (8) are both made of reinforced flame-retardant polyvinyl chloride sheath material or flame-retardant polyolefin sheath material, and are both made by extrusion coating.
8. A three-layered insulated fire-retardant and fire-resistant control cable as claimed in claim 1, wherein: The shielding layer (5) is made of soft copper wire or tinned copper wire with a diameter of 0.15-0.30 mm and a weaving density of not less than 80%, or is wrapped by copper tape or aluminum-plastic composite tape or copper-plastic composite tape with a metal layer thickness of not less than 0.05 mm and a wrapping overlap rate of not less than 15%.
9. A three-layered insulated fire-retardant and fire-resistant control cable as claimed in claim 1, wherein: The armored layer (7) is wrapped by galvanized steel wire or galvanized steel tape.
10. A three-layered insulated fire-retardant and fire-resistant control cable as claimed in claim 1, wherein: The filler (9) is filled by glass fiber rope or high-temperature-resistant halogen-free low-smoke filling rope.