Flame-retardant heat-absorbing fire-resistant cable

Abstract

The utility model discloses a flame-retardant heat absorption type fire-resistant cable, which comprises electric wires, flame-retardant filling ropes, an outer flame-retardant wrapping tape, a neck bush, an armor tape, an inner sheath, a heat absorption tape and an outer sheath, a plurality of the electric wires and the flame-retardant filling ropes are twisted together to form a cable core, the outer flame-retardant wrapping tape is wound outside the cable core, and the outer flame-retardant wrapping tape is wound outside the neck bush. The inner lining is wrapped outside the outer flame-retardant wrapping tape in an extruded mode, the armoring tape is wound outside the inner lining, the inner sheath is wrapped outside the armoring tape in an extruded mode, the heat absorption tape is wound outside the inner sheath, the outer sheath is wrapped outside the heat absorption tape in an extruded mode, and the outer sheath is wrapped outside the outer flame-retardant wrapping tape in an extruded mode. And the working time of the cable in a fire disaster can be prolonged from the two aspects of flame retardance and heat absorptivity.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, especially the technical field of fire-resistant cables.

Background Art

[0002] With the continuous improvement of people's safety protection awareness, the requirements for the fire resistance of cables have also been gradually increased. In order to reduce the loss of life and property caused by fires in buildings, some basic circuits are required to be able to continue operating for at least 15 minutes during a fire, and in some cases, they are even required to be able to continue operating for three or four hours, such as the alarm devices of the electrical system (the alarm devices are very important for whether other systems such as the telephone system, lighting system, elevator system, ventilation system, fire pump, and smoke detector can continue operating).

[0003] A fire-resistant cable refers to a cable that can maintain safe operation for a certain period of time under the condition of flame combustion, and is widely used in places related to fire safety and fire fighting and rescue, such as high-rise buildings, subways, underground streets, large power stations, and important industrial and mining enterprises. Existing fire-resistant cables usually extend the signal transmission time by adding multiple layers of fire-resistant structures that are difficult to ignite inside, such as the high-flame-retardant fire-resistant medium-voltage power cable with the publication number of CN205582599U, a flame-retardant fire-resistant power cable with the publication number of CN115036073B, and a new type of fire-resistant and flame-retardant cable with the publication number of CN117727502A. However, considering only from the aspect of flame retardancy has certain limitations. This is because the cable will still affect the signal transmission stability due to overheating (in a high-temperature environment, the electromagnetic noise generated by the cable will increase, and the signal-to-noise ratio of the cable will decrease, resulting in problems such as an increase in the error rate and packet loss rate).

Content of the Utility Model

[0004] The purpose of the utility model is to solve the problems in the prior art, and propose a flame-retardant and heat-absorbing fire-resistant cable, which can extend the working time of the cable in a fire from two aspects of flame retardancy and heat absorption.

[0005] To achieve the above purpose, the utility model proposes a flame-retardant and heat-absorbing fire-resistant cable, which includes wires, flame-retardant filling ropes, outer flame-retardant wrapping tapes, inner liners, armor tapes, inner sheaths, heat-absorbing tapes, and outer sheaths. Several of the said wires and flame-retardant filling ropes are twisted together to form a cable core jointly. The outer flame-retardant wrapping tapes are wound outside the cable core. The inner liners are extruded and coated outside the outer flame-retardant wrapping tapes. The armor tapes are wound outside the inner liners. The inner sheaths are extruded and coated outside the armor tapes. The heat-absorbing tapes are wound outside the inner sheaths. The outer sheaths are extruded and coated outside the heat-absorbing tapes.

[0006] Preferably, the wire includes a conducting wire, an inner flame-retardant wrapping tape, and an insulating sleeve. The inner flame-retardant wrapping tape is wound around the conducting wire, and the insulating sleeve is extruded and coated outside the inner flame-retardant wrapping tape.

[0007] Preferably, the conducting wire is a copper wire, both the inner flame-retardant wrapping tape and the outer flame-retardant wrapping tape are mica tapes, and both the insulating sleeve and the inner lining sleeve are cross-linked polyethylene sleeves.

[0008] Preferably, the flame-retardant filling rope is a glass fiber rope.

[0009] Preferably, the armor tape is a steel tape.

[0010] Preferably, both the inner sheath and the outer sheath are low-smoke, halogen-free, flame-retardant polyolefin sleeves.

[0011] Preferably, an inner water barrier layer is further provided between the inner sheath and the heat-absorbing tape, and an outer water barrier layer is further provided between the outer sheath and the heat-absorbing tape.

[0012] Preferably, both the inner water barrier layer and the outer water barrier layer are formed by winding a polyester non-woven fabric water-blocking tape.

[0013] Preferably, the heat-absorbing tape is a rubber tape with a plurality of cavities respectively arranged along the length direction, and water is filled in the cavities.

[0014] Preferably, the cavities are not communicated with each other.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1) By adding an inner flame-retardant wrapping tape between the conducting wire and the insulating sleeve of each wire to form an inner-layer flame-retardant protection, using a flame-retardant filling rope to separate and fill each wire to form a middle-layer flame-retardant protection, and winding an outer flame-retardant wrapping tape outside the cable core formed by twisting a plurality of wires and the flame-retardant filling rope to form an outer-layer flame-retardant protection, the inner, middle, and outer three-layer flame-retardant design can be used to effectively prevent the fire from spreading inward along the cable, and finally extend the normal working time of the cable;

[0017] 2) By adding a heat-absorbing tape with cavities outside the cable, and using an inner sheath and an outer sheath to provide double protection for the heat-absorbing tape on both the inner and outer sides, the water in the cavities can be used to absorb heat, effectively delaying the heating rate of the cable in a high-temperature environment and improving the communication quality of the cable;

[0018] 3) By making the cavities not communicate with each other when there are multiple cavities, and adding a water-blocking structure on both the inner and outer sides of the heat-absorbing tape, the water leakage amount can be reduced to a certain extent and the adverse effect of water seepage on the normal operation of the cable can be avoided.

[0019] The features and advantages of the present utility model will be described in detail through embodiments in conjunction with the accompanying drawings.

Explanation of the Drawings

[0020] Figure 1 is a cross-sectional view of the first embodiment;

[0021] Figure 2 is a cross-sectional view of the first embodiment when the inner water barrier layer, heat absorption belt, outer water barrier layer, and outer sheath are removed;

[0022] Figure 3 is a cross-sectional view of the electric wire of the first embodiment;

[0023] Figure 4 is a cross-sectional view of the heat absorption belt of the first embodiment;

[0024] Figure 5 is a cross-sectional view of the heat belt of the second embodiment.

[0025] In the figure: 1 - electric wire, 101 - wire, 102 - inner flame-retardant wrapping tape, 103 - insulating sleeve, 2 - flame-retardant filling rope, 3 - outer flame-retardant wrapping tape, 4 - inner lining sleeve, 5 - armor tape, 6 - inner sheath, 7 - heat absorption belt, 701 - cavity, 8 - outer sheath, 9 - inner water barrier layer, 10 - outer water barrier layer.

Specific Embodiments

[0026] The first embodiment:

[0027] Referring to Figures 1 to 4 , the flame-retardant heat-absorbing fire-resistant cable of the present utility model includes an electric wire 1, a flame-retardant filling rope 2, an outer flame-retardant wrapping tape 3, an inner lining sleeve 4, an armor tape 5, an inner sheath 6, a heat absorption belt 7, and an outer sheath 8. A plurality of the electric wires 1 and the flame-retardant filling ropes 2 are twisted together to form a cable core. The outer flame-retardant wrapping tape 3 is wound outside the cable core. The inner lining sleeve 4 is extruded and coated outside the outer flame-retardant wrapping tape 3. The armor tape 5 is wound outside the inner lining sleeve 4. The inner sheath 6 is extruded and coated outside the armor tape 5. The heat absorption belt 7 is wound outside the inner sheath 6. The outer sheath 8 is extruded and coated outside the heat absorption belt 7.

[0028] The electric wire 1 includes a wire 101, an inner flame-retardant wrapping tape 102, and an insulating sleeve 103. The inner flame-retardant wrapping tape 102 is wound outside the wire 101. The insulating sleeve 103 is extruded and coated outside the inner flame-retardant wrapping tape 102.

[0029] The wire 101 is a copper wire. The inner flame-retardant wrapping tape 102 and the outer flame-retardant wrapping tape 3 are both mica tapes. The insulating sleeve 103 and the inner lining sleeve 4 are both cross-linked polyethylene sleeves.

[0030] The flame-retardant filling rope 2 is a glass fiber rope.

[0031] The armored tape 5 is a steel tape.

[0032] Both the inner sheath 6 and the outer sheath 8 are low-smoke and halogen-free flame-retardant polyolefin sheaths.

[0033] An inner water barrier layer 9 is further provided between the inner sheath 6 and the heat absorption tape 7, and an outer water barrier layer 10 is further provided between the outer sheath 8 and the heat absorption tape 7.

[0034] Both the inner water barrier layer 9 and the outer water barrier layer 10 are formed by winding a polyester non-woven water blocking tape.

[0035] The heat absorption tape 7 is a rubber tape with a cavity 701 provided along the length direction respectively, and water is filled in the cavity 701.

[0036] Embodiment 2:

[0037] Refer to Figure 5 , the number of the cavities 701 is at least two and they are not communicated with each other.

[0038] Others are the same as those in Embodiment 1.

[0039] The above embodiments are descriptions of the present invention, not limitations on the present invention. Any scheme obtained by simply changing the present invention belongs to the protection scope of the present invention.

Claims

1. Flame retardant heat-absorbing fire-resistant cable, characterized by: The cable comprises an electric wire (1), a flame retardant filling rope (2), an outer flame retardant wrapping tape (3), an inner lining (4), an armor tape (5), an inner sheath (6), an absorption heat tape (7) and an outer sheath (8); a plurality of the electric wires (1) and the flame retardant filling ropes (2) are twisted together to form a cable core; the outer flame retardant wrapping tape (3) is wound around the cable core; the inner lining (4) is extruded and coated around the outer flame retardant wrapping tape (3); the armor tape (5) is wound around the inner lining (4); the inner sheath (6) is extruded and coated around the armor tape (5); the absorption heat tape (7) is wound around the inner sheath (6); and the outer sheath (8) is extruded and coated around the absorption heat tape (7).

2. The flame-retardant, heat-absorbing, fire-resistant cable according to claim 1, characterized in that: The electric wire (1) comprises a guide wire (101), an inner flame retardant wrapping tape (102) and an insulating sleeve (103), wherein the inner flame retardant wrapping tape (102) is wound around the guide wire (101), and the insulating sleeve (103) is extruded and wrapped around the inner flame retardant wrapping tape (102).

3. The flame retardant, heat-absorbing, fire-resistant cable according to claim 2, characterized in that: The guide wire (101) is a copper wire, the inner flame retardant wrapping tape (102) and the outer flame retardant wrapping tape (3) are both mica tapes, and the insulating sleeve (103) and the inner liner sleeve (4) are both cross-linked polyethylene sleeves.

4. The flame-retardant, heat-absorbing, fire-resistant cable according to claim 1, characterized in that: The flame retardant filling rope (2) is a glass fiber rope.

5. The flame retardant, heat-absorbing, fire-resistant cable according to claim 1, characterized in that: The armor belt (5) is a steel belt.

6. The flame retardant, heat-absorbing, fire-resistant cable according to claim 1, characterized in that: The inner sheath (6) and the outer sheath (8) are both low-smoke, halogen-free, flame-retardant polyolefin sheaths.

7. The flame retardant, heat-absorbing, fire-resistant cable according to claim 1, characterized in that: An inner waterproof layer (9) is provided between the inner jacket (6) and the heat absorption zone (7), and an outer waterproof layer (10) is provided between the outer jacket (8) and the heat absorption zone (7).

8. The flame retardant, heat-absorbing, fire-resistant cable according to claim 7, characterized in that: The inner water-proof layer (9) and the outer water-proof layer (10) are both formed by winding a polyester non-woven water-blocking tape.

9. The flame-retardant, heat-absorbing, fire-resistant cable according to any one of claims 1 to 8, characterized in that: The heat absorption belt (7) is a rubber belt with a plurality of cavities (701) respectively arranged along the length direction, and the cavities (701) are filled with water.

10. The flame-retardant, heat-absorbing, fire-resistant cable according to claim 9, characterized in that: The cavities (701) are not connected to each other.

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