External protection type fireproof cable

Abstract

The invention relates to an external 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 coated with an insulation protection layer, and the outer end of the insulation protection layer is sleeved with a plurality of uniformly distributed outer protection sleeves; the buffer layer comprises a filling layer, a plurality of monitoring rings which are distributed at equal intervals are arranged in the filling layer, each monitoring ring comprises a plurality of embedded columns which are distributed circumferentially, butt joint seats are arranged on the embedded columns, the butt joint seats extend to the outer surface of the filling layer, butt joints are arranged at the top ends of the butt joint seats, and a plurality of reinforcing wires which are connected with the embedded columns are arranged in the wire core in a penetrating manner; the outer protective sleeve comprises a C-shaped shell, and a butt joint plug matched with the butt joint base is installed on the C-shaped shell. A flame-retardant bag is placed in the C-shaped shell, multiple fireproof protection is carried out on the cable through the monitoring ring, the strengthening line and the outer protection sleeve, temperature sensing is carried out on the cable in real time, and timely response is carried out when the cable is overheated to carry out flame-retardant pipe protection, so that the cable has high safety and reliability.

Description

Technical Field

[0001] The present invention relates to an externally protected fireproof cable, in particular to an externally protected fireproof cable applied in the field of cables. Background Art

[0002] Existing cables play a vital role in power transmission, communication, and lighting. However, these cables often have certain defects in fire resistance. Traditional cables are prone to burn and produce a lot of toxic smoke when encountering high temperatures or fire sources. In addition, the insulation and sheath materials of some cables may melt quickly when burning, resulting in exposed wires, increasing the risk of electric shock and short circuits. This will not only increase the severity of the fire, but may also cause secondary disasters.

[0003] Therefore, although the existing cables have excellent performance in power transmission and communication, their fire resistance needs to be improved. In order to improve the fire resistance of cables, people are developing new fire-resistant cable materials to ensure that the cables can maintain stable operation for a long time when a fire occurs, buying more time for personnel evacuation and fire fighting.

[0004] In order to solve the problem of cable protection, a certain cable in the market adopts the design of an external metal protective layer, which has a certain market share.

[0005] Chinese invention patent CN114141416B discloses a fireproof cable, which has the advantage of good fireproof effect. It solves the problem that the existing cables are not convenient to prevent the conductor inside the cable from being damaged by flames during the transportation of electricity, and prevent the fire from spreading quickly through the cable, which reduces the protection of the cable, makes it difficult to extinguish the flame around the cable, and easily causes the temperature around the cable to continue to rise.

[0006] Existing cables do have obvious deficiencies in fire resistance. The materials used are often easy to burn when exposed to high temperatures, and toxic gases are released during the combustion process. Existing cables are not easy to flame retardant when the cables are overheated, nor are they easy to protect against external damage. Summary of the invention

[0007] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that it is not easy to provide flame retardant protection to the existing cables when the cables are overheated, and it is also not easy to provide protection against external damage.

[0008] In order to solve the above problems, the present invention provides an externally protected fireproof cable, comprising a wire core, the outer end of the wire core is fixedly connected to a buffer layer, the outer end of the buffer layer is coated with an insulating protective layer, and the outer end of the insulating protective layer is covered with a plurality of evenly distributed outer protective sleeves; The buffer layer includes a filling layer, a plurality of equally spaced monitoring rings are arranged in the filling layer, the detection rings include a plurality of circumferentially distributed embedded columns, a docking seat is arranged on the embedded column, the docking seat extends to the outer surface of the filling layer, a docking joint is arranged on the top of the docking seat, and a plurality of reinforcing wires connected to the embedded columns are passed through the wire core; The outer protective cover comprises a C-shaped shell, a pair of mounting holes are provided on the C-shaped shell, a pair of adjusting rods are rotatably connected in the mounting holes, a heat-conducting column is threadedly connected to the adjusting rod, and a docking plug matching the docking seat is installed on the top of the heat-conducting column; a flame-retardant bag is placed in the C-shaped shell, a receiving cavity matching the flame-retardant bag is provided in the C-shaped shell, and a grille card is clamped at the opening of the receiving cavity; Liquid flame retardant is stored in the flame retardant bag, positioning blocks are installed at both ends of the flame retardant bag, thermal beams clamped with the positioning blocks are installed at both ends of the accommodating cavity, and one end of the thermal beam extends into the mounting hole, a plurality of drainage holes are opened at the lower end of the flame retardant bag, and a harness connected with the positioning blocks is provided at the upper and lower ends of the flame retardant bag, and a plurality of plugs for closing the drainage holes are provided on the harness, and the positioning blocks are connected to the harness through glass balls filled with thermal expansion liquid.

[0009] In the above-mentioned externally protected fireproof cable, the wire core temperature is monitored by an embedded monitoring ring, and external protection is provided by an outer protective sheath. When the wire core is overheated, the outer protective sheath can release liquid flame retardant into the cable to provide flame retardant protection therefor.

[0010] As a further improvement of the present application, auxiliary wires are connected between multiple outer protective covers, the auxiliary wires include data transmission lines, multiple distributed connectors are installed on the data transmission lines, a terminal block matching the distributed connector is provided on the outer protective cover, a temperature sensor matching the thermal conductive column is installed in the outer protective cover, the distributed connector is used to transmit data, an auxiliary bracket is installed on the outer protective cover, and a communication terminal connected to the auxiliary wires is installed on the auxiliary bracket.

[0011] As a further improvement of the present application, the C-shaped shell is made of elastic material, a plurality of guide grooves are provided on the inner wall of the C-shaped shell, and a heat sink is embedded and installed in the guide grooves.

[0012] As a further improvement of the present application, the reinforcing wire includes a heat-conducting wire core, the heat-conducting wire core is bonded to the outer surface of the wire core, and the reinforcing wire is used to monitor the temperature of the wire core.

[0013] As another improvement of the present application, a docking groove matching the docking plug is provided in the middle of the docking socket, and a plurality of liquid-permeable channels surrounding the docking groove are provided on the outside of the docking groove, and the output end of the liquid-permeable channel is located on the outer wall of the embedded column near one end of the reinforcement line.

[0014] As another improvement supplement of the present application, a plurality of pre-cut holes matching the docking socket are provided on the insulating protective layer. The pre-cut holes are distributed in a circle around the outer edge of the docking socket. The insulating protective layer area of ​​the outer protective sleeve is installed, and the partial insulating protective layer is cut along the pre-cut holes.

[0015] As another improvement of the present application, the diameter of the grille holes arranged on the grille clamping plate is larger than the diameter of the plug block, and when the harness is connected to the positioning block, the plug block is inserted into the drainage hole.

[0016] As another improvement of the present application, the accommodating chamber is arranged in multiple and evenly distributed C-shaped shells, and a pressure sensor electrically connected to the terminal block is arranged on the inner wall of the accommodating chamber. When the flame retardant bag is kept filled with liquid in the accommodating chamber, the pressure sensor is subjected to the pressure of the flame retardant bag.

[0017] In summary, the cable is provided with multiple fire protections through monitoring rings, reinforcement wires and outer protective sheaths, the cable temperature is sensed in real time, and flame-retardant tube protection is provided in a timely manner in case of overheating, which has high safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a stereogram of the first and second embodiments of the present application; Figure 2 This is a three-dimensional diagram of the outer protective sleeve of the first and second embodiments of the present application; Figure 3 This is a cross-sectional view of the outer protective sleeve of the first and second embodiments of the present application; Figure 4 for Figure 3 The structural diagram at A in the middle; Figure 5 for Figure 3 The structural diagram at B in the middle; Figure 6 This is a three-dimensional diagram of the flame-retardant bag of the first and second embodiments of the present application; Figure 7 This is a schematic diagram of the connection between the outer protective sleeve and the monitoring system in the second embodiment of the present application.

[0019] Description of the numbers in the figure: 1 wire core body, 11 reinforcement wire, 2 buffer layer, 21 filling layer, 22 embedded column, 23 docking seat, 3 outer protective sleeve, 31 C-type shell, 32 adjustment rod, 33 thermal conductive column, 34 docking plug, 35 thermal conductive beam, 4 auxiliary wire, 5 flame retardant bag, 51 positioning block, 52 wire bundle. DETAILED DESCRIPTION

[0020] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0021] The first implementation method: Figure 1-6 It is shown that an externally protected fireproof cable comprises 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 covered with a plurality of uniformly distributed outer protective sheaths 3; The buffer layer 2 includes a filling layer 21, and a plurality of equally spaced monitoring rings are arranged in the filling layer 21. The detection rings include a plurality of circumferentially distributed embedded columns 22, and a docking seat 23 is arranged on the embedded column 22. The docking seat 23 extends to the outer surface of the filling layer 21, and a docking joint is arranged on the top of the docking seat 23. A plurality of reinforcing wires 11 connected to the embedded columns 22 are passed through the wire core 1; the reinforcing wire 11 includes a heat-conducting wire core, and the heat-conducting wire core is attached to the outer surface of the wire core 1. The reinforcing wire 11 is used to transfer the temperature of the wire core 1 to the plurality of embedded columns 22; The outer protective sleeve 3 includes a C-shaped shell 31, which is provided with a pair of mounting holes, in which a pair of adjusting rods 32 are rotatably connected, and a heat-conducting column 33 is threadedly connected to the adjusting rod 32, and a docking plug 34 matching the docking seat 23 is installed at the top of the heat-conducting column 33. When the adjusting rod 32 rotates, the heat-conducting column 33 moves in a straight line; a flame-retardant bag 5 is placed in the C-shaped shell 31, and liquid flame retardant is stored in the flame-retardant bag 5; a receiving cavity matching the flame-retardant bag 5 is provided in the C-shaped shell 31, and a grille card is clamped at the opening of the receiving cavity; the grille hole aperture set on the grille card is larger than the diameter of the plug block, and when the harness 52 is connected to the positioning block 51, the plug block is clamped into the drainage hole, and the plug block can pass through the grille plate when it is flushed open by the liquid; Positioning blocks 51 are installed at both ends of the flame retardant bag 5, and heat-conducting beams 35 connected to the positioning blocks 51 are installed at both ends of the accommodating cavity, and one end of the heat-conducting beam 35 extends into the mounting hole. A plurality of drainage holes are opened at the lower end of the flame retardant bag 5, and a harness 52 connected to the positioning blocks 51 is provided at both the upper and lower ends of the flame retardant bag 5, and a plurality of plugs for closing the drainage holes are provided on the harness 52, and the positioning block 51 and the harness 52 are connected through a glass ball filled with a thermal expansion liquid; a person skilled in the art selects a suitable type of thermal expansion liquid to fill the glass ball, and the glass ball that is broken under a high temperature state by filling the liquid is a prior art, and the glass ball and the thermal expansion liquid are described in detail in this scheme; The C-shaped shell 31 is made of elastic material, and a plurality of guide grooves are provided on the inner wall of the C-shaped shell 31, and a heat sink is embedded and installed in the guide groove; the C-shaped shell 31 of this solution is made of elastic material, which is convenient and quick to install, and the plurality of guide grooves and heat sink provided on the inner wall help to quickly dissipate heat; When the flame retardant bag 5 is installed, the installation can be completed by clamping the positioning block 51 with the heat conducting beam 35, which makes the replacement and maintenance of the flame retardant bag 5 simple and convenient, and reduces the maintenance cost.

[0022] A plurality of heat exchange fins are connected between the heat conduction beam 35 and the heat conduction column 33. Through holes matching the heat conduction column are provided on the plurality of heat exchange fins. The heat conduction column 33 is disposed between the plurality of heat exchange fins. The heat of the wire core is transferred to the heat conducting column 33, the docking plug 34, the embedded column 22 and the docking seat 23. At the heat conducting beam 35, the heat expansion liquid in the glass ball expands due to heat; when the temperature is too high, the glass ball expands and is broken by the expansion liquid, thereby disconnecting the cable bundle 52 from the positioning block 51, and the external supporting force of the plug block is released. At this time, the liquid flame retardant in the flame retardant bag 5 is discharged from the drainage hole, and then the liquid flame retardant is released through the grid plate onto the insulating protective layer, thereby realizing external flame retardant protection of the cable; A docking groove matching with the docking plug 34 is provided in the middle of the docking seat 23 , and a plurality of liquid permeable channels surrounding the docking groove are provided outside the docking groove. The output end of the liquid permeable channel is located on the outer wall of the embedded column 22 near the reinforcing line 11 .

[0023] When the liquid flame retardant is close to the docking seat 23, the flame retardant penetrates into the filling layer 21 through the liquid permeable channel, so that the flame retardant is added into the cable to provide internal flame retardant protection for the cable.

[0024] Compared with the existing cables, the present embodiment not only has external flame retardant protection through the design of the outer protective sheath 3, but also when the internal temperature of the cable is too high, the internal flame retardant bag 5 will release liquid flame retardant to the inside and outside of the cable when the wire core is overheated, further improving the fire resistance of the cable.

[0025] A plurality of monitoring rings and a reinforcing wire 11 are also arranged in the cable to sense the temperature change of the wire core 1 in real time, and the heat of the wire core is transferred to the outer protective sheath 3 through the heat-conducting column 33, the docking plug 34, the embedded column 22 and the docking seat 23. On the one hand, it is convenient to rupture the positioning block 51 of the flame retardant bag 5 to release the flame retardant when the wire core is overheated; on the other hand, it is convenient to install a temperature sensor in the outer protective sheath 3 to collect the temperature data of the wire core 1. This design enables the cable to respond quickly to temperature changes and automatically release the flame retardant when necessary, thereby improving the safety of the cable.

[0026] Second implementation method: Figure 2-7 As shown, the insulating protective layer is provided with a plurality of pre-cut holes matching the docking socket 23, and the pre-cut holes are distributed in a circle around the outer edge of the docking socket 23. The insulating protective layer area of ​​the outer protective sleeve 3 is installed, and the local insulating protective layer is cut along the pre-cut holes; optionally, a protective film is laid on the pre-cut holes to close the pre-cut holes according to the use environment, so as to prevent external contaminants from penetrating into the cable.

[0027] In the initial state of the insulating protective layer of this solution, the area on its surface corresponding to the docking seat 23 is provided with pre-cut holes distributed in a ring along the docking seat 23. On the one hand, it is convenient to locate the position of the docking seat 23 through the pre-cut holes, and on the other hand, it is convenient for the heat dissipation of the wire core 1; An auxiliary conductor 4 is connected between the multiple outer protective sleeves 3, and the auxiliary conductor 4 includes a data transmission line 41, and multiple distributed connectors 42 are installed on the data transmission line 41. A terminal block matching the distributed connector 42 is provided on the outer protective sleeve 3, and a temperature sensor matching the heat-conducting column 33 is installed in the outer protective sleeve 3. The distributed connector 42 is used to transmit data. An auxiliary bracket is installed on the outer protective sleeve 3, and a communication terminal connected to the auxiliary conductor 4 is installed on the auxiliary bracket; the communication terminal is connected to the external monitoring system signal; The accommodating cavity is set in a plurality of evenly distributed C-shaped shells 31, and a pressure sensor electrically connected to the wiring seat is set on the inner wall of the accommodating cavity. When the flame retardant bag 5 is kept in a liquid-filled state in the accommodating cavity, the pressure sensor is subjected to the pressure of the flame retardant bag 5; When the value collected by the temperature sensor is higher than the set value, it is judged that the core temperature is too high, and the monitoring system alarms; when the pressure value detected by the pressure sensor is lower than the set value, it means that the flame retardant in the flame retardant bag 5 is released or leaked, and the monitoring system alarms; When installing the outer protective sleeve 3 of the present solution, the pre-cut hole is firstly cut to cut off the insulating protective layer at the docking seat 23, and the outer protective sleeve 3 is directly clamped on the cable, and then the angle of the outer protective sleeve 3 is adjusted to match the position of the docking seat 23 and the docking plug 34; and then the adjustment rod 32 is rotated to insert the heat conducting column 33 into the docking seat 23 until the docking plug 34 docks with the docking seat 23, so as to complete the installation and positioning of the outer protective sleeve 3; Then, select an auxiliary bracket for installing the outer protective cover 3 at a suitable position, and install the auxiliary wire 4 between multiple outer protective covers 3. When installing the auxiliary wire 4, dock the distributed connector 42 with the terminal block to complete the installation. Finally, connect the auxiliary wire 4 to the communication terminal on the auxiliary bracket to complete the connection between the outer protective cover 3 and the external monitoring system.

[0028] This embodiment not only facilitates the positioning of the docking seat 23 and improves installation efficiency by opening pre-cut holes on the insulating protective layer, but also provides a heat dissipation channel for the wire core 1, which helps the cable maintain stable performance in a high temperature environment.

[0029] The present solution also realizes real-time monitoring of the internal state of the outer protective sheath 3 through the auxiliary wire 4 and the data transmission wire 41 and distributed connector 42 thereon. This includes not only the monitoring of the wire core temperature by the temperature sensor, but also the monitoring of the flame retardant state in the flame retardant bag 5 by the pressure sensor; this real-time data transmission provides a strong guarantee for the safe operation of the cable.

[0030] When the values ​​collected by the temperature sensor or pressure sensor are detected to be abnormal, the system will immediately issue an alarm to remind staff to deal with potential safety hazards in a timely manner.

[0031] In summary, this solution provides multiple fire protections for the cable through the monitoring ring, the reinforcement wire 11 and the outer protective sheath 3, senses the temperature of the cable in real time, and responds promptly to flame retardant tube protection when overheating, which has high safety and reliability.

[0032] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An externally protected fireproof cable, comprising a core (1), characterized in that: The outer end of the wire core (1) is fixedly connected to 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 covered with a plurality of evenly distributed outer protective sleeves (3); The buffer layer (2) comprises a filling layer (21), a plurality of equally spaced monitoring rings are arranged in the filling layer (21), the detection rings comprise a plurality of circumferentially distributed embedded columns (22), a docking seat (23) is arranged on the embedded columns (22), the docking seat (23) extends to the outer surface of the filling layer (21), a docking joint is arranged at the top of the docking seat (23), and a plurality of reinforcing wires (11) connected to the embedded columns (22) are passed through the wire core (1); The outer protective sleeve (3) comprises a C-shaped shell (31), the C-shaped shell (31) is provided with a pair of mounting holes, 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 docking plug (34) matching the docking seat (23) is installed at the top of the heat-conducting column (33); a flame-retardant bag (5) is placed in the C-shaped shell (31), a receiving cavity matching the flame-retardant bag (5) is provided in the C-shaped shell (31), and a grille clamping plate is clamped at the opening of the receiving cavity; The flame retardant bag (5) stores liquid flame retardant, and positioning blocks (51) are installed at both ends of the flame retardant bag (5). Heat-conducting beams (35) that are clamped with the positioning blocks (51) are installed at both ends of the accommodating cavity, and one end of the heat-conducting beam (35) extends into the mounting hole. A plurality of drainage holes are opened at the lower end of the flame retardant bag (5), and a harness (52) connected to the positioning blocks (51) is provided at both upper and lower ends of the flame retardant bag (5), and a plurality of plugs for closing the drainage holes are provided on the harness (52), and the positioning blocks (51) and the harness (52) are connected via glass balls filled with thermal expansion liquid.

2. The externally protected fireproof cable according to claim 1, characterized in that: An auxiliary conductor (4) is connected between the plurality of outer protective sleeves (3), the auxiliary conductor (4) comprising a data transmission line (41), a plurality of distributed connectors (42) being installed on the data transmission line (41), a terminal block matching the distributed connectors (42) being provided on the outer protective sleeve (3), a temperature sensor matching the heat-conducting column (33) being installed in the outer protective sleeve (3), the distributed connector (42) being used for transmitting data, an auxiliary bracket being installed on the outer protective sleeve (3), and a communication terminal connected to the auxiliary conductor (4) being installed on the auxiliary bracket.

3. The externally protected fireproof cable according to claim 1, characterized in that: The C-shaped shell (31) is made of an elastic material, and a plurality of guide grooves are provided on the inner wall of the C-shaped shell (31), wherein a heat dissipation plate is embedded and installed in the guide grooves.

4. The externally protected fireproof cable according to claim 1, characterized in that: The reinforcing wire (11) comprises a heat-conducting wire core, the heat-conducting wire core is bonded to the outer surface of the wire core (1), and the reinforcing wire (11) is used to transfer the temperature of the wire core (1) to a plurality of embedded columns (22).

5. The externally protected fireproof cable according to claim 1, characterized in that: A docking groove matching the docking plug (34) is provided in the middle of the docking seat (23), and a plurality of liquid-permeable channels surrounding the docking groove are provided outside the docking groove, wherein the output ends of the liquid-permeable channels are located on the outer wall of the embedded column (22) close to one end of the reinforcement line (11).

6. The externally protected fireproof cable according to claim 1, characterized in that: The insulating protective layer is provided with a plurality of pre-cut holes matching the docking seat (23), the pre-cut holes being distributed in a circle around the outer edge of the docking seat (23), and the insulating protective layer area where the outer protective sleeve (3) is installed is partially cut off along the pre-cut holes.

7. The externally protected fireproof cable according to claim 1, characterized in that: The diameter of the grid holes arranged on the grid clamping plate is larger than the diameter of the plug block, and when the harness (52) is connected to the positioning block (51), the plug block is inserted into the drainage hole.

8. The externally protected fireproof cable according to claim 2, characterized in that: The accommodating cavity is arranged in a plurality of evenly distributed C-shaped shells (31), and a pressure sensor electrically connected to a wiring socket is arranged on the inner wall of the accommodating cavity. When the flame retardant bag (5) is kept filled with liquid in the accommodating cavity, the pressure sensor is subjected to the pressure of the flame retardant bag (5).

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