Environment-friendly waterproof compression-resistant high-temperature-resistant fireproof cable

Abstract

The utility model discloses an environment-friendly waterproof compression-resistant high-temperature-resistant fireproof cable, which comprises a cable core, and the cable core is formed by combining a plurality of insulating wire cores with the same number and hollow PE fan-shaped filling strips. An anti-aging rubber hose is arranged outside the cable core; the anti-aging rubber hose is coated with a ceramic aerogel fireproof thermal insulation layer; the ceramic aerogel fireproof heat insulation layer is wrapped by a buffer layer formed by a PETD wrapping tape; an embossed corrosion-resistant stainless steel metal sleeve is longitudinally wrapped and welded outside the buffer layer to form a metal protective layer; and an environment-friendly halogen-free low-smoke flame-retardant polyolefin outer sheath is extruded outside the metal protection layer. The cable has excellent fireproof performance, compression resistance, waterproof performance, corrosion resistance and the like at the same time, normal operation of a line can be ensured after long-time high-temperature flame burning, and the service life of the cable is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the field of power cables, in particular to an environmentally friendly, waterproof, pressure-resistant, high-temperature-resistant and fire-proof cable. Background Art

[0002] In recent years, with the rapid development of my country's economy, the construction scale of subways, hospitals, schools, high-rise buildings, etc. has continued to expand, the number has increased sharply, and the urban electricity consumption has continued to rise. Cables used in fire protection systems in such densely populated key areas are required to use fire-resistant cables.

[0003] At present, fireproof cables generally only guarantee normal operation of the line under the conditions of fire supply temperature of 950~1000℃ and fire supply time of 3h. In actual fire, the flame temperature is higher and the duration is longer. In addition, during the fire or fire extinguishing process, the cable may be hit by foreign objects and water may penetrate, causing it to short-circuit.

[0004] The commonly used structural conductor in the existing fireproof cable is a copper conductor, and the insulation is wrapped with mica tape. The mica tape absorbs moisture, which affects the insulation resistance and produces oxidation corrosion on the copper conductor, affecting the electrical performance; and the existing high-temperature fire-resistant mica tape is generally divided into single-sided and double-sided structures, which generally only contains a glass cloth layer, a viscose layer and mica paper; the mica tape has high temperature resistance and fire resistance when in use, but does not have a moisture-proof function; in the event of a fire, the flame will destroy the insulation layer outside the cable, and the high-temperature resistance of the mica tape postpones the time of overall damage to the cable. However, if it encounters fire water or rain spray at this time, the mica tape loses its own characteristics after being damp, and the cable is damaged and cannot be used reliably. Therefore, the use of existing fireproof cables will cause hidden dangers to the normal operation of the fire protection system, and bring risks to the protection of building equipment and the evacuation of personnel. Therefore, it is necessary to develop an environmentally friendly high-temperature fireproof cable that can withstand high-temperature flames for a long time to ensure the normal operation of the line and is waterproof and pressure-resistant. Utility Model Content

[0005] In order to overcome the deficiencies in the prior art, the utility model provides an environmentally friendly, waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable, which has excellent fire-proofing, pressure-resistant, waterproofing and corrosion-resistant properties, can ensure the normal operation of the line under long-term high-temperature flame burning, and greatly improves the service life of the cable.

[0006] To achieve the above-mentioned purpose, the utility model provides an environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-proof cable, comprising a cable core, wherein the cable core is composed of a plurality of insulating cores of the same number and a hollow PE fan-shaped filling strip; an anti-aging rubber hose is arranged outside the cable core; the anti-aging rubber hose is coated with a ceramic aerogel fireproof and heat-insulating layer; the ceramic aerogel fireproof and heat-insulating layer is wrapped with a buffer layer composed of a PETD wrapping tape; the buffer layer is longitudinally wrapped with a welded corrugated corrosion-resistant stainless steel metal sheath to form a metal protective layer; the metal protective layer is extruded with an environmentally friendly halogen-free, low-smoke, flame-retardant polyolefin outer sheath.

[0007] Furthermore, the number of the insulating cores is 4, which are symmetrically distributed in pairs up and down, and a heat dissipation cavity is formed in the middle of the 4 insulating cores after they are tightly fitted.

[0008] Furthermore, the number of the PE fan-shaped filling strips is 4, and they are fitted to the outer edges of two adjacent insulating cores in the top, bottom, left and right directions.

[0009] Furthermore, the length of the arc edge of the PE fan-shaped filling strip that is bonded to the insulating core is 1 / 3 of the circumference of the insulating core.

[0010] Furthermore, the insulated wire core comprises a conductor, and the conductor is wrapped with a PTFE tetrafluoroethylene film tape and then a silicone rubber insulation layer is extruded outside the PTFE tetrafluoroethylene film tape.

[0011] Furthermore, the conductor is the first or second annealed copper conductor, aluminum or aluminum alloy conductor.

[0012] Furthermore, the anti-aging rubber hose comprises a polytetrafluoroethylene hose, an inner anti-aging coating is arranged on the inner side of the polytetrafluoroethylene hose, an outer anti-aging coating is arranged on the outer side of the polytetrafluoroethylene hose, and an anti-pressure layer is arranged on the outer side of the outer anti-aging coating.

[0013] Furthermore, the inner anti-aging coating is a silicon carbide wear-resistant coating.

[0014] Furthermore, the outer anti-aging coating is a phenolic epoxy resin composite coating.

[0015] Furthermore, the compression-resistant layer is a steel wire braided layer.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The double-layer insulation structure adopted in the wire core of the utility model can effectively prevent moisture penetration, improve the electrical insulation performance of the cable, ensure the safe use and reliability of the cable, and the long-term maximum allowable normal operating temperature of the cable can be increased to 180°C, thereby increasing the current carrying capacity and not causing oxidation corrosion to the copper conductor. This solves the problem that the normal allowable maximum operating temperature of the existing fireproof cable is 90°C, the conductors are all copper conductors, and the insulation is wrapped with mica tape. The mica tape absorbs moisture, which affects the reduction of insulation resistance, and causes oxidation corrosion to the copper conductor, thus affecting the electrical performance.

[0018] 2. The PE fan-shaped filling strips in the utility model are fitted with the outer edges of two adjacent insulating cores from top to bottom and left to right. First, they can fix the insulating cores well and prevent them from loosening. Second, they make the cable cores more rounded and support the entire cable core. When the insulating cores are closely fitted, a heat dissipation cavity is formed in the middle. Combined with the hollow structure of the PE fan-shaped filling strips, the heat generated by the cable during operation is greatly improved.

[0019] 3. In the utility model, an anti-aging rubber hose is arranged outside the cable core, so as to better protect the cable core.

[0020] 4. The utility model adopts a ceramic aerogel fireproof insulation layer, which has excellent thermal insulation and fireproof performance, a thermal conductivity of less than 0.019W (m·k), a maximum operating temperature of 2300°C, and can effectively resist the burning of flames and temperature transfer. The fireproof performance is significantly better than that of existing fireproof cables. It is ultra-light, fire-resistant, corrosion-resistant, and high-temperature resistant.

[0021] 5. The buffer layer composed of PETD wrapping tape in the overlapping wrapping of the utility model replaces the inner protective layer, which can prevent the steel thorns on the edge of the stainless steel from penetrating into the interior. It is environmentally friendly and meets the ROHS standard. It is resistant to high temperature (melting point is 260℃), has strong insulation (8KV will not be punctured within 5 minutes), and is waterproof.

[0022] 6. The metal protective layer of the utility model adopts a longitudinally welded corrugated corrosion-resistant stainless steel metal sheath. The melting point of stainless steel is about 1400°C, which can effectively prevent the flame from burning the cable core, and the corrugation can effectively improve the bending performance and physical and mechanical compressive resistance of the cable. The sealing welding can effectively improve the waterproof performance of the cable, avoiding the cable from being short-circuited by foreign objects and water penetration during the fire or fire extinguishing process, thereby ensuring the long-term safe use and reliability of the cable.

[0023] 7. The outer sheath of the utility model adopts environmentally friendly anti-drip, low calorific value, halogen-free, low-smoke, flame-retardant polyolefin sheath material with an oxygen index of ≥36. The material has excellent crusting, no dripping of combustibles in a short time, low heat release rate and total amount, and has excellent flame retardant properties.

[0024] In summary, the utility model has excellent fire resistance, pressure resistance, waterproof performance, etc., and is equipped with an anti-aging rubber hose, a ceramic aerogel fireproof insulation layer, a buffer layer composed of a PETD wrapping tape, and a metal protective layer from the inside to the outside. The multi-layer fireproof structure is combined to ensure that the cable can ensure the normal operation of the line when burned by high-temperature flames for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] Figure 2 It is a schematic structural diagram of the anti-aging rubber hose of the utility model. DETAILED DESCRIPTION

[0027] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0028] like Figure 1 As shown, the utility model provides an environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable, comprising a cable core, which is composed of a plurality of insulating wire cores of the same number and a hollow PE fan-shaped filling strip 4;

[0029] It should be noted here that: the number of insulated cores is 4, which are symmetrically distributed in pairs, and the 4 insulated cores are closely fitted to form a heat dissipation cavity in the middle, which, combined with the hollow structure of the PE fan-shaped filling strip, greatly improves the heat dissipation generated by the cable when it is working; the number of PE fan-shaped filling strips is 4, which fit the outer edges of the two adjacent insulated cores in the top, bottom, left and right directions, which can fix the insulated core well and prevent it from loosening; secondly, it makes the cable core more round and supports the entire cable core;

[0030] In addition, the length of the two arc edges where the PE fan-shaped filling strip fits the insulating core is 1 / 3 of the circumference of the fireproof insulating core, which can better fit the insulating core.

[0031] In this embodiment, the insulated wire core includes a conductor 1, a PTFE tetrafluoro film tape 2 is wrapped around the outside of the conductor as a first insulating layer, and then a silicone rubber insulation layer 3 is extruded outside the PTFE tetrafluoro film tape as a second insulating layer; wherein the conductor adopts the first or second annealed copper conductor, aluminum or aluminum alloy conductor, compared with the existing fire-proof cable that can only use a copper core, the cost is reduced and the economic benefit is obvious; the PTFE tetrafluoro film tape has high and low temperature resistance, corrosion resistance, wear resistance, moisture resistance, high insulation, good flexibility, and a small thermal expansion coefficient, while the silicone rubber has good temperature resistance (-55~180℃ can work normally for a long time), has excellent insulation, corona resistance, arc resistance, aging resistance, and good waterproof, oil resistance, and solvent resistance; the double-layer insulation structure can effectively prevent moisture penetration, improve the electrical insulation performance of the cable, ensure the safe use and reliability of the cable, so that the long-term maximum allowable normal working temperature of the cable can be increased to 180℃.

[0032] In this embodiment, an anti-aging rubber hose 5 is provided outside the cable core. The inner diameter of the anti-aging rubber hose 5 is equal to the outer diameter of the circle formed by the four PE fan-shaped filling strips, which can better wrap the PE fan-shaped filling strips and make the cable core tighter.

[0033] In this embodiment, the ceramic aerogel fireproof and heat-insulating layer 6 is coated on the outside of the anti-aging rubber hose 5, which has excellent heat-insulating and fire-proof performance, a thermal conductivity of less than 0.019W (m·k), a maximum operating temperature of up to 2300°C, and can effectively resist the burning of flames and temperature transfer. The fireproof performance is significantly better than that of existing fireproof cables. It is ultra-light, fire-resistant, corrosion-resistant, and high-temperature resistant; the ceramic aerogel fireproof and heat-insulating layer 6 is overlapped with a buffer layer 7 composed of a PETD wrapping tape, which replaces the inner protective layer. It is made of a high-temperature resistant sponge and a PET film, which can prevent the edge of stainless steel from penetrating into the interior, is environmentally friendly and meets ROHS standards, and is resistant to high temperatures (melting point is 260°C), has strong insulation (8KV will not be punctured within 5 minutes), and is waterproof; the buffer layer is longitudinally wrapped outside The welded corrugated corrosion-resistant stainless steel metal sheath constitutes the metal protective layer 8. The melting point of stainless steel is about 1400°C, which can effectively prevent the flame from burning the cable core, and the corrugation can effectively improve the bending performance and physical and mechanical compressive resistance of the cable. The sealed welding can effectively improve the waterproof performance of the cable to avoid the cable being short-circuited by foreign objects or water penetration during the fire or fire extinguishing process, thereby ensuring the long-term safe use and reliability of the cable. Finally, the metal protective layer is extruded with an environmentally friendly halogen-free, low-smoke, flame-retardant polyolefin outer sheath 9, which adopts an environmentally friendly, anti-drip, low-calorific value halogen-free, low-smoke, flame-retardant polyolefin sheath material with an oxygen index ≥36. The material has excellent crusting, no dripping of combustibles in a short time, low heat release rate and total amount, and has excellent flame retardant properties.

[0034] In this embodiment, further optimization is performed, such as Figure 2As shown, the anti-aging rubber hose 5 includes a polytetrafluoroethylene hose 51 , an inner anti-aging coating 52 is provided on the inner side of the polytetrafluoroethylene hose 51 , an outer anti-aging coating 53 is provided on the outer side of the polytetrafluoroethylene hose, and an anti-pressure layer 54 is provided on the outer side of the outer anti-aging coating.

[0035] It should be noted here that: the inner anti-aging coating 52 is a silicon carbide wear-resistant coating, which has ultra-high density, ultra-strong hardness and ultra-strong bonding composite strength, so that the interior of the anti-aging rubber hose 5 has super corrosion resistance and wear resistance; the outer anti-aging coating 53 is a phenolic epoxy resin coating, which makes the anti-aging rubber hose 5 have good corrosion resistance, chemical resistance, heat resistance, wear resistance, high flexural strength, and is not easy to break when bent, even if the bending angle is large, it will not break; the pressure-resistant layer 54 is a steel wire braided layer, which can withstand longitudinal tensile force, play a mechanical protection role, and can also eliminate the shielding effect of the surface potential of the power cable and the shielding effect of electromagnetic interference.

[0036] To sum up, through the above design, the utility model has excellent fire resistance, pressure resistance and waterproof performance, and can ensure the normal operation of the line under long-term high-temperature flame burning, greatly improving the service life of the cable.

[0037] The utility model has many specific application paths. The above is only the preferred implementation mode of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the utility model. These improvements should also be regarded as the protection scope of the utility model.

Claims

1. An environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable, characterized by: It comprises a cable core, which is composed of a plurality of insulating cores of the same number and a hollow PE fan-shaped filling strip; an anti-aging rubber hose is arranged outside the cable core; the anti-aging rubber hose is covered with a ceramic aerogel fireproof and heat-insulating layer; the ceramic aerogel fireproof and heat-insulating layer is wrapped with a buffer layer composed of a PETD wrapping tape; the buffer layer is longitudinally wrapped with a welded corrugated corrosion-resistant stainless steel metal sheath to form a metal protective layer; the metal protective layer is extruded with an environmentally friendly halogen-free, low-smoke, flame-retardant polyolefin outer sheath.

2. The environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable according to claim 1, characterized in that: The number of the insulating wire cores is 4, which are symmetrically distributed in pairs up and down, and a heat dissipation cavity is formed in the middle of the 4 insulating wire cores after they are tightly fitted.

3. The environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable according to claim 2, characterized in that: The number of the PE fan-shaped filling strips is 4, and they are fitted with the outer edges of two adjacent insulating wire cores in the upper, lower, left and right directions.

4. The environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable according to claim 3 is characterized by: The length of the arc edge of the PE fan-shaped filling strip that fits the insulating core is 1 / 3 of the circumference of the insulating core.

5. The environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable according to claim 1, characterized in that: The insulated wire core comprises a conductor, and the conductor is wrapped with a PTFE tetrafluoro film tape and then a silicone rubber insulating layer is extruded outside the PTFE tetrafluoro film tape.

6. The environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable according to claim 5, characterized in that: The conductor is the first or second annealed copper conductor, aluminum or aluminum alloy conductor.

7. The environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable according to claim 1, characterized in that: The anti-aging rubber hose comprises a polytetrafluoroethylene hose, the inner side of which is provided with an inner anti-aging coating, the outer side of which is provided with an outer anti-aging coating, and the outer side of which is provided with an anti-pressure layer.

8. The environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable according to claim 7, characterized in that: The inner anti-aging coating is a silicon carbide wear-resistant coating.

9. The environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable according to claim 7, characterized in that: The external anti-aging coating is a phenolic epoxy resin composite coating.

10. The environmentally friendly waterproof, pressure-resistant, high-temperature-resistant and fire-resistant cable according to claim 7, characterized in that: The compression-resistant layer is a steel wire braided layer.

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