Active fire extinguishing type cable

Abstract

The utility model discloses an active fire extinguishing type cable, which relates to the field of cables, aims to solve the problem that a cable in the prior art can only passively prevent fire and cannot effectively, quickly and actively extinguish fire, and adopts the technical scheme that the active fire extinguishing type cable comprises a main cable core, the main cable core comprises a wire core and a flame-retardant filling layer, and the wire core comprises a conductor; a fireproof layer, a fireproof layer and an insulation isolation layer are arranged outside the conductor; a flame-retardant filling layer is arranged outside the wire cores, a flame-retardant belt and an inner sheath are arranged outside the main cable core, an outer sheath is arranged outside the inner sheath, an annular one-way valve is arranged between the inner sheath and the outer sheath, the one-way valve divides a cavity between the inner sheath and the outer sheath, and the cavity is filled with non-combustible and non-combustion-supporting gas. The gas can be quickly released and can quickly spread in a path superior to that of the fire extinguishing agent, the flame is suffocated after the ignition point is covered, the fire extinguishing effect is better, and the covering area is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to an active fire extinguishing cable. Background Art

[0002] Currently, fires caused by electrical sources account for the majority of all fires. When a building fire occurs, conventional cables passively burn or are passively flame-retardant and fire-resistant. Regardless of their flame retardancy or fire resistance, no cable can actively extinguish or reduce the intensity of a fire. Therefore, there is an urgent need for cables that can actively extinguish or reduce the intensity of electrical fires in their early stages, thereby saving lives and minimizing fire losses.

[0003] The performance of existing cables in electrical fires is disappointing. They do their best to prevent combustion and smoke generation. Even the most flame-retardant cables cannot proactively extinguish fires in their early stages. This has become a major pain point for firefighting and urgently needs to be addressed.

[0004] Chinese patent CN208400524U discloses a high-temperature resistant enameled copper round wire for power transmission and distribution equipment. The technical solution adopted is as follows: it includes a first copper wire, a second copper wire, a third copper wire, an optical fiber cable, a protective device, and a repair device. The protective device is provided on the upper side of the first copper wire, the second copper wire is provided on the upper side of the protective device, the repair device is provided on one side of the protective device, the third copper wire is provided on one side of the repair device, and the optical fiber cable is provided on the lower side of the second copper wire. The protective device includes a plastic coating, a first tensile nylon rope, a second tensile nylon rope, a third tensile nylon rope, a fire extinguishing agent storage layer, a fire extinguishing agent, a fire retardant coating, an insulating coating, and a cable support frame. Although the existing patent has a built-in fire extinguishing agent and can extinguish a fire by releasing the fire extinguishing agent when a fire occurs, the spray direction of the fire extinguishing agent is fixed and it must be attached to the fire source to achieve the fire extinguishing effect. In actual use, the fire extinguishing effect is limited, and the release of all the fire extinguishing agent will result in high costs for subsequent repair and replenishment. Utility Model Content

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide an active fire extinguishing cable, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model discloses an active fire extinguishing cable, which adopts the technical solution of comprising a main cable core, wherein the main cable core comprises a wire core and a flame retardant filling layer, the wire core comprises a conductor, and the conductor is provided with a fire-resistant layer, a fireproof layer and an insulating isolation layer; the flame retardant filling layer is filled on the outside of the wire core to ensure the roundness of the cable core while playing a passive fire prevention effect; the main cable core is provided with a flame retardant tape and an inner sheath outside, the inner sheath is provided with an outer sheath outside, and an annular one-way valve is provided between the inner sheath and the outer sheath, and the one-way valve separates a cavity between the inner sheath and the outer sheath, and the cavity is filled with non-flammable, non-combustible gas. When the flame damages the outer sheath of the cable, the gas will overflow and suffocate the flame, thereby achieving the effect of active fire extinguishing.

[0007] As a preferred technical solution of the present invention, the conductor is an annealed copper wire stranded conductor.

[0008] As a preferred technical solution of the present invention, the fire-resistant layer is a mica tape with 2 to 3 layers.

[0009] As a preferred technical solution of the present invention, the fireproof layer is a ceramic glass fiber tape with 2 to 3 layers.

[0010] As a preferred technical solution of the present invention, the insulating isolation layer is a radiation cross-linked polyethylene layer. Radiation cross-linked polyethylene is a cross-linked polyethylene extruded by an extruder that is irradiated with a high-energy electron beam or ultraviolet light to transform the polymer from a linear structure into a three-dimensional network structure.

[0011] As a preferred technical solution of the present invention, the flame-retardant filling layer is flame-retardant glass fiber; the flame-retardant tape is glass fiber tape; the inner sheath is a polytetrafluoroethylene sheath; and the outer sheath is an irradiated low-smoke halogen-free polyolefin sheath.

[0012] As a preferred technical solution of the present invention, the main body of the one-way valve is an annular valve body, with a through-hole formed on its end face. A flared hole is formed in the middle of the flared hole, and the sidewall of the flared hole on one side communicates with the valve body end face on the other side through a vent hole. A valve core is slidably connected within the flared hole, and the valve core has an edge plate that slides within the flared hole. A spring is press-fitted between the edge plate and the end face of the flared hole. If a fire damages the outer layer of the cable, only the non-flammable, non-combustible gas at the damaged end of the cable is released to extinguish the fire, ensuring effective fire extinguishing while reducing the cost of subsequent refilling.

[0013] As a preferred technical solution of the present invention, the gas is an inert gas or nitrogen.

[0014] As a preferred technical solution of the present invention, the gas is mixed with a gas with a bad smell, which can quickly give an alarm and facilitate the confirmation of the scope of the fire damage point.

[0015] As a preferred technical solution of the present invention, a pigment paste is attached to the inner wall of the outer sheath. When leakage occurs, the pigment paste flows out from the damaged part, making it easy to quickly identify the leakage point.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a cavity between the outer sheath and the inner sheath, and fills the cavity with non-flammable, non-combustible gas. When a fire occurs, the outer sheath can be damaged and the gas can be quickly released. The gas can spread rapidly in a path superior to that of a fire extinguishing agent, suffocating the flame after covering the fire point. The fire extinguishing effect is better and the coverage area is wider. The one-way valve between the outer sheath and the inner sheath can control the gas usage in the event of a fire while supporting the outer sheath to form a cavity to accommodate the non-flammable, non-combustible gas, thereby reducing the fire control cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0018] Figure 2 This is a partial side view of the structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the one-way valve structure of the utility model Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the one-way valve structure of the utility model Figure 2 ;

[0021] Figure 5 This is a front view structural diagram of the one-way valve of the utility model;

[0022] Figure 6 This is a schematic diagram of the one-way valve AA structure of the utility model;

[0023] Figure 7 This is an enlarged structural diagram of the one-way valve B of the utility model.

[0024] In the figure: 1. Conductor; 2. Fire-resistant layer; 3. Fireproof layer; 4. Insulating isolation layer; 5. Flame-retardant filling layer; 6. Flame-retardant tape; 7. Inner sheath; 8. Cavity; 9. Outer sheath; 10. One-way valve; 101. Air vent; 102. Connecting hole; 103. Expansion hole; 11. Valve core; 12. Spring. DETAILED DESCRIPTION

[0025] 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. Example 1

[0026] like Figures 1 to 7 As shown, the utility model discloses an active fire-extinguishing cable installed in a bridge within a mezzanine floor of a building ceiling. The technical solution employed is as follows: a main cable core containing three insulated cores, each containing a conductor 1 comprising a stranded annealed copper conductor. Conductor 1 is wrapped with two fire-resistant layers 2 and three fire-blocking layers 3. Fire-resistant layers 2 comprise mica tape, and fire-blocking layers 3 comprise ceramicized glass fiber tape. Extruded over fire-blocking layers 3 are insulating isolation layers 4 comprising irradiated cross-linked polyethylene. The conductor 1, fire-resistant layers 2, fire-blocking layers 3, and insulating isolation layers 4 together constitute the insulated core.

[0027] In order to maintain the roundness of the main cable core and to further improve the fire resistance, the gaps between the insulating cores are filled with flame-retardant glass fibers, which together form a flame-retardant filling layer 5. The flame-retardant filling layer 5 is wrapped with a glass fiber tape, which forms a flame-retardant tape 6. The above structure together constitutes the cable body.

[0028] In order to protect the cable body, polytetrafluoroethylene is extruded outside the flame retardant tape 6 to form an inner sheath 7. An outer sheath 9 composed of irradiated low-smoke halogen-free polyolefin is provided outside the inner sheath 7. In order to achieve the effect of active fire extinguishing, a cavity 8 is left between the inner sheath 7 and the outer sheath 9. The cavity 8 is filled with nitrogen. In order to maintain the cavity 8 and to prevent all nitrogen leakage of the entire cable in the event of burn damage, which leads to increased maintenance costs in the later period, a one-way valve 10 is provided in the cavity 8. Figure 3 、 Figure 4 As shown, the valve body of the one-way valve 10 is annular, its inner ring is sleeved on the inner sheath 7, and the outer ring surface is lined in the outer sheath 9, in order to achieve a one-way effect, as shown in FIG. Figures 5 to 7When the valve core 11 moves to open the port, the two sides of the valve body can be connected through the air vent 101 and the connecting hole 102. In order to enable the valve core 11 to maintain the closure under normal circumstances, an edge plate is provided on the side of the valve core 11, and an expanded hole 103 is provided on the inner wall of the communicating hole 102. The edge plate is slidably connected in the expanded hole 103, and a spring 12 is pressed between the edge plate and the end surface of the expanded hole 103. Under the action of the spring 12, the valve core 11 maintains the sealing of the end surface of the air vent 101.

[0029] In order to provide timely warning when a fire occurs and to facilitate the investigation of the fire location, a small amount of hydrogen sulfide gas is simultaneously filled into the cavity 8. The concentration of hydrogen sulfide gas is 6 mg / m 3 To provide an alarm while maintaining a low concentration to prevent combustion. To facilitate the identification of the leak point, a pigment paste with a significant color difference from the outer color of the outer sheath 9 is attached to the inner wall of the outer sheath 9. To maintain the shape of the pigment paste, a polyethylene film is used to cover the side of the pigment paste close to the cavity 8.

[0030] The working principle of this utility model:

[0031] When a cable catches fire in a cable bridge, the outer sheath 9 is burned and damaged, causing nitrogen in the cavity 8 to overflow and spread. The overflowing nitrogen quickly fills the bridge and squeezes the oxygen in the air out of the bridge. When the nitrogen overflows at the end of the cable closest to the fire source, the pressure in the cavity 8 of that section decreases. The nitrogen near the cavity 8 begins to move the valve core 11 in the connecting hole 102 through air pressure, compressing the spring 12 and opening the air vent 101 port. The nitrogen near the cavity 8 enters the leaking end and overflows. Similarly, the one-way valve 10 at the front end of the damaged section opens in turn, allowing the nitrogen to overflow and actively extinguish the fire, but its rear end remains closed. The overflowing nitrogen drives away the oxygen at the fire source, suffocating the flames. At the same time, the overflowing gas is mixed with hydrogen sulfide gas, which alarms and prompts people around. At the same time, the pigment paste flows out from the leak point and forms a local diffusion at the leak point under the blowing of the air flow, so that the leak point can be quickly identified.

[0032] The connection method involved in the present invention is a common means used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, and it belongs to common knowledge.

[0033] Components not described in detail herein are prior art.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An active fire extinguishing cable, characterized by: The invention comprises a main cable core, wherein the main cable core comprises a wire core and a flame retardant filling layer (5), wherein the wire core comprises a conductor (1), wherein the conductor (1) is provided with a fire resistant layer (2), a fireproof layer (3) and an insulating isolation layer (4); wherein the flame retardant filling layer (5) is filled on the outside of the wire core, wherein the main cable core is provided with a flame retardant tape (6) and an inner sheath (7), wherein the inner sheath (7) is provided with an outer sheath (9), wherein an annular one-way valve (10) is provided between the inner sheath (7) and the outer sheath (9), wherein the one-way valve (10) separates a cavity (8) between the inner sheath (7) and the outer sheath (9), wherein the cavity (8) is filled with a non-flammable and non-combustible gas.

2. The active fire extinguishing cable according to claim 1, characterized in that: The conductor (1) is an annealed copper wire stranded conductor.

3. The active fire extinguishing cable according to claim 1, characterized in that: The fire-resistant layer (2) is a mica tape, and the number of layers is 2 to 3.

4. The active fire extinguishing cable according to claim 1, characterized in that: The fireproof layer (3) is a ceramicized glass fiber tape, and the number of layers is 2 to 3.

5. The active fire extinguishing cable according to claim 1, characterized in that: The insulating isolation layer (4) is a radiation cross-linked polyethylene layer.

6. The active fire extinguishing cable according to claim 1, characterized in that: The flame-retardant filling layer (5) is flame-retardant glass fiber; the flame-retardant tape (6) is a glass fiber tape; the inner sheath (7) is a polytetrafluoroethylene sheath; and the outer sheath (9) is an irradiated low-smoke halogen-free polyolefin sheath.

7. The active fire extinguishing cable according to claim 1, characterized in that: The main body of the one-way valve (10) is an annular valve body, and a connecting hole (102) is provided on the end surface thereof. A reaming hole (103) is provided in the middle of the connecting hole (102). The side wall of the connecting hole (102) on one side of the reaming hole (103) is connected to the end surface of the valve body on the other side through the air vent (101). A valve core (11) is slidably connected in the connecting hole (102). An edge plate is provided on the valve core (11), and the edge plate is slidably connected in the reaming hole (103). A spring (12) is press-fitted between the edge plate and the end surface of the reaming hole (103).

8. The active fire extinguishing cable according to claim 1, characterized in that: The gas is an inert gas.

9. The active fire extinguishing cable according to claim 8, characterized in that: A pigment paste is attached to the inner wall of the outer sheath (9).

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