A fire-resistant multi-core control cable

Abstract

The present invention relates to a fire-resistant multi-core control type cable applied in the field of cables, comprising a multi-core cable body, wherein a plurality of insulating cores are arranged in the multi-core cable body, and the cooperation of the above-mentioned inner heat shrink component, outer heat shrink component and outer support sleeve is adopted, when any insulating core in the multi-core cable body is locally ignited due to overheating or external factors, the inner shrink sleeve and the outer shrink sleeve will be separated under the heat shrinkage of the heat shrink package and the heat shrink strip, and an isolation belt is formed on the outside of the insulating core, which has good fire resistance and isolation and retardation effects, can effectively prevent the spread of fire and the influence on other insulating cores, protect the multi-core cable body itself, and also strive for effective emergency time for the signal control terminal connected to the multi-core cable body, effectively avoid the expansion of the fire range, reduce the damaged and affected range, thereby reducing the subsequent maintenance cost, and promoting the economic benefits of the application of the multi-core cable body.

Description

Technical Field

[0001] The invention relates to a multi-core control type cable, in particular to a fire-resistant multi-core control type cable used in the cable field. Background Art

[0002] Multi-core control cable is a cable with multiple insulated cores. It is mainly used to connect electrical control equipment and instruments. It is suitable for occasions where multiple control lines are required. For example, in automated machinery or power distribution systems, multi-core cables can be used to connect from the control panel to various sensors and actuators.

[0003] Multi-core control cables are composed of two or more insulated cores, commonly two-core, three-core, four-core, etc., up to 61 cores, usually including conductors, insulation, sheaths and possible shielding layers. The conductor material is mainly copper to ensure good conductivity and anti-interference. Multi-core control cables are an indispensable part of modern electrical control systems. Their diverse designs and wide applications make them the key to achieving efficient and reliable electrical connections.

[0004] However, the isolation between the multiple insulated cores of the multi-core control cable in the prior art is poor. When a single insulated core is damaged by fire, it will quickly affect the other insulated cores and cannot play an effective isolation or relief role. It is very easy to cause damage to the multi-core control cable as a whole and the terminal, increasing the maintenance cost, which is not conducive to the economic benefits of the application of multi-core control cables. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to increase the fire-resistant isolation between multiple insulating cores in a multi-core control cable to ensure its safety in subsequent applications.

[0006] In order to solve the above problems, the present invention provides a fire-resistant multi-core control cable, comprising a multi-core cable body, wherein a plurality of insulating cores are arranged in the multi-core cable body, a heat-shrinkable outer component is fixedly sleeved at the outer end of the insulating core, a heat-shrinkable inner component is sleeved at the outer end of the heat-shrinkable outer component, and an outer support sleeve is fixedly sleeved at the outer end of the heat-shrinkable inner component;

[0007] The heat shrinkable inner assembly comprises an inner shrinkable sleeve fixedly connected to the inner wall of the outer support sleeve, an isolation shrinkable cavity is provided in the inner shrinkable sleeve, and a plurality of evenly distributed heat shrinkable bags are fixedly connected in the isolation shrinkable cavity;

[0008] The heat shrink assembly comprises an outer shrink sleeve fixedly connected to the outer end of the multi-core cable body, a separation cavity is provided in the outer shrink sleeve, and a plurality of evenly distributed heat shrink strips are fixedly connected in the separation cavity.

[0009] In the above-mentioned fire-resistant multi-core control cable, when any insulated core in the multi-core cable body catches fire locally due to overheating or external factors, the inner shrink sleeve and the outer shrink sleeve will separate under the heat shrinkage of the heat shrink bag and the heat shrink strip, forming an isolation belt on the outside of the insulated core, which has good fire resistance and isolation and retardation effects.

[0010] As a supplement to the present application, the inner wall of the inner shrink sleeve and the outer end of the outer shrink sleeve are fixedly connected by hot melt adhesive, and the heat shrink package and the heat shrink strip both produce deformation along the radial direction of the multi-core cable body when heated.

[0011] As a supplement to the present application, the heat shrink bag and the heat shrink strip are both made of polymer shape memory material.

[0012] As a further improvement of the present application, the outer end of the multi-core cable body is provided with a sheath layer wrapped around the outside of the multiple insulating cores, and the sheath layer is filled with a core isolation filler that matches the outer support sleeve.

[0013] As a further improvement of the present application, a plurality of evenly distributed breakthrough cone spikes are fixedly connected to the inner wall of the separation cavity close to the insulating wire core, and the tip of the breakthrough cone spike is arranged toward the side away from the insulating wire core, a cone spike cavity is opened inside the breakthrough cone spike, and a plurality of release holes connected to the cone spike cavity are opened at both inner and outer ends of the breakthrough cone spike.

[0014] As a further improvement of the present application, the partition cavity is filled with an inert insulating filler, and the inert insulating filler is an unsaturated filling.

[0015] As a further improvement of the present application, a plurality of conductive plates are embedded in the inner wall of the inner shrink sleeve, and a plurality of trigger plates matching with the conductive plates are embedded in the outer end of the outer shrink sleeve. The trigger plates and the conductive plates constitute an induction switch, and the output end of the induction switch is connected to a communication monitoring unit mounted in the signal control end of the multi-core cable body.

[0016] As another improvement of the present application, the output end of the communication monitoring unit is connected to the cable monitoring processing unit carried in the signal control end of the multi-core cable body, the output end of the cable monitoring processing unit is connected to the cut-off protection unit and the alarm unit, the output end of the cut-off protection unit is connected to the multi-core cable body signal, and the output end of the alarm unit is connected to the alarm.

[0017] In summary, through the cooperation of the inner heat shrink component, the outer heat shrink component and the outer support sleeve, when any insulating core in the multi-core cable body is locally on fire due to overheating or external factors, the inner shrink sleeve and the outer shrink sleeve will be separated under the heat shrinkage of the heat shrink bag and the heat shrink strip, forming an isolation belt on the outside of the insulating core, which has good fire resistance and isolation and retardation effects, can effectively prevent the spread of fire and the impact on other insulating cores, protect the multi-core cable body itself, and also strive for effective emergency time for the signal control end connected to the multi-core cable body, effectively avoid the expansion of the fire range, reduce the damage and affected range, thereby reducing the subsequent maintenance cost, and promoting the economic benefits of the application of the multi-core cable body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an axonometric view of the multi-core cable body in a normal state in the first to third embodiments of the present application;

[0019] Figure 2 This is an axonometric diagram of the multi-core cable body in the local fire state of the first to third embodiments of the present application;

[0020] Figure 3 This is a front cross-sectional view of the multi-core cable body in a normal state of the first and third embodiments of the present application;

[0021] Figure 4 This is a cross-sectional view of a single insulated wire core in a normal state in the first and third embodiments of the present application, in cooperation with a heat-inner shrink component and a heat-outer shrink component;

[0022] Figure 5 This is a front cross-sectional view of a multi-core cable body in a local fire state in the first and third embodiments of the present application;

[0023] Figure 6 It is a cross-sectional view of a single insulated wire core in cooperation with a heat inner shrink component and a heat outer shrink component in a local fire state in the first and third embodiments of the present application;

[0024] Figure 7 This is a front cross-sectional view of the multi-core cable body in a normal state of the second and third embodiments of the present application;

[0025] Figure 8 This is a cross-sectional view of a single insulated wire core in a normal state in the second and third embodiments of the present application, in cooperation with a heat-inner shrink component and a heat-outer shrink component;

[0026] Fig. 9 It is a cross-sectional view of the cooperation between the breakthrough cone thorn and the outer shrink sleeve in the normal state of the second and third embodiments of the present application;

[0027] Fig.10This is a front cross-sectional view of a multi-core cable body in a local fire state according to the second and third embodiments of the present application;

[0028] Fig.11 It is a cross-sectional view of a single insulated wire core in cooperation with a heat inner shrink component and a heat outer shrink component in a local fire state in the second and third embodiments of the present application;

[0029] Fig.12 It is a cross-sectional view of the cooperation between the breakthrough cone thorn and the outer shrink sleeve in the local fire state of the second and third embodiments of the present application;

[0030] Fig.13 This is a logic diagram of the inductive switch operation according to the third embodiment of the present application.

[0031] Description of the numbers in the figure:

[0032] 1 multi-core cable body, 11 insulating core, 12 core isolation filler, 2 inner heat shrink assembly, 21 inner shrink sleeve, 22 isolation shrink cavity, 23 heat shrink bag, 3 outer heat shrink assembly, 31 outer shrink sleeve, 32 separation cavity, 33 heat shrink strip, 4 outer support sleeve, 5 breakthrough cone thorn, 51 cone thorn cavity, 52 release hole, 6 inert insulating filler. DETAILED DESCRIPTION

[0033] The following is a detailed description of three implementation methods of the present application in conjunction with the accompanying drawings.

[0034] The first implementation method:

[0035] Figure 1-6 A fire-resistant multi-core control cable is shown, which comprises a multi-core cable body 1, in which a plurality of insulating cores 11 are arranged, the outer ends of the insulating cores 11 are fixedly sleeved with a heat outer shrink component 3, the outer ends of the heat outer shrink component 3 are sleeved with a heat inner shrink component 2, and the outer ends of the heat inner shrink component 2 are fixedly sleeved with an outer support sleeve 4;

[0036] The heat shrinkable inner assembly 2 comprises an inner shrinkable sleeve 21 fixedly connected to the inner wall of the outer support sleeve 4, an isolation shrinkable cavity 22 is provided in the inner shrinkable sleeve 21, and a plurality of evenly distributed heat shrinkable bags 23 are fixedly connected in the isolation shrinkable cavity 22;

[0037] The heat shrinkable outer component 3 includes an outer shrink sleeve 31 fixedly connected to the outer end of the multi-core cable body 1, a separation chamber 32 is provided in the outer shrink sleeve 31, and a plurality of evenly distributed heat shrink strips 33 are fixedly connected in the separation chamber 32. Through the cooperation of the heat shrinkable inner component 2, the heat shrinkable outer component 3 and the outer support sleeve 4, when any insulating core 11 in the multi-core cable body 1 is locally ignited due to overheating or external factors, the inner shrink sleeve 21 and the outer shrink sleeve 31 will be separated under the heat shrinkage of the heat shrinkable package 23 and the heat shrink strip 33, forming an isolation belt on the outside of the insulating core 11, which has good fire resistance and isolation and retardation effects, can effectively prevent the spread of fire and the impact on other insulating cores 11, protect the multi-core cable body 1 itself, and also strive for effective emergency time for the signal control end connected to the multi-core cable body 1, effectively avoid the expansion of the fire range, reduce the damaged and affected range, thereby reducing the subsequent maintenance cost, and promoting the economic benefits of the application of the multi-core cable body 1.

[0038] Figure 3-6 It is shown that the inner wall of the inner shrink sleeve 21 and the outer end of the outer shrink sleeve 31 are fixedly connected by hot melt adhesive, and the heat shrink bag 23 and the heat shrink strip 33 are deformed along the radial direction of the multi-core cable body 1 when heated. Under normal conditions, the inner shrink sleeve 21 and the outer shrink sleeve 31 hinged by the hot melt adhesive can ensure the support and protection effect of the insulating core 11, reduce the performance damage of the insulating core 11 caused by the multi-core cable body 1 during the laying process or when it is subjected to external forces, effectively extend the service life of the multi-core cable body 1, and can automatically melt and fail in a high-temperature environment caused by factors such as fire, promote the heat shrinkage separation effect of the inner shrink sleeve 21 and the outer shrink sleeve 31, reduce the influence of high temperature on the insulating core 11, and prevent the radial spread of fire.

[0039] Figure 1-6 It is shown that the heat shrink bag 23 and the heat shrink strip 33 are both made of polymer shape memory material. The setting of the polymer shape memory material can not only ensure the flexibility of the multi-core cable body 1, but also produce thermal shrinkage deformation after being affected by temperature, thereby achieving the effect of isolating and slowing down the temperature and fire, and effectively increasing the fire resistance of the multi-core cable body 1.

[0040] Figure 1-6 It is shown that the outer end of the multi-core cable body 1 is provided with a sheath layer wrapped around the outside of multiple insulating cores 11, and the sheath layer is filled with core isolation filler 12 that matches the outer support sleeve 4. The setting of the core isolation filler 12 can increase the isolation effect between the multiple insulating cores 11, further reduce the mutual influence between the multiple insulating cores 11, and ensure the application performance of the multi-core cable body 1.

[0041] Figure 1-6It is shown that during the application of the multi-core cable body 1, when a local fire occurs in the multi-core cable body 1 and a single insulated core 11 due to an open flame outside or local overheating of the insulated core 11, the temperature conduction will be continuously absorbed through the outer support sleeve 4, the inner shrink sleeve 21 and the outer shrink sleeve 31. The continuous increase in temperature will first melt the hot melt adhesive between the inner shrink sleeve 21 and the outer shrink sleeve 31 and make it ineffective. Then, after the temperature reaches the thermal shrinkage deformation of the heat shrink bag 23 and the heat shrink strip 33, the heat shrink bag 23 will produce radial contraction toward the side close to the outer support sleeve 4, and the heat shrink strip 33 will produce radial contraction toward the side of the insulated core 11, thereby driving the inner shrink sleeve 21 and the outer shrink sleeve 31 to produce opposite contractions. The multi-core cable body 1 is deformed and gradually forms a hollow isolation zone during its contraction process, which can reduce the efficiency of temperature conduction and reduce the damage to the insulating core 11 caused by continuous high temperature on the one hand, and on the other hand, it can also effectively block and suppress the radial spread of fire in the hollow isolation zone, avoid the rapid spread of fire and damage to the remaining insulating cores 11, and buy time for regulation for the signal control end of the multi-core cable body 1. While reducing the continuous damage to the multi-core cable body 1, it can effectively avoid damage to other terminal devices connected to the multi-core cable body 1, reduce maintenance costs, effectively increase the fire resistance of the multi-core cable body 1, and promote the economic benefits of the multi-core cable body 1 during application.

[0042] Second implementation method:

[0043] Figure 1 , Figure 2 and Figure 7 - Fig.12 A fire-resistant multi-core control cable is shown, in which a plurality of evenly distributed breakthrough cone spikes 5 are fixedly connected to the inner wall of a separation cavity 32 close to the insulating core 11, and the tip of the breakthrough cone spike 5 is arranged toward the side away from the insulating core 11, a cone spike cavity 51 is provided in the breakthrough cone spike 5, and a plurality of release holes 52 connected to the cone spike cavity 51 are provided at both inner and outer ends of the breakthrough cone spike 5. The setting of the breakthrough cone spike 5 can puncture the inner shrink sleeve 21 when the inner shrink sleeve 21 is driven by the heat shrink bag 23 to produce a shrinking action, connect the inner shrink sleeve 21 and the isolation belt produced by the separation of the inner shrink sleeve 21 and the outer shrink sleeve 31, and can effectively release the gas inside the inner shrink sleeve 21, which can further suppress the fire and further improve the fire resistance of the multi-core cable body 1.

[0044] Figure 1 , Figure 2 and Figure 7 - Fig.12It is shown that the partition cavity 32 is filled with an inert insulating filler 6, and the inert insulating filler 6 is an unsaturated filling. The inert insulating filler 6 can be an inert gas such as helium, neon and argon, with helium being the most preferred. The setting of the inert insulating filler 6 can have a flame retardant barrier effect, suppress the radial spread of the fire by diluting the oxygen concentration, and reduce the damage to the multi-core cable body 1.

[0045] Figure 1 , Figure 2 and Figure 7 - Fig.12 It is shown that when the outer shrink sleeve 31 is driven by the heat shrink strip 33 to produce heat shrinkage deformation close to the insulated core 11, the outer shrink sleeve 31 continues to shrink, which will cause the tip of the breakthrough cone thorn 5 to puncture the outer shrink sleeve 31. After the tip of the breakthrough cone thorn 5 extends to the outside of the outer shrink sleeve 31, under the action of the shrinkage pressure of the outer shrink sleeve 31, the inert insulating filler 6 flows into the cone thorn cavity 51 through the release hole 52 at the inner end of the breakthrough cone thorn 5, and then flows out through the release hole 52 at the outer end of the breakthrough cone thorn 5, continuously filling the isolation zone generated by the separation of the inner shrink sleeve 21 and the outer shrink sleeve 31, and forming a flame retardant zone through the inert insulating filler 6, further avoiding the radial spread of fire, and improving the fire resistance of the multi-core cable body 1.

[0046] The third implementation method:

[0047] Figure 1 - Fig.13 A fire-resistant multi-core control cable is shown, wherein a plurality of conductive sheets are embedded in the inner wall of the inner shrink sleeve 21, and a plurality of trigger sheets cooperating with the conductive sheets are embedded in the outer end of the outer shrink sleeve 31. The trigger sheets and the conductive sheets constitute an induction switch, and the output end of the induction switch is connected to a communication monitoring unit mounted in the signal control end of the multi-core cable body 1. The arrangement of the induction switch and the communication monitoring unit can generate a monitoring signal indicating a signal disconnection when a local fire occurs in the multi-core cable body 1, thereby facilitating data monitoring of the application status of the multi-core cable body 1 and promoting the intelligent development of the multi-core cable body 1.

[0048] Fig.13 The output end of the communication monitoring unit is shown to be connected to the cable monitoring processing unit carried in the signal control end of the multi-core cable body 1. The output end of the cable monitoring processing unit is connected to the cut-off protection unit and the alarm unit. The output end of the cut-off protection unit is connected to the signal of the multi-core cable body 1, and the output end of the alarm unit is connected to an alarm. The arrangement of the cable monitoring processing unit and the cut-off protection unit can not only cooperate with the communication monitoring unit to realize the intelligent monitoring function of the multi-core cable body 1, but also can control the multi-core cable body 1, thereby protecting the multi-core cable body 1 and the signal control end connected thereto, thereby effectively reducing the economic losses caused by the abnormality of the multi-core cable body 1.

[0049] It should be noted that the signal control end of the multi-core cable body 1 is an electrical control device connected to the multi-core cable body 1. A processor is arranged in the electrical control device. The communication monitoring unit, the cable monitoring processing unit, the cut-off protection unit and the alarm unit are all control units mounted on the processor, which are used to monitor and protect the application status of the multi-core cable body 1. When the electrical control device is connected to multiple sensors, actuators and other instruments through the multi-core cable body 1, the fire of a single insulating core 11 in the multi-core cable body 1 will cause mutual influence between it and the insulating core 11. Therefore, the cable monitoring processing unit can timely monitor the status of multiple insulating cores 11 in the multi-core cable body 1 through the cooperation of the communication monitoring unit and the induction switch. After the disconnection signal of a single insulating core 11 appears, the sensors, actuators and other instruments connected to it through the insulating core 11 in the multi-core cable body 1 can be timely cut off or other conduction protection can be performed to avoid communication damage caused by the spread of fire or temperature.

[0050] Figure 1 - Fig.13 It is shown that after the high temperature generated by the fire causes the inner shrink sleeve 21 and the separation chamber 32 to produce a heat shrinkage separation action, the conductive sheet and the trigger sheet embedded and matched with each other thereon are separated along with the shrinkage action, causing the induction switch they constitute to be disconnected, and then a disconnection signal is transmitted to the communication monitoring unit, and the communication monitoring unit transmits the disconnection signal to the cable monitoring processing unit. The cable monitoring processing unit determines the food status of the multi-core cable body 1 at this time according to the data volume of the disconnection signal, and makes a timely emergency response. While sending an abnormal signal to the alarm unit, so that the alarm unit controls the alarm to start and reminds relevant personnel to pay attention, it also sends a cut-off instruction to the cut-off protection unit to cut off the communication transmission function of each insulated core 11 in the multi-core cable body 1 that generates the disconnection signal at this time, thereby avoiding the adverse effects caused by the sudden disconnection of subsequent communications, reducing the damage caused by local fire of the multi-core cable body 1 and a single insulated core 11, and effectively improving the intelligence and safety of the multi-core cable body 1 during application, and achieving the effect of autonomous monitoring and autonomous protection.

[0051] 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. A fire-resistant multi-core control cable, characterized in that: The invention comprises a multi-core cable body (1), wherein a plurality of insulating wire cores (11) are arranged in the multi-core cable body (1), the outer ends of the insulating wire cores (11) are fixedly sleeved with a heat-shrinkable outer component (3), the outer ends of the heat-shrinkable outer component (3) are sleeved with a heat-shrinkable inner component (2), and the outer ends of the heat-shrinkable inner component (2) are fixedly sleeved with an outer support sleeve (4); The heat shrinkable inner component (2) comprises an inner shrinkable sleeve (21) fixedly connected to the inner wall of the outer support sleeve (4), an isolation shrinkable cavity (22) is provided in the inner shrinkable sleeve (21), and a plurality of evenly distributed heat shrinkable bags (23) are fixedly connected in the isolation shrinkable cavity (22); The heat shrinkable outer component (3) comprises an outer shrink sleeve (31) fixedly connected to the outer end of the multi-core cable body (1), a partition cavity (32) is provided in the outer shrink sleeve (31), and a plurality of evenly distributed heat shrink strips (33) are fixedly connected in the partition cavity (32); The inner wall of the inner shrink sleeve (21) and the outer end of the outer shrink sleeve (31) are fixedly connected by hot melt adhesive, and the heat shrink package (23) and the heat shrink strip (33) both produce a deformation effect along the radial direction of the multi-core cable body (1) when heated.

2. A fire-resistant multi-core control cable according to claim 1, characterized in that: The outer end of the multi-core cable body (1) is provided with a sheath layer wrapped around the outside of a plurality of insulating wire cores (11), and the sheath layer is filled with a wire core isolation filler (12) that matches the outer support sleeve (4).

3. A fire-resistant multi-core control cable according to claim 1, characterized in that: A plurality of evenly distributed breakthrough cone spikes (5) are fixedly connected to the inner wall of the separation cavity (32) on the side close to the insulating wire core (11), and the tip of the breakthrough cone spike (5) is arranged toward the side away from the insulating wire core (11). A cone spike cavity (51) is provided in the breakthrough cone spike (5), and a plurality of release holes (52) connected to the cone spike cavity (51) are provided at both inner and outer ends of the breakthrough cone spike (5).

4. A fire-resistant multi-core control cable according to claim 3, characterized in that: The partition cavity (32) is filled with an inert insulating filler (6), and the inert insulating filler (6) is unsaturated filling.

5. A fire-resistant multi-core control cable according to claim 1, characterized in that: The heat shrink bag (23) and the heat shrink strip (33) are both made of polymer shape memory material.

6. A fire-resistant multi-core control cable according to claim 1, characterized in that: The inner wall of the inner shrink sleeve (21) is embedded with a plurality of conductive sheets, and the outer end of the outer shrink sleeve (31) is embedded with a plurality of trigger sheets that cooperate with the conductive sheets. The trigger sheets and the conductive sheets form an inductive switch, and the output end of the inductive switch is connected to a communication monitoring unit mounted in the signal control end of the multi-core cable body (1).

7. A fire-resistant multi-core control cable according to claim 6, characterized in that: The output end of the communication monitoring unit is connected to a cable monitoring processing unit mounted in the signal control end of the multi-core cable body (1); the output end of the cable monitoring processing unit is connected to a cut-off protection unit and an alarm unit; the output end of the cut-off protection unit is signal-connected to the multi-core cable body (1); and the output end of the alarm unit is connected to an alarm.

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