Fire resistant cable with external protection

Abstract

The application relates to an outer-protection type fireproof cable in the field of cables, which comprises a wire core, the outer end of the wire core is fixedly connected with a buffer layer, the outer end of the buffer layer is covered with an insulation protective layer, the outer end of the insulation protective layer is sleeved with a plurality of uniformly distributed outer protective sleeves; the buffer layer comprises a filling layer, a plurality of equidistantly distributed monitoring rings are arranged in the filling layer, the monitoring ring comprises a plurality of inlaid columns which are circumferentially distributed, a butt joint seat is arranged on the inlaid column, the butt joint seat extends to the outer surface of the filling layer, a butt joint connector is arranged at the top end of the butt joint seat, a plurality of reinforcing wires which are connected with the inlaid columns are arranged in the wire core; the outer protective sleeve comprises a C-shaped shell, a butt joint plug which is matched with the butt joint seat is arranged on the C-shaped shell; a fire-retardant bag is arranged in the C-shaped shell, the cable is subjected to multiple fireproof protections through the monitoring ring, the reinforcing wire and the outer protective sleeve, the cable is subjected to real-time temperature sensing, and the fire-retardant tube protection is timely responded to when overheating, so that the cable has high safety and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to an external protection type fireproof cable, in particular to an external protection type fireproof cable applied to the field of cables. BACKGROUND

[0002] Existing cables play a crucial role in the fields of power transmission, communication and lighting. However, in terms of fireproof performance, these cables often have certain defects. Traditional cables are prone to burning and producing a large amount of toxic smoke when exposed to high temperatures or fire sources. In addition, the insulation layer and sheath material of some cables may melt rapidly during burning, causing the wires to be exposed and increasing the risk of electric shock and short circuit. This not only exacerbates the severity of the fire, but also may cause secondary disasters.

[0003] Therefore, although existing cables perform well in terms of power transmission and communication, their fireproof performance needs to be improved. In order to improve the fireproof performance of cables, new fireproof cable materials are being developed to ensure that the cable can maintain stable operation for a longer period of time during a fire, giving more time for personnel evacuation and fire fighting.

[0004] To solve the problem of cable protection, some cables in the market use an external metal protection layer design, which has a certain market share.

[0005] Chinese invention patent CN114141416B discloses a fireproof cable. The invention has the advantage of good fireproof effect, solves the problem that existing cables are not convenient to prevent the conductor inside the cable from being damaged by fire and prevent the fire from spreading rapidly through the cable during power transmission, reduces the protection of the cable, and is not convenient for extinguishing the flame around the cable, which easily causes the temperature around the cable to continue to rise.

[0006] The existing cables indeed have obvious deficiencies in fireproof performance. The materials used are prone to burning when exposed to high temperatures, and toxic gases are released during the burning process. The existing cables are not easy to provide flame retardant protection to the cable when it is overheated, nor are they easy to protect against external damage. SUMMARY

[0007] In view of the above prior art, the technical problem to be solved by the present application is that the existing cables are not easy to provide flame retardant protection to the cable when it is overheated, nor are they easy to protect against external damage.

[0008] To solve the above problems, the present application provides an external protection type fireproof cable, which comprises a core, the outer end of the core is fixedly connected with a buffer layer, the outer end of the buffer layer is covered with an insulation protection layer, and the outer end of the insulation protection layer is sleeved with a plurality of evenly distributed external protection sleeves.

[0009] The buffer layer comprises a filling layer, a plurality of monitoring rings are arranged in the filling layer at equal intervals, the monitoring rings comprise a plurality of inlaid columns arranged in a circumferential direction, the inlaid columns are provided with docking seats, the docking seats extend to the outer surface of the filling layer, the top end of the docking seat is provided with a docking connector, and a plurality of reinforcing wires are arranged in the wire core and connected with the inlaid columns;

[0010] The outer protective sleeve comprises a C-shaped shell, a pair of mounting holes are formed in the C-shaped shell, a pair of adjusting rods are rotatably connected in the mounting holes, heat-conducting columns are threadedly connected to the adjusting rods, and a docking plug matched with the docking seat is arranged at the top end of the heat-conducting column; a fire-retardant bag is arranged in the C-shaped shell, a containing cavity matched with the fire-retardant bag is formed in the C-shaped shell, and a grating clamping plate is clamped at the opening of the containing cavity.

[0011] The fire-retardant bag stores liquid fire retardant, positioning blocks are arranged at the two ends of the fire-retardant bag, heat-conducting beams matched with the positioning blocks are arranged at the two ends of the containing cavity, one end of the heat-conducting beam extends into the mounting hole, a plurality of liquid discharge holes are formed in the lower end of the fire-retardant bag, and a plurality of plug blocks for closing the liquid discharge holes are arranged on the wire clamps connected with the positioning blocks, and the positioning blocks and the wire clamps are connected through glass balls filled with thermal expansion liquid.

[0012] In the outer protective fireproof cable, the wire core temperature is monitored through the inlaid monitoring ring, the outer protective sleeve is used for external protection, and the outer protective sleeve can release liquid fire retardant to the cable to perform fireproof protection when the wire core is overheated.

[0013] As a further improvement of the present application, auxiliary wires are connected between the plurality of outer protective sleeves, the auxiliary wires comprise data transmission lines, a plurality of distributed connectors are arranged on the data transmission lines, wire seats matched with the distributed connectors are arranged on the outer protective sleeves, temperature sensors matched with the heat-conducting columns are arranged in the outer protective sleeves, the distributed connectors are used for transmitting data, auxiliary supports are arranged on the outer protective sleeves, and communication terminals connected with the auxiliary wires are arranged on the auxiliary supports.

[0014] As a further improvement of the present application, the C-shaped shell is made of an elastic material, a plurality of flow guide grooves are formed in the inner wall of the C-shaped shell, and heat dissipation plates are embedded and arranged in the flow guide grooves.

[0015] As a further improvement of the present application, the reinforcing wire comprises a heat-conducting wire core, the heat-conducting wire core is attached to the outer surface of the wire core, and the reinforcing wire is used for monitoring the temperature of the wire core.

[0016] As a further improvement of the present application, a docking groove matched with the docking plug is formed in the middle of the docking seat, a plurality of liquid permeation channels surrounding the docking groove are formed in the outer part of the docking groove, and the output ends of the liquid permeation channels are located on the outer wall of the inlaid column close to the reinforcing wire.

[0017] As a further improvement of the present application, a plurality of pre-cut holes matching the docking seat are formed on the insulating protective layer, the pre-cut holes are distributed around the outer edge of the docking seat, and the insulating protective layer region of the installed outer protective sleeve is cut locally along the pre-cut holes.

[0018] As a further improvement of the present application, the grid hole diameter of the grid card is larger than the diameter of the plug block, and when the wire bundle is connected with the positioning block, the plug block is clamped into the drainage hole.

[0019] As a further improvement of the present application, the accommodation cavity is arranged in a plurality of C-shaped shells and is uniformly distributed, a pressure sensor electrically connected to the terminal seat is arranged on the inner wall of the accommodation cavity, and when the fire-retardant bag is in a liquid-filled state in the accommodation cavity, the pressure sensor is subjected to the pressure of the fire-retardant bag.

[0020] In summary, the cable is protected by multiple fireproofing through the monitoring ring, the reinforcing wire, and the outer protective sleeve, the temperature of the cable is sensed in real time, and the fire-retardant tube is protected in time when overheating, which has high safety and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a perspective view of the first and second embodiments of the present application;

[0022] Figure 2 It is a perspective view of the outer protective sleeve of the first and second embodiments of the present application;

[0023] Figure 3 It is a sectional view of the outer protective sleeve of the first and second embodiments of the present application;

[0024] Figure 4 It is Figure 3 It is a structural schematic view of position A in the middle;

[0025] Figure 5 It is Figure 3 It is a structural schematic view of position B in the middle;

[0026] Figure 6 It is a perspective view of the fire-retardant bag of the first and second embodiments of the present application;

[0027] Figure 7 It is a schematic view of the connection between the outer protective sleeve and the monitoring system of the second embodiment of the present application.

[0028] REFERENCE NUMERALS IN DRAWINGS:

[0029] 1 wire core body, 11 reinforcing wire, 2 buffer layer, 21 filling layer, 22 embedded column, 23 docking seat, 3 outer protective sleeve, 31 C-shaped shell, 32 adjusting rod, 33 heat-conducting column, 34 docking plug, 35 heat-conducting beam, 4 auxiliary wire, 5 fire-retardant bag, 51 positioning block, 52 wire bundle. DETAILED DESCRIPTION

[0030] The two embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0031] The first embodiment:

[0032] Figures 1-6 It is shown that an outer protective fireproof cable includes a core 1, the outer end of the core 1 is fixedly connected with a buffer layer 2, the outer end of the buffer layer 2 is covered with an insulating protective layer, and the outer end of the insulating protective layer is sleeved with a plurality of uniformly distributed outer protective sleeves 3;

[0033] The buffer layer 2 includes a filling layer 21, a plurality of equidistantly distributed monitoring rings are arranged in the filling layer 21, the monitoring ring includes a plurality of inlaid columns 22 that are circumferentially distributed, a butt joint seat 23 is arranged on the inlaid column 22, the butt joint seat 23 extends to the outer surface of the filling layer 21, a butt joint connector is arranged at the top end of the butt joint seat 23, and a plurality of reinforcing wires 11 that are connected with the inlaid columns 22 are arranged in the core 1; the reinforcing wire 11 includes a heat-conducting core that is attached to the outer surface of the core 1, and the reinforcing wire 11 is used for transmitting the temperature of the core 1 to the inlaid columns 22;

[0034] The outer protective sleeve 3 includes a C-shaped shell 31, a pair of mounting holes are formed in the C-shaped shell 31, a pair of adjusting rods 32 are rotatably connected in the mounting holes, a heat-conducting column 33 is threadedly connected to the adjusting rod 32, a butt joint plug 34 that is matched with the butt joint seat 23 is arranged at the top end of the heat-conducting column 33, and the heat-conducting column 33 moves linearly when the adjusting rod 32 rotates; a fire-retardant bag 5 is placed in the C-shaped shell 31, and a liquid fire retardant is stored in the fire-retardant bag 5; a containing cavity that is matched with the fire-retardant bag 5 is formed in the C-shaped shell 31, and a grating clamping plate is clamped at the opening of the containing cavity; the grating holes arranged on the grating clamping plate have a larger diameter than the diameter of the plug, and the plug is clamped into the liquid discharge hole when the binding wire 52 is connected with the positioning block 51, and the plug can pass through the grating plate when the plug is washed away by the liquid;

[0035] The fire-retardant bag 5 is provided with the positioning block 51 at both ends, the containing cavity is provided with the heat-conducting beam 35 that is clamped with the positioning block 51 at both ends, one end of the heat-conducting beam 35 extends into the mounting hole, a plurality of liquid discharge holes are formed at the lower end of the fire-retardant bag 5, the fire-retardant bag 5 is provided with the binding wire 52 that is connected with the positioning block 51 at both ends, a plurality of plugs for closing the liquid discharge holes are arranged on the binding wire 52, and the positioning block 51 and the binding wire 52 are connected through the glass ball filled with the thermal expansion liquid; the appropriate type of thermal expansion liquid is filled into the glass ball by the person skilled in the art, and the glass ball that is broken at a high temperature state by filling the liquid is the prior art, and the glass ball and the thermal expansion liquid are described in detail.

[0036] The C-shaped shell 31 is made of elastic material, and a plurality of flow guide grooves are formed in the inner wall of the C-shaped shell 31, and a heat dissipation plate is embedded and installed in the flow guide grooves; the C-shaped shell 31 of the scheme is made of elastic material, which is convenient and fast to install, and the plurality of flow guide grooves and the heat dissipation plate formed in the inner wall are helpful to the rapid dissipation of heat;

[0037] When the fire-retardant bag 5 is installed, the positioning block 51 can be clamped with the heat-conducting beam 35 to complete the installation, which makes the replacement and maintenance of the fire-retardant bag 5 simple and convenient, and reduces the maintenance cost.

[0038] A plurality of heat exchange sheets are connected between the heat-conducting beam 35 and the heat-conducting column 33, and a plurality of through holes matched with the heat-conducting column are formed in the plurality of heat exchange sheets, and the heat-conducting column 33 is arranged between the plurality of heat exchange sheets;

[0039] The heat of the wire core is transmitted to the outside of the outer protective layer through the heat-conducting column 33, the mating plug 34, the embedded column 22 and the mating seat 23

[0040] The heat-conducting beam 35, so that the glass ball heat-expanding liquid expands when the temperature is too high; the glass ball is broken by the expansion liquid, and the bundle wire 52 is disconnected from the positioning block 51, and the external supporting force of the plug is released, at this time, the liquid fire retardant in the fire-retardant bag 5 is discharged from the liquid discharge hole, and then the liquid fire retardant passes through the grid plate to release to the insulating protective layer, so as to realize the external fire-retardant protection of the cable;

[0041] The middle part of the mating seat 23 is provided with a mating groove matched with the mating plug 34, and the outside of the mating groove is provided with a plurality of liquid permeation channels surrounding the mating groove, and the output end of the liquid permeation channel is located on the outer wall of the embedded column 22 close to one end of the reinforcing wire 11.

[0042] When the liquid fire retardant is close to the mating seat 23, the fire retardant penetrates into the filling layer 21 through the liquid permeation channel, so as to add the fire retardant in the cable to realize the internal fire-retardant protection of the cable.

[0043] Compared with the existing cable, through the design of the outer protective sleeve 3, the cable not only has external fire-retardant protection, but also releases the liquid fire retardant into the cable when the internal temperature of the cable is too high, which further improves the fireproof performance of the cable.

[0044] A plurality of monitoring rings and reinforcing wires 11 are arranged in the cable to realize real-time sensing of the temperature change of the wire core 1, and the heat of the wire core is transmitted to the outer protective sleeve 3 through the heat-conducting column 33, the mating plug 34, the embedded column 22 and the mating seat 23, on the one hand, it is convenient to make the positioning block 51 of the fire-retardant bag 5 break and release the fire retardant when the wire core is overheated; on the other hand, it is convenient to install a temperature sensor in the outer protective sleeve 3 to collect the temperature data of the wire core 1, which makes the cable respond quickly to temperature changes and automatically release the fire retardant when necessary, which improves the safety of the cable.

[0045] The second embodiment:

[0046] Figures 2-7 It is shown that a plurality of pre-cut holes are opened on the insulation protective layer and matched with the butt joint seat 23, the pre-cut holes are distributed along the circumference of the outer edge of the butt joint seat 23, the area of the insulation protective layer where the outer protective sleeve 3 is installed is cut locally along the pre-cut holes; optionally, a protective film is laid on the pre-cut holes according to the use environment to close the pre-cut holes, thereby avoiding the infiltration of external pollutants into the cable.

[0047] In the initial state of the insulation protective layer of the scheme, the surface thereof is provided with a region corresponding to the butt joint seat 23, and the region is provided with pre-cut holes distributed in a ring shape around the butt joint seat 23. On the one hand, the position of the butt joint seat 23 is conveniently positioned through the pre-cut holes. On the other hand, the heat dissipation of the wire core 1 is facilitated.

[0048] A plurality of outer protective sleeves 3 are connected with an auxiliary wire 4. The auxiliary wire 4 includes a data transmission line 41, and a plurality of distributed connectors 42 are installed on the data transmission line 41. The outer protective sleeve 3 is provided with a terminal seat matched with the distributed connector 42. A temperature sensor matched with the heat conduction column 33 is installed in the outer protective sleeve 3. The distributed connector 42 is used for transmitting data. The outer protective sleeve 3 is provided with an auxiliary support, and a communication terminal connected with the auxiliary wire 4 is installed on the auxiliary support. The communication terminal is signal-connected with an external monitoring system.

[0049] The accommodating cavities are arranged in a plurality of C-shaped shells 31 and are uniformly distributed. A pressure sensor electrically connected with the terminal seat is arranged on the inner wall of the accommodating cavity. When the fire-retardant bag 5 is kept in a liquid full state in the accommodating cavity, the pressure sensor is subjected to the pressure action of the fire-retardant bag 5.

[0050] When the temperature sensor collects a value higher than a set value, it is judged that the temperature of the wire core is too high, and the monitoring system alarms. When the pressure value detected by the pressure sensor is lower than a set value, it is indicated that the fire retardant in the fire-retardant bag 5 is released or leaked, and the monitoring system alarms.

[0051] In the installation of the outer protective sleeve 3 of the scheme, the pre-cut hole is first ring-cut, so that the insulation protective layer at the butt joint seat 23 is cut off. The outer protective sleeve 3 is directly clamped on the cable, and then the angle of the outer protective sleeve 3 is adjusted, so that the butt joint seat 23 is matched with the position of the butt joint plug 34. Then the rotating adjusting rod 32 is adjusted, so that the heat conduction column 33 is inserted to the butt joint seat 23, until the butt joint plug 34 is butt-jointed with the butt joint seat 23, so as to complete the installation and positioning of the outer protective sleeve 3.

[0052] Then, the outer protective sleeve 3 with a suitable position is selected to install the auxiliary support, and the auxiliary wire 4 is installed between a plurality of outer protective sleeves 3. When the auxiliary wire 4 is installed, the distributed connector 42 is butt-jointed with the terminal seat to complete the installation. Finally, the auxiliary wire 4 is wired with the communication terminal on the auxiliary support to complete the connection between the outer protective sleeve 3 and the external monitoring system.

[0053] The pre-cut hole formed on the insulating protective layer not only facilitates the positioning of the connector 23 and improves the installation efficiency, but also provides a heat dissipation channel for the core 1, which helps the cable to maintain stable performance in a high-temperature environment.

[0054] Through the auxiliary wire 4 and the data transmission line 41 and the distributed joint 42 thereon, the scheme realizes real-time monitoring of the internal state of the outer protective sleeve 3. This not only includes the monitoring of the core temperature by the temperature sensor, but also includes the monitoring of the state of the fire-retardant agent in the fire-retardant bag 5 by the pressure sensor; such real-time data transmission provides a strong guarantee for the safe operation of the cable.

[0055] When the values collected by the temperature sensor or the pressure sensor are abnormal, the system will immediately issue an alarm to remind the staff to handle the potential safety hazard in a timely manner.

[0056] In summary, the scheme provides multiple fire protection for the cable through the monitoring ring, the reinforcing wire 11 and the outer protective sleeve 3, and performs real-time temperature sensing on the cable, and performs fire-retardant tube protection in a timely manner when overheating, which has high safety and reliability.

[0057] In combination with the current actual demand, the above-mentioned embodiments adopted by the present application are not limited to this, various changes made within the knowledge range of those skilled in the art without departing from the concept of the present application still fall within the protection range of the present application.

Claims

1. An outer shielded fire resistant cable comprising a core (1), characterised in that: The outer end of the core (1) is fixedly connected with a buffer layer (2), the outer end of the buffer layer (2) is covered with an insulation protective layer, and the outer end of the insulation protective layer is sleeved with a plurality of uniformly distributed outer protective sleeves (3); The buffer layer (2) comprises a filling layer (21), a plurality of equidistantly distributed monitoring rings are arranged in the filling layer (21), the monitoring ring comprises a plurality of inlaid columns (22) that are circumferentially distributed, a butt joint seat (23) is arranged on the inlaid column (22), the butt joint seat (23) extends to the outer surface of the filling layer (21), a butt joint connector is arranged at the top end of the butt joint seat (23), a plurality of reinforcing wires (11) connected with the inlaid column (22) are arranged in the core (1). The outer protective sleeve (3) comprises a C-shaped shell (31), a pair of mounting holes are formed in the C-shaped shell (31), a pair of adjusting rods (32) are rotatably connected in the mounting holes, a heat-conducting column (33) is threadedly connected to the adjusting rod (32), and a butt joint plug (34) matched with the butt joint seat (23) is arranged at the top end of the heat-conducting column (33); a fire-retardant bag (5) is arranged in the C-shaped shell (31), a containing cavity matched with the fire-retardant bag (5) is formed in the C-shaped shell (31), and a grating clamping plate is clamped at the opening of the containing cavity. The fire-retardant bag (5) stores a liquid fire retardant, positioning blocks (51) are arranged at the two ends of the fire-retardant bag (5), heat-conducting beams (35) clamped with the positioning blocks (51) are arranged at the two ends of the containing cavity, one end of the heat-conducting beam (35) extends into the mounting hole, a plurality of liquid discharge holes are formed in the lower end of the fire-retardant bag (5), and binding wires (52) connected with the positioning blocks (51) are arranged at the upper and lower ends of the fire-retardant bag (5), a plurality of plug blocks for closing the liquid discharge holes are arranged on the binding wire (52), and the positioning block (51) and the binding wire (52) are connected through glass balls filled with thermal expansion liquid.

2. An outer shielded fire resistant cable according to claim 1, characterised in that: A plurality of the outer protective sleeves (3) are connected with an auxiliary wire (4), the auxiliary wire (4) comprises a data transmission wire (41), a plurality of distributed connectors (42) are arranged on the data transmission wire (41), wire seats matched with the distributed connectors (42) are arranged on the outer protective sleeve (3), temperature sensors matched with the heat-conducting column (33) are arranged in the outer protective sleeve (3), the distributed connector (42) is used for transmitting data, an auxiliary support is arranged on the outer protective sleeve (3), and a communication terminal connected with the auxiliary wire (4) is arranged on the auxiliary support.

3. An outer shielded fire resistant cable according to claim 1, characterised in that: The C-shaped shell (31) is made of elastic material, a plurality of flow guide grooves are formed in the inner wall of the C-shaped shell (31), and heat dissipation plates are embedded and arranged in the flow guide grooves.

4. An outer shielded fire resistant cable according to claim 1, characterised in that: The reinforcing wire (11) comprises a heat-conducting core, the heat-conducting core is attached to the outer surface of the core (1), and the reinforcing wire (11) is used for transmitting the temperature of the core (1) to the plurality of inlaid columns (22).

5. An outer shielded fire resistant cable according to claim 1, characterized in that: The middle part of the docking seat (23) is provided with a docking groove matched with the docking plug (34), and the outer part of the docking groove is provided with a plurality of liquid-permeable channels surrounding the docking groove, and the output end of the liquid-permeable channel is located on the outer wall of the inlaid column (22) close to one end of the reinforcing wire (11).

6. An outer shielded fire resistant cable according to claim 1, characterized in that: A plurality of pre-cut holes matched with the docking seat (23) are arranged on the insulating protective layer, the pre-cut holes are circumferentially distributed around the outer edge of the docking seat (23), the insulating protective layer area of the installed outer protective sleeve (3) is cut locally along the pre-cut hole.

7. An outer shielded fire resistant cable according to claim 1, characterized in that: The grid hole diameter of the grid card is greater than the diameter of the plug, and when the wire bundle (52) is connected with the positioning block (51), the plug is clamped into the drainage hole.

8. An outer shielded fire resistant cable according to claim 2, characterised in that: The accommodating cavities are arranged in a plurality of C-shaped shells (31) and are uniformly distributed, a pressure sensor electrically connected with the wire holder is arranged on the inner wall of the accommodating cavity, and when the fire-retardant bag (5) keeps a liquid full state in the accommodating cavity, the pressure sensor is subjected to the pressure action of the fire-retardant bag (5).

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