Non-combustible cable capable of self-extinguishing after being away from fire

Abstract

The invention discloses an off-fire self-extinguishing non-combustible cable, relates to the technical field of cables, and aims to solve the technical problems that a protection layer of a current cable is not internally provided with a movable cavity, the protection layer is easy to deform and extrude the cable due to foaming, and the normal transmission rate of the cable is influenced. An insertion opening is formed in the middle of the interior of the expansion fire-resistant sleeve, built-in grooves are distributed in the inner wall of the insertion opening in an annular array mode, assembling openings are formed in the outer side of the expansion fire-resistant sleeve in an annular array mode, through openings are formed in the bottoms of the assembling openings and communicate with the interior of the insertion opening, and ammonium chloride wafers are installed in the assembling openings in an embedded mode; the holder is installed in the socket in an inserted mode, the outer sheath is installed on the outer side of the expansion fire-resistant sleeve in a sleeved mode, and the cable is installed in the expansion fire-resistant sleeve. The cable is provided with the built-in foaming cavity, so that cable bending caused by foaming extrusion deformation is avoided, and the normal transmission rate of the cable is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of cables, and more particularly to a non-flammable cable which can extinguish itself when away from fire. Background Art

[0002] When a fire occurs, non-combustible cables will not burn like ordinary cables and become a medium for the spread of fire. They can effectively limit the flames to a local area, prevent the fire from spreading rapidly along the cable line, and reduce the harm of the fire to buildings, equipment and personnel. For the power supply circuits of key emergency facilities such as fire-fighting equipment, emergency lighting, evacuation signs, and fire alarm systems, non-combustible cables that are self-extinguishing when away from the fire can maintain normal power supply during the fire, ensuring that these equipment can play a role at critical moments and provide necessary support and guarantee for personnel evacuation and rescue work.

[0003] The existing non-combustible cables use an expanded fire-resistant layer outside the aluminum metal sheath, which will foam and solidify under the attack of flames. After solidification, it will isolate the internal cable from damage by external flames. However, the existing structure does not have an effective active cavity inside during the foaming process, which causes the outer protective layer to expand and deform, which is easy to squeeze the internal cable, causing bending and affecting the normal transmission rate of the cable. In view of this, we propose a non-combustible cable that self-extinguishes when away from fire. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, meet actual needs, and provide a non-flammable cable that is self-extinguishing when away from fire, so as to solve the technical problems that the current cable protective layer does not have a movable cavity, foaming easily causes the protective layer to deform and squeeze the cable, and affects the normal transmission rate of the cable.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a non-combustible cable that extinguishes itself when away from fire, comprising a cable, an expansion fire-resistant sleeve and a retaining frame, a socket is provided in the middle of the interior of the expansion fire-resistant sleeve, and a ring array of built-in grooves are distributed on the inner wall of the socket, an assembly port is provided in the outer ring array of the expansion fire-resistant sleeve, a through port is provided at the bottom of the assembly port, and the through port is connected to the socket, an ammonium chloride wafer is embedded and installed in the assembly port, the retaining frame is plugged into the socket, an outer sheath is installed on the outer side of the expansion fire-resistant sleeve, and the cable is installed inside the expansion fire-resistant sleeve.

[0006] When the present invention is eroded by flame, the outer sheath of halogen-free low-smoke polyolefin is used for external protection. When the flame burns, due to the material reason, the outer sheath automatically extinguishes after leaving the fire. At the same time, the inner expansion refractory sleeve is foamed and solidified after being heated. The expansion refractory sleeve is provided with an assembly port and a through port. The assembly port and the through port are reserved for foaming stress-bearing ports. When the expansion refractory sleeve is foamed, an extrusion force is generated on the cavity inside of the assembly port and the through port, so as to prevent the expansion refractory sleeve from expanding outwards after foaming and being squeezed inwards by the outer sheath, causing the internal cable to bend and affecting the transmission rate. Through the above-mentioned reserved deformation after foaming, the expansion refractory sleeve is prevented from expanding outwards after foaming and being squeezed inwards by the outer sheath. The internal force of the cavity is reduced to avoid internal deformation and oppression of the cable, ensuring the normal signal transmission rate. The ammonium chloride chip is embedded and installed inside the assembly port. The assembly port is designed to be concave inward with a smaller outer opening. When the expansion refractory sleeve is heated and foamed and solidified, the space of the assembly port is gradually reduced and then an extrusion force is generated. The extrusion breaks the ammonium chloride chip. The structure of the ammonium chloride chip is stable. When it is extruded and broken, the crystal structure is destroyed, and an endothermic decomposition reaction will occur. The influence of heat transfer on the cable is reduced by heat absorption, further protecting the internal cable and ensuring its normal operation.

[0007] Preferably, the built-in grooves and the side grooves are both designed to be arc-shaped structures, and the corresponding built-in grooves and side grooves are spliced ​​to form a circular cavity, and the cable is located in the circular cavity.

[0008] Preferably, the assembly opening and the built-in groove are staggered, the assembly opening is of an inwardly concave design with an outer opening gathered inwardly, and the assembly opening is adapted to the ammonium chloride wafer.

[0009] Preferably, an isolation sleeve is provided on the outer side of the cable, and notches are formed on the isolation sleeve, and the notches are distributed in a spiral shape.

[0010] Preferably, the isolation sleeve is a cross-linked isolation sleeve, and the isolation sleeve is made of a polyethylene material modified by a cross-linking reaction.

[0011] Preferably, the expansion refractory sleeve is made of halogen-free low-smoke polyolefin material, and the assembly openings opened on the outer side of the expansion refractory sleeve are equidistantly distributed in the longitudinal direction.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention designs an expandable refractory sleeve. When it is eroded by flame, an outer sheath of halogen-free low-smoke polyolefin is used for external protection. When the flame burns, the outer sheath automatically extinguishes after leaving the fire due to material reasons. At the same time, the inner expandable refractory sleeve foams and solidifies after being heated. An assembly port and a through port are provided on the expandable refractory sleeve. The assembly port and the through port are reserved for foaming stress-bearing ports. When the expandable refractory sleeve is foamed, an extrusion force is generated on the cavity inside of the assembly port and the through port to prevent the expandable refractory sleeve from expanding outwards after foaming and being squeezed inwards by the outer sheath, causing the internal cable to bend and affect the transmission rate. The internal force is reduced by the above-mentioned reserved deformation cavity after foaming, to prevent the internal deformation from compressing the cable, and to ensure the normal signal transmission rate.

[0014] 2. The present invention also designs an ammonium chloride wafer, which is embedded and installed inside the assembly port. The assembly port is designed to be inwardly concave with a smaller outer opening. When the expansion refractory sleeve is heated, foamed and solidified, the assembly port space is gradually reduced and then an extrusion force is generated. The extrusion breaks the ammonium chloride wafer. The ammonium chloride wafer has a stable structure. When it is extruded and broken, the crystal structure is destroyed, and an endothermic decomposition reaction occurs. The influence of heat transfer on the cable line is reduced by heat absorption, and the internal cable line is further protected to ensure its normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0017] Figure 3 It is a schematic diagram of the structure of the expansion refractory sleeve of the present invention;

[0018] Figure 4 It is a cross-sectional structural schematic diagram of the present invention;

[0019] Figure 5 It is a schematic diagram of the socket structure of the present invention.

[0020] Explanation of the numbers in the figure: 1, isolation sleeve; 101, recess; 102, cable; 2, outer sheath; 3, expansion refractory sleeve; 301, ammonium chloride wafer; 302, assembly port; 303, through port; 304, built-in groove; 305, socket; 4, retaining frame; 401, side groove. DETAILED DESCRIPTION

[0021] like Figures 1 to 4As shown, the present invention relates to a fire-proof and self-extinguishing non-combustible cable, comprising a cable 102, an expansion fire-resistant sleeve 3 and a retaining frame 4, a socket 305 is provided in the middle of the expansion fire-resistant sleeve 3, and the inner wall of the socket 305 is provided with a ring array of built-in grooves 304, the built-in grooves 304 and the side grooves 401 are both designed in an arc-shaped structure, and the corresponding built-in grooves 304 and side grooves 401 are spliced ​​to form a circular cavity, the cable 102 is located in the circular cavity, an assembly port 302 is provided in an outer ring array of the expansion fire-resistant sleeve 3, a through port 303 is provided at the bottom of the assembly port 302, and the through port 303 is connected to the socket 305, an ammonium chloride wafer 301 is embedded and installed in the assembly port 302, the assembly port 302 and the built-in grooves 304 are staggered, the assembly port 302 is an inwardly concave design with the outer opening gathered inwardly, and the assembly port 302 is compatible with the ammonium chloride wafer 301. When it is eroded by flame, it is protected externally by the outer sheath 2 of halogen-free low-smoke polyolefin. When the flame burns, the outer sheath 2 is automatically extinguished after leaving the fire due to material reasons. At the same time, the inner expansion refractory sleeve 3 is foamed and solidified after being heated. The expansion refractory sleeve 3 is provided with an assembly port 302 and a through port 303. The assembly port 302 and the through port 303 are reserved for foaming force-bearing ports. When the expansion refractory sleeve 3 is foamed, an extrusion force is generated inside the cavity of the assembly port 302 and the through port 303 to prevent the expansion refractory sleeve 3 from expanding outwards after foaming and being squeezed inwards by the outer sheath 2, causing the internal cable 102 to bend and affect the transmission rate. The internal force is reduced through the above-mentioned reserved deformation cavity after foaming to prevent the internal deformation from compressing the cable 102, thereby ensuring the normal signal transmission rate.

[0022] like Figures 2 to 5 As shown, the present invention relates to a fire-free self-extinguishing non-combustible cable, comprising a cable 102, an expanded fire-resistant sleeve 3 and a retainer 4, wherein the retainer 4 is plugged and installed in a socket 305, an outer sleeve 2 is installed on the outer side of the expanded fire-resistant sleeve 3, the cable 102 is installed inside the expanded fire-resistant sleeve 3, an isolation sleeve 1 is arranged on the outer side of the cable 102, a notch 101 is opened on the isolation sleeve 1, and the notch 101 is spirally distributed, the isolation sleeve 1 is a cross-linked isolation sleeve, and the isolation sleeve 1 is composed of a polyethylene material modified by a cross-linking reaction, the expanded fire-resistant sleeve 3 is composed of a halogen-free low-smoke polyolefin material, and the outer side of the expanded fire-resistant sleeve 3 is provided with a plurality of notches 101, and the notches 101 are spirally distributed. The isolation sleeve 1 is a cross-linked isolation sleeve, and the isolation sleeve 1 is composed of a polyethylene material modified by a cross-linking reaction, the expanded fire-resistant sleeve 3 is composed of a halogen-free low-smoke polyolefin material, and the outer side of the expanded fire-resistant sleeve 3 is provided with a plurality of notches 101, and the notches 101 are spirally distributed. The assembly openings 302 opened on the side are equidistantly distributed in the longitudinal direction, and the ammonium chloride wafers 301 are embedded and installed inside the assembly openings 302. The assembly openings 302 are designed to be inwardly concave with a smaller outer opening. When the expansion refractory sleeve 3 is heated, foamed and solidified, the space of the assembly opening 302 is gradually reduced and then an extrusion force is generated. The extrusion breaks the ammonium chloride wafers 301. The ammonium chloride wafers 301 have a stable structure. When they are squeezed and broken, the crystal structure is destroyed, and an endothermic decomposition reaction occurs. The influence of heat transfer on the cable 102 is reduced by heat absorption, and the internal cable 102 is further protected to ensure its normal operation.

[0023] Working principle: This embodiment provides a non-combustible cable that is self-extinguishing when away from fire. When it is eroded by flames, it is protected externally by the outer sheath 2 of halogen-free low-smoke polyolefin. When the flame burns, due to material reasons, the outer sheath 2 automatically extinguishes after leaving the fire. At the same time, the inner expansion fire-resistant sleeve 3 is foamed and solidified after being heated. The expansion fire-resistant sleeve 3 is provided with an assembly port 302 and a through port 303. The assembly port 302 and the through port 303 are reserved for foaming stress ports. When the expansion fire-resistant sleeve 3 is foamed, an extrusion force is generated on the cavity inside the assembly port 302 and the through port 303 to prevent the expansion fire-resistant sleeve 3 from expanding outward after foaming. At the same time, the outer sheath 2 is limited and squeezed inward, causing the internal cable 102 to bend and affect the transmission rate. The ammonium chloride chip 301 is embedded and installed inside the assembly port 302. The assembly port 302 is designed to be concave inward with a smaller outer opening. When the expansion refractory sleeve 3 is heated, foamed and solidified, the space of the assembly port 302 is gradually reduced and then an extrusion force is generated. The extrusion breaks the ammonium chloride chip 301. The ammonium chloride chip 301 has a stable structure. When it is squeezed and broken, the crystal structure is destroyed, and an endothermic decomposition reaction occurs. The influence of heat transfer on the cable 102 is reduced by heat absorption.

[0024] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A non-combustible cable that is self-extinguishing when away from fire, comprising a cable (102), an expanded fire-resistant sleeve (3) and a retaining frame (4), characterized in that: The middle of the expansion refractory sleeve (3) is provided with a socket (305), and the inner wall of the socket (305) is provided with built-in grooves (304) in a circular array. The outer side of the expansion refractory sleeve (3) is provided with an assembly port (302) in a circular array. The bottom of the assembly port (302) is provided with a through port (303), and the through port (303) is connected to the socket (305). An ammonium chloride wafer (301) is embedded and installed in the assembly port (302). The retaining frame (4) is plugged and installed in the socket (305). The outer side of the expansion refractory sleeve (3) is sleeved and installed with an outer sheath (2), and the cable (102) is installed inside the expansion refractory sleeve (3).

2. A fire-resistant self-extinguishing non-combustible cable according to claim 1, characterized in that: The built-in groove (304) and the side groove (401) are both designed to be arc-shaped structures, and the corresponding built-in grooves (304) and side grooves (401) are spliced ​​to form a circular cavity, and the cable (102) is located in the circular cavity.

3. A fire-resistant self-extinguishing non-combustible cable according to claim 2, characterized in that: The assembly opening (302) and the built-in groove (304) are staggered in distribution, the assembly opening (302) is of an inwardly concave design with an outer opening gathered inwardly, and the assembly opening (302) is adapted to the ammonium chloride wafer (301).

4. A fire-resistant self-extinguishing non-combustible cable according to claim 3, characterized in that: An isolation sleeve (1) is provided on the outer side of the cable (102), and recesses (101) are provided on the isolation sleeve (1), and the recesses (101) are distributed in a spiral shape.

5. A fire-resistant self-extinguishing non-combustible cable according to claim 4, characterized in that: The isolation sleeve (1) is a cross-linked isolation sleeve, and the isolation sleeve (1) is made of a polyethylene material modified by a cross-linking reaction.

6. A fire-resistant self-extinguishing non-combustible cable according to claim 5, characterized in that: The expansion refractory sleeve (3) is made of a halogen-free low-smoke polyolefin material, and the assembly openings (302) opened on the outside of the expansion refractory sleeve (3) are equidistantly distributed in the longitudinal direction.

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