Fireproof flame-retardant control cable

Abstract

The utility model discloses a fireproof flame-retardant control cable which comprises an outer sheath, an outer mica tape wrapping layer, a low-smoke halogen-free flame-retardant layer and an inner mica tape wrapping layer from outside to inside in sequence, and two first cable units and a second cable unit located between the two first cable units are arranged in the inner mica tape wrapping layer. The control cable is provided with the outer mica tape wrapping layer, the inner mica tape wrapping layer, the low-smoke halogen-free flame-retardant layer and the oxygen barrier layer, so that the fireproof and flame-retardant effects are good. The first cable unit and the second cable unit are embedded and matched, so that the internal structure of the cable is compact, mutual support is provided when the cable is subjected to external force, and the cable is prevented from deformation or damage. In addition, the first filling unit and the second filling unit increase the voltage-withstanding effect of the cable, so that the first cable unit and the second cable unit are protected.

Description

Technical Field

[0001] The utility model relates to the field of cables, and more specifically, to a fire-resistant and flame-retardant control cable. Background Art

[0002] With the rapid development of modern industry and the continuous improvement of automation, control cables are increasingly widely used in various fields. Control cables are widely used in industries such as electric power, transportation, water conservancy, chemical industry, and metallurgy, providing a strong guarantee for the normal operation and automatic control of various equipment.

[0003] Existing control cables only have a single layer of flame-retardant or fire-resistant material, and it is difficult to maintain the integrity and electrical performance of the cable under long-term high temperature or fire conditions. The flame-retardant performance of some cables is limited, unable to effectively prevent the spread of fire, and may produce toxic smoke during combustion, posing a threat to personnel evacuation and rescue work. The cable core layout of some control cables is not compact enough, resulting in a loose overall structure of the cable, and it is easy to deform or damage when subjected to external forces. In addition, the voltage resistance effect of some cables is not good, resulting in the cable being unable to provide sufficient support and buffering when subjected to external pressure, thereby affecting the electrical performance and service life of the cable. Summary of the Utility Model

[0004] The utility model aims to overcome the defects of the prior art and provide a fire-resistant and flame-retardant control cable.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A control cable, which sequentially includes an outer sheath, an outer mica tape wrapping layer, a low-smoke and halogen-free flame-retardant layer, and an inner mica tape wrapping layer from outside to inside. Two first cable units and a second cable unit located between the two first cable units are arranged inside the inner mica tape wrapping layer. The first cable unit includes a first inner sheath and two first cable cores located inside the first inner sheath. The two first cable cores are arranged side by side in the horizontal direction. The second cable unit includes a second inner sheath and three second cable cores located inside the second inner sheath. The three second cable cores are arranged side by side in the horizontal direction. Four first filling units and two second filling units are arranged inside the inner mica tape wrapping layer. The first filling unit has a first arc surface capable of abutting against the inner mica tape wrapping layer. The second filling unit has a second arc surface capable of abutting against the inner mica tape wrapping layer. Each of the first cable core and the second cable core includes an oxygen isolation layer, a glass fiber tape wrapping layer located inside the oxygen isolation layer, and a plurality of wire cores located inside the glass fiber tape wrapping layer. The wire core sequentially includes a conductor, a fire-resistant layer, and an insulating layer from inside to outside.

[0006] Further, the first filling unit has a first protrusion inserted between the first cable unit and the second cable unit.

[0007] Thereby filling the gap between the first cable unit and the second cable unit, improving the compressive performance of the cable.

[0008] Furthermore, the second filling unit has a second protrusion, and the first inner sheath has a groove portion that cooperates with the second protrusion.

[0009] Thereby filling the gap between the first cable unit and the inner mica wrapping layer, and the second filling unit is closely connected to the first cable unit.

[0010] Furthermore, the first inner sheath has two first embedding portions, and the second inner sheath has four first embedding grooves that cooperate with the first embedding portions.

[0011] Furthermore, the second inner sheath has two second embedding portions, and the first inner sheath has a second embedding groove that cooperates with the second embedding portions.

[0012] Thereby the first and second cable units are embedded and fitted together, making the internal structure of the cable compact.

[0013] Furthermore, both the first cable core and the second cable core have seven wire cores.

[0014] Thereby improving the transmission capacity and efficiency of the cable.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] 1. The control cable of the present application has an outer mica tape wrapping layer, an inner mica tape wrapping layer, a low-smoke and halogen-free flame-retardant layer, and an oxygen barrier layer, thereby having good fire resistance and flame retardancy.

[0017] 2. In the control cable of the present application, the first and second cable units are embedded and fitted together, making the internal structure of the cable compact, providing mutual support when the cable is subjected to external forces, and preventing the cable from deforming or being damaged.

[0018] 3. In the control cable of the present application, the first and second filling units increase the voltage resistance effect, thereby protecting the first and second cable units. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a control cable;

[0020] Figure 2 It is an enlarged view of area A;

[0021] Figure 3 It is a cross-sectional view of a control cable;

[0022] Figure 4 It is a schematic diagram of the separation of the internal structure of the inner mica tape wrapping layer.

[0023] Explanation of the accompanying drawings: outer sheath 1; outer mica tape wrapping layer 2; low-smoke halogen-free flame retardant layer 3; inner mica tape wrapping layer 4; first cable unit 5; first inner sheath 5.1; groove portion 5.2; first embedded portion 5.3; second embedded groove 5.4; second cable unit 6; second inner sheath 6.1; first embedded groove 6.2; second embedded portion 6.3; first filling unit 7; second filling unit 8; oxygen insulation layer 9; glass fiber tape layer 10; insulating layer 11; fire-resistant layer 12; conductor 13; first curved surface 7.1; first raised portion 7.2; second curved surface 8.1; second raised portion 8.2. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] The utility model provides Figures 1-4 The fire-resistant and flame-retardant control cable shown in the figure comprises, from the outside to the inside, an outer sheath 1, an outer mica tape wrapping layer 2, a low-smoke halogen-free flame-retardant layer 3, and an inner mica tape wrapping layer 4. Two first cable units 5 and a second cable unit 6 located between the two first cable units 5 are arranged in the inner mica tape wrapping layer 4. The first cable unit 5 includes a first inner sheath 5.1 and two first cable cores located in the first inner sheath 5.1. The two first cable cores are arranged side by side in the horizontal direction. The second cable unit 6 includes a second inner sheath 6.1 and three second cable cores located in the second inner sheath 6.1. The three second cable cores are distributed side by side in the horizontal direction. Four first filling units 7 and two second filling units 8 are arranged in the inner mica tape wrapping layer 4. The first filling unit 7 has a first curved surface 7.1 that can abut the inner mica tape wrapping layer 4. The second filling unit 8 has a second curved surface 8.1 that can abut the inner mica tape wrapping layer 4. The first cable core and the second cable core both include an oxygen insulation layer 9, a glass fiber wrapping layer 10 located in the oxygen insulation layer 9, and multiple wire cores located in the glass fiber wrapping layer 10. The wire cores include a conductor 13, a fire-resistant layer 12 and an insulating layer 11 from the inside to the outside.

[0026] The first filling unit 7 has a first protrusion 7.2 inserted between the first cable unit 5 and the second cable unit 6. The second filling unit 8 has a second protrusion 8.2, and the first inner sheath 5.1 has a groove portion 5.2 that cooperates with the second protrusion 8.2. The first inner sheath 5.1 has two first embedding portions 5.3, and the second inner sheath 6.1 has four first embedding grooves 6.2 that cooperate with the first embedding portions 5.3. The second inner sheath 6.1 has two second embedding portions 6.3, and the first inner sheath 5.1 has a second embedding groove 5.4 that cooperates with the second embedding portions 6.3. Both the first cable core and the second cable core have seven wire cores.

[0027] Working principle: The control cable of the present application has an outer mica tape wrapping layer, an inner mica tape wrapping layer, a low-smoke and halogen-free flame-retardant layer, and an oxygen barrier layer, so that the fire resistance and flame retardant effect are good. And no toxic gases and a large amount of smoke will be generated during combustion, which is conducive to the evacuation of personnel and the progress of rescue work. The first and second cable units are embedded and matched, so that the internal structure of the cable is compact, and mutual support is provided when the cable is subjected to external forces, preventing the cable from deforming or being damaged. In addition, the first and second filling units increase the voltage resistance effect of the cable, thereby protecting the first and second cable units.

[0028] During specific production, first, the first cable unit and the second cable unit are manufactured. Then, the two first cable units and the second cable unit are embedded and matched with each other. Then, the first protrusions of the four first filling units are respectively inserted into the four gaps formed between the first cable unit and the second cable unit. At the same time, the two second filling units are matched with the two first cable units. Then, an inner mica wrapping layer is prepared to wrap the first and second cable units together. Then, a low-smoke and halogen-free flame-retardant layer is prepared outside the inner mica wrapping layer, an outer mica tape wrapping layer is prepared outside the low-smoke and halogen-free flame-retardant layer, and an outer sheath is prepared outside the outer mica tape wrapping layer.

[0029] Although the present utility model has been illustrated and described with respect to the preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present utility model as long as they do not exceed the scope defined by the claims of the present utility model.

Claims

1. A fire-resistant and flame-retardant control cable, characterized in that, From outside to inside, it successively includes an outer sheath, an outer mica tape wrapping layer, a low-smoke and halogen-free flame-retardant layer, and an inner mica tape wrapping layer. Two first cable units and a second cable unit located between the two first cable units are arranged inside the inner mica tape wrapping layer. The first cable unit includes a first inner sheath and two first cable cores located inside the first inner sheath. The two first cable cores are arranged side by side in the horizontal direction. The second cable unit includes a second inner sheath and three second cable cores located inside the second inner sheath. The three second cable cores are arranged side by side in the horizontal direction. Four first filling units and two second filling units are arranged inside the inner mica tape wrapping layer. The first filling unit has a first arc surface capable of abutting against the inner mica tape wrapping layer. The second filling unit has a second arc surface capable of abutting against the inner mica tape wrapping layer. Both the first cable core and the second cable core include an oxygen isolation layer, a glass fiber tape wrapping layer located inside the oxygen isolation layer, and a plurality of wire cores located inside the glass fiber tape wrapping layer. The wire core successively includes a conductor, a fire-resistant layer, and an insulating layer from inside to outside.

2. The fire-resistant and flame-retardant control cable according to claim 1, characterized in that, The first filling unit has a first protrusion part inserted between the first cable unit and the second cable unit.

3. The fire-resistant and flame-retardant control cable according to claim 1, characterized in that, The second filling unit has a second protrusion part, and the first inner sheath has a groove part cooperating with the second protrusion part.

4. The fire-resistant and flame-retardant control cable according to claim 1, characterized in that, The first inner sheath has two first embedding parts, and the second inner sheath has four first embedding grooves cooperating with the first embedding parts.

5. The fire-resistant and flame-retardant control cable according to claim 1, characterized in that, The second inner sheath has two second embedding parts, and the first inner sheath has a second embedding groove cooperating with the second embedding parts.

6. The fire-resistant and flame-retardant control cable according to claim 1, wherein Both the first cable core and the second cable core have seven wire cores.

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