Fire-resistant high-temperature-resistant cable

Abstract

The invention discloses a fire-resistant high-temperature-resistant cable which comprises a cable body and a fire insulation layer, the cable body comprises a conductor, an inner insulation layer, a heat insulation filling layer and an outer insulation layer, the conductor is made of a conductive metal material, the inner insulation layer wraps the conductor, the heat insulation filling layer wraps the conductor, and the outer insulation layer wraps the heat insulation filling layer. The cable comprises a cable body, a heat insulation filling layer is arranged outside the cable body, an outer insulation layer is wrapped outside the heat insulation filling layer, a detachable fire insulation layer is arranged outside the cable body, the fire insulation layer comprises a sleeve made of flame-retardant aluminum foil, the sleeve is in an organ cylinder shape capable of being compressed and stretched and is inserted outside the cable body, and the fire insulation layer further comprises a supporting disc, ventilation holes and ventilation gaps. And the supporting disc is made of a flame-retardant material. By arranging the detachable fire insulation layer, flames can be isolated from the cable body, the cable body is prevented from being directly burnt, the detachable design is also convenient to replace, the cable body does not need to be replaced, and the maintenance cost is saved.

Description

Technical Field

[0001] The invention relates to a cable, in particular to a fire-resistant and high-temperature-resistant cable. Background Art

[0002] As a power transmission device, cables undertake important power transmission tasks. During their use, they often encounter various complex environments, so they are required to have certain tolerance performance, among which fire resistance and high temperature resistance are a kind of tolerance performance. Existing cables usually cannot isolate the flame from the cable body, making the insulation layer on the cable surface easily burned by the flame, which is easy to cause damage and deformation. The cable needs to be replaced as a whole later, which increases the maintenance cost and highlights the shortcomings of the existing technology. Summary of the invention

[0003] The object of the present invention is to provide a fire-resistant and high-temperature-resistant cable to solve the above-mentioned technical problems.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A fire-resistant and high-temperature resistant cable comprises a cable body and a fire-insulating layer, the cable body comprises a conductor, an inner insulating layer, a heat-insulating filling layer and an outer insulating layer, the conductor is made of a conductive metal material, the conductor is coated with the inner insulating layer, the conductor is coated with the heat-insulating filling layer, the heat-insulating filling layer is coated with the outer insulating layer, a detachable fire-insulating layer is installed outside the cable body, the fire-insulating layer comprises a sleeve made of flame-retardant aluminum foil, the sleeve is in the shape of an accordion tube that can be compressed and stretched, and is plugged outside the cable body.

[0005] On the basis of the above technical solution, the fire isolation layer also includes a support plate, ventilation holes, and a ventilation gap. The support plate is made of flame-retardant material. The outer circumference of the support plate is fixed to the inner circumference wall of the sleeve. The support plate is plugged into the outer wall of the cable body. A plurality of ventilation holes are axially penetrated through the support plate. A ventilation gap is formed between the sleeve and the cable body under the support of the support plate.

[0006] On the basis of the above technical scheme, the fire insulation layer also includes a supporting shell, a discharge port, a liquid capsule, and a puncture needle. The supporting shell is plugged into the outside of the cable body, and the front and rear ends of the supporting shell are fixed to the axial end of the sleeve. The supporting shell is an annular hollow structure, and a plurality of discharge ports are axially penetrated. A liquid capsule is fixed in the inner cavity of the supporting shell. The liquid capsule is annular and coaxial with the supporting shell. The outer circumferential wall of the liquid capsule is fixed to the outer circumferential wall of the inner cavity of the supporting shell. The liquid capsule is fully filled with water, and a plurality of puncture needles are fixed to the inner circumferential wall of the inner cavity of the supporting shell. The liquid capsule can be punctured by the puncture needles after expansion.

[0007] Compared with the prior art, the present invention has the following advantages: the present invention can isolate the flame from the cable body by providing a detachable fire-proof layer, thereby avoiding direct burning of the cable body; the detachable design can also be conveniently replaced without replacing the cable body, thus saving maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the axial side structure of the present invention.

[0009] Figure 2 This is a front view of the supporting shell and the cable body of the present invention when they are matched.

[0010] Figure 3 It is a schematic diagram of the right-side cross-section structure of the supporting shell and the liquid capsule of the present invention when they are matched.

[0011] In the figure: 1. cable body, 2. fire insulation layer, 3. conductor, 4. inner insulation layer, 5. heat insulation filling layer, 6. outer insulation layer, 7. sleeve, 8. support plate, 9. vent hole, 11. support shell, 12. discharge port, 13. liquid sac, 14. needle. DETAILED DESCRIPTION

[0012] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] like Figure 1-Figure 3 As shown, a fire-resistant and high-temperature resistant cable includes a cable body 1 and a fire-insulating layer 2, the cable body 1 includes a conductor 3, an inner insulating layer 4, a heat-insulating filling layer 5 and an outer insulating layer 6, the conductor 3 is made of a conductive metal material, the conductor 3 is coated with the inner insulating layer 4, the conductor 3 is coated with the heat-insulating filling layer 5, the heat-insulating filling layer 5 is coated with the outer insulating layer 6, a detachable fire-insulating layer 2 is installed outside the cable body 1, the fire-insulating layer 2 includes a sleeve 7 made of flame-retardant aluminum foil, the sleeve 7 is in the shape of an accordion that can be compressed and stretched, and is plugged outside the cable body 1.

[0014] The inner insulating layer 4 and the outer insulating layer 6 are made of known materials, such as halogen-free low-smoke polyolefin, and the thermal insulation filling layer 5 is a known prior art, such as asbestos. The flame-retardant aluminum foil sleeve 7 can well isolate the flame to avoid direct burning of the cable body 1, and the structure can be compressed and stretched, and can be easily plugged into the cable body 1.

[0015] The fire-insulating layer 2 also includes a support plate 8, ventilation holes 9, and a ventilation gap. The support plate 8 is made of flame-retardant material. The outer circumference of the support plate 8 is fixed to the inner circumferential wall of the sleeve 7. The support plate 8 is plugged into the outer wall of the cable body 1. A plurality of ventilation holes 9 are axially penetrated by the support plate 8. A ventilation gap is formed between the sleeve 7 and the cable body 1 under the support of the support plate 8.

[0016] The number of support plates 8 is flexibly set according to the length of the sleeve 7 to achieve a supporting effect so that the ventilation gap 10 can be used normally. By setting the ventilation gap and the vent hole 9, air can flow between the sleeve 7 and the cable body 1, and when the flame burns the sleeve 7, hot air will not continue to accumulate in one place, causing local excessive high temperature and causing damage to the cable body 1.

[0017] The fire-insulating layer 2 also includes a supporting shell 11, a discharge port 12, a liquid capsule 13, and a puncture needle 14. The supporting shell 11 is plugged into the outside of the cable body 1. The front and rear ends of the supporting shell 11 are fixed to the axial end of the sleeve 7. The supporting shell 11 is an annular hollow structure, and a plurality of discharge ports 12 are axially penetrated. A liquid capsule 13 is fixed in the inner cavity of the supporting shell 11. The liquid capsule 13 is annular and coaxial with the supporting shell 11. The outer circumferential wall of the liquid capsule 13 is fixed to the outer circumferential wall of the inner cavity of the supporting shell 11. The liquid capsule 13 is fully filled with water. A plurality of puncture needles 14 are fixed to the inner circumferential wall of the inner cavity of the supporting shell 11. The liquid capsule 13 can be punctured by the puncture needles 14 after expansion.

[0018] The number of the supporting shells 11 is flexibly set according to the length of the cable body 1. When the flame burns the supporting shell 11, the water in the liquid capsule 13 is heated to continuously generate water vapor, so that the liquid capsule 13 gradually expands and is punctured by the needle 14. Subsequently, the mixture of water and water vapor is discharged through the punctured holes, and then dissipated into the ventilation gap through the discharge port 12 and the vent 9, thereby spraying onto the inner surface of the sleeve 7, thereby absorbing the heat of the sleeve 7 and achieving a cooling effect. The heat of the sleeve 7 causes the water therein to further evaporate and be discharged from both axial ends.

[0019] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A fire-resistant and high-temperature resistant cable, comprising a cable body (1) and a fire-insulating layer (2), wherein the cable body (1) comprises a conductor (3), an inner insulating layer (4), a heat-insulating filling layer (5) and an outer insulating layer (6), wherein the conductor (3) is made of a conductive metal material, the conductor (3) is coated with the inner insulating layer (4), the conductor (3) is coated with the heat-insulating filling layer (5), the heat-insulating filling layer (5) is coated with the outer insulating layer (6), and a detachable fire-insulating layer (2) is installed on the outside of the cable body (1), characterized in that: The fire-insulating layer (2) comprises a sleeve (7) made of flame-retardant aluminum foil, the sleeve (7) being in the shape of an organ tube capable of compression and expansion, and being plugged onto the outside of the cable body (1).

2. A fire-resistant and high-temperature resistant cable according to claim 1, characterized in that: The fire-insulating layer (2) further comprises a support plate (8), ventilation holes (9), and a ventilation gap. The support plate (8) is made of a flame-retardant material. The outer circumference of the support plate (8) is fixed to the inner circumferential wall of the sleeve (7). The support plate (8) is plugged into the outer wall of the cable body (1). The support plate (8) is axially penetrated by a plurality of ventilation holes (9). Under the support of the support plate (8), a ventilation gap is formed between the sleeve (7) and the cable body (1).

3. A fire-resistant and high-temperature resistant cable according to claim 2, characterized in that: The fire-proof layer (2) comprises a supporting shell (11), a discharge port (12), a liquid capsule (13), and a puncture needle (14). The supporting shell (11) is plugged into the outside of the cable body (1). The front and rear ends of the supporting shell (11) are fixed to the axial end of the sleeve (7). The supporting shell (11) is an annular hollow structure and has a plurality of discharge ports (12) axially extending therethrough. A liquid capsule (13) is fixed in the inner cavity of the supporting shell (11). The liquid capsule (13) is annular and coaxial with the supporting shell (11). The outer circumferential wall of the liquid capsule (13) is fixed to the outer circumferential wall of the inner cavity of the supporting shell (11). The liquid capsule (13) is fully filled with water. A plurality of puncture needles (14) are fixed to the inner circumferential wall of the inner cavity of the supporting shell (11). The liquid capsule (13) can be punctured by the puncture needles (14) after expansion.

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